Journal of Failure Analysis and Prevention

, Volume 15, Issue 4, pp 486–490 | Cite as

Investigation on the Looseness of the Worm Connected to the Motor Shaft in a Speed Reducer

  • Jiaxing Zhan
  • Yinuo Yan
  • Jianli Qi
  • Mohammad Fard
Lessons Learned


This article aims at identifying the possible cause of the detachment between a worm and its coupled motor shaft. Investigation includes several characterization techniques such as visual observation, mechanical testing and metallographic examinations. Reasons of the failure are identified as design errors. Design parameters and manufacturing process of worm and motor shaft need to be modified and optimized.


Worm Motor shaft Looseness Speed reducer 



The author thanks the support provided by Hangzhou Ignite Auto Electronic Technology Co., Ltd and Baosteel Engineering and Technology Group Co., Ltd.


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Copyright information

© ASM International 2015

Authors and Affiliations

  • Jiaxing Zhan
    • 1
  • Yinuo Yan
    • 2
  • Jianli Qi
    • 3
  • Mohammad Fard
    • 1
  1. 1.School of Aerospace, Mechanical and Manufacturing EngineeringRMIT UniversityMelbourneAustralia
  2. 2.Baosteel Engineering and Technology Group Co., LtdShanghaiPeople’s Republic of China
  3. 3.Hangzhou Ignite Auto Electronic Technology Co., LtdHangzhouPeople’s Republic of China

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