PROBLEM TO BE SOLVED: To suppress overheat of an engine of a combine-harvester.SOLUTION: A radiator fan (20) for sucking outside air and a dust-discharging fan (30) for discharging which are driven through a first belt (22) and a second belt (32) for power transmission from a rotational axis (10) in the horizontal direction arranged outside an engine (E) are arranged between the engine (E) and a radiator (50) cooling the cooling water of the engine (E). The radiator fan (20) and the dust-discharging fan (30) are provided on the same shaft center, and a wing angle of a blade (30A) of the dust-discharging fan (30) is set to an opposite angle to a wing angle of a blade (20A) of the radiator fan (20). There is provided drive state switching means (45) for switching the dust-discharging fan (30) to a stop state in a drive state of the radiator fan (20), and switching the dust-discharging fan (30) to the drive state in the stop state of the radiator fan (20).COPYRIGHT: (C)2015,JPO&INPIT【課題】コンバインのエンジンのオーバヒートを抑制する。【解決手段】エンジン(E)と該エンジン(E)の冷却水を冷却するラジエータ(50)の間に、エンジン(E)の外側に配置された左右方向の回転軸(10)から伝動用の第1ベルト(22)と第2ベルト(32)を介して駆動される外気吸入用のラジエータファン(20)と排気用の排塵ファン(30)を配置し、ラジエータファン(20)と排塵ファン(30)を同一軸心上に設け、排塵ファン(30)の羽根(30A)の翼角を、ラジエータファン(20)の羽根(20A)の翼角と反対の角度に設定し、ラジエータファン(20)の駆動状態時に、排塵ファン(30)を停止状態に切換え、ラジエータファン(20)の停止状態時には、排塵ファン(30)を駆動状態に切換える駆動状態切換手段(45)を設ける。【選択図】図3
