The invention discloses a
servo motor connecting mode, which belongs to the technical field of a large-scale closed type pressing
machine and adopts a
crankshaft, a hollow shaft
servo motor, an expansion connecting sleeve and an upper
transverse beam, wherein the hollow shaft
servo motor is directly and fixedly connected with the
crankshaft through the expansion connecting sleeve, an inner tooth sleeve seat and an outer tooth motor seat are also adopted, the outer tooth motor seat is in inner engagement connection with the inner tooth sleeve seat, and the inner tooth sleeve seat is fixedly arranged on the upper
transverse beam. The hollow shaft servo motor can realize the position limitation in the circumferential direction, so the torque is provided for the
crankshaft, in addition, the outer tooth top of the outer tooth motor seat is made into an
ellipsoid surface, in addition, inner and outer teeth have the proper top gap and the side gap, the axial and
radial displacement and the
angular displacement of the outer tooth motor seat can be allowed, the servo motor and the outer tooth motor seat of the servo motor realize the flexible connection with the inner tooth sleeve seat, and the micro torsion bending deformation of the crankshaft can be automatically adapted at any time in the
punching process, so the reliability and the
punching precision of the servo motor are improved, the service life of the servo motor is prolonged, and the production cost is reduced.