发动机运转时,泄漏的气体会由气缸进入曲轴箱内。随着发动机负荷增大,泄漏气体也会增加,压力随之上升。正常工作时发动机必须排出这些气体,以免压力将机油挤向密封位置处。为避免发生这种情况,发动机上基本上安装了封闭式曲轴箱通风装置,以将不含发动机油的绝大部分泄漏气体送入进气系统内并确保曲轴箱内不会产生正压力。在当代发动机上,一个可以产生较小压力的进气装置 When the engine is running, the leaking gas will enter the crankcase through the cylinder. As the engine load increases, the leak gas will increase and the pressure will increase. The engine must discharge these gases during normal operation to prevent pressure from squeezing the oil to the sealing position. To avoid this, a basically enclosed crankcase ventilation is installed on the engine to feed most of the leak-free gas without engine oil into the intake system and to ensure that positive pressure is not generated in the crankcase. On contemporary engines, an air intake that produces less pressure