prolate involute
... 圆心渐开线involute to a circle 延伸渐开线prolate involute 螺旋面helicoid ...
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... 延伸率：elongation rate 延伸渐开线：involutes extend 延度测量法：ductilimetry ...
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讨论通过变径蜗杆来实现延伸渐开线圆柱蜗杆的点啮合的方法。
The way of point engagement for extending involute cylinder worm being accomplished by the varying diametral worms is discussed in this paper.
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