遠とお退のき弧こ

noun

arc of recess (gear)

A technical term in gear design referring to the portion of the pitch circle where a pair of gear teeth are disengaging after contact.

• 歯は車ぐるまの設せっ計けいでは、遠とお退のき弧この長ながさが騒そう音おんに影えい響きょうする。

  In gear design, the length of the arc of recess affects noise.