Planetary gearbox is a wide range of industrial products, its performance can be comparable with other military-grade gearbox products, but has the price of industrial-grade products, planetary gearbox is widely used in East China, North China, is used in a wide range of industrial applications. It can also be used as supporting parts for lifting, excavation, transportation, construction and other industries.
The planetary gearbox is tightly integrated by an inner tooth ring on the tooth box housing, with a sun gear driven by external power at the center of the ring tooth, and between the two there is a set of planetary gear sets of three gears equally grouped on the tray. The inner ring and solar tooth support plankton during the period, the planetary gear reducer when the force side power drives the solar teeth, can drive the planetary gear rotation, and follow the trajectory of the inner ring along the center of the public, the rotation of the star driving the power connected to the power shaft of the pallet. In the gearbox mechanism used to transmit power and motion, the planetary gearbox is a precision gearbox with a deceleration ratio of 0.1 ext. -0.5 s/min.
Planetary gearboxes often experience faults due to improper installation in practice, and the gearbox and drive motor break shafts are one of the main types of faults. The analysis of the mechanism of the shaft break is helpful to our customers to understand how to properly install the planetary gearbox and better play the role of the planetary gearbox.
First, the problem of broken axis in different hearts
Some users have broken the output shaft of the drive motor after the device has been running for some time. Why does the output shaft of the drive motor break? When we look closely at the output axis cross-section of the drive motor break, we will find that the outer ring of the cross-section is brighter, and the darker the cross-section color at the far axis, and finally at the axis is the broken trace (dot mark). Most of this phenomenon is caused by the different hearts of the two when driving the motor and the gearbox assembly.
When the same degree of assembly between the drive motor and the gearbox is guaranteed to be good, the drive motor output shaft is subjected to only rotational power (torque) and will run smoothly without pulsation. At different hearts, the drive motor output shaft also bears radial force (bending moment) from the gearbox input. The effect of this radial force will force the drive motor output shaft to bend, and the direction of bending will change as the output shaft rotates. If the error of the center degree is large, the radial force causes the local temperature of the motor output shaft to increase, and its metal structure is constantly destroyed, which will eventually cause the drive motor output shaft to break due to local fatigue. The greater the error of the two heart degrees, the shorter the time it takes for the drive motor output shaft to break. At the same time that the drive motor output shaft breaks, the gearbox input will also bear radial forces from the drive motor output shaft, if this radial force exceeds the maximum radial load that the gearbox input can withstand, the result will also lead to deformation of the gearbox input or even break or damage to the input support bearing. Therefore, it is important to ensure the same heart when assembling!
From the assembly process analysis, if the drive motor shaft and the gearbox input con center, then the drive motor shaft surface and the gearbox input hole surface will be very consistent, their contact surface is closely attached, there is no radial force and deformation space. If the assembly of different hearts, then the contact surface will not match or there is a gap, there is radial force and provide space for deformation.
Similarly, the output shaft of the gearbox is broken or bent for the same reason as the shaft break that drives the motor. However, the output force of the gearbox is the product of the drive motor force and deceleration ratio, which is greater than the motor, so the output shaft of the gearbox is more likely to be broken. Therefore, when using the reducer, the user should pay more attention to the assurance of the same heart when assembling its output!
Second, the gearbox force is too small to appear the problem of broken shaft
If the drive motor shaft is not broken, but the output shaft of the gearbox is broken, in addition to the deceleration output assembly of the same heart is not good reasons, there will be the following possible reasons.
First of all, the wrong selection results in insufficient force of the equipped gearbox. Some users in the selection, mistakenly believe that as long as the selected gearbox rated output torque to meet the work requirements, in fact, it is not. First, the ratio of the rated output torque of the driven motor is less than the corresponding rated output torque provided by the sample of the gearbox product in principle, and the second is to consider the overload capacity 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, some applications must strictly adhere to this guideline, which is not only the protection of the gear and shaft system inside the gear, but also to avoid the gearbox output shaft is broken. If these factors are not taken into account, once the equipment installation problems, the output shaft of the gearbox is stuck by the load, then the overload capacity of the drive motor will still make it continuously increase the output force, until the output shaft of the gearbox withstands more force than its maximum output torque, the shaft will break. If the gearbox is rated with a certain margin of output torque, the slot cake condition of breaking the output shaft is avoided.
Second, in the process of acceleration and deceleration, the gearbox output shaft withstands an instantaneous shock torque of more than 2 times its rated output torque, and this acceleration and deceleration is too frequent, then the reducer will eventually break the shaft. If this is the case, careful calculations should be made to consider increasing torque margin.
With the continuous development of control motor applications, planetary gearboxes will be used more and more in the field of motion control transmission. We hope you will ensure that the planetary gearbox is installed correctly before use, providing reliable and safe operation for your equipment!