Analysis of rolling bearing problems of locomotives
Bearings are the main components of locomotives, especially traction motors and axlebox NSK bearings. Their functions play an insignificant effect on safe transportation. When a locomotive runs on the line, once a bearing problem occurs, the entire train will not run, blocking the main line of transportation. In particular, problems with passenger trains have a greater negative impact. Once a locomotive bearing problem occurs, it is very troublesome to repair the locomotive. Therefore, to prevent and reduce the occurrence of locomotive bearing problems, the safe transportation of locomotives is very important. It is important to detect the problematic and dangerous bearings before the bearings are installed, and to ensure that the qualified bearing parts get on the car.
Analysis of bearing problems, abnormal wear of bearings: It is very important to provide oil protection for locomotive bearings. In particular, excessive oiling of the bearings can ensure outstanding smoothness of the bearings. Lack of oil and excessive oiling can also easily constitute bearing problems. Adding less oil simply constitutes poor lubricity and heating of the bearing, and adding more oil simply constitutes mixing overheating. Therefore, the oil should be supplied properly in the protection. The hygiene of the lubricating grease of the bearing is also very important. Once the grease falls into other impurities And moisture will affect the normal clearance and establish the necessary oil film
The service life of the bearing is too long, and the service life of the bearing is simply constituted as the fatigue of the raw material. With the fierce impact effect, the raw material is deformed, causing the roller and raceway surface to peel off and crush, and then constitute poor smoothness and increased vibration. Big.
When the bearing is used for a period of time, certain defects and scars occur in the bearing inner ring, rolling body, cage, outer ring, raceway, etc., which constitute the smoothness of the bearing and cause the bearing to heat up. Long-term heat generation will lead to: The fatigue of the raw materials reduces the hardness. Due to the above reasons, it further constitutes a vicious circle, accelerating overheating and burning the bearing. Severe displacement of the inner ring of the bearing, the roll body is out of round, conflicts and generates heat, and the ends are welded together. Therefore, when running on the line, if you find that the bearing is severely heated and smoke, do not park, but keep running to the front station. Because the overheated bearing is in a melting state at this time, once the parking is cooled, you can no longer walk, blocking the main line . Dilution of bearing lubricating oil.
The influence of the device on the bearing: the bearing assembly cooperation is not correct, and the clearance cooperation is simply a bearing problem. The small clearance is very simple to cause the roller and the raceway to conflict and heat. With the continuous rise of temperature, the inner ring of the bearing, the tumbling body, and the cage The temperature of the outer ring and the end cover are not the same, and there is a temperature difference between each other, so the amount of expansion is slightly different, which constitutes a further reduction in the cooperation gap, and according to the heat generation of the bearing. If the gap is too large, the oscillation of the roller will increase, and the impact of the roller and the raceway will be aggravated. Together, it will easily cause uneven internal load distribution, the load-bearing roller will be reduced, and the center roller will be overloaded.