If the normal section in the center of the tooth line is taken as a tooth measuring and design section, when spline hob is designed in a plane meshing, the tooth profile error is minimum.

如果以齿纹中点法剖面作为齿形检测和设计剖面，用平面啮合法设计花键滚刀时，则齿形误差最小。

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The new tooth surface can be prolonged by the normal profile of the internal toroidal surface, or replaced by an equal pitch helical surface.

其二为一种修整的线接触，展成的等螺距齿面与理论轨迹曲面沿某一空间曲线近似相切。

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Meanwhile obtained the tooth profile equation of pin-track by the tooth profile normal law which matched the inviolate-cycloid compound gear.

同时利用齿廓法线法得出与该复合齿轮相配套的销轨齿廓方程。

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