Relationship between lubrication purpose of imported bearings and bearing life

Bearing life is basically divided into fatigue life, service life, wear life, and fault life.
 
1. Fatigue life: The material of the main moving parts of the bearing reaches the limit, resulting in the accumulated time before the bearing fails.
    Rated dynamic load: The load that the bearing can withstand when the service life is 10,000 rpm.
  Equivalent dynamic load: refers to the assumed load in which the actual load of the imported bearing is converted according to the operating conditions for determining the dynamic load.
  2. Service life: It is the above three life-time generalized formula. In theory, it refers to the fatigue life of the bearing. It is the bearing wear life under normal use conditions. When the condition is not normal and the manufacturing has no defects, it represents the fault life. .
  3. Wear life: The cumulative working time of the bearing before the specified limit is increased due to normal wear. At today's bearing industry level, wear life > fatigue life should be used, but in fact traction motors are just the opposite.
   4. Fault life: The failure of the bearing is the accumulated working time before the loss of working capacity.
   Then the bearing lubrication has something to do with the bearing life. Let us know the purpose of bearing lubrication:

  The purpose of bearing lubrication:

    1. Extend fatigue life.
    The rolling fatigue life of imported bearings is prolonged when the rolling contact surface is well lubricated during rotation. This is the biggest benefit of lubricating bearings, which can increase fatigue life and extend bearing life.
  2. Reduce friction and wear.
  In the mutual contact portion of the ferrule, the rolling element and the retainer constituting the bearing, metal contact is prevented, and friction and wear are reduced.
   3. Discharge friction heat, cooling
  The circulation oil supply method or the like can be used to discharge heat generated by friction or heat from the outside to cool. Prevent the bearing from overheating and prevent the lubricant from aging itself.
   4. Other
   Colleagues lubricate their bearings to prevent foreign matter from entering the inside of the bearing or to prevent the bearing from rusting and corroding.

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Several methods to check whether SKF tapered roller bearing grease is reused

Core Tip: If the grease used in SKF tapered roller bearings cannot be used if it is out of date, if it is not noticed, it will cause great damage to SKF tapered roller bearings, so you must learn how to judge the grease.
If the grease used in SKF tapered roller bearings cannot be used, if it is not noticed, it will cause great damage to SKF tapered roller bearings. Therefore, you must learn how to judge whether the grease can be reused.

Oil droplet trace method

Take a clean white filter paper, drop a few drops of oil on the filter paper. After the oil leaks, if there is a black powder on the surface, touch the hand with a feeling of resistance, it means that there are a lot of impurities in the lubricant. Good lubricants are powder-free, dry and smooth by hand, and have yellow marks.

2. Handcuffs

The lubricant is rubbed repeatedly between the thumb and the index finger. The better lubricant feels lubricated, less wear debris, and no friction. If you feel a large friction between the fingers, it means lubrication. There are many impurities in the oil, which can no longer be used. New lubricants should be replaced.
3. Illumination method

On a clear day, use a screwdriver to pick up the oil at a 45-degree angle to the horizontal. In the light of the sun, observe the oil droplets. Under the light, it can be clearly seen that there is no wear debris in the lubricating oil, which can be inherited. If the grinding debris is too much, the lubricating oil should be replaced.

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