Patents Assigned to Nippon Piston Ring Co., Ltd.
  • Patent number: 11293548
    Abstract: A sliding member (10) including a coating film (1) composed of a hard carbon layer on a sliding surface (16) of a base material (11). The coating film has, when a cross section thereof is observed by a bright-field TEM image, a thickness within a range of 1 ?m to 50 ?m, and is configured by repeating units including black hard carbon layers (B), relatively shown in black, and white hard carbon layers (W), relatively shown in white, and laminated in a thickness direction, and comprise an inclined region, provided on a base material side, where thicknesses of white hard carbon layers (W) of the repeating units gradually increase in a thickness direction, and a homogeneous region\, provided on a surface side of the sliding member, where thicknesses of the white hard carbon layers (W) of the repeating units are the same or substantially the same in the thickness direction.
    Type: Grant
    Filed: June 15, 2018
    Date of Patent: April 5, 2022
    Assignees: NIPPON PISTON RING CO., LTD, NIPPON ITF, INC
    Inventors: Takahiro Okazaki, Yoshihiro Ito, Hiroyuki Sugiura, Shinya Kanazawa, Hideki Moriguchi, Akinori Shibata, Takehiko Ooshiro
  • 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
  • Patent number: 11261519
    Abstract: The purpose of the invention is to provide technology, which, in addition to being capable of forming thick hard carbon films of excellent durability even using PVD, is able to establish both chipping resistance and wear resistance in the formed hard carbon film and able to improve low friction properties and peeling resistance. Provided is a coating film to be coated on the surface of a substrate, the coating film having a total film thickness of greater than 1 ?m to 50 ?m wherein: when a cross-section is observed using bright field TEM images, white hard carbon layers that are shown as relatively white and black hard carbon layers that are shown as black are alternately laminated in the thickness direction; and the white hard carbon layers have regions that have grown in a fan-shape in the thickness direction.
    Type: Grant
    Filed: December 16, 2016
    Date of Patent: March 1, 2022
    Assignees: NIPPON ITF, INC., NIPPON PISTON RING CO., LTD.
    Inventors: Hideki Moriguchi, Akinori Shibata, Takehiko Ooshiro, Yoshihiro Ito, Takahiro Okazaki, Hiroyuki Sugiura
  • 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
  • Publication number: 20210215071
    Abstract: Provided is a valve seat insert for an internal combustion engine, which has both an excellent heat dissipation property and excellent wear resistance. The valve seat insert for an internal combustion engine is used while being press-fitted into an aluminum alloy cylinder head, is made of an iron-based sintered alloy, is formed by integrating two layers of a functional member side layer and a supporting member side layer, and has a plating film on at least an outer peripheral side. The plating film is preferably a copper plating film. The plating film is a plating film having a thickness of 1 to 100 ?m and a hardness of 50 to 300 HV, and the hardness of the plating film is adjusted so as to satisfy a range of 1.05 to 4.5 times hardness of the cylinder head in Vickers hardness HV. Pores contained in the valve seat insert are preferably sealed with a curable resin before plating treatment.
    Type: Application
    Filed: May 14, 2019
    Publication date: July 15, 2021
    Applicant: Nippon Piston Ring Co., Ltd.
    Inventors: Ayato OIKAWA, Kiyoshi SUWA, Katsuaki OGAWA, Hiroshi OSHIGE, Kenichi SATO
  • Patent number: 11047479
    Abstract: A method for producing a piston ring for a cylinder that moves in a sliding direction includes providing a piston ring base material having an upper surface, a lower surface and an outer circumferential surface having a first recess between the upper surface and the lower surface, forming a hard film in the first recess and on a cylindrical surface at a predetermined thickness, and removing, by performing a polishing process on the sliding surface, the hard film formed on the cylindrical surface and a part of the piston ring base material disposed adjacent to the removed hard film, to form a second recess. The second recess is formed by removing an area of the removed part of the piston ring base material as a result of polishing the sliding surface due to a difference in the hardness of the hard film and the piston ring base material.
    Type: Grant
    Filed: November 15, 2019
    Date of Patent: June 29, 2021
    Assignee: NIPPON PISTON RING CO., LTD.
    Inventors: Kazuhiro Fujimura, Atsushi Chiba, Naoyuki Akimoto, Iwao Hiraishi
  • Publication number: 20200299812
    Abstract: To provide a sliding member, such as a piston ring for an internal combustion engine, having low friction and excellent toughness. The above-described problem is solved by a sliding member (10) such as a piston ring coated with a Cr—B—Ti—V—(Mn, Mo)-N-based alloy film (2) on a sliding surface (11) thereof, and configured so that the alloy film (2) contains one or both of Mn and Mo and has a total content of the Mn and the Mo within a range of 2 mass % or less. Preferably, a B content is within a range of 0.1 mass % to 1.5 mass %, inclusive, a V content is within a range of 0.05 mass % to 1 mass %, inclusive, and a Ti content is within a range of 0.05 mass % to 1.5 mass %, inclusive.
    Type: Application
    Filed: November 28, 2018
    Publication date: September 24, 2020
    Applicant: NIPPON PISTON RING CO., LTD.
    Inventors: Noriaki CHIDA, Shota SEKI
  • Patent number: 10724636
    Abstract: Provided is a combined oil ring that further reduces engine oil consumption. A combined oil ring attached to an oil ring groove of a piston includes: a pair of upper and lower side rails each formed into a flat annular shape, and having a slide contact part that comes into sliding contact with a cylinder; and a spacer expander arranged between the pair of upper and lower side rails. In at least the upper side rail of the pair of upper and lower side rails, a cross-sectional shape of the slide contact part along an axial direction of the piston is a tapered shape linearly spreading from upper to lower parts of the piston; the tapered shape is at an angle of 5 to 30 degrees with respect to a central axis of the spacer expander, and has a vertex of the tapered shape within 0.15 mm from a lower end of the side rail; and a part closer to the lower end than the vertex is formed into a curved shape having a curvature of R0.01 to 0.5.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: July 28, 2020
    Assignee: NIPPON PISTON RING CO., LTD.
    Inventors: Masataka Kawasaki, Mamoru Miyamoto, Hideshi Hitosugi, Kenji Arai
  • Publication number: 20200217416
    Abstract: A sliding member (10) including a coating film (1) composed of a hard carbon layer on a sliding surface (16) of a base material (11). The coating film has, when a cross section thereof is observed by a bright-field TEM image, a thickness within a range of 1 ?m to 50 ?m, and is configured by repeating units including black hard carbon layers (B), relatively shown in black, and white hard carbon layers (W), relatively shown in white, and laminated in a thickness direction, and comprise an inclined region, provided on a base material side, where thicknesses of white hard carbon layers (W) of the repeating units gradually increase in a thickness direction, and a homogeneous region\, provided on a surface side of the sliding member, where thicknesses of the white hard carbon layers (W) of the repeating units are the same or substantially the same in the thickness direction.
    Type: Application
    Filed: June 15, 2018
    Publication date: July 9, 2020
    Applicants: NIPPON PISTON RING CO., LTD., NIPPON ITF, INC.
    Inventors: Takahiro OKAZAKI, Yoshihiro ITO, Hiroyuki SUGIURA, Shinya KANAZAWA, Hideki MORIGUCHI, Akinori SHIBATA, Takehiko OOSHIRO
  • Patent number: 10669613
    Abstract: A titanium alloy includes 15 to 27 atomic % (at %) of tantalum (Ta) and 0 to 8 at % of tin (Sn), the balance being titanium (Ti) and unavoidable impurities, when the entire 5 amount of the titanium alloy is taken as 100 at %. Therefore, the titanium alloy provided has characteristics suitable for medical device materials, biocompatible materials, etc.
    Type: Grant
    Filed: August 3, 2017
    Date of Patent: June 2, 2020
    Assignees: NIPPON PISTON RING CO., LTD., NATIONAL UNIVERSITY CORPORATION SAITAMA UNIVERSITY
    Inventors: Shunsuke Takeguchi, Yoshiki Ishikawa, Takasumi Kubo, Shin Ishida, Hiroki Takahashi, Masafumi Morita, Masahito Miki
  • Patent number: 10619739
    Abstract: To provide a piston ring comprising a hard carbon film that is easy to form and exhibits excellent wear resistance. The above-described problem is solved by having a hard carbon film 4 formed on at least an outer peripheral sliding surface 11 of a piston ring base material 1, wherein the hard carbon film 4 is a laminated film comprising a plurality of layers, and is configured so as to contain boron within a range of an atomic density of 0.2×1022 atoms/cm3 to 2.0×1022 atoms/cm3 inclusive. This hard carbon film 4 may be configured to have an sp2 component ratio within a range of 40% to 80% inclusive, measured in a TEM-EELS spectrum formed by combining electron energy loss spectroscopy (EELS) with a transmission electron microscope (TEM), and a hydrogen content within a range of 0.1 atom % to 5 atom % inclusive. Further, a total thickness of this hard carbon film 4 may be configured to be within a range of 0.5 ?m to 20 ?m inclusive.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: April 14, 2020
    Assignee: NIPPON PISTON RING CO., LTD
    Inventors: Takuya Ozaki, Hiroyuki Sugiura
  • Patent number: 10605374
    Abstract: A valve seat insert made of an iron-base sintered alloy is configured to have a structure in which the base matrix phase is a fine carbide precipitation phase in which a fine carbide being 10 ?m or less in size is precipitated and which has a hardness of 550 HV or more in Vickers hardness; and in the base matrix phase, hard-particles having a hardness of 650-1200 HV in Vickers hardness are dispersed in an area percentage of 20-40%, a diffusional phase is formed in an area percentage of more than 0% and not more than 5%, and solid-lubricant particles are dispersed in an area percentage of 0-5%. Even if a valve having a high face hardness of 400 HV or more, or 600 HV or more is used, a facing valve seat insert wears only slightly, improving valve train durability.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: March 31, 2020
    Assignee: NIPPON PISTON RING CO., LTD.
    Inventors: Seisuke Takaki, Hiroshi Oshige, Ayato Oikawa
  • Patent number: 10583217
    Abstract: There is provided an implant that is safe for the living body. An angular plate as the implant includes a bone supporting plate part and a blade part. The blade part is integrally formed with the bone supporting plate part, and extends from one end of the bone supporting plate part at a predetermined angle ? (0°<?<180°) relative to the bone supporting plate part. The angular plate is formed from a titanium-tantalum-based alloy containing tin. The angular plate is preferably formed from a titanium-tantalum-based alloy containing tin in which a Young's modulus is decreased by increasing the reduction ratio thereof.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: March 10, 2020
    Assignee: NIPPON PISTON RING CO., LTD.
    Inventors: Yoshiki Ishikawa, Yuki Kimura, Takasumi Kubo, Hiroshi Matsushima, Takashi Kawabata, Toshio Nagase
  • Patent number: 10578214
    Abstract: To provide a piston ring comprising a hard carbon film that is easy to form and exhibits excellent adhesion and wear resistance, and a manufacturing method therefor. The above-described problem is solved by means of a piston ring comprising a hard carbon film 50 formed on at least an outer peripheral sliding surface 11 of a piston ring base material 1, wherein the hard carbon film 50 is a laminated film comprising a plurality of layers, including an upper layer 5 with a lamination pitch within a range of 3 nm to 50 nm inclusive, a middle layer 4 with a lamination pitch less than that of the upper layer 5, and a lower layer 3 with a lamination pitch within the same range as that of the upper layer 5 and greater than that of the middle layer 4.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: March 3, 2020
    Assignee: NIPPON PISTON RING CO., LTD
    Inventors: Takuya Ozaki, Hiroyuki Sugiura
  • Patent number: 10520085
    Abstract: A combined oil ring in which carbon sludge and the like are not deposited between side rails and a spacer expander even if an internal combustion engine is operated for a long period of time. The combined oil ring includes an outer circumferential end portion of a space forming part and a continuous part that are closed and not open toward the outer circumferential side, thereby reducing carbon sludge deposits.
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: December 31, 2019
    Assignee: NIPPON PISTON RING CO., LTD.
    Inventors: Yasuyuki Murata, Kenji Arai, Ryosuke Kamata, Hideshi Hitosugi, Kazumoto Takahashi, Toru Tsukui
  • Patent number: 10514097
    Abstract: A method for producing a piston ring for a cylinder that moves in a sliding direction includes providing a piston ring base material having an upper surface, a lower surface and an outer circumferential surface having a first recess between the upper surface and the lower surface, forming a hard film in the first recess and on a cylindrical surface at a predetermined thickness, and removing, by performing a polishing process on the sliding surface, the hard film formed on the cylindrical surface and a part of the piston ring base material disposed adjacent to the removed hard film, to form a second recess. The second recess is formed by removing an area of the removed part of the piston ring base material as a result of polishing the sliding surface due to a difference in the hardness of the hard film and the piston ring base material.
    Type: Grant
    Filed: August 9, 2017
    Date of Patent: December 24, 2019
    Assignee: NIPPON PISTON RING CO., LTD.
    Inventors: Kazuhiro Fujimura, Atsushi Chiba, Naoyuki Akimoto, Iwao Hiraishi
  • Publication number: 20190358021
    Abstract: A medical member of the present invention includes a knitted body knitted with a linear member formed in a linear shape, at least a part of the knitted body is constituted of an alloy containing titanium, tantalum, and tin, and the alloy is constituted of 15 at % to 27 at % of tantalum and 1 at % to 8 at % of tin, where the total is 100 at %, with remainder being titanium and unavoidable impurities. The knitted body is formed in a sheet shape by plain weaving, twilled weaving, plain dutch weaving, twilled dutch weaving, or stockinette stitch. Thus, there can be provided a medical member capable of dispersing a load applied to a treating site of a soft tissue.
    Type: Application
    Filed: January 18, 2018
    Publication date: November 28, 2019
    Applicants: NIPPON PISTON RING CO., LTD., NIPPON PISTON RING CO., LTD.
    Inventors: Takasumi KUBO, Yoshiki ISHIKAWA, Hiroshi MATSUSHIMA, Yuki KIMURA, Masahiro SHINZAWA, Takashi KAWABATA, Toshio NAGASE
  • Patent number: 10457885
    Abstract: Provided are a coating film, a manufacturing method for the same, and a PVD device that not only sufficiently improve the balance of low-friction properties and wear resistance, but also improve chipping resistance and peeling resistance. This film is coated on a substrate surface, wherein the coating film has a hard carbon that presents relatively black and white when observed in a cross-sectional bright-field TEM image, a mesh-shaped hard carbon layer is formed using a PVD method, said layer having white-colored hard carbon in a mesh shape extending in the thickness direction and black-colored hard carbon dispersed into the cavities in the mesh, and the ID/IG ratio is 1-6 when the mesh-shaped hard carbon layer is measured using Raman spectroscopy, said ratio being the ratio of the Raman spectrum D band peak area intensity and G band peak area intensity.
    Type: Grant
    Filed: September 17, 2014
    Date of Patent: October 29, 2019
    Assignees: NIPPON ITF, INC., NIPPON PISTON RING CO., LTD.
    Inventors: Hideki Moriguchi, Tadashi Saito, Yoshikazu Tanaka, Akinori Shibata, Tetsumi Arahi, Katsuaki Ogawa, Takahiro Okazaki, Hiroyuki Sugiura, Yoshihiro Ito
  • Patent number: 10428700
    Abstract: A highly wear-resistant valve seat insert for an internal combustion engine, having a material composition in which hard-particles are uniformly and finely dispersed in the matrix phase, and which is excellent in wear-resistance and radial crushing strength, based on a blended fine powder and a matrix forming powder with a particle size approximately equal to that of the hard-particles so as to prevent the hard-particles from aggregating and thus coarsely dispersing as a hard-particle phase.
    Type: Grant
    Filed: January 31, 2014
    Date of Patent: October 1, 2019
    Assignee: NIPPON PISTON RING CO., LTD.
    Inventors: Satoshi Ikemi, Hiroshi Oshige, Kenichi Sato
  • Patent number: 10428416
    Abstract: Provided are a coating film, a manufacturing method for the same, and a PVD device that not only sufficiently improve the balance of low-friction properties and wear resistance, but also improve chipping resistance (defect resistance) and peeling resistance. This coating film coats a substrate surface, wherein a hard carbon layer is formed extending in columns-shape perpendicular to the substrate when observed in a cross-sectional bright-field TEM image, the hard carbon layer is formed using a PVD method, and the ID/IG ratio is 1-6 when the hard carbon layer is measured using Raman spectroscopy, said ratio being the ratio of the Raman spectrum D band peak area intensity and G band peak area intensity.
    Type: Grant
    Filed: September 17, 2014
    Date of Patent: October 1, 2019
    Assignees: NIPPON ITF, INC., NIPPON PISTON RING CO., LTD.
    Inventors: Hideki Moriguchi, Tadashi Saito, Yoshikazu Tanaka, Tetsumi Arahi, Katsuaki Ogawa, Takahiro Okazaki, Hiroyuki Sugiura, Yoshihiro Ito