Abstract: To enable 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, a fuel passageway 203 is provided 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: A fuel injection device for internal combustion engines having a magnet valve that has a damping chamber and a relief chamber which communicate hydraulically through a damping throttle that damps in both laminar and turbulent fashion. As a result, the waviness of the characteristic curves of the fuel injection system is reduced and its function is improved.

Abstract: A fuel injector comprises a magnet coil which coacts with an armature that is impinged upon by a return spring and is configured together with a valve needle, a valve closure member that, with a valve seat element, forms a sealing seat being configured on the valve needle; and comprises at least one contact lug that is conductively connected to the magnet coil. A metal hollow body forms an inlet-side extension of the fuel injector, a connector plug having a contact lug being attachable onto the metal hollow body in such a way that the contact lug of the connector plug can be brought into conductive connection with the contact lug (6) of the magnet coil.

Abstract: A solenoid-operated fuel injection valve includes a container into which fuel is introduced, a needle member that is disposed in the container and that moves longitudinally, and an electromagnetic controller provided with first and second magnetic circuits through which suction forces can be controlled independently of each other. The electromagnetic controller changes an area of a fuel flow passage defined as a space between an inner surface of the container and an outer surface of the needle member by moving the needle member by means of the suction forces. The fuel injection valve may provide two limit strokes to achieve variable injection rates.

Abstract: A fuel injector (1) is provided with a magnetic coil (10), which cooperates with an armature (20) acted upon by a restoring spring (23), the armature forming an axially movable valve part together with a valve needle (3). A valve-closure member (4), which forms a sealing seat with a valve-seat member (5), is provided at the valve needle (3). A flange (14), which penetrates the armature (20) through an opening (19) of the armature (20) and which is connected to the valve needle (3) by force-locking, has at least one radial fuel channel (11) with whose aid an inner chamber (29) of the fuel injector (1) is able to be connected to a recess (22) of the valve needle (3) upon actuation of the fuel injector (1).

Abstract: A fuel injector includes a pressure intensifying chamber communicating with a fuel supply passage through a check valve, a plunger for pressure-intensifying fuel introduced into the pressure intensifying chamber, and a needle valve for injecting the fuel pressure-intensified in the pressure intensifying chamber through an injection port, wherein there is provided in the fuel supply passage a throttle passage normally communicating with a fuel drain passage, air being bled during startup while leaking fuel.

Abstract: A fuel injector for the direct injection of fuel, especially into the combustion chamber of a mixture-compressing internal combustion engine having external ignition, is located in a cylinder head of the internal combustion engine in a receiving bore of the cylinder head, and includes a nozzle body and a sealing ring which seals the fuel injector from the cylinder head of the internal combustion engine. At an end on the discharge side of the fuel injector, an at least partially spherical body is formed which abuts at least partially against a wall of the receiving bore, a groove being circumferentially formed on the body in which the sealing ring is positioned.

Abstract: A method of producing fuel injectors for internal combustion engines provides for establishing a working life of each injector conforming with the working life of the internal combustion engine on which it is installed. Each injector has an injector body having a seat; a valve body housed inside the seat so as to form an annular chamber, for receiving high-pressure fuel, and a gap communicating with the annular chamber; and a seal housed inside the annular chamber to seal the gap. The seal is sized as a function of the permanent deformation to which the seal is subjected during use of the injector, so as to achieve a working life of the injector substantially equal to the working life of the engine.

Abstract: An electromagnetic actuator for a fluid pressure control valve in a fuel injector for an internal combustion engine is disclosed. The fuel injector comprises a control module including a fuel pressure control valve; an armature connected to the fuel pressure control valve; and a stator assembly including a magnetic core comprising of at least two segments and a bobbin. The stator assembly, when it is energized by a power source, produces a magnetic field to draw the armature towards the stator assembly.

Abstract: A fuel injector, e.g., for fuel injection systems of internal combustion engines, for direct injection of fuel into the combustion chamber of an internal combustion engine. The fuel injector includes a solenoid, an armature, which is acted upon in a closing direction by a restoring spring, and a valve needle, which is linked in a force-locking manner to the armature, for actuating of a valve-closure member, which together with a valve-seat surface forms a sealing seat. The armature includes a first armature part and a second armature part, the restoring spring is supported on the first armature part and the second armature part is linked in a force-locked manner to the valve needle. The valve needle is acted upon in the closing direction by the restoring spring via the first armature part and the second armature part so that the valve-closure member is held in a sealing position on the valve-seat surface.

Abstract: A fuel injector for a fuel injection system of an internal combustion engine is described. The fuel injector has a fuel inlet connection piece for supplying fuel, a piezoelectric or magnetostrictive actuator, which is sealed off from the fuel by a seal, and a valve closing body actuatable by the actuator via a valve needle. The valve closing body working together with a valve seat surface to form a seal seat. The seal includes an inlet-side gasket, which is arranged between the fuel inlet connection piece and the actuator, and an actuator jacket that is elastically deformable in a longitudinal direction and is connected to the inlet-side gasket.

Abstract: A method involves retrofitting conventional injectors with needles having magnetostrictive portions and wound coils configured and disposed so as to subject the magnetostrictive portions of the needles to ultrasonically oscillating magnetic fields.

Abstract: Disclosed is an injector for fuel injection, with a magnet valve for controlling an injection valve, in which the magnet valve has a movable armature that can be moved onto a valve seat in the lower armature chamber. The lower armature chamber communicates fluidically with the control pressure chamber of the injection valve via bores. Via a return bore, incidental leak fuel quantities can be returned to a tank via the lower armature chamber. To prevent armature recoil upon closure of the valve seat by the armature, it is proposed that means be provided in the injector for reducing pressure fluctuations occurring in the lower armature chamber. Eliminating pressure fluctuations in the lower armature chamber leads to maximal elimination of armature recoil.

Abstract: A fuel injection valve includes: a magnetic barrel body made of a magnetic material and shaped substantially into a barrel, a core barrel made of a magnetic material and shaped substantially into a barrel, a valve seat member positioned on a downstream side of the core barrel and disposed in the magnetic barrel body, a valve body positioned between the core barrel and the valve seat member, an O-ring positioned in a vicinity of a flange portion of the magnetic barrel body, a fuel filter assembly disposed at the first end on the fuel's influx side of the magnetic barrel body. A flange of the fuel filter assembly is made of a material lower in hardness than the magnetic material of the magnetic barrel body. The flange of the fuel filter assembly has a diameter larger than the diameter of the flange portion of the magnetic barrel body.

Abstract: The injector has a hollow body housing the body of the metering valve, which has a discharge hole for discharging the usual control chamber. The hole comes out at a flat surface of the valve body, and is engaged by a flat surface of a plate, under the control of an armature of an electromagnet. The armature is in the form of a disk, has substantially no stem, is connected to the hollow body by a leaf spring hinge, and has a surface having a spherical-bowl-shaped recess. A ball is located between the recess and another recess carried by a second surface of the plate. The valve body is fixed to the hollow body by a ring nut of a given height. And, to cover the distance between the valve body and the armature, a spacer member is preferably formed in one piece with the valve body.

Abstract: The injector has a hollow body supporting an ordinary injection nozzle and a metering valve for metering the fuel to be injected; and a support defined by a sleeve and by an end wall. The sleeve houses an electromagnet controlling the metering valve, and is fitted to the hollow body. For which purpose, there is provided a leaf spring having a ring-shaped portion engaging the end wall of the support; and a number of elastic blades, each terminating with a hook-shaped appendix which engages a corresponding retaining element on the hollow body.

Abstract: A fuel injector, particularly a fuel injector for fuel injection systems of internal combustion engines, has a magnetic coil, an armature acted upon in a closing direction by a resetting spring and a valve needle connected to the armature by force-locking for operating a valve-closure member, which forms a sealing seat together with a valve-seat surface. The armature has a pot-shaped axial extension, in which at least one cutout is formed.

Abstract: A fuel injector (1) for fuel injector systems of internal combustion engines has a valve-closure member (4) which is mechanically linked to a valve needle (3) and cooperates with a valve-seat surface (6) of a valve-seat member (5) to form a sealing seat. A turbulence-producing element is provided in the valve-seat member (5), situated downstream from the sealing seat, and its center line (38) preferably forms an angle different from zero with the center line (39) of the fuel injector (1), a threaded rod (36) being pressed into the valve-seat member (5) as the turbulence-producing element.

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 at the first end of the tube assembly and that has an integral retaining portion; an O-ring that circumscribes the first end of the tube assembly and that is maintained by the retaining portion of the filter; and a first attachment portion.

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: Fuel injector provided with a piezoelectric actuator, a valve activated by the piezoelectric actuator and regulating a fuel supply that flows in a working direction, and a mechanical transmission placed between the piezoelectric actuator and the valve; an expansion of the piezoelectric actuator displaces the valve in the working direction from a closed position to an open position in an opposite direction to that of the fuel outlet.

Abstract: A two stage intensifier capable of multiple intensification rates comprises a stepped top portion and a shoulder portion, each being actuated by separate fluid passages. A stepped top portion is received into an upper bore of a piston bore and a shoulder is received into a lower bore. The stepped top forms a seal with the upper bore to prevent direct fluid communication between a first actuation cavity above the stepped top and a second actuation cavity above the shoulder.

Abstract: A fuel injector for fuel injection systems of internal combustion engines and a method of manufacturing same are described. The fuel injector includes a valve seat body into which a valve seat face is introduced, which cooperates with a valve closing body to form a sealing seat, and a nozzle body to which the valve seat body is fixedly connected. The valve seat body is insertable into the interior of the nozzle body and on its downstream side it has a partially spherical outside geometry, which rests on a bearing surface of a seat body recess in the nozzle body. Valve seat body is mounted so it can rotate relative to the nozzle body on the bearing surface until its position is finally secured, and it may be aligned by a centering mandrel.

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 injection valve has: a tubular body, a valve seat member, a valve body, a core tube, a bias spring, and an electromagnetic actuator. The core tube is press fitted into the tubular body. The core tube has a first end side opposing an absorption section of the valve body in such a manner as to form an axial gap interposed between the first end side of the core tube and the absorption section. The core tube has a second end side axially extending in the tubular body to a certain position on a way to the second end side of the tubular body. The axially extending second end side of the core tube has an outer periphery which is formed with a reduced diameter section for increasing an accuracy in positioning the core tube when the core tube is press fitted into the tubular body.

Abstract: A fuel injector including a tubular casing having an axial fuel passage. Disposed within the fuel passage are a valve seat element, a core cylinder, and a valve element axially moveably disposed therebetween and opposed to the core cylinder with an axial air gap. An electromagnetic actuator cooperates with the casing, the valve element and the core cylinder to form a magnetic field forcing the valve element to the open position against a spring between the valve element and the core cylinder upon being energized. The casing includes a reluctance portion producing an increased magnetic reluctance and allowing the magnetic field to extend to the valve element and the core cylinder through the air gap. The reluctance portion has a reduced radial thickness and an axial length extending over the air gap.

Abstract: A solenoid valve for controlling a fuel injector of an internal combustion engine, including an electromagnet, a movable armature featuring an armature plate and an armature pin, as well as a control valve member, which is moved with the armature and cooperates with a valve seat, for opening and closing a fuel discharge passage of a control pressure chamber of the fuel injector, the armature plate being supported on the armature pin, so that it is slidably movable in the closing direction of the control valve member under the action of its inertial mass, against the elastic force of a return spring that acts upon the armature plate; and including a hydraulic damping device which permits damping of a post-oscillation of the armature plate during its dynamic sliding on the armature pin.

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, e.g., a fuel injector protruding directly into a combustion chamber of an internal combustion engine, includes an energizable actuator, a valve-closure member able to be moved by the actuator, a secure valve seat, with which the valve-closure member cooperates to open and close the valve, a fuel outlet formed in a downstream spray-discharge region and by at least one outlet opening situated downstream from valve seat, and a dead volume formed downstream from valve seat and upstream from the spray-discharge region having at least one outlet opening. A surface of valve-closure member bordering the dead volume has a surface structure having at least several pores with a surface roughness of at least 25 &mgr;m for gas accumulation.

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 at the first end of the tube assembly and that has an integral retaining portion; an O-ring that circumscribes the first end of the tube assembly and that is maintained by the retaining portion of the filter; and a first attachment portion.

Abstract: A valve seat/director unit the combines the functions of an injector valve seat and a separate spray director plate into an integral unit combining both functions. The unit is a generally flat plate having an outer portion with at least one sealing rib. A central portion includes at least one endless rib forming a valve seat and surrounding a spray director including a recessed area communicating with at least one fuel spray opening. Upper surfaces of the sealing rib(s) and valve seat are preferably flat and coplanar with one another for engagement by cooperating surfaces of an injector member and a valve member, respectively.

Abstract: A unitary fuel injector and nozzle assembly comprising a high-pressure piston pump and a cylinder body that define a high-pressure fuel pump chamber. An injector nozzle assembly is in fluid communication with the pump chamber and is held in place by a nozzle nut detachably secured to the cylinder body. A nozzle valve assembly includes a spring located in a spring cage within the nozzle nut. A control module is assembled between the cylinder body and the spring cage, the module including a module body having a valve chamber that receives a control valve and a stator assembly as separate and removable elements of the module whereby the stator assembly, the nozzle valve assembly and the control valve can be changed independently of the other elements of the injector to meet various operating requirements.

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 electrical actuator subassembly, preferably for use in a fuel injector, includes an externally threaded ferromagnetic metallic body, an internally threaded collar, an electrical actuator, an electrical connector, and a plastic cap. In one embodiment, the electrical actuator is a solenoid, while a piezoelectric actuator is used in a second embodiment. The electrical actuator directly controls a pilot valve member positioned between the metallic body and the injector body, and a needle valve which opens or closes a nozzle outlet at the bottom of the injector. The electrical actuator subassembly is attached to a fuel injector body by mating the external threads of the metallic body to the internal threads of the collar. The collar is attached to the injector body with a groove and snap ring configuration.

Abstract: A dual-coil outwardly-opening fuel injector including a fuel tube connected at a lower end to a lower injector housing. Within the fuel tube are a lower (opening) solenoid pole piece, a specially-formed armature, and an upper (closing) solenoid pole piece. A seat assembly including an injector nozzle, swirler, and valve seat are adjustably threaded into the lower housing. A pintle assembly, including a solid pintle portion supporting a valve head and a tubular portion welded thereto, is axially disposed within the fuel tube and is welded to the armature which is spaced from the lower pole piece by a distance equal to the opening stroke of the valve. A return spring adjustment mechanism disposed on the upper pole piece engages the upper end of the pintle assembly for varying the closing force of the return spring. Opening and closing solenoid preassemblies are mounted external to the fuel tube for magnetically engaging the pole pieces and armature within in known fashion.

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 within the 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: The invention relates to hydro mechanics and can be used for deep borehole drilling for cavitation erosion of a bottomhole, for opening-out a new productive layer for a casing pipe perforation, for bed stimulation in order to create channels for inflow pressure, for scraping out a pipe, for dispergating solid particles in a fluid and for mixing nonsoluble fluids, for eliminating microbiological features from a fluid, and also in mass exchange devices and in hydrosystems for forming a cavitating fluid jet. The inventive cavitating jet comprises a body provided with a profiled flow channel and a barrier obstructing a flow. The barrier can move in a radial direction. The jet cavity is divided by a baffle into two chambers and the movable barrier at the extreme position thereof closes the flow section of one chamber. The barrier can be embodied in the form of a ball or cylinder having one or several degrees of freedom for radial displacement and closes at least 80% of the total section of the jet channel.

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 located 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: 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 fuel injector, in particular an injector for fuel injection systems in internal combustion engines, has a piezoelectric or magnetostrictive actuator, a valve closing body which can be operated by the actuator by way of a valve needle and which cooperates with a valve seat face to form a sealing seat, and having a hydraulic lifting device including two lifting cylinders that can move in opposite directions. The lifting device is a subassembly hermetically sealed off from a valve interior and has a housing having at least one section which is flexible in the axial direction.

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: 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: 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: Several methods of setting the armature lift of a modular fuel injector are disclosed. The methods include the use of a crush ring or a lift sleeve that is inserted into the valve body during assembly of the modular fuel injector. The methods further include the technique of adjusting the relative axial position of the valve body relative to a non-magnetic shell body. The methods additionally include the adjustment of the pole piece relative to the non-magnetic shell prior to both parts being affixed together. The method also includes axial adjustment of the lift sleeve after the insertion of the lift sleeve into the valve body. The modular fuel injector comprises a valve group subassembly and a coil group subassembly.

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.