Spark plug
US-2024275138-A1 · Aug 15, 2024 · US
Spark plug
US2022077661A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2022077661-A1 |
| Application number | US-202017413239-A |
| Country | US |
| Kind code | A1 |
| Filing date | Apr 27, 2020 |
| Priority date | Nov 29, 2019 |
| Publication date | Mar 10, 2022 |
| Grant date | — |
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- Title
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- Abstract
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- Assignees and inventors
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- Key dates
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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.
The spark plug includes a cylindrical insulator, a center electrode provided in the insulator, and a cylindrical metal shell provided around the insulator. A ledge portion of the metal shell has a frontward facing surface facing a front side, a rearward facing surface facing a rear side, and a connection surface connecting the rearward facing surface and the frontward facing surface. The rearward facing surface engages with a step portion of the insulator. The metal shell includes a front cylindrical portion connected to the front side of the ledge portion. The inner circumferential surface of the front cylindrical portion is connected to the frontward facing surface of the ledge portion via a chamfered surface or a rounded surface. A corner at which the connection surface and the frontward facing surface are connected is located on the front side with respect to a front end of the insulator.
First claim
Opening claim text (preview).
1 . A spark plug comprising: a cylindrical insulator in which an axial hole extending along an axial line is formed, the cylindrical insulator having, on an outer circumference thereof, a step portion protruding radially outward; a center electrode provided in the axial hole and having a front end protruding from the axial hole; and a cylindrical metal shell provided around the outer circumference of the insulator, the cylindrical metal shell having, on an inner circumference thereof, a ledge portion protruding radially inward, the ledge portion having a frontward facing surface facing a front side, a rearward facing surface facing a rear side, and a connection surface connecting the rearward facing surface and the frontward facing surface, the rearward facing surface engaging with the step portion, wherein the metal shell has a front cylindrical portion which is connected to the front side of the ledge portion and inside which the end of the center electrode is located, the front cylindrical portion has an inner circumferential surface connected to the frontward facing surface of the ledge portion, the inner circumferential surface and the frontward facing surface are connected via a chamfered surface or a rounded surface, and a corner at which the connection surface and the frontward facing surface are connected is located on the front side with respect to a front end of the insulator. 2 . The spark plug according to claim 1 , wherein the front cylindrical portion has an expanding portion having an inner diameter that increases toward the rear side. 3 . The spark plug according to claim 1 , further comprising a cap portion which covers the front cylindrical portion from the front side and in which a through hole is formed.
Assignees
Inventors
Classifications
characterised by features of the earthed electrode · CPC title
- H01T13/20Primary
characterised by features of the electrodes or insulation · CPC title
of sparking plugs · CPC title
- H01T13/54Primary
having electrodes arranged in a partly-enclosed ignition chamber · CPC title
Covers forming a part of the plug and protecting it against adverse environment · CPC title
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Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US2022077661A1 cover?
- The spark plug includes a cylindrical insulator, a center electrode provided in the insulator, and a cylindrical metal shell provided around the insulator. A ledge portion of the metal shell has a frontward facing surface facing a front side, a rearward facing surface facing a rear side, and a connection surface connecting the rearward facing surface and the frontward facing surface. The rearwa…
- Who is the assignee on this patent?
- Ngk Spark Plug Co
- What technology area does this patent fall under?
- Primary CPC classification H01T13/20. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Thu Mar 10 2022 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).