The reasons for the noise of ball bearings are more complicated. One is the wear of the bearing inner and outer ring mating surfaces. Due to this wear, the cooperation relationship between the bearing and the housing, the bearing and the shaft is destroyed, resulting in the axis deviating from the correct position, and an abnormal noise is generated when the shaft is moving at high speed. When the bearing is fatigued, the surface metal peels off, which will also increase the radial clearance of the bearing and produce abnormal noise. In addition, insufficient lubrication of the bearings, the formation of dry friction, and broken bearings will produce abnormal sounds. After the bearings are worn and loose, the cage will be loose and damaged, and abnormal noise will also occur.
Ball bearings are usually mounted using auxiliary sleeves. At this time, the auxiliary roller or auxiliary sleeve supports the needle to prevent the needle from falling out, and the journal raises the needle with its own chamfer. As the ball bearing moves slowly inward on the journal, the auxiliary roller or The auxiliary sleeve is slowly withdrawn until it is installed in the working position. The outer diameter of the auxiliary roller and auxiliary sleeve should be 0.1-0.3mm smaller than the shaft diameter. When the bearing is installed, first coat the inner surface of the bearing outer ring with grease, and place the needle against the inner surface (there should be a gap when putting the last needle), and then replace the auxiliary of the journal or bearing inner ring The roller or auxiliary sleeve is pushed into the hole of the outer ring, and its end face is aligned with the end face of the mounting shaft or the end face of the bearing inner ring that has been installed on the shaft, and then it is pressed with a press or a hammer to apply pressure.