JPS63227482A - Motorcycle rear wheel shock absorber - 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] (Industrial application field) The present invention relates to a rear wheel shock absorber for a motorcycle.

(Prior art) Rear wheel shock absorbers for motorcycles include a link mechanism between a rear fork whose front end is pivoted to the vehicle body and a shock absorber whose one end is attached to the vehicle body. On the other hand, there is a system in which the amount of increase in the buffering force of a buffer is increased in a progressive curve.

(Problems to be Solved by the Invention) The above-mentioned link/mechanism usually includes a first link member whose one end is connected to the shock absorber and whose intermediate part is pivotally connected to the rear fork side, and the first link member whose one end is connected to the shock absorber. It is composed of a second link member whose other end is pivotally connected to the vehicle body frame side, and in such a structure, the shock absorber, rear fork and two link members are concentrated in a narrow space, Therefore, there are significant restrictions on the position, length, pivot position, etc. of these members.

There is a problem in that it becomes difficult to provide desired ratio characteristics to the rear wheel shock absorber. Furthermore, there is a problem in that the use of two link members increases the weight of the rear wheel shock absorber itself.

The present invention has been made in view of such conventional circumstances,
The purpose of this is to configure the link mechanism with one member, prevent the concentration of each member of the rear wheel shock absorber, and reduce restrictions on the position, length, pivot position, etc. of each member as much as possible. The object of the present invention is to make it possible to obtain desired ratio characteristics and to reduce the weight of a rear wheel shock absorber.

(Means for Solving the Problems) In order to achieve the above object, the present invention pivots the front end of the rear fork 23 that supports the rear wheel 22 to a mounting bracket 17 attached to the vehicle body frame 3. A link arm is provided between the other end of the shock absorber 25 connected at one end and the rear fork 23, one end of the link arm 27 is pivotally connected to the other end of the shock absorber 25, and approximately at the middle of the link arm 27. A long hole 17b is formed in the mounting bracket 17, and the other end of the link arm 27 is loosely inserted into the long hole 17b.

(Function) The link mechanism that connects the shock absorber and the rear fork is configured with one link arm, reducing the number of constituent members of the rear wheel shock absorber and preventing concentration of each member. Restrictions such as length and pivot position can be reduced as much as possible, and desired ratio characteristics can be easily given to the rear wheel shock absorber. Furthermore, it is possible to reduce the weight of the rear wheel shock absorber.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a side view of a motorcycle to which a rear wheel shock absorber according to the present invention is applied, FIG. 2 is a side view of the rear wheel shock absorber, and FIG. 3 is an exploded view of the main parts thereof.

In the figure, 1 indicates a motorcycle, 3 indicates its body frame, and the body frame 3 extends obliquely downward from the head pipe 5.
Left and right center tubes with curved tips 7.
7. A lower tube (not shown) that extends forward from the lower part of the center tube 7; a down tube 9.9 that extends diagonally upward from the front end of the lower tube and whose tip is joined to the lower end of the head pipe 5; and a down tube 9.9 that extends backward from the center tube 7. The seat rail 11. and this seat rail 1
Subframe 1 provided between 1 and center tube 7
Consists of 3rd prize.

A fuel tank 15 is provided between the center tubes 7 and 7, and a seat (not shown) is placed on the seat rail ll.
An engine unit (E) is installed on the lower frame. Also, on the outside of the curved portions 7a, 7a of the center tube 7.7 are mounting brackets) 17.17 and 19.21.
This mounting bracket 17 has the rear wheel 2 attached at the tip.
The base of the rear fork 23 supporting the rear fork 2 is pivotally connected.

Further, one end of the shock absorber 25 is attached to a bracket 24 attached to the lower middle of the center tube 7, and a link arm 27 is provided between the other end of the shock absorber 25 and the fork 23. The shock absorber 25, link arm 27, etc. constitute a rear wheel shock absorber 30. This rear wheel shock absorber 30 will be explained below.

As mentioned above, the mounting bracket 17 is attached to the outside of the curved portion 7a of the center tube 7, and as is clear from FIG. 2, the mounting bracket 17 forms a wide surface portion 17a whose upper portion extends rearward. An arcuate long hole 17b is formed in this surface portion 17a. In addition, left and right mounting brackets 17, 1 are provided at the middle part of the mounting bracket 17.
A hollow rod 18 connecting the parts 7 is fixed. On the other hand, the rear fork 23 has left and right fork portions 23a.

The front end of the fork member 23b is rotatably attached to the outer periphery of the hollow rod 18 via a needle bearing 34, and a cross member (
A pair of left and right stays 36 and 37 are provided on the upper surface (not shown), and these stays 36 and 37 are connected by a pole 40. This port 40 is inserted into a hole 27b formed in the intermediate portion 27a of the link 7-arm 27, and this port 40 is inserted into the link arm 2 through a needle bearing 42.42.
7 is rotatably supported. And this sunk arm 27
The upper end 27c is pivotally connected to the other end of the shock absorber 25 whose one end is connected to the bracket 24 via a shaft 60, and the shaft 41 fixed to the lower end 27d of the link arm 27 is loosely inserted into the elongated hole 17b. The shaft 41 is supported by a needle bearing 44 in the elongated hole 17b. In this way, in this example,
One link arm 27 replaces the conventional two link members.

In the above, when the rear fork 23 swings upward,
The link arm 27 has a shaft 41 fixed to its lower end that is connected to the elongated hole 1.
7b, the link arm 27 rotates in the direction shown by arrow A, shortens the shock absorber 25, and generates a shock absorbing force.

FIG. 2 shows the state when the rear fork 23 is located at the lowest position, and FIG. 4 shows the state when the rear fork 23 is located at the highest position.

As described above, according to this embodiment, the link arm 27 is the only link member provided between the shock absorber 25 and the rear fork 23, and the number of members constituting the rear wheel shock absorber 30 is reduced. Concentration can be prevented, restrictions on the position, length, pivot position, etc. of each member can be reduced as much as possible, and desired ratio characteristics can be easily obtained. Furthermore, the weight of the rear wheel shock absorber 30 can be reduced.

(Effects of the Invention) As described above, according to the present invention, only the link arm is used as the link member and the number of constituent members of the rear wheel shock absorber is reduced, so that desired ratio characteristics can be easily obtained. The weight of the shock absorber can be reduced.

[Brief explanation of drawings]

Fig. 1 is a side view of a motorcycle to which the rear wheel shock absorber according to the present invention is applied. Fig. 2 is a side view of the rear wheel shock absorber, Fig. 3 is an exploded view of the main parts, and Fig. 4 shows the link arm pointing upward. A side view of the rear wheel shock absorber in a state in which it has been moved to is shown. In addition, in the drawing, 3 is a vehicle body frame, 17 is a mounting bracket, 17b is a long hole, 23 is a rear fork, 25 is a shock absorber,
27 is a link member. Figure 3 Figure 4 Figure 2! ?

Claims (1)

[Claims] The front end of a rear fork that supports the rear wheel is pivotally connected to a mounting bracket attached to the vehicle body frame, and the other end of a shock absorber whose one end is connected to the vehicle body frame and the rear fork are provided. a link arm is provided, one end of the link arm is pivotally connected to the other end of the shock absorber, and a substantially middle portion of the link arm is pivotally connected to the rear fork side; a long hole is formed in the mounting bracket; A rear wheel shock absorber for a motorcycle, characterized in that the other end of the link arm is loosely inserted into the elongated hole.