Abstract:The hydrodynamic lubrication theoretical model of single texture was established based on the Reynolds equation under the lubrication condition of incompressible Newtonian fluid.By solving the Reynolds equation with the finite difference method and GaussSeidel iterative method,the influence of textured surface with different aspect ratio(parallel velocity direction for length and vertical velocity direction for width) on hydrodynamic lubrication performance was discussed.The unit tribology experimental under the simulation condition of rock bit sliding bearing was carried out by using MMW1 type wear testing machine,the influence of texture aspect ratio on lubrication and tribological properties of textured surface was also discussed.The influence mechanism of texture aspect ratio on texture lubrication and tribological was analyzed by combing the results of numerical simulation and unit tribological experiment.Numerical simulation results show that the influence of texture aspect ratio on hydrodynamic lubrication performance has a great relation with texture depth.When the texture depth is less than the minimum oil film thickness,the smaller the aspect ratio of the texture,the better the dynamic lubrication performance of the texture.When the texture depth is greater than the minimum oil film thickness,the smaller the aspect ratio of the texture,the worse dynamic lubrication performance of the texture.The tribological experimental results show that texture with different aspect ratio can effectively improve tribological properties of textured surface,but the smaller texture aspect ratio,the better the tribological properties of textured surface.The difference between two the result of numerical simulation and the result of unit tribological experiment is that the simulation analysis is based on the hydrodynamic lubrication state,while the unit experimental is based on the mixed lubrication state.