Power plants – Pressure fluid source and motor – Condition responsive control of or by input to input pump...
Patent
1976-10-15
1977-08-16
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Condition responsive control of or by input to input pump...
60444, 60445, F16H 3946
Patent
active
040417026
ABSTRACT:
A fluid drive vehicle has an engine speed control, a fluid drive transmission having a fluid actuator device for moving a control element from its neutral position progressively to increase the drive ratio, and a control system which includes a first fluid circuit which has a control valve movable from a neutral fluid blocking position progressively to increase the flow of pressurized fluid from an auxiliary pump to the fluid actuator device. A fluid responsive servo mechanism moves the control valve from the neutral position while a fluid motor is operative to move the engine speed control from an idling position to increase the engine speed. A second fluid circuit includes a pressure control valve manually actuatable from a neutral fluid flow blocking position to an actuated position for providing fluid flow therethrough from the auxiliary pump to the servo mechanism and the fluid motor and for regulating and maintaining the pressure of the fluid delivered to the servo mechanism and the fluid motor at a pressure level commensurate with the actuated position, and an inching valve selectively manually actuatable from an open position which permits substantially unrestricted fluid flow to the servo mechanism to an actuated position restricting fluid flow to the servo mechanism for reducing the pressure of the fluid delivered to the servo mechanism while maintaining the pressure of the fluid directed to the fluid motor at the pressure level determined by the pressure control valve.
REFERENCES:
patent: 3685290 (1972-08-01), Krusche
patent: 3898807 (1975-08-01), Habiger
patent: 3952512 (1976-04-01), Feller
Caterpillar Tractor Co.
Geoghegan Edgar W.
Grant John W.
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