Dual-speed setting underspeed system

Details Dual-speed setting underspeed system Dual-speed setting underspeed system

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

60428, 60447, F04B 4900, F16D 3102

Patent

active

040172180

ABSTRACT:
A hydraulic power system having a plurality of variable displacement pumps for supplying pressurized fluid for manipulation of an implement includes a control system operative to automatically adjust pump displacement to the output horsepower of a prime mover driving the pumps of the system. The control system includes underspeed valve means responsive to a deviation in the speed of the prime mover from a predetermined normal speed and a selectable second speed to transmit a fluid pressure signal to a servocontrol means for adjusting the displacement of the pumps. The control system includes a valve for selectively conditioning the control system to cause the underspeed valve to respond to a deviation of the selected engine speed and an indicator for indicating the conditioning of the control system.

REFERENCES:
patent: 3672166 (1972-06-01), Isaac
patent: 3732036 (1973-05-01), Busbey et al.
patent: 3841795 (1974-10-01), Ferre et al.
patent: 3884039 (1975-05-01), Pourian
patent: 3963378 (1976-06-01), McMillian

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