PROBLEM TO BE SOLVED: To make simple improvements to a transmission structure of a combine harvester, thereby easily switching the rotation speed of a threshing cylinder between high speed for rice and wheat and low speed for soybeans without deteriorating the reaping performance and the conveying speed of a reaping and conveying device.SOLUTION: In this transmission structure of a combine harvester having a transmission means B configured to transmit power from an engine 72 to a horizontal winnower shaft 51 and from the winnower shaft 51 to the reaping and conveying device 2 and the threshing cylinder 19, the transmission means B has in parallel a reaping and conveying transmission system L2 for transmitting the power from the winnower shaft 51 to the reaping and conveying device 2 and a threshing cylinder transmission system L1 for transmitting the power to the threshing cylinder 19.COPYRIGHT: (C)2012,JPO&INPIT【課題】コンバインの伝動構造に簡単な改良を施すことにより、扱胴の回転速度を、刈取搬送装置での刈り取り性能や搬送速度の低下を招くことなく、稲麦用の高速と大豆用の低速とに簡単に切り換えられるようにする。【解決手段】エンジン72からの動力を左右向きの唐箕軸51に伝達し、唐箕軸51から刈取搬送装置2と扱胴19とに伝達するように構成した伝動手段Bを備えたコンバインの伝動構造において、伝動手段Bに、唐箕軸51からの動力を刈取搬送装置2に伝動する刈取搬送伝動系L2と扱胴19に伝動する扱胴伝動系L1とを並列に備える。【選択図】図7
