The proposed solution relates to a combustion chamber assembly of an engine (T), in which an overrun of a spark plug is defined with a specific outer cone and a specific inner cone, and mixing air holes of a first arrangement and of at least one second arrangement that lie at least partially in a partial region of the overrun of the spark plug, said overrun being defined by the outer cone and the inner cone and extending downstream of the spark plug as far as an inner apex point (Si) of the inner cone, are formed with a flow cross section which is different from a flow cross section which the mixing air holes adjoining in the circumferential direction (U) of the respective arrangement have.

An igniter (09) includes an elongated tubular housing (10) with a polygonal top (14) having a central aperture (16) defined therein, communicating into a central chamber (20) along a longitudinal axis to an end at a base (18). A terminal (13a) projects from the polygonal top (14). A channel (11a) along a longitudinal axis is formed within the housing (10) in which is mounted an insulator (15). At least a portion of the insulator (15) may extend from the base (18). An electrode (13) connected to the terminal (13a) or (13b) is embedded within the insulator (15), to an end in the base (18). Prongs (19) extend from the electrode (13) towards the outer periphery of the housing (10) or towards the central chamber (20). The prongs (19) end in proximity to the outer housing wall (11), or the inner housing wall (12). The prongs (19) may be one or more projections and have sharp edges for multiple and increased spark presentations. A ring (30) may be connected to the electrode (13), defining a heating element in the base (18). Electrical resistance of the igniter (09) is selected.

An igniter (09) includes an elongated tubular housing (10) with a polygonal top (14) having a central aperture (16) defined therein, communicating into a central chamber (20) along a longitudinal axis to an end at a base (18). A terminal (13a) projects from the polygonal top (14). A channel (11a) along a longitudinal axis is formed within the housing (10) in which is mounted an insulator (15). At least a portion of the insulator (15) may extend from the base (18). An electrode (13) connected to the terminal (13a) or (13b) is embedded within the insulator (15), to an end in the base (18). Prongs (19) extend from the electrode (13) towards the outer periphery of the housing (10) or towards the central chamber (20). The prongs (19) end in proximity to the outer housing wall (11), or the inner housing wall (12). The prongs (19) may be one or more projections and have sharp edges for multiple and increased spark presentations. A ring (30) may be connected to the electrode (13), defining a heating element in the base (18). Electrical resistance of the igniter (09) is selected.

The invention relates to a fuel injector (1), comprising: a pre-chamber (17) within the injector, a high-pressure injector part (3) for discharging combustible gas, which high-pressure injector part has a nozzle unit (5) and a reciprocating nozzle valve element (7), a nozzle-side end section of which is accommodated in a high-pressure chamber (11) of the high-pressure injector part (3), a pre-chamber assembly (39), within the framework of which the high-pressure chamber (11) of the high-pressure injector part (3) is separated over a nozzle-side end section, the high-pressure chamber being surrounded by the pre-chamber (17).

An auxiliary chamber (51) having a spark plug (54) and an auxiliary fuel injector is formed at the central part of the top surface of the main combustion chamber (2). When making an air-fuel mixture in the auxiliary chamber (51) burn by the spark plug (54), an air-fuel mixture in the main combustion chamber (2) is made to burn by jet flames ejected from the communicating holes (52). The injection ports of the auxiliary fuel injector (53) are oriented toward a tumble flow inflow peripheral region (R) which is located on the peripheral part of the end portion of the auxiliary chamber (51) at a place located on a side where the tumble flow W flows in from the communicating holes (52). When the tumble flow (W) is made to be generated in the main combustion chamber (2) by the tumble flow control valve (48), auxiliary fuel (QF) is injected from the auxiliary fuel injector (53) toward the tumble flow inflow peripheral region (R) of the auxiliary chamber (51).

An auxiliary chamber (51) having a spark plug (54) and an auxiliary fuel injector is formed at the central part of the top surface of the main combustion chamber (2). When making an air-fuel mixture in the auxiliary chamber (51) burn by the spark plug (54), an air-fuel mixture in the main combustion chamber (2) is made to burn by jet flames ejected from the communicating holes (52). The injection ports of the auxiliary fuel injector (53) are oriented toward a tumble flow inflow peripheral region (R) which is located on the peripheral part of the end portion of the auxiliary chamber (51) at a place located on a side where the tumble flow W flows in from the communicating holes (52). When the tumble flow (W) is made to be generated in the main combustion chamber (2) by the tumble flow control valve (48), auxiliary fuel (QF) is injected from the auxiliary fuel injector (53) toward the tumble flow inflow peripheral region (R) of the auxiliary chamber (51).

A pre-chamber is formed between the front end of a spark plug attached to the cylinder head and a thin pre-chamber wall sticking out from the inside wall surface of the cylinder head to the inside of a main combustion chamber. The communication holes communicating the inside of the pre-chamber and the inside of the main combustion chamber are formed inside the thin pre-chamber wall. The thin pre-chamber wall is formed into a shape with a cross-sectional area gradually decreasing from the inside wall surface of the cylinder head toward the inside of the main combustion chamber such as a conical shape, frustoconical shape, polygonal conical shape, or polygonal frustoconical shape. A ground side electrode portion of the spark plug is positioned inside the gas pocket, and a discharge is caused between the center electrode sticking out from the front end of the center electrode insulator and the ground side electrode portion at the time of ignition.

The magnetic valve recoil device is intended for a valve-type ignition pre-chamber having a stratification cavity connected by a stratification pipe, which a stratification valve can close, to a combustion chamber housing a primary charge, a stratification injector, and an ignition unit leading to the cavity in order to inject and ignite an initiator charge so as to ignite the primary charge via a torch ignition pre-chamber formed by the stratification valve with the stratification pipe when it is not closing the latter, the valve being otherwise kept in contact with the pipe by a magnetic field created by a magnetic field source.

An exothermic cutting rod comprising an ignition assembly portion and a main portion. The main portion may comprise a plurality of fuel rods and a rod housing that is configured to allow a flow of oxygen to the ignition assembly portion. The ignition assembly portion may comprise an ignition fuel housing and an ignition fuel, which is entirely contained within said exothermic cutting rod. The ignition fuel housing may have one or more windows that are configured to allow a heat source to ignite the ignition fuel, which then in turn ignites the fuel rods.

An ignition device ignites a mixture of air and fuel gas by plasma to generate an initial flame. The ignition device includes a spark plug having an inner conductor, a cylindrical outer conductor that holds the inner conductor inside, and a dielectric provided between the inner conductor and the outer conductor, and the spark plug configured to emit an electromagnetic wave to a plasma formation space between the inner conductor and the outer conductor to generate a plasma. The ignition device includes an electromagnetic wave power supply that generates the electromagnetic wave by inputting the electromagnetic wave power Ps to the spark plug and a power supply control unit that controls the electromagnetic wave power supply. The electromagnetic wave power supply is configured to generate high frequency power at a number of different frequencies. The power supply control unit outputs at least one of the plurality of high frequency powers generated by the electromagnetic wave power supply as the electromagnetic wave power.