FRICTION PAD BODY

Abstract

A friction pad body having a backing part and a friction part, which integrally consist of the same ceramic material, without a seam and joint. The ceramic material has a purity of at least 80% in relation to the total weight of the friction pad body. The friction pad body is preferably produced in the form of a sintered body by isostatic pressing so that a single-stage production process can be achieved.

Claims

1. A friction pad body comprising: a backing part; and a friction part, wherein the backing part and friction part integrally comprise a same ceramic material without any seam and joint.

2. The friction pad body according to claim 1, wherein the backing part protrudes laterally beyond the friction part at least on an attachment section.

3. The friction pad body according to claim 2, wherein at least one attachment cut-out is present in the attachment section.

4. The friction pad body according to claim 1, wherein the ceramic material comprises an oxide ceramic or a non-oxide ceramic.

5. The friction pad body according to claim 1, wherein the ceramic material comprises one selected from the group of aluminum oxide, aluminum nitride, silicon carbide, silicon nitride, or boron nitride, and boron carbide.

6. The friction pad body according to claim 1, wherein the ceramic material is free of reinforcement fibers.

7. The friction pad body according to claim 1 wherein the ceramic material comprises reinforcement fibers.

8. The friction pad body according to claim 7, wherein the reinforcement fibers comprise carbon fibers.

9. The friction pad body according to claim 1, wherein the ceramic material comprises a sintered ceramic material.

10. The friction pad body according to claim 1, characterized by being an isostatically pressed sintered body.

11. The friction pad body according to claim 1, characterized by being produced in a single-stage production process.

Description

[0016] Advantageous embodiments of the invention will be apparent from the dependent claims, the description and the drawings. Preferred exemplary embodiments of a friction lining will be described in detail hereafter based on the accompanying drawings. In the drawings:

[0017] FIG. 1 shows an exemplary embodiment of a friction lining body in a perspective view with a view of the backing part;

[0018] FIG. 2 shows the friction lining body from FIG. 1 in a perspective view with a view of the friction part;

[0019] FIG. 3 shows the friction lining body according to FIGS. 1 and 2 in a top view of the friction part; and

[0020] FIG. 4 shows a cross-sectional view through the friction lining body along intersecting line IV-IV of FIG. 3.

[0021] The figures illustrate an exemplary embodiment of a friction lining body 10, which is used in a friction brake. The friction lining body 10 can therefore also be referred to as a brake pad. The friction lining body 10 includes a backing part 11, which in the exemplary embodiment is designed as a backing plate 12. The backing plate 12 has a substantially planar rear surface 13. The friction lining body includes a friction part 14 on the side opposite the rear surface 13. On the side opposite the backing part 11, the friction part 14 includes a friction surface 15, which is made to bear against a brake component for generating a frictional force during a braking process. The friction part 14 has a constant thickness, as viewed perpendicularly to the friction surface 15 thereof. This can have an approximately cuboid or cube-like contour. The friction part can also be curved in an arc shape to conform to the contour of a brake disk.

[0022] The backing part 11 and, according to the example, the backing plate 12 protrude laterally beyond the friction part 14 in a direction parallel to the friction surface or the rear surface 13. In this region, the backing part 11 includes an attachment section 16. The backing part 11 or the backing plate 12 includes one or more attachment cut-outs 17 in the attachment section 16. According to the example, two attachment cut-outs 17 are designed as holes 18.

[0023] Another attachment cut-out 17 is open on the side and thus designed as an open cut-out 19. The open cut-out 19 can include at least one, and according to the example two detent projections 20 located opposite one another, whereby the cross-section of the open cut-out 19 is decreased in the location of the at least one detent projection 20. In this way, a force fit and/or a form fit can be established with a pin engaging in the cut-out 19.

[0024] The friction lining body 10 is made of an integrally produced body, without any seam and joint. In particular, no interface, separating surface or joining surface is present between the backing part 11 and the friction part 14. The friction lining body is produced from a ceramic material. The ceramic material preferably has a purity of at least 80 to 85%, or at least 90 to 95%. In the exemplary embodiment, the ceramic material is an oxide ceramic, for example aluminum oxide. As an alternative, however, the ceramic material can also be a non-oxide ceramic, such as a carbide or a nitride, for example aluminum nitride, boron nitride, silicon nitride, silicon carbide or boron carbide.

[0025] The friction lining body 10 is preferably composed of a sintered ceramic material. In particular, the friction lining body 10 is produced as an isostatically pressed, and preferably highly compressed sintered body. According to the example, the friction lining body 10 is produced in a single-stage pressing and sintering operation. A machining process for producing the attachment cut-outs 17 is dispensed with. Likewise, no post-processing for establishing the connection between the friction part 14 and the backing part 11 is necessary.

[0026] In addition to the ceramic material, it is possible to introduce additives, such as reinforcement fibers, into the ceramic material. In one exemplary embodiment, carbon fibers are embedded into the ceramic material as reinforcement fibers, whereby the mechanical stability and thermal conductivity can be improved. The proportion of such additives, based on the weight of the friction lining body 10, is no more than 5% or no more than 10% or no more than 15% or no more than 25%.

[0027] Apart from impurities, the ceramic material can also be free of additives, and in particular reinforcement fibers.

[0028] The chemical and/or mechanical and/or physical properties of the friction part 14 are identical to those of the backing part 11. During production, the same ceramic material, with or without additives, is used for both parts 11, 14.

[0029] The friction lining body has isotropic properties. In particular as a result of the isostatic pressing or hot isostatic pressing, a porosity is created which is advantageous for the use in a friction brake.

[0030] The invention relates to a friction lining body 10, comprising a backing part 11 and a friction part 14, which are integrally made of the same ceramic material, without any seam and joint. The ceramic material has a purity of at least 75% to 80%. The friction lining body is preferably produced by way of isostatic pressing in the form of a sintered body, so that a single-stage production process can be achieved.

LIST OF REFERENCE NUMERALS

[0031] 10 friction lining body [0032] 11 backing part [0033] 12 backing plate [0034] 13 rear surface [0035] 14 friction part [0036] 15 friction surface [0037] 16 attachment section [0038] 17 attachment cut-out [0039] 18 hole [0040] 19 open cut-out [0041] 20 detent projection