Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Patent
1990-05-29
1991-10-29
Kwon, John T.
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
91461, F15B 1108
Patent
active
050604759
ABSTRACT:
Pilot control circuits are useful, for example, for controlling the actuation of main control valves of load sensing hydraulic systems. Using the main supply pump as the source of pressurized pilot fluid sometimes results in inadequate pilot pressure for maintaining the main control valves in an actuated position under some operating conditions. The subject pilot control system includes an accumulator to store pressurized fluid received from the main supply pump for use by the pilot control circuit when the pressure level of the main hydraulic system momentarily drops below a level for proper pilot control operation. Thus, the main control valves are maintained in their actuated position irregardless of the pressure level of the fluid in the main supply system.
REFERENCES:
patent: 2392471 (1946-01-01), Fox
patent: 4204461 (1980-05-01), Gratzmuller
patent: 4362089 (1982-12-01), Melocik et al.
patent: 4381904 (1983-05-01), Kyte et al.
patent: 4635440 (1987-01-01), Kropp
patent: 4813235 (1989-03-01), Miller
patent: 4850191 (1989-07-01), Kreth et al.
patent: 4976106 (1990-12-01), Noerskau et al.
Caterpillar Inc.
Grant John W.
Kapsalas George
Kwon John T.
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