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Spherical roller bearing clearance how to choose?
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| Time：2016.11.03 News Sources：Shandong Xinkaite bearing Co.,Ltd. Views：
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Technical staff to remind you from the theoretical clearance minus the bearing installed in the shaft or when the shell due to interference generated by the expansion of the ring volume or shrinkage after the clearance is called "installation clearance."
In the installation clearance on the increase and decrease due to spherical roller bearing internal temperature difference caused by the size of the amount of clearance after the clearance is called "effective clearance."
Spherical roller bearings are equipped with a mechanical load to bear a certain amount of clearance, that is, the effective clearance plus bearing load elastic deformation after the so-called "working clearance."
Technical staff to remind the work of the special clearance when the micro-negative value, the bearing fatigue life of the longest but with the increase of negative clearance fatigue life with a significant decline. Therefore, the choice of bearing clearance, the general working clearance is zero or slightly is appropriate.
In addition, the need to improve the rigidity of the bearing or to reduce noise, the work clearance to take a further negative, and in the bearing temperature rise, the work clearance will have to take a positive value, etc., must also be based on the use of specific conditions .
Spherical roller bearing clearance choice principle:
1, with a tight fit, the larger the temperature difference between inner and outer ring, the need to reduce the friction torque and deep groove ball bearings to withstand greater axial load or need to improve the aligning performance of the occasion, should adopt a large clearance group.
2, when the rotation accuracy is high or need to strictly limit the axial displacement, should adopt the small clearance group.
And Spherical Roller Bearing clearance-related factors:
1, the bearing inner ring with the axis.
2, the bearing outer ring with the shell hole with.
3, the impact of temperature.
Note: The amount of radial clearance reduction with the actual size of the actual interference components, matching shaft diameter, shell hole wall thickness. 1, the actual effective interference (inner ring) should be: △ dy = 2/3 △ d G * △ d for the nominal interference, G * for the interference with the flattening size.
2, the actual effective amount of interference (outer ring) should be: △ Dy = 2/3 △ D G * △ D is the nominal interference, G * for the interference with the flattening size.
3, the resulting heat will lead to internal temperature of the bearing, and then cause the shaft, bearing and bearing parts of the expansion. The clearance may be increased or decreased depending on the material of the shaft and housing, and the temperature shaving between the bearing and the bearing support.
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