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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

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.

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A system for priming a rotary, sliding vane, hydraulic pump comprising: a rotor having radially directed vane slots spaced angularly about the axis of the rotor; a first pressure plate located at a first axial side of the rotor, having an inlet port and an outlet port spaced mutually around the roto

A system for priming a rotary, sliding vane, hydraulic pump comprising: a rotor having radially directed vane slots spaced angularly about the axis of the rotor; a first pressure plate located at a first axial side of the rotor, having an inlet port and an outlet port spaced mutually around the rotor axis; a second pressure plate located at a second axial side of the rotor, having inlet and outlet ports spaced mutually around the rotor axis and aligned with corresponding ports of the first pressure plate; a cam surrounding the rotor, having a first arcuate surface aligned with the inlet ports and a second arcuate surface aligned with the outlet ports, first passage means formed in the first pressure plate and extending angularly from the outlet port to the inlet port, for communicating with the vane slots; second passage means formed in the second pressure plate, aligned with the vane slots and the first passage means, having a first blind passage extending angularly along at least a portion of the outlet port of the second pressure plate and a second passage extending angularly along at least a portion of the inlet port of the second pressure plate; and third passage means formed in the second pressure plate, aligned with the vane slots and the first passage means, extending angularly along at least a portion of the outlet port of the second pressure plate and a second passage extending angularly along at least a portion of the inlet port of the second pressure plate.