Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage
Patent
1978-03-31
1980-05-20
Croyle, Carlton R.
Pumps
Condition responsive control of drive transmission or pump...
Adjustable cam or linkage
60447, 60452, F04B 4900
Patent
active
042037123
ABSTRACT:
A hydraulic control system for adjusting the displacement of a variable displacement pump or pumps as dictated by pump output pressure and input speed. Driven by the same prime mover as the pump or pumps is a charging pump which communicates with a restrictor adapted to create a differential in the output fluid pressure therefrom, which pressure differential is sensed by a sensing valve for providing a corresponding output fluid pressure. Servo control means provided to the variable displacement pump or pumps communicates with both the restrictor and the sensing valve for adjusting the pump displacement in response to the fluid pressures delivered therefrom. A flow metering valve assembly is connected in a bypass around the restrictor to permit the passage therethrough of the charging pump output fluid at a rate metered in accordance with the variable displacement pump output pressure.
REFERENCES:
patent: 3732036 (1973-05-01), Busbey et al.
patent: 3841795 (1974-10-01), Ferre et al.
patent: 3963378 (1976-06-01), McMillan
patent: 4017215 (1977-04-01), Butler
Croyle Carlton R.
Kabushiki Kaisha Komatsu Seisakusho
Look Edward
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