Brake actuator

Details Brake actuator Brake actuator

1990-10-26

1994-05-31

Oberleitner, Robert J.

Brakes

Wheel

Transversely movable

188 7955, F16D 6578

Patent

active

053161157

ABSTRACT:
A brake actuator has a housing containing tappets operable by a cam to apply brake shoes against a rotary brake drum. The housing defines a cavity to which lubricant is admitted. A flexible element which is not compressed at the maximum positive system lubricant pressure and is disposed within the cavity and subject to lubricant pressure. The element is movable during outward movement of the tappets to compensate for any increase in volume of the cavity caused by tappet outward movement. This avoids the occurrence of negative pressure in the cavity.

REFERENCES:
patent: 3722634 (1973-03-01), Osagawara et al.
patent: 4234172 (1980-11-01), Takahashi
patent: 4502572 (1985-03-01), Davidson et al.
patent: 4813516 (1989-03-01), Urban
patent: 5069313 (1991-12-01), Kato et al.
patent: 5094323 (1992-03-01), Mitchell

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