Disc brake and method for determining the braking force of a disc brake

• US 20050029056A1
• Filed: 09/27/2002
• Published: 02/10/2005
• Est. Priority Date: 10/01/2001
• Status: Abandoned Application

• Current Assignee: Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbm
• Original Assignee: Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbm
• Inventors: Baumgartner, Johann, Ganzhorn, Dirk
• Application Number:
  US10/491,429
• Publication Number:
  US 20050029056A1
• Time in Patent Office: Days
• US Class Current: 188/1.11L
• CPC Class Codes: B60T 13/741 acting on an ultimate actuator
• CPC Class Codes: F16D 2066/005 Force, torque, stress or strain
• CPC Class Codes: F16D 2125/26 Cranks
• CPC Class Codes: F16D 66/00 Arrangements for monitoring working conditions, e.g. wear, temperature

Abstract

The invention relates to disc brake comprising an actuator, which has a brake actuating lever and is located in a brake caliper and to a method for determining the braking force in braking operations using a disc brake. The invention is characterized in that at least one tension sensor is positioned at least on the brake actuation lever, on the brake actuator, on the brake caliper and/or on a brake anchor plate, said sensor being used to measure the tensions for determining the brake force. A location on the brake actuating lever is particularly suitable.

Claims

1-21. -21. (cancelled).

22. A disc brake, comprising:

a caliper;

a brake anchor plate supporting the caliper;

a brake application device having a brake actuating lever arranged in the caliper;

at least one tension sensor positioned on at least one of the brake actuating lever, the brake application device, the caliper, and the brake anchor plate, the at least one tension sensor measuring tension for determining a braking force.

23. The disc brake according to claim 22, further comprising a measuring circuit coupled to the at least one tension sensor, the measuring circuit analyzing tension signals from the at least one sensor.

24. The disc brake according to claim 22, wherein the tension sensor has at least one wire strain gauge.

25. The disc brake according to claim 24, wherein the tension sensor has several wire strain gauges.

26. The disc brake according to claim 22, wherein the tension sensor has at least one piezo element.

27. The disc brake according to claim 26, wherein the tension sensor has several piezo elements.

28. The disc brake according to claim 22, wherein the tension sensor includes at least one wire strain gauge or piezo element arranged on the brake actuating lever.

29. The disc brake according to claim 28, wherein several wire strain gauges or several piezo elements are arranged on the brake actuating lever.

30. The disc brake according to claim 22, wherein the brake actuating lever has a recess at one end adapted to accommodate a piston rod of a brake cylinder and has a lower eccentric section at another end;

and wherein the tension sensor includes at least one of a wire strain gauge and a piezo element arranged between the recess and the lower eccentric section.

31. The disc brake according to claim 22, wherein the tension sensor includes at least one wire strain gauge or piezo element distributed on a surface of the brake actuating lever that at least one of faces away from and faces toward a brake disc when in use.

32. The disc brake according to claim 22, wherein the tension sensor includes at least one wire strain gauge or piezo element arranged on an area of the caliper that straddles over the brake disc when in use.

33. The disc brake according to claim 32, wherein the tension sensor includes at least one wire strain gauge or piezo element arranged on a reward area of the caliper facing away from the brake disc when in use.

34. The disc brake according to claim 22, wherein the tension sensor includes at least one wire strain gauge or piezo element arranged on a separate cover housing forming part of the caliper.

35. The disc brake according to claim 22, wherein the tension sensor includes at least one wire strain gauge or piezo element arranged on horns of the brake anchor plate.

36. The disc brake according to claim 24, wherein the at least one wire strain gauge is arranged on a metal carrier plate adapted to be welded onto a measuring point of the disc brake.

37. The disc brake according to claim 24, wherein the at least one wire strain gauge is glued onto the disc brake.

38. The disc brake according to claim 26, wherein the at least one piezo element is pressed into bores formed in the disc brake with a defined fit.

39. The disc brake according to claim 23, wherein the measuring circuit comprises a measuring bridge in which a respective wire strain gauge forms resistors thereof.

40. The disc brake according to claim 23, wherein the measuring circuit includes an amplifier coupled to at least one of the wire strain gauges piezo element tension sensors and a measuring bridge.

41. The disc brake according to claim 40, wherein the amplifier is attached to at least one of the caliper, the brake anchor plate and the brake actuating lever.

42. The disc brake according to claim 23, wherein the measuring circuit includes a signal processing unit.

43. The disc brake according to claim 23, wherein the measuring circuit is coupled with a brake control unit.

44. The disc brake according to claim 23, wherein the measuring circuit is coupled via one of a data line, an IR path, and a radio path with a brake control unit.

45. The disc brake according to claim 40, wherein the amplifier is a miniature amplifier.

46. A method for determining a braking force in braking operations of a disc brake, the method comprising the acts of:

measuring tensions on at least one of a brake actuating lever, a brake actuator, a caliper, and a brake anchor plate of the disc brake; and

determining the braking force based upon the measured tensions.

47. A braking force determination device for use with a disc brake having a caliper, a brake actuating device having a brake actuating lever, and a brake anchor plate supporting the caliper, the device comprising:

a plurality of tension sensors adapted to be positioned on at least one of the brake actuating lever, the brake application device, the caliper and the brake anchor plate, said plurality of tension sensors generating tension signals;

a measuring circuit formed of the plurality of tension sensors, the measuring circuit providing a measured value output; and

a signal processing unit coupled with the measuring circuit for processing the measured value output to determine the braking force.

48. The braking force determination device according to claim 47, further comprising a brake control unit coupled to the signal processing unit.

49. The braking force determination device according to claim 48, wherein the brake control circuit is wirelessly coupled to the measuring circuit.