Why the bearings are damaged

Update: 19-01-2020

Although a bearing is a small part of the machine, it i […]

Although a bearing is a small part of the machine, it is a precision part, so you need to be careful when using it. Otherwise, even a high-performance bearing, if it is used improperly, will cause the bearing to be damaged. What will be the damage?

Improper use is the main reason for bearing damage. Not only can't achieve the expected performance effect, but also easily damage it. Under certain special operating conditions, the bearing can obtain a longer life than traditional calculations, especially under light load. These special operating conditions are when the rolling surfaces (tracks and rolling elements) are effectively separated by the lubricating oil film and the surface damage caused by contamination is limited. Under ideal conditions, the permanent life of the bearing is also possible.

The life of a rolling bearing is measured by the number of revolutions, or the working time at the speed. Within the life of a bearing, preliminary fatigue damage should occur on any of its bearing rings or rolling elements. However, in the experimental and practical use, the bearings with the same appearance under the same working conditions have different actual life. Why is this? In fact, there are many ways to define the bearing life, and the working life is just one of them. It means that the actual life that a bearing can achieve before being damaged is caused by wear and damage rather than fatigue, but by wear, corrosion, seal damage, etc. Caused by. Of course, only some of the bearings are damaged due to wear in actual use, and most of the bearings are damaged due to other aspects, such as excessively small bearing gaps caused by overload, ineffective sealing, and over-tight fit. These aspects can cause bearing damage and leave special signs of damage.