• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2024, Vol. 60 ›› Issue (19): 101-115.doi: 10.3901/JME.2024.19.101

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Evolutionary Analysis of Tooth Cracks in Planetary Gear Systems

LEI Zhen, JIANG Hong, ZHANG Xiangfeng, LI Jun, KONG Yiyi, BAI Yu   

  1. School of Mechanical Engineering, Xinjiang University, Urumqi 830049
  • Received:2023-12-11 Revised:2024-06-26 Online:2024-10-05 Published:2024-11-27

Abstract: In view of the hypothesis of “linear crack instead of curved crack” in planetary gear system crack failure, there are problems of the size of simplified error and uncertainty of confidence interval.Considering the singularity of stress field and displacement field of crack front in the process of crack propagation, the crack propagation path is accurately expressed.A new cantilever beam model with root cracks is established to quantitatively characterize the fault degree of different cracks.The dynamic parametric model of planetary gear with crack fault is established, and the influence of the crack fault on the vibration response and fault characteristics of planetary gear system is analyzed.The results show that the feasibility range of reducing the actual crack to the linear crack is as follows: the first 75% of the whole life cycle of the crack, the simplification error of the linear crack is not more than 6.4%; The response of planetary gear system to the fault with less than 50% crack is weak fault, and the response to the fault with more than 50% crack is strong fault.

Key words: planetary gear, cracks in the tooth root curve, meshing stiffness, vibration response, quantitative analysis

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