目的 研究入/出口阶梯面界面滑移对阶梯轴承油膜厚度和摩擦因数的影响。方法 通过建立考虑入/出口阶梯面不同程度的界面滑移的一维阶梯滑块模型，求解不同入/出口滑移比例下的油膜厚度和摩擦因数。在阶梯滑块工作面制备含氟类金刚石涂层(F-DLC)，在平行间隙条件下研究了有无含氟类金刚石涂层对油膜润滑性能的影响，并与理论计算结果进行比较。结果 当滑移只发生在入口阶梯面时，随着滑移程度的增大，油膜厚度增大，摩擦因数减小;当滑移只发生在出口阶梯面时，随着滑移程度的增大，油膜厚度减小，摩擦因数减小。当润滑油在入口和出口阶梯面均发生滑移时，会产生油膜厚度及摩擦因数同时减小或油膜厚度增大而摩擦因数减小2种结果。试验结果表明，F-DLC涂层阶梯滑块的膜厚最大且摩擦因数最小，没有涂层的结论与之相反。产生这一特殊现象是由于润滑油在阶梯滑块入口区和出口区的滑移程度不同。由于激光加工形成了微凸体结构以及F-DLC涂层的协同作用，入口区的滑移程度比出口区的大，从而膜厚增大;同时滑移的存在使其摩擦因数降低。结论 在入/出口的界面滑移对阶梯滑块轴承的影响下，会产生2种结果，得到了可以同时满足油膜承载力增大且摩擦因数减小的入/出口滑移比例关系。通过试验验证了在阶梯滑块表面发生一定滑移的条件下，会在理论计算的油膜厚度增大的同时出现摩擦因数减小的情况。

The work aims to study the effect of interfacial slip at the inlet step/outlet land on the oil film thickness and coefficient of friction (COF) of the step bearing. The oil film thickness and coefficient of friction were solved by establishing a one-dimensional step slider model taking account of interfacial slip at the inlet step and outlet land. At the same time, fluorinated diamond-like carbon (F-DLC) coatings were prepared on the contact surface of the step slider, and the effect of F-DLC coatings on the lubrication performance was studied under the condition of parallel contact gap and compared with the results of theoretical calculation. The theoretical results showed that when the interfacial slip occurred only at the inlet step, the oil film thickness increased and the COF decreased with the interfacial slip increasing. When the interfacial slip only occurred at the outlet land, with the increase of the interfacial slip, both the oil film thickness and the COF decreased. When the interfacial slip occurred on both the inlet step and the outlet land, there were two results:the oil film thickness and the COF decreased at the same time or the oil film thickness increased and the COF decreased. The experimental results showed that the step slider coated with F-DLC had the maximum film thickness and the minimum COF at the same time, which was opposite to the uncoated step slider. This unique phenomenon was due to the different interfacial slip at the inlet step and outlet land of the step slider caused by the synergistic effect of the micro-convex structure formed by laser processing in the inlet step and the F-DLC coating. The interfacial slip at the inlet step was larger, leading to an increase in film thickness. And at the same time, the existence of interfacial slip made the COF decrease. Under the influence of the inlet/outlet interface slip on the step sliding block bearing, there are two results. The relationship between the interfacial slip ratio at the inlet step and outlet land that can satisfy the commands what can make the carrying capacity and the COF increase synchronously is obtained. The study shows it is experimentally verified that the oil film thickness increases and the COF decreases under certain slippage conditions.