齿轮历史_叼着烟斗的教授_新浪博客 开线齿轮的许多细节尺寸，其订定过程也经过一番折腾。比方说，攸关齿的大小，有模数（Module, M）与径节（Diameter pitch, D.P.）两种描述法。D.P.的产生，是Willis为了避免节圆（Pitch diameter）变成无理数，因
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Mean normal diameter pitch 中点法向径节
pitch diameter [机] 节圆直径 ; [机] 节径 ; 中径 ; 分度圆直径
pitch diameter of roller set [机] 滚子组的节圆直径 ; 球组的节圆直径
variational diameter-pitch spiral 变径距螺旋
pitch diameter of ball set 球组的节圆直径 ; [机] 球组节圆直径
pitch circle diameter 节圆直径 ; 电极圆直径 ; 装配节圆直径 ; 分度圆直径
Diameter pitch threads number and range D. p.
径节螺纹种数与范围。
Bolt circle diameter and pitch between bolt holes.
螺栓圆周直径及螺栓孔间距。
This article brings to Light the internal relations and difference between single pitch diameter and actual pitch diameter by means of geometrical analysis of several parameters of pitch diameter.
通过对普通螺纹中径诸参数的几何分析，揭示出其单一中径与实际中径的内在联系与区别。
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