In the reducer industry, SIELI's precision reducer is widely used in servo, stepping, DC and other transmission systems due to its many advantages such as quietness, high precision, high rigidity, high torque and no grease leakage. Its role is to reduce the speed increase torque and reduce the load/motor moment of inertia ratio under the premise of ensuring precision transmission. In the past few years, some users have suffered from unnecessary damage when the reducer is broken due to human factors such as illegal installation. Therefore, in order to better help the users to use the SIELI precision reducer, this paper analyzes the reasons for the reducer and drive motor broken shaft, and describes in detail how to correctly install the planetary reducer.


First, the broken axis problem occurs in different hearts


       Some users have broken the output shaft of the drive motor after the device has been running for a few months. Why does the reducer break the output shaft of the drive motor? To this end, we looked at the cross-section of the output shaft of the drive motor and found that it is almost identical to the cross-section of the output shaft of the reducer. The outer ring of the cross section is brighter, and the darker the cross section toward the axis, the final break to the axis! This fully explains 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 assembled.


       When the concentricity between the motor and the reducer is guaranteed to be very good, the motor output bearing is only subjected to the rotational force and will be smooth during operation. Then, at different times, the output shaft is subjected to radial forces from the input end of the reducer. This long-term action of the radial force will cause the motor output shaft to be forced to bend, and the direction of the bend changes continuously with the rotation of the output shaft. The direction of the lateral force changes 360 degrees each time the output shaft rotates. If the error of the concentricity is large, the radial force causes the temperature of the output shaft of the motor to rise, and the metal structure is continuously destroyed. Finally, the radial force will exceed the radial force that the output shaft of the motor can withstand, and finally the drive is caused. The motor output shaft is broken. When the error of the concentricity is larger, the output shaft of the drive motor is broken, and the input end of the reducer is also subjected to the radial force from the motor. If this radial force exceeds the maximum radial force that both can withstand If the load is applied, the result will also cause deformation or even breakage at the input end of the reducer. Therefore, it is important to ensure concentricity during assembly!


       Intuitively, if the motor shaft and the input end of the reducer are concentric, the cooperation between the motor and the reducer will be very tight, and the contact faces between them will be tightly connected, and if they are not identical during assembly, the contact faces between them will be There will be gaps between them.


       Similarly, the output shaft of the reducer also has a broken or bent phenomenon, which is caused by the same reason as the broken shaft of the drive motor. However, the output of the reducer is the product of the output and the reduction ratio of the drive motor. The output of the reducer is larger than that of the motor, so the output shaft of the reducer is more easily broken. Therefore, when using the reducer, the user should pay attention to the assurance of the concentricity of the output.


Second, the output of the reducer is too small, the broken shaft problem


       In addition to the broken shaft of the reducer due to the poor concentricity of the output of the reducer, the output shaft of the reducer is broken, which is due to the following reasons.


       First of all, the wrong selection results in insufficient output of the gear unit. Some users mistakenly believe that as long as the rated output torque of the selected reducer meets the working requirements, it is not the case. First, the rated output torque of the motor is multiplied by the reduction ratio, and the obtained value is in principle smaller than the product. The sample provides the rated output torque of the similar reducer, and the second is to consider the overload capability of the drive motor and the maximum working torque required in practice. In theory, the maximum working torque required by the user. Must be less than 2 times the rated output torque of the reducer. In particular, in some applications, this criterion must be strictly observed. This is not only the protection of the reducer, but also the interruption of the output shaft of the reducer. This is mainly because if the equipment is installed with a problem, the output shaft of the reducer and its load are stuck. At this time, the overload capability of the drive motor will continue to increase the output, and thus the output bearing of the reducer may be affected. The force exceeds twice the rated output torque and the output shaft of the reducer is broken.


        Secondly, during the acceleration and deceleration, if the output torque of the output shaft of the reducer exceeds twice the rated output torque, and the acceleration and deceleration are too frequent, the reducer will eventually be broken. . Considering that this situation occurs less, it will not be further introduced here.


Third, the correct installation of the reducer


        Proper installation, use and maintenance of the reducer is an important part of ensuring the normal operation of mechanical equipment. Therefore, when you install the SIELI Planetary Reducer, be sure to carefully assemble and use it in strict accordance with the following installation and use.


        The first step is to confirm whether the motor and the reducer are intact before installation, and strictly check whether the dimensions of the parts connected to the reducer are matched. Here are the dimensions of the positioning boss of the motor, the input shaft and the groove of the reducer. tolerance. The second step is to unscrew the screw on the outer side of the flange of the reducer flange, adjust the clamping ring so that the side hole is aligned with the dust hole, and insert the inner hexagon to tighten. After that, remove the motor shaft key. The third step is to naturally connect the motor to the reducer. When connecting, it must be ensured that the output shaft of the reducer is concentric with the input shaft of the motor, and the outer flanges of the two are parallel. As the heart is inconsistent, it will cause the motor shaft to break or the reducer gear to wear. In addition, it is strictly forbidden to hit with a hammer or the like during installation to prevent damage to the bearing or gear due to excessive axial force or radial force. Be sure to tighten the mounting bolts before tightening the tightening bolts. Before installation, wipe the anti-rust oil of 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 to prevent unnecessary wear.


        Before connecting the motor to the reducer, first align the motor shaft keyway with the tightening bolt. To ensure uniform force, please screw the mounting bolts at any diagonal position, but do not tighten them. Then screw the mounting bolts at the other two diagonal positions and tighten the four mounting bolts one by one. Finally, tighten the tightening bolts. All tightening bolts are to be fixed and inspected using the torque wrenches according to the indicated fixed torque data.


         The correct installation between the reducer and the mechanical equipment is similar to the correct installation between the reducer and the drive motor. The key is to ensure that the output shaft of the reducer is concentric with the shaft of the driven part.


Fourth, the conclusion


       With the continuous development of the global industry, the role of SIELI's precision reducer in the transmission field is becoming more and more obvious. I hope that in the future use, SIELI speed reducer can bring you more convenience and benefits!