Fuel injection valve

A fuel injection valve comprising:

• a seat portion on which a valve body abuts;
• a plurality of injection holes having an inlet opening on a downstream side of the seat portion;
• and
• an injection-hole forming member in which the inlet opening is formed,
• wherein the plurality of injection holes has an inner peripheral surface extending from an inlet side to an outlet side and a curved surface portion formed between a peripheral edge of the inlet opening and the inner peripheral surface,
• in a cross section that includes an injection-hole center axis being a center axis of the injection hole and pass through a center-side peripheral edge portion and an outer-peripheral-side peripheral edge portion in a radial direction about an injection-valve center axis being a center axis of the injection valve, in the peripheral edge of the inlet opening,
• the curved surface portion has a center-side curved surface portion formed on an inner side of the center-side peripheral edge portion and an outer-peripheral-side curved surface portion formed on an inner side of the outer-peripheral-side peripheral edge portion, and
• the curved surface portion is configured so that a first area of a portion surrounded by the center-side curved surface portion, an extension line of an inner peripheral surface portion connected to the center-side curved surface portion in the inner peripheral surface, and a straight line connecting the center-side peripheral edge portion and the outer-peripheral-side peripheral edge portion is larger than second area of a portion surrounded by the outer-peripheral-side curved surface portion, an extension line of an inner peripheral surface portion connected to the outer-peripheral-side curved surface portion in the inner peripheral surface, and the straight line connecting the center-side peripheral edge portion and the outer-peripheral-side peripheral edge portion,
• the plurality of injection holes includes two injection holes having different inclination angles with respect to the central axis of the injection valve,
• among the two injection holes, the injection hole having a large inclination angle with respect to the central axis of the injection valve is configured such that the first area is larger than the first area of the injection hole having a small inclination angle, and
• wherein fuel injection valve is structurally configured so that multiple fuel flows interfere with and add each other to flow along the inner peripheral surface of the plurality of injection holes, so as to not cause flow separation, and to cause fuel to flow into the plurality of injection holes.

A fuel injection valve comprising:

• a seat portion on which a valve body abuts;
• a plurality of injection holes having an inlet opening on a downstream side of the seat portion;
• and
• an injection-hole forming member in which the inlet opening is formed,
• wherein the plurality of injection holes has an inner peripheral surface extending from an inlet side to an outlet side and a curved surface portion formed between a peripheral edge of the inlet opening and the inner peripheral surface,
• in a cross section that includes an injection-hole center axis being a center axis of the injection hole and pass through a center-side peripheral edge portion and an outer-peripheral-side peripheral edge portion in a radial direction about an injection-valve center axis being a center axis of the fuel injection valve, in the peripheral edge of the inlet opening,
• the curved surface portion has a center-side curved surface portion formed on an inner side of the center-side peripheral edge portion and an outer peripheral-side curved surface portion formed on an inner side of the outer-peripheral-side peripheral edge portion, and
• the curved surface portion is configured so that a first length of a curve connecting the center-side peripheral edge portion and an upstream side end portion of an inner peripheral surface portion connected to the center-side curved surface portion in the inner peripheral surface is longer than a second length of a curve connecting the outer-peripheral-side peripheral edge portion and an upstream side end portion of an inner peripheral surface portion connected to the outer-peripheral-side curved surface portion in the inner peripheral surface,
• the plurality of injection holes includes two injection holes having different inclination angles with respect to the central axis of the injection valve,
• among the two injection holes, the injection hole having a large inclination angle with respect to the central axis of the injection valve is configured such that the first length is larger than the first length of the injection hole having a small inclination angle, and
• wherein fuel injection valve is structurally configured so that multiple fuel flows interfere with and add each other to flow along the inner peripheral surface of the plurality of injection holes, so as to not cause flow separation, and to cause fuel to flow into the plurality of injection holes.