Split rudder axle device for electric servo mechanism

The invention discloses a split rudder axle device for an electric servo mechanism. The split rudder axle device for the electric servo mechanism comprises an output shaft sleeve (1), wherein a shifting fork device (2) is arranged out of the output shaft sleeve (1) in a sleeving manner, and the shifting fork device (2) is connected to the output shaft sleeve (1) through a shear force pin (3); theshifting fork device (2) is cylindrical, shifting forks (4) which are symmetrical up and down are arranged on one side of the cylinder, and a nut (5) is arranged between the shifting forks (4) which are symmetrical up and down; lifting levers (6) which are symmetrical up and down are arranged on the nut (5), and the lifting levers (6) are slidably connected to notches (7) in the shifting forks (4); and the nut (5) is arranged on a lead screw (8) in a sleeving manner. According to the split rudder axle device disclosed by the invention, mechanical properties such as torsion resistance and bending resistance of the rudd