Research on Fatigue Life Prediction Method of High-speed Ball Bearing of Electric Drive System under Random Load

doi:10.3901/JME.2025.08.214

Abstract

Abstract: In view of the rapid alternation of the output torque and rotational speed of the electric drive system during the driving of new energy vehicles, under the action of high-speed effect and meshing component force, the contact position and contact stress between the bearing rolling element and the inner and outer raceways are constantly changing. Research on fatigue life prediction method of high-speed ball bearing of electric drive system under load. Based on the measured torque and rotational speed of the electric drive system of the pure electric vehicle, the mechanical balance equation is established according to the specific structure of the shaft system and the meshing parameters of the gear system, and the radial, circumferential and axial force time history of the high-speed bearing is obtained by solving it; Centrifugal force and gyroscopic moment effect, construct the position representation function of the contact point between the ball and the inner raceway and the outer raceway in the axial and circumferential direction, and the bearing force balance equation, and combine the Hertz contact theory to construct the deformation coordination equation, and establish the inner and outer bearing. Analytical model of time series stress at any contact point of the raceway; according to the separation condition of the ball and the inner raceway, an iterative initial value constraint strategy is proposed, and the Newton-Raphson method is used to solve iteratively, and the contact stress distribution of the inner and outer raceways under the steady-state boundary conditions is analyzed. Compared with the Romax simulation results, the correctness of the built model and iterative solution is verified; based on the linear accumulation criterion of fatigue damage, the damage of each contact point of the inner and outer raceways under the time-series stress history is traversed and solved, and is equivalent to the bearing inner ring, outer ring and the overall damage can be achieved to predict the contact fatigue life of high-speed ball bearings under random loads. Finally, the effectiveness of this method is verified by bench tests. Therefore, it can provide a reference for the design of high-speed bearings of electric drive systems and life evaluation under complex dynamic conditions.

Key words: random load, high speed ball bearing, time series stress, fatigue damage, life prediction

CLC Number:

U461

ZHAO Lihui, WANG Zhen, LIU Tianyin, LIU Dongjian, WENG Shuo, ZHANG Dongdong. Research on Fatigue Life Prediction Method of High-speed Ball Bearing of Electric Drive System under Random Load[J]. Journal of Mechanical Engineering, 2025, 61(8): 214-227.

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