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。

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Involute CAM is an important attachment which produce involute profile in the copying gear grinder; the accuracy of which directly decide the profile accuracy of gear which is grinded.

渐开线凸轮是靠模式齿轮磨床生成渐开线齿形的重要附件，其精度直接决定着被磨齿轮的齿形精度。

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Early in 1971, we installed an experimental single circular-arc-profile gear in a 2400Hp pass- enger-cargo ship instead of an involute gear for the first time.

1971年起，我们首先在2400马力客货轮中采用单圆弧齿轮（不必磨齿）代替渐开线齿轮，使用到现在情况良好。

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