公开(公告)号：US10186845B2

公开(公告)日：2019-01-22

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

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.

公开(公告)号：US10153621B2

公开(公告)日：2018-12-11

申请号：US15577389

申请日：2016-05-16

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Daisuke Sumoyama ,  Takuto Nakada

IPC: H01T13/39 ,  H01T13/20 ,  C22C5/04 ,  H01T13/32 ,  H01T21/02

Abstract: A spark plug having a tip provided on at least one of a center electrode and a ground electrode. The tip includes a body portion, a coating layer, and a high specific resistance layer. The body portion contains mostly Ir. The high specific resistance layer is provided on a side peripheral surface of the body portion, has a Ni content greater than the Ni content of the body portion and less than 50 mass %, and has a thickness of 2 μm or greater and 45 μm or less. The coating layer is provided on a side peripheral surface of the high specific resistance layer, contains 50 mass % or more of Ni, and has a thickness of 3 μm or greater and 20 μm or less. The tip has a specific resistance of 20×10−8 Ωm or less at room temperature.

公开(公告)号：US09948068B2

公开(公告)日：2018-04-17

申请号：US15036572

申请日：2014-09-10

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Daisuke Sumoyama ,  Tsutomu Shibata

IPC: H01T13/39 ,  C22C5/04 ,  C22C19/03 ,  B32B15/01 ,  C22C19/05

CPC classification number: H01T13/39 ,  B32B15/01 ,  B32B15/018 ,  C22C5/04 ,  C22C19/03 ,  C22C19/05 ,  C22C19/058

Abstract: A spark plug that includes a center electrode and a ground electrode. The center electrode is disposed providing a gap with the center electrode. At least one of the center electrode and the ground electrode includes a tip forming the gap. The tip includes a main body portion and a front surface layer. A composition of the main body portion is Pt as a main constituent and Rh of 5 mass % or more and Ni of 0 mass % or more to less than 8 mass %. The front surface layer is disposed at least at a surface radially outside of an axial line extending in a direction from a center of the main body portion to the gap. The front surface layer contains Ni of 8 mass % or more and has a thickness of 2 μm or more.

公开(公告)号：US09705292B2

公开(公告)日：2017-07-11

申请号：US15245583

申请日：2016-08-24

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tatsuya Gozawa ,  Daisuke Sumoyama ,  Tsutomu Shibata

IPC: H01T13/20 ,  H01T13/32 ,  H01T21/02 ,  H01T13/39

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

Abstract: A spark plug comprising a center electrode, a ground electrode disposed on the center electrode across a gap, and a tip joined to an opposed surface of the ground electrode that is opposed to the center electrode, the tip has a discharge layer and a relieving layer, the relieving layer is formed from a Pt—Ni alloy and joined to the opposed surface via a diffusion layer, the discharge layer is formed from a Pt—Rh alloy and joined via a clad diffusion layer to a side of the relieving layer opposite to a side of the relieving layer at which the ground electrode is joined, and 0.81≦A/B≦1.21 is satisfied when an average cross-sectional area of the discharge layer is A mm2 and an average cross-sectional area of the relieving layer is B mm2, and a method for producing the spark plug.

公开(公告)号：US09548593B2

公开(公告)日：2017-01-17

申请号：US15030718

申请日：2014-09-02

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tomonori Kanemaru ,  Daisuke Sumoyama ,  Osamu Yoshimoto

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

CPC classification number: H01T13/39 ,  H01T13/32

Abstract: A spark plug having a tip provided on at least one of a center electrode and a ground electrode. The spark plug includes a center electrode and a ground electrode disposed providing a gap with the center electrode. At least one of the center electrode and the ground electrode includes a tip forming the gap. The tip has a main constituent of Ir. The tip contains Rh of 7 mass % or more to 31 mass % or less, Ru of 5 mass % or more to 20 mass % or less, and Pt of one-twentieth or more to one-half or less of a Ru content.

Abstract translation: 一种火花塞，其具有设置在中心电极和接地电极中的至少一个上的尖端。 火花塞包括中心电极和设置成与中心电极间隙的接地电极。 中心电极和接地电极中的至少一个包括形成间隙的尖端。 尖端具有Ir的主要成分。 尖端包含7质量％以上至31质量％以下的Rh，5质量％以上至20质量％以下的Ru，Ru含量的二十分之一以上至二分之一以下的Pt。