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。

公开(公告)号：US20220166196A1

公开(公告)日：2022-05-26

申请号：US17437679

申请日：2019-11-17

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Takashi SEKIZAWA ,  Tomokatsu KASHIMA ,  Yuya ONO ,  Yuki TOUMATSU ,  Yudai KAWAGUCHI ,  Kazuyoshi TORII

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

Abstract: A spark plug that can reduce variation in a discharge point. The spark plug includes: a center electrode; a metal shell insulating and holding the center electrode; and a ground electrode including a base material having one end portion connected to the metal shell, and a tip connected to another end portion of the base material. The tip has a discharge surface opposed to the center electrode with a spark gap therebetween. The discharge surface has a quadrangular shape and is chamfered at four sides thereof. Only a first side which is one of the four sides is provided with a C chamfer.

公开(公告)号：US20200244048A1

公开(公告)日：2020-07-30

申请号：US16742977

申请日：2020-01-15

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Takashi SEKIZAWA ,  Tomokatsu KASHIMA ,  Yasushi SAKAKURA

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

Abstract: A spark plug including a ground electrode including a base material, a tip having a discharge surface, and a melt portion interposed over an entire area between the tip and the base material and joining the tip to the base material; and a center electrode with a spark gap formed between the center electrode and the discharge surface. The tip has, in an inner area surrounded by an outer peripheral portion of the tip, a thin portion in which a distance between the discharge surface and the melt portion is shorter than a distance between the discharge surface and the melt portion in the outer peripheral portion. The thin portion extends from a part of the outer peripheral portion to a part other than the part of the outer peripheral portion.