FRICTIONAL PROPERTIES OF GREASE LUBRICATED CONTACT AT DIFFERENT OPERATING REGIMES OF LUBRICATION
DOI:
https://doi.org/10.11113/jtse.v10.198Keywords:
Grease, Friction, Wear, TribologyAbstract
The implementation of electric vehicles introduces new tribological challenges, specifically for bearing systems. Up to 90% of the electric motor rolling bearing is reported to be lubricated by grease. However, the improper selection of grease types can result in premature rupture of the lubricant film due to excessive heat generation during operation. This paper focuses on analysing the frictional behaviour of various commercially available greases intended for use in bearing systems of passenger cars, considering the same mineral base oil with different types of thickener. To study the frictional and wear behaviour, a ball-on-disc friction tester is used to test the selected greases. Experimentally, the studies greases showed similar Stribeck curve trend showing that thickener used in grease plays crucial role in influencing the friction and wear properties. Thus, present study helps to provide knowledge for optimisation of grease for electric motors.
References
Lugt, P. M., 2016. Modern advancements in lubricating grease technology. Tribology International, 97, 467-477.
Lugt, P. M., 2009. A review on grease lubrication in rolling bearings. Tribol. Trans., 52(4), 470-480.
Kanazawa, Y., Sayles, R. S., and Kadiric, A., 2016. Film formation and friction in grease lubricated rolling-sliding non-conformal contacts. Tribol. Int., 109, 505-518.
Willwerth, A., and Roman, M., 2013. Electrical bearing damage – A lurking problem in inverter-driven traction motors. 2013 IEEE Transportation Electrification Conference and Expo: Components, Systems, and Power Electronics - From Technology to Business and Public Policy, ITEC 2013, 1-4.
Romanenko, A., Muetze, A., and Ahola, J., 2016. Effects of Electrostatic Discharges on Bearing Grease Dielectric Strength and Composition. IEEE Transactions on Industry Applications, 52(6), 4832-4842.
Zhu, W. S., and Neng, Y. T., 1988. A theoretical and experimental study of EHL lubricated with grease. Journal of Tribology, 110(1), 38–43.
Cen, H., Lugt, P. M., and Morales-Espejel, G., 2014. On the Film Thickness of Grease-Lubricated Contacts at Low Speeds. Tribology Transactions, 57(4), 668–678.
Farfan-Cabrera, L. I., 2019. Tribology of electric vehicles: A review of critical components, current state and future improvement trends. Tribology International, 138, 473–486.
De Laurentis, N., Kadiric, A., Lugt, P., and Cann, P., 2016. The influence of bearing grease composition on friction in rolling/sliding concentrated contacts. Tribol. Int., 94, 624–632.
Chong, W.W.F., Hamdan, S.H., Wong, K.J. and Yusup, S., 2019. Modelling transitions in regimes of lubrication for rough surface contact. Lubricants, 7(9), p.77.
Lee, C.T., Lee, M.B., Hamdan, S.H., Chong, W.W.F., Chong, C.T., Zhang, H. and Chen, A.W.L., 2022. Trimethylolpropane trioleate as eco-friendly lubricant additive. Engineering Science and Technology, an International Journal, 35, p.101068.
Ariffin, N. A. A. M., Ang, H. H., Hamdan, S. H., Ahmad, H. A. I. A., and Chong, W. W. F., 2022. A numerical algorithm for grease-lubricated point contact at different regimes of lubrication. Jurnal Tribologi, 35, 50-67.
Downloads
Published
How to Cite
Issue
Section
License
Copyright of articles that appear in Journal of Transpot System Engineering (JTSE) belongs exclusively to Penerbit Universiti Teknologi Malaysia (Penerbit UTM Press). This copyright covers the rights to reproduce the article, including reprints, electronic reproductions or any other reproductions of similar nature.
Disclaimer: The views and opinions expressed in the articles are those of the authors and do not necessarily reflect the official policy or position of the JTSE. Examples of analysis performed within are only examples and they should not be utilized in real-world. Assumptions made within the analysis are not reflective of the position of any JTSE entities.
