• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2021, Vol. 57 ›› Issue (10): 77-86.doi: 10.3901/JME.2021.10.077

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Research on Prediction Method of Hub-bearing Service Life under Random Road Load

ZHAO Lihui1,2,3, LI Qichen1, FENG Jinzhi1,2,3, ZHENG Songlin1,2,3, LIU Xinrong4   

  1. 1. School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093;
    2. CMIF Key Laboratory for Strength and Reliability Evaluation of Automotive Structures, Shanghai 200093;
    3. Public Technology Platform for Reliability Evaluation of New Energy Vehicles in Shanghai, Shanghai 200093;
    4. YIHE Axle Co., Ltd., Zhucheng 262229
  • Received:2020-08-03 Revised:2021-03-19 Online:2021-05-20 Published:2021-07-23

Abstract: Currently, bearing life evaluation is mainly based on fixed load conditions, and the dynamic coupling effects of radial force, axial force and bending moment are less considered, which leads to the great difference between the actual service life and the theoretical life of bearings. Therefore, a service life prediction method for hub bearings under random road loads is proposed. Based on the measured wheel load on proving ground, the correlation ship between loads in different directions are determined through joint distribution and the number of cycles which strongly affect the damage of the load are derived. According to the deformation coordination relationship between roller and raceway of bearing and considering the influence of the roller angular displacement and the misalignment of the raceway on load transfer under bending moment, a model to calculate the instantaneous contact load of each component of bearing is established. Combined with the joint distribution counting results of multi-axial loads and the calculation model of contact loads, the circumferential contact load sequence is obtained by using the Newton-Raphson iterative algorithm, and it is compared with the simulation results of Romax to verify the validity of the results. The multi-axial load equivalent dynamic load of the bearing is obtained according to the modified L-P theory. Combined with the joint distribution counting results and the linear damage accumulation criterion, the fatigue life of hub bearing under the random road load can be calculated. To validate the proposed method, bench tests are conducted and results show good agreement between calculated and experiments. This method provides a useful tool for the design, selection and life prediction of hub bearings.

Key words: random load, hub-bearing, compatibility of deformation, equivalent dynamic load, life prediction

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