Hydraulic wheel cylinder assemblies and drum brakes incorporatin

Details Hydraulic wheel cylinder assemblies and drum brakes incorporatin Hydraulic wheel cylinder assemblies and drum brakes incorporatin

1981-09-16

1983-11-22

Butler, Douglas C.

Brakes

Wheel

Transversely movable

188 795GE, 188106A, 188106F, 188196BA, 188343, 188364, F16D 6524

Patent

active

044163568

ABSTRACT:
A hydraulic wheel cylinder assembly is particularly for use in a drum brake of the kind in which the wheel cylinder assembly is interposed between one pair or adjacent ends of a pair of brake shoes and a mechanical expander and fixed abutment is interposed between the other pair of adjacent ends of the shoes. The wheel cylinder assembly incorporates a pair of piston assemblies each including an adjustable variable length tappet assembly comprising rotatable and un-rotatable screw-threaded components. The rotatable screw-threaded component can move axially relative to the driven member of a one-way drive mechanism by compression of a spring when a flange on the driven member strikes the wheel cylinder body. This provides a self-centering force which prevents drag when the brake is installed with the shoes one above the other.

REFERENCES:
patent: 3977500 (1976-08-01), Farr
patent: 4013150 (1977-03-01), Crabtree
patent: 4380277 (1983-04-01), Ingram et al.

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