| 摘要 |
PROBLEM TO BE SOLVED: To further enhance a reduction effect of knocking without making the structure of an engine complex.SOLUTION: A center o2 of an intake valve 6 in a plurality of intake ports 5 is eccentric toward an exhaust port 7 from a center o1 of an inner face of a seat ring 20, and is eccentric toward a side of a shaft center x of a cylinder bore across intake/exhaust parallel lines E1, E2 parallel to an intake/exhaust center line A passing through the center o1 of the inner face of the seat ring 20 and connecting between an intake side center D and exhaust side center C of a cylindrical bore inner face 3a constituting a combustion chamber 3. A throat portion 22 of a seat ring 20 constitutes an eccentric suction port in which an eccentric side of the center o2 of the intake valve 6 is formed relatively deeper than other sides along an eccentric direction lines F1, F2 connecting between the center o2 of the intake valve 6 and the center o1 of the inner face of the seat ring 20. Furthermore, injection center lines G1, G2 of fuel injection performed by a port injection valve 9 arranged inside the eccentric suction port is constructed to be directed to a shaft center x side of a cylinder bore rather than the center o1 of the inner face 24 of the seat ring 20.SELECTED DRAWING: Figure 1 |
