Vehicle hydraulic system with single pump

Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...

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60423, 60427, 91516, F16D 3102

Patent

active

045733198

ABSTRACT:
A hydraulic system is disclosed for energizing the power steering and various work handling hydraulic load circuits of a lift truck. A single positive displacement pump supplies the requirements of the plural load circuits and is driven by a changeable speed prime mover. Manually actuable selector means are operatively connected with the load circuits and speed control means are provided for the prime mover. A priority demand valve is connected between the pump and the respective load circuits. When only the power steering circuit is selected, the prime mover is operated in a low speed range and the priority demand valve supplies the required flow to the power steering circuit. When the lift circuit is selected, the prime mover is operated in a high speed range and the priority demand valve supplies the flow requirements to the power steering circuit and to the lift circuit. When an auxiliary work handling circuit is selected, the prime mover is operated in an intermediate speed range and the flow requirements of the power steering circuit and the auxiliary load handling circuit are supplied. The prime mover may be either an electric motor or an internal combustion engine.

REFERENCES:
patent: 3568868 (1971-03-01), Chichester
patent: 3643682 (1972-02-01), Chmura
patent: 3704800 (1972-12-01), Redelman
patent: 3875747 (1975-04-01), Briggs
patent: 3916767 (1975-11-01), Barton
patent: 3964260 (1976-06-01), Williams et al.
patent: 4005636 (1977-02-01), Dunn
patent: 4070857 (1978-01-01), Wible
patent: 4144946 (1979-03-01), Melocik
patent: 4341149 (1982-07-01), Dezelan

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