Abstract: An apparatus and method for injecting fuel into a cylinder of an engine which includes a fuel injector and a tip located on the fuel injector. The tip and fuel injector are located about a common longitudinal axis and includes a sac portion having a sac chamber, an outer sac surface, and at least one nozzle passage extending from an inner end located in the sac chamber to an outer end located at the outer sac surface, the at least one nozzle passage being at a fixed angle from the longitudinal axis along a central axis. The tip also includes an end surface located substantially adjacent to and parallel with the at least one nozzle passage and extending beyond the outer end of the at least one nozzle passage, and a curvilinear surface located on at least one of the end surface and the outer sac surface and configured such that a portion of fuel being injected through the at least one nozzle passage is directed to follow the curvilinear surface away from the central axis.

Abstract: Use of pump and line fuel injectors has become more common in fuel injection systems. While these fuel injectors do not typically include individual electrical actuators or fuel pressurization means, they still include a number of components that must be intricately machined in order for the fuel injector to perform as desired. The present invention is directed to reducing the number of machining steps, and therefore the cost, of producing such a fuel injector by utilizing a plastic component that can allow for a reliable and cost effective replacement of more intricately machined fuel injector components.

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

Abstract: 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: A fuel injector, especially an injector valve for fuel injection equipment in internal combustion engines, includes a piezoelectric or magnetostrictive actuator and a valve closing body, operable by an actuator with the aid of a valve needle, which cooperates with a valve seat surface to form a sealing seat, and a valve housing. The actuator is prestressed by a compression spring and, together with this, is surrounded by an actuator housing which is supported by fluid at both its ends.

Abstract: A fuel injection valve for internal combustion engines, having a valve body (1), in which a pistonlike valve member (5) is longitudinally displaceably disposed in a bore (3). The valve member (5) is surrounded, over at least part of its length, by a pressure chamber (7) that can be filled with fuel. On its end toward the combustion chamber, a valve seat (18) is embodied in the bore (3), on which seat the valve member (5) comes to rest with a valve sealing face (26) in a closing position, so that the pressure chamber (7) is disconnected from at least one injection opening (20) located downstream of the valve sealing face (18). In the end region of the valve member (5), a first annular groove (30) an a second annular groove (32), parallel to it and disposed axially toward the valve seat (18), are embodied, and the valve sealing face (26) is disposed between these two annular grooves (30; 32).

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

Abstract: A fuel injector for delivering fuel to a combustion space comprises a valve needle which is movable within a bore provided in a nozzle body and which is engageable with a seating to control the supply of fuel from the bore. The injector further comprises a return flow passage for permitting fuel to escape from the bore to a low pressure drain upon initial movement of the valve needle away from its seating. The injector may include a cover member which defines, together with the nozzle body, a part of the return passage for fuel through which fuel flows, in use, to reduce the temperature of the nozzle body.

Abstract: A fuel injector (1) is described, particularly for fuel injector systems of internal combustion engines, including an actuator (27), a valve needle (3) actuatable by the actuator (27) for actuation of a valve-closure member (4), which together with a valve-seat surface (6) forms a sealing seat, and a swirl device (15), having at least one swirl channel (18) through which fuel flows having a tangential component regarding a longitudinal axis (26) of the fuel injector (1). The axial position of a bypass disk (17), which is mechanically linked to a valve needle (3), determines a cross section of at least one bypass channel (19), which bypasses the at least one swirl channel (18) without a tangential component.

Abstract: A fuel injector having a fuel flow rate set by injector stroke is disclosed. The fuel injector includes a housing having a hollow passage and a seat disposed at one end of the hollow passage. A needle is slidably mounted in the hollow passage. The needle is operable between a first position wherein the needle engages the seat and a second position wherein the needle is disposed away from the seat. A first flow area is formed by a minimum frusto-conical area between the seat and the needle when the needle is disposed away from the seat. The fuel injector also includes an opening at the one end of the hollow passage proximate to the seat. The opening has a second flow area larger than the first flow area. A method for setting a gaseous fuel injector flow rate with injector stroke is also disclosed.

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: The invention relates to an injector for reservoir (common rail) injection systems for direct-injection internal combustion engines in which a nozzle needle which is surrounded by a nozzle chamber is guided in an injector housing. The inlet of the nozzle chamber is closable and openable via an externally actuatable closing element. From the nozzle inlet, inlets branch off to control parts. The inlets are embodied as throttle elements, one of which is closable on the outlet side via a closing element.

Abstract: A fuel injection valve having a valve body (3), in which a bore (7) with a pistonlike valve member (10) disposed in it is embodied, which valve member (10) is longitudinally displaceably in the bore (7) counter to a closing force and by its longitudinal motion controls at least one injection opening (22), through which fuel can be injected into the combustion chamber of the engine. A valve holding body (1) is braced axially against the valve body (3). An inlet conduit (12), which carries fuel at high pressure, extends through the valve holding body (1) and its contact face, embodied as a high-pressure sealing face (30), on the valve body (3) as far as the injection openings (22). The bracing of the valve holding body (1) against the valve body (3) is effected by means of a lock nut (5), which grips the valve body (3) and with a female thread (44) engages a male thread (42) embodied on the valve holding body (1).

Abstract: A pressure-controlled injector for injection systems for injecting fuel that is at high pressure into combustion chambers of internal combustion engines. A 3/2-way valve body is provided, which communicates with an inlet for fuel from a high-pressure collection chamber (common rail). The nozzle chamber of a nozzle needle can also be acted upon by fuel at high pressure. The stroke motion of the nozzle needle can be achieved via a hydraulic control chamber that can be pressure-relieved via a control line that has an externally actuatable control element.

Abstract: A fuel injection device includes a cylindrical valve housing, a valve needle disposed inside the valve housing and a ceramic heater disposed around the valve housing. The valve housing has a fuel inlet at an end, a first fuel passage, a second fuel passage, a nozzle hole at the other end and a valve seat. The valve needle has a hollow portion connected to the first fuel passage and a plurality of fuel apertures connecting the hollow portion and the second fuel passage, a head portion disposed to be seated on or unseated from the valve seat thereby intermittently injecting fuel through the nozzle hole. The ceramic heater is disposed around the valve housing down stream of the fuel apertures and upstream of the valve seat. Fuel vapor can be discharged upward though the fuel apertures.

Abstract: A fuel injector (1) including a first body and a second body, a capnut (9) which is in a threaded engagement with the first body and has a shoulder (10) for abutting against the second body to hold said first and second bodies together, a locating pin (7) for fixing the angular position of said first and second bodies relative to each other, a channel (14) arranged in the first and second bodies, a reciprocating needle (6) moveable within said first and second bodies for opening and closing the channel.

Abstract: The fuel injection valve (16) has an injection valve member (24), by which at least one injection opening (26) is controlled. The motion of the injection valve member (24) is influenced by a control valve (18), which has a control valve member (62) by which the pressure in a control pressure chamber (48) is controlled and which is movable by an adjusting force generated by a piezoelectric actuator (80) and in the process control the communication of the control pressure chamber (48) with a relief chamber (12). The control valve (18) has two valve seats (60, 74), spaced apart from one another in the direction of motion of the control valve member (62), with which seats the control valve member (62) cooperates, each with a respective sealing face (66, 69) disposed on it, so that the control valve member (62) has two closing positions, in which the control pressure chamber (48) is disconnected from the relief chamber (12).

Abstract: A fuel-injection valve includes a fuel-injection hole, a valve element, a valve seat, a force-applying member applying force to the valve element in a direction of motion of the valve element, and a drive unit applying force to the valve element in an opposite direction of the force applied by the force-applying member. A secondary oscillation system is provided which interacts with a primary oscillation system including the valve element and the force-applying member. The phase angle of force applied to the primary oscillation system by the secondary oscillation system is staggered from that of force applied to the primary oscillation system, which is other than the force applied to the primary oscillation system by the secondary oscillation system. Thus, bouncing of the valve element during opening and closing of the valve is reduced to achieve very accurate fuel-injection control.

Abstract: An high pressure seal comprises a tube with a first end adapted to fit into a first bore of a first mating part and a second end adapted to fit into second bore of a second bore of a second mating part and allow fluid communication between the first bore and the second bore. The seal is expandable radially about an axis to form a seal between the first and second mating parts.

Abstract: A fuel injector for a fuel injection system of an internal combustion engine includes an energizable actuator having a valve closure element actuable by the actuator by a valve needle, which coacts with a valve seating surface to form a sealing fit and which is held in the closed position by a return spring. The actuator acts on the valve needle via a sleeve-shaped needle driver that is separate from the valve needle, which is arranged in an axially movable fashion with respect to the needle driver, and a collar of the needle driver is engageable behind a needle collar of the valve needle at the end facing away from the return spring.

Abstract: Disclosed is a fuel injection valve having at least two valve body parts, which each contact one another at a respective contact face and pressed against one another perpendicular to the contact face by a clamping device. An inflow conduit for fuel formed in both valve body parts passes through the contact faces, and a high fuel pressure prevails in it. At least one radially widened portion is embodied in the inflow conduit, near the contact face of at least one valve body part, so that this radially widened portion, as a result of the fuel pressure in the inflow conduit, undergoes an expansion in the axial direction. As a result, the region of the contact face surrounding the inflow conduit is pressed against the contact face of the contacting valve body part, so that the contact pressure of the contact faces increases, whereby the inflow conduit is thus better sealed off, and the force of the clamping device can be reduced.

Abstract: A fuel injector performs main fuel injection by raising fuel pressure in a nozzle chamber to lift a check valve member to a fully open position, and performs preinjection or microinjection by operating a solid state motor to lower a check stop so that when fuel pressure in the nozzle chamber is raised the check valve member is limited to lift a much smaller distance.

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: 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: An injector for injecting fuel into the combustion chambers of a direct-injection internal combustion engine includes a control part which is received movably in the housing of the engine. The control part opens and closes the inlet to an injection nozzle at a seat face. In the control part, there is an inlet throttle, which acts upon the control chamber and is in communication with the inlet from the high-pressure collection chamber. In the housing of the injector, one region of the control part is coupled with a nozzle needle, via a further control chamber.

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.

Abstract: A fuel injector (1), particularly an injection valve for fuel-injection systems of internal combustion engines, has a piezoelectric or magnetostrictive actuator (16). By way of a valve needle (5), the actuator (16) actuates a valve-closure member (4), which interacts with a valve-seat surface (7) to form a sealing seat. The actuator (16) has a tubular design, and encircles a transmission piston (19) that acts on a hydraulic transmission device (27).

Abstract: A closed needle injector assembly and method are provided which effectively extending injection duration and improving fueling accuracy at part load conditions, providing a low quantity detached pilot injection at all operating conditions and controlling the duration of, and dwell time between, the pilot injection and one or more higher flow rate primary injections independent of fuel injection pressure. The closed needle injector assembly includes first and second needle valve elements, respective control volumes and a single injection control valve to control the movement of the needle valve elements. A sequencing device is mounted on the injector to permit movement of only the inner needle valve element to define a low fuel injection rate event and permit selectively, controlled movement of both the inner and outer needle valve elements to open positions to define a subsequent primary fuel injection event.

Abstract: An improved closed nozzle injector assembly for injecting high pressure fuel into the combustion chamber of an engine is provided which includes a first needle valve element associated with a first set of injector orifices, a first needle valve control device for controlling the opening and closing of the first needle valve, a second needle valve associated with a second set of injector orifices and a second needle valve control device for controlling the opening and closing of the second needle valve. Each needle valve control device includes a control volume positioned at one end of the respective needle valve, a control volume charge circuit for supplying high pressure fuel to the respective control volume and the respective injection control valve for controlling the flow of high pressure fuel from the respective control volume to a low pressure drain thereby controlling the movement of the respective needle valve.

Abstract: A fuel injection valve having a valve retaining body (1), which has a longitudinal axis (2) and in which a central spring chamber (5) is embodied. In this spring chamber (5), a closing spring (6) is disposed, which transmits a closing force to a valve member (30), which valve member (30) cooperates with a valve seat (32) for controlling at least one injection opening (36). In the wall of the spring chamber (5), an inlet conduit (3) extends parallel to the longitudinal axis (2) of the valve retaining body (1), and by way of this conduit, fuel at high pressure can be delivered to the at least one injection opening (36).

Abstract: A fuel injection nozzle controls the flow of pressurized fluid through a nozzle opening. The fuel pump includes a fuel valve under the control of an electronic engine control module to effect sequential ON/OFF cycles for the fuel valve to establish a pilot fuel delivery pulse through the nozzle followed by a full fuel delivery injection pulse, a damping flow passage in the nozzle, and a flow damping pin in the opening through which fuel flows as the needle valve displaces fuel, the damping pin being biased toward an injection nozzle closed position by a needle valve spring whereby a distinct pilot pulse of fuel is delivered through the nozzle in advance of delivery of a full injection pulse, the valve spring being in a spring chamber that is pressurized to effect a rapid needle valve closure at the end of the fuel delivery pulse.

Abstract: A fuel injection valve for internal combustion engines, having a valve body in which a valve member is disposed, which valve member changes into a spring plate, which is disposed in a spring chamber that receives the closing spring provided with a valve stop face on an end face. A control piston is provided defining a hydraulic control chamber, which control piston protrudes into the spring chamber, whose end face toward the combustion chamber forms a stroke stop face. As a function of pressure in the control chamber, the control piston can be moved counter to the closing force of a restoring spring from a first stroke position, remote from the valve member, toward the valve member into a second stroke position, where the control piston limits the maximum opening stroke (h) of the valve member to a partial stroke (hT).

Abstract: A fuel injector, in particular, an injector for fuel injection systems of internal combustion engines, having an actuator, which cooperates with a valve needle (34, 51, 73), has a first valve closure member (35, 52) that is arranged on the valve needle (34, 51, 73), the valve closure member cooperating with a first valve seat surface (33, 53) on a valve body (32, 50) forming a first sealing seat (36, 54). A second valve closure member (38, 55, 75) cooperates with a second valve seat surface (40, 56) in the valve seat body (32, 50) forming a second sealing seat (41, 57). The valve needle (34, 51, 73), or the first valve closure member (35, 52), has a limit stop, against which, after a partial stroke (h1) of the valve needle (34, 51, 73), a counter limit stop of the second valve closure member (38, 55, 75) strikes, lifting the second valve closure member (38, 55, 75) from the second sealing seat (41, 57) in response to a further stroke of the valve needle (34, 51, 73).

Abstract: The control space of the fuel injection valve is delimited, on the one hand, by the piston of the injection-valve member, on the other hand by the slide-valve body and circumferentially by the sleeve. Both the double-acting piston and the slide-valve body are guided in a narrow sliding fit on the sleeve. The throttle passage runs through the slide-valve body and is flow-connected permanently to the control passage in the control body. The throttle inlet leads from the high-pressure space into the control passage. The latter, on the side facing away from the slide-valve body, can, via a pilot valve, be connected to a low-pressure space and be separated again from the latter. The connection of the control passage to the low-pressure space leads to a pressure drop in the control space, with the result being that the injection-valve member moves in the direction of the slide-valve body and releases the injection nozzles.

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

Abstract: The invention relates to a metering valve for controlling the delivery of fuel from a high-pressure fuel line (1) to an injection nozzle (6) of an internal combustion engine, having one connection for the high-pressure fuel line (2), one connection for the injection nozzle (6), and one connection for a leak fuel line (13).

Abstract: In a fuel injection system for internal combustion engines, having two control valves (15, 34), provided for controlling the injection event, whose valve bodies each have one magnetically attractable armature (41, 45), and having a common magnet coil (40) for the two armatures (41, 45), in a first current stage of the common magnet coil (40), only one armature (41), and in a higher second current stage both armatures (41, 45), are each attractable counter to the action of a closing force. Thus with only a single magnet drive mechanism, two valve functions can be switched via two exciter currents of different magnitudes.

Abstract: An EMD-type injector is provided with a spring seat in which the juncture between the head and the stem of the spring seat is formed as an undercut groove within specified shape parameters.

Abstract: A fuel injector device having a blowback valve disposed in the injector body, the blowback valve having a first portion and a second portion, a fuel passage being disposed through the first and second portions, a closure member being disposed in the fuel passage and movable in a first direction and a second direction, the closure member permitting a predetermined volume of fuel flow in the second direction before the closure member moves to the second position. The invention also include a method to control the fuel flow through an injector by providing a body having a first portion and a second portion, a fuel passage extending through the portions and a closure member movable in the fuel passage between a first position and a second position, and the closure member permitting a predetermined volume of fuel to flow in one direction before the closure member moves to the second position.

Abstract: A fuel injector seat for a fuel injector assembly, and more particularly for a high-pressure fuel injector assembly, having a number of features for minimizing the formation of combustion chamber deposits on the seat, providing a selected finish on a needle-sealing portion, and reducing sac volume. These features include positioning a transition portion between the needle-sealing portion and an orifice portion, positioning a sharp edge at the outlet of the orifice portion, and applying a coating to certain surfaces of the seat. This invention also relates to a fuel injector seat and method of manufacturing the fuel injector seat, and a method of evaluating when the transition portion is required between the orifice and needle-sealing portions for a particular seat arrangement.

Abstract: A fuel injection valve for internal combustion engines, having a valve body that has a guide bore, in which a valve member is axially displaceably guided for controlling an injection cross section, and that is braced with its end face remote from the combustion chamber axially against a valve holding body via an intermediate disk, and a pressure chamber, formed by a cross-sectional enlargement of the guide bore, is provided in the valve body and can be filled with high fuel pressure via a pressure conduit that penetrates the valve body, the intermediate disk, and the valve holding body. The portion of the pressure conduit extending within the valve body is embodied as an oblique bore, which has an angle of inclination of between 15 and 35° to the longitudinal axis of the fuel injection valve.

Abstract: A fuel injector nozzle is disclosed which solves a long-standing problem in the industry of reducing polluting engine emissions. The nozzle has a needle which alternately blocks and leaves open spray holes for delivering fuel to the combustion chamber. The needle is received in a cavity where the injector needle seats. Machining the seat of the cavity causes a sac at the nozzle tip where the unburned fuel causes the polluting emissions. Minimizing the sac volume minimizes the polluting emissions. The present invention discloses a nozzle formed with a seat having an apex located at the bottom of a sac. The design of the present minimizes the sac volume and the sac volume is closer to zero volume than any prior design.

Abstract: A fuel-injection valve includes a fuel-injection hole, a valve element and a valve seat for opening and closing the fuel-injection hole, a force-applying member for applying force to the valve element in a direction of motion of the valve element, and a drive unit for applying force to the valve element in the direction opposite to that of the force applied by the force-applying member; wherein a secondary oscillation system, which interacts with a primary oscillation system including the valve element and the force-applying member, is added to the primary oscillation system, and the phase angle of force applied to the primary oscillation system by the secondary oscillation system is also staggered from that of force applied to the primary oscillation system, which is other than the force applied to the primary oscillation system by the secondary oscillation system, whereby the bouncing of the valve element during opening and closing of the valve is reduced, which in turn makes it possible to achieve very acc

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

Abstract: A fuel injector, especially an injector for fuel injection systems in internal combustion engines, has a piezoelectric or magnetostrictive actuator. The actuator, via a valve needle, activates a valve-closure member, which cooperates with a valve seat surface to form a sealing seat. The actuator can be actuated in a first direction of motion. In contrast, the valve-closure member can be moved by the valve needle in a second direction of motion (40) that is essentially perpendicular to the first direction of motion.

Abstract: A high-pressure fuel system for internal combustion engines, having a housing that contains two high-pressure bodies. The high-pressure bodies rest with contact surfaces at least indirectly against each other and are pressed against each other by means of a tensioning device. A supply conduit is embodied in the high-pressure bodies, which carries highly pressurized fuel and passes through the contact surfaces of the two high-pressure bodies. A sealing film is disposed between the two high-pressure bodies, which encompasses the passage of the high-pressure conduit and thus assures a favorable seal.

Abstract: A fuel injection valve has a valve seat element having a fixed valve seat. A valve closure element coacts with the valve seat to open and close the valve. The valve seat element possesses an outer enveloping surface that is equipped with a coating made of a material other than the material of the valve seat element, or with an adhesive, by way of which a hydraulically sealed join can be achieved between the valve seat element and a valve seat support that receives the valve seat element. The fuel injection valve is suitable in particular for use in fuel injection systems of mixture-compressing spark-ignited internal combustion engines.

Abstract: A fuel injector comprising a valve needle, engagable with the seating to control fuel flow through a fuel outlet, the valve needle having a thrust surface oriented such that the application of fuel under pressure thereto applies a force to the valve needle urging the valve needle away from the seating. The fuel injector also comprises a valve member for controlling fuel pressure within a control chamber and a piston member slidable within a bore and defining, with the bore, the control chamber. The piston member is exposed to fuel pressure within the control chamber and is arranged to transmit a force applied by the fuel pressure to the valve needle. The piston member has an effective surface area exposed to the fuel pressure which is greater than that of the thrust surface so as to urge the valve needle towards the seating.

Abstract: A unique variable orifice electronically controlled common variable rail injector (VOECCRI) for use in internal combustion engines characterized in part by the provision of injection ports or orifices along a tip portion of the nozzle housing having an internal cylindrical surface, and which cooperates in sealing and sliding relation with an internal hollow fuel needle having a cylindrical outer surface. In seating, the needle seats against a frusto-conical seat carried in the closure sac at the lower tip of the assembly, whereby leakage is controlled and precise opening of the injection orifices can be effected and programmed, as desired.

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 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.