Brakes – With condition indicator – Electrical
Patent
1988-07-29
1989-07-25
Reger, Duane A.
Brakes
With condition indicator
Electrical
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.
Allied-Signal Inc.
Decker Ken C.
Palguta Larry J.
Reger Duane A.
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