WO2018163912A1 - 内燃機関の吸気構造 - Google Patents
内燃機関の吸気構造 Download PDFInfo
- Publication number
- WO2018163912A1 WO2018163912A1 PCT/JP2018/007227 JP2018007227W WO2018163912A1 WO 2018163912 A1 WO2018163912 A1 WO 2018163912A1 JP 2018007227 W JP2018007227 W JP 2018007227W WO 2018163912 A1 WO2018163912 A1 WO 2018163912A1
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- WIPO (PCT)
- Prior art keywords
- passage
- valve
- intake
- tumble
- idle air
- Prior art date
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 76
- 238000005192 partition Methods 0.000 claims abstract description 16
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 description 13
- 239000000446 fuel Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 5
- 239000002737 fuel gas Substances 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
Images
Classifications
-
- 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
- F02B31/00—Modifying induction systems for imparting a rotation to the charge in the cylinder
- F02B31/04—Modifying induction systems for imparting a rotation to the charge in the cylinder by means within the induction channel, e.g. deflectors
- F02B31/06—Movable means, e.g. butterfly valves
-
- 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
- F02B31/00—Modifying induction systems for imparting a rotation to the charge in the cylinder
- F02B31/04—Modifying induction systems for imparting a rotation to the charge in the cylinder by means within the induction channel, e.g. deflectors
-
- 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
- F02B31/00—Modifying induction systems for imparting a rotation to the charge in the cylinder
- F02B31/08—Modifying induction systems for imparting a rotation to the charge in the cylinder having multiple air inlets
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
- F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
- F02D9/1035—Details of the valve housing
- F02D9/1055—Details of the valve housing having a fluid by-pass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
- F02M35/10078—Connections of intake systems to the engine
- F02M35/10085—Connections of intake systems to the engine having a connecting piece, e.g. a flange, between the engine and the air intake being foreseen with a throttle valve, fuel injector, mixture ducts or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
- F02M35/10255—Arrangements of valves; Multi-way valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
- F02M35/10262—Flow guides, obstructions, deflectors or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/104—Intake manifolds
- F02M35/108—Intake manifolds with primary and secondary intake passages
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/30—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for facilitating the starting-up or idling of engines or by means for enriching fuel charge, e.g. below operational temperatures or upon high power demand of engines
- F02M69/32—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for facilitating the starting-up or idling of engines or by means for enriching fuel charge, e.g. below operational temperatures or upon high power demand of engines with an air by-pass around the air throttle valve or with an auxiliary air passage, e.g. with a variably controlled valve therein
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to an intake structure of an internal combustion engine provided with an idle air passage, a throttle valve and a tumble valve.
- Patent Document 1 shows an intake structure of an internal combustion engine that generates tumble flow by suppressing and controlling the intake amount to the main passage with a tumble valve as a sub-passage for generating H.
- the lower side of the intake passage of the throttle body is formed as the main passage, and the upper side is formed as the auxiliary passage for generating tumble flow, and the idle air passage is arranged above the auxiliary passage, and the throttle valve is fully closed idle operation
- idle air controlled by an IACV (idle air control valve) inserted in the idle air passage flows into the sub passage from the idle air passage and is supplied to the combustion chamber, for example, Patent Document 2 below.
- IACV inner air control valve
- the fuel injection valve is usually provided above the intake passage.
- the upper side is a main passage with a large flow passage cross section so that the distance between the fuel injection valve and the partition plate can be taken
- the lower side is a secondary passage for generating tumble flow. Is preferred.
- the idle air passage is arranged on the lower side of the auxiliary passage.
- Japanese Patent No. 5925878 (FIGS. 2 and 6 to 8) Japanese Patent Application Laid-Open No. 2002-221036 (FIGS. 2 to 4)
- the present invention has been made in view of the above-mentioned prior art, and has a throttle valve and a tumble valve on the downstream side thereof.
- the upper side of the intake passage on the downstream side of the tumble valve is a main flow path and the lower side is a tumble flow path. It is an object of the present invention to provide an intake structure of an internal combustion engine in which tumble flow can be easily enhanced even at idle operation or the like.
- an internal combustion engine having a combustion chamber includes a cylinder block and a cylinder head, the cylinder head is provided with an intake port and an exhaust port, and an inlet pipe is connected to the intake port.
- a throttle body having an intake passage continuing to the intake passage is connected to the intake flow upstream side of the inlet pipe, and a throttle valve and an intake passage of the intake passage are connected.
- a tumble valve is provided on the downstream side in the flow direction, and the intake passage is a downstream side of the tumble valve, and the tumble flow for generating the tumble flow in the combustion chamber and the upper main passage by the partition plate portion
- An idle air passage communicating the upstream side and the downstream side of the throttle valve is provided on the upper side of the intake passage, the idle air passage has a downstream side outlet, and the downstream side outlet is at the upper inner surface of the intake passage. It is provided between the throttle valve and the tumble valve, has a tumble valve plate and a notch thereof, and idle air flowing out through the idle air passage when the throttle valve is fully closed is controlled by the tumble valve plate.
- the intake structure of an internal combustion engine is characterized in that the flow into the upper main passage is suppressed, and it is guided from the notch to the lower sub passage.
- the downstream passage connected to the downstream outlet of the idle air passage may be formed to be parallel to the tumble valve plate of the tumble valve at the time of valve closing in a vertical horizontal direction with respect to the flow direction of the intake passage.
- the downstream passage in the vicinity of the downstream outlet of the idle air passage is formed parallel to the tumble valve plate of the tumble valve at the time of valve closing in vertical horizontal direction with respect to the flow direction of the intake passage.
- the intake passage downstream of the throttle valve may be formed with an inner surface tapered portion that increases in diameter toward the downstream side, and the downstream outlet of the idle air passage may be provided in the inner surface tapered portion.
- the downstream side passage of the idle air passage is vertically horizontal to the flow direction of the intake passage by providing the downstream side outlet of the idle air passage at the inner surface tapered portion of the intake passage which expands toward the downstream side. It becomes easy to form in parallel with the tumble valve plate of the tumble valve at the time of valve closing in direction view.
- the downstream outlet of the idle air passage may be provided at a position closer to a throttle valve shaft of the throttle valve than a tumble valve shaft of the tumble valve. According to the configuration, the downstream outlet of the idle air passage. By being provided at a position closer to the throttle valve shaft than the tumble valve shaft, the distance between the downstream outlet of the idle air passage and the notch of the lower plate portion of the tumble valve can be further increased, and the idle flowing out of the idle air passage The air can be easily introduced into the lower auxiliary passage from the notch of the lower plate portion of the tumble valve.
- the intake structure of the internal combustion engine of the present invention during idle operation, idle air flowing into the intake passage from the idle air passage provided on the upper side of the intake passage of the throttle body flows into the intake passage by the tumble valve plate of the tumble valve. It is suppressed from flowing into the upper main passage, and it is guided and collected from the notch part of the tumble valve plate to the lower side passage which becomes the tumble flow passage, and the tumble flow can be easily generated and reinforced. Since the air passage is provided on the upper side of the intake passage, it is possible to make it difficult for the fuel gas to be accumulated in the idle air passage and to provide the idle air passage on the intake passage. Further, when the intake valve of the combustion chamber is closed, the fuel and the intake air are agitated in the intake port, and the mixture can be homogenized.
- FIG. 1 is a right side view of a motorcycle equipped with a power unit provided with an intake structure for an internal combustion engine according to Embodiment 1 of the present invention. It is a rear right side of the two-wheeled motor vehicle of FIG. 1 which removed the vehicle body cover.
- FIG. 3 is a side cross-sectional view of the power unit in the same orientation as shown in FIG. 2; It is a principal part enlarged view of FIG. It is a right view of the throttle body which takes out only the throttle body of FIG. It is a front view of the tumble valve by the b arrow of FIG. It is a right view which makes a partial cross section a vehicle-mounted power unit provided with the intake structure of the internal combustion engine which concerns on Embodiment 2 of this invention.
- FIGS. 1 to 6 A first embodiment of an intake structure of an internal combustion engine of the present invention will be described based on FIGS. 1 to 6.
- the directions such as front, rear, left, right, upper, lower, etc. follow the direction of the vehicle in a state where the power unit provided with the intake structure of the internal combustion engine according to the present embodiment is mounted on the vehicle.
- the vehicle is a small vehicle, and more specifically, a motorcycle.
- the intake passage 70 and the intake passage 80 of the throttle body 7 shown in FIGS. 3 and 4 the upper main passage 80A side divided by the partition plate portion 81 is the “upper” side, and the lower side auxiliary passage 80B is Describe as the "lower" side.
- an arrow FR indicates the front of the vehicle
- LH indicates the left of the vehicle
- RH indicates the right of the vehicle
- UP indicates the upper side of the vehicle.
- FIG. 1 shows the right side surface of a motorcycle 1 equipped with a power unit 3 having an intake structure for an internal combustion engine according to a first embodiment of the present invention.
- the motorcycle 1 of the present embodiment is a so-called scooter type motorcycle, in which a vehicle body front portion 1A and a vehicle body rear portion 1B are connected via a low floor portion 1C, and a vehicle body frame 2 forming a framework of the vehicle body is It generally comprises a down tube 21 and a main pipe 22 (see FIG. 2). That is, the down tube 21 extends downward from the head pipe 20 of the vehicle front portion 1A, and the down tube 21 bends horizontally at the lower end and extends rearward below the floor portion 1C, as shown in FIG.
- a pair of left and right main pipes 22 are connected via a connecting frame 23 disposed in the vehicle width direction, and the main pipe 22 stands diagonally rearward from the connecting frame 23 to form an inclined portion 22a, and the middle pipe is inclined It bends so as to loosen and extends backward.
- the storage box 11 and the fuel tank 12 are supported above the inclined portion 22 a of the main pipe 22, and the storage box 11 and the fuel tank 12 are closed by a passenger seat 13 attached above the storage box 11,
- the lower part of the passenger seat 12 including the fuel tank 12 is covered with a vehicle body cover 10.
- a handle 14 is provided on the upper side so as to be pivotally supported by the head pipe 20, a front fork 15 extends downward, and a front wheel 16 is pivotally supported at its lower end.
- the power unit 3 has an air-cooled internal combustion engine (hereinafter simply referred to as "internal combustion engine”) 30 having a single-cylinder four-stroke cycle at its front portion, and has a crank shaft at the front of the power unit case 50 constituting the crankcase portion 50a.
- internal combustion engine air-cooled internal combustion engine
- the cylinder axis C is inclined substantially forward to a substantially horizontal state, and the end of the hanger arm 52 projecting forward from the lower end of the power unit case 50
- the parts are vertically and rotatably connected via a link member 25 attached to the bracket 24 of the main pipe 22.
- the cylinder block 31, the cylinder head 32 and the cylinder head cover 33 constituting the internal combustion engine 30 are sequentially stacked in a forward direction substantially horizontally substantially forward to the front of the power unit case 50 constituting the crankcase portion 50 a.
- a power transmission case 55 provided with a belt type continuously variable transmission etc. extends integrally from the crankcase 50a to the left rear, and a rear axle 56 which is an output shaft of the power unit 3 is provided at the rear.
- the rear wheel 17 is attached. That is, the power unit 3 is a so-called swing unit, and a rear cushion (not shown) is interposed between the power transmission case 55 at the rear of the power unit 3 and the rear of the main pipe 22.
- the inlet pipe 6 extends from the upper part of the largely forward-tilted cylinder head 32 of the internal combustion engine 30 and curves backward, and the throttle body 7 connected to the inlet pipe 6 Is disposed above the cylinder block 31 and an air cleaner 86 connected to the throttle body 7 via a connecting tube 85 is disposed above the power transmission case 55.
- an exhaust pipe 38 extending downward from the lower portion of the cylinder head 32 is bent backward, biased to the right and extends rearward, and is connected to the right muffler 39 of the rear wheel 16.
- FIG. 3 is a side cross-sectional view of the power unit 3 with the power unit 3 of FIG. 2 taken out and shown in substantially the same orientation as shown in FIG.
- the internal combustion engine 30 in the power unit 3 has a cross section of the left half face of the cylinder block 31, the cylinder head 32, and the cylinder head cover 33, and the power unit case 50 has a left case half 50L that is a mating surface with a right case half not shown. It is shown with 50b directed to the front of the figure.
- the power unit case 50 is configured by combining left and right split left case half 50L and a not-shown right case half, and the right case half forms the right half of the crankcase portion 50a, and the left case is a left case.
- the front half of the half 50L forms the left half of the crankcase portion 50a and extends rearward, and a long belt (not shown) is provided on the front and rear between the crankshaft 51 and the rear axle 56 of the rear wheel 17
- a power transmission case portion 55 is formed which accommodates a transmission including a continuously variable transmission, a reduction gear mechanism 57 and the like.
- the reduction gear mechanism 57 is housed inside the right open surface 55R at the rear of the power transmission case 55, and is covered by a reduction gear case (not shown).
- the output shaft of the reduction gear mechanism 57 is the rear axle 56 of the rear wheel 17.
- the rotational power of the crankshaft 51 of the crankcase 50 a of the internal combustion engine 30 is transmitted to the rear wheel 17 via the belt type continuously variable transmission in the power transmission case 55 and the reduction gear mechanism 57. .
- a piston 34 reciprocating in the cylinder bore 31 a of the cylinder block 31 is connected to a crank pin 51 a of a crankshaft 51 of the crank case 50 a by a connecting rod 35.
- a combustion chamber 36 is formed between the top surface 34a of the piston 34 slidably fitted in the cylinder bore 31a of the cylinder block 31 and the combustion chamber ceiling surface 32a of the cylinder head 32 opposed to the top surface 34a.
- the internal combustion engine 30 adopts a SOHC type two-valve system
- the cylinder head 32 is provided with a valve operating mechanism 9.
- a cylinder head cover 33 is overlaid on the cylinder head 32 so as to cover the valve operating mechanism 9.
- an endless cam chain (not shown) is provided on one side of the crankcase 50a, the cylinder block 31, and the cylinder head 32 in the direction of the crankshaft 51.
- the cam shaft 91 is bridged between the cam shaft 91 and the crank shaft 51 through the cam chain chamber, and the cam shaft 91 rotates in synchronization with the crank shaft 51 at a half rotation speed.
- An ignition plug (not shown) is inserted into the combustion chamber 36 from the opposite side of the cylinder head 32 to the cam chain chamber (the other side in the direction of the crankshaft 51).
- FIG. 3 and FIG. 4 which is an enlarged view of the main part of FIG. 3, the intake valve port 40 opened in the combustion chamber ceiling surface 32a in the cylinder head 32 in which the cylinder axis C is substantially horizontally inclined and largely inclined forward.
- the intake port 42 and the exhaust port 43 extend from the exhaust valve port 41 while curving in directions away from each other.
- the upstream end of the intake port 42 opens upward of the cylinder head 32 and is connected to the inlet pipe 6 to form a continuous intake passage 80, and the throttle body 7 is connected to the upstream side of the inlet pipe 6 Ru.
- the downstream end of the exhaust port 43 opens downward of the cylinder head 32 and is connected to the exhaust pipe 38 (see FIG. 2).
- a cylindrical intake valve guide 44 is integrally fitted to the curved outer wall portion 42 a of the intake port 42 in the cylinder head 32, and the intake valve 46 slidably supported by the intake valve guide 44 is a combustion chamber of the intake port 42.
- the intake valve port 40 facing 36 is opened and closed.
- an exhaust valve port facing the combustion chamber 36 of the exhaust port 43 is an exhaust valve 47 slidably supported by the exhaust valve guide 45 integrally fitted to the curved outer wall portion 43 a of the exhaust port 43 in the cylinder head 32. 41 open and close.
- the intake valve 46 and the exhaust valve 47 are biased upward by the valve spring 48 so that the umbrella portions 46a and 47a both close the intake valve port 40 and the exhaust valve port 41 facing the combustion chamber 36, As shown in FIG. 3, the stem ends 46b and 47b of the intake valve 46 and the exhaust valve 47 are pushed down by the intake rocker arm 94 and the exhaust rocker arm 95 swinging in contact with the intake cam 92 and the exhaust cam 93 of the camshaft 91.
- the intake valve 46 and the exhaust valve 47 are opened at a predetermined timing, and the intake port 42 and the combustion chamber 36, and the exhaust port 43 and the combustion chamber 36 communicate with each other, and intake and exhaust at a predetermined timing are performed.
- a tumble flow T of a fuel-air mixture in the combustion chamber 36 that is, an intake structure for giving longitudinal rotation is configured.
- An inlet pipe 6 is connected to an upstream end of an intake port 42 of the internal combustion engine 30 via an inlet 61 to form a continuous intake passage 80, and a throttle body 7 is disposed on the upstream side of the inlet pipe 6.
- the throttle body 7 has an intake passage 70 continuing to an intake passage 80 communicating with the combustion chamber 36 of the internal combustion engine 30, and its upstream side is connected to an air cleaner device 86 (see FIG. 2) via a connecting tube 85. ing.
- the throttle body 7 is rotatably supported in the throttle body 7 by a throttle valve shaft 71a that is oriented substantially horizontally and perpendicular to the flow direction F of the intake path 70, and variably controls the passage area of the intake path 70.
- a throttle valve 71 capable of opening and closing the passage 70 is provided.
- the tumble valve shaft 72a is oriented substantially horizontally perpendicular to the flow direction F of the intake passage 70 and parallel to the throttle valve shaft 71a.
- a tumble valve 72 rotatably supported.
- the throttle valve 71 provided on the upstream side of the intake passage 70 of the throttle body 7 is a butterfly type, and is a disc-like throttle valve bolted and fixed so as to rotate together with the throttle valve shaft 71a and the throttle valve shaft 71a. And a plate 71b.
- the throttle valve 71 is rotatable counterclockwise in FIGS. 3 and 4 in the valve opening direction, and a fully closed position where the throttle valve plate 71b contacts the inner surface 70a of the intake passage 70 by a return spring (not shown). The valve is urged clockwise in the valve closing direction so as to be located at.
- the tumble valve 72 provided in the intake passage 70 downstream of the throttle valve 71 in the flow direction F of the intake passage 70 is a butterfly type, and the tumble valve shaft 72a and the tumble valve It has a half-plate-like upper plate portion 72ba and a tumble valve plate 72b consisting of a lower plate portion 72bb extending downward, and is bolted and fixed so as to rotate together with the valve shaft 72a, and the lower plate portion 72bb
- the notch part 72c is formed in.
- the tumble valve 72 is rotatable in the valve opening direction counterclockwise in FIGS. 3 and 4, and the upper plate portion 72 ba of the tumble valve plate 72 b is an inner surface 70 a of the intake passage 70 by a return spring (not shown).
- the valve is urged clockwise in the valve closing direction so as to be located at the tumble valve closing position in contact with the valve.
- the notch 72c of the lower plate 72bb of the tumble valve plate 72b forms a tumble valve closing opening 70b (see FIG. 4) in the intake passage 70.
- the diameter of the intake passage 70 at the position where the tumble valve 72 is provided is enlarged through the inner surface slope portion 70c with respect to the diameter of the intake passage 70 at the position where the throttle valve 71 is provided. And ease of casting at the time of casting the throttle body 7.
- the intake passage 80 is divided into upper and lower portions by the partition plate portion 81 continuously from the inlet pipe 6 to the intake port 42, and the lower sub passage 80B and the lower sub passage 80B are tumbled. It is divided into upper main passage 80A except for.
- an inlet pipe side partition plate portion 81A, an insulator side partition plate portion 81B, and an intake port side partition plate portion 81C are continuously positioned.
- the upper main passage 80A and the lower auxiliary passage 80B each have an approximately horizontal cross section by vertically dividing the intake passage 80 on the downstream side of the tumble valve 72 by a partition plate portion 81 extending longitudinally through the inlet pipe 6 and the intake port 42. It is defined in a semicircular shape.
- the inlet opening 80Ba of the lower auxiliary passage 80B of the intake passage 80 of the inlet pipe 6 connected to the downstream side of the intake passage 70 of the throttle body 7 is the tumble valve in a state where the tumble valve 72 is in the closed position.
- the opening 72A is located downstream of the notch 72c of the air intake passage 70, that is, the downstream side of the tumble valve closing opening 70b of the intake passage 70, and the inlet opening 80Aa of the upper main passage 80A is a tumble valve plate 72b of the intake passage 70. It is located on the downstream side of the upper plate portion 72ba and is opened.
- a fuel injection valve 87 disposed so as to inject and supply fuel toward the intake valve port 40 is attached to the inlet pipe 6 so as to penetrate the upper main passage 80A from above and outside.
- the downstream end 81 b of the partition plate portion 81 that is, the downstream end 81 b located in the intake port 42 of the cylinder head 32 faces the cylinder block 31 in the cylinder head 32.
- the end 80Bb of the lower auxiliary passage 80B is formed to be directed to the combustion chamber ceiling surface 32a of the cylinder head 32. Therefore, the intake air flowing through the lower auxiliary passage 80B can flow into the cylinder bore 31a after passing over the umbrella portion 46a of the intake valve 46 as indicated by the small arrow in FIG.
- the tumble flow T can be easily generated in the chamber 36. That is, the lower side sub passage 80B is a tumble flow passage for generating the tumble flow T.
- the tumble valve 72 is an upper main passage of a pair of upper and lower main passages 80A and a lower auxiliary passage 80B which divides the intake air flow by the intake passage 80 downstream of the upper plate portion 72ba of the tumble valve plate 72b. It controls the inflow of the intake air flow to 80A to substantially open and close the upper main passage 80A, and the tumble valve plate 72b is formed with a notch portion 72c in its lower plate portion 72bb. That is, in the tumble valve closed position, the upper plate portion 72ba of the tumble valve plate 72b is positioned so as to cover the inlet opening 80Aa of the upper main passage 80A to suppress the inflow of the intake flow, and the intake flow is lowered by the tumble valve plate 72b.
- the upper main passage 80A is substantially closed because it is guided from the notch portion 72c of the plate portion 72bb to the lower side auxiliary passage 80B. While the intake flow into the upper main passage 80A increases as the tumble valve 72 rotates in the open direction, when the tumble valve 72 is in the fully open position, as shown by the two-dot chain line in FIGS.
- the throttle valve plate 71b and the tumble valve plate 72b are positioned parallel to the flow direction F of the intake passage 70, and the intake flow flowing through the intake passage 70 is not disturbed by the throttle valve 71 and the tumble valve 72, and the intake amount is sufficient. Can flow to the upper main passage 80A and also to the lower side passage 80B to the combustion chamber 36.
- the throttle valve 71 is turned by operation of an accelerator grip 75 (see FIG. 1) by a driver via a throttle wire (not shown), and an on-off valve is made.
- the accelerator grip 75 When the accelerator grip 75 is not operated, the valve is closed by the return spring, but the idle air passage 100 for supplying the intake amount necessary for the idle operation and the minimal load operation of the internal combustion engine 30 It is provided in the throttle body 7 on the upper side so as to communicate the upstream side and the downstream side of the throttle valve 71, and the downstream side outlet 102 of the idle air passage 100 opens to the inner upper surface 70aa of the intake passage 70.
- An IACV (idle air control valve) 101 is interposed in the idle air passage 100, and the amount of idle air supplied is controlled according to the operating state of the internal combustion engine 30.
- the downstream outlet 102 which passes through the idle air passage 100 and opens to the inner upper surface 70aa of the intake passage 70.
- the idle air flows out to the intake passage 70 and the idle air flowing out to the intake passage 70 is prevented from flowing into the upper main passage 80A of the intake passage 80 by the tumble valve plate 72b of the tumble valve 72, and the notch portion 72c of the tumble valve plate 72b At the time of closing the tumble valve by the valve, it is collected to pass through and is led to the lower side sub passage 80B and is flowed toward the combustion chamber 36. Since the idle air passage 100 is provided on the upper side of the intake passage 70, it is difficult for the fuel gas to be accumulated in the idle air passage 100, and the idle air passage 100 can be provided on the intake passage 70.
- the flow velocity of the intake air flowing into the combustion chamber 36 can be increased during idle operation or low load operation, and the tumble flow T (longitudinal vortex flow) of the intake generated in the combustion chamber 36 can be strengthened.
- the intake flow is controlled by the tumble valve 72 to flow only in the lower side auxiliary passage 80B, and is directed to the combustion chamber 36.
- the intake air tumble flow T generated in the combustion chamber 36 can be further strengthened.
- the throttle valve 71 and the tumble valve 72 are interlocked by an interlocking mechanism (not shown), and the tumble valve 72 is set to open in a predetermined relationship according to the opening degree of the throttle valve 71, and the throttle valve 71 is
- the throttle valve plate 71b and the tumble valve plate 72b are positioned parallel to the flow direction F of the intake passage 70 as shown by the two-dot chain line in FIG.
- the intake air flowing through 70 can be directed to the combustion chamber 36 with a sufficient intake amount flowing to both the upper main passage 80A and the lower auxiliary passage 80B without being interrupted by the throttle valve 71 and the tumble valve 72. .
- the downstream passage 103 in the vicinity of the downstream outlet 102 of the idle air passage 100 is viewed in a horizontal direction perpendicular to the flow direction of the intake passage 70 or a side cross sectional view of the intake passage 70.
- the intake passage 70 on the downstream side of the throttle valve 71 is formed with an inner surface tapered portion 70c that expands in diameter toward the downstream side, and the downstream outlet 102 of the idle air passage 100 is an inner surface tapered portion 70c.
- the downstream side passage 103 of the idle air passage 100 is formed parallel to the tumble valve plate 72b of the tumble valve 72 at the time of valve closing in a vertical horizontal direction with respect to the flow direction F of the intake passage 70. It has become.
- the downstream outlet 102 of the idle air passage 100 is provided in the inner surface tapered portion 70c, so that the downstream outlet 102 of the idle air passage 100 is directed to the tumble valve closing opening 70b. The flowing intake flow can be facilitated to flow to the lower side sub passage 80B.
- downstream outlet 102 of the idle air passage 100 is provided at a position closer to the throttle valve shaft 71a of the throttle valve 71 than the tumble valve shaft 72a of the tumble valve 72 as shown in FIG.
- the distance between the downstream outlet 102 of the air passage 100 and the notch 72c of the lower plate 72bb of the tumble valve 72 can be further increased, and idle air flowing out of the idle air passage 100 can be used for the lower plate 72bb of the tumble valve plate 72b. It can be made easy to flow into the lower side sub-passage 80B from the notch 72c.
- the intake structure of the internal combustion engine according to the present invention is applied to the power unit 3 forming the swing unit has been described as the first embodiment, but the intake structure of the internal combustion engine according to the present invention has such a cylinder shaft
- the application of the power unit 3 is not limited to the power unit 3 in which C is nearly horizontal and forward-tilted, but may be applied to other types of power units.
- the intake structure of the internal combustion engine according to the present invention is the same in an internal combustion engine having a cylinder axis C as shown in FIG. 7, that is, a vehicle power unit 3 'having a so-called vertical internal combustion engine 30'. Applied with effects. This will be described below as a second embodiment.
- the power unit 3 'of the second embodiment shown in FIG. 7 is fixedly mounted on the vehicle body frame of the motorcycle in the attitude shown in FIG. 7, but the cylinder block 31, the cylinder head 32, An internal combustion engine 30 'is configured in which the cylinder head covers 33 are tightened slightly forward and upward so as to be sequentially stacked, and the crankshaft 51 is oriented in the vehicle width direction.
- the rear of the power unit case 50 ' is provided with a gear transmission 58' having a main shaft 58a 'and a counter shaft 58b' parallel to the crankshaft 51, and the counter shaft 58b 'is an output shaft.
- An exhaust port 43 opens at the front of the cylinder head 32 and is connected to an exhaust pipe 38 (not shown), and an intake port 42 opens at the rear, and is directed rearward, that is, toward the upstream side of the intake flow.
- the throttle body 7 and the connecting tube 85 are sequentially connected and further connected to an air cleaner device (not shown).
- the inlet pipe 6 and the intake port 42 are provided with the partition plate portion 81, and the throttle body 7 is provided with the same throttle valve 71 and tumble valve 72.
- An idle air passage 100 communicating the upstream side and the downstream side of the throttle valve 71 is provided.
- the downstream outlet 102 of the idle air passage 100 is, as shown in FIG. It is provided between the tumble valves 72. Therefore, also in the second embodiment, as shown in FIG. 7, the intake structure of the internal combustion engine of the present invention similar to that of the first embodiment is provided, and the same function and effect can be obtained.
- first and second embodiments of the present invention have been described above.
- the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the scope of the present invention.
- vehicles, internal combustion engines etc. may be implemented in various ways within the scope of the invention.
- the intake structure for generating the tumble flow in the combustion chamber the present invention may be applied to an intake structure for generating the swirl flow in the combustion chamber.
- the left and right arrangements of the illustrated embodiment are described for convenience of explanation, the present invention is also included in the scope of the invention even if the left and right arrangements are different.
- Cylinder head, 32a combustion chamber ceiling surface, 34: piston, 34a: top surface, 35: connecting rod, 36: combustion chamber, 40: intake valve port, 41: exhaust valve port, 42: intake port, 42a: curved outer wall Parts, 43: Exhaust port, 46: Intake valve, 46a: Umbrella part, 47: Exhaust valve, 48: Valve spring, 50, 50 ': Power unit case, 50L: Left case half body, 50a: Crankcase part, 51: ... Crankshaft 51a Crank pin 55 Power transmission case portion 58 'Gear transmission 58a' Main shaft 58b 'Countershaft 70 Intake path 70a Inner surface 70aa Upper surface 70b Tumble valve closing opening, 70c ...
- throttle valve 71a throttle valve shaft 71b: throttle valve plate 72: tumble valve 72a: tumble valve shaft 72b: tumble valve plate 72ba: upper plate portion 72bb: lower plate portion 72c ... Notched part, 80: Intake passage, 80A: Upper main passage, 80Aa: Entrance opening, 80B: Lower auxiliary passage, 80Ba: Entrance opening, 80Bb: Termination, 81: Partition plate part, 81b: Downstream end, 100 ... idle air passage, 101 ... idle air control valve, 102 ... downstream outlet, 103 ... downstream passage, C ... cylinder axis, F ... (in intake path 70) flow direction, T ... tumble flow
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
Description
また、スロットルボディの吸気通路の下側を主通路、上側をタンブル流を発生させるための副通路に形成し、副通路の上側にアイドルエア通路を配置して、スロットル弁が全閉のアイドル運転時や低負荷運転時は、アイドルエア通路に介装されたIACV(アイドルエアコントロール弁)により制御されたアイドルエアがアイドルエア通路から副通路に流入し、燃焼室へ供給される構造が、例えば、下記特許文献2に示されている。同特許文献2においては、副通路を流れる吸気は、高い流速で吸気ポートに沿って燃焼室の一方に偏った方向へ流入し、タンブル流を生成することが示されている。
そのように、吸気通路の下側に副通路を設けて、副通路側にアイドルエアコントロール弁を介装したアイドル通路を配置した場合は、アイドルエア通路が副通路の下側に配置されることになり、下側に配置されたアイドルエア通路に空気より比重の大きい燃料のガス溜まりが発生し易くなる。
前記吸気路の上側に前記スロットル弁の上流側と下流側を連通するアイドルエア通路が設けられ、同アイドルエア通路は下流側出口を有し、同下流側出口は、前記吸気路の内面上部において前記スロットル弁と前記タンブル弁の間に設けられ、タンブル弁板とその切欠き部を有し、前記スロットル弁の全閉時に前記アイドルエア通路を通って流れ出たアイドルエアは、前記タンブル弁板により前記上側主通路への流入が抑制され、前記切欠き部から前記下側副通路に導かれるように構成されたことを特徴とする内燃機関の吸気構造である。
その構成によれば、アイドルエア通路の下流側出口近傍の下流側通路が、吸気路の流れ方向に対する垂直水平方向視での閉弁時のタンブル弁のタンブル弁板と傾斜角度と平行に形成されたことで、アイドルエア通路から流れ出たアイドルエアが、タンブル弁板によって上側主通路に流入することがより抑制され、且つタンブル弁板の下板部側に導かれて、下板部に形成された切欠き部から下側副通路に流入し易くすることができる。
その構成によれば、下流側に向かうにつれて拡径する吸気路の内面テーパ部にアイドルエア通路の下流側出口を設けることで、アイドルエア通路の下流側通路が、吸気路の流れ方向に対する垂直水平方向視での閉弁時のタンブル弁のタンブル弁板と平行に形成しやすくなる。
その構成によれば、アイドルエア通路の下流側出口が。タンブル弁軸よりスロットル弁軸に近い位置に設けられたことで、アイドルエア通路の下流側出口とタンブル弁の下板部の切欠き部との距離をより大きくでき、アイドルエア通路から流れ出たアイドルエアをタンブル弁の下板部の切欠き部から下側副通路に流入し易くすることができる。
なお、本明細書の説明および請求の範囲における前後左右上下等の向きは、本実施形態に係る内燃機関の吸気構造を備えたパワーユニットを、車両に搭載した状態での車両の向きに従うものとする。本実施形態において車両は小型車両であり、具体的には自動二輪車である。
なお、図3、図4に示すスロットルボディ7の吸気路70、および吸気通路80に関しては、仕切板部81で仕切られた上側主通路80A側を「上」側、下側副通路80B側を「下」側として記載する。
また、図中矢印FRは車両前方を、LHは車両左方を、RHは車両右方を、UPは車両上方を、それぞれ示す。
本実施形態の自動二輪車1は、いわゆるスクータ型自動二輪車であり、車体前部1Aと車体後部1Bとが、低いフロア部1Cを介して連結されており、車体の骨格をなす車体フレーム2は、概ねダウンチューブ21とメインパイプ22(図2参照)とからなる。
すなわち、車体前部1Aのヘッドパイプ20からダウンチューブ21が下方へ延出し、ダウンチューブ21は下端で水平に屈曲してフロア部1Cの下方を後方へ延び、図2に示されるようにその後端において車幅方向に配設された連結フレーム23を介して、左右一対のメインパイプ22が連結され、メインパイプ22は連結フレーム23から傾斜部22aをなして斜め後方に立ち上がって、途中、傾斜をゆるめるように屈曲して後方に延びている。
一方、車体前部1Aにおいては、ヘッドパイプ20に軸支されて上方にハンドル14が設けられ、下方にフロントフォーク15が延びてその下端に前輪16が軸支されている。
パワーユニット3は、その前部が単気筒4ストロークサイクルの空冷式内燃機関(以下、単に「内燃機関」という。)30であり、クランクケース部50aを構成するパワーユニットケース50の前部に、クランク軸51を車幅方向に配して回転自在に軸支し、シリンダ軸Cを略水平に近い状態にまで大きく前傾した姿勢にあって、パワーユニットケース50の下端から前方に突出したハンガアーム52の端部が、メインパイプ22のブラケット24に取付けられたリンク部材25を介して上下揺動自在に連結される。
すなわち、パワーユニット3はいわゆるスイングユニットであり、パワーユニット3の後部の動力伝動ケース部55と、メインパイプ22の後部との間には図示しないリヤクッションが介装されている。
一方、シリンダヘッド32の下部から下方に延出した排気管38は、後方へ屈曲し右側に偏って後方に延びて後輪16の右側のマフラ39に接続される。
パワーユニット3における内燃機関30は、シリンダブロック31、シリンダヘッド32、シリンダヘッドカバー33の左半面の断面が示され、パワーユニットケース50は、左ケース半体50Lが、図示しない右ケース半体との合わせ面50bを図示手前に向けて示される。
減速ギヤ機構57は、動力伝達ケース部55の後部の右側開放面55Rの内部に収納され、図示しない減速機ケースにより覆われる。減速ギヤ機構57の出力軸は、後輪17の後車軸56である。
而して、内燃機関30のクランクケース部50aのクランク軸51の回転動力は、動力伝達ケース部55内のベルト式無段変速機と減速ギヤ機構57を介して、後輪17に伝達される。
シリンダブロック31のシリンダボア31a内に摺動自在に嵌合されるピストン34の頂面34aと、頂面34aが対向するシリンダヘッド32の燃焼室天井面32aとの間には燃焼室36が構成される。
動弁機構9を覆うように、シリンダヘッド32にはシリンダヘッドカバー33が重ねられて被せられる。
シリンダヘッドカバー33内の動弁機構9に動力伝達を行うため、図示しない無端状のカムチェーンが、クランクケース部50a、シリンダブロック31、シリンダヘッド32のクランク軸51方向の一方側に設けられた図示しないカムチェーン室を通って、カム軸91とクランク軸51との間に架設され、カム軸91はクランク軸51に同期して1/2の回転速度で回転する。
なお、シリンダヘッド32において前記カムチェーン室と反対側(クランク軸51方向の他方側)から燃焼室36内に向かって図示しない点火プラグが嵌挿されている。
吸気ポート42の上流端は、シリンダヘッド32の上方に向けて開口し、インレットパイプ6と接続して、連続した吸気通路80が構成され、インレットパイプ6の上流側に、スロットルボディ7が接続される。
排気ポート43の下流端は、シリンダヘッド32の下方に向けて開口し、排気管38(図2参照)に連結される。
また、シリンダヘッド32における排気ポート43の湾曲外壁部43aに一体に嵌着された排気弁ガイド45に摺動可能に支持された排気弁47が、排気ポート43の燃焼室36に臨む排気弁口41を開閉する。
すなわち、内燃機関30の吸気ポート42の上流端には、インシュレ-タ61を介してインレットパイプ6が接続して、連続した吸気通路80が構成され、インレットパイプ6の上流側に、スロットルボディ7が接続される。
スロットルボディ7は、内燃機関30の燃焼室36に連なる吸気通路80に連続する吸気路70を有し、その上流側は、コネクティングチューブ85を介して、エアクリーナ装置86(図2参照)に接続している。
また、吸気路70の流れ方向Fにおいてスロットル弁71の下流側には、吸気路70の流れ方向Fと垂直で略水平に配向しスロットル弁軸71aと平行なタンブル弁軸72aによってスロットルボディ7内に回転自在に軸支されたタンブル弁72を備えている。
スロットル弁71は、図3、図4図示において反時計回りに開弁方向に回転可能となっているとともに、図示しない復帰ばねにより、スロットル弁板71bが吸気路70の内面70aに接する全閉位置に位置するように閉弁方向に時計回りに付勢されている。
タンブル弁72は、図3、図4図示において反時計回りに開弁方向に回転可能となっているとともに、図示しない復帰ばねにより、タンブル弁板72bの上板部72baが吸気路70の内面70aに接するタンブル弁閉止位置に位置するように時計回りに閉弁方向に付勢されている。
タンブル弁閉止位置において、タンブル弁板72bの下板部72bbの切欠き部72cは、吸気路70にタンブル弁閉止時開通部70b(図4参照)を形成する。
仕切板部81は、インレットパイプ側仕切板部81Aと、インシュレータ側仕切板部81Bと、吸気ポート側仕切板部81Cが連続して位置して構成される。
上側主通路80A、下側副通路80Bは、インレットパイプ6と吸気ポート42を縦通する仕切板部81により、タンブル弁72下流側の吸気通路80を上下に区画することで各々、横断面略半円状に画成される。
なお、インレットパイプ6には、上側主通路80Aに上方外部から貫通して、吸気弁口40に向けて燃料を噴射供給するように配置された燃料噴射弁87が取り付けられる。
そのため、下側副通路80Bを流れる吸入空気を、図4中小矢印が示すように、吸気弁46の傘部46aの上方を通過させたうえで、シリンダボア31a内に流入させことができるため、燃焼室36内においてタンブル流Tが発生しやすくすることができる。すなわち、下側副通路80Bは、タンブル流Tを発生させるためのタンブル流路となる。
すなわち、タンブル弁閉止位置では、タンブル弁板72bの上板部72baが上側主通路80Aの入口開口80Aaを覆うように位置して吸気流の流入を抑制し、吸気流はタンブル弁板72bによって下板部72bbの切欠き部72cから下側副通路80B側に導かれるから、上側主通路80Aは実質的に閉じられる。
タンブル弁72が開方向に回転するにつれ上側主通路80Aへの吸気流の流入は増加するが、タンブル弁72が全開位置にあるときは、図4、図5中2点鎖線で示すように、スロットル弁板71bとタンブル弁板72bが吸気路70の流れ方向Fに平行に位置し、吸気路70を流れる吸気流は、スロットル弁71とタンブル弁72に邪魔されることなく、十分な吸気量が上側主通路80Aにも下側副通路80Bにも流れて、燃焼室36に向かうことができる。
アクセルグリップ75が操作されていない時は、復帰ばねによって閉弁されるが、内燃機関30のアイドル運転や極小負荷運転に必要な吸気量を供給するためのアイドルエア通路100が、吸気路70の上側に、スロットル弁71の上流側と、下流側とを連通するように、スロットルボディ7内に設けられており、アイドルエア通路100の下流側出口102は吸気路70の内面上部70aaに開口するように、スロットル弁71とタンブル弁72の間の内面テーパ部70cに設けられている。
アイドルエア通路100にはIACV(アイドルエアコントロール弁)101が介装されており、内燃機関30の運転状態に即してアイドルエアの供給量が制御される。
なお、アイドルエア通路100は吸気路70の上側に設けられたので、アイドルエア通路100に燃料のガス溜まりが発生し難くなり、アイドルエア通路100を吸気路70上に設けることができる。
また、タンブル弁72の下流側の吸気通路80を上下に区画することで、吸気流はタンブル弁72で下側副通路80Bのみを流通するよう制御されて燃焼室36に向かうこととなり、これにより、燃焼室36で発生する吸気のタンブル流Tを更に強めることができる。
なお、燃焼室36の吸気弁46の閉弁時は、そのように下側副通路80Bを通った吸気は、吸気弁46の傘部46a上方で、上側主通路80A側へゆっくり上昇する動きを示すので、吸気と燃料との混合気が吸気ポート42内で攪拌され、混合気が均質化される。
例えば、図7に示されるようなシリンダ軸Cの立ち上がった内燃機関、所謂縦型の内燃機関30′を備えた車載用のパワーユニット3′においても本発明に係る内燃機関の吸気構造は全く同様な効果を奏して適用される。
それを、実施形態2として以下説明する。
パワーユニットケース50′の後部には、クランク軸51と平行なメイン軸58a′、カウンタ軸58b′を有するギヤ変速装置58′が備えられ、カウンタ軸58b′が出力軸となっている。
したがって、実施形態2においても、図7図示のように実施形態1と同様の本発明の内燃機関の吸気構造が備えられ、同様の作用効果を奏することができる。
例えば、本実施形態1、2では、燃焼室にタンブル流を発生させる吸気構造であるが、燃焼室にスワール流を発生させる吸気構造に適用してもよい。
なお、説明の便宜上、図示の実施形態の左右配置のものについて説明したが、左右配置の異なるものであっても、発明の要旨の範囲であれば本発明に含まれる。
Claims (4)
- 燃焼室(36)を有する内燃機関(30,30′)が、シリンダブロック(31)とシリンダヘッド(32)を備え、前記シリンダヘッド(32)に吸気ポート(42)と排気ポート(43)が設けられ、
前記吸気ポート(42)にインレットパイプ(6)が接続されて連続した吸気通路(80)が構成され、
前記インレットパイプ(6)の吸気流上流側に前記吸気通路(80)に連続する吸気路(70)を備えたスロットルボディ(7)が接続し、同スロットルボディ(7)に、スロットル弁(71)と、前記吸気路(70)の吸気流流れ方向(F)において下流側のタンブル弁(72)とが設けられ、
前記吸気通路(80)が、前記タンブル弁(72)より下流側で、仕切板部(81)により上側主通路(80A)と、前記燃焼室(36)でのタンブル流を発生させるためのタンブル流路となる下側副通路(80B)とに仕切られた内燃機関の吸気構造において、
前記吸気路(70)の上側に前記スロットル弁(71)の上流側と下流側を連通するアイドルエア通路(100)が設けられ、同アイドルエア通路(100)は下流側出口(102)を有し、同下流側出口(102)は、前記吸気路(70)の内面上部(70aa)において前記スロットル弁(71)と前記タンブル弁(72)の間に設けられ、
前記タンブル弁(72)は、タンブル弁板(72b)とその切欠き部(72c)を有し、前記スロットル弁(71)の全閉時に前記アイドルエア通路(100)を通って流れ出たアイドルエアは、前記タンブル弁板(72b)により前記上側主通路(80A)への流入が抑制され、前記切欠き部(72c)から前記下側副通路(80B)に導かれるように構成されたことを特徴とする内燃機関の吸気構造。 - 前記アイドルエア通路(100)の前記下流側出口(102)に連なる下流側通路(103)が、前記吸気路(70)の流れ方向(F)に対する垂直水平方向視で閉弁時の前記タンブル弁(72)のタンブル弁板(72b)と平行になるように形成されたことを特徴とする請求項1に記載の内燃機関の吸気構造。
- 前記スロットル弁(71)の下流側の前記吸気路(70)に、下流側に向かうにつれて拡径する内面テーパ部(70c)が形成され、前記アイドルエア通路(100)の前記下流側出口(102)は、前記内面テーパ部(70c)に設けられたことを特徴とする請求項2に記載の内燃機関の吸気構造。
- 前記アイドルエア通路(100)の前記下流側出口(102)が、前記タンブル弁(72)のタンブル弁軸(72a)より前記スロットル弁(71)のスロットル弁軸(71a)に近い位置に設けられたことを特徴とする請求項1ないし請求項3のいずれか一項に記載の内燃機関の吸気構造。
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US20210381423A1 (en) * | 2020-06-03 | 2021-12-09 | Subaru Corporation | Engine |
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CN109707856B (zh) * | 2019-02-02 | 2021-07-16 | 联合汽车电子有限公司 | 阀体连接系统及废气再循环系统 |
JP7403707B2 (ja) * | 2021-02-18 | 2023-12-22 | 本田技研工業株式会社 | 内燃機関の吸気構造 |
WO2023053308A1 (ja) * | 2021-09-29 | 2023-04-06 | 本田技研工業株式会社 | 内燃機関の吸気装置 |
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Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54106719A (en) * | 1978-02-10 | 1979-08-22 | Yamaha Motor Co Ltd | Suction apparatus for multi-cylinder engine |
JPS5925878B2 (ja) | 1980-02-04 | 1984-06-21 | 三洋電機株式会社 | 密閉型圧縮機の消音装置 |
JPS61160539A (ja) * | 1985-01-07 | 1986-07-21 | Nissan Motor Co Ltd | 内燃機関の吸気路制御装置 |
JP2002070587A (ja) * | 2000-08-30 | 2002-03-08 | Mikuni Corp | 全閉角ゼロ度バルブを有するスロットルボディ |
JP2002221036A (ja) | 2001-01-26 | 2002-08-09 | Fuji Heavy Ind Ltd | エンジンの吸気装置 |
JP2006329016A (ja) * | 2005-05-24 | 2006-12-07 | Toyota Motor Corp | 内燃機関の吸気装置 |
JP2007068378A (ja) * | 2005-09-02 | 2007-03-15 | Denso Corp | モータアクチュエータ |
US20100162995A1 (en) * | 2008-12-26 | 2010-07-01 | Kwang Yang Motor Co., Ltd. | Throttle valve body and throttle valve device having the same |
WO2010081595A1 (de) * | 2009-01-13 | 2010-07-22 | Robert Bosch Gmbh | Drosselklappeneinrichtung |
JP2016061279A (ja) * | 2014-09-22 | 2016-04-25 | 本田技研工業株式会社 | 内燃機関の吸気構造 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6056261B2 (ja) * | 1978-07-14 | 1985-12-09 | ヤマハ発動機株式会社 | 燃料噴射式多気筒内燃機関 |
JP3217206B2 (ja) * | 1994-05-09 | 2001-10-09 | 株式会社日立製作所 | 内燃機関の吸気管 |
JP2007071163A (ja) * | 2005-09-08 | 2007-03-22 | Toyota Motor Corp | 内燃機関の吸気ポート構造 |
JP2015155684A (ja) * | 2014-02-21 | 2015-08-27 | トヨタ紡織株式会社 | 吸気ダクト |
-
2018
- 2018-02-27 WO PCT/JP2018/007227 patent/WO2018163912A1/ja active Application Filing
- 2018-02-27 JP JP2019504495A patent/JP6714764B2/ja active Active
- 2018-02-27 BR BR112019017635-7A patent/BR112019017635B1/pt active IP Right Grant
- 2018-02-27 EP EP18763803.6A patent/EP3594471B1/en active Active
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54106719A (en) * | 1978-02-10 | 1979-08-22 | Yamaha Motor Co Ltd | Suction apparatus for multi-cylinder engine |
JPS5925878B2 (ja) | 1980-02-04 | 1984-06-21 | 三洋電機株式会社 | 密閉型圧縮機の消音装置 |
JPS61160539A (ja) * | 1985-01-07 | 1986-07-21 | Nissan Motor Co Ltd | 内燃機関の吸気路制御装置 |
JP2002070587A (ja) * | 2000-08-30 | 2002-03-08 | Mikuni Corp | 全閉角ゼロ度バルブを有するスロットルボディ |
JP2002221036A (ja) | 2001-01-26 | 2002-08-09 | Fuji Heavy Ind Ltd | エンジンの吸気装置 |
JP2006329016A (ja) * | 2005-05-24 | 2006-12-07 | Toyota Motor Corp | 内燃機関の吸気装置 |
JP2007068378A (ja) * | 2005-09-02 | 2007-03-15 | Denso Corp | モータアクチュエータ |
US20100162995A1 (en) * | 2008-12-26 | 2010-07-01 | Kwang Yang Motor Co., Ltd. | Throttle valve body and throttle valve device having the same |
WO2010081595A1 (de) * | 2009-01-13 | 2010-07-22 | Robert Bosch Gmbh | Drosselklappeneinrichtung |
JP2016061279A (ja) * | 2014-09-22 | 2016-04-25 | 本田技研工業株式会社 | 内燃機関の吸気構造 |
Non-Patent Citations (1)
Title |
---|
See also references of EP3594471A4 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20210381423A1 (en) * | 2020-06-03 | 2021-12-09 | Subaru Corporation | Engine |
US11560828B2 (en) * | 2020-06-03 | 2023-01-24 | Subaru Corporation | Engine |
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