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

1976-05-21

1978-08-22

Mitchell, David M.

Motor vehicles

Power

Hoods

60491, B60K 1710

Patent

active

041082656

ABSTRACT:
A hydrostatic-transmission control system for fork-lift trucks and like industrial vehicles has a pair of variable-displacement hydrostatic motors driving respective wheels on opposite sides of the vehicle and supplied by pump means 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 pump means and motors, the control of the transmission ratio is a function only of the position of the aforementioned element whereas, for highest output speeds, the ratio is controlled at least in part independently of this element by a further parameter, e.g. prime-mover output.

REFERENCES:
patent: 2886944 (1959-05-01), Horwood
patent: 3058297 (1962-10-01), Tolley
patent: 3214911 (1965-11-01), Kempson
patent: 3243959 (1966-04-01), Fantom
patent: 3477225 (1969-11-01), Cryder et al.
patent: 3650107 (1972-03-01), Court
patent: 3986358 (1976-10-01), Hoffmann

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