JPH04271984A - Front wheel suspension device for motorcycle - Google Patents

Abstract

PURPOSE:To improve the straight advance performance of a vehicle by setting a front wheel in slight eccentric to the side where a disc brake is installed, in the constitution in which the disc brake is installed on one side of a front wheel. CONSTITUTION:A head pipe 2 is installed at the front edge of a frame 1, and the steering shaft at the center of a front fork 3 is installed so as to be turned and steered. Further, the brake disc 8 of a disc brake 10 is installed on one side of a front wheel 6 supported at the lower edges of the left and right fork shafts 5 of the front fork 3, and a brake caliper 9 is installed on the left side of the fork shaft 5. In such a suspension device, the front wheel 6 is arranged in slightly eccentric state from the car body center on the side where the disc brake 10 is installed. Accordingly, when a vehicle travels, the car body shows the tendency to be inclined to the opposite side to the side where the disc brake 10 is installed, and high straight advance performance is obtained.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front wheel suspension system for a motorcycle in which a disc brake is mounted on one side of the front wheel.

0002

[Prior Art] A motorcycle has an axle that rotatably supports the front wheel attached to the lower end of the front fork, which is rotatably attached to the head pipe at the front end of the frame, and can run by steering the front fork left and right with a handlebar. That's what I do. A disc brake may be installed on one side of the front wheel. Disc brakes apply braking by sandwiching a brake disc, such as a stainless steel plate, attached to one side of the front wheel between the front forks.The brake disc is thick and heavy, causing an imbalance in the left and right weight of the front wheel.

[0003] Also, depending on the mounting position of a heavy engine, the center of gravity may be to the side of the vehicle body center line, or if the front wheels are cantilevered and the center of gravity is to the side, the front wheels may be offset. . For example, Tokuho 2-142
See Publication No. 33 and Japanese Patent Publication No. 63-7993.

0004

[Problem to be Solved by the Invention] When a disc brake is attached to one side of the front wheel and becomes heavy, the center of gravity of the traveling system is cut toward the disc brake side if the front wheel is located at the center of the vehicle body. However, the front fork has a caster angle and a trail to improve straight-line performance, so when the handlebars are notched toward the disc brake, the vehicle body leans toward the opposite side of the disc brake. This causes the problem that the steering wheel turns in the opposite direction from the disc brake.

[0005] In view of this point, the present invention is to attach a disc brake to one side of the front wheel, and by making the front wheel slightly eccentric from the center line toward the side to which the disc brake is attached, it is possible to maintain straight running performance. The purpose is to obtain a front wheel suspension system for a motorcycle.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the front wheel suspension system for a motorcycle of the present invention has a front wheel that rotates at the lower end of the front fork rotatably attached to a head pipe at the front end of the frame. It is mounted on a freely supported axle, with a disc brake attached to one side of the front wheel, and the front wheel is slightly eccentric to the side where the disc brake is attached with respect to the center line of the front fork.

[0007]

[Operation] By making the front wheels slightly eccentric to the side where the disc brake is installed, the front wheels can absorb the force caused by the slip angle of the front wheels to direct the front wheels in the direction of travel, and the grounding point of the front wheels to match the trail point of the vehicle. The force that tries to bring the rear wheels closer to the line connecting the grounding points is balanced by the turning angle of the front wheels, where it becomes stable, and the front wheels try to move toward the side where the disc brakes are installed, but the vehicle uses the disc brakes to maintain straight forward movement. It is possible to maintain balance by tilting to the opposite side to the side where it is installed, and maintain straight forward movement.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be explained with reference to FIGS. 1 and 2. Head pipe 2 installed at the front end of frame 1
Attach the front fork 3 so that it can be steered by rotating the central steering shaft. A handle 4 is attached to the upper end of the front fork 3 so as to protrude left and right to enable steering. An axle 7 that rotatably supports a front wheel 6 is passed through and fastened to the lower ends of the left and right fork shafts 5 of the front fork 3.

A brake disc 8 of a disc brake is attached to one side (the left side in the figure) of the front wheel 6. Further, a brake caliper 9 is attached to the left side of the hawk shaft 5 so that the brake disc 8 is sandwiched between the brake caliper 9 and brake is applied, and the brake disc 8 and the brake caliper 9 constitute a disc brake 10. and,
Set the front wheel 6 slightly to the side where the disc brake 10 is installed.
Make the dimensions eccentric from the center of the vehicle body. To make the front wheel 6 eccentric, the length of the collar 12, which is sandwiched between the hub 11 of the front wheel 6 and the left and right hawk shafts 5 and passes through the axle 7, may be changed.

The front wheel 6 is heavier on the side where the disc brake 10 is attached, and the front fork 3 tries to break on the side where the disc brake 10 is attached at first, but when the front wheel 6 is placed on the side where the disc brake 10 is attached from the center line of the vehicle body. By making the vehicle eccentric, it is possible to maintain straight-line performance even when the vehicle body tends to tilt toward the side opposite to the side to which the disc brake 10 is attached.

[0011]

[Effects of the Invention] As explained above, since the present invention is constructed as described above, the front wheel is heavier by attaching a disc brake to one side of the vehicle, and the front wheel is moved from the center line of the vehicle body to the side to which the disc brake is attached. By making it slightly eccentric, a force is exerted that tends to tilt the vehicle body toward the side opposite to the side where the disc brake is attached, allowing the front fork to maintain its straightness. To make the front wheels eccentric, you can easily do this by adjusting the length of the collar inserted into the axle.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a side view showing an embodiment of the present invention.

[Explanation of symbols]

1 frame. 2 Head pipe. 3.Mae Hawk. 6. Front wheel. 7 Axle. 10 Disc brake.

Claims (1)

[Claims] Claim 1: An axle that rotatably supports the front wheel is attached to the lower end of the front fork rotatably pivoted to the head pipe at the front end of the frame, a disc brake is attached to one side of the front wheel, and the center of the front fork is attached to the lower end of the front fork. A suspension system for a motorcycle characterized by having a front wheel slightly eccentric to the side where a disc brake is attached with respect to the line.