CNG发动机排气门—气门座磨损失效分析

针对某CNG发动机在工作过程中出现的排气门—气门座严重磨损故障,采用宏观检验、几何学测定、化学成分测定、金相检验等手段,对该排气门—气门座的几何尺寸、金相组织、硬度等进行了检测分析,对排气门—气门座的磨损状况进行了研究。研究表明,发动机燃料、排气门—气门座材料匹配及配气系统结构设计等是影响排气门—气门座磨损失效的主要因素。提出了改善排气门—气门座磨损状况的相关措施,经试验验证,改进效果良好。

Failure Analysis of Exhaust Valve-valve Seat Wear for CNG Engine

For the exhaust valve-valve seat wear of CNG engine,the geometry dimension,microstructure and stiffness of exhaust valve-valve seat were detected and analyzed by the way of macro examination,geometry measurement and chemical component analysis.In addition,the wear state of exhaust valve-valve seat was studied.The results show that the engine fuel,exhaust valve-valve seat material match and valve train system structure are the main factors influencing exhaust valve-valve seat wear.In the end,the measures of improving the exhaust valve-valve seat wear are put forward and verified.