Views: 0 Author: Site Editor Publish Time: 2016-07-12 Origin: Site
Some users break the output shaft of the drive motor after running the equipment for several months. Why did the reducer twist the output shaft of the drive motor? For this reason, we checked the cross section of the output shaft of the drive motor and found that it was almost identical to the cross section of the output shaft of the reducer. The outer ring of the cross section is brighter, and the color of the section becomes darker towards the axis, and finally it is broken at the axis! This fully explains that the main reason for the broken shaft of the output shaft of the drive motor is that the motor and the reducer are not at the same time assembling! When the concentricity is guaranteed to be very good when the motor and the reducer are assembled, the output bearing of the motor is only subjected to rotational force and it runs smoothly. However, when it is not concentric, the output shaft has to bear the radial force from the input end of the reducer. The long-term action of this radial force will force the output shaft of the motor to bend, and the direction of bending will change continuously with the rotation of the output shaft. Each time the output shaft rotates one revolution, the direction of the lateral force changes 360 degrees. If the error of concentricity is large, the radial force will increase the temperature of the motor output shaft, and its metal structure will continue to be destroyed. Finally, the radial force will exceed the radial force that the motor output shaft can withstand, resulting in driving The motor output shaft is broken. When the error of concentricity is larger, the time for the output shaft of the drive motor to break is shorter. When the output shaft of the drive motor is broken, the input end of the reducer will also bear the radial force from the motor. If the radial force exceeds the maximum radial load that both can bear, the result will be The input end of the reducer is deformed or even broken. Therefore, it is very important to ensure concentricity during assembly! Intuitively speaking, if the motor shaft and the input end of the reducer are concentric, the fit between the motor and the reducer will be very close, and the contact surfaces between them are tightly connected, and if they are not concentric during assembly, then the contact surfaces between them There will be gaps in between.
Similarly, the output shaft of the reducer is also broken or bent, and the reason is the same as that of the broken shaft of the drive motor. But the output of the reducer is the product of the output of the drive motor and the reduction ratio. Compared with the motor, the output is greater, so the output shaft of the reducer is more likely to be broken. Therefore, when using the reducer, the user should also pay great attention to the guarantee of the concentricity of the output terminal assembly! The shaft breakage problem caused by the too small output of the reducer: In addition to the broken shaft of the reducer caused by the poor concentricity of the output end of the reducer, if the output shaft of the reducer breaks, there are nothing more than the following reasons:
First of all, the wrong selection caused insufficient output of the reducer. Some users mistakenly think that as long as the rated output torque of the selected reducer meets the working requirements, it is not true. First, the rated output torque of the equipped motor is multiplied by the reduction ratio, and the value obtained is in principle smaller than the product The samples provided are similar to the rated output torque of the reducer. Second, the overload capacity of the drive motor and the actual required maximum working torque must also be considered. Theoretically, the maximum working torque required by the user must be less than 2 times the rated output torque of the reducer. Especially in some applications, this criterion must be strictly followed. This is not only to protect the gears in the reducer, but also to prevent the output shaft of the reducer from being twisted. This is mainly because if there is a problem with the installation of the equipment, the output shaft of the reducer and its load are jammed. At this time, the overload capacity of the drive motor will continue to increase its output, which may cause the output bearing of the reducer to be affected. The force exceeds 2 times the rated output torque and twists the output shaft of the reducer. Secondly, in the process of acceleration and deceleration, if the instantaneous torque applied to the output shaft of the reducer exceeds twice its rated output torque, and this acceleration and deceleration are too frequent, the reducer will eventually be broken. . Of course, this situation is rare.