Hydraulic winch speed control with pressure-responsive override

Details Hydraulic winch speed control with pressure-responsive override Hydraulic winch speed control with pressure-responsive override

1981-10-23

1984-03-06

Ostrager, Allen M.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

60445, F16H 3946

Patent

active

044346166

ABSTRACT:
A system for varying the speed and displacement of a variable-displacement hydraulic motor and for providing a feedback signal which prevents the motor from stalling when an operator tries to reduce the motor displacement below the stall level. The system is especially useful for operating a hydraulic winch system on a wire rope crane. A variable displacement hydraulic pump provides pressurized fluid to operate a variable displacement hydraulic motor for lifting loads supported by the wire rope. The motor speed is controlled by varying the displacement of the pump and/or the motor, with the motor speed generally increasing as motor displacement decreases. The motor could stall if the crane operator decreases motor displacement below a critical value. A feedback signal coupled to the motor controls the motor displacement to prevent motor stalls.

REFERENCES:
patent: 3478513 (1969-11-01), Ma et al.
patent: 4139987 (1979-02-01), Budzich

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