Summary:...
When the assembly concentricity between the
planetary gearmotor and the reducer is guaranteed to be good, the output shaft of the drive motor bears only the rotational force (torque), and the operation will be smooth without pulsation. When it is not concentric, the output shaft of the drive motor also bears 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 increase the local temperature of the output shaft of the motor, and its metal structure will be continuously damaged, which will eventually cause the output shaft of the driving motor to break due to local fatigue.
The greater the error of the concentricity of the two, the shorter the time for the output shaft of the drive motor to break. When the output shaft of the drive motor is 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.
Therefore, it is very important to ensure concentricity during assembly! From the analysis of the assembly process, if the shaft of the driving motor and the input end of the reducer are concentric, then the shaft surface of the driving motor and the hole surface of the input end of the reducer will be very consistent, and their contact surfaces are tightly attached without radial force and deformation. space. If the assembly is not concentric, then the contact surfaces will not match or there will be gaps, there will be radial force and provide space for deformation.
Similarly, the output shaft of the reducer is also broken or bent, and the reason is the same as that of the drive motor.
EN
