Apparatus for the measuring and/or controlling of the wear on a component

• US 4,674,326 A
• Filed: 01/06/1986
• Issued: 06/23/1987
• Est. Priority Date: 01/23/1985
• Status: Expired due to Term

• Current Assignee: Wabco Westinghouse Fahrzeugbremsen GmbH
• Original Assignee: Wabco Westinghouse Fahrzeugbremsen GmbH
• Inventors: Reinecke, Erich
• Primary Examiner(s): MYRACLE, JERRY
• Application Number:
  US06/816,500
• Time in Patent Office: 533 Days
• Field of Search: 73/121, 73/129, 73/7, 340/52 A, 340/52 B, 340/, 188/1.11, 374/142, 303/20, 364/426
• US Class Current: 73/129
• CPC Class Codes: F16D 2066/001 Temperature
• CPC Class Codes: F16D 2066/006 without direct measurement of the quantity monitored, e.g. wear or temperature calculated form force and duration of braking
• CPC Class Codes: F16D 66/00 Arrangements for monitoring working conditions, e.g. wear, temperature
• CPC Class Codes: F16D 66/021 using electrical detection or indication means

Abstract

An improved arrangement for measuring and controlling the wear of the first member which is subject to wear during frictional contact with the second member. The unique arrangement employs a simple process which allows a direct measurement of wear with a minimum expenditure. The invention involves a method of measuring the temperature which is generated in the first member or in the second member or in an adjacent member, which is representative of the above-mentioned wear which occurs during frictional contact, and an evaluation circuit for converting the temperature values into wear signals.

Claims

1. An arrangement for measuring the amount of wear occurring on a first member which is worn during frictional contact with a second member comprising, at least one measurement element for generating output signals which are a function of the wear on said first member, said measurement element takes the form of a temperature sensor which is located on said first member and is adjacent to said second member, and an evaluation circuit for evaluating the temperature-dependent output signals produced by the temperature sensor and for providing wear signals indicative of the amount of wear occurring on said first member.

2. The arrangement, according to claim 1, wherein an indicator and a warning device are controlled by the wear signals.

3. The arrangement, according to claim 2, wherein said evaluation circuit and said indicator and warning device are interconnected over separate circuits so that said evaluation circuit as well as said indicator and warning device are selectively switched to monitor the wear on said first member.

4. The arrangement, according to claim 1, wherein said temperature sensor on said first member is located on an adjacent support member to measure the temperature of said first member.

5. The arrangement, according to claim 1, wherein said temperature sensor is located on an adjacent support component to measure the temperature of said adjacent support member.

6. The arrangement, according to claim 5, wherein a number of temperature sensors are located around said first member so that the temperature signal corresponds to the arithmetic average of the signals of the individual temperature sensors.

7. The arrangement, according to claim 1, wherein a series of characteristic curves are stored in said evaluation circuit which represent the temperature of said first member and the temperature of said second member before and after the frictional contact and wear of said first and second members so that said evaluation circuit determines the value of the wear signal on the basis of the temperature signals fed to it.

8. The arrangement, according to claim 7, wherein:

(a) signals representing the friction work, which is performed during the frictional engagement, are fed to said evaluation circuit, and

(b) said evaluation circuit is designed so that it is programmed with these parametric characteristics.

9. The arrangement, according to claim 1, wherein said first member and said second member form a wheel brake system of a motor vehicle, and wherein said first member is the brake lining which is supported on a carrier plate, and said second member is the associated brake drum.

10. The arrangement, according to claim 9, wherein the arrangement is a brake system of a motor vehicle which is designed as a fluid-operated wheel brake.

11. The arrangement, according to claim 10, wherein:

(a) a plurality of temperature sensors are disposed on at least two wheel brakes, and

(b) said evaluation circuit includes a comparing and regulating circuit, which compares the temperature signals fed to it by the temperature sensors of the wheel brakes, with one another or with a command value derived from the series of characteristic curves, and includes appropriate pressure regulating valves which control the braking pressure of the various wheel brakes in the sense of an equalization of the temperature signals and thereby the wear of their brake linings with the command value.

12. The arrangement, according to claim 11, wherein the series of characteristic curves represent the partial weights of the various wheel brakes of the motor vehicle, and said evaluation circuit calculates and stores corrected values which are derived from the differences of the braking pressures being fed to the different wheel brakes based on the temperature signals received during and after one or more previous brake applications, and based on the load and velocity signals received during the previous brake application and when the respective brake is activated and causes the control of the braking pressures of the different wheel brakes using the corrected values for controlling the pressure control valves.

13. The arrangement, according to claim 12, wherein said evaluation circuit updates the corrected values on the basis of the temperature signals fed to it during or after the application of the brake, and on the basis of the load or velocity signals received during the application of the brake.