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(1) When selecting NSK imported bearing models with high load capacity, the price of NSK imported bearings shall be taken into account, or bearings with high load capacity but more expensive shall be used, or ordinary bearings shall be used to prolong their service life. NSK imported bearings with high load capacity are adopted, such as cylindrical roller bearings with convexity, spherical roller
NSK imported bearings with symmetrical rollers, reinforced tapered roller bearings and ball bearings, ball bearings with corrected ball groove bus, or NSK imported bearings of 70000cd series are used to replace deep groove (single row centripetal) ball bearings, These NSK imported bearings with high load capacity may have higher fatigue life due to the improvement of stress distribution or the large number of rolling elements.
In order to select the appropriate size of NSK imported bearing, the working load, speed and operating temperature of NSK imported bearing must be accurately calculated or verified. The load has a great impact on the service life of NSK imported bearings, so although the load is difficult to measure, it should be measured as accurately as possible. When it is difficult to measure the load, the actual power consumed by the motor can be measured, and the power loss along the way can be calculated according to the transmission route and deducted until the NSK imported bearing load is closer to the actual one.
If the calculated or measured load is too large, the expected fatigue life of NSK imported bearings must be reduced by a greater margin, which must be remedied. If the installation position allows, the bearing with a larger size can be selected; If the radial dimension is limited, the wider bearing shall be selected when there is a wider bearing; If wider NSK imported bearings cannot be used, NSK imported bearings with higher load carrying capacity can be used.
The price of NSK imported bearing materials should also be taken into account. Moreover, when vacuum smelting or electroslag remelting steel has to be used, it should be noted that the lubrication conditions must be improved in order to double the expected fatigue life of the bearing. Of course, the cost of selecting bearings made of this kind of high-quality steel is much more expensive than selecting NSK imported bearings with high load capacity. However, for bearings that are difficult to access in machines and are very difficult to assemble and disassemble, or NSK imported bearings used in mining and tunnel operation machinery, it is sometimes necessary to consider using them in the field of extremely difficult maintenance.