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WO2021192927A1 - Dispositif d'admission de moteur à combustion interne pour véhicule du type à selle - Google Patents

Dispositif d'admission de moteur à combustion interne pour véhicule du type à selle Download PDF

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Publication number
WO2021192927A1
WO2021192927A1 PCT/JP2021/008730 JP2021008730W WO2021192927A1 WO 2021192927 A1 WO2021192927 A1 WO 2021192927A1 JP 2021008730 W JP2021008730 W JP 2021008730W WO 2021192927 A1 WO2021192927 A1 WO 2021192927A1
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WO
WIPO (PCT)
Prior art keywords
passage
section
tumble
cross
intake
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/008730
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English (en)
Japanese (ja)
Inventor
治 江水
裕高 河津
加代子 武市
博行 夏井
金子　哲也
大地 月原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP2022509492A priority Critical patent/JP7241236B2/ja
Priority to BR112022016369-0A priority patent/BR112022016369B1/pt
Publication of WO2021192927A1 publication Critical patent/WO2021192927A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • 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
    • 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 device for an internal combustion engine mounted on a vehicle, particularly a saddle-mounted vehicle.
  • Patent Document 1 In the intake passage of an internal combustion engine, intake is provided with a tumble control valve that controls the intake supply to one side of the intake passage divided into two on the downstream side of the throttle valve to generate a tumble vortex in the air-fuel mixture in the combustion chamber.
  • Patent Document 1 the intake passage having a circular cross section is divided into two by a flat plate-shaped partition member, and the cross section of the tumble passage for supplying intake air for generating a tumble vortex is half. It was circular and there was room for improvement in order to increase the intake speed.
  • Patent Document 2 below shows a circular cross section of a tumble passage having a low pipeline resistance.
  • the tumble control valve since the tumble control valve is provided around the entrance of the tumble passage, the size of the circular cross section of the entrance of the tumble passage is limited, and the amount of intake air to the tumble passage is restricted. I was afraid.
  • Japanese Patent Application Laid-Open No. 2016-07206 (FIGS. 4, 7, 11 to 13) Japanese Patent No. 6268604 (Fig. 2, Fig. 4, Fig. 6)
  • the present invention has been made in view of such prior art.
  • an intake control valve such as a tumble control valve in addition to a throttle valve and a tumble passage provided in the intake passage
  • an intake device that can secure intake air to the tumble passage and improve the intake speed is provided. The task is to do.
  • a throttle valve provided in the intake passage through which the intake air to the combustion chamber of the internal combustion engine passes and controlled to an arbitrary opening degree to control the intake air amount, and a throttle valve provided on the downstream side of the throttle valve and along the passage direction.
  • An internal combustion engine for a saddle-type vehicle provided with a tumble control valve that opens and closes the passage cross section of the main passage of the intake passage divided into a main passage and a tumble passage to control the intake air supply to the main passage.
  • the intake passage is provided with a partition wall that divides the inside into two in the passage direction, and the tumble passage is defined as a circular cross section by the partition wall whose cross section on the downstream end side is arcuate to the downstream end, and crosses the upstream end.
  • the partition wall having a straight surface is defined as a semicircular shape having a maximum diameter larger than the diameter of the circular cross section, and the cross-sectional area of the cross section of the upstream end is the cross-sectional area of the cross section on the downstream end side.
  • the cross-sectional area of the cross section of the upstream end of the tumble passage is secured without increasing the diameter of the entire cross-sectional shape of the intake passage, the inflow flow rate of the intake air to the tumble passage can be secured, and the tumble passage on the downstream end side is secured. Since the cross section of the cross section is a circular cross section with low pipeline resistance, the flow velocity of the intake air flowing through the tumble passage can be increased, and the tumble performance is improved.
  • the cross section of the tumble passage is gradually deformed and continuous along the passage direction from the semicircular cross section of the upstream end to the cross section of the circular cross section on the downstream end side. Therefore, in the tumble passage, the cross section is gradually deformed from the semicircular cross section to the circular cross section, and the cross section area is narrowed, so that the flow velocity can be increased while suppressing the increase in intake resistance as much as possible. ..
  • the tumble passage has a circular cross section up to the downstream end in a cross section within a predetermined length range on the downstream end side. Therefore, by providing a tumble passage having a circular cross section with a predetermined length to the downstream end, a rectifying section is provided, and the intake air is rectified and the intake performance is improved.
  • the tumble valve plate of the tumble control valve is formed in a semicircular shape that covers the entire cross section of the main passage. Therefore, since the tumble control valve can surely close the main passage side, the intake flow rate to the tumble passage side can be secured.
  • the tumble passage is curved so that the central extension virtual line at the downstream end points toward the cylinder center. ing. Therefore, the intake air that passes through the tumble passage and flows into the combustion chamber can be guided toward the center of the cylinder, so that a tumble flow can be generated in the center of the combustion chamber, and the tumble performance is improved.
  • the intake device of the internal combustion engine for a saddle-type vehicle of the present invention According to the intake device of the internal combustion engine for a saddle-type vehicle of the present invention.
  • the cross-sectional area of the cross section of the upstream end of the tumble passage is secured without increasing the diameter of the entire cross-sectional shape of the intake passage, the inflow flow rate of the intake air to the tumble passage can be secured, and the tumble passage on the downstream end side is secured. Since the cross section of the cross section is a circular cross section with low pipeline resistance, the flow velocity of the intake air flowing through the tumble passage can be increased, and the tumble performance is improved.
  • FIG. 1 is a plan sectional view of a central main part of a motorcycle as viewed from the arrow III-III in FIG.
  • FIG. 3 is a right perspective view of the central main part of the motorcycle when the fuel tank, the seat, and the rear side cover are removed, and the periphery of the tumble valve device, the throttle body, and the connecting tube is viewed from diagonally above on the right side, as viewed from the IV arrow in FIG. ..
  • FIG. 2 is a plan sectional view of a throttle body, a tumble valve device, and a cylinder head along an intake passage according to VI-VI arrow view in FIG.
  • FIG. 2 is a cross-sectional perspective view of the throttle body, the tumble valve device, and the cylinder head as viewed from the rear upper part, as viewed from the arrow of VII-VII in FIG.
  • the internal combustion engine is mounted on a saddle-mounted vehicle, and in the present embodiment, the saddle-mounted vehicle is a motorcycle.
  • the orientations of the front, rear, left, right, up and down, etc. in the description of the present specification and the claims shall be in accordance with the orientation of the saddle-type vehicle such as a motorcycle equipped with the internal combustion engine of the present embodiment.
  • the arrow FR indicates the front of the vehicle
  • LH indicates the left side of the vehicle
  • RH indicates the right side of the vehicle
  • UP indicates the upper part of the vehicle.
  • FIG. 1 is a right side view of the motorcycle 1 according to the embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of the right side of the internal combustion engine mounted on the motorcycle 1 in FIG.
  • the body frame 2 of the motorcycle (“saddle-mounted vehicle” in the present invention) 1 extends downward from the head pipe 20 constituting the front end and the head pipe 20 and then curves and extends further downward.
  • One main frame 21 having a hanging portion 21a, a pair of left and right seat rails 22 extending rearward from the curved portion of the main frame 21, and one down extending downward from the head pipe 20 in the center of the vehicle width.
  • a front fork 12 that supports the front wheel 11 is rotatably attached to the head pipe 20, and a fuel tank 13 is attached to the main frame 21.
  • a swing arm 14 is supported on the pivot plate 24 so as to be swingable up and down. Further, the seat 15 and a pair of left and right rear side covers 10a are attached to the seat rail 22.
  • a front cowl 10b equipped with a headlight, a front winker, etc. is supported in front of the head pipe 20.
  • a front fender 10c that covers the front wheel 11 from above is supported at the lower part of the front fork 12.
  • the swing arm 14 rotatably supports the rear wheel 16 at the rear end.
  • the lower end of the rear cushion unit 17 is attached to the rear portion of the swing arm 14, and the upper end of the rear cushion unit 17 is attached near the connection portion between the rear frame 25 and the seat rail 22.
  • Seat 15 is formed into a two-person tandem seat that is long before and after the driver and passengers can sit.
  • a side stand 19 for parking the motorcycle 1 and a center stand (not shown) At the bottom of the pivot plate 24, a side stand 19 for parking the motorcycle 1 and a center stand (not shown), a step 18A on which the driver puts his foot, and a step bracket 18C supporting the pillion step 18B on which the passenger puts his foot, etc. Is attached.
  • An engine hanger 26 is fixed to the lower part of the down frame 23, and the engine hanger 26 and a pair of left and right pivot plates 24 support a power unit 4 having an internal combustion engine 3 and a transmission 5 integrally.
  • the internal combustion engine 3 includes a crankcase 30 that houses the crankshaft 31, and a cylinder portion 32 that is fastened to the upper portion of the crankcase 30 with the cylinder axis X slightly tilted forward.
  • the cylinder portion 32 includes a cylinder block 33, a cylinder head 34, and a head cover 35 from the crankcase 30 side.
  • the internal combustion engine 3 is arranged in a region surrounded by the main frame 21 and the down frame 23 in a side view.
  • the cylinder block 33 is attached to the crankcase 30 so as to stand up with a slight forward tilt, the front portion of the crankcase 30 is supported by the engine hanger 26, and the rear portion of the crankcase 30 is supported by the pivot plate 24.
  • a throttle body 8 is connected to the rear surface of the cylinder head 34 via a tumble valve device 7, and an air cleaner 86 is connected to the upstream of the throttle body 8 via a connecting tube 85.
  • An exhaust pipe 39 is connected to the front surface of the cylinder head 34, and a muffler 40 is connected to the downstream side of the exhaust pipe 39.
  • the air cleaner 86 is arranged in a laterally triangular area surrounded by the seat rail 22, the main frame 21, and the rear frame 25. The upper half of the air cleaner 86 is covered on both the left and right sides with a pair of left and right rear side covers 10a made of a resin material.
  • the rear side cover 10a overlaps a part of the rear part of the fuel tank 13 in a side view, extends rearward from the rear part of the fuel tank 13, extends below the seat 15, and extends to the rear lower end of the seat 15. As shown in FIG. 1, the rear side cover 10a covers the rear lower portion of the fuel tank 13 and the lower edge of the seat 15 invisible to the outside, and the appearance is improved. Further, the rear side cover 10a covers the outside of the seat rail 22 in the vehicle width direction, thereby improving the appearance.
  • reference numeral 10d is a rear fender.
  • FIG. 2 is a cross-sectional view of the right side of the power unit 4 taken out from the power unit 4 of FIG. 1 and shown in substantially the same orientation as shown in FIG.
  • the cylinder block 33, the cylinder head 34, and the head cover 35 forming the cylinder portion 32 are crankcases with the cylinder axis X slightly tilted forward so that the cross section of the left half surface is shown in FIG. It is provided on 30.
  • the crankcase 30 is shown with the left case half body 30L facing the mating surface 30a with the right case half body (not shown) toward the front side of the drawing.
  • a transmission 5 having a main shaft 51 and a counter shaft 52 parallel to the crankshaft 31 is provided inside the rear portion of the crankcase 30, a transmission 5 having a main shaft 51 and a counter shaft 52 parallel to the crankshaft 31 is provided inside the rear portion of the crankcase 30, a transmission 5 having a main shaft 51 and a counter shaft 52 parallel to the crankshaft 31 is provided.
  • the rotation of the crankshaft 31 accompanying the operation of the internal combustion engine 3 is transmitted to the main shaft 51 via a speed change clutch (not shown), and is shifted by a speed change gear group (not shown) provided on the main shaft 51 and the counter shaft 52 to counter the counter. It is transmitted to the shaft 52.
  • the counter shaft 52 is an output shaft of the internal combustion engine 3, that is, the power unit 4, and includes a drive sprocket 53 fitted to the left shaft end of the counter shaft 52 and a driven sprocket 54 fitted to the rear wheel shaft 16a.
  • a drive chain 55 is hung between the two, and the rear wheels 16 are driven
  • the piston 36 that reciprocates in the cylinder bore 33a of the cylinder block 33 is connected to the crankpin 31a of the crankshaft 31 by a connecting rod 37.
  • a combustion chamber 38 is formed between the top surface 36a of the piston 36 slidably fitted in the cylinder bore 33a of the cylinder block 33 and the combustion chamber ceiling surface 34a of the cylinder head 34 facing the top surface 36a. Will be done.
  • the internal combustion engine 3 employs a single-cylinder SOHC type two-valve system, and the cylinder head 34 is provided with a valve operating mechanism 9.
  • a head cover 35 is overlapped and covered on the cylinder head 34 so as to cover the valve operating mechanism 9.
  • an endless cam chain (not shown) is provided on one side of the crankcase 30, the cylinder block 33, and the cylinder head 34 in the crankshaft 31 direction (in the present embodiment, the figure). 2 Passing through a cam chain chamber (not shown) provided on the opposite side (not shown), the cam shaft 91 is hung between the cam shaft 91 and the crank shaft 31, and the cam shaft 91 synchronizes with the crank shaft 31 and has a rotation speed of 1/2 of that.
  • the spark plug 88 is inserted from the side opposite to the cam chain chamber (the other side in the direction of the crankshaft 51, the front side shown in FIG. 2 in the present embodiment) toward the inside of the combustion chamber 38 ( (See FIG. 4).
  • the exhaust port 44 and the intake port 43 are separated from each other back and forth from the exhaust valve port 42 and the intake valve port 41 when the cylinder head 34 is opened to the ceiling surface 34a of the combustion chamber. It is formed by extending while curving in the direction.
  • the upstream end of the intake port 43 opens toward the rear of the cylinder head 34, is connected to the tumble valve device 7 with a heat insulating plate member 62 sandwiched between them, and is connected to the tumble valve device 7 on the upstream side of the tumble valve device 7 via an elastic insulator 61.
  • the throttle body 8 is connected.
  • An air cleaner 86 is sequentially connected to the upstream side of the throttle body 8 via a connecting tube 85 (see FIG. 1). That is, the intake air is burned from the air cleaner 86 through the connecting tube 85, the air passage 80 of the throttle body 8, the air passage 60 of the elastic insulator 61, the air passage 70 of the tumble valve device 7, the opening 63 of the heat insulating plate member 62, and the intake port 43.
  • a continuous intake passage 6 that feeds to the chamber 38 is configured.
  • the elastic insulator 61 is formed of a rubber member having heat insulating properties and elasticity as a preferable example shown in the present embodiment.
  • the elastic insulator 61 may be a mixture of metal members and resin members as long as it has a member structure having heat insulating properties and elasticity, and another member is connected to the member having heat insulating properties and elasticity to form a connecting tubular structure. It may be the one that has been done.
  • the downstream end of the exhaust port 44 opens toward the front of the cylinder head 34 and is connected to the exhaust pipe 39.
  • the exhaust pipe 39 wraps around below the power unit 4, and then the muffler 40 on the right side of the rear wheel 16 Connect to (see Figure 1).
  • a cylindrical intake valve guide 45 is integrally fitted to the curved outer wall portion 43a of the intake port 43 in the cylinder head 34, and the intake valve 47 slidably supported by the intake valve guide 45 burns the intake port 43.
  • the intake valve port 41 facing the chamber 38 is opened and closed.
  • the exhaust valve 48 slidably supported by the exhaust valve guide 46 integrally fitted to the curved outer wall portion 44a of the exhaust port 44 in the cylinder head 34 faces the combustion chamber 38 of the exhaust port 44. Open and close the mouth 42.
  • the intake valve 47 and the exhaust valve 48 are urged upward by the valve spring 49 so that the umbrella portions 47a and 48a both close the intake valve port 41 and the exhaust valve port 42 facing the combustion chamber 38.
  • the intake cam of the cam shaft 91, the intake rocker arm 93 that swings in contact with the exhaust cam, and the exhaust rocker arm 94 push down the stem ends 47b and 48b of the intake valve 47 and the exhaust valve 48, and the intake valve 47,
  • the exhaust valve 48 opens, and the intake port 43 and the combustion chamber 38 communicate with each other, and the exhaust port 44 and the combustion chamber 38 communicate with each other to perform intake and exhaust at predetermined timings.
  • a tumble flow T of the fuel / air mixture that is, an intake device for giving vertical rotation in the combustion chamber 38.
  • the throttle body 8 is rotatably supported in the throttle body 8 by a throttle valve shaft 81a oriented substantially horizontally perpendicular to the flow direction F of the air passage 80, that is, the intake passage 6, and is controlled to an arbitrary opening degree. It is provided with a throttle valve 81 that can variably control the passage area of the air passage 80, control the amount of intake air, and open and close the air passage 80.
  • the ventilation passage 70 of the tumble valve device 7 is connected to the downstream side of the throttle valve 81, and is perpendicular to the ventilation passage 70, that is, the flow direction F of the intake passage 6, and substantially horizontal.
  • a tumble control valve 71 that is rotatably supported in the tumble valve device 7 by a tumble valve shaft 71a that is oriented and parallel to the throttle valve shaft 81a and is controlled to an arbitrary opening degree is provided.
  • the intake passage 6 on the downstream side of the tumble control valve 71 is divided into a main passage 6A and a tumble passage 6B by the partition wall 65 along the passage direction, and the tumble control is adjacent to the upstream end portion 65a of the partition wall 65.
  • a tumble valve shaft 71a of the valve 71 is provided.
  • the tumble control valve 71 provided in the ventilation passage 70 having a circular cross section on the downstream side of the throttle valve 81 is a butterfly type, and is bolted and fixed so as to rotate together with the tumble valve shaft 71a and the tumble valve shaft 71a. It has a semicircular tumble valve plate 71b above.
  • the tumble control valve 71 can rotate counterclockwise in the valve opening direction in FIG. 2, and a return spring (not shown) brings the tumble valve plate 71b into the tumble valve closing position where the tumble valve plate 71b contacts the inner surface 70a of the ventilation path 70. It is urged clockwise to be positioned in the valve closing direction.
  • the throttle valve 81 provided in the intake passage 6 of the throttle body 8, that is, the ventilation passage 80 is also a butterfly type, and is a disk fixed by bolting so as to rotate together with the throttle valve shaft 81a and the throttle valve shaft 81a. It has a shaped throttle valve plate 81b.
  • the throttle valve 81 can rotate clockwise in the drawing of FIG. 2 in the valve opening direction, and the throttle valve plate 81b is positioned at a fully closed position in contact with the inner surface 80a of the ventilation path 80 by a return spring (not shown). It is urged counterclockwise in the valve closing direction.
  • the intake passage 6 is mainly divided from the tumble valve device 7 to the intake port 43 by a partition wall 65 up and down, except for the tumble passage 6B defined on the lower side and the tumble passage 6B. It is partitioned into passage 6A.
  • the partition wall 65 is configured such that the tumble valve device side partition wall 65A having the upstream end portion 65a, the heat insulating plate member side partition wall 65B, and the intake port side partition wall 65C are continuously positioned.
  • the cross sections A, D, and F of the tumble passage 6B are changed by the partition wall 65 that runs vertically from the tumble valve device 7 to the intake port 43. That is, at the inlet portion 43b of the intake port 43 near the upstream end portion 65a of the partition wall 65, the intake passage 6 is divided into upper and lower parts, so that the intake passage 6 is defined in a substantially semicircular shape on the lower side as shown in the cross section A. NS.
  • the main passage 6A and the tumble passage 6B are partitioned from the upstream end portion 65a of the partition wall 65 to the inlet portion 43b of the intake port 43 as shown in the cross section A.
  • the cross section of the intake port side partition wall 65C changes in an arc shape as it advances to the downstream side, and as shown in the cross section D, the cross section of the tumble passage 6B is formed so as to form a circular cross section. Will be done. Further, the cross section of the tumble passage 6B is maintained as a circular cross section as shown in the cross section F up to the downstream end portion 65b of the intake port side partition wall 65C.
  • the center line Z in the side view of the tumble passage 6B from the cross section D to the cross section F is between the opening edge 41a of the intake valve port 41 near the exhaust valve port 42 and the umbrella portion 47a of the intake valve 47. It is set to point towards.
  • the throttle body 8 penetrates the intake passage 6 on the downstream side of the throttle valve 81, that is, the ventilation passage 80 from above and outside, and injects and supplies fuel toward the diagonally downstream side (schematically in FIG. 2).
  • a fuel injection valve 87 arranged as shown in the injection line J) is installed.
  • the intake air flowing through the tumble passage 6B is passed above the umbrella portion 47a of the intake valve 47, and then is inside the cylinder bore 32a from between the intake valve port 41 and the opening edge 41a on the side close to the exhaust valve port 42. Since it can be efficiently flowed into the combustion chamber 38, the tumble flow T can be easily generated in the combustion chamber 38. That is, the tumble passage 6B serves as an intake flow path for generating the tumble flow T.
  • the tumble control valve 71 is a pair of upper and lower main passages 6A that divide the intake air flow in the intake passage 6 on the downstream side of the tumble valve plate 71b provided above, and the main passage 6A of the tumble passages 6B.
  • the passage cross section is opened and closed to control the intake air supply to the main passage 6A, and the intake distribution between the main passage 6A and the tumble passage 6B of the intake passage 6 is controlled.
  • the tumble valve plate 71b forming a semicircle on the upper part of the tumble valve shaft 71a abuts on the upper part of the inner surface 70a of the ventilation passage 70 having a circular cross section, so that the tumble valve plate 71b Is located so as to cover the inlet opening 6Aa of the main passage 6A to close or suppress the inflow of the intake air flow, the intake air flow is guided to the tumble passage 6B side, the intake air from the tumble passage 6B, and the fuel from the fuel injection valve 87. As an air-fuel mixture, it flows into the cylinder bore 32a.
  • the throttle valve 81 When the internal combustion engine 3 is in low load operation, the throttle valve 81 is throttled to reduce the amount of intake air, but the tumble control valve 71 allows most of the intake air to pass through the tumble passage 6B, so that the intake air flow velocity flows into the combustion chamber 38. It becomes possible to maintain good fuel combustion in the combustion chamber 38 while strengthening the tumble flow T of the intake air generated in the combustion chamber 38.
  • the tumble flow T shown by the alternate long and short dash line in FIG. 2 schematically shows the tumble flow T in the combustion chamber 38 when the piston 36 descends in the cylinder bore 33a as shown by the alternate long and short dash line. ..
  • the throttle valve 81 opens and the intake air amount increases, but the tumble control valve 71 is rotated in the opening direction to increase the inflow of the intake air flow into the main passage 6A.
  • the throttle valve 81 and the tumble control valve 71 are located parallel to the flow direction F of the intake passage 6 as shown by the two-point chain line in FIG. 2, and the intake flow flowing through the intake passage 6 is tumbled with the throttle valve 81.
  • a sufficient amount of intake air flows to both the main passage 6A and the tumble passage 6B without being disturbed by the control valve 71, and both of them, accompanied by the fuel from the fuel injection valve 87, can be directed to the combustion chamber 38 as an air-fuel mixture. can.
  • the throttle valve 81 is rotated by an engine control unit (ECU) (not shown) that activates the actuator 82 of the throttle valve 81 based on the operation of the driver and the situation of the internal combustion engine 3, and the valve is positioned. , Opening and closing.
  • the actuator 82 is mainly composed of an electric motor, but as shown in FIGS. 2 and 4, the throttle valve shaft 81a and the electric motor shaft, that is, the actuator shaft center 82a are offset, so that between them. Is provided with an appropriate transmission unit 83 such as a gear mechanism (see FIG. 3).
  • the tumble control valve 71 is rotated by an engine control unit (ECU) (not shown) that activates the actuator 72 of the tumble control valve 71 based on the situation of the internal combustion engine 3, and the valve is positioned and opened / closed.
  • the actuator 72 mainly includes an electric motor.
  • FIG. 3 which is a plan sectional view of the central main part of the motorcycle 1 as viewed from the arrow III-III in FIG. 1, in the present embodiment, the intake port 43 opened at the rear portion of the cylinder head 34 is provided with the intake port 43.
  • the tumble valve device 7 is fastened and connected with the heat insulating plate member 62 interposed therebetween.
  • the upstream side of the intake air flow is connected to the throttle body 8 via the elastic insulator 61, and the connecting tube 85 is further connected to the upstream side of the throttle body 8 to be connected to the air cleaner 86.
  • the main body 8a see FIGS.
  • FIG. 3 regarding the throttle body 8, the actuator 82 and the transmission portion 83 to the throttle valve shaft 81a are shown as a cross section, and the main body 8a of the throttle body 8 including the throttle valve 81 is located above the actuator 82. .. Further, regarding the tumble valve device 7, the actuator 72, the air passage 70, and the tumble control valve 71 are shown as cross sections.
  • FIG. 4 the fuel tank 13, the seat 15, and the rear side cover 10a were removed, and the periphery of the tumble valve device 7, the throttle body 8, and the connecting tube 85 was viewed from diagonally above to the right, as viewed from the IV arrow in FIG. It is a right side perspective view of the central main part of a motorcycle 1.
  • the upstream side of the connecting tube 85 connected to the upstream side of the main body 8a of the throttle body 8 provided with the throttle valve 81 is connected to the side surface 86b of the air cleaner 86, that is, the surface facing the vehicle side.
  • the intake passage 6 passing through the tumble valve device 7 and the throttle body 8 becomes long and connecting. If you try to connect the tube 85 to the front side 86a side of the air cleaner 86 as in the past, the distance between the cylinder part 32 and the air cleaner 86 is set too long and the vehicle body becomes large, or the cylinder part 32 and the air cleaner 86 If the connecting tube 85 itself having a pipe portion forming the intake passage 6 between them, or the connection between the tumble valve device 7 and the throttle body 8 is bent and the angle becomes tight, the intake performance may be affected.
  • the connecting tube 85 can be smoothly connected even at a distance between the normal cylinder portion 32 and the air cleaner 86, and the intake air flow becomes smooth and the intake air can be taken. Since it is rectified, the intake performance is improved.
  • the tumble valve device 7 which is fastened and connected to the intake port 43 at the rear of the cylinder head 34 across the heat insulating plate member 62 and the throttle body 8 are connected as a connecting pipe. It is relay-connected by the elastic insulator 61 of. That is, it constitutes at least a part of the intake passage 6 between the throttle body 8 provided with the throttle valve 81 and the tumble valve device 7 provided with the tumble control valve 71, that is, fluidly relays and has heat insulating properties.
  • an elastic insulator 61 as a connecting pipe having elasticity that allows relative displacement between the throttle body 8 and the tumble valve device 7 is provided.
  • FIG. 5 shows the cross section of the space itself of the intake port 43 forming the intake passage 6 partitioned by the main passage 6A and the tumble passage 6B shown in FIG. 2 as if it were an object.
  • the vertical cross section shown in the upper part of the drawing is the intake port 43 forming the intake passage 6 divided into the main passage 6A and the tumble passage 6B by the intake port side partition wall 65C in FIG.
  • the cross section A of the intake passage 6 is a cross section at the inlet portion 43b of the intake port 43, similarly to the cross section A in FIG. 2, and is a cross section of the intake passage 6 at the upstream end portion 65C of the partition wall 65C on the intake port side. It is a face.
  • the intake passage 6 is a partition wall 65C on the intake port side of the upstream end portion 65Ca having a straight cross section, and the tumble passage 6B is defined in a substantially semicircular shape below the entire cross section of the intake passage 6.
  • the tumble valve device side partition wall 65A and the heat insulating plate member side partition wall 65B form the main passage 6A as shown in the cross section A. It is separated from the tumble passage 6B.
  • the cross section of the partition wall 65C on the intake port side is gradually deformed into an arc shape
  • the tumble passage 6B is gradually deformed into a horizontally long oval cross section, and further deformed into a circular cross section.
  • It is a cross section. Similar to the cross section D in FIG. 2, the cross section D is a cross section of the intake port 43 in which the tumble passage 6B on the downstream end 6Bb side is defined as a circular cross section by the arc-shaped intake port side partition wall 65C. ..
  • the cross section E indicates that the tumble passage 6B is maintained in a circular cross section by the intake port side partition wall 65C having an arcuate cross section even on the downstream side of the cross section D.
  • the tumble passage 6B has a downstream end 6Bb so that the cross section F of the intake port 43 at the downstream end 6Bb of the tumble passage 6B at the downstream end 65b of the intake port side partition wall 65C is shown by a chain double-dashed line in FIG.
  • the cross section on the side is defined as a circular cross section by the intake port side partition wall 65C having an arc shape up to the downstream end portion 65b of the intake port side partition wall 65C.
  • the intake passage 6 after the tumble passage 6B merges with the main passage 6A, that is, the intake port 43 has a substantially circular cross section and faces the intake valve port 41.
  • the cross section of the upstream end 6Ba (see FIG. 2) of the tumble passage 6B is the tumble valve device side partition wall 65A having a linear cross section as in the cross section A, and the downstream end 6Bb (see FIG. 5) side.
  • the maximum diameter is larger than the diameter of the circular cross section (see cross section D to F) in a semicircular shape, and the cross section area of the cross section of the upstream end 6Ba of the tumble passage 6B is the downstream end. It is formed larger than the cross-sectional area of the circular cross section on the 6Bb side.
  • the cross-sectional area of the upstream end 6Ba of the tumble passage 6B has the same cross-sectional area as the cross-sectional area A without increasing the diameter of the entire cross-sectional shape of the intake passage 6 and the inflow of intake air into the tumble passage 6B. Since the cross section of the tumble passage 6B on the downstream end 6Bb side (see cross section D to cross section F) is a circular cross section with low pipeline resistance, the flow velocity of the intake air flowing through the tumble passage 6B can be increased. It can be done, and the tumble performance is improved.
  • the cross section of the tumble passage 6B from the semicircular cross section (see cross section A) of the upstream end 6Ba (see FIG. 2) to the circular cross section on the downstream end 6Bb (see FIG. 5) side (see cross section D). Up to, it is gradually deformed and continuous along the passage direction (see cross section B and cross section C). As described above, the tumble passage 6B is gradually deformed from the semicircular cross section (see cross section A) to the circular cross section (see cross section D), and the cross section area is narrowed. It is possible to increase the flow velocity of the intake air in the tumble passage 6B while suppressing the increase in the intake air resistance as much as possible.
  • the tumble passage 6B has a circular cross section (see cross section D to cross section F) in a predetermined length range on the downstream end 6Bb side up to the downstream end 6Bb.
  • the rectifying section is provided by providing the tumble passage 6B having a circular cross section with a predetermined length up to the downstream end 6Bb, so that the intake air is rectified and the intake performance is improved.
  • the tumble valve plate 71b of the tumble control valve 71 is formed in a semicircular shape, and the rotating end corresponds to the inner surface 70a of the ventilation passage 70 having a circular cross section of the tumble valve device 7. In contact with each other, the entire cross section of the main passage 6A (see cross section A) can be closed. Therefore, since the tumble control valve 71 can surely close the main passage 6A side, the intake flow rate to the tumble passage 6B side is secured during the low load operation of the internal combustion engine 3.
  • FIG. 6 is a plan sectional view of the throttle body 8, the tumble valve device 7, and the cylinder head 34 along the intake passage 6 as viewed by VI-VI in FIG.
  • FIG. 7 is a cross-sectional perspective view of the throttle body 8, the tumble valve device 7, and the cylinder head 34 as viewed from the rear upper part, as viewed from the arrow of VII-VII in FIG.
  • the air passage 80 of the throttle body 8, the air passage 60 of the elastic insulator 61, the air passage 70 of the tumble valve device 7, and the intake port 43 of the cylinder head 34 are viewed from above.
  • a linearly continuous intake passage 6 is formed, and the downstream end 43c of the intake port 43 reaches the intake valve port 41.
  • the virtual line M between the valve openings that connects the center of the intake valve port 41 and the center of the exhaust valve port 42 intersects the cylinder axis X in the direction of the cylinder axis X.
  • the intake port 43 is provided so as to be inclined with respect to the virtual line M between the center of the valve openings in the direction of the cylinder axis X, and the downstream end 6b of the intake passage 6 leading to the intake valve port 41.
  • the center extension virtual line I of the downstream end 43c of the intake port 43 has an inclination angle ⁇ with respect to the valve port center-to-center virtual line M and points to the left and right centers of the intake valve port 41, but points to the cylinder center O. do not.
  • the tumble passage 6B for sending the intake air for improving the fuel combustion in the combustion chamber 38 is on the left and right of the intake valve port 41.
  • the tumble passage 6B of the present embodiment is curved with respect to the direction of the intake port 43, and is formed so that the center extension virtual line U of the downstream end 6Bb points toward the cylinder center O in the direction of the cylinder axis X. Has been done. Therefore, since the intake air that has passed through the tumble passage 6B and flows into the combustion chamber 38 can be guided toward the cylinder center O, a tumble flow T can be generated in the center of the combustion chamber 38, and the tumble performance is improved.
  • the present invention is not limited to the above-described embodiment, and various design changes can be made without departing from the gist thereof, and the scope of the gist of the present invention. It goes without saying that saddle-type vehicles, internal combustion engines, and the like are implemented in various modes. For convenience of explanation, the left-right arrangement of the illustrated embodiment has been described, but even if the left-right arrangement is different, it is included in the present invention as long as it is within the scope of the gist of the invention.
  • 1 motorcycle ("saddle-type vehicle" in the present invention)
  • 2 ... body frame, 3 ... internal combustion engine, 4 ... power unit, 5 ... transmission, 6 ... intake passage, 6A ... main passage, 6Aa ... entrance opening, 6B ... tumble passage, 6Ba ... upstream end, 6Bb ... downstream end, 7 ... tumble valve device, 8 ... throttle body, 8a ... body, 20 ... head pipe, 21 ... main frame, 21a ... hanging, 23 ... down frame, 24 ... Pivot plate, 26 ... Engine hanger, 30 ... Crank case, 31 ... Crank shaft, 32 ... Cylinder part, 33 ... Cylinder block, 33a ... Cylinder bore, 34 ...

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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)

Abstract

La présente invention assure l'admission d'air dans un passage de culbutage et améliore une vitesse d'admission dans un moteur à combustion interne pour un véhicule du type à selle, le moteur comprenant une soupape d'étranglement et une soupape de commande de culbutage, et un passage de culbutage étant fourni à un passage d'admission. Un dispositif d'admission d'un moteur à combustion interne pour un véhicule du type à selle comprend une soupape d'étranglement (81) qui est fournie à un passage d'admission (6) d'un moteur à combustion interne (3) et qui est commandée à un degré d'ouverture discrétionnaire pour commander la quantité d'air admis, et une soupape de commande de culbutage (71) qui est fournie en aval de la soupape d'étranglement et commande l'alimentation en air d'admission vers un passage principal (6A) du passage d'admission, qui est divisé en passage principal et passage de culbutage (6B); le passage d'admission étant doté d'une paroi de séparation (65) qui divise l'intérieur du passage d'admission en deux dans la direction de passage; et le passage de culbutage étant configuré de sorte qu'une section transversale sur un côté extrémité aval (6Bb) est formée en une section transversale circulaire par une paroi de séparation arquée jusqu'à l'extrémité aval (6Bb), une section transversale d'une extrémité amont (6Ba) est formée par une paroi de séparation linéaire en une forme semi-circulaire présentant un diamètre maximal supérieur au diamètre de la section transversale circulaire, et la zone de section transversale de la section transversale de l'extrémité amont est supérieure à la zone de section transversale de la section transversale sur le côté d'extrémité aval.　
PCT/JP2021/008730 2020-03-26 2021-03-05 Dispositif d'admission de moteur à combustion interne pour véhicule du type à selle Ceased WO2021192927A1 (fr)

Priority Applications (2)

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JP2022509492A JP7241236B2 (ja) 2020-03-26 2021-03-05 鞍乗型車両用内燃機関の吸気装置
BR112022016369-0A BR112022016369B1 (pt) 2020-03-26 2021-03-05 Dispositivo de admissão de motor de combustão interna para veículo do tipo para conduzir montado em selim

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JP2020-056645 2020-03-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024202016A1 (fr) * 2023-03-31 2024-10-03 本田技研工業株式会社 Structure d'entrée d'air pour moteur à combustion interne

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08128327A (ja) * 1994-11-04 1996-05-21 Isuzu Motors Ltd 内燃機関の低負荷時スワール発生装置
JPH11210478A (ja) * 1998-01-30 1999-08-03 Yamaha Motor Co Ltd エンジンの吸気装置
JP2005248727A (ja) * 2004-03-01 2005-09-15 Toyota Motor Corp 内燃機関の吸気装置
WO2018158698A1 (fr) * 2017-03-02 2018-09-07 Tvs Motor Company Limited Système d'induction d'air destiné à un véhicule à deux roues

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08128327A (ja) * 1994-11-04 1996-05-21 Isuzu Motors Ltd 内燃機関の低負荷時スワール発生装置
JPH11210478A (ja) * 1998-01-30 1999-08-03 Yamaha Motor Co Ltd エンジンの吸気装置
JP2005248727A (ja) * 2004-03-01 2005-09-15 Toyota Motor Corp 内燃機関の吸気装置
WO2018158698A1 (fr) * 2017-03-02 2018-09-07 Tvs Motor Company Limited Système d'induction d'air destiné à un véhicule à deux roues

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024202016A1 (fr) * 2023-03-31 2024-10-03 本田技研工業株式会社 Structure d'entrée d'air pour moteur à combustion interne

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BR112022016369A2 (pt) 2022-10-04
JP7241236B2 (ja) 2023-03-16

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