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How to install low noise bearings?1
The installation and adjustment of low-noise bearings can also follow the grouping method of long-life bearings, so that the fit interference size is more consistent, and the bearing clearance is also more consistent, and it is hoped that the fit interference should take a smaller value within the possible range , in order to ensure that the deformation of the bearing raceway is small, so that the noise caused by the passing of the rolling elements is reduced.
Clearance has a great relationship with noise. The ideal state is that when the bearing is in the highest temperature state of operation, the clearance value is just zero. The methods for judging that the clearance is too large are as follows: in the static state, the shaft is displaced axially, and the reciprocating amplitude is large, and a large and heavy noise is emitted during operation.
If there is a nasty screaming sound during operation, it means that the preload of the bearing is too large, and the bearing has a large pre-interference, and the preload should be slightly loosened. If the clearance is too large, the two bearing rings can be slightly offset relative to each other in the axial direction: it not only reduces the clearance, but also increases the axial rigidity, which can reduce the bearing noise.
The rolling elements will slip or move left and right when entering the unloaded area, which will increase noise and cause wear, and small clearance and large axial stiffness can eliminate this phenomenon. But the clearance can not be too small, so as not to cause excessive temperature and shorten the life.
Sometimes due to the large working temperature range of the main engine, or the large discreteness of the shaft and the seat hole, it is impossible to obtain a more appropriate clearance at one time. The outer ring adopts the elastic constant pressure preload method.
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