Low noise bearing installation and adjustment

The installation and adjustment of low-noise bearings can also follow the grouping method of long-life bearings, so that the matching interference is relatively uniform, the bearing clearance is also consistent, and it is hoped that the interference will take a smaller value within the possible range to ensure The deformation of the bearing race is small, so that the noise caused by the passage of the rolling elements becomes small.

The clearance has a great relationship to noise. The ideal state is that the clearance value is just zero when the bearing is in the highest temperature state of operation. The method for judging the excessive clearance is that the static state causes the shaft to be axially displaced, and the reciprocating amplitude thereof is large, and large and heavy turbid noise is emitted during operation.

If an annoying and screaming sound is heard during operation, the pre-tightening of the bearing is too large, and the bearing has a large pre-interference, and the pre-tightening degree should be slightly relaxed. If the clearance is too large, the two bearing rings can be slightly offset in the axial direction: the clearance is reduced, the axial rigidity is increased, and the bearing noise can be reduced.

When the rolling element enters the no-load zone, it will slip or make a left and right sway, which will increase the noise and cause wear, while the small clearance and large axial stiffness can eliminate this phenomenon. However, the play should not be too small to avoid excessive temperature and shortened life.

Sometimes due to the large operating temperature range of the main engine, or the large dispersion of the shaft and the seat hole, it is impossible to obtain a proper clearance at a time. In this case, the outer ring of the bearing can be elastically pressurized. Tight method.