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A theoretical and experimental analysis is conducted to study the influences of key design parameters on the backlash of the roller enveloping hourglass worm gear. Two equations, the gear engagement equation and the tooth profile equation have been derived and represented in terms of four key parameters arising from the backlash of the worm gear by applying the gear meshing theory. Based on the derived equations, an efficient approach for reducing or eliminating the backlash of such a novel warm gear is developed. Specifically, the influences of center distance, roller radius, transmission ratio, and the radius of base circle on the contact curves and the tooth profile have been systematically investigated through numerical analysis, modeling and simulation. Next, a roller enveloping hourglass worm gear is manufactured and used for assessing the efficiency of the developed method in reducing and/or eliminating the backlash.

This paper focus on creating simplified models for plate-like automotive parts which can be used for crashworthiness analysis. Other than the traditional ways that used shell elements with coarse meshing to model plate-like parts for a simplified vehicle model, this paper tried to use superelement and equivalent beam methods to re-model such parts. In this paper, both methods are presented separately and two simplified chassis models are generated applying the two methods. The efficiency of the developed simplified models as well as the presented modeling methods are evaluated and compared through crashworthiness analyses, and finally positive results are achieved.