Brake pad arrangement for disc brakes

Abstract

Brake pad assembly (10) for disc brakes with at least one spring pin (14) arranged on the rear side of the brake pad (12) and a spring element (16) that can be coupled to it, wherein the spring element (16) has a fastening section (18) with a receiving opening (20) for receiving the spring pin (14), wherein a profile (22) is formed on the surface of the fastening section (18) of the spring element (16) facing away from the brake pad (12), which engages with the spring element (16) when the spring pin (14) is plastically deformed to secure it and secures the spring element (16) in a predetermined position, wherein the surface of the fastening section (18) has at least sectionally around the receiving opening (20) an irregular surface structure (22) in the form of a toothing, knurling or ribbing, wherein the spring pin (14) is plastically deformable, in particular by riveting or crimping, wherein a positive-locking connection is formed between the spring pin (14) and the profiled surface (22) of the spring element (16) such that the spring pin (14) engages in the surface structure of the spring element.

Description

[0001] The invention relates to a brake pad arrangement for disc brakes with at least one spring pin arranged on the back of the brake pad and a spring element that can be coupled thereto, wherein the spring element has a fastening section with a receiving opening for receiving the spring pin.

[0002] Such an arrangement is known, for example, from EP 0 609 245 B1. In this brake pad arrangement, a projection is formed on a pad backing plate, protruding from the plane of the plate, for attaching a retaining spring by means of which the brake pad together with the plate-shaped brake pad carrier is held in a brake caliper arrangement. To attach the retaining spring to the pad backing plate, the retaining spring has an opening through which it can be placed over the projection and brought into the correct angular position. Once the retaining spring is in the correct position, the projection is riveted, i.e. plastically deformed, so that it widens out laterally and protrudes over the edges of the opening, pressing the retaining spring against the pad backing plate. During riveting, the section of the projection protruding through the opening is also deformed.The cross-section of the projection is also widened by the riveting until it touches the edges of the opening and adapts its shape to the square shape of the opening.

[0003] Despite being riveted, this retaining spring can twist out of its intended position or even become detached from the projection on the pad backing plate, as it is only held in position by the projection adapting to the shape of the opening. Particularly when operating a disc brake with a brake pad in accordance with EP 0 609 245 B1, the vibrations and impacts that occur in a vehicle can easily deform the opening of the retaining spring or the projection, making it impossible to prevent the retaining spring from twisting. Furthermore, after riveting, a visual inspection cannot reliably determine whether the cross-section of the projection has increased sufficiently and whether a sufficient form fit has been established between the two components.

[0004] DE 101 36 235 A1 discloses a spot-type disc brake with a holding device for a brake pad with at least one brake pad, which is movably guided and supported in a pad holder of the spot-type disc brake.

[0005] US 55 202 65 A concerns a brake pad for disc brakes with a wear sensor.

[0006] JP S64- 79 435 A concerns a brake pad for a brake.

[0007] It is therefore an object of the present invention to provide a brake pad arrangement in which a spring element is permanently held in its predetermined position in a rotationally secured manner and whose fastening can be checked.

[0008] This problem is solved with a brake pad assembly of the type initially described, in which a profile is formed on the surface of the fastening section of the spring element facing away from the brake pad. Upon plastic deformation of the spring pin, this profile engages with the spring element to secure the spring element and fixes the spring element in a predetermined position. During assembly, the spring pin is plastically deformed, just as in the prior art. Its material flows into the profile and, on the one hand, ensures anti-twist protection. On the other hand, it can be determined whether sufficient fastening of the spring element is ensured as a result of the plastic deformation of the spring pin.

[0009] The invention also provides that the surface of the fastening portion has an irregular surface structure, in particular in the form of a toothing, knurling, or fluting. In this context, it should be noted that the irregular surface structure according to the invention can be formed at least partially around the receiving opening.

[0010] To achieve the highest possible security against twisting and to permanently secure the spring element in a predetermined position, the invention provides for the spring pin to be plastically deformed by riveting or caulking, creating a positive connection between the spring pin and the profiled surface of the spring element. The plastic deformation deforms the spring pin in such a way that it engages the surface structure of the spring element and creates the aforementioned positive connection between these two components. Furthermore, as also indicated above, after riveting, it can be visually determined whether a sufficient positive connection has been established between the profiled surface and the spring pin.

[0011] Regarding the arrangement of the spring pin on the brake pad assembly, it can be provided that the spring pin is formed directly on the brake pad or a plate-shaped brake pad carrier, or as a separate component that can be attached to the brake pad, for example, in the form of a separate bolt. In this context, it should also be mentioned that the spring pin can have a rivet head.

[0012] For attaching the brake pad assembly to the brake piston of a disc brake, one embodiment of the invention provides that the spring element has a bracket portion with a locking formation at its end. Furthermore, for attaching the spring element to the brake pad assembly, according to a preferred embodiment of the invention, projections are formed on the brake pad, to which the spring element can be fastened by the spring pin, wherein in this case, the bracket portion of the spring element protrudes beyond the projections.

[0013] For positioning or centering the brake pad arrangement when attaching it to a brake or a brake piston, it can further be provided that the brake pad has positioning elements.

[0014] The invention further relates to a disc brake with a brake pad arrangement according to the invention.

[0015] A preferred embodiment of the invention is explained below with reference to the accompanying figures. They show: Fig. 1 a perspective partial view of a brake pad arrangement according to the invention; Fig. 2 a side view of the brake pad arrangement according to Fig. 1; Fig. 3 a front view of the brake pad arrangement according to Fig. 1; Fig. 4 a perspective overall view of the brake pad arrangement according to the invention.

[0016] Fig. 1 shows a brake pad assembly 10 with a spring pin 14 arranged on the back of the brake pad 12 and a spring element 16 after riveting of the spring pin 14. Furthermore, it can be seen from Fig. 1 shows a fastening section 18 of the spring element 16, which has an irregular surface structure 22 or a profile, at least in sections, around a receiving opening 20. The surface structure 22 can be designed, in particular, in the form of teeth, knurling, or fluting. A bracket section 24 is also provided on the spring element 16, with which the brake pad assembly 10 can be fastened to a brake piston (not shown) of a disc brake.

[0017] Fig. 1 further shows a projection 26 to which the spring element 16 can be fastened by the spring pin 14. It can also be seen that the end portion of the bracket section 24 protrudes beyond the projection 26 into the cross section of the brake pad 12.

[0018] To attach the spring element 16 to the brake pad 12, the spring element 16 is placed onto the spring pin 14. For this purpose, the spring element 16 receives the spring pin 14 with its receiving opening 20. The spring element 16 is brought with its fastening section 18 into a predetermined position on the projection 26. The spring pin 14 is then plastically deformed, i.e., riveted or caulked. Due to the plastic deformation, material of the spring pin 14 flows in the area of ​​the profiled surface 22 on the fastening section 18 of the spring element 16 and comes into positive engagement with it. As a result of its plastic deformation, the material of the spring pin 14 therefore flows into the interdental spaces of the profiled surface structure 22 of the fastening section 18.This creates a positive connection with the surface structure 22 of the fastening section 18, by means of which the spring element 16 is firmly and torsionally secured to the back of the brake pad 12.

[0019] Following the assembly described above, it can be checked by visual inspection whether a sufficient form fit has been established between the profiled surface 22 and the spring pin 14.

[0020] Fig. 2 shows a side view of the brake pad assembly 10 after riveting or caulking the spring pin 14. It can be clearly seen Fig. 2, that the cross section of the spring pin 14 has increased and with the irregular surface structure 22 not shown here, a positive connection has been established between the spring pin 14 and the surface structure of the fastening section 18 of the spring element 16. Fig. 2 also shows that the bracket portion 23 of the spring element 16 overlaps the brake pad 12 above the projection 26. The bracket portion 24 has a locking formation 28 at its end, which projects beyond the projection 26, through which the brake pad 12 can establish a locking connection with a corresponding counterpart on a brake piston (not shown) or a caliper assembly of a disc brake.

[0021] Fig. Figure 3 shows a front view of the brake pad assembly after riveting. This again shows the projection 26 on which the spring element 16 with its fastening section 18 is arranged, as well as the bracket section 24 projecting beyond the projection 26. It is further shown Fig. 3 the locking formation 28 on the bracket section 24 of the spring element 16.

[0022] Fig. Figure 4 shows a perspective overall view of the brake pad assembly 10, further clarifying the position of the spring elements 16 on the brake pad 12. The previously mentioned projections 26 are formed on the sides of the brake pad 12, to which the two spring elements 16 can be attached with their fastening sections 18 by means of the spring pins 14. The bracket section 24 of the spring elements 16 overlaps the brake pad 12 above the projections 26.

[0023] In Fig. 4 also shows positioning elements 30 for positioning or centering the brake pad assembly 10 on a brake piston (not shown) of a caliper brake assembly. The positioning elements 30 facilitate and accelerate assembly of the brake pad assembly, since corresponding counterparts to the positioning elements 30 are formed on the brake pistons.

Claims

[1] Brake pad arrangement (10) for disc brakes with at least one spring pin (14) arranged on the back of the brake pad (12) and a spring element (16) which can be coupled thereto, wherein the spring element (16) has a fastening section (18) with a receiving opening (20) for receiving the spring pin (14), wherein a profiling (22) is formed on the surface of the fastening section (18) of the spring element (16) facing away from the brake pad (12), which profiling engages with the spring element (16) upon plastic deformation of the spring pin (14) to fix the spring element (16) and fixes the spring element (16) in a predetermined position, wherein the surface of the fastening section (18) has, at least in sections around the receiving opening (20), an irregular surface structure (22) in the form of a toothing, a knurling or a ribbing, wherein the spring pin (14) is plastically deformable, in particular by riveting or caulking, whereby a positive connection is created between the spring pin (14) and the profiled surface (22) of the spring element (16) in such a way that the spring pin (14) engages in the surface structure of the spring element. [2] Brake pad arrangement (10) according to claim 1, characterized by that the spring pin (14) is formed directly on the brake pad (12) or is formed as a separate component that can be attached to the brake pad (12). [3] Brake pad arrangement (10) according to claim 1, characterized by that the spring pin (14) has a rivet head. [4] Brake pad arrangement (10) according to one of the preceding claims, characterized by that the spring element (16) has a bracket section (24) with a locking formation (28) at its end. [5] Brake pad arrangement (10) according to one of the preceding claims, characterized bythat projections (26) are formed on the brake pad (12), to which projections the spring element (16) can be fastened by the spring pin (14), wherein the bracket section (24) of the spring element (16) projects beyond the projections (26). [6] Brake pad arrangement (10) according to one of the preceding claims, characterized by that the brake pad (12) has positioning elements (30). [7] Disc brake with a brake pad arrangement (10) according to one of claims 1 to 4.

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