JPH082472A - Mounting structure for rear brake caliper - Google Patents

Abstract

PURPOSE:To prevent deformation in a caliper bracket even when strong fastening force is applied and to eliminate an iron plate arranged between the caliper bracket and a rear swing arm. CONSTITUTION:A part 20A, which is brought into contact with a rear swing arm 4, in a caliper bracket 8A is formed extensionally in the longitudinal direction of the rear swing arm 4 and is formed into a rectangle, while in the contact part 20A, a groove 24 is formed in a side opposed to a through hole 4a, through which an axle shaft 10 is passed, in the rear swing arm 4 so that a cross section of the contact part 20A in the caliper bracket 8A is formed into a recessed shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear brake caliper mounting structure.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a conventional rear brake caliper mounting structure 1. A rear brake caliper (hereinafter, simply referred to as “caliper”) 2 is attached between the rear end portion 4r of the rear swing arm 4 and the rear wheel 6 via a caliper bracket 8 so as to be sandwiched therebetween. And for this installation,
A rear axle shaft 10 as a rear wheel shaft having a threaded end is also used as a mounting bolt. The rear axle shaft 10 includes the rear swing arm 4,
After being passed through the rear wheel 6 and the caliper bracket 8, and the through holes 4a, 6a, 8a, 12a and 14a of the collar 12, the chain pulling block 14 and the like, they are screwed with a fixing nut (not shown). This screw is
To prevent the displacement of the rear axle shaft 10, the rear axle shaft 10 is firmly tightened with a predetermined torque.

By the way, in a motocross type motorcycle in which the caliper bracket 8 and the rear swing arm 4 are made of a light alloy such as aluminum, the caliper bracket 8 having a small contact portion is brought into contact due to the above-mentioned tight fastening. There is a possibility of diving into the rear swing arm 4 having a large portion. Therefore, in order to prevent this, an iron plate 16 is interposed between the caliper bracket 8 and the rear swing arm 4. The iron plate 16
It is fixed to the rear swing arm 4 by a plurality of screws 18 and 18 (two are shown in FIG. 3).
Further, it is formed larger than the caliper bracket 8. The iron plate 16 has a through hole 16a having the same shape and size as the through hole 4a of the rear swing arm 4.
Are formed.

However, even in this case, if the tightening force of the screw is strong, the portion 20 ₂ of the caliper bracket 8 that contacts the rear swing arm 4 except the portion 20 ₂ facing the through hole 4a of the rear swing arm 4 ( There is a risk that the shaded portions 20 ₁ and 20 _{1 in} FIG. 3 may be recessed as compared with the portion 20 _{2 of the} contact portion 20 that faces the through hole 4a of the rear swing arm 4. In other words, the portion 20 ₂ projects more than the portions 20 ₁ and 20 ₁ according to the shape of the through hole 4 a, so that the contact portion 20 of the caliper bracket 8 with the rear swing arm 4 has a convex cross section. It becomes a shape. In this way the caliper bracket 8
When the cross section has a convex shape, the portion 20 ₂
May hit the through hole 4a of the rear swing arm 4 during the chain adjuster, and in that case, there is a problem that a desired chain adjuster cannot be formed.

Further, since the iron plate causes the weight of the vehicle body of the motorcycle to be increased, it has been desired to provide a technique capable of removing the iron plate as well as solving the problem of the chain adjuster.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and the problem to be solved is to mount a rear brake caliper between a rear swing arm and a rear wheel hub. Even if the rear axle shaft has a strong tightening force at this time, this tightening force can prevent the portion of the caliper bracket that faces the through hole of the rear swing arm from projecting more than the portion other than the through hole. Accordingly, it is an object of the present invention to provide a new rear brake caliper mounting structure which can prevent the chain adjuster from being hindered and can remove the iron plate which has been conventionally required.

[0007]

The present invention is to solve the above problems and is as follows.
That is, the present invention relates to a rear brake caliper mounting structure in which a rear swing arm and a rear wheel are bolted with an axle shaft via a caliper bracket. The pressure per unit area at the contact portion of the caliper bracket with the rear swing arm when tightening the bolt is smaller than the pressure per unit area at the contact portion of the rear swing arm with the caliper bracket. A portion of the caliper bracket that comes into contact with the rear swing arm is extended in the longitudinal direction of the swing arm, and the axle of the contact portion of the caliper bracket has a concave cross-section. It is characterized in that a portion facing the through hole of the rear swing arm through which the shaft is passed is formed as a recess.

[0008]

According to the present invention, the pressure per unit area at the contact portion of the caliper bracket with the rear swing arm at the time of bolting is smaller than the pressure per unit area at the contact portion of the rear swing arm with the caliper bracket. Since the portion of the caliper bracket that comes into contact with the rear swing arm is formed so as to be extended in the longitudinal direction of the swing arm,
The caliper bracket will no longer dive into the rear swingarm.

Further, in the contact portion of the caliper bracket, the cross-section of the contact portion has a concave shape.
Since the surface portion facing the through hole of the rear swing arm through which the axle shaft is passed is a concave portion, the pressure per unit area at the contact portion of the caliper bracket with the rear swing arm at the time of bolting is the rear swing arm. Even if it is assumed that the axle shaft is tightened with a tightening force larger than the pressure per unit area in the contact portion with the caliper bracket, the non-recessed portion is crushed or the rear swing arm is Even if you start to bite,
Since there is a step between the non-recessed portion and the surface portion facing the through hole of the rear swing arm, the surface portion facing the through hole of the rear swing arm which is the recessed portion protrudes and hits the through hole of the rear swing arm. It doesn't end up.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A mounting structure for a rear brake caliper of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a side view of a rear swing arm in which a rear brake caliper mounting structure according to the present invention is adopted,
FIG. 2 is an enlarged perspective exploded view of a main part of FIG. The rear brake caliper mounting structure 1A according to the present invention is different from the rear brake caliper mounting structure 1 described in the section of the prior art only in the shape of the caliper bracket, and the same parts are the same in other parts. The reference numerals are given and the description is omitted.

In the caliper 2A, the pressure per unit area at the contact portion 20A of the caliper bracket 8A with the rear swing arm 4 when bolting with the rear axle shaft 10 is at the contact portion 20B of the rear swing arm 4 with the caliper bracket 8A. The contact portion 20 of the caliper bracket 8A with the rear swing arm 4 so that the pressure becomes smaller than the pressure per unit area.
A is extended in the longitudinal direction of the rear swing arm 4 to form a rectangular shape, and the rear axle shaft 10 of the contact portion 20A is passed through so that the contact portion 20A of the caliper bracket 8A has a concave cross section. A portion of the rear swing arm 4 facing the track-shaped through hole 4a is formed as a groove 24 as a recess, and a contact portion 20A with the rear swing arm 4 is formed in a lateral channel shape. Further, the upper and lower grooves 24 by forming the groove 24, the rear swing does not face the through hole 4a of the arm 4 parts (long rectangular-shaped portion indicated by oblique lines in FIG. 2) 20A ₁ · 20
A ₁ is formed. The reference numeral 26 indicates a brake disc.

In the rear brake caliper mounting structure 1A thus constructed, however, the pressure per unit area at the contact portion 20A of the caliper bracket 8A with the rear swing arm 4 when the bolt is tightened is the rear pressure. Swing arm 4 caliper bracket 8
The contact portion 20A of the caliper bracket 8A with the rear swing arm 4 is moved so as to be smaller than the pressure per unit area in the contact portion with A.
The caliper bracket 8A is unlikely to dive into the rear swing arm 4 because the caliper bracket 8A is extended and formed in the longitudinal direction of the rear swing arm 4. Therefore, the iron plate which was conventionally required can be removed.

Further, in the contact portion 20A of the caliper bracket 8A, a portion of the contact portion 20A facing the through hole 4a of the rear swing arm 4 through which the rear axle shaft 10 is passed is grooved so that the contact portion 20A has a concave cross section. Since it is 24, the contact portion 20 of the caliper bracket 8A with the rear swing arm 4 at the time of bolting
Even if the rear axle shaft 10 is tightened with a tightening force such that the pressure per unit area in A is larger than the pressure per unit area in the contact portion 20B of the rear swing arm 4 with the caliper bracket 8A, Even if the portions 20A ₁ and 20A ₁ are crushed or bite into the rear swing arm, the portions 20A ₁ and 20A ₁ have a step between the portions 20A ₁ and 20A ₁ , so that the groove 24 projects and the rear It does not hit the through hole 4a of the swing arm 4. Therefore, it is possible to prevent the chain adjuster from being hindered.

[0014]

According to the present invention, even when the rear brake caliper is mounted between the rear swing arm and the rear wheel hub even if the tightening force of the rear axle shaft is strong, the rear force of the caliper bracket is affected by this tightening force. It is possible to prevent the portion of the swing arm that faces the through hole from projecting more than the portion excluding the through hole, which can prevent the chain adjuster from being hindered and is required in the past. The iron plate that was once can be removed.

[Brief description of drawings]

FIG. 1 is a side view of a rear swing arm that employs a rear brake caliper mounting structure according to the present invention;

FIG. 2 is an enlarged exploded perspective view of a main part of FIG.

FIG. 3 is a diagram for explaining a conventional technique.

[Explanation of symbols]

 1A Rear brake caliper mounting structure 4 Rear swing arm 4a Through hole (for rear swing arm) 6 Rear wheel 8A Caliper bracket 10 Axle shaft 20A Contact part (for caliper bracket 8A) 20B Contact part (for rear swing arm 4) 24 Recess

Claims (1)

[Claims] 1. A mounting structure of a rear brake caliper in which a rear swing arm and a rear wheel are bolted with an axle shaft via a caliper bracket, wherein the caliper bracket and the rear swing arm are tightened when the bolt is tightened. The portion of the caliper bracket that contacts the rear swing arm is adjusted so that the pressure per unit area at the contact portion becomes smaller than the pressure per unit area at the contact portion of the rear swing arm with the caliper bracket. The contact portion of the caliper bracket is formed to extend in the longitudinal direction, and a portion of the contact portion facing the through hole of the rear swing arm through which the axle shaft is passed is recessed so that the cross section of the contact portion has a concave shape. age Rear brake caliper mounting structure characterized by