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

044707657

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 the system demand. The vane pump flow is partially bypassed through a valve member disposed in the end cover and thrust plate of the pump. The valve is rotatably disposed in the end cover and spring loaded therein to a position which permits direct fluid communication between the pumping chambers and the pump inlet. The valve member has a portion thereof operated on by system pressure which is operable to close the bypass passages with increasing system pressure such that pump discharge flow to the power steering system will increase. The valve member can be moved sufficiently in response to system pressure to reopen the bypass passages thereby providing a limiting value for maximum system pressure.

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

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