JPH10325430A - Pad for disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pad for a disc brake to reliably maintain a joining state between a lining material and a backing plate. SOLUTION: This pad 10 for a disc brake comprises a lining material 12; and a backing plate 11 joined with the lining material 12. A disc rotor is nipped between the operation part and the reaction part of a caliper positioned astride the outer peripheral part of a disc rotor and arranged opposite thereto movably in the axial direction of the disc rotor. The backing plate 11 has a non-circular binding hole 11b formed in the central part thereof and the lining material 12 has a protrusion part 12a inserted in the binding hole 11b. Since the engagement parts of the binding hole 11b and the protrusion part 12a are united into one at a central part, rigidity of the backing plate 11 is ensured and the pad 10 for a disc brake reducing the generation of brake squeal is manufactured, and a joining state is reliably maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake pad which presses against both sides of a disc rotor to perform braking.

[0002]

2. Description of the Related Art A disc brake has a functioning portion provided with a disc rotor rotating in the same direction as a wheel, a pressing means comprising a piston and a cylinder on both arm portions straddling the outer peripheral portion of the disc rotor, and a reaction opposing the working portion. And a disc brake pad sandwiching the disc rotor between the action portion and the reaction portion and movably opposed in the axial direction of the disc rotor, and a pressing force of the action portion. And a brake device for generating a frictional force between the pad and the disk rotor to brake the vehicle.

In general, the pad is constituted by a lining material and a back plate so that the lining material is not easily peeled off from the back plate by a braking torque or a braking heat at the time of sliding contact with the disk rotor. In a conventional disc brake pad, a lining material and a back plate are joined by a rivet or an adhesive. In particular, when the lining material and the backing plate are joined with an adhesive, the backing plate and the lining material are engaged with each other by the uneven means. That is, insert the convex part provided in the lining material into the binding hole provided in the back plate,
The bonding force of the adhesive is assisted against the shearing force applied to the bonding surface between the lining material and the back plate during braking. Such a prior art is disclosed, for example, in Japanese Utility Model Publication No. 6-50672.

[0004]

However, in the conventional disc brake pad, a plurality of binding holes are formed in the back plate, and a plurality of projections engaging with the binding holes are provided in the lining material. When a plurality of binding holes are provided, there is a problem that the rigidity of the back plate is reduced and brake squeal is likely to occur.

Accordingly, an object of the present invention is to provide a disc brake pad which secures the rigidity of the back plate, prevents brake squeal, and ensures the engagement between the binding hole and the projection to ensure the braking performance. Providing is an issue to be solved.

[0006]

A disk brake pad according to the present invention, which solves the above-mentioned problems, comprises a disk rotor sandwiched between a working portion and a reaction portion of a caliper straddling an outer peripheral portion of a disk rotor. A disc brake pad comprising a lining material movably opposed to the axial direction and a back plate joined to the lining material, wherein the back plate has one non-circular shape at the center thereof. It has a binding hole, and the lining material has a convex portion inserted into the binding hole.

In the pad for a disc brake according to the present invention, the lining material and the back plate are joined by inserting the lining material side convex portion into one non-circular back plate side binding hole at the center, and Since the plate has only one non-circular binding hole in the center, a more rigid back plate can be manufactured than when multiple binding holes are dispersed, thereby suppressing brake squeal and lining material. Reliable bonding with the back plate is achieved.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In a disc brake pad according to the present invention, it is preferable that a binding hole formed in a back plate is located on a non-pressing surface of a working portion of a caliper. According to this embodiment, the action portion presses the convex portion of the lining material engaged with only one binding hole, and has an effect of further ensuring the rigidity of the back plate.

The working portion is constituted by, for example, a pressing means composed of a cylinder and a piston, and presses the pad by driving the piston inserted into the cylinder hole with hydraulic pressure.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disc brake pad according to the present invention will be described below with reference to the drawings. As shown in FIG. 1, the disc brake pads 10 and 10 are provided on the facing portions of the action portion and the reaction portion of the caliper body 2 disposed so as to straddle the outer periphery of the disc rotor 1 rotating together with the wheels. Each is configured. The caliper body 2 is supported by a caliper bracket 3 so as to be movable in the axial direction of the disk rotor 1, and the caliper bracket 3 is fixed to the vehicle body on one side of the disk rotor 1.

The working portion of the caliper body 2 is provided with a cylinder hole opened to the disk rotor 1 side. The cylinder hole advances in the direction of the disk rotor 1 by, for example, a cup-shaped liquid pressure supplied to the bottom thereof. A piston is movably inserted in the axial direction of the disk. The cylinder portion of the cylinder hole is narrowly pressed by bifurcated reaction claws 2b, 2b extending radially inward from the bridge portion 2a of the caliper body 2. The reaction force claws 2b, 2b are also integral with the reaction portion. However, as shown in FIGS. 2 and 3, the disc brake pad 10 is a substantially rectangular body slightly longer in the circumferential direction of the disc rotor 1, A back plate 11 having ear pieces 11a, 11a, and having an elliptical binding hole 11b in the center;
A lining material 1 having the same elliptical trapezoidal projection 12a inserted into the binding hole 11b and having a shape slightly smaller than
2 and the back plate 11 and the lining material 12
The projection 12a is inserted into the binding hole 11b, and is joined via an adhesive. However, you may join with a rivet other than an adhesive. Note that the ear pieces 11a, 11
a is a pad receiving portion 3a of the caliper bracket 3;
The disk brake pads 10 are suspended so as to be movable in the axial direction of the disk rotor 1.

Further, the disc brake pads 10, 1
In the elliptical shape of the engagement portion between the binding hole 11b and the convex portion 12a at 0, the major axis coincides with the circumferential direction of the disk rotor 1, and the minor axis coincides with the radial direction of the disk rotor 1. That is, the binding holes 11 b of the back plate 11 are formed to be long in the length direction of the back plate 11. The lining material 12 is a semi-metallic compound in which various friction modifiers are mixed with a metal wire as a base material,
It is composed of an asbestos-based asbestos-resin mold system, a material based on an inorganic fiber such as glass fiber, or the like.
The convex portion 12a may be formed temporarily before joining to the back plate 11, or may be formed by pressure molding when joining the lining material 12 to the back plate 11. In any case, at the time of joining, it is formed to the same height as the depth of the binding hole 11b.

The above-mentioned disc brake pads 10, 10
The reaction force claws 2b, 2b, 2c of the caliper body 2 in which one of the action parts is moved to the piston, and the other is moved to the action part.
b, each is pushed toward the disk rotor 1 side.
Thus, the lining members 12 and 12 narrow the pressure on both side surfaces of the disk rotor 1 rotating in the direction of arrow A to perform the braking action.
The hatched portion shown in FIG. 4 indicates a surface pressed by the piston of the action section. As is clear from the figure, the binding hole 11b of the back plate 11 is formed on a portion that does not cover the surface pressed by the piston (the hatched portion in the drawing), that is, the non-pressing surface. When the binding hole 11b is formed on the pressing surface (the hatched portion in the figure), the piston directly faces the convex portion 12a of the lining member 12 inserted into the binding hole 11b.
When the braking force is applied in such a state, the piston presses the soft lining member at the binding hole 11b, so that the operation stroke of the piston becomes longer than when the back plate is pressed. That is, the braking force decreases. On the other hand, in this example, since the binding hole 11b is formed on the non-pressing surface, the operating stroke of the piston at the time of braking is shorter than that when the lining is directly pressed, and the braking force can be maintained. Further, the binding hole 11b of the back plate 11 is formed in a portion surrounded by a surface of the action portion pressed by the piston. By forming the binding holes in this way, the binding holes 11b of the back plate 11 and the protrusions 12 of the lining member 12 are formed during braking.
a is reliably prevented.

As described above, the binding holes 11b and the projections 12a of the disc brake pads 10, 10 are provided.
Since only one engaging portion is formed at the center of the rectangular body, it is possible to design the back plate 11 to have higher rigidity than when a plurality of engaging portions are provided. In particular, since the engaging portion in the embodiment has an elliptical shape that is long along the rectangular body of the pad body, the radially thick portion 11c of the disk rotor 1 can be widened, and the binding hole 11b and the convex portion 12a can be formed as a single unit. The rigidity of the back plate 11 is higher than in the case of forming a circular shape. Further, when the binding hole 11b and the projection 12a are formed in a single circle, the disc brake pads 10, 10 can easily rotate around the circular engagement portion when the joint surface is peeled off, and the lining material 12 may fall off from the back plate 11. Therefore, in the present disc brake pads 10, 10, the effect of preventing brake squeal is large by securing the rigidity of the back plate 11, and reliable joining between the lining material 12 and the back plate 11 can be achieved.

As another embodiment of the present invention, as shown in FIG. 5, the binding holes 13b of the rectangular back plate 13 may be formed in a rectangular shape along the same rectangular shape. This rectangular binding hole 13b
Also, the rigidity of the back plate 11 can be ensured.

[0016]

As described above, according to the present invention, in a disc brake pad composed of a lining material and a back plate, a binding hole for securing the rigidity of the back plate and a convex portion to be inserted thereinto are provided. By providing one non-circular engagement at the center of the pad, a pad with increased rigidity of the back plate and less brake squeal can be manufactured. Thereby, the joining between the lining material and the back plate is ensured.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram in which a disc brake pad according to one embodiment of the present invention is used for a disc brake.

FIG. 2 is a view showing the same disc brake pad.

FIG. 3 is a sectional view of the disc brake pad.

FIG. 4 is an explanatory view showing a surface on which the disc brake pad is pressed by an action portion.

FIG. 5 is a view showing a back plate of a disc brake pad according to another example of the present invention.

[Explanation of symbols]

10: pad for disc brake, 11: back plate, 11b
... binding holes, 12 ... lining material, 12a ... convex parts.

Claims (2)

[Claims] 1. A lining material which sandwiches the disk rotor between a working portion and a reaction portion of a caliper straddling an outer peripheral portion of the disk rotor, and is arranged to be opposed to the disk rotor so as to be movable in an axial direction of the disk rotor, and joined to the lining material. A back plate having a non-circular binding hole at a center portion thereof, and the lining material being inserted into the binding hole. Pads for disc brakes. 2. The disc brake pad according to claim 1, wherein the binding hole is located on a non-pressing surface of the action portion.