Analysis and detection of locomotive rolling bearing problems

Source: Bearing network time: 2013-10-02

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The bearing is the primary component of the locomotive; especially the traction motor and the axlebox bearing; its function plays an insignificant effect on the safe transportation; when the locomotive runs on the line; once the bearing is in trouble, it will cause the whole train to be inoperable; Especially the passenger trains have serious problems; the negative impact of the composition is even greater; once the locomotive bearing problems occur; the repair of the locomotive is also very simple; therefore, prevent and reduce the occurrence of locomotive bearing problems; the safe transportation of the locomotive is very important Can detect the bearing with danger before the bearing is loaded; ensuring the qualified bearing accessories on the car is the main point of this article. The cause of the bearing and the diagnosis method,
The severe damage of the bearing is often not caused by a single cause; it is inductive effect in several aspects; a vicious cycle occurs under bad operating conditions; the bearing is severely burnt; therefore, after the incident, it is often difficult to discriminate What kind of reason is formed; 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.
1. Abnormal wear of the bearing:
(1) When the bearing is used for a period of time; the bearing inner ring, 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; Invited: 1 bearing smooth oil dilution. 2 speed up the fatigue of raw materials; hardness reduction. Due to the above reasons; and further constitute a vicious circle; accelerate overheating and burn the bearing. Severe bearing inner ring displacement; roll body out of round; Heat; end welding together. Therefore when running on the line; if the bearing is found to be severely hot, smoke; 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 Can't walk again; block the positive line.
(2) 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; It is not smooth and hot; if it is added too much, 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 swimming. Gap and establish the necessary oil film.
(3) The bearing is used for too long; it exceeds the service life of the bearing and simply constitutes the fatigue of the raw material; coupled with the intense impact effect, the material is deformed; the roller and the raceway surface are peeled off and the sheet is crushed; And the oscillation is increased.
2. Influence of the device on the bearing:
(1) The interference gap between the inner ring of the bearing and the shaft is inconsistent; 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 to be cracked due to excessive tensile stress; the interference is over. From the heart of Fiji.
(2) Bearing assembly cooperation gap cooperation is not appropriate; it also constitutes a simple bearing fault; small clearance is very simple to form roller and raceway conflict heat; followed by rising temperature; bearing inner ring, roll body, cage, outer ring The temperature of the end caps 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 of the bearing is added. The gap is too large; the oscillation of the roller is increased. Increase the impact of the roller and the raceway; together, it is easy to form uneven distribution of internal load; load roller reduction; center roller load is too large.
(3) When assembling the bearing, do not follow the process requirements; use the copper hammer to impact the bearing; constitute the deformation of the cage; the traction motor bearing inner and outer ring device is incorrect or other reasons cause the axial traverse amount to disappear; the bearing shaft is squeezed.

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