JPS602074Y2 - motorcycle rear hawk - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of the rear hawk of two-wheeled vehicles such as motorcycles.

When the rear fork of a two-wheeled vehicle is made of a steel tube, as shown in FIG. 1, the rear ends of the left and right rear forks 1 are crushed with a press to form a flat part 2, and an axle mounting hole 3 is provided in the center of the flat part 2.

In that case, as shown in Figures 2 and 3, the rear hawk 1
A reinforcing tube 4 is inserted into the rear end, and the reinforcing tube 4 is also crushed together with the rear end of the rear fork 1 to thickly reinforce the flat part 2.

The rear fork 1 and the reinforcing tube 4 are then spot welded 5 at the flat part 2 and welded together to increase the strength. When spot welding 5 is performed, a current flows through the rear fork 1, as shown by the arrow in Figure 3. Therefore, there is a problem that sufficient current does not flow to the spot portion and spot welding 5 cannot be performed reliably.

This invention has been improved in view of these points, and the embodiments of the invention shown in FIGS. 4 to 6 will be described below.

Slits 6 are provided above and below the rear ends of the left and right rear forks 1 made of steel pipes.

Then, a reinforcing tube 4 is inserted into the rear end of the rear fork 1, and crushed from side to side with a press machine to form a flat part 2.

The reinforcing tube 4 is fixed to the rear fork 1 by spot welding 5 at appropriate intervals on the flat part 2.

An axle mounting hole 3 is bored in the center of the flat part 2.

The effect will be explained.

The slit 6 serves as a guide for the fold when the flat part 2 is created by crushing the rear end of the rear fork 1 and the reinforcing tube 4 with a press.
It can be reliably folded into two, and the precision of the flat portion 2 can be increased.

When the rear fork 1 and the reinforcing tube 4 are spot welded 5 at the flat part 2, the rear end of the rear fork 1 is cut by the slit 6, so that the spot current does not detour.

Therefore, the spot points can be reliably welded, and the rear Hawk 1
The reinforcing tube 4 can be firmly fixed to the.

As explained above, this idea involves providing slits at the top and bottom of the rear end of the rear fork made of steel pipe, inserting a reinforcing tube inside the slit, and moving the rear end of the rear fork from side to side along with the reinforcing tube. Crush it into a flat part and make an axle mounting hole in the center.
Since the rear end of the rear fork and the reinforcing tube are spot welded, the slit serves as a guide when the flat part is crushed, and there is no distortion of the flat part, making it possible to improve the accuracy of the flat part.

When spot welding the reinforcing tube to the rear fork at the flat part, the spot current does not bypass the rear fork, ensuring reliable welding and high rigidity.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the rear fork, Figs. 2 and 3 show a conventional example, Fig. 2 is a side view of the part indicated by arrow A in Fig. 1, Fig. 3 is a rear view of the same, and Figs. Fig. 6 shows an embodiment of the present invention, Fig. 4 is a perspective view of the rear end of the rear fork before crushing, Fig. 5 is a side view of the part indicated by arrow A in Fig. 1, and Fig. 6 is the rear side of the same. It is a diagram. 1... Rear fork, 2... Flat part, 3... Axle mounting hole, 4... Reinforcement tube, 6... Slit.

Claims (1)

[Scope of utility model registration request] Slits are provided at the top and bottom of the rear end of the rear fork made of steel pipes, a reinforcing tube is inserted inside the slit, and the rear end of the rear fork is crushed from side to side along with the reinforcing tube to form a flat part with an axle in the center. The rear fork of a motorcycle is characterized by having a mounting hole and spot welding the rear end of the rear fork to the reinforcing tube.