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Bearing collocation requirements

release time:2018-05-26
Precision bearing coordination requirements:
 
Bearing is an important basic component in machinery and equipment. Not only does it require high performance and precision, but the coordination between bearings is also very important. To ensure that the bearing does not produce excessive deformation after installation, it must:
 
(1) The roundness of the shaft and the seat hole and the perpendicularity of the shoulder should be required according to the corresponding accuracy of the bearing.
 
(2) It is necessary to accurately calculate the interference of the rotating ferrule, and also to accurately calculate the appropriate amount of the fixed ferrule. It is also advisable to obtain a small amount of spinner ring interference in the possible range. As long as the effect of thermal expansion at the working temperature and the influence of the centrifugal force at the highest rotational speed are reliably ensured, the creeping or sliding of the close-fitting surface will not be caused. According to the size of the working load and the size of the bearing, the fixed ferrule selects a slight clearance fit or an interference fit. Too loose or too tight is not conducive to maintaining the original precise shape.
 
(3) If the bearing operates at high speeds and the working temperature is high, special attention should be paid to the fact that the fit of the rotating ferrule should not be too loose to prevent eccentric vibration, and the clearance of the fixed ferrule cannot occur to prevent the ferrule from becoming Deformation under load and excitation vibration.
 
(4) The condition of adopting a small interference fit for the fixed ring is that both mating surfaces have a very high shape accuracy and a small roughness, otherwise it is difficult to install and difficult to disassemble. In addition, the influence of the thermal elongation of the main shaft needs to be considered. .
 
(5) The main shaft of a paired double-angled angular contact ball bearing is used. Most of the load is lighter. If the fitting interference is large, the internal axial preload will be significantly larger, resulting in adverse effects. The use of the double-row short cylindrical roller bearing spindle and the tapered roller bearing spindle, the load is relatively large, so the fit interference is relatively large.