There is only approximate way to work out the normal chordal tooth thickness of wormandwormwheel at present.
目前所见到的圆柱蜗杆蜗轮分度圆弦齿厚计算公式均为近似公式。
2
On the basis of the first envelope, the paper stresses on the tooth contact analysis of the second envelope, and the equations of a wormand a wormwheel flanks are derived.