JPS60110589A - Rear fork for 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] Misfire J concerns the improvement of rear forks for motorcycles.

It is supported so that it can be adjusted in the front and back direction. Specifically, a separately processed end piece is fixed to the end of the square fork pipe by welding, and a chain adjuster can be slid freely within the square space at the end. It was stored in a container, and the terminal end was crushed.

However, if the end piece is provided inside the terminal end, the seat surface of the axle nut that is fastened to the axle shaft will be inside the outside surface of the fork pipe, so the axle shaft can be shortened, but this requires separate machining.・Since no piece is required, the cost is high (and if the chain adjuster is housed in the rectangular space at the end, the width (thickness) of the chain adjuster is large, which increases the weight, and the axle shaft must be shortened ( Furthermore, it was difficult to crush and add the terminal end with a rectangular fork vibrator, and there were many other limitations.

The present invention has been made to solve the above-mentioned conventional problems all at once, and its purpose is to shorten the rear wheel axle shaft by making the terminal end of the rectangular fork pipe more compact, and to improve the length of the chain adjuster. It also achieves weight reduction by reducing the width (thickness) of the material, reduces costs because it does not require separately processed parts, and is also good in terms of manufacturing because it does not require difficult crushing processing. We provide rear forks for motorcycles.

In order to achieve such an object, the present invention provides a partition wall in the terminal end of a rectangular fork pipe that constitutes the rear fork of a motorcycle, divides the pipe into left and right chambers, and opens the chamber outside the partition wall to external forces. At the same time, a chain adjuster is slidably stored in the inner chamber to support the rear wheel axle shaft so as to be adjustable in the longitudinal direction, and a chain adjuster is stored in the outer chamber at the end of the rear wheel axle nut. The main point is to tighten the axle nut.

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

Figure 1 is a perspective view of the rear fork, Figure 2 is a plan view showing the axle shaft support structure at the end of the square fork pipe, and Figure 3 is a side view showing the nut. be.

As shown in FIG. 1, the left and right fork pipes 2 and 3 of the rear fork 1 are square pipes, and both square fork pipes 2 and 3 are square pipes.
, 3 are connected at the front by a cross member 4. Since the structure of this bigonal fork pipe 2゜3 is the same,
The structure of only one will be explained below.

In the present invention, a partition wall 6 is integrally formed in the left and right center portions of the end portion 5 of the square fork pipe 2, as shown in FIG. 2 and FIG. Rooms 7 and 8
partition into. In the illustration, the chambers 7 and 8 are vertically long.

)v [The terminal portion 5 has no outer wall,
The outer wall 9 of the fork pipe 2 is formed in front of the terminal end 50, so that the chamber 7 outside the partition wall 6 is open to the outside through a window 10. Also, the upper and lower walls lL12 of the outer chamber 7 are the third
As shown in FIG. 5, which is a cross section taken along the line V-V, the outer edge 11a is designed to reduce the amount of protrusion toward the rear end 13.
, 12a are formed obliquely.

The square fork pipes 2 and 3 described above are obtained by extrusion molding of aluminum or the like.

Elongated holes 15 and 16 are formed in the partition wall 6 and the inner wall 14 of the terminal end portion 5 in the front-rear direction, and a plate-shaped chain adjuster 20 is slidably inserted into the chamber 8 inside the partition wall 6. Insert the rear wheel axle shaft 3 from the long hole 16 of the inner wall 14.
o, pass through the medium circular hole 21 of the chain adjuster 2o, and project the threaded part 31 formed at the end of the axle shaft 3° outward through the elongated hole 15 of the partition wall 6. do.

Here, the chain adjuster 2o is connected to the elongated hole 15.16.
More sufficiently long in the front and rear direction (1, lFK protruding protrusion 22
, 23 are slidable on the upper and lower walls 17, 18 of the inner chamber 8 (11), and an adjustment rod 24 protrudes from the rear end of the adjuster 2o.
The threaded portion 25 at the rear end of this rod 24 is connected to the circular hole 19 of the end play 1, 19 which is fixed to the inner chamber 8 along with the rear end 13.
It penetrates through a and protrudes rearward, and a double knife 1-26, 27 is fastened to this threaded portion 25.

After adjusting the position of the rear wheel axle shaft 30 using the chain adjuster 2o in this manner, the flat washer 32 is interposed on the threaded portion 31 at the end of the axle shaft 3, and the axle nut 33 is fastened.

If a rubber gap 40 is fitted between the outer wall 9 facing the outer chamber 7 and the partition wall 6, this portion can be closed and sealed.

As shown in Figure 2, since the seat surface of the axle nut 330 is placed closer to the partition wall 6 on the inside than the outside wall 9 of the rectangular fork pipe 2, the rear wheel axle shaft 3o can be shortened, and the chain adjuster 20 can also be moved closer to the right side. Since it is only necessary to store it in the chamber 8, the width (thickness) of the adjuster 20 can be reduced (less than half that of the conventional one) and the weight can be reduced. In addition, since there is no need for an end piece that is processed separately as in the past, the cost is reduced, and the manufacturing process is easy because difficult crushing processing is not required.

As is clear from the above description, according to the present invention, the rear end of the rectangular fork pipe can be made more compact, the rear wheel axle shaft can be shortened, and the weight of the chain adjuster can be reduced at the same time, reducing costs. It has advantages such as being cheap and easy to manufacture.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the rear fork, Fig. 2 is a plan view showing the axle shaft support structure at the end of the square fork pipe, Fig. 3 is a side view of the same without the nut shown, and Figs. 4 and 5. FIG. 2 is a sectional view taken along lines RV-W and V-V in FIG. In the drawing, 1 is a rear fork, 2 and 3 are square fork pipes, 5 is its terminal end, 6 is a partition wall, 7°8 is a chamber, 10 is a window, 14 is an inner wall, 15.16 is a long hole, 20 is the chain adjuster, 24 is the rod, 26.27 is the double nand, 30 is the rear wheel axle shaft', 33 is the axle nut l-,
40 is ComCap. Applicant Honda Motor Co., Ltd. Agent Patent Attorney 2 1) Yu-Duma Patent Attorney Kuni Ohashi Production Volume Patent Attorney Yu Koyama

Claims (1)

[Claims] In a rear fork of a motorcycle that supports a rear wheel axle shaft at the end of a square fork pipe, the inside of the end of the square fork pipe is divided into left and right chambers by a partition wall, and the chamber outside the partition wall is directed outward. The chain adjuster is slidably housed in the inner chamber, and the rear axle +IQl+ is supported so as to be adjustable in the longitudinal direction through the chain adjuster.
: A motorcycle fork characterized by having an axle nut fastened to the part.