For a shaft with both axial and radial forces, angular contact ball bearings seem to be the most popular at present. Because angular contact ball bearings can bear both radial and axial loads. But its ability to bear radial load is not as good as deep groove ball bearings.
The most commonly used bearings for motors are deep groove ball bearings and cylindrical roller bearings. They all belong to radial bearings, which mainly bear radial loads. For deep groove ball bearings, they also have a certain axial bearing capacity, usually the maximum bearing capacity is 1/4 of the radial rated dynamic load.
In the motor, how to select the bearing type depends on the size and direction of the motor load. When the axial load is not particularly large, deep groove ball bearings should be used: when the radial load is so large that deep groove ball bearings cannot meet the needs, cylindrical roller bearings should be used. It is also an effective way to replace angular contact ball bearings with a combination of radial ball bearings and ordinary thrust bearings.
When the axial load increases, so that it is larger than the load capacity of deep groove ball bearings, angular contact ball bearings are selected. If the capacity of angular contact ball bearings is exceeded, other types of bearings should be selected, such as spherical roller bearings, thrust ball bearings, thrust roller bearings, spherical roller thrust bearings, etc.
The above is a matter of principle. When it comes to operation, corresponding calculations are required. What is said to be beyond its capacity range does not mean that the load is greater than that listed in the sample, or less than how much is qualified. The bearing support force should be converted into equivalent load, and then the bearing life should be checked. When it meets the needs, it is qualified.
