公开(公告)号：US20220282358A1

公开(公告)日：2022-09-08

申请号：US17412661

申请日：2021-08-26

Applicant: ISHIFUKU METAL INDUSTRY CO., LTD. ,  DENSO CORPORATION

Inventor： Shunsuke YOKOTA ,  Yoshinori DOI ,  Ryohei AKIYOSHI ,  Ken HANASHI

IPC: C22C28/00

Abstract: Provided is an Ir alloy which is excellent in high temperature strength while ensuring oxidation wear resistance at high temperature. The Ir alloy consists of: 7 mass % or more, and less than 10 mass % of Rh; 0.5 mass % to 5 mass % of Ta; 0 mass % to 5 mass % of at least one kind of element selected from among Co, Cr, and Ni; and Ir as the balance, wherein a total content of the Ta and the at least one kind of element selected from among Co, Cr, and Ni is 5 mass % or less.

公开(公告)号：US20190386467A1

公开(公告)日：2019-12-19

申请号：US16551912

申请日：2019-08-27

Applicant: DENSO CORPORATION

Inventor： Noriaki NISHIO ,  Masamichi SHIBATA ,  Kanechiyo TERADA ,  Ken HANASHI ,  Ryohei AKIYOSHI ,  Fumiaki AOKI

IPC: H01T13/32

Abstract: A center electrode is held in insulating glass, in which a tip end portion of the center electrode protrudes. A ground electrode has a connection part connected to a housing. The ground electrode forms a spark discharge gap between the center electrode and the ground electrode. The ground electrode has a ground base material that includes the connection part and a ground protrusion part that protrudes from the ground base material toward the center electrode and forms the spark discharge gap between the center electrode and the ground electrode. An angle between a ground discharge surface of the ground protrusion part and a side surface of the ground protrusion part is a right angle or an acute angle. At least a portion of the side surface of the ground protrusion part and at least a portion of a side surface of the ground base material are flush with each other.

公开(公告)号：US20190338395A1

公开(公告)日：2019-11-07

申请号：US16471054

申请日：2017-12-20

Applicant: ISHIFUKU METAL INDUSTRY CO., LTD. ,  DENSO CORPORATION

Inventor： Shunsuke YOKOTA ,  Yoshinori DOI ,  Ryohei AKIYOSHI ,  Ken HANASHI

IPC: C22C5/04

Abstract: An Ir alloy is excellent in high temperature strength while ensuring oxidation wear resistance at high temperature. The heat-resistant Ir alloy includes: 5 mass % to 30 mass % of Rh; 0.3 mass % to 5 mass % of an element group A made of at least one kind of element selected from among Ta and Re; and 0 mass % to 5 mass % of an element group B made of at least one kind of element selected from among Co, Cr, and Ni, wherein the heat-resistant Ir alloy includes 5 mass % or less of the element group A and the element group B in total, and wherein, when the at least one kind of element in the element group A includes Re, the at least one kind of element in the element group B is Co alone, Cr alone, or two or more kinds selected from Co, Cr, and Ni.

公开(公告)号：US20230056816A1

公开(公告)日：2023-02-23

申请号：US17890546

申请日：2022-08-18

Applicant: DENSO CORPORATION

Inventor： Ryohei AKIYOSHI

IPC: H01T13/39

Abstract: A spark plug includes a first discharge chip and a second discharge chip which faces the first discharge chip and works to produce an electrical spark therebetween. At least one of the first and second discharge chips is made from material containing iridium, platinum, and tantalum. An amount of platinum in the material is in a range of 5 Wt % to 30 Wt %. An amount of tantalum is in a range of 0.3 Wt % to 7.5 Wt %. Use of such material enhances a wear resistance of the spark plug.

公开(公告)号：US20200112145A1

公开(公告)日：2020-04-09

申请号：US16595885

申请日：2019-10-08

Applicant: DENSO CORPORATION

Inventor： Ryohei AKIYOSHI

IPC: H01T13/32 ,  H01T13/02 ,  H01T21/02 ,  H01T13/39

Abstract: A spark plug includes a ground electrode that is curved to oppose a tip end surface of a center electrode. A predetermined virtual plane that passes through a center axis of the spark plug along the curved ground electrode faces a flow direction of airflow. The ground electrode includes a main body including: an opposing surface on a first side facing the tip end surface of the center electrode; and a sloped surface on a second side opposite the first side. The main body satisfies 10 [°]≤Dg≤70 [°], 1.0 [mm]≤Th, and 1.5 [mm]≤Wd, where Dg is a slope angle of the sloped surface relative to the opposing surface, Th is a thickness of the main body in an insertion direction of the center electrode, and Wd is a width of the ground electrode in a direction perpendicular to the virtual plane.

公开(公告)号：US20170279248A1

公开(公告)日：2017-09-28

申请号：US15464716

申请日：2017-03-21

Applicant: DENSO CORPORATION

Inventor： Ryohei AKIYOSHI ,  Hidekazu FUJIMOTO

IPC: H01T13/32

CPC classification number: H01T13/32

Abstract: A spark plug for an internal combustion engine provided with a cylindrical housing, a ceramic insulator, a center electrode and a ground electrode. The ground electrode has a body base disposed from a front end surface of the cylindrical housing to a front end-side thereof. The ground electrode has a spark discharge gap formed therebetween itself and the center electrode. The body base is provided with pair of side-connecting surfaces which connect the inner surface and the outer surface. Each of the side-connecting surfaces having a side flat surface which is a flat surface parallel to an aligning direction of the center electrode and the body base. A distance between the pair of the side flat surfaces is a maximum width of the body base. A minimum distance between the inner surface and the side flat surface satisfies a relationship of 0.1 mm≦L≦0.5 mm, in the aligning direction.

公开(公告)号：US20220170136A1

公开(公告)日：2022-06-02

申请号：US17538320

申请日：2021-11-30

Applicant: ISHIFUKU METAL INDUSTRY CO., LTD. ,  DENSO CORPORATION

Inventor： Shunsuke YOKOTA ,  Kenta TERAI ,  Hayato YASUHARA ,  Ryohei AKIYOSHI ,  Ken HANASHI ,  Ikuya ANDO

IPC: C22C5/04 ,  B22F5/12

Abstract: Provided is an Ir alloy wire, which is further improved in oxidation wear resistance while ensuring a Vickers hardness. The Ir alloy wire includes: 5 mass % to 30 mass % of Rh; and 0.5 mass % to 5 mass % of Ta, wherein an average value A for an aspect ratio (crystal grain length/crystal grain width) of a structure of the alloy wire in a range of a depth of 0.05 mm or less from a surface of the alloy wire satisfies 1≤A

公开(公告)号：US20190214792A1

公开(公告)日：2019-07-11

申请号：US16088976

申请日：2017-03-24

Applicant: DENSO CORPORATION

Inventor： Ryuichi OHNO ,  Ryohei AKIYOSHI

IPC: H01T13/32

CPC classification number: H01T13/32

Abstract: A spark plug for an internal combustion engine includes a cylindrical housing, a cylindrical insulator, a center electrode, and a ground electrode. The ground electrode includes an upright part and an inclined part. The upright part is a portion vertically provided on a tip end part of the housing to a tip end side. The inclined part is a portion that is bent from the tip of the upright part toward the center electrode side, and is extended toward an oblique tip end side. The inclined part has a ground end face, an opposed face, and a corner curved face. The corner curved face is a face that smoothly connects the ground end face and the opposed face. The corner curved face has a curved shape. The curvature radius R of the corner curved face satisfies 0.3 mm≤R≤0.7 mm. The inclination angle θ of the inclined part with respect to a plug axial direction (Z) satisfies 30°≤θ≤60°.

公开(公告)号：US20190199068A1

公开(公告)日：2019-06-27

申请号：US16089479

申请日：2017-03-17

Applicant: DENSO CORPORATION

Inventor： Masamichi SHIBATA ,  Ryohei AKIYOSHI

IPC: H01T13/32 ,  H01T21/02

CPC classification number: H01T13/32 ,  H01T13/39 ,  H01T21/02

Abstract: There is provided a spark plug for an internal combustion engine with a simple configuration capable of ensuring stable ignitability regardless of mounting posture to the internal combustion engine. The spark plug includes a housing, an insulator, a center electrode, and a ground electrode. The ground electrode includes an erecting part that is erected from a tip part of the housing to a tip side and an inclined part that is bent from the tip of the erecting part to the center electrode side to extend obliquely toward a tip side. An end edge of the ground electrode on an opposite side to the housing side is a tip of the inclined part. The erecting part satisfies w/t≤1, w≤1.9 mm, and t≤2.3 mm, where t is a dimension in an alignment direction of the erecting part and the center electrode, and w is a dimension in a width direction orthogonal to each of the alignment direction and a plug axial direction. An inclination angle θ of the inclined part with respect to the plug axial direction satisfies 30°≤θ≤60°.

公开(公告)号：US20230383381A1

公开(公告)日：2023-11-30

申请号：US18143654

申请日：2023-05-05

Applicant: ISHIFUKU METAL INDUSTRY CO., LTD. ,  DENSO CORPORATION

Inventor： Kenta TERAI ,  Shunsuke TAKEYA ,  Hayato YASUHARA ,  Akihiro SHIBATA ,  Ryohei AKIYOSHI ,  Yuji KAJI

IPC: C22C5/04

CPC classification number: C22C5/04

Abstract: Provided is a heat-resistant Ir alloy, which is further improved in Vickers hardness while maintaining satisfactory processability. Specifically, provided is a heat-resistant Ir alloy, including: 5 mass % to 30 mass % of Pt; 0.5 mass % to 5 mass % of Ta; and 0.003 mass % to 0.15 mass % of at least one kind selected from the group consisting of: Sc; Hf; and W, with the balance being Ir.