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计算平面二次包络环面蜗杆副的接触线长度和了解蜗轮齿面接触区域的大小是蜗杆传动强度分析的基础。运用空间啮合原理等知识和数值积分的方法计算了蜗杆副接触线总长度，并提出了接触线总长变动因数的概念，求出了齿面实际接触区域的大小
Calculating the length of contact line of planar secondary enveloping worm and understanding the size of the contact area of worm gear is the basis of worm transmission strength analysis. The total length of the contact line of the worm pair is calculated by using the knowledge of the space engagement principle and the numerical integral method. The concept of the change factor of the total length of the contact line is proposed and the actual contact area of the tooth surface is obtained