采用宏观、微观、化学成分分析等多种检验方法对某柴油机连杆瓦台架磨合试验短时间后即发生咬死失效的原因进行了分析.结果表明:该连杆瓦咬死是由于柴油机油道清洁度不达标所致;结合其受力情况,认为连杆瓦初期磨损主要是因为机油中存在着较多的杂质颗粒造成连杆瓦表面拉伤,而下瓦由于工况更为恶劣因此剥落更为严重,其产生的剥落颗粒进一步加剧了上瓦磨损,最终导致连杆瓦发生咬死失效.

The scuffing failure reasons of connecting rod bearing shells of a diesel after a short time of running-in bench test were analyzed by macro,micro and chemical compositions analysis.The results show that scuffing failure of the connecting rod bearing shells was mainly caused by the non-compliance cleanliness.Combining the force situation,it was considered that the early wear was mainly because there were a lot of impurities in the oil which induced surface scratch of the connecting rod bearing shells.The damage of the lower shell was more serious because of its bad working condition,and particles falling from the lower shell accelerated the wear of the upper shell,which finally resulted in scuffing failure of the connecting rod bearing shells.