Friction pad body

Abstract

This invention relates to a friction pad body (10) comprising a backing portion (11) and a friction portion (14), said backing portion and friction portion being integrally constructed of the same ceramic material without any seams or connections. The ceramic material has a purity of at least 80% relative to the total weight of the friction pad body. The friction pad body is preferably produced by isostatic pressing in the form of a sintered body, thereby enabling a single-stage production process.

Description

[0001] This application is a divisional application of Chinese patent application filed on October 9, 2019, entitled "Friction Pad Body" with application number 201880024012.4. Technical Field

[0002] This invention relates to a friction liner body used in a friction brake. The friction liner body can also be referred to as a brake pad. Background Technology

[0003] Friction pad bodies for friction brakes are known. For example, DE 38 03 069 A1 describes a friction pad body for a disc brake. The friction pad body includes a backing plate, which contains the friction pads. The backing plate is typically made of metal, such as steel. The brake pads are made of a material suitable for friction mating with the brake disc. To prevent oxidation of the backing plate due to contact with the brake caliper, it is recommended to provide a suitable metallic layer on the backing plate to avoid contact corrosion with the brake caliper material.

[0004] DE 103 58 320 A1 recommends that the friction pad be integrally and shape-locked to the backing. Reinforcing fibers are provided during the process, penetrating the interface between the backing and the friction pad. For example, reinforcing fibers present in the friction pad are needle-punched into the layers of the backing and additionally cause a shape fit between the layers of the backing and the friction pad. Summary of the Invention

[0005] Based on this, it can be considered that the objective of the present invention is to create a friction liner body that is very easy to manufacture while meeting the mechanical and thermal requirements during use in a friction brake.

[0006] This objective is achieved by a friction liner body having the features of claim 1.

[0007] The friction liner body comprises a backing portion and a friction portion, both integrally formed from the same ceramic material without any seams or connections. There is no transition surface or transition region between the backing portion and the friction portion. The ceramic material used to form the friction liner body does not form a separating or connecting layer between the backing portion and the friction portion. Specifically, the friction liner body is produced by sintering to form a sintered body. The friction liner body is preferably an isostatically sintered body.

[0008] Because the backing and friction components of the friction pad body are designed as a single unit, there is no stress caused by heating due to the difference in coefficients of thermal expansion during braking. When the ceramic friction pad body is used in brake calipers, contact corrosion does not occur as is seen with metal backing components in related fields.

[0009] The ceramic material preferably has a purity of at least 75%, at least 85%, or at least 95%.

[0010] The friction liner body is specifically made of highly compressed sintered ceramic material. The ceramic material preferably has a density of approximately 3 to 6 g / cm³. 3 The density.

[0011] Ceramic materials possess excellent mechanical and thermal properties suitable for use as friction liner bodies. By adding coloring agents during sintering, friction liner bodies can also be produced in colored forms without the need for painting. Precise geometries can be achieved easily through pressing and sintering.

[0012] As an alternative to producing the friction lining body from sintered ceramic materials, it can also be produced from reactive ceramic materials.

[0013] Preferably, the ceramic material used is an oxide ceramic material, such as alumina. The use of alumina allows for a relatively high coefficient of sliding friction in the range of approximately 0.4 to 0.7, depending on the material pairing.

[0014] Non-oxide ceramic materials, such as aluminum nitride, silicon carbide, silicon nitride, boron nitride, or boron carbide, can also be used. The use of alumina and silicon carbide has the advantage of having a low coefficient of thermal expansion when the friction lining is heated during braking.

[0015] In a simplified embodiment of the friction liner body, reinforcing fibers are preferably absent. This simplifies manufacturing. In modifications, reinforcing fibers, particularly carbon fibers, can be arranged within the ceramic material of the friction liner body. This increases shear strength. Furthermore, the carbon fibers improve thermal conductivity and enable a more uniform heat distribution within the friction liner body.

[0016] In one exemplary embodiment, the backing portion includes an attachment section that laterally protrudes beyond the friction portion. At least one attachment recess can be present in the attachment section for attaching the friction pad body to a brake caliper or to another retaining member. Attached Figure Description

[0017] Advantageous embodiments of the invention will become apparent from the dependent claims, description, and drawings. Preferred exemplary embodiments of the friction liner will then be described in more detail based on the drawings. In the drawings: Figure 1 An exemplary embodiment of the friction pad body is shown in perspective from the backing portion; Figure 2 Presented in a three-dimensional view from the perspective of the friction area. Figure 1 The main body of the friction lining; Figure 3 A top view of the friction section is shown according to... Figure 1 and Figure 2 The friction lining body; and Figure 4 Show along Figure 3 The intersection line IV-IV passes through the cross section of the friction liner body. Detailed Implementation

[0018] The accompanying drawings illustrate an exemplary embodiment of a friction pad body 10 used in a friction brake. The friction pad body 10 can therefore also be referred to as a brake pad. The friction pad body 10 includes a backing portion 11, which is designed as a backing plate 12 in the exemplary embodiment. The backing plate 12 has a substantially planar rear surface 13. The friction pad body includes a friction portion 14 on a side facing away from the rear surface 13. On the side facing away from the backing portion 11, the friction portion 14 includes a friction surface 15 formed to abut against a braking element for generating friction during braking. When viewed perpendicularly to its friction surface 15, the friction portion 14 has a constant thickness. This allows for an approximately cuboid or cubic profile. The friction portion can also be curved in an arcuate shape to conform to the profile of the brake disc.

[0019] The backing portion 11 and, according to this example, the backing plate 12, laterally protrude beyond the friction portion 14 in a direction parallel to the friction surface or rear surface 13. In this region, the backing portion 11 includes an attachment section 16. The backing portion 11 or the backing plate 12 includes one or more attachment cutouts 17 in the attachment section 16. According to the example, two attachment cutouts 17 are designed as holes 18.

[0020] Another attachment notch 17 opens on the side and is therefore designed as an open notch 19. The open notch 19 can include at least one and, according to this example, two stop protrusions 20 positioned opposite each other, whereby the cross-section of the open notch 19 decreases at the location of the at least one stop protrusion 20. In this way, a force fit and / or form fit can be established using a pin engaged in the notch 19.

[0021] The friction liner body 10 is manufactured as a single piece without any seams or joints. Specifically, there are no interfaces, separating surfaces, or connecting surfaces between the backing portion 11 and the friction portion 14. The friction liner body is made of a ceramic material. The ceramic material preferably has a purity of at least 80% to 85% or at least 90% to 95%. In an exemplary embodiment, the ceramic material is an oxide ceramic, such as alumina. However, as an alternative, the ceramic material can also be a non-oxide ceramic, such as a carbide or nitride, for example, aluminum nitride, boron nitride, silicon nitride, silicon carbide, or boron carbide.

[0022] The friction liner body 10 is preferably made of sintered ceramic material. Specifically, the friction liner body 10 is produced as an isostatically pressed and preferably highly compressed sintered body. According to an example, the friction liner body 10 is produced in a single-stage pressing and sintering operation. The processing steps for producing the notch 17 are omitted. Similarly, post-processing for establishing the connection between the friction portion 14 and the backing portion 11 is unnecessary.

[0023] In addition to ceramic materials, additives such as reinforcing fibers can be introduced into them. In one exemplary embodiment, carbon fibers are embedded in the ceramic material as reinforcing fibers, thereby improving mechanical stability and thermal conductivity. Based on the weight of the friction liner body 10, the proportion of such additives is no more than 5%, no more than 10%, no more than 15%, or no more than 25%.

[0024] Apart from impurities, ceramic materials can also be free of additives, and especially free of reinforcing fibers.

[0025] The chemical and / or mechanical and / or physical properties of the friction part 14 are the same as those of the backing part 11. During production, the same ceramic material (with or without additives) is used for both parts 11 and 14.

[0026] The friction lining body has isotropic properties. In particular, due to isostatic pressing or hot isostatic pressing, a porosity is created that is beneficial for use in friction brakes.

[0027] This invention relates to a friction liner body 10, comprising a backing portion 11 and a friction portion 14, said backing portion 11 and friction portion 14 being integrally formed from the same ceramic material without any seams or connections. The ceramic material has a purity of at least 75% to 80%. The friction liner body is preferably produced by isostatic pressing in the form of a sintered body, thereby enabling a single-stage production process.

[0028] List of reference numerals in the attached diagram: 10 Friction Liner Body 11 Backing section 12 Backing Board 13 Rear Surface 14 Friction Part 15 Friction Surface 16 Attached Section 17. Attachment incision 18 holes 19. Opening incision 20. Stopper protrusion.

Claims

1. A friction liner body (10) It includes a backing portion (11) and a friction portion (14), which are integrally made of the same ceramic material without any seams or connections.

2. The friction liner body according to claim 1, Its features are, The backing portion (11) protrudes laterally beyond the friction portion (14) at least on the attachment section (16).

3. The friction liner body according to claim 2, Its features are, At least one attachment cut (17) exists in the attachment segment (16).

4. The friction pad body according to any one of the preceding claims, Its features are, The ceramic material is designed to be an oxide ceramic or a non-oxide ceramic.

5. The friction pad body according to any one of the preceding claims, Its features are, The ceramic material used is alumina, aluminum nitride, silicon carbide, silicon nitride, boron nitride, or boron carbide.

6. The friction pad body according to any one of the preceding claims, Its features are, The ceramic material does not have reinforcing fibers.

7. The friction pad body according to any one of claims 1 to 5, Its features are, The ceramic material includes reinforcing fibers.

8. The friction liner body according to claim 7, Its features are, The reinforcing fiber is formed of carbon fiber.

9. The friction pad body according to any one of the preceding claims, Its features are, The ceramic material is a sintered ceramic material.

10. The friction pad body according to any one of the preceding claims, Its features are, The friction lining body is an isostatically sintered body.

11. The friction pad body according to any one of the preceding claims, Its features are, The friction liner body is produced in a single-stage manufacturing process.

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