Hydraulic booster with electrically driven plunger pump

Details Hydraulic booster with electrically driven plunger pump Hydraulic booster with electrically driven plunger pump

1985-03-28

1987-04-28

Garrett, Robert E.

Power plants

Pressure fluid source and motor

Pulsator

60553, 60581, 60582, 60413, 60431, 60433, 417 38, 417 44, B60T 1312, F16D 3102, F15B 700, F04B 4900

Patent

active

046603816

ABSTRACT:
A hydraulic booster including an input piston adapted to be actuated by a manually operated member such as a brake pedal. The input piston is axially slidable in a power piston which is in turn axially slidable in a booster casing. The power piston divides the inside cavity of the casing into a power chamber and a reservoir chamber. An electrically operated plunger pump is provided and has an outlet port connected with the power chamber and an inlet port. Between the input piston and the power piston, there are defined a first valve and a second valve. The first valve functions to open the power chamber to the reservoir chamber when the pedal is released but to disconnect the power chamber from the reservoir chamber when the input piston is depressed by a first predetermined distance. The second valve functions to normally disconnect the inlet port of the plunger pump from the reservoir chamber but opens the inlet port to the reservoir chamber when the input piston is depressed by a second predetermined distance which is greater than the first predetermined distance. The arrangement is effective to decrease the load on the pump in operation of the booster.

REFERENCES:
patent: 2812639 (1957-11-01), Whitten
patent: 3048979 (1962-08-01), Grigsby et al.
patent: 3050944 (1962-08-01), Schwartz et al.
patent: 3898808 (1975-08-01), Ewald et al.
patent: 4081621 (1978-03-01), Hartley
patent: 4154326 (1979-05-01), Wolf
patent: 4398389 (1983-08-01), Horvath
patent: 4422293 (1983-12-01), Ewald
patent: 4475336 (1984-10-01), Runkle

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