| 摘要 |
A spreading wedge actuator for vehicle brakes includes a housing (11) mounted on a brake carrier, two coaxial pressure members (2, 3) displaceably mounted in the housing (1) and abutting at outer ends against the brake operating members, a spreading wedge (8), between and abutting via rollers (4, 5) against inner ends of the two pressure members (2, 3) and extending outward through an opening (6) in a housing neck (7), a spreading-wedge shaft (9) operated by a diaphragm cylinder or similar device for reciprocating the spreading-wedge to operate the pressure members (2, 3) and thus the brakes, and a sealing device between the spreading-wedge shaft (9) and the housing neck (7) with a frustoconically shaped flexible sealing member (10) extending via a diversion area (15) between two ring shaped rims (11, 12) at its ends having different diameters. The smaller diameter edge rim (11) engages the spreading-wedge shaft (9) and the larger diameter edge rim (12) is fixed to the housing in the area of the housing neck (7) by a spring plate (13). A return spring (21) surrounds the spreading-wedge and shaft unit. The development of cracks in the seal is avoided and the lifespan is extended in that the flexible sealing cover in the shape of a frustoconical roller bellows (10) is arranged with the smaller diameter rim (11) sealingly embracing the spreading-wedge shaft (9), and with spring plate (13) joined to the larger diameter rim (12) and serving as the support for the return spring (21).
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