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.

Systems and methods are provided for operation of fuel injectors within an applied-ignition, direct-injection internal combustion engine. In one example, a needle of a fuel injector is moved from a retracted position to an extended position relative to a plurality of injection holes of a nozzle of the fuel injector, with at least one injection hole being separated from a fuel supply system earlier than each other injection hole. In a partially retracted position, fuel flow along a first side of the needle is decreased relative to fuel flow along a second side of the needle.

An injection hole of a fuel injector includes: an inner hole section extending from an inner surface of a bottom wall of an injector tip obliquely away from a first side relative to a normal line of the inner surface to define a first inner side wall surface on the first side forming an obtuse angle with the inner surface and a second inner side wall surface on a second side opposite to the first side forming an acute angle with the inner surface; a middle hole section including a first middle side wall surface extending obliquely from the first inner side wall surface toward the first side; and an outer hole section including a first outer side wall surface extending obliquely from the first middle side wall surface toward the first side. A recess is formed on a radially outer side of an inner end of the inner hole section.

A fuel injection valve includes a valve housing having an injection hole and a valve seat surface tapering toward a downstream side, a valve component that is accommodated in the valve housing and is coaxially separated from or seated on the valve seat surface, and an elastic component biasing the valve component toward the valve seat surface. The valve component includes an inner convex surface curved in a partial spherical shape with a predetermined curvature radius, and an outer convex surface that is provided continuously to the outer peripheral side of the inner convex surface and curved in a partial spherical shape having a smaller curvature radius than the inner convex surface. A boundary portion between the inner convex surface and the outer convex surface protrudes toward the valve seat surface so as to be able to be separated from or seated on the valve seat surface.

A valve assembly for a fluid injector for an internal combustion engine includes a valve body with a valve recess, a central longitudinal axis, and a first axial end and a second axial end with respect to the central longitudinal axis. A valve needle is axially moveable within the valve recess with respect to the central longitudinal axis. In concurrence with a seal seat area the valve needle prevents a fluid flow through at least one flow hole in its closing position and otherwise enables it. Furthermore, the injector comprises a sac volume step adjacent to the seal seat area forming a part of an inner surface of a wall of the valve body and a sac volume being designed as one end of the valve recess and being limited by a further part of the inner surface of the wall of the valve body.

An injection hole of a fuel injector includes: an inner hole section extending from an inner surface of a bottom wall of an injector tip obliquely away from a first side relative to a normal line of the inner surface to define a first inner side wall surface on the first side forming an obtuse angle with the inner surface and a second inner side wall surface on a second side opposite to the first side forming an acute angle with the inner surface; a middle hole section including a first middle side wall surface extending obliquely from the first inner side wall surface toward the first side; and an outer hole section including a first outer side wall surface extending obliquely from the first middle side wall surface toward the first side. A recess is formed on a radially outer side of an inner end of the inner hole section.

A valve device includes a valve housing having a hole and a seat provided on a periphery of the hole, a tubular member, a valve member opening the hole when moving away from the seat and closing the hole when being in contact with the seat, an urging member urging the valve member in a valve closing direction or a valve opening direction, an intermediate member being immovably relative to the tubular member, an adjusting member having a communication passage and configured to adjust an urging force of the urging member via the intermediate member according to a position relative to the tubular member when fixed to the tubular member, and a swelling member provided between the intermediate member and the tubular member and configured to be in contact with the intermediate member and the tubular member by swelling when touched with a fluid flowing through the hole.

A solenoid valve for controlling fluids includes: a closing element, which opens and closes at least one outlet opening on a valve seat; a magnetic circuit having an armature, an internal pole and a magnetic return path; and a coil. The armature is connected to the closing element. The magnetic circuit includes (i) a nonmagnetic separating element for interrupting the magnetic circuit and (ii) a magnetic choke device closing the magnetic circuit on the nonmagnetic separating element, which magnetic choke device is a separate individual component which is fixed using a form-locking and/or a force-locking connection.

When injection-hole inlets and injection-hole outlets are projected vertically onto an X-Y plane (N) perpendicular to a valve-seat axial center, an injection-hole arrangement angle (), which is formed by a straight line (a) passing through a center of the injection-hole inlet of a reference injection hole and the valve-seat axial center and a straight line (b) passing through a center of the injection-hole inlet of the injection hole neighboring the reference injection hole and the valve-seat axial center on the plane (N), is set so as to become smaller as being closer to a Y-axis. A fuel turn angle () on a wide-angle side, which is formed by the straight line (a) and a straight line (c) passing through a center of the injection-hole inlet and a center of the injection-hole outlet on the plane (N), has a relationship: 90<<180.

Systems and methods are provided for operation of fuel injectors within an applied-ignition, direct-injection internal combustion engine. In one example, a needle of a fuel injector is moved from a retracted position to an extended position relative to a plurality of injection holes of a nozzle of the fuel injector, with at least one injection hole being separated from a fuel supply system earlier than each other injection hole. In a partially retracted position, fuel flow along a first side of the needle is decreased relative to fuel flow along a second side of the needle.