Calculation of Dynamic and Static Loads for Deep Groove Ball Bearings According to ISO Standards

The dynamic load of a deep groove ball bearing includes the basic rated dynamic load and equivalent dynamic load, while the static load includes the basic rated static load and equivalent static load. The calculation is based on ISO 281 (for dynamic load-related content) and ISO 76 (for static load-related content). The specific formulas and calculation steps are as follows:

Basic Rated Dynamic Load (Cr)

The basic rated dynamic load refers to the constant radial load that a deep groove ball bearing can withstand for 10^6
 revolutions with a 90% reliability rate. The calculation formula is divided into two cases according to the diameter of the steel ball:

Equivalent Dynamic Load (
Pr)

This load converts the actual combined radial and axial loads into an equivalent radial load, which is used for deep groove ball bearing life calculation. The calculation needs to be judged by combining the load ratio:

Basic Rated Static Load (
​Cor)

ISO 76 standard stipulates that it is based on the allowable permanent deformation (about 0.0001 times the steel ball diameter) generated at the contact between the rolling elements and the raceway. The specific calculation is as follows: