Bearing configuration has an impact on bearing rigidity. When used in pairs of radial thrust ball bearings or roller bearings, it’s best to have the large ends of the outer rings face each other. The bearings are better able to resist the overturning moment when they are configured in this way. Preload is also less affected by temperature variations.

Improve the rigidity of the shaft support by using the bearing preloading technique. The axial method is used with ball bearings and tapered rollers. While the radial method is used for cylindrical rollers. This can improve the rigidity significantly. At this point, the bearing clearance can be eliminated, or a small amount of negative clearance obtained. When the temperature is not high or the speed is low, the clearance should be reduced to a minimal negative value.

It is recommended to measure the deformation continuously when applying preload. In the low-value deformation stage, deformation increases nonlinearly with preload load, while at the high-value deformation stage, deformation increases linearly with load. As soon as the linear relationship between load and deformation is established, the preload load increase will stop immediately. At this point, a constant stiffness is possible. After that, the relationship between axial rigidity (the stiffness of the bearing) and radial stiffness (the rigidity of its ring) is fixed, regardless of the external load.

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