Rotating inner ring and the outer ring of the bearing Raceway surface, due to the rolling elements are rolling contact, thus running track for the dark side, running track at the Raceway surface, does not fall within the exception, which we will load conditions, so when you remove the universal joint bearings, please pay strict attention to and observe the movements of Raceway surface.
If you look closely at the track, you will learn that bear radial loads, bear large axial load, tolerance torque loads, uneven or has an extremely rigid on the bearing box. Can load and check that the bearing is coupled with an unexpected installation error is too great, and hold universal joint bearing clues to the cause of damage.
Lubrication is very important, not only against the bearings, also for all bearings. But please note that the bearing should not add too much grease. And then replace the bearing lubricant. Oil lubricated bearings, after purging the old engine oil, if possible, should be poured into the fresh engine oil and make the machine at low speed spin for a few minutes. Residual oil as much as possible to collect pollutants and diarrhea in addition to these oils. Use grease-lubricated bearings when replacing the grease, used by Joe you should avoid contact with cotton in addition to any part of the bearing. Fiber because these residues may be wedged in between the rolling and cause damage, especially small bearing application should pay attention to this issue.
1, crest factor diagnosis method
Crossing the peak factor defined as the ratio of peak to RMS. It is a dimensionless parameter, it is used for diagnosis of FAG bearings inch advantage is that it is not subject to gimbal bearing, speed and load impact, not under the influence of sense of spirit.
Crest factor for diagnosis of such drop in.
Use: trend detection crest factor changes over time, and General experience. FAG bearings to normal. crest factor of about 3-5; bearings when the injury occurred and development, crest factor significantly increased over 3-5, and possibly 10-15, fault serious, crest factor is back 3
2, diagnosis method of kurtosis
Kurtosis is defined as the normalized-order Central moments. It is also a nondimensional parameter. it is used for diagnosis of FAG bearings advantage is that it is not subject to gimbal bearing effect of geometry size, speed and load. is not subject to influence of sensor sensitivity.
Kurtosis is also suitable for diagnosis of candles in such valleys.
Use: checking kurtosis trends over time, generally experience that, FAG bearings to normal. approximately 3 kurtosis; bearing yan reported injuries and development, kurtosis significantly increased. even reaching dozens of fault when playing peaks due to teach again fall back to around 3.