Provided is a fuel injection valve capable of stably injecting a fuel formed into a thin film. The fuel injection valve includes: a valve seat including a fuel path and a valve seat portion therein; a valve member including an abutment portion configured to sit on the valve seat portion, for opening and closing the fuel path through separation and contact of the abutment portion away from and with the valve seat portion; and a fuel chamber brought into communication with the fuel path, in which: the fuel chamber includes slit-like injection holes for injecting a fuel; and each of the injection holes has a slit-like shape for making fuel flows to collide against each other in a long axis direction of each of the injection holes to form a liquid film in a direction crossing the long axis direction.

In an electromagnetic fuel injection valve for in-cylinder injection, a fuel injection hole is an elongated hole having a major axis and a minor axis, the major axis being curved into an arc shape having a radius that is smaller than a radius of a pitch circle of an inlet of the fuel injection hole. Accordingly, the electromagnetic fuel injection valve can ensure a required flow rate even when a penetrating power is decreased.

An object of the present invention is to provide a fuel injection valve capable of suppressing fuel adhesion to a nozzle surface. Therefore, an injection hole 107 has a curved surface portion 107E formed between a peripheral edge 107I of an inlet opening 107G and an inner peripheral surface 107F. The curved surface portion 107E has a center-side curved surface portion 107AE and an outer-peripheral-side curved surface portion 107BE. The center-side curved surface portion 107AE is formed to have a width W107AE that is larger than the width W107BE of the outer-peripheral-side curved surface portion 107BE.

A fuel injector includes a nozzle body having spray orifices formed therein each defining a spray orifice diameter dimension (d), and a plurality of spray ducts each in spray path alignment with one of the plurality of spray orifices and including a duct outlet defining a duct exit diameter dimension (D). Each of the spray ducts defines, together with the respective one of the spray orifices, a relative spray area reduction (SAR) at the duct outlet. The ratio of D/d is at least 14, and the SAR is 80% or greater. The configuration provides reduced soot production. Related methodology is disclosed.

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 one spray orifice for dispensing supplied fluid, and including at least one channel for supplying the fluid to the spray orifice. The spray orifice, the channel and/or the transition between the channel and the spray orifice being configured to form a swirl geometry of the spray orifice disk in such a manner, that during operation, due to interaction of one or more jets of the fluid emerging from the spray orifice in turbulence atomization, an oval cross-sectional pattern of the spray is formed, in particular, in the form of a flat spray.

Provided is a pre-chamber type diesel engine in which fuel injected from an injector mixes satisfactorily with air in a pre-combustion chamber. An injector injects fuel so as to be dispersed in a direction orthogonal to a vortex flow of air formed inside a pre-combustion chamber.

A nozzle (10) comprising a through-hole (20) having an optional initial section (36) in fluid communication with the inlet opening (21) of the through-hole (20), a fluid shearing section (40) in fluid communication with the outlet opening (32) of the through-hole (20), and an optional transition region (38) in fluid communication with the initial section (36) and the fluid shearing section (40). The initial section (36) has a relatively constant cross-sectional shape along at least a 20% portion of its length, a shape that converges to the transition region (38), or both. The transition region (38) is disposed along the through-hole length, with a relatively uniform, diverging, converging, diverging and converging, or converging and diverging cross-sectional area along its length. The fluid shearing section (40) has an upstream end in fluid communication with the transition region (38), and a diverging cross-sectional shape along at least a 20% portion of its length that has a minor axis length and a major axis length.

An injector nozzle having a first part having a stem and a flange, the flange having a flange surface, a body including a wall defining a hole, an annular nozzle ring having a first surface and a second surface wherein the first surface and/or the flange surface include a plurality of grooves, the stem being received in the hole, the first part being secured to the body to secure the nozzle ring in place such that the first surface engages the flange surface, the second surface engages the body, and the plurality of grooves define a plurality of injector holes.

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.

Methods and systems are provided for a fuel injector. In one example, a system comprises an injector spool valve having a fuel outlet shaped to flow fuel to different portions of a nozzle inlet based on an actuation of the injector spool valve, thereby adjusting a fuel injection angle of a fuel injection.