Output speed droop compensating pump control

Details Output speed droop compensating pump control Output speed droop compensating pump control

1982-08-23

1984-11-20

Look, Edward K.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

60391, 60444, 60452, F04B 126

Patent

active

044836635

ABSTRACT:
The output speed droop compensating control is associated with a variable displacement pump connected to a motor in a fluid system. The pump has a swash plate urged in one direction by a hydraulic fluid pressure moment acting through the pistons of the pump and a servo control cylinder having a control piston connected to the swash plate. The control includes a control valve connected to the control cylinder and having a set position for maintaining a fluid pressure in the control cylinder to set the position of the swash plate for a particular pump displacement. The control valve is movable from the set position to adjust the position of the swash plate by connection of the control cylinder to either control pressure or drain. The control valve includes a valve spool which responds, when the control valve is in set position to an increase in pressure in the control cylinder responsive to the swash plate being urged in one direction by said fluid pressure moment to shift the valve spool and connect the control cylinder to control pressure and thereby modify the position of the swash plate to cancel the effect of leakage at a higher system pressure. A feedback linkage is connected between the swash plate and the valve spool and includes a spring providing a yieldable connection whereby the valve spool can shift in response to the increase of pressure in the control cylinder.

REFERENCES:
patent: 3319419 (1967-05-01), Hann
patent: 3854847 (1974-12-01), Schlecht
patent: 3941514 (1976-03-01), Louis et al.
patent: 4050247 (1977-09-01), Connett
patent: 4381702 (1983-05-01), Myers
patent: 4399886 (1983-08-01), Pollman

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