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, 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).

대표청구항 ▼

A drum rake that may be operated by motor means, comprising a housing having an interior opening receiving therein said motor means, 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 portio

A drum rake that may be operated by motor means, comprising a housing having an interior opening receiving therein said motor means, 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 of said housing and a rotatable bearing member, the rotatable bearing member engaging screw means and the screw means extending from the housing to connect with an adjacent end of a brake shoe, and a first end of the housing disposed oppositely from said screw means connected with an end of an adjacent brake shoe, so that actuation of said motor means effects axial displacement of said screw means which displaces the associated brake shoe and, by reaction effects axial displacement of said first end against the associated brake shoe.