公开(公告)号：US20100264803A1

公开(公告)日：2010-10-21

申请号：US12741901

申请日：2008-11-20

申请人： Kenji Nunome ,  Hiroaki Kuki ,  Hiroyuki Kameda ,  Kazumasa Yoshida

发明人： Kenji Nunome ,  Hiroaki Kuki ,  Hiroyuki Kameda ,  Kazumasa Yoshida

IPC分类号： H01T13/20 ,  H01T21/02

CPC分类号： H01T13/39 ,  H01T21/02

摘要： A spark plug including a center electrode and a ground electrode. A center electrode noble metal tip is joined to a leading end portion of a center electrode, and a ground electrode noble metal tip is joined to a center-electrode-side side surface of the ground electrode. A distal end portion of the ground electrode noble metal tip protrudes from a distal-end surface of the ground electrode by 0.1 mm to 1.5 mm. A center-electrode-side side surface of the ground electrode noble metal tip projects from a center-electrode-side side surface by 0.15 mm to 0.6 mm. The ground electrode includes chamfered portions. Thickness lengths and widthwise lengths of the respective chamfered portions achieved within a cross section perpendicular to a center axis of the ground electrode are set to 0.2 mm or more.

摘要翻译： 一种包括中心电极和接地电极的火花塞。 中心电极用贵金属电极头接合于中心电极的前端部，接地电极用贵金属电极头接合于接地电极的中心电极侧面。 接地电极用贵金属电极头的前端部从接地电极的前端面突出0.1mm〜1.5mm。 接地电极用贵金属电极头的中心电极侧面从中心电极侧面突出0.15mm〜0.6mm。 接地电极包括倒角部分。 在与接地电极的中心轴垂直的截面内实现的各个倒角部的厚度长度和宽度方向的长度设定为0.2mm以上。

公开(公告)号：US06759795B2

公开(公告)日：2004-07-06

申请号：US10372800

申请日：2003-02-26

申请人： Kenichi Kumagai ,  Makoto Yamaguchi ,  Hiroaki Kuki

发明人： Kenichi Kumagai ,  Makoto Yamaguchi ,  Hiroaki Kuki

IPC分类号： H01T1320

CPC分类号： H01T13/39 ,  H01T13/32

摘要： A spark plug having a tubular metallic shell (1), an insulator (2) fitted into the metallic shell (1), a center electrode (3) provided in the insulator (2), and a ground electrode (4), one end of the ground electrode (4) being joined to the metallic shell (1) by means of welding or a like process, and a spark discharge gap (g) being formed between the other end portion of the ground electrode (4) and the center electrode (3), the spark plug being further characterized in that: the ground electrode (4) has an electrode base metal (4a), a Cu-based heat transfer acceleration element (4c) embedded in the electrode base metal (4a) and formed predominantly from Cu, and a noble metal chip (32) welded to the electrode base metal (4a) at a position facing the spark discharge gap (g); and the electrode base metal (4a) is an Ni alloy containing Cr in an amount of 14%-17% by mass, Mo in an amount of 0.8%-3.5% by mass, and Ni in an amount of 68%-85.2% by mass. In a second embodiment, the ground electrode (4) has a diffusion layer formed in a boundary between the electrode base metal (4a) and the Cu-based heat transfer acceleration element (4c), and the electrode base metal (4a) contains C in an amount not greater than 0.3% by mass.

摘要翻译： 一种火花塞，其具有管状金属壳（1），安装在金属壳（1）中的绝缘体（2），设置在绝缘体（2）中的中心电极（3）和接地电极（4），一端 的接地电极（4）通过焊接或类似工艺接合到金属壳（1），并且在接地电极（4）的另一端部和中心部之间形成火花放电间隙（g） 电极（3），其特征在于，所述接地电极（4）具有电极基体金属（4a），嵌入所述电极基体金属（4a）中的Cu系传热加速元件（4c） 主要由Cu形成，以及在面向火花放电间隙（g）的位置处焊接到电极母材（4a）的贵金属芯片（32）。 电极母材（4a）为含有14质量％〜17质量％的Cr，0.8〜3.5质量％的Mo，68％〜85.2质量％的Ni的Ni合金， 的质量。 在第二实施例中，接地电极（4）具有形成在电极基体金属（4a）和Cu系传热加速元件（4c）之间的边界的扩散层，电极基体金属（4a）含有C 的量不大于0.3质量％。

公开(公告)号：US20070126330A1

公开(公告)日：2007-06-07

申请号：US10583252

申请日：2004-12-15

申请人： Hiroaki Kuki ,  Akira Suzuki ,  Yoshihiro Matsubara ,  Kazuhiko Mori

发明人： Hiroaki Kuki ,  Akira Suzuki ,  Yoshihiro Matsubara ,  Kazuhiko Mori

IPC分类号： H01T13/20

CPC分类号： H01T13/36 ,  H01T13/16

摘要： There is provided a spark plug wherein an insulator and a metallic shell, when observed in a section made by a plane including an axis of a spark plug, have therebetween a gap of less than 0.45 mm at a more front end side than an engagement position of a packing and a first insulator stepped portion, and the gap is provided axially from a most front end side engagement position of the packing and a first insulator stepped portion as a starting point to a finishing point that is apart from the starting point by 1.2 mm or more toward the front end side while being apart from a front end surface of the metallic shell by 7.9 mm or more toward a rear end side.

摘要翻译： 提供了一种火花塞，其中当在由包括火花塞的轴线的平面制成的部分中观察时，绝缘体和金属壳在其前端侧的接合位置之间具有小于0.45mm的间隙 并且所述间隙从所述衬垫的最前端侧接合位置轴向设置，所述间隙作为起始点设置在与所述起始点相距1.2的终点处的第一绝缘体台阶部 mm以上朝向前端侧，同时从后端侧朝向金属壳的前端面离开7.9mm以上。

公开(公告)号：US06472801B1

公开(公告)日：2002-10-29

申请号：US09603612

申请日：2000-06-26

申请人： Yoshihiro Matsubara ,  Shoichiro Ito ,  Yuji Hirano ,  Naomichi Miyashita ,  Hiroaki Kuki

发明人： Yoshihiro Matsubara ,  Shoichiro Ito ,  Yuji Hirano ,  Naomichi Miyashita ,  Hiroaki Kuki

IPC分类号： H01T1320

CPC分类号： H01T13/52

摘要： In a creeping discharge type spark plug, the firing surface forming portions of a center electrode and a ground electrode are made of a metallic material containing a corrosion impeding component consisting of one or more of Fe, Cr and Cu. The spark plug is attached to an internal combustion engine. When it is operated under conditions of a predetermined high speed and high load, a corrosion impeding layer containing a corrosion impeding component is formed on the surface of the top end of an insulating member, with progression of spark discharge in spark discharge gaps. The corrosion impeding layer thus formed protects the center electrode from the attack by the creeping discharge spark. Therefore, the channeling is considerably effectively prevented or restricted.

摘要翻译： 在蠕变放电型火花塞中，中心电极和接地电极的烧成面形成部分由含有由Fe，Cr和Cu中的一种或多种组成的防腐蚀部件的金属材料制成。 火花塞连接在内燃机上。 当其在预定的高速和高负载的条件下运行时，在绝缘构件的顶端的表面上形成包含防腐蚀部件的防腐层，伴随着火花放电间隙的火花放电。 这样形成的防腐层可以保护中心电极免受蠕变放电火花的攻击。 因此，有效地防止或限制了渠道化。