About the bearing parameters?

life
Under a certain load, the number of revolutions or hours the bearing experiences before pitting corrosion is called the bearing life.
The life of a rolling bearing is defined by the number of revolutions (or hours of work at a certain speed): the bearing within this life should have preliminary fatigue damage (flaking or defect) on any of its bearing rings or rolling elements. However, no matter in laboratory test or in actual use, it can be clearly seen that the bearing has the same appearance under the same working conditions, but the actual life is very different. In addition, there are several different definitions of bearing "life", one of which is the so-called "working life", which means that the actual life that a bearing can reach before it is damaged is caused by wear and tear, and damage is usually not caused by fatigue, but Caused by wear, corrosion, seal damage, etc.
In order to determine the standard of bearing life, the bearing life and reliability are linked.
Due to the difference in manufacturing accuracy and material uniformity, even the same batch of bearings of the same material and the same size, used under the same working conditions, will have different life spans. If the statistical life is 1 unit, the longest relative life is 4 units, the shortest is 0.1-0.2 units, and the ratio of the longest to the shortest life is 20-40 times. 90% of the bearings do not produce pitting corrosion, and the number of revolutions or hours experienced is called the bearing rating life[1].
Rated dynamic load
In order to compare the bearing capacity of the bearing against pitting corrosion, when the rated life of the bearing is specified as one million revolutions (106), the maximum load that can be carried is the basic dynamic load rating, denoted by C.
That is to say, under the rated dynamic load C, the reliability of this kind of bearing working for one million revolutions (106) without pitting failure is 90%. The larger the C, the higher the carrying capacity.
For basic dynamic load rating
1. Radial bearing refers to pure radial load
2. Thrust ball bearing refers to pure axial load
3. The radial thrust bearing refers to the radial component that produces pure radial displacement

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