Patent ID: 8083160

Claim:
An injector comprising: a valve body having an inner peripheral surface, which defines a fuel passage and which has a diameter reducing downstream with respect to a fuel flow direction, a valve seat section formed on the inner peripheral surface, a recess portion provided downstream of the valve seat section with respect to the fuel flow direction and an injection hole formed in the recess portion; a valve member that is arranged in the valve body such that the valve member can reciprocate in an axial direction and that has an outer peripheral surface defining the fuel passage with the inner peripheral surface of the valve body, the valve member having a seat section formed on the outer peripheral surface such that the seat section can be seated on the valve seat section and can separate from the valve seat section and a tip section arranged downstream of the seat section with respect to the fuel flow direction to face the recess portion, wherein the injector injects the fuel, which flows into a fuel chamber defined by the recess portion and the tip section, through the injection hole when the seat section separates from the valve seat section, the valve body is structured such that a virtual extended line extending from an inner peripheral surface portion of the inner peripheral surface, which provides the valve seat section, in a diameter reducing direction of the inner peripheral surface portion, along which a diameter of the inner peripheral surface portion reduces, exists at an inlet portion of the injection hole and intersects with an injection hole inner peripheral surface of the injection hole on a virtual plane including a central axis of the injection hole, and the tip section of the valve member has an inclined surface spreading inward in an annular shape from a downstream end of the seat section, the inclined surface spreading radially inward further than a position where the central axis of the injection hole intersects with the tip section.