| 主权项 |
1. An engine in which:
a cylinder head includes combustion chamber roofs of adjacent cylinders, a branched intake port for introducing intake air into the adjacent cylinders, and intake valve ports provided at branched ends of the intake port, when viewed parallel to cylinder center axes, assuming a width direction of the cylinder head as a horizontal direction, a port inlet of the intake port is disposed just beside a partition wall for partitioning the combustion chamber roofs of the adjacent cylinders, port central axes of the intake port are disposed closer to the partition wall than a central virtual line of each cylinder, the central virtual line passing corresponding one of the cylinder center axes and extending horizontally, and the intake air is sucked through the intake valve ports along a wall between the cylinders, when viewed parallel to the cylinder center axes, the intake port is configured of a pair of curved ports protrudingly curving in a direction away from the partition wall from the port inlet to the combustion chamber roofs, and a pair of straight ports extending straight toward the centers of the combustion chamber roofs from terminal ends of the curved ports to the intake valve ports at the combustion chamber roofs, when viewed parallel to the cylinder center axes, tangential virtual lines extending from endpoints of curved port central axes along tangent lines of the endpoints pass the intake valve ports, and straight port central axes extending from the endpoints of the curved port central axes are further away from the partition wall than the tangential virtual lines, and the intake air bent through the curved ports passes the straight ports, and is sucked through the intake valve ports along the wall between the cylinders. |
