Issue 23: Hengyu Guoqiang reducer - problems in different axes
Time：2018-06-29 | Source：恒宇国强 | Browse：9215537
We checked the cross section of the output shaft of the drive motor and found that it is almost the same as that of the reducer. The outer ring of the cross section is brighter, and the darker the cross section is toward the axis, and finally it is broken at the axis! This fully shows that the main reason for the broken shaft of the drive motor output shaft is that the motor and reducer are not concentric when they are assembled!
When the concentricity between the motor and reducer is ensured very well, the motor output shaft only bears the rotating force, and the operation will be very smooth. However, when it is not concentric, the output shaft will bear the radial force from the input end of the reducer, which will force the motor output shaft to bend for a long time, and the bending direction will change with the rotation of the output shaft. The direction of the lateral force changes 360 degrees with each rotation of the output shaft. If the concentricity error is large, the radial force will cause the temperature of the motor output shaft to rise, and the metal structure will be constantly damaged. Finally, the radial force will exceed the radial force that the motor output shaft can bear, and finally the drive motor output shaft will break. When the error of concentricity is larger, the time of output shaft breaking is shorter. When the output shaft of the drive motor breaks, 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 also lead to the deformation and even fracture of the input end of the reducer. Therefore, it is very important to ensure the concentricity during assembly!
Intuitively speaking, if the motor shaft and the input end of the reducer are concentric, then the matching between the motor and the reducer will be very close, and the contact surfaces between them are closely connected. If they are not concentric during assembly, then there will be a gap between the contact surfaces.
Similarly, the output shaft of the reducer is also broken or bent, and the reason is the same as that of the drive motor. However, 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 of the reducer is greater, so the output shaft of the reducer is more likely to be broken. Therefore, the user should pay attention to the concentricity of the output end assembly when using the reducer!
The output of the reducer is too small and the shaft is broken. In addition to the broken shaft of the reducer caused by the poor concentricity of the output end assembly of the reducer, if the output shaft of the reducer is broken, there are only the following reasons:
First of all, the wrong selection results in insufficient output of the reducer. Some users mistakenly believe that as long as the rated output torque of the selected reducer meets the working requirements, it is not. First, the value obtained by multiplying the rated output torque of the motor with the reduction ratio is in principle less than the rated output torque of the similar reducer provided by the product sample, The other is to consider the overload capacity and the maximum working torque of the drive motor. In theory, the maximum working torque required by the user must be less than 2 times of the rated output torque of the reducer. In particular, some applications must strictly abide by this rule, which is not only to protect the gear inside 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 and the output shaft and its load of the reducer are stuck, the overload capacity of the drive motor will continue to increase its output, and then the force on the output shaft of the reducer may exceed 2 times of its rated output torque and the output shaft of the reducer may be twisted off.
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