| 摘要 |
PURPOSE:To supply sufficient fuel stably into the vicinity of a spark plug so as to attain lean combustion and exhaust emission purification by pointing the centerline of a fuel injection valve, provided in a communicating chamber where each intake passage meets, into the vicinity of a center intake valve and more onto the center face side than the center of the head part side end face of the center intake valve. CONSTITUTION:Three intake valves 20a-20c are disposed on one side of the center face beta including the cylinder centerline alpha and parallel to camshafts 22, 24, and two exhaust valves 18 are disposed on the other side of the center face beta. These intake and exhaust valves are also disposed in such a way as to surround a spark plug 34 facing around the center of a combustion chamber 16. In this case, a communicating chamber 46 where intake passages 40a, 40b communicated with the respective intake valves 20a-20c meet is disposed at the side part of a cylinder head 12. A fuel injection valve 48 for injecting fuel is disposed in the communicating chamber 46, and the centerline (z) of the fuel injection valve 48 points to a part in the vicinity of the center intake valve 20b from the cylinder centerline direction view and to more onto the center face beta side than the center (y) of the head part side end face in the center intake valve 20b from the camshaft direction view. |
