JPS5821827Y2 - Motorcycle engine support structure - Google Patents

Description

[Detailed explanation of the invention] This invention consists of three
This invention relates to a motorcycle engine support structure that is supported at points.

Conventionally, in motorcycles, as shown in Japanese Utility Model Publication No. 51 24051, a support shaft is inserted into the rear part of the crankcase, and the support shaft is inserted into the left and right bearings of the swing arm on both sides of the rear part of the crankcase. It is known that the swing arm is supported by the vehicle body frame together with the rear part of the crankcase.

However, in such a structure, considering that there is an external input from the swing arm, the support stability of the crankcase, that is, the engine, is low, and when assembling the swing arm, it is sometimes necessary to support the swing arm horizontally. Because of the necessity, assembly workability was also low.

The present invention has been devised in view of these points, and its main purpose is to provide a motorcycle engine support structure that improves the support stability of the engine in the assembled state and is easy to assemble.

Hereinafter, the configuration of the present invention will be explained based on examples.

In the drawings, 1 is a vehicle body frame, 2 is an engine, 3 is a crankcase, and 4 is a swing arm.

The front and lower parts of the crankcase 3 are fixed to brackets 1a and 1b provided on the vehicle body frame 1 with set bolts.

On the other hand, the rear part of the crankcase 3 is provided with a support hole 3a in which a bushing 3b is mounted, and the rear part is held between the left and right bearings 4a of the swing arm 4, and the support shaft 5 is inserted through them. The shaft 5 is fixed to the swing arm bracket 1c of the vehicle body frame 1, and supports the rear part of the crankcase 3 together with the swing arm 4.

In the bearing portion 4a, a vibro is fixed to the swing arm 4, and a bearing 7 is press-fitted approximately in the center of the vibro.
Inside the bearing 7 is a sleeve 8 having approximately the same length as the pipe 6.
Further, a cap 9 having a substantially U-shaped cross section that restricts the axial movement of the vibro and forms a contact surface of the bearing portion 4a extends from both sides of the bearing portion 4a to the left and right ends of the sleeve 8. It is formed by being fitted into the

A rubber 10 is baked onto the outer peripheral surface of the cap 9, and the rubber 10 comes into contact with the inner peripheral surface of the vibro, thereby creating a seal between the rubber 10 and both sides of the vibro 160.

In the modification shown in FIG. 4, a shim 11 maintains the distance between the sleeve 8 and the vibro.

The bearing portion 4a is lubricated with grease.

As described above, the present invention increases the support stability of the engine by supporting the front, lower and rear parts of the engine crankcase with the vehicle body frame, and furthermore, the rear part is supported together with the swing arm via the support shaft. Support reduces the number of processing steps and facilitates manufacturing.

In addition, the bearing part of the swing arm is press-fitted into a pipe fixed to the swing arm, a sleeve is fitted into the bearing, and a cap is formed by baking rubber on the outer peripheral surface of each of the left and right ends of the sleeve. Since the lubricating oil penetrates into the FJ between the cap and the sleeve, anti-rust surface treatment of the sleeve is no longer required, and a flange is formed on the sleeve to restrict the movement of the pipe in the axial direction. Not only is it less expensive because it is unnecessary, but the sleeve is positioned to a certain extent by the bearing press-fitted into the pipe and the elasticity of the cap's rubber, making it easier to manufacture since there is no need to assemble the swing arm while supporting it horizontally. has.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; Fig. 1 is a front view of the invention, Fig. 2 is a bottom view thereof, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 is a sectional view of a modified example. It is a diagram. 1...Vehicle frame, 1a...Bracket, 1b...Bracket, 1c...
Swing arm bracket, 2... engine,
3...Crankcase, 4...Swing arm, 4a...Bearing portion, 5...Support shaft.

Claims (1)

[Scope of utility model registration request] A support shaft is inserted into the rear part of a crankcase whose front and rear parts are each supported by brackets fixed to the body frame of the motorcycle, and the support shaft is inserted into left and right bearings of a swing arm on both sides of the rear part of the crankcase, In a structure in which the swing arm is supported by the vehicle body frame together with the rear part of the crankcase, the bushings are fitted into the support holes at the rear part of the crankcase, while the left and right bearings are located approximately at the center of the pipe fixed to the swing arm. A cap having a substantially U-shaped cross section is formed by press-fitting a bearing into the bearing, fitting a sleeve of approximately the same length as the pipe into the bearing, and baking rubber outwardly on the left and right ends of the sleeve. is configured such that the rubber of the cap comes into contact with the inner circumferential surface of the pipe,
A motorcycle engine support structure, characterized in that a support shaft is inserted through the bush and sleeve.