The number of turns or hours that the bearing undergoes before pitting is called the bearing life under a certain load.
The life of the rolling bearing is defined by the number of revolutions (or the number of hours worked at a certain speed): bearings within this life span shall have initial fatigue damage (spalling or defect) on any of their bearing rings or rolling bodies. However, whether in the laboratory test or in practical use, it is obvious that under the same working conditions of the same appearance of the same bearing, the actual life is very different. In addition, there are several different definitions of bearing "life", one of which is called "Working Life", which indicates that a certain bearing before the damage can be achieved by the actual life is worn, damage is usually not caused by fatigue, but by wear, corrosion, seal damage and other causes.
To determine the standard of bearing life, the bearing life and reliability are linked.
Due to the manufacturing accuracy, the uniformity of the material differences, even the same material, the same size of the same bearing, under the same working conditions, the length of life is not the same. If the statistical life of 1 units, the longest relative life of 4 units, the shortest 0.1-0.2 units, the longest and shortest life ratio is 20-40 times. 90% of the bearings do not produce pitting, the number of cycles experienced or the number of hours known as the bearing rating life.
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