Steering linkage interface between steering cylinder and ground drive pump displacement control arms
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United States of America Patent
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Sep 1, 2015
Grant Date -
May 22, 2014
app pub date -
Mar 15, 2013
filing date -
Nov 20, 2012
priority date (Note) -
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Abstract
A four-bar linkage is provided as a mechanical interface for transferring respective outputs from a speed/direction control device and a hydraulic steering cylinder to displacement control arms of a pair of pumps of a dual-path hydrostatic transmission including a pair of motors respectively coupled for driving a pair of front wheels of a vehicle. The hydraulic steering cylinder is fixed and has a piston rod slidably coupled to an input arm of the four-bar linkage in such a way that a rotation speed decrease occurs as the arm and a linked control plate are pivoted from a neutral position, the control plate transferring pivotal movement to effect differential movement of the displacement control arms. This results in the vehicle speed decreasing during a turn.
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