Internal combustion engine and manufacturing method therefor

Patent metadata

Field	Value
Publication number	US-2016177818-A1
Application number	US-201414910320-A
Country	US
Kind code	A1
Filing date	Jul 30, 2014
Priority date	Aug 5, 2013
Publication date	Jun 23, 2016
Grant date	—

Abstract

In an internal combustion engine in which an anodic oxide film ( 10 ) is formed on part or all of a wall surface facing a combustion chamber, the anodic oxide film ( 10 ) has a thickness of 30 μm to 170 μm, the anodic oxide film ( 10 ) has first micropores ( 1 a ) having a micro-size diameter, nanopores having a nano-size diameter and second micropores ( 1 b ) having a micro-size diameter, the first micropores ( 1 a ) and the nanopores extending from a surface of the anodic oxide film ( 10 ) toward an inside of the anodic oxide film ( 10 ) in a thickness direction of the anodic oxide film ( 10 ) or substantially the thickness direction, the second micropores ( 1 b ) being provided inside the anodic oxide film ( 10 ), at least part of the first micropores ( 1 a ) and the nanopores are sealed with a seal ( 2 ) converted from a sealant ( 2 ), and at least part of the second micropores ( 1 b ) are not sealed.

First claim

1 . An internal combustion engine comprising:
an anodic oxide film forming on part or all of an aluminum-based wall surface facing a combustion chamber, wherein an aluminum-based material that forms the aluminum-based wall surface contains Si and Cu as an alloy component, a content of Si in the aluminum-based material is higher than or equal to 5% and less than 20% and a content of Cu in the aluminum-based material is higher than or equal to 0.4% and less than 7%, the anodic oxide film has a thickness of 30 μm to 170 μm; the anodic oxide film has first micropores having a micro-size diameter, nanopores having a nano-size diameter and second micropores having a micro-size diameter, the first micropores and second micropores have a sectional diameter or maximum size of a range of 1 to 100 μm and the nanopores have a sectional diameter or maximum size of a range of 10 to 100 nm, the first micropores and the nanopores extending from a surface of the anodic oxide film toward an inside of the anodic oxide film in a thickness direction of the anodic oxide film or substantially the thickness direction, the second micropores being provided inside the anodic oxide film; at least part of the first micropores and the nanopores are sealed with a seal that is converted from a sealant, at least part of the second micropores are not sealed; and the anodic oxide film sealed with the seal has a porosity of 20 to 70%.

2 . (canceled)

3 . The internal combustion engine according to claim 1 , wherein
the seal is made of a substance that includes silica as a main component.

4 . The internal combustion engine according to claim 1 , wherein
the sealant is made of any one of polysiloxane, polysilazane and sodium silicate.

5 . The internal combustion engine according to claim 1 , wherein
the aluminum-based material that forms the aluminum-based wall surface further contains at least one of Mg, Ni, and Fe as the alloy component.

6 . A manufacturing method for an internal combustion engine, comprising:
a first step of forming an anodic oxide film on part or all of an aluminum-based wall surface facing a combustion chamber, the anodic oxide film having first micropores having a micro-size diameter, nanopores having a nano-size diameter and second micropores having a micro-size diameter, the first micropores and second micropores having a sectional diameter or maximum size of a range of 1 to 100 μm and the nanopores having a sectional diameter or maximum size of a range of 10 to 100 nm, the first micropores and the nanopores extending from a surface of the anodic oxide film toward an inside of the anodic oxide film in a thickness direction of the anodic oxide film or substantially the thickness direction, the second micropores being provided inside the anodic oxide film, the anodic oxide film having a thickness of 30 μm to 170 μm; and a second step of forming the anodic oxide film subjected to sealing in which a sealant is applied to the surface of the anodic oxide film, the sealant penetrates into at least part of the first micropores and the nanopores, the sealant is converted into a seal, at least part of the first micropores and the nanopores are sealed with the seal and at least part of the second micropores are not sealed wherein an aluminum-based material that forms the aluminum-based wall surface contains Si and Cu as an alloy component, a content of Si in the aluminum-based material is higher than or equal to 5% and less than 20% and a content of Cu in the aluminum-based material is higher than or equal to 0.4% and less than 7%; and the anodic oxide film sealed with the seal has a porosity of 20 to 70%.

7 . (canceled)

8 . The manufacturing method according to claim 6 , wherein
the seal is made of a substance that includes silica as a main component.

9 . The manufacturing method according to claim 6 , wherein
the sealant is made of any one of polysiloxane, polysilazane and sodium silicate.

10 . The manufacturing method according to claim 6 , wherein
the aluminum-based material that forms the aluminum-based wall surface further contains at least one of Mg, Ni, and Fe as the alloy component.

Assignees

• Toyota Motor Co Ltd

Inventors

• Nishikawa Naoki
• Makino Hiroshi
• Takagishi Reona
• Kawaguchi Akio
• Wakisaka Yoshifumi
• Shimizu Fumio
• Horie Toshio

Classifications

• C25D11/18

  After-treatment, e.g. pore-sealing · CPC title

• F02F1/24

  Cylinder heads · CPC title

• F02B77/11 Primary

  Thermal or acoustic insulation · CPC title

• C25D11/246

  for sealing layers · CPC title

• C25D11/04

  of aluminium or alloys based thereon · CPC title