Journal of South China University of Technology (Natural Science Edition) ›› 2013, Vol. 41 ›› Issue (11): 134-148.doi: 10.3969/j.issn.1000-565X.2013.11.024

• Automotive Engineering • Previous Articles     Next Articles

Numerical Analysis of Grease Elastohydrodynamic Lubrication of Automotive Wheel Hub Bearing Under Actual Working Conditions

Chen Ying- jun Huang Ping   

  1. School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2013-05-16 Revised:2013-07-05 Online:2013-11-25 Published:2013-10-11
  • Contact: 陈英俊(1979-)，男，博士生，讲师，主要从事润滑及微机电系统理论与应用研究． E-mail:chen.sam@mail.scut.edu.cn
  • About author:陈英俊(1979-)，男，博士生，讲师，主要从事润滑及微机电系统理论与应用研究．
  • Supported by:

    国家自然科学基金资助项目 (51175182);清华大学摩擦学国家重点实验室开放基金重点资助项目(SKLTKF12B14);茂名市科技计划项目(20120259)

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Abstract:

Due to the high initial viscosity,obvious non- Newtonian property and small equivalent radius in thegrease lubrication of automotive wheel hub bearing under actual working conditions,great difficulties arise in thecorresponding elastohydrodynamic lubrication (EHL) calculation.In order to solve this problem,basic grease lu-brication equations are derived,non- dimensionalized and difference- solved sequentially.After that,the numericalsolutions of EHL of greased and lubricated wheel hub bearing,such as the pressure distribution and the thicknessshape of lubrication film,are obtained.The results show that (1) in greased and lubricated wheel hub bearings,there exist a second pressure peak and thickness necking similar to those under oil lubricated condition; (2) lightload,high velocity and large rheological exponent all help to form thicker lubrication film with a more obvious se-cond pressure peak; and (3) the lubrication between the rolling ball and the rolling cave is actually in an alternatestate of EHL and boundary lubrication.

Key words: automotive wheel hub bearing, elastohydrodynamic lubrication, boundary lubrication, grease lubrica-tion, numerical analysis

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