Abstract: A method for adjusting the flow quantity in a fuel injector, that has an excitable actuation element, a valve-closure member that can be moved axially along a valve longitudinal axis, the valve-closure member, for the purpose of opening and closing the valve, cooperating with a fixed valve seat that is configured on a valve seat element, and a multilayer, or multiple-disk, perforated disk that is arranged downstream of the valve seat, is characterized by the fact that, in a first method step, the discharged fuel quantity of the opened fuel injector is measured and, in a second method step, a lower base layer of the perforated disk is deformed in the direction of the valve seat into a vacant flow-cross-section of the layer situated on top of it and, as a result, the vacant flow-cross-section within the perforated disk is changed until the actual quantity discharged corresponds to the predetermined setpoint quantity.

Abstract: In an injection hole plate of a fuel injection apparatus, a second-side hole section of each injection hole extends from a downstream end of a base wall of the injection hole plate and is communicated with first-side hole sections, which extends from an upstream end of the wall of the injection hole plate to an axially intermediate point of the wall. The first-side hole sections may discharge fuel into the second-side hole section in a manner that forms a swirl fuel flow in the second-side hole section. The injection hole plate may includes a collision portion, in which fuel flows supplied from the first-side hole sections collide with one another.

Abstract: A fuel injector for an internal combustion engine is disclosed. The fuel injector includes a housing, a valve seat, a metering orifice disc, and a needle. The housing has an inlet, an outlet, and a longitudinal axis extending therethrough. The valve seat is disposed proximate the outlet and includes a passage having a sealing surface and an orifice. The metering orifice disc is located at the outlet and has a plurality of metering openings extending therethrough. The needle is reciprocally located within the housing along the longitudinal axis between a first position wherein the needle is displaced from the valve seat, allowing fuel flow past the needle, and a second position wherein the needle is biased against the valve seat, precluding fuel flow past the needle. A generally annular channel is formed between the valve seat and the metering orifice disc. The channel tapers outwardly from a large height to a smaller height toward the orifice openings.

Abstract: A fuel injector (1) for fuel-injection systems of internal combustion engines includes an actuator (10), a valve needle (3), which is able to be activated by the actuator to actuate a valve-closure member (4), which, together with a valve-seat surface (6) formed at a valve-seat member (5), forms a sealing seat; and at least one spray-discharge orifice (7) which is formed in the valve-seat member (5). At a downstream end (42) of the fuel injector (1), a flameproofing screen (37) is positioned, which shields the spray-discharge orifices (7) from the combustion chamber of the internal combustion engine.

Abstract: A fuel injector (1) for fuel-injection systems of internal combustion engines includes a valve needle (3) cooperating with a valve-seat surface (6) to form a sealing seat; and an armature (20) engaging with the valve needle (3), the armature (20) being axially moveable at the valve needle (3) and being damped, via a damping element (32), which is located in a recess (35) in a downstream-side end face (34) of the armature (20), with respect to a cup-shaped sleeve (31) positioned downstream from the armature (20) and joined to the valve needle (3) in force-locking manner. Furthermore, the fuel injector includes a filter element (25b), the filter element (25b) being positioned downstream from the armature (20) in the cup-shaped sleeve (31).

Abstract: A fuel injector, in particular for direct injection of fuel into a combustion chamber of an internal combustion engine, having an actuator for actuating a valve needle, the valve needle having on one injection end a valve-closure member which forms a sealing seat together with a valve-seat surface formed on a valve-seat member. Fuel channels are provided in a valve needle guide which is designed in one piece with or is connected to the valve-seat member and they open into a swirl chamber. The number of fuel channels is such that a turbulent flow produced in the swirl chamber is homogeneous in a circumferential direction.

Abstract: A fuel injector, for example, a high-pressure injection valve for the direct injection of fuel into a combustion chamber of an internal combustion engine having external ignition, which is distinguished in that an outlet orifice is provided downstream from the valve seat which, at its downstream end, has a slot-forming element that largely closes off the outlet orifice. Between the outlet orifice and a front face of the valve-seat member, the slot-forming element leaves open a slot-shaped flow outlet, through which a fuel spray may be spray-discharged in a fan-jet pattern.

Abstract: The present invention relates to a fuel nozzle for use in an engine such as a gas turbine engine. The fuel nozzle includes a fuel injector for injecting fuel into a combustion chamber of the engine and a plurality of rows of holes surrounding the fuel injector for eliminating recirculation of hot gas products onto a face of the fuel nozzle. The holes eject air primarily in an axial direction.

Abstract: A fuel injector for an internal combustion engine is disclosed. The fuel injector includes a housing, a valve seat, a metering orifice, and a needle. The housing has an inlet, an outlet, and a longitudinal axis extending therethrough. The valve seat is disposed proximate the outlet and includes a passage having a sealing surface and an orifice. The metering orifice is located at the outlet and has a plurality of metering openings extending therethrough. The needle is reciprocally located within the housing along the longitudinal axis between a first position wherein the needle is displaced from the valve seat, allowing fuel flow past the needle, and a second position wherein the needle is biased against the valve seat, precluding fuel flow past the needle. A generally annular channel is formed between the valve seat and the metering orifice. The channel tapers outwardly from a large height to a smaller height toward the orifice openings.

Abstract: A fuel injector employed in a direct injection engine comprising a spark plug arranged on the top of a combustion chamber, a fuel injector located on said combustion chamber and an intake air control means installed on an intake manifold. A forward tumble air flow is formed in the combustion chamber by the intake air control means, and the fuel injector is available in two types; an annular (conical) spray type characterized by uniform density and a spray type characterized by high/low density. In the case of latter type, arrangement is made to ensure that the denser portion is placed face-to-face with the spark plug. Spray fuel rises along the wall surface of the combustion chamber on the intake side, and is carried to the spark plug by forward tumble air flow (called “tumble guide”) moving from the fuel injector to the spark plug.

Abstract: A thin film coating for a low alloy steel or tool steel components in a fuel injector (14), such as a fuel injector needle valve (86) is disclosed. A thin film coating (96) consists of a metal carbon material layer less than 2.0 microns thick applied to a low alloy steel substrate (95) or tool steel substrate (95) used in fuel injector components, such as the fuel injector needle valve (86) or a portion thereof. Optionally, a thin bond layer (98) of chromium is deposited between the steel substrate (95) and the primary metal carbon material coating (96). The thin film coating (96) minimizes abrasive and adhesive wear associated with the needle valve (86) and cooperating nozzle surfaces (62, 63) of the fuel injector (14).

Abstract: In a fuel injection device, a valve seat is formed on an inner peripheral surface of a valve body. The valve seat and a contacting portion of a needle form a sealing portion. Virtual perpendicular lines, which cross the sealing portion and are perpendicular to the inner peripheral surface of the valve body, intersect with each other at an intersecting point on a movable core side. The intersecting point is positioned between a first end of a guiding portion on a sealing portion side and a second end of the guiding portion opposite from the sealing portion. An end of the needle on a contacting portion side rotates around the intersecting point. Contact between the needle and the guiding portion is inhibited by positioning the intersecting point near the guiding portion.

Abstract: A fuel injection valve comprising a nozzle body (8) having a nozzle body seat (18), and a nozzle needle (2) is disclosed which is guided into the nozzle body (8) in a sealed manner and which comprises a nozzle needle shaft (6) and a nozzle needle seat (12). The nozzle body seat (18) and the nozzle needle seat (12) together form a sealed seat (20). A gap (28) is provided between the sealed seat (20) and the nozzle needle shaft (6). An outer surface (25) of the nozzle needle (2) extends in the region of the gap (28) essentially parallel to an inner surface (26) of the nozzle body (8).

Abstract: A fuel injector having an arrangement to stabilize the temperature of its components within an engine cylinder in a direct injection application. The fuel injector includes a body, an armature, a needle, a swirl generator, and a seat. The body has an inlet portion, an outlet portion, a body passage, extending from the inlet portion to the outlet portion along a longitudinal axis of the fuel injector. The armature is located proximate the inlet portion of the body, and is operatively connected to the needle. The needle is provided with a substantially uniform cross-sectional area, and the body is selected to surround the needle and form a body passage that has an average cross-sectional area less than two times the substantially uniform cross-sectional area of the needle.

Abstract: The invention relates to a valve having a valve needle (2) which is axially displaceable in a bore (5) of a valve body (3) and which on one end has a conical valve needle tip (4). The valve needle tip (4) includes a radial valve sealing face (9), which in the closing position of the valve comes to rest on a conical inner wall (6) of the valve body on the closed end of the bore (5). In the inner wall (6) of the valve body there is at least one opening (7), which connects the bore (5) with the outside (8) of the valve body (3). The valve includes two radial recesses (12, 13, 16, 17), which are disposed in the valve needle tip (4) or in the inner wall (6) of the valve body, and one of the radial recesses (13, 17) is located upstream (10) and the other radial recess (12, 16) is located downstream (11) from the position of the valve sealing face (9), in the closing position of the valve.

Abstract: A fluid injection nozzle (5) is mounted on a fluid injector valve (1) in order to control the flow of (and atomize) fluid passing through an injection hole (3b) of the fluid injector (1). The fluid injection nozzle (5) may include at least one nozzle hole (5a) that comprises an inlet hole (51a), an intermediate hole (52a) and an outlet hole (53a). These holes preferably serve to impart a step-wise control of the fluid flow exhausted from the injection hole (3b). The intermediate hole (52a) may have a longitudinal axis (L2) that extends substantially perpendicular toward a nozzle axis (L1). The intermediate hole (52a) may include a first terminal end that communicates with the inlet hole (51a) and a second terminal end that communicates with the outlet hole (53a). The intermediate hole (52a) preferably has a substantially uniform width (W) along substantially the entire length in the longitudinal axis (L2).

Abstract: A fuel injector including a body having an inlet, an outlet, and a fuel passageway extending from the inlet to the outlet along a longitudinal axis. An armature is proximate the inlet of the body. A needle is operatively connected to the armature. A seat is proximate the outlet of the body. A guide member is disposed within the body, the guide member including an aperture that guides the needle. A flat metering disk is disposed between the seat and the guide member, the flat metering disk including a central aperture, a perimeter, and a plurality of slots. Each of the plurality of slots is disposed about the central aperture and extends from the central aperture toward the perimeter to define a volume. The plurality of slots are configured so that the volumes of two of the plurality of slots are non-uniform, and/or the plurality of slots are non-uniformly disposed about the central aperture.

Abstract: A fuel injector includes a valve body and a valve seat positioned at a lower end of the valve body. A needle assembly is positioned within an inner bore of the valve body, the needle assembly including a needle body and an armature connected to an upper end of the needle body. A pair of guides are integrally formed with the valve body for guiding the needle assembly. The pair of guides includes an upper guide and a lower guide; the upper guide guiding the armature and the lower guide guiding the needle body.

Abstract: A fuel injector for fuel injection systems of internal combustion engines having a magnetic coil, a valve needle, which is in operative connection with the magnetic coil and acted upon in a closing direction by a restoring spring to actuate a valve-closure member, which, together with a valve-seat surface formed at a valve-seat member, forms a sealing seat; and having at least one spray-discharge orifice which is formed in the valve-seat member. The spray-discharge orifices discharge from elevations which project beyond an outer end face of the valve-seat member, the fuel being guided through flow channels in the elevations.

Abstract: A fuel injection valve to give the turn power around the center axis line of injection hole 17 to the fuel injected from the injection hole 17 by swirler 23. Center axis line E of injection hole 17 is inclined with respect to the center axis line C of said valve element by the fixed deflection angle &bgr;, and step difference 25 is formed on the pointed end of injection hole 17.

Abstract: A fuel injector, in particular an injector for fuel injection systems of internal combustion engines, has a first actuator which cooperates with a first valve needle. A first valve closing body situated on the first valve needle cooperates with a first valve seat surface to form a first sealing seat. A second actuator cooperates with a second valve needle, and a valve-closing body situated on the second valve needle cooperates with a second valve seat surface to form a second sealing seat.

Abstract: An injection nozzle with a blind bore is disclosed in which the transition between the blind bore and the nozzle needle seat is rounded. This decreases the tolerance in the flow resistance of the injection nozzle upon a partial stroke of the nozzle needle, and thus makes a more-precise control of the injected fuel quantity possible.

Abstract: A swirl disk is composed of at least one metallic material, and is configured as having at least one intake area and at least one outlet orifice, the at least one outlet orifice being introduced in a lower base layer, and having at least two swirl channels emptying into a swirl chamber, the swirl chamber being provided in a central swirl-producing layer. An upper layer is configured as a cover layer, which over its entire cross-sectional surface represents a closed layer without orifice contours. All the layers of the swirl disk are directly built up on top of each other using electroplating metal deposition (multilayer electroplating). The swirl disk is suitable for a use in a fuel injection valve, in particular in a high-pressure injection valve for directly injecting the fuel into a combustion chamber of a mixture-compressing, external-ignition internal combustion engine.

Abstract: A fuel injector (1), in particular for the direct injection of fuel into a combustion chamber of an internal combustion engine, includes a valve needle (3) at whose discharge-side end a valve-closure member (4) is positioned, which cooperates with a valve-seat surface (6), formed at a valve-seat member (5), to form a sealing seat. A spray-discharge orifice calotte (37, 41), connected to the valve-seat member (5) of the fuel injector (1), or integrally formed in one piece with it, has at least three spray-discharge orifices (38, 42), not all extended axes (39, 43) of the spray-discharge orifices (38, 42) intersecting.

Abstract: A fuel injector (1) for the direct injection of fuel into the combustion chamber of an internal combustion engine, having a valve needle (3), which is in operative connection with a valve-closure member (4), which forms a sealing seat with a valve-seat surface (6); and an armature (20), which is positioned on the valve needle (3) in an axially movable manner und cooperates with a magnetic coil (10). The armature (20) includes an armature casing (34) and an armature-stop sleeve (35), the armature-stop sleeve (35) being inserted into an inner opening (37) of the armature casing (34) in a form-fitting manner.

Abstract: A fuel injector (1) for fuel-injection systems of internal combustion engines has a solenoid coil (10); a valve needle (3) that is operatively connected to the solenoid coil (10) and acted upon by a restoring spring (23) in a closing direction, in order to actuate a valve-closure member (4) which, together with a valve-seat surface (6) formed at a valve-seat member (5), forms a sealing seat; and at least two spray-discharge orifices (7) which are formed in the valve-seat member (5). The spray-discharge orifices (7) are formed in the valve-seat member (5) in such a way that they are shielded from mixture flows circulating in a combustion chamber of the internal combustion engine.

Abstract: A system for assisting in the atomisation of liquid particles conveyed in a gas stream flowing along a flow path having a rigid boundary, said system involving the creation of one or more shock waves in the gas stream. In a preferred embodiment, the system comprises a fuel injection nozzle (10) comprising a fluid flow passage (43) terminating at a discharge orifice (15) and incorporating a delivery port (33) defined between a valve seat (31) and a valve member (23) movable with respect to the valve seat for opening and closing the delivery port. Fuel is delivered along the fluid flow passage (43) into a combustion chamber through the discharge orifice (15) upon opening of the delivery port (33). The valve member (23) devines an inner boundary surface (47) of the flow passage (43) and the valve seat (31) defines at least part of an outer boundary surface (45) of the flow passage (43).

Abstract: A fuel injector includes a homogenous charge nozzle outlet set and a conventional nozzle outlet set controlled respectively, by first and second needle valve members. The homogeneous charged nozzle outlet set is defined by a nozzle insert that is attached to an injector body, which defines the conventional nozzle outlet set. The nozzle insert is a one piece metallic component with a large diameter segment separated from a small diameter segment by an annular engagement surface. One of the needle valve members is guided on an outer surface of the nozzle insert, and the nozzle insert has an interference fit attachment to the injector body.

Abstract: It is an object of the invention to provide a method of working an injection hole of an electromagnetic type fuel injection valve so that when extrusion by using a punch is adopted, the punch does not break, even in the case where a central axis line of the injection hole of the electromagnetic type fuel injection valve is inclined to a line perpendicular to a face of a plate-like material to be punched. A front end, tapered portion of the punch is inclined in a direction opposed to a plate-like material relative to a central axis line of the punch to facilitate the punch along a sliding, inner face of a punch holder. While achieving a reduction in production cost, the divergent-shaped injection hole can accurately be formed in the plate-like material. A side force (Fs) is produced when the front end portion of the punch impinges on the plate-like material.

Abstract: At an outlet portion of an injection hole (8) of a fuel injection valve (1), through removal of a part (A1, 7B) of a wall forming the injection hole (8), a restriction to a spray flow is released, thereby, a deflection spray is formed in which the spray is rich at the side of restriction released and is learn at the side of restricted, accordingly, ignition property of an internal combustion engine is improved, and an optimum spray is realized which reduces exhaust amount of unburnt gas components.

Abstract: The present invention provides a GDI injector of a vehicle engine that can change the level of swirl motion and make it possible to increase engine output and fuel mileage, comprising a nozzle body having an opening along its longitudinal axis, a fuel inlet member, a cylindrically-shaped needle valve being centrally located within the opening of the nozzle body, and a swirl generator, the swirl generator comprising: an inner case having a cylindrically-shaped body and a plurality of equally and angularly spaced lobes, the inner case being coupled to the needle; an outer case having a cylindrically-shaped body and a plurality of equally and angularly spaced grooves, the outer case being fixedly attached to the nozzle body; and an inner case rotator.

Abstract: The invention relates to a fuel injector having an orifice region in which an orifice passage extends along an injector axis and ends at an orifice edge. The fuel injector is characterized in that the orifice edge is rotationally asymmetrical about the injector axis.

Abstract: A fuel injector that allows spray targeting and distribution of fuel to be configured using non-angled or straight orifice having an axis parallel to a longitudinal axis of a valve subassembly. Metering orifices are located about the longitudinal axis and defining a first virtual circle greater than a second virtual circle defined by a projection of the sealing surface onto the metering disc so that all of the metering orifices are disposed outside the second virtual circle. The projection of the sealing surface converges at a virtual apex disposed within the metering disc. At least one channel extends between a first end and second end. The first end is disposed at a first radius from the longitudinal axis and spaced at a first distance from the metering disc.

Abstract: A fuel injector that allows spray targeting and distribution of fuel to be configured using non-angled or straight orifice having an axis parallel to a longitudinal axis of the subassembly. Metering orifices are located about the longitudinal axis and defining a first virtual circle greater than a second virtual circle defined by a projection of the sealing surface onto the metering disc so that all of the metering orifices are disposed outside the second virtual circle. The projection of the sealing surface converges at a virtual apex disposed within the metering disc. At least one channel extends between a first end and second end. The first end is disposed at a first radius from the longitudinal axis and spaced at a first distance from the metering disc.

Abstract: The present invention comprises a nozzle type atomizer with two or more aligned “horn” stages. The definition of a “horn” stage is well known in the prior art as an effectively half wavelength length and a tapering shape with a central conduit. The present invention uses two to five, or more, horn stages integrally attached end to end. The dramatic improvement in amplitude of the vibration at the tip of the nozzle is without precedence in the prior art. The present invention makes application of transducer vibration at greater than 200 kHz possible. The present invention reduces the required applied energy for generating the necessary amplitude at the tip by the discovery of amplitude multiplication with two or more horn stages.

Abstract: An orifice plate 21 is attached at the tip of an injector 1 to cover a fuel passage hole 18. The orifice plate 21 is provided with a plurality of orifices 24 for allowing fuel having passed through the fuel passage hole 18 to be injected. The orifice plate 21 includes a plate body 23 constructed in layers, and each orifice 24 is constructed of a plurality of holes 27a-27d each formed in each layer of the plate body 23 so that each hole is perpendicular to a surface of the plate body 23, the holes being disposed in communication with each other and with displacements from each other along a line obliquely intersecting the plate body.

Abstract: A fuel swirler plate for improving atomization of fuel in a fuel injector. A plurality of identical fuel supply passages is formed in the plate, each passage including an outer fuel reservoir region; a region having converging walls wherein fuel is accelerated and turned partially tangential to the axis of the plate and fuel injector; a metering region wherein flow is regulated; and an exit region wherein the fuel is combined with similar fuel flows from the other passages to form a high velocity swirl annulus between the swirler plate and a pintle ball of the fuel injector. An advantage of the novel swirl plate over prior art plates is that, when the injector valve is closed, only a very small volume of fuel resides in the swirl annulus between the pintle ball and the exit region of the plate, and such residual fuel is urged rotationally and becomes the leading edge of a new vortex the next time the valve is opened, thus minimizing SAC spray formation.

Abstract: The nozzle has a conical wall with injection orifices; the pin has a tip activated by an axial force to engage the wall and close the orifices; the tip has a truncated-cone-shaped portion having an outer surface which rests entirely on the wall, possibly as a result of elastic deformation of the outer surface; and the outer surface forms with the wall a substantially zero angle with a tolerance of 0′ to ±10′.

Abstract: In a fuel injector with a swirler creating swirling fuel flow, a projected portion is formed as an orifice nozzle tip at an opening end of a nozzle hole. The projected portion includes a first sloped portion having a sloped surface whose height h1, measured in the orifice-axis direction, is dimensioned to gradually increase along the swirling-fuel-flow direction, and a second sloped portion having a sloped surface whose height h2, measured in the orifice-axis direction, is dimensioned to gradually decrease along the swirling-fuel-flow direction. In a &thgr;-h coordinate system constructed by a &thgr;-axis representing the angular position of the orifice nozzle tip and a h-axis representing the axial height of the projected portion, the projected portion is dimensioned so that the absolute value |dh1/d&thgr;|max of the gradient of the first sloped surface is dimensioned to be less than the absolute value |dh2/d&thgr;|max of the gradient of the second sloped surface.

Abstract: A fuel injector for a spark ignition direct injection engine includes an injection having plurality of spray holes formed in a generally semicircular pattern wherein the spray holes have a L/D (length over diameter) ratio of not more than 2.0. In a preferred embodiment, the injector nozzle has an internal sac and an end wall with part spherical inner and outer surfaces formed with a common center, the pattern of the spray holes includes a semicircle formed by an arc having ends connected by a straight line wherein the spray holes have outlet openings that are spaced along the arc and slightly below the straight line, and the spray holes lying on the semicircle extend from the common center while the spray holes lying below the straight line have axes extending from above the common center. In an engine, the flat side of the spray is aimed toward the near side of a piston bowl recess.

Abstract: A fuel injection valve of an internal combustion engine for a vehicle is comprised of a nozzle plate which has a plurality of nozzle holes. Fuel injection jets are injected from the nozzle holes and collided with each other. The thickness of the nozzle plate is equal to or greater than the diameter of the nozzle holes.

Abstract: A fuel injection system for internal combustion engines has at least one fuel injector which injects fuel into a combustion chamber with a spark plug projecting into the combustion chamber. The fuel injector has a valve body which has a plurality of injection holes situated on the circumference. The injection holes are designed so that a conical spray jet is produced in the combustion chamber. At least the injection holes situated directly on both sides of the spark plug have an elongated cross section.

Abstract: A fuel injection nozzle for self-igniting internal combustion engines, having a nozzle body in which a conical valve seat face is formed on the injection end of a bore, from which face the injection ports extend, and having a valve needle, opening counter to a closing force counter to the flow direction of the fuel, which needle is guided displaceably in the entrance region of the bore remote from the injection end and which on its side toward the valve seat face has a closing cone, which cooperates with the valve seat face, is characterized in that the injection port cross section toward the combustion chamber of the engine, after initially narrowing, widens again.

Abstract: A fuel injector, in particular for a high-pressure injector for direct injection of fuel into a combustion chamber of an internal combustion engine, has compression of a fuel/air mixture with spark ignition. On the downstream end of the valve a valve seat element (26) is provided, to which a perforated disk (70) acting as a flow restrictor is connected downstream. A swirl element (47) is situated upstream from the valve seat (27) which imparts an atomization-promoting rotational motion to the fuel to be injected. In the valve seat element (26) downstream from the valve seat (27) an elongated outlet orifice (32) is provided which opens directly into an orifice (73) in the perforated disk (70) attached to the valve seat element (26). The width of the outlet orifice (32) is greater than the width of the orifice (73), at least at its narrowest location, so that it is possible to adjust the steady-state flow rate of the valve at the orifice (73).

Abstract: An engine fuel injector includes an internal fuel passage in which pressure waves can develop upon opening and closing of an injection valve. A fuel pressure damper is associated with the fuel passage and operates to vary the internal volume of the fuel passage in a manner to reduce the amplitude of pressure variations and pressure waves in the fuel passage. A variety of fuel pressure damper embodiments are disclosed.

Abstract: A technique is provided for enhancing fluid flow in an outwardly opening nozzle assembly. A flow enhancement assembly is provided adjacent an exit from an outwardly opening poppet to provide desired spray characteristics. The flow enhancement assembly includes converging and diverging passages and a plurality of ports to form a spray.

Abstract: An injector nozzle for a fuel injected internal combustion engine, said injector nozzle including a port (5) having an internal valve seat surface (15) and a valve member (13) having an external seating surface (17), said valve member being movable relative to the port to respectively provide a passage between the valve seat surface and the external seating surface for the delivery of fuel therethrough or sealed contact therebetween to prevent said delivery of fuel, the port further including an outer port surface (16) surrounding and located adjacent the valve seat surface and external to the port, wherein the angle between the valve seat surface and the outer port surface of the port is less than 90 degrees.

Abstract: A fuel injector having an orifice plate proximate the outlet. The orifice plate has first and second plate surfaces spaced at a predetermined distance from one another and an orifice, the orifice extending along a longitudinal axis and includes a first surface and a second surface being spaced from the first surface. The first surface includes a first region having a first surface characteristic being oriented in a first direction oblique to the longitudinal axis. The second surface includes a second region having second surface characteristic being oriented in a second direction oblique to longitudinal axis. The fuel injector has a housing extending a longitudinal axis. The housing includes an inlet, an outlet and a passageway disposed between the inlet and the outlet.

Abstract: A fuel injector comprising an outer valve needle provided with a bore, an inner valve needle slidable within the bore, the outer and inner valve needles being engageable with first and second seatings respectively to control the supply of fuel from the fuel injector. The inner valve needle includes a passage which communicates with a sac chamber located downstream of the second seating, whereby movement of the outer valve needle away from the first seating causes fuel to flow through the passage into the sac chamber such that fuel pressure within the sac chamber causes the inner valve needle to lift away from the second seating.

Abstract: A fuel injector has a chamber between a valve body and a plate in which a plurality of through holes are formed. The chamber has a diameter larger than that of an opening of the valve body. The through holes are opened at an outer chamber area shaded by the valve body are distanced from an outer wall of the chamber more than a diameter of the through hole. Fuel flowing along an inner inclined surface of the valve body turns to the through holes and flows into the through hole from all directions and collides with each other at inlets of the through hole. Therefore, injected fuel has a lot of turbulences and is finely atomized.