Abstract: An electronically-controlled fuel injector includes a pressurized fluid chamber that communicates high pressure fluid to first and second pressure control chambers. A direct-operated check moves between closed and open positions in response to a difference in fluid pressure in the first and second pressure control chambers. A thermally pre-stressed bender actuator is used to operate a control valve that controls the fluid pressure in the first pressure control chamber to effectively control opening and closing of the check during portions of an injection sequence.

Abstract: An electromagnetic fuel injection valve includes a valve housing coupled to at one end thereof to a valve seat member; a stationary core coupled to the other end of the valve housing; and a valve assembly comprised of a movable core slidably accommodated in the valve housing, and a valve member connected to the movable core through a rod portion and adapted to cooperate with the valve seat. In the electromagnetic fuel injection valve, the valve housing is provided with a guide portion on which the valve assembly is axially slidably carried, and a high-hardness coating of diamond-like carbon including silicon is formed on an outer peripheral surface of the valve assembly contacting with the guide portion. The surface roughness Rmax of the high-hardness coating is set in a range of 0.05 to 0.2 ?m.

Abstract: An injection device for a fuel reservoir injection system is proposed, having an injection nozzle (16), which protrudes into a combustion chamber and can be supplied with fuel from a high-pressure fuel distributor (10) by means of a high-pressure fuel supply path (14, 52, 44, 40), and having a nozzle needle (30), which opens and closes this injection nozzle (16) as a function of the pressure in a control chamber (58). In order to introduce fuel into the control chamber, an inlet conduit (62), which branches from the fuel supply path, feeds into this control chamber (58) and an outlet path (66, 78), which leads from this control chamber (58), permits fuel to flow out of the control chamber. A shutoff valve (70) can close a downstream section (66″) off from an upstream section (66′) of the outlet path. The downstream section and the upstream section of the outlet path feed into a valve chamber (78), which contains a movable shutoff element (76).

Abstract: A fuel injector for use with an internal combustion engine. The fuel injector comprises a valve group subassembly and a coil group subassembly. The valve group subassembly includes a tube assembly having a longitudinal axis that extends between a first end and a second end; a seat that is secured at the second end of the tube assembly and that defines an opening; an armature assembly that is disposed within the tube assembly; a member that biases the armature assembly toward the seat; an adjusting tube that is disposed in the tube assembly and that engages the member for adjusting a biasing force of the member; a filter that is at least within the tube assembly; and a first attachment portion. The coil group subassembly includes a solenoid coil that is operable to displace the armature assembly with respect to the seat; and a second attachment portion that is fixedly connected to the first attachment portion.

Abstract: A fuel injector is described having a movable valve part, which for opening and closing of the valve cooperates with a stationary valve seat which is formed on a valve seat element. A swirl disk is arranged downstream from the valve seat and has a multilayer configuration. The fuel flowing through is imparted to a swirl component between at least one inlet area and at least one outlet area. In a first swirl-generating plane a swirl component is imparted to a first portion of the flow, while a second portion of the flow without swirl and independent of the first swirling portion of the flow is routed inside the swirl disk, and in a second swirl-generating plane a swirl component is imparted only to the second portion of the flow. The fuel injector may be suitable for direct injection of fuel into a combustion chamber of an internal combustion engine having compression of a fuel/air mixture with spark ignition.

Abstract: A method of manufacturing a fuel injector is disclosed. The method includes assembling a power group assembly with a valve group assembly to form the fuel injector. The power group assembly includes an overmold formed over a coil assembly. The valve group assembly includes a tube assembly formed by connecting an inlet tube to a valve body. The valve body includes a seat, a lower guide, and an armature/ball assembly disposed within the valve body. A retention member can be used to retain the power group assembly to the valve group assembly.

Abstract: Poppets for fuel injectors are provided with an improved sealing surface by making the poppet from a softer material than is known in the prior art. Instead of providing a Rockwell C hardness value of 50 or greater, as is known to those skilled in the art of poppet manufacture, the improved poppet is made of a softer material that allows the valve head of the poppet to wear in such a way that its shape conforms more accurately with a valve seat of the nozzle of a fuel injector. This also provides the beneficial result of improved salt water corrosion resistance. By using a softer metal to make the poppet, the improved sealing characteristic improves fuel efficiency of the engine and reduces emissions of undesirable compounds.

Abstract: A fuel injector, especially a fuel injector for injection systems of internal combustion engines, includes a solenoid which works together with an armature and a valve needle to actuate a valve-closure member, which together with a valve-seat surface forms a sealing seat. A longitudinal axis of the valve needle is inclined by a prescribed angle with respect to a longitudinal axis of a valve housing. The armature is linked with an actuating body whose longitudinal axis is inclined with respect to the longitudinal axis of the valve needle and which acts on the valve needle through a hydraulic device.

Abstract: In an electronic fuel injector used in a combustion system using gas fuel, the present invention suppresses wearing of worn portions to make control of stable supply of gas fuel possible by forming a surface reforming layer (nitrided layer etc.) having wear resistance on a surface of a structural material of worn portions of the electronic fuel injector.

Abstract: An electromagnetic fuel injection valve wherein a central pipe part has satisfactory mechanical strength and an intermediate portion of the pipe part is surely made non-magnetic is provided. The electromagnetic fuel injection valve has a core surrounded by a solenoid coil. A valve housing is disposed forward of the core. The core and the valve housing are connected through a thin-walled portion. The wall thickness of the thin-walled portion is smaller than the wall thickness of the core and that of the valve housing. The core and the thin-walled portion, together with the valve housing, are formed in an integral structure. The thin-walled portion has a sufficient wall thickness to provide satisfactory mechanical strength. The thin-walled portion is modified into a high-hardness non-magnetic portion by a carbulizing treatment.

Abstract: A control apparatus for a unit fuel injector, the injector internally preparing fuel during an injection event at a pressure sufficient for injection into an internal combustion engine by means of an intensifier piston includes a selectively actuatable controller being in fluid communication with a source of pressurized actuating fluid and being in fluid communication with a substantially ambient actuating fluid reservoir, the controller having a first valve for selectively independently porting actuating fluid to and venting actuating fluid from the intensifier piston and a second valve for selectively independently porting actuating fluid to and venting actuating fluid from a needle valve during the injection event for controlling opening and closing of the needle valve. The control apparatus may also control an engine intake/exhaust valve. An engine valve actuator and methods of control are further included.

Abstract: An injection device satisfies the following conditions: 5 mm≦La≦10 mm, 0 mm≦Lb≦1.0 mm, Lb≦Lc, and 0.5≦Ld/La ≦1.5, wherein La is a length of a coil, Lb is a distance between a downstream end surface of the coil and a downstream end surface of a non-magnetic portion, Lc is a distance between the end surface of the coil and a downstream end surface of a stationary core (or stationary portion), Ld is a length of the non-magnetic portion. The device also satisfies the following conditions: 0.2≦Sb/Sa≦0.9, and 0.1≦(Lf+Lc)/La≦1.0, wherein Sa is a cross-sectional area of a main portion, Sb is a cross-sectional area of a reduced size portion, Lf is a length of the reduced size portion.

Abstract: An injection device satisfies the following conditions: 5 mm≦La≦10 mm, 0 mm≦Lb≦1.0 mm, Lb<Lc, and 0.5 ≦Ld/La ≦1.5, wherein La is a length of a coil, Lb is a distance between a downstream end surface of the coil and a downstream end surface of a non-magnetic portion, Lc is a distance between the end surface of the coil and a downstream end surface of a stationary core (or stationary portion), Ld is a length of the non-magnetic portion. The device also satisfies the following conditions: 0.2≦Sb/Sa≦0.9, and 0.1≦(Lf+Lc)/La≦1.0, wherein Sa is a cross-sectional area of a main portion, Sb is a cross-sectional area of a reduced size portion, Lf is a length of the reduced size portion.

Abstract: The invention relates to an injector for injecting a fluid under high pressure by means of a nozzle. The injector element includes a high pressure inlet line as well as a pressureless outlet. The injector element is connected with a common high pressure collection space (common rail) and contains a solenoid valve which serves to actuate the nozzle. An axially extending casing is movably accommodated in the injector element, the one face of which is actuatable by means of a valve and the other face of which bounds a control space in which a branch of a high pressure inlet opens.

Abstract: A fuel injection valve includes a housing in which a pistonlike valve member is disposed longitudinally displaceably in a bore to cause at least one injection opening to communicate with a pressure chamber embodied in the housing. An inlet conduit discharges into the pressure chamber to fill the pressure chamber with fuel at high pressure. A fuel-filled control chamber in the housing at least indirectly exerts a force acting in the closing direction on the valve member. The control chamber communicates with the inlet conduit and can be made to communicate via a control valve with a leak fuel chamber. A damping chamber communicates with the inlet conduit via a throttle.

Abstract: For each cylinder of the internal combustion engine, the fuel injection system has one high-pressure fuel pump and one fuel injection valve communicating with it. A first pump piston of the high-pressure fuel pump defines a pump work chamber, which communicates with a pressure chamber of the fuel injection valve; the fuel injection valve has an injection valve member, by which injection openings are controlled, and which is movable by the pressure prevailing in the pressure chamber in an opening direction counter to a closing force. The high-pressure fuel pump has a second pump piston, which defines a work chamber, and on which, after an initial pumping stroke, the first pump piston comes to rest, so that the second pump piston likewise executes a pumping stroke.

Abstract: A valve structure which works easily, does not increase production cost, can reduce dispersion in a side gap by restricting eccentricity and incline of a valve body and can maintain highly accurate injection. An electromagnetic fuel injection valve is required which is easy to manufacture even in a narrow valve structure. A guide portion is provided having one end fixed to an injection valve main body for guiding the valve member. A nozzle guide body constituting a magnetic passage portion to surround a magnetic member connected and fixed to one end of the valve member by the same material is provided. Accordingly, it is possible to reduce dispersion of a side gap constituting the magnetic passage, and it is also possible to stabilize an axial motion of the valve member, whereby high injection accuracy is maintained and an inexpensive injection valve is obtained.

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: A fuel injector includes an armature and a core, which interact with a solenoid coil, a valve needle, which is connected to the armature, seat together with a valve-seat member, and an adjustment sleeve for prestressing a restoring spring, the adjustment sleeve being situated in a central opening of the fuel injector and having an axial slot. The adjustment sleeve, on the inflow side, overlaps a step formed in the central opening. On the inflow side of the step, a gap is formed between the adjustment sleeve and a wall of the central opening. The adjustment sleeve has at least one cutout at an inflow-side end.

Abstract: In a fuel injection valve having a housing pipe, a valve movable reciprocatingly and axially inside the housing pipe, and a body valve having a bottom wall constituting a valve seat with which the valve comes in contact and a side wall whose axial end is connected to a circumferential periphery of the bottom wall and whose the other axial end is fitted to and heat bonded to an end of the housing pipe, the side wall is provided on an outer circumference thereof with a ring shaped groove that is formed in advance before the body valve and the housing pipe are heat bonded to each other and serves to prevent a deformation of the side wall due to heat generated by the heat bonding from being transmitted straight to the valve seat.

Abstract: A fuel injector for controlling fuel flow to an internal combustion engine and a method of setting dynamic calibration for the fuel injector. The fuel injector has a body, a seat, an armature assembly, a resilient member, and a member. The member extends parallel to the longitudinal axis between a first portion and a second portion. The first portion supports the resilient member and engages the body, and the second portion has a filter. The method can be achieved, in part, by providing the member extending between the first portion and the second portion, fixing the filter to the second portion, moving the member along the longitudinal axis with respect to the body; and engaging the first portion with respect to the body such that the first portion supports the resilient member in a predetermined dynamic state.

Abstract: An electromagnetic injector for controlling a fuel quantity to be fed into an internal combustion engine includes a valve body displaceable by an electromagnetic coil system, the valve body acting together with a magnet armature of the electromagnetic coil system. The electromagnetic coil system includes at least two concentrically positioned coils integrated into the magnetic circuit so that in each case a first pole body is positioned between two adjacent coils, and the inner and outer coil are respectively adjacent to a second pole body, the first and second pole bodies are components of the magnetic circuit of the electromagnetic coil system, and in each case adjacent coils may have a common field current flowing through them in opposite directional sense to each other.

Abstract: A fuel injector and a method of setting dynamic calibration for the fuel injector. The fuel injector has a body, a seat, an armature assembly, a resilient member, and a member. The resilient member biases the armature assembly toward the second position. And the member extends parallel to the longitudinal axis between a first portion and a second portion. The first portion supports the resilient member and engages the body, and the second portion has a filter. The method can be achieved, in part, by providing the member extending between the first portion and the second portion, fixing the filter to the second portion such that the filter extends toward from the first portion, moving the member along the longitudinal axis with respect to the body; and engaging the first portion with respect to the body such that the first portion supports the resilient member in a predetermined dynamic state.

Abstract: A top-feed electronic fuel injector for an internal combustion engine includes an injector body having a valve seat disposed opposite a generally cylindrical bore of nominal inner diameter defined within the injector body. A needle valve moves within the passage between a closed position against the valve seat, as urged by a coil spring disposed within the bore, and an open position away from the valve seat. The coil spring is seated against an end face a spring adjustment tube that is pressed into the bore. The spring adjustment tube, which is formed of rolled sheet stock to provide a “spiral-wound” configuration featuring at least 1.5 turns, end-to-end, when the spring adjustment tube is viewed in a transverse section, resiliently presses against the walls of the bore to maintain its position and, hence, calibrate the spring force applied to the needle valve.

Abstract: To supply a method that enables the inclination of the injection direction and the distribution of the penetration force of spray to be adjusted over a wide range, and an axially symmetrical spray shape to be obtained even when the injection hole is inclined, or the shape of the spray to be changed without inclining the injection hole. To provide a fuel passageway 203 as a swirling force adjustment means between the valve seat 201 and injection hole 101 of the fuel injector. This swirling force adjustment means adjusts the distribution of the swirling force of the fuel flowing into injection hole 101, and thus adjusts the spray shape obtained as a result.

Abstract: In a fuel injector, a valve member in a hollow cylindrical shape having a bottom is enclosed and supported in a magnetic cylinder defining a fuel passage to reciprocate in an axial direction. At least two of the ceramic heaters having an arc shape in cross section are arranged on the outer periphery of the magnetic cylinder in a circumferential direction to be a cylindrical shape. The ceramic heaters are pressed toward the outer periphery of the magnetic cylinder by a heater holder with a small resiliency. The ceramic heaters are tightly fitted on the outer peripheral surface of the magnetic cylinder without being damaged. Therefore, heat of the ceramic heaters is conducted to the magnetic cylinder and fuel in the magnetic cylinder is effectively heated.

Abstract: A solenoid valve is provided which may be used to inject fuel into an internal combustion engine for automotive vehicles. The solenoid valve is designed to keep an air gap between a stator and an armature at a constant interval required to ensure a normal operation of the solenoid valve. The solenoid valve includes a spacer which is provided between the stator and the armature to keep the air gap without any hit of the armature on the stator. In one embodiment, the spacer is installed on a peripheral portion of the stator or the armature.

Abstract: An ultrasonic fuel injector for injecting a pressurized liquid fuel into the combustion chamber of an internal combustion engine that uses an overhead cam for actuating the injector includes a valve body having an injector needle disposed therein forming a needle valve to meter the flow of fuel through the injector. The valve body is formed of ceramic material that is transparent to magnetic fields changing at ultrasonic frequencies. The injector needle includes a magnetostrictive portion disposed in the region of the valve body that is surrounded by a wire coil wound around the outside surface of the ceramic valve body. The wire coil is connected to a source of electric power that oscillates at ultrasonic frequencies. A sensor is configured to signal when the overhead cam is actuating the injector to inject fuel into the combustion chamber of the engine.

Abstract: A fuel injector valve for fuel injection systems of internal combustion engines has a magnetic coil, an armature to which the magnetic coil applies a force against a resetting spring in the lifting direction, and a valve needle connected to a valve closing member. The armature is able to move between a first stop connected to the valve needle and limiting the movement of the armature in the lifting direction and a second stop connected to the valve needle and limiting the movement of the armature against the lifting direction. The second stop is formed by a spring element.

Abstract: A method and apparatus for defining a spray pattern to reduce the variation in the metering, targeting, distribution, and atomization of the fuel output of a fuel injector. The fuel injector contains a closure member extending along the longitudinal axis of the injector. The closure member can be positioned contiguous to a seat to occlude fuel flow. A sealing radius is defined when the closure member is in this position. The closure member can also be positioned such that it is not contiguous to the seat, thereby permitting fuel flow. A plate is disposed proximate to the seat with a first and second face, the first face facing the seat. An inlet is located on the first face of the plate, and at least one chamber is disposed on the second face of the plate. The inlet and the at least one chamber are in fluid communication. An orifice disc is disposed in a confronting arrangement with the second face of the plate such that each chamber is located proximal to each orifice.

Abstract: A cover for use with a fuel injector. The cover formed of at least two separate pieces that are assemble over the fuel injector. The pieces are held together by a detent member and cooperate to form a cavity that houses the fuel injector. A complaint member is positioned within the cavity to minimize relative movement between the cover and the fuel injector.

Abstract: A fuel injector is provided. The fuel injector also includes a multi-layer orifice plate assembly located at the housing outlet. The orifice plate assembly includes a first orifice plate having a plurality of first openings extending therethrough and a second orifice plate disposed proximate to the first orifice plate. The second orifice plate includes a first face having a perimeter, and a plurality of channels extending radially therethrough to the longitudinal axis. The second orifice plate also includes a second face disposed opposite the first face and a plurality of second openings extending between the first face and the second face. The fuel injector also includes an air assist sleeve disposed about the housing proximate to the outlet. The air assist sleeve includes at least one air channel in communication with the plurality of channels. A method of providing a fuel/air mixture is also provided.

Abstract: A fuel injector including a fuel intake, having an excitable actuating device using which a valve-closure member can be moved, having a fixed valve seat configured on a valve seat element, with which valve-closure member cooperates for opening and closing the valve. Also included in the fuel injector are a fuel outlet provided downstream of the valve seat, and a sleeve-shaped connecting part, that has an interior longitudinal opening and that receives the valve seat element. The thin-wall connecting part has formations that increase the rigidity and prevent a bending or a folding of the connecting part, the formations being executed in the shape of longitudinal creases. The valve is particularly well-suited for use in fuel injection systems of mixture-compressing, spark-ignited internal combustion engines.

Abstract: A control valve configuration is described which is used in a fuel injector for internal combustion engine. The control valve contains a valve body that can be displaced axially in a valve chamber by an actuating device and is formed of two rigidly connected sections. A first section of the valve body forms a seat valve between the valve inlet and valve outlet in a first section of the valve chamber. The seat valve is closed in a rest position of the valve body and is opened in a working position of the valve body. A second section of the valve body and a second section of the valve chamber form a slide valve which, in the rest position of the valve body, produces a fluidic connection between the valve outlet and a return opening and blocks the fluidic connection between the seat valve and the valve outlets and which closes the return opening and then starts to produce a fluidic connection between the seat valve and the valve outlet only after it leaves the rest position.

Abstract: A fuel injector, in particular a high-pressure injector for directly injecting fuel into a combustion chamber of a mixture-compression, spark-ignition internal combustion engine, which is characterized in that on a valve seat element a conical section is formed having a valve seat surface, to which an outlet opening is immediately connected on the downstream side. The outlet opening has an intake plane, an outlet plane, and a central axis, the central point of the intake plane being offset with respect to the valve longitudinal axis and the central axis running diagonally with respect to the valve longitudinal axis. Upstream of the valve seat element a disk-shaped swirl element is arranged, which can be used both for generating a right swirl as well as a left swirl.

Abstract: An electromagnetically actuated valve (1) has a core (5), a solenoid coil (8) and an armature that can be acted upon by the solenoid coil (8) in a stroke direction in opposition to a restoring spring (27), and a valve needle (13). The valve needle (13) is fixedly joined both to the armature (11) as well as to a valve-closure member, which cooperates with a fixed valve seat, and constitutes a movable valve element. On the valve needle (13), between the armature (11) and the valve-closure member, an auxiliary body (30) is arranged, which is movable relative to the valve needle (13). The valve needle (13) is designed as having a driving arrangement (34) such that, in response to a motion of the auxiliary body (30) in the stroke direction, the valve needle (13) can be accelerated in the same direction by energy transfer, and a rapid opening of the valve is realized.

Abstract: A fuel injector for use with an internal combustion engine. The fuel injector comprises a valve group subassembly and a coil group subassembly. The valve group subassembly includes a tube assembly having a longitudinal axis that extends between a first end and a second end; a seat that is secured at the second end of the tube assembly and that defines an opening; an armature assembly that is disposed within the tube assembly; a member that biases the armature assembly toward the seat; an adjusting tube that is disposed in the tube assembly and that engages the member for adjusting a biasing force of the member; a filter that is located within the tube assembly and integral with the adjusting tube; and a first attachment portion. The coil group subassembly includes a solenoid coil that is operable to displace the armature assembly with respect to the seat; and a second attachment portion that is fixedly connected to the first attachment portion.

Abstract: A fuel injector for use with an internal combustion engine. The fuel injector comprises a valve group subassembly and a coil group subassembly. The valve group subassembly includes a tube assembly having a longitudinal axis that extends between a first end and a second end; a seat that is secured at the second end of the tube assembly and that defines an opening; an armature assembly that is disposed within the tube assembly; a member that biases the armature assembly toward the seat; an adjusting tube that is disposed in the tube assembly and that engages the member for adjusting a biasing force of the member; a filter that is disposed at least within the tube assembly; and a first attachment portion. The coil group subassembly includes a solenoid coil that is operable to displace the armature assembly with respect to the seat; and a second attachment portion that is fixedly connected to the first attachment portion.

Abstract: A fuel injector is disclosed. The fuel injector includes a hollow body having an upstream segment and a downstream segment and a valve. The valve has a needle assembly which includes an upstream segment having a first longitudinal channel extending therethrough and a magnetic armature located within the first longitudinal channel. The armature includes a passage extending therethrough. The needle assembly also includes a downstream segment having a second longitudinal channel co-axial with and communicating with the first longitudinal channel. The second longitudinal channel extends through the downstream segment. The needle assembly also includes a seating body located at a downstream end of the downstream segment and a transverse passage located upstream of the seating body. The transverse passage communicates with at least one of the first and the second longitudinal channels. A method of fabricating a needle assembly for a fuel injector is also disclosed.

Abstract: The present invention provides a fuel injector having a fuel inlet, a fuel outlet, and a fuel passageway extending along an axis between the fuel inlet and the fuel outlet. The fuel injector includes a body having an inlet portion, an outlet portion, and a neck portion disposed between the inlet portion and the outlet portion. An armature is disposed within the neck portion of the body and displaceable along the axis relative to the body. A spring is disposed within the neck portion and applies a biasing force to the armature. The spring has a downstream end disposed proximate the armature and an upstream end opposite from the downstream end. An adjusting tube is disposed within the neck portion of the body and proximate to the upstream end of the spring. The adjusting tube varies the biasing force applied by the spring to the armature.

Abstract: A valve needle for use in an electromagnetically operable injection valve of a fuel injection system in an internal combustion engine includes a connecting part that is made of a plastic bar and that is connected to an armature and a valve closing element. In order to achieve a tight connection of the valve needle components, the connecting part enters into a form-fitting connection with the armature and with the valve closing element. The form-fitting connection between the connecting part and the valve closing element includes corresponding areas of larger and smaller diameters engaging with one another.

Abstract: A fuel injector, in particular a high-pressure injector for directly injecting fuel into a combustion chamber of a mixture-compression, spark-ignition internal combustion engine, which is characterized by the fact that at a valve seat element a conical section is formed having a valve seat surface, to which an outlet opening is immediately joined in the downstream direction. The outlet opening has an intake plane, whose central point lies on the valve longitudinal axis, whose central axis, however, runs diagonally with respect to valve longitudinal axis. A disk-shaped swirl element is arranged upstream of the valve seat element. The swirl element has swirl channels, which are distributed over the periphery, the swirl channels having varying geometries or dimensions.

Abstract: A fuel injector is provided. The fuel injector includes a metering member for delivering fuel from a delivery end of the fuel injector. The metering member comprises a seat disposed proximate the delivery end of the fuel injector; and an armature assembly. The armature assembly includes a longitudinal axis, a seating element disposed generally along the longitudinal axis, and an elongated tube. The elongated tube has a first end, a second end, and a tube channel extending from the second end toward the first end. The first end has a first portion connected to the seating element with at least one weld and a second portion disposed distal from the longitudinal axis from the first portion. The armature assembly is reciprocably disposed within the fuel injector between a closed position wherein the seating element is biased against the seat and an open position wherein the seating element is disposed away from the seat. A method of manufacturing the armature assembly is also provided.

Abstract: The fuel injection valve of the present invention is constituted such that a needle valve 5 and a movable core 4 are movably disposed in an axial direction in the inside of a body 1. Here, a fixed member 8 which the movable core 4 approaches at the time of closing the valve is disposed in the body 1, and a gap is formed between the movable core 4 and the fixed member 8 at the time of closing the valve. When fuel remaining in the gap between the movable core 4 and the fixed member 8 is pressurized according to the movement of the movable core 4 to the valve closing side, a squeezing portion SB1 is disposed at a portion which constitutes a passage for the fuel extruded from the gap. At the time of closing the valve, a squeezing reaction force (reaction force against the squeezing-out force or pushing-out force generated at the time of pressurizing a liquid and squeezing a liquid through the gap) is generated on the movable core 4.

Abstract: A fuel injection valve is capable of minimizing the waste of fuel and variations in the air-fuel ratio by weakening a water hammer action occurring as a result of sudden closing of a needle valve and thus suppressing the occurrence of a bouncing phenomenon. A water hammer absorbing member is provided between an armature and an injection hole to absorb and damp a water hammer pressure wave produced by sudden closing of the needle valve. Therefore, it is possible to reduce the pressure wave propagated to the armature, to which the needle valve is integrally secured, and hence possible to reduce the amount of lift of the needle valve due to a bouncing phenomenon. Accordingly, the amount of fuel excessively discharged is reduced. Thus, it becomes possible to minimize the waste of fuel and variations in the air-fuel ratio.

Abstract: A solenoid valve is provided which may be used to inject fuel into an internal combustion engine for automotive vehicles. The solenoid valve is designed to keep an air gap between a stator and an armature at a constant interval required to ensure a normal operation of the solenoid valve. The solenoid valve includes a spacer which is provided between the stator and the armature to keep the air gap without any hit of the armature on the stator. In one embodiment, the spacer is installed on a peripheral portion of the stator or the armature.

Abstract: In an electromagnetic fuel injector, when an opening valve pulse is turned ON by a command from an ECU, a first coil is energized and a first fixed core attracts a moving core and unseats a valve member from a valve seat to open a valve of the fuel injector. A time Tx before the opening valve pulse becomes OFF, a closing valve pulse is turned ON, whereby a second coil is energized and a second fixed core attracts the moving core toward a valve closing direction. As a result, after the valve starts to close, the urging force in the valve closing direction increases rapidly, the time delay from the start of valve closing to the end is shortened, and the valve closing responsiveness improves.

Abstract: A fuel injector for fuel injection systems of internal combustion engines, which is composed of two preassembled, independent subassemblies. In this context, a functional part essentially includes an electromagnetic circuit and a sealing valve, whereas a connecting part is essentially constituted of a hydraulic connection. In the ready-assembled injector, electrical connecting elements and hydraulic connecting elements of both subassemblies cooperate so that a reliable electrical and hydraulic connection is ensured. The valve is executed as a side-feed injector, and the electrical connection is located farther away from functional part than the hydraulic connection of the connecting part. The fuel injector is particularly suitable for use in fuel injection systems of mixture-compressing, positive ignition internal combustion engines.