Demand responsive hydraulic pump

Details Demand responsive hydraulic pump Demand responsive hydraulic pump

1983-03-09

1984-10-30

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

044797648

ABSTRACT:
A hydraulic power steering system has a vane type pump which is operable to supply fluid to a power steering gear at a volumetric rate determined in part by the system pressure requirement or system demand. The pump flow is partially bypassed through an aperture in the cam ring at low system pressures. The bypass flow is controlled by a sleeve valve surrounding the cam ring and being subjected to system pressure to incrementally close the aperture and reduce bypass flow and simultaneously increase the output flow. At a predetermined system pressure, the valve is moved sufficiently to control reopening of the aperture for controlled bypass flow to limit the maximum system pressure.

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

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