Methods and systems are provided for a fuel injector. In one example, a system may include an injector comprising two or more passages shaped to flow a mixture in opposite directions before injecting the mixture.

A fuel injector and method are disclosed wherein an injector body defines a cavity and passages from an inlet at the cavity through an outside surface of the injector body. Each passage may have a first inner contour at a first angle and a second inner contour at a second angle. An injector pin with a fuel pass-though volume may be movable within the cavity to selectively overlap an outlet of the pass-through volume with an inlet of the passages to selectively direct fuel in varying quantities along the first second inner contours.

A gas turbine engine fuel nozzle comprises a spray tip defining a fuel exit passage therethrough that extends along a central axis. The fuel exit passage has an exit orifice aligned with the central axis. The exit orifice is circumscribed by an inner annular surface. The inner annular surface has a spherically-convex profile in cross-section, the profile being constant around the circumference of the inner annular surface.

An object of the present invention is to provide a fuel injection valve that can be used in a gasoline engine and can take fuel into an injection hole with a small pressure loss near a seat portion on which a valve is seated. Thus, the present invention provides a fuel injection valve for a gasoline engine which includes: a plurality of injection holes; and a seat portion that opens and closes a fuel passage to the plurality of injection holes in cooperation with a valve. At least one fuel injection hole among the plurality of injection holes is configured in a shape such that an injection hole inlet has a long axis and a short axis, and the long axis is directed in a direction in which an extension line intersects with the seat portion.

Methods and systems are provided for a multi-hole nozzle of a fuel injector. In one example, a nozzle for a fuel injector may include multiple nozzle holes arranged at a nozzle tip, where each nozzle hole has a straight flow axis and a cross-section that twists around the straight flow axis, from an inlet to an outlet of the nozzle hole. Additionally, a long side of the cross-section may increase in length, along the nozzle hole, from the inlet to the outlet.

A fuel injector for an internal combustion engine. The fuel injector has a needle and a nozzle that inter-relate with each other in assembly. Relative movement between the needle and nozzle bring the fuel injector between a closed state of operation and an open state of operation amid use of the fuel injector. The nozzle has one or more passages therein through which fuel is discharged.

A method of fabricating a fuel injector nozzle comprising the steps of: (a) forming a first microstructured pattern in a first material; (b) replicating the first microstructured pattern in a second material to make a first mold comprising a second microstructured pattern in the second material; (c) replicating the second microstructured pattern in a third material to make a second mold comprising a third microstructured pattern comprising a plurality of microstructures in the third material; (d) replicating the third microstructured pattern in a metal material to make a replicated structure; and (e) removing the third material resulting in a nozzle having a plurality of through-holes through the metal material and corresponding to the plurality of microstructures in the third microstructured pattern. Each of the plurality of through-holes has a hole wall connecting a hole entry to a hole exit, and the hole wall of at least one through-hole has a side that curves from its hole entry to its hole exit.

A nozzle plate has a plurality of blades in the area that surrounds the nozzle hole on the outer plane of the bottom wall part. When the fuel is injected from the nozzle hole and the pressure in the vicinity of the nozzle hole is reduced, the plurality of blades guide a flow of air from the radially outward side of the bottom wall part to the radially inward side of the bottom wall part and generates a swirling flow of the air about the center of the bottom wall part. The swirling flow of the air about the center of the bottom wall part changes to a helical flow by receiving kinetic momentum from fine particles of the fuel injected from the nozzle hole and the helical flow of the air transports the fine particles of the fuel.

A valve (or fuel injector), which provides that the valve-seat member exhibits high structural strength and fatigue strength under vibratory stresses, includes an excitable actuator for actuating a valve-closing member which, with a valve-seat face on the valve-seat member, forms a sealing seat, and injection openings which are downstream of the valve-seat face, the injection openings being in a center area of the valve-seat member projecting outwardly dome-like in the injection direction. The dome-like center area has a curved outer contour, the curvature in a radially inner section having a larger radius than the radius of the curvature in a radially outer section of the dome, which ends radially outside the mouth areas of all injection openings, in a recessed depression, that is followed radially outwardly by an axially projecting edge area of the valve-seat member. The fuel injector directly injects fuel into a combustion chamber of an engine.

Methods of making nozzles are disclosed. More specifically, methods of making nozzles that may be used as components of a fuel injection system are disclosed.