JP2016121553A - Engine and saddle-riding type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine capable of supplying oil from one end surface of a crank shaft into the inside of the crank shaft without increasing the number of component elements and cost and provide a saddle-riding type vehicle including the same.SOLUTION: One end surface 222e at one end of a crank shaft 222 faces a cover member 224. An axial flow passage 255 is formed inside the crank shaft 222. The axial flow passage 255 has an end opening 222h at an end surface 222e of the crank shaft 222. A pin flow passage 256 is formed inside the pin member 223. A cover flow passage 257 is formed inside the cover member 224. Oil stored in an oil pan 230 is guided to an oil gallery 251. Oil from the oil gallery 251 is guided to a pin flow passage 256. Oil from the pin flow passage 256 is guided to the cover flow passage 257. Oil from the cover flow passage 257 is guided to an end opening 222h of the crank shaft 222.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an engine and a saddle-ride type vehicle.

  In a vehicle engine such as a motorcycle, a crank journal of a crankshaft is rotatably supported by a crankcase by a bearing. In addition, the crank pin of the crankshaft is connected to the large end of the connecting rod via a bearing. In order to lubricate these bearings, oil stored in the oil pan is supplied to the crankshaft (see, for example, Patent Document 1).

  Patent Document 1 describes a center oil supply type crankshaft. The center oil supply type crankshaft has a supply oil passage inside thereof. An oil introduction hole is formed on the outer peripheral surface in the vicinity of one end of the crankshaft. Oil introduced into the crankshaft from the oil introduction hole is supplied to the crank journal and the crankpin through the supply oil passage. A journal distribution oil passage for supplying oil from the supply oil passage to the bearing is formed in the crank journal. A pin distribution oil passage for supplying oil from the supply oil passage to the bearing is formed in the crankpin.

JP 2009-204001 A

  When the oil is introduced into the crankshaft from the outer peripheral surface of the crankshaft as in the center oil supply type crankshaft of Patent Document 1, the centrifugal force due to the rotation of the crankshaft is applied to the oil introduced into the oil introduction hole of the crankshaft. Works. Therefore, it is necessary to supply oil at a high pressure. On the other hand, when oil is introduced into the crankshaft from the end face of the crankshaft, it is not necessary to supply the oil at a high pressure. However, if the engine is configured to introduce oil into the crankshaft from the end face of the crankshaft, the number of parts increases and the cost increases.

  An object of the present invention is to provide an engine that can supply oil from the end face of the crankshaft to the inside of the crankshaft without increasing the number of parts and cost, and a saddle-ride type vehicle equipped with the engine.

  (1) An engine according to a first aspect of the present invention includes a crankcase having a side wall portion in which an opening is formed, a crankshaft supported by the crankcase, and an oil pan that is disposed below the crankcase and stores oil. A chain member that is connected to one end of the crankshaft and transmits the rotational force of the crankshaft to the valve mechanism, a pin member that is fixed to the crankcase and applies tension to the chain member, and closes the opening. A cover member attached to the side wall portion of the crankcase and a first flow path (for example, oil gallery 251 in FIG. 6) through which oil stored in the oil pan is guided, and an end surface of one end portion of the crankshaft is a cover member An axial flow path having an end opening on the end face is formed inside the crankshaft, and oil from the first flow path is guided into the pin member. Emissions flow path is formed, inside the cover member, the cover flow path for guiding the oil from the pin channel in the end opening of the crankshaft is formed.

  In this engine, a chain member is connected to one end of a crankshaft supported by the crankcase, and a pin member is fixed to the crankcase. Tension is applied to the chain member from the damper held by the pin member, and the rotational force of the crankshaft is transmitted to the valve operating mechanism by the chain member. A cover member is attached to the side wall of the crankcase so as to close the opening. An end surface of one end of the crankshaft faces the cover member.

  An axial flow path is formed inside the crankshaft. The axial flow path has an end opening on the end face of the crankshaft. A pin channel is formed inside the pin member. A cover channel is formed inside the cover member. Oil stored in the oil pan is guided to the first flow path. Oil from the first channel is guided to the pin channel. Oil from the pin channel is guided to the cover channel. Oil from the cover channel is guided to the end opening of the crankshaft.

  According to this configuration, the pin channel inside the pin member and the cover channel of the cover member are used as a route for supplying oil from the end opening of the end surface of the crankshaft to the shaft channel inside the crankshaft. It is done. Therefore, there is no need to provide additional parts for supplying oil. Further, the pin channel can be formed in the pin member and the cover channel can be formed in the cover member by simple processing. As a result, oil can be supplied to the inside of the crankshaft from the end face of the crankshaft without increasing the number of parts and cost.

  (2) The crankshaft has a crank journal and a crankpin, and the engine has a connecting rod connected to the crankpin, and a first bearing provided between the crankpin and the connecting rod (for example, the bearing 226 in FIG. 6). And the shaft channel is formed so as to extend into the crank journal and the crank pin, and the crank pin supplies the first bearing with oil from the shaft channel to the first bearing. You may have a hole.

  In this case, oil from the shaft flow path of the crankshaft is supplied to the first bearing through the first oil supply hole of the crankpin. As a result, the first bearing can be lubricated with a simple configuration.

  (3) The engine has a second bearing (for example, bearing 225 in FIG. 6) provided between the crank journal and the crankcase, and a second flow path (for example, FIG. 6) through which oil stored in the oil pan is guided. And an oil gallery 252) and a third channel (for example, a bearing channel 253 in FIG. 6) for supplying oil from the second channel to the second bearing.

  In this case, the oil stored in the oil pan is guided to the second flow path. Oil from the second channel is supplied to the second bearing through the third channel. The path of oil supplied to the first bearing is different from the path of oil supplied to the second bearing. Therefore, the pressure of the oil supplied to the first bearing and the pressure of the oil supplied to the second bearing can be adjusted separately. Therefore, the first and second bearings can be lubricated with oil having appropriate pressures.

  (4) The first flow path may be disposed above the crankshaft, and the second flow path may be disposed below the crankshaft.

  In this case, since the second flow path disposed below the crankshaft does not need to guide oil to the cover member, the length of the second flow path can be shortened in the direction in which the crankshaft extends. Therefore, when the engine is provided in a saddle-ride type vehicle, the lower portion of the saddle-ride type vehicle is prevented from protruding in the left-right direction. This prevents the bank angle of the saddle-ride type vehicle from being limited.

  (5) The engine further includes a second bearing provided between the crank journal and the crankcase, and the crank journal has a second oil supply hole for supplying oil from the shaft passage to the second bearing. You may have.

  In this case, oil from the shaft passage of the crankshaft is supplied to the second bearing through the second oil supply hole of the crank journal. Thus, the second bearing can be lubricated with a simple configuration.

  (6) The engine includes a piston connected to the connecting rod, and a fourth flow path (for example, the piston flow in FIG. 7) that supplies oil from the first flow path to the piston in a direction parallel to the reciprocating direction of the piston. Path 254).

  In this case, the oil from the first channel is supplied to the piston through the fourth channel. Thereby, a piston can be cooled. In addition, since the oil is supplied in a direction parallel to the reciprocating direction of the piston, the oil can be reliably supplied to the piston when the piston reciprocates. Therefore, the cooling efficiency of the piston can be improved.

  (7) The crankcase may include a lower casing that supports the crankshaft from below and an upper casing that supports the crankshaft from above.

  In this case, the crankshaft is supported from above and below by the lower casing and the crankshaft. Therefore, the first flow path can be easily assembled in the crankcase together with the crankshaft.

  (8) A saddle-ride type vehicle according to a second aspect of the invention is a vehicle main body, the engine according to any one of claims 1 to 7 provided in the vehicle main body, and a drive that rotates by torque generated by the engine. With a ring.

  In this saddle-ride type vehicle, the engine according to the first invention is provided in the vehicle body. The drive wheels are rotated by torque generated by the engine.

  In an engine, a chain member is connected to one end of a crankshaft supported by a crankcase, and a pin member is fixed to the crankcase. The rotational force of the crankshaft is transmitted to the valve operating mechanism by the chain member. A cover member is attached to the side wall of the crankcase so as to close the opening. An end surface of one end of the crankshaft faces the cover member.

  An axial flow path is formed inside the crankshaft. The axial flow path has an end opening on the end face of the crankshaft. A pin channel is formed inside the pin member. A cover channel is formed inside the cover member. Oil stored in the oil pan is guided to the first flow path. Oil from the first channel is guided to the pin channel. Oil from the pin channel is guided to the end opening of the crankshaft.

  According to this configuration, the pin channel inside the pin member and the cover channel of the cover member are used as a route for supplying oil from the end opening of the end surface of the crankshaft to the shaft channel inside the crankshaft. It is done. Therefore, there is no need to provide additional parts for supplying oil. Further, the pin channel can be formed in the pin member and the cover channel can be formed in the cover member by simple processing. As a result, oil can be supplied to the inside of the crankshaft from the end face of the crankshaft without increasing the number of parts and cost.

  According to the present invention, oil can be supplied from the end face of the crankshaft to the inside of the crankshaft without increasing the number of parts and cost.

1 is a side view showing a motorcycle according to an embodiment of the present invention. It is a left view of an engine. It is a perspective view of the crankcase seen from the right front. It is a perspective view of the crankcase seen from the right rear. It is a right view of a crankcase. It is a typical sectional view showing composition of a crankshaft and its circumference. It is a schematic diagram which shows a part of oil supply flow path. It is typical sectional drawing which shows the structure of the crankshaft in other embodiment, and its periphery.

  Hereinafter, a saddle-ride type vehicle according to an embodiment of the present invention will be described with reference to the drawings. In the following description, a motorcycle will be described as an example of a saddle-ride type vehicle.

(1) Schematic Configuration of Motorcycle FIG. 1 is a side view showing a motorcycle according to an embodiment of the present invention. FIG. 1 shows a state where the motorcycle 100 stands upright with respect to the road surface. In FIG. 1, the front-rear direction L, the up-down direction H, and the left-right direction W of the motorcycle 100 are indicated by arrows. In the following description, the direction in which the arrow points in the front-rear direction L is referred to as the front, and the opposite direction is referred to as the rear. In addition, the direction in which the arrow is directed in the vertical direction H is referred to as upward, and the opposite direction is referred to as downward. Furthermore, the direction in which the arrow is directed in the left-right direction W is called left, and the opposite direction is called right.

  As shown in FIG. 1, the motorcycle 100 includes a body frame 10. The body frame 10 includes a pair of main frames 11, a rear frame 12, and a head pipe 13. The pair of main frames 11 extends obliquely downward from the head pipe 13 toward the rear. The rear ends of the pair of main frames 11 are curved downward. The rear frame 12 extends rearward from the upper rear end of the pair of main frames 11.

  A front fork device 20 is attached to the head pipe 13 so as to be rotatable in the left-right direction. The front fork device 20 includes a steering shaft (stem shaft) 21, a pair of fork pipes 22, a handle member 23 and a front wheel 24.

  The steering shaft 21 is inserted into the head pipe 13 so as to extend downward and forward. The pair of fork pipes 22 are respectively arranged on the left side and the right side of the steering shaft 21. The pair of fork pipes 22 are connected to the steering shaft 21 by a plurality of connection members (under bracket and upper bracket) not shown.

  The front wheel 24 is rotatably supported between the lower portions of the pair of fork pipes 22. The handle member 23 includes a pair of handles. The handle member 23 is connected to a pair of fork pipes 22. The front fork device 20 rotates with respect to the head pipe 13 when the handle member 23 is operated.

  The cowl 1 is provided so as to cover the head pipe 13 from the front and the pair of fork pipes 22 from both sides. The cowl 1 is attached to a pair of main frames 11.

  A multi-cylinder engine 200 is provided below the pair of main frames 11. Engine 200 includes a cylinder unit 210, a crank unit 220 and an oil pan 230. The crank unit 220 is located below the cylinder unit 210, and the oil pan 230 is located below the crank unit 220. The cylinder unit 210 is supported by the pair of main frames 11.

  An exhaust device 30 that guides exhaust gas to the outside is connected to the cylinder unit 210. The exhaust device 30 includes a plurality of exhaust pipes 31 and a muffler (silencer) 32. The exhaust pipe 31 is provided so as to extend rearward from the cylinder unit 210 through the side of the oil pan 230.

  The rear end of the exhaust pipe 31 is connected to the muffler 32. The muffler 32 is provided so as to extend to the side of the rear wheel 5 described later. The muffler 32 is provided with a three-way catalyst. The exhaust gas generated by the combustion of the air-fuel mixture in the cylinder unit 210 is sent to the muffler 32 through the exhaust pipe 31 and is discharged to the atmosphere through the muffler 32.

  The fuel tank 2 is supported by the pair of main frames 11 above the engine 200. The seat 3 is supported by the rear frame 12 behind the fuel tank 2. A swing arm 4 is provided so as to extend rearward from the lower end portion of the main frame 11. A rear wheel 5 is rotatably held at the rear end of the swing arm 4. The rear wheel 5 is rotated by the rotational force of the engine 200.

(2) Engine FIG. 2 is a left side view of the engine 200. As described above, engine 200 includes cylinder unit 210, crank unit 220, and oil pan 230. As shown in FIG. 2, a plurality of connecting rods (connecting rods) 201 are provided inside the cylinder unit 210 and the crank unit 220.

  The cylinder unit 210 includes a cylinder head 211 and a cylinder body 212. The outer walls of the cylinder head 211 and the cylinder body 212 are referred to as a cylinder case 210C.

  A combustion chamber V is formed in the cylinder head 211. In the cylinder head 211, an ignition device 213, a plurality of intake valves 214, a plurality of exhaust valves 215, a valve operating mechanism 216, and the like are accommodated. Further, the cylinder head 211 is formed with a plurality of exhaust ports 217 and a plurality of intake ports (not shown).

  The ignition device 213 ignites the air-fuel mixture filled in the combustion chamber V. The plurality of intake valves 214 are provided to be able to open and close the plurality of intake holes of the combustion chamber V, respectively. The plurality of exhaust valves 215 are provided so that the plurality of exhaust holes of the combustion chamber V can be opened and closed, respectively. The valve mechanism 216 includes an intake cam, an exhaust cam, and a camshaft. The plurality of intake valves 214 and the plurality of exhaust valves 215 are opened and closed by a valve operating mechanism 216.

  A plurality of pistons 218 are accommodated in the cylinders of the cylinder body 212, respectively. The small ends 201b of the plurality of connecting rods 201 are connected to the pins of the plurality of pistons 218, respectively. Between the plurality of pistons 218 and the small ends 201b of the plurality of connecting rods 201, a plurality of bearings (not shown) are respectively attached.

  The crank unit 220 includes a crankcase 221, a crankshaft 222, a starter motor (not shown), a generator (not shown), a transmission (not shown), and the like. The crankcase 221 is disposed below the cylinder case 210C. The crankcase 221 in the present embodiment is a vertically divided crankcase. The crankcase 221 includes a lower casing 221a and an upper casing 221b. The crankcase 221 houses a crankshaft 222, a starter motor, a generator, a transmission, and the like.

  The oil pan 230 is disposed below the crankcase 221. Oil is stored in the oil pan 230. An oil pump unit 240 is disposed in the crankcase 221. The oil suction port 242 a of the oil pump unit 240 is located near the bottom of the oil pan 230.

  The oil pump unit 240 sucks oil stored in the oil pan 230 through the oil suction port 242a, and also supplies oil from the oil discharge port to various components (for example, a plurality of bearings 225 and 226 in FIG. 6 described later). Supply. Thereby, lubrication, cooling, rust prevention and the like of various components are performed. Oil supplied to the various components is returned to the oil pan 230. Details of the oil supply channel will be described later.

  FIG. 3 is a perspective view of the crankcase 221 viewed from the right front. FIG. 4 is a perspective view of the crankcase 221 viewed from the right rear. FIG. 5 is a right side view of the crankcase 221. 3 to 5, the front-rear direction L, the up-down direction H, and the left-right direction W are shown with the crankcase 221 provided in the motorcycle 100.

  As shown in FIGS. 3 to 5, an opening 221 </ b> C is formed in the right side wall 221 </ b> R of the crankcase 221. A peripheral wall 221c and a bottom 221d are formed inside the opening 221C. An opening 221D having a smaller diameter than the opening 221C is formed at the bottom 221d of the opening 221C. The openings 221C and 221D are located on the right side wall 221R in the vicinity of the boundary between the lower casing 221a and the upper casing 221b.

  As shown in FIGS. 3 and 5, an insertion hole 221 </ b> E reaching the inside of the opening 221 </ b> C is formed in the upper right portion of the upper casing 221 b. As shown by the dashed line arrow in FIG. 3, the lower part of the chain member 202 is inserted into the insertion hole 221E. In this case, as shown in FIG. 5, the lower part of the chain member 202 is positioned inside the opening 221 </ b> C of the crankcase 221. The lower part of the chain member 202 is connected to one end of the crankshaft 222 in FIG. The upper part of the chain member 202 is connected to the valve operating mechanism 216.

  As shown in FIG. 3, a pin attachment portion 221F is formed on the bottom 221d of the opening 221C. A pin member 223 is attached to the pin attachment portion 221F. In the present embodiment, the pin member 223 is a hollow pin. The pin member 223 holds a damper for applying tension to the chain member 202. As the crankshaft 222 rotates, the rotational force is transmitted to the valve operating mechanism 216 by the chain member 202.

  A cover member 224 is attached to the right side wall 221R of the crankcase 221 so as to close the opening 221C. An end surface 222e (see FIG. 6 described later) at one end of the crankshaft 222 faces the cover member 224.

  FIG. 6 is a schematic cross-sectional view showing the configuration of the crankshaft 222 and its surroundings. As shown in FIG. 6, the crankshaft 222 includes a plurality of crank journals 222a, a plurality of crank webs 222b, and a plurality of crank pins 222c. The plurality of crank journals 222a are supported by the lower casing 221a and the upper casing 221b of FIG. A plurality of bearings 225 are attached between the plurality of crank journals 222a and the lower casing 221a and the upper casing 221b, respectively.

  Each crank web 222b includes a crank arm and a balance weight. The plurality of crank webs 222b are connected to the plurality of crank journals 222a. The plurality of crank pins 222c are attached between adjacent crank webs 222b. The large ends 201a of the plurality of connecting rods 201 are connected to the plurality of crank pins 222c, respectively. A plurality of bearings 226 are attached between the plurality of crank pins 222c and the large ends 201a of the plurality of connecting rods 201, respectively.

  The reciprocating motion of the plurality of pistons 218 is converted into rotational motion by the crankshaft 222. As described above, the rotational movement of the crankshaft 222 is transmitted to the valve mechanism 216 in FIG. 5 through the chain member 202. Further, the rotational movement of the crankshaft 222 is transmitted to the rear wheel 5 in FIG. 1 via a transmission (not shown).

(3) Oil supply flow path Engine 200 is provided with an oil supply flow path for supplying the oil stored in oil pan 230 (see FIG. 2) to various components. FIG. 7 is a schematic diagram showing a part of the oil supply channel. FIG. 7 shows an oil pan 230 and an oil pump unit 240 together with a part of the oil supply channel 250.

  As shown in FIG. 7, the oil pump unit 240 includes a pump main body 241, an upstream pipe 242, a downstream pipe 243, a strainer 244, a relief valve 245, an oil cooler 246, and an oil cleaner 247. The pump body 241 is disposed in the crankcase 221 of FIG. The downstream end of the upstream pipe 242 is connected to the oil inlet of the pump body 241, and the upstream end of the downstream pipe 243 is connected to the oil outlet of the pump body 241.

  An oil suction port 242 a is formed at the upstream end of the upstream pipe 242, and an oil discharge port 243 a is formed at the downstream end of the downstream pipe 243. As described above, the oil suction port 242a is disposed near the bottom of the oil pan 230. The pump main body 241 sucks oil stored in the oil pan 230 through the oil suction port 242a of the upstream pipe 242 and discharges oil from the oil discharge port 243a of the downstream pipe 243 to the oil supply channel 250.

  The strainer 244 is inserted into the upstream pipe 242 in the oil pan 230. The strainer 244 removes relatively large impurities from the oil sucked by the oil suction port 242a.

  The relief valve 245, the oil cooler 246, and the oil cleaner 247 are inserted in the downstream pipe 243. The oil cooler 246 cools the oil in the downstream pipe 243. The oil cooler 246 may be realized by an air cooling method, or may be realized by a method using a cooling medium such as a water cooling method. The oil cleaner 247 removes relatively small impurities from the oil in the downstream pipe 243.

  The oil supply passage 250 includes two oil gallery 251 and 252, a plurality of bearing passages 253, a plurality of piston passages 254, an axial passage 255, a pin passage 256, a cover passage 257 and a connection passage 258. Including. Hereinafter, the oil supply channel 250 will be described with reference to FIGS. In FIG. 4, the oil gallery 251 and 252, the shaft channel 255, the pin channel 256 and the cover channel 257 are indicated by dotted lines, and the plurality of bearing channels 253 and the plurality of piston channels 254 are not shown. .

  As shown in FIGS. 4, 6, and 7, the oil gallery 251 is provided in the upper casing 221 b so as to extend parallel to the crankshaft 222. Oil discharged from the oil discharge port 243a of the oil pump unit 240 in FIG. 7 is guided to the oil gallery 251.

  As shown in FIGS. 4, 6, and 7, the pin channel 256 is formed inside the pin member 223. One end of the oil gallery 251 and the pin channel 256 are connected by a connection channel 258. The oil in the oil gallery 251 is guided to the pin channel 256 through the connection channel 258.

  The cover channel 257 is formed inside the cover member 224. The pin channel 256 in the pin member 223 communicates with the cover channel 257 in the cover member 224. Oil from the pin channel 256 is guided to the cover channel 257.

  As shown in FIGS. 6 and 7, the shaft passage 255 is formed so as to pass through the inside of the crank journal 222a of the crankshaft 222, the inside of the crank web 222b, and the inside of the crank pin 222c. The shaft flow channel 255 has an end opening 222 h on the end surface 222 e of one end of the crankshaft 222. As shown in FIGS. 4 and 5, the opening 221 </ b> D of the right side wall 221 </ b> R of the crankcase 221 overlaps the end opening 222 h of the axial flow channel 255.

  The cover channel 257 in the cover member 224 and the shaft channel 255 in the crankshaft 222 communicate with each other. Oil from the cover channel 257 is guided to the shaft channel 255 through the end opening 222 h of the end surface 222 e of the crankshaft 222.

  As shown in FIG. 6, each crankpin 222c is formed with an oil supply hole 222C that supplies oil from the shaft flow path 255 to the corresponding bearing 226. Oil from the shaft passage 255 of the crankshaft 222 is supplied to the corresponding bearing 226 through the oil supply hole 222C of each crankpin 222c. As a result, the bearing 226 is lubricated.

  As shown in FIG. 7, a plurality of piston flow paths 254 are connected to the oil gallery 251. The plurality of piston flow paths 254 are provided corresponding to the plurality of pistons 218, respectively. Each piston channel 254 supplies oil from the oil gallery 251 to the corresponding piston 218. In this case, oil is supplied in a direction parallel to the reciprocating direction of the piston 218. Thereby, each piston 218 is cooled. Also, oil is reliably supplied to each piston 218 when each piston 218 reciprocates. Therefore, the cooling efficiency of each piston 218 can be improved.

  As shown in FIGS. 4, 6, and 7, the oil gallery 252 is provided in the lower casing 221 a so as to extend parallel to the crankshaft 222. Oil discharged from the oil discharge port 243a of the oil pump unit 240 in FIG. 7 is guided to the oil gallery 252.

  As shown in FIGS. 6 and 7, a plurality of bearing flow paths 253 are connected to the oil gallery 252. The plurality of bearing flow paths 253 are provided corresponding to the plurality of bearings 225, respectively. Each bearing channel 253 supplies oil from the oil gallery 252 to the corresponding bearing 225. As a result, the bearing 225 is lubricated.

  The oil gallery 252 does not need to guide oil to the cover member 224. Therefore, as shown in FIG. 7, the length W2 of the oil gallery 252 can be made shorter than the length W1 of the oil gallery 251 in the direction in which the crankshaft 222 extends. The oil gallery 251 is disposed above the crankshaft 222, and the oil gallery 252 is disposed below the crankshaft 222.

  According to this arrangement, the width of the lower portion of the lower casing 221a of the crankcase 221 in the left-right direction of the motorcycle 100 can be made smaller than the width of the upper casing 221b. This prevents the lower part of the motorcycle 100 from protruding in the left-right direction. As a result, the bank angle of the motorcycle 100 is prevented from being limited.

(4) Effect In the present embodiment, the oil stored in the oil pan 230 is guided to the end opening 222h of the crankshaft 222 through the oil gallery 251, the pin channel 256, and the oil through the cover channel 257. In this case, as a path for supplying oil from the end opening 222h of the end surface 222e of the crankshaft 222 to the shaft passage 255 inside the crankshaft 222, the pin passage 256 inside the pin member 223 and the cover member 224 A cover channel 257 is used. Therefore, there is no need to provide additional parts for supplying oil. Further, the pin channel 256 can be formed in the pin member 223 and the cover channel 257 can be formed in the cover member 224 by simple processing. As a result, oil can be supplied from the end surface 222e of the crankshaft 222 to the inside of the crankshaft 222 without increasing the number of parts and cost.

  In addition, oil from the shaft passage 255 of the crankshaft 222 is supplied to the corresponding bearing 226 through the oil supply hole 222C of each crankpin 222c. Further, oil from the oil gallery 252 is supplied to the corresponding bearing 225 through each bearing channel 253. As described above, the path of oil supplied to each bearing 226 is different from the path of oil supplied to each bearing 225. Therefore, the pressure of the oil supplied to each bearing 226 and the pressure of the oil supplied to each bearing 225 can be adjusted separately. Therefore, the bearings 225 and 226 can be lubricated with oil having an appropriate pressure.

  Further, the crankcase 221 is a vertically divided crankcase, and the crankshaft 222 is supported by the lower casing 221a and the crankshaft 222 from above and below. Therefore, the oil gallery 251 together with the crankshaft 222 can be easily assembled in the crankcase 221. Further, the crankshaft 222 used in the multi-cylinder engine 200 can be easily accommodated.

(5) Other Embodiments (a) FIG. 8 is a schematic cross-sectional view showing the configuration of the crankshaft 222 and its surroundings in another embodiment. As shown in FIG. 8, an oil supply hole 222A is formed in each crank journal 222a according to another embodiment. Oil from the shaft passage 255 of the crankshaft 222 is supplied to the corresponding bearing 225 through the oil supply hole 222A of each crank journal 222a. As a result, the bearing 225 is lubricated. In this configuration, a plurality of oil supply holes 222A are used to supply oil to the plurality of bearings 225, and the plurality of bearing flow paths 253 are not used. Therefore, the plurality of bearing flow paths 253 are not provided in the oil supply flow path 250.

  (B) Although the engine 200 according to the above embodiment is a multi-cylinder engine, the engine according to the present invention is not limited to this. The engine 200 may be a single cylinder engine.

  (C) The above embodiment is an example in which the present invention is applied to a motorcycle. However, the present invention is not limited to this, and other saddle-type vehicles such as a motorcycle or an ATV (All Terrain Vehicle) are used. The present invention may be applied.

(6) Correspondence between each constituent element of claims and each part of the embodiment Hereinafter, an example of correspondence between each constituent element of the claim and each constituent element of the embodiment will be described. It is not limited to examples.

  In the above embodiment, the opening 221C is an example of an opening, the right side wall 221R is an example of a side wall, the crankcase 221 is an example of a crankcase, and the crankshaft 222 is an example of a crankshaft. Yes, the oil pan 230 is an example of an oil pan, the valve mechanism 216 is an example of a valve mechanism, the chain member 202 is an example of a chain member, the pin member 223 is an example of a pin member, and a cover member 224 is an example of a cover member.

  The oil gallery 251 and 252 are examples of the first and second flow paths, the end face 222e is an example of the end face, the end opening 222h is an example of the end opening, and the axial flow path 255 is the axial flow path. The pin channel 256 is an example of a pin channel, the cover channel 257 is an example of a cover channel, the engine 200 is an example of an engine, and the crank journal 222a is an example of a crank journal. The crank pin 222c is an example of a crank pin.

  The connecting rod 201 is an example of a connecting rod, the bearings 226 and 225 are examples of first and second bearings, respectively, and the oil supply holes 222C and 222A are examples of first and second oil supply holes, respectively. The bearing channel 253 is an example of a third channel, the piston 218 is an example of a piston, the piston channel 254 is an example of a fourth channel, and the lower casing 221a is an example of a lower casing, The upper casing 221b is an example of an upper casing, the body frame 10 is an example of a vehicle body, the rear wheels 5 are examples of driving wheels, and the motorcycle 100 is an example of a saddle-ride type vehicle.

  As each constituent element in the claims, various other constituent elements having configurations or functions described in the claims can be used.

  The present invention can be effectively used for a saddle-ride type vehicle equipped with an engine.

DESCRIPTION OF SYMBOLS 1 Cowl 2 Fuel tank 3 Seat 4 Swing arm 5 Rear wheel 10 Body frame 11 Main frame 12 Rear frame 13 Head pipe 20 Front fork device 21 Steering shaft 22 Fork pipe 23 Handle member 24 Front wheel 30 Exhaust device 31 Exhaust pipe 32 Muffler 100 Automatic Motorcycle 200 Engine 201 Connecting rod 201a Large end portion 201b Small end portion 202 Chain member 210 Cylinder unit 210C Cylinder case 211 Cylinder head 212 Cylinder body 213 Ignition device 214 Intake valve 215 Exhaust valve 216 Valve mechanism 217 Exhaust port 218 Piston 220 Crank unit 221 Crankcase 221a Lower casing 221C, 221D Opening 221b Upper casing 221c Peripheral wall part 221d Bottom part 221E Insertion hole 221F Pin mounting part 221R Right side wall part 222 Crank shaft 222a Crank journal 222A, 222C Oil supply hole 222b Crank web 222c Crank pin 222e End surface 222h End part opening 223 Pin member 224 Cover member 230, 226 Bearing Oil pan 240 Oil pump unit 241 Pump body 242 Upstream pipe 242a Oil suction port 243 Downstream pipe 243a Oil discharge port 244 Strainer 245 Relief valve 246 Oil cooler 247 Oil cleaner 250 Oil supply channel 251 252 Oil gallery 253 Bearing channel 254 Piston channel 255 Axial channel 256 Pin channel 257 Cover channel H Vertical direction L Front-rear direction V Combustion chamber W Left-right direction W1, W2 length

Claims (8)

A crankcase having a side wall formed with an opening;
A crankshaft supported by the crankcase;
An oil pan disposed below the crankcase and storing oil;
A chain member connected to one end of the crankshaft and transmitting the rotational force of the crankshaft to a valve mechanism;
A pin member fixed to the crankcase and applying tension to the chain member;
A cover member attached to the side wall of the crankcase so as to close the opening;
A first flow path through which oil stored in the oil pan is guided,
An end surface of the one end portion of the crankshaft is opposed to the cover member,
Inside the crankshaft, an axial flow path having an end opening at the end face is formed,
Inside the pin member is formed a pin channel through which oil from the first channel is guided,
An engine in which a cover channel that guides oil from the pin channel to the end opening of the crankshaft is formed inside the cover member. The crankshaft has a crank journal and a crankpin;
The engine is
A connecting rod coupled to the crank pin;
A first bearing provided between the crankpin and the connecting rod;
The axial flow path is formed to extend into the crank journal and the crank pin,
The engine according to claim 1, wherein the crank pin has a first oil supply hole that supplies oil from the shaft flow path to the first bearing. A second bearing provided between the crank journal and the crankcase;
A second flow path through which oil stored in the oil pan is guided;
The engine according to claim 2, further comprising a third flow path for supplying oil from the second flow path to the second bearing. The first flow path is disposed above the crankshaft;
The engine according to claim 3, wherein the second flow path is disposed below the crankshaft. A second bearing provided between the crank journal and the crankcase;
The engine according to claim 2, wherein the crank journal has a second oil supply hole that supplies oil from the shaft flow path to the second bearing. A piston connected to the connecting rod;
The engine according to any one of claims 2 to 5, further comprising a fourth flow path that supplies oil from the first flow path to the piston in a direction parallel to a reciprocating direction of the piston. The engine according to any one of claims 1 to 6, wherein the crankcase includes a lower casing that supports the crankshaft from below and an upper casing that supports the crankshaft from above. A vehicle body,
The engine according to any one of claims 1 to 7 provided in the vehicle body,
A saddle-ride type vehicle comprising drive wheels that are rotated by torque generated by the engine.

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