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First, the concept is subtracted from the theoretical clearance when the bearing is mounted on the shaft or in the housing due to the interference fit of the ferrule expansion or contraction clearance is called "installation clearance".
The clearance after adding and subtracting the amount of dimensional change due to the internal temperature difference of the bearing is called "effective clearance".
The bearing is installed with mechanical clearance under a certain load, that is, the effective clearance plus the amount of elastic deformation generated by the bearing load is called "working clearance".
When the working clearance is slightly negative, the fatigue life of the bearing is the longest, but the fatigue life decreases with the increase of the negative clearance. Therefore, when selecting the bearing clearance, it is generally appropriate to make the working clearance zero or slightly positive.
In addition, when the rigidity of the bearing needs to be increased or the noise needs to be reduced, the working clearance should be further negative, and when the bearing temperature rises sharply, the working clearance should be further positive, etc., and it must be analyzed in accordance with the conditions of use. .
Second, the selection principle of clearance: 1. Use a tighter fit, the temperature difference between the inner and outer rings is large, the friction torque needs to be reduced, and the deep groove ball bearing needs to bear a large axial load or the need to improve the alignment performance, large clearance should be used group. 2. When the rotation accuracy is high or the axial displacement is strictly limited, a small clearance group should be used.
Third, the factors related to clearance: 1, the inner ring of the bearing and the shaft. 2. The cooperation between the bearing outer ring and the housing hole. 3. Influence of temperature. Note: The radial clearance reduction is related to the actual effective interference amount of the mating parts, the matching shaft diameter, and the wall thickness of the shell hole. 1. Actual effective interference (inner circle) should be. 2. The heat generated will cause the internal temperature of the bearing to rise, which in turn will cause the shaft, bearing housing and bearing parts to expand. The clearance can be increased or decreased, depending on the material of the shaft and housing, and the temperature shaving between the bearing and the bearing support part.
A) Deep Groove Ball bearings' clearance
B) Cylindrical Roller Bearings' Clearance
C) Four rows Cylindrical roller bearings' clearance
D) Spherical Roller Bearings' clearance