Power plants – Pressure fluid source and motor – Control relative to independently driven oscillator – speed...
Patent
1985-04-29
1987-02-24
Look, Edward K.
Power plants
Pressure fluid source and motor
Control relative to independently driven oscillator, speed...
60468, 60494, F16D 3102
Patent
active
046447482
ABSTRACT:
A constant speed hydraulic drive comprising a variable displacement hydraulic pump controlled to maintain a constant flow of hydraulic fluid even though a prime mover therefor is subject to speed variations. The constant flow rate delivered by the hydraulic pump is at a rate sufficient to drive a load hydraulic motor at a predetermined speed when the load hydraulic motor is subject to any given load. A pilot operated relief valve proportionally bleeds hydraulic fluid from ahead of the hydraulic motor in accordance with the speed and load of the hydraulic motor. And an electrical means provides a varying control signal to the pilot operated relief valve which is responsive to the total pulse error between those representative of motor speed and a predetermined speed to provide a first speed command signal greater than the predetermined speed, and a second speed command signal which modifies the first speed command signal by the difference in the actual speed from the first speed command signal, whereby the speed of the hydraulic motor is maintained at the predetermined speed.
REFERENCES:
patent: 3274768 (1966-09-01), Klein
patent: 3438201 (1969-04-01), Nash et al.
patent: 3635021 (1972-01-01), McMillen et al.
patent: 4103489 (1978-08-01), Fletcher et al.
Goss, Jr. Reginald J.
Jendrzejek Gary S.
Ehrmann Thomas W.
La Fave T. Lloyd
Look Edward K.
The Oilgear Company
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