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The rigidity of the bearing refers to the elastic deformation between the rolling element and the raceway contact surface under load. The small amount of deformation is called "high rigidity"; the large amount of deformation is called "low rigidity", that is, the rigidity is poor. Under normal circumstances, due to the different contact area, the deformation of the roller bearing under load is smaller than that of the ball bearing, and the former is better in rigidity.
Normal understanding, the greater the rigidity of NSK bearings, the better. Because of the poor bearing rigidity, an excessive amount of deformation will occur between the rolling element and the raceway contact surface, which will increase the bearing friction and reduce the bearing rotation accuracy. For example, under load, the amount of deformation between the rolling elements is large, and the degree of deformation is different, which will cause uneven stress on the bearing, which will cause more serious damage to the bearing.
At present, the bearing steel used for bearing production is mostly: high carbon chromium steel, with good rigidity. Among them, the amount of carbon content will directly affect the rigidity of the bearing, but whether it is high-carbon chromium steel or low-carbon chromium steel, the rigidity of the 45TAC100B bearing must meet the on-line standard. For example, the lowest rigidity standard for bearing materials is 100, and the rigidity of low-carbon chromium steel cannot be lower than this value.
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The radial clearance of spherical roller bearings will change correspondingly under different conditions, so it can be divided into original clearance, assembly clearance and working clearance:
(1) The original clearance refers to the clearance in the free state after the bearing is assembled before being assembled in machinery and equipment. It is determined by the manufacturer's processing and assembly.
(2) The assembly clearance is also called the fit clearance, which is the clearance when the bearing is assembled with the shaft and the bearing seat and has not yet worked. Mainly because of interference assembly, or the inner ring is increased, or the outer ring is reduced, or both, the assembly clearance is smaller than the original clearance.
(3) Working clearance is also called effective clearance, which refers to the actual clearance existing in the bearing after the bearing is assembled in the host machine and the corresponding temperature rise and stable operation are achieved under the corresponding load effect. The working clearance is smaller than the original clearance, but compared with the assembly clearance, it is mainly because the inner ring has the largest temperature rise and the largest thermal expansion during operation, which reduces the bearing clearance. At the same time, it is mainly because of the effect of the load The elastic deformation of the contact between the rolling element and the raceway increases the bearing clearance, which is actually larger or smaller than the assembly clearance, depending on the combined effectiveness of these two factors.
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