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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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