What is the cause of the DC geared motor
bearings being too tight?
The lower limit of the tolerance range is used for the emphasis. The vehicle is not willing to reach the upper limit. This makes the bearing chamber diameter smaller and increases the interference with the outer ring of the bearing. In addition, the maximum interference amount for repair workers to reduce the fit tolerance properly The benefits of DC motor bearings to reduce noise are not well understood.
For example, when disassembling a DC motor bearing, it is found that the outer ring of the bearing cooperates with the end cover very well. I mistakenly think that the bearing is too loose. To increase 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 to make the bearing fit tightly with the end cap bearing chamber. As a result, the bearing noise of the DC motor is increased after the repair, and the bearing is heated. unpleasant sight.
Due to the over-tightening of the bearing, the bearing heats up, causing the grease to be squeezed out, and the bearing track (bearing working surface) is locally free of lubricating oil, which causes bearing failure due to overheating of the bearing.