PROBLEM TO BE SOLVED: To smoothly perform reaping of grain stalks during advancing into a field by shift control of a hydrostatic continuously variable transmission for traveling and reaping.SOLUTION: A neutral region (T) of a prescribed width is set at an intermediate position of a shift operating region of a shift lever (70). When the shift operating position of the shift lever (70) detected with an operating position detector (71) is out of the neutral region (T), a first hydrostatic continuously variable transmission (20) for driving a traveling device is automatically subjected to the shift operation according to the shift operating position of the shift lever (70), and a second hydrostatic continuously variable transmission (21) for driving a reaping and transporting device is synchronized with the traveling speed detected with a traveling speed detector (73), and automatically subjected to the shift operation. When a traveling state is detected with the traveling speed detector (73) irrespective of the shift lever (70) operated in the neutral region (T), the output of the second hydrostatic continuously variable transmission (21) is automatically started.COPYRIGHT: (C)2012,JPO&INPIT【課題】走行用および刈取用の静油圧式無段変速装置の変速制御によって、圃場への進入時における穀稈の刈取を円滑に行えるものとする。【解決手段】変速レバー(70)の変速操作域の中間位置に所定幅の中立域(T)を設定し、操作位置検出装置(71)で検出される変速レバー(70)の変速操作位置が中立域(T)から外れた場合に、該変速レバー(70)の変速操作位置に応じて走行装置駆動用の第1静油圧式無段変速装置(20)を自動的に変速作動させ、走行速度検出装置(73)で検出される走行速度に同調させて刈取搬送装置駆動用の第2静油圧式無段変速装置(21)を自動的に変速作動させ、変速レバー(70)が中立域(T)内に操作されているにも拘わらず、走行速度検出装置(73)によって走行状態が検出された場合に、第2静油圧式無段変速装置(21)の出力を自動的に開始させる。【選択図】 図9
