定义 描述螺旋特性的数据，包括螺旋的直径、螺距及倾斜角等。
并推导出了单丝长度与螺旋参数相关的数学计算式，其计算结果与实际相一致。
Onthe other hand, the mathematic formulae are derived for single-wire length as a funclion of the helical parameters, and the results of calculation and the actual data are consistent with each other.
以135型三螺杆泵为例，对螺杆几何参数设计、螺旋型面的形成、螺杆啮合特性进行了探讨。
By taking 135 three-screw pump as an example, the geometric parameter design, the forming of spiral surface and the characteristic of screw gearing are investigated.
本文应用画法几何投影变换方法来研究瞬时螺旋运动有关构造、位移等参数之间的几何关系。
In this paper, the method of geometric transformation is used to search the relationship between the parameters of construction and the displacement of the flop.
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