Combustion chamber of a reciprocating internal combustion engine which promotes a rotary combustion turbulence

Claim 1

Reciprocating combustion engine comprising at least one piston, one cylinder and a cylinder head delimiting a combustion chamber, the head of said piston comprising a projecting part, said engine further comprising an exhaust valve and injector means for admitting a fuel mixture to said combustion chamber, and wherein said engine operates so that at least the end of the admission of the fuel mixture is concurrent with the onset of the combustion, characterized in that said projecting part and the cylinder head are shaped in such a manner that two first portions of the piston surface are spaced from the internal surface of the cylinder head and are separated from one another by said projecting part, and that a third portion of the piston surface has a first part which is next to the internal surface of the cylinder head when the piston is at the upper dead center point, said third portion of the surface comprising a second part which is at a distance from the internal surface of the cylinder head to form a connecting zone for said two first portions, these latter determining together with the cylinder head, respectively, an initial combustion zone and an expansion zone for the gases originating from the combustion, while said connecting zone together with the cylinder head forms an orifice having a longitudinal direction for passage of said gases from the initial combustion zone to the expansion zone along said longitudinal direction of said orifice and for guiding said gases along the cylinder head, wherein said expansion zone has a wall formed to have, in a plane extending along the longitudinal direction of said orifice, an outline which is curved in the direction toward said orifice, said wall is located in the path of gases flowing out of said orifice, and said wall and said orifice constitute means for imparting a rotary turbulence to gases in the expansion zone, and further characterized in that the part of the initial combustion zone which is next to said connecting zone is located in proximity to the exhaust valve and that said injector means is oriented to direct the fuel mixture in the direction of the exhaust valve.