| 摘要 |
An automatic slack adjusting mechanism for a rotary oscillatory cam (18) actuated brake assembly (10) including an elongated housing having an opening (41) therethrough and a bore (42), a worm gear (74) rotatably mounted in the opening (41), a shaft mounted for rotation in the bore and having a worm (45) nonrotatably secured thereto and drivingly engaging the gear (74). The opening (41) includes a first (114), second (116) and third bore (140) having successively smaller diameters and forming flanges intermediate thereof. The worm gear (74) has a circumferential portion and two annular face portions (120, 122) which define bearing surfaces. The worm gear (74) is maintained in sliding relation with the second bore (116) and a first intermediate flange (131) by an annular retainer (132) which is disposed in the third bore (140) in abutting relation with a second intermediate flange. The retainer (132) includes an annular channel formed from two coaxial axially extending portions connected by a radially extending portion which is filled with an elastomeric material (38) which forms an annular face seal (136) maintained proximate an annular face (120) of the worm gear. The opposing annular faces (122) include seals (130) which cooperatively define a sealed area which extends radially inwardly of said annular face portions (122).
|
