公开(公告)号：US20180048126A1

公开(公告)日：2018-02-15

申请号：US15669536

申请日：2017-08-04

Applicant: NGK Spark Plug Co., LTD.

Inventor： Yutaka YOKOYAMA ,  Kuniharu TANAKA ,  Nobuyoshi ARAKI ,  Hirokazu KURONO ,  Toshimasa SAJI ,  Yusuke NOMURA ,  Jumpei ISASA

IPC: H01T13/38 ,  C04B35/10 ,  H01B3/12

CPC classification number: H01T13/38 ,  C04B35/10 ,  C04B35/111 ,  C04B35/62655 ,  C04B35/63416 ,  C04B2235/3206 ,  C04B2235/3208 ,  C04B2235/3213 ,  C04B2235/3215 ,  C04B2235/3217 ,  C04B2235/3222 ,  C04B2235/3418 ,  C04B2235/3481 ,  C04B2235/5436 ,  C04B2235/5445 ,  C04B2235/6565 ,  C04B2235/6567 ,  C04B2235/85 ,  H01B3/12

Abstract: An alumina-based sintered body includes 92 mass % to 96 mass % of Al in terms of an oxide, and at least three elements selected from Group II elements, one of the at least three elements being 1.90 mass % or more of Ba in terms of an oxide. The alumina-based sintered body includes the following phases in a grain boundary phase present between alumina crystal grains: a first crystal phase containing Si and at least one of the Group II elements, and a second crystal phase containing Al and at least one of the Group II elements. In X-ray diffraction of the alumina-based sintered body, the maximum relative intensity of the first crystal phase and the maximum relative intensity of the second crystal phase are both 2 or above relative to the maximum diffraction intensity of the alumina crystal.

公开(公告)号：US20170093134A1

公开(公告)日：2017-03-30

申请号：US15272807

申请日：2016-09-22

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yutaka YOKOYAMA ,  Kuniharu TANAKA ,  Katsuya TAKAOKA ,  Shun KONDO ,  Nobuyoshi ARAKI ,  Toshiki KON ,  Haruki YOSHIDA ,  Jumpei ISASA ,  Hirokazu KURONO ,  Hironori UEGAKI ,  Toshimasa SAJI ,  Yusuke NOMURA

IPC: H01T13/38

CPC classification number: H01T13/38 ,  H01T13/60

Abstract: A spark plug including an insulator containing not less than 92 mass % and not greater than 96 mass % of Al component in terms of oxide, wherein the insulator is formed from an alumina sintered body comprising alumina crystal and a grain boundary phase present between crystal grains of the alumina crystal. Assuming that mass contents of an Si component, an Mg component, a Ba component, and a Ca component in terms of oxide are represented by MSiO2, MMgO, MBaO, and MCaO, respectively, and a sum of MSiO2, MMgO, MBaO, and MCaO is represented by Mt, the grain boundary phase contains these components so as to satisfy conditions (1) to (4) as follows: (1) 0.17≦MSiO2/Mt≦0.47; (2) 0.005≦MMgO/Mt≦0.07; (3) 0.29≦MBaO/Mt≦0.77; (4) 0.03≦MCaO/Mt≦0.19.

公开(公告)号：US20170353013A1

公开(公告)日：2017-12-07

申请号：US15607714

申请日：2017-05-30

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Haruki YOSHIDA ,  Kuniharu TANAKA ,  Yutaka YOKOYAMA ,  Shun KONDO ,  Hirokazu KURONO ,  Toshimasa SAJI

IPC: H01T13/20 ,  H01T13/39 ,  H01T13/06

Abstract: A spark plug having an insulator with a leg portion whose outer circumferential surface has an arithmetic mean roughness Ra of 0.5 μm or less. The leg portion has a first section, a second section, and a third section. The first section has an outer diameter that decreases toward the forward end of the first section. The second section is located forward of and adjacent to the first section and its outer diameter decreases toward the forward end of the second section. The outer circumferential surface of the second section is located inward of a first straight line passing through the base and forward ends of the outer circumferential surface of the first section. The third section is located forward of and adjacent to the second section. The outer diameter of the third section is equal to or less than a forward end outer diameter Ds of the second section over the entire third section.

公开(公告)号：US20140091707A1

公开(公告)日：2014-04-03

申请号：US14042836

申请日：2013-10-01

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Toshimasa SAJI ,  Hirokazu KURONO ,  Toshitaka HONDA

IPC: H01T13/41

CPC classification number: H01T13/41 ,  H01T13/20 ,  H01T13/38

Abstract: An ignition plug, wherein, when a relative density of a portion of an insulator, which is positioned between a radial virtual plane including a front end of the insulator and a radial virtual plane including a front end of a portion of the insulator which is in contact with a metal shell or the plate packing, is referred to as A (%), and a relative density of a portion of the insulator, which is positioned between the radial virtual plane including the front end of the portion of the insulator which is in contact with the metal shell or the plate packing and a radial virtual plane including a center of a resistor in an axial direction, is referred to as B (%), the following equations are satisfied: 93.90≦A, and 0.10≦A−B≦0.90.

Abstract translation: 一种火花塞，其中当位于包括绝缘体的前端的径向虚拟平面和包括位于绝缘体的部分的前端的径向虚拟平面之间的绝缘体的一部分的相对密度时 与金属壳体或板状填料接触，称为A（％），绝缘子的一部分的相对密度位于包含绝缘子部分的前端的径向虚拟平面之间 与金属壳或板状填料接触，将包含电阻体的轴向中心的径向虚拟平面称为B（％），满足以下等式：93.90＆nlE; A，0.10＆nlE; A-B＆nlE; 0.90。