The following is an example of how an appropriate bearing can be selected based on the required service life. To determine required service life in actual cases, refer to the selection menu.
1) Initial conditions
Bearing radial load (Fr), bearing axial load (Fa), rotational speed (n), and bearing bore diameter (d)
2) Selection of bearing type
Select a proper type of bearing from among those listed in the Example Bearing Arrangements.
3) Determination of required service life
Determine the required service life of bearings, referring to Table 3-1.
4) Determination of required dynamic load rating
Obtain the required dynamic load rating by means of equation 3-4.
When the axial load is not so large, the rating is provisionally estimated supposing that P equals Fr.
5) Selection of bearing
Select a bearing that meets the dynamic load rating requirement obtained by the above calculation, from those listed in the Bearing Specification Tables.
6) Calculation of bearing rating life
Obtain the dynamic equivalent load based on the radial and axial load factor of the selected bearing, and calculate the rating life of the bearing.
As for applications where loads on the bearing may vary, calculate the mean dynamic equivalent load by means of equation 3-5 , and estimate the rating life based on it.