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Roller Bearing Edge and Roller End Damage and Adhesion
Jan 07, 2019

Assessment of rolling bearing shield contact Figure 78 shows a functioning shield surface. 3.4.1 Edge and end surface damage of roller bearings 3.4.1.1 Scratches caused by external particles: Arc-shaped scratches on the side surface and roller end surface (especially in tapered roller bearings), see figs. 79 and 80. The scratch depth in the shield area is related to the contour radius of the large end face of the rolling body embedded with external particles. External hard particles in the lubricant enter the contact area between the end face of the roller and the retaining edge. Remedy: Improve lubricant cleanliness.

Assess the operating characteristics and damage condition of the removed bearing model. Edge contact 79: 80: scratch on the end face of tapered roller due to external particles on the edge; Adhesion on the end face of tapered roller; partial or large area of weld and deep scratch on the contact area between the end face of tapered roller and the end face of the retainer. See figs. 81 and 82. There is also lubricant coking in this area. Often associated with excessive load. Reasons: - insufficient lubrication at high loads and speeds (too little lubrication dose or too low working viscosity) - insufficient lubrication at high loads and low speeds, inelastic hydrodynamic lubrication film between roller ends and flanges - too high preload of tapered roller bearings - overload caused by thermal expansion - such as due to raceway wear, ring tilt or inadequate adjustment Roller inclination, see Figure 81 - Cylindrical roller bearing axial load is too high - because the inclination of the mating surface makes the inner ring axial load too high. Remedial measures: - Improve lubrication (increase viscosity, EP additive, increase lubrication dose) - ensure correct adjustment of bearings.