Constant-volume combustion engine

A constant-volume combustion engine, in particular a reciprocating piston engine for generating mechanical energy by way of expansion of a gas or a hot gas from the combustion of a gas mixture or gas/fuel mixture, having at least one piston/cylinder unit, the piston of which is connected to a piston rod, the piston rod being drive-connected to a first and a second crankshafts, wherein the first crankshaft is mounted eccentrically rotatably on the second crankshaft which is arranged parallel to it, and is rotationally coupled to said second crankshaft;

• wherein the first and the second crankshafts perform a sinusoidal rotational movement, and the piston rod, or at least an additional connecting part, is mounted rotatably with a first eccentricity (d1) on the first crankshaft,
• wherein the first crankshaft is mounted with a second eccentricity (d2) on the second crankshaft, the second eccentricity (d2) being between three and five times as great as the first eccentricity (d1), the crankshafts being arranged relative to one another in such a way that the amplitude of the sinusoidal curve of the rotational movement of the second crankshaft is between three and five times as great as the amplitude of the sinusoidal curve of the rotational movement of the first crankshaft.