关键词: 转子;圆弧端齿;联轴器;装配定位

Abstract: In order to obtain the design and evaluation methods of positioning precision of curvic coupling， the positioning mechanism of curvic coupling was theoretically studied. The elastically averaged positioning method and its positioning principle adopted by curvic coupling were expounded. Common misunderstandings in structure design by elastically averaged positioning were analyzed， and the key influencing factors were pointed out. Through the force analysis of curvic coupling， the mechanism of structural parameters of tooth surface effect on concentric positioning were revealed， the necessary conditions for centering requirements were pointed out， and the statically indeterminate model derived from curvic coupling was constructed according to its structure characteristics. By using balance equations of the statically indeterminate model and deformation compatibility condition， the coaxial and concentric deviation calculation methods of curvic coupling were derived， and the calculation examples of the location deviation were given. The results show that assembly force and elastic compensation are the key factors of elastically averaged positioning. Positioning structures should ensure that contact surfaces can produce effective elastic compensation under the action of assembly force; the axial deviation and concentric deviation of the coupling are affected by the stiffness of the single tooth， and the change rate of axial deviation gradually increased with the increase of the number of adjacent teeth.

Key words: Rotor;Curvic coupling;Couplings;Assembly positioning