F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
103/46
F04B 1/26 (2006.01) F04B 1/32 (2006.01)
Patent
CA 1208075
OUTPUT SPEED DROOP COMPENSATING PUMP CONTROL Abstract The output speed droop compensating control is associated with a variable displacement pump con- nected 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 con- trol 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.
433896
Riches Mckenzie & Herbert Llp
Sundstrand Corporation
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