Piston for internal combustion engine, internal combustion engine including this piston, and manufacturing method of this piston
US-2016273483-A1 · Sep 22, 2016 · US
Piston for internal combustion engine
US9932928B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9932928-B2 |
| Application number | US-201515129512-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 8, 2015 |
| Priority date | May 23, 2014 |
| Publication date | Apr 3, 2018 |
| Grant date | Apr 3, 2018 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
On a piston top surface, a cavity and two valve recesses are formed. On the piston top surface, a first heat insulating film is formed. However, on edge portions, a second heat insulating film different from the first heat insulating film is formed. The second heat insulating film is formed along the edge portions. The first heat insulating film is composed of porous alumina and a sealer. The second heat insulating film is composed of only porous alumina.
First claim
Opening claim text (preview).
The invention claimed is: 1. A piston for an internal combustion engine comprising a piston main body, a cavity formed on a top surface of the piston main body, and a heat insulating film that is formed on the top surface, and has a lower thermal conductivity and a lower heat capacity per unit volume than an aluminum alloy that is used as a base material of the piston main body, wherein the heat insulating film comprises a low heat insulation film that is formed on a cavity edge portion forming a boundary between the cavity and the top surface and is composed of alumina having a number of pores that are opened to the top surface, and a high heat insulation film that is formed on a surface inward from the cavity edge portion and a surface surrounding the cavity edge portion, and is composed of alumina having a number of pores that are opened to the top surface and a sealer that is provided to cover the openings of the number of pores. 2. The piston for an internal combustion engine according to claim 1 , wherein the low heat insulation film is formed on a piston edge portion forming an edge of the top surface, and between the piston edge portion and the cavity edge portion, a surface surrounding the cavity edge portion is formed. 3. The piston for an internal combustion engine according to claim 1 , wherein an edge angle θ of the cavity edge portion satisfies 0°<θ≤90°. 4. The piston for an internal combustion engine according to claim 1 , further comprising: a valve recess that is formed in the surface surrounding the cavity edge portion, wherein the low heat insulation film is formed on a valve recess edge portion corresponding to a circular arc portion in a boundary between the surface surrounding the cavity edge portion and the valve recess, and the high heat insulation film is formed on a surface inward from the valve recess edge portion. 5. The piston for an internal combustion engine according to claim 4 , wherein an edge angle θ of the valve recess edge portion satisfies 0°<θ≤90°.
Assignees
Inventors
Classifications
the combustion space having substantially the shape of a cylinder · CPC title
the material being a porous medium, e.g. sintered metal · CPC title
- F02F3/12Primary
on piston heads · CPC title
characterised by its eccentricity from the cylinder axis · CPC title
Improving ICE efficiencies · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US9932928B2 cover?
- On a piston top surface, a cavity and two valve recesses are formed. On the piston top surface, a first heat insulating film is formed. However, on edge portions, a second heat insulating film different from the first heat insulating film is formed. The second heat insulating film is formed along the edge portions. The first heat insulating film is composed of porous alumina and a sealer. The s…
- Who is the assignee on this patent?
- Toyota Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification F02F3/12. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Apr 03 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).