The mathematical models of the variable includes nonlinear support stiffness

time-varying meshing stiffness

damping

gear backlash

etc are established to analyze the load sharing performance of the helicopter face gear split torque transmission system

and the equivalent gear meshing error principle is used to considering the error caused by system process and installation.The resultshows that

the main influence factoron the face gearsplittorque transmission system is error

and the system load sharing performance can be improved through floating shaft support

and the effect of decreasing single error on system load sharing performance is not obvious.