How to detect whether there is a problem with the motor bearing? This year, the oil price has risen 5 times in a row, and if the price increase at the end of last year is added, the current oil price is already the price after the 6th consecutive rise. The total price of gasoline and diesel has risen by 2,015 yuan/ton and 1,940 yuan/ton. Price calculation, equivalent to a cumulative increase of 1.59 yuan / liter ~ 1.69 yuan / liter. The national average price of No. 95 gasoline has risen into the "9 yuan era", hitting a new high in the past nine years. Many people choose to ride an electric vehicle to go out. Do you know whether the motor rotates flexibly or not will directly affect the power consumption of the electric vehicle? If the motor is not running flexibly, it will consume a lot of power, the motor will be louder, and the motor will be hot, resulting in a significantly shorter cruising range.

Among them, the excessive clearance of the motor bearing is a common mechanical fault of the motor, so how do we judge whether there is a problem with the motor bearing? Very simple, stand up the car and shake the motor left and right with your hands. If you clearly feel a gap between the left and right, it means that the motor bearing needs to be replaced. When riding, you can also hear the abnormal noise of the motor, and the rotation is not as flexible as when it is running normally. The bearing clearance of the motor is too large. After a long time, the bearing may run out of the outer circle. Once it runs out of the outer circle, even if the motor bearing is replaced, it will not help, and the motor needs to be replaced, which will outweigh the gain. And the larger the gap between the left and right swings, the more likely the brakes will be stuck, and the brake drum cover of the rear wheel and the motor will rub directly during normal running. There is a very harsh screeching sound while riding, and the entire rear wheel gets seriously hot.

Under normal circumstances, if the motor bearing clearance is too large, in addition to incorrect bearing installation, it is a problem of bearing quality. Due to the limitation of raw materials, the raw materials of inferior bearing manufacturers are not enough to be processed to the required standard of bearing steel, so the hardness does not meet the standard. This affects its service life and damages other parts of the machine. In addition, due to the limitations of quenching technology by illegal manufacturers, and the limitations of mechanical equipment for manufacturing bearing standard parts. The quenching temperature of the cylinder bush of the inferior bearing is not uniform, which affects the precision of the bearing, causes deformation, etc., and there will be movement deviation during the user's use.