JP6565396B2 - Lubrication mechanism of internal combustion engine - Google Patents

Description

  The present invention relates to a lubrication mechanism for an internal combustion engine, and more particularly to a lubrication mechanism for an internal combustion engine that can efficiently supply oil when the internal combustion engine is started.

  In the internal combustion engine, as disclosed in Patent Document 1, a configuration in which a valve chamber is provided inside a cylinder head is known, and the valve chamber is configured to open and close an intake / exhaust valve. The valve operating mechanism is provided. The valve mechanism includes a camshaft and a cam that rotate integrally, and a rocker arm that swings as the cam rotates, and the intake and exhaust valves are opened and closed by swinging the rocker arm. At the time of opening and closing, the cam comes into contact with the roller of the rocker arm so as to be able to roll.

JP 2011-208545 A

  In the cam or roller in the valve mechanism, there is a problem that if the internal combustion engine is left stopped for a long period of time, the attached oil falls down downward. For this reason, when the internal combustion engine is restarted, the engine runs out of oil, and there is a risk that the cam or the like is not sufficiently lubricated and deteriorates due to friction or generates noise. There is. After starting the internal combustion engine, oil is supplied from the predetermined oil passage to the valve operating mechanism by driving the oil pump. However, in the initial stage immediately after starting, the oil supply is continued until the air in the oil passage etc. is released. There will be no or insufficient and the above-mentioned problems will occur.

  Here, in Patent Document 1, the oil collected in the concave oil reservoir is supplied to the camshaft. However, when the internal combustion engine is stopped for a long time, the oil in the oil reservoir flows out. Therefore, the above problem cannot be solved.

  The present invention has been made in view of this point, and an object of the present invention is to provide a lubrication mechanism for an internal combustion engine that can effectively supply oil to a valve mechanism before the internal combustion engine is started.

An internal combustion engine lubrication mechanism of the present invention is an internal combustion engine lubrication mechanism for supplying oil to a valve operating mechanism disposed in a cylinder head in an internal combustion engine mounted on a motorcycle, An oil reservoir is provided above the mechanism. The oil reservoir forms a storage space for storing oil when the vehicle body is inclined, and can receive oil from below, and one end of the bottom And a supply port for supplying oil and a side surface portion rising from the other end side of the bottom surface portion, and the bottom surface portion is lower than the one end side when the vehicle body is inclined, and the storage space When the inclined state is changed to the upright state, one end side is lower than the other end side, and the oil stored in the storage space is supplied from the supply port toward the valve operating mechanism, and the bottom surface On the part The side surface portion is provided so as to connect the top surface portion and the bottom surface portion, and the oil attached to the top surface portion is in a state where the vehicle body is inclined. It flows into the bottom part through the side part .

According to this configuration, oil can be stored in the oil reservoir simply by inclining the vehicle body, and oil can be supplied to the valve mechanism simply by moving the inclined vehicle body in the upright direction. it can. Accordingly, oil can be supplied to the valve operating mechanism without starting the internal combustion engine, and a lubricating effect by the oil can be obtained when the internal combustion engine is started. As a result, even when the internal combustion engine is stopped for a long time and the oil adhering to the valve operating mechanism falls down downward, the accumulated oil can be supplied to the valve operating mechanism, and the friction in the valve operating mechanism can be reduced. It is possible to reduce deterioration and noise generation. Further, the oil reservoir can be formed by a simple configuration of the bottom surface, the side surface, and the supply port, and the oil can be supplied without using a mechanism for pumping oil. Thereby, the man-hours for processing and assembly and the number of parts can be suppressed, and an improvement in productivity can be achieved. Furthermore, the oil scattered by the driving of the valve mechanism and adhering to the top surface portion can be stored in the oil reservoir. Therefore, for example, by making the inner surface of the cylinder head cover the top surface portion, it is possible to increase the oil collection efficiency without increasing the number of parts. The internal combustion engine lubrication mechanism of the present invention is an internal combustion engine lubrication mechanism for supplying oil to a valve operating mechanism disposed in a cylinder head in an internal combustion engine mounted on a motorcycle, An oil reservoir is provided above the valve mechanism, and the oil reservoir forms a storage space for storing oil in a state where the vehicle body is inclined, and a bottom portion capable of receiving oil from below, and a bottom portion of the bottom portion. A supply port that is formed on one end side and supplies oil and a side surface portion that rises from the other end side of the bottom surface portion, and the bottom surface portion is lower in the other end side than the one end side when the vehicle body is inclined. While forming the storage space, when the inclined state becomes an upright state, one end side is lower than the other end side, and the oil stored in the storage space is supplied from the supply port toward the valve operating mechanism, Auto The wheelset includes a stand that maintains a self-supporting state in which the vehicle body is inclined, and the stand is provided on the other end side in a direction connecting the one end and the other end of the bottom surface portion of the vehicle body, and the oil reservoir portion The oil is stored in the self-standing state by the stand, and when the vehicle body is brought close to the upright state from the self-standing state, the stored oil is supplied toward the valve operating mechanism. According to this configuration, oil can be stored in the oil reservoir simply by inclining the vehicle body, and oil can be supplied to the valve mechanism simply by moving the inclined vehicle body in the upright direction. it can. Accordingly, oil can be supplied to the valve operating mechanism without starting the internal combustion engine, and a lubricating effect by the oil can be obtained when the internal combustion engine is started. As a result, even when the internal combustion engine is stopped for a long time and the oil adhering to the valve operating mechanism falls down downward, the accumulated oil can be supplied to the valve operating mechanism, and the friction in the valve operating mechanism can be reduced. It is possible to reduce deterioration and noise generation. Further, the oil reservoir can be formed by a simple configuration of the bottom surface, the side surface, and the supply port, and the oil can be supplied without using a mechanism for pumping oil. Thereby, the man-hours for processing and assembly and the number of parts can be suppressed, and an improvement in productivity can be achieved. In addition, when parking using a stand, etc., oil is stored in the oil reservoir, and the vehicle body is brought upright to prepare for departure from this state, so that oil is supplied from the oil reservoir to the valve mechanism. can do. Thus, the oil can be easily and reliably supplied to the valve operating mechanism by an operation in which the driver releases the stand or moves the vehicle body before starting the internal combustion engine.

  In the lubricating mechanism for an internal combustion engine according to the present invention, the oil reservoir portion may be formed in a housing disposed above the valve operating mechanism, and the upper surface side of the housing is depressed. In this configuration, by forming the oil reservoir in the housing, it is possible to increase the degree of design freedom with respect to the position where the oil reservoir is formed, and the lubrication effect in the valve mechanism can be improved.

  In the lubricating mechanism for an internal combustion engine according to the present invention, the oil reservoir may include an opening that opens an upper portion. In this configuration, oil scattered by driving the valve mechanism during engine operation can be efficiently stored in the oil reservoir through the opening.

  In the internal combustion engine lubrication mechanism of the present invention, further comprising a top surface portion formed at a predetermined interval above the bottom surface portion, the side surface portion is provided to connect the top surface portion and the bottom surface portion, In a state where the vehicle body is inclined, the oil attached to the top surface portion may flow through the side surface portion and onto the bottom surface portion. In this configuration, the oil scattered by the driving of the valve mechanism and adhering to the top surface portion can be stored in the oil reservoir. Therefore, for example, by making the inner surface of the cylinder head cover the top surface portion, it is possible to increase the oil collection efficiency without increasing the number of parts.

  In the internal combustion engine lubrication mechanism according to the present invention, the valve mechanism preferably includes a camshaft having a plurality of cams, and the oil reservoir is provided above each of the cams. In this configuration, oil can be intensively supplied to a cam that easily generates friction, and the lubrication effect around the cam can be improved to further reduce deterioration and noise generation.

  In the lubricating mechanism of the internal combustion engine of the present invention, the motorcycle includes a stand that maintains a self-supporting state in which a vehicle body is inclined, and the oil reservoir portion stores oil in the self-supporting state by the stand. When the vehicle body is raised to approach an upright state, the accumulated oil may be supplied toward the valve mechanism. In this configuration, oil is stored in the oil reservoir when parking using a stand, etc., and the vehicle body is placed upright to prepare for departure from this state. Can be supplied. Thus, the oil can be easily and reliably supplied to the valve operating mechanism by an operation in which the driver releases the stand or moves the vehicle body before starting the internal combustion engine.

  According to the present invention, the oil can be stored and supplied in the oil reservoir by the inclination of the vehicle body, and the oil can be effectively supplied to the valve mechanism before the internal combustion engine is started.

It is the schematic perspective view which looked at the internal combustion engine which concerns on this Embodiment from diagonally backward. It is a top view of FIG. FIG. 3 is a cross-sectional view of the camshaft and the housing along the line AA in FIG. 2. FIG. 3 is a partially enlarged view of FIG. 2. It is an expanded sectional view for demonstrating storage of the oil in an oil reservoir part. It is an expanded sectional view for demonstrating supply of the oil from an oil reservoir part. It is sectional drawing similar to FIG. 5 regarding the oil sump part which concerns on a modification. It is sectional drawing similar to FIG. 6 regarding the oil sump part which concerns on a modification.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following, an example in which the internal combustion engine of the present invention is a parallel four-cylinder engine mounted on a motorcycle will be described, but the application target is not limited to this and can be changed. For example, the internal combustion engine according to the present invention may be a single cylinder engine, a parallel two-cylinder engine, or a V-type engine. Except for the lubrication mechanism according to the present invention, well-known components are employed for the motorcycle and the internal combustion engine, and their overall views are omitted. In the following drawings, some components may be omitted for convenience of explanation.

  With reference to FIG.1 and FIG.2, some schematic structures of the internal combustion engine which concerns on this Embodiment are demonstrated. FIG. 1 is a schematic perspective view of the internal combustion engine according to the present embodiment as viewed obliquely from the rear, and FIG. 2 is a plan view of FIG. Here, in the following drawings, the front of the motorcycle (not shown) is indicated by arrow FR, the rear of the vehicle is indicated by arrow RE, the left side of the vehicle is indicated by arrow L, the right side of the vehicle is indicated by arrow R, the vehicle width direction is indicated by arrow W, and the upper side is indicated by arrow. T and the lower side are indicated by arrows B, respectively.

  As shown in FIGS. 1 and 2, the engine (internal combustion engine) 10 is supported in a suspended state by a frame (not shown) of a motorcycle. The engine 10 includes a cylinder head 11 attached above a cylinder (not shown). The cylinder head 11 is provided in a shape that opens the top, and the top is closed by a cylinder head cover (not shown). Here, the engine 10 according to the present embodiment is a horizontal crank type parallel 4-cylinder engine. Therefore, an intake port 12 is provided on the rear surface of the cylinder head 11, and an exhaust port 13 (not shown in FIG. 1) is provided on the front surface at four positions. An exhaust pipe (not shown) is connected to the exhaust port 13, and an air cleaner (not shown) and a fuel injection device (not shown) are connected to the intake port 12.

  Between the cylinder head 11 and a cylinder head cover (not shown), a camshaft 15 extending in the left-right direction, which is the vehicle width direction, is provided. The camshaft 15 is rotatably disposed inside the cylinder head 11 and two camshafts 15 are provided side by side. A plurality of cams 16 are formed on the camshaft 15 in accordance with the arrangement positions of intake valves and exhaust valves (both not shown). The camshaft 15 and the cam 16 rotate integrally, and the intake valve and the exhaust valve are reciprocated by the rotating cam 16. At this time, the rotating cam 16 contacts the intake valve mechanism and the exhaust valve mechanism, or contacts a rocker arm (not shown), and presses so as to rub against each other to reciprocate the intake valve and the exhaust valve. Here, a valve operating mechanism is constituted by the camshaft 15, the cam 16, the rocker arm and the like for reciprocating the intake valve and the exhaust valve.

  Housings 20 are respectively disposed above the front and rear camshafts 15, and the two housings 20 have the same structure. The housing 20 is fixed to the cylinder head 11 via a fastener (not shown) such as a bolt. The housing 20 is provided so as to sandwich the camshaft 15 vertically with the cylinder head 11. A bearing structure (not shown) is provided between the housing 20 and the cylinder head 11 and the camshaft 15, and the camshaft 15 is rotatably supported via this bearing structure. The bearing structure is provided on both sides of the cam 16 in the axial direction, and the housing 20 is installed over the cam so as to connect the bearing structures. An oil reservoir 30 which will be described later is formed in this installation portion.

  The housing 20 includes a housing main body 21 having a substantially rectangular shape that is long in the vehicle body width direction in plan view, and a plurality of oil reservoirs 30 formed on the upper surface side of the housing main body 21. Each oil reservoir 30 is formed in a square shape in plan view.

  3 is a cross-sectional view of the camshaft and the housing along the line AA in FIG. As shown in FIG. 3, the oil reservoir 30 is formed above each of the plurality of cams 16. The oil reservoir 30 is formed in a concave shape in which the upper surface side of the housing body 21 is recessed. Therefore, the oil reservoir 30 is formed with an opening 31 that opens the top. In order to secure the volume of the oil reservoir 30, a protruding portion that protrudes upward may be provided on the periphery of the opening 31.

  FIG. 4 is a partially enlarged view of FIG. FIG. 5 is an enlarged cross-sectional view for explaining oil storage in the oil reservoir. As shown in FIGS. 4 and 5, the oil reservoir 30 includes a left side surface portion 32, a right side surface portion 33, a front surface portion 34 and a rear surface portion 35 (not shown in FIG. 5) depending on the formation edge of the opening 31, and a left side surface portion. 32, a bottom surface portion 36 connected to the lower ends of the front surface portion 34 and the rear surface portion 35, and a supply port 37 formed so as to penetrate the housing main body 21 between the right end side (one end side) and the right side surface portion 33 of the bottom surface portion 36. And. The left side surface portion 32 rises from the left end side (the other end side) of the bottom surface portion 36, and the front surface portion 34 and the rear surface portion 35 rise from the front end and rear end side of the bottom surface portion 36. The supply port 37 is formed in a slot hole shape extending in the front-rear direction, and is provided so as to be directly above the cam 16 in a state where the motorcycle is upright. In order to ensure the dripping onto the cam 16, a protrusion protruding downward from the periphery of the supply port 37 may be provided.

  FIG. 6 is an enlarged cross-sectional view for explaining the supply of oil from the oil reservoir. Here, in FIG.5 and FIG.6, the side stand S which hold | maintains the vehicle body of a motorcycle (not shown) in the self-supporting state inclined to the left is written together typically. The side stand S is provided on the left side of the vehicle body so as to be rotatable between a standing position shown in FIG. 5 (a position where the vehicle body is held in a self-supporting state) and a storage position shown in FIG. When the vehicle is parked or parked, as shown in FIG. 5, the vehicle body is in a self-supporting state with the side stand S as an upright position. At this time, the vehicle body is slightly inclined in the direction of falling to the left, and the axis of the camshaft 15 is also inclined downward to the left. On the other hand, as shown in FIG. 6, when traveling (straightly traveling), the vehicle body is in an upright state with the side stand S as the storage position, that is, the vehicle body is not tilted to the left and right, and the axis of the camshaft 15 is directed horizontally. It is done.

  As shown in FIG. 5, in the self-supporting state where the vehicle body is self-supporting on the side stand S, the bottom surface portion 36 is lower on the side opposite to the supply port 37. That is, the left side (other end side) of the bottom surface part 36 is lower than the right end side (one end side) of the bottom surface part 36. In other words, the bottom surface portion 36 is in a state where the left side surface portion 32 side is lower than the supply port 37 side and is inclined downwardly to the left. Accordingly, the left side surface portion 32, the front surface portion 34, the rear surface portion 35 (not shown in FIG. 5, refer to FIG. 4), and the bottom surface portion 36 are formed in a bottomed container shape, and a storage space in which oil OL can be stored inside them. 38 is formed. At this time, the bottom surface portion 36 receives the oil OL from below. Note that the inclination angle in the left-right direction of the bottom surface portion 36 is set to an angle between the inclination angle in the left-right direction of the camshaft and the horizontal in a self-supporting state in which the vehicle body is independent on the side stand S.

  On the other hand, as shown in FIG. 6, when the side stand S is housed and the vehicle body is in an upright state, the inclination direction of the bottom surface portion 36 is the direction opposite to the inclination direction shown in FIG. It becomes. In other words, the bottom surface portion 36 is directed in a direction in which the supply port 37 side is inclined lower than the left side surface portion 32 side. Therefore, the oil OL stored in the storage space 38 is dripped through the supply port 37. Since the supply port 37 is disposed directly above the cam 16, the oil OL is supplied from the supply port 37 toward the cam 16.

  In the above configuration, the oil is scattered in the cylinder head 11 (see FIG. 1) due to the supply of lubricating oil during the operation of the engine, the rotation of the camshaft 15, and the like. The scattered oil OL falls downward when the vehicle is parked or parked and accumulates in the cylinder head 11, and a part of the oil OL also falls into the oil reservoir 30 through the opening 31. In the oil reservoir 30, the storage space 38 is formed as shown in FIG. 5 when parking using the stand S, etc., so that the oil OL collected in the oil reservoir 30 is stored in the storage space 38. Can do. When the vehicle body is raised from this state and brought close to an upright state, the bottom surface portion 36 inclined downward to the left is inclined downward as shown in FIG. 6, and the oil OL stored in the storage space 38 is supplied to the supply port 37. To the cam 16 and supplied.

  Therefore, before the engine 10 is started, the oil OL can be supplied to the cam 16 without the driver being aware by the operation of releasing the independence by the stand S or moving the vehicle body. In addition, the oil OL can be supplied without using an oil pump or an oil passage, and through the simplification of the structure of the engine 10, it is possible to reduce man-hours for processing and assembly and reduce the number of parts, thereby improving productivity. .

  As described above, according to the present embodiment, the oil OL can be supplied to the cam 16 immediately after the engine 10 is stopped for a long time and immediately before the engine 10 is restarted, thereby obtaining a lubricating effect. Thereby, even when the oil OL adhering to the cam 16 falls off due to a long-time stop, the cam 16 is lubricated by the oil OL at the start of the start, and it is possible to avoid deterioration due to friction at the cam 16 and generation of noise. it can. Note that, immediately after the engine 10 is started, oil OL is supplied to the valve mechanism including the cam 16 by driving an oil pump (not shown).

  In addition, since the oil reservoir 30 is formed in the housing 20, the degree of freedom in the layout of the oil reservoir 30 can be increased, and the design can be facilitated so that the lubricating effect is enhanced. Furthermore, by enlarging the opening 31, a large oil OL collection region can be secured, and the oil OL can be collected and supplied efficiently.

  Furthermore, since a plurality of oil reservoirs 30 are formed in accordance with the plurality of cams 16, the lubricating effect around the cams 16 can be further improved, and deterioration of the cams 16 and generation of noise can be prevented.

  In addition, this invention is not limited to the said embodiment, It can change and implement variously. In the above-described embodiment, the size, position, shape, and the like illustrated in the accompanying drawings are not limited to this, and can be appropriately changed within a range in which the effect of the present invention is exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

  For example, in the above-described embodiment, the oil is supplied to the cam 16 by the oil reservoir 30. However, the present invention is not limited to this. In addition to the cam 16, or in place of the cam 16, other configurations (for example, a rocker) Oil may be supplied to the arm or the like).

  The planar shapes of the opening 31 and the supply port 37 of the oil reservoir 30 are not limited to the illustrated examples, and may be changed as long as oil can be supplied in the same manner as in the above embodiment. For example, the opening 31 may have a triangular shape having the apex on the supply port 37 side, the supply port 37 may have a circular shape, and the supply position of the oil OL may have a dot shape.

  Further, the shape of the bottom surface portion 36 can be variously changed, and may be formed so that a step is generated in a cross-sectional view in the left-right direction shown in FIGS. 5 and 6. Furthermore, when the vehicle body is in an upright state, the bottom surface 36 may be leveled without being lowered to the right as long as the oil OL can be supplied from the supply port 37. Further, the bottom surface portion 36 may be formed in a U-shape or a V-shape in which the center in the front-rear direction is recessed when viewed in cross-section in the front-rear direction. You may form in a funnel shape also including the supply port 37. FIG.

  Further, as shown in FIGS. 7 and 8, the oil reservoir 40 may be provided in the cylinder head cover 50. FIG. 7 is a cross-sectional view similar to FIG. 5 regarding the oil reservoir according to the modification, and FIG. 8 is a cross-sectional view similar to FIG. 6 regarding the oil reservoir according to the modification.

  The oil reservoir 40 according to the modification is provided on an inner surface 51 a as a top surface portion of the upper wall 51 of the cylinder head cover 50. The oil reservoir 40 has a bottom surface portion 46 formed at a predetermined interval downward from the inner surface 51a, and a side surface portion that rises from the left end side of the bottom surface portion 46 and connects the inner surface 51a and the bottom surface portion 46. 42. A front surface portion 44 and a rear surface portion (not shown) provided so as to close the space between the inner surface 51a are provided on the front and rear end sides of the bottom surface portion 46 and the side surface portion 42, and the right end side thereof is opened to supply port 47. And the interior thereof is formed as a storage space 48. The inclination of the bottom surface portion 46 is set in the same manner as the bottom surface portion 36 of the above-described embodiment, and is lowered to the left in the state shown in FIG. 7, and the oil OL is stored in the storage space 48 in the same manner as in the state shown in FIG. Is done. On the other hand, in the state shown in FIG. 8, the oil OL stored in the storage space 48 is supplied to the cam 16 from the supply port 47 with the bottom surface portion 46 lowered to the right as in the state shown in FIG. 6.

  Here, in the state shown in FIG. 7, the scattered oil OL adheres to the inner surface 51 a of the upper wall 51 of the cylinder head cover 50. The attached oil OL flows to the left side on the inner surface 51a due to the inclination of the vehicle body, and the oil OL that reaches the oil reservoir 40 flows into the bottom surface 46 through the supply port 47. Accordingly, the oil OL can be collected in the storage space 48 of the oil reservoir 40 using the cylinder head cover 50, and the collection efficiency of the oil OL can be increased without increasing the number of parts.

  As described above, the present invention has an effect that oil can be effectively supplied to the valve operating mechanism before starting the internal combustion engine, and the vehicle body is tilted when parked or stopped. This is useful for an internal combustion engine mounted on a motorcycle.

10 Engine (Internal combustion engine)
11 Cylinder head 15 Camshaft (valve mechanism)
16 cam (valve mechanism)
20 Housing 30, 40 Oil reservoir 32 Left side surface (side surface)
36, 46 Bottom part 37, 47 Supply port 38, 48 Storage space 42 Side part OL Oil S Side stand (stand)

Claims (7)

In an internal combustion engine mounted on a motorcycle, a lubrication mechanism of the internal combustion engine that supplies oil to a valve operating mechanism disposed inside a cylinder head,
An oil reservoir is provided above the valve mechanism, and the oil reservoir forms a storage space for storing oil when the vehicle body is tilted, and a bottom surface capable of receiving oil from below, and the bottom surface A supply port for supplying oil formed on one end side, and a side portion rising from the other end side of the bottom surface portion,
The bottom surface portion has the other end side lower than the one end side in a state where the vehicle body is inclined to form the storage space, while the one end side is lower than the other end side when the inclined state is changed to the upright state. Supplying oil stored in the storage space from the mouth toward the valve mechanism;
A top surface portion formed at a predetermined interval above the bottom surface portion;
The side surface portion is provided to connect the top surface portion and the bottom surface portion,
A lubricating mechanism for an internal combustion engine, wherein oil attached to the top surface portion flows into the bottom surface portion through the side surface portion in a state where the vehicle body is inclined . In an internal combustion engine mounted on a motorcycle, a lubrication mechanism of the internal combustion engine that supplies oil to a valve operating mechanism disposed inside a cylinder head,
An oil reservoir is provided above the valve mechanism, and the oil reservoir forms a storage space for storing oil when the vehicle body is tilted, and a bottom surface capable of receiving oil from below, and the bottom surface A supply port for supplying oil formed on one end side, and a side portion rising from the other end side of the bottom surface portion,
The bottom surface portion has the other end side lower than the one end side in a state where the vehicle body is inclined to form the storage space, while the one end side is lower than the other end side when the inclined state is changed to the upright state. Supplying oil stored in the storage space from the mouth toward the valve mechanism;
The motorcycle includes a stand that maintains a self-supporting state in which the vehicle body is inclined, and the stand is provided on the other end side in a direction connecting one end and the other end of the bottom surface portion of the vehicle body,
The oil reservoir part stores oil in the self-standing state by the stand, and supplies the stored oil toward the valve mechanism when the vehicle body is brought close to an upright state from the self-standing state. Lubrication mechanism for internal combustion engines. The said oil sump part is provided in the housing arrange | positioned above the said valve mechanism, and is formed by depressing the upper surface side of this housing, The Claim 1 or Claim 2 characterized by the above-mentioned. Lubrication mechanism for internal combustion engines.   4. The lubrication mechanism for an internal combustion engine according to claim 1, wherein the oil reservoir has an opening that opens an upper portion. A top surface portion formed at a predetermined interval above the bottom surface portion;
The side surface portion is provided to connect the top surface portion and the bottom surface portion,
3. The lubricating mechanism for an internal combustion engine according to claim 2 , wherein oil attached to the top surface portion flows onto the bottom surface portion through the side surface portion in a state where the vehicle body is inclined.   The internal combustion engine according to any one of claims 1 to 5, wherein the valve mechanism includes a camshaft having a plurality of cams, and the oil reservoir is provided above each of the cams. The lubrication mechanism of the engine. The motorcycle includes a stand that maintains a self-supporting state in which the vehicle body is inclined,
The oil reservoir part stores oil in the self-standing state by the stand, and supplies the stored oil toward the valve mechanism when the vehicle body is brought close to an upright state from the self-standing state. The lubrication mechanism of the internal combustion engine according to claim 1.

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