JP2764738B2 - Disk brake - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a disc brake used for a motorcycle.

BACKGROUND OF THE INVENTION In motorcycles, particularly motorcycles for traveling on uneven terrain, it is necessary to protect the disc brakes from obstacles on the road surface. In addition, it is necessary that this disc brake is hardly damaged even when it falls down.

(Object of the Invention) The present invention has been made in view of such circumstances,
It is an object of the present invention to provide a disc brake for a rear wheel of a motorcycle which is hardly hit by an obstacle when traveling on uneven terrain and is hardly damaged when the vehicle falls down.

(Constitution of the Invention) According to the present invention, it is an object of the present invention to provide a disk applied to a rear wheel of a motorcycle having a rear end held at a rear end of a rear arm whose front end is pivotally supported by a vehicle body frame and whose cross-sectional shape is wide in a vertical direction. A brake disc fixed to a rear wheel, a caliper bracket having a rear end held by a rear axle, located between the brake disc and the rear arm in a plan view, and extending forward and having a front portion locked to the rear arm; A caliper mounted between the rear arm and the rear wheel in plan view and attached to the caliper bracket so as to overlap with the rear arm in side view; and a hydraulic hose connected to the caliper within the width of the rear arm in side view. And a disc brake characterized by having a connection portion of Here, it is desirable that the caliper bracket is provided with an engagement piece that comes into contact with the upper surface of the rear arm, and this engagement piece is bolted to the upper surface of the rear arm.

(Embodiment) FIG. 1 is a side sectional view of an embodiment of the present invention, and FIG. 2 is a plan view of a part of the embodiment. FIG. 1 is a sectional view taken along the line II in FIG. 2, and FIG.
It is a cross section taken along the line II-II in the figure.

In these figures, reference numeral 10 denotes a rear arm, the front end of which is pivotally supported by a body frame (not shown) by a pivot shaft, and the rear wheel of which is attached to the rear end. Here, as is clear from FIGS. 1 and 2, the cross section of the rear arm 10 is wide in the vertical direction. Although there are a pair of left and right rear arms 10, only one on the right side is shown in the figure. An axle (rear axle) 12 is inserted through the rear arm 10, and a hub 14 of a rear wheel is rotatably held on the axle 12. That is, a collar 18 of a caliper bracket 16, a spacer 20, a bearing 22 and a space 24 are sequentially mounted on this axle 12, and a hub 14 is provided.
Is supported by a bearing 22. Carrier bracket
A rear end 16 is held between the brake disc 30 and the rear arm 10 and extends forward in a plan view (FIG. 2). The caliper bracket 16 is integrally formed with an engagement piece 16A that comes into contact with the upper surface of the rear arm 10, and the engagement piece 16A is bolted to the upper surface of the rear arm 10.
As a result, as described later, the brake reaction force applied to the caliper bracket 16 is applied to the rear arm 10 via the engagement piece 16A.
And the rotation of the caliper bracket 16 is regulated.

The axle 12 is positioned in the front-rear direction by a chain puller 26 within the long hole 10A at the rear end of the rear arm 10, and is fixed to the rear arm 10 by a nut 28.

Reference numeral 30 denotes a brake disk, which is bolted to an end surface of the hub 14 facing the caliper bracket 16. Numeral 32 denotes a caliper. As is clear from FIG. 1, the caliper bracket 16 is overlapped with the rear arm 10 in a side view.
It is fixed to. This caliper 32 is a brake disc
A brake pad 34 (FIG. 2) facing left and right to 30;
A hydraulic cylinder (not shown) for pressing the brake pad 34 against the brake disc 30 is provided. The hydraulic pressure generated by a brake pedal (not shown) is guided to this hydraulic cylinder via a connection portion 32A of a hydraulic hose shown in FIG. 1 and generates a braking force by pressing a brake pad 34 against a brake disc 30. . Here, the connection portion 32A of the hydraulic hose is located within the width of the rear arm 10 as seen from the side as apparent from FIG.

36 is a plate-shaped protector. The protector 36 is made of a hard resin or the like in a substantially fan shape, and
The caliper bracket is fastened by two bolts 38, 38 so as to be close to the outer surface of the shaft 30 and to be opposed in the axial direction.
It is bolted to 16. Here, the upper edge of the protector 36 is in contact with a contact surface 16B formed on the caliper bracket 16. The outer circumference of the protector 36 slightly protrudes from the lower edge of the brake disc 30 in the radial direction. As shown in FIG. 2, an inclined surface 36A having an appropriate angle α is formed on the surface of the protector 36 facing the brake disk 30 so as to gradually move away from the brake disk 30 in the radial direction. I have. This slope prevents the protector 36 from coming into contact with the brake disc 30 when an obstacle hits the protector 36 and the protector 36 curves toward the brake disc 30.

In FIG. 2, reference numeral 40 denotes a seal interposed between the spacer 20 and the hub 14, and reference numeral 42 denotes an O-ring interposed between the spacer 20 and the axle 12. Seal 40 prevents water from entering bearing 22. The O-ring 42 extends from the slot 10A to the axle 1
2 Prevents water from entering the hub 14 along the outer surface.

In this embodiment, if there is an obstacle on the road surface during traveling, the obstacle hits the protector 36 projecting below the brake disc 30 and the rear arm 10 covering the outside of the caliper 32 and the hydraulic hose connection 32A. In addition, even when falling, the rocks on the road surface may cause these protectors 30 and rear arms.
Hits 10. For this reason, brake disc 30 and caliper 3
2. No damage to the connection 32A of the hydraulic hose. When a strong impact is applied to the protector 36, the impact can be received not only by the bolt 38 but also by the contact surface 10A, and the impact is dispersed to protect the protector 36. In order to remove the rear wheel, the nut 28 of the axle 12 is removed, the axle 12 is pulled down in FIG.
Just drop it down with 24. At this time, since the protector 36 does not cover the radial direction of the brake disc 30, the brake disc 30 does not interfere with the protector 36, and the wheels can be easily removed.

(Effects of the Invention) As described above, the invention of claim 1 provides a caliper bracket which is located between a brake disc and a rear arm in a plan view and which has a front end thereof and which is engaged with a rear arm, the rear end being held by a rear axle. The caliper attached to this caliper bracket was arranged between the rear arm and the rear wheel so as to overlap with the rear arm in side view, so that the connection portion of the hydraulic hose was within the width of the rear arm in side view, Obstacles are less likely to hit these calipers and hydraulic hose connections and they are protected. Also, when the vehicle body falls, these are sufficiently protected. Here, the caliper bracket may be provided with an engagement piece that comes into contact with the upper surface of the rear arm, and the engagement piece may be bolted to the upper surface of the rear arm. (Claim 2)

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view of one embodiment of the present invention, and FIG.
FIG. 2 is a sectional view taken along line II. 12 Axle (rear axle), 16 Caliper bracket, 16A Engagement piece, 30 Brake disc, 32 Caliper, 34 Brake pad, 36 Protector.

Claims (2)

(57) [Claims] 1. A disc brake applied to a rear wheel of a motorcycle having a rear end held at a rear end of a rear arm having a front end pivotally supported by a body frame and having a wide cross section in a vertical direction, the rear arm being fixed to a rear wheel. A brake disc, a caliper bracket whose rear end is held by a rear axle and is located between the brake disc and the rear arm, and extends forward and has a front portion locked to the rear arm; A caliper attached to the caliper bracket so as to overlap with the rear arm in a side view, and a connecting portion of a hydraulic hose connected to the caliper within a width of the rear arm in a side view. And disc brake. 2. The disc brake according to claim 1, wherein the caliper bracket has an engagement piece that contacts the upper surface of the rear arm, and the engagement piece is bolted to the upper surface of the rear arm.