An injector unit that can use a gaseous fuel such as CNG in an already-existing diesel engine and a spark plug that uses the injector unit, are provided. The injector unit includes an injector, an igniter having a resonance structure configured to boost an inputted microwave and a discharger configured to perform a discharge, and a casing configured to house therein the injector and the igniter. The igniter includes a first part configured to transmit the inputted microwave, a second part configured to perform a capacity coupling to attain an impedance matching between the microwave and the igniter, and a third part configured to transmit the capacity-coupled microwave to the discharger. Moreover, the igniter is bent at a boundary of the first part and the second part, a boundary of the second part and the third part, or inside the first part.

An injector unit that can use a gaseous fuel such as CNG in an already-existing diesel engine and a spark plug that uses the injector unit, are provided. The injector unit includes an injector, an igniter having a resonance structure configured to boost an inputted microwave and a discharger configured to perform a discharge, and a casing configured to house therein the injector and the igniter. The igniter includes a first part configured to transmit the inputted microwave, a second part configured to perform a capacity coupling to attain an impedance matching between the microwave and the igniter, and a third part configured to transmit the capacity-coupled microwave to the discharger. Moreover, the igniter is bent at a boundary of the first part and the second part, a boundary of the second part and the third part, or inside the first part.

An ignition device with a pre-combustion chamber for an internal combustion engine is disclosed. The internal combustion engine may have a plurality of cylinders. Each cylinder may define a main combustion chamber. The ignition device may have a first pre-combustion chamber part configured to at least partially accommodate a spark plug. The ignition device may also have a second pre-combustion chamber part defining at least a portion of the pre-combustion chamber. The second pre-combustion chamber part may include at least one orifice configured to be fluidly connected to the main combustion chamber. The second pre-combustion chamber part may be detachably mountable to the first pre-combustion chamber part, such that the first and second pre-combustion chamber parts are axially secured to one another and rotatable with respect to one another.

An ignition device with a pre-combustion chamber for an internal combustion engine is disclosed. The internal combustion engine may have a plurality of cylinders. Each cylinder may define a main combustion chamber. The ignition device may have a first pre-combustion chamber part configured to at least partially accommodate a spark plug. The ignition device may also have a second pre-combustion chamber part defining at least a portion of the pre-combustion chamber. The second pre-combustion chamber part may include at least one orifice configured to be fluidly connected to the main combustion chamber. The second pre-combustion chamber part may be detachably mountable to the first pre-combustion chamber part, such that the first and second pre-combustion chamber parts are axially secured to one another and rotatable with respect to one another.

An igniter for a dual fuel engine includes an igniter body having spray outlets formed in a nozzle and arranged in a plurality of outlet sets. The igniter further includes a plurality of outlet checks each movable in the igniter body to open and close the spray outlets in a respective one of the plurality of outlet sets, and spark electrodes mounted to the igniter body and forming a spark gap. The outlet sets vary set-to-set in at least one of spray angle, spray outlet number, or spray outlet size. Related methodology is disclosed.

An igniter for a dual fuel engine includes an igniter body having spray outlets formed in a nozzle and arranged in a plurality of outlet sets. The igniter further includes a plurality of outlet checks each movable in the igniter body to open and close the spray outlets in a respective one of the plurality of outlet sets, and spark electrodes mounted to the igniter body and forming a spark gap. The outlet sets vary set-to-set in at least one of spray angle, spray outlet number, or spray outlet size. Related methodology is disclosed.

Provided are an igniter-integrated thrust chamber for a rocket engine using a cryogenic fuel and liquid oxygen and a rocket including the thrust chamber. The thrust chamber includes a combustion chamber and a mixing head assembly, which is disposed at one side of the combustion chamber and is integrated with the combustion chamber.

A compression ignition engine may operate using autoignition resistant fuels by laser-assisted ignition where a focused laser beam directly heats a spray of fuel proximate to an injector nozzle to promote a lifted flame combustion avoiding knock that could occur with the ignition of premixed fuel.

The present invention pertains to a spark plug for an internal combustion engine, comprising a metal outer shell extending in a longitudinal direction from a proximal end to a distal tip end configured to be oriented towards a combustion chamber, said outer shell comprising a fixation portion for attachment of the spark plug to a metal sleeve of the internal combustion engine and arranged at a region proximal of the tip end, wherein the outer shell furthermore comprises a first contact surface arranged at a region distal of the fixation portion and configured to contact a distal end of the sleeve, when the spark plug is attached to the sleeve.

The present invention pertains to a spark plug for an internal combustion engine, comprising a metal outer shell extending in a longitudinal direction from a proximal end to a distal tip end configured to be oriented towards a combustion chamber, said outer shell comprising a fixation portion for attachment of the spark plug to a metal sleeve of the internal combustion engine and arranged at a region proximal of the tip end, wherein the outer shell furthermore comprises a first contact surface arranged at a region distal of the fixation portion and configured to contact a distal end of the sleeve, when the spark plug is attached to the sleeve.