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In General, if the correct bearing, you can use up to reach fatigue life. But there's a surprise injury prematurely, not in use. This early injury, as opposed to a fatigue life, is called the quality limits of failures or accidents. Due to no attention on the installation, use, lubricate, intrusion of foreign bodies from the outside, axis, the case study on thermal effect of inadequate.
Bearing damage such as: roller bearing rings, ribs hurt, as a reason to consider, insufficient lubricants, are not suitable, for oil drain construction flaws, the intrusion of foreign bodies, bearing misalignment, shaft deflection is too large, there will be these reasons coincide.
1, Assembly foreign object prevention: mount the bearing in rotor dynamic balance is easy to do on dynamic balancing produced when iron filings into the bearing, did before so it's best to be load bearing dynamic balancing. Some manufacturers in order to assemble, Assembly in the Interior bearing coated with some oil or grease lubrication, but often operators are difficult to control, if the oil or grease in the bearing room accumulates more easily along the axis of rotation of the bearing into bearing. The best bearing is not oil or grease, such as non-coating is not available to control shall not be bearing accumulates inside.
2 prevention of rust, paint: paint the rust is characterized by multiple sealed-type motor, motor Assembly has a good voice, but after some time within the warehouse, abnormal sound of motor and remove the bearing with serious rust. Many manufacturers are considered to be before bearing problems, through our advocacy, motor factory has now realized that largely insulated paint problems. The problem mainly because of the acidity of insulating varnishes containing volatile substances under certain temperature and humidity to form corrosive substances, corrosion, which cause bearing damage bearing Raceway. The problem can only be good selection of insulating varnish, and after drying ventilation Assembly over time.
3, selection and control of shaft and housing tolerances: bearing pressed into the bearing should rotate flexible sense of non-blocking. Subject to obvious turn flexible, then the axis dimensions are too large, tolerance to go down. Bearing onto the shaft turn by hand have significant "rustle" sense, the shaft tolerances may be too large or the roundness of the shaft well. So when the control shaft and housing tolerances to control the roundness, there are currently many of them only to control the tolerance, not to control the roundness.
4, bearing of assembling: because the bearings are high-precision products, such as improper Assembly can easily cause damage to the bearing Raceway, causing damage to the bearings. Bearing Assembly should be dedicated mold, are somehow beating, only small forces when pressed into the shaft, pressure ring only ring force. Assembly required when using pneumatic or hydraulic, touched up and down when the pressure outside at the level of State, such as tilt will cause damage to the bearing Raceway due to stress, the bearing rings.
Therefore, only investigated injuries, it is difficult to know the real cause of injury. However, if you know the bearing of used machinery, used condition, bearing around the building, understanding of the situation before and after the accident, combined with several causes bearing damage and visit, you can prevent the occurrence of similar incidents.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7936A5TYNSULP4 NSK | 180 | 250 | 33 |
| 7936CTYNSULP4 NSK | 180 | 250 | 33 |