Spark plug
US-2015380907-A1 · Dec 31, 2015 · US
Spark plug
US2025392105A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2025392105-A1 |
| Application number | US-202218727445-A |
| Country | US |
| Kind code | A1 |
| Filing date | Nov 28, 2022 |
| Priority date | Jan 11, 2022 |
| Publication date | Dec 25, 2025 |
| Grant date | — |
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- Title
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- Abstract
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- Assignees and inventors
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- First independent claim
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- CPC / IPC classifications
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- Citations and related patents
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Abstract
Official abstract text for this publication.
A spark plug includes: an insulator having an axial hole along an axial line; a center electrode provided on a front end side in the axial hole; a metal terminal provided on a rear end side in the axial hole; and a connection portion electrically connecting the center electrode and the metal terminal in the axial hole. The metal terminal has a head portion located at a rear end of the insulator, and a shaft portion located in the axial hole adjacently to a front end of the head portion. The shaft portion is thinner than the head portion, and at least a front end of the shaft portion contacts with the connection portion. The metal terminal contains 97 wt % or more of Fe and 0.20 to 0.28 wt % of C. A length along the axial line of the shaft portion is not greater than 60 mm.
First claim
Opening claim text (preview).
1 . A spark plug comprising: an insulator having an axial hole penetrating from a front end to a rear end along an axial line; a center electrode provided on a front end side in the axial hole; a metal terminal, comprising: a head portion located at the rear end of the insulator; and a shaft portion located in the axial hole adjacently to a front end of the head portion, the shaft portion being thinner than the head portion; and a connection portion in contact with at least a front end of the shaft portion, the connection portion electrically connecting the center electrode and the metal terminal in the axial hole, wherein the metal terminal contains 97 wt % or more of Fe and 0.20 to 0.28 wt % of C, and wherein a length along the axial line of the shaft portion is not greater than 60 mm. 2 . The spark plug according to claim 1 , wherein the length is not smaller than 20 mm. 3 . The spark plug according to claim 1 , wherein the metal terminal contains 0.22 wt % or less of Cr.
Assignees
Inventors
Classifications
characterised by the mounting of electrodes in insulation, e.g. by embedding · CPC title
Means providing electrical connection to sparking plugs · CPC title
- H01T13/39Primary
Selection of materials for electrodes · CPC title
with interference suppressing or shielding means · CPC title
of sparking plugs · CPC title
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Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US2025392105A1 cover?
- A spark plug includes: an insulator having an axial hole along an axial line; a center electrode provided on a front end side in the axial hole; a metal terminal provided on a rear end side in the axial hole; and a connection portion electrically connecting the center electrode and the metal terminal in the axial hole. The metal terminal has a head portion located at a rear end of the insulator…
- Who is the assignee on this patent?
- Niterra Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01T13/39. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Thu Dec 25 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).