齿轮啮合过程中齿面时变摩擦特性对齿轮性能有重要的影响，为了研究不同形貌齿面的时变摩擦特性，利用双盘摩擦试验探讨了在线接触状态下表面形貌对摩擦因数的影响，并结合ISO 25178三维表面形貌表征参数进行了分析，然后利用试验结果研究了具有不同齿面特征的齿轮在啮合过程中摩擦因数的变化情况。研究表明，载荷、卷吸速度和滑滚比对接触面间摩擦特性的影响有着不同规律，表面形貌结构对接触面润滑拖动曲线的非线性上升区有一定影响；由于表面形貌的影响，双盘试验数据模拟的齿面摩擦特性与EHL数值模型计算结果有一定差异，并且在齿轮不同啮合区域表面形貌对于齿面摩擦因数曲线的影响程度不同，研究结果将为通过表面形貌设计改善齿面摩擦性能提供理论基础。
In the process of gear meshing, the time-varying friction characteristics have an important influence on the performance of gears. In order to study the time-varying friction characteristics of tooth surfaces with different topography, the influence of surface topography on the friction coefficient under line contact condition is studied by the twin-disc tribo-tester, and the surface topography characteristic is analyzed by 3D surface topography parameters of ISO 25178. The variation of friction coefficient in the gear meshing process is simulated by using the experimental results. The results show that the influences of load, entrainment speed and sliding-rolling ratio on the friction characteristics of the contact surface are different. The micro structure characteristics of surface topography change the contact surface traction curve, and the nonlinear rise area is greatly affected. Due to the influence of surface topography, there are differences between the simulation results of experimental data based on twin-disc tribo-tester and the calculation results of EHL numerical model, and the influence of surface topography on the gear friction coefficient curve is different along the contacting line of gears. The research results will provide a theoretical basis for the design of surface topography to improve the tribological properties of gear system.
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