Design of a helix-based revolute flexure hinge with large stroke

This paper develops a novel revolute flexure hinge consisting of helical spring-like structures. Thanks to the excellent deformation capability and geometric constraints of the helix structure, the developed flexure hinge achieves a large workspace (up to$\pm 150^{\circ}$rotation angles) with high accuracy (zero axis drift). The stiffness model of the flexible hinge is derived based on the elastic beam theory to illustrate the relationship between end load and hinge deformations. The characteristics of the revolute hinge are further verified by finite element simulations. Compared with the traditional revolute flexure hinge, the developed design demonstrates a higher range and accuracy of rotation, as well as better ability of preserving the center of ration position but smaller compliance.