A mixed elastohydrodynamic lubrication (EHL) model for a coated angular contact ball bearing is developed by coupling the influence coefficients with the unified deterministic mixed EHL model. Based on the bearing quasi‐dynamics analysis, the influences of the surface roughness, coating thickness, and boundary friction coefficient on the mixed EHL performance of the coated bearing are discussed. The results reveal that high surface root‐mean‐square roughness can be detrimental to bearing lubrication performance and increase the risk of coating failures. Coating thicknesses on the order of a few microns have a limited effect on the contact load ratio, film thickness ratio, and friction coefficient while having a significant effect on the maximum surface tensile stress and interfacial shear stress, especially for high‐friction low‐speed conditions. A low‐friction self‐lubricating coating can effectively improve the tribological performance and prolong the service life of the bearing, especially in the bad lubrication state with severe asperity contacts.

中文翻译：

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考虑动态特性的带涂层角接触球轴承的混合润滑

通过将影响系数与统一的确定性混合EHL模型耦合，开发了用于涂层角接触球轴承的混合弹性流体动力润滑（EHL）模型。基于轴承的准动力学分析，讨论了表面粗糙度，涂层厚度和边界摩擦系数对涂层轴承的混合EHL性能的影响。结果表明，高的表面均方根粗糙度可能不利于轴承润滑性能，并增加涂层失效的风险。涂层厚度在几微米的数量级上对接触载荷比，薄膜厚度比和摩擦系数的影响有限，而对最大表面拉伸应力和界面剪切应力的影响却很大，特别是对于高摩擦低速时使适应。