PROBLEM TO BE SOLVED: To enable to change the rotation speed of a thresher without requiring labor.SOLUTION: In a transmission structure of a combine harvester equipped with a transmission means for transmitting the power from an engine to plural driven equipments D, the transmitting means is configured to include an input side pulley 86A receiving the power from the engine and an output side pulley 86B transmitting the power to a thresher 3 among the plural driven equipments D, and on at least one of the input side pulley 86A and the output side pulley 86B, a belt winding part 121a of a large diameter pulley 121 and a belt winding part 120a of a small diameter pulley 120 are set in the same plane and on the same rotation axis, and the large diameter pulley 121 is composed to be freely attachable and detachable.COPYRIGHT: (C)2013,JPO&INPIT【課題】手間を掛けずに脱穀装置の回転速度の変更を行えるようにする。【解決手段】エンジンからの動力を複数の被駆動機器Dに伝達する伝動手段を備えたコンバインの伝動構造において、伝動手段は、エンジンからの動力を受ける入力側プーリ86Aと、複数の被駆動機器Dのうちの脱穀装置3に動力を伝達する出力側プーリ86Bとを備えて構成され、入力側プーリ86Aと出力側プーリ86Bとの少なくとも何れか一方に、大径プーリ121のベルト巻回部121aと小径プーリ120のベルト巻回部120aとを同一面内に且つ同一回転軸心上に配置し、大径プーリ121を着脱自在に構成してある。【選択図】図5
