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Locomotive rolling bearing fault diagnosis and method  

2013-05-07 10:12:04|  分类: 技术 |  标签: |举报 |字号 订阅

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SKF bearings as the main component of locomotive traction motor, in particular, bearing, its function play a decisive role on the safe transport of locomotive running, online, once the bearing failure, will cause the whole train cannot run, blocking the transportation line, especially the passenger train failures, caused by the negative impact is more large, at the same time, once the locomotive bearing fault occurs, the repair of locomotive is very difficult, so the prevention and reduction of locomotive bearing fault occurs, it is very important for the safe transport of locomotive bearing, can be detected with the front will have the hidden trouble in the shaft, to ensure the bearing fittings qualified is the focus of this paper. The.
Bearing fault
Cause serious damage to the NSK bearings are not a single reason, but in a few aspects under the comprehensive action of vicious spiral, resulting in severe operating conditions, resulting in severe damage of the bearing, so after the accident, it is often difficult to judge is caused by any reason, it will give us to formulate relevant measures to bring certain difficulties for the convenience of discussion, first, to analyze the causes of bearing fault from several aspects.
Abnormal wear of bearings
When TIMKEN bearings use after a period of time, the bearing inner ring, rolling body, cage, outer ring raceway, defects, scars some, bad lubrication of bearings, bearing due to fever, fever, long time will lead to: (1) bearing lubricating oil dilution. (2) accelerate material fatigue, hardness decreased. Due to the above reasons, and further form a vicious spiral, accelerating the overheated bearing burning. The inner ring of the bearing displacement seriously, rolling out of round, collision heat, the final weld together. So when you run online, don't stop if found bearing serious heat, smoke, and should be maintained, run to the front of station, because of overheating bearings in the melt state, once the shutdown cooling and then can't walk, plug the line.
The locomotive bearing oil maintenance is very important, especially to the bearing amount of gas can ensure the bearing has good lubrication, lack of oil and gas are too are very easy to cause the bearing fault, oil and less likely to cause bad bearing lubrication and heat, add also easy to cause the stir over heat, so the maintenance of oil should be appropriate, at the same time grease bearing cleaning is also very important, once the impurities and moisture into the other oils, will affect the normal clearance and the establishment of the oil film must.
Used for a long time INA bearings, more than the service life of the bearing and easily lead to material fatigue, impact and strong and make the material deformation, the roller, the raceway surface peeling, slice, resulting in poor lubrication and vibration increase.
Effect on the bearing installation
Clearance of bearing inner ring and shaft interference does not match, is also very easy to cause the bearing fault, large amount of interference, very easy to cause the KOYO bearings inner ring because of excessive tensile stress and crack, the amount of interference is too small, also very easy to cause the bearing inner ring relaxation.
Bearing assembly clearance is improper, also easy to cause the bearing fault clearance is small, very easy to cause the roller and raceway frictional heating, with the temperature rising, the bearing inner ring, rolling body, cage, outer ring, the cover of the temperature is not the same, there are between the temperature difference, so the expansion is also slightly different, too it caused a further decrease in clearance fit with the heat, according to FAG bearings. The gap is too large, the roller vibration increased, exacerbated the impact roller and raceway, also easy to cause the internal load distribution uneven, reduce the central roller bearing roller, overload.
Assembled bearing is not according to the requirement of process, the impact caused by using a copper bearing, retainer deformation, traction motor bearing inner and outer ring are not properly installed or other reasons that the axial transverse momentum disappeared, causing bearing shaft extrusion die.

本文来源http://www.skf-bearingshops.com/转载请注明

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