| 摘要 |
PROBLEM TO BE SOLVED: To provide a turning control apparatus for a working vehicle which carries out smooth turning operation that scarcely causes shocks. SOLUTION: The turning control apparatus comprises a pair of continuous variable transmissions 11R,11L to carry out speed change operation of a pair of left and right running devices continuously and individually, a speed change operation means 30 which operates the respective transmissions 11R,11L speed-changeably, a turning command means 26 to freely command straight-forward advancing and turning and to freely command size of a turning radius during turning, and a control means 31 to actuate the speed change operation means 30 to advance straight-forwardly and carry out turning. The control means 31 regulates below regulation amount the variation amount of a speed ratio per unit time between output rotation speeds of the pair of the transmissions 11R,11L. The speed change operation means 30 is actuated to allow the speed ratio to be a final targetted speed ratio in correspondence to a size of turning radius commanded by turning command means 26. COPYRIGHT: (C)2004,JPO
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