Friction elements, especially for drum brakes

• US 4,694,937 A
• Filed: 02/28/1986
• Issued: 09/22/1987
• Est. Priority Date: 03/07/1985
• Status: Expired due to Term

• Current Assignee: Beral Bremsbelag GmbH
• Original Assignee: Beral Bremsbelag GmbH
• Inventors: Jonas, Siegfried
• Primary Examiner(s): Butler, Douglas C.
• Application Number:
  US06/834,395
• Time in Patent Office: 571 Days
• Field of Search: 188/73.1, 188/73.2, 188/250 G, 188/250 B, 188/251 R, 188/251 A, 188/251 M, 156/92, 156/276, 192/107 R, 192/107 M
• US Class Current: 188/73.1
• CPC Class Codes: F16D 2069/0433 Connecting elements not integral with the braking member, e.g. bolts, rivets
• CPC Class Codes: F16D 2069/0441 Mechanical interlocking, e.g. roughened lining carrier, mating profiles on friction material and lining carrier
• CPC Class Codes: F16D 69/04 Attachment of linings
• CPC Class Codes: F16D 69/0416 specially adapted for curved linings

Abstract

A friction element with a riveted friction lining, especially for highly stressed drum brakes, in which the mating surface (5) of the friction lining (2) to the lining carrier (1) and/or the opposing surface (6) of the lining carrier (1) to the friction layer (2) is provided with a multiplicity of particles (7) which are harder than the material of the opposing surface (6) of the lining carrier (1).

Claims

1. A friction element comprising a lining carrier and a friction lining rivated thereon, wherein between the mating surfaces of the friction lining and the lining carrier a multiplicity of particles are provided which particles are harder than the surface of the lining carrier, said particles being adhered to only one of said mating surfaces by means of a binder.

2. A friction element according to claim 1, wherein the particles have a grain size of 0.5 to 300 micrometers, preferably 1.0 to 40 micrometers.

3. A friction element according to claim 2, wherein the particles are grains of an abrasive material.

4. A friction element according to claim 3, wherein the particles are of corundum.

5. A friction element according to claim 3 wherein the particles are of silicon carbide.

6. A friction element according to claim 1 wherein the particles are bonded into a binder layer applied to the surface to which the particles are to be adhered.

7. A friction element according to claim 6, wherein the binder layer contains a binder consisting essentially of an adhesion primer which is stable at temperature up to 250°

C. and which exhibits no thermoplastic properties.

8. A friction element according to claim 7 wherein the binder layer has an application density of 0.001 to 0.06 g/cm², preferably 0.003 to 0.02 g/cm², measured on the solids content of applied dispersion.

9. A friction element according to claim 8 wherein the binder layer consists of a thermosetting resin, a curable rubber or mixtures thereof.

10. A friction element comprising:

a brake shoe,

a cured friction lining riveted to said brake shoe, and between the mating surfaces of said brake shoe and said lining,

a multiplicity of particles which are harder than the mating surface of the brake shoe, said particles adhered to one of said mating surfaces by a binder layer of an adhesive which is temperature stable to at least 250°

C. and exhibits no thermoplastic properties.

11. A friction element according to claim 10 wherein the binder consists essentially of a thermoset polymeric material selected from phenolic resin, epoxy resin and nitrile rubber.