Nozzle and a method of making the same are disclosed. The method includes forming a material into a nozzle forming microstructured pattern comprising a plurality of nozzle hole forming features and planar control cavity forming features; forming at least one different material into a nozzle pre-form using the nozzle forming microstructured pattern, with the nozzle pre-form comprising a plurality of nozzle pre-form holes and sacrificial planar control cavities; and forming a nozzle from the nozzle pre-form, said forming the nozzle comprising removing enough of the at least one different material to remove the sacrificial planar control cavities so as to form a top surface of the nozzle pre-form into a top surface of the nozzle, and to form each of the nozzle pre-form holes into a nozzle through hole.

A fuel injection device includes a fuel injection valve at a position corresponding to a portion between intake ports in an internal combustion engine. The fuel injection valve includes a body and a needle inside the body. The fuel injection valve is disposed closer to a piston of the internal combustion engine than the intake ports are to the piston. A single fuel injection passage for conducting gaseous fuel is present between a valve seat of the fuel injection valve and a combustion chamber of the internal combustion engine. The flow cross section of the gaseous fuel in the fuel injection passage is larger on a side closer to the piston of the internal combustion engine than on a side closer to an ignition plug of the internal combustion engine over a specified length in an extending direction of the fuel injection passage.

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.

A fuel delivery system and a direct injector for directly injecting fuel into a cylinder are provided. In one example, a direct fuel injector includes a nozzle in fluidic communication with a fuel source, the nozzle includes a first set of orifices, each of the orifices in the first set arranged at a first orifice angle on an intake side of the nozzle. The direct fuel injector further includes a second set of orifices, each of the orifices in the second set arranged at a second orifice angle less than the first orifice angle on an exhaust side of the nozzle.

A nozzle hole of a nozzle plate is coupled to a fuel injection port of a fuel injection device via a swirl chamber and first and second fuel guide channels opened into the swirl chamber. The swirl chamber is formed by combining first and second elliptical-shaped recessed portions. The first fuel guide channel opens at a side of a short axis of the first elliptical-shaped recessed portion and a side of the short axis that does not overlap with the second elliptical-shaped recessed portion, and the second fuel guide channel opens at a side of a short axis of the second elliptical-shaped recessed portion and a side of the short axis that does not overlap with the first elliptical-shaped recessed portion. The first and second fuel guide channels have depths deeper than those of the swirl chamber and extend inside of the swirl chamber while gradually reducing cross-sectional areas.

A throttle body fuel injection system including a throttle body with at least one air intake, a fuel injector coupled to the throttle body at a fuel port and an annular ring coupled to the cylindrical inner wall of the air intake. The annular ring includes a primary fuel discharge orifice adjacent to the fuel port and a plurality of secondary fuel discharge orifices arranged radially around the annular ring for spraying atomized fuel into the air intake.

Nozzle and a method of making the same are disclosed. The method includes (a) providing a microstructured mold pattern defining at least a portion of a mold and comprising a plurality of replica nozzle holes and replica planar control cavities; (b) molding a first material into a nozzle forming microstructured pattern using the microstructured mold pattern, with the nozzle forming microstructured pattern comprising a plurality of nozzle hole forming features and planar control cavity forming features; (c) forming a second material into a nozzle pre-form using the nozzle forming microstructured pattern, with the nozzle pre-form comprising a plurality of nozzle pre-form holes and sacrificial planar control cavities; and (d) forming a nozzle from the nozzle pre-form, said forming the nozzle comprising removing enough of the second material to remove the sacrificial planar control cavities so as to form a top surface of the nozzle pre-form into a planar top surface of the nozzle, and to form each of the nozzle pre-form holes into a nozzle through hole.

Among all combinations of two injection holes, in a combination in which when the injection holes are offset such that their central axes are coincident with each other in inlet openings, an inter-injection hole angle formed by the central axes is minimized, the inter-injection hole angle between the two injection holes is represented as amin[deg], taper angles, which are formed by the respective contours of the injection hole inner walls in the cross sections along the virtual planes including the central axes of the two injection holes that allow the inter-injection hole angle to be minimized, are represented as a1 and a2[deg], and when fuel is injected from the injection holes, average pressure of the fuel in the fuel passage is represented as P[Mpa], and the injection holes are formed so as to satisfy a relationship: amina1+a2+0.5P.sup.0.6

A throttle body fuel injection system including a throttle body with at least one air intake, a fuel injector coupled to the throttle body at a fuel port and an annular ring coupled to the cylindrical inner wall of the air intake. The annular ring includes a primary fuel discharge orifice adjacent to the fuel port and a plurality of secondary fuel discharge orifices arranged radially around the annular ring for spraying atomized fuel into the air intake.

In a fuel injection valve having a nozzle hole plate wherein a nozzle hole is formed, the nozzle hole is formed with a flow path cross-section having an oval shape that has long axes and short axes, and the nozzle hole is formed having a tapered shape in which a flow path sectional area becomes larger from an entry-side open end portion toward an exit-side open end portion. The nozzle hole is formed such that a second angle that is an intersecting angle of opposing nozzle hole inner wall surface portions in an oblique section along the short axes of the entry-side open end portion and the exit-side open end portion, is greater than a first angle that is an intersecting angle of opposing nozzle hole inner wall surface portions in a longitudinal section along the long axes of the entry-side open end portion and the exit-side open end portion.