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Track remedial measures for misalignment of failed bearings

by:JNSN     2021-12-17
Trajectory phenomenon of failed bearing misalignment: For ball bearings, the load trajectory of the stationary ring is not vertical, but inclined in the axial direction, see Figures 38 and 39. For roller bearings, the track on one side of the raceway is clearer than the other side in the inclined state, see Figure 40. Reason: Shaft deflection split bearing seat or vertical bearing seat is misaligned. The two surfaces of the adjacent structure are not perpendicular. There is dirt between the adjacent surface and the bearing ring during installation. The bearing clearance that bears the moment and load at the same time is too large . Remedial measures: Refer to the installation instructions for the allowable inclination, see the catalog to ensure the cleanliness during installation. The bearing clearance should be appropriate. 26 Evaluate the running characteristics and damage of the removed bearing. Rolling contact mode 38: Misalignment of the bearing a: Misalignment of the bearing seat When the inner ring is inclined relative to the outer ring b: When the shaft is deflected, the two inner rings are relatively skewed c: The track of the deep groove ball bearing that rotates when the inner ring is misaligned d: The deep groove ball bearing that the outer ring rotates when the outer ring is misaligned 3.3.2 The dents on the raceway and rolling element surface failure. The rolling contact area of u200bu200bthe bearing components often has dents, and the dents may be caused by a variety of reasons. If these dents are large and evenly distributed, then when analyzing the trajectory (chapter 3.3.1), consider whether it is caused by the cyclic movement of foreign particles in the bearing. The following content is mainly related to the ferrule. Evaluate the running characteristics and damage of the removed bearing. Rolling contact mode 39: Inclined trajectory on the raceway of the inner ring of deep groove ball bearings 40: Inclined trajectory on the raceway of the inner ring of tapered roller bearing 3.3.2.1 When the broken bearing is in cyclic motion, The materials of the raceways and rolling elements are subjected to continuous alternating stress. Therefore, the failure mode is similar to the fatigue of the mating part under bending stress: the expansion of fatigue fracture. In rolling bearings, these fracture areas develop parallel to the surface of the raceway to a large extent and eventually cause surface spalling, which can also be called: fatigue failure, surface spalling, pits, pitting, microscopic pits, and so on.
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