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Cleaning, inspection and installation of motor bearings

Cleaning

  Motor bearings are generally cleaned and refueled after 2000 hours of use. There are two methods for cleaning motor bearings:


  First, hot oil cleaning method

  Motor bearings mainly used for softening oil or rust-proof paste hardening should be immersed in hot oil of 100-200 °C, clamp the motor bearing with pliers, and brush the oil on the motor bearing with a brush. The soft dry oil or anti-rust paste is melted when heated to 100-200 ° C, and is easily washed out from the gap of the motor bearing. Sometimes, as long as the motor bearing is shaken several times in the oil, the oil will flow away from the gap.


  When cleaning the radial spherical motor bearing of the motor, the ball, the bead frame and the inner ring should be laterally turned out from the outer ring and then immersed in the hot oil. The roller of the short cylindrical roller motor should also be cleaned when the bearing is cleaned. The frame, inner ring and outer ring are disengaged.


  When hot oil is cleaned, the temperature of the oil should not exceed 200 °C. If you use an open flame to directly heat, you should take care to prevent the oil from burning. The motor bearings should be hung in the oil pan, and the bottom will cause overheating and reduce the hardness.


  Second, the general cleaning method


  Soak the motor bearing in kerosene for 5-10 minutes, pinch the inner ring with one hand, and rotate the outer ring with the other hand. The dry oil or anti-rust cream on the motor bearing will fall off. Then put the motor bearing into the cleaner kerosene, brush it with a soft brush, wash the oil in the ball and the gap, then put it in the gasoline for 1 time, take it out and put it on clean paper. When cleaning the radial spherical ball motor bearing and the short cylindrical roller motor bearing, the ball, the bead frame, the inner ring and the outer ring should be disconnected and cleaned.


  The cleaning of the motor bearing mounted on the shaft is mainly based on the method of spraying oil or spraying with a grease gun. The oil that is easy to clean is first used with kerosene and then with gasoline; the oil that is difficult to clean is firstly washed with hot oil of 100-200 °C. Wash or pistol, then wash with gasoline. Be careful not to use a sharp tool to scrape hard grease or rust on the motor bearings to avoid damage to the smoothness of the rolling elements and grooved parts of the motor bearings. Clean the motor bearings with a clean cloth.


  Inspection, installation method


  1. Before inspecting the bearing, first remove the old lubricating oil inside and outside the bearing, then clean the inside and outside of the bearing with a brush of gasoline. After cleaning, clean the bristles or cotton wool, and do not leave it in the bearing.


  2. Carefully inspect the bearings after cleaning. The bearings should be clean and clean. There are no overheating, cracks, peeling, and groove impurities. The inner and outer raceways are smooth and the gaps are qualified. If the support frame is loose, the support frame and the bearing sleeve will be rubbed. When replacing the new bearing.


  3. The bearing after inspection should be flexible and free of jamming.


  4. Check that the inner and outer caps of the bearing should be free from wear and wear.


  5. The inner sleeve of the bearing and the shaft should be fastened, otherwise it should be treated.


  6. When assembling a new bearing, apply oil heating or eddy current to heat the bearing. The heating temperature is preferably 90-100 °C. The bearing is placed on the motor shaft at high temperature, and the bearing assembly is in place. The cold state is strictly prohibited. The bearing is hit to avoid damage to the bearing.


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