Development of small torque precision loading mechanism

A kind of piezoelectric droved micro-displacement magnification mechanism with flexible hinges is developed in order to realize the requirements of precise small torque loading in the astronautics test and measurement device of the stiffness of micro-torsion bar. A precise finite element model was established upon this mechanism, and by the use of finite element method to carry out check and analysis upon the strength and magnification ratio of this mechanism. This mechanism possesses a stroke of 350 μm, a resolution factor of displacement greater than 0.25μm, and a maximum force output not less than 4N, which satisfied the requirements of test and measurement devise.