JPS6242871Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an axle mounting structure for a front fork of a motorcycle or the like.

The front forks of motorcycles, etc. are suspended diagonally relative to the vehicle body, so they are subject to side forces.As a result, when the inner and outer cylinders slide, there is a certain amount of frictional resistance between them, which hinders smooth operation. Another problem is that it cannot follow minute changes in the road surface, and the impact is transmitted onto the spring.

In view of the above-mentioned disadvantages of this type of front fork, the present inventor devised the present invention in order to effectively solve the problem. At the same time, a rod is slidably inserted into the hole, an axle mounting bracket is screwed to one end of the rod, and a nut is screwed to the other end via a washer, so that the rod is inserted between the axle mounting bracket and the axle bracket. By interposing an elastic body between the washer and the axle bracket, it is possible to move the axle mounting bracket in the longitudinal direction by the amount of compressive deformation of these elastic bodies, thereby reducing the friction between the inner and outer cylinders caused by the side force. To provide an axle mounting structure for a front fork that can eliminate resistance and ensure smooth operation of the front fork and good tracking of changes in the road surface.

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

FIG. 1 is a partially cutaway side view of a front fork having an axle mounting structure according to the present invention, and FIG. 2 is a partially cutaway side view of the axle mounting portion of the front fork.

In the front fork 1 shown in FIG. 1, reference numeral 2 denotes an outer cylinder, and an inner cylinder 3 is fitted into the outer cylinder 2 from above so as to be freely slidable up and down. Furthermore, on the inner periphery of the inner cylinder 3, there is provided an enlarged tip portion 4a of a seat pipe 4 which is installed concentrically with the outer cylinder 2 at the inner bottom of the outer cylinder 2 via a bolt.
are in sliding contact with each other.

An oil seal 5 and a dust seal 6 are provided at the upper end of the outer cylinder 2, and by the action of these 5 and 6, the relative sliding between the outer cylinder 2 and the inner cylinder 3 is made airtight and oil-tight, and the outer cylinder 2. Dust is prevented from entering the interior. Further, an axle bracket 7 for mounting and supporting a vehicle axle (not shown) is integrally protruded from the lower end of the outer cylinder 2, and the bracket 7 has a through hole 7a in the front-rear direction (left-right direction in the drawing) as shown. is drilled. A collar member 8 is slidably fitted into the through hole 7a as shown in detail in FIG. An axle mounting bracket 10 is screwed onto the threaded portion 9a at one end of the bolt 9 (the left end in the figure) so as to abut against the end surface of the collar member 8, and the threaded portion 9 at the other end
b (right end in the figure), a nut 11 is similarly screwed into contact with the end surface of the collar member 8 with a flat washer 12 in between.

Incidentally, the axial length l ₁ of the collar member 8 is larger than that of the axle bracket ₇ (l ₁
>l ₂ ), therefore, gaps S and S are formed between the axle mounting bracket 10 and the axle bracket 7 and between the washer 12 and the axle bracket 7 as shown in the figure, and these gaps S and S also form the outer periphery of the collar member 8. is a ring-shaped elastic body 13, 13 made of rubber or the like.
is interposed.

Thus, the lower end of the outer cylinder 2 is connected to the axle mounting bracket 1.
0 to a vehicle wheel (not shown).

On the other hand, the upper end of the inner cylinder 3 is closed with a lid 14,
A check valve 15 for generating a predetermined damping force is provided inside the valve 3 below. The upper end of this inner cylinder 3 is connected to the vehicle body side, and the outer cylinder 2
and the inner cylinder 3 move relative to each other, and the front fork 1
has the desired damping effect.

The space constituted by the outer cylinder 2 and the inner cylinder 3 described above is divided into an inner chamber _S1 of the sheet pipe and an outer chamber as shown in Fig. 1.
It is divided into S ₂ , middle chamber S ₃ and upper chamber S ₄ .
Hydraulic oil is sealed in S ₁ , S ₂ , S ₃ , and S ₄ . Furthermore, two upper and lower cushion springs 17 and 18 are stretched between the upper end of the inner cylinder ₃ and the upper end of the seat pipe 4 in the upper chamber S4, with a mesh plate 16 located in the middle as a boundary. ₃ is provided with a stopper spring 19.

In such a front fork 1, the axle mounting bracket 10 can be moved in the longitudinal direction of the vehicle by the amount of compressive deformation of the elastic bodies 13, 13, so even if the front fork 1 receives a side force, it will not be affected by the side force. The frictional resistance generated between the inner and outer cylinders 2 and 3 is effectively eliminated.
The front fork 1 is guaranteed to operate smoothly, and can also sufficiently respond to minute changes in the road surface, contributing to further improvements in ride comfort and handling stability.

In the above embodiments, the length of the collar member 8
By changing the dimensions of _l1 and the elastic bodies 13, 13, the distance between the axle mounting bracket 10 and the two axes of the outer cylinder can be adjusted.

As is clear from the above description, according to the present invention, a hole is formed in the axle bracket that mounts and supports the axle in the front and back direction, and a rod is slidably inserted into the hole, and one end of the rod is inserted into the axle bracket. The axle mounting bracket was screwed onto the other end with a nut through a washer, and elastic bodies were interposed between the axle mounting bracket and the axle bracket and between the washer and the axle bracket, so that the amount of compressive deformation of these elastic bodies was This makes it possible to move the axle mounting bracket in the longitudinal direction, effectively eliminating the frictional resistance between the inner and outer cylinders caused by the side faces, allowing for smooth operation of the front fork and good tracking of changes in the road surface. can be guaranteed.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a partially cutaway side view of a front fork having an axle mounting structure according to the present invention, and Fig. 2 shows an axle mounting part of the front fork. FIG. In the drawings, 2 is an outer cylinder, 3 is an inner cylinder, 7 is an axle bracket, 8 is a collar member, 9 is a bolt, 10 is an axle mounting bracket, 11 is a nut, 12 is a washer, and 13 is an elastic body.

Claims (1)

[Scope of utility model registration request] In a front fork comprising an axle bracket in which an inner cylinder and an outer cylinder are slidably fitted together and an axle is mounted and supported at the bottom of the outer cylinder, a hole is bored through the axle bracket in the longitudinal direction, and A rod is slidably inserted into the hole, an axle mounting bracket is screwed to one end of the rod, and a nut is screwed to the other end via a washer, so that the rod is inserted between the axle mounting bracket and the axle bracket, and between the washer and the axle bracket. An axle mounting structure for a front fork characterized by interposing an elastic body in the front fork.