US 4,399,719 AGranted

Twin screw extruder with power branching gearing

AssigneeHermann Berstorff Maschinenbau GmbH

InventorsSiegfried Chszaniecki, Wilhelm Brand

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Abstract

Each screw shaft of a twin screw extruder with power branching gearing is driven by a gear train comprising a driven pinion, a first pair of intermediate gears meshing with the driven pinion from opposite sides, a second pair of intermediate gears each meshed with a respective one of the first pair of intermediate gears and a drive pinion meshed on its opposite sides with the second pair of intermediate gears and coupled to a power shaft. The first and second pairs of intermediate gears are capable only of rotation in a gear casing in which they are mounted but the drive pinion and the driven pinion are capable of radial movement in the casing. As shown the driven pinion has an axial extension with curved teeth engaged in one end of a coupling sleeve with internal curved teeth and a portion of the shaft has curved teeth engaged with the curved teeth in the other end of the sleeve, the shaft being mounted in bearings.

Claims2

Dependent claims

An extruder with twin screws and associated output drive shafts, and power branching gearing for driving said output drive shafts, comprising:

(a) a gear casing;
(b) a driven pinion drivably connected to one of said output drive shafts;
(c) a first pair of intermedate gears of the same size and disposed opposite one another in engagement with said driven pinion, and means for mounting said first pair of intermediate gears in said gear casing such that said intermediate gears are capable only of rotational movement in said casing;
(d) a drive pinion drivably connected to an operating shaft for imparting torque to said gearing;
(e) a second pair of intermediate gears of the same size and disposed opposite one another in engagement with said drive pinion, and means for mounting said second pair of intermediate gears in said gear casing such that said gears are capable only of rotational movement in said casing;
(f) a first gear of said first pair of intermediate gears engaging a first gear of said second pair of intermediate gears on one side of a line through the axes of said drive and driven pinions;
(g) a second gear of said first pair of intermediate gears engaging a second gear of said second pair of intermediate gears on the opposite side of said line, and
(h) means for mounting said drive pinion and said driven pinion for radial movement, relative to the axes of said pinions, in said gear casing,
thereby providing uniform power transmission to said pinions and said output drive shafts.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/241,518Filed 9 Mar 1981
Priority: DE 300939812 Mar 1980
Granted: 23 Aug 1983
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

F16H 1/22
Involving more than two intermeshing members: with a plurality of driving or driven shafts; with arrangements for dividing torque between two or…
B29C 48/252
Component parts, details or accessories; Auxiliary operations: drive or actuation means; Transmission means; Screw supporting means
B30B 11/241
Using screws or worms: drive means therefor; screw bearings
B29C 48/03
Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor:…

Family

No related US applications are recorded in the indexed filing history.

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