Internal combustion engine equipped with an auxiliary combustion chamber

An internal combustion engine comprising:

• a cylinder block having a cyliner bore therein;
• a piston reciprocally movable in said cyliner bore;
• a cyliner head fixed onto said cyliner block and forming therein an auxiliary chamber having an axis, said cyliner head and said piston defining a main chamber therebetween;
• a raised portion formed on one side of an inner wall of said auxiliary chamber and dividing said auxiliary chamber into a first auxiliary chamber and a second auxiliary chamber;
• a connecting passage communicating sadi main chamber with said auxiliary chamber and tangentially connected to an inner wall of said second auxiliary chamber, which is located at a position opposite to said raised portion with respect to the axis of said auxiliary chamber;
• a spark plug arranged in a recess formed beneath said raised portion in said second auxiliary chamber, and;
• a fuel injector arranged in said first auxiliary chamber and having a first injection nozzle and a second injection nozzle, said first injection nozzle being directed to a tip of said raised portion and always injecting fuel independently of operating condition of the engine for forming a rich air-fuel mixture in said recess, said second injection nozzle injecting fuel when the load of the engine is increased beyond a predetermined level and being directed to the inner wall of said auxiliary chamber, which is located at a position opposite to said raised portion with respect to the axis of said auxiliary chamber.