Control system for hydrostatic transmission

Details Control system for hydrostatic transmission Control system for hydrostatic transmission

1977-01-14

1978-02-28

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Servo-motor having externally operated control valve sets...

60447, 60449, 60465, F16H 3946

Patent

active

040758419

ABSTRACT:
A system for controlling the operation of a reversible hydrostatic transmission including an engine-driven pump, particularly for a self-propelled utility vehicle such as a forklift truck, comprises a switchover member coupled with a setting lever of the hydrostatic pump which is biased by a pair of counteracting springs into a normal centered position. A shift lever, upon being moved from "neutral" to "forward" or "reverse", causes a displacement of the switchover member into a corresponding off-normal position by a fluidic or electromagnetic directive force generally proportional to engine speed. At a speed exceeding a certain limit in either direction, the switchover member deactivates the fluidic or electric operating circuit for the opposite direction whereby a shift from "forward" to "reverse", or vice versa, will let a change in direction take place only after the switchover member has been restored to near-normal exclusively by its biasing springs against the gradually decaying directive force previously applied. A pedal-operated linkage, coupled with the switchover member, serves for a rapid restoration of that member to normal or for fine speed control at near-zero velocities.

REFERENCES:
patent: 3572213 (1971-03-01), Lauck
patent: 3772888 (1973-11-01), Orlando
patent: 3783611 (1974-01-01), Bojas
patent: 3999387 (1976-12-01), Knopf

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