The gear system used for large torque transmission consists of one wheel ring with diameter 1264mm and three pinions with diameter 224mm. This assembly can be used to 440kNm and 20Hz dynamical torque transmission. On the basis of FEM, 3-D gear model was established and modal analysis was constructed by using software ANSYS. Two modal analysis methods were used. One of which was equivalent contact stiffness by simplified into a spring model and the other method was considering the pre-stress in the strength analysis. The latter method is more reasonable than the first one because it contains the nonlinear contact factors. The results show that there is no vibration mode with the frequency below 100Hz and no resonance will appear in the following dynamical torque loading tests.
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