The latest SKF bearing extra life theory and formula

Source: Bearing network time: 2013-11-09

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For modern high quality bearings; the nominal or fundamental extra life may be quite different from the actual life of a particular application. In a particular application; the lifespan is different. The impact of factors; including smoothness, degree of contamination, degree of misalignment, correctness of equipment, and environmental factors.
Thus ISO 281:1990/Amd 2:2000 contains a modified life-threshold equation to compensate for the extra extra lifespan. This life-cycle kernel algorithm uses a correction factor; the bearing is smooth, contaminated and the fatigue limit of the data. Accounting.
ISO 281:1990/Amd 2:2000 also allows the bearing manufacturer to recommend an appropriate method; to calculate the available bearing life correction coefficient based on operating conditions. The SKF correction coefficient aSKF uses the concept of fatigue load limit Pu; similarly used for other machines The algorithm of the component. The value of the fatigue load limit is shown in the product list. In addition, the SKF life cycle correction coefficient aSKF also uses the smooth condition (viscosity ratio) and a coefficient Î·c indicating the degree of pollution to reflect the operating conditions in operation.
The equation for SKF extra life is in common with ISO 281:1990/Amd 2:2000 Lnm = a1 aSKF L10 = a1 aSKF (C/P)p
If the speed is stable; the life can use the equation; the hours of operation indicate Lnmh = a1 aSKF 106/(60n) L10
In the meantime, Lnm = SKF extra life (reliability is 100-n1) %, millions to Lnmh = SKF extra life (reliability is 100-n1) %, operating hours L10 = fundamental extra life (reliability is 90) %); million turns a1 = lifespan reliability coefficient aSKF = SKF life number correction coefficient = fundamental extra dynamic load; KN
P = equivalent dynamic load, KN
n = rotation speed; r/min
p = index of the life-calculation equation 3 for ball bearings 10/3 for roller bearings 1) The coefficient n represents the probability of failure, for example: the difference between the necessary reliability and 100%.
In some cases; it is not necessary to transfer millions or hours; it is preferable to use another unit to indicate the bearing life. For example, the bearing life of axle bearings for road and rail vehicles is usually indicated by the number of kilometers traveled.

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