Internal shoe drum brakes for vehicles

Details Internal shoe drum brakes for vehicles Internal shoe drum brakes for vehicles

1980-08-29

1983-01-25

Halvosa, George E. A.

Brakes

Operators

Multiple

188106F, 188326, 188327, 188334, 188363, 188364, 188196D, 192 75, 192 85AT, 192111T, F16D 6524

Patent

active

043698638

ABSTRACT:
An internal shoe-drum brake is disclosed in which a pair of arcuate shoes can be applied to a rotatable drum by an hydraulic actuation system for normal service braking when the brake acts as a brake of the "two-leading" shoe type and a mechanical actuation system for parking or emergency braking when the brake acts as a brake of the "duo-servo" type. The hydraulic system comprises two hydraulic pistons, each of which acts on the leading end of a respective shoe, and first and second abutments are provided against which the trailing ends of the shoes are adapted to rest. One abutment is fixed but the other abutment includes an auxiliary hydraulic piston which is adapted to be urged against a fixed stop by hydraulic pressure applied to the pistons. The reaction from the trailing end of a respective shoe tends to urge the piston away from the stop, but the area of the piston is sufficient to prevent this happening when the hydraulic pressure is acting on the piston. A floating mechanical strut acts between the shoes to transmit the reaction from the trailing end to the leading end when no hydraulic pressure is applied to the auxiliary piston.

REFERENCES:
patent: 1944490 (1934-01-01), Bowen
patent: 1986430 (1935-01-01), Frank
patent: 2140741 (1938-12-01), Goepfrich
patent: 2239916 (1941-04-01), Hart
patent: 2385812 (1945-10-01), Hoyt
patent: 2775315 (1956-12-01), Maruhn et al.
patent: 3744595 (1973-07-01), Adams
patent: 3811538 (1974-05-01), Farr
patent: 3838757 (1974-10-01), Farr

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