Fluid operated booster

Power plants – Pressure fluid source and motor – Pulsator

Patent

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Details

91416, B60T 1300

Patent

active

051860023

ABSTRACT:
A fluid operated booster comprising a first valve for controlling the communication between an accumulator and a hydraulic pressure chamber, and a second valve for controlling the communication between the hydraulic pressure chamber and a reservoir, in which, a brake pedal rod is operated to close the second valve and to open the first valve, so that a hydraulic pressure is applied from the accumulator to the hydraulic pressure chamber to act on a power piston, to cause the power piston to provide an operating force, which is transmitted to a master cylinder piston to provide a boosted hydraulic pressure for a brake system; in which, according to the invention, the first valve is a spool valve which is mounted on the brake pedal rod with a predetermined frictional force in such a manner that the spool valve is movable a predetermined distance, and the first valve is closed when the brake system is not in operation, so that no hydraulic pressure from the accumulator is applied to the sliding portion of the brake pedal rod.

REFERENCES:
patent: 4283994 (1981-08-01), Belart
patent: 4404803 (1983-09-01), Steffes
patent: 4433543 (1984-02-01), Thomas et al.
patent: 4435960 (1984-03-01), Farr
patent: 4976105 (1990-12-01), Horiuchi et al.
European Search Report dated May 12, 1992.

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