Patent ID: 7677221

Claim:
An internal-combustion engine, notably of direct injection type, comprising at least a cylinder, a piston sliding in this cylinder, a combustion chamber delimited on one side by the upper face of said piston comprising a concave bowl within which a teat of vertex angle (a 2 ) is arranged and a fuel injection nozzle for injecting fuel with a jet nappe angle (a 1 ) less than or equal to 2 ⁢ Arctg ⁢ CD 2 ⁢ F , where CD is the diameter of cylinder and F the distance between the point of origin of the fuel jets from the injection nozzle and the position of piston corresponding to a crank angle of 50° to the top dead centre (TDC), characterized in that vertex angle (a 2 ) of teat is greater than jet nappe angle (a 1 ) by an angle greater than 30° and less than 60°.