Decision bearing length of life of many factors, but can be broadly divided into two types, one is internal (bearing its own factor), the other is external bearings.
SKF bearings main factors including structural design, quality manufacturing processes and materials, such as three factors.
Manufacture of bearings generally through forging, heat treatment, turning, grinding and assembly of multi-channel processing. However, the reasonableness of the processing technology, advanced, will also affect the stability of the bearing life. Which affect the quality of the finished bearing heat treatment and grinding processes normally associated with bearing failure have a more direct relationship.
FAG bearings materials metallurgical quality of early bearing failure was the main factor. As metallurgical techniques (such as bearing steel vacuum degassing, etc.) progress, improve the quality of raw materials. Raw material quality factors in bearing failure analysis in the proportion has decreased significantly, but it is still bearing failure is one of the main factors. Appropriateness of the selection is still bearing failure analysis must be considered.
 (A) a fixed circle to take a small interference fit condition that matches the shape of the surface of both sides are very high precision and a smaller roughness, or cause installation difficulties removal more difficult, in addition, also need to consider the impact of the spindle thermal elongation .
 (2) using the pair of angular contact ball bearing spindle, mostly lighter loads, the amount of interference, such as too large, then the internal axial preload amount will be significantly larger, resulting in adverse effects. Using double row bearing shaft and the bearing spindle, which load is relatively large, so the interference with the relatively larger.
 (3) shaft and housing bore roundness and vertical shoulder block bearing in accordance with the appropriate degree of precision required.
 (4) it is necessary to accurately calculate the rotation of the ferrule with the amount of interference, but also suitable for accurate calculation of the amount of the fixed ring.
Interference amount rotatable collar may also wish to obtain a smaller range. As long as the operating temperature and ensure the effect of thermal expansion, and the maximum speed of the centrifugal force, resulting in a tight fit so as not to creep or sliding surfaces. Fixed ring size according to the work load and bearing size, select small clearance fit or interference fit, too loose or too tight is not conducive to maintaining the original shape exactly.
 (5) TIMKEN bearings operating under conditions such as high speed, and high operating temperatures, special attention should be rotating rings can not be too loose to prevent eccentric, as well as with non-fixed ferrule gap appears to prevent the ferrule deformation under load and excited vibrational



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