# US 7,607,818 B2 · Extruder with gear pump > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,607,818 B2 - Document ID: US7607818B2 - Status: Granted - Kind: B2 - Application number: 12/032,863 - Filed: 2008-02-18 - Published: 2008-08-21 - Granted: 2009-10-27 - Earliest claimed: 2007-02-16 - Assignees: VMI-AZ Extrusion GmbH - Inventors: Reinhard Uphus - Web page: https://patentgrep.com/patent/US7607818B2 ## CPC - F04C 11/006: {having complementary function} - B29C 48/07: Flat, e.g. panels - B29C 48/37: Gear pumps - B29C 48/387: {using a screw extruder and a gear pump} - B29C 48/52: with an outer diameter varying along the longitudinal axis, e.g. for obtaining different thread clearance - B29C 48/53: having a varying channel depth, e.g. varying the diameter of the longitudinal screw trunk - F04C 3/04: of intermeshing engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing - F04C 15/06: Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) ## Abstract An extruder for viscous masses, and including an extruder screw and a positive-displacement gear pump disposed downstream of the extruder screw as viewed in the conveying direction. The positive-displacement gear pump has at least one conveying gear and at least one positive-displacement gear. The axis of the conveying gear is disposed essentially at right angles to the axis of the extruder screw, and the axis of the positive-displacement gear is disposed essentially in the same direction as the axis of the extruder screw. ## Claims ### Claim 1 An extruder for viscous masses, comprising: an extruder screw (12); and a positive-displacement gear pump (20) disposed downstream of said extruder screw (12) as viewed in a conveying direction, wherein said positive-displacement gear pump (20) is provided with at least one conveying gear (22, 222) and at least one positive-displacement gear (32), further wherein an axis (23) of said at least one conveying gear (22, 222) is disposed essentially at right angles to an axis (13) of said extruder screw (12), and wherein an axis (33) of said at least one positive-displacement gear (32) is disposed essentially in the same direction as said axis (13) of said extruder screw (12), wherein said at least one conveying gear (22,222) and said at least one positive-displacement pear (32) are embodied as bevel gears that mesh with one another. ### Claim 2 (depends on 1) An extruder according to claim 1, wherein said at least one conveying gear (22, 222) or said at least one positive-displacement gear (32) is designed as a crown gear and said at least one positive-displacement gear (32) or said at least one conveying gear (22, 222) is embodied as a bevel gear. ### Claim 3 (depends on 1) An extruder according to claim 1 wherein said axis (33) of said at least one positive-displacement gear (32) is disposed at right angles to said axis (23) of said at least one conveying gear (22, 222). ### Claim 4 (depends on 1) An extruder according to claim 1, wherein said axis (33) of said at least one positive-displacement gear (32) is disposed at an acute angle to said axis (23) of said at least one conveying gear (22, 222). ### Claim 5 (depends on 1) An extruder according to claim 1, wherein said at least one conveying gear (22, 222) and said at least one positive-displacement gear (32) are embodied as helical gears. ### Claim 6 (depends on 5) An extruder according to claim 5, wherein said at least one positive-displacement gear (32) is embodied as a screw and said at least one conveying gear (22, 222) as a screw gear. ### Claim 7 (depends on 1) An extruder according to claim 1, wherein said at least one positive-displacement gear (32) and said extruder screw (12) are coaxially disposed. ### Claim 8 (depends on 1) An extruder according to claim 1, wherein said at least one positive-displacement gear (32) is frictionally connected with said extruder screw (12). ### Claim 9 (depends on 1) An extruder according to claim 1, wherein said at least one positive-displacement gear (32) is provided with a drive that is independent of said extruder screw (12). ### Claim 10 (depends on 1) An extruder according to claim 1, wherein a further conveying gear (222) is arranged on a side of said extruder screw (12) that is remote from said at least one conveying gear (22), and wherein said further conveying gear (222) also meshes with said at least one positive-displacement gear (32). ### Claim 11 (depends on 1) An extruder according to claim 1, wherein a plurality of conveying gears (22, 222) are disposed on the periphery of said extruder screw (12). ### Claim 12 (depends on 1) An extruder according to claim 1, wherein said extruder screw (12) is provided with an extension (14) that extends into a region of said at least one conveying gear (22, 222). ### Claim 13 (depends on 12) An extruder according to claim 12, wherein said extension (14) extends to said at least one positive-displacement gear (32). ### Claim 14 (depends on 1) An extruder according to claim 1, wherein two extruder screws (12) are disposed parallel to one another in a housing (11) of said extruder, and wherein said two extruder screws (12) are adapted to simultaneously supply respective mass flows to said positive-displacement gear pump (20). ### Claim 15 (depends on 1) An extruder according to claim 1, wherein two extruder screws (12) are provided that converge in a housing (11) of said extruder in a direction toward said positive-displacement gear pump (20), and wherein said two extruder screws (12) are adapted to simultaneously supply respective mass flows to said positive-displacement gear pump (20). ### Claim 16 (depends on 1) An extruder according to claim 1, wherein two extruder screws (12) are disposed in a housing (11) of said extruder and are adapted to simultaneously supply respective mass flows to said positive-displacement gear pump (20), and wherein one or two positive-displacement gear pinions, which mesh with a conveying crown gear, are associated eccentrically with said two extruder screws (12). ### Claim 17 (depends on 16) An extruder according to claim 16, wherein at least one of said positive-displacement gear pinions is adapted to be driven directly or via an intermediate gear by one or both extruder screws (12) and meshes with said conveying crown gear. ### Claim 18 (depends on 1) An extruder according to claim 1, wherein a housing (21) of said positive-displacement gear pump (20) is integrated into an extruder housing (11) of said extruder.