The main causes of noise in planetary gearboxes

The planetary gearbox is an important component widely used in mechanical transmission. When a pair of gears mesh, due to the inevitable errors such as tooth pitch and tooth shape, meshing impact will occur during operation and occur corresponding to the gear meshing frequency. Noise, friction noise also occurs due to relative sliding between tooth surfaces. Since gears are the basic parts in gearbox transmission, reducing gear noise is very necessary to control gearbox noise. Generally speaking, the main reasons for the occurrence of gear system noise include the following aspects:
1. Gear design. Improper parameter selection, too small coincidence, improper or no modification of the tooth profile, unreasonable gearbox structure, etc. In terms of gear processing, the base pitch error and tooth profile error are too large, the tooth side clearance is too large, the surface roughness is too large, etc.
2. Gear train and gear box. The assembly is eccentric, the contact accuracy is low, the parallelism of the shaft is poor, the rigidity of the shaft, bearing and support is insufficient, the rotation accuracy of the bearing is low and the clearance is improper, etc.
3. Input torque from other aspects. Fluctuation of load torque, torsional vibration of the shaft system, balance of the motor and other transmission pairs, etc.