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Creeping

Creeping

Condition Cause Solution
  • Fitting surfaces are glazed or matted, and sometimes spalled as well.
  • Fitting of inner ring is loose on inner ring drive bearing, and that of the outer ring is loose on outer ring drive bearing.
  • If the housing is made of a light alloy such as aluminum, fit may become loose due to the difference of thermal expansion.
  1. Improvement in fit
  2. Improvement in machining accuracy of shaft and housing

Photo: Inner ring of deep groove ball bearing

  • Inner ring of deep groove ball bearing
  • Bore wall glazed by creep

Photo: Inner ring of tapered roller bearing

  • Inner ring of tapered roller bearing
  • Spalling due to creep at the middle of bore wall

Photo: Inner ring of thrust ball bearing

  • Inner ring of thrust ball bearing
  • Spalling and friction cracking due to creep on bore wall.

Photo: Inner ring of tapered roller bearing

  • Inner ring of tapered roller bearing
  • Spalling and friction cracking on width surface due to creep crack developed into a split reaching bore wall.