Abstract: Fluid in a chamber, through which a fuel control armature is moving, is used to dampen armature vibrations. This dampening effect is achieved by forming a passage through which the fluid flows as the actuator moves to a steady state position. This passage may be implemented in a control module for controlling fuel delivery in a fuel injector. The control module includes a control module housing defining the cavity. The armature is disposed at least partially within the cavity. The armature affects the flow of fuel in the injector by changing the area of a fuel port through which fuel passes. The fluid passage is formed as the armature moves towards a contact wall defining the cavity.

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 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: A press-machined fuel induction pipe 40, a hollow tubular type of fixed core 1 with a flange at its upper end, and a nozzle holder 18 that was press-machined into a slender tubular shape and has an orifice plate equipped with a valve seat at the lower end of the nozzle holder, are connected by welding. The upper inner surface of nozzle holder 18 and the outer surface of fixed core 1 are welded after being press-fit. A movable core 14 and a valve body 16 are connected to the welded assembly via a point 15 having a spring function. On the outer surface of nozzle holder 18 is provided an electromagnetic coil 2, the outside of which is provided with a tubular yoke 4 whose upper end is connected by welding to the flange 1a of fixed core 1 and whose lower end is press-fit on the outer surface of nozzle holder 18.

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; an O-ring that circumscribes the first end of the tube assembly and that can be maintained by a retaining portion of the filter; and a first attachment portion.

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: 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: 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 adjusting tube is disposed within the neck portion of the body. A spring is disposed within the neck portion of the body, the spring having an upstream end proximate to the adjusting tube and a downstream end opposite the upstream end. An armature having a lower portion is disposed within the neck portion of the body and displaceable along the axis relative to the body. The downstream end of the spring is disposed proximate to the armature, the spring applying a biasing force to the armature. A valve seal is substantially rigidly connected to the lower portion of the armature. The fuel injector includes a valve group subassembly that is connected to a coil group subassembly.

Abstract: A valve actuating device is provided which may be employed in fuel injectors for automotive internal combustion engines. The valve actuating device includes an actuator, a large-diameter piston displaced by said actuator, a small-diameter piston operating a valve, a displacement amplifying chamber filled with working fluid to amplify and transmit displacement of the large-diameter piston to the small-diameter piston, and a drain passage. The drain passage communicates with the displacement amplifying chamber through a pinhole for draining the working fluid within the displacement amplifying chamber, thereby enabling the pressure in the displacement amplifying chamber to be released in order to ensure the movement of the small-diameter piston when the valve actuating device is started.

Abstract: A fuel injector for fuel injection systems of internal combustion engines has an electromagnetic actuating element including a magnet coil, a tubular internal pole and an external magnetic circuit part, a valve sleeve having an internal opening and thin walls and a movable valve closing body which works together with a valve seat assigned to a valve seating body. The valve seating body and the internal pole are fixedly arranged in the internal opening in the valve sleeve . The internal pole has a longitudinal slot formed by producing it by rolling and/or bending.

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: 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: 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 having a housing including an inlet, an outlet, and a passageway for fuel flow from the inlet to the outlet. A coil assembly is disposed proximate the inlet of the fuel injector. A seat is disposed proximate the outlet of the fuel injector. A closure member is disposed in the housing and operable by the coil assembly to permit and prohibit fuel flow through the seat. The closure member includes a strap member that extends along a longitudinal axis and has at least two radial projections and a central member. The strap member includes an outer surface a distance D from the longitudinal axis. The at least two radial projections having first and second ends. A sealing member is coupled to the central member. An armature member is coupled to the second ends of the strap member. Also, a method for forming the strap member.

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 assembly for a fuel injector having a metallic armature and a metallic poppet attached to the armature at an interface location. The armature and/or the poppet includes a coating at the interface location, where the coating has a higher resistance to corrosion as compared to the base material of the poppet and/or the base material of the armature.

Abstract: The present invention provides a solenoid actuated fuel injector. The fuel injector includes a housing having a fuel inlet, a fuel outlet, and a fuel passageway extending along a longitudinal axis. The fuel injector additionally includes a valve body having an inlet portion and an armature guide eyelet that is disposed in the inlet portion of the valve body within the fuel passageway. A closure assembly includes an upper bearing guide fixedly connected to a stem portion. The upper bearing guide includes a bearing portion and a contacting portion. The armature guide eyelet includes a first portion circumscribing the upper bearing guide portion, and a second portion engaging the upper bearing guide contacting portion. Methods of mechanically insuring a repeatable stroke of a closure assembly and operating a closure assembly within a solenoid actuated fuel injector are also provided.

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 solenoid actuated fuel injector includes a valve body, a valve seat at one end of the valve body and having a seating surface facing the interior of the valve body and including a fuel outlet opening, a fuel tube for conducting pressurized fuel into the valve body against the seating surface, a spherical valve ball moveable between a seated position against the seating surface to close the outlet opening against fuel flow, and an open position spaced from the seating surface to allow fuel flow through the outlet opening, a spring in the valve body and biasing the valve ball toward the seated position, an armature axially moveable in the valve body and including a valve ball capturing member at an end proximate the seating surface, the valve ball capturing member being engageable with the ball outer surface adjacent the seating surface, and a solenoid coil operable to draw the armature away from the seating surface, thereby moving the valve ball to the open position and allowing fuel to pass through the fuel

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 method of directly setting an injector lift that involves the provisioning of a valve body having an uniform internal diameter, inserting a sleeve assembly to a predetermined distance and securing the sleeve assembly. The apparatus includes a sleeve, a lower armature guide and a seat, all of which can be integral so as to facilitate the setting of the injector lift. The sleeve assembly is press-fitted and secured by known attachment techniques.

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: 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: A fuel injector (1), especially an injector for fuel injection systems of internal combustion engines (51), has a piezoelectric or magnetostrictive actuator (14), a valve-closure member (8) that is actuated by an actuator (14) using a valve needle (9), the valve-closure member cooperating with a valve seat surface (7) to form a sealing seat, and having at least one spray-discharge opening (10, 11) that is sealed by the sealing seat. In this context, the valve seat surface (7) and/or the valve-closure member (8) has partial areas (30a, 30b) that are arranged so as to be offset on the circumference, the partial areas throttling a fuel flow to differing extents as a function of a stroke of the valve needle (9).

Abstract: The invention relates to an injector for injecting fuel, which is at high pressure, into the combustion chambers of an internal combustion engine. In the injector housing of the injector, a control part and a nozzle needle are received movably, and the injection nozzle inlet is opened by opening a valve chamber and by pressure relief of a control chamber. In the injector housing, control chambers for actuating a nozzle needle and the control part are provided, which can be pressure-relieved via a common control valve.

Abstract: In a fuel injection valve in which an outer frame member is press fitted to a limited region of an outer circumference of an inner pipe member in a state that a drive coil is radially sandwiched therebetween, a valve lift amount is accurately adjusted by press fitting the attracting member to the inner pipe member without being adversely affected by a possible deformation of the inner circumference of the inner pipe member on press fitting the outer frame member to the inner pipe member due to a relief space provided in the inner circumference of the inner pipe member for preventing the outer circumference of the attracting member from contacting the inner circumference of the inner pipe member at least at a position just radially inside and axially corresponding to the limited region.

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 has 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 comprises a body, an armature, a spring, and a spring stop. The body has an inlet portion, an outlet portion, and a passage disposed between the inlet portion and the outlet portion. The armature is disposed within the passage and is displaceable along the axis relative to the body. The spring is disposed within the passage and applies a biasing force to the armature. The spring has a first end disposed proximate the armature and a second end opposite from the first end. The spring stop is disposed within the passage and has a first and second portion. The first portion includes at least one projection engaging the passage. The at least one projection extends obliquely with respect to the axis and in a direction general toward the inlet portion.

Abstract: In a fuel injection valve, a cylindrical valve body has a valve seat protruding radially inward out of an inner wall thereof and a needle supporting cylindrical inner wall. A nozzle needle is fixed to the armature so as to move together with the armature, while being supported slidably by the needle supporting cylindrical inner wall. The nozzle needle is provided with a valve portion to be seated on the valve seat when a coil is de-energized and inside thereof with a cavity into which fuel is introduced. A fuel accumulation bore is provided between inner circumference of the cylindrical valve body and outer circumference of the nozzle needle. With the construction mentioned above, the nozzle needle is provided with an opening through which the cavity communicates with the fuel accumulation bore.

Abstract: A fuel injector includes a flexural element connected to a valve armature for restricting radial movement of the armature within a fuel passage. The flexural element is flat and exerts no force on the valve when it is closed but is flexed when the valve is opened and supplements the valve spring force during closing of the valve. The flexural element also is used to set the valve stroke length equal to the element's thickness. A flat tool presses a valve ball into the armature while the ball is seated on a valve seat until the flexural element engages a seat related surface. Engagement of the tool with the flexural element fixed to the armature assures that the flexural element is in an unloaded flat position when the valve is closed and establishes the valve stroke when the valve assembly and seat are installed in the injector body.

Abstract: A stationary core has a press fitting portion and is secured to an inner peripheral wall of a tubular member by press fitting, so that an outer peripheral wall of the press fitting portion of the stationary core is engaged with the inner peripheral wall of the tubular member, and a radial space is formed upstream of the press fitting portion of the stationary core between the stationary core and the tubular member. The stationary core can have a tapered annular outer surface section, which is arranged in an outer peripheral wall of a downstream end portion of the stationary core and is tapered toward a downstream end of the stationary core at a taper angle of 2 to 60 degrees to have a reduced outer diameter.

Abstract: The fuel-injection valve has the feature that provision is made at the downstream end of the injection valve for a preparation attachment which is made of a gas-containing part and an insertion member. The downstream end of the injection valve with the preparation attachment is completely surrounded in the circumferential direction by a tubular, thin-walled, metallic gas-containing member. The gas-containing member is secured to the injection valve by a non-integral snap-fit, catch or clip connection to a plastic extrusion coating at least partially enveloping the valve housing. The corresponding connection elements are constructed in the form of projections and clips. The fuel-injection valve is particularly suited for injection into the intake passage of a mixture-compressing internal combustion engine with externally supplied ignition.

Abstract: A fuel injector (1), especially an injector for fuel injection systems of internal combustion engines, includes a first solenoid coil (5), which cooperates with the first armature (9), a valve needle (13) in a force-locking connection with the first armature (9) for actuating a valve-closure member (14), which together with a valve seat surface (15) forms a sealing seat, and a second solenoid coil (6). In this context, the first armature (9) is acted upon in a closing direction by a first resetting spring (11). A second armature (10) cooperates with the second solenoid coil (6) such that, when the first solenoid coil (5) and the second solenoid coil (6) are supplied with current, a limit stop body (18) that is connected with the valve needle (13) strikes against the second armature (10).

Abstract: A fuel injector has 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 comprises a body, an armature, a spring, and a spring stop. The body has an inlet portion, an outlet portion, and a passage disposed between the inlet portion and the outlet portion. The armature is disposed within the passage and is displaceable along the axis relative to the body. The spring is disposed within the passage and applies a biasing force to the armature. The spring has a first end disposed proximate the armature and a second end opposite from the first end. The spring stop is disposed within the passage and has a first and second portion. The first portion includes at least one projection engaging the passage. The at least one projection extends obliquely with respect to the axis and in a direction general toward the inlet portion.

Abstract: A fuel injector for use with an internal combustion engine. The fuel injector can include a tube assembly, an armature assembly, a working air gap, a coil, and a housing. The tube assembly has a longitudinal axis and includes a non-magnetic tube having a first end and a second end, and a pole piece disposed inside the non-magnetic tube intermediate the first and second ends. The armature assembly is disposed within the tube assembly between the pole piece and the first end. The armature assembly includes an end face resiliently biased away from the pole piece. The working air gap separates the end face and the pole piece when the end face is biased away from the pole piece. The coil is connectable to an electrical power source and operable to displace the end face toward the pole piece against the resilient bias on the armature assembly. The housing is positioned adjacent the working air gap and supports the coil on the tube assembly.

Abstract: A fuel injector (1), in particular for direct injection of fuel into the combustion chamber of an internal combustion engine, includes a valve-closure member (4) which forms a sealing seat together with a valve-seat surface (6) which is formed on a valve-seat member (5), and several injection orifices (7), each of which is connected with at least one spiral groove (37a) so that an outer edge (38) of the swirl grooves (37a) coincides in part with a circumferential edge (39) of the injection orifices (7) and the swirl grooves (37a) extend essentially perpendicular to a center line (41) of the injection orifice (7) associated with them.

Abstract: The fuel injection valve according to the present invention is a fuel injection valve adapted to inject a swirl flow of a high-pressure fuel from an injection port thereof. The injection port includes a fuel inlet portion and a fuel outlet portion. The fuel inlet portion has a cylindrical bore. In the fuel outlet portion, a circumference of an inlet thereof is joined to that of an outlet of the cylindrical bore, and the fuel outlet portion has a cross-sectionally elliptic chamfered part diverging from the inlet thereof to the outlet thereof. A depth of the chamfered part is set ¼ to 2 times as large as a diameter of the fuel inlet portion.

Abstract: The injector has a control rod controlled by the fuel pressure in a control chamber, and a nozzle having an injection chamber supplied with pressurized fuel for injection. The nozzle has at least one injection orifice normally closed by a pin connected to the rod and activated by the fuel pressure in the injection chamber. The control chamber has a pressurized-fuel intake conduit, and a fuel discharge conduit which is normally closed and is opened for a variable length of time depending on the amount of fuel to be injected. The pin and the rod, and/or the intake conduit and the discharge conduit, are so sized as to keep the pin and the rod hydraulically balanced in the maximum-lift position to open the orifice.

Abstract: The invention relates to a control module for fluid control in injection systems, having a valve body (2) in which valve needles (6, 24) of control valves (5, 17) are received. With these control valves (5, 17), the pressure buildup or pressure relief of control chambers (30) or nozzle chambers of injectors can be varied. The control valves (5, 17) in the valve body (2) are electromagnetically actuatable, and magnet coils are received in recesses (9, 20) of insert elements (19, 32) or in recesses (9) in the valve body itself.

Abstract: A fuel injector (10), including a housing (12), an armature assembly (14), an injector needle (16), a needle seat (18), a needle guide (20), and a orifice disc (22) containing one or more orifice metering pathways (24). The needle guide (20) contains a center guide bore (26) and a plurality of filtering passageways (28). The plurality of filtering passageways (28) are used to filter fuel passing through the needle guide (20) and induce swirl in the fuel to improve atomization.

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 fuel injector (1) for fuel injection systems of internal combustion engines, in particular for direct injection of fuel into the combustion chamber of an engine, includes an actuator (10), a valve needle (3) which is mechanically linked to the actuator (10) and is acted upon by a restoring spring (23) in a closing direction to actuate a valve closing body (4), which together with a valve seat face (6) forms a sealing seat, and it has a sleeve (24) which pre-stresses the restoring spring (23). The sleeve (24) is plastically deformable so that the cross section of a flow-through channel (46) of the sleeve (24) is variable by mechanical action.

Abstract: In a fuel injection nozzle, a nozzle body is provided inside with a guide hole having a second guide portion (cylindrical hole) for slidably holding a guide shaft of a needle and a seat surface axially below the second guide portion, with first injection bores opened to the seat surface and with second injection bores opened to an inner circumference of the second portion. The needle is provided at an end thereof with a circular seat contact coming in contact with the seat surface axially above the first injection bores and inside the guide shaft with a fuel passage through which fuel is supplied to a position axially above the seat contact. With the construction mentioned above, as the second guide portion is formed axially above the sack chamber and inner diameter thereof is larger than that of the sack chamber, the second guide portion is more easily formed at lower cost.

Abstract: A fuel injector (1) for fuel injection systems of internal combustion engines, in particular for direct injection of fuel into the combustion chamber of an engine, having an actuator (10), a valve needle (3) which is mechanically linked to the actuator (10) and is acted upon by a restoring spring (23) in a closing direction, for actuation of a valve closing body (4), which together with a valve seat face (6) forms a sealing seat, and having a sleeve (24) which pre-stresses the restoring spring (23). An adjusting body (40) is situated adjustably in the sleeve (24) so that a fuel amount flowing through the fuel injector (1) per unit of time is a function of the position of the adjusting body (40) in the sleeve (24).

Abstract: To realize spraying that is asymmetrical in the flow rate distribution of a sprayed fuel in order to improve the homogeneity of air-fuel mixture density during the air intake stroke injection for homogeneous combustion in an in-cylinder injection engine. By providing the exit portion of the fuel injection hole with the wall surfaces 204a, 204b, 205a, and 205b that are parallel to the central axis of the injection hole, further providing the periphery of the injection hole with an plurality of areas in which the flow of the fuel in the radial direction of the injection hole will be restrained, and an plurality of areas in which the flow of the fuel in the radial direction of the injection hole will not be restrained, and assigning a different size to each non-restraint area.

Abstract: 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 adjusting tube is disposed within the neck portion of the body. A spring is disposed within the neck portion of the body, the spring having an upstream end proximate to the adjusting tube and a downstream end opposite the upstream end. A filter and an O-ring retainer assembly are disposed proximate the upstream end. An armature having a lower portion is disposed within the neck portion of the body and displaceable along the axis relative to the body. The downstream end of the spring is disposed proximate to the armature, the spring applying a biasing force to the armature. A valve seal is substantially rigidly connected to the lower portion of the armature.

Abstract: An injector for an injection system of an internal combustion engine, with an injector head (1), a nozzle (13) for injecting fuel, a control unit (12) for controlling the transfer of fuel from the injector head (1) to the nozzle (13) and an actuator (6) for the mechanical activation of the control unit (12) in order to control fuel injection, an injector housing (2), which receives at least the control unit (12), being integrally formed on the injector head (1) at the bottom.