Double-action single-cylinder hot gas engine with inner and outer pistons has two compression cavities and two expansion cavities

摘要

The engine has a phase offset between its two pistons, one of which runs inside the other. It has two compression cavities and two expansion cavities. The compression cavity between the cylinder (3) and the outer piston (2) is connected to the expansion cavity between the outer piston and the inner piston (1). The expansion cavity between the cylinder and the outer piston is connected to the compression cavity between the outer piston and the inner piston.