The tribological performance of the piston ring–cylinder liner pair is affected by multiple factors. In this study, the orthogonal test method is used to comprehensively explore the influence of oil dilution, cylinder liner surface coating, and working conditions on the friction and wear of the piston ring–cylinder liner pair. The orthogonal test results show that a certain degree of oil dilution is beneficial to the performance, so the influence of oil dilution is further investigated by using the control variable method. The results show that the liner wear depth decreases first and then increases with the increase of oil dilution. Combined with the scanning electron microscope and energy dispersive X-ray spectroscopy results, it is found that the formation of tribofilm is promoted with a small amount of oil dilution under different working conditions. Meanwhile, a diamond-like carbon (DLC) coating ring and an Fe-based coating cylinder liner can significantly improve the scuffing resistance performance of the piston ring–cylinder liner pair.

活塞环-缸套对的摩擦学性能受多种因素影响。在这项研究中，使用正交试验方法全面研究了油稀释，气缸套表面涂层和工作条件对活塞环-气缸套对的摩擦和磨损的影响。正交试验结果表明，一定程度的机油稀释度对性能有利，因此采用控制变量法进一步研究了机油稀释度的影响。结果表明，随着油稀释度的增加，衬套的磨损深度先减小，然后增大。结合扫描电子显微镜和能量色散X射线光谱分析结果，发现在不同的工作条件下，少量的油稀释可以促进摩擦膜的形成。同时，类金刚石碳（DLC）涂层环和铁基涂层气缸套可以显着提高活塞环-气缸套对的耐擦伤性能。