Patents by Inventor Fabio Mendes de Araujo
Fabio Mendes de Araujo 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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Publication number: 20220090680Abstract: A piston ring includes a split annular body having an outer circumferential surface, an intermediate coating on the outer circumferential surface, a first layer on the intermediate coating, the first layer having a first hardness and a first porosity, and a second layer on the first layer, the second layer having a second hardness that is less than the first hardness, and having a second porosity that is greater than the first porosity.Type: ApplicationFiled: September 29, 2021Publication date: March 24, 2022Inventors: Jose Valentim Lima Sarabanda, Fabio Mendes de Araujo
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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: 11162585Abstract: A piston assembly for an internal combustion engine includes a cylinder bore and a piston having exactly two ring grooves, a scraper ring positioned in the upper ring groove, and an oil control ring positioned in the lower ring groove. A constant twist occurs in the scraper ring about a rotational center of the cross-section, the constant twist occurring at each cross-sectional location of the scraper ring about the circumference of the ring and between adjacent free ends of the ring. The oil control ring can be of a multi-segmented U-flex design, with a coil spring mounted in a channel thereof. The combination of the two rings leads to improved sealing and oil control so that the piston can be manufactured with only two rings, thus reducing overall weight and cost.Type: GrantFiled: January 31, 2019Date of Patent: November 2, 2021Assignee: MAHLE International GmbHInventors: Fabio Mendes De Araujo, Erich John Rabassa, Jason Bieneman, Ashfaque Ahamed
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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: 11047478Abstract: 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 structure and includes a relatively hard base layer and a relatively porous top layer overlying the base layer.Type: GrantFiled: June 2, 2017Date of Patent: June 29, 2021Inventors: Jose Valentim Lima Sarabanda, Fabio Mendes de Araujo
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Publication number: 20200248809Abstract: A piston assembly for an internal combustion engine includes a cylinder bore and a piston having exactly two ring grooves, a scraper ring positioned in the upper ring groove, and an oil control ring positioned in the lower ring groove. A constant twist occurs in the scraper ring about a rotational center of the cross-section, the constant twist occurring at each cross-sectional location of the scraper ring about the circumference of the ring and between adjacent free ends of the ring. The oil control ring can be of a multi-segmented U-flex design, with a coil spring mounted in a channel thereof. The combination of the two rings leads to improved sealing and oil control so that the piston can be manufactured with only two rings, thus reducing overall weight and cost.Type: ApplicationFiled: January 31, 2019Publication date: August 6, 2020Applicant: MAHLE International GmbHInventors: Fabio MENDES DE ARAUJO, Erich John RABASSA, Jason BIENEMAN, Ashfaque AHAMED
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Patent number: 10371086Abstract: A piston assembly for an internal combustion engine includes a cylinder bore and a piston having a plurality of ring grooves, and a ring positioned within a ring groove. The ring includes a cross-section having a lower surface and an outer radial surface that form a scraping corner, an inner radial surface, and an upper surface. The upper surface and the lower surface are generally parallel with one another, and both upper and lower surfaces form a positive first angle with respect to a radial axis, and the outer radial surface forms a second positive angle with respect to a central axis. A constant twist occurs in the ring about a rotational center of the cross-section, the constant twist occurring at each cross-sectional location of the ring about the circumference of the ring and between adjacent free ends of the ring.Type: GrantFiled: March 31, 2016Date of Patent: August 6, 2019Assignee: Mahle International GmbHInventors: Fabio Mendes de Araujo, Erich John Rabassa, Kaushik Kirana Prasad
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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: 20180347696Abstract: 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 structure and includes a relatively hard base layer and a relatively porous top layer overlying the base layer.Type: ApplicationFiled: June 2, 2017Publication date: December 6, 2018Inventors: Jose Valentim Lima Sarabanda, Fabio Mendes de Araujo
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Publication number: 20170284331Abstract: A piston assembly for an internal combustion engine includes a cylinder bore and a piston having a plurality of ring grooves, and a ring positioned within a ring groove. The ring includes a cross-section having a lower surface and an outer radial surface that form a scraping corner, an inner radial surface, and an upper surface. The upper surface and the lower surface are generally parallel with one another, and both upper and lower surfaces form a positive first angle with respect to a radial axis, and the outer radial surface forms a second positive angle with respect to a central axis. A constant twist occurs in the ring about a rotational center of the cross-section, the constant twist occurring at each cross-sectional location of the ring about the circumference of the ring and between adjacent free ends of the ring.Type: ApplicationFiled: March 31, 2016Publication date: October 5, 2017Inventors: Fabio Mendes de Araujo, Erich John Rabassa, Kaushik Kirana Prasad