Abstract: A reciprocating internal combustion engine includes a reciprocating piston in a cylinder bore of a cylinder housing forming an assembly together with a cylinder head. Two connecting rods are connected between the piston and first and second crankshafts. The two crankshafts are functionally connected to two synchronization gears of a spur gear box. The synchronization gears are connected to the crankshafts in a torque-proof manner such that the crankshafts rotate synchronously in opposite directions. The engine operates based on the diesel principle and with exhaust gas turbocharging, wherein the engine is an outboard engine for a watercraft. The exhaust gas turbocharger has an exhaust gas turbine and a compressor and/or a shaft which carries a turbine wheel and a compressor wheel which runs perpendicular to the longitudinal dimension of the watercraft. The turbocharger is attached on an upper end-face wall of the assembly.

Abstract: A reciprocating internal combustion engine includes a reciprocating piston in a cylinder bore of a cylinder housing forming an assembly together with a cylinder head. Two connecting rods are connected between the piston and first and second crankshafts. The two crankshafts are functionally connected to two synchronization gears of a spur gear box. The synchronization gears are connected to the crankshafts in a torque-proof manner such that the crankshafts rotate synchronously in opposite directions. The engine operates based on the diesel principle and with exhaust gas turbocharging, wherein the engine is an outboard engine for a watercraft. The exhaust gas turbocharger has an exhaust gas turbine and a compressor and/or a shaft which carries a turbine wheel and a compressor wheel which runs perpendicular to the longitudinal dimension of the watercraft. The turbocharger is attached on an upper end-face wall of the assembly.

Abstract: A piston with at least one compression ring, a top end and a longitudinally extending axis for an internal combustion engine. The piston includes at least one compression ring groove defined by first and second spaced lateral surfaces for receiving the at least one compression ring. The first lateral surface is located nearest the top end of the piston. At least one of the first and second surfaces includes a plurality of profiles extending circularly around the axis and having a depth in the range of 0.003 mm to 0.015 mm and a width in the range of 0.02 mm to 0.2 mm.

Abstract: An electrical line-connector device for safety application. The electrical contacts of the two-part line-connector which connect electrical conductors with one another are flush contacts, which come into contact when the connecting parts are brought together. Each connecting part contains a part of a holding-magnet arrangement which includes a permanent magnet, assuring the holding-together of the connecting parts and the required contact pressure. The one connecting part contains a switch device which is formed in such a way that the flush contacts only carry voltage when the connecting parts are placed together. The switch device can be a familiar magnetic switch, which is switched on by the permanent magnet in the other connecting part when the connecting parts are placed together.