A spray disc arrangement for a fluid injector includes a first disc having a dimple with an orifice defined through the dimple. A second disc includes a dimple and a plurality of orifices defined through the dimple. The first disc dimple is received in the second disc dimple. The second disc includes a plurality of channels defined along a concave surface of the dimple, with the plurality of orifices located in the channels. The first disc and the second disc are coupled together such that a convex surface of the dimple of the first disc contacts a concave surface of the dimple of the second disc. The first disc is disposed along a downstream side of a valve seat of the fluid injector.

A fuel injector is provided that includes various precise configuration parameters, including dimensions, shape and/or relative positioning of fuel injector features, resulting in improved efficiency of fuel flow through the fuel injector.

A fuel injector is provided that includes various precise configuration parameters, including dimensions, shape and/or relative positioning of fuel injector features, resulting in improved efficiency of fuel flow through the fuel injector.

A nozzle plate is to be attached to a fuel injection port of a fuel injection device and injects fuel from the fuel injection port into an intake pipe through nozzle holes. The outlet side openings of the nozzle holes are partially blocked by interference bodies to determine the fuel injection directions and form orifices for reducing flows of the fuel at the outlet side openings. The plurality of orifices have different fuel injection directions, fuel fine particles in sprays draw ambient air, and the drawn air is provided with kinetic momentum to generate a spiral air flow. The nozzle plate is formed by cooling and solidifying molten resin having filled the cavity of a die.

A fuel injector is provided. The fuel injector includes a sleeve having a first end proximate an outlet; a piston slidingly received in the sleeve, the piston having a first end proximate the outlet; a pumping chamber at least partially defined by the sleeve between the first end of the piston and the outlet; and a normally-open inlet valve through which fuel passes to enter the pumping chamber.

A gate is disposed so as to be opened to a cavity portion for forming a plate body part for forming a fuel injection device nozzle plate, and the cavity portion forms a portion surrounded by a plurality of nozzle holes. There are no differences in the times required for the molten resin injected from the gate into the cavity to reach portions for forming the plurality of nozzle holes. As a result, a molding failure of the nozzle holes and the vicinity thereof caused by differences in the charge speeds of molten resin can be prevented and the shapes of the nozzle holes and the vicinity thereof can be formed accurately.

A fuel injector includes an injector tip defining a plurality of injection apertures. A first control device is coupled to the injector tip, and is operable to control fluid flow through at least a first one of the plurality of injection apertures. A second control device is coupled to the injector tip, and is operable to control fluid flow through at least a second one of the plurality of injection apertures. The first control device and the second control device each include a MEMS or a NEMS flow controller for controlling fluid flow through a respective injection aperture, and are independently operable relative to each other to provide variable fluid flow rates and/or injection spray patterns.