A fuel supply nozzle unit includes a fuel supply nozzle, a rear end and an end plate. The fuel supply nozzle includes a front end that has a plurality of fuel supply holes. The rear end extends from the front end and is formed with a threaded portion on its outer surface. The end plate is connected to the rear end and is formed with a plurality of threaded holes.

Methods of electroforming fuel injector nozzle structures such as, e.g., nozzle plates, valve guides, combinations of nozzle plates and valve guides, etc., as well as other articles incorporating microstructured features. The methods described herein can be used to electroform articles with high aspect ratio features in close proximity while reducing the likelihood of void formation during the electroforming process.

Nozzles and method of making the same are disclosed. The disclosed nozzles have at least one nozzle through-hole therein, wherein the at least one nozzle through-hole exhibits a coefficient of discharge, C.sub.D, of greater than about 0.50. Fuel injectors containing the nozzle are also disclosed. Methods of making and using nozzles and fuel injectors are further disclosed.

A nozzle hole of a nozzle plate is connected to a fuel injection nozzle of a fuel injection unit through a swirl chamber and first and second fuel guide grooves opened to the swirl chamber. The swirl chamber is an oval recess provided with the nozzle orifice in its center. A first fuel guide groove is opened to one end side of a major axis of the oval recess, and a second fuel guide groove is opened to the other end side of the major axis of the oval recess. The first and second fuel guide grooves are formed such that the same amount of fuel flows to the swirl chamber. The same amount of fuel flowing from the first and second fuel guide grooves to the swirl chamber is guided to the nozzle orifice at the same time while revolving inside the swirl chamber in the same direction.

A fluid injector for injecting fluid is disclosed, including a body; a fluid passageway defined in the body and extending from an inlet to an outlet of the fluid injector; a valve seat disposed internally of the body and forming part of the passageway; a valve element that is selectively reciprocated relative to the valve seat to close and open the passageway to fluid flow by seating and unseating the valve element on and from the valve seat, respectively; and an orifice disc disposed in the passageway downstream of the valve seat in a direction of the fluid flow through the fluid injector, the orifice disc including a plurality of dimples and a plurality of orifices defined through the orifice disc, each dimple including at least one orifice located thereon and each dimple having an asymmetrical cross-section.

A fluid injector for injecting fluid is disclosed, including a body, a fluid passageway defined through the body and extending from an inlet to an outlet of the fluid injector; a valve seat disposed internally of the body and forming part of the passageway; and a valve element that is selectively reciprocated relative to the valve seat to close and open the passageway to the flow of fluid by seating and unseating the valve element on and from the valve seat, respectively. The fluid injector further includes an orifice disc disposed in the passageway downstream of the valve seat in a direction of the flow of fluid through the fluid injector. The orifice disc includes a plurality of dimples and a plurality of orifices defined through the orifice disc, with each dimple including at least one orifice defined therethrough.

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. Fuel flow is precluded at a sac volume of the fuel injector.

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 fuel injector (1) including a fuel injector housing (2), a valve seat (4) formed at one end of the fuel injector housing, and a valve body (10) disposed in the fuel injector housing and operable to open and close a spray hole (20) in the valve seat. The valve seat includes a base portion (16) and insert portion (26) having spray holes (8) that is secured to the base portion (16).

A dual-fuel injector to be arranged in a dual-fuel injection equipment of an internal combustion engine extends along a main axis from a top-head to a nozzle-tip. A first circuit conveys a first fuel to a first set of injection holes and a second circuit conveys a second fuel to a second set of injection holes.