| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a working vehicle which can be smoothly accelerated by preventing a drop of engine speed even if clutch switching is performed when the rotation angle of a trunnion shaft of HST (hydrostatic transmission) is changed. Ž<P>SOLUTION: The opening of the trunnion shaft and the engine speed are changed according to the operation quantity of an HST pedal, and when a low-speed hydraulic clutch is switched to a high-speed hydraulic clutch in a transmission, the opening of the trunnion shaft corresponding to an operation position of the HST pedal is changed. When the opening exceeds a predetermined ratio of maximum rotation angle, the trunnion shaft is returned to the deceleration side to the predetermined ratio in a predetermined short time, whereby the degree of drop of the engine speed is minimized to smooth the switching from the low-speed hydraulic clutch to the high-speed hydraulic clutch. Accordingly, the vehicle can be rapidly accelerated. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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