Dual spark-ignition internal combustion engine
AssigneeNissan Motor Co., Ltd.
InventorsShin-ichi Nagumo, Yoshimasa Hayashi, Kizuku Otsubo
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Abstract
Each combustion chamber of an internal combustion engine is divided into four generally equal imaginary parts by a longitudinal vertical imaginary plane parallel with the longitudinal axis of the cylinder head of the engine and a lateral vertical imaginary plane perpendicular to the longitudinal vertical imaginary plane. Two spark plugs, and intake and exhaust valves are disposed on the cylinder head wall surface defining the upper part of the combustion chamber, and located at the four generally equal imaginary parts, respectively.
Claims17
An internal combustion engine having a cylinder formed in a cylinder block thereof, comprising:
- a combustion chamber defined by the crown of a piston reciprocally movably disposed in the cylinder and a cylinder head secured to the cylinder block to close one end of the cylinder, said combustion chamber being divided into first, second, third, and fourth imaginary parts by a vertical longitudinal plane parallel to the longitudinal axis of the cylinder head and passing through the center axis of the cylinder, and a lateral vertical plane perpendicular to the vertical longitudinal plane and passing through the center axis of the cylinder;
- two spark plugs disposed so that the midpoints of central and side electrodes thereof are respectively located at the first and second imaginary parts of said combustion chamber;
- intake and exhaust valve heads disposed so that the centers thereof are respectively located at the third and fourth imaginary parts of said combustion chamber;
- means for supplying a portion of the exhaust gases of the engine into said combustion chamber.
Dependencies are inferred from the claim text.