A liquid fuel injector such as for a dual fuel system in an internal combustion engine includes two-way injection control valves for controlling twin outlet checks. A first set of orifices are arranged in an A-F-Z pattern, and a second set of orifices are arranged in an A-F-Z pattern, within the fuel injector, among a high-pressure inlet passage, a low-pressure space, and first and second outlet check control chambers, respectively. A common nozzle supply cavity is fluidly connected to the high-pressure inlet passage and supplies each of two sets of nozzle outlets opened and closed by the twin outlet checks.

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.

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.

A fuel injector includes an injector housing having a nozzle assembly with a nozzle piece, and a nested check assembly of an outer check and an inner check. Spray orifices are formed in the nozzle piece in a first orifice set equipped with a first spray duct set and a second orifice set equipped with a second spray duct set. The inner check can be opened to spray fuel from the first orifice set and the outer check can be opened to spray fuel from both the first orifice set and the second orifice set. The outer check is non-rotating while the inner check can be permitted to rotate during service. Spray ducts associated with the first orifice set may have a different duct length and duct inside diameter than spray ducts associated with the second orifice set. The first orifice set may include lower-flow spray orifices and the second orifice set may include higher-flow spray orifices. Related methodology is also disclosed.

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.

An electronic fuel injection type diesel engine enables reduction in engine size. The electronic fuel injection type diesel engine is provided with: a combustion chamber inside a cylinder; a fuel injection chamber inside a cylinder head; a fuel injector that injects liquid fuel into the fuel injection chamber; a fuel accumulation unit that accumulates the liquid fuel injected from the fuel injector; and an electronic control unit that controls a timing and an amount of injection of the liquid fuel.

A fuel nozzle for a combustor includes a fuel body, a primary fuel passage having a primary fuel outlet, and a secondary fuel passage having a secondary fuel outlet, the secondary fuel passage being non-concentric with the primary fuel passage. The primary fuel outlet and the secondary fuel outlet are non-parallel. An axial centerline of the primary fuel outlet is angled with respect to an axial centerline of the primary fuel passage and an axial centerline of the secondary fuel outlet is colinear with an axial centerline of the secondary fuel passage. Also provided is a method of introducing non-concentric, non-parallel fuel flows to a combustor is also provided.

An opening intersection point is between a nozzle hole axis and an inlet opening portion. A normal line of a suction wall surface at the opening intersection point intersects a nozzle hole inner wall or an imaginary inner wall which is an extension of the nozzle hole inner wall. A distance from an outlet opening portion to an inner wall intersection point, which is an intersection point between the normal line and the nozzle hole inner wall or the imaginary inner wall, is LA. An nozzle hole length between the inlet opening portion and the outlet opening portion of the nozzle hole inner wall on a side where the inner wall intersection point is formed is LB. The nozzle hole is provided such that LA/LB>−0.2.

At least one of nozzle holes is provided as a non-circular nozzle hole where the ratio of the longest diameter to the shortest diameter of an outlet opening portion is greater than 1. A virtual non-circular cone and a virtual circular cone are defined for each of the non-circular nozzle hole and a circular nozzle hole where the ratio of the longest diameter to the shortest diameter of the outlet opening portion is 1. At least two adjacent nozzle holes are formed such that the virtual non-circular cone does not interfere with the virtual circular cone or the virtual non-circular cone.