Infinitely variable orifice for part throttle control

Details Infinitely variable orifice for part throttle control Infinitely variable orifice for part throttle control

1976-03-15

1977-04-12

Croyle, Carlton R.

Pumps

Condition responsive control of drive transmission or pump...

Plural pumps with individual or relative control

60423, 60428, 60447, 417326, F04B 4900, F16D 3102

Patent

active

040172155

ABSTRACT:
A hydraulic power system having a plurality of variable displacement pumps for supplying pressurized fluid for manipulation of one or more implements includes control means operative to automatically adjust pump displacement to the output horsepower of a prime mover driving the pumps of a system. The control means includes an underspeed valve responsive to a deviation in the speed of the prime mover from any one of a wide range of selected speeds to transmit a fluid pressure signal to servo control means for adjusting the displacement of the pumps in proportion to engine output. The control means includes an infinitely variable orifice adjustable with throttle movement for adjusting the underspeed valve to respond to a deviation from a wide range of selected engine speeds.

REFERENCES:
patent: 3963378 (1976-06-01), McMillan

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