JPH037619Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improvement of a friction pad for a disc brake.

Prior Art In FIG. 3, an operating section having a hydraulic cylinder 31 and a reaction section having a reaction arm 32 are connected by a bridge section 33 in a state where they straddle a disc rotor 50 fixed to the wheel side of an automobile. The caliper body 30 is connected to the mounting hole 41,
The guide tubes 34, 34 are slidably fitted onto a sliding shaft (not shown) protruding from a bracket 40 having a bracket 41, so that the guide tubes 34, 34 are movably supported.
On both sides of the disc rotor 50, friction pads 20,
21 is disposed, and the piston cup (not shown) in the cylinder presses the friction pad 20 on the operating part side against the disc rotor 50 by the hydraulic pressure applied to the hydraulic cylinder 31 through the hydraulic oil inlet 35, At the same time, a floating type disc brake is known in which the wheels are braked by pressing the friction pad 21 on the reaction part side toward the disc rotor 50 by reaction.

In such a disc brake, the friction pad 20 has side edges 20c, 2 that protrude on both left and right sides of a back metal 20a that integrally holds the friction material 20b.
0c is the torque receiving part 4 provided on the bracket 40
The side edges 20c, 20c serve as pressure receiving surfaces for torque during braking. Due to this braking, the friction pad 20 on the operating part side moves toward the disc rotor side as the friction body (lining) wears, and the contact surface with the torque receiving part of the bracket decreases, so that the torque can be reliably received. Otherwise, the friction pads may become wedged between the disc rotor and the bracket, causing damage to the bracket. To avoid this situation, the bracket 40
If the torque receiving portion 42 is provided thicker on the side of the disc rotor 50, there is a disadvantage that the bracket becomes larger accordingly.

Therefore, as shown in FIG. 4, the side edges 20c,
20c, a bulge 20 protruding toward the non-disk side.
By providing d and 20d, the sliding surface 2
Friction pads with enlarged 0e and 20e are used, but the formation of these bulges is done by forging, which has the disadvantage that considerable post-processing is required to improve dimensional accuracy. be. Furthermore, in the case of a structure in which the side edge 20c is bent and protruded toward the non-disc side as shown in FIG. 5, in the initial stage of use, torque is received by the friction body 20b, and the number of friction bodies is reduced. There may be a step on the sliding surface,
There were some inconveniences such as poor slippage.

Structure of the invention The present invention has been developed in view of the above circumstances, and its gist is to provide a bracket provided on both sides of the back metal that holds the lining of the friction pad on the operating side in a floating type disc brake. By forming the sliding surface with a plurality of rectangular surfaces that protrude at regular intervals in the direction of reciprocating motion of the friction pad, it can be easily manufactured by press working and has a sufficient torque receiving surface. The object of the present invention is to provide a friction pad having the following properties. Hereinafter, one embodiment will be described in detail with reference to the drawings.

Figures 1A to 1C show a back plate 1 of a friction pad according to the present invention, in which side edges 3, 3 protruding from both sides of a substantially rectangular iron plate are provided as torque receiving surfaces in contact with the bracket. Sliding surfaces 2, 2 are provided. As shown in FIG. 1B, the sliding surfaces 2, 2 are constructed to have rectangular surfaces 2a, 2b protruding from the non-disc rotor side at a constant interval l. 8 is a lining of friction material, and 9 is a hole for filling the friction material provided in the back metal 1 to prevent the friction material from peeling off. The formation of such sliding surfaces 2, 2 is achieved by using a punch 10 having a recess 11 for securing the predetermined interval as shown in FIG.
It is formed in one operation using a corresponding die 12, and is further finished by performing a shaving process to ensure good sliding with the torque receiving portion 42 of the bracket 40.

In the above embodiment, there are two rectangular surfaces 2a and 2b that protrude from the plate surface of the back metal, but the number can be arbitrarily determined depending on the lengths of the side edges 3, 3.

Effects The friction pad according to the present invention can always ensure contact surfaces at multiple locations with the torque receiving portion of the bracket 40, so even if the lining decreases, concentration of stress at one point can be avoided. In addition, the width of the protruding rectangular surface can be greatly expanded compared to conventional ones, and even if the lining is worn out, it can reliably receive torque, and there is no friction pad between the disc rotor and the bracket. Accidents that could occur if the bracket gets damaged due to biting can be prevented.
Further, there is no need to increase the thickness of the torque receiving portion of the bracket toward the disc rotor, and it is possible to reduce the thickness in some cases. In addition, in terms of manufacturing, press working has the advantage that products with extremely high dimensional accuracy can be manufactured at low cost using two steps: punching and shaving finishing.

[Brief explanation of the drawing]

FIGS. 1A and 1C are a front view and a plan view, respectively, showing an example of the back plate of the friction pad according to the present invention. FIG. 1B is a sectional view taken along the line A-A in FIG.
FIGS. 3 to 5 are explanatory diagrams showing the prior art, respectively.

Claims (1)

[Scope of utility model registration request] A caliper body including an actuating part having a hydraulic cylinder and a reaction part having a reaction arm is movably pivoted on a bracket so as to straddle the disc rotor.
A friction pad on the operating side of a floating type disc brake in which friction pads are arranged on both sides of the disc rotor, and a sliding surface with the bracket provided on both sides of a back metal that integrally holds a friction material. A friction pad for a disc brake, characterized in that it has a plurality of substantially rectangular surfaces that protrude at predetermined intervals in the axial direction of the disc rotor.