The model of the convergent planetary trains in the power shift steering Transmission of a certain tracked vehicle is created with Pro/E

The simulation of the model in starting operation is carried out with the multi-body dynamic analysis software ADAMS.The correctness of the simulation is verified according to the matching of the output speed

gear meshing force and calculated values. The simulation results show the impact force of the gear in the starting is much lager than the steady driving force

which provides the basis for strength check and optimizetion design of the convergent planetary trains.