Patents by Inventor Lars Stigsjöö
Lars Stigsjöö has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10704596Abstract: A toroidal roller bearing that provides an inner ring, an outer ring and a plurality of roller elements interposed in-between the inner and outer rings such that the rings rotate relative each other in relation to a rotational axle. The bearing is configured such that the inner ring and the outer ring are capable of being axially displaced and angularly misaligned relative each other in relation to the rotational axle. At least one of the inner or outer ring provides a recess in an axially extending section extending from one of its axial ends. The recess is arranged such that an axial gripping force can be generated onto the ring. In addition, the present disclosure provides a bearing arrangement that includes the bearing.Type: GrantFiled: March 22, 2018Date of Patent: July 7, 2020Assignee: AKTIEBOLAGET SKFInventors: Linus Efraimsson, Prakash Gowdra Leelachandrappa, Kishor Powar, Gajula Balija Ranga, Lars Stigsjöö, Vijay Tijare
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Patent number: 10247234Abstract: A spherical roller bearing having a specific pitch circle diameter (PCD) that includes an outer ring, an inner ring, a plurality of roller elements arranged in first and second roller rows, each roller element providing an axially inner end, and a cage for guiding the roller elements in the first and second roller row, the cage having a plurality of cage pockets. One of the roller elements disposed within each cage pocket. Each respective cage pocket has a bottom that faces the axially inner end of the roller element in each cage pocket. A radially inner end of the cage pocket bottom contacts the axially inner end of the roller element only at a location radially equal to the specific PCD, the cage pocket bottom angled such that the cage pocket bottom abuts the axially inner end of the roller element at an angle such the contact is not flush.Type: GrantFiled: September 14, 2017Date of Patent: April 2, 2019Assignee: Aktiebolaget SKFInventors: Marcus Loof, Peter James, Lars Stigsjöö
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Patent number: 10197094Abstract: A double-row spherical roller bearing, comprising: an outer ring having an radially inner spherical raceway and a radially outer peripheral surface, an inner ring having a radially outer curved-shaped raceway, and roller elements arranged in two axially displaced rows. The outer ring includes an outer peripheral surface first circumferential groove. The first circumferential groove has an axial outer peripheral surface width X fulfilling the following relation: L1?X?L2, L2 extends between first end point (intersecting the first normal vector and the outer peripheral surface) and second outer peripheral surface axial end points (intersecting a second normal vector and the outer peripheral surface). The first normal vector is an inverted normal vector of the outer raceway. The second normal vector is an inverted normal vector of the inner raceway. L1 has a length of L2*?. End points of L1 are located equidistant to each respective first and second end point of L2.Type: GrantFiled: December 15, 2015Date of Patent: February 5, 2019Assignee: Aktiebolaget SKFInventors: Emma Bjorkman, Peter James, Marcus Loof, Lars Stigsjöö
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Publication number: 20180298944Abstract: A toroidal roller bearing that provides an inner ring, an outer ring and a plurality of roller elements interposed in-between the inner and outer rings such that the rings rotate relative each other in relation to a rotational axle. The bearing is configured such that the inner ring and the outer ring are capable of being axially displaced and angularly misaligned relative each other in relation to the rotational axle. At least one of the inner or outer ring provides a recess in an axially extending section extending from one of its axial ends. The recess is arranged such that an axial gripping force can be generated onto the ring. In addition, the present disclosure provides a bearing arrangement that includes the bearing.Type: ApplicationFiled: March 22, 2018Publication date: October 18, 2018Inventors: Linus Efraimsson, Prakash Gowdra Leelachandrappa, Kishor Powar, Gajula Balija Ranga, Lars Stigsjöö, Vijay Tijare
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Patent number: 10001164Abstract: A double-row spherical roller bearing, comprising an outer ring including at least one spherical inner raceway on a radially inner peripheral surface, an inner ring including a first and second axial end and at least one outer raceway on a radially outer peripheral surface. Spherical roller elements are located in first and second roller rows interposed in-between the inner and outer raceways. A first flange is located at the first axial end, extending in a circumferential direction of the outer peripheral surface. The inner ring is subjected to an axial load in a first axial direction wherein the first flange approaches the first roller row. An axial extension of the first flange extends without contacting any first roller row roller elements during bearing operation, when an axial load is acting on the inner ring in the first axial direction. The bearing can be integrated into a wind turbine.Type: GrantFiled: January 6, 2016Date of Patent: June 19, 2018Assignee: AKTIEBOLAGET SKFInventors: Emma Bjorkman, Peter James, Marcus Loof, Lars Stigsjöö
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Patent number: 10001168Abstract: A bearing arrangement for low speed rotating machinery includes a shaft and at least one double row spherical roller bearing supporting the shaft. The bearing has an inner ring providing a radially outer circumferential surface having a first and a second inner raceway and an annular portion separating the first and second inner raceway in an axial direction. An outer ring provides a radially inner circumferential surface with at least one outer raceway. Spherical rollers are located in a first and a second roller row, the first and second roller row disposed between the at least one outer raceway and the first and second respective inner raceway. A cage has a central portion located between the roller rows. The central portion provides a radially inner circumferential surface and axial protrusions to separate at least two rollers in one of the first and second rollers rows.Type: GrantFiled: April 6, 2016Date of Patent: June 19, 2018Assignee: AKTIEBOLAGET SKFInventors: Marcus Loof, Peter James, Lars Stigsjöö, Emma Bjorkman
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Publication number: 20180017103Abstract: A spherical roller bearing having a specific pitch circle diameter (PCD) that includes an outer ring, an inner ring, a plurality of roller elements arranged in first and second roller rows, each roller element providing an axially inner end, and a cage for guiding the roller elements in the first and second roller row, the cage having a plurality of cage pockets. One of the roller elements disposed within each cage pocket. Each respective cage pocket has a bottom that faces the axially inner end of the roller element in each cage pocket. A radially inner end of the cage pocket bottom contacts the axially inner end of the roller element only at a location radially equal to the specific PCD, the cage pocket bottom angled such that the cage pocket bottom abuts the axially inner end of the roller element at an angle such the contact is not flush.Type: ApplicationFiled: September 14, 2017Publication date: January 18, 2018Inventors: Marcus Loof, Peter James, Lars Stigsjöö
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Patent number: 9863471Abstract: A spherical roller bearing is provided having an outer ring that includes at least one inner raceway, an inner ring that includes a first and a second outer raceway, a plurality of roller elements disposed in a first and second roller row between the at least one inner raceway and the first and second outer raceway, a cage for one of guiding and retaining the roller elements in the first and second roller row, the cage includes a plurality of cage pockets, in which one of the plurality pf rollers is disposed within each cage pocket. The bearing further provides a specific pitch circle diameter (PCD), and when the cage is under-pitch roller centered in relation to the pitch circle diameter (PCD). In addition, a bearing arrangement and a wind turbine bearing arrangement is disclosed.Type: GrantFiled: April 6, 2016Date of Patent: January 9, 2018Assignee: AKTIEBOLAGET SKFInventors: Marcus Loof, Peter James, Lars Stigsjöö
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Patent number: 9850942Abstract: A spherical roller bearing including an outer ring providing at least one inner raceway, an inner ring providing a first and a second outer raceway, a plurality of roller elements arranged in a first and second roller row between the at least one inner raceway and the first and second outer raceway, a cage for at least one of guiding and retaining the roller elements in the first and second roller row. The cage provides a plurality of cage pockets, wherein one of the roller elements is disposed within each one of the plurality of cage pocket. The bearing further provides a specific pitch circle diameter (PCD), and the cage is over-pitched roller centered in relation to the pitch circle diameter (PCD). In addition, a bearing arrangement is disclosed.Type: GrantFiled: April 4, 2016Date of Patent: December 26, 2017Assignee: AKTIEBOLAGET SKFInventors: Marcus Loof, Peter James, Lars Stigsjöö
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Patent number: 9829038Abstract: A spherical roller bearing providing an outer ring having at least one inner raceway, an inner ring including a first and a second outer raceway, a plurality of roller elements arranged in a first and second roller row in-between the at least one inner raceway and the respective first and second outer raceway. The bearing includes a cage for retaining the roller elements in the rows. The cage provides a plurality of cage pockets where roller element is disposed in each. The cage is arranged such that; during operation, a loaded zone of the bearing is located at a radial top region of the bearing, the cage is roller centered on the axially inner ends of the roller elements, and when, during operation, a loaded zone is located at a radial bottom region of the bearing, the cage is under-pitch roller centered in relation to a pitch circle diameter (PCD).Type: GrantFiled: April 4, 2016Date of Patent: November 28, 2017Assignee: AKTIEBOLAGET SKFInventors: Marcus Loof, Peter James, Lars Stigsjöö
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Patent number: 9797440Abstract: The present disclosure regards a spherical roller bearing having, an outer ring providing at least one inner raceway, an inner ring providing a first and a second outer raceway, a plurality of roller elements arranged in a first and second roller row disposed between the at least one inner raceway and the respective first and second outer raceway, the roller elements further providing axially inner ends. Moreover, the bearing includes a cage for one of guiding and retaining the roller elements in the first and second roller row, the cage including a plurality of cage pockets, wherein one of the roller elements is disposed within each cage pocket, and wherein the cage is roller centered by the axially inner ends.Type: GrantFiled: April 5, 2016Date of Patent: October 24, 2017Assignee: AKTIEBOLAGET SKFInventors: Marcus Loof, Peter James, Lars Stigsjöö
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Patent number: 9732793Abstract: A spherical roller bearing having an outer ring providing at least one inner raceway, an inner ring providing a first and a second outer raceway, a plurality of roller elements arranged in a first and second roller row in-between the at least one inner raceway and the respective first and second outer raceway is provided. The bearing provides a cage for guiding the roller elements in the first and second roller row, the cage includes a plurality of cage pockets, wherein in each cage pocket one of the roller elements is disposed. The bearing further presents a specific pitch circle diameter (PCD), and the cage is essentially in-pitch roller centered in relation to the pitch circle diameter (PCD) when there is an axial force acting on the bearing. In addition, the present invention regards a bearing arrangement and a wind turbine bearing arrangement.Type: GrantFiled: April 4, 2016Date of Patent: August 15, 2017Assignee: AKTIEBOLAGET SKFInventors: Marcus Loof, Peter James, Lars Stigsjöö
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Publication number: 20160298685Abstract: A spherical roller bearing having an outer ring providing at least one inner raceway, an inner ring providing a first and a second outer raceway, a plurality of roller elements arranged in a first and second roller row in-between the at least one inner raceway and the respective first and second outer raceway is provided. The bearing provides a cage for guiding the roller elements in the first and second roller row, the cage includes a plurality of cage pockets, wherein in each cage pocket one of the roller elements is disposed. The bearing further presents a specific pitch circle diameter (PCD), and the cage is essentially in-pitch roller centered in relation to the pitch circle diameter (PCD) when there is an axial force acting on the bearing. In addition, the present invention regards a bearing arrangement and a wind turbine bearing arrangement.Type: ApplicationFiled: April 4, 2016Publication date: October 13, 2016Applicant: Aktiebolaget SKFInventors: Marcus Loof, Peter James, Lars Stigsjöö
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Publication number: 20160298683Abstract: The present disclosure regards a spherical roller bearing having, an outer ring providing at least one inner raceway, an inner ring providing a first and a second outer raceway, a plurality of roller elements arranged in a first and second roller row disposed between the at least one inner raceway and the respective first and second outer raceway, the roller elements further providing axially inner ends. Moreover, the bearing includes a cage for one of guiding and retaining the roller elements in the first and second roller row, the cage including a plurality of cage pockets, wherein one of the roller elements is disposed within each cage pocket, and wherein the cage is roller centered by the axially inner ends.Type: ApplicationFiled: April 5, 2016Publication date: October 13, 2016Applicant: Aktiebolaget SKFInventors: Marcus Loof, Peter James, Lars Stigsjöö
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Publication number: 20160298688Abstract: A bearing arrangement for low speed rotating machinery includes a shaft and at least one double row spherical roller bearing supporting the shaft. The bearing has an inner ring providing a radially outer circumferential surface having a first and a second inner raceway and an annular portion separating the first and second inner raceway in an axial direction. An outer ring provides a radially inner circumferential surface with at least one outer raceway. Spherical rollers are located in a first and a second roller row, the first and second roller row disposed between the at least one outer raceway and the first and second respective inner raceway. A cage has a central portion located between the roller rows. The central portion provides a radially inner circumferential surface and axial protrusions to separate at least two rollers in one of the first and second rollers rows.Type: ApplicationFiled: April 6, 2016Publication date: October 13, 2016Applicant: Aktiebolaget SKFInventors: Marcus Loof, Peter James, Lars Stigsjöö, Emma Bjorkman
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Publication number: 20160298686Abstract: A spherical roller bearing including an outer ring providing at least one inner raceway, an inner ring providing a first and a second outer raceway, a plurality of roller elements arranged in a first and second roller row between the at least one inner raceway and the first and second outer raceway, a cage for at least one of guiding and retaining the roller elements in the first and second roller row. The cage provides a plurality of cage pockets, wherein one of the roller elements is disposed within each one of the plurality of cage pocket. The bearing further provides a specific pitch circle diameter (PCD), and the cage is over-pitched roller centered in relation to the pitch circle diameter (PCD). In addition, a bearing arrangement is disclosed.Type: ApplicationFiled: April 4, 2016Publication date: October 13, 2016Applicant: Aktiebolaget SKFInventors: Marcus Loof, Peter James, Lars Stigsjöö
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Publication number: 20160298678Abstract: A spherical roller bearing providing an outer ring having at least one inner raceway, an inner ring including a first and a second outer raceway, a plurality of roller elements arranged in a first and second roller row in-between the at least one inner raceway and the respective first and second outer raceway. The bearing includes a cage for retaining the roller elements in the rows. The cage provides a plurality of cage pockets where roller element is disposed in each. The cage is arranged such that; during operation, a loaded zone of the bearing is located at a radial top region of the bearing, the cage is roller centered on the axially inner ends of the roller elements, and when, during operation, a loaded zone is located at a radial bottom region of the bearing, the cage is under-pitch roller centered in relation to a pitch circle diameter (PCD).Type: ApplicationFiled: April 4, 2016Publication date: October 13, 2016Applicant: Aktiebolaget SKFInventors: Marcus Loof, Peter James, Lars Stigsjöö
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Publication number: 20160298687Abstract: A spherical roller bearing is provided having an outer ring that includes at least one inner raceway, an inner ring that includes a first and a second outer raceway, a plurality of roller elements disposed in a first and second roller row between the at least one inner raceway and the first and second outer raceway, a cage for one of guiding and retaining the roller elements in the first and second roller row, the cage includes a plurality of cage pockets, in which one of the plurality pf rollers is disposed within each cage pocket. The bearing further provides a specific pitch circle diameter (PCD), and when the cage is under-pitch roller centered in relation to the pitch circle diameter (PCD). In addition, a bearing arrangement and a wind turbine bearing arrangement is disclosed.Type: ApplicationFiled: April 6, 2016Publication date: October 13, 2016Applicant: Aktiebolaget SKFInventors: Marcus Loof, Peter James, Lars Stigsjöö
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Patent number: 9416817Abstract: The invention relates to an assembly providing a crankshaft having a shaft section that is rotationally supported by a rolling element bearing having an outer ring that is radially divided into two ring halves. To reduce friction and accommodate misalignment, the invention proposes that the bearing which supports the shaft section is a toroidal roller bearing.Type: GrantFiled: December 19, 2012Date of Patent: August 16, 2016Assignee: AKTIEBOLAGET SKFInventors: Yannick Baubet, Peter Knight, Martines Maria Josef Noordman, Lars Stigsjöö
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Publication number: 20160201720Abstract: A double-row spherical roller bearing, comprising an outer ring including at least one spherical inner raceway on a radially inner peripheral surface, an inner ring including a first and second axial end and at least one outer raceway on a radially outer peripheral surface. Spherical roller elements are located in first and second roller rows interposed in-between the inner and outer raceways. A first flange is located at the first axial end, extending in a circumferential direction of the outer peripheral surface. The inner ring is subjected to an axial load in a first axial direction wherein the first flange approaches the first roller row. An axial extension of the first flange extends without contacting any first roller row roller elements during bearing operation, when an axial load is acting on the inner ring in the first axial direction. The bearing can be integrated into a wind turbine.Type: ApplicationFiled: January 6, 2016Publication date: July 14, 2016Applicant: Aktiebolaget SKFInventors: Emma BJORKMAN, Peter JAMES, Marcus LOOF, Lars STIGSJÖÖ