1. the pitting corrosion fatigue
Loads of FAG bearing. in rolling contact with inner and outer ring surface contact stress. the inner and outer rings and rolling elements relative rotational movement at work and contact stress for pulsating circulation changes. When the contact stress exceeds the limit value, the subsurface fatigue cracking, and gradually extended to the surface, so that the inner and outer ring raceways rolling surface pitting corrosion fatigue loss of wheel bearing rotation precision, noise, shock and vibration. Pitting is the failure mode of rolling bearing
2. plastic deformation
Speed when wheel bearings little or only swinging, excessive load or impact load makes my eyes bearing raceways and rolling contact when you have more local than the yield limit of material, will have a large plastic deformation, deformation over a certain Fan Tian. bearings will not work properly. Plastic deformation is another FAG bearing failure.
In order to determine whether removing bearings can be used again, to clean the wheel bearing checked, carefully check the Raceway surface, rolling, status of the mating surfaces, cage wear, increased bearing clearance and with or without injury on the dimensional accuracy declined, exceptions. Non-separation-ball bearing, inner ring support level with one hand, rotate the outer ring to confirm fluency.
Diagnosis:
1) engine speed by the idle speed to medium speed when excessive sound clearer, as the speed increases, sound more focused, for the bearing rings.
2) for a cylinder cutoff tests, sound weakens or disappears, the cylinder bearing rings.
3) beep irrespective of the speed and temperature and engine vibration, doing experimental noise cutoff does not change, or ablation of the alloy.