Bearing life and basic rated dynamic load

In a certain load bearing life, bearing in appeared pitting before the experience of revolution or hours, known as the bearing life.

Rolling bearing's life to revolution (or to a certain speed of work hours) definition: in this life within the bearing, should be in any of its bearing ring or rolling body occurred in the initial fatigue damage (flake or defect). However no matter in laboratory test or in the actual use, can clear see, in the same working conditions, the appearance of the same bearing, actual life is very different. In addition there are several kinds of different definition of the bearing "life", one of the so-called "working life," it said in a bearing damage can reach before the actual life is by the wear and tear, damage does not usually caused by the fatigue, but by wear, corrosion, seal causes such damage.

Due to the accuracy of manufacturing, material uniform degree of difference, even the same material, the same size in the same bearing, in the same working conditions, the use, its lifespan is not the same. If statistical life for one unit, the longest relative life is 4 units, the shortest is 0.1-0.2 units, the longest and shortest of life than for 20-40 times.

To determine the standard of bearing life, the bearing life and reliability of connected.

Rated life the same specifications (type, material, process) of a batch of bearing, in the same working conditions, the use, 90% of the bearing does not produce pitting, experience of revolution or hours called bearing rated life.