By CAD and gear mesh theory, mathematical model of mesh between the two spiral rotors is educed, and the tooth model line of the five segments with excellent peculiarities is designed.

• 利用计算机辅助设计理论和齿轮啮合理论推导出螺旋转子啮合的数学模型,设计出五段型线齿型,并对之进行了理论研究和设计计算。