风扇是发动机冷却系统中的一个重要组成部分。在车用水冷式发动机上,广泛采用前后都无导流装置的轴流式风扇,它是由叶片和托板组成。其动力是通过皮带轮传递的。这种风扇的结构简单、布置方便、扇风量大。风扇叶片旋转时的扇风量主要处决于它的直径、转速、叶片形状、叶片螺旋角度及叶片数目等。风扇叶片与发电机之间由曲轴皮带轮通过三角皮带驱动,当风扇叶片产生损伤变形时,将会降低散热效果; Fans are an important part of the engine cooling system. In the car with water-cooled engine, widely used before and after the device without axial flow fan, which is composed of blades and pallet. Its power is transmitted through the pulley. This fan has the advantages of simple structure, convenient layout and large fan volume. Fan fan rotation fan air volume mainly depends on its diameter, speed, blade shape, the blade angle and the number of leaves and other spiral. Between the fan blades and the generator is driven by the crankshaft pulley through the V-belt, when the fan blade is damaged and deformed, the heat dissipation effect will be reduced;