Activates simplified calculation of the bearing operating clearance.
The simplified clearance calculation can be selected to reproduce results calculated with this method in previous Workbench versions. The following simplifications are made:
- The interference in the bearing seats resulting from the tolerances and the roughness of the bearing seats is directly deducted from the internal radial clearance. However, in the exact bearing clearance calculation, the widening of the inner ring raceway or the shrinkage of the outer ring raceway is calculated via the pressure in the bearing seats, taking into account the ring thickness.
- Clearance in the bearing seats resulting from the bearing seat tolerances is added directly to the internal radial clearance. These clearances are calculated and shown separately from the internal bearing clearance. In the system calculation, the clearance in the bearing seats is then considered in addition to the bearing deformation as displacement of the shaft in the radial force direction.
- The change to the interference due to different thermal expansion of the shaft, bearing, and housing bore at operating temperature is not considered.
Note:
For pure consideration of the shaft deflection, the result of the simplified clearance calculation is sufficient in most cases. However, if there are clearance fits in the bearing seats, this procedure has the following disadvantages:
- In some cases (e.g., ball bearings and spherical roller bearings) excessive axial clearances are calculated.
- The load distribution in the bearing is imprecise.
For this reason, the simplified clearance calculation should be used for comparison purposes only.