Abstract: Contour pattern of single screw hydraulic motors is not only composed of cycloid, but also can be composed of any convex curve. Either the curve of rotor or the curve of stator can be divided into two patrs, tooth top (tooth face) and tooth root (tooth flank). Only one of the four segments is independent. If one of the four is given and the demarcating point exists, other three segments are derivable. Any convex curve has its demarcating point provided, it is located far enough from the coordinate origin. Complying with the method discussed in this paper, curves derived satisfy the contour pattern condition. Contour patterns of cycloid are special cases of the conclusion of this paper.

Key words: contour-pattern of motor, tooth top, tooth root, demarcating point, secant point

摘要： 单螺杆马达的线型不限于摆线,给定任意曲线都可以构成线型.转子曲线和定子曲线均可分为齿顶和齿根,在这四段曲线中只有一段是独立的,对其中的任一段给定任意曲线,只要离原点足够远,用包络法求出其余三段,这样得出的曲线必定满足线型条件,无需逐一证明.过去已知的摆线线型仅为本文的特例.

关键词: 马达线型, 齿顶, 齿根, 分界点, 割点