Solve the broken shaft problem of servo planetary reducer

When the concentricity of the assembly between the drive motor and the reducer is maintained well, the output shaft of the drive motor bears only the rotational force (torque), and the operation will remain smooth without pulsation.When the two are not concentric, the output shaft of the drive motor needs to bear the radial force (bending moment) from the input end of the reducer.The action of this radial force will force the output shaft of the drive motor to bend, and the direction of bending will change continuously with the rotation of the output shaft.If the concentricity error is large, the radial force will also increase the local temperature of the motor output shaft, which will cause the metal structure of the machine parts to be continuously damaged, and eventually cause the output shaft of the drive motor to fail due to local excessive fatigue. break off.The greater the concentricity error between the two, the shorter the time required for the output shaft of the drive motor to break.While the output shaft of the drive motor may be broken, the input end of the reducer will also bear the radial force from the output shaft of the drive motor. If the radial force exceeds the maximum radial load that the input end of the reducer can bear, other As a result, the input end of the reducer will be deformed or even broken, or the support bearing at the input end will be damaged.It can be seen that it is very important to ensure concentricity during assembly!From the perspective of assembly technology, if the shaft of the drive motor is concentric with the input end of the reducer, then the shaft surface of the drive motor and the hole surface of the input end of the reducer will become very consistent, and their contact surfaces will be tightly attached. Space for radial force action and deformation.However, if the assembly is not concentric, the contact surfaces will not match or there will be gaps, and there will be radial force and provide space and possibility for deformation.

Similarly, the output shaft of the reducer will also be broken or bent, and the reason is similar to that of the broken shaft of the drive motor.However, the output of the reducer is the product of the output of the driving motor and the reduction ratio, so the output will be greater than that of the motor, so the output shaft of the reducer is more likely to be broken.Therefore, when using the reducer, more attention should be paid to the assembly concentricity of the output end!