JPH04282054A - Engine lubricating circuit for motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine lubrication circuit for a motorcycle.

0003

[Prior Art] In the case of motorcycles that transmit engine power to the rear wheels via a shaft drive mechanism, the crankshaft and transmission are generally placed inside the engine case horizontally with respect to the vehicle body. A bevel gear mechanism is installed at the end of the drive shaft (output shaft) to transmit power to the propeller shaft (drive shaft) that extends toward the rear wheels, thereby driving the rear wheels.

In such a shaft drive mechanism, the drive system can be easily changed to a chain drive, belt drive, etc. by separating the bevel gear case that supports the bevel gear mechanism from the engine case and detachably attaching it to the engine case. There is something like this.

Conventionally, in an engine equipped with such a removable bevel gear case, lubricating oil is sealed inside the bevel gear case to lubricate the bevel gear mechanism independently from the lubricating circuit of the entire engine, thereby making it easy to install and remove the bevel gear case. It was easy.

[0006]

[Problems to be Solved by the Invention] However, in order to seal lubricating oil inside the bevel gear case and independently lubricate the bevel gear mechanism, it is necessary to make the bevel gear case a sealed structure and to provide a dedicated breather structure. ,
The structure of the bevel gear case had become complicated.

[0007] In order to avoid this, if the engine's lubrication circuit is introduced inside the bevel gear case, it is necessary to extend a separate pipe from the engine case and connect it to the bevel gear case, which worsens the ease of attaching and detaching the bevel gear case. do.

[0008] Furthermore, all of these means increase costs.

The present invention has been made in consideration of the above-mentioned problems, and there is no need to independently lubricate the bevel gear mechanism, the bevel gear case has a simple structure and good detachability, and furthermore, it is supported by the bevel gear case. An object of the present invention is to provide an engine lubrication circuit for a motorcycle that can lubricate a clutch push rod similar to a bevel gear mechanism. [Structure of the invention]

0010

[Means for Solving the Problems] In order to solve the above object, an engine lubrication circuit for a motorcycle according to the present invention provides an engine lubrication circuit for a motorcycle that lubricates an engine equipped with a removable bevel gear case. A lubricating oil flow path communicating from the inside of the engine case to the inside of the bevel gear case is provided on the engagement surface between the bevel gear case and the engine case.

Further, the lubricating oil passage is communicated with a clutch push rod support chamber provided in the bevel gear case.

0012

[Operation] By configuring the engine lubrication circuit of the motorcycle in this manner, the engine lubrication circuit can be introduced into the bevel gear case without deteriorating the ease of attaching and removing the bevel gear case. Additionally, the structure of the bevel gear case is simplified. Furthermore, the clutch push rod slides smoothly.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the engine lubrication circuit for a motorcycle according to the present invention will be described below with reference to the drawings.

A motorcycle 1 shown in FIG. 1 has an engine 3 mounted near the front of a body frame 2, and a rear wheel 5 is driven by a shaft drive mechanism 4 extending rearward from the engine 3. A clutch lever 7 and a master cylinder 8 are attached to the handlebar 6 to perform clutch engagement and engagement operations, which will be described later.

FIG. 2 is a cross-sectional view of the engine 3 and shaft drive mechanism 4 taken along the line A--A shown in FIG.

Inside the engine case 9, a crankshaft 10, a countershaft 11, and a driveshaft 12 are pivotally supported in a direction transverse to the vehicle body. A clutch 13 is mounted, for example, on the right end of the countershaft 11, and a primary drive gear 14 that is integral with the clutch 13 meshes with a primary drive gear 15 that is integrally formed with the crankshaft 10.

A plurality of gears are fitted into the counter shaft 11 and the drive shaft 12, and the transmission 1
6 are configured.

A bevel gear case 17 is fixed to, for example, the left side of the engine case, and the left end of the drive shaft 12 is passed through the bevel gear case 17. The bevel gear case 17 consists of a case body 18 and a lid part 19, and a propeller shaft 20 that is disposed perpendicularly to the drive shaft 12 and extends rearward is pivotally supported inside.

The drive shaft 12 and propeller shaft 20 rotate in conjunction with each other via a primary bevel gear mechanism 21.

[0020] Thus, the rotation of the crankshaft 10 is transmitted to the clutch 13 and the countershaft 11, to the drive shaft 12 via an arbitrary gear ratio of the transmission 16, and further to the propeller shaft 20 via the primary bevel gear mechanism 21. .

The rotation of the propeller shaft 20 is shown in FIG.
The rear wheels 5 are driven through a secondary bevel gear mechanism 22 shown in FIG.

Note that 23 is an oil pump, which is driven by an oil pump drive gear 24 that is integrated with the primary driven gear 14.

A clutch push rod 25 is inserted and supported in the front portion of the bevel gear case 17 so as to be able to smoothly slide left and right, and this portion serves as a clutch push rod support chamber 26. A release cylinder 27 is fixed to a side surface of this clutch push rod support chamber 26.

The left end of the clutch push rod 25 is passed through the release cylinder 27, and is in contact with a piston 28 that reciprocates from side to side within the release cylinder 27. Further, the right end portion of the clutch push rod 25 is loosely inserted into the hollow portion of the countershaft 11.

The release cylinder 27 is connected to an oil hose 29
is connected to the master cylinder 8 mentioned above,
Hydraulic oil is sealed in the master cylinder 8, release cylinder 27, and oil hose 29.

[0026] Then, when the passenger squeezes the clutch lever 7,
The hydraulic pressure in the master cylinder 8 is transmitted through the oil hose 29 and applied to the release cylinder 27, and the piston 28 moves to the right. Therefore, the clutch push rod 25 is pushed into the countershaft 11, a clutch release mechanism (not shown) is activated, and the clutch 13 is disconnected, and the primary driven gear 14 is pushed into the countershaft 11.
Idling around.

Now, FIGS. 3 and 4 (view from arrow B in FIG. 3)
Engine case 9 and bevel gear case 17 as shown in
A lubricating oil passage 31 communicating from the inside of the engine case 9 to the inside of the bevel gear case 17 is provided on the engagement surface 30 with the engine case 9 .

The lubricating oil passage 31 passes through a hollow portion of a knock pin 32 for positioning the bevel gear case 17, and communicates with the clutch push rod support chamber 26.

FIGS. 5 and 6 show the entire lubrication circuit of the engine 3.

The lubricating oil 33 stored in the lower part of the engine case 9 passes through a strainer 34 to the oil pump 23.
After being cooled by an oil cooler 35 (also shown in FIG. 1) installed outside the engine 3 and purified by an oil filter 36, it is sent to an oil gallery 37 inside the engine case 9.

The oil gallery 37 communicates with the inside of the bevel gear case 17 through a lubricating oil passage 41 for lubricating the bearing 38 of the crankshaft 10 and the valve mechanism 40 in the cylinder head 39, and the knock pin 32 described above. The lubricating oil flow path 31 is branched.

The lubricating oil sent to the cylinder head 39 through the lubricating oil passage 41 returns to the lower part of the engine case 9 through the return pipe 42. Further, the lubricating oil sent to the bevel gear case 17 through the lubricating oil flow path 31 passes through the hollow part 20a of the propeller shaft 20 and is ejected from the jet hole 20b, and after collecting inside the bevel gear case 17, the drive shaft 12 is Axial bearing 4
It overflows from between 3 and returns to the lower part of the engine case 9.

In the engine lubrication circuit configured as described above, there is no need to independently lubricate the primary bevel gear mechanism 21, so there is no need for the bevel gear case 17 to have a sealed structure or a dedicated breather structure, and the structure is simple. production costs.

Furthermore, the bevel gear case 17 is easy to attach and detach, and by closing the lubricating oil passage 31 of the engine case 9, the drive system can be easily changed to a chain drive, belt drive, or the like.

Furthermore, the push rod 25 inserted into the push rod support chamber 26 of the bevel gear case 17 is lubricated with lubricating oil, so it can slide very smoothly, and the operation feeling of the clutch 13 is improved, and the push rod The durability of 25 is also improved.

[0036]

As explained above, the engine lubrication circuit for a motorcycle according to the present invention has a lubricating oil flow path communicating from the inside of the engine case to the inside of the bevel gear case, on the engagement surface between the bevel gear case and the engine case. Since it is provided, there is no need to independently lubricate the bevel gear mechanism,
Since there is no need for a sealing structure or a dedicated breather structure for the bevel gear case, the structure of the bevel gear case is simplified.

Furthermore, since the bevel gear case is easy to attach and detach, the drive system can be easily changed.

Furthermore, since the lubricating oil passage is communicated with the clutch push rod support chamber provided in the bevel gear case, the clutch push rod is lubricated and can slide very smoothly. This improves the clutch operation feeling and improves the durability of the clutch push rod.

[Brief explanation of the drawing]

FIG. 1 is a left side view of a motorcycle equipped with a shaft drive mechanism.

FIG. 2 is a sectional view taken along line A-A of the engine and shaft drive mechanism shown in FIG. 1;

FIG. 3 is a plan cross-sectional view showing an embodiment of the engine lubrication circuit for a motorcycle according to the present invention.

FIG. 4 is a view in the direction of arrow B in FIG. 3.

FIG. 5 is a side view showing the engine lubrication circuit.

FIG. 6 is a plan view showing the lubrication circuit of the engine and bevel gear case.

[Explanation of symbols]

9 Engine case 17 Bevel gear case 25 Clutch push rod 26 Clutch push rod support chamber 30 Engagement surface 31 Lubricating oil flow path

Claims (2)

[Claims] Claim 1: In an engine lubrication circuit for a motorcycle that lubricates an engine equipped with a removable bevel gear case, an engagement surface between the bevel gear case and the engine case includes:
An engine lubrication circuit for a motorcycle, characterized in that a lubricant oil passage is provided that communicates from the inside of the engine case to the inside of a bevel gear case. 2. The engine lubrication circuit for a motorcycle according to claim 1, wherein the lubricating oil passage communicates with a clutch push rod support chamber provided in a bevel gear case.