Study On Involutes Gear Profile Modification Based On Contact Finite Element Analysis

Wind power generation technology, as green and economical energy, has broad application foreground. With the development of large-power and higher performance wind power generation, it is of great importance to study on design and manufacture technology of wind power equipment. In this paper, the gear accelerator's transmission system of megawatt wind power generation bought by DHI Gear Reducer Plant is regarded as the research object. Based on the theories of gear engagement, contact analysis, vibration and impact, contact simulation of the gear transmission system is investigated to achieve tooth profile modification by finite element method.Firstly, according to elastic engagement principle of gear transmission and profile modification theory, a new method is proposed to acquire the modification curve based on contact finite element analysis.Secondly, parametrical finite element model of helical gear is established by APDL program in ANSYS. Parametric modeling is convenient to segment model, generate hexahedral finite element mesh and control grid density.Thirdly, contact finite element model is established according to the principles of gear transmission. Based on finite element software ANSYS, practical software for processing gear contact finite element analysis is developed by using VB language in this paper. Contact finite element model at different position is generated and profile modification is operated in meshing process using the software. Based on method of HR, refinement of hexahedral finite element mesh is realized by APDL program.Finally, according to conjugate engagement theory, deformation law of ideal elastic gear is analyzed under load. Optimum gear profile modification is then determined by simulation results. The gear profile modification curves including line, parabolic are researched. The results showed that parabolic curve improves the load distribution of contact area, eliminate the stress concentration and decrease the impact vibration caused by base pitch error. The profile modification method in the paper is proved to be feasible.The integrated process of gear-modeling, contact simulation, profile modification by APDL program has the reference value and guiding significance for further study on motion performance of gear transmission system and tooth longitudinal modification.