JPH05278664A - Rear wheel suspension device for motorcycle - Google Patents

Abstract

PURPOSE:To provide a rear wheel suspension device for motorcycle in which unsprung weight can be reduced and cushion performance is excellent while rigidity for holding the rear wheel is kept at high level. CONSTITUTION:An axle metal fitting 2 is tightened to the right and left rear lower ends of a frame 1, the rear end of a link bar 8 connected to a cushion unit 7 is connected to both sides of a rear wheel axle 6 on which a rear wheel 5 is pivoted rotatably, the both ends of the rear wheel axle 6 are engaged slidably with guide grooves 4 of the axle metal fittings 2, the link bar 8 is oscillated to slide the rear wheel axle 6 along the guide groove 4 to cushion the rear wheel 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear wheel suspension system for a motorcycle.

[0002]

2. Description of the Related Art Generally, a motorcycle is constructed such that both ends of a rear wheel axle, which rotatably supports a rear wheel, are fastened to the rear end of a rear fork. The front end of the rear hawk is pivotally attached to the frame, and the cushion unit is connected between the rear hawk and the frame.The cushion unit is expanded and contracted so that the rear hawk oscillates to cushion the rear wheels. There is.

[0003]

The rear fork has a heavy weight because it is made to have sufficient rigidity in order to maintain steering stability. On the other hand, it is necessary to reduce the unsprung weight of the cushion unit in order to improve the followability of the cushion of the rear wheels to the unevenness of the road surface and to improve the shock absorption.
If the rear fork is heavy and the unsprung load is large, the shock absorption is reduced, so it is difficult to achieve both the rigidity of the rear fork and the absorption of the rear wheel cushion.

In view of the above point, an object of the present invention is to provide a rear wheel suspension system of a motorcycle which can reduce the unsprung weight and has good cushioning performance while maintaining high rigidity for holding the rear wheel.

[0005]

In order to achieve the above object, a rear wheel suspension system for a motorcycle according to the present invention has an axle metal fitting fastened to the left and right lower rear ends of a frame so that the rear wheel is rotatable. Connect the rear ends of the link bars that are connected to the cushion unit to both sides of the rear-wheel axle that is pivotally supported. The rear wheel axle is slid along the guide groove to cushion the rear wheel.

[0006]

The left and right axle fittings slidably hold the rear axle, and can be made strong so that the rigidity is maintained. When the rear wheel is cushioned, the left and right axle fittings only support the rear wheel axle and have no relation to the weight of the unsprung weight. Therefore, the unsprung weight can be reduced, and the cushioning performance with good followability can be achieved.

[0007]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 6 show a first embodiment of the present invention. The frame 1 is made of a pipe material, a press plate, a cast product of a light alloy, or the like, and the axle fittings 2 are fastened to the left and right lower rear ends of the frame 1 with bolts. The axle bracket 2 has a long drive sprocket 3
An arc-shaped guide groove 4 centered on is provided. Rear wheel 5
A rear end of a link bar 8 connected to the cushion unit 7 is inserted and connected to both sides of a rear wheel axle 6 that rotatably supports the. Slide pieces 9 are fitted on both ends of the rear wheel axle 6, and the slide metal 1 is inserted between the rear wheel axle 6 and the guide groove 4 of the axle fitting 2.
The rear wheel axle 6 is slidably fitted in the guide groove 4 of the axle fitting 2 with 0 interposed.

The rear wheel axle 6 swings the link bar 8 to expand and contract the cushion unit 7, and slides up and down along the guide groove 4 of the axle fitting 2 to cushion the rear wheel 5. In the chain 11, the rear wheel axle 6 slides along the arc-shaped guide groove 4 to keep the distance between the axes constant, thereby eliminating the expansion and contraction of the chain 11. Further, the axle fitting 2 has the long hole 12
Tighten the frame 1 so that the position can be adjusted back and forth.
The elongation of 1 can be adjusted. Along with this, the link bar 8 is also provided with a portion such as a turnpuckle type whose length can be adjusted. On the other hand, if the length can be adjusted on the chain 11 side by using a chain tensioner or the like, the position of the axle fitting 2 and the link bar 8 need not be adjusted.

FIG. 7 shows a second embodiment of the present invention. In this case, the place where the link bar 8 of the cushion unit 7 passes is changed to the lower side. Others are shown in Figure 1.
Through are the same as those shown in FIG.

FIG. 8 shows a third embodiment of the present invention. In this case, the left and right axle fittings 2 are extended to the front side and fastened to the frame 1, and the frame 1 is shortened accordingly. Others are the same as those shown in FIGS. 1 to 6.

[0011]

As described above, since the present invention is configured as described above, the left and right axle fittings 2 can be made strong and the rear wheel 5 can be held with high rigidity. And
The left and right axle brackets 2 slidably hold the rear wheel axle 6, and regardless of the unsprung weight of the cushion unit 7 of the rear wheel 5, the unsprung weight can be lightened and the road surface followability is improved. It can have good cushioning performance. Moreover, since the frame is fixed, the muffler can be easily attached.

[Brief description of drawings]

FIG. 1 is an overall side view showing a first embodiment of the present invention.

FIG. 2 is a side view of a frame and axle fittings showing a first embodiment of the present invention.

FIG. 3 is a plan view of a frame and axle fittings showing a first embodiment of the present invention.

FIG. 4 is a partial plan view showing the first embodiment of the present invention.

FIG. 5 is a side view of an axle fitting portion showing the first embodiment of the present invention.

FIG. 6 is a sectional view of a rear wheel axle portion showing a first embodiment of the present invention.

FIG. 7 is an overall side view showing a second embodiment of the present invention.

FIG. 8 is a side view of an axle fitting portion of a frame showing a third embodiment of the present invention.

[Explanation of symbols]

 1 frame 2 axle bracket 4 guide groove 5 rear wheel 6 rear wheel axle 7 cushion unit 8 link bar

Claims (1)

[Claims] 1. A left and right lower rear end of a frame is fastened with axle metal fittings, and the rear wheel is rotatably supported on both sides of a rear wheel axle.
Connect the rear end of the link bar connected to the cushion unit, slidably fit both ends of the rear wheel axle into the guide groove of the axle metal fitting, and swing the link bar to slide the rear wheel axle along the guide groove. A rear-wheel suspension system for a motorcycle, wherein the rear-wheel suspension system is configured to be moved to cushion the rear wheels.