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首次提出渐开螺旋面点接触逆式外啮合，论述了其啮合的几何原理．给出了基本几何关系式、压力角公式，对应点方程．
For the first time, the involute spiral surface point contact reverse external meshing is proposed, and the geometric principle of meshing is discussed. The basic geometric relation, pressure angle formula and corresponding point equation are given.