primary great circle 基准大圆
The basic parameters of non-circular gear are determined, such as primary circle, eccentricity ratio, eccentricity throw and proportional coefficient of center distance.
确定了非圆齿轮的基本参数：基础圆半径、偏心率、变形距和中心距比例系数。
The polar equation of non-circular gear pitch curve, calculation method of center distance, formula of pitch curve length, primary circle radius and pressure Angle is given.
给出了非圆齿轮的节曲线极坐标方程，两齿轮中心距的计算方法，节曲线长度、基础圆半径和压力角的计算公式。
In other cases, a spherical model is used, and the primary distance calculation used is the great-circle distance (see Resources).
在其他情况下使用球面模型，所使用的主要距离计算为大圆弧长(参见参考资料)。
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