JPH0810533Y2 - Wheel support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a wheel support structure.

[Prior Art] As a wheel support structure for a cantilever type swing arm of a motorcycle, for example, one disclosed in JP-A-63-263185 is known.

This structure will be described with reference to FIG.
Reference numeral 1 in the drawing denotes a swing arm whose front end (the right side in FIG. 1 is the front end) is swingably supported by the vehicle body frame. The swing arm 1 has a support shaft 3 through a known eccentric unit 2 for adjusting the tension of the chain.
Are rotatably supported. The support shaft 3 includes a large diameter shaft 4 arranged concentrically with each other and a small diameter shaft 5 inserted into the large diameter shaft 4 at one end side. Both are the head 5a of the thin shaft 5.
Is engaged with the inner flange 6 of the large-diameter shaft 4 and is prevented from coming off, thereby positioning in the longitudinal direction, and the vicinity of the head of the small-diameter shaft 5 is spline-fitted to the inner flange 6 to be integrated. To rotate.

A rear wheel 7 is attached to the outer periphery of the support shaft 3 so as to rotate integrally. That is, one end of the large diameter shaft 4 has the rear wheel 7
While being fitted into the central hole 11 of the hub portion 10, a flange 12 is integrally formed on the outer circumference of the large diameter shaft 4, and a plurality of concentric rotation preventing pins 13 penetrate the flange 12. Then, it is fitted into the end face portion of the hub portion 10. Further, an axle nut 17 is fitted to a projecting portion of the small-diameter shaft 5 protruding from the large-diameter shaft 4 via a spacer 16 externally fitted to the large-diameter shaft 4,
The axle nut 17 is screwed into the screw portion 5a formed at the tip of the small-diameter shaft 5 to be tightened, so that the tip of the ring-shaped taper portion 16a formed inside the spacer 16 becomes the taper portion of the hub portion 10. It fits on the outer circumference of the large-diameter shaft 4 while reducing its diameter along 10a. It should be noted that slits (not shown) are formed in the tapered portion 16a of the spacer 16 at appropriate intervals in the circumferential direction, so that the diameter can be reduced.

Further, a threaded portion 4a is formed at an end of the support shaft 3 on the side opposite to the rear wheel 7 of the large-diameter shaft 4, and a serration 4b is formed inside thereof, and the serration 4b has a driven sprocket.
A support member 21 that supports 20 is fitted, and a nut 22 is screwed to the screw portion 4a via a washer.

Reference numeral 23 is a caliper bracket that supports the caliper 24, and 25 is a brake disc.

[Problems to be solved by the device]

By the way, when removing the rear wheel 7 in the wheel support structure, the axle nut 17 is removed and the spacer 16 is removed from the small-diameter shaft 5 to replace the rear wheel 7 or perform maintenance on the rear wheel 7.

However, at this time, the axle nut
When the spacer 17 was tightened, the tapered portion 16a of the spacer 16 was strongly fitted to the tapered portion 10a of the hub portion 10 of the rear wheel 7 and the spacer 16 could not be pulled out from the support shaft 3.

The present invention has been made in view of the above circumstances, and provides a wheel support structure with which the spacer can be easily removed even when the spacer is firmly fitted to the hub portion of the wheel, and maintenance workability is excellent. The purpose is to do.

[Means for solving the problem]

In the present invention, in order to achieve the above object, a protrusion protruding laterally is provided on the outer periphery of the nut, and the spacer is loosely fitted to the protrusion to prevent the nut from moving relative to the spacer. Locking spacers are provided on the spacer.

[Action]

When the nut is rotated and pulled out from the threaded portion of the support shaft, as the nut moves in the pulling-out direction, the locking claw fits on the protrusion of the nut and the spacer also moves integrally in the same direction.

Therefore, even if the tapered portion of the spacer is fitted to the hub portion of the wheel, the spacer can be pulled out by utilizing the force of the screw.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the present embodiment, the same components as those of the conventional wheel support structure will be designated by the same reference numerals and the description thereof will be omitted.

First Embodiment FIG. 2 shows a first embodiment of the present invention. In the wheel supporting structure of the present invention, the spacer is provided on the outer periphery of the nut 30.
A ring-shaped protrusion 31 protruding laterally is integrally formed at the end on the 35 side. The height of the protrusions 31 is set such that a spanner can be engaged with the outer peripheral engagement surface of the nut 30 to tighten or loosen the nut.

On the other hand, on the spacer 35, ring-shaped locking claws 36 that are loosely fitted to the protrusions 31 of the nut 30 are attached to the opposing surface on the nut 30 side by bolts 37 provided at appropriate intervals in the circumferential direction.

The ring-shaped locking claw 36 includes a donut-shaped flat plate portion 36a which is brought into contact with the end surface of the spacer 35 and bolted thereto, and the flat plate portion 3a.
It comprises an upright portion 36b that rises at the inner end of 6a, and a donut-shaped engaging portion 36c that extends inward from the upper end of the upright portion 36a and has a smaller diameter than the flat plate portion 36a. The inner diameter l ₁ of the flat portion 36a and upright portion 36b is set larger than the outer shape l ₂ of the projection 31, the inner diameter l ₃ of the engaging portion 36c is outline l of projections 31
It is set smaller than ₂ , and the height h ₁ of the engaging part 36c is
It is set higher than the thickness h _{2 of} 31. As a result, when the nut 30 moves relatively to the spacer 35 in the direction of separating from the spacer 35, the engagement bottom surface 36cc of the engagement portion 36c is engaged with the engagement top surface 3 of the protrusion 31.
1a is abutted to regulate the same movement, and nut 30 is a spacer
It is designed to allow it when it rotates relative to 35.

According to the wheel support structure having the above-described configuration, the nut 30 is assembled to the spacer 35 in a state where the nut 30 is restricted from moving relative to the spacer 35 in a direction away from the spacer 35, while relative rotation with respect to the spacer 35 is allowed. So the spacer
When the nut 30 is screwed into the threaded portion 5a of the small-diameter shaft 5 from the outside of the screw 35 and tightened, the spacer 35 can be strongly pressed to the hub portion 10 side without rotating, as in the conventional example. When removing the nut 30, the spacer 35 can be pulled out as the nut 30 moves in the pulling-out direction. Therefore, even when the spacer 35 is strongly fitted to the hub portion 10 of the wheel 7, the fitting force of the spacer 35 can be removed by using the screw force of the nut 30, and the spacer 35 can be easily removed. become.

Second Embodiment FIG. 3 shows a second embodiment of the present invention. The feature of this embodiment is that the locking claw 36 that engages with the protrusion 31 of the nut 30 is provided with a spacer.
It is a point that is integrally formed on the 35.

As a means for integrally forming the locking claw 36 on the spacer 35 in this way, there is rolling caulking, for example. Also in this embodiment, the engaging claw 36 is formed with the projection 31 with a play that allows relative rotation of the nut 30.

Other configurations and advantages of this embodiment are the same as those of the first embodiment, so description thereof will be omitted.

In addition, in each of the above-described embodiments, an example in which the present invention is applied to the support shaft 3 configured by two members of the large-diameter shaft 4 and the small-diameter shaft 5 is described, but the present invention is not limited to this. The invention can of course be applied to a device in which the wheel support shaft is constituted by one shaft.

Further, in each of the above-mentioned embodiments, both the protrusion 31 and the engaging claw 36 loosely fitted thereto are formed in a ring shape, but the present invention is not limited to this, and either one may be provided at intervals in the circumferential direction. It may be configured.

[Effect of device]

As described above, according to the present invention, the nut is provided with the protrusion protruding laterally and the locking claw that is loosely fitted to the protrusion is provided on the spacer. Therefore, the nut is rotated to rotate the axle support shaft. When pulling out from the spacer, the spacer can also be moved in the same direction as the nut moves in the pulling direction, and even if the spacer's taper part is fitted to the hub part of the wheel, use the nut's screw. The spacer can be pulled out, and maintenance work is excellent.

Further, since the nut and the spacer are always assembled, it becomes easy to manage the parts and prevent them from being lost.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a conventional example of a wheel support structure. FIG. 2 is an enlarged cross-sectional view of the main part showing the first embodiment of the present invention,
FIG. 3 is an enlarged cross-sectional view of the essential parts showing the second embodiment of the present invention. 1 ... Swing arm (wheel support member), 3 ... Support shaft, 5a ... Screw part, 7 ... Rear wheel (wheel), 10 ... Hub part, 30 ... Nut, 31 ... Protrusion, 16a ... … Taper part, 3
5 …… Spacer, 36 …… Locking claw.

Claims (1)

[Scope of utility model registration request] 1. A threaded portion is provided at one end of a support shaft attached to a wheel supporting member, the threaded portion is penetrated through a hub portion of a wheel and a spacer adjacent to the hub portion, and is projected outward. In the support structure of the wheel for fixing the spacer by pressing the spacer against the hub portion of the wheel by screwing a nut and tightening the nut, a protrusion protruding laterally is provided on the outer periphery of the nut, and the spacer is A support structure for a wheel, characterized in that a locking claw is provided to prevent the nut from moving relative to the spacer by loosely fitting the projection.