ROTATIONAL ACTUATOR

摘要

A perfected rotational actuator, comprising, in two box-shaped shells (31, 32), a pair of plates (12, 13) connected to each other by a central pin (14) and containing, between the same, a plurality of pulleys (25), with two superimposed perimetric slots (29), in which a shape memory alloy wire (21) circulates, wherein two segments of said wire (21) are arranged in aligned slots (29) of the pulleys (25) and are constrained at opposite ends to non-conductive elements (19) integral with a tooth (16) protruding radially from a plate (12) and in a position shifted by a certain angle (?) with respect to each other, the two segments of wire being defined by passage through a further non-conductive element (20) integral with a tooth (17) radially protruding from the second plate (13), a torque spring (23) situated on the central pin (14) being interposed between the plates (12, 13), the opposite ends of the wire (21) being connected to an electric wire (22), radial arms (34, 35) of each of the shells (31, 32) being connected to elements to which the rotation movement is to be transmitted.