A comprehensive engineers' reference source for radial ball bearings and thrust ball bearing




Axial stiffness is increased and radial stiffness is diminished for larger radial play (higher ball contact angle).

Axial stiffness of a bearing at a given (axial) preload is:

Axial stiffness of a bearing at a given (axial) preload is:

Axial stiffness (Newton / meter)    =                   
Change in preload force (N) / Corresponding change in displacement (m)     =     Δfa/ Δδ

The stiffness of a preloaded bearing assembly is determined by the inverse slope of the preload vs. displace ment curve for the bearings used (see page 32).

Example: Using displacement vs. preload curve for R168 type bearing shown on page 32, calculate axial stiffness (N/m) at 0.45kg preload for radial play=8 microns.

From graph: Displacement at .45kg preload = 2.61 microns
Displacement at .50kg preload = 2.78 microns

Stiffness (N/m)    =                   0.5 - 0.45                 .  9.81 = 2.88 . 106 N/m
                                             (2.78 - 2.61) . 10-6                   

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