The reason causing the failure of the bearing, was both

The reason causing the failure of the bearing, it is two point one: fatigue pitting when rolling bearing load, between roller and inner ring and outer ring of contact surface contact stress, because of inside and outside the ring and roller has a relative rotation movement in the process of operation, so the contact stress of pulsating cycle changes. When the contact stress exceeds limit value, the surface fatigue crack, and gradually extends to the surface, make the inner ring and outer ring raceway can form on the surface rolling fatigue pitting rotating precision of the rolling bearing is reduced, cause noise, shock and vibration. So the pitting is the failure of rolling bearing 2: plastic deformation when the rolling bearing rotating speed is very low or only swing, big open load and impact load bearing raceway and rolling contact surface causes larger local exceed the material yield limit, there will be a larger plastic deformation, deformation if the bearing will not be able to work normally so plastic deformation is another form of rolling bearing fault. In order to determine whether to use bearing disassembly, cleaning up after checking the bearing, carefully check the raceway surface, rolling surface, surface state, cage wear, if increase the dimension precision bearing clearance falling damage, abnormal. Integral ball bearing, and then use a hand support level of inner ring, confirm whether smooth rotation rotate the outer ring. Diagnosis: 1) Engine speed from idle to medium speed, when the voice clear, with the increase of speed, sound more evident for bearing ring. 2) Fire experiment was carried out on cylinder, ring weaken or disappear, used for cylinder bearing ring. 3) No matter whether the sound velocity and temperature, engine vibration, do the fire test sound the same, then the ablation for bearing alloy. Bearings, comfortable and durable, )