公开(公告)号：US08810118B2

公开(公告)日：2014-08-19

申请号：US13888467

申请日：2013-05-07

Applicant: NGK Spark Plug Co., Ltd.

Inventor： Nobuaki Sakayanagi

IPC: H01T13/20

CPC classification number: H01T13/20 ,  H01T13/32

Abstract: A spark plug includes a tubular insulator, a center electrode, a tubular metal shell, a ground electrode, and a pillar body tip. The tubular insulator has an axial hole penetrating in the direction of an axis. The pillar body tip includes one end face that is welded to the ground electrode and another end face that forms a gap with a front end portion of the center electrode. The ground electrode includes a part where the tip is to be welded. The surface forms a clearance with a part including a constituent material of the tip. The ground electrode includes a surface where a plating layer is disposed. The plating layer covers a surface excluding a formation part of the clearance. The clearance has a size A that is equal to or more than 0.01 mm and equal to or less than 0.5 mm.

Abstract translation: 火花塞包括管状绝缘体，中心电极，管状金属壳，接地电极和柱体末端。 管状绝缘体具有沿轴线方向贯穿的轴向孔。 柱体末端包括焊接到接地电极的一个端面和与中心电极的前端部分形成间隙的另一端面。 接地电极包括尖端要被焊接的部分。 表面与包括尖端的构成材料的部分形成间隙。 接地电极包括设置有镀层的表面。 电镀层覆盖除了间隙的形成部分之外的表面。 间隙的尺寸A等于或大于0.01mm且等于或小于0.5mm。

公开(公告)号：US09252569B2

公开(公告)日：2016-02-02

申请号：US14443764

申请日：2013-11-15

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Nobuaki Sakayanagi ,  Tomoaki Kato

IPC: H01T13/32

CPC classification number: H01T13/32 ,  F02M57/06 ,  H01T13/39 ,  H01T13/40

Abstract: A spark plug includes an insulator; a center electrode; a metallic shell; a ground electrode disposed at a forward end portion of the metallic shell and forming a gap in cooperation with a forward end portion of the center electrode; and a tip at least a portion of which is joined to at least the one of two side surfaces of the ground electrode which is disposed downstream with respect to fuel gas flow. In a first imaginary plane which contains a forward end surface of the center electrode and on which a discharge surface of the tip is projected, at least a portion of a projected image of the discharge surface is located within a range of 2.5G from the outer circumference of the forward end surface of the center electrode, where G (mm) is the size of the gap.

Abstract translation: 火花塞包括绝缘体; 中心电极; 金属壳; 接地电极，设置在所述金属壳的前端部，与所述中心电极的前端部配合形成间隙; 并且其末端的至少一部分连接到相对于燃料气体流动设置在下游的接地电极的至少两个侧表面中的至少一个侧表面。 在包含中心电极的前端面并且尖端的放电面投射到其上的第一假想平面中，放电表面的投影图像的至少一部分位于距离外部的2.5G的范围内 中心电极前端面的圆周，其中G（mm）是间隙的大小。

公开(公告)号：US09065255B2

公开(公告)日：2015-06-23

申请号：US13847770

申请日：2013-03-20

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Nobuaki Sakayanagi ,  Shinya Mitsuda ,  Tomoaki Kato ,  Ryuichi Ono

IPC: H01T13/20 ,  H01T21/02 ,  H01T13/32

CPC classification number: H01T13/32 ,  H01T21/02

Abstract: A spark plug includes: a rod-shaped center electrode extending in an axial direction; an insulator including a shaft hole that holds the center electrode inside of the shaft hole; a metal shell surrounding and holding a part of the insulator; and a ground electrode including a base end welded to the metal shell. The metal shell and the ground electrode are joined via a fusion portion formed by welding the ground electrode and the metal shell together. When the smallest thickness of the fusion portion in the axial direction is A, when, in a cross section that includes a center line of the ground electrode and is parallel to the axis, a length of a ground-electrode-side melted boundary formed between the fusion portion and the ground electrode is B, and when the ground electrode thickness is C, conditions of A≧0.2 mm and B>C are satisfied.

Abstract translation: 火花塞包括：沿轴向延伸的杆状中心电极; 绝缘体，其包括将所述中心电极保持在所述轴孔内部的轴孔; 围绕并保持绝缘体的一部分的金属壳; 以及包括焊接到金属壳的基端的接地电极。 金属壳和接地电极通过将接地电极和金属壳焊接在一起而形成的熔接部分接合。 当熔融部分的轴向最小厚度为A时，当在包括接地电极的中心线并且平行于轴线的横截面中，形成在接地电极侧熔融边界之间的长度 熔接部和接地电极为B，当接地电极厚度为C时，满足A≥0.2mm，B> C的条件。

公开(公告)号：US20150288149A1

公开(公告)日：2015-10-08

申请号：US14443764

申请日：2013-11-15

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Nobuaki Sakayanagi ,  Tomoaki Kato

IPC: H01T13/32

CPC classification number: H01T13/32 ,  F02M57/06 ,  H01T13/39 ,  H01T13/40

Abstract: A spark plug includes an insulator; a center electrode; a metallic shell; a ground electrode disposed at a forward end portion of the metallic shell and forming a gap in cooperation with a forward end portion of the center electrode; and a tip at least a portion of which is joined to at least the one of two side surfaces of the ground electrode which is disposed downstream with respect to fuel gas flow. In a first imaginary plane which contains a forward end surface of the center electrode and on which a discharge surface of the tip is projected, at least a portion of a projected image of the discharge surface is located within a range of 2.5G from the outer circumference of the forward end surface of the center electrode, where G (mm) is the size of the gap.

Abstract translation: 火花塞包括绝缘体; 中心电极; 金属壳; 接地电极，设置在所述金属壳的前端部，与所述中心电极的前端部配合形成间隙; 并且其末端的至少一部分连接到相对于燃料气体流动设置在下游的接地电极的至少两个侧表面中的至少一个侧表面。 在包含中心电极的前端面并且尖端的放电面投射到其上的第一假想平面中，放电表面的投影图像的至少一部分位于距离外部的2.5G的范围内 中心电极前端面的圆周，其中G（mm）是间隙的大小。

公开(公告)号：US20130278133A1

公开(公告)日：2013-10-24

申请号：US13847770

申请日：2013-03-20

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Nobuaki Sakayanagi ,  Shinya Mitsuda ,  Tomoaki Kato ,  Ryuichi Ono

IPC: H01T13/32

CPC classification number: H01T13/32 ,  H01T21/02

Abstract: A spark plug includes: a rod-shaped center electrode extending in an axial direction; an insulator including a shaft hole that holds the center electrode inside of the shaft hole; a metal shell surrounding and holding a part of the insulator; and a ground electrode including a base end welded to the metal shell. The metal shell and the ground electrode are joined via a fusion portion formed by welding the ground electrode and the metal shell together. When the smallest thickness of the fusion portion in the axial direction is A, when, in a cross section that includes a center line of the ground electrode and is parallel to the axis, a length of a ground-electrode-side melted boundary formed between the fusion portion and the ground electrode is B, and when the ground electrode thickness is C, conditions of A≧0.2 mm and B >C are satisfied.

Abstract translation: 火花塞包括：沿轴向延伸的杆状中心电极; 绝缘体，其包括将所述中心电极保持在所述轴孔内部的轴孔; 围绕并保持绝缘体的一部分的金属壳; 以及包括焊接到金属壳的基端的接地电极。 金属壳和接地电极通过将接地电极和金属壳焊接在一起而形成的熔接部分接合。 当熔融部分的轴向最小厚度为A时，当在包括接地电极的中心线并且平行于轴线的横截面中，形成在接地电极侧熔融边界之间的长度 熔接部和接地电极为B，当接地电极厚度为C时，满足A> = 0.2mm，B> C的条件。