Patent ID: 7811080

Claim:
An injection unit, in particular for an injection molding machine, comprising a plastication screw which is guided in a plastication cylinder in a rotatable and axially movable manner and via which plastic material undergoes plastication and can be injected into a tool cavity, wherein the plastication screw is driven via a screwed drive that is operably connected to an electric drive including an electric motor, the screwed drive being operatively connected to a support cylinder such that the support cylinder supports the screwed drive and the plastication screw, and wherein the support cylinder includes a pressure chamber to which dynamic and/or support pressure can be applied during plastication and injection, characterized in that the electric motor is coupled to a hydrostatic machine which during plastication is driven by the pressure medium displaced from the pressure chamber and which during injection conveys pressure medium into the pressure chamber so as to build up support pressure, and wherein a brake is allocated to a spindle of the screwed drive.