Patent ID: 8210136

Claim:
A two-stroke internal combustion engine with opposed cylinders which utilizes an integrated positive displacement supercharger and regenerator comprising: at least one cylinder housing assembly forming two opposed cylinders sharing a common axis, each cylinder having an outward facing end, an inward facing end facing the other cylinder and, between the ends, a fixed annular partition extending radially inward in the cylinder and having a supercharger side and a regenerator side; two double piston assemblies encircled by the cylinder housing assembly, wherein each double piston assembly includes a hollow cylindrical body having an outer end and an inner end and defining a combustion chamber; an annular supercharger piston affixed at the outer end of the hollow cylindrical body, wherein said hollow body has circumferential perforations adjacent the supercharger piston; and a regenerator piston affixed at the inner end of the hollow cylindrical body, wherein the regenerator piston has at least one integrated exhaust valve suitable for fluid flow in the inward direction; and the inner end of the hollow cylindrical body is controllably sealed with an integrated transfer valve enabling fluid flow out of the combustion chamber in the inward direction with respect to the cylinder housing assembly; in each cylinder, a supercharger chamber; in each cylinder, a regenerator chamber separate from the supercharger chamber; an inlet valve assembly at the outward facing end of each cylinder, and a crankpin mounted on the cylinder housing assembly between the opposed cylinders, the crankpin having integrated cam lobes to actuate the at least one exhaust valve and being orientated such that the axis of the crankpin is perpendicular to the common axis of the cylinder housing assembly wherein the fluid flow out of the combustion chamber flows into the regenerator chamber, but fluid does not flow from the regenerator chamber into the combustion chamber.