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公开(公告)号：US20180374601A1
公开(公告)日：2018-12-27
申请号：US16015967
申请日：2018-06-22
发明人： Haruki YOSHIDA , Kuniharu TANAKA , Shun KONDO , Yutaka YOKOYAMA , Yusuke NOMURA , Michitaka YAMADA
IPC分类号： H01B3/12 , H01T13/38 , C04B35/117
CPC分类号： H01B3/12 , C04B35/111 , C04B35/117 , C04B2235/3201 , C04B2235/3206 , C04B2235/3208 , C04B2235/3215 , C04B2235/3217 , C04B2235/3227 , C04B2235/3418 , C04B2235/72 , C04B2235/725 , C04B2235/77 , C04B2235/781 , C04B2235/785 , C04B2235/85 , C04B2235/96 , H01T13/38 , H01T13/60
摘要： The spark plug includes an insulator made from an alumina-based sintered body, and the insulator contains 90 to 98 wt % of an Al component in oxide equivalent. The insulator contains 1 to 5 wt % of an Si component, 0.1 to 1 wt % of an Mg component, 2 wt % or less of a Ca component, 0.3 to 6 wt % of a Ba component, and 0.11 to 5 wt % of a rare earth component, in oxide equivalent. In analysis using a scanning transmission electron microscope with a probe diameter of an electron beam set at 1 nm, Si and a rare earth element are detected at a crystal grain boundary having a thickness of 15 nm or less, and an alkaline earth metal at the crystal grain boundary is less than a detection limit.
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公开(公告)号：US20170353013A1
公开(公告)日：2017-12-07
申请号：US15607714
申请日：2017-05-30
发明人： Haruki YOSHIDA , Kuniharu TANAKA , Yutaka YOKOYAMA , Shun KONDO , Hirokazu KURONO , Toshimasa SAJI
摘要： 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.
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公开(公告)号：US20170093133A1
公开(公告)日：2017-03-30
申请号：US15272561
申请日：2016-09-22
发明人： Haruki YOSHIDA , Jumpei ISASA , Toshitaka HONDA , Yutaka YOKOYAMA , Kuniharu TANAKA , Nobuyoshi ARAKI , Toshiki KON
摘要： A spark plug includes an insulator, a center electrode, a metallic shell, and a ground electrode. The insulator contains not less than 90.0 mass % and not greater than 98.1 mass % of Al2O3 with respect to a total mass of elements, as reduced to oxides, contained in the insulator, and has a porosity not greater than 5%. Assuming that a porosity of the insulator after a heat treatment is B, a difference (B−A) of the porosities before and after the heat treatment is not greater than 3.5%. In the heat treatment, the insulator is placed in a furnace, and a temperature in the furnace is increased from a room temperature to 1400° C. at a temperature increase rate of 7° C./min and is held at 1400° C. for 30 minutes, and thereafter, the temperature is decreased from 1400° C. to 400° C. at a temperature decrease rate of 10° C. or less per 5 minutes and is decreased to the room temperature.
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公开(公告)号：US20170018909A1
公开(公告)日：2017-01-19
申请号：US15204148
申请日：2016-07-07
发明人： Kengo FUJIMURA , Haruki YOSHIDA
摘要： A spark plug with an insulator that includes: a first portion having a first inner diameter with a front end of a trunk portion of a metal terminal disposed therein; a second portion having a second inner diameter larger than the first inner diameter, and including a portion 1 mm or more forward of a rear end of the insulator; and a third portion disposed between the first portion and the second portion and having a third inner diameter larger than the first inner diameter and smaller than the second inner diameter. The trunk portion of the metal terminal includes: a front trunk portion and a rear trunk portion with a front end of the rear trunk portion positioned forward of a rear end of the third portion of the insulator, the rear trunk portion having an outer diameter larger than the outer diameter of the front trunk portion.
摘要翻译： 一种具有绝缘体的火花塞，包括：具有第一内径的第一部分，其中设置有金属端子的主体部分的前端; 第二部分具有比第一内径大的第二内径，并且包括绝缘体的后端的前方的1mm以上的部分; 以及设置在所述第一部分和所述第二部分之间并且具有大于所述第一内径并且小于所述第二内径的第三内径的第三部分。 金属端子的主体部分包括：前主体部分和后主体部分，其后部主体部分的前端位于绝缘体的第三部分的后端的前方，后部主体部分具有较大的外径 比前躯干部的外径大。
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公开(公告)号：US20160087410A1
公开(公告)日：2016-03-24
申请号：US14856777
申请日：2015-09-17
发明人： Jumpei KITA , Haruki YOSHIDA
摘要： A spark plug having an insulator that includes a first portion which accommodates a front end of the metallic terminal. A portion of the metallic terminal has a roughened surface portion with a Vickers hardness of 200 Hv or greater and 320 Hv or smaller. A first ratio of an outside diameter of the roughened surface corresponding to at least a part of the first portion of the insulator to the first bore diameter of the insulator is 0.90 or greater. A second ratio of the first bore diameter to the second bore diameter of the insulator is 0.80 or greater and 0.98 or smaller.
摘要翻译： 一种具有绝缘体的火花塞，包括容纳金属端子前端的第一部分。 金属端子的一部分具有维氏硬度为200Hv或更大且320Hv或更小的粗糙表面部分。 对应于绝缘体的第一部分的至少一部分的粗糙表面的外径与绝缘体的第一孔直径的第一比率为0.90或更大。 绝缘体的第一孔径与第二孔径的第二比例为0.80以上且0.98以下。
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公开(公告)号：US20150349498A1
公开(公告)日：2015-12-03
申请号：US14723506
申请日：2015-05-28
发明人： Katsuya TAKAOKA , Kazuhiro KUROSAWA , Kuniharu TANAKA , Haruki YOSHIDA , Hirokazu KURONO , Toshitaka HONDA
IPC分类号： H01T13/04
摘要： A spark plug including an insulator having an axial hole, a center electrode held at one end side and a terminal electrode held at the other end side of the axial hole, an electrical connection portion electrically connecting the center electrode and the terminal electrode inside the axial hole, wherein the electrical connection portion includes a conductor including a ceramic phase and a metal wire having a spiral structure portion, wherein the metal wire has a wire diameter of 0.1 mm or greater and 0.5 mm or smaller, and wherein the spiral structure portion of the metal wire is configured such that an outer diameter thereof is 1.0 mm or greater and 3 mm or smaller, a pitch thereof is 0.3 mm or greater and 1 mm or smaller, and a height thereof is 8 mm or greater and 30 mm or smaller.
摘要翻译： 一种火花塞，其包括具有轴孔的绝缘体，一端保持的中心电极和保持在所述轴孔的另一端侧的端子电极，在所述轴向孔内电连接所述中心电极和所述端子电极的电连接部 其特征在于，所述电连接部包括具有陶瓷相的导体和具有螺旋结构部的金属线，所述金属线的线径为0.1mm以上且0.5mm以下，其特征在于， 金属线的外径为1.0mm以上且3mm以下，间距为0.3mm以上且1mm以下，高度为8mm以上且30mm以下 。
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公开(公告)号：US20210257816A1
公开(公告)日：2021-08-19
申请号：US17275054
申请日：2020-06-23
发明人： Hiroki SHIMADA , Haruki YOSHIDA , Naoya HARATA
摘要： An insulator for a spark plug including a first portion; a second portion located on the rear side of the first portion, an outer diameter F at a front end of the second portion being smaller than an outer diameter of the first portion; a third portion located on the front side of the first portion, an outer diameter D at a rear end of the third portion being smaller than the outer diameter of the first portion and the outer diameter F at the front end of the second portion; a first slope portion connecting the first portion and the second portion; and a second slope portion connecting the first portion and the third portion. A length A of the second slope portion and a length B of the first slope portion satisfy 2.0≤A/B≤3.9, and 0.50≤D/F≤0.88 is satisfied.
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公开(公告)号：US20190131776A1
公开(公告)日：2019-05-02
申请号：US16095788
申请日：2017-05-25
发明人： Jumpei ISASA , Seiji NAKANO , Hirokazu KURONO , Kuniharu TANAKA , Yutaka YOKOYAMA , Haruki YOSHIDA , Shun KONDO
摘要： Provided is a spark plug capable of ensuring fouling resistance with a simple configuration. An insulator includes a step portion formed on an outer circumferential surface thereof. A center electrode is arranged in an axial hole of the insulator. A cylindrical metal shell having a shelf portion formed on an inner circumferential surface thereof is arranged radially outside the insulator. The insulator further includes a front end portion located frontward of the step portion. An outer circumferential surface of the front end portion has an arithmetic average roughness of 0.5 μm or smaller in a circumferential direction. A recess is formed with a depth of 3 to 20 μm in at least part of an end surface and the outer circumferential surface of the front end portion so as to extend from the front toward the rear.
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公开(公告)号：US20160322789A1
公开(公告)日：2016-11-03
申请号：US15108075
申请日：2014-12-25
发明人： Katsuya TAKAOKA , Kazuhiro KUROSAWA , Kuniharu TANAKA , Toshitaka HONDA , Hirokazu KURONO , Haruki YOSHIDA , Hironori UEGAKI
摘要： A connection portion connecting a center electrode and a terminal metal fixture together in a through hole of the insulator includes a resistor and a magnetic substance structure including a magnetic substance and a conductor The connection portion further includes a first conductive sealing portion, a second conductive sealing portion and a third conductive sealing portion. The first conductive sealing portion is disposed on a leading end side of a first member and is in contact therewith. The second conductive sealing portion is disposed between the first member and a second member and is in contact with the first member and the second member. The third conductive sealing portion is disposed on a rear end side of the second member and is in contact therewith.
摘要翻译： 在绝缘子的通孔中连接中心电极和端子金属固定器的连接部分包括电阻器和包括磁性物质和导体的磁性物质结构。连接部分还包括第一导电密封部分，第二导电密封部分 部分和第三导电密封部分。 第一导电密封部分设置在第一构件的前端侧并与其接触。 第二导电密封部分设置在第一构件和第二构件之间并与第一构件和第二构件接触。 第三导电密封部分设置在第二构件的后端侧并与其接触。
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公开(公告)号：US20160204580A1
公开(公告)日：2016-07-14
申请号：US14912753
申请日：2014-08-08
发明人： Haruki YOSHIDA , Takamitsu MIZUNO , Masaaki KUMAGAI , Jumpei KITA , Yoshitomo IWASAKI , Toshitaka HONDA
摘要： A spark plug includes an insulator having an axial hole, a center electrode inserted into a forward portion of the axial hole, a terminal electrode inserted into a rear portion of the axial hole, and an interelectrode insert which contains glass and electrically conductive carbon and is disposed in the axial hole between the center electrode and the terminal electrode. The interelectrode insert has a resistance of 1.0 kΩ to 3.0 kΩ, and the interelectrode insert has a carbon content of 1.5% by mass to 4.0% by mass at a forward portion located forward of a center point between the rear end of the center electrode and the forward end of the terminal electrode. Furthermore, the forward portion is lower in resistance than a rear portion of the interelectrode insert located rearward of the center point.
摘要翻译： 火花塞包括具有轴向孔的绝缘体，插入到轴向孔的前部的中心电极，插入到轴向孔的后部的端子电极和包含玻璃和导电性碳的电极间插入件 设置在中心电极和端子电极之间的轴向孔中。 电极间插入物的电阻为1.0 k＆OHgr; 至3.0kΩ，并且电极间插入物在位于中心电极的后端和端子电极的前端之间的中心点的前部的碳含量为1.5质量％至4.0质量％。 此外，前部的电阻低于位于中心点后方的电极间插入件的后部。
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