Title: Analysis and verification of splash lubrication for electric vehicle gearbox

Authors: Zhang Qingyong; Fan Zhen; Jiang Mingjun; Chen Shanyou

Addresses: School of Mechanical and Automotive Engineering, Fujian University of Technology, Fuzhou, 350118, China ' School of Mechanical and Automotive Engineering, Fujian University of Technology, Fuzhou, 350118, China ' School of Mechanical and Automotive Engineering, Fujian University of Technology, Fuzhou, 350118, China ' School of Mechanical and Automotive Engineering, Fujian University of Technology, Fuzhou, 350118, China

Abstract: In order to analyse the splash lubrication characteristics of electric vehicle gearbox, a numerical simulation model of the gearbox splash lubrication was established based on the computational fluid dynamics method, and the gear surface scaling method was proposed to process the gearbox gear. The heat flow field and oil churning loss of gear splash lubrication under different working conditions were obtained. The influence of gear speed and oil immersion depth on splash lubrication was studied. Finally, the temperature rise simulation results are compared with the test results. Results show that gear oil stirring power loss is positively correlated with speed and oil immersion depth; temperature rise is positively correlated with speed; the influence of speed on the heat flow field and oil stirring loss is much greater than the oil immersion depth; the maximum error between the simulation results and the theoretical and experimental results is only 8.51%.

Keywords: splash lubrication; tooth surface scaling method; temperature field; flow field; churning loss; lubrication effect; gear transmission; volume fraction; dimensional analysis; CFD simulation.

DOI: 10.1504/IJHVS.2022.129788

International Journal of Heavy Vehicle Systems, 2022 Vol.29 No.6, pp.627 - 646

Received: 26 Jan 2022
Accepted: 21 May 2022
Published online: 27 Mar 2023 *

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