Creeping

Condition

Fitting surfaces are glazed or matted, and sometimes spalled as well.

Cause

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 aluminium, fit may become loose due to the difference of thermal expansion.

Solution

  • Improvement in fit
  • Improvement in machining accuracy of shaft and housing