| 摘要 |
PROBLEM TO BE SOLVED: To perform proper automatic direction control along a cereal stalk by an automatic steering mode and perform proper coping and smooth reaping traveling even when an emergency situation occurs. SOLUTION: Side clutches on both sides to connect and disconnect power to and from a running device are provided, and through the drive of a differential transmission mechanism, which is provided between side clutch gears mount to right and left side clutch shafts, by a HST6 for turning, a running device effects reciprocally continuously variable speed change of an axle at the inside of turning through the drive of the differential transmission mechanism by the HST6 for turning. A manual steering mode to control the drive rotation speed of the HST6 for turning based on the turn operation variable of a power steering lever 3 and an automatic steering mode to control the drive rotation speed of the HST6 for turning based on the turning angle of a visual body turning through a contact with a raised cereal stalk and the vehicle speed. The manual steering mode is prior to an automatic steering mode.
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