高速角接触球轴承腔内气相流动与传热特性研究  

Investigation of Air Flow Pattern and Heat Transfer Efficiency Inside Cavity of High-Speed Angular Contact Ball Bearing

作　　者：翟强[1] 闫柯[1,2] 张优云[1] 洪军[2] 朱永生[2] 

机构地区：[1]西安交通大学现代设计与转子轴承系统教育部重点实验室,西安710049 [2]西安交通大学机械制造系统工程国家重点实验室,西安710049

出　　处：《西安交通大学学报》2014年第12期29-33,40,共6页Journal of Xi'an Jiaotong University

基　　金：国家重点基础研究发展计划资助项目(2011CB706606);中央高校基本科研业务费专项资金资助项目(08143063)

摘　　要：针对高速运转滚动轴承腔内空气在接触区周围形成的高压区阻碍润滑介质进入,从而导致供油效率降低的问题,以B7008C角接触球轴承为研究对象,考虑轴承几何结构细节,建立了角接触球轴承腔内气相流动模型,采用旋转坐标系描述轴承各组件运动,分析滚动轴承在不同转速与保持架结构参数下的气相流动。用该模型分析了轴承腔内气相流场,揭示了轴承公转、钢球自旋、保持架结构等因素对轴承腔内气相流型与传热效率的影响规律。结果表明:随着公转转速升高,气流速度升高,轴承腔内压差增大;高速下钢球的自旋效应使轴承腔内气压升高,分布不均匀性加剧;保持架兜孔形状、兜孔结构等参数影响换热效率与压力场分布,随兜孔间隙增大,保持架对流换热系数升高。轴端贴近轴承内圈处是配置供油单元出口的理想位置。When a bearing operates at high speed, the high pressure region around the ball- raceway contact zone prevents the lubricant to enter the bearing cavity, resulting in a decrease of oil supply efficiency. To investigate the air phase flow pattern inside bearing cavity for the optimization of oil-air two-phase lubrication method, a high precision numerical model of air phase flow pattern inside angular contact ball bearing cavity is proposed. Comprehensive factors, including bearing motion features and cage structure, are considered to investigate their influences on the air phase flow pattern. Results show that the ball rotation leads to uneven pressure distributions. The air phase velocity, pressure, and heat transfer efficiency of cage increase when the ball revolving speed increases. The position near the inner ring on the bigger axial side is the ideal position to mount the lubrication unit. The heat transfer efficiency of cage and pressure field are sensitive to the cage structure. When the cage pocket clearance increases, the heat transfer efficiency of cage increases.

关 键 词：高速角接触球轴承 气相流场 换热效率 保持架结构 

分 类 号：TH133[机械工程—机械制造及自动化]