Internal combustion engine

Abstract

This direct injection-type internal combustion engine includes, in a combustion chamber, a spark plug and a fuel injection nozzle. The fuel injection nozzle injects fuel toward the spark plug. Provided to a top surface are a pair of side guides that extend along the intake-exhaust direction connecting an intake port and an exhaust port, and are respectively disposed on two end sides in the crankshaft direction orthogonal to the intake-exhaust direction. A communication passage communicating in a direction intersecting said extension direction is formed in the side guides, which are provided as projecting toward the cylinder head.

Claims

1. A cylinder formed by a cylinder block, A cylinder head covering one end of the cylinder, A piston having a top surface facing the cylinder head and reciprocating within the cylinder, In the combustion chamber formed between the cylinder, the cylinder head, and the piston, a spark plug is positioned in the center of the cylinder head. The intake port and exhaust port are provided in the cylinder head, flanking the spark plug, A fuel injection nozzle that supplies fuel to the combustion chamber, An internal combustion engine equipped with, The top surface of the piston is provided with a pair of lateral guide portions that extend along the intake and exhaust direction connecting the intake port and the exhaust port, protrude toward the cylinder head, and are positioned at both ends in the cylinder axis direction, which is the reciprocating direction of the cylinder, and the crank axis direction, which is perpendicular to the intake and exhaust direction. A passage is formed in the lateral guide portion that extends in a direction intersecting the extending direction and connects the inner surface and the outer surface of the lateral guide portion. A sub-chamber for housing the spark plug is provided within the combustion chamber. The aforementioned sub-chamber has an injection port that connects the combustion chamber and the sub-chamber, and injects flames from the sub-chamber into the combustion chamber. The passage portion is formed on the extension line of the injection nozzle when viewed in the axial direction of the cylinder, Internal combustion engine.

2. The depth of the passage portion in the cylinder axial direction is increased from the outer side of the passage portion in the extending direction, which is the center side of the piston, to the inner side of the passage portion in the extending direction, which is the edge side of the top surface. The internal combustion engine according to claim 1.

3. The width of the passage portion perpendicular to the extending direction and the cylinder axis direction is made wider from the inner side of the passage portion in the extending direction, which is the center side of the top surface, to the outer side of the passage portion in the extending direction, which is the edge side of the top surface. The internal combustion engine according to claim 1.

4. The passage portion is made into a groove portion in which the lateral guide portion is recessed, On the top surface of the piston, an inclined surface is formed between the pair of lateral guide portions, extending along the intake and exhaust direction and sloping toward the cylinder head side as it approaches the intake port. The passage portion is provided in a position that is not adjacent to the top of the inclined surface when viewed in the axial direction of the cylinder, The internal combustion engine according to claim 1.

5. The passage portion is made into a groove portion in which the lateral guide portion is recessed, The width of the lateral guide portion, which is the width in the direction perpendicular to the extending direction of the lateral guide portion, is made wider on the exhaust side of the passage portion than on the intake side of the passage portion. An internal combustion engine according to any one of claims 1 to 4.

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