Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage
Patent
1983-04-22
1985-06-11
Look, Edward K.
Pumps
Condition responsive control of drive transmission or pump...
Adjustable cam or linkage
60443, 60452, 417218, F04B 4900
Patent
active
045225656
ABSTRACT:
A variable displacement rotary piston pump has a rotor splined to a driven shaft, a plurality of radially directed cylinders, each having a slidable piston fitted therein, a pumping ring surrounding the rotor and mounted eccentrically of the axis of the rotor with which the pistons maintain contact and are caused to move within the cylinders, a piston return ring engageable with notches formed on the pistons and an eccentric mounted for rotation to which the pumping ring is secured having an actuator pin whose movement determines the position of the pumping ring with respect to the rotor, thereby regulating the flow rate of the pump. The pump destrokes above the idle speed of the engine from which it is driven and limits the flow rate of the pump. A venturi orifice establishes a differential pressure which is applied across a flow control valve, which directs hydraulic fluid at discharge pressure to one or the other of two control pistons thereby adjusting the eccentric position. A left-right turn valve adapts the pump for use in a power steering system in a motor vehicle. A cam follower compresses fluid which is metered to the flow control valve and directs hydraulic fluid at discharge pressure to the left and right ends of a power steering cylinder.
REFERENCES:
patent: 1987781 (1935-01-01), Maw
patent: 2552604 (1951-05-01), Thoma
patent: 3114424 (1963-12-01), Voreaux et al.
patent: 3259074 (1966-07-01), Erdmann
patent: 3333415 (1967-08-01), Adams
patent: 3583154 (1971-06-01), Utter
patent: 3742982 (1973-07-01), Miller
patent: 3991846 (1976-11-01), Chichester et al.
patent: 4079805 (1978-03-01), Rau
Ford Motor Company
Harrington Donald J.
Look Edward K.
McKenzie Frank G.
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