Air compressing internal combustion engine with direct injection

Claim 1

An air compressing direct injection internal combustion engine having a reciprocatory piston forming a first element and having a pertaining cylinder head forming a second element, one of said elements being provided with a ball-shaped combustion chamber which has a neck that is constricted with regard to the diameter of said combustion chamber and which is adapted to receive the combustion air as to circulate the same in said combustion chamber, the ratio of the diameter of said combustion chamber to the diameter of said neck not exceeding 1.15, said engine also having a fuel injection nozzle associated with said combustion chamber and so directed toward the inside of said combustion chamber that the fuel jet injected by said fuel injection nozzle passes through a plane which is parallel to said neck and is spaced from the opposite end of said chamber onefourth of the distance from said end to said neck and to a point of impact upon the inside surface of said combustion chamber between said plane and said end to form a thin film of fuel on the wall of said chamber which is removed in vapor form through circulating combustion air, the ratio of the circumferential velocity of the air charge in said combustion chamber to the axial apeed of said air charge being not in excess of 4, said circumferential velocity with reference to said measuring diameter (0.7 cylinder diameter) and to maximum valve stroke substantially equalling the mean velocity of said piston.