Rotary vane pump having enhanced cold start priming

Pumps – With condition responsive pumped fluid control – Fluid flow rate responsive

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F04B 4902

Patent

active

051471833

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 and having 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. Kinetic energy of the stream is used to increase static pressure in the fluid supplied to the pump inlet. Porting directs hydraulic fluid, within vane slots pumped by the action of falling vanes, in the direction of rotation, across the rotor, through a terminal hole at the base of the rising vane slots, to the outlet ports. Pressure developed at the base of vanes forces the vanes radially outward into contact with the cam surface.

REFERENCES:
patent: 3589841 (1971-06-01), DeLisse
patent: 3953153 (1976-04-01), Huber et al.
patent: 4102606 (1978-07-01), Huber et al.
patent: 4222712 (1980-09-01), Huber et al.
patent: 4298316 (1981-11-01), Strikis
patent: 4386891 (1983-06-01), Riefel et al.
patent: 4420290 (1983-12-01), Drutchas
patent: 4422834 (1983-12-01), Drutchas et al.

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