Self-adjusting brake actuator

Details Self-adjusting brake actuator Self-adjusting brake actuator

1988-09-27

1989-09-19

Oberleitner, Robert J.

Brakes

Wheel

Transversely movable

188196A, F16D 5100, F16D 6538

Patent

active

048672815

ABSTRACT:
A self-adjusting actuator is disclosed that utilizes a hydraulic system for adding necessary brake fluid to move brake actuating pistons sufficiently to bring brake linings into contact with a brake drum, regardless of how much wear has taken place on the linings. The self-adjusting actuator also incorporates a threaded plunger sleeve, interposed between an actuating piston and the brake shoes, to limit the retaction of the shoes away from the brake drum so as to maintain the proper running clearance after adjustment. The system incorporates a compensator piston having one face acting on incompressible brake fluid filling the chamber between the compensator piston, the actuating piston and a surrounding housing. An opposite face of the compensator is acted upon by pressurized brake fluid when the operator of the vehicle depresses the brake pedal. A normally closed valve is incorporated into the compensator piston such that, as the compensator piston approaches the end of its stroke, the valve is opened thereby allowing the brake fluid acting on the second side of the compensator piston to pass through the compensator piston and into the chamber.

REFERENCES:
patent: 2140752 (1938-12-01), La Brie
patent: 2208042 (1940-07-01), Nothiger
patent: 2345108 (1944-03-01), Goepfrich
patent: 2867089 (1959-01-01), Parmerlee
patent: 2928508 (1960-03-01), Rockwell
patent: 4416356 (1983-11-01), Osborne

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