Abstract: A two-stroke cycle is applicable to classical internal combustion engines (piston-rod-crankshaft) as well as to engines with a two-sided piston. At least one pair of cylinders of which one is a compressor (pump) cylinder and other is an engine cylinder. The compressor and the engine pistons have such a phase delay to each other that when one piston is in the midpoint between two “dead points” of the engine, the other is in one of the “dead points”. At the moment when the compressor piston has passed half the way from the lower dead point (LDP) to the upper dead point (UDP), it also has precompressed the sucked air, while the engine piston is at LDP and has opened an exhausting channel, which lets out the combustion gas. Because of the higher pressure in the compressing pipe relating to the pressure in the engine cylinder, an inlet valve of the engine opens and fresh air enters the engine.

Abstract: This two-stroke cycle is applicable at classical internal combustion engines (piston-rod-crankshaft) as well as at engines with two-sided piston. The very systems has at least one pair of cylinders (1, 2) of which one (1) is compresor (pump) and other (2) is engine. The compressor and the engine pistons (3, 4) have such phase delay to each other that when one piston is in the midpoint between two “dead points” of the engine, other is in one of “dead points”. At the moment when the compressor piston (3) has passed half the way from LDP to UDP, it also has precompressed the sucked air, while the engine piston (4) is at LDP and has opened the exhausting channel (15), which leaves out the combustion gas. Because of the higher pressure in the compressing pipe relating to the pressure in engine cylinder (2), the inlet valve (7) of the engine opens and fresh air enters the engine.

Abstract: In an internal combustion engine comprising an engine block housing at least two reciprocating pistons being each provided in a cylinder comprising at least an inlet valve and an exhaust valve, which pistons are coupled with a crankshaft being coupled with a drive shaft and/or operating shaft, the at least two pistons are arranged in cylinders being placed at an angle of 90.degree. C. to each other. Furthermore the crankshaft is coupled eccentrically with extensions of the pistons, which extensions are integral with the pistons and are protruding from the pistons opposite of the piston surface, and the drive shaft and/or operating shaft are coupled with the crankshaft with the same eccentricity.

Abstract: In an internal combustion engine comprising an engine block housing at least one reciprocating piston being provided in a cylinder comprising at least one inlet valve and an exhaust valve, which piston is coupled with a crankshaft being coupled with a drive and/or working shaft, there is at least one two-sided piston reciprocating in two coaxial chambers each of a cylinder. Each chamber is provided on opposite sides of the crankshaft, wherein the at least one two-sided piston comprises a central bearing, through which the crankshaft is passing, and wherein the drive and/or working shaft is coupled eccentrically with the crankshaft.