Title: Study on the transient dynamics of an electric driving system considering the interference fit and thermal expansion effects of tapered roller bearings

Authors: Ming Li; Yufa Zhou; Dong Guo; Chuan Fang; Rao Wenyi

Addresses: School of Vehicle Engineering, Chongqing University of Technology, Banan, Chongqing, 401320, China ' School of Vehicle Engineering, Chongqing University of Technology, Banan, Chongqing, 401320, China ' School of Vehicle Engineering, Chongqing University of Technology, Banan, Chongqing, 401320, China ' School of Vehicle Engineering, Chongqing University of Technology, Banan, Chongqing, 401320, China ' Suzhou Inovance Automotive Co Ltd., Suzhou, Jiangsu, 215104, China

Abstract: The dynamic characteristics of the electric driving system in pure electric vehicles are explored in this paper, with consideration given to the effects of bearing interference fit and thermal expansion. Various factors such as radial stiffness of the bearings, axial stiffness of the bearings, gear mesh stiffness, and backlash were taken into account. A transient dynamic model suitable for transient conditions of electric driving system was established. The model's accuracy has been verified through bench tests. The effects of bearing interference fit and thermal expansion on the dynamic characteristics of the electric driving system under tip in/out conditions were studied. Research shows that under tip in/out conditions, as the interference amount and temperature of the tapered roller bearing increase, the fluctuation amplitude of the motor rotor speed has a downward trend. The amplitude of vibration acceleration fluctuations in the bearing seats of each shaft has been reduced.

Keywords: electric driving system; tip in/out; transient dynamics; bearing interference fit; bearing thermal expansion.

DOI: 10.1504/IJVD.2025.148145

International Journal of Vehicle Design, 2025 Vol.97 No.2/3/4, pp.153 - 173

Received: 30 Jul 2024
Accepted: 10 Jan 2025
Published online: 27 Aug 2025 *

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