Dynamic characteristics of planetary gear transmission system in hybrid commercial vehicle ECVT
XIANG Dongyang
CHEN Yong
CHEN Tao
WU Chaoyang
XU Zhengyun
ZHANG Rirui
Abstract：[Objective]Although abundant achievements have been made in the dynamic characteristics research of planetary gear transmission systems,existing studies mostly focus on straight-tooth structures,leaving a theoretical gap in the dynamic research of helical planetary gear systems used in electronic continuously variable transmissions(ECVT)for hybrid commercial vehicles.To address the vibration issues of the planetary gear transmission system in ECVT,in-depth research was conducted.[Methods]Taking the engine direct-drive mode as the research condition,a 24-degree-of-freedom(24-DOF)lumped parameter analytical model was constructed by comprehensively considering nonlinear factors such as meshing phase difference,time-varying meshing stiffness,and tooth side clearance.The Runge-Kutta numerical solution method was used to obtain the time-domain responses of dynamic parameters such as vibration displacements in the x,y,z directions and dynamic meshing forces of each component in the system.The frequency-domain characteristics were analyzed combined with fast Fourier transform.[Results]The study shows that in the planetary gear transmission system,the mean value of the axial vibration displacement of the sun gear is the most prominent,and the vibration characteristics of the remaining components show regular distribution.The values of internal and external dynamic meshing forces in the system are significant,reflecting high tooth surface bearing loads.By building an ECVT test bench platform to simulate actual working conditions and collect vibration signals,the effectiveness and reliability of the theoretical analysis model are verified.The research results can provide reference for the structural optimization design and vibration characteristic improvement of the planetary gear transmission system in ECVT for hybrid commercial vehicles.
Keywords：ECVTPhase differencePlanetary gear transmissionDynamic responseVibration analysis
Publication Date：2025-09-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：12( 26-37 )