关键词: 马达线型, 齿顶, 齿根, 分界点, 割点

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