Demand responsive hydraulic pump

Details Demand responsive hydraulic pump Demand responsive hydraulic pump

1983-03-09

1984-09-11

Gluck, Richard E.

Pumps

With condition responsive pumped fluid control

Normally open bypass or relief passage closed by increased...

417310, F04B 4902, F04B 4908

Patent

active

044707665

ABSTRACT:
A hydraulic power steering system has a vane type pump which is operable to supply fluid to a steering gear at a volumetric rate determined in part by the system pressure or system demand. The pump flow is partially bypassed through a valve member disposed in the cam ring at a position adjacent the pumping chambers. The valve is spring loaded radially inward to permit the bypass flow at low system pressure levels. Increasing system pressure levels bias the valve member radially outward thereby reducing bypass flow while simultaneously increasing pump discharge flow. At a predetermined pressure level, the valve member will reach a secondary opening position to bypass fluid flow and thereby limit the maximum system pressure.

REFERENCES:
patent: 2193244 (1940-03-01), Wolcott
patent: 2362724 (1944-11-01), Shea

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