Some users after the device running for several months, the drive motor output shaft is broken. Why is the speed reducer output shaft of the drive motor is broken? For this reason, we looked at the output shaft cross section of the drive 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, and the darker the cross section is, the more it breaks at the axle center! Fig. 2 is a cross section photograph. Rubber and plastic mechanical reducer, which fully shows that the drive motor output shaft broken shaft is the main reason for the motor and reducer assembly is not concentric!
When the motor and the reducer assembly when the concentricity guarantee is very good, bandoli reducer output shaft of the motor bearing is just turning force, operation will be very smooth. However, not concentric, the output shaft to bear radial force from the input end of gear reducer, the radial force of long-term effects will make the output shaft of the motor is forced to bend, and the bending direction with the rotation of the output shaft changing. Each rotation of the output shaft changes the direction of the transverse force by 360 degrees. If the concentricity error is large, the radial force of the output shaft of the motor temperature rise, the metal structure has been destroyed, the radial force will exceed the radial force of the output shaft of the motor can bear, and finally lead to the output shaft of the driving motor is broken. When the concentricity error is greater, the shorter the output shaft of the drive motor is. The output shaft of the drive motor is broken at the same time, reducer input will also suffer from motor radial force, if the maximum radial load and the radial force at the same time exceeds two person can bear the words, the results will lead to the reducer input end deformation and rupture. Therefore, it is of vital importance to ensure concentricity in assembly!
Intuitively speaking, if the motor shaft and the reducer input end of concentric, so will cooperate with the motor and the reducer is very close, the contact surface between them are closely linked, and the assembly if not concentric, then the contact surface between the gap between them. The left picture in Figure 3 shows that the assembly between the motor and the reducer is very good, while the right picture indicates that the assembly is not good, and the motor shaft and the reducer input are not concentric.
Similarly, the output shaft of the reducer is broken or bent. The reason is the same as that of the drive motor. But the output of the reducer is the output of the drive motor and the reduction ratio. Compared with the motor, the output is greater, so the output shaft of the reducer is more easily broken. Therefore, when the user uses the reducer, it should pay great attention to the guarantee of the concentricity of the output end! Two the output of the reducer is too small, the problem of shaft breaking occurs
In addition to the reducer's broken shaft caused by the poor concentricity of the output end of the reducer, if the output shaft of the reducer is broken, there are no more than the following reasons.
First of all, the wrong selection resulted in insufficient output of the reducer. Some users in the selection, mistakenly believe that as long as the selected rated output torque of reducer can meet the work requirements, in fact, is the rated output torque of the motor by the reduction ratio, the numerical principle is less than the sample products offer similar reducer rated output torque is two, while also taking into account the drive motor overload capacity and the actual required maximum torque. Theoretically, the maximum working torque required by the user must be less than 2 times the rated output torque of the reducer. Especially some applications must strictly abide by the rules, this is not only the protection of inside gear reducer, more important is to avoid the output shaft of the reducer is broken. This is mainly because, if the installation problem, the output shaft of the speed reducer and the load is stuck, then drive motor overload ability will still continue to increase the output, then, may make the capacity of the output shaft of the reducer exceeds its rated output torque is 2 times and break the output shaft of the speed reducer.
Secondly, in the process of acceleration and deceleration, the output shaft of the speed reducer by the instantaneous torque if more than 2 times the rated output torque, and the acceleration and deceleration and too frequent, then eventually made the gear shaft broken. Given the less occurrence of this situation, no further introduction will be given here