Planetary gearboxs often encounter some problems in their work, such as the problem that the gearbox breaks soon after running. Today, I will take you to understand what causes the output shaft of the gearbox to break. I hope it can help you. .

1. Concentricity of the output end

In some cases, the output shaft of the drive broke after a few months of operation. Why did the gearbox twist 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 was almost identical to the cross-section of the output shaft of the gearbox. The outer ring of the cross-section is brighter, and the color of the cross-section is darker as it goes to the axis, and finally it is broken at the axis! 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 gearbox are not concentric.

When the concentricity of the device between the motor and the gearbox is very good, the output shaft of the motor only receives the rolling force, and the operation will be very smooth. Then, when it is not concentric, the output shaft must receive the radial force from the input end of the gearbox. The long-term action of this radial force will make the motor output shaft bend, and the direction of the bending will change continuously with the rolling of the output shaft. The direction of the lateral force changes 360 degrees for every rotation of the output shaft. If the concentricity error is large, the radial force will increase the temperature of the output shaft of the motor, and its metal structure will be continuously damaged. After all, the radial force will exceed the radial force that the motor output shaft can accept, eventually causing the drive motor output shaft to break. When the concentricity error is large, the output shaft of the drive motor is broken, and the input end of the gearbox also receives the radial force of the motor. If the radial force exceeds the maximum acceptable radial load of the two, the result will also cause the input end of the gearbox to deform or even break. Therefore, it is very important to ensure concentricity in the device!

Intuitively, if the motor shaft and the input end of the gearbox are concentric, the fit between the motor and the gearbox will be very tight, and the contact surfaces between them are closely connected, and if the equipment is not concentric, there will be gaps between the contact surfaces.

Similarly, the output shaft of the gearbox is also broken or bent, and the reason is the same as that of the broken shaft of the drive motor. However, the output of the gearbox is the product of the output of the drive motor and the reduction ratio, which is larger than that of the motor, so the output shaft of the gearbox is more likely to be broken. Therefore, when using the gearbox, the user should also pay great attention to ensuring the concentricity of the output device.

2. The problem of broken shaft caused by the output of the gearbox is too small

In addition to the broken shaft of the gearbox caused by the poor concentricity of the output end device of the gearbox, if the output shaft of the gearbox is broken, it is nothing more than the following reasons.

First of all, the wrong type selection causes the output of the gearbox to be insufficient. When selecting models, some users mistakenly believe that as long as the additional output torque of the selected gearbox meets the operating requirements, this is not the case. First, the additional output torque of the equipped motor is multiplied by the reduction ratio, and the value obtained is in principle smaller than the product. The additional output torque of the nearby gearbox provided by the sample, the second is to consider the overload capacity of the drive motor and the actual maximum operating torque required. Theoretically, the maximum operating torque required by the user. It must be less than 2 times the additional output torque of the gearbox. Especially in some occasions, this principle must be strictly followed. This is not only the maintenance of the gearbox, but also the most important thing is to prevent the output shaft of the gearbox from being twisted and broken. This is mainly because if there is a problem with the equipment, the output shaft of the gearbox and its load are stuck. At this time, the overload capacity of the drive motor will still make it continue to increase its output, which may cause the output shaft of the gearbox to accept The force exceeds twice its extra output torque and twists the output shaft of the gearbox.

Secondly, in the process of acceleration and deceleration, if the instantaneous torque on the output shaft of the gearbox exceeds twice its additional output torque, and this acceleration and deceleration are too frequent, the gearbox will eventually break the shaft. . Considering that this situation is rarely presented, it will not be further introduced here.

The above is the reason for the fracture of the output shaft of the planetary gearbox. More knowledge about the planetary gearbox will be introduced to you by Shenzhen Win-drive.