Control valve for variable displacement pump or motor

Details Control valve for variable displacement pump or motor Control valve for variable displacement pump or motor

1976-10-07

1977-09-27

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Servo-motor having externally operated control valve sets...

60488, 13762525, F16H 3946

Patent

active

040502473

ABSTRACT:
Modifying the lands of a control spool of a control valve to provide pressurized fluid to the destroking servo when the land covers the destroking servo port. The lands of a control spool are provided with notches to allow fluid to flow from the control pressure port of the control valve to the servo ports of the valve. These notches ensure that a flow of pressurized fluid will be transmitted from the control pressure port to the destroking servo port during return of the swashplate to its neutral position. By providing the notches, pressurized fluid is directed to the destroking port when the land of the control spool covers the destroking servo port. This pressurized fluid helps force via the destroking servo the swashplate back to its neutral position.

REFERENCES:
patent: 3236049 (1966-02-01), Reinke
patent: 3359727 (1967-12-01), Hann et al.
patent: 3585797 (1971-06-01), Moon

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