在避免蜗杆“根切”和“变尖”的条件下,减小蜗杆的喉径,提高蜗轮付的啮合效率及蜗轮轮齿强度,改善其结构的不合理性,已成为当前对“多头小速比”包络弧面蜗杆传动啮合原理研究的重要课题。本文对一种新型包络弧面蜗杆传动——“球面二次包络弧面蜗杆传动”进行了系统的理论研究,所得的结论表明,采用该传动对解决上述问题可以获得十分令人满意的结果。 In the condition of avoiding “undercuts” and “sharpening” of the worm screw, reducing the throat diameter of the worm, improving the meshing efficiency of the worm gear and the strength of the gear of the worm wheel and improving the irrationality of the structure thereof has become the current issue of “ Speed ​​ratio ”enveloping arc worm gear meshing principle of the important issues. In this paper, a new type of envelope arc worm drive - “spherical double enveloping worm drive” was systematically studied. The results obtained show that the use of the drive to solve the above problems can be very satisfactory result.