Pumps – With condition responsive pumped fluid control – Fluid flow rate responsive
Patent
1991-03-11
1993-03-09
Vrablik, John J.
Pumps
With condition responsive pumped fluid control
Fluid flow rate responsive
F04B 4900
Patent
active
051921960
ABSTRACT:
A power steering pump includes a housing defining an opening containing a sliding vane rotor, a cam ring and pressure plates located at each axial side of the rotor, inlet ports connected to a source of low pressure fluid, and outlet ports connected to a power steering system. The pressure control valve opens and closes an orifice of constant size connecting the pump outlet to a power steering gear. An electronically variable orifice arranged in parallel with the fixed orifice connects the pump and outlet to the power steering gear. When the control valve opens sufficiently, the pump outlet is connected to the inlet through a diffuser arranged to draw low pressure fluid into a high velocity stream of bypass fluid. An orifice fitting, located in a flow control valve that directs flow from a pump outlet port through the orifice aperture to an automotive power steering gear, diverts that flow to a bypass port connected to the pump inlet. The orifice aperture is offset radially from the axis of the valve.
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Basichas Alfred
Coppiellie Raymond L.
Ford Motor Company
May Roger L.
McKenzie Frank G.
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