Hydraulic power booster

Details Hydraulic power booster Hydraulic power booster

1988-06-29

1989-12-05

Garrett, Robert E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

91376R, 91382, 605471, F15B 910

Patent

active

048844926

ABSTRACT:
A hydraulic booster includes a power piston which is inserted slidably into a cylinder member and has a tip portion which is coupled to a piston of a master cylinder, a pressure chamber disposed in the rear of the power piston, a return valve provided in such a manner as to open and close a channel for connecting the pressure chamber to a reservoir, and a supply valve disposed in such a manner as to connect the pressure chamber to a high-pressure fluid source, a high-pressure fluid being introduced into the pressure chamber as the return valve is closed and the supply valve is opened. A valve sleeve is slidably inserted in the power piston and is urged rearwardly of the power piston by a spring, and a cam portion provided in the valve sleeve is employed to open and close the supply valve.

REFERENCES:
patent: 2928378 (1960-03-01), Leduc
patent: 3628423 (1971-12-01), Dymond
patent: 3707112 (1972-12-01), Ewald
patent: 3707880 (1973-01-01), Bach
patent: 3747473 (1973-07-01), Bach et al.
patent: 3815364 (1974-06-01), Belart et al.
patent: 4642990 (1987-02-01), Mizusawa et al.

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