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pitch line 【機械工程】齒距線。

pitch man

The directrixes of the in former two transmissions are the loxodrome and the geodesic on the pitch cones , that of the latter is an equal - pitch line along the direction of straight generatrixes in the hyperboloid surface , also is the vertical trajectory of the straight generatrixes 前兩種傳動形式的準線分別為節錐面上的斜航線與測地線,后者的準線為單葉雙曲面上沿直母線方向的等螺距曲線,且為直母線族的正交軌線。