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  ASSEMBLY CHARACTERISTICS  

STIFFNESS

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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