Abstract: An external combustion engine comprising a body (8), at least one working chamber (18), combustion chamber (13), crankcase (21) and compression chamber (6), at least one working piston (20), compression piston (7) and crank mechanism (22), and a valve gear and a heat exchanger, and wherein the required air is drawn by suction from the air surrounding the engine via valves or equivalent. After the working cycle, the expanded hot air is directed from the working chamber (18) through a valve (12) or (24) past the heater (17) into the combustion chamber (13), to be used as combustion air.

Abstract: An external combustion engine comprising a body (8), at least one working chamber (18), combustion chamber (13), crankcase (21) and compression chamber (6), at least one working piston (20), compression piston (7) and crank mechanism (22), and a valve gear and a heat exchanger, and wherein the required air is drawn by suction from the air surrounding the engine via valves or equivalent. After the working cycle, the expanded hot air is directed from the working chamber (18) through a valve (12) or (24) past the heater (17) into the combustion chamber (13), to be used as combustion air.

Abstract: Thermal machines are known in prior art. They generally differ considerably from the theoretically most advantageous engine in respect of pressure-volume cycles or have a complicated structure. The object of the present invention is to eliminate these drawbacks and achieve a new type of thermal machine. The advantages of the invention include a nearly ideal phasing of pressure-volume cycles, built-in power regulation and insignificant mechanical losses. This is achieved by using inversely linked connecting rods (9), four-chamber cylinders and a crankshaft (7) provided with rolling contact bearings with insertable rolling elements.