| 摘要 |
<p>A drum-in-hat brake assembly (10) having first (12) and second (14) brake shoes retrained on a backing plate (16) by first (18) and second (20) pins connected to the backing plate (16). First ends (22, 24) of the first (12) and second (14) brake shoes are aligned on the backing plate (16) by an anchor post (40) and connected to a reverse actuator (26). The reverse actuator (26) receives an input force to respectively move first (42) and second (44) friction pads associated with the first (12) and second (14) brake shoes into engagement with a drum (46) to effect a brake application. The reverse actuator (26) includes a first lever (52) and a second lever (54), each of which have a flat plate (60, 76) that extends through an opening (62) in the backing plate (16). A resilient member (90) located in the opening (62) maintians the flat plates (60, 76) in a plane perpendicular with the backing plate (16). A slot (66, 78) adjacent a first end (56, 72) of each lever (52, 54) respectively receives the first ends (22, 24) of the first (12) and second (14) brake shoes while a semi-circular indentation (70) on the first lever (52) receives a semi-circular projection (82) extending from the second lever (54). The second ends (58, 74) of the first (52) and second (54) levers are separated from each other by a predetermined distance. A spring (48, 50) acting through the first (12) and second (14) brake shoes which holds the semi-circular projection (82) in the semi-circular indentation (70) and urges the first ends (56, 72) of the first (52) and second (54) levers into engagement with each other in a rest position. A actuation cable (91) connected to the second ends (58, 74) provides an input force which causes of the first (52) and second (54) levers to pivoting about the semi-circular indentation (70) and move the second ends (58, 74) toward each other while the first ends (56, 72) correspondingly move away from each other to provide an input force to effect a brake application.</p> |
