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Roadheader has been widely used in the constructions such as bridges, tunnels, subway and mine roadway etc, and it is more important to the development of the national economy. The technology of the roadheader is more important in enhancing the driving speed and efficiency during the construction of bridges, tunnels, subway and mine roadway etc. As a result, most of companies and research institutes are now improving the technology of the roadheader. The research of the roadheaders in our country is a little later than the developed countries, but the technology of the roadheader specially the boomed roadheader has been achieved the international advanced level.EBZ135 is a kind of longitudinal axis boomed roadheader, and mainly used to driving the coal and semi-coal rock, and also the tunnel constructions. The torque and power of the cutting head are transmitted by the motor through planetary reducer.The planetary reducer, whose transmission performance and structural determine the cutting performance, structural and size of the roadheader, is an important mechanism of the EBZ135.According to the reserved space and work environment of the EBZ135, it is necessary to simplify the structure, reduce the size and the gear module, and improve the mechanical properties. The following conclusion is given through the analysis and calculation of the original structure and the security check of the planetary reducer, the planetary reducer of the EBZ135 with high security factor, but the gear module is larger, it is necessary to optimize its structure. An optimal structure of EBZ135 roadheader planetary reducer is given in this thesis. The main component on the optimal structure are optimized and calculated such as the transmission ratio and the gear teeth. Compared with the original structure, the optimized structure has the following characters: no modified gear, decreasing gear module from 8 to 5.5, reducing radial dimension by 5%, decreasing transmission impact, lower noise, simplifier structure, convenient to manufacture, installation and maintenance.In this thesis, the solid modeling and simulation of the optimized structure is created with UG, the interference detection and motion simulation is completed by UG. The results of analysis showed that: the optimized structure of the EBZ135 planetary reducer meets the requirements in kinematic field, and all of the components run smoothly without interference.The structure static analyzing for all gears and planetary carrier in the optimized structure of the EBZ135 planetary reducer has been completed by the finite-element analysis software-ANSYS. Through the structure static analyzing, the following conclusions are given: the variation of the stress, the strain and the displacement vector sum produced in the main components are all stationary, and the maximum variation of them are all in the permissive extent of the material.In this thesis, the structural optimization design of EBZ135 planetary reducer is reasonable. The optimized structure of planetary reducer, with high practical value and reliable operation, could meet the transmission ratio and the strength requirements, and also as a theoretical reference of the optimization design of other planetary reducer.
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