Common bearing wear failures and troubleshooting methods

        In general, if the bearing is used correctly, it can be used until the fatigue life is reached. However, there will be accidents that are prematurely damaged and cannot be used. This early damage, as opposed to fatigue life, is a quality use limit called a fault or accident. Many of them are caused by inadvertent installation, use, and lubrication, and foreign objects intruding from the outside are insufficiently studied for the thermal effects of the shaft and the outer casing.
Regarding the damage state of the bearing, such as the ferrule of the roller bearing and the jam of the rib, it may be considered as a cause of insufficient lubricant, unsuitability, defects in the oil supply structure, intrusion of foreign matter, bearing installation error, shaft deflection If the song is too big, there will be coincidences of these reasons.

Therefore, it is difficult to know the true cause of the damage by only investigating the bearing damage. However, if you know the mechanical use of the bearing, the conditions of use, the structure around the bearing, and the situation before and after the accident, combined with the damage state of the bearing and several reasons, it can prevent similar accidents from happening again.

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18 reasons why the bearing is ringing

    After a long-term summary by the technicians, there are 27 reasons for the bearing to sound. There may be many that we have not encountered before, and will be slowly replenished later.
    1. The bearing is mixed with impurities such as sand or carbon particles to act as an abrasive.
    2. The bearing is mixed with moisture, acid or paint and other dirt, which acts as a corrosive effect;
    3. The clearance of the bearing is too small (the selection is not appropriate);
    4. The lubricating oil or grease type is incorrectly selected;
    5. Insufficient lubrication (oil level is too low, oil or grease leaks through the seal);
    6. The bearing is flattened by the seat hole (the roundness of the seat hole is not good, or the seat hole is not twisted straight);
    7. The horn of the bottom of the bearing housing is not flat (resulting in deformation of the seat hole or even cracks in the bearing housing);
    8. There are debris in the bearing housing hole (residues, dust particles, etc.);
    9. The seal is eccentric (wearing adjacent parts and rubbing);
    10. The bearing is subjected to additional loads (the bearing is axially tightened, or there are two fixed end bearings on one shaft);
    11. The thermal elongation of the shaft is too large (the bearing is subjected to static and indeterminate axial additional load);
    12. The clearance of the bearing is too small, and the rotation is too tight (the tightening sleeve is too tight);
    13. The bearing is noisy (caused by the end face of the roller or the slip of the steel ball);
    14. The bearing and the shaft are too loose (the diameter of the shaft is too small or the adapter sleeve is not tightened);
    15. The shoulder is too large (touching the seal of the bearing and rubbing);
    16. The shoulder of the seat hole is too large (the seal of the bearing is twisted);
    17. The gap of the labyrinth seal is too small (friction with the shaft);
    18. The teeth of the lock washer are bent (wearing the bearing and rubbing);

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How to maintain car bearings?

      Car bearing maintenance instructions summary: car bearing maintenance instructions vehicle rated load range work severe overload directly lead to bearing overload bearing early failure more serious cause of vehicle failure personal safety accidents prohibit bearing abnormal impact load periodic inspection bearing use state observe the bearing Whether the part is abnormal or not, the local temperature rises sharply. It is required to periodically quantify the hydrodynamic bearing.

      Maintenance methods for automotive bearings:

      1. The vehicle should work within the rated load range. If the overload is severe, the bearing will be overloaded directly, which will cause early failure of the bearing. More serious will cause vehicle failure and personal safety accidents;

      2. The bearing is prohibited from being subjected to abnormal impact loads;

      3. Regularly check the use status of the bearing, pay attention to observe whether there is abnormal sound and partial sharp temperature rise in the bearing part;

      4. Regularly or quantitatively add lubricating oil or grease as required;

      5, according to the use of the vehicle, at least once every six months to completely replace the lubricant, and carefully check the bearing;

      6. Inspection under bearing maintenance condition: Clean the bearing under detachment with kerosene or gasoline, carefully observe whether there is sliding or creeping phenomenon on the inner and outer cylindrical surfaces of the bearing, whether the inner and outer raceway surfaces of the bearing are peeling or pitting, and the rolling elements And whether the cage is worn or deformed, etc., according to the comprehensive inspection of the bearing, to determine whether the bearing can continue to use.

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