PROBLEM TO BE SOLVED: To improve durability of an air cooling/dust removing switching mechanism in a driving part structure of a working vehicle for cooling a radiator, by cooling wind which is filtered by a dust prevention net.SOLUTION: A cooling fan 12 is covered with a cooling fan case A, and a cooling air inlet and a dust removing outlet are provided at a radiator 13 side of the cooling fan case A. A dust removing inlet and a cooling air outlet are provided at an opposite side to the radiator 13 of the cooling fan case A. In an air cooling state, the dust removing inlet and the dust removing outlet are closed, and the cooling air inlet and the cooling air outlet are opened, and air is blown from the cooling air inlet to the cooling air outlet by the cooling fan 12. In a dust removing state, the cooling air inlet and the cooling air outlet are closed, and the dust removing inlet and the dust removing outlet are opened, and air is blown from the dust removing inlet to the dust removing outlet by the cooling fan 12.COPYRIGHT: (C)2012,JPO&INPIT【課題】防塵網で濾過した冷却風によってラジエータを冷却する原動部構造において、冷却・除塵切換機構の耐久性を高める。【解決手段】冷却ファン12を冷却ファンケースAにより被覆し、該冷却ファンケースAにはラジエータ13側に冷却吸気口及び除塵送風口を設け、冷却ファンケースAのラジエータ13との反対側に、除塵吸気口及び冷却送風口を設け、冷却状態においては除塵吸気口及び除塵送風口を閉鎖させて冷却吸気口及び冷却送風口を開口させ、冷却ファン12によって冷却吸気口から冷却送風口へ送風し、除塵状態においては冷却吸気口及び冷却送風口を閉鎖させて除塵吸気口及び除塵送風口を開口させ、冷却ファン12によって除塵吸気口から除塵送風口へ送風する。【選択図】図3
