公开(公告)号：US06265816B1

公开(公告)日：2001-07-24

申请号：US09301319

申请日：1999-04-29

申请人： Hirohito Ito ,  Hiroyuki Tanabe

发明人： Hirohito Ito ,  Hiroyuki Tanabe

IPC分类号： H01T1320

CPC分类号： H01T21/02 ,  H01T13/38

摘要： The invention provides a spark plug having an insulator which is composed mainly of alumina, and which is more superior in voltage endurance characteristics at high temperatures as compared with the prior-art materials. An insulator 2 of a spark plug 100 is made of an insulating material which is composed mainly of alumina, and which contains Al component within a range of 95 to 99.7 wt % in weight converted to Al2O3, and in which an area ratio occupied by alumina base principal-phase particles with particle size not less than 20 &mgr;m is not less than 50% as a cross-sectional structure of the insulator is observed. By making the alumina base principal-phase particles appropriately coarse like this, the voltage endurance characteristics of the insulator can be remarkably improved.

摘要翻译： 本发明提供一种具有主要由氧化铝构成的绝缘体的火花塞，与现有技术的材料相比，在高温下的耐电压性能更优异。 火花塞100的绝缘子2由绝缘材料制成，该绝缘材料主要由氧化铝组成，其中Al组分的重量在95至99.7重量％的范围内，转化为Al2O3，其中由氧化铝占据的面积比 观察到绝缘体的横截面结构，粒径不小于20μm的基底主相颗粒不小于50％。 通过使氧化铝基体主相颗粒适当地粗糙化，可以显着提高绝缘体的耐电压特性。

公开(公告)号：US06229253B1

公开(公告)日：2001-05-08

申请号：US09329311

申请日：1999-06-10

申请人： Kazuya Iwata ,  Takahiro Suzuki ,  Yoshihiro Matsubara

发明人： Kazuya Iwata ,  Takahiro Suzuki ,  Yoshihiro Matsubara

IPC分类号： H01T1320

CPC分类号： H01T13/467 ,  H01T13/32

摘要： In a spark plug, a main air gap (A) is formed between a parallel ground electrode (11) and the end face of a central electrode (2), a semi-surface gap (B) is formed between the end face (12C) of a semi-surface ground electrode (12) and the side face (2A) of the central electrode (2) and a semi-surface air gap (C) is formed between the end face (12C) and the side face (1E) of insulator. In addition, difference in a level E between the height of the lower end face (1D) of the insulator (1) and the height of the upper edge (12B) of the end face 12C of the semi-surface ground electrode 12 is E≦+0.7 mm, the distance B of the semi-surface gap (B) is longer than the distance A of the main air gap (A) and the distance C of the semi-surface air gap (C) and the insulator is shorter than the distance A of the main air gap (A).

摘要翻译： 在火花塞中，在平行接地电极（11）和中心电极（2）的端面之间形成有主气隙（A），在端面（12C）之间形成有半面间隙 ）和半平面气隙（C）之间形成半面接地电极（12）和中心电极（2）的侧面（2A）和半面空气间隙（C） ）绝缘子。 此外，绝缘体（1）的下端面（1D）的高度与半表面接地电极12的端面12C的上边缘（12B）的高度之间的电平差E为E 半面间隙（B）的距离B比主气隙（A）的距离A和半表面气隙（C）的距离C以及绝缘体的距离 短于主气隙（A）的距离A.

公开(公告)号：US06215234B1

公开(公告)日：2001-04-10

申请号：US09208272

申请日：1998-12-09

申请人： Nobuo Abe ,  Yasushi Kawashima

发明人： Nobuo Abe ,  Yasushi Kawashima

IPC分类号： H01T1320

CPC分类号： H01T13/32 ,  H01T13/20 ,  H01T13/39

摘要： A spark plug defines a spark gap G in a range of 0.2 mm≦G

摘要翻译： 火花塞在设置在中心电极上的贵金属芯片和接地电极之间限定了0.2mm <= G <0.4mm的范围内的火花隙G. 贵金属芯片具有面向接地电极的槽部，使得在火花隙G中设置有大于直径等于或大于0.4mm的球体的空间。结果，具有 可以在不被淬火的空间中保持等于或大于0.4mm的直径，导致火花塞的高点火性。

公开(公告)号：US06831397B2

公开(公告)日：2004-12-14

申请号：US10058430

申请日：2002-01-30

申请人： Keiji Kanao ,  Tsunenobu Hori

发明人： Keiji Kanao ,  Tsunenobu Hori

IPC分类号： H01T1320

CPC分类号： H01T21/02 ,  H01T13/39

摘要： A noble metal chip of which one end is welded to an earth electrode by laser has a sectional area of not less than 0.12 mm2 and not more than 1.15 mm2 at the other end. A length from the surface of the earth electrode to the top surface of the noble metal chip is not less than 0.3 mm and not more than 1.5 mm. An outer surface of the fused junction layer obtained by laser welding between the noble metal chip and the earth electrode has a concave surface, wherein the slope on the plane including the axis of the noble metal chip is curved with a radius R.

摘要翻译： 通过激光将一端焊接到接地电极的贵金属芯片在另一端具有不小于0.12mm 2且不大于1.15mm 2的截面积。 从接地电极的表面到贵金属芯片的上表面的长度不小于0.3mm且不大于1.5mm。 通过在贵金属芯片和接地电极之间的激光焊接而获得的熔融接合层的外表面具有凹面，其中包含贵金属芯片的轴线的平面上的斜率以半径R弯曲

公开(公告)号：US06819032B2

公开(公告)日：2004-11-16

申请号：US10168008

申请日：2002-06-13

申请人： Yoshihiro Matsubara

发明人： Yoshihiro Matsubara

IPC分类号： H01T1320

CPC分类号： H01T13/467 ,  H01T13/14 ,  H01T13/52

摘要： An object is to realize a spark plug which is less affected by “carbon fouling,” has a long service life, and exhibits excellent ignition characteristics. An air gap (&agr;) is formed between a parallel ground electrode 11 and an end face of a center electrode 2; a semi-creepage gap (&bgr;) is formed between an end face 12C of a semi-creeping discharge ground electrode 12 and a circumferential side surface 2A of the center electrode 2; and an insulator gap (&ggr;) is formed between the end face 12C and a circumferential side surface 1E of an insulator 1. The air gap (&agr;) and the semi-creepage gap (&bgr;) satisfy a relationship &agr; &ggr;. The air gap (&agr;) is not greater than 1.1 mm; the insulator gap (&ggr;) falls within a range of 0.5 mm to 0.7 mm; and a diametral difference (&dgr;) between the insulator and a metallic shell as measured at the front end face of the metallic shell is not less than 3.6 mm.

摘要翻译： 本发明的目的是实现较少受“碳污染”影响的火花塞，其使用寿命长，并且具有优异的点火特性。在平行接地电极11和端面之间形成气隙（α） 中心电极2; 在半爬电放电接地电极12的端面12C与中心电极2的周向侧面2A之间形成半爬电间隙（β） 并且在端面12C和绝缘体1的周向侧表面1E之间形成绝缘体间隙（γ）。气隙（α）和半爬电间隙（β）满足关系α< 并且气隙（α）和绝缘体间隙（γ）满足α>γ的关系。 气隙（α）不大于1.1mm; 绝缘体间隙（γ）落在0.5mm至0.7mm的范围内; 并且在金属壳的前端面处测量的绝缘体和金属壳之间的直径差（delta）不小于3.6mm。

公开(公告)号：US06798124B2

公开(公告)日：2004-09-28

申请号：US10046969

申请日：2002-01-17

申请人： Hiromi Hiramatsu

发明人： Hiromi Hiramatsu

IPC分类号： H01T1320

CPC分类号： H01T13/39

摘要： A spark plug is provided which consists of a center electrode retained within a metal shell and a ground electrode including a noble metal-made tip and a body joined to the metal shell. The noble metal-made tip is connected to the body through a fused portion that is a weld between the body and the noble metal-made tip. Portions of the noble metal-made tip and the fused portion closest to the tip of the center electrode are located within a range defined by a first line extending from the tip of the center electrode in a lateral direction of the center electrode and a second line extending from a portion of the center electrode closest to the ground electrode in a longitudinal direction of the center electrode so that they do not overlap with the tip of the center electrode both in the lateral and longitudinal directions of the center electrode.

摘要翻译： 提供火花塞，其由保持在金属壳内的中心电极和包括贵金属制成的尖端和接合到金属壳的主体的接地电极组成。 贵金属制成的尖端通过作为主体和贵金属制成的尖端之间的焊缝的熔接部分连接到主体。 贵金属制尖端部分和最接近中心电极尖端的熔接部分位于由中心电极的顶端在中心电极的横向延伸的第一线和第二线 从最靠近接地电极的中心电极的一部分沿中心电极的纵向方向延伸，使得它们在中心电极的横向和纵向方向上不与中心电极的尖端重叠。

公开(公告)号：US06707237B2

公开(公告)日：2004-03-16

申请号：US10216800

申请日：2002-08-13

申请人： Hideki Teramura ,  Mamoru Musasa ,  Junichi Kagawa

发明人： Hideki Teramura ,  Mamoru Musasa ,  Junichi Kagawa

IPC分类号： H01T1320

CPC分类号： H01T13/39 ,  H01T13/20

摘要： A spark plug is disclosed, in which a center electrode has, at the end thereof which forms a spark discharge gap, a noble metal chip which has a straight rod portion of 1.0 mm or less in diameter and 0.2 mm or more in length; width of coverage K of a ground electrode on which a rectangular noble metal chip is welded satisfies a relation of −d≦K≦0.5 mm (where, d represents the diameter of the end face of the center electrode); and width w of a portion of the discharge plane 111A which falls within a range corresponded to the axial extension of the end face 22B of the noble metal chip 22 provided on the center electrode 2 satisfies a relation of w

摘要翻译： 公开了一种火花塞，其中中心电极在形成火花放电间隙的端部具有直径为1.0mm或更小的直杆部分和长度为0.2mm或更大的直杆部分的贵金属芯片; 焊接矩形贵金属芯片的接地电极的覆盖宽度K满足-d <= K <= 0.5mm（其中，d表示中心电极的端面的直径）的关系; 并且放电平面111A的落在与设置在中心电极2上的贵金属芯片22的端面22B的轴向延伸相对应的范围内的宽度w满足w <2.1-K（以mm为单位）的关系 ），其中K是前述的覆盖宽度。

公开(公告)号：US06703770B2

公开(公告)日：2004-03-09

申请号：US10119716

申请日：2002-04-11

申请人： Akira Suzuki ,  Takahiro Suzuki ,  Kazumi Kawamura ,  Kazuya Iwata

发明人： Akira Suzuki ,  Takahiro Suzuki ,  Kazumi Kawamura ,  Kazuya Iwata

IPC分类号： H01T1320

CPC分类号： H01T13/08

摘要： A spark plug has a central electrode, an insulator surrounding the central electrode and a metallic shell retaining therein the insulator and provided with no thread thereon. The spark plug is clearance fitted in a plug hole of a cylinder head, without being screwed into the plug hole, in such a manner that a front end portion of the metallic shell is accommodated in a front end section of the plug hole with a clearance therebetween provided with a sealant so as to transmit heat from the spark plug to the cylinder head. The clearance is preferably given by the following expression: 0.005≦D−d1≦0.05, where D is an inner diameter (mm) of the front end section and d1 is an outer diameter (mm) of the front end portion. By this, the spark plug can be easily attached to the cylinder head and attain improved heat resistance.

摘要翻译： 火花塞具有中心电极，围绕中心电极的绝缘体和保持绝缘体并且在其上没有线的金属壳。 火花塞间隙安装在气缸盖的插头孔中，而不会被拧入插塞孔中，使得金属壳的前端部分容纳在插塞孔的前端部分中，间隙 其间设置有密封剂，以将热量从火花塞传递到气缸盖。 间隙优选由以下表达式给出：0.005 <= D-D1 <= 0.05，其中D是前端部分的内径（mm），d1是前端部分的外径（mm）。 由此，火花塞可以容易地附接到气缸盖并获得改善的耐热性。

公开(公告)号：US06700317B2

公开(公告)日：2004-03-02

申请号：US09818784

申请日：2001-03-28

申请人： Keiji Kanao ,  Kouzou Takamura

发明人： Keiji Kanao ,  Kouzou Takamura

IPC分类号： H01T1320

CPC分类号： H01T13/39 ,  H01T21/02

摘要： An iridium alloy firing tip, fixed to a center electrode, comprises a stem and a head. The firing tip head is integrally formed from one end of the stem. A distal end of the stem is opposed to an opponent electrode. The head is embedded in the opposing portion. The firing tip head is pointed or tapered in a direction opposite to the stem from a maximum diameter portion in such a manner that a cross-sectional area of the head continuously decreases with increasing distance from the maximum diameter portion. The maximum diameter portion is positioned deeply inside the opposing portion, and a base end of the stem extending from the maximum diameter portion is wrapped or surrounded by the opposing portion.

摘要翻译： 固定到中心电极的铱合金点火头包括杆和头。 射击头部从杆的一端整体形成。 杆的远端与对手电极相对。 头部嵌入相对部分。 点火尖头以与最大直径部分相反的杆的方向尖锐或渐缩，使得头部的横截面面积随着与最大直径部分的距离的增加而连续地减小。 最大直径部分位于相对部分的深处，并且从最大直径部分延伸的杆的基端由相对部分包裹或围绕。

公开(公告)号：US06664719B2

公开(公告)日：2003-12-16

申请号：US10106249

申请日：2002-03-27

申请人： Wataru Matsutani ,  Masayuki Segawa ,  Satoko Ito

发明人： Wataru Matsutani ,  Masayuki Segawa ,  Satoko Ito

IPC分类号： H01T1320

CPC分类号： H01T13/39

摘要： A spark plug having a discharge portion formed of a noble-metal chip, the spark plug being capable of restraining wear observed on a slenderized discharge portion in particular. Discharge portion (31) includes noble-metal chip (31′). Dimension D is 0.3-0.8 mm; and H is 0.4-2 mm, where D (mm) is a diameter representing the outside diameter of the noble-metal chip, and H (mm) is a discharge portion thickness representing the shortest distance between the periphery of a discharge face (31t) and a corresponding end edge of a weld zone W where a center electrode (3) and the noble-metal chip (31′) are welded. Further, the noble-metal chip (31′) contains a predominant amount of Ir and 0.5-8% by weight Ni.

摘要翻译： 一种具有由贵金属芯片形成的放电部分的火花塞，该火花塞特别能够抑制在细长的放电部分上观察到的磨损。 放电部（31）包括贵金属芯片（31'）。 尺寸D为0.3-0.8mm; H为0.4-2mm，其中D（mm）为代表贵金属芯片外径的直径，H（mm）为排出面（31t）的周边之间的最短距离的排出部分厚度 ）和焊接区域W的对应的端部边缘，其中中心电极（3）和贵金属芯片（31'）被焊接。 此外，贵金属片（31'）含有主要量的Ir和0.5-8重量％的Ni。