초록 ▼

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 tra

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.

대표청구항 ▼

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

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.