| 摘要 |
A master cylinder (12) for use in a brake system. The master cylinder (14) has a housing (22) with a bore (20) therein connected by a radial port (28) and an axial port with a reservoir (32) and to the brake system through first (34) and second (36) outlet ports. First (42) and second (44) pistons located in the bore (20) are separated by a first resilient means (46) to define a first chamber (50) while the second piston (44) is separated from the bottom (21) of the bore (20) by a second resilient means (48) to define a second chamber (52). The first and second resilient means (46,48) each include a first spring (90) which is caged between a first retainer (94) and a second retainer (96) by a linkage member (98) and a second spring (92). The linkage member (98) has a head (126) which engages the first retainer (94) and an end (128) which engages the second retainer (96) to hold the first spring (90) between the first (94) and second (96) retainers. The first chamber (50) is connected to the radial port (28) through an axial passage (76) in the second piston (44) while the second chamber (52) is directly connected to the axial port in the housing (22) to communicate fluid between the reservoir (32) and the bore (20). The first (42) and second (44) pistons respond to an input force by initially moving within the bore (20) to compress the first springs (90,90') of the first (46) and second (48) resilient means and allow the second springs (92,92') to move heads (126,126') of the linkage members (98,98') into respective engagement with the second piston (44) to seal axial passage (76) and the axial port of the housing (22) to terminate communication between the bore and the reservoir.
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