Power steering pump

Details Power steering pump Power steering pump

1975-12-09

1977-03-29

Husar, C. J.

Pumps

With condition responsive pumped fluid control

Bypass or relief valve controls venting by movable pump...

417300, F04B 4900

Patent

active

040146308

ABSTRACT:
A pump comprises a housing having an inlet and an outlet. The housing defines a pumping chamber and pumping means is located in the chamber and is operable to pump fluid from the inlet to the outlet. The pumping means includes pumping elements which define a series of pumping pockets which expand and contract to effect pumping of fluid. A cheek plate having one axial side adjacent to and facing the pumping means is supported in the housing. The cheek plate has a sealing position blocking fluid communication between the pumping pockets and is movable therefrom to enable fluid to flow directly between the pockets. The housing defines a cavity on the other axial side of the cheek plate. A fluid passage directs a flow of fluid from the pumping means into the cavity for urging said cheek plate into sealing position. A seal is provided between the cheek plate and the housing blocking flow into the cavity. An orifice is located in the pump outlet. A valve means is provided for venting the fluid pressure in the cavity to enable the cheek plate to move away from the pumping means to bypass fluid from the pump outlet to the inlet across the cheek plate. The valve means includes a movable valve member having surfaces acted upon by fluid pressures on opposite sides of the orifice and which is movable in response to changes in the forces acting thereon to control the pressure in the cavity to control the position of the cheek plate. The valve member is stabilized by a fluid flow therepast which flow is established after initial movement of the valve member which effects venting of the cavity.

REFERENCES:
patent: 2437791 (1948-03-01), Roth et al.
patent: 2755741 (1956-07-01), Erskine
patent: 2818813 (1958-01-01), Pettibone et al.
patent: 3495539 (1970-02-01), Tomita et al.
patent: 3656870 (1972-04-01), Kusakae et al.
patent: 3671143 (1972-06-01), Clark
patent: 3679329 (1972-07-01), Drutchas et al.
patent: 3822965 (1974-07-01), Drutchas et al.
patent: 3930759 (1976-01-01), Drutchas

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