When the concentricity of the assembly between the drive motor and the WPWDKS155,WPWDKS175,WPWDKS200,WPWDKS250,WPWKO40 reducer is well maintained, the output shaft of the drive motor only bears rotational force (torque), and it will also maintain smooth operation without pulsation. When the two are not concentric, the output shaft of the driving motor also needs to withstand radial force (bending moment) from the input end of the reducer. The effect of this radial force will force the output shaft of the driving motor to bend, and the direction of the bending will continuously change with the rotation of the output shaft. If the concentricity error is large, the radial force will also cause the local temperature of the motor output shaft to rise, leading to continuous damage to the metal structure of the machine components, ultimately leading to the drive motor output shaft breaking due to local excessive fatigue. The greater the concentricity error between the two, the shorter the time required to break the output shaft of the driving motor. While the output shaft of the drive motor may break, the input end of the reducer will also bear radial force from the output shaft of the drive motor. If this radial force exceeds the maximum radial load that the input end of the reducer can withstand, the result will be deformation or even fracture of the input end of the reducer, or damage to the input end support bearing. From this, it can be seen that ensuring concentricity is crucial during assembly! From the perspective of assembly technology, if the drive motor shaft is concentric with the input end of the reducer, 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, eliminating the space for radial force and deformation. If the assembly is not concentric, there will be mismatches or gaps between the contact surfaces, resulting in radial force and providing space and possibility for deformation.
Similarly, the output shaft of the gearbox may also experience breakage or bending, similar to the reason for the shaft breakage of the drive motor. But the output of the reducer is the product of the output of the driving motor and the reduction ratio, so the output is greater compared to the motor, so the output shaft of the reducer is more likely to be broken. Therefore, when using a reducer, great attention should be paid to the assembly concentricity of its output end!
