COMBINE

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.