Step-down transmission for driving a plurality of extrusion screws
AssigneeMaplan Maschinen- und technische Anlagen, Planungs- und Fertigungs-Gesellschaft mbH
InventorRudolf Zahradnik
Life of this patent
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Abstract
A step-down transmission for driving a plurality of extrusion screws from a common power source comprises a main shaft, directly connected with one screw and coupled with the source via a reduction gearing, and one or more pairs of corotating ancillary shafts coupled with the main shaft via gear trains each including a cylindrical gear in mesh with two spur gears respectively keyed to the shafts of the corresponding pair. The paired ancillary shafts carry helical gears in mesh with a common pinion on a shaft of another screw closely adjoining and possibly intermeshing with the first-mentioned screw.
Claims8
In an extruder provided with a plurality of parallel extrusion screws, including a first screw and at least one other screw coacting therewith, and a common source of motive power for jointly rotating said extrusion screws,
- the combination therewith of a step-down transmission inserted between said source and said extrusion screws, said transmission comprising:
- reduction gearing driven by said source including a primary spur gear on a main shaft directly and coaxially connected with said first screw;
- a satellite gear in driving engagement with said primary spur gear centered on an axis parallel to said main shaft;
- a pair of ancillary shafts paralleling said main shaft and carrying respective secondary spur gears of like tooth number in mesh with said satellite gear;
- a pinion axially offset from said primary spur gear on an output shaft, paralleling said main shaft, directly and coaxially connected with said coacting screw;
- and
- a pair of driven gears of like tooth number on said ancillary shafts in mesh with said pinion for rotating said coacting screw in unison with said first screw.
Dependencies are inferred from the claim text.