Toyota Jidosha Kabushiki Kaisha

Souichi Matusita

Tatsuo Kobayashi

Toyokazu Baika

Shizuo Abe

Takashi Hashima

Nobuyuki Muramatsu

Hiroyuki Hokuto

Hiroya Tanaka

Fumiaki Hattori

Mutsumi Kanda

Toshimi Kashiwagura

Yasuhito Tsutsumi

Matsumi Kanda

Toshimi Kawashiwagura

Koukichi Fujimori

A direct cylinder injection-type spark ignition internal combustion engine is disclosed. The engine comprises a spark plug, a cavity formed in the top surface of a piston, and a fuel injection valve for injecting fuel into the cavity in nearly the shape of a fan having a relatively small thickness. When the fuel injected in nearly the shape of a fan from the fuel injection valve is considered by being divided into a plurality of fuel segments in a radial direction, a side wall of the cavity has a first fuel deflection passageand a second fuel deflection passagefor so deflecting at least two of the plurality of fuel segments as to pass near the spark plug. The side wall of the cavity is at least partly provided with a return portionthat protrudes toward the inside of the cavity. The first fuel deflection passage is not provided with the return portionor is provided with the return portion having a short protrusion, and the second fuel deflection passage is provided with the return portionhaving a long protrusion.

Direct cylinder injection-type spark ignition internal combustion engine

A direct cylinder injection-type spark ignition internal combustion engine is disclosed. The engine comprises a spark plug, a cavity formed in the top surface of a piston, and a fuel injection valve for injecting fuel into the cavity in nearly the shape of a fan having a relatively small thickness. When the fuel injected in nearly the shape of a fan from the fuel injection valve is considered by being divided into a plurality of fuel segments in a radial direction, a side wall of the cavity has a first fuel deflection passage and a second fuel deflection passage for so deflecting at least two of the plurality of fuel segments as to pass near the spark plug. The side wall of the cavity is at least partly provided with a return portion that protrudes toward the inside of the cavity. The first fuel deflection passage is not provided with the return portion or is provided with the return portion having a short protrusion, and the second fuel deflection passage is provided with the return portion having a long protrusion.

A direct-fuel-injection-type spark-ignition internal combustion engine is disclosed. The engine comprises a spark plug, a cavity formed on the top surface of the piston, and a fuel injection valve for injecting fuel into the cavity in nearly the shape of a fan having a relative small thickness. In the engine, the side wall of the cavity facing the fuel injection valve, for leading the fuel to the vicinity of the spark plug, has a horizontal sectional shape consisting of a part of an ellipse shape of which two foci are at a position of the injection hole of the fuel injection valve and a position near to the spark plug in plan view, and the side wall has a deflecting portion to deflect the fuel toward the inside of the cavity.

Direct-fuel-injection-type spark-ignition internal combustion engine

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Toyota, Japan

Souichi Matusita