公开(公告)号：US11515690B2

公开(公告)日：2022-11-29

申请号：US17292898

申请日：2020-04-27

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Kenji Ban ,  Tatsuya Gozawa

IPC: H01T13/54 ,  H01T13/32

Abstract: A spark plug capable of generating a sufficient volume of jet with an increased range is provided. The spark plug includes a metal shell having a tubular shape; a center electrode retained in the metal shell in an insulated manner; a ground electrode that is electrically connected to the metal shell and that defines a spark gap between the center electrode and an end portion of the ground electrode; and a cap portion that covers the center electrode and the end portion of the ground electrode from the front in a region in front of the metal shell and in which a through hole is formed. The cap portion includes a plurality of projections on an inner surface of the through hole. The projections extend in an extending direction in which the through hole extends.

公开(公告)号：US10811851B1

公开(公告)日：2020-10-20

申请号：US16877897

申请日：2020-05-19

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tatsuya Gozawa ,  Kenji Ban

IPC: H01T13/06 ,  H01T13/20

Abstract: A spark plug includes: a center electrode; a ground electrode that is provided such that a gap for spark discharge is formed between the center electrode and the ground electrode; and a plug cover covering the center electrode and the ground electrode from a front side. The plug cover has a through hole, wherein the plug cover includes a diameter reduction portion formed in a range of 0.1 mm or less from an outer open end of the through hole in a direction along a central axis of the through hole and having a diameter gradually decreasing from the outer open end toward an inner open end of the through hole. A relationship of 0 mm

公开(公告)号：US10777976B1

公开(公告)日：2020-09-15

申请号：US16848289

申请日：2020-04-14

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tatsuya Gozawa ,  Kenji Ban ,  Daiki Goto

IPC: H01T13/39 ,  H01T13/32 ,  H01T21/02 ,  H01T13/52 ,  H01T13/06

Abstract: A spark plug wherein the occurrence of pre-ignition and misfires is suppressed. The spark plug includes a cover portion that covers a front end portion of a center electrode and a facing portion of a ground electrode from a front end side of the spark plug to form a pre-chamber space. The cover portion has injection holes that are through-holes. A total area A (mm2) of inner peripheral surfaces of the injection holes and a thermal conductivity B (W/mK) of a material of the cover portion satisfy a formula (1): 10

公开(公告)号：US10714908B1

公开(公告)日：2020-07-14

申请号：US16843977

申请日：2020-04-09

Applicant: NGK Spark Plug Co., Ltd.

Inventor： Tatsuya Gozawa ,  Kenji Ban

IPC: H01T13/06 ,  H01T21/02 ,  H01T13/32 ,  H01T13/39 ,  H01T13/08

Abstract: A spark plug includes a center electrode; a metal shell that retains the center electrode at an outer periphery of the center electrode in an insulating manner; a ground electrode disposed such that a spark gap is formed between the center electrode and an end portion of the ground electrode; and a plug cap connected to the metal shell, the plug cap covering the center electrode and the end portion of the ground electrode from front and having a through hole in a region in front of the ground electrode. An inner surface of the plug cap has at least one ridge in a first region that is in front of an inner open end of the through hole.

公开(公告)号：US10033163B1

公开(公告)日：2018-07-24

申请号：US15865788

申请日：2018-01-09

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Daisuke Sumoyama ,  Tatsuya Gozawa ,  Tsutomu Shibata

IPC: H01T13/20 ,  H01T13/39 ,  C22C5/04 ,  H01T21/02 ,  H01T13/32

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.

公开(公告)号：US12027827B2

公开(公告)日：2024-07-02

申请号：US17915303

申请日：2020-11-16

Applicant: NGK SPARK PLUG CO., LTD

Inventor： Tatsuya Gozawa

IPC: H01T13/32 ,  H01T13/54 ,  H01T21/02

CPC classification number: H01T13/32 ,  H01T13/54 ,  H01T21/02

Abstract: A spark plug includes a metallic shell which holds a center electrode in an insulated condition, and a ground electrode is held in a penetration hole of the metallic shell. The penetration hole includes a circular counterbore portion, and a penetrating portion extending from the counterbore portion to an inner circumferential surface of the metallic shell. The ground electrode includes a fixing portion which is fixed to the counterbore portion, and an extension portion extending from the fixing portion. The extension portion has a flat surface which faces a forward end surface of the center electrode in the axial direction. The penetrating portion restricts the extension portion such that the flat surface of the extension portion faces toward a rear end side in the axial direction.

公开(公告)号：US11715933B2

公开(公告)日：2023-08-01

申请号：US17425522

申请日：2020-11-19

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Kenji Ban ,  Tatsuya Gozawa

IPC: H01T13/32 ,  H01T13/08 ,  H01T13/34

CPC classification number: H01T13/08 ,  H01T13/32 ,  H01T13/34

Abstract: A spark plug includes a center electrode, a tubular metallic shell which holds the center electrode therein in an insulated state, and a ground electrode which faces a forward end portion of the center electrode. The metallic shell has a penetration hole which penetrates the metallic shell in a direction intersecting an axial direction. The ground electrode has a press-fitted portion inserted into the penetration hole and fixed to the metallic shell, a projecting portion projecting toward an inner side of the metallic shell, and an insertion portion disposed between the press-fitted portion and the projecting portion, inserted into the penetration hole, and forming a space between the insertion portion and an inner surface of the penetration hole. An angle α formed between the inner surface of the penetration hole and an outer surface of the insertion portion falls within a range of 0°

公开(公告)号：US11695258B2

公开(公告)日：2023-07-04

申请号：US17790046

申请日：2020-08-27

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tatsuya Gozawa ,  Ritsuka Nakagawa

IPC: H01T13/54

CPC classification number: H01T13/54

Abstract: This spark plug includes a cap portion covering a center electrode and an end of a ground electrode from a front side. In a cross section including an axial line, where a pitch of an external thread of a metal shell is X (mm), an axial-line-direction distance between a crest of a rear-end ridge of a full thread portion of an external thread and a rear end of a contact portion of an insulator with which the metal shell contacts directly or via another member is A (mm), an axial-line-direction distance between the rear end of the contact portion and a front end of the insulator is B (mm), and an axial-line-direction distance between the rear end of the contact portion and a seating surface of the metal shell is C (mm), 0

公开(公告)号：US11424600B1

公开(公告)日：2022-08-23

申请号：US17668796

申请日：2022-02-10

Applicant: NGK Spark Plug Co., Ltd.

Inventor： Tatsuya Gozawa ,  Shunsuke Maeda ,  Daiki Goto

IPC: H01T13/54 ,  H01T21/02 ,  H01T13/06 ,  H01T13/16

Abstract: A spark plug includes a tubular metal shell; an insulator including a locking portion locked onto the metal shell; and a cap disposed at a front end side of the metal shell, the cap having a plurality of orifices. The plurality of orifices include orifices with different cross-sectional areas. A sum of the number of one or more largest orifices and the number of one or more large orifices that have a cross-sectional area of larger than or equal to 90% of the one or more largest orifices is smaller than the number of orifices that are other than the one or more largest orifices and the one or more large orifices. A length of the front end portion in an axial direction between a front end of the insulator and a front end of the locking portion is smaller than or equal to 12 mm.

公开(公告)号：US10944244B2

公开(公告)日：2021-03-09

申请号：US16815390

申请日：2020-03-11

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Kenji Ban ,  Tatsuya Gozawa

IPC: H01T13/06 ,  H01T13/32 ,  H01T21/02 ,  H01T13/39

Abstract: A spark plug includes a plug cap having a plurality of through holes. In a cross section including an axial line, the plug cap includes an enlarging portion in a portion of a region between a first imaginary straight line and a second imaginary straight line, the first imaginary straight line extending through a front end of the end portion of a ground electrode and being perpendicular to the axial line, the second imaginary straight line extending through a back end of one of inner open ends of the through holes that is closest to a front end of the spark plug and being perpendicular to the axial line. The enlarging portion being a portion in which a minimum distance from an outer surface to an inner surface of the plug cap increases with increasing distance in a direction from back to front.