In response to the requirements of the encased differential planetary train in terms of vibration reduction and noise reduction

a method for contribution analysis of vibration transfer paths was proposed. Taking the time-varying meshing stiffness and error equivalent displacement generated during gear meshing as internal excitation

the vibration transfer path of the encased differential planetary train was analyzed

and the contribution of each vibration transfer path was discussed based on the power flow method. Results showed that

the vibration receiving structure including the output shaft

the differential stage sun gear and the encased stage star gear at the maximum resonance frequency corresponded to the maximum common amplitude values of 14 010

3 314，95 180 (m/s2)/Hz

respectively. According to the conclusion

the path 4 including the encased stage ring gear and the output shaft had a vibration transfer path contribution percentage of 777%

775%

786% and 699%

respectively

under the differential stage external meshing excitation

differential stage internal meshing excitation

encased stage external meshing excitation and encased stage internal meshing excitation. The encased stage ring gear and output shaft play a major role in the vibration transmission of the encased differential planetary train.