1, The bearing clearance is inappropriate, the bearings are misaligned, the shaft neck in the bearing in contact with bad, the bearing has unilateral contact or local pressure point, the shaft neck in the operation can not form a good oil film, these factors can cause the vibration of the rotor and bearing wear. When the cause of the failure is identified, the bearing must be replaced or carefully scratched and re-assembled to meet the technical Requirements.
2, cylindrical bearings are not round, multi-oil wedge bearing oil wedge size and shape is not appropriate, bearing clearance is too large or too small, thrust bearing force plate face deflection exceeds the allowable value, tile thickness unevenness of the load distribution on each tile uneven, These factors can cause the bearing surface Babbitt wear. The better treatment method is to use the process axis inspection to repair the irregular shape of the bearing Bush.
3, the rotor due to imbalance, misalignment, oil film oscillation, fluid excitation and other faults produced high amplitude, will make the bearing friction, burning, scratching, nap.
For this reason, it is necessary to eliminate the factors that cause large vibrations and replace worn bearings.
4, Thrust bearing design of the bearing area is too small, compressor overpressure, wheel cover seal, between the seal or between stages seal damage, produced too large axial force, will make tile wear or burn.
5, Insufficient oil supply or interruption, will cause the axle neck and bearing friction, melting and even the shaft and other accidents; oil tank air filter or oil supply system screen is broken, bearing oil supply is not clean, resulting in hole plugging, bearing wear; OIL cooler effect is bad, oil inlet temperature is high, oil viscosity drop, bearing deformation, cause rotor vibration, abrasion bearing; The oil supply pressure is too low, can not establish normal oil film, lubricating oil with water, destroy Oil film, corrosion Journal and Bearing.