JPS5814155Y2 - Two-wheeled vehicle rear fork pivot device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pivot device that is swingably attached to a vehicle body frame at the front end of a rear fork in a motorcycle.

Conventionally, the pivot device of a motorcycle fork is
As shown in Fig. 3, one end of the support shaft C is screwed into a bracket a having a screw hole a and welded to the vehicle body frame b, and is fixed with a bolt d. A swing shaft f was supported by a bearing g at the other end via a collar e.

In addition, as shown in Fig. 4, a bracket i is bath-bonded to the vehicle body frame h, a collar j is welded to the bracket i,
Fit the bushing k whose inner hole is threaded into the collar j, screw the threaded part 11 at the base of the support shaft l into the bushing k, and attach the swing shaft n of the rear fork m to the support shaft l.
A pivot device is also used which is configured to be supported via a (for example, Japanese Utility Model Publication No. 51-52120).

However, in the device shown in Fig. 3, the bracket a with the screw hole a□ is welded to the vehicle body frame b, and the alignment accuracy of the left and right axes is poor. Deformation etc. are likely to occur during assembly, and the screw hole a□
If the thread of the screw hole a□ is damaged due to the insertion of a foreign object into the screw hole a1, the screw hole a1 cannot be corrected, so the vehicle body frame b itself must be replaced, resulting in high repair costs.

In the device shown in Fig. 4, the threaded part l□ is
Since they are screwed together in the inner housing of the rear fork m, if repeated loads from the rear fork m act on the threaded part 11 over a long period of time, the threads of the threaded part 11 will easily become damaged, and since there are many mating parts, the machining will be difficult. On top of that, it had drawbacks such as requiring high precision.

The present invention has been developed in view of this point, and allows for attachment and detachment of an adjustment plate having a tapped hole on the outer end surface of the support bracket without directly providing a screw hole in the support bracket that is welded and fixed to the vehicle body frame. By adjusting and screwing the support shaft (small diameter threaded part) that is attached and fixed to the support shaft and rotatably supports the swing shaft of the fork into the adjustment plate, the adjustment plate with the threaded hole can be replaced independently. In addition, it is an object of the present invention to provide a pivot device for a rear fork of a two-wheeled vehicle, which facilitates dimensional adjustment.

EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention will be explained based on an Example along with drawing.

In FIGS. 1 and 2, reference numeral 1 denotes a vehicle body frame, and support brackets 2, 2 are fixed to the left and right sides of the body frame.

The support bracket 2 consists of a mounting part 2a that is welded and fixed to the vehicle body frame 1, and a cylindrical bracket main body 2c in which a support hole 2b is bored. It is removably attached and fixed to the outer end surface of the main body 2c with a lock bolt 5 via a spring washer 4.

The screw hole 3a of the adjustment plate 3 is connected to the support hole 2b of the support bracket 2.
It is coaxial with.

Reference numeral 6 denotes a support shaft, which has a small diameter portion 6as, a large diameter portion 6b, and a small diameter threaded portion 6C connected in this order, and is provided on the left and right sides of the vehicle body frame 1.

The large diameter portion 6b of the support shaft 6 is connected to the support hole 2 of the bracket body 2c.
bVci is inserted, and the small diameter screw portion 6c protruding from the outer end surface of the bracket body 2c is screwed into the screw hole 3a of the adjustment plate 3, and an adjustment nut 7 is inserted so that the support position of the support shaft 6 can be adjusted. The small diameter portion 6a protruding from the inner end surface of the bracket body 2c is fixed to the swing shaft 8.
The swing shaft 8 of the rear fork 10 is rotatably supported by bearings 9.9 fitted to both ends of the rear fork.

In addition, 6d is a wrench hole provided at the tip of the small diameter screw portion 6c, 11 is a transmission output shaft, 12 is a wheel, 13 is a drive shaft, 14 is a universal joint between the transmission output shaft 11 and the drive shaft 13, 15 is a decorative cover that covers the adjustment nut 7.

Since the present invention is constructed as described above, the adjustment plate is removably attached and fixed to the outer end surface of the support bracket welded and fixed to the vehicle body frame, and the support shaft rotatably supports the swing shaft of the rear fork. Since it has a double support structure in which the screw is adjustable and screwed into the screw hole of the adjustment plate, the screw dimensions can be selected according to performance (strength) without requiring high machining accuracy. can.

The threaded part between the housing, support shaft, and adjustment plate is not a part of the support bracket that mainly receives external loads, but is a part that protrudes from the outer end surface of the support bracket, so there is no possibility of deformation of the threads or screw holes during assembly. In addition, even if it occurs, only the adjusting plate needs to be replaced, so replacement is easy and repair costs are low. Dimension correction after welding and fine polling by machining are also possible. It has various practical effects.

[Brief explanation of the drawing]

FIG. 1 is a sectional plan view showing an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same, and FIGS. 3 and 4 are sectional plan views of a conventional example. 1... Vehicle body frame, 2... Support bracket, 3... Adjustment plate, 3a... Screw hole, 6... Support shaft, 6c...Small diameter screw part, 8...Swivel shaft, 10...Rear fork

Claims (1)

[Scope of utility model registration request] The proximal end of a support bracket having a support hole at its tip is fixed to the vehicle body frame, adjustment plates are removably attached and fixed to both outer ends of the support bracket, and the adjustment plates have support holes for the support bracket. A bend, JL, is formed coaxially with the hole, and the large diameter portion of the support shaft is formed by sequentially coaxially connecting a housing, a small diameter portion, a large diameter portion, and a small diameter threaded portion into the support hole of the support bracket. The small diameter threaded portion protrudes from the outer end surface of the support bracket and is threaded into the threaded hole of the adjustment plate in an adjustable manner, and the small diameter portion protrudes from the inner end surface of the support bracket and is screwed into the screw hole of the adjustment plate. A pivot device for a two-wheeled vehicle fork, characterized by rotatably supporting a swing shaft.