| 摘要 |
A boot-seal assembly (38) for sealing an actuation chamber (36) defined by a piston (34) being located in a bore (32) of a caliper (16) of a disc brake (10). The bore (32) has a first diameter (32a) separated from a second diameter (32b) by an annular shoulder (33), a step (37) adjacent the annular shoulder (33) and an annular groove (35) adjacent the step (37). The boot-seal assembly (38) include a square seal (50) and a boot (52), each of which surround the piston (34). The boot (52) has a molded cylindrical rubber body (54) with a metal insert (64). The metal insert (64) creates a radial outward projection (60) that extends from a first end (56) of the boot (52) and a radial inward lip (62) that extends from a second end (58) of the boot (52). The piston (34) is inserted in bore (32) and an initial force is applied to the second end (58) of the cylindrical body (54) to bring the first end (56) into contact with the seal (50) and position the seal (50) on the step (37). A further force is applied to the second end (58) of the boot (52) to move the seal (50) onto the step (37) and thereafter bring the seal (50) into engagement with the annular shoulder (33). When the seal (50) engages the annular shoulder (33), the radial outward projection (60) snaps into the annular groove (35) to lock the boot (52) onto the caliper (16).
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