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 nozzle includes a nozzle body having a nozzle cavity and a nozzle tip defining an end of the nozzle body. The fuel injector nozzle further includes one or more injection orifices having a first diameter, the one or more first injection orifices being located a first distance from the end of the nozzle body and connecting the nozzle cavity to a combustion chamber of an engine. The fuel injector nozzle also includes one or more second injection orifices having a second diameter that is different than the first diameter, the one or more second injection orifices being located at a second distance from the end of the nozzle body and fluidly connecting the nozzle cavity to the combustion chamber.

An object of the present invention is to enable forming of fuel sprays capable of suppressing discharge of PN, HC, and the like. Thus, in a fuel injection device 100 having a plurality of injection holes, the fuel injection device includes a first injection hole group 801 that is directed in a direction on an exhaust valve 211 side with respect to an intake valve 205 side, and a second injection hole group 802 that is directed in a direction on the intake valve 205 side with respect to the exhaust valve 211 side. A flow rate of the second injection hole group 802 is larger than a flow rate of the first injection hole group 801.

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 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.

The present invention provides a fuel injector capable of suppressing separation of a fuel flow in an injection port during fuel injection. A fuel injector (30) includes plural injection ports (31a to 31f), each of which injects the fuel into an internal combustion engine (10). The plural injection ports (31a to 31f) are provided in plural on a first circle with a first radius (R1) and on a second circle with a larger second radius (R2) than the first radius (R1), and includes: a first injection port (31a), a center of an opening of which is provided on the first circle; and a second injection port (31c), a center of an opening of which is provided on the second circle on an opposite side of a tangent of the first circle, which passes the center of the opening of the first injection port, from a center axis (CF1) of the fuel injector (30). When seen in a cross section on the shortest line connecting the center of the first injection port (31a) and the center of the second injection port (31c), a first angle (θ1) defined by a center axis (CF2) of the first injection port (31a) and the center axis (CF1) of the fuel injector (30) is larger than a second angle (θ2) defined by a center axis (CF3) of the second injection port (31c) and the center axis (CF1) of the fuel injector (30).

A fuel injector nozzle comprising at least two sets of injector orifices, each set of injector orifices including a first injector orifice and a second injector orifice, wherein the first injector orifice is parallel to the second injector orifice, and each set of injector orifices is angled relative to at least one other set of injector orifices.

An alignment device for a ducted fuel injection system comprising a mounting block removably attachable to a duct of the ducted fuel injection system. The mounting block can include a passageway extending therethrough. The passageway can align with the duct when the mounting block is attached to the duct. The alignment device further comprises an imaging device configured to capture an image viewing through the duct toward an outlet of a fuel injector. A portion of the imaging device can extend in the passageway. The alignment device additionally comprises a centering structure configured to align a portion of the imaging device with a central axis of the duct. The image captured by the imaging device can be configured for use aligning a position of an outlet of a fuel injector with respect to a position of the duct.

The present disclosure is intended to provide an internal combustion engine that can inhibit fuel from adhering to a piston and can reduce generation of soot. An internal combustion engine includes a piston, a cylinder accommodating the piston, and an injector including a nozzle that has a plurality of nozzle holes configured to inject fuel into the cylinder from above the cylinder. Among the plurality of nozzle holes, a sixth nozzle hole an axial direction of which is the most deflected toward the piston has a nozzle hole diameter larger than nozzle hole diameters of the other nozzle holes, and the nozzle hole diameter of the sixth nozzle hole corresponds to at least 20% of the total of the nozzle hole diameters of the other nozzle holes.

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.