| 摘要 |
A brake assembly (10) having a master cylinder (12) attached to the front shell (14) of a power assist apparatus (16). The front shell (14) is connected to a rear shell (20) which in turn is fixed to a stationary member (22). The front shell (14) has a conical section (70) that extends toward and partially surrounds the master cylinder (12). A movable wall (82) located between the front (14) and rear shell (20), which is substantially concentric to the front shell (14), divides the interior thereof into a front chamber (96) and a rear chamber (97). The movable wall (82) is connected to operational pistons (32, 34) within the master cylinder (12). An annular projection (98) extends through an opening (142) in the rear shell (20). A cylindrical member (154) located in the opening (142) extends into the rear chamber (97). A return spring (92) urges the movable wall (82) toward the cylindrical member (154). The position of the cylindrical member (154) is adjustable to align the pistons (32, 34) in the master cylinder (12) and thereby permit fluid communication from a reservoir (38) to the master cylinder (12) through compensator ports (40, 42). A bearing member (150) which surrounds the annular projection (98) has a resilient portion (148) that engages the annular portion (98) to seal the chamber (97) from the surrounding environment. In response to an input signal, a pressure differential is created across the movable wall (82). This pressure differential produces an output force which moves the pistons (32, 34) past the compensator ports (40, 42) to develop an operational fluid pressure for effecting a brake application. The conical section (70) of the first shell (14) reacts to reduce any axial deflection that may be created by the output force. |
