Purpose of preload

To improve running accuracy by reducing runout of shaft, as well as to heighten position accuracy in radial and axial directions.
(Bearings for machine tool spindles and measuring instruments)
To improve gear engagement accuracy by increasing bearing rigidity.
(Bearings for automobile final reduction gears)
To reduce smearing by eliminating sliding in irregular rotation, self-rotation, and aroundthe- raceway revolution of rolling elements.
(For high rotation-speed angular contact ball bearings)
To minimize abnormal noise due to vibration or resonance.
(For small electric motor bearings)
To keep rolling elements in the right position relative to the raceway.
(For thrust ball bearings and spherical thrust roller bearings used on horizontal shafts)

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