Cylinder-injection fuel injection valve

A cylinder-injection fuel injection valve comprising:

• a housing main body;
• a valve assembly within said housing main body, and comprising:
• a unitary valve main body having a large-diameter cylinder portion and a small diameter cylinder portion;
• a shoulder portion defined between said large-diameter and said small diameter cylinder portions;
• a valve seat having a fuel injection aperture secured within said valve main body;
• and a valve body moved into and out of contact with said valve seat to close and open said fuel injection aperture;
• a seal for preventing combustion gas in a cylinder from leaking to said housing main body wherein said seal is held between a cylinder head and said shoulder portion when said valve assembly is inserted into an insertion port in said cylinder;
• and
• a securing means for securing said valve main body to said housing main body, said securing means fastening the outer circumferential side of said large-diameter cylinder portion and an engaging portion formed on said housing main body.