Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1988-10-06
1990-03-06
Garrett, Robert E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91372, 91376R, 91373, F15B 910
Patent
active
049055704
ABSTRACT:
There is described a power booster for actuating a master brake cylinder having a booster piston which is axially movable in a cylinder bore and which, with its peripheral surface, confines a pressure chamber connectible to a hydraulic pressure source and, with an end surface, confines a booster chamber that is connectible with a pressure chamber via a first closable valve passage. Via a second closable valve passage, the booster chamber is connectible with a compensating chamber connected to an unpressurized reservoir. The compensating chamber is bounded by the peripheral surface of a reaction piston and by a sleeve that is formed fast with the housing and encompasses the reaction piston. The second valve passage is disposed in a central bore in the reaction piston terminating into the booster chamber. Arranged in the central bore is an actuating rod which carries a valve element for closing the second valve passage and which extends into the first valve passage in the booster piston. In the event of the reaction piston approaching the booster piston, the actuating rod opens the first valve passage after closing the second valve passage.
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Reinartz Hans-Dieter
Steffes Helmut
Alfred Teves GmbH
Denion Thomas
Garrett Robert E.
Seitter Robert P.
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