Control for hydrostatic transmissions

Details Control for hydrostatic transmissions Control for hydrostatic transmissions

1975-11-17

1976-08-03

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

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

60464, 60465, 60487, 91420, 91459, 60403, F16H 3946

Patent

active

039721892

ABSTRACT:
A control valve for a variable displacement pump or motor. The valve includes a pair of solenoids which are independently actuatable to port relatively high pressure fluid to their respective servo motor. A shuttle valve actuated by the high pressure fluid is used to simultaneously port the fluid from the other servo motor to a low pressure fluid source. A manual valving system is also provided having a pair of balls each biased into engagement with a seat to seal a passage to one of the servo motors. Movement of either ball off of its seat allows high pressure to flow to the respective servo motor. The high pressure fluid actuates the shuttle valve to port fluid from the other servo motor to the low pressure fluid source.

REFERENCES:
patent: 2918042 (1959-12-01), Jensen et al.
patent: 3359727 (1967-12-01), Hann et al.
patent: 3901031 (1975-08-01), Knapp et al.

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