Abstract: The publication relates to a power converter according to the principle of the hot-air engine (Stirling engine), comprising a cylinder containing a main piston (4) and a displacement piston (3), each of which can be moved forward and backward on the axis of the cylinder and each of which possesses a piston rod assembly (20, 25) which is connected via connecting rods (17, 21) with a link system (21-24 or 17-19 resp.) to two parallel cranks (9) which rotate synchronously in opposite directions so that the displacement piston is moved phase-shifted to the main piston. The link system (21-24) of the main piston (4) comprises a frame element (24) which is rigidly connected to the latter's piston rod assembly (25) and has at least four journals (22,23) which are arranged symmetrically to the cylinder axis in a common plane perpendicular to the cylinder axis and which are oriented parallel to the crank shafts (9) and to each of which is linked a connecting rod (21).

Abstract: A motion transmitting mechanism for heat engines, refrigerating machines and heat pumps which are hermetically sealed or provided with rotary shaft seals and have reciprocating pistons connected to the motion transmitting mechanism (11) by means of connecting rods (33, 34, 23, 24), is provided with two counterrotating crank systems which are centered along a single center line, whereby the lateral forces of the pistons counteract each other so as to be eliminated and allow the use of permanent grease-lubricated and sealed rolling bearings (22, 25, 26, 35, 36).

Abstract: A heat engine has one or more reciprocating pistons, an effect-receiving device for directly receiving the useful effect from the piston or pistons without any intermediary rotating effect-transmitting mechanism, and a synchronizing device for synchonizing the movements of the piston or pistons with the thermodynamic cycle.

Abstract: In a method for supplying heat to an engine for external heat supply, the combustion of fuel and combustion air takes place intermittently in a combustor. The combustor has a valve system for supplying the combustion air, an injection system for supplying the fuel, a heater for supplying heat to the engine, and an exhaust system for the emission of exhaust gases. The valve system is disposed before the fuel injection system, while a turbolator is disposed between the fuel injection system and the heater for mixing the fuel with the combustion air. The heater is so disposed in the combustor that the intermittent motion of the combustion gases is not interfered with. The engine for carrying out this method is so designed that the valve system is disposed before the fuel injection system and that a turbolator is disposed between the fuel injection system and the heater for mixing fuel and combustion air.

Abstract: In a method for compressing and heating a heating medium to be externally supplied to an engine, while using the energy available in the hot exhaust gases of the engine, the exhaust gases are caused to expand in at least two expansion stages to emit energy for compressing the heating medium in at least two compression stages, heat is transmitted from the exhaust gases after the first expansion stage to the heating medium after the last compression stage, and the heating medium is thereafter supplied with additional heat in a heat-producing unit before it is led to the engine.

Abstract: A method and plant for recovering heat from smoke gases in combustion plants, whereat the combustion air is compressed prior to being supplied to the combustion chamber of the plant. The compressed smoke gases from the combustion chamber are cooled, at a pressure which exceeds 1.5 atmospheres, to a temperature beneath 100.degree. C., preferably beneath 80.degree. C., and are then caused to expand in a turbine, whereat the energy released by said expansion is utilized for compressing the air of combustion.The plant comprises one or more compressors (2) which are arranged upstream of the combustion chamber (6) of the combustion plant and which compress the air of combustion; and a turbine (9) arranged downstream of the combustion chamber or chambers (6) for expanding the compressed smoke gases.

Abstract: A module for a double-acting four-cylinder Stirling engine includes a heater, two upper cylinder portions, two regenerator/cooler units which each have a flexibly interconnected regenerator and a cooler, two heater tube systems and two cooler tube systems. The upper cylinder portions and the regenerators extend into the heater, and are sealed and affixed thereto. The upper cylinder portions are connectible to two lower cylinder portions affixed to an engine block. The coolers are connectible to two lower cylinder portions affixed to the block. Each of the heater tube systems extends in the heater module from a respective upper cylinder portion to one of the regenerators of the engine; and, each of the cooler tube systems extends from a regenerator, through its respective cooler and through the cooler wall for connection to one of the lower cylinder portions.

Abstract: A double-acting Stirling engine has a central axis and four cylinders disposed along a straight line which intersects the central axis. Four regenerator/cooler units are disposed in a circle which is concentric with the axis. A tube system which connects the cylinders to the regenerator/cooler units includes first and second rings, both of which are formed of sets of tubes, and both of which are concentric with the central axis. The tubes in the first ring are connected to upper hot spaces of the cylinders; and, the tubes in the other ring are connected to the regenerators and to one of the tubes in the first ring.