| 摘要 |
PURPOSE:To form such an optimum air-fuel mixture as ignitable around a spark plug. CONSTITUTION:A spark plug is set up in the central part of a cylinder head inner wall surface, and a fuel injection valve 15 is set up in a peripheral edge of the cylinder head inner wall surface. A recess groove 15, being partitioned off by a pair of side wall surfaces 15b extending as gradually spreading toward the fuel injection valve 14 side from beneath the spark plug and a bottom wall surface 15c being almost flattened with the former is formed on a top face of a piston 2, and a fuel gride groove 16 is formed on the groove bottom wall surface 15c, Each recess groove wall surface 15b is almost straight installed toward the side of the fuel injection valve 14 from the recess groove end 15a. Fuel is sprayed aslant toward the groove bottom wall surface 15c from the fuel injection valve 14 and a part of injection fuel bumped with the bottom wall surface 16c is headed for the recess groove end 15a beneath the spark plug and the other injection fuel along the recess groove size wall surface 15b, respectively.
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