Rolling bearing fatigue due to incorrect installation

Fatigue dimples in rolling bearings due to excessive static loads are similar to dimples caused by foreign particles, and their raised edges can lead to failure. Phenomenon: In the initial stage, the pits distributed with the rolling element spacing are often only distributed on part of the circumference, which eventually leads to the appearance of cracks. This sometimes happens with only one ferrule. Often asymmetrical to the center of the raceway. Cause: Excessive static load, shock loads transmit mounting forces through the rolling elements Remedy: Follow the installation guide to avoid overloads and excessive shock loads Fatigue due to incorrect mounting: For angular contact ball bearings, close the There is fatigue in the non-contact area at the small rib, see Figure 46. Causes: Improper adjustment, insufficient axial contact or insufficient radial interference of the locking bolts Remedial measures: Ensure the rigidity and correct installation of surrounding components Fatigue caused by misalignment: The track deviates from the bearing center, see Figure 40 during rolling Fatigue on track/rolling element edges, see Fig. 47 Circumferential grooves caused by plastic deformation on the whole or part of the surface, so the edges are smooth. In extreme cases, there will be cracks in the bottom of the groove, see Figure 48. Cause: Due to misalignment of the housing or deflection of the shaft, the inner ring is tilted relative to the outer ring and causes large moment loads. For ball bearings, this results in forces in the cage pockets (section 3.5.4), more sliding on the raceways and the balls running on the edges of the raceways. For roller bearings, the raceway is asymmetrically loaded. When the ring is seriously inclined, the edge of the raceway and the rolling elements will bear the load, and stress concentration will occur. See Misalignment Tracks in Section 3.3.1.2. Remedy: Use self-aligning bearings Reduce misalignment Increase shaft strength 31 Evaluate running characteristics and damage on removed bearings Rolling contact mode 47: Fatigue at raceway edges of tapered roller bearings with local overload due to misalignment. 48: Fatigue occurs at the edge of the ball bearing raceway, such as with high moment loads (edge u200bu200brunning); the left picture shows the edge of the raceway, and the right picture shows the ball.