PROBLEM TO BE SOLVED: To provide a combine that has enhanced work efficiency by enhancing cooling efficiency and combustion efficiency of an engine.SOLUTION: An infinite variable-speed drive (16) is alternately switched between a cooling state in which the fan (40) is rotated in a normal direction and ambient air is suctioned from the outside to the inside of a filter body (12A, 12B and 12C), and a dust removal state in which the fan (40) is rotated in a reverse direction and air is blown from the inside to the outside of the filter body (12A, 12B and 12C). When it is detected that a variable-speed gear (183) is in a low speed state, the cooling state is caused to continue for a first set time, and when it is detected that the variable-speed gear (183) is in a high speed state, the cooling state is caused to continue for a second set time that is longer than the first set time.COPYRIGHT: (C)2014,JPO&INPIT【課題】エンジンの冷却効率及び燃焼効率を高めることで、作業効率を高めたコンバインを提供する。【解決手段】無段変速装置(16)は、前記ファン(40)を正回転させ、濾過体(12A,12B,12C)の外側から内側へ外気を吸入する冷却状態と、ファン(40)を逆回転させ、濾過体(12A,12B,12C)の内側から外側へ送風する除塵状態とに交互に切替わる構成とし、変速装置(183)が低速状態であることが検出された場合に、冷却状態を第1設定時間継続させ、変速装置(183)が高速状態であることを検出した場合には、冷却状態を第1設定時間よりも長い第2設定時間継続させることにより解決される。【選択図】図4
