PROBLEM TO BE SOLVED: To solve the problem of a combine harvester having lowering of feeding amount of an oil from a hydraulic pump to a hydraulic motor to destabilize rotational speed of an output shaft and lower rotation torque when lowering rotational speed of a continuously variable transmission for reaping.SOLUTION: A reaping portion 4 is driven at variable speed by a continuously variable hydrostatic transmission 21 for reaping and conveying synchronized at traveling speed of a traveling device 3. At a planetary gear mechanism 70 for reaping and a carrier 72 between an out put shaft 38 of the continuously variable transmission 21 and an output pulley 45 for reaping, a planetary gear 73 is rotatably pivoted and an annular gear 77 is integrally provided, and a gear 78 attached to an input shaft 37 driven by an engine 22 is engaged with the annular gear 77. A sun gear 74 attached to the output shaft 38 of the continuously variable transmission 21 is engaged with the planetary gear 73, and the planetary gear 73 is engaged with an input gear 76 fixed to a reaping output shaft 45A provided with the output pulley 45 for reaping.COPYRIGHT: (C)2010,JPO&INPIT【課題】刈取用無段変速装置の回転数が低いと、油圧ポンプから油圧モータへの送油量が少なく、出力軸の回転数が不安定で回転トルクも低くなる。【解決手段】刈取部4は走行装置3の走行速度に同調して刈取搬送用静油圧式無段変速装置21により変速駆動させる。無段変速装置21の出力軸38と、刈取出力プーリー45との間の刈取用遊星歯車機構70、キャリア72に遊星歯車73を回転自在に軸支すると共に環状歯車77を一体に設け、環状歯車77にエンジン22から駆動される入力軸37に取付けたギヤ78を噛み合わせる。無段変速装置21の出力軸38に取付けたサンギヤ74を遊星歯車73に噛み合わせ、該遊星歯車73を前記刈取出力プーリー45を備えた刈取出力軸45Aに固定の入力歯車76に噛み合わせる。【選択図】図3
