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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