| 摘要 |
PROBLEM TO BE SOLVED: To improve operability by smoothly carrying out infinitely variable drive of a traveling machine body. SOLUTION: The subject combine harvester is constituted so as to transmit power from an engine from a hydraulic driving means for turning capable of changing over to advancing or retreating output through a pair of right and left planetary gear mechanisms to driving wheels of a pair of right and left traveling crawlers and applies differential torque required for turning through a hydraulic drive means for turning capable of adjusting output to the pair of right and left planetary gear mechanisms according to operating amount for turning a round steering wheel 47 to right and left. A controlling apparatus 103 enables setting of traveling speed by a turning position of a main change speed lever 49 and decreases the traveling speed in proportion to stepping amount of a pedal 102 for deceleration and controls so as to return to a traveling speed set by a main change speed lever 49 when stepping of the pedal 102 for deceleration is released. COPYRIGHT: (C)2006,JPO&NCIPI
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