Bearing life

Under certain load, the number of revolutions or hours before the experience of bearing pitting in the event, called the bearing life.
Life of rolling bearings of the number of revolutions (or in hours of work under a certain speed) Definition: In this life bearing within, High Speed Backing Bearing initial fatigue damage should occur (spalling or defect) on any of its rings or rolling element bearings. However, both in laboratory tests or in actual use, we can clearly see, the appearance in the same working conditions of the same bearing, the actual life different. There are also several different definitions of bearings "life", one of the so-called "working life", which represents the actual life of a bearing can be achieved before the damage is usually not damaged by the wear caused by fatigue, but It is caused by wear and tear, corrosion, seal damage and other reasons.
To determine the standard bearing life, the bearing life and reliability linked.
Due to manufacturing precision, uniformity of material differences, even if the same material, the same group of the same size bearings, used under the same working conditions, their life is not the same length. In terms of the statistical life of a unit, relative to the longest life is 4 units, the shortest 0.1-0.2 units, the ratio of the longest and the shortest life of 20-40 times. 90% of the bearing does not produce pitting, the number of revolutions or the number of hours after which called bearing rating life.