分别推导得到齿面平移距离和内凹齿面母线方程的计算公式。

Formula to evaluate translation of the tooth-surface and the equation to describe the generatrix of the negatively cambered sooth-surface were derived respectively.

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推导了进入双点啮合区的法面啮合角公式，采取了独特的剃齿刀修形方式，从设计和修形上下功夫杜绝剃齿中凹的产生。

And the normal engagement angle of approaching double-point tooth area is deduced. The special dressing method of shaving cutter has been adopted.

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