Smearing is a form of adhesive wear which occurs when surfaces slide relative to one another under load in the absence of a lubricating film. Material is transferred between the surfaces and significant frictional heating is generated. In some instances, rehardening occurs leaving the surfaces susceptible to cracking (heat checks).
Insufficient lubricant film – particularly for roller/flange thrust surfaces
- Light loads – skidding can occur as rolling elements reenter a small load zone
- Insufficient shaft or housing fit – bearing creep may result in smearing damage on the bearing mating surfaces
Smearing wear on a tapered bearing roller resulting from insufficient lubrication.
Smearing wear on a tapered bearing cone thrust flange resulting from an insufficient lubricant film.
Smearing wear on a tapered bearing cup resulting from roller skidding.
Smearing damage on a cylindrical roller resulting from slip due to an insufficient radial load.