|2. Selection of bearing based on the service life|
|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
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.