PROBLEM TO BE SOLVED: To enhance working efficiency of a combine harvester by improving operability of a steering tool.SOLUTION: The combine harvester is provided with differential mechanisms mounted in transmission case 32L, 32R for driving crawlers. A hydraulic continuously variable transmission mechanism 5 for traveling and a hydraulic continuously variable transmission mechanism 6 for turning are each installed on the transmission case 32L, 32R, setting an axis 18 inside of turning to perform continuously variable transmission in normal and reverse directions by driving of the differential mechanism by the hydraulic continuously variable transmission mechanism 5 for traveling and the hydraulic continuously variable transmission mechanism 6 for turning, setting the turning rate of the hydraulic continuously variable transmission mechanism 6 for turning adjusted according to the turning angles of the steering tool, setting the tilting posture in longitudinal direction of the steering tool as adjustable and installing a switch for lifting up/down of a reaping part on the grip of the steering tool.COPYRIGHT: (C)2009,JPO&INPIT【課題】操向操作具の操作性の向上によってコンバインの作業能率を高める。【解決手段】クローラを駆動するミッションケース32L,32R内に差動機構を設け、該ミッションケース32L,32Rに走行用油圧無段変速機構5と旋回用油圧無段変速機構6を取り付け、該走行用油圧無段変速機構5と旋回用油圧無段変速機構6による差動機構の駆動によって旋回内側の車軸18を正逆に無段変速して駆動する構成とし、前記旋回用油圧無段変速機構6の駆動回転速度を操向操作具の回動操作角度に応じて調節する構成とし、該操向操作具の前後方向の傾斜姿勢を調節可能に構成し、該操向操作具の掴み部に刈取部を昇降操作するスイッチを設ける。【選択図】図10
