| 摘要 |
PURPOSE:To shake off dust which is attached to a dust preventer body by a method wherein the dust preventer is so installed free to incline in front of a radiator as to be vibrated in accordance with the variation of an engine speed. CONSTITUTION:When an engine 13 is driven, a suction fan 17 rotates to take air in through a radiator cover 39, a dust preventer 23 and a radiator 15. When the engine 13 speed is low, the suction fan 17 rotates at a low speed and the dust preventer 23 is turned clockwise by gravity against the pressure of an intake wind to contact with a stopper 37 and keeps this position. When the engine 13 speed becomes high, the suction fan 17 also rotates at a high speed to make an intake air speed fast and the dust preventer 23 is turned by the intake wind pressure counterclockwise. That is, the dust preventer 23 turns to the right or the left direction in accordance with the speed of engine 13, and the dusts stuck to the dust preventer 23 are shaken off by the vibration. |
