Abstract：In order to investigate the coupled nonlinear characteristic of two-stage gear with chipping fault, nonlinear dynamics dimensionless equations of a single gear pair and two-stage gear with time varying meshing stiffness, errors of transmission and backlashes are established and solved by the numerical method. The bifurcation and chipping fault properties of the 1st gear pair in both systems are analyzed by using bifurcation diagram, phase contrail and Poincaré section with the excitation frequency increase. The paper shows that the two-stage gear system periodic motion interval and amplitude increases, and chaotic interval shorten and delay by the coupling characteristics, which play an inhibitory effect on chaos; The tooth chipping failure increases crisis points and changes intermittent period movements into uncertainty of the single stage gear system, when it only increases intermittent periodic motion amplitude of two-stage gear system.
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