JPH0464916B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a suspension system for a motorcycle, which enables the suspension to have a large stroke and to provide two-stage spring characteristics. It is designed so that it can be attached to a vehicle body with a conventional structure.

(Prior art) Suspension systems for motorcycles, especially those for the rear wheels,
A torii-shaped swing arm is formed by joining the left and right arms with the wheels inserted through the rear ends at the front to form a torii-shaped swing arm, and this swing arm is pivotally connected to the vehicle body frame at the front end so that it can swing vertically relative to the vehicle body frame. Usually, a suspension is attached between each of the left and right arms of this swing arm and the upper part of the vehicle body frame.

A characteristic required of a suspension is a progressive effect, and in order to obtain this effect even more, recently, instead of the configuration in which each suspension is provided on the left and right arms, a full floater type or a semi-floater type that uses one suspension has been developed. There is a tendency for many types of suspension to be adopted.

(Problem to be solved by the invention) However, the two-suspension type that has been widely used in the past also has many advantages, and by improving it, a progressive effect or stepped characteristic can be obtained. It is also significant.

The present invention has been made in view of this point,
In a type of motorcycle in which a suspension is provided between each of the left and right arms of a swing arm and the vehicle body frame, a stepped effect is obtained in the cushioning characteristics.

(Means for Solving the Problems) As a means for solving the above-mentioned problems, the present invention provides an arrangement in which one of the brackets provided at the upper end and the lower end of the spring type suspension is aligned in the longitudinal direction of the spring with respect to the spring receiver. One end of an arm-shaped link is pivotally connected to the bracket that can be moved in and out, one end of a rod is pivotally connected to a spring receiver located near the bracket, and the other end of the link is is pivotally connected to a part of the vehicle body frame or swing arm, the other end of the rod is pivotally connected to the middle part of the link, and when the swing arm rotates upward about the front end pivot point, The structure is such that a stopper for the bracket to come into contact with is provided at a portion where the bracket that moves together with the link due to the rotation comes into contact with the link.

(Function) With this configuration, when the rear wheel receives an upward force from the road surface and tries to compress the suspension spring, a difference occurs before and after the upper end of the suspension contacts a part of the body frame. This means that it is possible to obtain a buffering characteristic of 100%.

(Embodiment) Next, an embodiment of the present invention will be described with reference to FIG. 1. 1 is a spring type suspension;
2 is a spring. The suspension 1 absorbs the shock received by the rear wheel (not shown) by the deflection of the spring 2, and if necessary, a shock absorbing mechanism having a tube filled with air and fluid and a piston fitted into the tube is combined. . A lower end (not shown) of the suspension 1 is pivotally connected to a part of a swing arm (not shown) via a spring receiver and a bracket provided integrally with the spring receiver.

The suspension 1 is provided with a spring receiver 3 at the upper part to receive the upper end of the spring 2, and a bracket 4 is provided on the upper part of the spring receiver 3 so as to support the spring 2 in the longitudinal direction with respect to the spring receiver 3. It is provided so that it can be brought into contact with and separated from it. This bracket 4 has an arm-shaped link 5.
The lower end of is pivotally connected by a shaft 6.

The upper end of the link 5 is pivotally connected to the upper part of a vehicle body frame (not shown) by a shaft 7. The middle part of the link 5 and the spring receiver 3 have both ends attached to the shafts 8 and 9.
They are connected by a rod 10 which is pivotally connected. A stopper 11 made of rubber is provided on a part of the vehicle body frame at a portion where the bracket 4 comes into contact when the link 5 changes its posture, as will be described later.

This suspension system configured in this way compresses the suspension 1 through the swing arm when the rear wheel moves upward as the motorcycle runs, and when the rear wheel moves downward. ,
That movement will extend suspension 1. This provides a buffering effect, and with this device, a two-stage spring characteristic can be obtained as follows.

When the lower part of suspension 1 is pushed upward via the swing arm, suspension 1
While compressing the spring 2, its posture is changed so that it is tilted to the left in the figure with the pivot point to the swing arm as the fulcrum, and the lower end of the link 5 rotates clockwise with the shaft 7 as the fulcrum. , bracket 4
The part moves toward the upper left in the figure, and eventually comes into contact with a stopper 11 attached to the vehicle body frame.

As long as the upward movement transmitted to the suspension 1 via the swing arm is small and the bracket 4 does not touch the stopper 11, the upper end of the spring 2, which is pressed from below, changes its posture in relation to the rotation of the link 5. Since it is pushed downward by the changing rod 10, a progressive effect is obtained in which the stroke amount of the spring 2 is X ₁ relative to the actual stroke amount X.

Next, when the bracket 4 comes into contact with the stopper 11, from then on, like a normal suspension,
The actual stroke amount becomes the same as the stroke amount of the spring 2.

What is shown in FIG. 2 is another embodiment of the invention. In this case, the shape of the bracket 4 is different from that of FIG. 1, and the lower end of the link 5 is positioned on the left from the beginning. By doing this, the amount of movement of the rod 10 becomes larger than that shown in FIG. 1, as shown by the broken line in the figure, so that the spring 2
(X ₁
< _X2 ).

In all of the embodiments described above, the link 5 and the rod 10 are interposed between the upper end of the suspension 1 and the vehicle body side member, but in the present invention, on the contrary,
Turn suspension 1 upside down and link 5
and the rod 10 may be interposed between the suspension 1 and the axle side member (swing arm). In this way, when the movement of the swing arm is an initial slight movement, suspension 1 will not move.
Since only the link 5 moves, the so-called unsprung load seen from the vehicle body side is reduced.

(Effects of the Invention) Since the present invention has the configuration and operation described above, it has the following effects.

Two-stage spring characteristics can be obtained with a simple structure, and the stroke amount can be easily adjusted.

A larger stroke can be achieved with a smaller mechanism than conventional suspensions.

A large amount of fine movement can be achieved at the initial stage of operation.

The spring rigidity and damper can be easily adjusted.

In addition to being easy to maintain, it can be used as is on existing vehicle bodies.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the main parts of one embodiment of the invention, and FIG. 2 is a side view showing the main parts of another embodiment of the invention. 1...Suspension, 2...Spring, 3
...Spring retainer, 4...Bracket, 5...
Link, 10... Rod.

Claims (1)

[Claims] 1. Either one of the brackets provided at the upper end or lower end of the spring type suspension can be moved toward and away from the spring receiver in the longitudinal direction of the spring, and one end of the arm-shaped link is attached to the bracket that can be moved toward and away from the spring receiver. One end of the rod is pivotally connected to a spring receiver located near the bracket, and the other end of the link is pivotally connected to a part of the vehicle body frame or swing arm. The bracket is pivotally connected to the middle part, and when the swing arm rotates upward about the front end pivoting part, the bracket moves with the link due to the rotation and comes into contact with the part that comes into contact with the bracket. A suspension system for a motorcycle characterized by being provided with a stopper.