Abstract: With the development of precision engineering, flexure mechanisms are more and more applied in many fields. The increasing of application requirements call for development of a variety of flexure mechanisms, especially high performance ones. Under the direction of screw theory, a graphic configuration synthesis method based on the complementary rule of freedom and constraint is proposed to synthesize parallel flexure mechanisms. This method is visual and has a definite physical meaning. The synthesis chart of 2R1T and 3R parallel flexure mechanisms is presented as an illustration. In order to verify the characteristic of freedom, a principal freedom analysis method aiming at the practical flexible constraint is also proposed. The analysis of a 2R1T parallel flexure mechanism is implemented, and the influence of structure parameters on the mechanism characteristic compliance is given through the analysis.

Key words: Configuration synthesis, Graphic, Principal freedom analysis, Screw