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What is the cause of premature shaft failure? How to improve the life of the shaft?

  • Time:2020-04-10
  • From:Unknown
  • Hits:575
The rotating shaft is an important part of modern electronic products. Its main function is to support the mechanical rotating body, reduce the friction coefficient in the process of its movement, and ensure its rotation accuracy. With the increasing demand for the shaft, the shaft's premature failure, short life and other problems perplex every mechanical enthusiast. Today, I would like to share with you the methods and skills to extend the service life of the shaft. Please comment and share your experience below.


What is the cause of premature shaft failure? How to improve the life of the shaft?


Under a certain load, the number of revolutions or hours the shaft experiences before pitting is called shaft life. The shaft within this service life shall have initial fatigue damage on any of its shaft rings or rolling elements. However, in our daily practical use, it can be clearly observed that under the same working conditions, the appearance of the same shaft, the actual life is very different. What causes this? The editor summarizes the following points:


1、 Improper installation (about 16%)


1. When installing, the force is too strong, in which hitting the shaft with a hammer is the biggest damage to the shaft; it is also the main cause of deformation.


2. There is deviation in the installation or not installed in the shaft position, resulting in too small shaft clearance. The inner and outer rings are not in the same rotation center, resulting in the misalignment.


Suggestion: select proper or professional installation tools for shaft, and use special instruments to test after installation.


2、 Pollution (about 14%)


Pollution can also lead to premature damage of the shaft. Pollution refers to sand dust, metal chips, etc. entering the shaft. The main reasons include: opening the shaft package too early before use, resulting in pollution; the working environment is not clean during installation, resulting in pollution; the working environment of the shaft is not clean, working medium pollution, etc.


Suggestion: it is better not to unpack the shaft before use; keep the installation environment clean during installation, clean the shaft to be used; strengthen the sealing device of the shaft.


3、 Poor lubrication (about 50%)


According to the investigation, poor lubrication is one of the main reasons for the premature failure of the shaft. Including not filling lubricant or lubricating oil in time; not filling lubricant or lubricating oil in place; improper selection of lubricant or lubricating oil; incorrect lubrication mode, etc.


Suggestion: choose the right lubricant or lubricating oil and use the right way of filling.


4、 Fatigue (about 34%)


Fatigue failure is a common failure mode of shaft. The common causes of fatigue damage may be: long-term overload operation of the shaft; not timely maintenance; improper maintenance; equipment aging, etc.


Suggestion: select the proper type of shaft and replace the fatigue shaft regularly and timely.

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