BRAKE SHOE HAVING A WEAR INDICATOR

Abstract

The invention relates to a brake shoe (1) for disk or drum brakes, which comprises a supporting plate (2) with a friction pad (3) attached thereto and at least one wear indicator (4), characterized in that the wear indicator (4) has a wear sensor (6) for continuous or multi-stage measurement of the wear of the friction lining and a receiver and transmitter unit (5) for wireless signal transmission, the receiver and transmitter unit being a passive RFID (Radio Frequency Identification) or SAW (Sound Acoustic Wave) transponder.

Claims

1. A brake shoe (1) for disc brakes or drum brakes, comprising: a carrier plate (2) with a friction lining (3) attached thereto; at least one wear indicator (4), said wear indicator configured as a sheath embedded into the friction lining (3) and having a wear sensor (6) to measure the wear of the friction lining continuously or in increments; and a receiver-transmitter unit (5) for wireless signal transmission.

2. The brake shoe (1) according to claim 1, wherein the receiver-transmitter unit (5) is an RFID (radio frequency identification) transponder or a SAW (sound acoustic wave) transponder.

3. The brake shoe (1) according to claim 2, wherein the RFID transponder is a passive transponder.

4. The brake shoe (1) according to claim 2, wherein the receiver-transmitter unit (5) is a SAW transponder.

5. The brake shoe (1) according to claim 1, further comprising several conductor loops in the wear sensor (5).

6. The brake shoe (1) according to claim 1; futher comprising temperature sensor (9) as a component of the wear indicator (4).

7. The brake shoe (1) according to claim 1, further comprising a maximum-temperature storage element (7) as a component of the wear indicator (4).

8. The brake shoe (1) according to claim 1, wherein the wear indicator (4) has a cylindrical or conical shape.

9. The brake shoe (1) according to claim 1, wherein the wear indicator (4) has a maximum diameter ranging from 10 mm to 30 mm.

10. The brake shoe (1) according to claim 1, wherein the wear indicator (4) is made of the same material as the friction lining (3).

11. The brake shoe (1) according to claim 1, wherein the wear indicator (4) is installed in a through-opening in the carrier plate (2).

12. A wear indicator (4) for a brake shoe (1) according to claim 1.

13. (canceled)

14. A method for the production of a brake shoe (1), comprising the following steps: a) making a through-opening or a depression in the carrier plate (2), said carrier plate having a friction lining side adapted to receive a friction lining (3); b) inserting a wear indicator (4) into the through-opening or depression on the friction lining side, said wear indicator configured as a sheath embedded into the friction lining (3) and having a wear sensor (6) to measure the wear of the friction lining continuously or in increments, and a receiver-transmitter unit (5) for wireless signal transmission; and c) pressing the friction material (3) onto the carrier plate (2) that surrounds the wear indicator (4).

Description

DESCRIPTION OF THE DRAWING

[0036] An embodiment of the invention is explained in detail below making reference to the drawing.

[0037] FIG. 1 shows a cross-sectional view of the brake shoe according to the invention as well as the wear indicator or the sheath according to the invention.

DETAILED DESCRIPTION

[0038] The brake shoe 1 shown in FIG. 1 consists of a carrier plate or lining carrier 2, with a friction lining 3 which is applied onto the lining carrier plate 2, and with a wear indicator 4 which is embedded into the friction lining 3. This wear indicator 4 is installed in a through-opening in the carrier plate 2 and it has a wireless receiver-transmitter unit 5 (RFID tag or SAW tag), a wear sensor 6 that works continuously or in increments (as shown here in the form of conductor loops) and a maximum-temperature storage element 7 as well as a temperature sensor 9. The filler and the material 8 that surrounds these elements 5-7 and 9 and that forms the outer shell of the wear indicator 4 is made of the same friction material as the friction lining 3 itself.