Common failure modes and countermeasures of rolling bearings

1. Unilateral limit position peeling off of channel


The flaking of the unilateral limit position of the channel is mainly manifested in the serious peeling ring zone at the junction of the channel and the baffle edge. The reason is that the bearing is not installed in place or sudden axial overload during operation.


The countermeasure to be taken is to ensure that the bearing is installed in place or the free-side bearing outer ring is fitted with the clearance fit, so that the bearing can be compensated when the bearing is overloaded. If it is not possible to ensure that the installation is in place, it is possible to increase the oil film thickness of the lubricant (increase the viscosity of the lubricating oil), or to reduce the load of the bearing, etc., to reduce the direct contact of the bearing.


2. Ring fracture


Ring fracture failure is rare, which usually caused by sudden overload. The causes are complex, such as bearing raw material defects (bubble shrinkage), forging defects (overburning), heat treatment defects (overheating), machining defects (local burns or surface microcracks), main engine defects (poor installation, poor lubrication, instantaneous overload) and so on. It is possible to break the ring under overload shock load or severe vibration.


The countermeasures are to avoid overload impact load, select appropriate interference, improve installation accuracy, improve operating conditions and strengthen quality control in bearing manufacturing process.


3. Jam injury


The so-called jam injury is caused by the summary of small burns that caused by the damage on the sliding surface, including the linear scar of a square sentence around a rolling surface, the cycloid scar of the roller end face and the jam injury near the shaft ring surface of the roller end face. The main causes of jam injury are excessive load, excessive preloading, poor lubrication, foreign body bite, tilt of inner ring outer ring, deflection of shaft, poor accuracy of bearing box and so on.


It can be solved by proper preloading, improving lubricant and lubrication method, and improving the accuracy of shaft and bearing box.