Patents by Inventor Gisela Ablas Marques
Gisela Ablas Marques 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: 11162586Abstract: A piston ring and a method of manufacturing a piston ring for a piston of a reciprocating internal combustion engine. The piston ring comprises a body having an outer circumferential surface. A tribological coating is formed on the outer circumferential surface of the body. The tribological coating has a dual layer or a triple layer structure and includes a relatively hard base layer and a relatively porous top layer overlying the base layer. The tribological coating may be provided with varying thickness such that its thickness increases gradually from 90° towards 0° in a first radial direction of the piston ring and from 270° towards 360° in a second radial direction of the piston ring reaching its maximum value in the region of 0° and 360°, i.e. the tips of the piston ring.Type: GrantFiled: November 30, 2018Date of Patent: November 2, 2021Inventors: Jose Valentim Lima Sarabanda, Fabio Mendes de Araujo, Gisela Ablas Marques
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Patent number: 11156291Abstract: A piston ring and a method of manufacturing a piston ring for a piston of a reciprocating internal combustion engine. The piston ring comprises a body having an outer circumferential surface. A tribological coating is formed on the outer circumferential surface of the body. The tribological coating has a dual layer or a triple layer structure and includes a relatively hard base layer and a relatively porous top layer overlying the base layer. The tribological coating may be provided with varying thickness such that its thickness increases gradually from 90° towards 0° in a first radial direction of the piston ring and from 270° towards 360° in a second radial direction of the piston ring reaching its maximum value in the region of 0° and 360°, i.e. the tips of the piston ring.Type: GrantFiled: November 30, 2018Date of Patent: October 26, 2021Inventors: Jose Valentim Lima Sarabanda, Fabio Mendes de Araujo, Gisela Ablas Marques
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Patent number: 10634248Abstract: A piston ring for a piston of an internal combustion engine may include a body composed of a ferrous material. The body may have an upper portion, a lower portion opposed to the upper portion, an internal portion configured to face towards a piston groove and an external portion opposed to the internal portion. An upper chamfer may be disposed between the upper portion and the external portion. A lower chamfer may be disposed between the lower portion and the external portion. The upper portion, the lower portion and the internal portion may each have a nitrided layer. The external portion, the upper chamfer and the lower chamfer may include at least one ion plated coating layer. The nitrided portion in at least a superficial layer may have a hardness of 700 HV or less.Type: GrantFiled: February 9, 2015Date of Patent: April 28, 2020Assignees: MAHLE METAL LEVE S/A, MEHLE INTERNATIONAL GMBHInventors: Sandra Matos Cordeiro Costa, Gisela Ablas Marques
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Publication number: 20200049252Abstract: A one piece oil control ring for an internal combustion engine may include a plurality of segments having a metal base and being operatively associated with one another. Each segment of the plurality of segments may define a superior portion and an inferior portion which may both be oriented towards an internal surface of a cylinder liner. The superior portion and the inferior portion may each have a first surface substantially parallel to the internal surface of the cylinder liner wherefrom there may extend a substantially inclined second surface. The metal base may have a tempered martensitic matrix having a hardness of 400 HV to 600 HV. A nitrided layer may be disposed upon all surfaces of each of the plurality of segments.Type: ApplicationFiled: October 5, 2017Publication date: February 13, 2020Inventors: Gisela Ablas Marques, Paulo Jose Da Rocha Mordente, Paulo Roberto Vieira De Morais
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Patent number: 10487405Abstract: A piston ring may include a stainless steel base having between 8% and 15% by weight of chromium, together with other elements and impurities, and having a hardness between 350 HV and 420 HV. The piston ring may also include a superficial nitrided layer having a depth of no more than 60 ?m and an average hardness measured upon the surface exceeding 800 HV. The nitrided layer may include a plurality of nitride particles, which may have a maximum size of 5 ?m and may be distributed over between 4% and 8% of an area of the nitrided layer.Type: GrantFiled: October 16, 2015Date of Patent: November 26, 2019Assignees: Mahle Metal Leve S/A, Mahle International GmbHInventor: Gisela Ablas Marques
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Patent number: 10247130Abstract: A wet cylinder liner for internal combustion engines may include a cylindrical body composed of a ferrous alloy having a circumferential outer surface. The cylindrical body may include a first layer and a second layer disposed sequentially on the outer surface. The first layer may include at least one of at least one silicon and at least one two-component epoxy adhesive. The second layer may include a silane-elastomer compound. The silane-elastomer compound may include nanoparticles of silicon oxide and an adhesion modifier additive. The second layer may be configured as an interface between a cooling fluid and the first layer, as well as to resist erosion by cavitation. The first layer may facilitate an interface for resistance at high temperatures.Type: GrantFiled: October 16, 2015Date of Patent: April 2, 2019Assignees: Mahle Metal Leve S/A, Mahle International GmbHInventors: Paulo Roberto Vieira De Morais, Gisela Ablas Marques
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Publication number: 20190093769Abstract: A piston ring and a method of manufacturing a piston ring for a piston of a reciprocating internal combustion engine. The piston ring comprises a body having an outer circumferential surface. A tribological coating is formed on the outer circumferential surface of the body. The tribological coating has a dual layer or a triple layer structure and includes a relatively hard base layer and a relatively porous top layer overlying the base layer. The tribological coating may be provided with varying thickness such that its thickness increases gradually from 90° towards 0° in a first radial direction of the piston ring and from 270° towards 360° in a second radial direction of the piston ring reaching its maximum value in the region of 0° and 360°, i.e. the tips of the piston ring.Type: ApplicationFiled: November 30, 2018Publication date: March 28, 2019Inventors: Jose Valentim Lima Sarabanda, Fabio Mendes de Araujo, Gisela Ablas Marques
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Publication number: 20190093768Abstract: A piston ring and a method of manufacturing a piston ring for a piston of a reciprocating internal combustion engine. The piston ring comprises a body having an outer circumferential surface. A tribological coating is formed on the outer circumferential surface of the body. The tribological coating has a dual layer or a triple layer structure and includes a relatively hard base layer and a relatively porous top layer overlying the base layer. The tribological coating may be provided with varying thickness such that its thickness increases gradually from 90° towards 0° in a first radial direction of the piston ring and from 270° towards 360° in a second radial direction of the piston ring reaching its maximum value in the region of 0° and 360°, i.e. the tips of the piston ring.Type: ApplicationFiled: November 30, 2018Publication date: March 28, 2019Inventors: Jose Valentim Lima Sarabanda, Fabio Mendes de Araujo, Gisela Ablas Marques
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Publication number: 20170327957Abstract: A piston ring may include a stainless steel base having between 8% and 15% by weight of chromium, together with other elements and impurities, and having a hardness between 350 HV and 420 HV. The piston ring may also include a superficial nitrided layer having a depth of no more than 60 ?m and an average hardness measured upon the surface exceeding 800 HV. The nitrided layer may include a plurality of nitride particles, which may have a maximum size of 5 ?m and may be distributed over between 4% and 8% of an area of the nitrided layer.Type: ApplicationFiled: October 16, 2015Publication date: November 16, 2017Inventor: Gisela Ablas Marques
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Publication number: 20170234262Abstract: A wet cylinder liner for internal combustion engines may include a cylindrical body composed of a ferrous alloy having a circumferential outer surface. The cylindrical body may include a first layer and a second layer disposed sequentially on the outer surface. The first layer may include at least one of at least one silicon and at least one two-component epoxy adhesive. The second layer may include a silane-elastomer compound. The silane-elastomer compound may include nanoparticles of silicon oxide and an adhesion modifier additive. The second layer may be configured as an interface between a cooling fluid and the first layer, as well as to resist erosion by cavitation. The first layer may facilitate an interface for resistance at high temperatures.Type: ApplicationFiled: October 16, 2015Publication date: August 17, 2017Inventors: Paulo Roberto Vieira De Morais, Gisela Ablas Marques
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Publication number: 20170016538Abstract: A piston ring for a piston of an internal combustion engine may include a body composed of a ferrous material. The body may have an upper portion, a lower portion opposed to the upper portion, an internal portion configured to face towards a piston groove and an external portion opposed to the internal portion. An upper chamfer may be disposed between the upper portion and the external portion. A lower chamfer may be disposed between the lower portion and the external portion. The upper portion, the lower portion and the internal portion may each have a nitrided layer. The external portion, the upper chamfer and the lower chamfer may include at least one ion plated coating layer. The nitrided portion in at least a superficial layer may have a hardness of 700 HV or less.Type: ApplicationFiled: February 9, 2015Publication date: January 19, 2017Inventors: Sandra Matos Cordeiro Costa, Gisela Ablas Marques
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Patent number: 8561998Abstract: This invention refers to the solution of problem of spalling of the nitrided layer in piston rings for Flex-fuel engines, without jeopardizing the wear resistance, suggesting for such purpose a nitrided piston ring (100,100?) equipped with two nitrided layers (1,2), with metallic base (3) composed mainly of iron and whose superficial hardness presented is of about 800 Vickers, decreasing in a substantially linear manner up to about 400 Vickers for a distance to the surface of up to 90 microns (?m).Type: GrantFiled: December 21, 2010Date of Patent: October 22, 2013Assignee: MAHLE International GmbHInventors: Gisela Ablas Marques, André Ferrarese, Claudinei José de Oliveira, Jan Vatavuk
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Publication number: 20130049304Abstract: This invention refers to the solution of problem of spalling of the nitrided layer in piston rings for Flex-fuel engines, without jeopardizing the wear resistance, suggesting for such purpose a nitrided piston ring (100,100?) equipped with two nitrided layers (1,2), with metallic base (3) composed mainly of iron and whose superficial hardness presented is of about 800 Vickers, decreasing in a substantially linear manner up to about 400 Vickers for a distance to the surface of up to 90 microns (?m).Type: ApplicationFiled: December 21, 2010Publication date: February 28, 2013Applicants: MAHLE INTERNATIONAL GMBH, MAHLE METAL LEVE S/AInventors: Gisela Ablas Marques, André Ferrarese, Claudinei José de Oliveira, Jan Vatavuk
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Patent number: 7891669Abstract: The invention relates to a piston ring for internal combustion engines, the piston ring comprises a steel or cast iron base material with a coating of chromium nitride deposited by a physical vapor deposition process on a sliding surface of the piston ring, wherein the coating is composed of a columnar crystal structure of CrN with the following features: (a) an oxygen content in solid solution of 0.5 to 2.5 wt %; (b) a content of uniformly dispersed micro-pores of less than 10% in volume of the coating; and (c) an X-ray diffraction intensity ratio of (111) planes to (200) planes parallel to the surface in the range of 0.80 to 1.20.Type: GrantFiled: June 16, 2007Date of Patent: February 22, 2011Assignees: Mahle International GmbH, Mahle Metal Leve S.A.Inventors: Juliano Avelar Araujo, Gisela Ablas Marques, Jose Valentim Lima Sarabanda, Robert Richard Banfield
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Patent number: 7833636Abstract: The present invention relates to a piston ring for an internal combustion engine, the piston ring comprises a sulphide rich compound layer forming a surface layer, said sulphide rich compound layer comprising an iron nitride matrix with iron sulphide (FeS) inclusions embedded in said matrix, said sulphide rich compound layer having a sulphur content of 1 to 4 wt % S and a nitrogen content of 10 to 20 wt % N.Type: GrantFiled: June 16, 2007Date of Patent: November 16, 2010Assignees: MAHLE International GmbH, MAHLE Metal Leve, S.A.Inventors: Juliano Avelar Araujo, Gisela Ablas Marques, Jose Valentim Lima Sarabanda
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Publication number: 20100001474Abstract: The present invention relates to a piston ring for an internal combustion engine, the piston ring comprises a sulphide rich compound layer forming a surface layer, said sulphide rich compound layer comprising an iron nitride matrix with iron sulphide (FeS) inclusions embedded in said matrix, said sulphide rich compound layer having a sulphur content of 1 to 4 wt % S and a nitrogen content of 10 to 20 wt % N.Type: ApplicationFiled: June 16, 2007Publication date: January 7, 2010Inventors: Juliano Avelar Araujo, Gisela Ablas Marques, Jose Valentim Lima Sarabanda
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Publication number: 20090278320Abstract: The invention relates to a piston ring for internal combustion engines, the piston ring comprises a steel or cast iron base material with a coating of chromium nitride deposited by a physical vapor deposition process on a sliding surface of the piston ring, wherein the coating is composed of a columnar crystal structure of CrN with the following features: (a) an oxygen content in solid solution of 0.5 to 2.5 wt %; (b) a content of uniformly dispersed micro-pores of less than 10% in volume of the coating; and (c) an X-ray diffraction intensity ratio of (111) planes to (200) planes parallel to the surface in the range of 0.80 to 1.20.Type: ApplicationFiled: June 16, 2007Publication date: November 12, 2009Inventors: Juliano Avelar Araujo, Gisela Ablas Marques, Jose Valentim Lima Sarabanda, Robert Richard Banfield
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Publication number: 20080136116Abstract: A piston ring for internal combustion engines with a coating of Chromium nitride (CrN) deposited by a physical vapor deposition process on a sliding surface with a typical crystal structure of CrN phase, has a high wear resistance and superior resistance to the generation of micro-cracks and consequent localized loss of pieces of the coating. The coating is a columnar crystalline coating of CrN having a dispersed pore content lower than 10% in volume and ratio of intensities, measured through x-ray diffraction, between the crystal planes (111) and planes (200), parallel to the surface, in the range of 0.40 to 0.70. This crystalline distribution is obtained through an oxygen content impregnated in the CrN coating between 1.0% in weight to 7.0% in weight. The Vickers hardness of the film ranges from 1,500 to 2,200 HV.Type: ApplicationFiled: November 29, 2007Publication date: June 12, 2008Inventors: Jose Valentim Lima Sarabanda, Robert Richard Banfield, Gisela Ablas Marques