Hydrostatic-transmission control system, especially for lift and

Details Hydrostatic-transmission control system, especially for lift and Hydrostatic-transmission control system, especially for lift and

1977-12-23

1980-12-02

Mitchell, David M.

Motor vehicles

Power

Including traction motor of kind driven by noncompressible...

60450, 60492, B60K 1710

Patent

active

042365961

ABSTRACT:
A hydrostatic-transmission control system for fork-lift trucks and like industrial vehicles has at least one variable-displacement hydrostatic motor driving wheels on opposite sides of the vehicle and supplied by a pump having a control element for varying its displacement under the control of an operator. The prime mover, e.g. a gasoline engine or electric motor, drives the pump. The control system comprises means whereby, for low and average output speeds of the transmission consisting of a combination of the pump and motor, the control of the transmission ratio is a function only of the operator-set position of the aforementioned element whereas, for the highest output speeds, the ratio is controlled by both the position of this element and by a further parameter, usually the output speed of the prime mover.

REFERENCES:
patent: 2886944 (1959-05-01), Horwood
patent: 3054263 (1962-09-01), Budzick et al.
patent: 3058297 (1962-10-01), Tolley
patent: 3153900 (1964-10-01), Pigeroulet et al.
patent: 3477225 (1969-11-01), Cryder et al.
patent: 3561212 (1971-02-01), Pinkerton et al.
patent: 3650107 (1972-03-01), Court
patent: 3881317 (1975-05-01), Swoager
patent: 3986357 (1976-10-01), Hoffmann
patent: 4108265 (1978-08-01), Abels

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