The model of gear profile curve and gear transition curve are the difficult but key point of gear 3d solid model.
齿廓曲线尤其是齿根过渡曲线的构建是渐开线圆柱齿轮三维实体建模的难点，也是其关键问题。
In this paper, an approximate method of using three tangent arcs to substitute the involute gear profile curve is put forward.
提出用圆弧来代替渐开线齿形的近似方法，实现了渐开线齿轮三维实体造型的直接编程生成技术。
The text introduces the two choices of inner gear profile curve of the rolling gear drive and the theoretical reasons of the equidistance curve of inner cycloid and the close an; curve.
论述波式滚动活齿传动内齿轮齿廓曲线的两种选择：内摆线的等距曲线、密切圆弧曲线的理论成因。
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