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AssigneeToyota Jidosha Kabushiki Kaisha
InventorsShizuo Abe, Fumikazu Satou, Kouichi Sasaki, Sigemitu Iisaka
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A direct fuel injection-type spark-ignition internal combustion engine is disclosed. The engine comprises a cavity formed on the top surface of the piston, a spark plug facing the inside of said cavity, and a fuel injection valve for injecting fuel into the cavity in nearly the shape of a fan having a relative small thickness. The cavity has a bottom wall onto which the injected fuel impinges initially and a side wall facing to the fuel injection valve. The side wall has a deflection portion which is nearly the shape of a linear line and a circular arc portion which connects the deflection portion and the bottom wall smoothly in a vertical section. An angle of the deflection portion with the bottom wall is in a range from 50 to 80 degrees. A radius of the circular arc portion is in a range from 5 to 15 mm.
A direct fuel injection-type spark-ignition internal combustion engine comprising a cavity formed on the top surface of a piston, a spark plug facing the inside of said cavity, and a fuel injection valve for injecting fuel into said cavity in nearly the shape of a fan having a relative small thickness, wherein said cavity having a bottom wall onto which the injected fuel impinges initially and a side wall facing said fuel injection valve, said side wall having a deflection portion which is nearly the shape of a linear line and a circular arc portion which connects said deflection portion and said bottom wall smoothly in a vertical section, an angle of said deflection portion with said bottom wall being in a range from 50 to 80 degrees, a radius of said circular arc portion being in a range from 5 to 15 mm.
Dependencies are inferred from the claim text.