To ensure that the SKF bearings raceways and small deformation after installation, interference interference fit cannot be made too large, and thermal expansion of high speed centrifugal force and a high temperature, normal pressure or offset surface. Or relaxation of the mating surfaces, interference must therefore consider both factors subject to carefully calculated, normal speed at room temperature effective interference for high speed bearings may not be valid.
High-speed bearing clearance should not only take into consideration the factors referred to above, and to consider the impact of thermal elongation of FAG bearings to clearance, request bearing in working condition, that the clearance work best at a temperature of, and such clearance at the Centre, the outer ball Groove, precisely on the formation of the State. Due to the relative sliding and internal high speed bearings to reduce friction, it is best not to use the inner and outer rings to the relative displacement along an axis method to adjust the bearing clearance.
After the bearing spindle bearing mounted, installed accuracy calibration sequence is as follows:
1, and measurement axis and bearing block hole of size, to determines bearing of tie precision, tie requirements following: within ring and axis take had Ying tie, had Ying volume 0~+4 μ m (in light load, and high precision Shi for 0); outer ring and bearing block hole take clearance tie, clearance volume 0~+6 μ m (but in free end using bearing Shi, also can increases clearance);
2, and fixed end Qian bearing in axis Shang of installed: will NSK bearings with clean of cleaning kerosene for thoroughly cleaning, for fat lubrication, first will contains 3%~5% grease of organic solvent injected bearing for skim cleaning Hou, again with oil gun will quantitative of grease filled into bearing within; heating bearing makes warming 20~30℃, with hydraulic machine will bearing mounted into axis end; will tight will set pressure in axis Shang and to suitable of pressure arrived live bearing end surface makes its axis to positioning;
Timken bearings tightly closed unit is a matter of recent years, past the bearings are open, to protect the bearing oil and dust-proof, tight closure located on a mounted bearing at each end of the axis. As the industry progresses, especially the food industry, popularization of modern machinery and household appliances, require preset compact close facilities, weight reduction to avoid leaks, leak, which revealed the bearings are bearings with tight closure in itself.
According to the existing tightly closed bearing an inferior to the current situation, focus on internal essence was from now on: the first discussion attempts, with sieve elected INA bearings tightly closed tightly closed ring structure and develop the appropriate bearing inner ring grooved structure, purposes of the upgrading of existing bearing tightly closed structure. Tightly closed early so that bearings can catch up with the international advanced level of similar products and, secondly, is joining car industry development, research and development adapted to the Office for extended periods at high temperature 120-180 ℃ high temperature bearings tightly closed; the third is represented by the railway vehicles bearing tapered roller bearings with tightly closed new structures.


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