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WO2018180385A1 - Moteur à combustion interne - Google Patents

Moteur à combustion interne Download PDF

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Publication number
WO2018180385A1
WO2018180385A1 PCT/JP2018/009334 JP2018009334W WO2018180385A1 WO 2018180385 A1 WO2018180385 A1 WO 2018180385A1 JP 2018009334 W JP2018009334 W JP 2018009334W WO 2018180385 A1 WO2018180385 A1 WO 2018180385A1
Authority
WO
WIPO (PCT)
Prior art keywords
cylinder
pressure sensor
piston
internal combustion
combustion engine
Prior art date
Application number
PCT/JP2018/009334
Other languages
English (en)
Japanese (ja)
Inventor
裕樹 永田
秀智 若狭
哲也 中安
五十嵐　和則
博行 夏井
大介 北村
Original Assignee
本田技研工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 本田技研工業株式会社 filed Critical 本田技研工業株式会社
Priority to CN201880015147.4A priority Critical patent/CN110352298B/zh
Priority to JP2019509165A priority patent/JP6705057B2/ja
Publication of WO2018180385A1 publication Critical patent/WO2018180385A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/18—Other cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 

Definitions

  • the present invention relates to an internal combustion engine.
  • Patent Document 1 a technique is known in which a pressure sensor that detects a pressure in a cylinder part is exposed in the cylinder part (see, for example, Patent Document 1).
  • the main body of a pressure sensor is arrange
  • an intake valve an exhaust valve, and a spark plug
  • a plurality of intake valves and exhaust valves are provided, it is difficult to dispose the pressure sensor.
  • the present invention has been made in view of the above-described circumstances, and an object of the present invention is to enable an efficient arrangement of a pressure sensor that detects a pressure in a cylinder portion in an internal combustion engine.
  • the present invention relates to an internal combustion engine having a pressure sensor (40) for detecting a pressure inside a cylinder part (13), and an outer peripheral part (50a) of a piston (16) reciprocating inside the cylinder part (13). Further, a concave portion (55) that is recessed radially inward is provided, and the pressure sensor (40) has a detection portion (40b) exposed in the concave portion (55). In the above invention, the pressure sensor (40) may be exposed in the recess (55) when the piston (16) is located at a top dead center.
  • the cylinder part (13) includes a cylinder head (18) in which a combustion chamber (31) is provided, and a cylinder block (17) in which the piston (16) is accommodated, and the pressure sensor (40) may be provided in the vicinity of the combustion chamber (31) in the cylinder block (17).
  • the pressure sensor (40) includes the combustion chamber (31) more than the piston ring (53a) attached to the piston (16) in a state where the piston (16) is located at the top dead center.
  • the structure located in the side) may be sufficient.
  • the recess (55) may be configured to communicate with the combustion chamber (31) in a state where the piston (16) is located at a top dead center.
  • the cylinder block (17) includes a sensor support hole (45) penetrating the cylinder block (17) in the radial direction of the cylinder bore (28), and the pressure sensor (40) It may be inserted into the support hole (45).
  • the internal combustion engine is a multi-cylinder internal combustion engine in which a plurality of cylinders (25) are arranged along the axial direction of the crankshaft (11), and the sensor support hole (45) You may extend in the direction orthogonal to the arrangement direction of a cylinder (25).
  • the cylinder block (17) includes a water jacket (43) provided between a cylinder bore (28) in which the piston (16) is accommodated and an outer wall (42) of the cylinder block (17).
  • the internal combustion engine includes a pressure sensor that detects the pressure inside the cylinder portion, and a concave portion that is recessed radially inward is provided on the outer peripheral portion of the piston that reciprocates inside the cylinder portion.
  • the pressure sensor has its detection part exposed in the recess.
  • the pressure in the recessed part of the outer peripheral part of a piston can be detected as a pressure in a cylinder part by a pressure sensor, and the freedom degree of arrangement
  • the pressure sensor may be exposed in the recess when the piston is located at the top dead center. According to this configuration, the pressure in the cylinder portion with the piston positioned at the top dead center can be detected by the pressure sensor via the recess.
  • the cylinder portion may include a cylinder head in which the combustion chamber is provided and a cylinder block in which the piston is accommodated, and the pressure sensor may be provided in the vicinity of the combustion chamber in the cylinder block.
  • the pressure sensor may be located closer to the combustion chamber than the piston ring attached to the piston in a state where the piston is located at the top dead center. According to this configuration, since the piston ring is unlikely to interfere with pressure detection, the pressure in the combustion chamber can be detected by the pressure sensor.
  • the recess may communicate with the combustion chamber in a state where the piston is located at the top dead center. According to this configuration, the pressure in the combustion chamber can be detected by the pressure sensor through the recess.
  • the cylinder block may include a sensor support hole that penetrates the cylinder block in the radial direction of the cylinder bore, and the pressure sensor may be inserted into the sensor support hole. According to this configuration, the pressure sensor can be efficiently provided in the sensor support hole using the space in the radial direction of the cylinder block.
  • the internal combustion engine is a multi-cylinder internal combustion engine in which a plurality of cylinders are arranged along the axial direction of the crankshaft, and the sensor support hole extends in a direction perpendicular to the arrangement direction of the cylinders. It may be a configuration. According to this configuration, the other adjacent cylinders are unlikely to obstruct the arrangement of the pressure sensor, and therefore the pressure sensor can be arranged efficiently.
  • the cylinder block connects the cylinder bore and the outer wall portion in the radial direction of the cylinder bore at the upper end portion of the water jacket provided between the cylinder bore in which the piston is accommodated and the outer wall portion of the cylinder block.
  • the pressure sensor may be inserted in the bridge part. According to this configuration, the bridge portion can improve the rigidity of the cylinder block, and a pressure sensor can be provided in the vicinity of the combustion chamber using the bridge portion.
  • FIG. 1 is a cross-sectional view of an engine according to an embodiment of the present invention as viewed in the axial direction of a crankshaft.
  • FIG. 2 is a cross-sectional view of the engine as viewed from the rear side.
  • FIG. 5 is an enlarged cross-sectional view of the periphery of the pressure sensor of FIG.
  • FIG. 1 is a cross-sectional view of an engine 10 according to an embodiment of the present invention as viewed in the axial direction of a crankshaft 11.
  • FIG. 2 is a cross-sectional view of the engine 10 as viewed from the rear side.
  • the engine 10 (internal combustion engine) is mounted on a saddle-ride type vehicle such as a motorcycle.
  • the engine 10 is a multi-cylinder four-cycle engine in which a plurality of cylinders 25 are arranged in series.
  • the engine 10 is a water-cooled in-line four-cylinder engine.
  • the engine 10 is disposed between a front wheel and a rear wheel of a motorcycle (not shown) and is supported by a body frame.
  • the engine 10 includes a crankcase 12 that houses a crankshaft 11 that extends in the vehicle width direction (left-right direction), and a cylinder portion 13 that is coupled to the crankcase 12.
  • the cylinder part 13 extends from the upper part of the front part of the crankcase 12 to the front upper side of the motorcycle.
  • the cylinder axis 13a of the cylinder part 13 is inclined forward with respect to the vertical direction.
  • a transmission (not shown) that decelerates the driving force of the engine 10 and transmits it to the rear wheel side is built in the rear portion of the crankcase 12.
  • An oil pan 15 is attached to the lower part of the crankcase 12.
  • the crankcase 12 is formed by joining a lower case 12a and an upper case 12b, which are divided into two vertically.
  • the oil pan 15 is attached to the lower surface of the lower case 12a.
  • the cylinder portion 13 includes a cylinder block portion 17 (cylinder block) in which the piston 16 is accommodated, a cylinder head 18 coupled to the upper surface of the cylinder block portion 17, and a cylinder head cover 19 attached to the upper surface of the cylinder head 18. .
  • the cylinder block portion 17 is integrally formed on the upper portion of the upper case 12b of the crankcase 12.
  • an intake camshaft 21 and an exhaust camshaft 22 arranged in parallel with the crankshaft 11 are accommodated.
  • the intake camshaft 21 and the exhaust camshaft 22 are supported on the upper surface portion of the cylinder head 18 and rotate in conjunction with the crankshaft 11.
  • the cylinder portion 13 includes four cylinders 25 arranged along the axis 11 a of the crankshaft 11, and a piston 16 is provided in each cylinder 25.
  • Each cylinder 25 is configured similarly.
  • an intake device 23 is attached to the rear surface portion of the cylinder head 18, and an exhaust pipe 24 is attached to the front surface portion of the cylinder head 18.
  • the piston 16 is connected to the crankshaft 11 via a connecting rod 26.
  • the piston 16 is connected to the tip of the connecting rod 26 via a piston pin 26 a provided in parallel with the crankshaft 11.
  • the crankshaft 11 is rotatably supported by a plurality of support walls 27 a provided in the crank chamber 27 of the crankcase 12.
  • Each cylinder 25 includes a cylinder bore 28 that is formed in the cylinder block portion 17 and accommodates the piston 16, a valve operating device 29 provided in the cylinder head 18, and an ignition plug 30 attached to the cylinder head 18.
  • An axis of the cylinder bore 28 formed in a cylindrical shape is a cylinder axis 13 a of the cylinder portion 13.
  • the crankshaft 11 side may be referred to as the downward direction of the cylinder portion 13
  • the cylinder head cover 19 side may be referred to as the upward direction of the cylinder portion 13.
  • the cylinder head 18 includes a combustion recess 18 a that faces the top surface 16 a of the piston 16.
  • the combustion recess 18 a is a recess in which the lower surface of the cylinder head 18 is recessed toward the cylinder head cover 19, and closes the upper surface opening of the cylinder bore 28.
  • the combustion chamber 31 is formed between the top surface 16a and the combustion recess 18a.
  • the cylinder head 18 includes an intake port 32 that allows the intake device 23 to communicate with the combustion chamber 31 via an opening 32a at the lower end, and an exhaust port 33 that allows the combustion chamber 31 to communicate with the exhaust pipe 24 via an opening 33a at the lower end. Is provided. Fuel is injected into the intake port 32 by a fuel supply device 34.
  • the valve gear 29 includes the intake camshaft 21 and the exhaust camshaft 22, the intake valve 35 that opens and closes the opening 32a of the intake port 32, the exhaust valve 36 that opens and closes the opening 33a of the exhaust port 33, and the intake valve. And a valve spring 36a for urging the exhaust valve 36 in the valve closing direction.
  • a pair of intake valves 35 are provided side by side in the axial direction of the crankshaft 11 for each cylinder 25.
  • a pair of exhaust valves 36 is provided for each cylinder 25 side by side in the axial direction of the crankshaft 11. That is, four valves 35 and 36 are arranged in one cylinder 25.
  • the intake valve 35 is driven by being pressed by an intake cam 21a provided on the intake camshaft 21, and opens the opening 32a at a predetermined timing.
  • the exhaust valve 36 is driven by being pressed by an exhaust cam 22a provided on the exhaust camshaft 22, and opens the opening 33a at a predetermined timing.
  • the crankshaft 11 includes a drive sprocket 37 at the shaft end protruding outward from the crank chamber 27.
  • the driving force of the crankshaft 11 is transmitted to the valve operating device 29 by a driving force transmitting member 38 that connects the driving sprocket 37 to the intake camshaft 21 and the exhaust camshaft 22.
  • the engine 10 includes a power transmission member storage chamber 39 at a position adjacent to the side of the outermost cylinder in the arrangement of the plurality of cylinders 25.
  • the driving force transmission member 38 is stored in the power transmission member storage chamber 39.
  • the driving force transmission member 38 is, for example, a chain.
  • the piston 16 reciprocates in the cylinder bore 28 when the air-fuel mixture supplied from the intake port 32 to the combustion chamber 31 is ignited by the spark plug 30 and burned.
  • FIG. 1 the state where the piston 16 is located at the top dead center is indicated by a solid line, and the state where the piston 16 is located at the bottom dead center is indicated by a virtual line.
  • the engine 10 is provided with a pressure sensor 40 that detects the pressure in the cylinder portion 13.
  • FIG. 3 is a plan view of the cylinder block portion 17 as viewed from the cylinder head 18 side.
  • 4 is an enlarged cross-sectional view of the periphery of the pressure sensor 40 of FIG.
  • the cross section of FIG. 4 corresponds to the IV-IV cross section of FIG. 3 and 4
  • the pressure sensor 40 includes a columnar main body 40a, a detection unit 40b provided at the distal end thereof, and a wiring unit 40c drawn from the base end of the main body 40a.
  • the detector 40b is formed with a smaller diameter than the main body 40a.
  • the pressure sensor 40 is, for example, a piezoelectric sensor.
  • the pressure detected by the detection unit 40b is converted into an electrical signal by the circuit unit of the main body unit 40a, and is output to the engine 10 or the vehicle control unit via the wiring unit 40c.
  • the cylinder block portion 17 includes a plurality of cylinder bores 28 arranged along the axis 11 a of the crankshaft 11, an outer wall portion 42 provided so as to surround the plurality of cylinder bores 28 from the periphery, and the cylinder bore 28. And a water jacket 43 formed between the outer wall portion 42 and the outer wall portion 42.
  • a plurality of fixing holes 17 a into which bolts (not shown) for connecting the cylinder head 18 to the cylinder block portion 17 are inserted are formed in the upper surface portion of the outer wall portion 42 of the cylinder block portion 17.
  • a plurality of fixing holes 17 a are provided along the axis 11 a of the crankshaft 11 on the front side and the rear side of the cylinder bore 28.
  • the fixing holes 17a are provided in the front and rear of the outer surface portions of the outer cylinder bores 28 in the arrangement of the cylinder bores 28 and in front and rear of the joint portion between the cylinder bores 28 and 28 adjacent to each other.
  • the arrangement direction of the cylinder bores 28 is an extending direction of the axis 11 a of the crankshaft 11.
  • the front-rear direction of the cylinder bore 28 is a direction orthogonal to the axis 11a in the plan view of FIG.
  • the cooling water of the engine 10 flows through the water jacket 43.
  • the water jacket 43 is arrange
  • the water jacket 43 extends between the fixing holes 17 a and 17 a adjacent to each other in the axial direction of the crankshaft 11.
  • the cylinder block portion 17 includes a bridge portion 44 that connects the cylinder bore 28 and the outer wall portion 42 in the radial direction of the cylinder bore 28 at the upper end portion of the water jacket 43.
  • the bridge portions 44 are provided in the water jackets 43 before and after the cylinder bore 28, respectively.
  • the bridge portion 44 is provided on a surface (that is, a cross section of FIG. 4) that bisects the cylinder bores 28 in the arrangement direction of the cylinder bores 28.
  • the upper surface of the bridge portion 44 is flush with the upper surface of the cylinder block portion 17 serving as a coupling surface between the cylinder block portion 17 and the cylinder head 18.
  • the rigidity of the cylinder block portion 17 is improved by the bridge portion 44.
  • the bridge portion may be provided so as to penetrate the water jacket 43 at a position below the bridge portion 44.
  • FIG. 5 is an enlarged cross-sectional view of the periphery of the pressure sensor 40 of FIG. 3 to 5, the cylinder block portion 17 includes a sensor support hole 45 for supporting the pressure sensor 40 in the vicinity of the combustion chamber 31 at the upper portion thereof.
  • the sensor support hole 45 is a hole that penetrates the cylinder block portion 17 in the radial direction of the cylinder bore 28.
  • the sensor support hole 45 is disposed behind the cylinder bore 28 and is disposed in a direction perpendicular to the axis 11a of the crankshaft 11 and the cylinder axis 13a.
  • the sensor support hole 45 is a hole that penetrates the outer wall portion 42, the bridge portion 44, and the cylinder bore 28, and a part thereof is provided in the bridge portion 44.
  • the sensor support hole 45 includes a support hole 45 a that extends inward from the outer surface of the outer wall portion 42 toward the cylinder bore 28, and a detection hole 45 b that allows the support hole 45 a to communicate with the inside of the cylinder bore 28.
  • the detection portion 40b and the main body portion 40a of the pressure sensor 40 are inserted into and supported by the support hole portion 45a.
  • the detection hole 45b is formed to have a smaller diameter than the detection portion 40b of the pressure sensor 40.
  • the pressure sensor 40 is inserted into the support hole 45a from the rear outside of the cylinder block portion 17, and the outer peripheral portion of the front end surface of the detection unit 40b abuts against the stepped portion between the detection hole 45b and the support hole 45a. It is done.
  • the detection unit 40b is exposed to the inside of the cylinder bore 28 through the detection hole 45b.
  • the pressure sensor 40 is positioned in the sensor support hole 45 in a direction in which a sensor axis 40d, which is an axis thereof, is orthogonal to the axis 11a of the crankshaft 11 and the cylinder axis 13a, and is positioned behind the cylinder bore 28.
  • the sensor axis 40d passes through the centers of the detection unit 40b and the main body 40a.
  • the pressure sensor 40 is fixed to the sensor support hole 45 so that the inside of the cylinder bore 28 can be sealed.
  • the pressure sensor 40 is fixed to the sensor support hole 45 by, for example, a screw portion provided in the pressure sensor 40, but this fixing method is not particularly limited.
  • the piston 16 includes a disc-shaped piston head portion 50, a skirt portion 51 extending from a part of the outer peripheral portion 50a of the piston head portion 50 to the crankshaft 11 side, and a back surface side of the top surface 16a of the piston head portion 50. And a piston pin boss portion 52 provided integrally with each other. Plural piston rings 53a, 53b, and 53c are mounted in the groove of the outer peripheral portion 50a of the piston head portion 50 in order from the top surface 16a side.
  • the piston pin 26 a is inserted through the hole of the piston pin boss portion 52.
  • the skirt portion 51 extends downward from the front portion and the rear portion of the piston head portion 50. That is, the skirt portion 51 is formed in a portion of the piston 16 that is positioned in a direction orthogonal to the piston pin 26a.
  • the piston pin boss portion 52 extends to the skirt portion 51 side and is coupled to the back surface of the skirt portion 51.
  • a concave portion 55 is formed in the upper portion of the outer peripheral portion 50 a of the piston head portion 50 and is recessed inward in the radial direction of the piston 16.
  • the recess 55 continues to the top surface 16 a of the piston 16.
  • the bottom surface of the recess 55 is a flat surface parallel to the axis 11a of the crankshaft 11, and the recess 55 is formed, for example, by cutting one part of the outer peripheral portion 50a by machining.
  • the recessed part 55 is formed in the position between the piston ring 53a arrange
  • the depth of the recess 55 is smaller than the radial thickness t1 of the piston ring 53a.
  • the length of the recess 55 in the axial direction of the piston 16 is larger than the plate thickness t2 of the piston ring 53a.
  • the recess 55 is provided so as to be positioned on an extension line of the sensor axis 40d of the pressure sensor 40 in a state where the piston 16 is at the top dead center as shown in FIGS. For this reason, in a state where the piston 16 is at the top dead center position, the detection portion 40b of the pressure sensor 40 is exposed in the recess 55 through the detection hole 45b and faces the recess 55. When the piston 16 is at the top dead center position, a gap 56 is formed between the top surface 16 a of the piston 16 and the lower surface of the cylinder head 18, and the gap 56 communicates with the recess 55. Yes.
  • the detection unit 40b of the pressure sensor 40 has a structure communicating with the combustion chamber 31 through the detection hole 45b, the recess 55, and the gap 56, but the present invention is not limited to this. .
  • the detection portion 40b of the pressure sensor 40 is provided to face the concave portion 55 at the top dead center, and the detection portion 40b is directly positioned in the concave portion 55 and exposed in the concave portion 55. It is good also as a structure made to do.
  • the detection unit 40 b of the pressure sensor 40 communicates with the combustion chamber 31 via the detection hole 45 b, the recess 55, and the gap 56. Therefore, the pressure sensor 40 can detect the pressure in the combustion chamber 31 in a state where the piston 16 is at the top dead center position.
  • the detection unit 40 b of the pressure sensor 40 opens the detection hole 45 b. Through the cylinder bore 28. For this reason, the pressure inside the cylinder bore 28 can be detected by the pressure sensor 40.
  • the engine 10 is a four-valve internal combustion engine that includes a spark plug 30, a pair of intake valves 35, and a pair of exhaust valves 36 for each cylinder 25 of the cylinder head 18. For this reason, it is difficult to secure a space for arranging components in the cylinder head 18, but the pressure sensor 40 is provided in the sensor support hole 45 of the cylinder block portion 17, so that the space on the cylinder block portion 17 side is used.
  • the pressure sensor 40 can be arranged efficiently. As shown in FIG. 3, the pressure sensor 40 is disposed in the sensor support hole 45 in a direction in which the sensor axis 40 d is orthogonal to the axis 11 a of the crankshaft 11.
  • the adjacent cylinder bores 28 arranged along the axis 11a of the crankshaft 11 are unlikely to obstruct the arrangement of the pressure sensor 40, so that the pressure sensor 40 can be arranged efficiently.
  • the sensor axis 40d is arranged so as to be orthogonal to the axis 11a of the crankshaft 11, thereby storing the power transmission member.
  • the chamber 39 is unlikely to obstruct the arrangement of the pressure sensor 40. For this reason, the pressure sensor 40 can be provided efficiently.
  • the engine 10 includes the pressure sensor 40 that detects the pressure inside the cylinder portion 13, and the piston 16 that reciprocates inside the cylinder portion 13.
  • the outer peripheral portion 50 a is provided with a concave portion 55 that is recessed inward in the radial direction, and the pressure sensor 40 has its detection portion 40 b exposed in the concave portion 55.
  • the pressure in the recessed part 55 of the outer peripheral part 50a of the piston 16 can be detected by the pressure sensor 40 as the pressure in the cylinder part 13, and the freedom degree of arrangement
  • the cylinder portion 13 includes a cylinder head 18 in which the combustion chamber 31 is provided and a cylinder block portion 17 in which the piston 16 is accommodated, and the pressure sensor 40 is provided in the vicinity of the combustion chamber 31 in the cylinder block portion 17. .
  • the pressure sensor 40 provided in the cylinder block portion 17 can detect the pressure in the combustion chamber 31, and the pressure sensor 40 can be effectively arranged even when it is difficult to arrange the pressure sensor 40 on the cylinder head 18 side.
  • the pressure sensor 40 is located closer to the combustion chamber 31 than the piston ring 53a attached to the piston 16 in a state where the piston 16 is located at the top dead center. As a result, the piston ring 53a is unlikely to interfere with pressure detection, and the pressure in the combustion chamber 31 can be detected by the pressure sensor 40.
  • the cylinder block portion 17 includes a sensor support hole 45 that penetrates the cylinder block portion 17 in the radial direction of the cylinder bore 28, and the pressure sensor 40 is inserted into the sensor support hole 45. Thereby, the pressure sensor 40 can be efficiently provided in the sensor support hole 45 using the radial space of the cylinder block portion 17.
  • the engine 10 is a multi-cylinder internal combustion engine in which a plurality of cylinders 25 are arranged along the direction of the axis 11 a of the crankshaft 11, and the sensor support hole 45 is in a direction orthogonal to the arrangement direction of the cylinders 25. It extends.
  • the cylinder block portion 17 includes a water jacket 43 provided between the cylinder bore 28 in which the piston 16 is accommodated and the outer wall portion 42 of the cylinder block portion 17, and the cylinder bore 28 and the outer wall portion 42 at the upper end portion of the water jacket 43.
  • a bridge portion 44 that connects the cylinder bore 28 in the radial direction of the cylinder bore 28, and the pressure sensor 40 may be inserted into the bridge portion 44.
  • the bridge portion 44 can improve the rigidity of the cylinder block portion 17, and the pressure sensor 40 can be provided in the vicinity of the combustion chamber 31 using the bridge portion 44.
  • the said embodiment shows the one aspect
  • This invention is not limited to the said embodiment.
  • the pressure sensor 40 is assumed to be located in the sensor support hole 45 in the direction in which the sensor axis 40 d is orthogonal to the axis 11 a of the crankshaft 11 and the cylinder axis 13 a and is located behind the cylinder bore 28.
  • the present invention is not limited to this, and the pressure sensor 40 can be inserted radially inward of the cylinder bore 28 from an arbitrary position of the cylinder block portion 17.
  • the pressure sensor 40 is inserted from the front into the sensor support hole 45 in a direction in which the sensor axis 40d is orthogonal to the axis 11a of the crankshaft 11 and the cylinder axis 13a, as indicated by phantom lines in FIG. It may be located forward.
  • the pressure sensor 40 is exposed in a recess 55 provided on the front side of the piston 16.
  • the motorcycle has been described as an example.
  • the present invention is not limited to this, and the present invention is a three-wheel saddle-ride type vehicle having two front wheels or rear wheels.
  • the present invention can be applied to a saddle type vehicle having four or more wheels and a saddle type vehicle such as a scooter.
  • a four-cylinder internal combustion engine has been described as an example.
  • the present invention can be applied to a single cylinder, two cylinders, etc., and the number of cylinders is not limited.

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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)
  • Measuring Fluid Pressure (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

L'invention concerne un moteur à combustion interne conçu de façon à permettre l'installation efficace d'un capteur de pression servant à détecter la pression dans un cylindre. Ce moteur à combustion interne est pourvu d'un capteur de pression (40) servant à détecter la pression dans un cylindre (13). La périphérie externe (50a) d'un piston (16) animé d'un mouvement alternatif dans le cylindre (13) est pourvue d'un évidement (55) évidé radialement vers l'intérieur, et la section de détection (40b) du capteur de pression (40) est rendue visible à l'intérieur de l'évidement (55).
PCT/JP2018/009334 2017-03-27 2018-03-09 Moteur à combustion interne WO2018180385A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201880015147.4A CN110352298B (zh) 2017-03-27 2018-03-09 内燃机
JP2019509165A JP6705057B2 (ja) 2017-03-27 2018-03-09 内燃機関

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-061767 2017-03-27
JP2017061767 2017-03-27

Publications (1)

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WO2018180385A1 true WO2018180385A1 (fr) 2018-10-04

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Application Number Title Priority Date Filing Date
PCT/JP2018/009334 WO2018180385A1 (fr) 2017-03-27 2018-03-09 Moteur à combustion interne

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JP (1) JP6705057B2 (fr)
CN (1) CN110352298B (fr)
WO (1) WO2018180385A1 (fr)

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