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            Description

            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).

            Causes

            • 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 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 cone thrust flange resulting from an insufficient lubricant film.

            Smearing wear on a tapered bearing cup resulting from roller skidding

            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

            Smearing damage on a cylindrical roller resulting from slip due to an insufficient radial load.

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