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.
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。
Besides, the relationship between the tooth shape and the helix Angle, and the number of teeth are studied.
分析了端面齿廓形状与螺旋角及齿数的关系。
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