A first injection hole included by an injection nozzle is formed such that an angle that a first virtual line passing a first inner-wall-side center point away from a center axis by a predetermined first distance, forms with the center axis becomes a first injection angle, and an angle that first injection hole inner walls form becomes a first open angle. A second injection hole included by the injection nozzle is formed such that an angle that a second virtual line passing a second inner-wall-side center point away from the center axis by a predetermined second distance, forms with the center axis becomes a second injection angle that is smaller than the first injection angle, and an angle that second injection hole inner walls form becomes a second open angle that is larger than the first open angle.

In order to achieve stable combustion in an internal combustion engine, the engine includes a fuel injection valve having a first nozzle hole and a second nozzle hole, and an spark plug disposed at a position through which the swirling flow flows, and which is at the downstream side of the flow of the swirling flow from an extension line of the first nozzle hole and at the upstream side of the flow of the swirling flow from an extension line of the second nozzle hole, for igniting a spray of fuel injected from the fuel injection valve, wherein the first nozzle hole and the second nozzle hole are formed in such a manner that the shortest distance from the extension line of the first nozzle hole to the spark plug becomes longer than the shortest distance from the extension line of the second nozzle hole to the spark plug.

An internal combustion engine includes a piston and a fuel injection valve. The fuel injection valve includes a first injection hole, a second injection hole, a first needle configured to open and close the first injection hole, and a second needle configured to open and close the second injection hole. The first injection hole and the second injection hole are configured such that a portion of a fuel spray injected from the first injection hole and a portion of a fuel spray injected from the second injection hole overlap each other at a position apart at a predetermined distance from a side wall of a cavity of the piston. The second needle is configured to start operation in order to open the second injection hole after a predetermined time has elapsed from a point of time when the first needle starts operation in order to open the first injection hole.

A fuel injection valve has first injection holes, second injection holes, a first needle that opens and closes the first injection holes, and a second needle. The fuel injection valve is arranged such that a part of fuel injected from the first injection hole and a part of fuel injected from the second injection hole are gathered together at a position spaced from the side wall of the cavity by a predetermined distance. The second needle starts operating to open the second injection holes, after a predetermined time elapses from a point in time at which the first needle starts operating to open the first injection holes.

An object of the present invention is to provide a fuel injection device in which fuel sprays hardly adhere to an intake valve, a wall surface in an engine cylinder, or a piston.

In a fuel injection device including a valve body 114 and a seat surface 601 to perform injection and sealing of fuel cooperatively and a plurality of injection holes 501 and 502 of which inlet opening surfaces are formed on the seat surface 601, a first injection hole 501 and a second injection hole 501 and 502 arranged closest to the first injection hole 501, which configure the plurality of injection holes 501 and 502, are configured such that the first injection hole 501 is larger than the second injection hole 502 in an injection hole angle to be an angle formed by a normal direction 601a of the seat surface 601 and a center axis 119a of the injection hole (1>2) and the second injection hole 502 is larger than the first injection hole 501 in an area of a cross-section perpendicular to the center axis 119a of the injection hole (injection hole diameter Da2>injection hole diameter Da1).

In an injection hole set, primary and secondary injection holes are formed to satisfy the following relationship: t1+t20.87P0.52, where (deg) is an injection-hole-to-injection-hole angle, which is an angle formed between a primary central axis of the primary injection hole and a secondary central axis of the secondary injection hole; t1 (deg) is a primary taper angle, which is an angle formed between outlines of a primary injection hole inner wall of the primary injection hole in a cross section of the primary injection hole inner wall; t2 (deg) is a secondary taper angle, which is an angle formed between outlines of a secondary injection hole inner wall of the secondary injection hole in a cross section of the secondary injection hole inner wall; and P (MPa) is an average pressure of the fuel in a fuel passage at a time of injecting the fuel from the injection holes.

An object of the present invention is to provide a fuel injection device in which variations in an injection flow rate for each injection is suppressed and an injection amount is stabilized.

The fuel injection device according to the present invention includes: a valve element that is seated on or unseated from a valve seat; a plurality of guide parts (302a, 302b, 302c) that slidably guide the valve element; and flow paths (306a, 306b, 306c) sandwiched between the guide parts in a circumferential direction. In the fuel injection device, one guide part (302a) among the plurality of guide parts is formed to have a longer circumferential length than that of other guide parts (302b, 302c).

A spark-ignition direct fuel injection valve includes, at least, a seat member provided with a fuel injection hole and a valve seat and a valve body which controls fuel injection from the injection hole by contacting and separating from the valve seat. In the spark-ignition direct fuel injection valve: the injection hole has an injection hole inlet which is open inwardly of the seat member and an injection hole outlet which is open outwardly of the seat member; an opening edge of the injection hole inlet has a first round-chamfered portion formed on an upstream side with respect to a fuel flow toward the injection hole inlet; and an extending length (L) of the injection hole does not exceed three times a hole diameter (D) of the injection hole.

At least one of nozzle holes is provided as a non-circular nozzle hole where the ratio of the longest diameter to the shortest diameter of an outlet opening portion is greater than 1. A virtual non-circular cone and a virtual circular cone are defined for each of the non-circular nozzle hole and a circular nozzle hole where the ratio of the longest diameter to the shortest diameter of the outlet opening portion is 1. At least two adjacent nozzle holes are formed such that the virtual non-circular cone does not interfere with the virtual circular cone or the virtual non-circular cone.

A spray orifice disk for a valve for a flowing fluid and, in particular, for a metering or injection valve for an internal combustion engine, including a disk body and a spray orifice set-up, which is formed in the disk body and is configured with at least three spray orifices, each for dispensing supplied fluid. The spray orifices are being configured to form a swirl geometry of the spray orifice disk in such a manner that during operation, a combined spray is formed from at least three individual jets by interaction of a plurality of at least three individual jets of fluid emerging in atomized form from the spray orifices.