PROBLEM TO BE SOLVED: To provide a combine harvester, in which the driving speed of a feed chain can be changed independently with respect to the driving speed of a mower and thereby the transfer state of the mowed grain culm from the mower to the feed chain may be smoothly maintained to enhance the efficiency of the threshing operation.SOLUTION: The combine harvester comprises: a travel unit (2) disposed in a lower portion of a machine body frame (1) having an engine (62) mounted thereon a thresher (3) disposed in the upper portion of the machine body frame (1) and having a feed chain (12B) and a mower (4) disposed on the front side of the body frame (1) for mowing the grain culm in a farm field and transferring the grain culm to a feed chain (12B). Then, the combine harvester further comprises: a first hydraulic type stepless speed variator (66) for driving the travel unit (2) and the mower (4) a second hydraulic type stepless speed variator (10) for driving the feed chain (12B) and a control device (100) for controlling the speed of the second hydraulic type stepless speed variator (10) in accordance with the output revolving speed of the first hydraulic type stepless speed variator (66).COPYRIGHT: (C)2014,JPO&INPIT【課題】フィードチェンの駆動速度を刈取装置の駆動速度に対して独立して変速できるものとし、刈取装置からフィードチェンへの刈取穀稈の引き継ぎ状態を円滑に維持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)の下部に走行装置(2)を設け、機体フレーム(1)の上部にはフィードチェン(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)へ引き継ぐ刈取装置(4)を設けたコンバインであって、走行装置(2)と刈取装置(4)を駆動する第1油圧式無段変速装置(66)と、フィードチェン(12B)を駆動する第2油圧式無段変速装置(10)を備え、第1油圧式無段変速装置(66)の出力回転速度に応じて第2油圧式無段変速装置(10)を変速制御する制御装置(100)を備える。【選択図】 図9
