The contact deformation in the meshing process of cylindrical gears affects the lubrication behavior of cylindrical gears, which is a typical problem of Elastohydrodynamic Lubrication (EHL). Accurate elastohydrodynamic lubrication analysis can provide a basis for failure prediction of cylindrical gears, such as pitting, wear and fatigue failure.
So far, a large number of scholars have studied the elastohydrodynamic lubrication of cylindrical gears. Wang et al. Compared the oil film pressure and contact clearance of rough surface with or without lubrication under ultra-low speed, and verified the feasibility of direct solution method for predicting mixed lubrication behavior. Zhu et al. Used progressive mesh densification algorithm to further improve the calculation efficiency and solution accuracy. The effects of inclusion and non-uniform lubrication field on the surface crack are studied. Subsequently, Lu et al. Studied the lubrication behavior of gradual establishment and collapse of oil film during start / stop. He et al. Studied the influence of mesh discretization on the calculation accuracy of point contact and three-dimensional line contact hybrid lubrication, compared the solution of two-dimensional line contact lubrication model, and summarized the influence of surface morphology in different directions on lubrication behavior. Kan Guangxiao et al. And Guo Manli et al. Simulated and studied the effects of different structural parameters of cylindrical gears on thermoelastohydrodynamic lubrication behavior.
Firstly, based on the meshing dynamic analysis of cylindrical gear, the time-varying parameters of tooth surface contact are obtained. Then, based on the elastic hydrodynamic lubrication contact model, considering the micro morphological characteristics of tooth surface contact surface, the time-varying pressure and friction distribution of cylindrical gear meshing are analyzed and calculated, and then the near-field stress / strain of tooth surface is obtained. Finally, the multiaxial fatigue life prediction model based on SWT critical plane is established to calculate the pitting fatigue life of cylindrical gear, The experimental method is used to verify the model.