JPS6027113Y2 - Motorcycle rear wheel suspension system - Google Patents

Description

[Detailed description of the invention] This invention relates to a rear wheel suspension system for motorcycles, which allows for a large vertical swing stroke of the rear wheel, reduces the unsprung weight around the axle, and provides stable running. It has improved characteristics.

In motorcycles, the rear wheel is usually supported by a swing arm.

The front end of this swing arm is pivotally connected to the vehicle body frame by a shaft, and the rear end is pivotally connected to the rear wheel.

A cushion unit is interposed between the vicinity of the rear end of the swing arm and the vehicle body frame to provide appropriate resistance to the vertical movement of the swing arm and absorb shock.

In this way, conventional rear wheel suspension systems for motorcycles have a cushion unit interposed between a position near the rear end of the swing arm and the top of the vehicle body frame, so the vertical swing stroke of the rear wheel is large. The unsprung weight around the axle also increased, leaving room for improvement in terms of driving stability.

The present invention has been made in view of this point, and is an attempt to solve this problem.

An embodiment of the present invention will be described with reference to FIGS. 1 and 2. Reference numeral 1 denotes a vehicle body frame made of pipe material to which an engine, fuel tank, seat, etc. (not shown) are attached.

A bracket 2 is attached to approximately the center of the vehicle body frame 1, and a front end of a swing arm 3 is pivotally attached to the bracket 2 by a shaft 4.

An axle 5 is fitted into the rear end of the swing arm 3,
A rear wheel 6 is pivotally attached to this axle 5.

The swing arm 3 is provided with brackets 7.8 near its front end and near its rear end.

On the other hand, a bracket 9 is also provided at the bottom of the front end pivot point of the swing arm 3 of the vehicle body frame 1 (the part of the shaft 4 of the bracket 2).
is provided.

A first link 11 and a second link 1 are connected between the bracket 9 and the bracket 8 by a shaft 10.
2 are pivotally connected at both ends by shafts 13.14.

A bracket 7 provided near the front end of the swing arm 3
The cushion unit 1 has a structure as shown in Fig. 3.
The upper end of 5 is pivotally connected by a shaft 16.

The lower end of this cushion unit 15 is pivotally connected to the connecting portion of the first and second links 11, 12.

The cushion unit 15 consists of a spring 17 and an oil damper 18.

In this rear wheel suspension system configured in this way, when the rear wheel 6 receives a lifting force from the road surface while driving, the axle 5 is displaced from the position a to the position b in Fig. 1. The connected eleventh second link 11.12 is also displaced from the a position to the b position, and the cushion unit 15 is moved from the length / to the 12
This creates a pressure path and absorbs the shock.

Since the present invention is constructed as described above, first,
By appropriately setting the mounting position, length, etc. of the second link, there is an advantage that the vertical swing stroke of the rear wheel can be increased.

Additionally, the unsprung weight around the axle is reduced, which improves driving stability.

[Brief explanation of drawings]

Fig. 1 is a side view of the main parts of an embodiment of the present invention, Fig. 2 is a plan view of the link part in Fig. 1, and Fig. 3 is a front view of the cushion unit in Fig. 1. . 1...Body frame, 3...Swing arm, 5...Axle, 6...Rear wheel, ? , 8.
9...Bracket, 10...Shaft, 11
...First link, 12...Second link, 15...Cushion unit.

Claims (1)

[Scope of utility model registration request] In a motorcycle in which a rear wheel is supported by a swing arm, a bracket is provided near the front end and near the rear end of the swing arm, and a bracket is also provided at a lower part of the front end pivot portion of the swing arm of the vehicle body frame, and the bracket and Both ends of the first and second links connected midway are pivotally connected between the bracket near the rear end of the swing arm, and the connecting portion of the first and second links is connected to the bracket near the front end of the swing arm. A rear wheel suspension device for a motorcycle, characterized in that a cushion unit is interposed between the bracket and the rear wheel suspension device.