ELECTRIC MOTOR-OPERATED LINEAR AND ROTARY ACTUATOR

摘要

The invention relates to an electric motor-operated linear and rotary actuator, particularly for plasticizing screws of injection molding machines. In an injection unit for an injection molding machine, comprising an electric single-motor drive (4) for the plasticizing screw (2) including a spindle drive (16) that operates between the rotor (7) of the drive motor and the motor housing (3), and comprising a number of selectively actuated switching elements (20, 21, 24) for switching the single-motor drive between a screw rotating drive and a screw stroke drive. According to the invention, the power demands placed on the drive motor and the loads placed on the linear guides required for the stroke movement are distinctly reduced due to the fact that the rotor, together with the plasticizing screw and the spindle drive gearing element (17) that is rotationally driven by the rotor, is mounted so that it can undergo a stroke movement relative to the motor housing, and one of the stator-side or rotor-side magnetic pole arrangements (6) is lengthened with regard to the other (9) so that it corresponds to the stoke path of the rotor.