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Judge NTN fault damage adjustment of angular contact ball bearing preload method

From spalling corrosion, cracks, wear, indentation, and are reflected in the measurement of bearing vibration and vibration damage to bearings NTN bearings are very sensitive, so angle contact ball bearing by using special measuring bearing vibration (frequency Analyzer, etc) size of the measured vibration, frequency cannot be inferred by the exception circumstances. Because of the measured values of bearing different position and conditions of use or the sensor is installed, therefore requires prior analysis and comparison of the measurements of each machine is determined benchmarks.
NTN bearing split, even a slight injury, also is making an abnormal sound and irregular sound, so logging can be resolved using acoustic logging, on rolling of angular contact ball bearings in the operation to check size and sound quality of the sound, play a preventive role in advance.
If using oil holes can directly measure the bearing outer ring temperature, is more appropriate. Under normal circumstances, NTN bearing temperature, depending on the bearing outside the room temperature may speculate. If lubricated, install appropriate, bearing temperature and quick rise, abnormal high temperature, then you must stop, take the necessary preventive measures. Usually, temperature of the bearings as the run began to rise slowly, after 1-2 hours to stabilize. Angular contact ball bearings to normal temperatures due to the heat capacity of the machine, heat dissipation, speed and load to another. When necessary, using thermal sensors can monitor bearing temperatures at any time, and when the temperature exceeds the set value automatic alarm or stop to prevent burning shaft accident.
NTN bearing Assembly fitters assemble and repair work in the basic operation and adjustment of clearance and preload is important part of rolling bearing Assembly. Accurate adjustment of clearance and preload process concepts and Assembly work in the correct application of this technology, is the guarantee of quality of bearing Assembly work.
NTN bearing clearance of means in the case of a ring fixed, another along the radial or axial rings made by the maximum amount of activity, clearance is divided into radial clearance and axial clearance of two. Angular contact ball bearing Assembly, clearance must not be too large, or too small. Clearance is too large to be caused at the same time bear the load and reduce the number of rolling elements, a single rolling loads increase, thereby reducing the running accuracy of bearing, reduce service life clearance is too small will increase friction, heat generated increases, increased wear, can also reduce the service life of the bearing. Therefore, are to strictly control and adjustment during Assembly of the bearing clearance.
Preload is the bearing in the Assembly, to the inner or outer ring of an axial force to remove the bearing clearance, and the roll body deformation of early contact with the inner and outer rings. Preload can increase stiffness and running accuracy of bearing in working condition, subjected to load large bearings with high running accuracy requirements, mostly in the absence of even a small amount of clearance under the interference of the State, in this case you will need to preload the bearings in the Assembly.   Adjustment of clearance and preload is often through external washers for axial displacement of the appropriate method to complete. Technology concept is easy to see from above, through the adjustment of diagonal contact ball bearing clearance, you can increase the carrying capacity of the bearing and running accuracy, improving the service life of the bearing. But at the same time to increase the NTN bearing friction, heat increases, so you adjust the clearance or preload must ensure good lubrication and cooling. If improperly adjusted or poor lubrication, will in turn make the bearing wear, life expectancy. Proper adjustment of the bearing clearance and preload, but also pay attention to the following issues.



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