Spark plug
US-2020112146-A1 · Apr 9, 2020 · US
Spark plug insulator and spark plug
US12249809B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12249809-B2 |
| Application number | US-202418616670-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 26, 2024 |
| Priority date | Mar 29, 2023 |
| Publication date | Mar 11, 2025 |
| Grant date | Mar 11, 2025 |
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- Title
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Abstract
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When a force to bend a spark plug insulator is applied to the spark plug insulator to fracture the spark plug insulator, for a range including a starting point of the fracture out of two ranges into which a fracture surface created by the fracture is divided by a plane which is a plane perpendicular to a direction of the force and includes the axial line, an average of areas of particles appearing in a planar image of the range is 4.4 μm 2 or larger and 8.0 μm 2 or smaller, and a maximum area of the particles is 600 μm 2 or smaller. The particles include large particles having an area of 60 μm 2 or larger and 600 μm 2 or smaller, and, as the large particles, 0.1 particles/mm 2 or more are present per unit area of the planar image.
First claim
Opening claim text (preview).
What is claimed is: 1. A spark plug insulator composed of an alumina-based sintered body provided with an axial hole extending along an axial line, wherein when a force to bend the spark plug insulator is applied to the spark plug insulator to fracture the spark plug insulator, for a range including a starting point of the fracture out of two ranges into which a fracture surface created by the fracture is divided by a plane which is a plane perpendicular to a direction of the force and includes the axial line, an average of areas of particles appearing in a planar image of the range is 4.4 μm 2 or larger and 8.0 μm 2 or smaller, and a maximum area of the particles is 600 μm 2 or smaller, the particles include large particles having an area of 60 μm 2 or larger and 600 μm 2 or smaller, and as the large particles, 0.1 particles/mm 2 or more are present per unit area of the planar image. 2. The spark plug insulator according to claim 1 , wherein, as the large particles, 6.2 particles/mm 2 or less are present per unit area of the planar image. 3. The spark plug insulator according to claim 1 , wherein the particles include small particles having an area of 20 μm 2 or larger and 59 μm 2 or smaller, and as the small particles, 613 particles/mm 2 or more and 2270 particles/mm 2 or less are present per unit area of the planar image. 4. A spark plug including the spark plug insulator according to claim 1 .
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- What does patent US12249809B2 cover?
- When a force to bend a spark plug insulator is applied to the spark plug insulator to fracture the spark plug insulator, for a range including a starting point of the fracture out of two ranges into which a fracture surface created by the fracture is divided by a plane which is a plane perpendicular to a direction of the force and includes the axial line, an average of areas of particles appear…
- Who is the assignee on this patent?
- Niterra Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01T13/38. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Mar 11 2025 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 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).