WO2023238178A1 - Internal combustion engine - Google Patents

Internal combustion engine Download PDF

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Publication number
WO2023238178A1
WO2023238178A1 PCT/JP2022/022739 JP2022022739W WO2023238178A1 WO 2023238178 A1 WO2023238178 A1 WO 2023238178A1 JP 2022022739 W JP2022022739 W JP 2022022739W WO 2023238178 A1 WO2023238178 A1 WO 2023238178A1
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WO
WIPO (PCT)
Prior art keywords
internal combustion
combustion engine
front cover
guide rib
main body
Prior art date
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PCT/JP2022/022739
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French (fr)
Japanese (ja)
Inventor
正 矢部
Original Assignee
日産自動車株式会社
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Application filed by 日産自動車株式会社 filed Critical 日産自動車株式会社
Priority to PCT/JP2022/022739 priority Critical patent/WO2023238178A1/en
Publication of WO2023238178A1 publication Critical patent/WO2023238178A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/10—Indicating devices; Other safety devices
    • F01M11/12—Indicating devices; Other safety devices concerning lubricant level
    • 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
    • F02F7/00—Casings, e.g. crankcases or frames

Definitions

  • the present invention relates to an internal combustion engine.
  • Patent Document 1 discloses a case member that is attached to one side of an engine body and has a protrusion that forms a gauge passage. The oil level gauge is inserted into the gauge passage.
  • Patent Document 2 discloses a chain case of an internal combustion engine in which a rib-shaped band guide forming an oil level gauge passage is formed.
  • the internal combustion engine of the present invention has a front cover made of resin, the inner surface of which faces the end face of the internal combustion engine main body on one end side in the cylinder row direction, and covers the end face of the internal combustion engine main body on the one end side in the cylinder row direction.
  • the front cover has a gauge insertion port into which an oil level gauge is inserted, and a protruding guide rib that guides the oil level gauge inserted from the gauge insertion port.
  • the guide rib is formed on the inner surface of the front cover.
  • An oil level gauge passage through which the oil level gauge passes is formed by the inner surface of the front cover, the guide rib, and the end face of the internal combustion engine main body on one end side in the cylinder row direction.
  • the guide rib contributes to improving the rigidity of the front cover while forming a part of the oil level gauge passage.
  • the guide ribs improve the rigidity of the front cover, so that membrane vibration of the front cover can be suppressed.
  • FIG. 1 is an explanatory diagram schematically showing a schematic configuration of an internal combustion engine to which the present invention is applied.
  • FIG. 1 is an explanatory diagram schematically showing one end side in a cylinder row direction of an internal combustion engine to which the present invention is applied.
  • Front view of the front cover. Rear view of the front cover.
  • the X axis is an axis along the longitudinal direction of the internal combustion engine 1 (an axis parallel to the central axis of the crankshaft of the internal combustion engine 1)
  • the Y axis is the horizontal direction of the internal combustion engine 1 (internal combustion engine width direction).
  • the axis along the axis A and the Z axis respectively indicate an axis along the vertical direction of the internal combustion engine 1 (an axis parallel to the cylinder axis A of the internal combustion engine 1). That is, the X-axis is an axis along the cylinder row direction of the internal combustion engine 1 or the internal combustion engine main body 8 (described later). Further, the Y-axis is an axis along the width direction of the internal combustion engine main body 8.
  • FIG. 1 is an explanatory diagram schematically showing a schematic configuration of an internal combustion engine 1 to which the present invention is applied.
  • the internal combustion engine 1 is, for example, an in-line multi-cylinder internal combustion engine, and includes a cylinder head 2, a cylinder block 3 attached to the lower part of the cylinder head 2, a cam bracket 4 attached to the upper part of the cylinder head 2, and cylinders.
  • the engine has an upper oil pan 5 attached to the lower part of the block 3, an oil pan lower 6 attached to the lower part of the upper oil pan 5, and a front cover 7 that covers the front surface of the internal combustion engine main body 8.
  • the cylinder head 2, cylinder block 3, cam bracket 4, and oil pan upper 5 constitute an internal combustion engine main body 8.
  • the inner surface 7a of the front cover 7 faces the end surface 8a of the internal combustion engine main body 8 at one end in the cylinder row direction, and the inner surface 7a covers the end surface 8a.
  • the outer surface 7b of the front cover 7 faces outward.
  • the front cover 7 has a vertical wall 7c that is continuous along the entire outer periphery. The vertical wall 7c is formed to extend in the direction along the X-axis.
  • the cylinder head 2 is a cast product made of a metal material such as an aluminum alloy, and has an intake port (not shown) that supplies intake air to a combustion chamber (not shown) and exhaust air from the combustion chamber (not shown).
  • An exhaust port (not shown) is formed for exhaust.
  • the cylinder block 3 is a cast product made of a metal material such as an aluminum alloy, and is formed with a number of cylinders (not shown) corresponding to the number of cylinders.
  • the cam bracket 4 is made of a metal material such as aluminum alloy, and supports the camshaft 10 (see FIG. 2) rotatably together with the cylinder head 2.
  • the oil pan upper 5 is made of a metal material such as an aluminum alloy, and together with the cylinder block 3 constitutes a crankcase (not shown) in which a crankshaft (not shown) is housed.
  • the oil pan lower 6 is made of a synthetic resin material such as polyamide, and stores lubricating oil.
  • the front cover 7 is made of a synthetic resin material such as polyamide, and is attached to the internal combustion engine main body 8 in a liquid-tight manner so as to cover the front surface of the internal combustion engine main body 8. More specifically, the front cover 7 is attached to the front surface of the cylinder block 3, the front surface of the cylinder head 2, the front surface of the cam bracket 4, and the front surface of the oil pan upper 5 by bolts (not shown). In other words, the front cover 7 is attached to the internal combustion engine main body 8 so as to cover one end surface of the cylinder block 3 and the cylinder head 2 in the crankshaft axial direction, that is, one end surface 8a of the internal combustion engine main body 8 in the cylinder row direction. It is attached.
  • a synthetic resin material such as polyamide
  • the front cover 7 has a shallow dish shape, and is connected to the front surface of the internal combustion engine main body 8, which is an end surface 8a on one end side of the internal combustion engine main body 8 in the cylinder row direction.
  • a space 9 communicating with the oil storage space is formed.
  • FIG. 2 is an explanatory diagram schematically showing one end side of the internal combustion engine 1 in the cylinder row direction in a plan view.
  • the space 9 accommodates a cam sprocket 11 fixed to the front end of the camshaft 10 and a crank sprocket 12 fixed to the crankshaft (see FIG. 3).
  • a timing chain (not shown) for transmitting rotational power is wound around the cam sprocket 11 and crank sprocket 12.
  • An intake cam sprocket 11a and a variable phase mechanism (variable valve mechanism) 13 are attached to the front end of the intake camshaft 10a.
  • the phase variable mechanism 13 changes the valve timing of the intake valve by changing the phase of the lift center angle of the intake valve.
  • An exhaust cam sprocket 11b is attached to the front end of the exhaust camshaft 10b.
  • FIGS. 3 to 5 the front cover 7 is continuous with the crankshaft through hole 14, the first bolt through hole 15, the second bolt through hole 16, the through holes 17 and 18, and the space 9. It has a gauge insertion port 19 formed as follows.
  • FIG. 3 is a front view of the front cover 7.
  • FIG. 4 is a rear view of the front cover 7.
  • FIG. 5 is a perspective view of the front cover 7.
  • the crankshaft through hole 14 is a hole through which a crankshaft (not shown) passes.
  • the periphery of the crankshaft through hole 14 is a flat crank pulley facing portion 21 sandwiched between the crank sprocket 12 and a crank pulley 20 fixed to the front end of the crankshaft.
  • a plurality of protruding ribs 22 are formed on the outer periphery of the outer surface of the crank pulley facing portion 21 so as to intersect with guide ribs 31, which will be described later.
  • a plurality of ribs 22 are formed on the outer surface 7b of the front cover 7 so as to be vertically aligned along an oil level gauge passage 32, which will be described later.
  • the first bolt through holes 15 are through which bolts (not shown) that fix the front cover 7 to the internal combustion engine main body 8 pass, and a plurality of first bolt through holes 15 are formed on the outer peripheral edge of the front cover 7.
  • a plurality of second bolt through holes 16 are formed in the front cover 7 (at five locations) through which bolts (not shown) that fix parts other than the outer peripheral edge of the front cover 7 to the internal combustion engine main body 8 pass. ing.
  • the through holes 17 and 18 are holes through which a part of a mount bracket (not shown) for fixing the internal combustion engine 1 to the vehicle body passes.
  • the gauge insertion port 19 is a hole formed through the upper part of the front cover 7.
  • the front cover 7 has a protruding guide rib 31 rising from the inner surface 7a.
  • the guide rib 31 guides (the tip side of) an oil level gauge (not shown) inserted from the gauge insertion port 19 to an oil reservoir (oil reservoir) at the lower part of the internal combustion engine 1 .
  • the guide rib 31 includes an oil level gauge passage 32 (indicated by the thick broken line in FIG. 4), which is a tunnel-shaped passage through which the oil level gauge passes, together with the inner surface 7a of the front cover 7 and the end face 8a of the internal combustion engine main body 8 on one end side in the cylinder row direction. ) is formed in space 9.
  • the guide ribs 31 include a first guide rib row 33 extending in the vertical direction of the front cover 7 (direction along the Z axis), and a first guide rib row 33 extending in the width direction of the front cover 7 (direction along the Y axis). It consists of second guide rib rows 34 facing each other at a predetermined distance apart.
  • the first guide rib row 33 and the second guide rib row 34 face each other with an interval such that an oil level gauge can be inserted therein.
  • the second guide rib row 34 is located closer to the inner circumference of the front cover 7 than the first guide rib row 33 when viewed in the X-axis direction as shown in FIG. 3 or 4 .
  • the first guide rib row 33 has a plurality of first ribs 35 arranged in series along the vertical direction of the front cover 7 (direction along the Z axis).
  • the front cover 7 has first guide rib rows 33, which are arranged in order from above in the vertical direction of the front cover 7, such as a first rib 35a, a first rib 35b, a first rib 35c, a first rib 35d, a first rib 35e, and a first rib 35a.
  • 1 rib 35f is formed.
  • These first ribs 35 are formed along the outer peripheral edge of the front cover 7 so as to be spaced apart from each other in the vertical direction of the front cover 7 (direction along the Z axis).
  • the second guide rib row 34 has a plurality of second ribs 36 arranged in series along the vertical direction of the front cover 7 (direction along the Z axis).
  • a second rib 36a, a second rib 36b, a second rib 36c, a second rib 36d, and a second rib 36e are formed as a second guide rib row 34 in order from above in the vertical direction of the front cover 7. has been done.
  • the plurality of second ribs 36 are spaced apart from each other along the vertical direction of the front cover 7 (direction along the Z-axis).
  • a portion of the guide rib 31 is connected to a bolt boss portion 37 in which the first bolt through hole 15 is formed.
  • the lower end of the first rib 35e and the upper end of the first rib 35f are connected to the bolt boss portion 37a.
  • the lower end of the first rib 35f and the lower end of the second rib 36e are connected to the bolt boss portion 37b.
  • the bolt boss portion 37a is located below the front cover 7.
  • the bolt boss portion 37b is located at the lower end of the front cover 7.
  • the guide rib 31 is formed on the outer peripheral edge of the crank pulley facing portion 21. In other words, the guide rib 31 is formed at a position adjacent to the outer peripheral edge of the crank sprocket 12.
  • the front cover 7 has a lower part of the first rib 35d, a first rib 35e, an upper part of the first rib 35f, a lower part of the second rib 36c, and an upper part of the second rib 36d and the second rib 36e facing the crank pulley. It is formed so as to be located at the outer peripheral edge of the portion 21.
  • the guide rib 31 is formed at a position adjacent to the outer peripheral edge of the intake cam sprocket 11a.
  • the guide rib 31 is formed on the outer peripheral edge of the cam sprocket facing portion 41 of the front cover 7 .
  • the cam sprocket opposing portion 41 is a flat portion of the front cover 7 that covers the intake cam sprocket 11a.
  • the upper ends of the first rib 35a and the first rib 35b, and the upper ends of the second rib 36a and the second rib 36b are formed at positions adjacent to the outer peripheral edge of the intake cam sprocket 11a.
  • a tunnel-shaped oil level gauge passage 32 is formed by the inner surface 7a of the front cover 7, the guide rib 31, and the end surface 8a of the internal combustion engine main body 8 on one end side in the cylinder row direction. There is.
  • the guide rib 31 contributes to improving the rigidity of the front cover 7 while forming a part of the tunnel-shaped oil level gauge passage 32.
  • the guide rib 31 is formed along the outer peripheral edge of the front cover 7. This allows the guide rib 31 to face the outer peripheral edge of the front cover 7. Specifically, a portion of the second guide rib row 34 that does not face the first guide rib row 33 can be made to face the vertical wall 7c of the outer peripheral edge of the front cover 7. The distance between the first rib 35d and the first rib 35e in the vertical direction is increased, but during this time, the outer peripheral edge of the front cover 7 is replaced by the first guide rib row 33 as a tunnel-shaped oil level gauge passage 32. It forms part of the wall. That is, the oil level gauge passage 32 is formed between the guide rib 31 and the vertical wall 7c on the outer peripheral edge of the front cover 7.
  • the oil level gauge passage 32 can be constructed using the vertical wall 7c on the outer periphery that was originally formed on the front cover 7.
  • the internal combustion engine 1 can configure the tunnel-shaped oil level gauge passage 32 while suppressing increases in materials and weight.
  • the outer peripheral edge (outer edge) of the front cover 7, which is relatively susceptible to external force, can be reinforced by using the guide ribs 31 forming the oil level gauge passage 32.
  • crank pulley facing portion 21 of the front cover 7 is formed into a flat plate shape, which makes it difficult to increase the rigidity due to its structure.
  • the rigidity of the crank pulley facing part 21 around the crankshaft through hole 14 is reduced by providing the guide rib 31 adjacent to the outer peripheral edge of the crank pulley facing part 21 of the front cover 7. It is possible to improve this and suppress membrane vibration.
  • crank pulley facing portion 21 since the plurality of ribs 22 are formed on the outer surface of the crank pulley facing portion 21, the rigidity of the vicinity of the crankshaft through hole 14 of the front cover 7 (crank pulley facing portion 21) can be improved. .
  • the cam sprocket facing portion 41 of the front cover 7 is formed into a flat plate shape, and structurally, it is difficult to increase the rigidity.
  • the guide rib 31 is connected to the bolt boss portion 37. Therefore, in the internal combustion engine 1, the rigidity of the front cover 7 can be improved by making the guide ribs 31 and the bolt boss portions 37 work together.
  • first ribs 35 in the first guide rib row 33 is not limited to six, and may be other than six.
  • the number of second ribs 36 in the second guide rib row 34 is not limited to five, and may be other than five.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

In the present invention, a front cover (7) has, on an inner surface (7a) thereof, a guide rib (31) which forms a ridge. The guide rib (31) guides an oil level gauge inserted through a gauge insertion port (19). The guide rib (31) constitutes, together with the inner surface (7a) of the front cover (7) and the end surface on one end side in the direction of a cylindrical column of an internal combustion engine body (8), an oil level gauge passage (32), which is a tunnel-like passage through which an oil level gauge passes. The guide rib (31) improves the rigidity of the front cover (7), thereby suppressing front cover (7) film vibration.

Description

内燃機関internal combustion engine
　本発明は、内燃機関に関する。 The present invention relates to an internal combustion engine.
　例えば、特許文献１には、エンジン本体の一側面に取り付けられたケース部材に、ゲージ通路を構成する突条部が形成されたものが開示されている。ゲージ通路は、オイルレベルゲージが挿入されるものである。 For example, Patent Document 1 discloses a case member that is attached to one side of an engine body and has a protrusion that forms a gauge passage. The oil level gauge is inserted into the gauge passage.
　また、特許文献２には、内燃機関のチェーンケースに、オイルレベルゲージ用通路を構成するリブ状の帯状ガイドが形成されたものが開示されている。 Further, Patent Document 2 discloses a chain case of an internal combustion engine in which a rib-shaped band guide forming an oil level gauge passage is formed.
　しかしながら、これら特許文献１、２においては、ケース部材またはチェーンケースの剛性を向上させて膜振動を低減させることに関して特段の考慮がなされていない。つまり、上述したケース部材やチェーンケース等のカバー部材を有する内燃機関においては、これらのカバー部材の膜振動の低減を図るために更なる改善の余地がある。 However, in these Patent Documents 1 and 2, no special consideration is given to improving the rigidity of the case member or the chain case to reduce membrane vibration. In other words, in an internal combustion engine having a cover member such as the case member or chain case described above, there is room for further improvement in reducing the membrane vibration of these cover members.
特開２０１５－３４５２８号公報JP2015-34528A 特開２０１５－６３９０６号公報JP2015-63906A
　本発明の内燃機関は、内側面が内燃機関本体の気筒列方向の一端側の端面と対向し、上記内燃機関本体の気筒列方向の一端側の端面を覆う樹脂製のフロントカバーを有している。上記フロントカバーは、オイルレベルゲージが挿入されるゲージ差し込み口と、該ゲージ差し込み口から挿入された上記オイルレベルゲージを案内する突条のガイドリブと、を有している。上記ガイドリブは、上記フロントカバーの上記内側面に形成されている。上記フロントカバーの上記内側面と上記ガイドリブと上記内燃機関本体の気筒列方向の一端側の端面とによって、上記オイルレベルゲージが通るオイルレベルゲージ通路が形成されている。 The internal combustion engine of the present invention has a front cover made of resin, the inner surface of which faces the end face of the internal combustion engine main body on one end side in the cylinder row direction, and covers the end face of the internal combustion engine main body on the one end side in the cylinder row direction. There is. The front cover has a gauge insertion port into which an oil level gauge is inserted, and a protruding guide rib that guides the oil level gauge inserted from the gauge insertion port. The guide rib is formed on the inner surface of the front cover. An oil level gauge passage through which the oil level gauge passes is formed by the inner surface of the front cover, the guide rib, and the end face of the internal combustion engine main body on one end side in the cylinder row direction.
　本発明によれば、ガイドリブは、オイルレベルゲージ通路の一部を構成しつつ、フロントカバーの剛性向上に寄与している。内燃機関は、ガイドリブがフロントカバーの剛性が向上させるため、フロントカバーの膜振動を抑制できる。 According to the present invention, the guide rib contributes to improving the rigidity of the front cover while forming a part of the oil level gauge passage. In internal combustion engines, the guide ribs improve the rigidity of the front cover, so that membrane vibration of the front cover can be suppressed.
本発明が適用される内燃機関の概略構成を模式的に示した説明図。1 is an explanatory diagram schematically showing a schematic configuration of an internal combustion engine to which the present invention is applied. 本発明が適用される内燃機関の気筒列方向の一端側を模式的に示した説明図。FIG. 1 is an explanatory diagram schematically showing one end side in a cylinder row direction of an internal combustion engine to which the present invention is applied. フロントカバーの正面図。Front view of the front cover. フロントカバーの背面図。Rear view of the front cover. フロントカバーの斜視図。A perspective view of the front cover.
　以下、本発明の一実施例を図面に基づいて詳細に説明する。なお、各図中におけるＸ軸は内燃機関１の前後方向に沿った軸線（内燃機関１のクランクシャフトの中心軸線と平行な軸線）、Ｙ軸は内燃機関１の左右方向（内燃機関幅方向）に沿った軸線、Ｚ軸は内燃機関１の上下方向に沿った軸線（内燃機関１のシリンダ軸線Ａと平行な軸線）、をそれぞれ示している。つまりＸ軸は、内燃機関１あるいは内燃機関本体８（後述）の気筒列方向に沿った軸線である。また、Ｙ軸は、内燃機関本体８の幅方向に沿った軸線である。 Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. In each figure, the X axis is an axis along the longitudinal direction of the internal combustion engine 1 (an axis parallel to the central axis of the crankshaft of the internal combustion engine 1), and the Y axis is the horizontal direction of the internal combustion engine 1 (internal combustion engine width direction). The axis along the axis A and the Z axis respectively indicate an axis along the vertical direction of the internal combustion engine 1 (an axis parallel to the cylinder axis A of the internal combustion engine 1). That is, the X-axis is an axis along the cylinder row direction of the internal combustion engine 1 or the internal combustion engine main body 8 (described later). Further, the Y-axis is an axis along the width direction of the internal combustion engine main body 8.
　図１は、本発明が適用される内燃機関１の概略構成を模式的に示した説明図である。 FIG. 1 is an explanatory diagram schematically showing a schematic configuration of an internal combustion engine 1 to which the present invention is applied.
　内燃機関１は、例えば直列多気筒の内燃機関であって、シリンダヘッド２と、シリンダヘッド２の下部に取り付けられたシリンダブロック３と、シリンダヘッド２の上部に取り付けられたカムブラケット４と、シリンダブロック３の下部に取り付けられたオイルパンアッパ５と、オイルパンアッパ５の下部に取り付けられたオイルパンロア６と、内燃機関本体８の前面を覆うフロントカバー７と、を有している。なお、シリンダヘッド２、シリンダブロック３、カムブラケット４及びオイルパンアッパ５は、内燃機関本体８を構成するものである。従って、フロントカバー７は、その内側面７ａが内燃機関本体８の気筒列方向の一端側の端面８ａと対向し、かつ内側面７ａが端面８ａを覆っている。フロントカバー７の外側面７ｂは、外側に面している。また、フロントカバー７は、外周縁の全周に亘って連続する縦壁７ｃを有している。縦壁７ｃは、Ｘ軸に沿った方向に延びるように形成されている。 The internal combustion engine 1 is, for example, an in-line multi-cylinder internal combustion engine, and includes a cylinder head 2, a cylinder block 3 attached to the lower part of the cylinder head 2, a cam bracket 4 attached to the upper part of the cylinder head 2, and cylinders. The engine has an upper oil pan 5 attached to the lower part of the block 3, an oil pan lower 6 attached to the lower part of the upper oil pan 5, and a front cover 7 that covers the front surface of the internal combustion engine main body 8. Note that the cylinder head 2, cylinder block 3, cam bracket 4, and oil pan upper 5 constitute an internal combustion engine main body 8. Therefore, the inner surface 7a of the front cover 7 faces the end surface 8a of the internal combustion engine main body 8 at one end in the cylinder row direction, and the inner surface 7a covers the end surface 8a. The outer surface 7b of the front cover 7 faces outward. Further, the front cover 7 has a vertical wall 7c that is continuous along the entire outer periphery. The vertical wall 7c is formed to extend in the direction along the X-axis.
　シリンダヘッド２は、例えばアルミ合金等の金属材料からなる鋳造品であり、燃焼室（図示せず）に吸気を供給する吸気ポート（図示せず）や、燃焼室（図示せず）から排気を排出するための排気ポート（図示せず）が形成されている。 The cylinder head 2 is a cast product made of a metal material such as an aluminum alloy, and has an intake port (not shown) that supplies intake air to a combustion chamber (not shown) and exhaust air from the combustion chamber (not shown). An exhaust port (not shown) is formed for exhaust.
　シリンダブロック３は、例えばアルミ合金等の金属材料からなる鋳造品であり、気筒数に応じた数のシリンダ（図示せず）が形成されている。 The cylinder block 3 is a cast product made of a metal material such as an aluminum alloy, and is formed with a number of cylinders (not shown) corresponding to the number of cylinders.
　カムブラケット４は、例えばアルミ合金等の金属材料からなり、カムシャフト１０（図２を参照）をシリンダヘッド２とともに回転可能に支持するものである。 The cam bracket 4 is made of a metal material such as aluminum alloy, and supports the camshaft 10 (see FIG. 2) rotatably together with the cylinder head 2.
　オイルパンアッパ５は、例えばアルミ合金等の金属材料からなり、シリンダブロック３とともにクランクシャフト（図示せず）が収容されるクランクケース（図示せず）を構成する。 The oil pan upper 5 is made of a metal material such as an aluminum alloy, and together with the cylinder block 3 constitutes a crankcase (not shown) in which a crankshaft (not shown) is housed.
　オイルパンロア６は、例えばポリアミド等の合成樹脂材料からなり、潤滑用のオイルを貯留している。 The oil pan lower 6 is made of a synthetic resin material such as polyamide, and stores lubricating oil.
　フロントカバー７は、例えばポリアミド等の合成樹脂材料からなり、内燃機関本体８の前面を覆うように内燃機関本体８に液密に取り付けられている。詳述すると、フロントカバー７は、シリンダブロック３の前面、シリンダヘッド２の前面、カムブラケット４の前面及びオイルパンアッパ５の前面に、図示せぬボルトによって取り付けられている。換言すると、フロントカバー７は、クランクシャフト軸線方向におけるシリンダブロック３及びシリンダヘッド２の一端側の端面、つまり内燃機関本体８の気筒列方向の一端側の端面８ａを覆うように内燃機関本体８に取り付けられる。 The front cover 7 is made of a synthetic resin material such as polyamide, and is attached to the internal combustion engine main body 8 in a liquid-tight manner so as to cover the front surface of the internal combustion engine main body 8. More specifically, the front cover 7 is attached to the front surface of the cylinder block 3, the front surface of the cylinder head 2, the front surface of the cam bracket 4, and the front surface of the oil pan upper 5 by bolts (not shown). In other words, the front cover 7 is attached to the internal combustion engine main body 8 so as to cover one end surface of the cylinder block 3 and the cylinder head 2 in the crankshaft axial direction, that is, one end surface 8a of the internal combustion engine main body 8 in the cylinder row direction. It is attached.
　図２に示すように、フロントカバー７は、浅皿形状を呈し、内燃機関本体８の気筒列方向の一端側の端面８ａである内燃機関本体８の前面との間にオイルパンアッパ５内のオイル貯留空間と連通する空間９を形成する。図２は、内燃機関１の気筒列方向の一端側を平面視して模式的に示した説明図である。空間９には、カムシャフト１０の前端に固定されたカムスプロケット１１や、クランクシャフトに固定されたクランクスプロケット１２（図３を参照）が収容される。これらカムスプロケット１１やクランクスプロケット１２には、回転動力伝達用のタイミングチェーン（図示せず）が巻き掛けられる。 As shown in FIG. 2, the front cover 7 has a shallow dish shape, and is connected to the front surface of the internal combustion engine main body 8, which is an end surface 8a on one end side of the internal combustion engine main body 8 in the cylinder row direction. A space 9 communicating with the oil storage space is formed. FIG. 2 is an explanatory diagram schematically showing one end side of the internal combustion engine 1 in the cylinder row direction in a plan view. The space 9 accommodates a cam sprocket 11 fixed to the front end of the camshaft 10 and a crank sprocket 12 fixed to the crankshaft (see FIG. 3). A timing chain (not shown) for transmitting rotational power is wound around the cam sprocket 11 and crank sprocket 12.
　吸気カムシャフト１０ａの前端には、吸気カムスプロケット１１ａと位相可変機構（可変動弁機構）１３が取り付けられている。位相可変機構１３は、吸気弁のリフト中心角の位相を変更して吸気弁のバルブタイミングを変更するものである。排気カムシャフト１０ｂの前端には、排気カムスプロケット１１ｂが取り付けられている。 An intake cam sprocket 11a and a variable phase mechanism (variable valve mechanism) 13 are attached to the front end of the intake camshaft 10a. The phase variable mechanism 13 changes the valve timing of the intake valve by changing the phase of the lift center angle of the intake valve. An exhaust cam sprocket 11b is attached to the front end of the exhaust camshaft 10b.
　図３～図５に示すように、フロントカバー７は、クランクシャフト貫通孔１４と、第１ボルト貫通孔１５と、第２ボルト貫通孔１６と、貫通孔１７、１８と、空間９と連続するように形成されたゲージ差し込み口１９と、を有している。図３は、フロントカバー７の正面図である。図４は、フロントカバー７の背面図である。図５は、フロントカバー７の斜視図である。 As shown in FIGS. 3 to 5, the front cover 7 is continuous with the crankshaft through hole 14, the first bolt through hole 15, the second bolt through hole 16, the through holes 17 and 18, and the space 9. It has a gauge insertion port 19 formed as follows. FIG. 3 is a front view of the front cover 7. FIG. 4 is a rear view of the front cover 7. FIG. 5 is a perspective view of the front cover 7.
　クランクシャフト貫通孔１４は、図示せぬクランクシャフトが貫通する孔である。クランクシャフト貫通孔１４の周囲は、クランクスプロケット１２及びクランクシャフトの前端に固定されたクランクプーリ２０に挟まれた平板状のクランクプーリ対向部２１となっている。このクランクプーリ対向部２１の外側面の外周側には、後述するガイドリブ３１と交差するように、複数の突状のリブ２２が形成されている。換言すると、フロントカバー７の外側面７ｂには、複数のリブ２２が後述するオイルレベルゲージ通路３２に沿って上下方向に並んで形成されている。 The crankshaft through hole 14 is a hole through which a crankshaft (not shown) passes. The periphery of the crankshaft through hole 14 is a flat crank pulley facing portion 21 sandwiched between the crank sprocket 12 and a crank pulley 20 fixed to the front end of the crankshaft. A plurality of protruding ribs 22 are formed on the outer periphery of the outer surface of the crank pulley facing portion 21 so as to intersect with guide ribs 31, which will be described later. In other words, a plurality of ribs 22 are formed on the outer surface 7b of the front cover 7 so as to be vertically aligned along an oil level gauge passage 32, which will be described later.
　第１ボルト貫通孔１５は、フロントカバー７を内燃機関本体８に固定するボルト（図示せず）が貫通するものであって、フロントカバー７の外周縁に複数（多数）形成されている。 The first bolt through holes 15 are through which bolts (not shown) that fix the front cover 7 to the internal combustion engine main body 8 pass, and a plurality of first bolt through holes 15 are formed on the outer peripheral edge of the front cover 7.
　第２ボルト貫通孔１６は、フロントカバー７の外周縁以外の部分を内燃機関本体８に固定するボルト（図示せず）が貫通するものであって、フロントカバー７に複数（５箇所）形成されている。 A plurality of second bolt through holes 16 are formed in the front cover 7 (at five locations) through which bolts (not shown) that fix parts other than the outer peripheral edge of the front cover 7 to the internal combustion engine main body 8 pass. ing.
　貫通孔１７、１８は、内燃機関１を車体に固定するためのマウントブラケット（図示せず）の一部が貫通する孔である。 The through holes 17 and 18 are holes through which a part of a mount bracket (not shown) for fixing the internal combustion engine 1 to the vehicle body passes.
　ゲージ差し込み口１９は、フロントカバー７の上部に貫通形成された孔である。 The gauge insertion port 19 is a hole formed through the upper part of the front cover 7.
　また、フロントカバー７は、図４に示すように、内側面７ａから立ち上がる突条のガイドリブ３１を有している。ガイドリブ３１は、ゲージ差し込み口１９から挿入された図示せぬオイルレベルゲージ（の先端側）を内燃機関１下部のオイル溜まり（オイル貯留部）へ案内する。ガイドリブ３１は、フロントカバー７の内側面７ａと内燃機関本体８の気筒列方向の一端側の端面８ａとともにオイルレベルゲージが通るトンネル状の通路であるオイルレベルゲージ通路３２（図４中の太破線）を空間９に形成する。 Further, as shown in FIG. 4, the front cover 7 has a protruding guide rib 31 rising from the inner surface 7a. The guide rib 31 guides (the tip side of) an oil level gauge (not shown) inserted from the gauge insertion port 19 to an oil reservoir (oil reservoir) at the lower part of the internal combustion engine 1 . The guide rib 31 includes an oil level gauge passage 32 (indicated by the thick broken line in FIG. 4), which is a tunnel-shaped passage through which the oil level gauge passes, together with the inner surface 7a of the front cover 7 and the end face 8a of the internal combustion engine main body 8 on one end side in the cylinder row direction. ) is formed in space 9.
　ガイドリブ３１は、フロントカバー７の上下方向（Ｚ軸に沿った方向）に沿って延びる第１ガイドリブ列３３と、第１ガイドリブ列３３とフロントカバー７の幅方向（Ｙ軸に沿った方向）で所定距離離間して対向する第２ガイドリブ列３４と、からなる。第１ガイドリブ列３３と第２ガイドリブ列３４は、オイルレベルゲージが挿入可能となるような間隔をあけて対向している。第２ガイドリブ列３４は、図３または図４に示すようなＸ軸方向視において、第１ガイドリブ列３３よりもフロントカバー７の内周側に位置している。 The guide ribs 31 include a first guide rib row 33 extending in the vertical direction of the front cover 7 (direction along the Z axis), and a first guide rib row 33 extending in the width direction of the front cover 7 (direction along the Y axis). It consists of second guide rib rows 34 facing each other at a predetermined distance apart. The first guide rib row 33 and the second guide rib row 34 face each other with an interval such that an oil level gauge can be inserted therein. The second guide rib row 34 is located closer to the inner circumference of the front cover 7 than the first guide rib row 33 when viewed in the X-axis direction as shown in FIG. 3 or 4 .
　第１ガイドリブ列３３は、フロントカバー７の上下方向（Ｚ軸に沿った方向）に沿って直列に並んだ複数の第１リブ３５を有している。フロントカバー７には、第１ガイドリブ列３３として、フロントカバー７の上下方向の上方から順に、第１リブ３５ａ、第１リブ３５ｂ、第１リブ３５ｃ、第１リブ３５ｄ、第１リブ３５ｅ、第１リブ３５ｆが形成されている。これら複数の第１リブ３５は、フロントカバー７の外周縁に沿って、フロントカバー７の上下方向（Ｚ軸に沿った方向）に互いに間隔を空けて離間するよう形成されている。 The first guide rib row 33 has a plurality of first ribs 35 arranged in series along the vertical direction of the front cover 7 (direction along the Z axis). The front cover 7 has first guide rib rows 33, which are arranged in order from above in the vertical direction of the front cover 7, such as a first rib 35a, a first rib 35b, a first rib 35c, a first rib 35d, a first rib 35e, and a first rib 35a. 1 rib 35f is formed. These first ribs 35 are formed along the outer peripheral edge of the front cover 7 so as to be spaced apart from each other in the vertical direction of the front cover 7 (direction along the Z axis).
　第２ガイドリブ列３４は、フロントカバー７の上下方向（Ｚ軸に沿った方向）に沿って直列に並んだ複数の第２リブ３６を有している。フロントカバー７には、第２ガイドリブ列３４として、フロントカバー７の上下方向の上方から順に、第２リブ３６ａ、第２リブ３６ｂ、第２リブ３６ｃ、第２リブ３６ｄ、第２リブ３６ｅが形成されている。これら複数の第２リブ３６は、フロントカバー７の上下方向（Ｚ軸に沿った方向）に沿って、互いに間隔を空けて離間している。 The second guide rib row 34 has a plurality of second ribs 36 arranged in series along the vertical direction of the front cover 7 (direction along the Z axis). On the front cover 7, a second rib 36a, a second rib 36b, a second rib 36c, a second rib 36d, and a second rib 36e are formed as a second guide rib row 34 in order from above in the vertical direction of the front cover 7. has been done. The plurality of second ribs 36 are spaced apart from each other along the vertical direction of the front cover 7 (direction along the Z-axis).
　ガイドリブ３１の一部は、第１ボルト貫通孔１５が形成されたボルトボス部３７に接続されている。詳述すると、第１リブ３５ｅの下端と第１リブ３５ｆの上端は、ボルトボス部３７ａに接続されている。第１リブ３５ｆの下端及び第２リブ３６ｅの下端は、ボルトボス部３７ｂに接続されている。ボルトボス部３７ａは、フロントカバー７の下方に位置している。ボルトボス部３７ｂは、フロントカバー７の下端に位置している。 A portion of the guide rib 31 is connected to a bolt boss portion 37 in which the first bolt through hole 15 is formed. Specifically, the lower end of the first rib 35e and the upper end of the first rib 35f are connected to the bolt boss portion 37a. The lower end of the first rib 35f and the lower end of the second rib 36e are connected to the bolt boss portion 37b. The bolt boss portion 37a is located below the front cover 7. The bolt boss portion 37b is located at the lower end of the front cover 7.
　ガイドリブ３１は、クランクプーリ対向部２１の外周縁に形成されている。換言すると、ガイドリブ３１は、クランクスプロケット１２の外周縁に隣接した位置に形成されている。詳述すると、フロントカバー７は、第１リブ３５ｄの下部、第１リブ３５ｅ、第１リブ３５ｆの上部、第２リブ３６ｃの下部、第２リブ３６ｄ及び第２リブ３６ｅの上部がクランクプーリ対向部２１の外周縁に位置するよう形成されている。 The guide rib 31 is formed on the outer peripheral edge of the crank pulley facing portion 21. In other words, the guide rib 31 is formed at a position adjacent to the outer peripheral edge of the crank sprocket 12. In detail, the front cover 7 has a lower part of the first rib 35d, a first rib 35e, an upper part of the first rib 35f, a lower part of the second rib 36c, and an upper part of the second rib 36d and the second rib 36e facing the crank pulley. It is formed so as to be located at the outer peripheral edge of the portion 21.
　また、ガイドリブ３１は、吸気カムスプロケット１１ａの外周縁に隣接した位置に形成されている。換言すると、ガイドリブ３１は、フロントカバー７のカムスプロケット対向部４１の外周縁に形成されている。カムスプロケット対向部４１は、吸気カムスプロケット１１ａを覆うフロントカバー７の平板状の部分である。詳述すると、フロントカバー７は、第１リブ３５ａ、第１リブ３５ｂの上端、第２リブ３６ａ及び第２リブ３６ｂの上端が吸気カムスプロケット１１ａの外周縁に隣接した位置に形成されている。 Further, the guide rib 31 is formed at a position adjacent to the outer peripheral edge of the intake cam sprocket 11a. In other words, the guide rib 31 is formed on the outer peripheral edge of the cam sprocket facing portion 41 of the front cover 7 . The cam sprocket opposing portion 41 is a flat portion of the front cover 7 that covers the intake cam sprocket 11a. Specifically, in the front cover 7, the upper ends of the first rib 35a and the first rib 35b, and the upper ends of the second rib 36a and the second rib 36b are formed at positions adjacent to the outer peripheral edge of the intake cam sprocket 11a.
　上述した実施例の内燃機関１は、フロントカバー７の内側面７ａとガイドリブ３１と内燃機関本体８の気筒列方向の一端側の端面８ａとによって、トンネル状のオイルレベルゲージ通路３２が形成されている。 In the internal combustion engine 1 of the embodiment described above, a tunnel-shaped oil level gauge passage 32 is formed by the inner surface 7a of the front cover 7, the guide rib 31, and the end surface 8a of the internal combustion engine main body 8 on one end side in the cylinder row direction. There is.
　そのため、ガイドリブ３１は、トンネル状のオイルレベルゲージ通路３２の一部を構成しつつ、フロントカバー７の剛性向上に寄与している。 Therefore, the guide rib 31 contributes to improving the rigidity of the front cover 7 while forming a part of the tunnel-shaped oil level gauge passage 32.
　内燃機関１は、ガイドリブ３１がフロントカバー７の剛性が向上させるため、フロントカバー７の膜振動を抑制できる。 In the internal combustion engine 1, since the guide ribs 31 improve the rigidity of the front cover 7, membrane vibration of the front cover 7 can be suppressed.
　ガイドリブ３１は、フロントカバー７の外周縁に沿って形成されている。これによって、ガイドリブ３１は、フロントカバー７の外周縁と対向させることが可能となる。具体的には、第２ガイドリブ列３４は、第１ガイドリブ列３３と対向していない部分をフロントカバー７の外周縁の縦壁７ｃと対向させることが可能となる。第１リブ３５ｄと第１リブ３５ｅの上下方向に沿った間隔が大きくなっているが、この間は、第１ガイドリブ列３３に代わってフロントカバー７の外周縁がトンネル状のオイルレベルゲージ通路３２の壁面の一部を構成する。つまり、オイルレベルゲージ通路３２は、ガイドリブ３１とフロントカバー７の外周縁の縦壁７ｃとの間に形成される。 The guide rib 31 is formed along the outer peripheral edge of the front cover 7. This allows the guide rib 31 to face the outer peripheral edge of the front cover 7. Specifically, a portion of the second guide rib row 34 that does not face the first guide rib row 33 can be made to face the vertical wall 7c of the outer peripheral edge of the front cover 7. The distance between the first rib 35d and the first rib 35e in the vertical direction is increased, but during this time, the outer peripheral edge of the front cover 7 is replaced by the first guide rib row 33 as a tunnel-shaped oil level gauge passage 32. It forms part of the wall. That is, the oil level gauge passage 32 is formed between the guide rib 31 and the vertical wall 7c on the outer peripheral edge of the front cover 7.
　すなわち、オイルレベルゲージ通路３２は、フロントカバー７に元々形成されていた外周縁の縦壁７ｃを利用して構成することが可能となる。 That is, the oil level gauge passage 32 can be constructed using the vertical wall 7c on the outer periphery that was originally formed on the front cover 7.
　従って、内燃機関１は、材料、重量の増加を抑制しつつ、トンネル状のオイルレベルゲージ通路３２を構成することができる。 Therefore, the internal combustion engine 1 can configure the tunnel-shaped oil level gauge passage 32 while suppressing increases in materials and weight.
　また、内燃機関１は、相対的に外力が作用し易いフロントカバー７の外周縁（外縁）をオイルレベルゲージ通路３２を構成するガイドリブ３１を利用して補強することができる。 Further, in the internal combustion engine 1, the outer peripheral edge (outer edge) of the front cover 7, which is relatively susceptible to external force, can be reinforced by using the guide ribs 31 forming the oil level gauge passage 32.
　フロントカバー７のクランクプーリ対向部２１は、平板状に形成されており、構造上、剛性を高くしにくくなっている。 The crank pulley facing portion 21 of the front cover 7 is formed into a flat plate shape, which makes it difficult to increase the rigidity due to its structure.
　しかしながら、内燃機関１は、このようなフロントカバー７のクランクプーリ対向部２１の外周縁に隣接するようにガイドリブ３１を設けることで、クランクシャフト貫通孔１４の周囲のクランクプーリ対向部２１の剛性を向上させ、膜振動の抑制を図ることができる。 However, in the internal combustion engine 1, the rigidity of the crank pulley facing part 21 around the crankshaft through hole 14 is reduced by providing the guide rib 31 adjacent to the outer peripheral edge of the crank pulley facing part 21 of the front cover 7. It is possible to improve this and suppress membrane vibration.
　内燃機関１は、複数のリブ２２がクランクプーリ対向部２１の外側面に形成されているので、フロントカバー７のクランクシャフト貫通孔１４付近（クランクプーリ対向部２１）の剛性を向上させることができる。 In the internal combustion engine 1, since the plurality of ribs 22 are formed on the outer surface of the crank pulley facing portion 21, the rigidity of the vicinity of the crankshaft through hole 14 of the front cover 7 (crank pulley facing portion 21) can be improved. .
　フロントカバー７のカムスプロケット対向部４１は、平板状に形成されており、構造上、剛性を高くしにくくなっている。 The cam sprocket facing portion 41 of the front cover 7 is formed into a flat plate shape, and structurally, it is difficult to increase the rigidity.
　しかしながら、内燃機関１は、このようなフロントカバー７のカムスプロケット対向部４１の外周縁に隣接するようにガイドリブ３１を設けることで、カムスプロケット対向部４１の剛性を向上させ、膜振動の抑制を図ることができる。 However, in the internal combustion engine 1, by providing the guide rib 31 adjacent to the outer peripheral edge of the cam sprocket facing part 41 of the front cover 7, the rigidity of the cam sprocket facing part 41 is improved and membrane vibration is suppressed. can be achieved.
　内燃機関１は、ガイドリブ３１がボルトボス部３７に接続されている。そのため、内燃機関１は、ガイドリブ３１とボルトボス部３７を協働させてフロントカバー７の剛性を向上させることができる。 In the internal combustion engine 1, the guide rib 31 is connected to the bolt boss portion 37. Therefore, in the internal combustion engine 1, the rigidity of the front cover 7 can be improved by making the guide ribs 31 and the bolt boss portions 37 work together.
　以上、本発明の具体的な実施例を説明してきたが、本発明は、上述した実施例に限定されるものではなく、その趣旨を逸脱しない範囲で種々の変更が可能である。 Although specific embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and various changes can be made without departing from the spirit thereof.
　また、例えば、第１ガイドリブ列３３の第１リブ３５の個数は、６つに限定されるものではなく、６つ以外でもよい。また、第２ガイドリブ列３４の第２リブ３６の個数は、５つに限定されるものではなく、５つ以外でもよい。 Furthermore, for example, the number of first ribs 35 in the first guide rib row 33 is not limited to six, and may be other than six. Further, the number of second ribs 36 in the second guide rib row 34 is not limited to five, and may be other than five.

Claims (6)

  1. 　内側面が内燃機関本体の気筒列方向の一端側の端面と対向し、上記内燃機関本体の気筒列方向の一端側の端面を覆う樹脂製のフロントカバーを有し、
    　上記フロントカバーは、オイルレベルゲージが挿入されるゲージ差し込み口と、該ゲージ差し込み口から挿入された上記オイルレベルゲージを案内する突条のガイドリブと、を有し、
    　上記ガイドリブは、上記フロントカバーの上記内側面に形成され、
    　上記内側面と上記ガイドリブと上記内燃機関本体の気筒列方向の一端側の端面とによって、上記オイルレベルゲージが通るオイルレベルゲージ通路が形成されている内燃機関。     a resin front cover whose inner surface faces an end face on one end side in the cylinder row direction of the internal combustion engine main body and covers the end face on the one end side in the cylinder row direction of the internal combustion engine main body,
    The front cover has a gauge insertion port into which an oil level gauge is inserted, and a protruding guide rib that guides the oil level gauge inserted from the gauge insertion port,
    The guide rib is formed on the inner surface of the front cover,
    An internal combustion engine, wherein an oil level gauge passage through which the oil level gauge passes is formed by the inner surface, the guide rib, and an end face of the internal combustion engine main body on one end side in a cylinder row direction.
  2. 　上記ガイドリブは、上記フロントカバーの外周縁に沿って形成されている請求項１に記載の内燃機関。 The internal combustion engine according to claim 1, wherein the guide rib is formed along an outer peripheral edge of the front cover.
  3. 　上記フロントカバーは、クランクシャフトが貫通するクランクシャフト貫通孔を有し、
    　上記クランクシャフトに取り付けられたクランクプーリと上記内燃機関本体とに挟まれた上記クランクシャフト貫通孔の外周側の部分であるクランクプーリ対向部の外周縁に、上記ガイドリブが形成されている請求項１または２に記載の内燃機関。     The front cover has a crankshaft through hole through which the crankshaft passes,
    Claim 1: The guide rib is formed on an outer peripheral edge of a crank pulley facing portion that is a portion on the outer peripheral side of the crankshaft through hole that is sandwiched between a crank pulley attached to the crankshaft and the internal combustion engine main body. or the internal combustion engine described in 2.
  4. 　上記クランクプーリ対向部の外側面には、ガイドリブと交差するように複数の突状のリブが形成されている請求項３に記載の内燃機関。 The internal combustion engine according to claim 3, wherein a plurality of protruding ribs are formed on the outer surface of the crank pulley facing portion so as to intersect with the guide ribs.
  5. 　上記フロントカバーは、上記内燃機関本体の気筒列方向の一端側の端面から突出したカムシャフトの端部に取り付けられたカムスプロケットを覆うものであって、
    　上記カムスプロケットの外周縁に上記ガイドリブが形成されている請求項１または２に記載の内燃機関。     The front cover covers a cam sprocket attached to an end of a camshaft protruding from an end face of the internal combustion engine main body on one end side in the cylinder row direction,
    The internal combustion engine according to claim 1 or 2, wherein the guide rib is formed on the outer peripheral edge of the cam sprocket.
  6. 　上記ガイドリブは、上記フロントカバーを上記内燃機関本体に締結するボルトが貫通するボルトボスに接続されている請求項１または２に記載の内燃機関。 The internal combustion engine according to claim 1 or 2, wherein the guide rib is connected to a bolt boss through which a bolt for fastening the front cover to the internal combustion engine main body passes.
PCT/JP2022/022739 2022-06-06 2022-06-06 Internal combustion engine WO2023238178A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3107219U (en) * 2004-08-13 2005-01-27 力釧實業股▲ふん▼有限公司 Motorcycle left crankbox cover
JP2005299566A (en) * 2004-04-14 2005-10-27 Honda Motor Co Ltd Internal combustion engine
JP2015034528A (en) * 2013-08-09 2015-02-19 本田技研工業株式会社 Case member of internal combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005299566A (en) * 2004-04-14 2005-10-27 Honda Motor Co Ltd Internal combustion engine
JP3107219U (en) * 2004-08-13 2005-01-27 力釧實業股▲ふん▼有限公司 Motorcycle left crankbox cover
JP2015034528A (en) * 2013-08-09 2015-02-19 本田技研工業株式会社 Case member of internal combustion engine

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