| 摘要 |
PROBLEM TO BE SOLVED: To provide a traveling device for a working vehicle capable of easily performing smooth speed-increase operation or speed-reduction operation by a main shift operation unit and a sub-shift operation unit, and capable of preventing a traveling machine body from being stopped and being reversely advanced on a slope or the like. SOLUTION: The traveling device for the working vehicle is provided with a continuously variable transmission 25 for shifting the power from an engine 5; the main shift operation unit 36 for changing a shift ratio of the continuously variable transmission 25; a sub-shift mechanism 59 for multi-stage shift transmitting shift drive output from the continuously variable transmission 25; and the sub-shift operation unit 42 for changing a shift ratio of the sub-shift mechanism 59 on the traveling machine body. The traveling device is provided with a main shift sensor 83 for detecting an operation position of the main shift operation unit 36; a shift output part rotation sensor for detecting the shift drive output revolution number of the continuously variable transmission 25; and a sub-shift sensor 84 for detecting an operation position of the sub-shift operation unit 42. The lowest main shift output from the continuously variable transmission 25 is changed by operation of the sub-shift operation unit 42. COPYRIGHT: (C)2008,JPO&INPIT
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