PROBLEM TO BE SOLVED: To improve efficiency of threshing work by smoothly transferring reaped grain culms from a reaping/conveying device to a feed chain.SOLUTION: The combine harvester comprises: a threshing device (3) including a traveling device (2), at a lower par of a machine body frame (1) equipped with an engine (62), driven by a first hydraulic type continuously variable transmission (66) and a feed chain (12B), at an upper part of the machine frame (1), driven by a second hydraulic type continuously variable transmission (10) a reaping/conveying device (4) in front of the machine frame (1), driven at a speed synchronized with a driving speed of the traveling device (2), reaping grain culms in the farm field, and transferring them to the feed chain (12B) and a control device (85) controlling the second hydraulic type continuously variable transmission (10) to change gear so as to retain a conveying speed of the feed chain (12B) at a substantially same speed as the conveying speed of the reaping/conveying device (4) in a variable speed range excluding a part of variable speed range of the driving speed of the traveling device (2).COPYRIGHT: (C)2014,JPO&INPIT【課題】刈取搬送装置からフィードチェンへの刈取穀稈の引き継ぎを円滑化して脱穀作業の能率を高める。【解決手段】エンジン(62)を搭載した機体フレーム(1)の下部に、第1油圧式無段変速装置(66)で駆動される走行装置(2)を設け、機体フレーム(1)の上部には、第2油圧式無段変速装置(10)で駆動されるフィードチェン(12B)を備えた脱穀装置(3)を設け、機体フレーム(1)の前側には、走行装置(2)の駆動速度に同調した速度で駆動され、圃場の穀稈を刈り取ってフィードチェン(12B)へ引き継ぐ刈取搬送装置(4)を設け、走行装置(2)の駆動速度の変速域のうちの一部を除く変速域においてフィードチェン(12B)の搬送速度を刈取搬送装置(4)の搬送速度と略同一の速度に維持するべく第2油圧式無段変速装置(10)を変速制御する制御装置(85)を設ける。【選択図】 図11
