Pilot operated hydraulic device

Details Pilot operated hydraulic device Pilot operated hydraulic device

1981-04-09

1983-01-04

Croyle, Carlton R.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

417222, F04B 126, F04B 4900

Patent

active

043666728

ABSTRACT:
A fluid pressure system includes a variable displacement pump and a control spool. The control spool has one end face exposed to pressure in a control chamber and another end face exposed to pump outlet pressure to increase or decrease the displacement of the pump. The control chamber includes a pilot valve which regulates the maximum pressure in the control chamber. A resistance means and a capacitance means is connected to the control chamber in parallel with the pilot valve to make the control spool responsive to the rate of change of pump outlet pressure.

REFERENCES:
patent: 2943641 (1960-07-01), Arnold
patent: 3171352 (1965-03-01), Swift
patent: 3570245 (1971-03-01), Van Der Linde
patent: 3601504 (1971-08-01), McBurnett
patent: 3774505 (1973-11-01), McLeod
patent: 3784327 (1974-01-01), Lonnemo
patent: 3941513 (1976-03-01), Malott
patent: 3987626 (1976-10-01), Bianchetta
patent: 3995425 (1976-12-01), Wittren
patent: 4014198 (1977-03-01), Herrmann
patent: 4028890 (1977-06-01), Habiger et al.
patent: 4083375 (1978-04-01), Johnson
"Stabilizing Networks for Hydraulic Motors" by Mannetie, Control Engineering, Jun. 1974, pp. 55-58.

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