Hydraulic booster with boost-pressure responsive valve

Power plants – Pressure fluid source and motor – Pulsator

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Details

60555, 60578, B60T 1538

Patent

active

047320010

ABSTRACT:
A braking pressure generator (1,21) for a vehicular hydraulic brake system, wherein a booster piston (15) which is slidable by hydraulic pressure is displaceable in the actuating direction. The booster piston (15) is arranged as a stepped piston with a smaller-diameter portion (16) close to the pedal. The booster piston (15) includes a blind-end bore remote from the pedal in which a master cylinder piston (43) is sealedly guided, wherein the smaller-diameter portion (16) of the booster piston (15) confines an annular chamber (18) diminishing upon brake application. A valve (30) is connected to the annular chamber (18) controllable by the pressure in the pressure chamber (14) of the hydraulic power booster. The valve closes a connection between the annular chamber (18) and an unpressurized supply reservoir (9). A direct connection can be established between the annular chamber (18) and the working chamber (22) by way of the valve (30) and by circumventing a sealing collar.

REFERENCES:
patent: 2458803 (1949-01-01), Stelzer
patent: 3978670 (1976-09-01), Kruse et al.
patent: 4114376 (1978-09-01), Cattaneo et al.
patent: 4242867 (1981-01-01), Belart
patent: 4483144 (1984-11-01), Steffes
patent: 4649707 (1987-03-01), Belart

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