US Patent 7237542 Internal combustion engine

The invention concerns a combustion engine comprising a cylinder and a piston which is displaceably guided in the cylinder, the piston having a piston head facing a combustion chamber and being coupled to a crankshaft via a connecting rod, wherein a second piston which is displaceably guided in the cylinder is provided opposite to the piston, the second piston also having a piston head, wherein the combustion chamber is disposed between the two piston heads, and the second piston is coupled to a crankshaft via a connecting rod.