Electrically operated drum brake

Details Electrically operated drum brake Electrically operated drum brake

1988-04-19

1989-07-25

Reger, Duane A.

Brakes

Operators

Electric and mechanical

188162, F16D 6527

Patent

active

048504599

ABSTRACT:
The electrically operated drum brake (10) comprises an electric motor assembly (80, 180) disposed between opposing ends (62, 72) of two brake shoes (12, 14), the electric motor assembly (80, 180) replacing both the hydraulic wheel cylinder and the parking brake strut and lever. The electric motor assembly (80, 100) comprises a housing (82, 182) having an interior opening (84, 184) in which is disposed an electric motor (86, 186). The electric motor (86) drives a planetary gear assembly (91) which operates a screw mechanism (102) that engages an end (72) of an adjacent brake shoe (14), the housing (82) engaging the other brake shoe (12). An alternative embodiment includes an electric motor (186) which drives a bearing drive member (198), the bearing drive member (198) having a bearing track (200) which receives a plurality of bearing balls (205). The bearing balls (205) engage a fixed bearing track (187) on the housing ( 182) and also a curved surface (202) on a rotatable bearing member (201). The rotatable bearing member (201) engages a screw mechanism (204) so that when rotation of the bearing balls (205) causes rotation of the rotatable bearing member (201), the screw mechanism (204) is displaced against a brake shoe (14) and, by reaction, the housing (182) is displaced against the other brake shoe (12).

REFERENCES:
patent: 1968585 (1934-07-01), Apple
patent: 2109091 (1938-02-01), Press
patent: 2555664 (1951-06-01), Stocker
patent: 3402308 (1968-09-01), Henschke
patent: 3809191 (1974-05-01), Woodward
patent: 4059779 (1977-11-01), Wistinghausen
patent: 4064978 (1977-12-01), Wunderlich
patent: 4071123 (1978-01-01), Courbot et al.
patent: 4175645 (1979-11-01), Brinkert
patent: 4658939 (1987-04-01), Kircher et al.

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