In-cylinder fuel injection valve

摘要

An in-cylinder fuel injection valve which can realize perfectly hollow conical spray with the minimum amount of center spray.When the outer diameter of a portion of a valve supported by a turning body in such a manner that it can move in an axial direction is represented by D1, the inner diameter of a center hole is represented by D2 and the outer diameter of an inner annular groove is represented by D3, 2x(D2-D1)<D3-D1, and the total of the volume of a space surrounded by a valve seat, the turning body and the valve when the valve is closed and the volume of the inner annular groove is set to 0.25 mm3 or less.