Hydraulic power booster system

Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Second path activated in response to pressure or flow in...

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91391R, F15B 1304

Patent

active

039981282

ABSTRACT:
A hydraulic power booster system having a power piston which may be adapted to be connected with an input member of a brake master cylinder and which is actuated when hydraulic pressure fluid is introduced into a power pressure chamber defined at one side of the power piston. An orifice is disposed between a hydraulic pressure source and hydraulic pressure reservoir with an opening that is restrictable for establishing a hydraulic pressure drop thereacross when a brake pedal is actuated. A control valve introduces the hydraulic pressure fluid from the pressure source to the power pressure chamber in response to a pilot hydraulic pressure established in a pilot chamber defined by the control valve upstream of the orifice. The flow of controlled hydraulic fluid through the pilot chamber becomes restricted for establishing the pilot hydraulic pressure therein when the brake pedal is actuated for restricting the opening of the orifice and thus establishing a hydraulic pressure drop thereacross.

REFERENCES:
patent: 2945352 (1960-07-01), Stelzer
patent: 3253409 (1966-05-01), Kellogg et al.
patent: 3603209 (1971-09-01), MacDuff et al.
patent: 3633363 (1972-01-01), Larsen
patent: 3688498 (1972-09-01), Bach et al.
patent: 3841095 (1974-10-01), Baker
patent: 3898809 (1975-08-01), Baker

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