بررسي سفتي درگيري چرخ‌دنده‌هاي نامتقارن ساده اصلاح شده به كمك رو ش‌هاي تحليلي و اجزا محدود

Investigation of the meshing characteristics of asymmetric spur gears using analytical an‎d finite element methods

مهندسي مكانيك

Asymmetric gears are determined by having different involute profiles for the drive side an‎d coast side of their teeth. This feature makes asymmetric gears well-suited for systems where loading is mainly applied unidirectionally. Because the pressure angle differs between the two flanks, asymmetric gears can show better behavior an‎d performance than symmetric gears in certain applications. Since comprehensive information about the meshing behavior of asymmetric gears is limited, this dissertation aims to find the optimal amount of tip relief as the most common tooth profile modification an‎d to eva‎luate the effect of increasing the drive side pressure angle on the mesh stiffness, contact ratio, peak-to-peak transmission error, an‎d Hertzian stress. Two models consisting of two symmetric gears an‎d four asymmetric gears were considered an‎d the mesh stiffness is calculated for these models using both analytical an‎d finite element methods. In order to use the results of previous references for validating the present results, these models are selec‎ted from two well-established references. The gears were modeled in SOLIDWORKS, an‎d the finite element simulations were carried out in Abaqus. The results indicate that increasing the drive-side pressure angle leads to higher mesh stiffness, while reducing the contact ratio, Hertzian stress, an‎d peak-to-peak transmission error. In the subsequent step, tip relief as the most common profile modification is applied to the asymmetric gear teeth using KISSsoft. Results show that the modified asymmetric gears achieve a lower contact ratio, Hertzian stress, an‎d transmission error compared to the unmodified case. Therefore, asymmetric gears can offer better performance compared to their symmetric counterparts.

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