How to correctly install the planetary reducer

In the reducer industry, reducers are widely used in servo, stepper and DC transmission systems due to their advantages of quietness, high precision, high rigidity, high torque and no grease leakage. Its function is to reduce the speed, increase the torque, and reduce the load/motor moment of inertia ratio under the premise of ensuring accurate transmission. In the past few years, when some users used the reducer, the output shaft of the reducer was broken due to human factors such as illegal installation, which caused unnecessary losses to the enterprise. Therefore, in order to help users use the reducer better, the reasons for the broken shaft of the reducer and the drive motor are analyzed, and how to correctly install the planetary reducer is introduced in detail. A Broken Shaft Problem with a Different Center Some users have broken the output shaft of the drive motor after the equipment has been in operation for several months. Why does the reducer twist off the output shaft of the drive motor? For this reason, we checked the cross-section of the output shaft of the driving 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, while the color of the cross-section is darker towards the axis, where it breaks! This fully shows 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 concentric during assembly. When the assembly concentricity between the motor and the reducer is well guaranteed, the motor output bearing only accepts the rotational force and runs smoothly. Then, when it is not concentric, the output shaft will bear the radial force from the input end of the reducer. The long-term action of this radial force will bend the output shaft of the motor, and the bending direction will change with the rotation of the output shaft. Each time the output shaft rotates, the direction of the lateral force changes 360 degrees. If the concentricity error is large, the radial force will increase the temperature of the motor output shaft, and its metal structure will be continuously damaged. The radial force will exceed the radial force that the output shaft of the motor can bear, and the output shaft of the drive motor will break. When the concentricity error is large, the output shaft of the driving motor is broken, and 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 at the same time, the input end of the reducer will be deformed or even broken. Therefore, it is very important to ensure concentricity during assembly! Intuitively, if the motor shaft and the input end of the reducer are concentric, the fit between the motor and the reducer will be very tight, and the contact surface between the two will be tightly connected, and if they are not concentric during assembly, the contact between the two will be very tight. There will be gaps.  Similarly, the output shaft of the reducer is broken or bent for the same reason as the shaft of the drive motor is broken. 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 shaft of the reducer is more likely to break. Therefore, users should also pay great attention to ensuring the concentricity of the output components when using the reducer. The output of the two-stage reducer is too small to cause the broken shaft. In addition to the poor concentricity of the output end of the reducer, which causes the broken shaft of the reducer, if the output shaft of the reducer is broken, the reasons are as follows. First of all, the wrong type selection leads to insufficient output of the reducer. Some users mistakenly think that only the rated output torque of the selected reducer can meet the work requirements when selecting the model, but it is not the case. First of all, the rated output torque of the matching motor multiplied by the reduction ratio will in principle be smaller than the rated output torque of the same type of reducer provided in the product catalog; second, the overload capacity of the driving motor and the actual required large working torque should be considered at the same time. Theoretically, the maximum working torque required by the user. It must be less than twice the rated output torque of the reducer. 

Especially in some applications, this criterion must be strictly followed, not only to protect 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 of the reducer and its load are stuck, the overload capacity of the drive motor will still make it continuously increase the output, which may cause the output bearing of the reducer to bear more than twice The rated output torque, twist off the output shaft of the reducer. Secondly, in the process of acceleration and deceleration, if the instantaneous torque multiplied by the output shaft of the reducer exceeds twice its rated output torque, and the acceleration and deceleration are too frequent, the reducer will break the shaft. Considering that this situation is relatively rare, it will not be further introduced here. The correct installation of the three reducers The correct installation, use and maintenance of the reducer is an important link to ensure the normal operation of mechanical equipment. Therefore, when installing the planetary reducer, please strictly follow the following installation and use related matters, and assemble and use it carefully.

 The first step is to confirm whether the motor and reducer are in good condition before installation, and strictly check whether the dimensions of the parts connected to the motor and reducer match. The following are the dimensions and fit tolerances of the motor positioning boss, input shaft, and reducer slot. The second step is to loosen the screw on the dust hole on the outer side of the flange of the reducer, adjust the snap ring to align the side hole with the dust hole, and insert the inner hexagon to tighten. After that, remove the motor shaft key. The third step is the natural connection between the motor and the reducer. When connecting, the concentricity of the output shaft of the reducer and the input shaft of the motor must be consistent, and the outer flanges of the reducer and the motor must be parallel. Due to inconsistent concentricity, it will cause the motor shaft to break or the reducer gear to wear. In addition, during the installation process, it is strictly forbidden to hit with a hammer or the like. To prevent excessive axial force or radial force from damaging bearings or gears. Be sure to tighten the mounting bolts before tightening the fastening bolts. Before installation, wipe the anti-rust oil on the motor input shaft, positioning boss and reducer connection with gasoline or zinc sodium water. Its purpose is to ensure the tightness of the connection and the flexibility of operation, and prevent unnecessary wear and tear. Before connecting the motor with the reducer, make the keyway of the motor shaft perpendicular to the tightening bolt. In order to ensure uniform force, please tighten the mounting bolts at any diagonal position first, but do not tighten them, then tighten the other two diagonal mounting bolts, and then tighten the four mounting bolts one by one. Finally, tighten the tension bolts. All tightening bolts should be tightened and checked with a torque wrench according to the marked tightening torque data. The correct installation between the reducer and mechanical equipment is similar to the correct installation between the reducer and the drive motor. The key is to ensure that the concentricity of the output shaft of the reducer is consistent with that of the driven part of the shaft.