When two inadequately lubricated surfaces slide against each other under load, material is transferred from one surface to the other. This is known as smearing and the surfaces concerned become scored, with a "torn" appearance. When smearing occurs, the material is generally heated to such temperatures that rehardening takes place. This produces localised stress concentrations that may cause cracking or flaking.
In rolling bearings, sliding primarily occurs at the roller end-guide flange interfaces. Smearing may also arise when the rollers are subjected to severe acceleration on their entry into the load zone. If the bearing rings rotate relative to the shaft or housing, this may also cause smearing in the bore and on the outside surface and ring faces.
In thrust ball bearings, smearing may occur if the load is too light in relation to the speed of rotation
When two inadequately lubricated surfaces slide against each other under load, material is transferred from one surface to the other. This is known as smearing and the surfaces concerned become scored, with a "torn" appearance. When smearing occurs, the material is generally heated to such temperatures that rehardening takes place. This produces localised stress concentrations that may cause cracking or flaking.In rolling bearings, sliding primarily occurs at the roller end-guide flange interfaces. Smearing may also arise when the rollers are subjected to severe acceleration on their entry into the load zone. If the bearing rings rotate relative to the shaft or housing, this may also cause smearing in the bore and on the outside surface and ring faces.In thrust ball bearings, smearing may occur if the load is too light in relation to the speed of rotation
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