PROBLEM TO BE SOLVED: To solve a problem that not only a reverse rotation drive part but also a normal rotation drive part is damaged when the reverse rotation drive part is operated by mistake during reaping work.SOLUTION: The combine comprises: a threshing device 3 connected to a reaping device 4 by a conveyance elevator 14 in an upper part of a travel device 2 a grain tank 5 in a side of the threshing device 3 a normal rotation drive part S normally driving the reaping device 4 by rotation power of an engine 21 and a reverse rotation drive part G including a reverse rotation mechanism 20 transmitting power to the reaping device 4 by reversing a rotation direction from the engine 21. A reaping input pulley 23 and a reverse rotation input pulley 36 are provided in the normal rotation drive part S and the reverse rotation drive part G respectively. A normal rotation transmission clutch 39 and a reverse rotation transmission clutch 37 are provided on transmission upstream sides of the reaping input pulley 23 and the reverse rotation input pulley 36 respectively. The reaping input pulley 23 of the normal rotation drive part S has a larger diameter than the reverse rotation input pulley 36 of the reverse rotation drive part G.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2017,JPO&INPIT【課題】刈取作業中に誤って逆転駆動部を作動させてしまうと、逆転駆動部のみならず正転駆動部をも破損させてしまうことがあるという課題がある。【解決手段】走行装置2の上方に刈取装置4と搬送エレベーター14により接続された脱穀装置3を設け、脱穀装置3の側部にグレンタンク5設け、エンジン21の回転動力によって刈取装置4を正転駆動する正転駆動部Sと前記エンジン21からの回転方向を逆転させて刈取装置4へ伝達する逆転機構20を有する逆転駆動部Gとを設け、前記正転駆動部Sと逆転駆動部Gの夫々に刈取入力プーリ23と逆転入力プーリ36を設け、前記刈取入力プーリ23と逆転入力プーリ36の伝動上手側に正転伝動クラッチ39と逆転伝動クラッチ37をそれぞれ設け、正転駆動部Sの刈取入力プーリ23を逆転駆動部Gの逆転入力プーリ36よりも大径に形成したコンバイン。【選択図】図3
