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INA bearings which uses strong regularity in the process, and repeatability is very good. Normal quality bearings (bearings) when it is used at the beginning, vibration and noise are small, but some scattered spectrum, amplitude is small, probably due to some defects in the manufacturing process, such as Burr on the surface.
Movement after a period of time, to maintain a certain level of vibration and noise, spectrum is single, only Yi、erbei. Very rare more than three times the frequency spectrum, bearing condition is very stable, entered a period of stability.
Continue to run access using late, bearing vibration and noise starts to build, sometimes appear abnormal noise, vibration increases more slowly, however, at this time, bearing kurtosis value suddenly reaches a certain value. In our view, when the bearing is characterized by early failures.
At this point, calls for strict monitoring of the INA bearing, pay close attention to the changes. Thereafter, bearing steep degrees value and began fast declined, and near normal, and vibration and noise began significantly increases, its increased significantly began speed up, dang vibration over vibration standard Shi (as ISO2372 standard), its bearing steep degrees value also began fast increases, dang both over vibration standard, and steep degrees value also over normal value (available steep degrees relative standard) Shi, we think bearing has into late fault produced, needed timely overhaul equipment, replaced bearing.
Bearings demonstrate advanced features to a serious fault most of the time not more than a week, capacity of larger, faster speed, shorter intervals. Therefore, in practical bearings fault diagnosis once advanced features, should be decisive judgment bearing faulty, arrange for repair as soon as possible.
1, the sound of rolling bearing using acoustic measurement for bearings in operation check the size and sound of the rolling sound of, even has a slight peeling of the bearing damage, also is making an abnormal sound and irregular sound, using sound system to be able to tell.
2, INA bearing bearing bearing vibrations is sensitive to damage, such as indentation cracks, wear, corrosion, spalling, are reflected in the bearing vibration measurement, therefore, through the use of special bearing vibration Measurer (frequency Analyzer, etc) measures the size of the vibration, through frequency not infer exceptions to the specific situation. Measured values from bearing conditions of use or the sensor installation location is different and therefore require prior to each machine analysis and comparison of measurement values to be determined criteria.
3, bearing bearings temperature, generally have the bearing outside of room temperature can speculate if oil hole can directly measure the temperature of bearing outer ring, is more appropriate. Usually, INA bearing temperatures slowly rise as the operation began, 1-2 hours to stabilize.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| NNU4924 NTN | 120 | 165 | 45 |
| NNU4922K NTN | 110 | 150 | 40 |