短语词组短语curved face cam follower 曲面从动件flat face cam follower 平面从动件face cam driving mechanism 端面槽形凸轮传动机构face cam mechanism 槽轮机构reabout -face cam 回行凸轮flat -face cam mechanism 平面凸轮机构cam face 凸轮面cam former face 凸轮型面 返回 face cam