Brake lining wear sensor and indicator circuit

Details Brake lining wear sensor and indicator circuit Brake lining wear sensor and indicator circuit

1984-09-10

1986-08-19

Stoner, Jr., Bruce H.

Brakes

With condition indicator

Electrical

340 52A, 340 66, F16D 6600, B60Q 100

Patent

active

046064354

ABSTRACT:
A brake lining wear sensor includes a metal contact secured to a grounded brake lining support plate through a semiconductor ceramic bushing containing silicon carbide and silicon nitride which establishes an electrical resistance between the contact and the support plate so that the contact has a resistance to ground when the brake lining is not worn, but when the brake lining is worn and the contact touches a grounded brake rotor or drum, a short to ground occurs. The sensor is coupled by a lead wire to an indicator circuit which tests for the resistance value in the circuit path to ground to determine whether the contact is connected to the indicator circuit and whether it is electrically grounded to the rotor. An indicator lamp comprises a tri-color LED to emit different colors signifying a normal condition, an open circuit or a worn brake lining condition.

REFERENCES:
patent: 2217176 (1940-10-01), Madison
patent: 3052814 (1962-09-01), Edwards et al.
patent: 3271737 (1966-09-01), Bezemek
patent: 3641546 (1972-02-01), Blackburn
patent: 3673588 (1972-06-01), Riff
patent: 3813665 (1974-05-01), Parfomak et al.
patent: 4184145 (1980-01-01), Fima
patent: 4204190 (1980-05-01), Wiley et al.
patent: 4241603 (1980-12-01), Man et al.
patent: 4298857 (1981-11-01), Robins et al.
patent: 4387789 (1983-06-01), Borugian

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