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Mining equipment is characterized by harsh working conditions and huge loads, which easily trigger geometric eccentricity faults in the drive train [2,3] and lead to the prominent problems of high failure rate and short effective life of the drive train. Therefore, to improve the reliability of the mining two-stage planetary gear system, a dynamic model of the meshing contact of the two-stage planetary gear train considering eccentricity faults is established based on ADAMS. The motion characteristics and meshing contact characteristics of the gears are analyzed, and the differences in the effects of eccentricity faults between the first-stage and the second-stage central gear are compared. The results show that the velocity fluctuation amplitude of the first-stage planetary gear train is significantly higher than that of the second-stage but the relative rotation deviation rate of the angular velocity rotating around the central axis from the high-speed end to the low-speed end gradually increases. When the first-stage center gear is eccentric by 1 mm, the effect on the first-stage planetary gear is the most significant, the rotation deviation rate of the first planetary gear is increased by 1.63% while the maximum impact force increases by more than 40%, the maximum instantaneous deviation of the output speed of the system is increased to 19.63%. When the second-stage center gear is eccentric by 1 mm, the effect on the second-stage planetary gear is the most significant, the maximum instantaneous deviation of the second planetary gear increases to 23.16% with a maximum impact force of 200 kN. The results provide a reference for improving the reliability of the two-stage planetary gear train.
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