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Effect of design parameters on stresses occurring at the tooth root in a spur gear pressed on a shaft
Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering ( IF 2.4 ) Pub Date : 2021-02-14 , DOI: 10.1177/0954408921995292
Fatih Güven 1
Affiliation  

Gears are commonly used in transmission systems to adjust velocity and torque. An integral gear or an interference fit could be used in a gearbox. Integral gears are mostly preferred as driving gear for a compact design to reduce the weight of the system. Interference fit makes the replacement of damaged gear possible and re-use of the shaft compared to the integral shaft. However, internal pressure occurs between mating surfaces of the components mated. This internal pressure affects the stress distribution at the root and bottom land of the gear. In this case, gear parameters should be re-considered to assure gear life while reducing the size of the gear. In this study, interference fitted gear-shaft assembly was examined numerically. The effects of rim thickness, profile shifting, module and fit tolerance on bending stress occurring at the root of the gear were investigated to optimize gear design parameters. Finite element models were in good agreement with analytical solutions. Results showed that the rim thickness of the gear is the main parameter in terms of tangential stress occurring at the bottom land of the gear. Positive profile shifting reduces the tangential stress while the pitch diameter of the gear remains constant. Also, lower tolerance class could be selected to moderate stress for small rim thickness.



中文翻译:

设计参数对正齿轮压在轴上时齿根上应力的影响

齿轮通常用于传动系统中以调节速度和扭矩。变速箱中可以使用整体齿轮或过盈配合。一体式齿轮最适合作为紧凑设计的驱动齿轮,以减轻系统重量。与整体轴相比,过盈配合使更换损坏的齿轮和重新使用轴成为可能。但是,内部压力发生在被配合部件的配合表面之间。该内部压力会影响齿轮根部和底面的应力分布。在这种情况下,应重新考虑齿轮参数,以确保齿轮寿命,同时减小齿轮尺寸。在这项研究中,对过盈配合的齿轮轴组件进行了数值检查。轮辋厚度,轮廓偏移,研究了齿轮的模数和齿轮根部弯曲应力的配合公差,以优化齿轮设计参数。有限元模型与解析解非常吻合。结果表明,齿轮的轮辋厚度是在齿轮底面产生的切向应力方面的主要参数。正齿廓移位减小了切向应力,而齿轮的螺距直径保持恒定。同样,对于较小的轮辋厚度,可以选择较低的公差等级以减轻应力。正齿廓移位减小了切向应力,而齿轮的螺距直径保持恒定。同样,对于较小的轮辋厚度,可以选择较低的公差等级以减轻应力。正齿廓移位减小了切向应力,而齿轮的螺距直径保持恒定。同样,对于较小的轮辋厚度,可以选择较低的公差等级以减轻应力。

更新日期:2021-02-15
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