| 摘要 |
<p>In a side view of a cylinder (2) where an axis (3) of a cylinder bore (4) of an internal combustion engine (1) is aligned with the vertical line, an intake passage (15) is formed on one side of a cylinder head (6) and an exhaust passage (19) is formed on the other side. A fuel injection valve (45) is provided such that the valve is capable of injecting fuel (44) diagonally downward toward the inside of the cylinder bore (4) from an outer end of the one side of the cylinder head (6). A spark plug (47) having a discharge portion (46) that is in the cylinder bore (4) substantially along the axis (3) of the cylinder bore (4) is provided. When the cylinder (2) is viewed from above, the fuel (44) injected by the fuel injection valve (45) forms a shape of an inverted letter V with the discharge portion (46) positioned between both lines of the letter, and the fuel (44) is injected by the injection valve (45) in an intake stroke. According to the above structure, in a light load condition, etc. of the internal combustion engine (1), fuel consumption can be improved more reliably even when the air-fuel mixture in the cylinder bore (4) has a large total average air-fuel ratio and the air-fuel mixture is lean in average.</p> |
