PROBLEM TO BE SOLVED: To solve a problem wherein occurrence of failure that a V belt engaged and stretched around between a driven pulley fixed to an end of a grain discharge spiral shaft and a driving pulley on a driving force input side comes off both pulleys due to vibration of a machine body caused during running on a road while a tension clutch is off and vibration of the machine body caused when conveying a combine by a transportation vehicle such as a truck in a belt transmission device for the combine provided with the tension clutch for switching into a tension condition and a slack condition.SOLUTION: This belt transmission device is provided with elastically deformable belt guides 51, 61 for covering the outer periphery of the V belt 34 engaged with and stretched over the driven pulley 33 facing the direction of outer side of the machine body.COPYRIGHT: (C)2007,JPO&INPIT【課題】穀粒排出螺旋軸の軸端に固設した従動プーリと、駆動力入力側の駆動プーリとの間に係回したVベルトを、緊張状態と弛緩状態に切換えるテンションクラッチを備えたコンバインのベルト伝動装置において、テンションクラッチがオフの状態での路上走行における機体振動や、トラック等の運搬車両で当該コンバインを搬送する際の機体振動によって、両プーリからVベルトが外れてしまうといった不具合が起こることを解消する。【解決手段】機体外側方向に臨む従動プーリ33に係回したVベルト34の外周を被装する弾性変形可能なベルトガイド51,61を設けた。【選択図】図4
