独特的凸凹啮合齿廓，使两齿轮在接触点处的综合曲率半径较大。
The special meshing of convex and concave teeth profile makes the relative radius of curvature of the contacting point longer.
对中心轮理论廓线的曲率和曲率半径进行了解析，并由此确定中心轮实际齿廓避免顶切条件约束。
Curvature and radius of curvature of central wheel are solved and non end cutting conditions of actual profile of central wheel are deduced.
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