| 摘要 |
PURPOSE:To improve a dust preventive effect and simplify a driving mechanism, by arranging a rotary shaft, not extensible through a heat radiator, at a suction side of the heat radiator and providing a cooling fan and dust preventing rotary sreen on said rotary shaft. CONSTITUTION:A fan shaft 17, not extending through a radiator 6, is fixed through a cover member of the radiator 6 to a front suction side of the radiator 6 in the upper part of an engine main unit 1, and a driven pulley 18, rotary screen 19 and cooling fan 20 are integrally formed and rotatably fitted to the fan shaft 17. A driving pulley 12 and flywheel 13 are axially mounted to the front end of a crankshaft 2 in the engine main unit 1, and a belt 21 is extensibly mounted between the driving pulley 12, counter pulley 15 and the driven pulley 18, then the rotary screen 19 and the cooling fan 20 are integrally rotated. In this way, if the outside air is sucked by the cooling fan 20, dust or the like in the outside air is simultaneously sucked, however, the dust flows not passing a wire net 22, and is blown off to the periphery by centrifugal force of the rotary screen 19. |
