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The concept of L10 life of rolling bearing
by:Waxing
2020-11-13
The rolling bearing fatigue failure to obey certain discrete distribution.
In such a discrete can fit a certain regularity, it is often said to Webster's distribution.
Usually, due to the bearing's life there are discrete, so people from the probability to choose one or two points on the curve to describe the durability of the bearing, this is two points: (
1)
L10 life, that is, a batch of bearing, the fatigue life can reach 90%.
(
2)
L50 life expectancy, namely a batch of bearing, the fatigue life can reach 50%.
In the general machinery industry, usually use L10 life as a standard of measure.
The reliability of it is 90%.
Is when this value reached 90% of the bearing no fatigue failure.
This is a probability as a result, therefore and specific practical operation of a single bearing life does not perfectly match.
International standard ISO 281:1990 / Amd2:2000 'rolling bearing dynamic load rating and the rated life' of the L10 life is under the provisions of lubrication and environmental test and calculation.
Because of the increase in the quality of modern bearing in some applications, the bearing working life may be much higher than the rating of the basic life.
At the same time, in the bearing in the operation of the specific by lubrication, pollution level, the eccentric load, the influence of factors such as improper installation.
Therefore, ISO281:1990 / Amd2:2000 to add some life correction formula to supplement the shortage of the basic rating life.
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