公开(公告)号：US20220360051A1

公开(公告)日：2022-11-10

申请号：US17425522

申请日：2020-11-19

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Kenji BAN ,  Tatsuya GOZAWA

IPC: 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：US20200295540A1

公开(公告)日：2020-09-17

申请号：US16815390

申请日：2020-03-11

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Kenji BAN ,  Tatsuya GOZAWA

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

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.

公开(公告)号：US20180288864A1

公开(公告)日：2018-10-04

申请号：US15938368

申请日：2018-03-28

Applicant: NGK Spark Plug Co., LTD.

Inventor： Kohei USAMI ,  Kenji BAN

IPC: H05H1/52

CPC classification number: H05H1/52 ,  H01T13/20 ,  H01T13/32 ,  H01T13/34 ,  H01T13/52

Abstract: An ignition plug includes a center electrode; a cylindrical insulator that surrounds at least the circumference of a front end portion of the center electrode and that includes a bottom portion at the front side; and a cylindrical metal shell that holds the insulator from the outer circumference side. The center electrode includes a shaft portion that extends along an axial line and a head portion disposed at a front end of the shaft portion. The head portion has a width greater than that of the shaft portion in the radial direction. The insulator includes a first and second insulator. The first insulator has an axial hole and a diameter smaller than the maximum diameter of the head portion. The second insulator is joined to the first insulator. The shaft portion is disposed in the axial hole of the first insulator. The second insulator encloses the head portion.

公开(公告)号：US20170279249A1

公开(公告)日：2017-09-28

申请号：US15461576

申请日：2017-03-17

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yuichi YAMADA ,  Kenji BAN

IPC: H01T15/00 ,  H01T13/05 ,  F02P13/00

CPC classification number: H01T15/00 ,  F02P13/00 ,  H01T13/05 ,  H01T13/41

Abstract: An ignition system that uses a technique capable of restraining radiation of noise caused by discharge of a spark plug in the ignition system. The ignition system includes a spark plug and a power supply section. The spark plug is attached to an engine head. The power supply section has a battery having a ground terminal, and an ignition coil which transforms a voltage of the battery and supplies a transformed voltage to the spark plug. In the ignition system, a metallic shell of the spark plug is fixed to the engine head while being electrically insulated from the engine head through an insulator an electrically conductive path is connected to the metallic shell, and the electrically conductive path is electrically connected to the ground terminal of the battery while being electrically insulated from the engine head.

公开(公告)号：US20170117686A1

公开(公告)日：2017-04-27

申请号：US15298287

申请日：2016-10-20

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Kenji BAN ,  Kohei USAMI

IPC: H01T13/39 ,  H01T15/00 ,  H01T13/40

CPC classification number: H01T13/39 ,  H01T13/32 ,  H01T13/40 ,  H01T15/00

Abstract: A spark plug having a ground electrode, a noble metal tip having a front end that projects forward of a front end portion of the ground electrode, and a center electrode. When S1 represents an area of an overlap region in which a region onto which the center electrode is projected overlaps a region onto which the noble metal tip is projected when the center electrode and the noble metal tip are projected onto an imaginary plane perpendicular to a center line of the center electrode, and S2 represents an area of an overlap region in which a region onto which the noble metal tip is projected overlaps a region onto which the ground electrode is projected when the noble metal tip and the ground electrode are projected onto the imaginary plane, 0.22≦S1/S2≦0.68 is satisfied.

公开(公告)号：US20160157332A1

公开(公告)日：2016-06-02

申请号：US14948910

申请日：2015-11-23

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Kenji BAN ,  Hiroyuki KAMEDA ,  Kohei USAMI

IPC: H05H1/52 ,  H01T15/00 ,  H01T13/20

CPC classification number: H05H1/52 ,  H01T13/20 ,  H01T13/50 ,  H01T13/52 ,  H01T15/00

Abstract: A non-thermal equilibrium plasma ignition plug including a tubular metallic shell having an axial hole extending along an axial line, an insulator disposed in such a manner as to form a gap in cooperation with a wall surface of the axial hole at a forward end portion of the metallic shell, and a center electrode held at the center of the insulator, and generates nonequilibrium plasma in response to voltage applied thereto from a power supply. The insulator has a plurality of depressions or protrusions formed on a surface thereof which faces a discharge space therearound.

Abstract translation: 一种非热平衡等离子火花塞，其包括具有沿轴线延伸的轴向孔的管状金属壳，绝缘体，其设置成与前端部的轴孔的壁面形成间隙 的金属外壳和保持在绝缘体中心的中心电极，并且响应于从电源施加到其上的电压而产生非平衡等离子体。 绝缘体在其表面上形成有多个凹陷或突起，其面向其周围的放电空间。

公开(公告)号：US20140145624A1

公开(公告)日：2014-05-29

申请号：US14087412

申请日：2013-11-22

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Kenji BAN ,  Tatsunori YAMADA ,  Tomokatsu KASHIMA ,  Katsutoshi NAKAYAMA

IPC: H01T15/00

CPC classification number: H01T15/00 ,  F02P3/01 ,  F02P3/04 ,  F02P23/04 ,  F02P23/045

Abstract: An ignition system includes an ignition plug, a discharge power supply for applying a high voltage to the gap of the ignition plug, a high-frequency power supply for supplying a high-frequency current to the gap, a matching unit provided between the ignition plug and the high-frequency power supply, and a mixer through which currents output from the two power supplies flow. An oscillation frequency fs (Hz) which maximizes the current flowing between the matching unit and the mixer when spark discharge is generated and an oscillation frequency fo (Hz) which maximizes the current flowing between the matching unit and the mixer when spark discharge is not generated satisfy a relation fs/fo≧0.85. Thus, a current whose oscillation frequency is equal to the oscillation frequency fs flows between the matching unit and the mixer when spark discharge is not generated.

Abstract translation: 点火系统包括火花塞，用于向火花塞的间隙施加高电压的放电电源，用于向间隙提供高频电流的高频电源;设置在火花塞之间的匹配单元 和高频电源以及从两个电源输出的电流流过的混频器。 当不产生火花放电时，使匹配单元和混合器之间流动的电流最大化的振荡频率fs（Hz），以及当不产生火花放电时使匹配单元和混合器之间的电流最大化的振荡频率fo（Hz） 满足关系fs /fo≥0.85。 因此，当不产生火花放电时，其振荡频率等于振荡频率fs的电流在匹配单元和混合器之间流动。