Combustion generating device of internal combustion engine

A combustion generating device of an internal combustion engine, comprising:

• an ignition unit generating a spark;
• and
• an injector unit comprising an injector generating a mixture of air and fuel by mixing the air and the fuel supplied thereto and injecting a flame into a combustion chamber, the flame being generated by applying the spark to the mixture, wherein the injector unit includes:
• a spark plug installed inside the injector;
• an injector body;
• a valve slidably mounted in the injector body, selectively receiving the fuel and the air according to a movement of the valve and mixing the received fuel and air to generate the mixture thereof, and injecting the generated mixture into the combustion chamber;
• a solenoid unit receiving a control signal from an engine control unit (ECU) and selectively moving the valve in the injector body in a longitudinal direction of the valve;
• an air supply port and a fuel supply port formed to the injection body for supplying the air and the fuel to the inside of the valve;
• a valve groove formed in the center of the injector body in a longitudinal direction of the injector body, wherein the valve is installed in the valve groove so as to move along the longitudinal direction of the valve;
• a fuel supply member mounted inside the valve and fixed to the injector body, wherein the valve is slidably mounted on an outer surface of the fuel supply member;
• and
• a fuel supply hole formed inside the fuel supply member, wherein
• the fuel supply hole extends to a lower portion of the fuel supply member along the longitudinal direction thereof and continuously fluid-communicating with the fuel supply port of the injector body,
• the fuel supply hole is fluid-connected with a plurality of fuel discharge holes formed along the longitudinal direction of the fuel supply hole, and each of the fuel discharge holes extends outward radially from the fuel supply hole,
• the valve has a plurality of valve discharge holes which is selectively fluid-connected to the plurality of the fuel discharge holes,
• the lower portion of the valve groove forms a mixing chamber between an outer circumference of the valve and an inner circumference of the injector body, and
• a lower portion of the mixing chamber has a shape that is opened or closed by a plug.