Modeling And Stress Analysis Of Helical Gear

The gear system is an important part of the mechanical system whos working performance has a critical influence in the entire system. With the improvement of speed and power, gear transmission is headed in high speed and heavy-load direction. Its dynamic behavior research has become a concerning subject by scholars both at home and abroad.This thesis takes a pair of inclined gear transmission system as the research object, analyses the contact performance by using nonlinear contact finite element method. And then combining with the gear modification theory, this thesis puts forward the helical gear tooth shape fixing (drum trim) scheme. The effect of the form was verified by means of simulation. Finally analyses the dynamics performance of inclined gear through ADAMS.Firstly, According to the gear meshing theory. This thesis gets the involute equation, gets the transition curve equation and the helix equation. Then based on these this thesis sets up3d helical gear modeling in the PRO/E.Secondly, This thesis makes contact finite element analysis through importing the gear transmission model into ANSYS Workbench. Then this thesis verifies the effectiveness of nonlinear contact analysis in ANSYS Workbench through comparing the stress with the classic Hertz theory.Then, According to the axis bending deformation and gear twist deformation, this thesis draws the drum trim parameters through applying the gear tooth shape fixing principle and method. After that, this thesis establishes the repair form gear3d modeling in PRO/E and analyses nonlinear contact stress. Comparison to the standard gear results, this thesis verifies the feasibility of the scheme.Finally, Based on the vibration theory, this thesis establishes a mathematical equation of the gear transmission system dynamic model. This thesis researches the produce mechanism of vibration and noise of a gear system. The cause of gear system’s vibration and noise are due for three kinds of internal incentive, namely the stiffness motivation, error incentive and mesh impact incentive. And this thesis deals them with numerical simulation. After all, this thesis makes a dynamic response analysis for the gear transmission system.