公开(公告)号：US08878426B2

公开(公告)日：2014-11-04

申请号：US14182607

申请日：2014-02-18

Applicant: NGK Spark Plug Co., Ltd.

Inventor： Yasushi Sakakura ,  Yuichi Matsunaga

IPC: H01T13/20

CPC classification number: H01T13/20 ,  H01T13/08 ,  H01T13/36

Abstract: An ignition plug having enhanced seal performance, while suppressing deformation of a metallic shell thereof. The ignition plug includes a metallic shell having a crimp portion, a male screw portion, a seat portion, and a bent portion. The bent portion has a largest outer diameter (OD) portion, and first and second smallest OD portions, wherein 0.01≦(L2+L3−L1)/(L2+L3)≦0.3 is satisfied. L1 is distance between a point in the first smallest OD portion farthest from center axis and a point in the second smallest OD portion farthest from center axis, L2 is distance between the point in the first smallest OD portion farthest from center axis and a point in the largest OD portion farthest from center axis, and L3 is distance between the point in the second smallest OD portion farthest from center axis and the point in the largest OD portion farthest from center axis.

Abstract translation: 一种具有增强的密封性能的火花塞，同时抑制其金属壳的变形。 火花塞包括具有卷曲部分，阳螺纹部分，座部分和弯曲部分的金属壳体。 弯曲部分具有最大的外径（OD）部分，以及第一和第二最小的OD部分，其中满足0.01和nlE;（L2 + L3-L1）/（L2 + L3）＆nlE; 0.3。 L1是距离中心轴最远的第一最小OD部分中的点与距离中心轴最远的第二最小OD部分中的点之间的距离，L2是距离中心轴最远的第一最小OD部分中的点与距离中心轴最远的点之间的距离 距离中心轴最远的OD部分，L3是距离中心轴最远的第二最小OD部分中的点与最远离中心轴的最大OD部分中的点之间的距离。

公开(公告)号：US09837798B1

公开(公告)日：2017-12-05

申请号：US15481543

申请日：2017-04-07

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yuichi Yamada ,  Yuichi Matsunaga

IPC: H01T13/32 ,  H01T13/39 ,  H01T13/41 ,  H01T21/02

CPC classification number: H01T13/32 ,  H01T13/20 ,  H01T13/39 ,  H01T13/41 ,  H01T21/02

Abstract: A tip that contains a noble metal is joined to a joining surface of an electrode base material of a ground electrode via a welded portion. On cross-sections of the tip and the electrode base material in a longitudinal direction of the joining surface, the welded portion has a void above the joining surface, and a continuous distance of the welded portion on the joining surface is less than or equal to 0.5 mm, whereby thermal stress due to a difference in thermal expansion between the tip and the electrode base material can be reduced. A total of continuous distances of the welded portions on the joining surface, are 0.4 times to 0.8 times a length from an end of the tip to another end thereof, whereby joining strength of the welded portion can be assured. Peeling at the tip or falling-off of the tip due to thermal stress can be less likely to occur, whereby durability of the ground electrode can be improved.

公开(公告)号：US09525270B2

公开(公告)日：2016-12-20

申请号：US14896506

申请日：2014-03-06

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yuichi Matsunaga ,  Yasushi Sakakura

IPC: H01T13/20 ,  H01T13/32 ,  H01T13/39 ,  H01T13/54

CPC classification number: H01T13/32 ,  H01T13/16 ,  H01T13/39 ,  H01T13/467 ,  H01T13/54

Abstract: A spark plug (1) includes an insulator (2) having an axial hole (4), a center electrode (5) inserted into the axial hole (4), a metallic shell (3) provided around the insulator (2), a ground electrode (27) whose base end portion is fixed to the metallic shell (3) and which has an annular portion (27A) formed at a forward end portion thereof, the center electrode (5) being disposed radially inward of the annular portion (27A), and an annular tip (32) which is joined to the inner circumference of the annular portion (27A) and which forms a spark discharge gap (28) between the center electrode (5) and the inner circumferential surface of the annular tip (32). Recesses (35) are provided on at least one of the inner and outer circumferences of the annular portion (27A).

Abstract translation: 火花塞（1）包括具有轴向孔（4）的绝缘体（2），插入到轴向孔（4）中的中心电极（5），设置在绝缘体（2）周围的金属壳体（3） 接地电极（27），其基端部固定在金属壳（3）上，并且在其前端形成有环状部（27A），中心电极（5）位于环状部的径向内侧 27A），以及与环状部（27A）的内周接合并在中心电极（5）与环状端部的内周面之间形成火花放电间隙（28）的环形端部（32） （32）。 凹部（35）设置在环状部（27A）的内周和外周的至少一个上。

公开(公告)号：US20140239798A1

公开(公告)日：2014-08-28

申请号：US14182607

申请日：2014-02-18

Applicant: NGK Spark Plug Co., Ltd.

Inventor： Yasushi Sakakura ,  Yuichi Matsunaga

IPC: H01T13/20

CPC classification number: H01T13/20 ,  H01T13/08 ,  H01T13/36

Abstract: An ignition plug having enhanced seal performance, while suppressing deformation of a metallic shell thereof. The ignition plug includes a metallic shell having a crimp portion, a male screw portion, a seat portion, and a bent portion. The bent portion has a largest outer diameter (OD) portion, and first and second smallest OD portions, wherein 0.01≦(L2+L3−L1)/(L2+L3)≦0.3 is satisfied. L1 is distance between a point in the first smallest OD portion farthest from center axis and a point in the second smallest OD portion farthest from center axis, L2 is distance between the point in the first smallest OD portion farthest from center axis and a point in the largest OD portion farthest from center axis, and L3 is distance between the point in the second smallest OD portion farthest from center axis and the point in the largest OD portion farthest from center axis.

Abstract translation: 一种具有增强的密封性能的火花塞，同时抑制其金属壳的变形。 火花塞包括具有卷曲部分，阳螺纹部分，座部分和弯曲部分的金属壳体。 弯曲部分具有最大的外径（OD）部分，以及第一和第二最小的OD部分，其中满足0.01和nlE;（L2 + L3-L1）/（L2 + L3）＆nlE; 0.3。 L1是距离中心轴最远的第一最小OD部分中的点与距离中心轴最远的第二最小OD部分中的点之间的距离，L2是距离中心轴最远的第一最小OD部分中的点与距离中心轴最远的点之间的距离 距离中心轴最远的OD部分，L3是距离中心轴最远的第二最小OD部分中的点与最远离中心轴的最大OD部分中的点之间的距离。