Twin Screw Extruder For Drive System

A twin screw extruder drive system includes a pair of parallel juxtaposed output shafts each of which is fixed to a sun gear of a planetary gear set

. Each gear set includes a plurality of planet idler gears which are only rotatable about their axes and engage both the sun gear and a ring gear. Symmetrically disposed about the circumference of the ring gear are at least two drive pinions. The two gear sets have parallel axes and are axially offset from one another with the output shafts extending through a space between the planet gears of the other gear set. In one embodiment each drive pinion is driven by a separate electric motor and all motors are electronically and mechanically speed synchronized. A single electric motor is employed to drive all drive pinions in an alternate configuration.

A drive system suitable for a twin screw extruder having a pair of adjacent parallelaxis extruder screws, the drive system including two adjacent parallel axis output shafts, each engageable with one of the twin extruder screw and separate gear train means for driving each output shaft, the gear train means having parallel axes which areadjacent one another, one gear train means being spaced axially behind the other gear train means, each gear train means including a planetary gear set, each planetary gear set comprising a ring gear, a plurality of drive pinions, means journalling thedrive pinions for rotation about fixed axes, the drive pinions being in driving engagement with the ring gear, the drive pinions being equidistantly spaced from one another along the periphery of the ring gear, each planetary gear set further including aplurality of planet gears and a sun gear, the planet gears being equidistantly spaced from one another along the periphery of the ring gear, means journalling each planet gear for rotation about a fixed axis, the sun gear axes of the two planetary gearsets being adjacent and parallel to one another and means interconnecting the sun gear of each gear set with one of the output shafts whereby relatively high driving torques are provided.

A drive system suitable for driving a twin screw extruder as constructed in accordance with claim 1 further including bearing-free means for supporting the ring gear for rotation about the axis of the sun gear, the bearing-free supportingmeans comprising the engagement between the ring gear and the planet gears.

A drive system suitable for a twin screw extruder as constructed in accordance with claim 1 further including separate electric motor means in driving engagement with each drive pinion.

by: ericfu

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