Hydraulic control system for use in a forklift truck

Details Hydraulic control system for use in a forklift truck Hydraulic control system for use in a forklift truck

1995-12-29

1997-04-08

Ryznic, John E.

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60486, F16D 3102

Patent

active

056177240

ABSTRACT:
A hydraulic control system is provided for use in a forklift truck having an engine, a steering cylinder, a lift cylinder, a tilt cylinder, a steering pump rotatably driven by the engine for producing a steering fluid under pressure to actuate the steering cylinder and a main pump for generating a working fluid under pressure to actuate the lift and tilt cylinders. The system includes a steering control valve unit for changing flow path of the steering fluid to control movement of the steering cylinder, a priority valve lying between the steering pump and the steering control valve unit for supplying the steering control valve unit with a controlled amount of the steering fluid, a main control valve unit selectively connected to the main pump and adapted to control movement of the lift and tilt cylinders and a stall valve remaining, when the engine is rotating at no greater than a preselected rpm, in a first position in which the working fluid is bypassed to the priority valve and, when the engine is rotating at greater than the preselected rpm, shifted to a second position in which the working fluid is fed to the main control valve unit.

REFERENCES:
patent: 4449365 (1984-05-01), Hancock
patent: 4635439 (1987-01-01), Wible
patent: 4819430 (1989-04-01), Becker
patent: 5413452 (1995-05-01), Lech et al.

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