气缸套和活塞环早期失效原因分析

Analysis on Early Failure of Cylinder Liner and Piston Ring

本文解剖分析了汽车发动机中气缸套和活塞环早期失效的原因,是气缸套中磷共晶组织网状分布和石墨分布的不均匀,表面有擦伤,犁沟,剥落;活塞环镀铬层有裂纹和块状剥落。剥落碎片使得气缸套和活塞环之间引起磨粒磨损,形成了在滑动条件下的擦伤磨损和磨粒磨损共存状态,使磨损率显著增加。

This paper deals with analysis on early failure of cylinder liner and piston ring in some automobile engines. In relation to the contributing factors, the following facts came into our notice: There appear in the cylinder liner the unevenly distribution of phospor eutectic networks, with scuffings, plow grooves, and peelings off on the surface of these cylinder liners. There appear cracks and chunk peelings in the chrome-plated layer of these piston rings. It is sug- gested that these peeling off fragments cause the wearing of abrasive grains be- tween the cylinder liner and piston ring. The resulting coexistence of scuffing wear and abrasive wear leads to significant increase of the rate of wear. This may be accounted for the early failure of these cylinder liners and piston rings.