Abstract: A new type of rotary actuator for driving the wing control surface has been studied. The mechanism of thereverse ball screw transforms directly the straight movement of the oil cylinder to rotation movement . The researchindicates that the new type of actuator has the advantages of bigger output torque, smaller diameter, less weight,and more generally applicable and standardized compared with the existing actuators.

Key words: rotary actuator, mechanism of driving wing control surface, reverse ball screw