JPS6337754B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a front wheel shock absorber for a motorcycle in which a shock absorber is separated from a steering system and disposed on a vehicle body frame.

In the shock absorbers of this type of motorcycle, the shock absorbers have conventionally been attached to the steering system, so that when the steering wheel is operated, the shock absorbers also move. As a result, the steering system tends to become heavier, and the steering moment of inertia also increases.

Furthermore, depending on the model of the front wheel shock absorber, the shock absorber is located at the upper part of the vehicle body, making it difficult to set the center of gravity of the vehicle at a preferable position.

The present invention has been made to effectively eliminate such problems, and its purpose is to reduce the steering moment of inertia and the center of gravity of the vehicle by reducing the weight of the steering wheel, thereby making it easier to operate the steering wheel. To provide a front wheel shock absorber for a motorcycle which can be made lightweight and improve handling stability.

In order to achieve such an object, the present invention includes a sliding member that is slidably fitted into a head pipe, and the lower end of which is connected via a bearing head to a rod member that suspends a front wheel. Its feature is that the engine and the shock absorber disposed on the vehicle body frame are connected via a swingably pivoted crank member.

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

FIG. 1 is a side view of a motorcycle equipped with a shock absorber according to the present invention, FIG. 2 is a perspective view of the shock absorber, and FIG.
The figure is a cutaway front view of the bearing head.

A body frame 2 of a motorcycle 1 shown in FIG. 1 is composed of a main frame 3, a down tube 4, a rear frame 5, a reinforcing frame 6, etc., and an engine 7 is mounted and supported on the body frame 2. Also, the rear fork 8 is mounted on the body frame 2.
The front end of the rear fork 8 is pivotally mounted on a pivot shaft 9 so as to be vertically swingable, and a rear wheel 10 is rotatably supported on the rear end of the rear fork 8, as shown in the figure. A rear wheel shock absorber 11 is installed between the rear fork 8 and the vehicle body frame 2, and the shock transmitted from the rear wheel 10 side is effectively absorbed and alleviated by the shock absorber 11.

On the other hand, the front wheel suspension system 20 serving as a front fork has an upper fork 21 and a lower fork 22, the upper end of which is pivotally connected to the lower end of the upper fork 21 with pins 23 and 24, and the lower end of which is connected to the lower fork 22 with a pin 25. , 26, and a tension rod 28.

The upper fork 21 is held at the front end of the vehicle body frame 2 by upper and lower bridges 13 and 14 so that it can be steered left and right, and the steering operation is performed by a handle 29. Further, the lower fork 22 rotatably supports the front wheel 12 at its front end.

In the suspension system 20 described above, the upper fork 21 is a fixed link, whereas the lower fork 22, middle arm 27, and tension rod 28 are movable links, and these constitute a side quadrilateral link mechanism.

By the way, as shown in detail in FIG. 2, a rod-shaped sliding member 31 is slidably fitted into the head pipe 30, and the lower end of the sliding member 31 is connected to the compression rod via a bearing head 32. Do33
is connected to the top of the The lower end of the compression rod 33 is pivotally connected to the middle of the middle arm 27, as shown in FIG.

The lower end of the sliding member 31 is connected to a bearing head 32 via thrust bearings 34, 34 as shown in FIG.
9, the upper fork 21, bearing head 32, and compression rod 33 are activated.
Even if the slide member 31 rotates left and right, the sliding member 31 does not rotate. In addition, 35 in FIG. 3 is a bump rubber.

On the other hand, a lower end of a front wheel shock absorber 40 is pivotally connected to the vehicle body frame 2. Note that this shock absorber 40 is a normal hydraulic shock absorber.

Thus, the intermediate portion of the sliding member 31 and the buffer 40
The upper end of the piston rod 41 is the bell crank 4.
2, and an intermediate position of the bell crank 42 is pivotally connected to the vehicle body frame 2 via an idler arm 43. In the above, in order to connect the bell crank 42 and the sliding member 31, for example, an opening is provided that penetrates the head pipe 30 in a substantially radial direction and allows the operation of the bell crank 42, and the bell crank 42 is inserted into the opening. It is configured so that it can be inserted.

Next, the operation of this front wheel shock absorber will be explained.

When the front wheel 12 moves up and down, the upper fork 21, lower fork 22, middle arm 27, and tension rod 28 that make up the side quadrilateral link are deformed, and this deformation action causes the compressor that connects the lower end to the middle arm 27. The shaft rod 33 moves up and down. This vertical movement of the compression rod 33 causes the bearing head 3 to
2 through the compression rod 3.
A sliding member 31 connected to the head pipe 3 also slides up and down within the head pipe 30.

The sliding movement of the sliding member 31 within the head pipe 30 is converted into a swinging motion of a bell crank 42 that connects one end of the sliding member 31 to the sliding member 31, and this swinging motion of the bell crank 42 is bell crank 4
This is converted into an up and down movement of the piston rod 41 of the shock absorber 40 whose upper end is connected to the other end of the shock absorber 40, and finally the shock absorber 40 is activated. Due to the buffering action of the shock absorber 40, the shock transmitted from the front wheel 12 side is effectively absorbed and alleviated, thereby improving riding comfort.

In the above, since the front wheel shock absorber 40 is separated from the steering system and disposed on the vehicle body frame 2 side, it is possible to reduce the weight of the steering system by the weight of the shock absorber 40, which makes it easier to steer the steering wheel 29. It is possible to lower the steering inertia moment of the associated steering system,
As a result, the steering operation of the handle 29 becomes easier.

In addition, the center of gravity of the vehicle can be lowered, especially compared to a type in which the shock absorber is disposed on the upper part of the vehicle body.

Next, a modified embodiment of the present invention is shown in FIG. 4. In this embodiment, a sliding member 131 is slidably inserted into the head pipe 130, and a bell crank 142 is arranged on the upper part of the vehicle body frame 102. The upper end of the sliding member 131 and the bell crank 142
It is connected to one end of.

The same effects obtained in the first embodiment can also be obtained in this modified embodiment.

As is clear from the above description, according to the present invention, a sliding member is slidably fitted into the head pipe, and the lower end of the sliding member is connected via a bearing head to a rod member that suspends the front wheel. Since the moving member and the shock absorber disposed on the vehicle body frame are connected via a swingable crank member, the weight of the steering system can be reduced, and the center of gravity of the vehicle can be lowered. The steering wheel can be operated easily and the steering stability can be improved.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of a motorcycle equipped with a shock absorbing device according to the present invention, FIG. 2 is a perspective view of the shock absorbing device, and FIG. 3 is a fractured view of the bearing head. The front view and FIG. 4 are side views of the front portion of a motorcycle equipped with a shock absorber according to a modified embodiment. In the drawing, 1 is a motorcycle, 2, 102 is a body frame, 12 is a front wheel, 20 is a front wheel suspension system, 21
is hot oak, 22 is lower fork, 2
7 is middle arm, 28 is tension rod, 2
9 is the handle, 30,130 is the head pipe, 3
1, 131 is a sliding member, 32 is a bearing head, 33 is a compression rod, 40 is a front wheel shock absorber, 42, 142 is a bell crank, and 43 is an idler arm.

Claims (1)

[Claims] 1 A sliding member is slidably fitted into the head pipe, and the lower end of the sliding member is connected via a bearing head to a rod member that suspends the front wheel, and a shock absorber is installed between the sliding member and the vehicle body frame. 1. A front wheel shock absorber for a motorcycle, characterized in that the front wheel shock absorber for a motorcycle is connected to the front wheel via a swingably pivotally mounted crank member.