A pre-chamber spark plug for a combustion chamber of an internal combustion engine has a pre-chamber which has a plurality of openings and which is fluidically connectable to the combustion chamber via the openings. Two spark gaps are arranged in the pre-chamber via which respective sparks can be formed. The spark gaps are arranged symmetrically distributed in the pre-chamber and a first of the spark gaps is arranged further outwards than the second spark gap along a direction extending perpendicularly to the longitudinal direction of the pre-chamber spark plug.

A spark ignited engine is disclosed. The spark ignited engine includes a main combustion chamber and a cylinder head at least partially surrounding the main combustion chamber. A spark plug having a central axis is arranged in the cylinder head and an ignition end of the spark plug faces the main combustion engine. A pre-chamber with at least two nozzles is arranged in the main combustion chamber and connects the ignition end and the main combustion chamber via the at least two nozzles. A pre-chamber volume ratio corresponds to a ratio of a volume of the pre-chamber to a volume of the main combustion chamber at a top-dead-center and is between 1.9% and 3.1%. A nozzle factor corresponds to a ratio of a summed flowed-through area of the at least two nozzles to the volume of the pre-chamber and is between 0.085 l/cm and 1.15 l/cm.

A spark ignited engine is disclosed. The spark ignited engine includes a main combustion chamber and a cylinder head at least partially surrounding the main combustion chamber. A spark plug having a central axis is arranged in the cylinder head and an ignition end of the spark plug faces the main combustion engine. A pre-chamber with at least two nozzles is arranged in the main combustion chamber and connects the ignition end and the main combustion chamber via the at least two nozzles. A pre-chamber volume ratio corresponds to a ratio of a volume of the pre-chamber to a volume of the main combustion chamber at a top-dead-center and is between 1.9% and 3.1%. A nozzle factor corresponds to a ratio of a summed flowed-through area of the at least two nozzles to the volume of the pre-chamber and is between 0.085 l/cm and 1.15 l/cm.

An internal combustion engine for a motor vehicle includes a combustion chamber in which a first tumble-shaped current of a fuel-air mixture is settable. A pre-chamber spark plug is allocated to the combustion chamber which has a pre-chamber which is fluidically connected to the combustion chamber via a plurality of openings where via the plurality of openings a part of the fuel-air mixture flows out of the combustion chamber and into the pre-chamber. The plurality of openings are formed such that the part of the fuel-air mixture that flows into the pre-chamber via the plurality of openings has a second tumble-shaped current where the second tumble-shaped current is opposite to the first tumble-shaped current.

An internal combustion engine for a motor vehicle includes a combustion chamber in which a first tumble-shaped current of a fuel-air mixture is settable. A pre-chamber spark plug is allocated to the combustion chamber which has a pre-chamber which is fluidically connected to the combustion chamber via a plurality of openings where via the plurality of openings a part of the fuel-air mixture flows out of the combustion chamber and into the pre-chamber. The plurality of openings are formed such that the part of the fuel-air mixture that flows into the pre-chamber via the plurality of openings has a second tumble-shaped current where the second tumble-shaped current is opposite to the first tumble-shaped current.

A spark plug includes a housing, a porcelain insulator, a center electrode, a ground electrode, and a prechamber-defining portion. The prechamber-defining portion has a prechamber formed therein. The prechamber-defining portion has a plurality of spray holes. At least one of the spray holes is an upstream spray hole which is arranged upstream of a plug center axis in a gas flow within a main combustion chamber and designed such that and an angle which an extension in an opening direction makes with an inner wall surface of the prechamber is selected to be larger than 90°. A spark gap is formed upstream of a plug center axis in the gas flow within the main combustion chamber.

A pre-chamber ignition system for a spark-ignited reciprocating piston internal combustion engine includes a housing where the housing is installable in a cylinder head of the spark-ignited reciprocating piston internal combustion engine and where the housing has a cavity. An ignition device is disposed in the housing and the ignition device projects into the cavity of the housing. A cover covers the cavity with respect to a combustion chamber of the spark-ignited reciprocating piston internal combustion engine and the cavity and the combustion chamber are connectable together in a gas-guiding manner by an aperture in the cover. The housing consists of a material having a thermal conductivity of more than 170 W/(m*K) and the cover consists of a material having a thermal conductivity of less than 170 W/(m*K).

A pre-chamber ignition system for a spark-ignited reciprocating piston internal combustion engine includes a housing where the housing is installable in a cylinder head of the spark-ignited reciprocating piston internal combustion engine and where the housing has a cavity. An ignition device is disposed in the housing and the ignition device projects into the cavity of the housing. A cover covers the cavity with respect to a combustion chamber of the spark-ignited reciprocating piston internal combustion engine and the cavity and the combustion chamber are connectable together in a gas-guiding manner by an aperture in the cover. The housing consists of a material having a thermal conductivity of more than 170 W/(m*K) and the cover consists of a material having a thermal conductivity of less than 170 W/(m*K).

A spark-ignited reciprocating piston internal combustion engine may include a pre-chamber ignition system which is arranged in the cylinder head of the reciprocating piston internal combustion engine and in which an ignition device is arranged, comprising an ignition electrode in a housing, said ignition electrode protruding into a cavity of the pre-chamber ignition system. The cavity is covered from the combustion chamber of the reciprocating piston internal combustion engine by a cover, and the cover has at least one first opening which connects the cavity and the combustion chamber together so as to conduct gas. A metal transverse brace with at least one second opening, which connects opposite sides of the housing together, is arranged in the cavity in the region of the ignition electrode, wherein the metal transverse brace is made of a first metal material in a central region and a second metal material in a region contacting the housing.

A spark-ignited reciprocating piston internal combustion engine may include a pre-chamber ignition system which is arranged in the cylinder head of the reciprocating piston internal combustion engine and in which an ignition device is arranged, comprising an ignition electrode in a housing, said ignition electrode protruding into a cavity of the pre-chamber ignition system. The cavity is covered from the combustion chamber of the reciprocating piston internal combustion engine by a cover, and the cover has at least one first opening which connects the cavity and the combustion chamber together so as to conduct gas. A metal transverse brace with at least one second opening, which connects opposite sides of the housing together, is arranged in the cavity in the region of the ignition electrode, wherein the metal transverse brace is made of a first metal material in a central region and a second metal material in a region contacting the housing.