초록 ▼

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 as

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, 180) comprises a housing (82, 182) having an interior opening (84, 184) in which is disposed an electric motor (86, 186). The electric motor (86) drive 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).

대표청구항 ▼

A traction roller drive that may be operated by motor means, comprising a housing for said roller drive, the motor means connected with a bearing drive member, the bearing drive member engaging rotatably bearing means, the bearing means in bearing engagement with a portion at said housing and a rota

A traction roller drive that may be operated by motor means, comprising a housing for said roller drive, the motor means connected with a bearing drive member, the bearing drive member engaging rotatably bearing means, the bearing means in bearing engagement with a portion at said housing and a rotatable bearing member, the rotatable bearing member engaging output means and including about a periphery thereof a flexible bearing member which engages an interior surface of said housing, a first end of the housing being disposed oppositely from said output means, actuation of said motor means effecting operation of said output means so that the bearing means absorbs loading exerted upon the output means, and the bearing drive member including a curved track receiving the bearing means, a contact distance extendinq between said curved track and said portion which comprises a curved surface being different from a contact distance extending between said curved track and said rotatable bearing member so that rotation of said bearing means causes rotation of said rotatable bearing member.