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Bearing fracture defects overload two factors, when the applied load exceeds the material strength limit caused parts breakage called overload fracture defects can also occur in the bearing during operation in of overheating organizations and local burn, causing defects fracture.
From the use of perspective, pay attention to the following points:
1 choice of grease: grease selection is generally selected according to the bearing speed, temperature, noise requirements and starting torque is very understanding of the performance of various fats.
2, bearing seal type choice: bearing lubrication can be divided into oil lubrication and grease lubrication. Oil lubricated bearings are generally chosen form of bearings, grease lubricated bearings generally used in sealing shields or rubber seals. Dust cover suitable for high-temperature or use the good parts of the environment, points of contact seals and non-contact seal two seals, contact seal dustproof performance is good but the starting torque, fit seal starting torque is small, but the sealing performance No-contact is good.
3, the choice of bearing types: bearing type is generally to be selected according to the conditions of use of complementary products and bear the load of the bearing. It is necessary to understand the user's actual load bearing consistent with the selected bearings reach requirements should re-election model, but unless special products on select models generally will not have any problems.
4, the selection of the bearing clearance: buy bearings usually only inform what type, grade, rarely be bearing clearance request, the business must ask clear bearing of use conditions, the bearing speed, temperature, fit tolerances are directly related to the selection of the bearing clearance. General speed of 3500 rev / min motor mostly using CM clearance, such as high-temperature high-speed motor requires a relatively large clearance. Bearing clearance in the assembly because of the narrowing of the large and cylindrical bore up and lead to a reduction in the amount of reduction in clearance =, the interference x 60% (bearing chamber except aluminum). Such as bearings before assembly clearance is 0.01mm, the amount of interference in the assembly of 0.01mm, 0.004mm clearance after the bearing assembly. The theoretically bearing noise and life will achieve the best state in the zero clearance, but taking into account the temperature rise in the actual operation, the bearing clearance after assembly 0.002mm-0.004mm better.
Bearing during operation, and sometimes between the bearing surfaces to squeeze into the inward-hard particles or hard foreign debris or metal surface, this would be the bearing caused by the furrow shape abrasions these hard foreign matter entering through the lubricating medium inside the bearing, With the continuous operation of the bearing, the local friction and heat, could easily lead to local deformation and friction of the friction surface micro-welding phenomenon may even partial melting, and finally cause occlusion phenomenon.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7213C NSK | 65 | 120 | 23 |
| 7213BEA NSK | 65 | 120 | 23 |