Patent ID: 7967590

Claim:
An injection unit for an injection moulding machine, comprising: a screw cylinder ( 1 ); a plasticizing screw ( 2 ) which can be driven therein axially and rotatably, the drive unit ( 3 ) of which has an electric drive motor ( 4 ), a drive assembly comprising a spindle drive ( 5 ) coupled to the screw ( 2 ) for the axial movement of the screw ( 2 ), and a rotary drive ( 6 ) arranged coaxially with the spindle drive ( 5 ) and allowing an axial displacement of the screw ( 2 ) for the rotational movement of the screw ( 2 ); a differential gearing ( 7 ), which is arranged between the drive motor ( 4 ) and the drive assembly, said differential gearing ( 7 ) having a differential cage ( 8 ), two driven gears ( 11 , 12 ) and at least one compensating gear ( 19 , 20 ) in between, wherein the drive motor ( 4 ) is drive-coupled to the differential cage ( 8 ), wherein one driven gear ( 11 ) of the differential gearing ( 7 ) is output-coupled to the spindle nut ( 14 ) of the spindle drive ( 5 ), wherein the other driven gear ( 12 ) of the differential gearing ( 7 ) is output-coupled to the rotary drive ( 6 ) of the screw ( 2 ), wherein the driven gears ( 11 , 12 ) or the downstream spindle nut ( 14 ) and rotary drive ( 6 ) can be loaded by a respective controllable spindle brake and rotary brake ( 21 , 22 ), and wherein the functional movements of the screw ( 2 ) can be controlled by a matched intervention of the spindle brake ( 21 ) on the spindle nut ( 14 ) and rotary brake ( 22 ) on the rotary drive ( 6 ).