根据非圆齿轮节曲线的特点和计算方法 ,提出了一种只需要非圆齿轮节曲线上的离散点 ,就可以用具有统一表达式的分段三次样条曲线代替表达式形式各异的非圆齿轮节曲线。利用拟合后的非圆齿轮节曲线 ,就可以使得所有非圆齿轮加工数据的计算有了通用的计算模块。最后用椭圆齿轮节曲线弧长计算过程 ,说明了该方法不仅精度非常高 ,而且计算方法简单和通用。 According to the characteristics and calculation methods of non-circular gear pitch curves, a new method is proposed, which only uses the discrete points on the curve of non-circular gear pitch, and can use the piecewise cubic spline curve with unified expression instead of different non-circular expressions Cogwheel curve. Using the fitted non-circular gear section curve, all non-circular gear machining data can be calculated with a common calculation module. Finally, using the elliptic gear section curve arc length calculation process shows that the method is not only very high accuracy, but also simple and universal calculation method.