在总结分析传统弧面分度凸轮机构和平面、柱面包络蜗杆分度凸轮机构的基础上，提出了一种球面包络蜗杆分度凸轮、钢球、嵌装钢球的分度盘三体式结构的新型球面包络蜗杆分度凸轮机构；并介绍了其结构形式，推导了分度盘上球面齿廓方程，啮合方程，球面包络蜗杆分度凸轮廓面方程，最后指出了这种新型球面包络蜗杆分度凸轮机构优良的结构特性。 On the basis of summarizing and analyzing the traditional arc indexing cam mechanism and plane and cylinder enveloping indexing cam mechanism, a spherical enveloping worm indexing cam, steel ball, Body structure of the new type of spherical enveloping worm indexing cam mechanism; and introduced its structure, derivation of the indexing ball on the profile equation, meshing equation, spherical envelope indexing cam profile equations, and finally pointed out that this New spherical envelope worm indexing cam mechanism excellent structural characteristics.