它是外花键的齿根圆，和内花键的内圆(齿顶圆)。
It is the root circle of the external spline or the inside circle (tooth tip circle) of the internal spline.
它是外花键的外圆(齿顶圆)，和内花键的齿根圆。
It is the outside circle (tooth tip circle) of the external spline or the root circle of the internal spline.
传动部分是渐开线齿轮，工作部分可采用不同的工作面，如圆柱外圆面或圆弧形齿或渐开线齿轮齿顶修圆。
The transmission part is an involute gear, and the working part can adopt different working faces, such as a cylinder excircle face, a circular arc tooth or an involutes tooth gear top cavetto.
传动部分是渐开线齿轮，工作部分可采用不同的工作面，如圆柱外圆面或圆弧形齿或渐开线齿轮齿顶修圆。
The transmission part is an involute gear, and the working part can adopt different working faces, such as a cylinder excircle face, a circular arc tooth or an involutes tooth gear top cavetto.
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