Pre-chamber jet igniter and engine including combustion chamber employing the same

An engine including a combustion chamber employing a pre-chamber jet igniter, comprising:

• a jet nozzle which injects at least one jet combustion flame from an atmosphere towards a space inside a combustion chamber having a reciprocating piston, in which the jet combustion flame serves as a source of ignition to combust fuel injected into the space inside the combustion chamber, and a explosion stroke is driven in the combustion chamber by combustion of the injected fuel;
• an intake valve which opens or closes a passage of an intake manifold at an upper portion of the combustion chamber;
• an exhaust valve which opens or closes a passage of an exhaust manifold through which exhaust gas generated in the combustion chamber flows;
• and
• a main injector which injects the fuel into the space inside the combustion chamber,
• wherein the pre-chamber jet igniter includes
• a compression block having a compression chamber in which external air supplied from an atmosphere and fuel injected into the air are mixed to create an air-fuel mixture;
• a sub-injector which is installed to the compression block to inject the fuel into the compression chamber;
• a pressurizing piston which varies a volume of the compression chamber to increase a pressure of the air-fuel mixture;
• a valve unit which is opened when the pressure of the air-fuel mixture is increased, so that the air-fuel mixture is discharged from the compression chamber;
• a combustion block with a combustion space in which the air-fuel mixture discharged through the valve unit is combusted;
• a spark plug which is installed to the combustion block and generates a spark to ignite the air-fuel mixture passing through the combustion block;
• and
• a jet nozzle which injects a combustion flame of the air-fuel mixture in a form of at least one jet combustion flame, and has a piston reciprocating in an injection direction of the jet combustion flame.