# US 2019/0170238 A1 · Spur gear transmission > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0170238 A1 - Document ID: US20190170238A1 - Status: Published application - Kind: A1 - Application number: 16/205,569 - Filed: 2018-11-30 - Published: 2019-06-06 - Earliest claimed: 2016-06-01 - Assignees: Voith Patent GmbH - Applicants: Voith Patent GmbH - Inventors: Steffen Kämmerer; Matthias Rauch; Marco Shneider - Web page: https://patentgrep.com/patent/US20190170238A1 ## CPC - F16H 57/0409: {characterised by increasing efficiency, e.g. by reducing splash losses} - F16H 1/06: with parallel axes - F16H 57/027: characterised by means for venting gearboxes, e.g. air breathers - F16H 57/029: characterised by means for sealing the gearboxes, e.g. to improve airtightness - F16H 57/032: characterised by the materials used - F16H 57/0412: {Cooling or heating; Control of temperature} - F16H 57/0423: {Lubricant guiding means mounted or supported on the casing, e.g. shields or baffles for collecting lubricant, tubes or pipes} - F16H 57/0431: {Means for guiding lubricant directly onto a tooth surface or to foot areas of a gear, e.g. by holes or grooves in a tooth flank} - F16H 57/0454: {Sealings between different partitions of a gearing or to a reservoir (means for sealing gearboxes F16H57/029)} - F16H 57/0495: {with fixed gear ratio} - F16H 2057/02078: {for wind turbines} - F16H: GEARING ## Abstract The invention relates to a spur gear transmission with at least two intermeshing spur gears the teeth of which are in meshing engagement with one another, and each of which are rotatable via an axis of rotation. The spur gear transmission has an enveloping wall which surrounds the two spur gears in circumferential direction and in the direction of the axes of rotation. The enveloping wall has an inner contour which is adapted to the outer diameter of the spur gears in such a manner that two annular gaps which merge into each other are formed between the enveloping wall and the spur gears. One annular gap respectively is arranged at least substantially concentrically with respect to a respective axis of rotation. The enveloping wall is formed by a two-part housing which is closed along a parting line and which has an upper part and a lower part. ## Claims ### Claim 1 A spur gear transmission, comprising: at least two intermeshing spur gears having a plurality of teeth, the plurality of teeth of each in a meshing engagement with one another, and rotatable via a respective axis of rotation; an enveloping wall surrounding the at least two intermeshing spur gears in a circumferential direction and in a direction of the respective axis of rotation, the enveloping wall having an inner contour adapted to an outer diameter of the at least two intermeshing spur gears thereby forming two annular gaps between the enveloping wall and the at least two intermeshing spur gears merging into each other, at least one of the two annular gaps is substantially concentric to the respective axis of rotation, the enveloping wall being formed by a two-part housing which is closed along a parting line and includes an upper part and a lower part, the parting line extends at least partially within a plane in which at least one of the respective axis of rotation extending, at least one of the at least upper part and lower part of the enveloping wall are a welded construction. ### Claim 2 (depends on 1) The spur gear transmission according to claim 1, wherein the upper part and the lower part are detachably joined along the parting line. ### Claim 3 (depends on 1) The spur gear transmission according to claim 1, wherein at least one of the upper part and the lower part are a welded sheet steel. ### Claim 4 (depends on 1) The spur gear transmission according to claim 1, wherein the upper part encloses at least one half of a common outside circumference of the at least two intermeshing spur gears as a single component. ### Claim 5 (depends on 1) The spur gear transmission according to claim 1, wherein the spur gear transmission includes a transmission housing having an interior space filled with an air-lubrication mixture and the at least two intermeshing spur gears and the enveloping wall are located in the interior space, wherein the at least two intermeshing spur gears are arranged in the interior space above an oil sump at a distance to the oil sump. ### Claim 6 (depends on 5) The spur gear transmission according to claim 5, wherein the transmission housing is manufactured from steel or a steel alloy. ### Claim 7 (depends on 1) The spur gear transmission according to claim 1, wherein at least one sealing element is connected to the enveloping wall, the at least one sealing element at least partially seals at least one annular gap, the at least one sealing element being produced from a softer material than at least one of the upper part and the lower part. ### Claim 8 (depends on 1) The spur gear transmission according to claim 1, wherein the lower part includes an opening that exposes a section of the circumference of at least one of the at least two intermeshing spur gears, the opening directed downward relative to the respective axis of rotation. ### Claim 9 (depends on 8) The spur gear transmission according to claim 8, wherein the opening in the circumferential direction of the at least two intermeshing spur gears is sealed on both sides with the at least one sealing element on at least one of the at least two intermeshing spur gears. ### Claim 10 (depends on 7) The spur gear transmission according to claim 7, wherein the at least one sealing element is produced from aluminum. ### Claim 11 (depends on 7) The spur gear transmission according to claim 7, wherein the at least one sealing element is configured to adjust in a radial direction. ### Claim 12 (depends on 1) The spur gear transmission according to claim 1, wherein at least one temperature measuring point is provided on the enveloping wall. ### Claim 13 (depends on 1) The spur gear transmission according to claim 1, wherein a lubricating oil supply provides a lubricating oil stream onto the plurality of teeth of the at least two intermeshing spur gears. ### Claim 14 (depends on 1) The spur gear transmission according to claim 1, wherein the enveloping wall is liquid-cooled. ### Claim 15 (depends on 14) The spur gear transmission according to claim 14, wherein liquid cooling of the enveloping wall is accomplished with a cooling medium stream that is at least one of being guided over the enveloping wall and through the enveloping wall, the cooling medium stream being independently adjustable from the lubricating oil stream. ### Claim 16 (depends on 1) The spur gear transmission according to claim 1, wherein at least one of the upper part and the lower part includes two side walls arranged opposite one another and enclosing at least part of the at least two intermeshing spur gears in an axial direction between them. ### Claim 17 (depends on 1) The spur gear transmission according to claim 1, wherein the upper part of the enveloping wall includes a plurality of axial openings in a region of the two annular gaps. ### Claim 18 (depends on 5) The spur gear transmission according to claim 5, wherein between the outside circumference of the enveloping wall and an upper housing half of the transmission housing a plurality of sheet metal elements extend in a radial direction onto the transmission housing forming at least three axially adjacent channel sections. ### Claim 19 (depends on 18) The spur gear transmission according to claim 18, wherein the enveloping wall includes a plurality of radial openings in a region of the at least three axially adjacent channel sections.