Performance Evaluation of Low- and High-Contact Ratio Spur Gears: Dynamic Response and Bending Strength
Tóm tắt
High-contact ratio gears are very important components for power transmission systems as they increase the load-carrying capacity of the gear wheel as well as reduce the dynamic loads and accordingly low vibration and noise. However, it has been observed that there are very few studies in the literature investigating the dynamic performance of high-contact spur gears at different operating speeds and calculating tooth root stress. The main purpose of this study is to investigate the dynamic responses of high-contact spur gears at different operating speeds and the resulting in their bending durabilities. Another purpose of this study is to examine the performance of high-contact spur gears at different speeds compared to low-contact spur gears. Within the scope of the study, first, time-varying mesh stiffness of low- and high-contact ratio spur gears was calculated numerically. Dynamic models of gears with lumped parameters were obtained with the help of developed MATLAB programs. Structural analyses were performed with the obtained time-varying mesh stiffness and dynamic forces, and the bending strength performances of low- and high-clutch spur gears were compared. As a result of the analysis, it has been observed that spur gears with high-contact ratio are exposed to approximately 40% lower dynamic forces than spur gears with low-contact ratios. In addition, due to the double–triple contact behavior, it has been observed that spur gears with high-contact ratio have about twice the load-carrying capacity of spur gears with a low-contact ratio. The results obtained in the study showed that high-contact ratio spur gears would be highly efficient in applications requiring high load-carrying capacity. The high-contact ratio spur gears have low operating vibration, noise, and dynamic transmission error when compared to the low-contact spur gears.
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