JP2015121120A - Oil chiller of power unit for saddle ride type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil chiller of a power unit for a saddle ride type vehicle capable of cooling circling oil without any special device and with a simple structure.SOLUTION: An oil chiller 50 comprises cover members 42 on right and left sides of an internal combustion engine 20 mounted on a saddle ride type vehicle, and provided in any one of the cover members 42 of the internal combustion engine 20, in which a swollen part 45 is formed on a lateral face of the cover member 42 to swell toward the outside of a vehicle body. A front lateral face 45a of the swollen part 45 is formed to have a regressing shape toward a vehicle body rear side as proceeding from a vehicle body right/left central portion toward a vehicle body lateral side, and a plurality of radiation fins 46 are arranged on the front lateral face 45a along the vertical direction of the vehicle body at intervals to direct the horizontal direction on the vehicle body front side. Within the swollen part 45 where the radiation fins 46 are positioned, an oil cooling passage 55 is formed.

Description

  The present invention relates to an oil cooling device for a power unit for a saddle-ride type vehicle such as a motorcycle.

  Japanese Patent Application Laid-Open No. 2004-228561 discloses a saddle-ride type vehicle in which an oil cooler is provided on the front surface of an internal combustion engine.

JP 2013-015121 A

  In the internal combustion engine (10) (hereinafter, the description of the problem to be solved by the invention is given the reference numeral described in Patent Document 1), the vehicle of the case cover (33) protruding from the cylinder block (13) to the right side of the vehicle. The oil cooler body (46) is brought into contact with the position where the front wall portion (33a) is located, penetrates the oil cooler body (46) from the front of the vehicle, and the front wall of the case cover (33) of the internal combustion engine (10). The oil cooler main body (46) is integrally attached to the front wall (33a) of the case cover (33) by bolts that are screwed into the bolt insertion holes (46a) of the portion (33a), and is attached to the oil cooler main body (46). A plurality of radiating fins (47) oriented in the vehicle width direction and in the vehicle width direction are projected in parallel in the vertical direction, and the front wall portion (33a) of the case cover (33) in the oil cooler body (46) ) Has a curved groove-shaped oil passage (48) formed on the surface that contacts the Oil flowing in the oil passage (48) is adapted to be cooled by the traveling wind which contacts the front of the vehicle to the heat radiating fins (47).

  In addition, the traveling wind heat exchanged from the front of the vehicle in contact with the radiating fins (47) collides with the front of the oil cooler (46) and changes the direction to the right of the vehicle at a substantially right angle, to the right of the leg shield (27). To flow.

  In this way, when the traveling wind that has flowed into the oil cooler (46) from the front of the vehicle collides with the front surface of the oil cooler (46) and changes direction at a substantially right angle, the traveling wind is disturbed, and the traveling wind is smooth. It may be difficult to flow.

  An object of the present invention is to provide an oil cooling device for a power unit for a saddle-ride type vehicle that can solve such problems and improve the cooling performance of the oil cooler.

  According to a first aspect of the present invention, there is provided an oil cooling device provided with a cover member on either side of an internal combustion engine mounted on a saddle-ride type vehicle, and provided on any one cover member of the internal combustion engine. A bulge portion that bulges outward from the vehicle body is formed on the side surface, and a front side surface of the bulge portion is formed in a shape that recedes toward the rear of the vehicle body as it proceeds from the left and right central portion of the vehicle body to the side of the vehicle body. A plurality of the radiating fins are arranged on the side surface in the horizontal direction in front of the vehicle body and spaced apart from each other in the vertical direction of the vehicle body, and an oil cooling oil passage is formed in the bulging portion where the radiating fins are located. An oil cooling device for an internal combustion engine for a saddle-ride type vehicle.

  According to a second aspect of the present invention, the oil cooling oil passage constitutes a part of a main oil oil passage that connects a discharge port of an oil pump and branches to a plurality of oil oil passages in the internal combustion engine wall. The oil cooling device for an internal combustion engine for a saddle-ride type vehicle according to claim 1.

  According to a third aspect of the present invention, the oil pump is disposed at a lower portion of a crankshaft provided in the internal combustion engine, an oil passage in the crankshaft is formed inside the crankshaft, and the oil pump is connected to the bulging portion. An oil filter is provided at a shaft end portion of the crankshaft on the side directed, and an oil filter oil passage branched from the branch portion and connected to the oil filter is formed in the cover member, and the oil pump 3. The oil cooling device for a saddle-ride type vehicle internal combustion engine according to claim 2, wherein the oil discharged from the engine is supplied to the oil filter via the oil filter oil passage.

  The invention according to claim 4 is characterized in that an oil level gauge mounting hole is provided in the upper part of the heat dissipating fin, and the internal combustion engine for saddle riding type vehicles according to any one of claims 1 to 3. Oil cooling device.

  The invention according to claim 5 is characterized in that the radiating fins are located on the rear side of the vehicle body and on the outer side of the vehicle body with respect to the exhaust pipe and the vehicle body frame located in front of the vehicle body. An oil cooling device for an internal combustion engine for a saddle-ride type vehicle according to claim 1.

According to the first aspect of the present invention, the front side surface of the bulging portion formed on the side surface of the cover member is inclined so as to recede toward the rear of the vehicle body from the left and right central portion of the vehicle body to the side of the vehicle body. Since the plurality of radiating fins are arranged on the front side surface of the bulging portion in the front horizontal direction and spaced apart in the vertical direction, the traveling wind flows along the surface of the bulging portion. Passing between the heat dissipating fins, the traveling wind can flow smoothly without causing turbulence.
In addition, since the oil cooling oil passage is formed in the bulging portion where the radiation fins are located, the oil is effectively cooled through the oil cooling oil passage, and there is no need to separately provide an oil cooler. Can be cooled sufficiently.

  According to the invention described in claim 2, since the oil cooling oil passage constitutes a part of the main oil oil passage before branching, the oil branching to each branch passage can be efficiently cooled at a time. .

  According to the invention described in claim 3, the cover member close to the oil filter is provided with a part of the main oil oil passage including the oil cooling oil passage and the oil filter oil passage connected to the oil filter, The oil path connected from the oil pump to the oil filter can be shortened, and the structure can be simplified.

  According to the fourth aspect of the present invention, since the oil level gauge is attached to the upper portion of the radiating fin, the front wall surface of the bulging portion and the radiating fin are prevented from colliding with the end of the oil level gauge such as stepping stones. .

  According to the fifth aspect of the present invention, since the radiating fin is located behind the exhaust pipe and the vehicle body frame and on the outer side of the vehicle body, there is no obstacle between the vehicle body frame and the radiating fin, so Running wind is efficiently sent to the fins.

1 is a right side view of a motorcycle equipped with an internal combustion engine according to an embodiment of the present invention. FIG. 2 is an enlarged view of a right side surface of the internal combustion engine shown in FIG. 1. FIG. 2 is a front view of the motorcycle shown in FIG. 1 as viewed from the body frame. 4 is a cross-sectional view of the internal combustion engine according to the embodiment of the present invention taken along line IV-IV in FIG. 2. It is a right view of a right crankcase. It is a right view of a right crankcase cover. It is a left view of a right crankcase cover. It is the VIII-VIII sectional view taken on the line of the right crankcase cover of FIG. It is the IX-IX sectional view taken on the line of the right crankcase cover of FIG. It is the XX sectional view taken on the line of FIG. 7 of the right crankcase cover. It is the figure which permeate | transmitted the oil channel | path provided in the internal combustion engine from the outer surface of the right crankcase cover. It is the XII-XII sectional view taken on the line of FIG.

  A first embodiment of the oil cooling device 50 for the internal combustion engine 20 used in the saddle-ride type vehicle according to the present invention shown in FIGS. 1 to 12 will be described below.

  In the motorcycle 0 that is a saddle-ride type vehicle shown in FIG. 1, the front-rear, left-right, and up-and-down directions are straight forward directions of the motorcycle 0 forward, left, right and up, and down directions are left, right and Up and down.

  As shown in FIGS. 1 and 2, the body frame 1 of the motorcycle 0 is bent downward after a main frame 3 extending rearward from the head pipe 2 in the center in the vehicle width direction is inclined slightly downward. As a result, the main steeply inclined portion 3a is formed, and the down frame 4 extends from the lower portion of the head pipe 2 toward the lower rear side in the vehicle width direction center.

  A pair of left and right seat rails 5 extends rearward from the bent portion of the main frame 3 while forming a bent portion on the way, and a back stay 6 connecting the bent portion of the seat rail 5 and the central portion of the main steeply inclined portion 3a. The seat rail 5 is supported.

  A front fork 7 is pivotally supported on the head pipe 2 so as to be slidable to the left and right. A front wheel 9 is pivotally supported at the lower end thereof, and a steering handle 8 for steering is integrally coupled to the upper end thereof. ing. A rear fork 11 having a front end supported by a pivot shaft 10 provided at a lower portion of the main frame 3 so as to tilt up and down is extended rearward, and a rear wheel 12 is rotatably supported at the rear end. A rear cushion 13 is interposed between the central portion of the rear fork 11 and the central portion of the backstay 6.

  A fuel tank 14 is installed on the main frame 3 so as to straddle left and right, and a seat 15 is supported by a seat rail 5 behind the fuel tank 14.

  In the internal combustion engine 20, the rear part of the crankcase 21 is attached to the mounting bracket 16 at the lower part of the main steeply inclined part 3a by two bolts 17 at the upper and lower parts, and the front part of the crankcase 21 is attached to the lower end part of the down frame 4 The internal combustion engine 20 is supported by the vehicle body frame 1 by being attached to the attached mounting bracket 18 by bolts 19 at two places on the upper and lower sides.

  An internal combustion engine 20 that is a power unit of the motorcycle 0 has a cylinder block 22, a cylinder head 23, and a cylinder head cover 24 that are stacked on the crankcase 21 with a slight forward inclination in order. This is a SOHC type single-cylinder four-stroke cycle internal combustion engine that is integrally coupled with four stud bolts (not shown) that penetrate vertically.

  An intake pipe 25 is connected to the rear of the cylinder head 23, and the intake pipe 25 is located in a space surrounded by the main frame 3, the seat rail 5, and the backstay 6 in a side view through a carburetor 26. Connected to 27.

  As shown in FIGS. 1 and 3, the exhaust pipe 28 extending forward from the cylinder head 23 is bent downward, and further bent rearward to approach the rear and right sides along the lower surface of the crankcase 21. The muffler 29 is connected to the right side of the rear wheel 12.

  As shown in FIG. 4, the crankcase 21 includes a left crankcase 40 and a right crankcase 41 that are divided into left and right by a plane passing through the center of the cylinder block 22 and parallel to the front-rear direction. The cylinder sleeve 22a of the cylinder block 22 is inserted into the opening formed in the upper part of the left and right crankcases 40, 41.

  The left and right crankcases 40 and 41 are respectively provided with left and right bearing walls 40a and 41a and left and right outer peripheral walls 40b and 41b extending outside the periphery of the left and right bearing walls 40a and 41a. The left storage chamber 21a is formed, and the right bearing chamber 21b is formed by the right bearing wall 41a and the right crankcase cover 44.

  The left and right bearing walls 40a and 41a of the left and right crankcases 40 and 41 are rotatably supported by a crankshaft 30 oriented in the vehicle width direction at the front portion via a pair of left and right crankshaft bearings 30a. A main shaft 38 and a counter shaft 39 that are oriented in the vehicle width direction, which are transmission gear shafts of a transmission (not shown), are rotatably supported at the rear portion (see FIG. 5).

  The piston 31 slidably fitted in the cylinder hole 22b of the cylinder block and the crankshaft 30 pivotally supported by the crankcase 21 are connected via a connecting rod 32 and interlocked with the vertical movement of the piston 31. The crankshaft 30 is rotated.

  A combustion chamber 33 is formed by the lower space of the cylinder head 23 and the upper surface of the piston. An intake port (not shown) extends behind the combustion chamber 33, and an exhaust port (not shown) extends before the combustion chamber 33. An ignition plug 34 is attached to the ceiling wall of the combustion chamber 33 so that the tip faces the combustion chamber 33.

  The cylinder head 23 is provided with a valve operating mechanism 36 that is rotationally driven via a crankshaft 30 and a chain sprocket mechanism 35, and the intake air filtered by the air cleaner 27 is sent by the carburetor 26 in the intake pipe 24. The fuel-air mixture is mixed with fuel, and the air-fuel mixture flows into the combustion chamber 33 at a required timing by the valve mechanism 36. The air-fuel mixture is ignited by the spark plug 34, and the internal combustion engine 20 enters an operating state.

  The main shaft 38 and the counter shaft 39 are provided with a plurality of transmission gears (not shown) to form a gear transmission (not shown), and are integrally provided at the left end of the counter shaft 39 as shown in FIG. The drive sprocket 72 and the driven sprocket 73 provided integrally with the left end of the rear wheel 12 are spanned over the endless chain 74. The rear wheel 12 is rotationally driven through the vias.

  As shown in FIG. 5, an oil pump 51 is provided on the right bearing wall 41a of the right crankcase 41 below the crankshaft 30 in the right housing chamber 21b.

  As shown in FIGS. 4, 5, and 12, the oil pump 51 includes an internal tooth 51 a having a gently curved curved surface at the tip and bottom of the tooth, and an external tooth having a number of teeth one more than the number of teeth. 51b and they are configured to mesh with each other. The internal gear 51a is integrally fitted to the pump shaft 51c, and the pump driven gear 51d fitted to the pump shaft 51c is integrated with the oil pump drive gear 30b fitted to the crankshaft 30 through key coupling. When meshed (see FIG. 11) and the crankshaft 30 rotates, the internal teeth 51a and the external teeth 51b are connected via the oil pump drive gear 30b of the crankshaft 30, the pump driven gear 51d of the oil pump and the pump shaft 51c. It is designed to rotate.

  As shown in FIGS. 4, 5, and 11, an oil reservoir 47 is formed below the right crankcase 41, and the oil reservoir 47 is connected to an oil pump 51 via an oil strainer 48 and an oil intake oil passage 49. Connected to the intake port 51e.

  The oil suction oil passage 49 is formed in a straight line from the bottom of the oil reservoir 47 of the right crankcase 41 to the intake port 51e, slightly diagonally upward and forward, and the lower opening 49a of the oil reservoir 47 is liquid-tight by a plug 49b. It is formed by being fitted to.

  As shown in FIGS. 5, 11, and 12, the discharge port 51 f of the oil pump 51 is connected to a discharge oil passage 53 formed in the right crankcase 41 through a discharge port 52.

  As shown in FIG. 5, the discharge oil passage 53 is formed in a straight line from the bottom of the right crankcase 41 slightly diagonally rearward, and a plug 53b is fitted into an opening 53a provided in the bottom. It is formed.

  From the lower end portion of the discharge oil passage 53, a left connection oil passage 54a extends toward the right side of the right crankcase 41. The left connecting oil passage 54a is formed integrally with the right crankcase 41 when the right crankcase 41 is molded.

  A left branch recess 57a is formed in the upper front of the mating surface 41c of the right crankcase 41. Further, a valve-operating oil passage communication hole 58 is formed in the upper center of the mating surface 41c to a valve-operating oil passage 59 that is formed in a straight line in the upper surface of the right crankcase 41 from above to below. It is provided so that it may communicate.

  Further, an oil passage forming groove 60 extending rearward is formed in the mating surface 41c from the valve operating oil passage communication hole 58, and the tip of the oil passage forming groove 60 is connected to the left crankcase 40 and is not shown in the drawing. It communicates with the rear communication hole 60a leading to the road. The oil passage forming groove 60 is combined with the mating surface 44c of the right crankcase cover 44 that contacts the right crankcase 41, whereby a rear communication oil passage 71 as shown in FIG. 11 is formed.

  As shown in FIGS. 4 and 6, the outer surface 44b of the right crankcase cover 44 is formed with a bulging portion 45 that bulges in a substantially tapered truncated cone shape from the base end portion toward the outer end portion. . As shown in FIG. 8, the front side surface 45a of the bulging portion 45 is formed so as to be inclined so as to recede toward the rear of the vehicle body as it proceeds from the left and right center of the vehicle body to the side of the vehicle body. It is a substantially triangular thick part having a hypotenuse.

  As shown in FIG. 6, on the front side surface 45a of the bulging portion 45, a plurality of radiating fins 46 oriented in the front horizontal direction are arranged at regular intervals in the vertical direction. The radiating fins 46 are arranged so as to connect the front side surface 45a of the bulging portion 45 and the outer side surface 44b of the right crankcase cover 44, and the outer edge thereof is shaped so as to follow the surface of the front side edge 45a. Formed (see FIG. 8).

  As shown in FIG. 3, the bulging portion 45 and the radiating fin 46 are located on the rear side of the vehicle body and on the outer side of the vehicle body with respect to the position of the down frame 4 and the exhaust pipe 28 positioned in the foremost position in the vehicle body frame 1 when viewed from the front of the vehicle. It is located so that it may protrude slightly to the right side. For this reason, during traveling, the oil cooling oil passage 55 formed inside the front side surface 45a that is in contact with the radiating fin 46 is not disturbed by the down frame 4 or the exhaust pipe 27 and the traveling wind hits the radiating fin 46. With 46, heat exchange can be performed efficiently, and a good cooling effect can be obtained.

  As shown in FIGS. 7 and 9, the right connection oil passage 54 b is positioned on the inner side surface 44 a of the right crankcase cover 44 at a position where it can be flush with the left connection oil passage 54 a of the right crankcase 41. Thus, it is formed so as to face the outer surface of the right crankcase cover 44.

  As shown in FIG. 9, the right connecting oil passage 54 b is formed integrally with the right crankcase cover 44 when the right crankcase cover 44 is formed, and the mating surface 41 c of the right crankcase 41 and the right crankcase cover 44 are formed. Are joined to the left connecting oil passage 54a, and the left and right connecting oil passages 54a and 54b form the connecting oil passage 54. The right communication oil passage 54b is formed integrally with the right crankcase cover 44 when the right crankcase cover 44 is formed.

  As shown in FIGS. 6, 7, and 9, an oil cooling oil passage 55 is provided in the front wall surface 45 a of the bulging portion 45, and a lower side surface 45 c of the bulging portion 45 adjacent to the base portion of the radiating fin 46. The oil cooling oil passage 55 is formed in such a manner that the lower end portion 55a of the oil cooling oil passage 55 is liquid-tightly fitted with a plug 55b.

  As shown in FIG. 7, a part of the front left upper portion of the right crankcase cover 44 in the mating surface 44c of the right crankcase cover 44 is opposed to the left branch recess 57a formed in the upper front of the mating surface 41c of the right crankcase 41. The right branch recess 57b is formed so as to be oriented slightly rearward. Accordingly, the mating surface 41c of the right crankcase 41 and the mating surface 44c of the right crankcase cover 44 are combined to form a branch portion 57 as shown in FIG.

  As shown in FIGS. 7 and 9, an upper oil passage 56 is formed in a straight line from the front end of the right branch recess 57 b to the upper end of the oil cooling oil passage 55 diagonally downward to the right. Communicates with Road 55. Accordingly, as shown in FIG. 9, the right communication oil passage 54b, the oil cooling oil passage 55, and the upper oil passage 56 are communicated in this order inside the right crankcase cover 41, and the discharge port of the right crankcase 41 is connected. 52, a main oil oil passage 70 having no branch passage is formed in combination with the discharge oil passage 53 and the left communication passage 55.

  As shown in FIGS. 7 and 10, an upper oil filter oil passage 61a is formed in a straight line from the middle of the right branch recess 57b to the lower right.

  An oil filter bearing 62 is provided on the axis of the crankshaft 30 on the inner side surface 44a of the right crankcase cover 44 (see FIG. 4). The oil filter bearing 62 has a lower oil filter oil passage 61c. Is drilled linearly from the inner side surface 44a to the right.

  Further, from the lower side surface 45c of the bulging portion 45, the middle oil filter oil passage 61b passes through the right end portion of the lower oil filter oil passage 61c and obliquely forwards upward to the lower end portion of the upper oil filter oil passage 61b. The lower end 61d is formed in a liquid-tight manner by a stopper 61e.

  The upper oil filter oil passage 61a, the middle oil filter oil passage 61b, and the lower oil filter oil passage 61c constitute an oil filter oil passage 61.

  As shown in FIG. 6, an oil level gauge mounting hole 63 a for attaching the oil level gauge 63 is provided on the upper side surface 45 b of the bulging portion 45 located at the upper portion of the heat radiation fin 46. By attaching the oil level gauge 63 to this position, it is possible to avoid the collision of the stepping stones with the oil level gauge 63 by the radiating fins 46 provided at the bulging portion 45 and the front lower portion of the oil level gauge 63.

  FIG. 11 illustrates the oil path through the right bearing wall 44a of the right crankcase 41 and the right crankcase cover 44 from the outer surface 44b side of the right crankcase cover 44. The foreign matter in the oil accumulated in the oil reservoir 47 formed at the lower part of the crankcase 21 is removed through the oil strainer 48, and then the oil passes through the oil intake oil passage 49 and the intake port of the oil pump 51. Inhaled into 51e. The oil sucked into the suction port 51e is sent to the discharge port 51f provided in the right crankcase 21a by the rotational drive of the oil pump 51 described above.

  As shown in FIGS. 11 and 12, the oil sent to the discharge port 51 f passes through the discharge oil passage 53 extending obliquely forward and downward through the discharge port 52, and passes through the connection oil passage 54 to the right crankcase. It is sent to the cover 44 and sent to the oil cooling oil passage 55 directed upward in the right crankcase cover 44.

In the oil cooling oil passage 55, heat is efficiently exchanged with the traveling wind by the radiating fins 46, whereby the internal oil is cooled.
The oil cooled in the oil cooling oil passage 55 is sent from the oil cooling oil passage 55 to the branching portion 57 through an upper oil passage 56 that extends linearly to the upper left and slightly rearward.

  As shown in FIG. 11, the branching portion 57 is slightly obliquely rearward by combining a right branching recess 57b and a left branching recess 57a provided above the right crankcase 41 and the right crankcase cover 44, respectively. A plurality of oil passages (an oil cooling oil passage 55, a valve operating oil passage 59, an oil filter oil passage 61, and a rear communication oil passage 71) communicate with each other.

  An upper oil filter oil passage 61a that branches from an intermediate stage of the branch portion 57 to an oil filter oil passage 61 formed facing the oil filter bearing portion 62 is connected, and the oil filter oil passage 61 is an end portion of the right shaft of the crankshaft 30. It is connected to an oil filter 37 attached to.

  The oil filter 37 is a centrifugal filter coupled to the right shaft end portion of the crankshaft 30 directed to the bulging portion 45, and the right filter shaft 37a is an oil provided on the inner surface 44a of the right crankcase cover 44. The filter bearing 62 is fitted.

  As shown in FIG. 4, a filter shaft oil passage 37 b connected to the oil filter oil passage 61 is provided inside the filter shaft 37 a, and the filter shaft oil passage 37 b is connected to the right shaft end of the crankshaft 30. It is connected to an oil passage 30c in the crankshaft shaft that opens to the part. Foreign matter in the oil supplied into the oil filter 37 is collected on the outer periphery of the oil filter 37 by radial fins 37c oriented in the radial direction rotating at high speed, and only clean oil is supplied to the lubrication part of the crankshaft 30. The Thus, the oil supplied from the crankshaft 30 to the other lubrication system finally returns to the oil reservoir 47 provided at the lower part of the crankcase 21 and is circulated to the oil pump 51 via the oil strainer 48. The

  As shown in FIG. 11, a valve system oil passage communication hole 58 communicating with the cylinder block 22 is formed in the right crankcase 41 at the upper stage of the branch portion 57, and the valve system oil passage communication hole 58 The valve operating oil passage 59 provided in the right crankcase 41 extends upward from the crankcase 21, and oil is supplied to the valve operating mechanism 36 through an oil passage (not shown) formed in the cylinder block 22. The valve mechanism 36 is cooled by oil, and the sliding contact portion is lubricated.

  Further, a rear communication oil passage 71 is connected to the rear from a valve operating oil passage communication hole 58 provided in the upper stage of the branching portion 57, and a tip thereof communicates with the rear communication hole 60a.

  Since the rear communication hole 60a is connected to the shaft support portions of the main shaft 38 and the counter shaft 39 of the transmission (not shown), the main shaft 38 and the counter shaft 39 can be smoothly rotated by the supplied oil. .

Thus, the present embodiment has the following effects.
(1) The traveling wind with respect to the moving motorcycle 0 is not interrupted by the down frame 4, the mounting bracket 18 and the exhaust pipe 28, and is horizontal at regular intervals over the front side surface 45 a of the inclined bulging portion 45. It is possible to smoothly flow between the large number of heat dissipating fins 46 that are oriented toward the center without causing any disturbance.
(2) Since the oil cooling oil passage 55 is formed in the bulging portion 45 where the radiation fins 46 are located, the oil is effectively cooled through the oil cooling oil passage 55, and there is no need to provide a separate oil cooler. The oil can be sufficiently cooled with a simple structure.
(3) Since the oil cooling oil passage 55 is a part of the main oil oil passage 70 before branching, the oil branching to each branch passage 59, 61, 71 can be efficiently cooled at a time.
(4) The cover member 42 close to the oil filter 37 is provided with a part of the main oil oil passage 70 including the oil cooling oil passage 55 and an oil filter oil passage 61 connected to the oil filter 37, and the oil pump The oil passage connected from 51 to the oil filter 37 can be shortened, and the structure can be simplified.
(5) Since the oil level gauge 63 is attached to the upper portion of the radiating fin 46, the front wall surface 45a of the bulging portion 45 and the radiating fin 46 prevent collision of flying stones and the like with the oil level gauge 63 end.
(6) Since the radiating fin is located behind the vehicle body and outside the vehicle body with respect to the exhaust pipe and the vehicle body frame, there is no obstacle between the vehicle body frame and the radiating fin, and traveling wind is efficiently sent to the radiating fin. It is done.
(7) Since the traveling wind that has passed between the mounting bracket 18 and the exhaust pipe 28 can flow to the right of the vehicle body and pass between the heat radiating fins 46, the oil can be sufficiently cooled in combination with the above effects.

DESCRIPTION OF SYMBOLS 0 ... Motorcycle, 1 ... Body frame, 2 ... Head pipe, 3 ... Main frame, 3a ... Main steep slope part, 4 ... Down frame, 5 ... Seat rail, 6 ... Back stay, 7 ... Front fork, 8 ... Steering Handle, 9 ... Front wheel, 10 ... Pivot shaft, 11 ... Rear fork, 12 ... Rear wheel, 13 ... Rear cushion, 14 ... Fuel tank, 15 ... Seat, 16 ... Mounting bracket, 17 ... Bolt, 18 ... Mounting bracket, 19 ... Bolt, 20 ... Internal combustion engine, 21 ... Crankcase, 21a ... Left side chamber, 21b ... Right side chamber, 22 ... Cylinder block, 22a ... Cylinder sleeve, 22b ... Cylinder hole, 23 ... Cylinder head, 24 ... Cylinder head cover, 25 ... Intake pipe, 26 ... Carburetor, 27 ... Air cleaner, 28 ... Exhaust pipe, 29 ... Silencer, 30 ... Crankshaft, 30a ... Crankshaft bearing, 30b ... Oil pump drive gear, 30c Oil passage in crankshaft, 31 ... piston, 32 ... connecting rod, 33 ... combustion chamber, 34 ... ignition plug, 35 ... chain sprocket mechanism, 36 ... valve mechanism, 37 ... oil filter, 37a ... filter shaft, 37b ... filter shaft Inner oil passage, 37c ... radial fin, 38 ... main shaft, 39 ... counter shaft, 40 ... left crankcase, 40a ... left bearing wall, 40b ... left outer peripheral wall, 41 ... right crankcase, 41a ... right bearing wall, 41b ... right outer peripheral wall, 42 cover member, 43 ... left crankcase cover, 44 ... right crankcase cover, 44a ... inner side surface, 44b ... outer side surface, 44c ... mating surface, 45 ... bulge, 45a ... front side surface, 45b ... Upper side, 45c ... Lower side, 46 ... Radiation fins, 47 ... Oil reservoir, 48 ... Oil strainer, 49 ... Oil intake oil passage, 49a ... Opening, 49b ... Plug, 50 ... Oil cooling device, 51 ... Oil pump 51a ... Internal teeth, 51b ... External teeth, 51c ... Pump shaft, 51d ... Pump driven gear , 51e ... suction port, 51f ... discharge port, 52 ... discharge port, 53 ... discharge oil passage, 53a ... opening, 53b ... plug, 54 ... connection oil passage, 54a ... left connection oil passage, 54b ... right connection oil passage 55 ... oil cooling oil passage, 55a ... lower end portion, 55b ... plug, 56 ... upper oil passage, 57 ... branch portion, 57a ... right branch recess, 57b ... left branch recess, 58 ... valve system oil passage connection hole, 59 ... Valve system oil passage, 60 ... Oil passage formation groove, 60a ... Rear connection hole, 61 ... Oil filter oil passage, 61a ... Upper oil filter oil passage, 61b ... Middle oil filter oil passage, 61c ... Lower oil filter oil Road, 61d ... Bottom end, 61e ... Plug, 62 ... Oil filter bearing, 63 ... Oil level gauge, 63a ... Oil level gauge mounting hole, 70 ... Main oil oil passage, 71 ... Rear connection oil passage, 72 ... Drive sprocket , 73 ... Driven sprocket, 74 ... Endless chain

Claims (5)

The internal combustion engine (20) mounted on the saddle-ride type vehicle is provided with cover members (42) on the left and right sides, and an oil cooling device (50) provided on any one of the cover members (42) of the internal combustion engine (20). )
A bulging portion (45) bulging outward of the vehicle body is formed on the side surface of the cover member (42),
The front side surface (45a) of the bulging portion (45) is formed in a shape that recedes toward the rear of the vehicle body from the left and right central portion of the vehicle body to the side of the vehicle body. (46) is oriented in the horizontal direction in front of the vehicle body and arranged at intervals in the vertical direction of the vehicle body,
An oil cooling device (50) for an internal combustion engine (20) for a saddle-ride type vehicle, wherein an oil cooling oil passage (55) is formed in a bulging portion (45) where the heat dissipating fin (46) is located. .   The oil cooling oil passage (55) is a branch portion (57) to a discharge port (52) of an oil pump (51) and a plurality of oil oil passages (59, 61, 71) in the wall of the internal combustion engine (20). The oil cooling device (50) of the internal combustion engine (20) for a saddle-ride type vehicle according to claim 1, wherein a part of a main oil oil passage (70) is connected to the internal combustion engine (20). The oil pump (51) is disposed at a lower part of a crankshaft (30) provided in the internal combustion engine (20),
In the crankshaft (30), an oil passage (30c) in the crankshaft is formed,
An oil filter (37) is provided at the shaft end of the crankshaft (30) on the side facing the bulging portion (45),
The cover member (42) is formed with an oil filter oil passage (61) branched from the branch portion (57) and connected to the oil filter (37).
The saddle riding type vehicle according to claim 2, wherein oil discharged from the oil pump (51) is supplied to the oil filter (37) through the oil filter oil passage (61). Oil cooling device (50) for internal combustion engine (20).   The internal combustion engine (20) for a saddle-ride type vehicle according to any one of claims 1 to 3, wherein an oil level gauge mounting hole (63a) is provided in an upper portion of the radiating fin (46). ) Oil cooling device (50).   The heat radiating fins (46) are located on the rear side of the vehicle body and on the outer side of the vehicle body with respect to the exhaust pipe (28) and the vehicle body frame (1) positioned in front of the vehicle body. The oil cooling device (50) for the internal combustion engine (20) for a saddle-ride type vehicle according to any one of the preceding claims.

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