Air compression internal combustion engine
In an air compression internal combustion engine having at least one cylinder, a combustion chamber formed in the cylinder and delimited at its longitudinal ends by a piston and a cylinder head which covers the cylinder, two intake valves and two exhaust valves per cylinder are installed in the cylinder head so as to be inclined at a valve angle α and β, respectively, in the range of 2° to 9° relative to a cylinder head longitudinal central plane ( 10 ), the valves each have a valve diameter D intake and D exhaust which is 30% to 40% of the cylinder diameter D cylinder , the valve heads are disposed at a distance from the cylinder wall which delimits the combustion chamber, and webs of a predefined width are provided between adjacent valves of a cylinder, and the valve heads have sections which protrude into the combustion by a predetermined limited amount.
1 . An air compression internal combustion engine having at least one cylinder arranged in an engine block with a combustion chamber formed in the cylinder and being delimited at its longitudinal ends by a piston and a cylinder head ( 1 ) which has a bottom area covering the cylinder, the cylinder head including for each cylinder four gas exchange valves (intake valves 8 , 9 and exhaust valves 11 , 12 ) which are installed in the cylinder head ( 1 ) so as to be inclined at a valve angle α and β, respectively, each in the range of 2° to 9° relative to a cylinder head longitudinal central plane ( 10 ), the gas exchange valves each having valve heads ( 8 a , 9 a , 11 a , 12 a ) with diameters D intake and D exhaust which have a diameter of 30% to 40% of the cylinder diameter D cylinder , and the valve heads ( 8 a , 9 a , 11 a , 12 a ) which are seated at the bottom of the cylinder head ( 1 ) also being disposed at a distance ( 30 , 31 ) from the cylinder wall which delimits the combustion chamber, a web ( 28 , 29 ) of a predefined width additionally being provided between adjacent gas exchange valves of a cylinder, and sections of the valve heads ( 8 a , 9 a , 11 a , 12 a ) of all the gas exchange valves having projection ( 26 , 27 ) protruding into the combustion chamber.
2 . The air compression internal combustion engine as claimed in claim 1 , wherein the gas exchange valves have diameters D intake and D exhaust in the range of 30% to 36% of the cylinder diameter D cylinder .
3 . The air compression internal combustion engine as claimed in claim 2 , wherein the intake valves ( 8 , 9 ) have diameters D intake of 34% to 36% of the cylinder diameter D cylinder and the exhaust valves ( 11 , 12 ) have diameters D exhaust of 30% to 32% of the cylinder diameter D cylinder .
4 . The air compression internal combustion engine as claimed in claim 1 , wherein the distance of the gas exchange valves ( 8 , 9 , 11 , 12 ) from the cylinder wall is 1.5 mm to 2.0 mm.
5 . The air compression internal combustion engine as claimed in claim 1 , wherein the web ( 28 ) between the intake valves ( 8 , 9 ) has a width of at least 5 mm.
6 . The air compression internal combustion engine as claimed in claim 1 , wherein the web ( 29 ) between the exhaust valves ( 11 , 12 ) has a width of at least 7 mm.
7 . The air compression internal combustion engine as claimed in claim 1 , wherein the projection ( 30 , 31 ) of the sections of the valve heads ( 8 a , 9 a , 11 a , 12 a ) which protrude into the combustion chamber when the valves are closed is 0.1 mm to 0.7 mm.