Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1977-04-28
1978-05-09
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
60452, 60484, 60486, F15B 1309, F16H 3946
Patent
active
040879682
ABSTRACT:
The invention is concerned with an improvement in a hydraulic fluid system of a vehicle which comprises a variable displacement pump; a first work element; and a device for receiving a first load signal from the first work element and controlling the pump discharge responsive thereto. The improvement includes a plurality of second work elements which receive fluid flow from the pump via a common supply line connected to the first work element, said fluid flow not passing via any independent load responsive delivery system, and a load responsive controller having flow restricting means in a signal line which communicates with the common supply line for sensing a load pressure in the common supply line, said load pressure being a maximum load pressure of any of the second work elements and delivering a second load signal representative of the load pressure to combine with the first load signal to control the discharge of the pump to be responsive to the larger of the first and second load signals.
REFERENCES:
patent: 2892312 (1959-06-01), Allen et al.
patent: 3987626 (1976-10-01), Bianchetta
Caterpillar Tractor Co.
Geoghegan Edgar W.
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