Due to fatigue of metal materials, irregular fragments of bearing raceways and ball surfaces if mixed in grease, it will increase its working noise, the ball is in a sliding state, resulting in increased radial clearance of the bearing, and the allowable diameter of the shaft end Increase the yaw value by 2 to 3 times. The determinants of bearing fatigue include: motor load, speed, air gap, end cap type, material toughness, and grease quality.
If the installation is not centered, not only are there bead marks on the bearing slides, but the ball wear marks are uneven, and deflection will occur. When using a feeler to check the radial clearance on both sides of the bearing, the difference will be large. The reason may be that the outer ring of the bearing was struck directly with an iron hammer; the transmission belt was pulled too tight (gear meshing); the centerlines of the driving and passive wheels were not parallel. When the deflection is greater than 1/1000, it will cause the bearing to run at too high temperature, the slide rails and balls will be severely worn, the rotation of the shaft and the end cap bolt pressing surface will not be perpendicular to the bolt axis.
Correct installation method: Use a steel tube sleeve with a smooth and flat end surface and a thickness almost equal to the thickness of the bearing inner ring, and press the bearing on the correct position of the clean journal. When pressing, the force should be even and not excessive. Then check the radial allowable yaw value of the shaft end according to the different speeds of the motor.