考虑热弹性变形的角接触球轴承微观热弹流分析  

Micro Thermal Elastohydrodynamic Lubrication Analysis of Angular Contact Ball Bearing Considering Thermal Elastic Deformation

作　　者：路遵友[1,2] 吕延军 张永芳[3] 康建雄 刘成 李莎 LU Zunyou;LU Yanjun;ZHANG Yongfang;KANG Jianxiong;LIU Cheng;LI Sha(School of Mechanical and Precision Instrumental Engineering, Xi ＇an University of Technology, Shaanxi Xi ＇an 710048, China;State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Hubei Wuhan 430074, China;School of Printing, Packaging Engineering and Digital Media Technology, Xi ＇an University of Technology, Shaanxi Xi ＇an 710048, China)

机构地区：[1]西安理工大学机械与精密仪器工程学院,陕西西安710048 [2]华中科技大学数字制造装备与技术国家重点实验室,湖北武汉430074 [3]西安理工大学印刷包装与数字媒体学院,陕西西安710048

出　　处：《摩擦学学报》2018年第3期299-308,共10页Tribology

基　　金：国家自然科学基金项目(51375380);数字制造装备与技术国家重点实验室开放课题(DMETKF2017014);陕西省自然科学基金项目(2014JM2-5082);陕西省教育厅科学研究计划项目(15JS068)资助~~

摘　　要：运用点接触热弹性流体动压润滑理论,考虑了润滑油膜温升变化引起的角接触球轴承中滚珠和内圈接触表面的热弹性变形和表面随机粗糙度的影响,提出了一种计入热弹性变形和随机粗糙度影响的角接触球轴承热弹性流体动压润滑分析方法.该方法通过将热弹性变形进行热力转换,得到了滚珠和内圈接触表面的材料线热膨胀系数,计算修正了滚珠和内圈表面因油膜温度场变化引起的热弹性变形,求得了计入热弹性变形和表面粗糙度后的油膜压力、油膜厚度、油膜温升以及热弹性变形等主要润滑特性,研究了内圈转速、滑滚比和滚珠数量的变化对油膜厚度和油膜压力的影响规律,结果表明:最大热弹性变形量与最小油膜厚度处在同一量级,并且内圈转速、滑滚比和滚珠数量的变化对油膜厚度和压力会产生明显的影响.进一步对比分析了几种算法下的最小膜厚,验证了计入热弹性变形的数值算法的可行性.By considering the thermal elastic deformation and random surface roughness of contact surface between ball and inner race of angular contact ball bearing caused by lubricant temperature rise, a numerical method for analyzing point contact thermal elastohydrodynamic lubrication of angular contact ball bearing was proposed based on the point contact thermal elastohydrodynamic lubrication theory. According to heat transfer of thermal elastic deformation, the material line thermal expansion coefficients of contact surface between rolling ball and inner race were obtained, the thermal elastic deformation caused by lubricant temperature rise was modified. The oil film pressure, the oil film thickness, the oil film temperature rise and the thermal deformation were calculated by considering thermal elastic deformation and random surface roughness. The effects of different rotational speeds of the inner race, slide-to-roll ratios and number of rolling balls on the oil film thickness and the oil film pressure were studied. The results show that thermal elastic deformation and minimum oil film thickness were in the same order of magnitude, and the rotational speeds of the inner race, slide-to-roll ratios and number of rolling balls had profound influences on lubrication performance.Furthermore, the minimum film thickness of several algorithms was compared and analyzed, and the feasibility of the numerical algorithm considering thermal elastic deformation was verified.

关 键 词：热弹流润滑 热弹性变形 角接触球轴承 

分 类 号：TH133.31[机械工程—机械制造及自动化]