JPS6313375Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement of a lubricating device for an internal combustion engine used in a motorcycle or the like.

(Problems to be solved by conventional technology and ideas) Lubrication of internal combustion engines such as motorcycles is carried out by filtering oil stored in an oil pan installed at the bottom of the crankcase to the primary side using a strainer. This is done by pumping up the oil, passing it through a filter, and supplying the oil under pressure to each lubricating part. As internal combustion engines have become more sophisticated, their structures have become more complex, and for this reason, when lubricating these engines, the number of lubrication points and parts has become more diverse. Therefore, the structure of each part becomes increasingly complicated due to lubrication, which reduces productivity and becomes disadvantageous in terms of maintenance. Furthermore, in the past, when lubricating a crankshaft or transmission mechanism, oil was supplied from both sides of the crankcase to avoid lubricating from the clutch side, which has a complicated mechanism, making the lubricating oil path complicated.

Therefore, the purpose of the present invention is to simplify and rationally arrange the lubricating oil passages that supply oil to the crankshaft and the transmission mechanism in an internal combustion engine as short as possible, and to supply oil from the same direction. An object of the present invention is to provide a lubricating device in which an oil supply path can be kept in communication even by the presence of a friction clutch operating mechanism provided on the main shaft end of a transmission mechanism.

(Means for solving the problem) In order to solve the above problem and achieve the purpose, the present invention provides a cover that covers one side of the crankcase.
An end of the crankshaft and an end of the main shaft of the transmission mechanism are disposed between the cover and the side wall of the crankcase, a friction clutch is disposed on the end of the main shaft, and an oil pump is mounted on the crankcase. In the built-in internal combustion engine, the oil passages formed in both shafts are opened at the end faces of the crankshaft end and the main shaft end between the cover and the side wall of the crankcase, and the oil passages formed in both shafts are opened from the oil pump to the cover. form an oil passage,
The oil passage is connected to the oil passage opened in the end face of the crankshaft, and there is a space between the oil passage opened in the end face of the main shaft and the oil passage formed in the cover. A hollow lift pin that operates the friction clutch is slidably fitted and installed, and a round bar-shaped lift cam having a cam portion having a half-moon cross section that engages from a direction substantially perpendicular to the end face of the hollow lift pin is rotatably mounted. A shaft hole for oil sealing and storage is formed in the cover, and the shaft hole communicates with the oil passage formed in the cover so that the hollow lift pin end face and the semicircular cross-section cam part engage. The present invention is characterized in that the hollow lift pin and the round bar-shaped lift cam are arranged eccentrically with respect to each other.

(Function) Since the oil is supplied into the main shaft of the crankshaft and the transmission mechanism through the cover provided on one side of the crankcase, the oil is supplied to the crankshaft and the transmission mechanism in the same direction.
That is, it can be carried out from the cover side, and the lubricating oil path can be shortened and simplified and arranged rationally.

In particular, it houses a round bar-shaped lift cam with a half-moon-shaped cam section that engages from a substantially right angle to the end face of a hollow lift pin that is installed between the oil passage in the main shaft and the oil passage in the cover to operate the friction clutch. The shaft hole formed in the cover communicates with the oil passage in the cover, and the part where the hollow lift pin end face and the semicircular cam part engage has a diameter larger than that of the semicircular cam part, and and a round bar-shaped lift cam are arranged with their centers eccentric to each other, so that the hollow lift pin end face and the round bar-shaped lift cam, which form the operating mechanism of the friction clutch provided on the end of the main shaft of the transmission mechanism, and the semicircular cam section of the round bar-shaped lift cam. The oil supply passage can also be maintained in a communicating state by engagement with the oil supply passage.

(Embodiment) Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic side view of a motorcycle 1. The motorcycle 1 supports a front fork 4 which supports a front wheel 5 through a head tube 3 at the front end of a frame 2 so as to be freely steerable. A fuel tank 6 is disposed at the upper front part of the frame 2, and a seat 7 is disposed behind the fuel tank 6. A rear fork 8 that supports a rear wheel 9 is pivotally extended from the rear part of the lower part of the frame. This is a reaction unit interposed between the frame and the frame.

The engine 11 is located at the lower front of the frame 2.
As shown in FIG. 2, the engine 11 includes a crankcase 30, a cylinder block 111 raised above this, a cylinder head 112 provided above this, and a cylinder head cover 113 provided above this. Consisting of

In the embodiment, the crankcase 30 is the left and right halves 3.
Consists of zygote 1,32, left and right halves 31,3
The shear parts at both ends of the crankshaft 13 are rotatably supported via bearings 12 on bearings 311 and 321 provided at the front of the partition wall of No. 322 rotatably supports the countershaft 17 of the transmission mechanism via the bearing 16, and the countershaft 17 of the transmission mechanism provided at the rear thereof is supported by the bearing part 313,
323, it is rotatably supported via the bearing 18. The case half 31 on the left side has only the function of supporting one end of each of the shafts 13, 15, 17, and the end of the countershaft 17 extends toward the case half 31, and a sprocket 19 is attached to the extended end. A chain 21 is wound between the rear wheel 9 and a sprocket 20 provided on the rear wheel 9 to obtain driving force. The case side end of the crankshaft 13 also extends outward, a flywheel 22 forming an ACG is connected to the extended part, and the end on this side is covered with an ACG cover 23.

The side wall 324 of the right case body 32 constitutes a partition, and the outside of this is covered with the cover 24.
4 substantially forms a part of the right half 32, and an oil pump 2 is located at the front adjacent to the crankshaft 13.
5 is provided so as to be supported near the bearing portion 321 of the side wall 324, and the shaft 251 of the oil pump 25 is connected to the gear 252 provided thereon by the gear 131 provided on the portion of the crankshaft 13 protruding outward (to the right) of the bearing portion 321. It is driven by this.

The right end 132 of the crankshaft 13 projects outside the side wall 324, and the right ends 151, 171 of the shafts 15, 17 of the transmission mechanism 14 project outside the side wall 324 and face the inside of the cover 24.
A multi-plate clutch 26 is provided at the end of the main shaft 15 on this side, an inner 261 of which engages with the main shaft 15, and an outer 262 of which engages the starter gear 15 with the outer periphery of the floating bush 153.
The primary driven gear 2 is connected to the outer 262 and meshes with the internal gear 2 at the center of the primary driven gear 2.
63 meshes with a primary drive gear 131 provided at the shaft end of the crankshaft 13, and transmits engine output via the main shaft 15. The friction engagement mechanism 264 interposed between the inner and outer parts is opened by moving the pressure plate 265 backward against the spring 267 with the lift pin 266, and is kept in the engaged state by the spring 267. Yes, the lift pin 266 has a hollow pin shape and is connected to the axial passage 152 of the hollow main shaft.
A portion is slidably fitted to the end.

The aforementioned oil pump 25 is installed in the front part of the cover 24.
A passage 241 that communicates with the discharge side of the cover 24 is provided in the form of a blind hole facing outward in the axial direction, and the passage 241 is connected to a communication passage 243 provided in the side wall 242 of the cover 24 in a direction perpendicular to the plate thickness direction. The communication passage 243 is a part of the intermediate part and is a separate passage 24 in the direction of the crankshaft axis.
4, and the passage 244 is communicated with a passage 133 provided in the axial direction of the crankshaft via a joint 245 that is pressed by a spring 246 in the sealing direction. Further, a long hole 248 is provided through the joint 245, and the crankshaft 13
across the passage 133 of the end 132 of this end 1
Since the retaining pin 134 fixed to the cover 32 is inserted into the elongated hole 248, the joint 245 will not fall off even before the cover 24 is assembled. A communication passage 247 that communicates with the passage 243 is provided in the cover 24 until it reaches the axially outer part of the clutch 26, while a part of the cover 24 that faces the axially outer part of the clutch is provided with a communication passage 247 that communicates with the passage 243 in the same direction as the passage 247. A round bar-shaped lift cam 27 is rotatably fitted through a shaft hole 271, and an outer end 272 of the lift cam 27 is led out and connected to an operating lever, and connected to a clutch operating element via a control cable. Link. Half-moon-shaped cam 273 formed at the tip of the lift cam 27
is engaged with the tip 268 of the lift pin 266 that can protrude into the tip 274 of the shaft hole 271. The shaft hole tip portion 274 has a larger diameter than the semicircular cam portion 273 and has a gap therebetween, and the gap communicates with an axial passage 269 formed in the lift pin 266. is in communication with the passage 247, so the passage 247 is in communication with the passage 152 of the main shaft 15.

Here, since the centers of the lift pin 266 and the lift cam 27 are offset from each other and are eccentric, even if the half-moon-shaped cam 273 rotates and the lift pin 266 is in the lifted state, the axial passage 269 of the lift pin 266 and the tip of the shaft hole A sufficient communication state with H.274 is ensured. Note that since the support hole 271 of the lift cam 27 and the passage 247 are in communication with each other, the sealing material 27
6 is inserted to provide an oil seal.

In the figure, 28 is an oil supply pipe that connects the passage of the cover and the countershaft bearing, and 29 is a starting shaft, which connects the bearing 314 of the left half body 31 and the cover 2.
4, and the engine is started by pressing the kick pedal.

Next, the operation and effect will be described in detail. When the oil pump 25 is driven, oil is pumped up from an oil pan (not shown) through an oil strainer, and is further supplied to the passage 241 through a filter. The passage is provided in a cover on one side of the crankshaft 13 and the shafts 15 and 17 of the transmission mechanism,
Oil is in passages 243, 244, joint 245
It is supplied to the crankshaft 13 through a passage 133, and is supplied to a bearing section of the crankshaft and the like through a passage 133. Here, the joint 245 is elastically biased by a spring 246 against the flat surface of the boss portion of the cover 24, and communicates with the oil passage 244 of the cover 24 in a sealed state, so that no oil leakage occurs at this connecting portion. Further, even if the concentricity between the oil hole 133 of the crankshaft 13 and the cover 24 side passage 244 is slightly out of alignment, there is no problem in the delivery of oil by the joint 245 because the contact surface between the joint 245 and the cover 24 is wide.

The passage 15 of the main shaft 15 also communicates with the passage 243 through a passage 247 provided in the cover 24.
Oil is supplied to the shaft 15, and a clutch 26 is provided to the shaft 15, and a lift pin and a lift cam mechanism for operating the clutch are interposed between the case and the case. By making the hole housing the part part of the passage, oil can be supplied from the clutch side through the cover.

(Effects of the invention) As described above, according to the invention, the crankshaft and the transmission mechanism can be supplied with oil from the cover side in the same direction, and the lubricating oil path can be shortened and simplified to be rationally arranged. At the same time, the oil supply path is kept in communication by the engagement between the end face of the hollow lift pin, which constitutes the operation mechanism of the friction clutch provided on the end of the main shaft of the transmission mechanism, and the half-moon-shaped cam section of the round bar lift cam. be able to.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of the motorcycle, Fig. 2 is an explanatory cross-sectional view of the main parts of the engine, Fig. 3 is an enlarged view of the main parts, and Fig. 4 is a cross-sectional view taken along the - arrow in Fig. 3. be. In the figure, 13 is a crankshaft, 14 is a transmission mechanism, 15 is a main shaft, 24 is a cover, 30 is a crankcase, 132, 151 are shaft ends, 133, 152 are passages, 241, 243,
247 is an oil passage, 245 is a joint, 246 is a spring member, and 266 is a lift pin.

Claims (1)

[Scope of Claim for Utility Model Registration] A cover is provided to cover one side of the crankcase, and an end of the crankshaft and an end of the main shaft of the transmission mechanism are disposed between the cover and the side wall of the crankcase, In an internal combustion engine in which a friction clutch is disposed on the main shaft end and an oil pump is built in the crankcase, a friction clutch is provided within both shafts at the end face of the crankshaft end and the main shaft end between the cover and the crankcase side wall. each of the formed oil passages is opened, an oil passage from the oil pump is formed in the cover, and the oil passage is connected to the oil passage opened in the end face of the crankshaft; A hollow lift pin for operating the friction clutch is slidably fitted and installed between the oil passage opened at the end face of the oil passage and the oil passage formed in the cover, A shaft hole is formed in the cover to rotatably accommodate a round bar-shaped lift cam having a cam portion having a semicircular cross section that engages from a direction substantially perpendicular to the end surface, and is sealed with oil, and the shaft hole is arranged in the cover. A portion communicating with the oil passage formed in the hollow lift pin and engaging the end face of the hollow lift pin and the cam portion having a semicircular cross section is formed to have a larger diameter than the cam portion having a semilunar cross section, and the hollow lift pin and the round bar lift cam A lubricating device for an internal combustion engine, characterized in that the two are arranged eccentrically with respect to each other.