dc motor 12v factory tells you why the DC motor bearing is too tight
The reason why the DC motor bearing is too tight:
Emphasis is placed on the lower limit of the tolerance range, and the vehicle is not allowed to reach the upper limit. This makes the diameter of the bearing chamber small, which increases the interference with the outer ring of the bearing. In addition, the maximum interference of the repairman to appropriately reduce the tolerance of the fit The bearing of the DC motor is not good enough to reduce the noise. For example, when the bearing of the DC motor is removed, it is found that the outer ring of the bearing and the end cover are very well disassembled. It is mistaken that the bearing is too loose, saying that the bearing "jumped the hole and then the copper pad, Punching the eye, even replacing the end cap, or replacing the bearing, expanding the diameter of the outer ring to solve this problem, the most common method is to expand the end cap bearing chamber, and then insert the sleeve so that the bearing and the end cap bearing chamber are closely matched, As a result, the noise of the DC motor after repairing the bearing increases, the bearing heats up, etc. Due to the tightness of the coupling, the bearing heats up, the grease is squeezed out, the bearing runway (bearing working surface) is partially free of lubricating oil, and the bearing is overheated and causes bearing failure. .
