Disc brake lining wear sensor

Brakes – With condition indicator – Electrical

Patent

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Details

116208, F16D 6602

Patent

active

048504548

ABSTRACT:
A disc brake lining wear sensor (40) comprises a plastic encapsulated lining wear sensor (40) having a support bracket (42) which is attached to a support member (12) of the disc brake (10). The inner brake pad (16) has a peripherally projecting portion (17) and the caliper (22) has a peripheral caliper projecting portion (23). The sensor (40) extends axially from a longitudinal mid-portion (46) into two oppositely disposed and axially extending end portions (48, 50). Each of the end portions (48, 50) is connected with the mid-portion (46) by a sloped or ramped surface (52, 54). A metal conductor (55) is encapsulated within the wear sensor (40) and disposed adjacent the surfaces (52, 54) of the end portions (48, 50). As the inner (20) and outer (21) linings wear, the peripheral portion (17) of the inner brake pad (16) is displaced axially by the piston (24) of the caliper ( 22) so that the projecting portion (17) wears away or erodes the associated surface (54) of the sensor (40) and engages the metal conductor (55) to complete a circuit. Likewise, the caliper (22) moves axially away from the rotor (14) as the outer lining (21) wears and the peripheral caliper projecting portion (23) wears away the plastic material of the associated surface (52) to engage the metal conductor (55) and activate a warning circuit.

REFERENCES:
patent: 3649959 (1972-03-01), Sakata et al.
patent: 3961690 (1976-06-01), Schanz et al.
patent: 3986164 (1976-10-01), Hirai et al.
patent: 4174024 (1979-11-01), Hagiwara
patent: 4183012 (1980-01-01), Kimura
patent: 4311214 (1982-01-01), Haraikawa et al.
patent: 4658936 (1987-04-01), Moseley
patent: 4685540 (1987-08-01), Rath et al.

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