When repairing a DC motor, the maintenance personnel must align the tolerance of the bearing outer ring with the end cover. The preload bears the lower limit of the tolerance range and does not want to reach the upper limit, which reduces the diameter of the bearing chamber and increases the friction with the outer ring of the bearing.
What are the reasons for the excessive tightness of the DC motor bearings?
The bearings of the DC motor should not be too tight, so do you really understand the reason that the bearings of the DC motor are too tight? When repairing a DC motor, the maintenance personnel must align the tolerance of the bearing outer ring with the end cover. The preload bears the lower limit of the tolerance range and does not want to reach the upper limit, which reduces the diameter of the bearing chamber and increases the friction with the outer ring of the bearing.
The repair shop must fully reduce the maximum interference tolerance. If you don't know the benefits of the DC motor bracket for reducing noise, for example, when disassembling the DC motor bearing, I found that the outer ring of the bearing and the end cover fit well. Misunderstood that the bearing is too loose, so you can pad the copper skin, punch holes, or even replace the end cover or bearing, and increase the outer ring diameter to solve this problem. The most common method is to widen the end cover bearing shell, and then insert the sleeve to make The bearing of the end cover is firmly seated with the bearing shell. As a result, the Z series DC motor was repaired. Increased bearing noise, bearing heating and other undesirable phenomena. The bearing is overheated, the grease is pressed out, there is no lubricating oil in the bearing track (bearing working surface), and the bearing is overheated and fails.
www.dw-motor.com