Patents by Inventor Makoto Kajiwara

Makoto Kajiwara 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).

  • Publication number: 20220090558
    Abstract: Provided is a combined oil ring that can provide reduction in oil consumption of the engine oil without degrading the oil sealing performance between the lower surface of the side rail and the lower surface of the oil ring groove even when the tension of the combined oil ring is reduced.
    Type: Application
    Filed: January 31, 2020
    Publication date: March 24, 2022
    Applicant: NIPPON PISTON RING CO., LTD.
    Inventors: Masahiro UCHIUMI, Kenji ARAI, Kazuhiro SAMESHIMA, Makoto KAJIWARA, Hajime ANDO
  • Publication number: 20220003316
    Abstract: To provide a piston ring for an internal combustion engine, particularly a second compression ring, which has excellent wear resistance and can achieve both lower fuel consumption and efficient combustion. The above-described problem is solved by a piston ring (1) for an internal combustion engine formed so as to have a tapered shape by a peripheral surface (14) that gradually projects outward from a top to a bottom, and a radial cross-sectional shape of a Napier ring.
    Type: Application
    Filed: October 31, 2019
    Publication date: January 6, 2022
    Applicant: NIPPON PISTON RING CO., LTD.
    Inventors: Kyoichi IKEYA, Ofuyu SAKAI, Makoto KAJIWARA
  • Patent number: 10330198
    Abstract: A multi-piece oil ring includes an oil ring main member in which two rails are connected together by a columnar part and which has a roughly I-shaped cross section; and a coil expander disposed in an inner circumferential groove formed on the inner circumferential surface of the columnar. Each rail in the oil ring main member possesses a sliding section protuberance whose tip possesses a jutting portion. The axial length of the jutting portion is 0.02-0.18 mm. The change rate of the axial length of the individual jutting portion is in the range of 0 to 80% at least in a region of from its sliding surface to be faced to a cylinder, which is positioned at the tip of the jutting portion, to a position of 0.03 mm away from the aforementioned sliding surface in the radial direction of the oil ring main member.
    Type: Grant
    Filed: June 22, 2018
    Date of Patent: June 25, 2019
    Assignee: NIPPON PISTON RING CO., LTD.
    Inventors: Atsushi Chiba, Kazuhiro Fujimura, Iwao Hiraishi, Makoto Kajiwara
  • Publication number: 20180363778
    Abstract: A multi-piece oil ring includes an oil ring main member in which two rails are connected together by a columnar part and which has a roughly I-shaped cross section; and a coil expander disposed in an inner circumferential groove formed on the inner circumferential surface of the columnar. Each rail in the oil ring main member possesses a sliding section protuberance whose tip possesses a jutting portion. The axial length of the jutting portion is 0.02-0.18 mm. The change rate of the axial length of the individual jutting portion is in the range of 0 to 80% at least in a region of from its sliding surface to be faced to a cylinder, which is positioned at the tip of the jutting portion, to a position of 0.03 mm away from the aforementioned sliding surface in the radial direction of the oil ring main member.
    Type: Application
    Filed: June 22, 2018
    Publication date: December 20, 2018
    Inventors: Atsushi Chiba, Kazuhiro Fujimura, Iwao Hiraishi, Makoto Kajiwara
  • Patent number: 10030772
    Abstract: A multi-piece oil ring includes an oil ring main member in which two rails are connected together by a columnar part and which has a roughly I-shaped cross section; and a coil expander disposed in an inner circumferential groove formed on the inner circumferential surface of the columnar. Each rail in the oil ring main member possesses a sliding section protuberance whose tip possesses a jutting portion. The axial length of the jutting portion is 0.02-0.18 mm. The change rate of the axial length of the individual jutting portion is in the range of 0 to 80% at least in a region of from its sliding surface to be faced to a cylinder, which is positioned at the tip of the jutting portion, to a position of 0.03 mm away from the aforementioned sliding surface in the radial direction of the oil ring main member.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: July 24, 2018
    Assignee: NIPPON PISTON RING CO., LTD.
    Inventors: Atsushi Chiba, Kazuhiro Fujimura, Iwao Hiraishi, Makoto Kajiwara
  • Patent number: 9506138
    Abstract: The second compression ring is formed such that the outer peripheral surface shape has a tapered face, and the radial cross-sectional shape is a rectangular ring, a scraper ring, or a Napier ring, and has a piston ring base and a hard film provided at least on an outer peripheral sliding surface thereof. The piston ring base is composed of a low-alloy steel or carbon steel having a Vickers hardness of Hv 350 Hv 550. The outer peripheral sliding surface is formed so that the axial length is from 0.01 to 0.30 mm between the outer edge end part of the tapered outer peripheral sliding surface and an imaginary line contacting with a lower end surface where a curved surface having a diameter that decreases gradually inward from the outer edge end part toward the lower end in the axial direction is parallel to a ring underside.
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: November 29, 2016
    Assignee: Nippon Piston Ring Co., Ltd.
    Inventors: Hiroyuki Sugiura, Atsushi Chiba, Makoto Kajiwara, Kazuhiro Fujimura, Katsuaki Ogawa, Kazuhiro Sameshima
  • Patent number: 9464717
    Abstract: Provided is a piston ring such that it is possible to sufficiently inhibit adhesive wear when the piston ring is mounted to a piston for a diesel engine in which at least the piston ring groove in the piston is formed from steel or cast iron. Disclosed is a piston ring mounted to a piston for a diesel engine, wherein the load length ratio (Rmr2) (in accordance with JIS B0601:2001) of the top surface and bottom surface of the piston ring satisfies each of the following conditions: Rmr2 (0.5%, 0.3[mu]m)=20% and Rmr2 (0.5%, 0.4[mu]m)=40%.
    Type: Grant
    Filed: January 28, 2011
    Date of Patent: October 11, 2016
    Assignee: NIPPON PISTON RING CO., LTD.
    Inventors: Michihiro Ito, Naoyuki Akimoto, Iwao Hiraishi, Makoto Kajiwara, Atsushi Chiba
  • Publication number: 20150225836
    Abstract: The second compression ring is formed such that the outer peripheral surface shape has a tapered face, and the radial cross-sectional shape is a rectangular ring, a scraper ring, or a Napier ring, and has a piston ring base and a hard film provided at least on an outer peripheral sliding surface thereof. The piston ring base is composed of a low-alloy steel or carbon steel having a Vickers hardness of Hv 350 Hv 550. The outer peripheral sliding surface is formed so that the axial length is from 0.01 to 0.30 mm between the outer edge end part of the tapered outer peripheral sliding surface and an imaginary line contacting with a lower end surface where a curved surface having a diameter that decreases gradually inward from the outer edge end part toward the lower end in the axial direction is parallel to a ring underside.
    Type: Application
    Filed: April 23, 2015
    Publication date: August 13, 2015
    Inventors: Hiroyuki SUGIURA, Atsushi CHIBA, Makoto KAJIWARA, Kazuhiro FUJIMURA, Katsuaki OGAWA, Kazuhiro SAMESHIMA
  • Patent number: 8820750
    Abstract: A high-quality internal combustion engine oil ring which stably keeps oil consumption low for a long period and in which the shapes of an upper rail and a lower rail can be formed at low cost with high accuracy. The internal combustion engine oil ring has a recessed stepped portion formed at a corner of a sliding surface of an outer peripheral sliding projection in sliding contact with a cylinder inner wall surface of at least one of a first rail and a second rail constituting an oil ring main body, in a shape in vertical cross-section along a sliding direction of the first rail and second rail, and a wall surface of the recessed stepped portion has an arcuate surface having a radius of curvature of 0.02 mm to 0.08 mm.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: September 2, 2014
    Assignee: Nippon Piston Ring Co., Ltd.
    Inventors: Atsushi Chiba, Kazuhiro Fujimura, Iwao Hiraishi, Makoto Kajiwara
  • Publication number: 20130328274
    Abstract: The second compression ring is formed such that the outer peripheral surface shape has a tapered face, and the radial cross-sectional shape is a rectangular ring, a scraper ring, or a Napier ring, and has a piston ring base and a hard film provided at least on an outer peripheral sliding surface thereof. The piston ring base is composed of a low-alloy steel or carbon steel having a Vickers hardness of Hv 350 Hv 550. The outer peripheral sliding surface is formed so that the axial length is from 0.01 to 0.30 mm between the outer edge end part of the tapered outer peripheral sliding surface and an imaginary line contacting with a lower end surface where a curved surface having a diameter that decreases gradually inward from the outer edge end part toward the lower end in the axial direction is parallel to a ring underside.
    Type: Application
    Filed: February 27, 2012
    Publication date: December 12, 2013
    Applicant: NIPPON PISTON RING CO., LTD.
    Inventors: Hiroyuki Sugiura, Atsushi Chiba, Makoto Kajiwara, Kazuhiro Fujimura, Katsuaki Ogawa, Kazuhiro Sameshima
  • Publication number: 20130181410
    Abstract: A high-quality internal combustion engine oil ring which stably keeps oil consumption low for a long period and in which the shapes of an upper rail and a lower rail can be formed at low cost with high accuracy. The internal combustion engine oil ring has a recessed stepped portion formed at a corner of a sliding surface of an outer peripheral sliding projection in sliding contact with a cylinder inner wall surface of at least one of a first rail and a second rail constituting an oil ring main body, in a shape in vertical cross-section along a sliding direction of the first rail and second rail, and a wall surface of the recessed stepped portion has an arcuate surface having a radius of curvature of 0.02 mm to 0.08 mm.
    Type: Application
    Filed: March 31, 2011
    Publication date: July 18, 2013
    Applicant: NIPPON PISTON RING CO., LTD
    Inventors: Atsushi Chiba, Kazuhiro Fujimura, Iwao Hiraishi, Makoto Kajiwara
  • Publication number: 20130043659
    Abstract: Provided is a piston ring such that it is possible to sufficiently inhibit adhesive wear when the piston ring is mounted to a piston for a diesel engine in which at least the piston ring groove in the piston is formed from steel or cast iron. Disclosed is a piston ring mounted to a piston for a diesel engine, wherein the load length ratio (Rmr2) (in accordance with JIS B0601:2001) of the top surface and bottom surface of the piston ring satisfies each of the following conditions: Rmr2 (0.5%, 0.3[mu]m)=20% and Rmr2 (0.5%, 0.4[mu]m)=40%.
    Type: Application
    Filed: January 28, 2011
    Publication date: February 21, 2013
    Applicant: NIPPON PISTON RING CO., LTD.
    Inventors: Michihiro Ito, Naoyuki Akimoto, Iwao Hiraishi, Makoto Kajiwara, Atsushi Chiba
  • Publication number: 20120261886
    Abstract: A multi-piece oil ring includes an oil ring main member in which two rails are connected together by a columnar part and which has a roughly I-shaped cross section; and a coil expander disposed in an inner circumferential groove formed on the inner circumferential surface of the columnar. Each rail in the oil ring main member possesses a sliding section protuberance whose tip possesses a jutting portion. The axial length of the jutting portion is 0.02-0.18 mm. The change rate of the axial length of the individual jutting portion is in the range of 0 to 80% at least in a region of from its sliding surface to be faced to a cylinder, which is positioned at the tip of the jutting portion, to a position of 0.03 mm away from the aforementioned sliding surface in the radial direction of the oil ring main member.
    Type: Application
    Filed: March 26, 2010
    Publication date: October 18, 2012
    Applicant: NIPPON PISTON RING CO., LTD.
    Inventors: Atsushi Chiba, Kazuhiro Fujimura, Iwao Hiraishi, Makoto Kajiwara
  • Patent number: 7024982
    Abstract: A combination of piston and piston ring includes a piston having a piston ring groove in which at least the groove portion of the piston is made of steel, a piston ring made of cast iron and fitted into the piston ring groove, and a hard coat film formed to at least an outer peripheral sliding surface of the piston ring.
    Type: Grant
    Filed: August 26, 2003
    Date of Patent: April 11, 2006
    Assignee: Nippon Piston Ring Co., Ltd.
    Inventors: Takeshi Aizawa, Manabu Kishida, Makoto Kajiwara
  • Publication number: 20040040436
    Abstract: A combination of piston and piston ring comprises a piston having a piston ring groove in which at least the groove portion of the piston is made of steel, a piston ring made of cast iron and fitted into the piston ring groove, and a hard coat film formed to at least an outer peripheral sliding surface of the piston ring.
    Type: Application
    Filed: August 26, 2003
    Publication date: March 4, 2004
    Applicant: NIPPON PISTON RING CO., LTD.
    Inventors: Takeshi Aizawa, Manabu Kishida, Makoto Kajiwara
  • Patent number: 6336842
    Abstract: An object of the present invention is to provide a polishing apparatus which is capable of configuring a surface of a polishing tool without damaging the polishing tool. In order to solve the above-mentioned problem, the present invention provide a rotary machining apparatus comprising a polishing tool for polishing a sample; a rotary disk for holding the polishing tool; a tool for configuring a surface of the polishing tool; and a position adjusting mechanism for adjusting a gap between the tool and the polishing tool, which comprises a rotating mechanism for rotating the tool; and a sensor for sensing a change in the rotation of the rotating mechanism, a height at starting to configure the polishing tool using the tool being determined based on the change in the rotation obtained by the sensor.
    Type: Grant
    Filed: May 19, 2000
    Date of Patent: January 8, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Shigeo Ootsuki, Shigeo Moriyama, Takashi Kugaya, Kenichi Togawa, Makoto Kajiwara, Shyuichi Oowada, Yukio Suzuki, Yoko Sugawa
  • Patent number: 6096258
    Abstract: A method and apparatus is disclosed for forming a cellulose film suitable for direct food contact by precipitation from a solution of cellulose water and a tertiary amine oxide cellulose solvent. After precipitation of a cellulose gel from the solution, the gel is washed at ever increasing temperatures and then dried to provide a cellulose film having a solvent level to not more than 40 ppm. Portions of the wash water is collected and treated to recover the solvent for reuse.
    Type: Grant
    Filed: January 20, 1998
    Date of Patent: August 1, 2000
    Assignee: Viskase Corporation
    Inventors: Paul Edmund DuCharme, Jr., Edward Makoto Kajiwara, Norman Abbye Portnoy
  • Patent number: 5766540
    Abstract: The tubular extrusion of a thermoplastic nonderivatized cellulose solution about a mandrel and through a long air gap in excess of 304 mm is facilitated by use of a mandrel which is extensible from the extrusion die. On extrusion start-up, the mandrel extends a short length from the die. For steady-state operation, the mandrel is extended its full length from the die. Also disclosed is a mandrel structure to facilitate the introduction of a nonsolvent liquid into the interior of the extruded tube at a high location on start-up of extrusion and at a lower location during steady-state operation.
    Type: Grant
    Filed: March 27, 1997
    Date of Patent: June 16, 1998
    Assignee: Viskase Corporation
    Inventors: Edward Makoto Kajiwara, Joseph Robert Walta, Ronald Joseph Jerantowski
  • Patent number: 5759478
    Abstract: The tubular extrusion of a thermoplastic nonderivatized cellulose solution about a mandrel and through a long air gap in excess of 304 mm is facilitated by use of a mandrel which is extensible from the extrusion die. On extrusion start-up, the mandrel extends a short length from the die. For steady-state operation, the mandrel is extended its full length from the die. Also disclosed is a mandrel structure to facilitate the introduction of a nonsolvent liquid into the interior of the extruded tube at a high location on start-up of extrusion and at a lower location during steady-state operation. The mandrel also includes a sizing portion having circumferential grooves which gather gas bubbles that may evolve at the interface between the extruded tube and the sizing portion. Vertical channels in the sizing portion connect these grooves and provide the passage of gas bubbles into a volume below the mandrel.
    Type: Grant
    Filed: March 27, 1997
    Date of Patent: June 2, 1998
    Assignee: Viskase Corporation
    Inventors: Edward Makoto Kajiwara, Brant Anton Loichinger
  • Patent number: 5702783
    Abstract: A cellulose food casing comprising a nonderivatized cellulose film precipitated in tubular form from an extruded thermoplastic solution of cellulose, an amine oxide cellulose solvent and water.
    Type: Grant
    Filed: August 16, 1995
    Date of Patent: December 30, 1997
    Assignee: Viskase Corporation
    Inventors: Myron Donald Nicholson, Edward Makoto Kajiwara, Paul Edmund DuCharme, Jr.