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Traction behaviours of aviation lubricating oil and the effects on the dynamic and thermal characteristics of high-speed ball bearings

Zhen Li (MIIT Key Laboratory of Aerospace Bearing Technology and Equipment, Harbin Institute of Technology, Harbin, China and Gear Research Centre (FZG), Technical University of Munich, Munich, Germany)
Yufan Lu (MIIT Key Laboratory of Aerospace Bearing Technology and Equipment, Harbin Institute of Technology, Harbin, China)
Chi Zhang (Gree Electric Appliances, Zhuhai, China)
Jinlong Dong (BYD Co Ltd, Shenzhen, China)
Xiaoli Zhao (MIIT Key Laboratory of Aerospace Bearing Technology and Equipment, Harbin Institute of Technology, Harbin, China)
Liqin Wang (MIIT Key Laboratory of Aerospace Bearing Technology and Equipment, Harbin Institute of Technology, Harbin, China and State Key Laboratory of Robotics and Systems, Harbin Institute of Technology, Harbin, China)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Publication date: 22 August 2019

Abstract

Purpose

The traction behaviours of lubricating oil significantly affect the stability and lubrication regime of aviation high-speed ball bearings. Rolling elements will slide at a low traction force (TF). Therefore, traction behaviours need to be studied, and a fitting expression for traction curves to rapidly calculate the traction coefficient (TC) should be developed.

Design/methodology/approach

The traction behaviours of an aviation lubricating oil were studied in severe operating conditions with a self-designed two-disc testing rig. Based on the least squares method and the Levenberg–Marquardt theory, a rapid calculation expression was developed by fitting the obtained traction curves. The correction of this expression was experimentally verified by comparing the TCs under different operating conditions. This expression was also used to modify the commonly accepted quasi-dynamic model of rolling bearings.

Findings

An increase of the load led to an increase in the TC. In comparison, the temperature and entrainment speed showed inverse effects. The proposed expression exactly predicted the trend of the experimentally acquired traction curve. The calculation with the modified dynamic model showed that the action of the TF on a single rolling element varied and that the temperature increase of the outer raceway is higher than the inner raceway, which is caused by the TF and relative sliding speed between the elements and raceways.

Originality/value

The proposed fitting expression is able to simplify the TC calculation of synthetic aviation lubricating oil in practical engineering applications. This paper can provide an important reference for the traction behaviour of synthetic aviation lubricating oil under severe conditions and assist with its rapid calculation and practical application in engineering.

Keywords

Acknowledgements

The authors want to thank the National Key Research and Development Programme (2018YFB0703804) and the National Natural Science Foundation of China (U1637206).

Citation

Li, Z., Lu, Y., Zhang, C., Dong, J., Zhao, X. and Wang, L. (2019), "Traction behaviours of aviation lubricating oil and the effects on the dynamic and thermal characteristics of high-speed ball bearings", Industrial Lubrication and Tribology, Vol. 72 No. 1, pp. 15-23. https://doi.org/10.1108/ILT-01-2019-0015

Publisher

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Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited