Control system for hydraulic fluid pressure

Details Control system for hydraulic fluid pressure Control system for hydraulic fluid pressure

1984-06-27

1987-04-21

Wolfe, Jr., Willis R.

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

Condition responsive means for modifying working member...

91531, 13759612, F15B 1307

Patent

active

046587055

ABSTRACT:
A system for controlling the pressure of hydraulic operating fluid selectively supplied from a pressurized hydraulic fluid source into an actuator or actuators for speed-change clutch-brakes of a multi-stage power shift transmission through hydraulic fluid circuits by the interposition of predetermined directional control valves selected from a plurality of directional control valves connected with the actuators, respectively, has a hydraulic fluid pressure control valve assembly including a pressure modulating valve, a modulating relief valve, and a device for raising a preset relief pressure of the modulating relief valve. The preset relief pressure raising device comprises a balance piston-cylinder assembly actuated by a pressurized pilot fluid supplied from the pressurized hydraulic fluid source.

REFERENCES:
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patent: 3962954 (1976-06-01), Jacob et al.
patent: 4096882 (1978-06-01), Yano et al.
patent: 4148248 (1979-04-01), Risk
patent: 4317466 (1982-03-01), Ikeda et al.
patent: 4321855 (1982-03-01), Bacquie et al.
patent: 4345736 (1982-08-01), Zeuner et al.
patent: 4535681 (1985-08-01), Nakamura et al.

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