并且证明，法面双圆弧齿轮的每一段端面齿廓都是对应椭圆曲线段在相对运动中的包络曲线。
Moreover, the extreme shape of the normal double circle gearing proves to be the involved curve of the corresponding ellipse.
为此，郑州机械研究所针对低速重载齿轮传动领域设计了ZY-1型硬齿面双圆弧齿轮齿形。
Aiming at heavy duty and low speed gear transmission, Zheng Zhou Research Institute of Mechanical Engineering puts forwards ZY-1 case- hardened double-circular-arc gear.
然而，我国对硬齿面双圆弧齿轮传动承载能力及可靠性的研究尚属起步。
However, research on loading capacity and reliability of this kind gear is still at initial stage.
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