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    • 5. 发明公开
    • Drum brake having duo mode
    • 鼓式制动器采用duo模式
    • EP0063513A1
    • 1982-10-27
    • EP82400604.3
    • 1982-04-01
    • THE BENDIX CORPORATION
    • Colpaert, James John
    • F16D65/09F16D65/22F16D51/20
    • F16D65/22F16D51/24F16D51/50F16D65/09F16D2125/60F16D2125/62
    • A drum brake assembly includes a pair of brake shoes (20-22) which are carried by a backing plate (12) and engageable with a hydraulic actuator (16). The hydraulic actuator (16) is operable to move the pair of brake shoes (20-22) from a rest position to a braking position. A strut (36) extending between the pair of brake shoes cooperates with a parking arm (40) to move the pair of brake shoes to the braking position during a parking brake application. A support assembly on the backing plate (12) is disposed opposite the hydraulic actuator (16) for the purpose of absorbing braking torque developed by the pair of brake shoes. The support assembly (18) comprises a pair of slots and a lever (54). The lever is movable in response to movement of the parking arm (40) to adjust the position of the pair of blocks (50-52) relative to each other. In a first position the blocks are in abutment with the backing plate (12) while in a second position the blocks are free to move a limited amount relative to the backing plate. Moreover, the lever imparts a separating force to the pair of brake shoes via the blocks during a parking brake application to expand the brake shoes radially. This expansion is in addition to the movement imparted to the brake shoes by the strut (36) and parking arm (40).
    • 鼓式制动器组件包括由背板(12)承载并可与液压致动器(16)接合的一对制动蹄(20-22)。 液压致动器(16)可操作以将一对制动蹄(20-22)从静止位置移动到制动位置。 在一对制动蹄之间延伸的支柱(36)与驻车臂(40)配合以在停车制动器施加期间将该对制动蹄移动到制动位置。 为了吸收由所述一对制动蹄形成的制动转矩,背板(12)上的支撑组件设置在液压致动器(16)的对面。 支撑组件(18)包括一对槽和杠杆(54)。 杠杆可响应驻车臂(40)的移动而移动,以调节一对木块(50-52)相对于彼此的位置。 在第一位置,块体与背板(12)邻接,而在第二位置,块体相对于背板自由移动有限的量。 此外,在驻车制动应用期间,杠杆经由块向一对制动蹄施加分离力,以径向扩张制动蹄。 除了通过支柱(36)和驻车臂(40)传递给制动蹄的运动之外,这种扩展也是如此。