Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Toyota Chuo Kenkyusho

Hidemasa Kosaka

Yoshifumi Wakisaka

Fumio Shimizu

Akio Kawaguchi

Naoki Nishikawa

Takumi Hijii

Koichi Nakata

Makoto Koike

Yoshihiro Nomura

Yoshihiro Hotta

Kiyomi Nakakita

Ryouta Yatsuduka

Shinya Iida

In a spark ignition engine, a thermal insulation thin layer is formed over a wall surface, facing an inside of a combustion chamber, of a base material forming the combustion chamber, and for a thermal conductivity &#x3bb; [W/(m&#xb7;K)], a thermal diffusivity &#x3ba; [mm/s], and a thickness L [&#x3bc;m] of the thermal insulation thin layer, L&#x2267;16.7&#xd7;&#x3bb; and L&#x2266;207.4&#xd7;(&#x3ba;)are satisfied. With such a configuration, a heat loss Q_total escaping from gas in a cylinder to the wall of the combustion chamber over all strokes can be reduced, and the thermal efficiency can be improved without inducing degradation of knocking due to an increase in an amount of heating Q_intake of the gas in the cylinder during an intake stroke.

Spark ignition type internal combustion engine

An internal combustion engine having an anodic oxidation coating formed on at least a part of a wall surface that faces a combustion chamber, wherein the anodic oxidation coating has voids and nano-holes smaller than the voids; at least part of the voids are sealed with a sealant derived by converting a sealing agent; and at least a part of the nano-holes are not sealed.

Internal combustion engine and method for manufacturing the same

An internal combustion engine in which an anodic oxidation coating film is formed on all or a portion of a wall that faces a combustion chamber, wherein the anodic oxidation coating film has a structure that is provided with a bonding region in which each of hollow cells forming the coating film is bonded to the adjacent hollow cells, and a nonbonding region in which three or more adjacent hollow cells are not bonded to each other, and wherein a porosity of the anodic oxidation coating film is determined by a first void present in the hollow cell and a second void that forms the nonbonding region.

Internal combustion engine and method of producing same

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Nisshin, Japan

Hidemasa Kosaka