Optimum Design And Temperature Analysis Of Gear Profile Modification

Gear transmission has many advantages,such as smooth transmission,so the gear transmission device is used as an important power transmission and sports devices are widely used in the machinery industry.The good dynamic performance and reliability of the gear system are of great significance to the mechanical equipment.Gear drive,the gear drive system by the dynamic excitation will produce vibration and noise.Gear transmission system in the long-term high speed and heavy load in the case of work,but also to meet the long life,low noise,low quality and many other requirements.Due to the processing and assembly process level and the external environment of many factors,will cause the gear elastic deformation,manufacturing error,installation error,thermal deformation and other random factors exist,will produce meshing out impact and load mutation,resulting in The transmission is not smooth and produces noise and vibration.The gear profile is modified to improve the gear transmission performance.The main work accomplished includes the flowing:(1)The theoretical maximum contact stress,meshing stiffness and static transmission error are calculated by the Hertzian contact theory,the gear meshing stiffness theory and the static transmission error theory.(2)Using parametric design language APDL of ANSYS software,a parameterized three-dimensional model of gear was established and the contact static analysis was carried out on the gear.In the analysis results,the maximum contact stress,the static transmission error and the change of the total meshing stiffness at each position during the meshing process are obtained and compared with the theoretical values.(3)Tooth profile modification was performed on the gear.The static transmission error and meshing stiffness of the gear before and after the modification were compared to prove that the profile modification can improve the gear transmission performance.The effect of two parameters on the dynamic performance of the gear was studied by changing the length and the amount of modification.The gear profile was optimized by using Romax software to get the best modification parameters.Reliability analysis of unmodified and toothed optimized gears.(4)Using the ANSYS software to analyze the gear before and after modification,and the temperature field of the gear before and after the tooth profile was compared and optimized.