| Summary: | 碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 103 === This paper mainly discuss the impact of gear profile shifted design and material temperature coefficient for the load-bearing capacity of plastic gears and plastic gears deformation. Using finite element analysis software MSC.Marc, to simulate tooth engagement for different amounts of profile shifted. Discuss stress and strain of gears in several different temperature environment, and summarized results of the analysis to predict the plastic gear damage scenarios.
Nonlinear plastic material used in the simulation is produced by the Ticona company's Celcon-M90.During the study, the first to use MatLab to calculate Litvin toothed algorithms with a number of different transfer coefficient, and then simulate and discuss the dedendum stress and deformation and interference problems for plastic gear in -40 ℃, 23 ℃, 40 ℃, 60 ℃, 80 ℃, 100 ℃, 120 ℃ operating temperature environment.
The simulation results show that the use of multiple teeth or complete gear pair module for contact analysis can more accurately calculate the interference situation due to deformation caused by plastic gears. Increased profile shifted can effectively increase the ability to withstand the load of gear. When the gear to withstand the same load situation, because of the increased profile shifted changed tooth, so reducing the amount of deformation of gear and reduce interference. And the change in temperature will affect the strength of the plastic material, but do not have much effect on the interference position. On this simulation of plastic materials, increase profile shifted that can non-linear enhance the ability to withstand load. Before most of plastic gear case reaching the yield or cracks, that occur deformation interference. And the 0.7 profile shifted gear case cracks appeared before it interferes.
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