BRAKE PAD ASSEMBLY

Abstract

This brake pad assembly (1) for disk brakes, in particular in rail vehicles, comprises a main plate (2), pad modules (3) attached to the plate, which have a friction lining (9) and a backing plate (10), means (16) for attaching a respective pad module (3) to the plate (2), a plurality of bushes (7), each attachment means being arranged in a respective bush (7), which is inserted into orifices (11,6) provided facing each other in the backing plate (10) and in the main plate (2), through an opening (8) in the friction lining (9). According to the invention, the orifice for receiving the bush in the main plate is a blind hole (6), a bore (15) with a smaller diameter than that of the blind hole (6) being provided in the bottom of said blind hole, said bore (15) passing through the main plate (2), a rivet (16) being inserted into said bore inside the bush (7), said rivet linking the main plate (2) and the backing plate (10). The present invention therefore makes it possible to produce a brake pad assembly in which the link between the pad module and the main plate has a structure that is as simple as possible, while being reliable.

Claims

1. Brake pad assembly (1) for disk brakes, in particular in rail vehicles, comprising a main plate (2), pad modules (3) attached to the plate, resting respectively on a diaphragm (14), which pad modules nave a friction lining (9) and a backing plate (10), this friction lining being attached to the backing plate (10), means (16) for attaching a respective pad module (3) to the plate (2), a plurality of bushes (7), each attachment means being provided in a respective bush (7), which is inserted in the orifices (11, 6) provided facing each other in the backing plate (10) and in the main plate (2), through an opening (8) of the friction lining (9), which has a greater diameter than the orifices (6, 11) provided facing each other, characterized in that the orifice for receiving the bush in the main plate is a blind hole (6), a bore (15) of a diameter smaller than that of the blind hole (6) being provided in the bottom of this blind hole, this bore (15) passing through the main plate (2), a rivet (16) being inserted into this bore inside the bush (7), this rivet linking the main plate (2) and the backing plate (10).

2. Brake pad assembly according to claim 1, characterized in that the bush (7) has, at one of the ends thereof, a flange-type edge (20), which rests, in the opening (8) of the friction lining (9), on the backing plate when the bush (7) is inserted into the blind hole (6) in the main plate (2), wherein the diameter surrounded by the flange (20) is greater than the inner diameter of the bush (7) such that is formed, between the flange (20) and the bush (7), a shoulder (19), which forms the stop for the closing head (18) of the rivet (16), while the head for positioning (17) the rivet (16) is located pressed into the main plate (2).

3. Brake pad assembly according to claim 1 or 2, characterized in that the main plate (2) is attached, at the opposite side of the friction lining (9), by means of at least one rivet (5), at a dovetailed guide element (4), configured to be inserted into the support of the brake pad assembly.

4. Brake pad assembly according to any one of claims 1 to 3, characterized in that is provided, remote from the orifice (11) receiving the bush (7), in the backing plate (10), another orifice (23) being used to receive a clamping rod (21), which is pressed into an orifice (22), provided facing the backing plate orifice (23), in the main plate (2).

5. Brake pad assembly according to any one of claims 1 to 4, characterized in that the diaphragm (14) rests, by the larger edge thereof on the periphery, on the main plate (2), and in that the smaller edge on the periphery bears on an annular-shaped shoulder (13) formed in the backing plate (10), concentrically surrounding the bush opening and is guided from said shoulder radially.

6. Brake pad assembly according to any one of claims 1 to 5, characterized in that each pad module (3) can be moved with respect to the main plate (2) in a perpendicular direction with respect to the main plate plane (direction Z) and is configured so that it can be moved by tilting with respect to the plane X-Y.

Description

[0020] The present invention is illustrated and explained in more detail below, using the appended figures, wherein:

[0021] FIG. 1 is a front and rear view of a half of the brake pad assembly composed of two pads;

[0022] FIG. 2 is an exploded view of the brake pad assembly;

[0023] FIG. 3 is a cross-section view of the linking and functional parts of the brake pad assembly;

[0024] FIG. 4 is a detail of FIG. 3 representing the movement directions of the pad modules.

[0025] FIG. 5 is a detail of FIG. 3 representing, on a larger scale, the blind hole and the bore provided in the plate of this pad assembly.

[0026] FIG. 1 represents a front and rear view of an assembly being used to equip a braking track composed of four individual and symmetrical brake pad assemblies, the respective brake pad assembly being provided with reference number 1. Each brake pad assembly 1 is composed of a main plate 2, on which are arranged, in this case, respectively four pad modules 3. Dovetailed guides 4 are attached on the side of the main plate 2, opposite the pad modules 3.

[0027] FIG. 2 illustrates the manner, according to which the individual pad modules 3 are attached to the main plate 2 or are linked to the latter. The dovetailed guides 4 are attached to the rivet means 5 at the main plate. On the side of the main plate 2, opposite the dovetailed guide, the bushes 7 are inserted into the blind holes 6. These bushes 7 are inserted, as well as will appear more clearly in FIG. 3, in the blind hole 6 through an opening 8 in the friction lining 9 of the pad module 3 and through an orifice in the backing plate 10 supporting the friction lining 9. The orifice in the backing plate 10 is assigned, the reference number 11. The orifice 11 surrounds an annular-shaped recess 12, which is formed for example by an operation of pressing the backing plate 10. During said shaping operation, a shoulder 13 is formed at the opposite side of the backing plate 10 with a parallel offset with respect to the annular-shaped recess 12, which shoulder also has an annular shape and surrounds the orifice 11. The annular shoulder 13 acts as support for the smaller edge at the periphery of a diaphragm 14, of which the larger edge at the periphery rests on the main plate 2.

[0028] A bore 15 extends from the blind hole 6, provided in the main plate 2, through the main plate 2. As FIG. 5 shows, the blind hole 6 is configured for receiving the bush 7. It leads to the upper face 2 of the main plate 2, namely to the face of this plate rotated towards the backing plate 10. From the bottom 6 of this blind hole 6, the abovementioned bore 15 extends towards the bottom in this FIG. 5, so as to lead to the inner face 2 of the plate, namely to the opposite face thereof to the backing plate 10. The diameter of this bore 15 is smaller than that of the blind hole 6, this bore and this blind hole being concentric, seen from above, in reference to FIG. 5.

[0029] A main rivet 16 is plugged by said bore 15 through the bush, up to into the opening 8 of the friction lining, the head for positioning 17 this rivet 16 being located pressed into the main plate 2, such that the surface of said head 17 is placed in the alignment with the surface of the main plate 2.

[0030] Through the riveting operation, the closing head 18 of the main rivet 16 is formed, which bears on a shoulder 19, which is arranged in the zone of the bush 7, which reaches into the opening 8 in the friction lining 9. In said zone, the bush 7 has a flange-type edge 20, which rests in the opening 8 on the backing plate 10 when the bush 7 is inserted in the blind hole 6. The inner diameter surrounding the flange-type edge 20 is, in this scope, greater than the inner diameter of the bush 7. The transition zone between the shoulder formed by the flange and the inner wall of the bush 7 is produced, in this scope, with a conical extension.

[0031] In order to prevent a torsion of the individual pad modules 3 around said link by riveting to the main rivet 16, a clamping rod 21 is provided, which is threaded, through an orifice 22 in the main plate 2, in a bore 23, provided facing said orifice 22, in the backing plate 10, which is extended in the manner of a blind hole in the friction lining 9, the clamping rod 21 reaching into the orifice 22 of the main plate 2 in the threaded state.

[0032] FIG. 4 represents a detail of FIG. 3, the possibility of vertically moving the pad module 3 against the force of the diaphragm 14 being represented by the arrow P1, while the arrow P2 indicates the possibility of moving by tilting in the plane X-Y of the main plate 2.

[0033] These movement possibilities guarantee that in the braking mode, the individual pad modules can be adapted to the modified surface of the brake disk.

LIST OF REFERENCE NUMBERS

[0034] 1 Brake pad

[0035] 2 Main plate

[0036] 2 Upper face of the main plate 2

[0037] 2 Lower face of the main plate 2

[0038] 3 Pad module

[0039] 4 Dovetailed guide

[0040] 5 Rivet

[0041] 6 Blind hole

[0042] 6 Bottom of the blind hole 6

[0043] 7 Bush

[0044] 8 Opening

[0045] 9 Friction lining

[0046] 10 Backing plate

[0047] 11 Orifice

[0048] 12 Annular-shaped recess

[0049] 13 Annular-shaped shoulder

[0050] 14 Diaphragm

[0051] 15 Bore

[0052] 16 Main rivet

[0053] 17 Positioning head

[0054] 18 Closing head

[0055] 19 Shoulder

[0056] 20 Flange-type edge

[0057] 21 Clamping rod

[0058] 22 Orifice

[0059] 23 Orifice