关键词: 插齿, 非圆齿轮, 干涉, 液压马达

Abstract: The mechanism of cutting interference is deeply analyzed when shaping non-circular gear by using three-shaft NC gear shaper，a new method letting the gyration center of the gear shaper deviate its geometric center to avoid this interference and also keep a continuous cutting process is put forward．Finally，an actual example when shaping the internal tooth of the hydraulic motor with non-circular planetary gear is given，which demonstrates the realization strategy and the correlative algorithm of the method．

Key words: Hydraulic motor, Non-circular gear, Gear shaping, Interference