Our long-term production condition monitoring, found in the process of rolling bearings use exhibit strong regularity, and repeatability are very good. Normal high quality imported bearing (rolling bearing) in the beginning when using, vibration and noise are relatively small, but spectrum some messy, amplitude are smaller, may be due to the production process of some defects, such as surface burr, etc..

Sports after period of time, vibration and noise and maintain a certain level, the spectrum is a single, there's only one, two times frequency. Seldom appears more than three times the power frequency spectrum, bearing state very stable, in a stable working period.

Continue to run into the late after use, NTN bearing vibration and noise
began to increase, sometimes appear different sound, but the increase of vibration changes more slowly, at this time, bearing kurtosis value suddenly start up to a certain value. We think, this time the NTN bearing namely the performance for the initial failure.

At this moment, is called the NTN import bearings of strict monitoring and pay close attention to the change. Since then, bearing kurtosis value and start falling fast, and close to normal, and vibration and noise began to increase significantly, the increase rate began to speed up, as the vibration more than vibration standard (such as ISO2372 standard), its bearing kurtosis value also began rapid increases, when the vibration is more than the standard, and kurtosis value is more than normal (or kurtosis relative standard), we think bearing has entered the late in fault, need to timely maintenance equipment, replace the rolling bearing.

NTN bearing fault characteristics to the late show serious fault (usually bearing damage such as holding shaft, burns, sand frame spallation, groove, bead wear etc) time mostly not more than a week, the greater the equipment capacity, the faster the speed, the interval time is shorter. Therefore, in the actual rolling bearing fault diagnosis, once the late found fault characteristic, should firmly judgment bearing fault exist, as arrangements for maintenance.

1, oil bath lubrication
Oil bath lubrication is the most NTN bearing the lubrication method in common, suitable for low, medium speed bearings lubrication. The imported bearing part of the dip in the slot, by rotating bearing parts lubricant with on, and then come back to the oil tank face should be slightly lower than the minimum of the roller center.

2, drops of oil lubrication
Drops of oil lubrication is suitable for the need to supply quantitative lubricating oil to import bearings components NTN, drops of oil amount general every 3-8 seconds a advisable, too much oil amount will cause bearing temperature increased.

3, circulating oil lubrication
Be filtered with oil pump oil conveying to NTN bearing parts, through the bearing of the lubricating oil filter again after cooling after use. Due to circulation oil can take away a certain quantity of heat, make bearing cooling, reason this law is applicable to the high speed bearings components.

4, spray lubrication
The compressed air with dry by spray and lubricating oil mix formation oil mist, jet NTN bearing, the air can effectively make bearing cooling and prevent the impurities invasion. This method is suitable for high speed, high temperature bearing parts lubrication.

5, jet lubrication
With oil pump will be high pressure oil through the nozzle to shoot to bearing, into the oil in the bearing of the bearing the other end into the oil. In bearing high speed rotating, rolling body and maintains a also with very high rotation speed around to air form air, using general lubrication methods, it is hard to lubricating oil to bearing, then must use the method of high pressure jet will lubricating oil spray to bearing, nozzle should be put in the position of the inner circle and maintains a between center!




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