Patent ID: 7556479
Filing Date: 2009-07-07
Classification: F04C,Y10T

Abstract:
1. A power steering pump comprising: a housing having a bore with a longitudinal axis; a fluid discharge port extending into the bore for communicating flow of pressurized fluid into said bore; a fluid outlet located at one end of said bore for providing fluid output flow from said pump; a fluid bypass port communicating with the bore for providing a pressure relief flow path from said pump; a flow control valve slidably received in the bore for reactively diverting fluid flow from said fluid discharge port in response to differential pressures applied to opposite ends of said flow control valve, said bore further including a pressure sensing chamber located adjacent a first end of said flow control valve and said fluid outlet being located adjacent a second end of said flow control valve; said housing further including a fluid pressure passageway communicating with and extending between said fluid outlet and said pressure sensing chamber to communicate fluid under pressure between said fluid outlet and said pressure sensing chamber; said fluid outlet includes a flow control member having an outlet passageway at a first end and a cylindrical cavity extending from said outlet passageway towards a second end, wherein said flow control member is in open communication between said flow control valve and said fluid outlet; said flow control member having a first portion of a first outer diameter approximately equal to the diameter of said bore to allow said member to be fixedly secured within said bore, and a second portion of a second outer diameter adjacent said first diameter; said second outer diameter being lesser than said first outer diameter and said second portion having an aperture therein, said aperture providing communication between said cavity and said fluid pressure passageway; and said cylindrical cavity having a first portion of an inner wall with a first inner diameter and a second portion of said inner wall with a second inner diameter that is greater than said first diameter; and a filter located in said cavity between said fluid outlet and said fluid pressure passageway, spaced from said second portion of said inner wall of said cylindrical cavity to define an annular space therebetween and filtering only fluid traveling from said cavity through said aperture and into said fluid pressure passageway.