PROBLEM TO BE SOLVED: To provide a step type speed changer for a threshing feed chain, which has a simple structure and can be executed at an inexpensive price.SOLUTION: A high-speed side speed change belt (22) and a low-speed side speed change belt (23), which can change the speeds at high-speed and low-speed stage, are wound between a power transmission shaft to a threshing part (4) and a drive shaft (14) for driving a threshing feed chain (13), and tension clutches (24 and 25) mounted on those high- and low-speed side speed change belts (22, 23) are applied or not in accordance with the vehicle speed, so that the threshing feed chain can be speed-changed at the high and low stages.COPYRIGHT: (C)2016,JPO&INPIT【課題】本発明の課題は、構造簡単で安価に実施できる脱穀フィードチエンの有段式変速装置を提供する。【解決手段】 本発明は、脱穀部(4)への動力伝達軸と脱穀フィードチエン(13)を駆動する駆動軸(14)との間に、高低2段階の変速が可能な高速側変速ベルト(22)と低速側変速ベルト(23)を巻回して設け、これら高低側変速ベルト(22,23)に設けたテンションクラッチ(24,25)を車速に応じて入り切りして、脱穀フィードチエンを高低2段階に変速可能に構成する。【選択図】 図2
