Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1986-10-30
1988-06-14
Chambers, A. Michael
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91 32, 605471, F15B 910
Patent
active
047504064
ABSTRACT:
A hydraulic power booster, in particular for the actuation of a master cylinder in a brake system of an automotive vehicle is disclosed including a pressure fluid source, a valve assembly by means of which the pressure fluid is adapted to be introduced into a booster chamber in dependence upon an actuating force. An axially slidable stepped booster piston confines the booster chamber and is provided with two piston parts of different diameters which are movable axially relative to one another by a predetermined amount. To enable instantaneous pressure build-up in the working chambers of the master cylinder upon commencement of braking, an intermediate piston part is coupled to the primary piston of the master cylinder and is caused to move ahead of the actual booster piston part. Movement of the auxiliary piston part is achieved by passing the pressure fluid from the booster chamber through a channel in the booster piston part to an intermediate chamber wherein the fluid acts on the effective area of the auxiliary piston part. Discharge of the fluid through the channel is damped by a throttle and a nose portion of the auxiliary piston is slidably received in a blind bore in the booster piston providing damped auxiliary piston movement.
REFERENCES:
patent: 3253409 (1966-05-01), Kellogg et al.
patent: 3625113 (1971-12-01), Suler
patent: 4362086 (1982-12-01), Runkle
Alfred Teves GmbH
Chambers A. Michael
Raden James B.
Seitter Robert P.
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