INA bearings as the main components of the locomotive, in particular, traction motor, axle bearings, and its function for the safe transport plays an important role in locomotive running on the line, once the bearing failure will result in the entire trains can not run, block the transport of line , in particular, failure of the passenger train, the greater the negative impact, but once the locomotive bearing failure, the repair of locomotives is very difficult, so failure to prevent and reduce the incidence of motorcycle bearing, for the safe transportation of the motorcycle is very important bearing loading can not be hidden before the faulty bearing detected, ensure that qualified parts on the car bearing the focus of this paper is.
 INA Bearing failure                 
   INA bearings serious damage is often not a single cause, but the combined effect of several aspects, harsh operating conditions in a vicious cycle, leading to severe burning of the bearing, so after the accident, is often difficult to determine causes by which, we will formulate relevant measures to bring some difficulties for the discussion, starting with the analysis of several aspects of the cause of bearing failure.
1.1 INA bearings of non-normal wear
   When INA bearings used for some time, the bearing inner ring, rolling elements, cage, outer ring, roller, etc. have some defects, injuries, resulting in poor lubrication of bearings, causing bearing fever, prolonged fever, will lead to: (1) bearing lubricant dilution. (2) To accelerate material fatigue, decrease in hardness. For these reason, further creating a vicious cycle to accelerate the burning heat leaving the bearings. Severe displacement of the bearing inner ring, rolling round loss, shock and heat, finally weld together. Therefore, when running on-line, such as the bearing severe heat, smoke, do not stop, but should keep running to the front of the station, as overheating bearings in the molten state at the moment, once again unable to walk after stopping the cooling, is line blockage.
   Bearing on the locomotive maintenance is very important to the oil, especially the right amount of fuel to the bearings INA bearings ensure good lubrication, in oil and fuel are also likely to cause excessive bearing failure, plus less likely to cause oil lubricated bearings poor heat, adding in overheating are likely to cause mixing, so the maintenance of the oil should be appropriate, while bearing grease cleaning is also very important, once fall into the other impurities in the oil and water, will affect the normal clearance and the establishment of the necessary film.
   Bearings used for too long, bearing life and more than likely to cause material fatigue, leaving with a strong impact on the role of material deformation, making the roller raceway generate spin-off, grind tablets, resulting in poor lubrication and vibration plus large.
1.2 installed on the bearing
   INA Bearings inner ring and shaft clearance does not match the amount of interference, but also easily lead to bearing failure, large amount of interference, it is likely to cause the bearing inner ring due to excessive tensile stress and crack, small amount of interference, is also very likely to cause the bearing inner ring "flaccid."
   Bearing assembly with clearance mismatch, but also easily lead to bearing failure, the small clearance is likely to cause friction roller and raceway heating, as the temperature is rising, the bearing inner ring, rolling elements, cage, outer ring, cover The temperature is not the same, the temperature difference exists between each other, and thus the amount of expansion also slightly different, with the gap will cause a further reduction, plus heat, according to the bearing. The gap is too large, increasing the vibration roller, roller and raceway increase the impact, but also easily lead to uneven distribution of the internal load, roller bearing to reduce the central roller load is too large.
   INA Bearing assembly is not according to process requirements, the impact of bearing with copper hammer, resulting in deformation of the cage, traction motor bearing inner ring is not installed correctly or other reasons axial transverse momentum disappears, causing the bearing shaft die.



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