Numerical Analysis of the Lubrication Performance of Textured Raceway Surfaces in Deep Groove Ball Bearings
Severe friction and wear between mechanical components have always posed problems for adaptation to complex and harsh production environments,as well as for meeting the urgent need for superior performance of mechanical equipment.Surface microtexturing technology,as a new method for improving the lubrication and friction performance of friction pairs,has been successfully applied to various mechanical friction pair surfaces,significantly enhancing their overall performance and providing novel optimization designs for contact surfaces.Currently,research on the lubrication and friction characteristics of surface-textured friction contacts with planar contact forms is relatively mature;however,further investigation is required to determine the lubrication characteristics of textured friction pair surfaces with elliptical contact forms.To investigate the effect of microtexture on the elastohydrodynamic lubrication(EHL)performance of an elliptical contact surface in deep groove ball bearings,a textured surface contact EHL analysis model,suitable for deep groove ball bearings,was established based on the EHL theory and considering the effects of groove texturing on the oil film thickness between the friction surfaces.Subsequently,the finite difference method was used to discretize the equations,and numerical calculations were performed using the multigrid method.The influence of the texture depth and radius on the pressure and thickness distribution of the oil film at the contact surface under different loads and entrainment speeds was analyzed.The results showed that the dimensionless oil film pressure on the contact surface of the friction pair increased with increasing load,the dimensionless average oil film pressure increased with increasing entrainment speed,and the dimensionless maximum oil film pressure decreased with increasing entrainment speed.The dimensionless oil film thickness on the contact surface decreased with increasing load and increased with increasing entrainment speed.The dimensionless oil film pressure and thickness on the textured friction pair surface generally showed an increasing trend with increasing texture depth,gradually becoming slower and decreasing after reaching a certain depth.The dimensionless oil film pressure and thickness on the textured friction pair surface generally increased with a decrease in the texture radius,and gradually became slower and decreased when the radius was smaller than a certain value.When the texture depth exceeded 1.5 μm,the dimensionless minimum oil film thickness under different loads increased by an average of 98.65％,and under different entrainment speeds,it increased by an average of 81.65％compared to those of nontextured surfaces.When the texture radius was less than 7 μm,the dimensionless minimum oil film thickness under different loads increased by an average of 31.84％,whereas under different entrainment speeds,it increased by an average of 40.22％.The lubrication performance of the friction pair surface deteriorated with increased loading and improved with increasing entrainment speed.The hydrodynamic effect of the textured surface gradually increased with increasing texture depth and decreased with increasing texture radius.When the groove texture depth of typical deep groove ball bearings was in the range of 1.5 μm to 2.7 μm and the radius was in the range of 3 μm to 7 μm,the lubrication performance of textured friction pair surfaces was optimal,proving that appropriate texture patterns can effectively improve the lubrication performance of the friction pair surfaces of deep groove ball bearings.Studying the lubrication characteristics of textured surfaces of deep groove ball bearings can provide the theoretical basis and guidance for the optimized texture design of friction pair surfaces with elliptical contact types.
万方数据
维普
