JPS58194679A - Link type rear suspension for two-wheel barrow, etc. - 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 The present invention relates to improvements in link type rear suspensions for motorcycles and the like.

In motorcycles, etc., when the rear wheel support frame, which supports the rear wheel at the rear end and whose front end is pivoted to the vehicle body frame so as to be able to swing up and down, swings upward due to the upward movement of the rear wheel due to road surface undulations, the rear wheel A link-type rear suspension is known that constitutes a so-called progressive link mechanism in which the damping force generated by a shock absorber that absorbs and alleviates upward shock gradually increases in a quadratic curve with respect to the amount of rocking of the rear wheel support frame. ing.

Conventionally, this type of link suspension includes a lever member whose one end is pivotally connected to the rear wheel support frame so as to be vertically movable, and whose other end is connected to the lower end of the shock absorber. Since the structure consisted only of a link member that pivotally connects the shock absorber, the entire compression stroke of the shock absorber relative to the upward stroke of the rear wheel was sufficiently thick (it was not possible to take the entire compression stroke of the shock absorber), which resulted in problems with ride comfort and ground contact of the rear wheel with respect to the road surface. There was still room for improvement.

In addition, since there are few load support points on the body frame and rear wheel support frame, large loads are concentrated on these support points. As a result, these components were subject to high loads, which hindered efforts to reduce the weight of the vehicle body.

The present inventor has developed the present invention by paying attention to this point, and the purpose thereof is to provide a link A to the rear wheel support frame.
One end of each link B is rotatably connected, and the other end of link A is pivotally connected to the rear end of link C, whose front end is pivotally connected to the vehicle body frame. By pivotally connecting the end to the lower part of the shock absorber and connecting the link Di between the lower part of the shock absorber and the pivot point of link A and link C, the compression stroke of the shock absorber relative to the upward stroke of the rear wheel is reduced. It is sufficiently thick (can be made thicker) to improve ride comfort and the ability of the rear wheels to follow the road surface, and to increase the load support points of the body frame and rear wheel support frame to reduce the impact that the rear wheels receive at these points. By distributing the load, the weight of the vehicle body frame and rear wheel support frame is reduced, and all glue/glue type rear suspensions for motorcycles and the like are provided.

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 link type suspension disposed at the rear of a motorcycle, and Fig. 2 is a perspective view of the same suspension.

In the figure, reference numeral 1 denotes a vehicle body frame.The front end of a rear fork 2, which is a rear wheel support frame, is pivoted to the vehicle body frame 1 by a pivot shaft 3 so as to be able to swing vertically. A rear wheel 4 is rotatably supported by a rear axle 5.

As shown in the figure, one ends of links A, A are rotatably pivoted on both left and right outer sides of the front side of the rear fork 2.
Further, one end of a link B is rotatably attached to the rear fork 2.

On the other hand, the front ends of left and right links C, C are rotatably mounted below the pivot shaft 3 of the vehicle body frame 1.
, C, and these links C10''rear end'''9 above.
″1・A(D*k(1) other end 1 pivot connection,・9 connection d,
d has been done.

Further, as shown in the figure, the upper end of a shock absorber 6 is pivotally attached to the vehicle body frame 1 (e), and the lower end of the shock absorber 6 is pivotally attached to the other end of the link B as shown in the figure. Furthermore, links D and D are constructed and connected between the lower end of this buffer 6 and the pivot points d and d of the links A and A and links C and C, respectively.

When the rear wheel 4 moves upward and the rear fork 2 that supports it rotates counterclockwise around the pivot shaft 3 by an angle θ as shown in FIG. Link A is pivoted at one end.

Pivot points a, a, and b of link A and link B rotate by the same angle θ in the same direction and move to points a/, a/, and b' in the figure, respectively.

If all the moving points of the other pivot points d, d and f are plotted geometrically, these will be d', d', 0, respectively, as shown in Figure 1.
It will be 7 points.

(Thus, the lower end pivot point f of the shock absorber 6 is located at the point f' due to the rotation of the rear fork 20 by an angle θ in the counterclockwise direction due to the upward movement of the rear wheel 4.
As a result, the shock absorber 6 is compressed by a stroke ΔS, and a damping force commensurate with the stroke ΔS is generated.

The compression stroke ΔS of the shock absorber 6 is larger than that obtained with a conventional link suspension due to the increase in the number of links, and therefore the ride comfort and the ground contact of the rear wheels 4 to the road surface can be further improved. .

In addition, the impact load that the rear wheel 4 receives is borne at the three pivot points a, a, and b for the rear fork 2, and at the three pivot points e, f, and f for the vehicle body frame 1. Load distribution is achieved, and large loads are not concentrated at local points. As a result, the vehicle body frame 1 and the rear fork 2 can maintain sufficient strength and rigidity even if they are formed into thin walls, and as a result, the weight of these members can be reduced.

Furthermore, both ends of each link A, A, B, C, C, D, and D are pivotally connected for free rotation, and since these rotate only in the vertical direction, each link is subject to tensile and compressive loads. Therefore, these links are advantageous in terms of strength and rigidity, and as a result, the shape and weight of these links can be simplified.

Furthermore, since each link A, A, B, C, C, D, and D is arranged at the bottom of the vehicle body and near the vehicle's center of gravity, it is possible to centralize mass and lower the center of gravity, further improving steering stability. .

The present invention exhibits the effects described above.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of a tall link type rear suspension disposed at the rear of a motorcycle, and FIG. 2 is a perspective view of the same suspension. In the drawing, 1 is the body frame, 2 is the rear fork, 3 is the pivot shaft, 4 is the rear wheel, 6 is the shock absorber, A, B, C,
D is a link. Patent applicant Honda Motor Co., Ltd.

Claims (1)

[Claims] A rear wheel support frame that supports a rear wheel at the rear end and pivots the front end to a body frame so as to be able to swing up and down, and a shock absorber is pivotally connected to the body frame via a link. In the link type rear suspension, one end of each of link A and link B is rotatably connected to the rear wheel support frame, and the other end of link A and the front end of link C are pivotally connected to the vehicle body frame. Link B
The other end is pivotally connected to the lower part of the shock absorber, and a link Dt is connected between the lower part of the shock absorber and the pivot connection point of the link A and the link C.
- Link-type rear suspension for two-wheeled vehicles, etc., characterized by an erection connection.