凸轮-挺柱摩擦副涂层的性能分析

Performance Analysis of Cam-Tappet Friction Coating

凸轮-挺柱摩擦副的摩擦磨损对发动机性能具有重要影响。为了研究不同涂层下凸轮-挺柱摩擦副的摩擦磨损,分别针对WC(碳化钨)耐磨涂层、Ni Cr-Cr3C2减摩涂层及不添加涂层3种情况进行摩擦学性能试验。在相同涂层情况下,对具有不同形貌的样件进行磨损试验,得到摩擦系数、磨损质量以及磨损比重等试验曲线和数据。在分析试验数据的基础上,确定凸轮-挺柱摩擦副采用Ni Cr-Cr3C2涂层后,其使用寿命得到提高,并且表面粗糙度大,可起到改善摩擦特性的作用。

Cam-tappet friction and wear has a major impact on engine performance. To study the wear and friction with different coatings of cam-tappet, the tribological performance test was conducted under three coating conditions, which are with WC wear-resistant coating, with NiCr-Cr3C2 anti-friction coating and without coating. In the same coating cases, the author conducted the test with specimens of different mor- phologies, obtained test curves and data of friction coefficient, wear quality and proportion. Based on the test data, it＇s easy to know that NiCr-Cr3C2 coating on the cam-tappet does good to extend its life, besides, the surface roughness plays an important role in improving the friction characteristics.