发动机排气门在高温冲击环境下工作 ,恶劣的工况是使排气门失效的重要原因之一。在这种工况下 ,环境介质、气门机构的动力学特性都可使排气门早期失效 ,但大量的研究表明 ,在正常情况下 ,导致排气门失效的主要因素是温度及冲击力。1　温度的影响当发动机工作时 ,其排气门的工作 Engine exhaust valve in high temperature impact environment, poor conditions is one of the important reasons for the exhaust valve failure. In this condition, the dynamic characteristics of the environment medium and the valve mechanism can make the exhaust valve fail early, but a large number of studies show that under normal conditions, the main factors that cause the exhaust valve to fail are the temperature and the impact force. 1 temperature effect When the engine is working, its exhaust valve work