Honda Motor Co., Ltd.

Hisao Uozumi

Mitsuru Sugimoto

Satoshi Yamamura

Noriyuki Takegata

Makoto Yamazaki

In an internal combustion engine provided with a combustion chamber defined by an inner circumferential surface of a cylinder, an end surface of a cylinder head facing the cylinder, a crown surface of a piston, an inner surface of an intake valve, and an inner surface of an exhaust valve, for the purpose of improving the anti-knocking performance of the engine, the inner circumferential surface of the cylinder, the end surface of the cylinder head, the crown surface of the piston, the inner surface of the intake valve and the inner surface of the exhaust valve include a mirror surface region formed as a mirror surface having an arithmetic average roughness of 0.3 &#x3bc;m or less, and a rough surface region formed as a rough surface having an arithmetic average roughness of 0.3 &#x3bc;m or more.

Internal combustion engine with reduced engine knocking

An internal combustion engine includes an anisotropic thermal conductivity member () provided on a wall surface defining a cylinder or a wall surface of a cooling water passage on a side of the cylinder, a thermal conductivity of the anisotropic thermal conductivity member in an axial direction of the cylinder being higher than a thermal conductivity of the anisotropic thermal conductivity member in a radial direction of the cylinder, and a thermally insulating member () provided on an outer surface of the anisotropic thermal conductivity member with respect to the radial direction of the cylinder.

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Wako, Japan

Hisao Uozumi