| 摘要: |
| 织构化深沟球轴承摩擦副表面的接触形式、织构形态对轴承润滑性能的影响机制尚不明确。为探究微织构对深沟球轴承椭圆接触摩擦副表面弹流润滑性能的影响，基于弹流润滑理论，考虑滚道织构对于摩擦表面间油膜厚度的影响作用，建立一种适用于深沟球轴承的织构化表面接触弹流润滑分析模型。然后，采用多重网格法进行数值计算，根据结果分析不同载荷及卷吸速度下织构深度和半径对接触表面油膜压力和厚度分布的影响规律。结果表明，摩擦副表面的润滑性能随着载荷的增大而变差，随着卷吸速度的增大而变好；织构化表面的流体动压效应则随着织构深度的增加而逐渐增大，随着织构半径的增大而逐渐减小，当典型深沟球轴承的滚道织构深度在 1.5~2.7 μm，半径在 3~7 μm 范围时，织构化摩擦副表面的润滑性能表现最佳，证明适当的织构型式可有效改善深沟球轴承摩擦副表面的润滑性能。研究织构对深沟球轴承摩擦副表面的润滑特性规律，可以为椭圆接触类型摩擦副的织构化优化设计提供理论参考。 |
| 关键词: 织构化表面 椭圆接触 弹流润滑 深沟球轴承 油膜厚度 |
| DOI：10.11933/j.issn.1007-9289.20230710001 |
| 分类号:TH133；TH117 |
| 基金项目:国家自然科学基金（62241308）；甘肃省科技计划项目（23JRRA761） |
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| Numerical Analysis of the Lubrication Performance of Textured Raceway Surfaces in Deep Groove Ball Bearings |
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DENG Linfeng，JIN Zeyuan
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School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou 730050 , China
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| Abstract: |
| 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. |
| Key words: textured surface elliptical contact elastohydrodynamic lubrication deep groove ball bearing film thickness |
