Low noise FAG bearing selection

   (1) Dynamic FAG bearing with low noise requirements
    In the FAG bearing produced in China, the department has a low-noise variety of FAG bearings for FAG bearings and FAG bearings. Among them, the ball FAG bearing has several varieties with Zl, Z2 and Z3 suffixes from the inner diameter φ2.5mm to φ60mm, which respectively correspond to three different low noise requirements, and the roller FAG bearing has eight types from N309 to N322. Models are also available in low noise scales.
    These FAG bearings can be used in other machines with low noise requirements and are inexpensive, as is the type and size of the two types of low noise FAG bearings.
    (2) FAG bearings with relatively small noise
    When the above two types of low noise FAG bearings cannot be used, FAG bearings with relatively low noise can be used. The detailed comparison is based on the following:
    1) The noise of the ball FAG bearing is lower than that of the roller bearing, and the (friction) noise of the FAG bearing with less relative sliding is lower than that of the FAG bearing with relatively relatively sliding;
    2) The noise of the FAG bearing using the solid cage is relatively lower than that of the FAG bearing using the stamped cage; the noise of the FAG bearing using the plastic cage is lower than that of the FAG bearing using the above two cages; Thick, less noisy,
    3) FAG bearings with high precision, especially FAG bearings with higher precision of moving body, have lower noise than low-precision FAG bearings.
    4) The noise of small FAG bearings is relatively small compared to that of large FAG bearings.
    For example, the noise of a radial ball bearing is smaller than that of a short cylindrical roller bearing, and the noise of a short cylindrical roller bearing is smaller than that of a tapered roller bearing.

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Notes on regular maintenance of NTN bearings

      When inspecting NTN bearing equipment for regular inspection, operation, and removal of NTN bearings during replacement of external parts, it is necessary to determine in turn whether secondary NTN bearing parts can be reused and recorded better or worse. It is also necessary to carefully investigate and record the NTN bearings and appearance that have been removed. In order to clarify and investigate the remaining amount of lubricant, after sampling, it is necessary to clean the NTN bearing well.
Next, check the raceway surface of the NTN bearing, the condition of the rolling surface and the mating surface, and the wear state of the cage, etc., for damage and abnormality, especially to observe the running track of the raceway surface. To determine whether the NTN bearing can be used again, it is necessary to consider the degree of damage to the NTN bearing, machine performance, importance, operating conditions, inspection cycle, etc.
If the NTN bearing is found to be damaged or abnormal, please find out the cause according to the NTN bearing damage and formulate countermeasures. In addition, the inspection results, if there are the following defects, NTN bearings can no longer be used, need to replace the new NTN bearings.
a. Cracks and fragments appear in any of the inner and outer rings, rolling elements, and cages.
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 cage is worn out or the rivets are loose.
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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