NTN bearing regular maintenance should pay attention to matters

     When the NTN bearing equipment is regularly inspected, operated, and the NTN bearing that was removed during the replacement of the peripheral parts is stopped, it is necessary to determine whether the secondary NTN bearing parts can be reused and the operation status is better or worse. It is also necessary to rush to check and record the NTN bearings and appearance that have been removed. In order to clarify and check the remaining amount of the visited lubricant, the NTN bearing should be cleaned well after sampling.
    Secondly, check the raceway surface of the NTN bearing, the condition of the rolling surface and the joint surface, and the damage and abnormal conditions of the truss wear. It is necessary to check the running track of the raceway surface. To determine whether the NTN bearing can be used again, it is necessary to consider the level of damage to the NTN bearing, the mechanical function, the primacy, the operating premise, the inspection cycle, etc.
    If the NTN bearing is found to be damaged or abnormal, please find out the cause of the damage caused by the NTN bearing and formulate countermeasures. In addition, the inspection results, if there are the following defects, NTN bearings can no longer be used, the need to change the new NTN bearings.
    a. The inner and outer rings, the rolling elements, and any one of the trusses are cracked and fragmented.
    b. Any one of the inner and outer rings and the rolling elements are peeled off.
    c. The raceway surface, the ribs, and the rolling elements have significant jamming.
    d. The truss is severely worn or the rivets are loose and fierce.
    e. The raceway surface, rolling elements are rusted and flawed.
    f. There are significant indentations and marks on the rolling surface and the rolling elements.
    g. There is creep on the inner diameter surface of the inner ring or the outer diameter of the outer ring.
    h. Superheated and discolored.
    i. Grease seals NTN bearing seals and dust caps are damaged.

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How to lubricate NTN bearings

NTN bearing is one of the imported bearings. How to properly lubricate NTN bearings during normal operation is also an important part of NTN bearing maintenance and maintenance.
1. The oil bath of NTN bearing is smooth
Smooth oil bath is the most common smoothing method in NTN bearings, suitable for the smoothness of low and medium speed NTN bearings. The NTN bearing is partially immersed in the groove, the smooth oil is brought up by the rotating NTN bearing part, and then flows back to the oil groove oil surface should be slightly lower than the center of the lowest rolling element.
2. Smooth drop of NTN bearing
Smooth drip is suitable for NTN bearing parts that need to be supplied with smooth oil. The amount of oil drops is preferably every 3-8 seconds. Excessive oil quantity will cause NTN bearing temperature to increase.
3. NTN bearing's circulating oil is smooth
The oil is pumped to the NTN bearing component by an oil pump, filtered and cooled by the smooth oil after the NTN bearing. Because the circulating oil can take away a certain amount of heat and cool the NTN bearing, this method is used for NTN bearing components with higher speed.
4. Smooth spray of NTN bearings
The boring shrinking air is mixed with the smooth oil by the sprayer to cause oil mist. In the NTN bearing, the airflow can effectively cool the NTN bearing and avoid the intrusion of impurities. This method is suitable for the smoothness of high speed, low temperature NTN bearing components.
5. Smooth radiation of NTN bearings
The low pressure oil is injected into the NTN bearing through the nozzle by the oil pump, and the oil injected into the NTN bearing flows into the oil groove through the other end of the NTN bearing. When the NTN bearing rotates at a high speed, the rolling elements and the cage also cause airflow around the surrounding air at a relatively high rotational speed. It is difficult to send the smooth oil to the NTN bearing in a single smooth manner, which must be smoothed by low-pressure radiation. The oil is sprayed into the NTN bearing and the position of the nozzle should be placed between the inner ring and the center of the cage.

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