Hydrostatic transmission controls to simulate gear drive

Details Hydrostatic transmission controls to simulate gear drive Hydrostatic transmission controls to simulate gear drive

2008-05-20

2008-05-20

Leslie, Michael (Department: 3745)

Power plants

Pressure fluid source and motor

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

C060S368000

Reexamination Certificate

active

07373776

ABSTRACT:
A control apparatus is provided for a hydrostatic transmission to simulate a gear drive on a tractor. The hydrostatic transmission has a swashplate that is angularly movable to a plurality of positions, and a proportional valve that provides a control pressure to a servo piston to control the hydrostatic transmission swashplate position. A transmission control lever may be moved to a plurality of positions, each position providing a different voltage signal to a microcontroller. The microcontroller receives and converts a voltage signal to a coil current to actuate the proportional valve.

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