公开(公告)号：US20200106246A1

公开(公告)日：2020-04-02

申请号：US16549250

申请日：2019-08-23

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tatsuya GOZAWA

IPC: H01T13/18 ,  H01T13/54

Abstract: A spark plug includes: an insulator with an axial hole; a center electrode held in a front end side of the axial hole; a cylindrical metal shell disposed around the insulator and having a seal part brought into contact with an outer circumferential surface of the insulator; a ground electrode arranged to form a gap with the center electrode; and a cap connected to a front end part of the metal shell to define therein an auxiliary combustion space in which the gap is formed, the cap having at least one through hole formed to provide communication between the auxiliary combustion space and the outside, wherein the condition (B/A)≤0.25 is satisfied where A represents a volume of an imaginary space defined at a position frontward of the seal part; and B represents a volume of parts of the ground and center electrodes located in the imaginary space.

公开(公告)号：US20200014175A1

公开(公告)日：2020-01-09

申请号：US16455939

申请日：2019-06-28

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tatsuya GOZAWA

IPC: H01T13/32 ,  H01T13/54

Abstract: A spark plug includes: a center electrode; an insulating member; a metal shell; a ground electrode; and a cap covers an opening of the metal shell on the front end side to define an auxiliary combustion space in which the gap is disposed, a first angle being formed by a second line and a first tangent line, a second angle being formed by the second line and a second tangent line, the second angle being greater than the first angle, and at least a portion of the opening of the specific through hole on the auxiliary combustion space side being positioned on a range of the second angle.

公开(公告)号：US20170187170A1

公开(公告)日：2017-06-29

申请号：US15315105

申请日：2015-05-26

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Daisuke SUMOYAMA ,  Tatsuya GOZAWA ,  Magoki SHIMADATE ,  Yusuke KAWASHIMA

IPC: H01T13/39 ,  H01T13/32

CPC classification number: H01T13/39 ,  H01T13/32

Abstract: An electrode tip for a spark plug, wherein Pt is contained as a main component, 7% by mass or more of Rh is contained, and a total content of Pt and Rh is greater than or equal to 95% by mass. The electrode tip includes: a narrow portion having the same cross-sectional shape in a direction of an axis; and a wide portion which is adjacent to the narrow portion and has a cross-sectional area, in a radial direction, which is greater than the narrow portion.