PROBLEM TO BE SOLVED: To provide a combine harvester not only capable of reaping unreaped grain culms (falling-down grain culms or the like) by singly changing the rotating speed of a hydraulic motor to the low-speed side irrelevantly to the rotating speed of a hydraulic pump, but also capable of changing the traveling speed to high-speed side by singly carrying out the changing operation of the rotating speed of the hydraulic motor irrelevantly to the rotating speed of the hydraulic pump on the travel on a road such as movement between fields.SOLUTION: The combine harvester is obtained by installing a stepless hydraulic speed-changing mechanism 107 equipped with the hydraulic pump 105 and the hydraulic motor 106, and constituting the hydraulic pump 105 so as to be a variable volume type steplessly freely changing the speed to an advancing rotation state and a retreating rotation state. The hydraulic motor 106 is constituted so as to be a variable volume type enabling the changing operation of the rotation speed of the hydraulic motor 106 to a high speed such as an on-street traveling speed, a middle speed such as a standard reaping speed, and a low speed such as a falling-down grain culm-reaping speed for reaping the falling-down grain culms.COPYRIGHT: (C)2012,JPO&INPIT【課題】油圧ポンプの回転速度とは無関係に、単独で、前記油圧モータの回転速度を低速側に変更操作して、未刈り穀稈(倒伏穀稈など)を刈取ることができる一方、圃場間の移動など路上走行において、前記油圧ポンプの回転速度とは無関係に、単独で、前記油圧モータの回転速度を変速操作して高速側に移動速度を変更操作できるようにしたコンバインを提供するものである。【解決手段】油圧ポンプ105及び油圧モータ106を備える無段油圧変速機構107を設け、前進回転状態及び後進回転状態に無段階に変速自在な可変容量形に前記油圧ポンプ105を構成したコンバインにおいて、前記油圧モータ106の回転速度を、路上走行速度などの高速度、標準刈取速度などの中速度、または倒伏穀稈を刈取る倒伏刈取速度などの低速度に、変更操作可能な可変容量形に前記油圧モータ106を構成したものである。【選択図】図18
