JPS607989Y2 - Bearing device for rear forks in motorcycles - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bearing device for the front end of a rear fork of a motorcycle, which is pivoted to the rear of a vehicle body frame, and particularly to a rear fork bearing device of a type in which the left and right bearing portions are separated.

To explain the drawings, 1 is the vehicle body frame, 2 is the rear fork, 3 is the rear wheel, 4 is the engine, and 5 is the seat. Place it between brackets 7 and 7 of
Insert the engine mounting bracket 8 between the pair of bearings 6, 6, and insert the pivot bolt 9 into one of the bearings 6, the engine mounting bracket 8, and the other bearing 6. It is fixed by tightening a lock nut 10.

In that case, since the thrust bush 11 and the bearing (generally a needle bearing) 12 are inserted between the pivot bolt 9 and the bearing part 6, it is necessary to install dust seals 13 and 14 for the bearing 12 on both end faces of the bearing part 6. There is.

Since the dust seal is attached by fitting, a recess 15 is formed along the inner periphery of both left and right end surfaces of the bearing part 6 as shown in FIG.
・16 is formed by machining, and the recesses 15 and 16 are formed by machining.
It is conceivable to fit dust seals 13 and 14 in each.

However, in order to accurately align the centers of the left and right shaft holes of the left and right bearings 6 and 6 and the dust seal mounting recesses 15 and 16, the left and right rear fork members 22 and 22 are integrally connected by a cross member 21. It must be done from the outside.

Therefore, the dust seal mounting recess 1 on the inner end surface of each bearing part 6
6 (shown in the fourth figure) using, for example, a cutting tool that enters from the outside of the bearing portion 6, the movement of the cutting tool becomes complicated, so a dedicated processing machine is required, and the processing time becomes longer.

In view of the above points, this proposal simplifies the machining of the bearing part and facilitates the installation of the dust seal.
As shown in FIG. 2, a circular recess 15 that is concentric with the shaft hole and has a larger diameter than the shaft hole is formed on the outer end surface of each of the left and right bearing sections 6, and a circular recess 15 that is larger in diameter than the shaft hole is formed on the inner end surface of each bearing section 6. Circular recess 15
Dust seal housing 1 having a concave portion having approximately the same shape as
The dust seals 13 and 14 were fitted into the circular recess 15 on the outer end surface and the circular recess of the dust seal housing 17 on the inner end surface, respectively. The gist is that.

As shown in FIG. 3, the dust seal housing 17 is press-molded into a shallow pot shape with four circular parts on one side, and a small diameter short cylindrical part 1 in the center on the other side.
71 may be formed to have a convex shape in the longitudinal section at the center thereof, and the small-diameter short cylindrical portion 171 may be configured to be press-fitted into the shaft hole at the inner end surface of the bearing portion 6.

In the bearing device of the rear fork of this invention, the dust seals attached to both end faces of the left and right bearing parts are installed in the above configuration, so the machining of the shaft hole and seal mounting recess for each of the left and right bearing parts is only done from the outside. It is easy to make.

The dust seal 14 on the inner end surface is fitted into a housing 17 that is separately molded and attached to the end surface, but it is easy to fit the dust seal 13 into the recess 15 on the outer end surface in the same manner.

[Brief explanation of drawings]

Figure 1 is a side view of the rear part of the motorcycle, Figure 2 is a partially cutaway plan view of the rear fork bearing device of the present invention, Figure 3 is an oblique view of the dust seal housing, and Figure 4 is a partially cutaway view of the conventional bearing. Plan view. 1 is the body frame, 2 is the rear fork, 6 is the bearing part, 9
10 is a pivot bolt, 10 is a lock nut, 11 is a thrust bush, 12 is a needle bearing, 13 and 14 are dust seals, 15 is a dust seal fitting recess, and 17 is a dust seal housing.

Claims (1)

[Scope of utility model registration request] In a rear fork with separate left and right bearing parts that are attached to the vehicle body frame, a circular recess is formed on the outer end surface of each bearing part, concentric with the shaft hole and having a larger diameter than the shaft hole. , attaching a dust seal housing having a recess having substantially the same shape as the circular recess on the outer end surface by fitting a short cylindrical portion formed on the back surface of the circular recess into the shaft hole;
A bearing device for a rear fork in a motorcycle, wherein a dust seal is fitted into a circular recess on the outer end face and a circular recess of the dust seal housing on the inner end face.