JPS6021346Y2 - Motorcycle axle mounting device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an axle mounting device for a motorcycle.

Conventionally, when attaching a rear axle to a hollow cylindrical rear fork, an end plate is welded to the rear end of the rear fork, the axle is passed through the end plate, and the axle is tightened and fixed in the axial direction with nuts, etc. Welding the end plates is laborious and inevitably increases costs.

Therefore, it is desirable to pass the axle directly through the rear fork and tighten it with a nut, but in this case, the large tightening force from the nut will act on the hollow cylindrical rear fork as a compressive force from both the left and right sides. In order for the rear fork to be able to resist the tightening force, it is conceivable to fit a collar into which the axle can be inserted, and have both end surfaces abut against the opposite inner wall of the rear fork. Due to manufacturing variations in the inner diameter, a gap may occur between the collar catcher and the inner wall of the fork, and this gap may partially absorb the tightening force of the nut, resulting in insufficient tightening.

In view of the above, the present invention includes a collar that receives the above-mentioned tightening force inside the fork, and also provides a means for absorbing manufacturing variations in the inner diameter of the fork. It is an object of the present invention to provide the axle mounting device, which can be reliably mounted on a fork.

Hereinafter, embodiments of the present invention will be explained with reference to the drawings.
1 to 4 show a first embodiment, in which 1 is a body frame of a motorcycle, and the front ends of a pair of rear forks 3 as forks are pivotally connected to a rear bracket 2 of the body frame through a mounting shaft 4. There is.

Each rear fork 3 is formed into a hollow cylindrical shape with a rectangular cross section, and a long hole 7 through which the axle 6 of the rear wheel 5 is inserted is formed in the opposing side walls of the axle penetration portion 3a, and in the upper and lower walls. In addition, slits 8 are formed to be long in the longitudinal direction of the vehicle body as means for allowing deformation of the axle penetrating portion 6a in the axial direction of the axle 6.

Inside the axle penetrating portion 3a of each rear fork 3, a rectangular collar 10 made of aluminum alloy or antirust-treated steel is disposed in which the shaft insertion hole 9 matches the circumferential elongated hole 7.

A bolt-shaped axle 6 of the rear wheel 5 is inserted into the circumferential hole 7 and the collar 10 of each rear fork 3, and a bub 1 of the rear wheel 5 is provided at a portion of the axle 6 located between both rear forks 3.
1. A pair of collars arranged on both sides of the collar 12.
13 are respectively fitted, and the rear fork 3 of the axle 6
A seat nut 15 is screwed onto the threaded portion 14 that projects outward.

In this case, even if there is a gap between the inner wall of each rear fork 3 and both end surfaces of each collar 10 due to manufacturing variations in the rear forks 3, when the nut 15 is tightened, the slit 8 will be activated. The axle penetration portion 3a of each rear fork 3 can deform in the axial direction of the axle 6 to close the gap,
Therefore, since the inner wall of each rear fork 3 and the collar 10 are in close contact with each other, each rear fork 3 functions like a solid body, and a large tightening force is obtained by the nut 15, so that the axle 6 can be securely attached to the rear fork 3. I can do it.

A drive chain 19 is suspended between a drive sprocket 17 of the engine 16 and a driven sprocket 18 attached to the hub 11, and adjustment bolts 20 for adjusting the tension of the chain 19 are attached to the left and right of the vehicle body of the collar 10. The head is positioned in a notched groove 21 extending in the direction, and passes through a support plate 22 that engages with the bottom of the groove and the rear end surface of the rear fork 3, and an adjustment nut 23 and a lock nut 24 are screwed into the protruding end thereof. .

The width of the notch groove 21 is matched to the width of two parallel surfaces of the head of the adjusting bolt 20, and this prevents the adjusting bolt 20 from turning. Therefore, when the lock nut 24 is loosened and the adjusting nut 23 is turned, the collar 10 is rotated. The axle 6 moves back and forth within the elongated hole 7, thereby allowing the tension of the drive chain 19 to be adjusted as appropriate.

The tension adjustment amount of the chain 19 is determined by color 1 on the scale 25 carved on the outer surface of the upper wall of the rear fork 3 along the slit 8.
By aligning the trailing edges of the drive chain 19, it can be easily recognized, and the tension adjustment of the drive chain 19 can be easily performed.

The mechanism for adjusting the tension of the drive chain 19 has the same structure for the left and right rear forks 3.

Omitting the cutout groove 21 of the guide roller 10, adjust the adjustment bolt 2.
0 may be changed to a stud bolt.

5 and 6 show a second embodiment. In this example, a collar 10 □ with an annular cross section is used, and a steel band 27 is wound around the annular groove 26 on the outer circumferential surface of the collar 10 □. The formed pair of locking claws 28 are engaged with the neck of the adjustment bolt 20 to weld the band 27 and the adjustment bolt 20, and the collar 101 and the adjustment bolt 20 are integrated via the band 27. .

7 to 9 show a third embodiment, in which the axle penetrating portion 3a of each rear fork 3 is formed so that its width in the left-right direction of the vehicle body becomes thin, and the intermediate portions of the upper and lower walls are A bead 29 is formed so as to protrude downward and extend in the longitudinal direction of the vehicle body.

Each bead 29 functions as a means for allowing deformation of the axle penetrating portion 3a in the axial direction of the axle 6, and
When tightening and fixing, each bead 29 deforms in the axial direction of the axle 6 and can close the gap created between the end face of the collar 10 and the inner wall of the rear fork 3.

The collar 10□ has approximately the same shape as the first embodiment except that it is formed flat, and the structure of the adjustment bolt 20 is also approximately the same, so the same parts are designated by the same reference numerals. be.

In this embodiment, a scale 25 for visually checking the tension state of the drive chain 19 is carved on the edge of the elongated hole 7 on the outer surface of the rear fork 3.

As described above, according to the present invention, in the hollow cylindrical fork 3,
In the axle mounting device for a motorcycle, in which the axle 6 passing through the fork 3 is tightened and fixed in the axial direction, inside the fork 3,
The collars 10.10□, 102 are disposed coaxially with the axle 6, and the axle penetrating portion 3a of the fork 3 is provided with a means for allowing compressive deformation in the axial direction of the axle 6. Fork 3 and collar 10.10□, 10
Even if there is a gap in the axle axis direction between nut 15 and
When the axle 6 is tightened and fixed by the above tightening force, the axle penetrating portion 3a is deformed and the gap is closed, whereby each fork 3 functions like a solid body, and therefore a large tightening force is obtained. The axle 6 can be reliably attached to the fork 3.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention.
The figure is a partial side view of a motorcycle, Figure 2 is an enlarged cross-sectional view taken along the line ■-■ in Figure 1, Figure 3 is a cross-sectional view taken along the line ■-■ in Figure 2, and Figure 4 is a cross-sectional view taken along the line IV-IV in Figure 3. 5 and 6 show a second embodiment of the present invention, FIG. 5 is a vertical sectional side view of the rear part of the rear fork, FIG. 6 is a sectional view taken along the line Vl-VI in FIG. 5, and FIGS. Figure 9 shows the third embodiment of the present invention, Figure 7 is a side view of the rear part of the rear fork, Figure 8 is a cross-sectional view along the line ■-■ in Figure 7, and Figure 9 is a cross-sectional view along the line ■-■ in Figure 7. It is a diagram. 3... Rear fork as a fork, 3a.
... Axle penetration part, 6 ... Axle, 10.
10. , 102...color, 8,29...
...Slit as a means of allowing deformation of the axle penetration part,
bead.

Claims (1)

[Scope of utility model registration request] In a motorcycle axle mounting device in which an axle 6 passing through the hollow cylindrical fork 3 is firmly fixed in the axial direction, a collar 10, io, 10° is installed coaxially with the axle 6 inside the fork 3. An axle mounting device for a motorcycle, the axle mounting device for a motorcycle comprising: a means for allowing compressive deformation in an axial direction of an axle shaft 6 in an axle penetrating portion 3a of the fork 3;