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Key factors affecting the TIMKEN bearing life for many products of rotating machinery, their service life depends on the key parts of the bearing components in the product's life. "Maintenance-free" bearing not the bearing never damage or failure within a certain amount of time but can not be damaged. Here designers calculate the service life bearings spherical roller bearings is greater than or equal to the overhaul of the mechanical product service life cycles so that bearings can "maintenance-free" replacement with new bearings in mechanical product overhaul can be no maintenance of the used bearings.
Continue to run into use later, TIMKEN bearing vibration and noise began to increase, sometimes abnormal noise, but changes in the vibration increases more slowly, at this time, bearing kurtosis value suddenly reaches a certain value. We believe that the performance for the early failure of the bearing.
First of all, we want to stress is, keep the spherical bearing lubrication and clean is very important. So before we examine bearings, you should clean the bearing surface, and then disassembling bearing parts around. We should pay attention to, is very fragile parts oil seal, and therefore require extra care in inspections and disassembly, not excessive force, so as not to cause damage to parts. Then carefully check the bearing oil seal and its surrounding parts, if already a bad symptoms, be sure to replace the bad oil seals will cause damage to the TIMKEN bearing, bearing cloud caused by the abnormal equipment downtime.
Secondly, we also have to check the bearing lubricant. Lubrication is very important, not only for bearings, bearings for all. But note that spherical roller bearings should not be adding too much grease.
Stained with lubricant on friction between the two means-dots, if the presence of pollutants, are feeling out; or coated with a thin layer of lubricant on the dorsum, and then make the rays.
Using TIMKEN bearings oil lubricated after purging old oil, if possible, should be poured into the fresh oil and let the machine at low speed of rotation for a few minutes. Oil collects residual contaminants as much as possible, and then purging these oils. Note: oil'd filtered before use. The use of grease lubrication of spherical roller bearings when replacing the grease, used by Joe in addition to bearing should be avoid corners with cotton to any of the parts. Fiber because these residues may be between wedge on scroll and causing damage, especially small bearing application of more attention to this issue.
1, selection and control of shaft and housing tolerances: TIMKEN bearings pressed into the bearing should rotate flexible no block. If there are clearly not flexible rotation, then axis dimensions are too big, the tolerance to cut. If the bearing onto the shaft by hand after turning there is a clear "rustle" sense, the tolerances of the shaft may be too large or the roundness of the shaft well. So when you control the shaft and housing tolerances you want to control the roundness, many domestic manufacturers currently control only tolerance, not to control the roundness.
2, bearing Assembly methods: TIMKEN bearings are high-precision products, such as improper Assembly can easily cause damage to the bearing Raceway, cause damage to the bearing. Bearing Assembly should have dedicated mold, cannot be beat at will, force in pressing axis only small circles, pressing circle only large ring bearing. Assembly call for pneumatic or hydraulic, at the time of pressing die outside to level up or down status, such as tilt can cause mechanical damage of bearing Raceway and the bearing rings.
3, assembling foreign object prevention: bearing when mounted to the rotor dynamic balance easily produced when iron filings into the bearing dynamic balancing internal, it is therefore advisable to load dynamic balance before TIMKEN bearings. Some manufacturers for ease of Assembly, Assembly in the bearing room painted with some oil or grease lubrication effects, but in many cases the operator is difficult to control, if oil or grease in the bearing Interior accumulates more easily along the axis of rotation of the bearing into the bearing. Bearing room it is best not to paint oil or grease, such as non-coating is not available to control shall not be bearing Interior accumulates.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| NJ2319ET bearing | 95 | 200 | 67 |
| NJ2318ET NSK | 90 | 190 | 64 |