PROBLEM TO BE SOLVED: To provide a prime mover part of mobile vehicle having high exhaust capacity of a dust discharge fan and high suction performance of a radiator fan, capable of suppressing overheat of an engine, and which requires less frequent maintenance and inspection work.SOLUTION: A radiator fan (20) and a dust discharge fan (30) are disposed on a same axis. A blade angle of a blade (30A) of the dust discharge fan (30) is an opposite blade angle of a blade angle of a blade (20A) of the radiator fan (20). When the radiator fan (20) is in a driving state, the dust discharge fan (30) is switched to a stopped state. When the radiator fan (20) is stopped, the dust discharge fan (30) is switched to the driving state by driving state switch means (45).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)の翼角と反対翼角に設け、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)を設けることにより解決される。【選択図】図3
