PROBLEM TO BE SOLVED: To provide an air-cooled engine which can suppress a trouble that refuse such as long cut grass enters a fan case, and also can suppress a trouble that cut pieces of the refuse such as cut grass are blocked between outer teeth and a dust prevention wall.SOLUTION: A blower part 7 which inclines with respect to the rotation direction is provided for the outer tooth 6 so that air 10 is sucked out from a gap 8 between the outer tooth 6 and the dust prevention wall 5 to the outside of the fan case 1 by the rotating blower part 7. A plurality of inner teeth 9 which rotate along the inner circumferential surface of the dust prevention wall 5 can be provided for the peripheral part 4a of a filter plate.COPYRIGHT: (C)2012,JPO&INPIT【課題】ファンケース内に長い刈草等の塵芥が進入する不具合を抑制することができるとともに、刈草等の塵芥の切断片が外歯と防塵壁との間に詰まる不具合を抑制することができる空冷エンジンを提供する。【解決手段】外歯6に回転方向に対して傾斜する起風部7を設け、回転する起風部7で外歯6と防塵壁5との隙間8からファンケース1外に空気10を吸い出すことができるようにした。フィルタプレート周縁部4aに防塵壁5の内周面に沿って回転する複数の内歯9を設けてもよい。【選択図】図1
