PROBLEM TO BE SOLVED: To provide a pretreatment driving device in a combine harvester for accurately synchronizing the driving speeds of a pretreatment part and a traveling device.SOLUTION: A speed synchronizing means changes the driving speed of the pretreatment part 17 in the combine harvester for dividing the output from an engine 1 into a traveling transmission system and a pretreatment transmission system for the pretreatment part 17 including conveyance of grain culms in synchronization with the traveling speed. The speed synchronizing means includes: an actuator 39 for actuating the gear shifting operation of a pretreatment transmission 14 for driving the pretreatment part a traveling rotation sensor 36 for detecting the driving speed after the gear shifting operation of a traveling transmission 8 for driving the traveling device and a control device 38 for controlling the actuator 39 based on information of the traveling rotation sensor 36 to drive the pretreatment part 17 according to the traveling speed.COPYRIGHT: (C)2012,JPO&INPIT【課題】前処理部と走行装置との駆動速度の連動を正確に行うコンバインにおける前処理駆動装置を提供することを課題としている。【解決手段】エンジン1からの出力を走行伝動系と穀稈搬送を含む前処理部17への前処理伝動系とに分岐せしめるコンバインにおける前処理部17の駆動速度を走行速度に連動して変更せしめる速度連動手段を、前処理部駆動用の前処理変速機14を変速操作せしめるアクチュエータ39と、走行装置駆動用の走行変速機8の変速後の駆動速度を検出する走行回転センサ36と、走行速度に対応して前処理部17を駆動するように、上記走行回転センサ36の情報に基づいてアクチュエータ39を制御する制御装置38とから構成した。【選択図】図1
