WO1997021046A1

WO1997021046A1 - Vibration damping apparatus

Info

Publication number: WO1997021046A1
Application number: PCT/JP1996/002284
Authority: WO
Inventors: Eiichi Kakisako
Original assignee: Eiichi Kakisako
Priority date: 1995-12-04
Filing date: 1996-08-12
Publication date: 1997-06-12
Also published as: JP3465714B2

Abstract

A passive type vibration damping apparatus, effective particularly in a low-frequency region, having a simple structure provided integrally with a damper mechanism, which lowers the resonance frequency and amplitude of an object. The damping apparatus (1) comprises first and second damping units. The first damping unit (5), interposed between the primary and secondary sides of a vibration transmission path, includes a first cover (2) on either the primary and secondary side, a second cover (3) on the other side so as to be opposed to the first cover, and a viscoelastic member (4) between the first and second covers so as to interconnect them, wherein the vibration energy transmitted from the first or second cover is absorbed by the shear of the viscoelastic member. The second vibration unit (6, 9, 10, 17), provided in the first or second cover so as to urge these two covers elastically in opposite directions includes an elastic member adapted to absorb the vibration energy, which is transmitted thereto from the first or second cover, by being deformed in the vibration transmission direction.

Description

Specification

Vibration energy absorber

Technical field

The present invention relates to, for example, dampers for floors and bridges of buildings, dampers for precision measuring instruments and machine tools, and various other vibration generating devices, or housing-related devices and other vibration damping and vibration damping objects. The present invention relates to a passive energy absorbing device that is mounted on a pedestal, a leg or the like to perform vibration isolation, vibration suppression, or shock mitigation. Background art

Conventionally, devices that generate vibration or precision instrumentation devices that dislike vibration are provided with a vibration energy absorbing device during installation to take measures against vibration and vibration. A typical example of this type of vibration isolator / vibration damper is a vibration damping mechanism that absorbs vibration energy by interposing synthetic rubber from the secondary side to the secondary side of the vibration transmission path, and absorbing the compressive deformation. Provided devices are widely known. In addition to this, as a passive type, a spring is used to insulate the transmission of vibration from the primary side so that vibration energy is not transmitted to the secondary side, so that hydraulic or pneumatic or viscous liquid is used. A device equipped with a damping mechanism separately provided with a sealed damper device S is known.

However, according to the conventional method of damping vibration by using only a synthetic rubber in the vibration transmission path as a conventional vibration damping device and vibration damping device, in general, a vibration-proof rubber with a lower spring constant is better. However, if the resonance amplitude of the supported object is too large due to the weight fluctuation of the support body or temporary large load input, impact force, etc., there will be a problem of interference with peripheral devices and installations. Therefore, the lower limit is naturally regulated by the spring constant. Also, rubber materials generally have the undesirable properties of being soft at large amplitudes, low frequencies, and stiff at small amplitudes, high frequencies. Originally, it is preferable to use a synthetic rubber that can keep the resonance frequency low and also reduce the resonance amplitude of the vibration-damping / damping object. There is still room for improvement in the use of vibration energy to absorb vibration energy, especially for low-frequency vibrations. None as far as we know. In terms of lowering the resonance frequency by lowering the spring constant, it is effective to use a coil spring that can easily obtain extremely accurate spring characteristics based on the design theory and that it is interposed in the vibration transmission path. . However, in this case, although vibration can be eliminated, there is a problem that there is no damping force because the free vibration of the coil does not stop. In order to absorb the vibration energy by interposing the coil spring in the vibration transmission path while supplementing this damping force, a damper device filled with hydraulic, pneumatic or viscous liquid, or a damper using rubber hysteresis is used. It is necessary to add a separate device. For this reason, the structure of the device is inevitably complicated, and there is a disadvantage that the cost is disadvantageous. Therefore, research has been conducted into a device in which a damper mechanism for suppressing the free vibration of the coil spring and the coil spring is integrally housed in the same device. However, as far as the inventor can know, such a vibration energy is absorbed. There are no devices. Disclosure of the invention

The present invention has been developed in view of the above-described circumstances, and the present invention has a simple structure in which a resonance frequency is kept low and a damper mechanism is integrally provided in the same device. An object of the present invention is to provide a passive-type vibration energy absorbing device that can reduce the resonance amplitude of an object to be damped, and can obtain a vibration damping effect particularly in a low frequency region.

As a specific means for achieving this object, the vibration energy absorbing device of the present invention is interposed between the primary side and the secondary side of the vibration transmission path, and one of the primary side and the secondary side The first cover body is disposed opposite to the second cover body, and the other cover body is interposed between the first and second cover bodies, and the two cover bodies are attached to each other, so that the first cover body is transmitted from the first or second cover body. A first vibration absorbing section provided with a viscoelastic layer that absorbs the vibration energy to be applied by shear deformation, and an elastic section provided in the first or second cover body and elastically moved away from the two cover bodies. And a second vibration absorbing section including an elastic body that absorbs the vibration energy transmitted from the first or second cover by integral deformation in the vibration transmitting direction. Features.

In other words, this vibration energy absorbing device uses a pressure that absorbs vibration by compressive deformation. Since the compression type vibration absorbing section, that is, the second vibration absorbing section, and the shear type vibration absorbing section, that is, the first vibration absorbing section that absorbs the vibration due to the shear deformation, are provided in parallel, the second vibration absorbing section is provided. The resonance frequency can be suppressed to a low level by the section, and the resonance amplitude of the object to be subjected to vibration control and vibration suppression can be greatly reduced by the first vibration absorbing section. Therefore, the first vibration absorbing section and the second vibration absorbing section are integrally incorporated in the same device, have a very simple structure, and have a low-frequency attenuation effect. The vibration energy can be absorbed by the pump.

In addition, the viscoelastic material of the first vibration absorbing portion has a damper function for the second vibration absorbing portion in the sense that the resonance amplitude of the vibration damping / damping target can be reduced. In other words, the shear deformation of the viscoelastic body makes it possible to effectively suppress free vibration of the second vibration absorber. As a result, the damping force of the second vibration absorber, which is a problem when the panel constant is set low, can be compensated for, and especially in the low frequency region, a large attenuation coefficient is obtained by obtaining a characteristic with a large resonance coefficient and a small resonance amplitude. The effect can be obtained. Further, the viscoelastic material acts more effectively in preventing surging or buckling when an eccentric load is applied to the second vibration absorbing portion, particularly the coil spring.

Further, it is more preferable that the above-mentioned vibration energy absorbing device uses a coil spring as an elastic body of the second vibration absorbing portion. In other words, a coil spring can obtain extremely accurate spring characteristics based on its design theory and is easy to manufacture, so that the panel constant can be specified freely and the resonance frequency can be set intentionally. It is. In addition, the use of a coil spring makes it possible to cover the disadvantage of the viscoelastic body, which has a poor supporting force.

Further, the vibration energy absorbing device is in a state in which a preliminary load for canceling a load applied to the viscoelastic material by the vibration-proof / vibration-controlling object is applied to the second vibration absorbing unit. In other words, since a smaller preliminary load is applied to the second vibration energy absorbing section than the load imposed by the vibration damping and vibration damping object, the vibration The loading load can be almost unloaded. Therefore, if the damping effect due to shear deformation is high, the characteristics of the viscoelastic body can be sufficiently exhibited. In addition, the vibration energy absorbing device of the present invention is characterized in that at least one or more auxiliary cover members are combined between the first cover integral and the second cover integral, and between the first cover and the auxiliary cover integral, The first vibration absorbing portion is formed by joining the cover body and the auxiliary cover body with a viscoelastic body, respectively.

As described above, while the auxiliary cover body is joined to the first cover body by the viscoelastic body, it is also joined to the second cover body by the viscoelastic body. With this arrangement, an appropriate damper effect of the viscoelastic body can be significantly obtained. Needless to say, the auxiliary cover is not necessarily provided as a single unit, but may be provided with a plurality of viscoelastic materials interposed between the first cover and the second cover. Since the first vibration absorber has a structure in which a plurality of viscoelastic materials are provided in series, a larger displacement of the viscoelastic body can be obtained. Therefore, it is possible to more effectively obtain the damping effect in the low frequency region, and it is possible to greatly reduce the resonance amplitude of the vibration damping / damping target.

Further, in the vibration energy absorbing device of the present invention, the viscoelastic material of the first vibration absorbing section is formed by forming a viscoelastic body in a laminated shape. In other words, by increasing or decreasing the thickness as well as the used area of the viscoelastic body, the spring constant and displacement can be adjusted intentionally, and the attenuation in the low frequency region can be amplified. . In addition, by increasing the thickness of the viscoelastic body by forming a multilayer structure, even when an eccentric load is applied to the second vibration absorbing portion, vibration energy is absorbed by compressive deformation of the viscoelastic body having the laminated structure. It is also possible to do.

The vibration energy absorbing device according to the present invention includes: a second vibration absorbing portion including an elastic body for absorbing vibration; a load receiving portion fixed to an upper surface of the second vibration absorbing portion and receiving a load of an object; A fixing member fixed to a base supporting the second vibration absorbing portion and positioned on a side of the second vibration absorbing portion; and a gap provided outside the fixing member and fixed to the load receiving portion. A second vibration absorbing portion including a cover, and a viscoelastic body in which the cover and the fixing member are joined at the gap.

In other words, the vibration energy absorbing device of the present invention performs the vibration absorption by the compression type vibration absorbing portion, that is, the second vibration absorbing portion, which absorbs the vibration by the compressive deformation, and the vibration absorption by the shearing deformation. Since the shear-type vibration absorbing section, that is, the first vibration absorbing section is provided in parallel, the resonance frequency can be suppressed low in the second vibration absorbing section, and at the same time, the vibration is prevented in the first vibration absorbing section. * Resonant amplitude of the object to be damped can be greatly reduced. Therefore, the first vibration absorbing section and the second vibration absorbing section have a very simple structure in which they are integrated into the same device, and a passive type vibration energy that can obtain an attenuation effect in a low frequency region. It can be an absorption device.

In addition, the viscoelastic material of the first vibration absorbing portion has a damper function for the second vibration absorbing portion in the sense that the resonance amplitude of the vibration damping / damping target can be reduced. In other words, the shear deformation of the viscoelastic body makes it possible to effectively suppress free vibration of the second vibration absorber. As a result, it is possible to supplement the damping force of the second vibration absorbing portion, which is a problem in the case where the spring constant is set low, and to obtain a damping effect particularly in a low frequency region. In addition, the viscoelastic material effectively acts in terms of preventing surging or backing when an eccentric load is applied to the second vibration absorbing portion, particularly the coil spring.

Further, it is more preferable that the vibration energy absorbing device of the present invention is configured such that either one of the first cover and the second cover is divided into a plurality. That is, workability in assembling the device can be improved.

Further, the first vibration absorbing portion of the vibration energy absorbing device according to the present invention further includes an auxiliary cover integrated on the outer periphery of the first cover body or the second cover body, and further includes an auxiliary cover provided between the cover body and the first vibration absorbing section. And a viscoelastic body attached to the base. That is, it is possible to amplify the damping force in the low frequency region by increasing the thickness of the viscoelastic body. The vibration energy absorbing device of the present invention is provided with a support for mounting the vibration damping * vibration damping object so as to penetrate the first cover integral and the second cover integral. A stopper is also provided, and a restricting portion for restricting the inclination of the support is provided integrally with the first cover and the second cover, and the penetrating protrusion is provided on the base where the support is inclined due to excessive vibration. The excessive inclination of the part is regulated by the regulation part.

In other words, when strong vibration or impact is applied to the vibration-damping / damping target, if the support that supports the vibration-damping / damping target becomes more inclined, the regulation hole of The contact with the peripheral side surface or the contact of the stopper with the peripheral portion of the regulating hole can regulate, for example, an excessive inclination of the support. Therefore, even if the vibration-damping / damping target is excessively tilted, it is possible to avoid an accident in which the vibration-damping / damping target falls down. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a sectional structural view of a first embodiment of a vibration energy absorbing device according to the present invention.

FIG. 2 is a plan view of a first embodiment of the vibration energy absorbing device according to the present invention.

FIG. 3 is a sectional structural view of a first embodiment of the vibration energy absorbing device according to the present invention.

FIG. 4 is a sectional structural view of a second embodiment of the vibration energy absorbing device according to the present invention.

FIG. 5 is a sectional structural view showing a third embodiment of the vibration energy absorbing device provided with the restricting portion according to the present invention.

FIG. 6 is a sectional structural view showing a third embodiment of the vibration energy absorbing device including the restricting portion according to the present invention.

FIG. 7 is a sectional structural view showing a fourth embodiment of the vibration energy absorbing device provided with the restricting portion according to the present invention.

FIG. 8 is a sectional structural view showing a fifth embodiment of the vibration energy absorbing device including the restricting portion according to the present invention.

FIG. 9 is an explanatory diagram showing an equivalent model of the fourth embodiment taken up as an experimental example of the present invention. Embodiment of the Invention

Hereinafter, various embodiments suitable for the present invention will be described with reference to FIG. 1 to FIG. In addition, the same reference numerals are used for members that are used in common in each embodiment, and descriptions that are the same as those in other embodiments are omitted. First embodiment>

A first embodiment of a vibration energy absorbing device according to the present invention will be described with reference to FIGS. 1, 2, and 3. FIG. The vibration energy absorbing device 1 according to the first embodiment has a viscoelastic structure in which a first cover body 2 is provided on one of a primary side and a secondary side of a vibration transmission path indicated by an arrow in FIG. 1 and a second cover body 3 is provided on the other side. The `` first vibration absorbing part '' 5 joined by the material 4 and the vibration energy loaded in the vibration transmission direction through the first cover body 2 or the second cover integral 3 are compressed and deformed by the vibration energy. It is provided with “second vibration absorbers” 6, 9, 10, and 17, which can be absorbed.

As shown in FIG. 2, the first cover integral part 2 is made up of covers 7 and 8 formed by vertically dividing the first cover body 2 with its outer peripheral surface being cylindrical, and the inner peripheral surface thereof and the second cover integral part. 3 is attached to the outer peripheral surface by a viscoelastic body 4. The first cover body 2 is attached to the upper surface of the damping metal plate 9 of the second vibration absorbing section 6 so as to be elastically supported by the viscoelastic body 10 as shown in FIG. . In addition, as shown in FIG. 3, the force cover pieces 7 and 8 are directly fixed to the elastic pedestal 11, and the vibration damping metal plate 9 and the load damping metal plate 9 are interposed between the first cover 1 and the load receiving plate 12. The laminated viscoelastic body 10 may be attached. A load receiving plate 12 is attached to the top surfaces of the cover pieces 7 and 8 to support objects to be supported, such as vibrations of buildings and precision measurement equipment, or furniture and other housing-related equipment. Objects that dislike it, or conversely, objects that generate vibrations during operation, such as motors, washing machines, rolling machines, and other various machine tools, are fixed and receive the load. In order to fix the object to be supported, the load receiving plate 12 is provided with a bolt 13 as a “support”. The second cover integral part 3 has second vibration absorbing parts 6, 9, 10, 10 and 17 provided therein, and is provided on a floor surface or a substrate or the like which is a primary side or a secondary side in the arrow vibration transmission path. On the other hand, it is fixed by bolts or other connecting means (not shown).

The viscoelastic material 4 is bonded to the inner peripheral surface of the first cover body 2 and the outer peripheral surface of the cylinder of the second cover body 3 by an adhesive action of the viscoelastic material 4 so that the i-th cover body 2 and / or It acts so as to absorb the vibration energy from the second cover integral 3 by shear deformation. Further, the viscoelastic material 4 also functions as a damper for reducing the resonance amplitude of the vibration-proof / vibration-suppressing object on a stage where the spring constant of the second vibration absorbing section is set low. In this embodiment, The viscoelastic material 4 is a bonding layer 4 in which tape-shaped viscoelastic materials are laminated in order to obtain a large displacement due to shear deformation. As the viscous material 4, for example, a viscoelastic body made of an acrylic resin may be used. The viscoelastic body 4 is selected from materials which are unlikely to change over time and which always maintain the initial viscoelastic body.

The second vibration absorbers 6.9, 10 and 17 are provided with two partition plates 15 and 16 near the middle part of the metal cylindrical body 14; A housing 17 having a hollow space between the second cover 1 and the housing 16 is provided inside the second cover integral part 3. Each of the partition plate 15 on one side of the housing 17 and the partition plate 16 on the other side has a diameter slightly smaller than that of the partition plates 15 and 16, for example, a synthetic material of natural rubber, neoprene or butyl. A cylindrical or cylindrical elastic pedestal 6. & made of rubber is bonded and fixed via a viscoelastic body 10. As described above, the housing 17 having the two partition plates 15 and 16 and the second cover 1 are integrated to provide a robust and stable vibration energy absorbing structure capable of preventing the falling down of even heavy loads. Apparatus 1 can be used. It is more preferable that the rubber used as the elastic pedestals 6, 6 has a low spring constant in order to keep the resonance frequency low. The upper surface of the elastic pedestal 6 is bonded and fixed to, for example, a ring-shaped or disk-shaped damping metal plate 9, and then bonded and fixed to the first cover body 2 via a viscoelastic body 10. A transmission path is formed. The damping metal plate 10 is used to more effectively attenuate vibration, and for example, a non-ferrous metal or a synthetic resin bonded to a steel plate or another metal plate is used.

The second vibration absorbers 6, 9, 10, 17 can be variously deformed. For example, various elastic bodies including a spring such as a coil spring can be used instead of the elastic pedestals 6 and 6. Furthermore, the housing 17 is not limited to the shape of this embodiment, and the elastic pedestals 6 and 6 are directly bonded to the second cover unit 3 and the damping metal plate 9 without using the housing 17. Or a laminated structure in which a damping metal plate is inserted between each of a plurality of elastic pedestals in a ring shape. In the vibration energy absorbing device 1 configured as described above, the load receiving plate 1 2 When a vibration-generating object such as a motor, a washing machine, a forging machine, or various machine tools is attached to the object, the vibration from the object is transmitted from the load receiving plate 12 through the vibration-damping metal plate 9 Then, the elastic pedestal 6, the housing 17 and the elastic pedestal 6 are sequentially transmitted to the floor. In this transmission process, most of the vibration components are attenuated by the elastic pedestals 6 and 6, the laminated viscoelastic body 4 and the damping metal plate 9, but it takes some time for the vibration to be attenuated by these vibration absorbing materials. In short, especially in the case of continuous vibrations applied in a short time, small vibrations will remain. Therefore, in order to further assure vibration absorption, the first cover members 7 and 8 and the second cover member 3 are joined by a joining layer made of the viscoelastic body 4, and the load is also transmitted to the viscoelastic body 4. In this way, the vibration is absorbed in a short time by the shear deformation of the viscoelastic body 4, so that the resonance frequency is lowered and the vibration is attenuated rapidly, and extremely excellent protection against the vibration generated continuously in a short time. A vibration effect can be exhibited.

Second embodiment>

A second embodiment of the vibration energy absorbing device according to the present invention will be described with reference to FIG. The vibration-absorbing energy device 1 has a configuration in which the second cover body 3 has a cylindrical base 19 with a flange 20 and a housing 17 is not provided, and only the rubber base 6 is used as the second vibration-absorbing part. And a point force in which an auxiliary cover integral body 21 and a viscoelastic body 22 are further provided in the first vibration absorbing portion. This is different from the vibration energy absorbing device of the first embodiment shown in FIG. In other words, the base 3 as the “integral of the second cover” is a base 19 that is partially raised in a columnar shape in FIG. 4, and is the primary side of the arrow vibration transmission path. Alternatively, a flange 20 provided on the cylindrical base 19 with respect to the secondary side is attached via a viscoelastic body 10. An elastic pedestal 6 as a “second vibration absorbing portion” is provided on the cylindrical base 19, and the two divided cover pieces 7 and 8 are adhered to the elastic pedestal 6. Therefore, it is elastically supported.

Furthermore, the cylindrical side surfaces of the cover pieces 7 and 8 are joined at a predetermined interval between the auxiliary cover integral part 21 and the first cover integral part 2 which are substantially divided into two cylindrical bodies, and the vibration energy is A viscoelastic body 22 that absorbs by shear deformation is provided. Like the viscoelastic material 4, the viscoelastic body 22 has a laminated structure of a tape-shaped viscoelastic body. Of course, the first vibration absorbing portion 5 having such a structure is not provided only one as shown in this embodiment, but a viscoelastic body is further attached to the outside of the auxiliary cover integral 21 and further another cover is provided. An integral part may be provided. As described above, the vibration energy absorbing device 1 having the same vibration damping effect as that of the first embodiment can be formed with a simple structure in which the amount of the synthetic rubber 6 is reduced by raising the height of the base 19. In addition, since the viscoelastic bodies 4 and 22 having a laminated structure are provided in parallel with respect to the shearing force in the direction of arrow vibration transmission, the damping effect in the low frequency region can be obtained more effectively. is there.

Third embodiment>

A third embodiment according to the present invention will be described with reference to FIG. 5 and FIG. The vibration-absorbing energy device 1 according to the embodiment shown in FIG. 5 regulates an excessive inclination due to vibration energy of the support 13 to which the first cover 2 is attached via a load receiver 12. A base 19 is provided. The vibration energy absorber 1 shown in FIG. 5 is the same as the vibration energy absorber 1 shown in FIG. 4 except that the base 19 is formed as a single body with the flange 20. The support body 13 is provided with an object to be subjected to vibration isolation and vibration suppression at one end thereof, and a load receiving plate 12 for receiving the loaded load and a vibration-damping metal plate 9. It is provided so as to penetrate the first cover body 2 and the second cover integral part 3. At the penetrating projecting portion, a stopper for preventing removal, that is, a spring washer 26 and a nut 27 are arranged. A collar 25 is provided so as to cover the outer peripheral surface of the support 13. In addition, a base 19 as a “regulator” having a regulation hole 24 for regulating an excessive inclination of the support 13 is provided. If the support 13 is excessively tilted, the collar 25 comes into contact with the peripheral side surface of the restriction hole 24, and the stoppers 26, 27 also move around the restriction hole 24. Due to the contact with the side, the excessive inclination of the support 13 is regulated. The vibration energy absorbing device 1 shown in FIG. 6 is configured such that the second vibration absorbing portion includes a plurality of elastic pedestals 6 and a damping metal plate 9 provided therebetween. As in FIG. 5, the vibration energy absorbing device 1 is also provided with a pedestal portion 9 as a restricting portion so that an excessive inclination of the support member 13 is restricted.

4th embodiment>

Fourth Embodiment of a Vibration Energy Absorber of the Present Invention With reference to FIG. explain. The vibration energy absorbing device 1 according to the fourth embodiment includes a first vibration absorbing portion 5 in which a first cover integral portion 2 and a second cover body 3 are joined by a viscoelastic material 4, and a coil spring as a “second vibration absorbing portion”. 28 is an embodiment in which the other embodiments of the restriction unit 24 shown in the fourth embodiment are combined.

One of the coil springs 28 is installed inside the second cover integral part 3 so as to insulate the transmission of vibration energy transmitted from the primary side to the secondary side, and under a load, The other is fixed via a support plate 29 so as to support the first cover integral 2.

The viscoelastic body 4 of the first vibration absorbing means 5 has a function of reducing the free vibration of the coil spring 28 to reduce the resonance amplitude of the vibration-proof and vibration-damping object. In particular, when a bias load is applied to the coil spring 28, it effectively functions to prevent buckling and surge phenomena.

In this embodiment, while the vibration insulation is performed by the compression deformation of the coil spring 28 having a low spring constant, the vibration is damped by the shear deformation by the laminated structure of the viscoelastic body 4 provided in parallel with the coil spring 28. By making the coil spring 28 and the viscoelastic body 4 act in a complementary manner, a passive vibration energy absorbing device having a damping effect even in a low frequency region is obtained.

Next, a method of assembling the vibration energy absorbing device 1 will be described with reference to FIG.

First, the coil spring 28 is installed on the second cover unit 3. Next, a support 13 on which the load receiving plate 2 and the support plate 29 are fixed and on which one end of an object (not shown) for vibration isolation and vibration suppression is fixed is provided on the second cover 3. It is provided so as to penetrate the restriction hole 31 of the part 30. At this time, the load applied to the viscoelastic body 4 to be described later can be almost canceled by the vibration damping-vibration control object to the coil spring 28, so that a smaller preliminary load than the loaded load is applied. . The specific numerical value of the preload is determined by the weight of the vibration damping / damping target object, the number of vibration energy absorbing devices 1 installed on the vibration damping / vibration damping target object, the arrangement thereof, and the like. Then, a regulating member 32 that regulates the inclination of the support body 13 by contact with the base portion 30 is installed with a predetermined gap provided between the support member 13 and the base portion 30, and the stopper 33 is provided. Are provided on the support 13 Fit into the circumferential groove and fix.

Next, the viscoelastic body 4 is adhered to the cylindrical outer peripheral surface of the second cover body 3, and the cover pieces 7, 8 of the first cover body 2 are attached to the viscoelastic body 4 while facing each other from the side in the figure. Then, the cover pieces 7, 8 and the support plate 29 are fixed by screws 37. Finally, when the preliminary load on the coil spring 28 is released, the vibration energy absorbing device 1 according to the present embodiment is formed. In a state where the preliminary load is released, the regulating member 32 and the base portion 30 of the second cover unit 3 are in contact with each other and are in a lying state. However, when an object to be damped or damped is attached to the support 13, the loaded load is applied to the coil spring 28, so that a predetermined clearance is established between the regulating member 32 and the second cover 1 3. A lance is formed (see FIG. 6), and the regulating member 32 and the base portion 30 of the second cover body 3 are in a non-contact state, that is, an insulating state. At this time, the load applied to the viscoelastic body 4 that abuts the first cover integral body 2 and the second cover integral body 3 is almost unloaded, and exhibits the characteristics of the viscoelastic body 4 in an optimal state. It is in a state that can be performed.

A vibration energy absorbing device according to a fifth embodiment will be described with reference to FIG. The vibration energy absorbing device 1 according to this embodiment is characterized in that the first vibration absorbing portion 5 is provided with a single auxiliary cover 34, and that a plurality of coil springs 3 as "second vibration absorbing portions" are provided. The difference is that 5 and 36 are provided in series in the vibration transmission path. The two coil springs 35 and 36 according to this embodiment can set an arbitrary spring constant with the same or different spring constants. In addition, since the laminated viscoelastic bodies 4 and 4 are provided in series, the amount of displacement due to shear deformation of the first vibration absorbing section 5 can be increased, and a damping effect in a low frequency region can be obtained. .

In this embodiment, only one auxiliary cover body 34 is provided. However, an arbitrary number of auxiliary cover integrated bodies 34 can be connected in cascade by the same connection method. In this case, the number of coil springs added is

As many as 4 numbers will be added.

Examples of experiments>

Experimental Example and Calculation Formula of Vibration Characteristics by Vibration Energy Absorber of Fourth Embodiment Will be described with reference to FIG. The vibration energy absorbing device 1 shown in FIG. 9 is represented as an equivalent model of the device shown in FIG. In this experiment, an object 40 with a mass of M was loaded as an object to be damped, and the exciter 41 was used to excite the foundation of the damper system with forced displacement vibration V, and the The properties were measured. Here, the viscoelastic body 4 of the vibration energy absorbing device 1 is known to depend on the frequency, amplitude and temperature. Force Here, it is assumed that these effects are not considered.

If the displacement vibration of the load mass M at this time is U, the equation of motion of the vibration isolating system is as follows.

d ² U

M ~~ + k _R U = k _R V

d t

(However, k _R is the composite complex panel constant of the vibration energy absorbing device 1.) As far as the inventor knows, a vibration energy absorbing device using butyl-based rubber having high vibration-proof effect is used. In the above experiment, the resonance magnification is about 3.0, whereas the vibration stage of the vibration energy damping device 1 according to the fourth embodiment, the resonance magnification is about 1.5, which is almost half of the former. I understand. Also, the loss coefficient is within the range that can be known by the present inventor, for example, in the case of butyl-based synthetic rubber, the best value is around 0.5, whereas in the case of the vibration energy damping device 1 according to the present embodiment, , About 0.8 or more, a measurement value showing an extremely high and attenuating effect could be stably obtained.

From the experimental results, the configuration of the passive-type vibration energy absorber 1 according to the fourth embodiment of the present invention, that is, the first vibration absorber 5 and the second vibration absorber 28 are arranged in parallel in the vibration transmission direction Provided, a configuration in which a coil spring 28 having a low spring constant is set as the second vibration absorbing section 28 to perform vibration isolation, and a shear deformation of the viscoelastic body 4 of the first vibration absorbing section 5 Thus, it was confirmed that the configuration in which the vibration was absorbed by the device was able to significantly absorb the vibration energy and obtain the vibration damping effect even in a low frequency region. Industrial applicability

As described above, the passive type vibration energy absorbing device of the present invention Can reduce the resonance frequency of vibration-damping and vibration-damping objects with a simple structure that has a low resonance frequency and a damper mechanism integrated in the same device. In this case, the vibration damping effect can be obtained.

Claims

The scope of the claims

In the vibration energy absorbing device interposed between the primary side and the secondary side of the vibration transmission path,

A first cover body is disposed on one of the primary side and the secondary side, and a second cover integral body is disposed on the other side, and the two cover bodies are joined together between the first and second cover integral bodies. A first vibration absorbing portion provided with a viscoelastic material for absorbing vibration energy transmitted from the first or second cover integrally by deformation in a shear direction;

It is provided inside the first or second cover and biases it visibly in the direction of separating them from both covers, and the vibration energy transmitted from the first or second cover is transformed into the vibration transmission direction. And a second vibration absorbing portion including an elastic body that absorbs and absorbs the vibration energy in parallel.

2. The vibration energy absorbing device according to claim 1, wherein the elastic body of the second vibration absorbing section is a coil spring.

The vibration energy absorption according to claim 1, wherein a preliminary load for canceling a load applied to the viscoelastic material by the vibration damping / damping object is applied to the second vibration absorbing portion. A combination of at least one auxiliary cover body with the body, and a viscoelastic material between the first cover body and the integrated auxiliary cover, and between the second cover body and the auxiliary force bar body 3. The vibration energy absorbing device according to claim 1, wherein the first vibration absorbing portion is formed by joining the first and second vibration absorbing portions.

The vibration energy absorbing device according to claim 1, wherein the viscoelastic material of the first vibration absorbing portion is formed by forming a viscoelastic body in a laminated shape.

. A second vibration absorbing portion including an elastic body for absorbing vibration;

A load receiving portion fixed to an upper surface of the second vibration absorbing portion and receiving a load of an object; and a fixing member fixed to a base supporting the second vibration absorbing portion and positioned on a side of the second vibration absorbing portion. When,

And a second vibration absorbing section including a cover disposed at a gap outside the fixing member and fixed to the load receiving section, and a viscoelastic body joined to the cover and the fixing member at the gap. The vibration energy absorption according to claim 1, characterized in that:

The vibration energy absorbing device according to claim 1, wherein one of the first cover body and the second cover body is divided into a plurality of parts.

The first vibration absorbing portion is obtained by further arranging the auxiliary cover integrally on the outer periphery of the first cover or the second cover, and joining the auxiliary cover with the first vibration absorbing portion via the viscoelastic body. The vibration energy absorbing device according to claim 1.

A support for mounting the vibration damping object is provided so as to penetrate the first cover integral with the second cover body, and a stopper for preventing detachment is provided at a penetrating projection thereof. A restricting portion for restricting the inclination of the support is provided integrally with the cover and the second cover, and when the support is inclined by vibration, the restricting portion prevents the through-projecting portion from excessively tilting. Vibration energy absorption according to claim 1, which regulates the inclination