PROBLEM TO BE SOLVED: To provide a combine harvester which can simplify a reaping-driving mechanism and can easily lower a cost for making the reaping-driving mechanism.SOLUTION: Provided is the combine harvester which includes a travel machine frame having a travel portion 2 operated with an engine 14, a reaping blade device 222, a grain straw-conveying device 224, and a vehicle speed sensor for detecting the travel speed of the travel machine frame, and in which a constant rotation output from the engine is changed into a vehicle speed-synchronizing speed, and then transmitted to the reaping blade device or the grain straw-conveying device, characterized by disposing a planet gear mechanism 91 for transmitting a constant rotation output from the engine to the grain straw-conveying device and the like, and a reaping speed-changing actuator for decelerating the output of the planet gear mechanism to the grain straw-conveying device and the like, and decelerating the planet gear mechanism with the reaping speed-changing actuator on the detection result of the vehicle speed sensor.COPYRIGHT: (C)2010,JPO&INPIT【課題】刈取り駆動構造を簡単に構成できるものでありながら、刈取り駆動機構の製造コストを簡単に低減できるコンバインを提供する。【解決手段】エンジン14によって作動する走行部2を備えた走行機体と、刈刃装置222と、穀稈搬送装置224と、走行機体の移動速度を検出する車速センサとを備え、エンジンからの一定回転出力を車速同調速度に変更してから、刈刃装置又は穀稈搬送装置に伝達するコンバインにおいて、穀稈搬送装置等にエンジンからの一定回転出力を伝達する遊星ギヤ機構91と、穀稈搬送装置等に対する遊星ギヤ機構の出力を減速する刈取変速用アクチュエータとを備え、車速センサの検出結果に基づき、刈取変速用アクチュエータによって遊星ギヤ機構を減速作動する構成にした。【選択図】図5
