JPS59109485A - Shock absorber for front wheel of motorcycle - 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 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.

Conventionally, in the shock absorbers of this type of motorcycle, the shock absorbers were attached to the steering system, so when the steering wheel was operated, the shock absorbers also moved. As a result, the steering system tends to be heavy, and the steering moment of inertia is also large (which affects steering operation).

Furthermore, depending on the model of the front wheel shock absorber, the shock absorber is disposed at the upper part of the vehicle body, making it difficult to set the center of gravity of the vehicle at a position that is favorable for driving stability.

The present invention has been made to effectively eliminate such problems, and its purpose is to reduce the steering inertia moment and the center of gravity of the vehicle by reducing the weight of the steering wheel. To provide a front wheel shock absorber for a motorcycle that can be easily operated and completely improves handling stability.

To achieve all of these objectives, the present invention includes a sliding member slidably fitted into a head pipe, the lower end of which is connected via a bearing head to a rod member that suspends a front wheel, and the sliding member The main feature of the engine is that it is connected to a shock absorber disposed on the vehicle body frame via a swingably pivoted crank member.

A preferred embodiment of the present invention will be described in detail below with reference to all 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. 3 is a cutaway front view of a 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 body frame 2
The front end of the rear fork 8 is pivotally mounted on a pivot shaft 9 so as to be able to swing up and down, and a rear wheel 10 is rotatably supported on the rear end of the rear fork 8 as shown. A rear wheel shock absorber 1 is installed between the rear fork 8 and the vehicle body frame 2.
1 is installed, and due to the buffering effect of the shock absorber 11, the rear wheel 10
The impact transmitted from the side ρ is effectively absorbed and relaxed.

On the other hand, a front wheel suspension system 20 serving as a front fork
is an upper fork 21, a lower fork 22, and the upper end is attached to the lower end of the upper fork 21 with a bin 23.24.
The lower end is pivotally connected to the lower fork 22 with a pin 25.
It is composed of a middle arm 27 and a tension rod 28 which are pivotally connected at 26.

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

In the above suspension system 20, the upper fork 21
becomes the fixed link, and 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, a rod-shaped sliding member 31 is slidably fitted into the head pipe 30 as shown in detail in FIG. It is connected to the upper end of the compression rod 33.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 the bearing head 32 via a thrust bearing 34, 34'e as shown in FIG. Even if the compression rod 33 and the like rotate 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.

The intermediate portion of the sliding member 31 and the upper end of the piston rod 41 of the shock absorber 40 are connected by a bell crank 42, and the intermediate position of the bell crank 42 is connected to the vehicle body frame 2 via an idler arm 43. It is pivotally connected to.

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 forming the side quadrilateral link tm deform and operate.
Due to this deformation operation, the compression rod 33 whose lower end is connected to the middle arm 27 moves up and down. This vertical movement of the compression rod 33 causes the lower end of the compression rod 3 to be compressed through the bearing head 32.
A sliding member 31 connected to the head pipe 3 also slides up and down within the head pipe 30.

The sliding of the sliding member 31 within the head pipe 30 is controlled by the bell crank 4 whose one end is connected to the sliding member 31.
This swinging motion of the bell crank 42 is converted into the vertical motion of the piston rod 41 of the shock absorber 40, which connects its upper end to the other end of the bell crank 42, and finally The buffer 40 is activated. The shock transmitted from the side of the front wheel 12 is effectively absorbed and alleviated by the buffering action of the shock absorber 40, 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, the steering system is connected to the shock absorber 40.
The weight can be reduced by the amount of N, which reduces the steering moment of inertia of the steering system due to the steering operation of the steering wheel 29.
4- As a result, the steering operation of the steering wheel 29 becomes easier and the steering stability improves.

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

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 at the upper part of the vehicle body frame 102. , connects the upper end of the sliding member 131 and one end of the bell crank 142.

Therefore, the same effects as those of the first embodiment can be obtained in this modified embodiment as well.

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 sliding member and the shock absorber installed on the vehicle body frame are connected via a swingably pivoted crank member, the weight of the steering system can be reduced, and the center of gravity of the vehicle can be lowered. This makes it easier to operate the steering wheel and improves steering stability.

[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 absorber according to the present invention, FIG. 2 is a perspective view of the shock absorber, 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 addition, 1 in the drawing is a motorcycle, 2,102 is a body frame,
12 is a front wheel, 20 is a front wheel suspension system, 21 is a half oak, 22 is a lower fork, 27 is a middle arm, 2
8 is the tension rod, 29 is the handle, 30.1
30fl head pipe, 31° 131 is a sliding member, 32
is the bearing head, 33 is the compression rod,
4o is front wheel shock absorber, 42.142 is bell crank, 4
3 is an idler arm. Patent Applicant: Honda Motor Co., Ltd. Representative Patent Attorney 2) 1) Sales Department

Claims (1)

[Claims] 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 provided 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.