渐开线锥形齿轮由于同时存在锥度和螺旋角，使得其固定弦齿厚无法精确测量，也没有公法线。
There is no common normal in the conical involute gear and the fixed chordal tooth thickness can not be measured accurately because of the coexistence of helix angle and taper.
分析双渐开线齿轮的螺旋角系数和接触线系数，提出了新型齿轮弯曲应力的计算公式。
The arithmetic for bbending be of DIGLST is Presented after the coefficients of helix angle and contact lines are analyzed by 3-D FEM.
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