Fluid pumping apparatus with load limiting control

Details Fluid pumping apparatus with load limiting control Fluid pumping apparatus with load limiting control

1991-02-25

1992-06-23

Bertsch, Richard A.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

417218, 91505, F04B 126

Patent

active

051238152

ABSTRACT:
A fluid power pumping apparatus having a control system for limiting the power loading thereon to the power available from a motor (126) driving the apparatus, includes a variable displacement rotating piston pump (122). A compensating valve assembly (128) of a type known in the prior art is mounting on the pump. The compensating valve controls flow volume through the pump in response to pressure at an outlet (130) of the compensating valve. The outlet is connected to a variable pressure relief valve (134). The relief pressure of the relief valve varies according to the position of a cam (140) which is connected to the swash plate of the pump. The relief pressure of the variable pressure relief valve and the control pressure on the compensating valve are both at their maximums when the pump is at a minimum flow condition and vice versa. The variable pressure relief valve provides mechanical feedback in the control of the pump which reduces flow in response to increased pressure loading and prevents such loading from exceeding the power capability of the motor. The control system also provides for the pumping apparatus to increase flow at reduced pressures.

REFERENCES:
patent: 3612724 (1971-10-01), Smith
patent: 3700356 (1972-10-01), Kubik
patent: 3806280 (1974-04-01), Bobier
patent: 4013380 (1977-03-01), Pensa
patent: 4072442 (1978-02-01), Horiuchi
patent: 4097196 (1978-06-01), Mabiger
patent: 4355510 (1982-10-01), Ruseff
patent: 4381647 (1983-05-01), Ruseff
patent: 4617797 (1986-10-01), Williams
patent: 4715788 (1987-12-01), Kouns

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