To increase output of an engine while reducing toxic substances in exhaust.
A cavity 11 formed on the top face of a piston 10 has a shallow pan shape with a maximum diameter D that is 3.5 or more times larger than a maximum depth H. A bottom surface 12 of the cavity 11 has a mountainous portion 13 in the center and canyon portion 14 at the periphery thereof. The mountainous portion 13 has a moderate slope surface making the bottom surface 12 a continuously smooth curved surface. A central range having a diameter D/4 in the cavity 11 has a volume of 3.5% or less of the entire cavity 11. A fuel injection valve 16 is attached to a cylinder head concentric with the cavity 11. An intersection point is made by an axis center of the fuel injection valve 16 and a side face 15 of the cavity 11. At a top dead center of the piston 10, a height h from the intersection point to the top face of the piston 10 is half or less of the maximum height H.
INAYOSHI MINAJI
TOUTO TAKAYUKI
NAKAKITA KIYOMI
INAGAKI KAZUHISA
SAKATA ICHIRO
KAWAGUCHI AKIO
OGAWA TAKASHI
FUJIWARA KIYOSHI
OKADA SUSUMU
TOYOTA MOTOR CORP
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