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Rolling in the course of its use showed a strong regularity and repeatability is very good. Normal quality bearings (bearings) used in the beginning, vibration and noise are relatively small, but some scattered spectrum and amplitude are small, probably due to some flaws in the manufacturing process, such as surface burr due.
Exercise period of time, to maintain a certain level of vibration and noise, the spectrum is very simple, there is only one or two multiplier. Rarely occurs more than three times the frequency spectrum, SKF Bearings state is very stable to stable period.
Continue to run late into the use, bearing vibration and noise begins to increase, sometimes different sound, but the change in vibration increases more slowly this time, bearing kurtosis value starts suddenly reaches a certain value. We believe that the performance of the initial point bearing failure.
At this time, it requires close monitoring of the FAG Bearings, pay close attention to the changes. Since then, bearing kurtosis values began to decline rapidly, and close to normal, while the vibration and noise begins significantly increased, its growth began to accelerate significantly, when the vibration exceeds vibration standards (such as ISO2372 standard), and its bearing kurtosis value starts Rapid increases, when both exceed vibration standards, and kurtosis values than normal (available kurtosis relative standard), we believe that the bearing has entered the late failure of production, the need for timely maintenance equipment, replacement bearings.
Rolling demonstrate advanced fault characteristics to a serious failure (generally axle bearing damage such as burns, sand shelf spallation, raceway, wear beads, etc.) is not more than one week big time, equipment, greater capacity, faster speed, and its The shorter the interval. Therefore, the actual bearing fault diagnosis, once found fault with advanced features, should decisively determine the bearing is faulty, repair as soon as possible.
The original NSK Bearings Bearing clearance is complete after installation on the machine, which in the free state clearance. In fact the original clearance by measuring it is difficult not learned. So that the original clearance clearance inspection is often used instead.
Clearance inspection is the inspection status, measured in applied load conditions, with equipment testing data obtained clearance, strictly speaking with the bearing clearance is not the same as the original, but in general the two readings differ in small, which can substitute each other without much error occurs.
2) Effective clearance
Effective clearance or clearance work is known as the bearing installed in the host, in a certain load, up to a certain temperature under steady state operation, TIMKEN bearings clearance of the practical. Obviously, the effective clearance smaller than the clearance work.
Bearing clearance requirements of the role and
Bearing clearance is to ensure that there is bearing the flexibility to operate without blocking, but also required to ensure the smooth operation of the bearing, the bearing axis no significant settlement, and bear the load as much as possible the number of bodies.
Therefore, INA bearings clearance of the bearing dynamic performance (noise, vibration and friction) and rotation accuracy, long life (wear and fatigue) the carrying capacity has a significant impact.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7913C NSK | 65 | 90 | 13 |
| 7913A5 NSK | 65 | 90 | 13 |