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Analysis of the diagnosis method and fault of locomotive rolling bearing
Source: Bearing network time: 2013-04-11
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The severe damage of the bearing fault bearing is often not caused by a single cause; it is summarized in several aspects; the vicious cycle occurs under bad operating conditions; the bearing is severely burnt; therefore, after the incident, it is often difficult Discrimination is made up of what causes; it also brings certain difficulties to the method of drawing up the association; it is convenient for comments; firstly analyzes the causes of bearing problems from several aspects.
The influence of the device on the bearing is not according to the process requirements; the copper hammer is used to impact the bearing; the deformation of the cage is formed; the inner and outer ring device of the traction motor bearing is incorrect or the other causes cause the axial traverse amount to disappear; the bearing shaft is squeezed.
Bearing assembly cooperation gap cooperation is not appropriate; it also constitutes a simple bearing problem; small clearance is very simple to form roller and raceway conflict heat; followed by rising temperature; bearing inner ring, roll body, cage, outer ring, end cover The temperature is not the same; there is a temperature difference between them; therefore, the amount of expansion is also slightly different; it also constitutes a further reduction of the cooperation gap; the heat generated by the bearing is added; the gap is too large; the oscillation of the roller is increased; The impact of the child and the raceway; together, it is easy to form an uneven distribution of internal load; the load roller is cut; the center roller load is too large.
The inner clearance of the bearing inner ring and the shaft is inconsistent with the interference; it is also very simple to constitute a bearing fault; the interference is large; it is very simple to form the inner ring of the bearing due to excessive tensile stress and crack; the interference is over.èŠå²¢å¿ƒè°ŒÎ‘俺诨骸.
Abnormal wear of the bearing When the bearing is used for a period of time; the inner ring of the bearing, the rolling element, the cage, the outer ring, the raceway, etc. must have certain defects and scars; the smoothness of the bearing is formed; the heat of the bearing is incurred; the heat is prolonged Will incur: (1) the dilution of the bearing smooth oil. Therefore, when running on the line; if the bearing is found to be severely heated and smoked; do not park; but should keep running to the front station; because the overheated bearing is in a molten state; Once the parking is cooled, it can no longer walk; block the positive line. Because of the above reasons, it further constitutes a vicious circle; accelerates overheating and burns the bearing. (2) accelerates the fatigue of raw materials; reduces hardness; severe bearing inner ring displacement; The rolling body is out of round; it is in contact with the heat; the end is welded together.
It is very important to protect the oil supply of the locomotive bearings; in particular, the excessive oil supply to the bearing can ensure the bearing has an outstanding smooth effect; the lack of oil and excessive oiling are also very simple to constitute a bearing fault; the oil is less simple and the bearing is not smooth. Fever; if it is added, it will simply constitute mixing and overheating; therefore, it is necessary to give oil in the protection; the hygiene of the smooth grease of the bearing is also very important; once the oil and other impurities and moisture are dropped, it will affect the normal clearance and establishment. There is a necessary oil film.
The bearing is used for a long time; it exceeds the service life of the bearing and simply constitutes the fatigue of the raw material; coupled with the fierce impact effect, the material is deformed; the roller and the raceway surface are peeled off and the film is crushed; then the smoothness and the oscillation are formed. Big.
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