Patent ID: 7942567
Filing Date: 2011-05-17
Classification: B29C,F04C

Abstract:
1. An extruder system with a gear pump, comprising an extruder for axially extruding a rubber or plastic material in a barrel by rotation of an extrusion screw arranged in the barrel, and a gear pump driven by a rotational force for rotating the extrusion screw so that a predetermined amount of the material extruded from the extruder is discharged by engagement of gears, wherein: the gear pump comprises the gear casing comprises the rotational shaft of the at least one driven pinion is fixedly secured to the side plates; the side plates include a side plate situated on the suction side adjacent to the extrusion screw and a side plate situated on the discharge side remote from the extrusion screw, the side plate on the suction side having a suction port that is arranged opposite to that side of an engagement region between the driving pinion and the at least one driven pinion, where teeth of the driving pinion and the at least one driven pinion are being disengaged from each other, and the side plate on the discharge side having a discharge port that is arranged opposite to that side of the engagement region between the driving pinion and the at least one driven pinion, where the teeth of the driving pinion and the at least one driven pinion are being engaged from each other, the suction port and the discharge port being maintained out of an axial communication with each other by the driving pinion and the at least one driven pinion, and the casing body further comprises a plurality of recesses positioned at each axial end of at least one of the plurality of axial opening portions, the plurality of recesses being partially non-overlapping with the suction port and the discharge port.