Vane type pump with a variable capacity for power steering devic

Details Vane type pump with a variable capacity for power steering devic Vane type pump with a variable capacity for power steering devic

1982-12-22

1985-01-29

Look, Edward K.

Pumps

Condition responsive control of drive transmission or pump...

Having condition responsive pumped fluid control

417220, 417310, 418 30, 418 31, F04B 4900

Patent

active

044962886

ABSTRACT:
A vane type pump with a variable capacity for power steering devices is provided with a movable ring received and radially movable in a closed cylindrical bore of a pump housing. A spring acts on the movable ring to deflect the axis of the movable ring from the axis of a rotor, which is rotated to move vanes along an internal bore of the movable ring. A sealing pin and a valve element are provided at diametrically opposite sides of the movable ring and define first and second pressure chambers around the movable ring. The first pressure chamber receives pressurized fluid from a part of the internal bore of the movable ring and conducts the pressurized fluid into the second pressure chamber through a throttle, which is defined by the valve element and a part of a circumferential external surface of the movable ring. The throttle generates a pressure difference between the first and second pressure chambers, and the pressure difference acts on the movable ring to move the same against the force of the spring. The pump is further provided with a solenoid operated actuator for adjusting the position of the valve element, and a relief valve.

REFERENCES:
patent: 2635551 (1953-04-01), De Lancey
patent: 2985109 (1961-05-01), Ernst
patent: 3743445 (1973-07-01), Dworak et al.
Japanese Published Unexamined Patent Application No. 56-143384, Filed: Apr. 10, 1980, Published: Nov. 9, 1981.
Japanese Published Unexamined Utility Model Application No. 54-123539, Filed: Feb. 20, 1978, Published: Aug. 29, 1979.

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