基圆渐开线涡旋盘齿根综合应力集中系数的确定

Determination of concentration coefficient of synthetic stress at roots of scroll wrap in form of circle involute

分析涡旋齿根应力集中的主要影响因素,建立涡旋齿根应力集中的等效几何模型,在不考虑涡旋齿面质量影响的前提下,以齿根应力疲劳缺口系数和形状变化系数综合形成涡旋齿根综合应力集中系数,并基于机械设计手册数据拟合得到涡旋齿根综合应力影响系数的简化计算公式,实例说明计算结果与对应几何模型从《机械设计手册》中查取的结果吻合较好.

Main influencing factor on the stress concentration at the roots of scroll wrap was analyzed and an equivalent geometric model of this stress concentration was set up. On the premise of ignoring the surface quality of the scroll wrap, a concentration coefficient of synthetic stress at the root of scroll wrap was synthetically constituted according to fatigue notch coefficient and shape variation coefficient of the wrap roots and a simplified evaluation formula of influencing coefficient of the synthetic stress was also obtained by means of data-fitting presented in ＂Machine Design Manual＂. It was shown by an actual illustrative computation that its result was well consistent with that looked up in machine design manual.