Strength Analysis And Research Of Profile Modification For Large Involute Helical Internal Gear Pair

Sustainable energy strategy which is a kind of priority development strategy promotes that the new energy gradually replaces fossil fuel energy. In all kinds of new energy, wind power in many developed countries has occupied a very important position at present. Along with the constant international cooperation study, all kinds of mature wind energy conversion technology can gradually meet the rapid development of all related industries. Wind generation set research and development has become the leading in today’s society green energy development trend.Gear box in the rapid development of wind power industry plays a vital role. And the operation stability and reliability of the gear box is very important. So the analysis of gear meshing process of the strength and the optimization design of gear box is the most important step. Installation positions of the wind power generation and the objective factors in the design of the gear boxes are considered. And the gear meshing process of contact stress and tooth root bending stress are analyzed. Combining with the design examples of gear box in the MW wind turbines from Shenyang Blower group wind co., LTD. Absorb structure technology of gear box in2MW wind power generation unit and develop the gear box which has independent intellectual property rights. The global and local of the gear box is analyzed, thus the transmission performance and the carrying capacity of the gears is improved, therefore, the design scheme is determined.Based on the wind gear box drive system first level planetary wheel helical internal gear pair, three dimensional modeling and finite element analysis method is used. Combined with gear-tooth correction theory, the helical gear modification scheme, including the tooth profile modification and spiral angle finishing is proposed. The simulation technology is used to alter shape effect verification. The mainly research contents of the article are as follows:(1) The classical method of contact mechanics is used to solve the gear contact stress and tooth root bending stress in the meshing process. Compared with the allowable contact stress and allowable tooth root bending stress, the gear box design rationality is determined.(2) Accurate model of the helical internal gear is established by Pro/E. The seamless interface technology is used to import the model in the ANSYS to finite element analysis. Compared with the same parameters of straight internal gear, the helical internal gear meshing process is determined to large contact area and reductive the contact stress.(3) The profile modification shape and the axial modification are separately used on the internal gear and planetary gear in primary planetary gear train. The most contact stress is determined by the finite element analysis, the gear transmission performance and the intensity of the situation can be improved by the gear modification.