| 摘要 |
PROBLEM TO BE SOLVED: To provide a combine harvester whose course change can easily and surely be operated with a course-changing means disposed on a rotary steering operation tool and whose spin turns can be switched in or off to prevent a misoperation. SOLUTION: The rotation output of a hydraulic continuously variable transmission (40) for turning can be adjusted by the operation of a steering operation tool (16) equipped with a motor. When the steering operation tool (16) is rotated in one of right and left directions, a wheel shaft (30) on the rotation operation direction side is decelerated to turn. When the steering operation tool (16) is further rotated in a state spin-rotated by the operation of an operation tool different from the steering operation tool (16), right and left wheel shafts (30, 30) are mutually adversely rotated to spin-turn the machine frame, and the rotation operation state of the steering operation tool (16) is displayed on a display panel (22). Furthermore, a course change means (17) capable of correcting the course direction of the machine frame in the right or left direction without needing the rotation operation of the steering operation tool (16) is disposed. COPYRIGHT: (C)2008,JPO&INPIT
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