Bearing parameters

Published:

2023-09-08

The number of revolutions or hours that a bearing experiences before pitting occurs under a certain load is called the bearing life.

Bearing parameters
Life
The number of revolutions or hours that a bearing experiences before pitting occurs under a certain load is called the bearing life.
The life of a rolling bearing is defined in terms of revolutions (or hours of operation at a given speed): within this life, the bearing should experience initial fatigue damage (spalling or chipping) on any of its rings or rolling elements. However, whether in the laboratory test or in actual use, can be clearly seen, in the same working conditions of the 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 the so-called "working life", which indicates that the actual life of a bearing can be achieved before the damage is caused by wear, damage is usually not caused by fatigue, but by wear, corrosion, sealing Damage is usually not caused by fatigue, but by wear, corrosion, seal damage, etc.
In order to determine the criteria for bearing life, the bearing life is linked to reliability.
Due to manufacturing precision, material uniformity differences, even if the same material, the same size of the same batch of bearings, used in the same working conditions, the length of its life is not the same. If the statistical life of 1 unit, the longest relative life of 4 units, the shortest 0.1-0.2 units, the longest and shortest life ratio of 20-40 times. 90% of the bearings do not produce pitting corrosion, the number of revolutions or hours experienced is called the rated life of the bearing [1] .
Dynamic load rating
For the purpose of comparing the load carrying capacity of bearings against pitting, it is stipulated that when the rated life of a bearing is one million revolutions (106), the maximum load it can withstand is the basic dynamic load rating, which is expressed as C. In other words, the bearing is rated at a dynamic load of 1.5 million revolutions (106).
That is, the bearing in the rated dynamic load C role, this bearing work a million revolutions (106) without pitting failure of the reliability of 90%, the larger the C bearing capacity is higher.
For the basic dynamic load rating
1. Radial bearings are pure radial loads
2. Thrust ball bearings refer to pure axial loads.
3. centripetal thrust bearing is to produce pure radial displacement radial component

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Bearing industry overview

Bearing industry status quo

Bearing industry overview

Bearing industry status quo