Spark plug
US-9627857-B2 · Apr 18, 2017 · US
Spark plug
US10090646B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10090646-B2 |
| Application number | US-201515315581-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 2, 2015 |
| Priority date | Jun 24, 2014 |
| Publication date | Oct 2, 2018 |
| Grant date | Oct 2, 2018 |
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- Title
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Abstract
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Disclosed is a spark plug capable of suppressing high-frequency noise by improving the material of an electrical connection part between a center electrode and a metal terminal within an axial hole of an insulator. A spark plug has an electrical connection part arranged in an axial hole of an insulator to establish electrical connection between a center electrode and a metal terminal. The electrical connection part includes a conductor having a first crystal phase formed of a Fe-containing oxide and a second crystal phase formed of a conductive metal oxide of perovskite crystal structure.
First claim
Opening claim text (preview).
The invention claimed is: 1. A spark plug, comprising: an insulator having an axial hole formed in an axis direction of the spark plug; a center electrode retained in one end side of the axial hole; a metal terminal retained in the other end side of the axial hole; an electrical connection part arranged in the axial hole to establish electrical connection between the center electrode and the metal terminal; and a metal shell holding therein the insulator, wherein the electrical connection part includes a conductor consisting of a first crystal phase formed of a Fe-containing oxide and a second crystal phase formed of a conductive metal oxide of perovskite crystal structure. 2. The spark plug according to claim 1 , wherein the conductor satisfies a relationship of 0.05≤S 2 /(S 1 +S 2 )≤0.60 where S 1 is an area occupied by the first crystal phase in a cross section of the conductor; and S 2 is an area occupied by the second crystal phase in the cross section of the conductor. 3. The spark plug according to claim 1 , wherein the conductive metal oxide of perovskite crystal structure is represented by the chemical formula: ABO 3 having, as an A-site element thereof, at least one of La, Nd, Pr, Y and Yb. 4. The spark plug according to claim 1 , wherein the Fe-containing oxide has an average grain size of 3.0 μm to 25.0 μm. 5. The spark plug according to claim 1 , wherein the Fe-containing oxide contains two or more kinds of ferrites. 6. The spark plug according to claim 1 , wherein the electrical connection part further includes a resistor containing a conductive material and a glass material; and wherein a resistance between the metal terminal and the center electrode is in a range of 1 kΩ to 25 kΩ.
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Frequently asked questions
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- What does patent US10090646B2 cover?
- Disclosed is a spark plug capable of suppressing high-frequency noise by improving the material of an electrical connection part between a center electrode and a metal terminal within an axial hole of an insulator. A spark plug has an electrical connection part arranged in an axial hole of an insulator to establish electrical connection between a center electrode and a metal terminal. The elect…
- Who is the assignee on this patent?
- Ngk Spark Plug Co
- What technology area does this patent fall under?
- Primary CPC classification H01T13/05. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Oct 02 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).