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WO2021145366A1 - Sound-absorbing heat-shielding cover and engine unit - Google Patents

Sound-absorbing heat-shielding cover and engine unit Download PDF

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Publication number
WO2021145366A1
WO2021145366A1 PCT/JP2021/001002 JP2021001002W WO2021145366A1 WO 2021145366 A1 WO2021145366 A1 WO 2021145366A1 JP 2021001002 W JP2021001002 W JP 2021001002W WO 2021145366 A1 WO2021145366 A1 WO 2021145366A1
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WO
WIPO (PCT)
Prior art keywords
metal plate
heat insulating
sound absorbing
insulating cover
heat
Prior art date
Application number
PCT/JP2021/001002
Other languages
French (fr)
Japanese (ja)
Inventor
哲矢 笹川
元太郎 山崎
Original Assignee
ニチアス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ニチアス株式会社 filed Critical ニチアス株式会社
Publication of WO2021145366A1 publication Critical patent/WO2021145366A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08—Insulating elements, e.g. for sound insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • F02B77/13—Acoustic insulation
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G10K11/168—Plural layers of different materials, e.g. sandwiches

Definitions

  • the present invention relates to a sound absorbing and heat insulating cover and an engine unit.
  • the above-mentioned automobile noise is generated from the engine room because it is a sum of not only the noise generated from the drive system engine room such as the engine, the motor, and the transmission, but also the exhaust noise, the wind noise, the tire road noise, and the like. If the above target is to be achieved only by reducing noise, it is necessary to reduce noise by 5 to 6 dB in the engine room and 1/4 as sound pressure energy. It is becoming difficult to deal with it.
  • soundproofing material is applied to almost the entire engine, that is, almost the entire surface of the engine wall surface, upper surface (bonnet) side, and lower surface (underbody) side, and the entire engine serving as a sound source is used. It is conceivable to use (near) engine encapsulation, which is covered with a soundproofing material to suppress noise leakage to the outside of the vehicle and at the same time reduce the noise level in the engine room by its sound absorbing effect.
  • the thickness prepared for the soundproof material is about 10 to 20 mm even when the above encapsulation is performed.
  • the noise on the relatively low frequency side of 1 kHz or less depends on the thickness and mass of the soundproof material, so the effect obtained. Will be very limited.
  • the soundproofing material cannot exhibit sufficient sound absorption performance, a large reverberant sound will be heard in the engine room, and if the sound insulation performance is not sufficient, the energy that cannot be attenuated will vibrate the wall surface, top surface, and bottom surface of the engine room. Even louder noise may be generated.
  • the exhaust side wall surface and the upper surface of the engine reach a temperature of about 200 to 230 ° C., and are provided outside the engine body by the high temperature exhaust heat. Resin parts and electrical parts may be damaged.
  • the present invention can be used as a soundproofing cover for an automobile engine, and has a novel sound absorbing and heat insulating cover having sufficient soundproofing performance and excellent heat resistance and heat insulating properties, and an engine having such a sound absorbing and heat insulating cover.
  • the purpose is to provide a unit.
  • the present inventors have provided a soundproof metal plate for absorbing noise in the engine room on the engine, and then the engine parts due to the high temperature exhaust heat are provided on the soundproof metal plate.
  • the idea was to provide a heat-shielding metal plate to prevent damage to the engine.
  • the soundproof metal plate and the heat shield metal plate are sequentially placed on the engine, the sound reverberating in the engine room is also reflected by the heat shield metal plate. It has been found that the soundproofing effect (sound absorbing effect) of the soundproofing metal plate is remarkably reduced, and that sufficient heat insulating properties cannot always be exhibited.
  • a soundproof metal plate having a plurality of through holes on the surface, an inorganic fiber mat, and a heat shield metal plate having a plurality of through holes on the surface are obtained.
  • the above technical problems can be solved by a sound absorbing and heat insulating cover laminated in order, wherein the opening area of each through hole provided in the soundproof metal plate is 0.01 to 7.1 mm 2. Based on this finding, the present invention has been completed.
  • the present invention (1) A sound absorbing and heat insulating cover in which a soundproof metal plate having a plurality of through holes on the surface, an inorganic fiber mat, and a heat insulating metal plate having a plurality of through holes on the surface are laminated in this order.
  • a sound absorbing and heat insulating cover characterized in that the opening area of each through hole provided in the soundproof metal plate is 0.01 to 7.1 mm 2.
  • a soundproof metal plate, an inorganic fiber mat, and a heat shield metal plate are sequentially laminated as a sound absorption and heat shield cover on a covering object, and the soundproof metal plate and the heat shield metal are arranged.
  • the sound absorbing and heat insulating cover a sound insulating metal plate, an inorganic fiber mat, and a heat insulating metal plate are sequentially laminated to have excellent heat resistance, and the opening area of each through hole provided in the sound insulating metal plate is adopted.
  • the opening area of each through hole provided in the sound insulating metal plate is adopted.
  • the sound absorbing and heat insulating cover according to the present invention is a sound absorbing and heat insulating cover in which a soundproof metal plate having a plurality of through holes on the surface, an inorganic fiber mat, and a heat insulating metal plate having a plurality of through holes on the surface are laminated in this order. It ’s a heat cover, The opening area of each through hole provided in the soundproof metal plate is 0.01 to 7.1 mm 2 .
  • FIG. 1 is a partial cross-sectional view of a mode example for explaining the configuration of the sound absorbing and heat insulating cover 1 according to the present invention.
  • the sound absorbing and heat insulating cover 1 according to the present invention is for soundproofing.
  • the metal plate 2, the inorganic fiber mat 3, and the heat-shielding metal plate 4 are laminated in this order.
  • examples of the soundproofing metal plate include those made of a heat-resistant metal plate.
  • the constituent material of the metal plate include one or more selected from aluminum, stainless steel, aluminum alloy, titanium, nickel, gold, silver, copper, iron, molybdenum, etc., and aluminum when weight reduction is required. Is preferable, and stainless steel is preferable when corrosion resistance is required.
  • the thickness of the soundproof metal plate is not particularly limited, but is usually preferably 0.1 to 1.0 mm, preferably 0.1 to 0.6 mm, in order to exhibit the desired heat resistance (heat shielding property). It is more preferably present, and more preferably 0.3 to 0.4 mm.
  • the shape of the soundproof metal plate is also not particularly limited, but since the soundproofing metal plate according to the present invention is arranged so that the soundproofing metal plate faces the object to be coated at the time of installation, the soundproofing metal plate is provided. It is preferable that the shape of the above has a shape corresponding to the object to be coated.
  • the soundproof metal plate has a plurality of through holes (indicated by reference numeral p in the example shown in FIG. 1) on its surface.
  • FIG. 2 is a partial cross-sectional view of a form example for explaining the function of the sound absorbing / heat insulating cover according to the present invention corresponding to FIG.
  • the sound absorbing and heat insulating cover 1 according to the present invention absorbs and shields the sound s1 emitted from the object to be covered by the soundproof metal plate 2 having a plurality of through holes p on the surface. It becomes easier to take in the inside of the heat cover 1, and the energy of the sound propagated inside the sound absorbing and heat insulating cover 1 through the through hole p is the fiber that constitutes the mat by the inorganic fiber mat 3 provided inside the sound absorbing and heat insulating cover 1. By being converted into vibration energy and absorbing sound, soundproofing performance can be suitably exhibited.
  • the hole shape of the through hole provided in the soundproof metal plate is not particularly limited, and the shape of the opening portion is preferably circular, elliptical or polygonal, for example, when viewed from above. More preferably.
  • the diameter thereof is preferably 0.1 to 3.0 mm, preferably 0.1 to 2.0 mm. Is more preferable, and 0.1 to 0.5 mm is further preferable.
  • the overall shape of the through hole provided in the soundproof metal plate is also not particularly limited, and is preferably columnar, polygonal columnar, or truncated cone, and more preferably columnar.
  • the hole diameter of the through holes provided in the soundproof metal plate is the peripheral length of each through hole measured by observing 10 through holes on the surface of the soundproof metal plate with a microscope (Keyence Co., Ltd., VHX-500). It means the arithmetic mean value when the diameter of a circle having a peripheral length corresponding to is calculated.
  • the opening area of each through hole provided in the soundproof metal plate is preferably 0.01 to 7.1 mm 2 , preferably 0.01 to 3.2 mm 2 . More preferably, it is more preferably 0.01 to 0.2 mm 2 .
  • the opening area of the through holes provided in the soundproof metal plate is determined by observing the main surface of the soundproof metal plate with a microscope and measuring the perimeters of all the through holes. It means a value obtained by finding a circle having a perimeter corresponding to the length, calculating the area of the circle individually, and finding the arithmetic average value thereof.
  • the opening area of the through hole p provided in the soundproof metal plate 2 is within the above range, so that the object to be covered by the engine or the like is covered. It becomes difficult for the heat h generated from the heat transfer to the inorganic fiber mat 3 side due to convection, and for this reason, excellent heat shielding properties can be exhibited.
  • the opening rate of the soundproof metal plate is preferably 0.01 to 20%, more preferably 0.01 to 10%, and 0. It is more preferably 01 to 1%.
  • the opening rate of the soundproof metal plate is calculated by the following formula from the opening areas of all the through holes obtained by the above method and the main surface area on one side of the soundproof metal plate.
  • Opening rate (%) ⁇ Total opening area of each through hole provided in the soundproof metal plate (mm 2 ) / One side main surface area of the soundproof metal plate (mm 2 ) ⁇ ⁇ 100 Means the value calculated by.
  • the arrangement of the plurality of through holes provided on the surface of the soundproof metal plate is not particularly limited, and it is preferable to arrange them as evenly as possible on the entire soundproof metal plate.
  • the sound absorbing and heat insulating cover according to the present invention is formed by laminating an inorganic fiber mat (indicated by reference numeral 3 in the examples shown in FIGS. 1 and 2) on a soundproof metal plate.
  • Examples of the inorganic fiber mat include a fiber assembly containing an inorganic fiber or a felt containing an inorganic fiber.
  • Examples of the inorganic fiber forming the inorganic fiber mat include one or more selected from glass fiber, alumina fiber, silica fiber and rock wool fiber.
  • inorganic fibers having a fiber diameter of 0.1 to 4 ⁇ m are preferable, those having a fiber diameter of 0.1 to 2 ⁇ m are more preferable, and those having a fiber diameter of 0.1 to 1 ⁇ m are further preferable.
  • Inorganic fibers having the above fiber diameter can be produced by, for example, a centrifugal method or a flame method.
  • the fiber diameter of the inorganic fiber means the arithmetic mean value when the maximum diameters of the cross sections of 20 inorganic fibers measured by a microscope are measured.
  • the desired heat resistance and flame retardancy can be more easily exhibited.
  • the fiber assembly containing inorganic fibers means one or more fibers containing inorganic fibers that are entangled with each other by means such as needle punching to form a sheet or a board. do.
  • the felt containing inorganic fibers means one or more fibers containing inorganic fibers integrated by means such as needle punching.
  • the inorganic fiber mat may contain organic fibers in addition to the inorganic fibers, and the organic fibers include polyester fiber felt such as polyethylene terephthalate felt, nylon fiber felt, and polyethylene.
  • polyester fiber felt such as polyethylene terephthalate felt, nylon fiber felt, and polyethylene.
  • One or more selected from fiber felt, polypropylene fiber felt, acrylic fiber felt, aramid fiber felt, silica-alumina ceramic fiber felt, silica fiber felt, cotton, wool, wood wool, waste fiber and the like can be mentioned.
  • the inorganic fiber mat preferably has a bulk density of 0.001 to 1.2 g / cm 3 , and more preferably 0.01 to 0.5 g / cm 3. It is preferably 0.025 to 0.1 g / cm 3 , and more preferably 0.025 to 0.1 g / cm 3.
  • the bulk density may be appropriately selected from those having a desired sound absorbing property according to the structure and thickness of the inorganic fiber mat.
  • the bulk density of the inorganic fiber mat means a value calculated by dividing the weight of the inorganic fiber mat as a measurement sample by the volume of the inorganic fiber mat measured with a caliper or the like.
  • the basis weight of the inorganic fiber mat is preferably 10 to 1000 g / m 2 , more preferably 15 to 500 g / m 2 , and 25 to 250 g / m 2. Is even more preferable.
  • the basis weight of the inorganic fiber mat is within the above range, it is possible to easily provide a sound absorbing and heat insulating cover that is lightweight and has a desired shape.
  • the desired heat resistance and sound absorbing property can be easily exhibited.
  • the thickness of the inorganic fiber mat is preferably 0.5 to 20 mm, more preferably 1.5 to 15 mm, and even more preferably 3 to 10 mm.
  • the inorganic fiber mat may be formed by laminating a plurality of fiber aggregates or felts containing inorganic fibers, and in this case, the total thickness of the plurality is within the above range. Just do it.
  • the sound absorbing and heat insulating cover according to the present invention since the thickness of the inorganic fiber mat is within the above range, the sound absorbing and heat insulating cover is excellent in flexibility and can be easily made thin (compact) while having sufficient sound absorbing properties. Can be demonstrated.
  • the inorganic fiber mat preferably has a ventilation resistance of 0.001 to 10 kPa ⁇ s / m, more preferably 0.05 to 5 kPa ⁇ s / m. It is more preferably 0.1 to 1 kPa ⁇ s / m.
  • the ventilation resistance of the inorganic fiber mat allows air to pass vertically at 0.4 cc / cm 2 / s with respect to the main surface of the inorganic fiber mat, and flows through the air pressure on the inlet side and the air pressure on the outlet side, respectively. It means the value obtained by dividing the difference (differential pressure) between the two when measured with a resistance measuring device (product name: KES-F8-AP1, manufactured by Kato Tech Co., Ltd.) by the flow velocity.
  • the sound absorbing and heat insulating cover according to the present invention has the inorganic fiber mat having the above-mentioned ventilation resistance, the flow resistance when sound passes from the outside can be easily controlled to easily control the sound pressure at a desired frequency. Can be reduced.
  • the sound absorbing and heat insulating cover according to the present invention exhibits desired heat resistance by having an inorganic fiber mat, and is provided on a through hole provided on the surface of a soundproof metal plate and on the surface of a heat insulating metal plate described later.
  • the soundproofing performance can be suitably exhibited by converting the energy of the sound taken in through the through hole into the energy of vibrating the constituent fibers of the inorganic fiber mat and absorbing the sound.
  • the sound absorbing and heat insulating cover according to the present invention is formed by laminating a heat insulating metal plate (indicated by reference numeral 4 in the examples shown in FIGS. 1 and 2) on the inorganic fiber mat.
  • examples of the heat insulating metal plate include those made of a heat-resistant metal plate.
  • examples of the constituent materials of the metal plate include the same materials as those of the above-mentioned soundproof metal plate. Specifically, aluminum, stainless steel, aluminum alloy, titanium, nickel, gold, silver, copper, iron, and molybdenum. When weight reduction is required, aluminum is preferable, and when corrosion resistance is required, stainless steel is preferable.
  • the thickness of the heat-shielding metal plate is also not particularly limited, but is usually preferably 0.1 to 1.0 mm, preferably 0.1 to 0.6 mm, in order to exhibit the desired heat resistance (heat-shielding property). More preferably, it is more preferably 0.3 to 0.4 mm.
  • the shape of the heat-shielding metal plate is also not particularly limited, but usually, since the above-mentioned sound-insulating metal plate has a shape corresponding to the object to be coated, the heat-shielding metal plate may have a shape corresponding to the sound-insulating metal plate. It is preferable to have. Since the heat insulating metal plate has a shape corresponding to the soundproof metal plate, the heat insulating metal plate and the soundproof metal plate can be easily held at a certain distance from each other, and the soundproofing of the entire sound absorbing and heat insulating cover can be easily held. Performance and heat resistance can be easily uniformed.
  • the heat insulating metal plate has a plurality of through holes (indicated by reference numeral b in the examples shown in FIGS. 1 and 2) on its surface.
  • the heat insulating metal plate 4 has a plurality of through holes b on the surface, so that the sound s2 reflected by, for example, the wall surface of the engine room is generated.
  • the inorganic fiber mat 3 provided inside the heat shield cover 1 converts the vibration energy of the fibers constituting the mat into sound absorption, so that the soundproofing performance can be suitably exhibited.
  • the hole shape of the through hole provided in the heat shield metal plate is not particularly limited, and the shape of the opening portion is preferably circular, elliptical or polygonal, for example, when viewed from above. Is more preferable.
  • the overall shape of the through hole provided in the heat shield metal plate is also not particularly limited, and is preferably columnar, polygonal columnar, or truncated cone.
  • the hole diameter of the through hole is preferably 0.1 to 3.0 mm. , 0.1 to 2.0 mm, more preferably 0.1 to 0.5 mm.
  • the diameter of the through holes provided in the heat shield metal plate is such that 10 through holes on the surface of the heat shield metal plate are observed with a microscope (Keyence Co., Ltd., VHX-500) and measured around each through hole. It means the arithmetic mean value when the diameter of a circle having a peripheral length corresponding to the length is calculated.
  • the opening area of each through hole provided in the heat insulating metal plate is preferably 0.01 to 7.1 mm 2 , preferably 0.01 to 3.2 mm 2 . More preferably, it is more preferably 0.01 to 0.2 mm 2 .
  • the opening area of the through holes provided in the heat shield metal plate is determined by observing the main surface of the heat shield metal plate with a microscope and measuring the perimeters of all the through holes. It means a value obtained by finding a circle having a perimeter corresponding to the length, calculating the area of the circle individually, and finding the arithmetic average value thereof.
  • the opening area of the through hole provided in the heat insulating metal plate is within the above range, for example, the sound reflected by the wall surface of the engine room or the like is reflected on the upper surface of the heat insulating metal plate. When passing from the side to the lower surface side, it can be easily taken into the inside of the sound absorbing / heat insulating cover.
  • the opening rate of the heat insulating metal plate is preferably 0.01 to 20%, more preferably 0.01 to 10%, and 0. It is more preferably 01 to 1%.
  • the opening rate of the heat-shielding metal plate is calculated by the following formula from the opening areas of all the through holes and the main surface area on one side of the heat-shielding metal plate obtained by the above method.
  • Opening rate (%) ⁇ total opening area of each through hole provided in the heat shield metal plate (mm 2 ) / main surface area on one side of the heat shield metal plate (mm 2 ) ⁇ ⁇ 100 Means the value calculated by.
  • the arrangement of the plurality of through holes provided on the surface of the heat shield metal plate is not particularly limited, and it is preferable to arrange them as evenly as possible on the entire heat shield metal plate.
  • the separation distance between the soundproof metal plate and the heat insulating metal plate is preferably 0.5 to 20 mm, more preferably 1.5 to 15 mm, and 3 to 3 to. It is more preferably 10 mm.
  • the method of fixing the soundproof metal plate, the inorganic fiber mat and the heat insulating metal plate is not particularly limited, and can be fixed by a conventionally known method.
  • the heat-shielding metal plate and the sound-insulating metal plate are separated from each other by a connecting tool having at least a support member inserted into the insertion holes provided at the corresponding positions of the heat-shielding metal plate and the sound-insulating metal plate. It is preferable to hold it while holding it.
  • the sound absorbing and heat insulating cover according to the present invention preferably has a thickness of 0.7 to 22 mm, more preferably 1.7 to 16.2 mm, and further preferably 3.6 to 10.8 mm. preferable.
  • the sound absorbing and heat insulating cover according to the present invention can exhibit sufficient sound absorbing and heat insulating properties even if the thickness is thin.
  • the sound absorbing and heat insulating cover according to the present invention is used by arranging the soundproof metal plate so as to face the object to be coated.
  • Examples of the object to be covered include an automobile engine.
  • the sound absorbing and heat insulating cover according to the present invention can be suitably used, for example, as a sound absorbing and heat insulating cover for an automobile engine instead of a conventional sound insulating cover for an automobile engine.
  • the sound absorbing and heat insulating cover according to the present invention is used as a sound absorbing and heat insulating cover for an automobile engine, for example, by arranging it on at least a part of the exhaust side wall surface and the upper surface of the engine, suitable sound absorbing characteristics can be easily exhibited. Can be done.
  • a soundproofing metal plate, an inorganic fiber mat, and a heat insulating metal plate are sequentially laminated as a sound absorbing and heat insulating cover on a covering object, and the soundproofing metal plate and the heat insulating metal plate are placed.
  • the sound absorbing and heat insulating cover a sound insulating metal plate, an inorganic fiber mat, and a heat insulating metal plate are sequentially laminated to have excellent heat resistance, and the opening area of each through hole provided in the sound insulating metal plate is adopted.
  • the opening area of each through hole provided in the sound insulating metal plate is adopted.
  • the engine unit according to the present invention is characterized by having an automobile engine and a sound absorbing and heat insulating cover according to the present invention that covers at least a part of the automobile engine.
  • the sound absorbing and heat insulating cover is arranged so that the soundproof metal plate faces at least a part of the automobile engine.
  • the details of the sound absorbing and heat insulating cover according to the present invention are as described above. Further, in the engine unit according to the present invention, known ones can be appropriately adopted as the automobile engine and the engine room.
  • the distance between the heat shield metal plate and the engine room (the gap formed between the heat shield metal plate and the wall surface of the engine room) when the engine unit is installed is preferably 0.1 mm or more. 5 mm or more is more preferable, and 10 mm or more is further preferable.
  • the engine unit according to the present invention has the sound absorbing and heat insulating cover according to the present invention, not only the sound generated from the automobile engine and passing through the soundproof metal plate but also reflected and shielded by the wall surface of the engine room.
  • the sound passing through the thermometal plate is also efficiently converted into vibration by the inorganic fiber mat, and the energy is attenuated, so that the sound pressure in the engine room can be suitably reduced.
  • the engine unit according to the present invention adopts a sound absorbing and heat insulating cover having excellent heat resistance in which a sound insulating metal plate, an inorganic fiber mat and a heat insulating metal plate are sequentially laminated, and is used as the sound insulating metal plate.
  • Example 1 As a soundproof metal plate, a metal plate (thickness 0.3 mm) cut out so as to have a length of 0.5 m and a width of 0.5 m (main surface area 0.25 m 2 ) is perforated (thickness 0.3 mm). Pore diameter 1.0 mm, opening area 0.8 mm 2 , pore opening rate 0.90%) and (2) as an inorganic fiber mat, the length is 0.5 m and the width is 0.5 m (main surface area 0.25 m 2 ).
  • a metal plate (hole diameter 0.5 mm, opening area 0.2 mm 2 , opening rate 0.20%) having holes processed in the aluminum plate (thickness 0.3 mm) cut out in this manner is sequentially arranged in this order. Then, a sound absorbing and heat insulating cover having a thickness of 6.6 mm was obtained.
  • the soundproofing metal plate 2 forms the sound absorbing and heat insulating cover 1 in which the soundproofing metal plate 2, the inorganic fiber mat 3, and the heat insulating metal plate 4 are laminated in this order. It is arranged on the floor surface f via spacers s having a length of 10 mm so as to be exposed on the upper side (with the back air layer A provided by 10 mm), and L-shaped on both side surfaces of the sound absorbing and heat insulating cover 1.
  • the sound absorption coefficient (reverberation chamber method sound absorption coefficient) was measured in a state of being sealed with the aluminum angle L of.
  • the sound absorption coefficient was measured by using an impulse response integration method based on ISO354 (2003) in the range of 400 Hz to 1000 Hz when sound N was incident from the upper side of the soundproof metal plate. The results are shown in FIG. 4 and Table 1.
  • Example 1 The sound absorbing and heat insulating cover obtained in Example 1 was used as a measurement sample, and the heat insulating property was evaluated by the method shown below.
  • the soundproofing metal plate 2 forms the sound absorbing and heat insulating cover 1 in which the soundproofing metal plate 2, the inorganic fiber mat 3, and the heat insulating metal plate 4 are laminated in this order.
  • a 10 mm long spacer s is placed on the floor surface f so as to be exposed on the upper side (with a back air layer A of 10 mm provided), and heaters are used as heat sources on both side surfaces of the sound absorbing and heat insulating cover 1. H was placed.
  • Example 2 In Example 1, the thickness was the same as in Example 1 except that (1) the hole diameter of the soundproof metal plate was changed to 0.5 mm, the opening area was changed to 0.2 mm 2 , and the opening ratio was changed to 0.06%. A 6.6 mm sound absorbing and heat insulating cover was obtained, and the sound absorbing property was evaluated in the same manner as in Example 1. The results are shown in FIG.
  • Example 3 In Example 1, the thickness was the same as in Example 1 except that (1) the hole diameter of the soundproof metal plate was changed to 2.0 mm, the opening area was changed to 3.1 mm 2 , and the opening ratio was changed to 0.23%. A 6.6 mm sound absorbing and heat insulating cover was obtained, and the sound absorbing property was evaluated in the same manner as in Example 1. The results are shown in FIG.
  • Example 4 In Example 1, the thickness was the same as in Example 1 except that (1) the hole diameter of the soundproof metal plate was changed to 3.0 mm, the opening area was changed to 7.1 mm 2 , and the opening ratio was changed to 8.00%. A 6.6 mm sound absorbing and heat insulating cover was obtained, and the sound absorbing property and the heat insulating property were evaluated in the same manner as in Example 1. The results are shown in FIG. 4 and Table 1.
  • Example 5 In Example 4, the thickness was the same as in Example 1 except that (1) the hole diameter of the heat shield metal plate was changed to 1.0 mm, the opening area was changed to 0.8 mm 2 , and the opening ratio was changed to 0.90%. A 6.6 mm sound absorbing and heat insulating cover was obtained, and the heat insulating property was evaluated in the same manner as in Example 1. The results are shown in Table 1.
  • Example 6 In Example 4, the thickness was the same as in Example 1 except that (1) the hole diameter of the heat shield metal plate was changed to 2.0 mm, the opening area was changed to 3.1 mm 2 , and the opening ratio was changed to 3.60%. A 6.6 mm sound absorbing and heat insulating cover was obtained, and the heat insulating property was evaluated in the same manner as in Example 1. The results are shown in Table 1.
  • Example 7 In Example 4, the thickness was the same as in Example 1 except that (1) the hole diameter of the heat shield metal plate was changed to 3.0 mm, the opening area was changed to 7.1 mm 2 , and the opening ratio was changed to 8.00%. A 6.6 mm sound absorbing and heat insulating cover was obtained, and the heat insulating property was evaluated in the same manner as in Example 1.
  • Example 1 As a metal plate, an aluminum plate (thickness 0.3 mm) cut out so as to have a length of 0.5 m and a width of 0.5 m (main surface area of 0.25 m 2 ) was obtained, and the above metal plate was used instead of the sound absorbing and heat insulating cover. Sound absorption and heat insulation were evaluated in the same manner as in Example 1 except that they were used. The results are shown in FIG. 4 and Table 1.
  • Example 2 As an inorganic fiber mat, a glass mat (bulk density 0.1 g / cm 3 , thickness 6 mm) cut out to a length of 0.5 m and a width of 0.5 m (main surface area 0.25 m 2 ) was obtained, and sound absorption and heat insulation were obtained. The sound absorption and heat insulation were evaluated in the same manner as in Example 1 except that the inorganic fiber mat was used instead of the cover. The results are shown in FIG. 4 and Table 1.
  • the sound absorbing and heat insulating covers obtained in Examples 1 to 7 are also excellent in the sound pressure suppressing effect in the frequency band of about 400 to 1000 Hz, which is a low frequency region, as shown in FIG. At the same time, it can be seen that it is excellent in heat resistance and heat shielding property.
  • the metal plates and the inorganic fiber mats obtained in Comparative Example 1 and Comparative Example 2, respectively sufficiently have a sufficient sound pressure in the frequency band of about 400 to 1000 Hz, which is a low frequency region. It can be seen that it cannot be suppressed and does not have sufficient heat shielding properties.
  • an engine unit having a new sound absorbing and heat insulating cover having sufficient soundproofing performance and excellent heat resistance and heat insulating property, and such a sound absorbing and heat insulating cover.

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Abstract

To provide a novel sound-absorbing heat-shielding cover that has sufficient soundproofing capabilities and excellent heat resistance properties and heat-shielding properties.　A sound-absorbing heat-shielding cover has: a soundproofing metal plate having a plurality of through holes in a surface thereof; an inorganic fiber mat; and a heat-shielding metal plate having a plurality of through holes in a surface thereof, layered in this order. An opening area of the through holes provided in the soundproofing metal plate is 0.01 to 7.1 mm2.

Description

吸音遮熱カバーおよびエンジンユニットSound absorption and heat insulation cover and engine unit
　本発明は、吸音遮熱カバーおよびエンジンユニットに関する。 The present invention relates to a sound absorbing and heat insulating cover and an engine unit.
　近年、自動車騒音に関する基準調和について、国連の欧州経済委員会（ＥＣＥ）の自動車基準調和世界フォーラムにおいて検討され、車両構造に関する規則の制定、改訂が行われている。
　従来より、自動車メーカー各社は様々な防音仕様について開発を進めており、自動車エンジン用防音カバーとしても種々のものが提案されている（例えば、特許文献１（特開２００２－１８０８４５号公報）参照）が、自動車の車外騒音については上記ＥＣＥの規則５１（ＥＣＥ　Ｒ５１）に規制値が定められ、同規制値を定めたRegulation EU No.540/2014によれば、２０１６年７月迄に７２ｄＢ（フェーズ１）、２０２０年７月迄に７０ｄＢ（フェーズ２）、２０２４年７月迄に６８ｄＢ（フェーズ３）と段階を追って厳しくなる基準が施行され、車外騒音の規制レベルを最終的には２０１６年７月までの基準に対して４ｄＢ、音圧エネルギーとして約１／２．５に低減するという大変厳しい要求がなされている。 In recent years, the harmonization of standards for automobile noise has been examined at the World Forum for Harmonization of Automotive Standards of the United Nations Economic Commission for Europe (ECE), and the rules regarding vehicle structure have been established and revised.
Conventionally, automobile manufacturers have been developing various soundproof specifications, and various soundproof covers for automobile engines have been proposed (see, for example, Patent Document 1 (Japanese Patent Laid-Open No. 2002-180845)). However, regarding the noise outside the vehicle, the regulation value is set in the above ECE Rule 51 (ECE R51), and according to Regulation EU No. 540/2014 which set the regulation value, 72 dB (phase) by July 2016. 1), 70 dB (Phase 2) by July 2020, 68 dB (Phase 3) by July 2024, and stricter standards will be enforced, and the regulation level of outside noise will be finally set to 7 in 2016. There is a very strict requirement to reduce the sound pressure energy to about 1 / 2.5 by 4 dB against the standard up to the month.
　ところで、上記自動車の騒音は、エンジン、モーター、トランスミッション等駆動系エンジンルームから発生する騒音のみならず、排気音、風切音、タイヤロードノイズ等が合算したものであるため、エンジンルームから発生する騒音の低減のみで上記目標を達成しようとした場合、エンジンルームにおいて５～６ｄＢ、音圧エネルギーとして１／４に低減するという大きな騒音低減が必要になることから、従来の自動車エンジン用防音カバーでは対応が困難になってきている。 By the way, the above-mentioned automobile noise is generated from the engine room because it is a sum of not only the noise generated from the drive system engine room such as the engine, the motor, and the transmission, but also the exhaust noise, the wind noise, the tire road noise, and the like. If the above target is to be achieved only by reducing noise, it is necessary to reduce noise by 5 to 6 dB in the engine room and 1/4 as sound pressure energy. It is becoming difficult to deal with it.
特開２００２－１８０８４５号公報Japanese Unexamined Patent Publication No. 2002-180845
　このように、従来提案されてきた自動車エンジン用防音カバーでは、益々厳しくなる規制水準に対し必ずしも十分な騒音抑制効果は得られ難い。 In this way, it is difficult to obtain a sufficient noise suppression effect with the soundproof cover for automobile engines that has been proposed in the past, against the increasingly strict regulation level.
　このような状況下、防音仕様として、例えば、エンジンのほぼ全体、すなわち、エンジン壁面・上面(ボンネット)側・下面(アンダーボディー)側のほぼ全面に防音材を施行し、音源となるエンジン全体を防音材で覆い車外への騒音漏洩を抑制すると同時にその吸音効果によりエンジンルーム内の騒音レベルを低減させる、(ニア)エンジンカプセル化による対応が考えられる。 Under such circumstances, as a soundproofing specification, for example, soundproofing material is applied to almost the entire engine, that is, almost the entire surface of the engine wall surface, upper surface (bonnet) side, and lower surface (underbody) side, and the entire engine serving as a sound source is used. It is conceivable to use (near) engine encapsulation, which is covered with a soundproofing material to suppress noise leakage to the outside of the vehicle and at the same time reduce the noise level in the engine room by its sound absorbing effect.
　しかしながら、ダウンサイジングを施した最近の車両のエンジンルーム内は各部品が高度に集積され、スペースが狭いために、上記カプセル化を行う場合においても防音材に用意された厚さは１０～２０ｍｍ程度と極く薄い一方で、防音材による吸音および遮音効果により騒音を低減しようとした場合、特に１ｋＨｚ以下の比較的低周波数側の騒音は防音材の厚さ及び質量に依存するので、得られる効果は極く限定的なものとなる。 However, since each part is highly integrated in the engine room of a recent downsized vehicle and the space is small, the thickness prepared for the soundproof material is about 10 to 20 mm even when the above encapsulation is performed. On the other hand, when trying to reduce noise by the sound absorption and sound insulation effect of the soundproof material, the noise on the relatively low frequency side of 1 kHz or less depends on the thickness and mass of the soundproof material, so the effect obtained. Will be very limited.
　防音材が十分な吸音性能を発揮できない場合、エンジンルーム内には大きな反響音が響き、遮音性能も十分でない場合には、減衰しきれないエネルギーがエンジンルームの壁面・上面・下面を振動させ、さらに大きな騒音が発生することもある。 If the soundproofing material cannot exhibit sufficient sound absorption performance, a large reverberant sound will be heard in the engine room, and if the sound insulation performance is not sufficient, the energy that cannot be attenuated will vibrate the wall surface, top surface, and bottom surface of the engine room. Even louder noise may be generated.
　一方、エンジンルーム内においてはエンジンの排気側壁面及び上面（燃焼排ガスが通過するエキゾースト・マニフォールド近傍）等が２００～２３０℃程度の温度に達し、係る高温の排熱によってエンジン本体の外部に設けられる樹脂部品や電装部品が損傷する場合が考えられる。 On the other hand, in the engine room, the exhaust side wall surface and the upper surface of the engine (near the exhaust manifold through which the combustion exhaust gas passes) reach a temperature of about 200 to 230 ° C., and are provided outside the engine body by the high temperature exhaust heat. Resin parts and electrical parts may be damaged.
　このような状況下、本発明は、自動車エンジン用防音カバーとして使用し得る、十分な防音性能を有するとともに耐熱性および遮熱性に優れた新規な吸音遮熱カバーおよび係る吸音遮熱カバーを有するエンジンユニットを提供することを目的とするものである。 Under such circumstances, the present invention can be used as a soundproofing cover for an automobile engine, and has a novel sound absorbing and heat insulating cover having sufficient soundproofing performance and excellent heat resistance and heat insulating properties, and an engine having such a sound absorbing and heat insulating cover. The purpose is to provide a unit.
　上記目的を達成するために、本発明者等は、エンジンルーム内の騒音を吸収する防音用金属板をエンジン上に設けた上で、係る防音用金属板上に上記高温の排熱によるエンジン部品の損傷を抑制するためにさらに遮熱金属板を設けることを着想した。
　しかしながら、本発明者等がさらに検討したところ、エンジン上に防音用金属板および遮熱金属板を順次載置した場合には、エンジンルーム内で反響する音も遮熱金属板によって反射される結果、防音用金属板による防音効果（吸音効果）が著しく低減し、また、必ずしも十分な遮熱性を発揮し得ないことが判明した。 In order to achieve the above object, the present inventors have provided a soundproof metal plate for absorbing noise in the engine room on the engine, and then the engine parts due to the high temperature exhaust heat are provided on the soundproof metal plate. The idea was to provide a heat-shielding metal plate to prevent damage to the engine.
However, as a result of further studies by the present inventors, when the soundproof metal plate and the heat shield metal plate are sequentially placed on the engine, the sound reverberating in the engine room is also reflected by the heat shield metal plate. It has been found that the soundproofing effect (sound absorbing effect) of the soundproofing metal plate is remarkably reduced, and that sufficient heat insulating properties cannot always be exhibited.
　このような状況下、本発明者等がさらに検討したところ、表面に複数の貫通孔を有する防音用金属板と、無機繊維マットと、表面に複数の貫通孔を有する遮熱金属板とをこの順番で積層した吸音遮熱カバーであって、前記防音用金属板に設けた各貫通孔の開孔面積が０．０１～７．１ｍｍ２である吸音遮熱カバーにより上記技術課題を解決し得ることを見出し、本知見に基づいて本発明を完成するに至った。 Under such circumstances, as a result of further studies by the present inventors, a soundproof metal plate having a plurality of through holes on the surface, an inorganic fiber mat, and a heat shield metal plate having a plurality of through holes on the surface are obtained. The above technical problems can be solved by a sound absorbing and heat insulating cover laminated in order, wherein the opening area of each through hole provided in the soundproof metal plate is 0.01 to 7.1 mm 2. Based on this finding, the present invention has been completed.
　すなわち、本発明は、
（１）表面に複数の貫通孔を有する防音用金属板と、無機繊維マットと、表面に複数の貫通孔を有する遮熱金属板とをこの順番で積層した吸音遮熱カバーであって、
　前記防音用金属板に設けた各貫通孔の開孔面積が０．０１～７．１ｍｍ２である
ことを特徴とする吸音遮熱カバー、
（２）前記防音用金属板の開孔率が０．０１～２０％である上記（１）に記載の吸音遮熱カバー、
（３）前記無機繊維マットが、ガラス繊維、アルミナ繊維、シリカ繊維およびロックウール繊維から選ばれる一種以上の無機繊維を含む上記（１）または（２）に記載の吸音遮熱カバー、
（４）前記防音用金属板または遮熱金属板の厚さが０．１～１．０ｍｍである上記（１）～（３）のいずれかに記載の吸音遮熱カバー、
（５）厚さが０．７～２２ｍｍである上記（１）～（４）のいずれかに記載の吸音遮熱カバー、
（６）前記吸音遮熱カバーが自動車エンジン用吸音遮熱カバーである上記（１）～（５）のいずれかに記載の吸音遮熱カバー、および
（７）自動車用エンジンと当該自動車用エンジンの少なくとも一部を覆う上記（６）に記載の吸音遮熱カバーとを有することを特徴とするエンジンユニット
を提供するものである。 That is, the present invention
(1) A sound absorbing and heat insulating cover in which a soundproof metal plate having a plurality of through holes on the surface, an inorganic fiber mat, and a heat insulating metal plate having a plurality of through holes on the surface are laminated in this order.
A sound absorbing and heat insulating cover, characterized in that the opening area of each through hole provided in the soundproof metal plate is 0.01 to 7.1 mm 2.
(2) The sound absorbing and heat insulating cover according to (1) above, wherein the opening ratio of the soundproof metal plate is 0.01 to 20%.
(3) The sound absorbing and heat insulating cover according to (1) or (2) above, wherein the inorganic fiber mat contains one or more inorganic fibers selected from glass fiber, alumina fiber, silica fiber and rock wool fiber.
(4) The sound absorbing and heat insulating cover according to any one of (1) to (3) above, wherein the soundproof metal plate or the heat insulating metal plate has a thickness of 0.1 to 1.0 mm.
(5) The sound absorbing and heat insulating cover according to any one of (1) to (4) above, which has a thickness of 0.7 to 22 mm.
(6) The sound absorbing and heat insulating cover according to any one of (1) to (5) above, wherein the sound absorbing and heat insulating cover is a sound absorbing and heat insulating cover for an automobile engine, and (7) an automobile engine and the automobile engine. Provided is an engine unit characterized by having the sound absorbing and heat insulating cover according to the above (6), which covers at least a part thereof.
　本発明によれば、被覆対象物上に、吸音遮熱カバーとして防音用金属板と無機繊維マットと遮熱金属板とを順次積層したものを配置するとともに、上記防音用金属板および遮熱金属板の表面に複数の貫通孔を設けることにより、内部（被覆対象物）側から発せられた音が無機繊維マットで吸収され易くなるとともに、外部側から侵入する音も無機繊維マットで吸収され易くなる。また、吸音遮熱カバーとして防音用金属板と無機繊維マットと遮熱金属板とを順次積層した耐熱性に優れたものを採用するとともに、上記防音用金属板に設けた各貫通孔の開口面積を一定範囲内に抑制することにより、内部（被覆対象物）側から無機繊維マットへの対流による熱の伝導を抑制し優れた遮熱性を発揮することができる。
　このため、本発明によれば、十分な防音性能を有するとともに耐熱性および優れた新規な吸音遮熱カバーおよび係る吸音遮熱カバーを有するエンジンユニットを提供することができる。 According to the present invention, a soundproof metal plate, an inorganic fiber mat, and a heat shield metal plate are sequentially laminated as a sound absorption and heat shield cover on a covering object, and the soundproof metal plate and the heat shield metal are arranged. By providing a plurality of through holes on the surface of the plate, the sound emitted from the inside (covered object) side is easily absorbed by the inorganic fiber mat, and the sound invading from the outside side is also easily absorbed by the inorganic fiber mat. Become. Further, as the sound absorbing and heat insulating cover, a sound insulating metal plate, an inorganic fiber mat, and a heat insulating metal plate are sequentially laminated to have excellent heat resistance, and the opening area of each through hole provided in the sound insulating metal plate is adopted. By suppressing the heat within a certain range, heat conduction due to convection from the inside (covered object) side to the inorganic fiber mat can be suppressed, and excellent heat shielding properties can be exhibited.
Therefore, according to the present invention, it is possible to provide an engine unit having a new sound absorbing and heat insulating cover having sufficient soundproofing performance and excellent heat resistance and the sound absorbing and heat insulating cover.
本発明に係る吸音遮熱カバーの構成を説明するための形態例の部分断面図である。It is a partial cross-sectional view of the form example for demonstrating the structure of the sound absorption heat insulation cover which concerns on this invention. 本発明に係る吸音遮熱カバーの形態例の部分断面図である。It is a partial cross-sectional view of the form example of the sound absorption heat insulation cover which concerns on this invention. 本発明の実施例および比較例における吸音性評価方法を説明するための概略断面図である。It is the schematic sectional drawing for demonstrating the sound absorption property evaluation method in an Example and a comparative example of this invention. 本発明の実施例および比較例における吸音性評価結果を示す図である。It is a figure which shows the sound absorption property evaluation result in an Example and a comparative example of this invention. 本発明の実施例および比較例における遮熱性評価方法を説明するための概略断面図である。It is schematic cross-sectional view for demonstrating the heat-shielding property evaluation method in an Example and a comparative example of this invention.
　先ず、本発明に係る吸音遮熱カバーについて説明する。
　本発明に係る吸音遮熱カバーは、表面に複数の貫通孔を有する防音用金属板と、無機繊維マットと、表面に複数の貫通孔を有する遮熱金属板とをこの順番で積層した吸音遮熱カバーであって、
　前記防音用金属板に設けた各貫通孔の開孔面積が０．０１～７．１ｍｍ２である
ことを特徴とするものである。 First, the sound absorbing and heat insulating cover according to the present invention will be described.
The sound absorbing and heat insulating cover according to the present invention is a sound absorbing and heat insulating cover in which a soundproof metal plate having a plurality of through holes on the surface, an inorganic fiber mat, and a heat insulating metal plate having a plurality of through holes on the surface are laminated in this order. It ’s a heat cover,
The opening area of each through hole provided in the soundproof metal plate is 0.01 to 7.1 mm 2 .
　図１は、本発明に係る吸音遮熱カバー１の構成を説明するための形態例の部分断面図であって、図１に示すように、本発明に係る吸音遮熱カバー１は、防音用金属板２と、無機繊維マット３と、遮熱金属板４とをこの順番で積層したものである。 FIG. 1 is a partial cross-sectional view of a mode example for explaining the configuration of the sound absorbing and heat insulating cover 1 according to the present invention. As shown in FIG. 1, the sound absorbing and heat insulating cover 1 according to the present invention is for soundproofing. The metal plate 2, the inorganic fiber mat 3, and the heat-shielding metal plate 4 are laminated in this order.
　本発明に係る吸音遮熱カバーにおいて、防音用金属板としては、耐熱性を有する金属板からなるものを挙げることができる。
　上記金属板の構成材料としては、アルミニウム、ステンレス鋼、アルミニウム合金、チタン、ニッケル、金、銀、銅、鉄、モリブデン等から選ばれる一種以上を挙げることができ、軽量化が求められる場合はアルミニウムが好ましく、耐腐食性が求められる場合はステンレス鋼が好ましい。 In the sound absorbing and heat insulating cover according to the present invention, examples of the soundproofing metal plate include those made of a heat-resistant metal plate.
Examples of the constituent material of the metal plate include one or more selected from aluminum, stainless steel, aluminum alloy, titanium, nickel, gold, silver, copper, iron, molybdenum, etc., and aluminum when weight reduction is required. Is preferable, and stainless steel is preferable when corrosion resistance is required.
　防音用金属板の厚みは、特に制限されないが、所望の耐熱性（遮熱性）を発揮する上では、通常、０．１～１．０ｍｍであることが好ましく、０．１～０．６ｍｍであることがより好ましく、０．３～０．４ｍｍであることがさらに好ましい。 The thickness of the soundproof metal plate is not particularly limited, but is usually preferably 0.1 to 1.0 mm, preferably 0.1 to 0.6 mm, in order to exhibit the desired heat resistance (heat shielding property). It is more preferably present, and more preferably 0.3 to 0.4 mm.
　防音用金属板の形状も特に制限されないが、本発明に係る吸音遮熱カバーは、設置時に防音用金属板が被覆対象物に面するように配置されるものであることから、防音被覆金属板の形状も被覆対象物に対応した形状を有することが好ましい。 The shape of the soundproof metal plate is also not particularly limited, but since the soundproofing metal plate according to the present invention is arranged so that the soundproofing metal plate faces the object to be coated at the time of installation, the soundproofing metal plate is provided. It is preferable that the shape of the above has a shape corresponding to the object to be coated.
　本発明に係る吸音遮熱カバーにおいて、防音用金属板はその表面に（図１に示す例において符号ｐで示す）複数の貫通孔を有している。 In the sound absorbing and heat insulating cover according to the present invention, the soundproof metal plate has a plurality of through holes (indicated by reference numeral p in the example shown in FIG. 1) on its surface.
　図２は、図１に対応する本発明に係る吸音遮熱カバーの機能を説明するための形態例の部分断面図である。
　図２に例示するように、本発明に係る吸音遮熱カバー１は、防音用金属板２が表面に複数の貫通孔ｐを有することにより、被覆対象物側から発せられた音ｓ１を吸音遮熱カバー１の内部に取り込みやすくなり、貫通孔ｐを介して吸音遮熱カバー１内部に伝搬した音のエネルギーが、吸音遮熱カバー１内部に設けた無機繊維マット３によってマットを構成する繊維の振動エネルギーに変換され、吸音することにより、防音性能を好適に発揮することができる。 FIG. 2 is a partial cross-sectional view of a form example for explaining the function of the sound absorbing / heat insulating cover according to the present invention corresponding to FIG.
As illustrated in FIG. 2, the sound absorbing and heat insulating cover 1 according to the present invention absorbs and shields the sound s1 emitted from the object to be covered by the soundproof metal plate 2 having a plurality of through holes p on the surface. It becomes easier to take in the inside of the heat cover 1, and the energy of the sound propagated inside the sound absorbing and heat insulating cover 1 through the through hole p is the fiber that constitutes the mat by the inorganic fiber mat 3 provided inside the sound absorbing and heat insulating cover 1. By being converted into vibration energy and absorbing sound, soundproofing performance can be suitably exhibited.
　防音用金属板に設けられる貫通孔の孔形状は特に制限されず、上面視したときに、開孔部の形状が、例えば、円形状、楕円形状または多角形状であることが好ましく、円形状であることがより好ましい。
　防音用金属板に設けられる貫通孔の上面視したときの開孔部形状が円形状である場合、その直径は、０．１～３．０ｍｍであることが好ましく、０．１ ～２．０ｍｍであることがより好ましく、０．１～０．５ｍｍであることがさらに好ましい。
　防音用金属板に設けられる貫通孔の全体形状も特に制限されず、円柱状、多角柱状または円錐台状であることが好ましく、円柱状であることがより好ましい。 The hole shape of the through hole provided in the soundproof metal plate is not particularly limited, and the shape of the opening portion is preferably circular, elliptical or polygonal, for example, when viewed from above. More preferably.
When the shape of the opening portion of the through hole provided in the soundproof metal plate when viewed from above is circular, the diameter thereof is preferably 0.1 to 3.0 mm, preferably 0.1 to 2.0 mm. Is more preferable, and 0.1 to 0.5 mm is further preferable.
The overall shape of the through hole provided in the soundproof metal plate is also not particularly limited, and is preferably columnar, polygonal columnar, or truncated cone, and more preferably columnar.
　上記防音用金属板に設けた貫通孔の孔径は、防音用金属板表面の１０個の貫通孔をマイクロスコープ（（株）キーエンス、ＶＨＸ－５００）で観察し、測定した各貫通孔の周囲長に相当する周囲長を有する円の直径を求めたときの算術平均値を意味する。 The hole diameter of the through holes provided in the soundproof metal plate is the peripheral length of each through hole measured by observing 10 through holes on the surface of the soundproof metal plate with a microscope (Keyence Co., Ltd., VHX-500). It means the arithmetic mean value when the diameter of a circle having a peripheral length corresponding to is calculated.
　本発明に係る吸音遮熱カバーにおいて、上記防音用金属板に設ける各貫通孔の開孔面積は、０．０１～７．１ｍｍ２であることが好ましく、０．０１～３．２ｍｍ２であることがより好ましく、０．０１～０．２ｍｍ２であることがさらに好ましい。 In the sound absorbing and heat insulating cover according to the present invention, the opening area of each through hole provided in the soundproof metal plate is preferably 0.01 to 7.1 mm 2 , preferably 0.01 to 3.2 mm 2 . More preferably, it is more preferably 0.01 to 0.2 mm 2 .
　本出願において、防音用金属板に設けた貫通孔の開孔面積は、防音用金属板の主表面を、マイクロスコープで観察して全ての貫通孔の周囲長を各々測定し、測定した各周囲長に相当する周囲長を有する円を求めた上で、係る円の面積を個々に算出し、その算術平均値を求めることによって得た値を意味する。 In the present application, the opening area of the through holes provided in the soundproof metal plate is determined by observing the main surface of the soundproof metal plate with a microscope and measuring the perimeters of all the through holes. It means a value obtained by finding a circle having a perimeter corresponding to the length, calculating the area of the circle individually, and finding the arithmetic average value thereof.
　図２に例示するように、本発明に係る吸音遮熱カバー１においては、防音用金属板２に設けた貫通孔ｐの開孔面積が上記範囲内にあることにより、エンジン等の被覆対象物から発せられた熱ｈが無機繊維マット３側に対流により伝熱し難くなり、このために優れた遮熱性を発揮することができる。 As illustrated in FIG. 2, in the sound absorbing and heat insulating cover 1 according to the present invention, the opening area of the through hole p provided in the soundproof metal plate 2 is within the above range, so that the object to be covered by the engine or the like is covered. It becomes difficult for the heat h generated from the heat transfer to the inorganic fiber mat 3 side due to convection, and for this reason, excellent heat shielding properties can be exhibited.
　また、本発明に係る吸音遮熱カバーにおいて、上記防音用金属板の開孔率は、０．０１～２０％であることが好ましく、０．０１～１０％であることがより好ましく、０．０１～１％であることがさらに好ましい。 Further, in the sound absorbing and heat insulating cover according to the present invention, the opening rate of the soundproof metal plate is preferably 0.01 to 20%, more preferably 0.01 to 10%, and 0. It is more preferably 01 to 1%.
　本出願において、上記防音用金属板の開孔率は、上述した方法により求めた全ての貫通孔の開孔面積および防音用金属板の片側主表面積から、下記式　
　開孔率（％）＝｛防音用金属板に設けた各貫通孔の開口面積の総和（ｍｍ２）／防音用金属板の片側主表面積（ｍｍ２）｝×１００
により算出される値を意味する。 In the present application, the opening rate of the soundproof metal plate is calculated by the following formula from the opening areas of all the through holes obtained by the above method and the main surface area on one side of the soundproof metal plate.
Opening rate (%) = {Total opening area of each through hole provided in the soundproof metal plate (mm 2 ) / One side main surface area of the soundproof metal plate (mm 2 )} × 100
Means the value calculated by.
　防音用金属板の開孔率が上記範囲内にあることによっても、エンジン等の被覆対象物から発せられた熱を無機繊維マット側に対流により伝熱し難くなり、このために優れた遮熱性を容易に発揮することができる。 Even if the aperture ratio of the soundproof metal plate is within the above range, it becomes difficult for the heat generated from the object to be coated such as the engine to be transferred to the inorganic fiber mat side by convection, and therefore excellent heat insulation is provided. It can be easily exerted.
  防音用金属板表面に設ける複数の貫通孔の配置についても特に限定されず、防音用金属板全体にできる限り均等に配置することが好ましい。 The arrangement of the plurality of through holes provided on the surface of the soundproof metal plate is not particularly limited, and it is preferable to arrange them as evenly as possible on the entire soundproof metal plate.
　本発明に係る吸音遮熱カバーは、防音用金属板上に（図１や図２に示す例において符号３で示す）無機繊維マットを積層してなるものである。 The sound absorbing and heat insulating cover according to the present invention is formed by laminating an inorganic fiber mat (indicated by reference numeral 3 in the examples shown in FIGS. 1 and 2) on a soundproof metal plate.
　無機繊維マットとしては、無機繊維を含有する繊維集成体または無機繊維含有フェルトを挙げることができる。 Examples of the inorganic fiber mat include a fiber assembly containing an inorganic fiber or a felt containing an inorganic fiber.
　無機繊維マットを形成する無機繊維としては、ガラス繊維、アルミナ繊維、シリカ繊維およびロックウール繊維から選ばれる一種以上を挙げることができる。 Examples of the inorganic fiber forming the inorganic fiber mat include one or more selected from glass fiber, alumina fiber, silica fiber and rock wool fiber.
　上記無機繊維としては、繊維径が、０．１～４μｍであるものが好ましく、０．１～２μｍであるものがより好ましく、０．１～１μｍであるものがさらに好ましい。
　上記繊維径を有する無機繊維は、例えば遠心法または火炎法で製造することができる。 As the inorganic fiber, those having a fiber diameter of 0.1 to 4 μm are preferable, those having a fiber diameter of 0.1 to 2 μm are more preferable, and those having a fiber diameter of 0.1 to 1 μm are further preferable.
Inorganic fibers having the above fiber diameter can be produced by, for example, a centrifugal method or a flame method.
　なお、本出願書類において、無機繊維の繊維径は、マイクロスコープにより測定した２０本の無機繊維断面の最大径を各々測定したときの算術平均値を意味する。 In the application documents, the fiber diameter of the inorganic fiber means the arithmetic mean value when the maximum diameters of the cross sections of 20 inorganic fibers measured by a microscope are measured.
　上記無機繊維マットが上記繊維径を有する無機繊維を構成繊維として含むことにより、所望の耐熱性、難燃性をより容易に発揮することができる。 By including the inorganic fiber having the fiber diameter as a constituent fiber in the inorganic fiber mat, the desired heat resistance and flame retardancy can be more easily exhibited.
　本出願書類において、無機繊維を含む繊維集成体とは、無機繊維を含む一種以上の繊維をニードルパンチなどの手段で一体化すること等によって互いに絡み合ってシート状またはボード状に形成したものを意味する。また、本出願書類において、無機繊維を含むフェルトとは、無機繊維を含む一種以上の繊維をニードルパンチ等の手段で一体化したものを意味する。 In the present application documents, the fiber assembly containing inorganic fibers means one or more fibers containing inorganic fibers that are entangled with each other by means such as needle punching to form a sheet or a board. do. Further, in the present application documents, the felt containing inorganic fibers means one or more fibers containing inorganic fibers integrated by means such as needle punching.
　本発明に係る吸音遮熱カバーにおいて、無機繊維マットは、無機繊維以外に有機繊維を含有するものであってもよく、有機繊維としては、ポリエチレンテレフタレートフェルト等のポリエステル繊維フェルト、ナイロン繊維フェルト、ポリエチレン繊維フェルト、ポリプロピレン繊維フェルト、アクリル繊維フェルト、アラミド繊維フェルト、シリカーアルミナセラミックスファイバーフェルト、シリカ繊維フェルト、綿、羊毛、木毛、クズ繊維等から選ばれる一種以上を挙げることができる。 In the sound absorbing and heat insulating cover according to the present invention, the inorganic fiber mat may contain organic fibers in addition to the inorganic fibers, and the organic fibers include polyester fiber felt such as polyethylene terephthalate felt, nylon fiber felt, and polyethylene. One or more selected from fiber felt, polypropylene fiber felt, acrylic fiber felt, aramid fiber felt, silica-alumina ceramic fiber felt, silica fiber felt, cotton, wool, wood wool, waste fiber and the like can be mentioned.
　本発明に係る吸音遮熱カバーにおいて、無機繊維マットは、嵩密度が、０．００１～１．２ｇ／ｃｍ３であるものが好ましく、０．０１～０．５ｇ／ｃｍ３であるものがより好ましく、０．０２５～０．１ｇ／ｃｍ３であるものがさらに好ましい。
　上記嵩密度は、無機繊維マットの構造および厚み等に応じて、所望の吸音性を有するものから適宜選択すればよい。 In the sound absorbing and heat insulating cover according to the present invention, the inorganic fiber mat preferably has a bulk density of 0.001 to 1.2 g / cm 3 , and more preferably 0.01 to 0.5 g / cm 3. It is preferably 0.025 to 0.1 g / cm 3 , and more preferably 0.025 to 0.1 g / cm 3.
The bulk density may be appropriately selected from those having a desired sound absorbing property according to the structure and thickness of the inorganic fiber mat.
　本出願書類において、無機繊維マットの嵩密度は、測定試料となる無機繊維マットの重量をノギス等で測定した無機繊維マットの体積で除すことにより算出した値を意味する。 In the application documents, the bulk density of the inorganic fiber mat means a value calculated by dividing the weight of the inorganic fiber mat as a measurement sample by the volume of the inorganic fiber mat measured with a caliper or the like.
　上記嵩密度を達成する上で、無機繊維マットの目付は、１０～１０００ｇ／ｍ２であることが好ましく、１５～５００ｇ／ｍ２であることがより好ましく、２５～２５０ｇ／ｍ２であることがさらに好ましい。
　無機繊維マットの目付が上記範囲内にあることにより、軽量で所望形状を有する吸音遮熱カバーを容易に提供することができる。 In order to achieve the bulk density, the basis weight of the inorganic fiber mat is preferably 10 to 1000 g / m 2 , more preferably 15 to 500 g / m 2 , and 25 to 250 g / m 2. Is even more preferable.
When the basis weight of the inorganic fiber mat is within the above range, it is possible to easily provide a sound absorbing and heat insulating cover that is lightweight and has a desired shape.
　本発明に係る吸音遮熱カバーにおいては、無機繊維マットの嵩密度が上記範囲内にあることにより、所望の耐熱性および吸音性を容易に発揮することができる。 In the sound absorbing and heat insulating cover according to the present invention, when the bulk density of the inorganic fiber mat is within the above range, the desired heat resistance and sound absorbing property can be easily exhibited.
　本発明に係る吸音遮熱カバーにおいて、無機繊維マットの厚みは、０．５～２０ｍｍであることが好ましく、１．５～１５ｍｍであることがより好ましく、３～１０ｍｍであることがさらに好ましい。 In the sound absorbing and heat insulating cover according to the present invention, the thickness of the inorganic fiber mat is preferably 0.5 to 20 mm, more preferably 1.5 to 15 mm, and even more preferably 3 to 10 mm.
　本発明に係る吸音遮熱カバーにおいて、無機繊維マットは、無機繊維を含む繊維集成体やフェルトを複数積層してなるものであってもよく、この場合、複数総の厚みが上記範囲内にあればよい。 In the sound absorbing and heat insulating cover according to the present invention, the inorganic fiber mat may be formed by laminating a plurality of fiber aggregates or felts containing inorganic fibers, and in this case, the total thickness of the plurality is within the above range. Just do it.
　本発明に係る吸音遮熱カバーにおいて、無機繊維マットの厚みが上記範囲内にあることにより、柔軟性に優れるとともに吸音遮熱カバーの薄型化（コンパクト化）を図りつつ十分な吸音性を容易に発揮することができる。 In the sound absorbing and heat insulating cover according to the present invention, since the thickness of the inorganic fiber mat is within the above range, the sound absorbing and heat insulating cover is excellent in flexibility and can be easily made thin (compact) while having sufficient sound absorbing properties. Can be demonstrated.
　本発明に係る吸音遮熱カバーにおいて、無機繊維マットは、通気抵抗が、０．００１～１０ｋＰａ・ｓ／ｍであるものが好ましく、０．０５～５ｋＰａ・ｓ／ｍであるものがより好ましく、０．１～１ｋＰａ・ｓ／ｍであるものがさらに好ましい。 In the sound absorbing and heat insulating cover according to the present invention, the inorganic fiber mat preferably has a ventilation resistance of 0.001 to 10 kPa · s / m, more preferably 0.05 to 5 kPa · s / m. It is more preferably 0.1 to 1 kPa · s / m.
　本出願書類において、無機繊維マットの通気抵抗は、無機繊維マットの主表面に対して、垂直方向に０．４ｃｃ／ｃｍ２／ｓで空気を通過させ、入口側および出口側の気圧を各々流れ抵抗測定器（製品名：ＫＥＳ－Ｆ８－ＡＰ１、カトーテック（株）製）で測定したときにおける両者の差（差圧）を流速で除した値を意味する。  In the present application documents, the ventilation resistance of the inorganic fiber mat allows air to pass vertically at 0.4 cc / cm 2 / s with respect to the main surface of the inorganic fiber mat, and flows through the air pressure on the inlet side and the air pressure on the outlet side, respectively. It means the value obtained by dividing the difference (differential pressure) between the two when measured with a resistance measuring device (product name: KES-F8-AP1, manufactured by Kato Tech Co., Ltd.) by the flow velocity.
　本発明に係る吸音遮熱カバーは、上記通気抵抗を有する無機繊維マットを有するものであることにより、外部から音が通過する際の流れ抵抗を容易に制御して所望周波数の音圧を容易に低減することができる。 Since the sound absorbing and heat insulating cover according to the present invention has the inorganic fiber mat having the above-mentioned ventilation resistance, the flow resistance when sound passes from the outside can be easily controlled to easily control the sound pressure at a desired frequency. Can be reduced.
　本発明に係る吸音遮熱カバーは、無機繊維マットを有することによって所望の耐熱性を発揮するとともに、防音用金属板の表面に設けられた貫通孔および後述する遮熱金属板の表面に設けられた貫通孔を介して取り込んだ音のエネルギーを無機繊維マットの構成繊維を振動させるエネルギーに変換し、吸音することにより、防音性能を好適に発揮することができる。 The sound absorbing and heat insulating cover according to the present invention exhibits desired heat resistance by having an inorganic fiber mat, and is provided on a through hole provided on the surface of a soundproof metal plate and on the surface of a heat insulating metal plate described later. The soundproofing performance can be suitably exhibited by converting the energy of the sound taken in through the through hole into the energy of vibrating the constituent fibers of the inorganic fiber mat and absorbing the sound.
　本発明に係る吸音遮熱カバーは、上記無機繊維マット上に（図１や図２に示す例において符号４で示す）遮熱金属板を積層してなるものである。 The sound absorbing and heat insulating cover according to the present invention is formed by laminating a heat insulating metal plate (indicated by reference numeral 4 in the examples shown in FIGS. 1 and 2) on the inorganic fiber mat.
　本発明に係る吸音遮熱カバーにおいて、遮熱金属板としては、耐熱性を有する金属板からなるものを挙げることができる。
　上記金属板の構成材料は、上述した防音用金属板と同様の材料を挙げることができ、具体的には、アルミニウム、ステンレス鋼、アルミニウム合金、チタン、ニッケル、金、銀、銅、鉄、モリブデン等から選ばれる一種以上が挙げられ、軽量化が求められる場合はアルミニウムが好ましく、耐腐食性が求められる場合はステンレス鋼が好ましい。 In the sound absorbing and heat insulating cover according to the present invention, examples of the heat insulating metal plate include those made of a heat-resistant metal plate.
Examples of the constituent materials of the metal plate include the same materials as those of the above-mentioned soundproof metal plate. Specifically, aluminum, stainless steel, aluminum alloy, titanium, nickel, gold, silver, copper, iron, and molybdenum. When weight reduction is required, aluminum is preferable, and when corrosion resistance is required, stainless steel is preferable.
　遮熱金属板の厚みも、特に制限されないが、所望の耐熱性（遮熱性）を発揮する上では、通常、０．１～１．０ｍｍであることが好ましく、０．１～０．６ｍｍであることがより好ましく、０．３～０．４ｍｍであることがさらに好ましい。 The thickness of the heat-shielding metal plate is also not particularly limited, but is usually preferably 0.1 to 1.0 mm, preferably 0.1 to 0.6 mm, in order to exhibit the desired heat resistance (heat-shielding property). More preferably, it is more preferably 0.3 to 0.4 mm.
　遮熱金属板の形状も特に制限されないが、通常、上述した防音用金属板が、被覆対象物に対応した形状を有することから、遮熱金属板としても、防音用金属板に対応した形状を有するものであることが好ましい。
　遮熱金属板が防音用金属板に対応した形状を有することにより、遮熱金属板および防音用金属板を一定距離離間させた状態で容易に保持することができ、吸音遮熱カバー全体の防音性能および耐熱性を容易に均一化することができる。 The shape of the heat-shielding metal plate is also not particularly limited, but usually, since the above-mentioned sound-insulating metal plate has a shape corresponding to the object to be coated, the heat-shielding metal plate may have a shape corresponding to the sound-insulating metal plate. It is preferable to have.
Since the heat insulating metal plate has a shape corresponding to the soundproof metal plate, the heat insulating metal plate and the soundproof metal plate can be easily held at a certain distance from each other, and the soundproofing of the entire sound absorbing and heat insulating cover can be easily held. Performance and heat resistance can be easily uniformed.
　本発明に係る吸音遮熱カバーにおいて、遮熱金属板はその表面に（図１や図２に示す例において符号ｂで示す）複数の貫通孔を有している。 In the sound absorbing and heat insulating cover according to the present invention, the heat insulating metal plate has a plurality of through holes (indicated by reference numeral b in the examples shown in FIGS. 1 and 2) on its surface.
　図２に例示するように、本発明に係る吸音遮熱カバー１においては、遮熱金属板４が表面に複数の貫通孔ｂを有することにより、例えばエンジンルームの壁面等で反射した音ｓ２が遮熱金属板４の上面側から下面側に通過する際に、吸音遮熱カバー１の内部に取り込みやすくなり、貫通孔ｂを介して吸音遮熱カバー１内部に伝搬した音のエネルギーが、吸音遮熱カバー１内部に設けた無機繊維マット３によってマットを構成する繊維の振動エネルギーに変換され、吸音されることにより、防音性能を好適に発揮することができる。 As illustrated in FIG. 2, in the sound absorbing and heat insulating cover 1 according to the present invention, the heat insulating metal plate 4 has a plurality of through holes b on the surface, so that the sound s2 reflected by, for example, the wall surface of the engine room is generated. When passing from the upper surface side to the lower surface side of the heat shield metal plate 4, it becomes easier to take in the inside of the sound absorption heat shield cover 1, and the energy of the sound propagated inside the sound absorption heat shield cover 1 through the through hole b is the sound absorption. The inorganic fiber mat 3 provided inside the heat shield cover 1 converts the vibration energy of the fibers constituting the mat into sound absorption, so that the soundproofing performance can be suitably exhibited.
　遮熱金属板に設けられる貫通孔の孔形状は特に制限されず、上面視したときに、開孔部形状が、例えば、円形状、楕円形状または多角形状であることが好ましく、円形状であることがより好ましい。
　遮熱金属板に設けられる貫通孔の全体形状も特に制限されず、円柱状、多角柱状または円錐台状であることが好ましい。 The hole shape of the through hole provided in the heat shield metal plate is not particularly limited, and the shape of the opening portion is preferably circular, elliptical or polygonal, for example, when viewed from above. Is more preferable.
The overall shape of the through hole provided in the heat shield metal plate is also not particularly limited, and is preferably columnar, polygonal columnar, or truncated cone.
　本発明に係る吸音遮熱カバーにおいて、上記遮熱金属板に設けた貫通孔が上面視したときに円形状である場合、貫通孔の孔径は、０．１～３．０ｍｍであることが好ましく、０．１～２．０ｍｍであることがより好ましく、０．１～０．５ｍｍであることがさらに好ましい。 In the sound absorbing and heat insulating cover according to the present invention, when the through hole provided in the heat insulating metal plate has a circular shape when viewed from above, the hole diameter of the through hole is preferably 0.1 to 3.0 mm. , 0.1 to 2.0 mm, more preferably 0.1 to 0.5 mm.
　上記遮熱金属板に設けた貫通孔の孔径は、遮熱金属板の表面の１０個の貫通孔をマイクロスコープ（（株）キーエンス、ＶＨＸ－５００）で観察し、測定した各貫通孔の周囲長に相当する周囲長を有する円の直径を求めたときの算術平均値を意味する。 The diameter of the through holes provided in the heat shield metal plate is such that 10 through holes on the surface of the heat shield metal plate are observed with a microscope (Keyence Co., Ltd., VHX-500) and measured around each through hole. It means the arithmetic mean value when the diameter of a circle having a peripheral length corresponding to the length is calculated.
　本発明に係る吸音遮熱カバーにおいて、上記遮熱金属板に設ける各貫通孔の開孔面積は、０．０１～７．１ｍｍ２であることが好ましく、０．０１～３．２ｍｍ２であることがより好ましく、０．０１～０．２ｍｍ２であることがさらに好ましい。 In the sound absorbing and heat insulating cover according to the present invention, the opening area of each through hole provided in the heat insulating metal plate is preferably 0.01 to 7.1 mm 2 , preferably 0.01 to 3.2 mm 2 . More preferably, it is more preferably 0.01 to 0.2 mm 2 .
　本出願において、遮熱金属板に設けた貫通孔の開孔面積は、遮熱金属板の主表面を、マイクロスコープで観察して全ての貫通孔の周囲長を各々測定し、測定した各周囲長に相当する周囲長を有する円を求めた上で、係る円の面積を個々に算出し、その算術平均値を求めることによって得た値を意味する。 In the present application, the opening area of the through holes provided in the heat shield metal plate is determined by observing the main surface of the heat shield metal plate with a microscope and measuring the perimeters of all the through holes. It means a value obtained by finding a circle having a perimeter corresponding to the length, calculating the area of the circle individually, and finding the arithmetic average value thereof.
　本発明に係る吸音遮熱カバーにおいては、遮熱金属板に設けた貫通孔の開孔面積が上記範囲内にあることにより、例えばエンジンルームの壁面等で反射した音が遮熱金属板の上面側から下面側に通過する際に、吸音遮熱カバーの内部に容易に取り込むことができる。 In the sound absorbing and heat insulating cover according to the present invention, since the opening area of the through hole provided in the heat insulating metal plate is within the above range, for example, the sound reflected by the wall surface of the engine room or the like is reflected on the upper surface of the heat insulating metal plate. When passing from the side to the lower surface side, it can be easily taken into the inside of the sound absorbing / heat insulating cover.
　また、本発明に係る吸音遮熱カバーにおいて、上記遮熱金属板の開孔率は、０．０１～２０％であることが好ましく、０．０１～１０％であることがより好ましく、０．０１～１％であることがさらに好ましい。 Further, in the sound absorbing and heat insulating cover according to the present invention, the opening rate of the heat insulating metal plate is preferably 0.01 to 20%, more preferably 0.01 to 10%, and 0. It is more preferably 01 to 1%.
　本出願において、上記遮熱金属板の開孔率は、上述した方法により求めた全ての貫通孔の開孔面積および遮熱金属板の片側主表面積から、下記式　
　開孔率（％）＝｛遮熱金属板に設けた各貫通孔の開口面積の総和（ｍｍ２）／遮熱金属板の片側主表面積（ｍｍ２）｝×１００
により算出される値を意味する。 In the present application, the opening rate of the heat-shielding metal plate is calculated by the following formula from the opening areas of all the through holes and the main surface area on one side of the heat-shielding metal plate obtained by the above method.
Opening rate (%) = {total opening area of each through hole provided in the heat shield metal plate (mm 2 ) / main surface area on one side of the heat shield metal plate (mm 2 )} × 100
Means the value calculated by.
  遮熱金属板表面に設ける複数の貫通孔の配置についても特に限定されず、遮熱金属板全体にできる限り均等に配置することが好ましい。 The arrangement of the plurality of through holes provided on the surface of the heat shield metal plate is not particularly limited, and it is preferable to arrange them as evenly as possible on the entire heat shield metal plate.
　本発明に係る吸音遮熱カバーにおいて、防音用金属板と遮熱金属板との離間距離は、０．５～２０ｍｍであることが好ましく、１．５～１５ｍｍであることがより好ましく、３～１０ｍｍであることがさらに好ましい。 In the sound absorbing and heat insulating cover according to the present invention, the separation distance between the soundproof metal plate and the heat insulating metal plate is preferably 0.5 to 20 mm, more preferably 1.5 to 15 mm, and 3 to 3 to. It is more preferably 10 mm.
　本発明に係る吸音遮熱カバーにおいて、防音用金属板、無機繊維マットおよび遮熱金属板を固定する方法は、特に制限されず、従来公知の方法により固定することができる。例えば、遮熱金属板および防音用金属板の対応する位置に各々設けられた挿通孔に挿通された支柱部材を少なくも有する連結具により、上記遮熱金属板と防音用金属板とを離間しつつ保持することが好ましい。 In the sound absorbing and heat insulating cover according to the present invention, the method of fixing the soundproof metal plate, the inorganic fiber mat and the heat insulating metal plate is not particularly limited, and can be fixed by a conventionally known method. For example, the heat-shielding metal plate and the sound-insulating metal plate are separated from each other by a connecting tool having at least a support member inserted into the insertion holes provided at the corresponding positions of the heat-shielding metal plate and the sound-insulating metal plate. It is preferable to hold it while holding it.
　本発明に係る吸音遮熱カバーは、厚さが０．７～２２ｍｍであることが好ましく、１．７～１６．２ｍｍであることがより好ましく、３．６～１０．８ｍｍであることがさらに好ましい。
　本発明に係る吸音遮熱カバーは、厚さが薄くても十分な吸音性および遮熱性を発揮することができる。 The sound absorbing and heat insulating cover according to the present invention preferably has a thickness of 0.7 to 22 mm, more preferably 1.7 to 16.2 mm, and further preferably 3.6 to 10.8 mm. preferable.
The sound absorbing and heat insulating cover according to the present invention can exhibit sufficient sound absorbing and heat insulating properties even if the thickness is thin.
　本発明に係る吸音遮熱カバーは、防音用金属板が被覆対象物に対向するように配置して使用される。上記被覆対象物としては、例えば自動車エンジンを挙げることができる。
　本発明に係る吸音遮熱カバーは、例えば、従来の自動車エンジン用防音カバーに代わる自動車エンジン用吸音遮熱カバーとして好適に使用することができる。
　本発明に係る吸音遮熱カバーを自動車エンジン用吸音遮熱カバーとして使用する場合、例えば、エンジンの排気側壁面および上面の少なくとも一部に配置することにより、好適な吸音特性を容易に発揮することができる。 The sound absorbing and heat insulating cover according to the present invention is used by arranging the soundproof metal plate so as to face the object to be coated. Examples of the object to be covered include an automobile engine.
The sound absorbing and heat insulating cover according to the present invention can be suitably used, for example, as a sound absorbing and heat insulating cover for an automobile engine instead of a conventional sound insulating cover for an automobile engine.
When the sound absorbing and heat insulating cover according to the present invention is used as a sound absorbing and heat insulating cover for an automobile engine, for example, by arranging it on at least a part of the exhaust side wall surface and the upper surface of the engine, suitable sound absorbing characteristics can be easily exhibited. Can be done.
　本発明によれば、被覆対象物上に、吸音遮熱カバーとして防音用金属板と無機繊維マットと遮熱金属板とを順次積層したものを載置するとともに、上記防音用金属板および遮熱金属板の表面に複数の貫通孔を設けることにより、内部（被覆対象物）側から発せられた音が無機繊維マットで吸収され易くなるとともに、外部側から侵入する音も無機繊維マットで吸収され易くなる。また、吸音遮熱カバーとして防音用金属板と無機繊維マットと遮熱金属板とを順次積層した耐熱性に優れたものを採用するとともに、上記防音用金属板に設けた各貫通孔の開口面積を一定範囲内に抑制することにより、内部（被覆対象物）側から無機繊維マットへの対流による熱の伝導を抑制し優れた遮熱性を発揮することができる。
　このため、本発明によれば、十分な防音性能を有するとともに耐熱性および遮熱性に優れた新規な吸音遮熱カバーを提供することができる。 According to the present invention, a soundproofing metal plate, an inorganic fiber mat, and a heat insulating metal plate are sequentially laminated as a sound absorbing and heat insulating cover on a covering object, and the soundproofing metal plate and the heat insulating metal plate are placed. By providing a plurality of through holes on the surface of the metal plate, the sound emitted from the inside (covered object) side is easily absorbed by the inorganic fiber mat, and the sound invading from the outside side is also absorbed by the inorganic fiber mat. It will be easier. Further, as the sound absorbing and heat insulating cover, a sound insulating metal plate, an inorganic fiber mat, and a heat insulating metal plate are sequentially laminated to have excellent heat resistance, and the opening area of each through hole provided in the sound insulating metal plate is adopted. By suppressing the heat within a certain range, heat conduction due to convection from the inside (covered object) side to the inorganic fiber mat can be suppressed, and excellent heat shielding properties can be exhibited.
Therefore, according to the present invention, it is possible to provide a novel sound absorbing and heat insulating cover having sufficient soundproofing performance and excellent heat resistance and heat insulating property.
　次に、本発明に係るエンジンユニットについて説明する。
　本発明に係るエンジンユニットは、自動車用エンジンと当該自動車用エンジンの少なくとも一部を覆う本発明に係る吸音遮熱カバーとを有することを特徴とするものである。
　本発明に係るエンジンユニットにおいて、上記吸音遮熱カバーは、防音用金属板が自動車用エンジンの少なくとも一部に対向するように配置される。 Next, the engine unit according to the present invention will be described.
The engine unit according to the present invention is characterized by having an automobile engine and a sound absorbing and heat insulating cover according to the present invention that covers at least a part of the automobile engine.
In the engine unit according to the present invention, the sound absorbing and heat insulating cover is arranged so that the soundproof metal plate faces at least a part of the automobile engine.
　本発明に係るエンジンユニットにおいて、本発明に係る吸音遮熱カバーの詳細は上述したとおりである。
　また、本発明に係るエンジンユニットにおいて、自動車用エンジンやエンジンルームは、公知のものを適宜採用することができる。 In the engine unit according to the present invention, the details of the sound absorbing and heat insulating cover according to the present invention are as described above.
Further, in the engine unit according to the present invention, known ones can be appropriately adopted as the automobile engine and the engine room.
　本発明に係るエンジンユニットにおいて、エンジンユニット設置時における遮熱金属板とエンジンルームとの間の距離（遮熱金属板およびエンジンルームの壁面間に形成される隙間）は、０．１ｍｍ以上が好ましく、５ｍｍ以上がより好ましく、１０ｍｍ以上がさらに好ましい。 In the engine unit according to the present invention, the distance between the heat shield metal plate and the engine room (the gap formed between the heat shield metal plate and the wall surface of the engine room) when the engine unit is installed is preferably 0.1 mm or more. 5 mm or more is more preferable, and 10 mm or more is further preferable.
　本発明に係るエンジンユニットは、本発明に係る吸音遮熱カバーを有するものであることにより、自動車エンジンから発生して防音用金属板を通過する音だけではなく、エンジンルームの壁面で反射し遮熱金属板を通過する音についても、無機繊維マットによって効率的に振動へ変換し、エネルギーを減衰することで、エンジンルーム内の音圧を好適に低減することができる。また、本発明に係るエンジンユニットは、吸音遮熱カバーとして防音用金属板と無機繊維マットと遮熱金属板とを順次積層した耐熱性に優れたものを採用するとともに、上記防音用金属板に設けた各貫通孔の開口面積を一定範囲内に抑制することにより、内部（被覆対象物）側から無機繊維マットへの対流による熱の伝導を抑制し優れた遮熱性を発揮することができる。
　このため、本発明によれば、耐熱性を有し、厚さが薄くても十分な防音性能を有する吸音遮熱カバーを有する新規なエンジンユニットを提供することができる。 Since the engine unit according to the present invention has the sound absorbing and heat insulating cover according to the present invention, not only the sound generated from the automobile engine and passing through the soundproof metal plate but also reflected and shielded by the wall surface of the engine room. The sound passing through the thermometal plate is also efficiently converted into vibration by the inorganic fiber mat, and the energy is attenuated, so that the sound pressure in the engine room can be suitably reduced. Further, the engine unit according to the present invention adopts a sound absorbing and heat insulating cover having excellent heat resistance in which a sound insulating metal plate, an inorganic fiber mat and a heat insulating metal plate are sequentially laminated, and is used as the sound insulating metal plate. By suppressing the opening area of each of the provided through holes within a certain range, heat conduction due to convection from the inside (covered object) side to the inorganic fiber mat can be suppressed, and excellent heat shielding properties can be exhibited.
Therefore, according to the present invention, it is possible to provide a novel engine unit having a sound absorbing and heat insulating cover having heat resistance and sufficient soundproofing performance even if the thickness is thin.
　次に、実施例を挙げて、本発明を更に具体的に説明するが、これは単に例示であって、本発明を制限するものではない。 Next, the present invention will be described in more detail with reference to examples, but this is merely an example and does not limit the present invention.
（実施例１）
（１）防音用金属板として、縦０．５ｍ、横０．５ｍ（主表面積０．２５ｍ２）になるように切り出したアルミニウム板（厚さ０．３ｍｍ）に孔加工を施した金属板（孔径１．０ｍｍ、開口面積０．８ｍｍ２、開孔率０．９０％）と、（２）無機繊維マットとして、縦０．５ｍ、横０．５ｍ（主表面積０．２５ｍ２）になるように切り出したガラスマット（嵩密度０．１ｇ/ｃｍ３、厚さ６ｍｍ）と、（３）遮熱用金属板として、縦０．５ｍ、横０．５ｍ（主表面積０．２５ｍ２）になるように切り出したアルミニウム板（厚さ０．３ｍｍ）に孔加工を施した金属板（孔径０．５ｍｍ、開口面積０．２ｍｍ２、開孔率０．２０％）とを、この順番で順次配置して、厚さ６．６ｍｍの吸音遮熱カバーを得た。 (Example 1)
(1) As a soundproof metal plate, a metal plate (thickness 0.3 mm) cut out so as to have a length of 0.5 m and a width of 0.5 m (main surface area 0.25 m 2 ) is perforated (thickness 0.3 mm). Pore diameter 1.0 mm, opening area 0.8 mm 2 , pore opening rate 0.90%) and (2) as an inorganic fiber mat, the length is 0.5 m and the width is 0.5 m (main surface area 0.25 m 2 ). A glass mat (bulk density 0.1 g / cm 3 , thickness 6 mm) cut out into a glass mat (bulk density 0.1 g / cm 3, thickness 6 mm) and (3) a metal plate for heat shielding, 0.5 m long and 0.5 m wide (main surface area 0.25 m 2 ). A metal plate (hole diameter 0.5 mm, opening area 0.2 mm 2 , opening rate 0.20%) having holes processed in the aluminum plate (thickness 0.3 mm) cut out in this manner is sequentially arranged in this order. Then, a sound absorbing and heat insulating cover having a thickness of 6.6 mm was obtained.
（吸音性評価）
　実施例１で得られた吸音遮熱カバーを測定サンプルとし、日本音響エンジニアリング（株）製残響室Ａｂ－Ｌｏｓｓを用いて吸音性を評価した。
　図３に垂直断面で示すように、防音用金属板２と、無機繊維マット３と、遮熱金属板４とをこの順番で積層した上記吸音遮熱カバー１を、上記防音用金属板２が上部側に露出するように床面ｆ上に長さ１０ｍｍのスペーサーｓを介して配置し（背後空気層Ａを１０ｍｍ設けた状態とし）、上記吸音遮熱カバー１の両側面に各々Ｌ字状のアルミ製アングルＬでシールした状態において、吸音率（残響室法吸音率）を測定した。
　吸音率は、防音用金属板の上部側から音Ｎを入射させたときに４００Ｈｚ～１０００Ｈｚの範囲におけるＩＳＯ３５４（２００３）に基づくインパルス応答積分法を用いて測定した。結果を図４および表１に示す。 (Sound absorption evaluation)
The sound absorbing and heat insulating cover obtained in Example 1 was used as a measurement sample, and the sound absorbing property was evaluated using the reverberation room Ab-Loss manufactured by Nippon Acoustic Engineering Co., Ltd.
As shown in a vertical cross section in FIG. 3, the soundproofing metal plate 2 forms the sound absorbing and heat insulating cover 1 in which the soundproofing metal plate 2, the inorganic fiber mat 3, and the heat insulating metal plate 4 are laminated in this order. It is arranged on the floor surface f via spacers s having a length of 10 mm so as to be exposed on the upper side (with the back air layer A provided by 10 mm), and L-shaped on both side surfaces of the sound absorbing and heat insulating cover 1. The sound absorption coefficient (reverberation chamber method sound absorption coefficient) was measured in a state of being sealed with the aluminum angle L of.
The sound absorption coefficient was measured by using an impulse response integration method based on ISO354 (2003) in the range of 400 Hz to 1000 Hz when sound N was incident from the upper side of the soundproof metal plate. The results are shown in FIG. 4 and Table 1.
（遮熱性評価）
　実施例１で得られた吸音遮熱カバーを測定サンプルとし、以下に示す方法により遮熱性を評価した。
　図５に垂直断面で示すように、防音用金属板２と、無機繊維マット３と、遮熱金属板４とをこの順番で積層した上記吸音遮熱カバー１を、上記防音用金属板２が上部側に露出するように床面ｆ上に長さ１０ｍｍのスペーサーｓを介して配置し（背後空気層Ａを１０ｍｍ設けた状態とし）、上記吸音遮熱カバー１の両側面に熱源として各々ヒーターＨを配置した。
　室温（２０℃）条件下、上記ヒーターＨ．Ｈにより吸音遮熱カバー１を７００℃で３０分間加熱したときに、吸音遮熱カバー１の上面から２０ｃｍ上部における温度を測定したところ、５４℃であった。結果を表１に示す。 (Evaluation of heat insulation)
The sound absorbing and heat insulating cover obtained in Example 1 was used as a measurement sample, and the heat insulating property was evaluated by the method shown below.
As shown in a vertical cross section in FIG. 5, the soundproofing metal plate 2 forms the sound absorbing and heat insulating cover 1 in which the soundproofing metal plate 2, the inorganic fiber mat 3, and the heat insulating metal plate 4 are laminated in this order. A 10 mm long spacer s is placed on the floor surface f so as to be exposed on the upper side (with a back air layer A of 10 mm provided), and heaters are used as heat sources on both side surfaces of the sound absorbing and heat insulating cover 1. H was placed.
Under the condition of room temperature (20 ° C.), the above heater H. When the sound absorbing and heat insulating cover 1 was heated at 700 ° C. for 30 minutes by H, the temperature 20 cm above the upper surface of the sound absorbing and heat insulating cover 1 was measured and found to be 54 ° C. The results are shown in Table 1.
（実施例２）
　実施例１において、（１）防音用金属板の孔径を０．５ｍｍ、開口面積を０．２ｍｍ２、開孔率を０．０６％に変更した以外は、実施例1と同様にして厚さ６．６ｍｍの吸音遮熱カバーを得、実施例１と同様にして吸音性を評価した。結果を図４に示す。 (Example 2)
In Example 1, the thickness was the same as in Example 1 except that (1) the hole diameter of the soundproof metal plate was changed to 0.5 mm, the opening area was changed to 0.2 mm 2 , and the opening ratio was changed to 0.06%. A 6.6 mm sound absorbing and heat insulating cover was obtained, and the sound absorbing property was evaluated in the same manner as in Example 1. The results are shown in FIG.
（実施例３）
　実施例１において、（１）防音用金属板の孔径を２．０ｍｍ、開口面積を３．１ｍｍ２、開孔率を０．２３％に変更した以外は、実施例1と同様にして厚さ６．６ｍｍの吸音遮熱カバーを得、実施例１と同様にして吸音性を評価した。結果を図４に示す。 (Example 3)
In Example 1, the thickness was the same as in Example 1 except that (1) the hole diameter of the soundproof metal plate was changed to 2.0 mm, the opening area was changed to 3.1 mm 2 , and the opening ratio was changed to 0.23%. A 6.6 mm sound absorbing and heat insulating cover was obtained, and the sound absorbing property was evaluated in the same manner as in Example 1. The results are shown in FIG.
（実施例４）
　実施例１において、（１）防音用金属板の孔径を３．０ｍｍ、開口面積を７．１ｍｍ２、開孔率を８．００％に変更した以外は、実施例1と同様にして厚さ６．６ｍｍの吸音遮熱カバーを得、実施例１と同様にして吸音性および遮熱性を評価した。結果を図４および表１に示す。 (Example 4)
In Example 1, the thickness was the same as in Example 1 except that (1) the hole diameter of the soundproof metal plate was changed to 3.0 mm, the opening area was changed to 7.1 mm 2 , and the opening ratio was changed to 8.00%. A 6.6 mm sound absorbing and heat insulating cover was obtained, and the sound absorbing property and the heat insulating property were evaluated in the same manner as in Example 1. The results are shown in FIG. 4 and Table 1.
（実施例５）
　実施例４において、（１）遮熱用金属板の孔径を１．０ｍｍ、開口面積を０．８ｍｍ２、開孔率を０．９０％に変更した以外は、実施例1と同様にして厚さ６．６ｍｍの吸音遮熱カバーを得、実施例１と同様にして遮熱性を評価した。結果を表１に示す。 (Example 5)
In Example 4, the thickness was the same as in Example 1 except that (1) the hole diameter of the heat shield metal plate was changed to 1.0 mm, the opening area was changed to 0.8 mm 2 , and the opening ratio was changed to 0.90%. A 6.6 mm sound absorbing and heat insulating cover was obtained, and the heat insulating property was evaluated in the same manner as in Example 1. The results are shown in Table 1.
（実施例６）
　実施例４において、（１）遮熱用金属板の孔径を２．０ｍｍ、開口面積を３．１ｍｍ２、開孔率を３．６０％に変更した以外は、実施例1と同様にして厚さ６．６ｍｍの吸音遮熱カバーを得、実施例１と同様にして遮熱性を評価した。結果を表１に示す。 (Example 6)
In Example 4, the thickness was the same as in Example 1 except that (1) the hole diameter of the heat shield metal plate was changed to 2.0 mm, the opening area was changed to 3.1 mm 2 , and the opening ratio was changed to 3.60%. A 6.6 mm sound absorbing and heat insulating cover was obtained, and the heat insulating property was evaluated in the same manner as in Example 1. The results are shown in Table 1.
（実施例７）
　実施例４において、（１）遮熱用金属板の孔径を３．０ｍｍ、開口面積を７．１ｍｍ２、開孔率を８．００％に変更した以外は、実施例1と同様にして厚さ６．６ｍｍの吸音遮熱カバーを得、実施例１と同様にして遮熱性を評価した。 (Example 7)
In Example 4, the thickness was the same as in Example 1 except that (1) the hole diameter of the heat shield metal plate was changed to 3.0 mm, the opening area was changed to 7.1 mm 2 , and the opening ratio was changed to 8.00%. A 6.6 mm sound absorbing and heat insulating cover was obtained, and the heat insulating property was evaluated in the same manner as in Example 1.
（比較例１）
　金属板として、縦０．５ｍ、横０．５ｍ（主表面積０．２５ｍ２）になるように切り出したアルミニウム板（厚さ０．３ｍｍ）を得、吸音遮熱カバーに代えて上記金属板を用いた以外は実施例１と同様にして吸音性および遮熱性を評価した。結果を図４および表１に示す。 (Comparative Example 1)
As a metal plate, an aluminum plate (thickness 0.3 mm) cut out so as to have a length of 0.5 m and a width of 0.5 m (main surface area of 0.25 m 2 ) was obtained, and the above metal plate was used instead of the sound absorbing and heat insulating cover. Sound absorption and heat insulation were evaluated in the same manner as in Example 1 except that they were used. The results are shown in FIG. 4 and Table 1.
（比較例２）
　無機繊維マットとして、縦０．５ｍ、横０．５ｍ（主表面積０．２５ｍ２）になるように切り出したガラスマット（嵩密度０．１ｇ/ｃｍ3、厚さ６ｍｍ）を得、吸音遮熱カバーに代えて上記無機繊維マットを用いた以外は実施例１と同様にして吸音性および遮熱性を評価した。結果を図４および表１に示す。 (Comparative Example 2)
As an inorganic fiber mat, a glass mat (bulk density 0.1 g / cm 3 , thickness 6 mm) cut out to a length of 0.5 m and a width of 0.5 m (main surface area 0.25 m 2 ) was obtained, and sound absorption and heat insulation were obtained. The sound absorption and heat insulation were evaluated in the same manner as in Example 1 except that the inorganic fiber mat was used instead of the cover. The results are shown in FIG. 4 and Table 1.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　図４および表１より、実施例１～実施例７で得られた吸音遮熱カバーは、とともに、図４より、低周波領域である４００～１０００Ｈｚ程度の周波数帯における音圧の抑制効果に優れるとともに、耐熱性および遮熱性に優れたものであることが分かる。
　一方、図４および表１より、比較例１および比較例２で各々得られた金属板および無機繊維マットは、いずれも、低周波領域である４００～１０００Ｈｚ程度の周波数帯における音圧を十分に抑制し得ず、また、十分な遮熱性を有さないものであることが分かる。 From FIG. 4 and Table 1, the sound absorbing and heat insulating covers obtained in Examples 1 to 7 are also excellent in the sound pressure suppressing effect in the frequency band of about 400 to 1000 Hz, which is a low frequency region, as shown in FIG. At the same time, it can be seen that it is excellent in heat resistance and heat shielding property.
On the other hand, from FIG. 4 and Table 1, the metal plates and the inorganic fiber mats obtained in Comparative Example 1 and Comparative Example 2, respectively, sufficiently have a sufficient sound pressure in the frequency band of about 400 to 1000 Hz, which is a low frequency region. It can be seen that it cannot be suppressed and does not have sufficient heat shielding properties.
　本発明によれば、十分な防音性能を有するとともに耐熱性および遮熱性に優れた新規な吸音遮熱カバーおよび係る吸音遮熱カバーを有するエンジンユニットを提供することができる。 According to the present invention, it is possible to provide an engine unit having a new sound absorbing and heat insulating cover having sufficient soundproofing performance and excellent heat resistance and heat insulating property, and such a sound absorbing and heat insulating cover.
１　　　吸音遮熱カバー
２　　　防音用金属板
３　　　無機繊維マット
４　　　遮熱金属板
ｂ、ｐ　貫通孔
Ａ　　　背後空気層
ｓ　　　スペーサー
Ｌ　　　アルミ製アングル
ｆ　　　床
Ｈ　　　ヒーター

  1 Sound absorption and heat insulation cover 2 Sound insulation metal plate 3 Inorganic fiber mat 4 Heat insulation metal plate b, p Through hole A Back air layer s Spacer L Aluminum angle f Floor H Heater

Claims (7)

  1. 　表面に複数の貫通孔を有する防音用金属板と、無機繊維マットと、表面に複数の貫通孔を有する遮熱金属板とをこの順番で積層した吸音遮熱カバーであって、
    　前記防音用金属板に設けた各貫通孔の開孔面積が０．０１～７．１ｍｍ２である
    ことを特徴とする吸音遮熱カバー。     A sound absorbing and heat insulating cover in which a soundproof metal plate having a plurality of through holes on the surface, an inorganic fiber mat, and a heat insulating metal plate having a plurality of through holes on the surface are laminated in this order.
    A sound absorbing and heat insulating cover having an opening area of 0.01 to 7.1 mm 2 for each through hole provided in the soundproof metal plate.
  2. 　前記防音用金属板の開孔率が０．０１～２０％である請求項１に記載の吸音遮熱カバー。 The sound absorbing and heat insulating cover according to claim 1, wherein the opening rate of the soundproof metal plate is 0.01 to 20%.
  3. 　前記無機繊維マットが、ガラス繊維、アルミナ繊維、シリカ繊維およびロックウール繊維から選ばれる一種以上の無機繊維を含む請求項１に記載の吸音遮熱カバー。 The sound absorbing and heat insulating cover according to claim 1, wherein the inorganic fiber mat contains one or more inorganic fibers selected from glass fiber, alumina fiber, silica fiber and rock wool fiber.
  4. 　前記防音用金属板または遮熱金属板の厚さが０．１～１．０ｍｍである請求項１に記載の吸音遮熱カバー。 The sound absorbing and heat insulating cover according to claim 1, wherein the soundproof metal plate or the heat insulating metal plate has a thickness of 0.1 to 1.0 mm.
  5. 　厚さが０．７～２２ｍｍである請求項１に記載の吸音遮熱カバー。 The sound absorbing and heat insulating cover according to claim 1, which has a thickness of 0.7 to 22 mm.
  6. 　前記吸音遮熱カバーが自動車エンジン用吸音遮熱カバーである請求項１に記載の吸音遮熱カバー。 The sound absorbing and heat insulating cover according to claim 1, wherein the sound absorbing and heat insulating cover is a sound absorbing and heat insulating cover for an automobile engine.
  7. 　自動車用エンジンと当該自動車用エンジンの少なくとも一部を覆う請求項６に記載の吸音遮熱カバーとを有することを特徴とするエンジンユニット。

          An engine unit having an automobile engine and the sound absorbing and heat insulating cover according to claim 6, which covers at least a part of the automobile engine.
PCT/JP2021/001002 2020-01-17 2021-01-14 Sound-absorbing heat-shielding cover and engine unit WO2021145366A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115341995A (en) * 2022-08-31 2022-11-15 东风商用车有限公司 Engine flywheel housing sound-proof shield and preparation method thereof

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Publication number Priority date Publication date Assignee Title
JP2002180845A (en) * 2000-12-12 2002-06-26 Nichias Corp Soundproof cover for automobile engine
WO2003001501A1 (en) * 2001-06-21 2003-01-03 Kabushiki Kaisha Kobe Seiko Sho Porous soundproof structural body and method of manufacturing the structural body
JP2003022077A (en) * 2001-07-10 2003-01-24 Nippon Glass Fiber Kogyo Kk Soundproofing structure of equipment and soundproofing member

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Publication number Priority date Publication date Assignee Title
JP5892424B2 (en) 2012-04-06 2016-03-23 株式会社ニコン Image acquisition method, image acquisition device, and scanning microscope

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Publication number Priority date Publication date Assignee Title
JP2002180845A (en) * 2000-12-12 2002-06-26 Nichias Corp Soundproof cover for automobile engine
WO2003001501A1 (en) * 2001-06-21 2003-01-03 Kabushiki Kaisha Kobe Seiko Sho Porous soundproof structural body and method of manufacturing the structural body
JP2003022077A (en) * 2001-07-10 2003-01-24 Nippon Glass Fiber Kogyo Kk Soundproofing structure of equipment and soundproofing member

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115341995A (en) * 2022-08-31 2022-11-15 东风商用车有限公司 Engine flywheel housing sound-proof shield and preparation method thereof

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