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

Abstract: A high-pressure fuel system including a housing having first and second high-pressure bodies (3, 5), which contact one another at a contact face. A high-pressure chamber in the housing passes through the contact face, and at least intermittently a high fuel pressure is present in the chamber (23). A wall part having a longitudinal axis surrounds the housing at least in the region of the contact face, so that a leak fuel chamber (32) is formed between the wall part and the housing which chamber is sealed off from the outside.

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

Abstract: A controller for controlling a needle valve of a spring closing type fuel injector includes a fluid assist selectively exerting a force on the needle valve, the force acting in cooperation with a bias exerted by a return spring on the needle valve to effect a relatively low valve opening pressure of the needle valve and relatively very high valve closing pressure. A spring closing type fuel injector and a method for controlling a needle valve of a spring closing type fuel injector are further included.

Abstract: Electrically controlled fuel injection systems should be able to operate at low voltage. In order to operate an electrically controlled fuel injection system at low voltage, the voltage available to an electrical actuator is monitored. The electrical actuator is coupled to a valve positioned within a passageway in which high pressure actuation fluid flows to and from an hydraulically actuated device, such as a fuel injector and/or an engine brake. If the voltage available to the electrical actuator falls below a predetermined voltage, the pressure differential across the valve is reduced. Although the principal application of the present invention is in the fuel injection system, the present invention has application in any electrically controlled fluid system at low voltage.

Abstract: An improved filter assembly for a solenoid-actuated fuel injector having a fuel-resistant porous filter element in a filter retainer tube for disposition in the fuel tube of the fuel injector. Fuel flow through the filter element is axial. The filter retainer tube replaces the calibration tube in a prior art fuel injector, also acting as a seat for the injector spring and being positioned axially within the fuel tube by a press-fit calibration ring. The retainer tube is preferably formed of glass-filled nylon, and the filter element is preferably formed by injection molding of an open-cell polyamide foam. By selecting the porosity and flow characteristics of the filter element material in known fashion, the length and diameter of the filter element may be minimized, permitting reduction in the length and diameter of the fuel tube and also the size and cost of the actuating solenoid assembly.

Abstract: A fuel injection valve for an internal combustion engine which includes an axially moveable needle-like injection valve member 10 mounted in a tubular housing 2. A control element 22 with a control passage 25 is mounted in the upper end portion of the housing, and a valve element 21, 41, 46 is mounted for movement below the control element. A control chamber 20 is formed below the valve element, and a control piston 18 which is formed at the upper end of the valve member 10 bounds the lower side of the control chamber. A throttle passage 26, 42, 47 in the valve element is connected via a throttle constriction between the control passage 25 in the control element 22 and the control chamber 20. A throttle inlet 33, which is formed in the valve element 21 or in a sleeve 19 which laterally bounds the control chamber, is connected between a high pressure chamber 9 in the housing and the control chamber 20 without passage through an intermediate throttle point.

Abstract: An injector for high-pressure injection of fuel in self-igniting internal combustion engines includes an actuator valve for opening and closing the injector; a nozzle needle, which in the closed state of the injector closes at least one injection opening; a metering valve, which establishes a hydraulic communication between the actuator valve and the relief chamber of the injector; a pressure holding device, which serves to maintain a static pressure required for the metering valve; and a first control quantity line for control quantities that flow via the actuator valve, and a second control quantity line for control quantities that flow via the metering valve. The pressure holding device dynamically separates the control quantities of the metering valve from the control quantities of the actuator valve by means of a hydraulic fluctuation damper.

Abstract: Electrically-operated dispensing modules capable of dispensing small volumes of a viscous liquid at high operating frequencies and reproducibly among successive dispensed volumes of viscous liquid without the occurrence of stringing. The dispensing module may include a flux element having a portion effective for interrupting circumferential electrical current paths. In another aspect, an end face of a pole piece of the dispensing module may include one or more non-magnetic spacer elements that prevent contact between the pole piece and armature when the dispensing module is opened.

Abstract: In an injection hole plate of a fuel injection device, injection holes are arranged about a circle. Fuel injected from the injection holes forms a flat sector-shaped spray. The intervals between adjacent injection holes are approximately equal to each other, while the diameters of the injection holes are equal to each other. An injection hole is positioned on an imaginary plane, which contains the central axis of the sector-shaped spray along the injection direction and is orthogonal or approximately orthogonal to the sector-shaped spray. The injection holes, away from the imaginary plane in this order, are symmetric with respect to the line of intersection of the injection hole plate and the imaginary plane. The farther each injection hole is away from the imaginary plane, the larger an angle of gradient of the injection hole with respect to the imaginary plane becomes.

Abstract: A valving assembly for a motor vehicle includes a hard, lubricious and chemically inert coating of graphitic carbon. The coating may include a metal. Preferred metals include chromium or other transition metals.

Abstract: In a fuel injection valve, a substantially arc-shaped chamfered portion in a substantially arc shape of cross section is formed on an edge of an inner wall portion of each opening end of a corresponding nozzle hole of a nozzle plate to further expand a whole diameter of an injection stream of fuel passed through a plurality of obliquely penetrated nozzle holes. In a manufacturing method for the nozzle plate, circulating a fluid mixed with an abrasive through each nozzle hole is carried out to polish opening ends of the respective nozzle holes which are faced against the external of the fuel injection valve in a form of substantially arc shape of cross section with the abrasive. Furthermore, grinding the respective major surfaces of a punched plate material which becomes the nozzle plate together with vicinities to the respective opening ends of the nozzle holes is carried out.

Abstract: An apparatus and method of compensating for thermal expansion and tolerance variations (wear, brinelling, mounting distortion) in a fuel injector is provided. The apparatus includes a magneto-hydraulic thermal expansion compensator containing magnetically-active fluid positioned in operative contact with the fuel injector actuation element. A electromagnetic coil is provided proximate the magneto-hydraulic compensator. Magnetic flux generated by the electromagnetic coil causes the viscosity of the magnetically-active fluid within the magneto-hydraulic compensator to increase, causing the magneto-hydraulic compensator to become substantially rigid during actuation of the fuel injector.

Abstract: An injection valve for an internal combustion engine, including a valve control piston, a valve control chamber with an inlet throttle and an outlet throttle for actuating the valve control piston, a valve control unit, actuated by means of a piezoelectric actuator unit for controlling the valve control chamber, which valve control unit is embodied in valvelike fashion and has a valve closing member cooperating with at least one valve seat. To assure a high closing speed of the valve closing member, the valve closing member and the at least one valve seat are disposed in the valve control chamber.

Abstract: A fuel injector for fuel injection systems of internal combustion engines includes a nozzle body. At a downstream end of the nozzle body at least one spray discharge opening is arranged. A sealing element is arranged on the nozzle body for sealing with respect to a contiguous component. At least one circumferential sealing ridge that forms a press fit with a contiguous component is arranged on the nozzle body as the sealing element.

Abstract: A canister purge valve, and an emission control system, for regulating a fuel vapor flow between a fuel vapor collection canister and an intake manifold of an intake manifold of an internal combustion engine. The canister purge valve includes a body having a passage extending between a first port and a second port, a seat defining a portion of the passage, a member movable with respect to the seat, and an actuator that moves the member. The first port of the body is adapted to be in fluid communication with the fuel vapor collection canister, and the second port of the body is adapted to be in fluid communication with the intake manifold of the internal combustion engine. The member moves generally along an axis between a first configuration that prohibits fuel vapor flow through the seat and a second configuration that permits fuel vapor flow through the seat. And the actuator includes a piezo-electric element that moves the member from the first configuration to the second configuration.

Abstract: A fuel injection valve having a valve retaining body, which has a longitudinal axis and in which a central spring chamber is embodied. In this spring chamber, a closing spring is disposed, which transmits a closing force to a valve member, which valve member cooperates with a valve seat for controlling at least one injection opening. In the wall of the spring chamber, an inlet conduit extends parallel to the longitudinal axis of the valve retaining body, and by way of this conduit, fuel at high pressure can be delivered to the at least one injection opening. The cross section of the inlet conduit has a greater length in the circumferential direction than in the radial direction, so that the wall region between the inlet conduit and the spring chamber, or the outer jacket face of the valve retaining body, is larger than in the case of an inlet conduit with the same size of cross-sectional area and a circular cross-sectional contour.

Abstract: A fuel injector for fuel injection systems of internal combustion engines includes a valve needle and a valve closing body, which is operationally linked to it and cooperates with a valve seat face situated in a valve seat body to form a sealing seat. Upstream from the sealing seat there is at least one swirl channel, which has a tangential component relative to the longitudinal axis of the fuel injector. An axial channel, which is formed between the valve closing body and the guide recess of the valve seat body, has an axial component relative to the longitudinal axis of the fuel injector, the axial channel being formed between the guide recess and at least one flattened area on the valve needle.

Abstract: A temperature compensated actuator device comprises a piezoelectric stack having first and second ends along a central axis and having a first thermal expansion coefficient; and a compensator arranged on one end of the piezoelectric stack. The compensator comprises a first member in form of a cylinder; a second member in form of a piston plate wherein the first member and the second member are arranged movably along the axis with respect to each other and define a hollow space between them; and a compensation member having a thermal expansion coefficient higher than the first thermal expansion coefficient for filling the hollow space.

Abstract: A method for controlling a fuel injector provided with an electrically operated electomagnetic actuator in such a manner as to open the injector for a determined injection time; the method providing that the injector be operated with a first current waveform if the injection time is greater than a predetermined threshold value, and that the injector be operated with a second current waveform if the injection time is less than the predetermined threshold value; both the current waveforms have an identical initial portion, during which the current passing through the injector is caused to rise until it reaches a peak value, which is maintained by cyclic switching of the voltage applied to the injector between two different values.

Abstract: An injector for a fuel injection system for internal combustion engines is proposed, whose system pressure supply is integrated with the injector. This results in a simple design with at the same time a low requirement for driving capacity on the part of the high-pressure pump for supplying system pressure.

Abstract: A moving iron core that reciprocates in axial direction in response to a fuel injection signal is provided with a radial recess of a predetermined width and a predetermined depth on the outer circumference at a position facing a magnetic characteristic change portion produced in a yoke due to heat generated when a sleeve and the yoke are welded together. As a result, it is possible to suppress the variation in injection quantity characteristic of the products caused by the magnetic characteristic change portion of the yoke due to the heat generated at the time of welding the sleeve and the yoke together.

Abstract: A coupling device having a body portion is adapted to be mated with an end cap assembly of a fuel injector. The body portion has a connecting portion spanning between a first electrical connector and a second electrical connector at opposing ends thereof. A first set of conductive leads connects the first electrical connector to a first set of solenoid wires and a second set of conductive leads connects the second electrical connector to a second set of solenoid wires. The first set of conductive leads spans the connecting portion to connect the first electrical connector and the first set of solenoid wires. An end cap and coupling device as well as a fuel injector assembly using the coupling device is provided.

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 fuel injector includes a housing, a passageway, a coil assembly, a seat, and a closure member. The housing extends along a longitudinal axis between an inlet and an outlet, and fuel flows through the passageway from the inlet to the outlet. The coil assembly is disposed proximate the inlet of the housing, and the seat is disposed proximate the outlet of the housing. The closure member is disposed in the housing and is movable along the longitudinal axis between a first position, which prohibits fuel flow, and a second position, which permits fuel flow. The closure member includes a magnetic member, a needle, and a tubular member. The magnetic member is adapted to cooperate with the coil assembly to move the closure member from the first position to the second position. The needle member occludes the seat in the first position of the closure member. The tubular member couples the magnetic member to the needle member, and defines a portion of the passageway.

Abstract: A fuel injection system includes a fuel pressurizer that may be cam actuated. The fuel injection system also includes an electronically controlled spill valve and an electronically controlled needle control valve. The energization of the electronically controlled spill valve closes a fuel pressurization chamber to a drain passage to allow fuel pressure in the fuel injector to build to injection levels. The electronically controlled needle control valve controls whether high or low fuel pressure is applied to a closing hydraulic surface associated with a direct control needle valve. The fuel injection system includes a hydraulic circuitry that allows for fuel injection to occur by either maintaining the electronically controlled needle control valve in a de-energized state, or by de-energizing the same, after fuel pressure within the fuel injector has built to injection levels.

Abstract: A dual component injector, especially for internal combustion engines, has a nozzle body, which has a nozzle outlet, and a valve needle for opening and closing the nozzle outlet. A first feed channel is used for supplying a first fluid to the nozzle outlet, and a second feed channel is used for supplying a second fluid to the nozzle outlet. Optionally, a fluid chamber, which is located in the nozzle body, is connected to the nozzle outlet. The second feed channel is connected to the fluid chamber or to the first feed channel via at least two bored holes. The bored holes open out in the fluid chamber or in the first feed channel in such a way that the second fluid produces a swirling flow pattern in the fluid chamber or in the first feed channel.

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

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

Abstract: The invention relates to portable dispensing means having a spray head (1) and a spray material storage canister (2), the spray head (1) and the canister being attachable to one another and also being subsequently detachable from one another, the dispensing means being formed such that when it is in use it can be sert so that spray material within the canister can move into the spray head and pass from the spray head to an atmosphere outside of the dispensing means in the form of a spray, the dispensing means being formed such that when it is in a normal in-use orientation and is activated the spray can proceed from the spray head in a substantially vertical or upward path of travel.

Abstract: A fuel injection system for an internal combustion engine with direct injection includes a fuel injection device which can inject the fuel directly into a combustion chamber of the engine has a valve element bordering on a work chamber, and the position of the valve element depends on the pressure in the work chamber. A pressure booster piston borders on a control chamber on one side and on a high-pressure chamber on the other. A fuel supply can subject the control chamber to various pressures. The pressure booster piston is integrated with the fuel injection device and that the high-pressure chamber is integrated with the work chamber.

Abstract: A fuel injection device of an internal combustion engine includes a housing with an injection region. The housing contains a recess in which two valve elements are disposed. The inner valve element is shorter than the outer valve element. A loading device at least sometimes acts on the inner valve element in the opening direction. A control piston cooperates with the inner valve element. It has a pressure surface, which delimits a control chamber and whose force resultant points in the closing direction. The loading device exerts an approximately constant opening force on the inner valve element. The fluid pressure in the control chamber can be temporarily reduced.

Abstract: The jacket surface of the piezoelectric actor body (1) is surrounded by an injector housing (9), maintaining an intermediate space and is cooled by direct contact with an inert fluid which does not conduct electricity (6), forming a fluid space in the injector housing (9) which is filled with fluid except for an air reservoir (7). The volume of the air reservoir (7) is at least large enough to allow the thermal expansion of the heat coupling fluid (6) which occurs at the highest operating temperature of the actor body (1).

Abstract: A fuel injector that includes a housing, a seat, a metering disc and a closure member. The metering orifices can be located on a first virtual circle greater than a second virtual circle as defined by a projection of a sealing surface converging at a virtual apex projected on the metering disc. The metering disc can be dimpled to increase the spray angle. Various parameters can be utilized to achieve a desired cone size and spray angle. A method of controlling spray targeting of a fuel injector is also described.

Abstract: A fuel injector, in particular for the direct injection of fuel into a combustion chamber of an internal combustion engine, includes a valve needle that has at its injector end a valve-closure member that works together with a valve-seat surface formed on a valve-seat member, to form a sealing seat. The fuel injector also includes at least one swirl duct; a swirl chamber formed on the valve-seat member, and a plurality of injection openings that open out from the swirl chamber, through which the fuel, provided with a swirl, is simultaneously injected. The at least one swirl duct is formed in the valve-seat member or in a swirl disk adjacent to the valve-seat member.

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

Abstract: A fuel injector, in particular for direct injection of fuel into the combustion chamber of an internal combustion engine, is equipped with a valve-closure member which together with a valve-seat surface that is formed on a valve-seat body constitutes a sealing seat, with an ejection orifice and with a swirl module. The swirl module incorporates a plurality of tubular hollow bodies which are disposed parallel to one another in a cluster and which impart turbulence to the fuel flowing towards the ejection orifice through the fuel ducts formed in the hollow bodies.

Abstract: When a needle is separated from a needle seat, upward pressure of pressurized fuel is applied to downward pressure receiving surface outer portion and an annular downward pressure receiving surface inner portion. A bottom portion side extending portion is provided, which extends in a direction of a longitudinal axis K—K from a needle bottom surface inner portion, which is a portion of a bottom surface of the needle on an inner side of the annular seal, into a sack beyond a nozzle chamber. When the needle is separated from the needle seat, an area of the downward pressure receiving surface inner portion to which the upward pressure of the pressurized fuel is applied is decreased by a cross sectional area of the bottom portion side extending portion.

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

Abstract: A fuel injector for the direct injection of fuel into the combustion chamber of a mixture-compressing internal combustion engine having external ignition, includes a valve housing formed from a nozzle body, and a sealing ring which seals the fuel injector from a cylinder head of the internal combustion engine. In the mounted state, a radial extension of a stamping sleeve that is disposed on the intake side of the sealing ring acts upon the sealing ring in such a way that the axial extension of the sealing ring is reduced in favor of the radial extension of the sealing ring relative to the unstrained state of the sealing ring.

Abstract: A common rail fuel injection system addresses three basic issues involving all common rail fuel injection systems. These include high performance, low variability and high efficiency. These issues are addressed by combining pressure intensification with a three way needle control valve, which exhibits substantial leakage only durring a brief instant when the valve is moving between seats. A quick acting needle control valve tightly coupled to a responsive direct control needle valve, as modified by relative timing with a flow control valve, can produce a wide variety of fuel injection rate shapes, including up to five or more discrete injections per engine cycle.

Abstract: A fuel injector, in particular a fuel injector for fuel-injection systems of internal combustion engines, having a piezoelectric or magnetostrictive actuator, has a coupler with a master piston and a slave piston which are connected to a pressure chamber. The pressure chamber is filled with an hydraulic fluid, and a coupler spring presses apart the master piston and the slave piston. The pressure chamber is connected to an actuator chamber via a check valve whose blocking direction faces the pressure chamber. The actuator chamber is sealed from a fuel chamber via a movable membrane.

Abstract: A fuel injector includes a seat, a movable member cooperating with the seat, and an orifice plate. The metering orifice disc includes a member having first and second generally parallel surfaces, and an orifice penetrating the member. The first surface generally faces the seat and represents the fuel entry side. The second surface faces opposite the first surface and represents the fuel exit side. The orifice is defined by a wall that couples the first and second surfaces. And the wall includes first and second portions. The first portion is spaced from the first surface and extends generally parallel to a longitudinal axis. The second portion couples the first portion to the first surface and extends at a first oblique angle that varies with respect to the first surface.

Abstract: A fuel injection device is so constructed that fuel fed from a pressure storage chamber to a valve housing (11) with a nozzle (14) is led to a needle valve back pressure chamber (16) through a groove (21) provided on the peripheral surface of a needle valve (17); a fuel pressure in the back pressure chamber (16) is controlled by opening and closing a pressure regulating port (13) provided in the valve housing by a pilot valve (38) so as to move the needle valve, whereby the nozzle is opened and closed. The pressure regulating port is opened and closed by a drive control of the pilot valve with a valve drive unit by means of elongation and contraction of the magnetostrictive rods attributable by the action of an external magnetic field. The magnetostrictive rods, consisting of first and second magnetostrictive rods (34 and 35), are axially arranged side by side in parallel to the pilot valve.

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

Abstract: An electromagnetically actuatable valve having a longitudinal valve axis, an electromagnetic circuit, a movable actuating member that cooperates with a fixed valve seat for opening and closing the valve, and an outlet opening that is configured downstream of the valve seat. The actuating member is configured in a bowl, trough, or saucer shape, having an actuating leg and a supporting leg that is configured to be substantially perpendicular to the former. The actuating leg, as a movable part of the actuating member, cooperates with an upper layer of atomization disk to form a sealing valve. The valve may be used as a fuel injector in an internal combustion engine, such as in a mixture-compressing, spark-ignition internal combustion engine.

Abstract: A stroke-controlled valve as a fuel metering device of an injection system for internal combustion engines has a valve body with a valve seat and a valve needle which is actuatable in the valve body counter to the resistance of a valve needle restoring spring and which has a sealing edge that cooperates with the valve seat. A coupling body with a greater mass than the valve needle is disposed in the valve body, in the axial extension of the valve needle, and is movable coaxially to the valve needle and is actuatable by the valve needle during the opening stroke of the valve needle.

Abstract: The injection valve has a housing, a nozzle body and a clamping nut connected to the housing that contacts the nozzle body with first contact surface (9) acting on a second contact surface (10), whereby the clamping nut clamps the nozzle body against the housing. The first or second contact surface has a curvature (24) towards the second or first contact surface and the both contact surfaces are in contact in the area of the curvature.

Abstract: The present invention is directed to an electrical connector that attaches a fuel injector assembly to a vehicle control assembly. The electrical connector comprises a plastic molded body having two integrally formed portions, a base portion and a stem portion, and an electrical contact extending through the body from the stem portion to the base portion. The base is inserted into the fuel injector assembly with the electrical contact engaging a corresponding contact within the fuel injector assembly. Similarly, the electrical contact in the stem portion of the connector is attached to a corresponding contact of a control assembly, which provides the electrical signals to operate the fuel injector. The base portion includes a metallic sleeve that extends between its sidewalls and cooperates with a locking pin that is inserted through openings in the fuel injector assembly to lock the two components together.

Abstract: A fuel injector includes a magnetic coil, which cooperates with an armature which, together with a valve needle acted upon by a restoring spring, forms an axially movable valve part. A valve-closure member which forms a sealing seat together with a valve-seat member, is provided at the valve needle. Furthermore, the fuel injector includes an inner pole and an outer pole which form a magnetic circuit together with the magnetic coil, and a central fuel supply. A sleeve is situated in the central fuel supply of the fuel injector in such a way that a flow route of the fuel through the fuel injector is formed such with respect to length and diameter that the frequency of natural oscillations which are excited by the fuel flowing through the fuel injector, is adjusted to the closing intervals of the fuel injector.