Patents by Inventor Tatsuya GOZAWA

Tatsuya GOZAWA 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).

  • Patent number: 10666023
    Abstract: A spark plug includes: a center electrode; an insulating member; a metal shell; a ground electrode; and a cap covers an opening of the metal shell on the front end side to define an auxiliary combustion space in which the gap is disposed, a first angle being formed by a second line and a first tangent line, a second angle being formed by the second line and a second tangent line, the second angle being greater than the first angle, and at least a portion of the opening of the specific through hole on the auxiliary combustion space side being positioned on a range of the second angle.
    Type: Grant
    Filed: June 28, 2019
    Date of Patent: May 26, 2020
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventor: Tatsuya Gozawa
  • Publication number: 20200106246
    Abstract: A spark plug includes: an insulator with an axial hole; a center electrode held in a front end side of the axial hole; a cylindrical metal shell disposed around the insulator and having a seal part brought into contact with an outer circumferential surface of the insulator; a ground electrode arranged to form a gap with the center electrode; and a cap connected to a front end part of the metal shell to define therein an auxiliary combustion space in which the gap is formed, the cap having at least one through hole formed to provide communication between the auxiliary combustion space and the outside, wherein the condition (B/A)?0.25 is satisfied where A represents a volume of an imaginary space defined at a position frontward of the seal part; and B represents a volume of parts of the ground and center electrodes located in the imaginary space.
    Type: Application
    Filed: August 23, 2019
    Publication date: April 2, 2020
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventor: Tatsuya GOZAWA
  • Publication number: 20200014175
    Abstract: A spark plug includes: a center electrode; an insulating member; a metal shell; a ground electrode; and a cap covers an opening of the metal shell on the front end side to define an auxiliary combustion space in which the gap is disposed, a first angle being formed by a second line and a first tangent line, a second angle being formed by the second line and a second tangent line, the second angle being greater than the first angle, and at least a portion of the opening of the specific through hole on the auxiliary combustion space side being positioned on a range of the second angle.
    Type: Application
    Filed: June 28, 2019
    Publication date: January 9, 2020
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventor: Tatsuya GOZAWA
  • Patent number: 10312669
    Abstract: An electrode base material of the spark plug contains not less than 50 wt. % of Ni. A discharge member contains not less than 45 wt. % of Pt, and at least one of Ni and Rh. An intermediate member contains Pt and Ni. In the discharge member, a content of Pt is highest, and a total content of Pt, Rh, and Ni is not less than 92 wt. %. In the intermediate member, a content of one of Pt and Ni is not less than 50 wt. %, a content of Ni is higher than a content of Ni in the discharge member, and a total content of Pt, Rh, and Ni is not less than 85 wt. %. A thickness of the diffusion layer formed between the discharge member and the intermediate member is not less than 0.002 mm and not more than 0.065 mm.
    Type: Grant
    Filed: October 17, 2016
    Date of Patent: June 4, 2019
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Daisuke Sumoyama, Tatsuya Gozawa, Tsutomu Shibata
  • Patent number: 10186845
    Abstract: An electrode tip for a spark plug, wherein Pt is contained as a main component, 7% by mass or more of Rh is contained, and a total content of Pt and Rh is greater than or equal to 95% by mass. The electrode tip includes: a narrow portion having the same cross-sectional shape in a direction of an axis; and a wide portion which is adjacent to the narrow portion and has a cross-sectional area, in a radial direction, which is greater than the narrow portion.
    Type: Grant
    Filed: May 26, 2015
    Date of Patent: January 22, 2019
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Daisuke Sumoyama, Tatsuya Gozawa, Magoki Shimadate, Yusuke Kawashima
  • Publication number: 20180366918
    Abstract: An electrode base material of the spark plug contains not less than 50 wt. % of Ni. A discharge member contains not less than 45 wt. % of Pt, and at least one of Ni and Rh. An intermediate member contains Pt and Ni. In the discharge member, a content of Pt is highest, and a total content of Pt, Rh, and Ni is not less than 92 wt. %. In the intermediate member, a content of one of Pt and Ni is not less than 50 wt. %, a content of Ni is higher than a content of Ni in the discharge member, and a total content of Pt, Rh, and Ni is not less than 85 wt. %. A thickness of the diffusion layer formed between the discharge member and the intermediate member is not less than 0.002 mm and not more than 0.065 mm.
    Type: Application
    Filed: October 17, 2016
    Publication date: December 20, 2018
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Daisuke SUMOYAMA, Tatsuya GOZAWA, Tsutomu SHIBATA
  • Patent number: 10033163
    Abstract: A spark plug having a tip formed of an alloy containing Pt. The tip contains not less than 6 mass % of Rh, at least one element selected from an R group consisting of Rh, Re, Ir, Ru, W, Mo, and Nb, not less than 5 mass % of Ni, and at least one element selected from an N group consisting of Ni, Co, Fe, and Cu. The tip contains Rh most among the elements of the R group, and contains Ni most among the elements of the N group. The total of contents of Pt, Rh, and Ni is not less than 91 mass %, and the total of contents of Pt, the R group, and the N group is not less than 95 mass %. A value obtained by dividing the content of the R group by the content of the N group is not less than 0.7 and not greater than 8.
    Type: Grant
    Filed: January 9, 2018
    Date of Patent: July 24, 2018
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Daisuke Sumoyama, Tatsuya Gozawa, Tsutomu Shibata
  • Patent number: 9705292
    Abstract: A spark plug comprising a center electrode, a ground electrode disposed on the center electrode across a gap, and a tip joined to an opposed surface of the ground electrode that is opposed to the center electrode, the tip has a discharge layer and a relieving layer, the relieving layer is formed from a Pt—Ni alloy and joined to the opposed surface via a diffusion layer, the discharge layer is formed from a Pt—Rh alloy and joined via a clad diffusion layer to a side of the relieving layer opposite to a side of the relieving layer at which the ground electrode is joined, and 0.81?A/B?1.21 is satisfied when an average cross-sectional area of the discharge layer is A mm2 and an average cross-sectional area of the relieving layer is B mm2, and a method for producing the spark plug.
    Type: Grant
    Filed: August 24, 2016
    Date of Patent: July 11, 2017
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Tatsuya Gozawa, Daisuke Sumoyama, Tsutomu Shibata
  • Publication number: 20170187170
    Abstract: An electrode tip for a spark plug, wherein Pt is contained as a main component, 7% by mass or more of Rh is contained, and a total content of Pt and Rh is greater than or equal to 95% by mass. The electrode tip includes: a narrow portion having the same cross-sectional shape in a direction of an axis; and a wide portion which is adjacent to the narrow portion and has a cross-sectional area, in a radial direction, which is greater than the narrow portion.
    Type: Application
    Filed: May 26, 2015
    Publication date: June 29, 2017
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Daisuke SUMOYAMA, Tatsuya GOZAWA, Magoki SHIMADATE, Yusuke KAWASHIMA
  • Publication number: 20170063048
    Abstract: A spark plug comprising a center electrode, a ground electrode disposed on the center electrode across a gap, and a tip joined to an opposed surface of the ground electrode that is opposed to the center electrode, the tip has a discharge layer and a relieving layer, the relieving layer is formed from a Pt—Ni alloy and joined to the opposed surface via a diffusion layer, the discharge layer is formed from a Pt—Rh alloy and joined via a clad diffusion layer to a side of the relieving layer opposite to a side of the relieving layer at which the ground electrode is joined, and 0.81?A/B?1.21 is satisfied when an average cross-sectional area of the discharge layer is A mm2 and an average cross-sectional area of the relieving layer is B mm2, and a method for producing the spark plug.
    Type: Application
    Filed: August 24, 2016
    Publication date: March 2, 2017
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Tatsuya GOZAWA, Daisuke SUMOYAMA, Tsutomu SHIBATA