Vehicle hydraulic system with pump speed control

Details Vehicle hydraulic system with pump speed control Vehicle hydraulic system with pump speed control

1981-08-10

1984-12-04

Cohen, Irwin C.

Power plants

Pressure fluid source and motor

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

60423, 60431, 91516, F15B 1116, F15B 1306

Patent

active

044856237

ABSTRACT:
A lift truck is disclosed with a changeable speed electric motor for driving a single positive displacement pump to supply the power steering and various work handling hydraulic load circuits. Manually actuable selector means are operatively connected with the load circuits and a speed range control means is operatively connected with the selector means for energizing the electric motor in different speed ranges according to the actuation of the selector means. A priority demand valve is connected between the pump and the respective load circuits and supplies fluid to the load circuits, giving priority to the power steering circuit. The speed range control means includes speed regulating means for the electric motor. The motor is energized from the battery and the regulating means includes a pulsing circuit with a motor current feedback to vary the mark/space ratio of the pulses produced by the pulsing circuit.

REFERENCES:
patent: 2737196 (1956-03-01), Eames
patent: 3568868 (1971-03-01), Chichester
patent: 3875747 (1975-04-01), Briggs
patent: 3964260 (1976-06-01), Williams et al.
patent: 4070857 (1978-01-01), Wible
patent: 4119898 (1978-10-01), Morton et al.
patent: 4144946 (1979-03-01), Melocik

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