PROBLEM TO BE SOLVED: To provide a work vehicle prime mover part structure ensuring the high intake capacity of a radiator fan and high exhaust capacity of a dust exhaust fan, capable of suppressing engine overheat, and lower in the frequency of maintenance and inspection work.SOLUTION: A radiator fan (20) and a dust exhaust fan (30) are provided on the same axial center, a blade angle of a blade (30A) of the dust exhaust fan (30) is set opposite to a blade angle of a blade (20A) of the radiator fan (20), drive-state switching means (45) for switching the dust exhaust fan (30) to a stopped state when the radiator fan (20) is driven and switching the dust exhaust fan (30) to a driven state when the radiator fan (20) is stopped, and the drive-state switching means (45) is arranged adjacent to an inner side of a body of the fan arranged inside of the body which is either the radiator fan (20) or the dust exhaust fan (30). As a result, the object of the invention is attained.COPYRIGHT: (C)2015,JPO&INPIT【課題】ラジエータファンの吸入能力と排塵ファンの排気能力が高く、エンジンのオーバヒートを抑制し、保守・点検作業の頻度が少ない作業車輌の原動部構造を提供する。【解決手段】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、駆動状態切換手段(45)を、ラジエータファン(20)または排塵ファン(30)のうち、機体内側に配置されるファンの機体内側に隣接して配置することにより解決される。【選択図】図6
