FUEL INJECTION VALVE, AND FUEL INJECTION APPARATUS PROVIDED WITH SAME

摘要

A fuel injection valve includes: a needle valve with a seat surface at the end; a nozzle body with a seat portion on which the seat surface rests and with an injection opening disposed downstream of the seat portion; and a swirl flow generating portion with a spiral groove for causing fuel injected via the injection opening to swirl. The seat surface includes a first contact point. The first contact point contacts a second contact point included in the seat portion when the valve is closed. When the valve is opened, a line segment drawn connecting the first contact point and the second contact point intersects a virtual straight line passing the bottom of a first groove portion that appears the most downstream of a cross section of the swirl flow generating portion in a plane including the central axis of the needle valve and the bottom of a second groove portion that appears one step upstream of the first groove portion. Thus, the fuel that is contracted as it passes through the spiral groove can avoid collision with the needle valve, so that a decrease in flow velocity of the fuel as it swirls through the spiral groove can be suppressed.