JPH0439099Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a brake disc attachment/detachment structure for a two-wheeled motor vehicle.

[Prior Art] In motorcycles, a rear swing arm that supports a rear wheel in a cantilevered manner is known. A rear wheel is attached to one end of the rear axle held by the axle holding portion of the rear swing arm, and a driven sprocket is attached to the other end.

Further, around the rear axle, a brake caliper is fixed to the rear swing arm side, and a brake disc is fixed to the rear axle side. The brake disc is bolted to the rear axle flange, and the flange and rear wheel hub are also bolted together.

[Problems that the invention aims to solve] By the way, in the conventional example, when you want to replace the brake disc, first remove the rear wheel from the rear axle, then pull out the rear axle from the rear swing arm, and then replace the brake disc with the flange. I had to remove the bolted brake disc. For this reason, it took time and effort to remove and replace the brake disc.

The purpose of the present invention has been made in view of the above-mentioned points, and is to provide a brake disc attachment/detachment structure for a motorcycle that improves maintainability by allowing quick and easy brake disc replacement work. .

[Means for Solving the Problems] The brake disc attachment/detachment structure for a motorcycle according to the present invention includes a flange portion at one end of the rear axle which is rotatably supported by the rear end of the cantilevered rear swing arm. and a two-wheeled motor vehicle in which a brake disc and a rear wheel hub part are attached to the flange part; The present invention is characterized in that when the brake disc is rotated by a predetermined amount, half of the attachment parts on the brake disc side are detached from the flange part.

[Operation of the invention] According to the invention, when the brake disc is rotated relative to the flange portion, half of its mounting portions no longer overlap with the flange portion. Therefore, when the brake disc is tilted, this portion comes off from the flange portion, so that the brake disc can be removed from the flange portion.

[Example] Hereinafter, details of the present invention will be explained using examples shown in FIGS. 1 to 4.

FIG. 1 is a diagram showing the appearance of a two-wheeled motor vehicle that employs the brake disc attachment/detachment structure according to the present invention.
Cantilevered rear swing arm 2 on body frame 1
is rotatably attached to its tip by a pivot bolt. As shown in FIG. 2, an axle holding portion 4 having a short-axis cylindrical shape for supporting the rear wheel 3 is provided at the rear end portion of the rear swing arm 2.

An eccentric holder 5 is fitted into the axle holding portion 4 so as to be rotatable as required. The eccentric holder 5 has a rear axle insertion hole 6 that is eccentric with respect to the axis of the axle holding portion 4, and a rear axle 9 is rotatably inserted into the rear axle insertion hole 6 via bearings 7 and 8. A driven sprocket 11 is fixed to one end of the rear axle 9 via an axle nut 10, and a rear wheel 4 is fixed to the other end via a center nut 12. That is, the second end is located at the other end of the rear axle 9.
As shown in the figure, a rear wheel hub portion 13 is fitted, and a flange portion 9a of the rear axle 9 is fixed thereto via bolts 14. Furthermore, the center nut 12 has a fixing pin 15 attached to one end of the rear axle 9.
It is prevented from falling out.

An endless chain 16 is engaged with the driven sprocket 11, and the driven sprocket 11 is connected via the chain 16 to a drive sprocket fixed to the output shaft of a transmission (not shown). There is.

In addition, the flange portion 9a of the rear axle 9 has
A ring-shaped brake disk 18 is fixed via bolts 17, and a brake caliper 20 is supported and fixed on the rear swing arm 2 side via a caliper bracket 19.

As shown in detail in FIG.
In addition to providing chevron-shaped mounting portions 9b at certain locations, four chevron-shaped mounting portions 18a are provided at regular intervals on the inner peripheral side of the brake disc 18 in line with the mounting portions 9b. When fixing the brake disc 18 to the flange portion 9a of the rear axle 9, after aligning each mounting portion 9b, 18a, insert the mounting holes 9c, 1 of each mounting portion 9b, 18b.
This is done by passing bolts 17 through 8b and fastening them.

Therefore, in the above-described configuration, when the brake disc 18 is to be removed, the fixing pin 15 is first removed and the rear wheel 4 is removed from the rear axle 9. Therefore, when the bolts 17 fixing the brake disc 18 to the flange part 9a are removed and the flange part 9a of the rear axle 9 is rotated by a predetermined amount (for example, by an angle θ) as shown in FIG. Half of the mounting portions 18a no longer overlap the mounting portions 9b of the flange portion 9a. In this state, as shown in FIG. 4, when the brake disc 18 is tilted at a predetermined angle, the brake disc 1
8 first passes through the flange 9a (as shown by the imaginary line A in FIG. 6). Next, push the brake disc 18 that came out toward the rear axle 9 (same B)
Then, the opposite side also comes off from the flange 9a (same C).
Therefore, move the rear axle 9 to the rear swing arm 2.
Only the brake disc 18 can be removed without pulling it out from the holding part, and a replacement part can be installed in the reverse order.

[Effect of the invention] According to the brake disc attachment/detachment structure for a motorcycle according to the invention, after releasing the fixation between the brake disc and the flange portion of the rear axle, the brake disc is rotated by a predetermined amount and tilted at a predetermined angle. By doing so, the brake disc can be removed, so when replacing the brake disc, it is now possible to replace the rear axle with the rear axle still attached to the rear swing arm. Therefore, the brake disc replacement work can be performed much more quickly and easily than in the past.

[Brief explanation of drawings]

Figures 1 to 4 show examples, where Figure 1 is an external side view of the motorcycle, Figure 2 is a sectional view of the main parts, Figure 3 is a side view of the main parts, and Figure 4 is the main parts. FIG. Explanation of symbols, 2... Rear swing arm, 9...
...Rear axle, 9a...Flange part, 13...
Rear wheel hub part, 18...brake disc, 18a
...Mounting part.

Claims (1)

[Scope of utility model registration request] In a two-wheeled motor vehicle, a flange is provided at one end of a rear axle rotatably supported by the rear end of a cantilevered rear swing arm, and a brake disc and a rear wheel hub are attached to this flange. ,
A mounting portion that protrudes radially inward on the inner circumferential side of the brake disc and can be overlapped with the flange portion is provided, and when the brake disc is rotated by a predetermined amount, half of the mounting portions on the brake disc side A brake disc attachment/detachment structure for a two-wheeled motor vehicle, characterized in that it is configured to be detachable from a flange portion.