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Smearing

Smearing

Condition
  • Surface is roughened and tiny particles adhere.
Cause
  • Rolling elements slip in rolling motion and characteristics of lubricant are too poor to prevent slippage.
Solution
  1. Select optimum lubricant and lubrication system capable of forming sound oil film.
  2. Use a lubricant including extreme pressure additive.
  3. Take precautions such as a small radial clearance and pre-load to prevent slippage.

Photo: Inner ring of cylindrical roller bearing

  • Inner ring of cylindrical roller bearing
  • Smearing on raceway surface
  • The cause is slippage of rollers due to foreign objects trapped within.

Photo: Roller of same bearing as that of the inner ring shown in <strong>Photo 1</strong>

  • Roller of same bearing as that of the inner ring shown in Photo 1
  • Smearing on rolling contact surface
  • The cause is slippage of rollers due to foreign objects trapped within.

Photo: Rollers of spherical Thrust roller bearings

  • Rollers of spherical Thrust roller bearings
  • Smearing at middle of rolling contact surfaces
  • The cause is slippage of rollers due to foreign objects trapped within.

Photo: Inner ring of double row tapered roller bearing (RCT bearing)

  • Inner ring of double row tapered roller bearing (RCT bearing)
  • Smearing on raceway surface.