根据更一般的定义，环面的生成元不必是圆，而可以是椭圆或任何圆锥曲线。
分度圆环面 Reference tosoid
圆环面的母圈 Generant of the toroit
圆环面的中间平面 Middle-plane of the toroid ; mid-plane of the toroid
圆环面的内圈 Inner circle of the toroid
圆环面的中性圈 Middle circle of the toroid
圆环面的母圆 generant of the toroid
圆环面的内圆 inner circle of the toroid
蜗轮齿根圆环面 [机] root toroid of wormwheel
圆环面的中性圆 middle circle of the toroid
齿根圆环面 Root tosoid
对于任意完全包含在圆环面上的曲面，这个曲线都不是它的边界。
See, this one also does not bound anything that's completely contained in the torus.
推导了双圆环面包络环面蜗杆磨齿啮合界线方程及其与相配蜗轮啮合的啮合界线方程。
The equations of the meshing limit line in the first and second enveloping of the dual-torus double-enveloping toroidal worm drive are presented in this paper.
基于微分几何和空间啮合理论，分析了修正型圆环面双包络环面蜗杆副齿面形成原理。
Analysis of the forming principle of tooth flank of modified type worm gear pair was based on different geometry and spatial engaging theory.
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