| 摘要 |
The casing (10) of a servo-brake has a casing collar (30) from which a tubular extension (80) projects axially towards the outside. Inside the casing (10) and its tubular extension (80) are arranged in an axially movable manner in relation to one another two control units (40, 50), each comprising a valve seat (42, 52) and connected to the mobile partition wall (12) and to a force delivery unit (54) or actuating unit (64). A valve closure unit (70) is pressed by means of at least one spring (72) against the actuating unit (64) and, depending on the position of the valve seats (42, 52), is located against one or other of the seats, or against both, which enables regulation of the pressures in the two chambers (14, 16). A stop (68) on the actuating unit (64) is kept, when the force amplifier is at rest, by the spring (72) against a stop (90) on the end of the tubular extension (80) at a distance from the casing (10). The tubular extension (80) is surrounded by the collar of the casing (30); from an end position which it assumes when at rest it can be inserted in a telescopic manner into the casing (10) and is made leakproof against the collar of the casing (30). |
