Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1995-09-27
1996-07-23
Nguyen, Hoang
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
F15B 910
Patent
active
055379109
ABSTRACT:
An actuator which causes an input shaft to move forward is disposed within the inner periphery of a valve body at its rear end. When a brake booster is inoperative, an atmospheric pressure is introduced into a pressure chamber of the actuator, but when a flow path switching valve is operated to introduce a negative pressure into the pressure chamber as required, a pressure differential is developed across a piston of the actuator, thus driving the piston forward. This allows the input shaft to be driven forward, whereby the brake booster can be operated without depressing a brake pedal. Since the atmosphere is introduced into the pressure chamber of the actuator when the brake booster is inoperative, a fracture or disengagement of a conduit which is connected to the pressure chamber cannot develop a pressure differential across the piston of the actuator, thus preventing the actuator from operating. Accordingly, a malfunctioning of the brake booster as a result of a fracture of the conduit or the like can be reliably prevented.
REFERENCES:
patent: 3452644 (1969-07-01), Julow
patent: 4535591 (1985-08-01), Kobayashi
patent: 4864915 (1989-09-01), Johnston et al.
patent: 5005465 (1991-04-01), Boehm et al.
patent: 5079991 (1992-01-01), Cadeddu
patent: 5228377 (1993-07-01), Watanabe
Jidosha Kiki Co. Ltd.
Nguyen Hoang
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