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

Abstract: A device for injecting fuel into the combustion chambers of an internal combustion engine, with an injector enclosed by an injector housing, whose control chamber is acted on by a control volume, and with control valves for increasing/relieving the pressure in the nozzle chamber of the injector and in the control chamber of the injector. The control valves are disposed in parallel to one another. They are hydraulically coupled to one another without side effects by means of a coupling chamber, and are actuated by means of an actuator that can be switched into different stroke levels.

Abstract: A fuel injector includes a homogenous charge nozzle outlet set and a conventional nozzle outlet set controlled respectively by inner and outer needle value members. The homogenous charged nozzle outlet set is defined by an outer needle value member that is moveably positioned in an injector body, which defines the conventional nozzle outlet set. The inner needle valve member is positioned in the outer needle valve member. The outer needle valve member is a piece component that includes at least one external guide surface, an external value surface and an internal valve seat.

Abstract: Using a swirl type fuel injection valve, a concentrated spray area and a thin spray area are formed, the position thereof are adjusted, and the spray is made to conform to the geometric shape of the engine and mounting position of the fuel injection valve, so as to reduce the fuel consumption and control the unburnt components in exhaust gas. The fuel injection valve is so constructed that a step is formed on the injection hole opening of the fuel injection valve, so as to provide two or more edge transition portions at the injection hole opening, resulting from the step, and the line connecting the edge transition portions forms an oblique angle relative to the wall formed by the step perpendicular to the injection hole center axis and the angled wall.

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 a plurality of spray-discharge orifices which is formed in the valve-seat member. At a discharge-side end of the fuel injector, a nozzle-orifice cover is positioned, which shields the spray-discharge orifices from the combustion chamber of the internal combustion engine.

Abstract: A fuel injector assembly comprising an engine camshaft driven piston plunger in a plunger body, a control valve, an electromagnetic actuator for stroking the control valve between limiting positions and a valve stop assembly establishing a first limiting valve stroke position when the control valve is fully open and a second valve stroke position corresponding to a reduced fuel delivery pressure prior to a main fuel pressure pulse in a fuel injection event.

Abstract: The invention is based on a hydraulic control device (60), in particular for an injector (16) of a fuel injection system (10) in motor vehicles. Known control devices have a piezoelectric actuator, which controls a multi-position valve (75), embodied as an outward-opening valve with a valve member (74) guided in a valve bore (76). According to the invention, it is proposed that a booster (62) that reverses the deflection motion of the actuator (52) be disposed between the actuator (52) and the valve member (74), and that the multi-position valve (75) be embodied as an inward-opening 3/2-way valve. The valve member (74) of this valve, in operative connection with a valve seat (98) and a control edge (96), alternatingly opens or closes pressure fluid connections between pressure fluid conduits (86, 88, 92).

Abstract: The fuel injection device has a fuel injection valve that has an injection valve member, which is guided so that it can slide in a valve body and controls at least one injection opening and which can be moved in the opening direction, counter to the force of a closing spring contained in a spring chamber by means of the pressure prevailing in a pressure chamber of the fuel injection valve. Highly pressurized fuel is supplied from a high pressure source to the pressure chamber of the fuel injection valve. An electrically controlled valve at least indirectly controls a connection of the pressure chamber to a relief chamber and connects the pressure chamber to the relief chamber in order to terminate the fuel injection. The pressure chamber of the fuel injection valve has a connection to the spring chamber, which connection contains a check valve that opens toward the pressure chamber.

Abstract: A fuel injection valve, in particular an injection valve for fuel injection systems of internal combustion engines, is made of a piezoelectric or magnetostrictive actuator and a valve closing body that can be set in motion by the actuator via a valve needle and that interacts with a valve seat surface to produce a seat. To compensate for the temperature expansion, at least one damping element made of a solid is present and exhibits an almost static behavior at a high deformation rate and is elastically or plastically deformable at a low deformation rate.

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

Abstract: An injection valve for injecting fuel into the combustion chamber of an internal combustion engine has an injector needle guided inside the housing in such a way that it can be displaced longitudinally with a shaft in order to open and close the injection cross-sections. The injector needle is actuated by the fuel pressure which act upon the injector needle and by a closing spring acting in the closing direction of the injection needle. The closing spring is pre-compressed between abutments on the injector needle and the housing and is situated on the perimeter of the injector needle in the area between the injector needle guide and the valve seat. One advantage of the arrangement is the compact construction of the injection valve and the low dead volume of the control chamber on the reverse side of the injector needle.

Abstract: The present invention provides a simple fluid atomizer having a pair of spring loaded sealing elements such that the pressure required to open both seals is the sum of the spring constants of each of the sealing elements. A central cavity is sealed at both its entry and exit by moving elements held by coil springs. When the fluid in the entry channel is able to overcome a first spring, the first sealing element is moved so as to allow fluid to enter the central cavity. When the fluid pressure within the central cavity reaches a level necessary to compress the exit spring, the entry fluid pressure must be at a level for achieving the delta pressure across both entry and exit springs.

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: The fuel injector comprises a control module, with a piston guide extending downwards, in which a control piston is arranged. The fuel injector further comprises a nozzle body, with a top surface on which the control module is mounted. The nozzle body comprises a drilling with a nozzle needle, co-operating with the control piston, arranged in the lower section thereof and the piston guide, arranged in the upper section thereof. A high pressure inlet is arranged in the control module and opens out into the drilling at the top surface. The drilling is embodied such that, on lifting the nozzle needle from the valve seat thereof, the fuel which escapes from the fuel injector is replaced, whereby fuel from the high pressure inlet flows through the drilling in the direction of the valve seat.

Abstract: A fuel injector (1) for the direct injection of fuel into the combustion chamber of an internal combustion engine encompasses an actuator (5), which is encapsulated in a first sleeve (4) and sealed from an inner chamber (25) of the fuel injector (1); a valve needle (19) actuable by the actuator (5), which includes a valve-closure member (23) cooperating with a valve-seat surface (24) to form a sealing seat; and a locking spring (22), by which the valve needle (19) is acted upon in such a manner that the valve-closure member (23) is held in sealing contact at the valve-seat surface (24). An inflow-side end face (29) of the first sleeve (4) is dimensioned such that a linear deformation of the first sleeve (4), caused by the fuel pressure present at the inflow-side end face (29), is compensated by a linear deformation of the actuator (5) and an activating piston (8) extending the actuator (5).

Abstract: A fuel injection nozzle is provided for a diesel engine. The fuel injection nozzle includes a nozzle body having a tip end portion, a top end portion having an opening edge, and a fuel inlet passage, a needle valve inserted in the nozzle body, and a bag-shaped rotary valve fitted with the tip end portion of the needle valve. The nozzle body has a first protrusion protruding from an inner peripheral surface toward a center axis of the nozzle body. The needle valve has a first guide groove being engaged with the first protrusion and a second guide groove. The rotary valve has a second protrusion protruding toward the center axis and being engaged with the second guide groove. This fuel injection nozzle may realize good combustion performance and good exhaust emission performance. Also the fuel injection nozzle may have a simple structure without increasing the size of the injector assembly.

Abstract: A helical compression spring for use in a component of a fuel injection system, for example a component in the form of a fuel injection valve, which helical compression spring has a spring wire cross section that corresponds to a rectangle in which the corners are rounded and the inner surface, which constitutes the inside of the helical compression spring, is curved in a sharply convex fashion. This cross sectional contour of the spring wire reduces the shearing stresses when the helical compression spring is loaded, as a result of which the helical compression spring can be embodied as shorter while retaining the same spring constant. The side surfaces of the spring wire, which are oriented toward each other in the helical compression spring, are embodied as at least approximately parallel to each other so that they rest against one another in a flat fashion at the ends of the helical compression spring due to the winding height that is reduced there.

Abstract: A fuel injector, e.g., an injector for fuel injection devices in internal combustion engines, has a valve needle with a valve-closure member which cooperates with a valve seat surface in a valve seat body to form a sealing seat, in which the valve seat body has a plurality of injection orifices that are isolated from the fuel supply by sealing seat. The valve-closure member has a pressure element in a recess facing the valve seat body, which is pre-tensioned against the valve seat body by a spring which is supported on the valve-closure member and presses a disc spring against the valve seat body, in such manner that the disc spring covers at least one of the injection orifices, and the spring element uncovers this injection orifice when the tension exerted by the pressure element is removed.

Abstract: In a fuel injection nozzle having a nozzle body which body has one first and one second group of injection ports, one first and one second nozzle needle, and one separate pressure chamber for each nozzle needle, so that the injection needles are adjustable independently of one another between a closed position, in which the injection ports associated with the corresponding nozzle needle are closed, and an injection position, in which the corresponding injection ports are opened, a free choice of injection cross sections is to be made possible, while the design is simple. To that end, it is provided that the two nozzle needles adjoin one another.

Abstract: A fuel injector preferably has a body, a closure member, a piezoelectric device, and a hydraulic thermal compensator. The body extends along an axis. The closure member is displaceable with respect to the body between a first configuration and a second configuration. The first configuration prevents fuel flow through the body, and the second configuration permits fuel flow through the body. The piezoelectric device displaces the closure member from the first configuration to the second configuration. The compensator is coupled with the piezoelectric device and includes a first tube, a second tube, a piston, and fluid. The first tube extends along the axis from a first end portion that occludes the first tube. The first end portion contiguously engages a first one of the body, the closure member, and the piezoelectric device. The second tube is telescopically received in the first tube.

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 fuel injection systems of internal combustion engines includes a valve needle and a valve-closure member mechanically linked to it, which cooperates with a valve-seat surface situated in a valve-seat member to form a sealing seat, and at least one swirl-producing element which is situated upstream from the sealing seat in the valve-seat member. One or more swirl channels which are open toward the upstream side of the valve-seat member are incorporated into the upstream side of the valve-seat member as a swirl-producing element.

Abstract: A fuel injector, particularly an injection valve for fuel-injection systems of internal combustion engines, has a first piezoelectric or magnetostrictive actuator and a valve-closure member that can be actuated by the first actuator via a valve needle. The valve closure member interacts with a valve seat surface to form a sealing seat. A second piezoelectric or magnetostrictive actuator acts on the valve needle in opposition to the first actuator. In this context, the actuators are interconnected by a supporting element which is permanently mounted in the fuel injector.

Abstract: A fuel injection valve for internal combustion engines, having a valve body that tapers toward the combustion chamber, forming an annular heel, and merges with a valve shaft protruding as far as the inside of the combustion chamber. The fuel injection valve is disposed in a receiving bore, and the diameter of the receiving bore decreases toward the combustion chamber, forming a stop face. In the installed position, the annular heel is pressed against the stop face with the interposition of a sealing disk, and on the side toward the valve retaining body, the sealing disk has an annular rib encompassing it or interrupted at at least one point, and this annular rib surrounds the annular heel and engages an undercut, formed on the outside jacket face of the annular heel, and is thereby joined in captive fashion to the valve body.

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

Abstract: In a dynamic flow rate adjusting method, a press-fitting degree of an adjusting pipe is adjusted to regulate a load applied to a needle by a spring in a direction for closing an injection hole. Thus, a dynamic injection quantity of an injector is adjusted. An injection command signal having one-minute long pulse width is applied to the injector to measure a static flow rate, from which the press-fitting degree is calculated. Thus, the press-fitting degree, in which variation in the static flow rate is taken into consideration, can be calculated. Therefore, variation in the dynamic flow rate of each injector, which is calculated from the press-fitting degree, includes only a dynamic flow rate error, while a static flow rate error is eliminated from the variation in the dynamic flow rate.

Abstract: A fuel injector is provided which is designed to suppress unwanted vibrations of a nozzle needle-actuating piston, thereby avoiding the injection of an excess quantity of fuel. The fuel injector comprises an actuator and a displacement amplifying chamber filled with fluid to which a large-diameter piston and a small-diameter piston working as the nozzle needle-actuating piston are exposed. The displacement amplifying chamber works to amplify and transmit displacement of the large-diameter piston by the actuator to the small-diameter piston. The fuel injector also includes a stopper which restricts movement of the small-diameter piston toward the displacement amplifying chamber to a given range, thereby suppressing the unwanted vibrations of the small-diameter piston.

Abstract: The invention relates to an injection valve (1) for injecting fuel into the combustion chamber of an internal combustion engine. The injector needle (17) of the injection valve (1) is guided inside the housing in such a way that it can be displaced longitudinally with a shaft (19) in order to open and close the injection cross-sections. The injector needle (17) is actuated by the fuel pressure which acts upon the injector needle and by a closing spring (16) acting in the closing direction of the injector needle. The closing spring (16) is pre-compressed between abutments on the injector needle (17) and the housing and is situated on the perimeter of the injector needle in the area between the injector needle guide (26) and the valve seat (18). One advantage of said arrangement is the compact construction of the injection valve (1) and the low dead volume of the control chamber (11) on the reverse side of the injector needle.

Abstract: A fuel supply system has a pump, a common rail, and injectors. Pressurized fuel is stored in the common rail. The common rail distributes the fuel to the injectors. A liquid fuel and a liquefied gas fuel such as dimethyl ether and a liquefied petroleum gas may be used as a fuel. In each injector, a valve element is actuated directly by an electromagnetic actuator. The injector has a low pressure chamber for decreasing a biasing force which acts on the valve element in a valve closing direction. The valve element can be divided for replacement. The injector has means for suppressing the bounce of the valve element. A hydraulic unit which utilizes the fuel suppresses the bounce of the valve element. The fuel supply system is connected to a refrigerating cycle. The fuel leaking from the fuel supply system is cooled and again liquefied by the refrigerating cycle.

Abstract: The present invention relates to a valve for controlling fluids, which includes a valve member (4) that is actuatable via a piezoelectric actuator (2) and a hydraulic booster (3). The valve further includes a holder (6), a valve piece (7), a shim (8), and a nozzle body (9). The valve piece (7), the shim (8), and the nozzle body (9) are joined together via at least two screws (13), and the screws (13) are disposed radially to a center axis (M-M) of the valve. This makes both a simple design of the valve and economical assembly possible.

Abstract: A fuel injection valve, especially an injection valve for fuel injection systems of internal combustion engines, includes a piezoelectric or magnetostrictive actuator and a valve-closure member, which can be actuated by an actuator via a valve needle and interacts with a valve-seat surface to form a sealing seat. An intermediate piece is connected via a first flexible seal to a support plate; the support plate is connected via a second flexible seal to a driver at the valve needle; and the driver is connected via a third flexible seal to the intermediate piece, thereby creating a sealed hydraulic translation device.

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

Abstract: A fuel injection valve for internal combustion engines, having a pistonlike valve member, axially movable counter to the closing force of a spring, in the bore of a valve body and that controls at least one injection opening. A control chamber surrounding the valve member is disposed between a guided portion of the valve member and an oil leakage chamber that receives the spring; the valve member communicates with an inlet conduit via a throttling annular gap and with the oil leakage chamber via a control bore. In the closing motion of the valve member away from the valve seat, fuel is positively displaced out of the control chamber into the oil leakage chamber by a pressure face. In a portion of the valve member stroke, the control chamber is closed, except for a throttle gap formed between a cylindrical portion and the control bore, toward the oil leakage chamber, and the fuel pressure in the control chamber rises, since the outflow can now take place only via the throttle gap.

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: A variable pressure fuel injection system and multi-flow rate injector is provided which produces multiple fuel injection flow rates from a common source of pressurized fuel to enable reductions in emissions, combustion noise and particulates while improving fuel consumption. The present invention includes inner and outer needle valve elements biased into respective closed positions against respective valve seats for controlling the flow through corresponding sets of injection orifices. The movement of each valve is controlled by an injection control valve controlling the drain flow of control fuel from respective control volumes positioned at outer ends of the valve elements. Valve element bias spring preloads along with control flow orifices and needle valve element surface areas are selected to cause, for example, single valve operation at low fuel supply pressure and dual valve operation at high supply pressure.

Abstract: The invention relates to a common rail fuel injector having an injector housing with a fuel inlet in communication with a central high-pressure fuel reservoir outside the injector housing and with a pressure chamber inside the injector housing. A control valve assures that a nozzle needle lifts from a seat when the pressure in the pressure chamber is greater than the pressure in a control chamber that communicates with the fuel inlet via an inlet throttle. The control chamber is defined by a bush that is displaceable, causing a sealing action, on the end of the nozzle needle remote from the combustion chamber and that is kept in contact against the injector housing with the aid of the nozzle spring.

Abstract: In an injection nozzle for a fuel injection system, the opening stroke of the nozzle needle is to be limited selectively, so that different injection cross sections can be employed. To that end, the injection nozzle is provided with a nozzle body, a nozzle needle displaceable in the nozzle body, two groups of injection ports, which are uncovered as a function of an opening stroke of the nozzle needle, a piston that is connected to the nozzle needle, a stop chamber in which the piston is disposed and which is provided with an outlet, and a control valve that can open and close the outlet of the stop chamber, as a result of which the stroke of the piston in the stop chamber and thus the opening stroke of the nozzle needle can be selectively limited.

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

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

Abstract: Reduced thickness portions in a form of a recess are formed in a contact surface in a lower end of a tip packing, which contacts with an upper end of a nozzle body. Furthermore, reduced thickness portions in a form of a recess are formed in a contact surface in an upper end of the tip packing, which contacts with a nozzle holder. With this arrangement, a sealing surface pressure around a connection between corresponding fuel passages is increased with use of a reduced axial fastening force by reducing the sealing surface area in each contact surface. Furthermore, one of the reduced thickness portions formed in the contact surface in the upper end of the tip packing is used as a leakage recovery passage.

Abstract: The nozzle has a conical wall with injection orifices; the pin has a tip activated by an axial force to engage the wall and close the orifices; the tip has a truncated-cone-shaped portion having an outer surface which rests entirely on the wall, possibly as a result of elastic deformation of the outer surface; and the outer surface forms with the wall a substantially zero angle with a tolerance of 0′ to ±10′.

Abstract: A fuel injector seal for preventing the intrusion of liquid fuel into the working moving parts of a fuel injector. The seal is in the form of a flexible bellows, assembled from first, inner and second, outer caps joined together. The seal is positioned in the injector to create a liquid tight seal between the reciprocating injector jet needle and the enclosure for the remaining fuel-sensitive components of the injector.

Abstract: A reverse flow valve member is positioned within an injector body of a fuel injector and is movable between a closed position and an open position. When the reverse flow valve member is in its closed position, an upper portion of a nozzle supply passage is blocked from fluid communication with a lower portion of the nozzle supply passage. A compressed spring biases the reverse flow valve member to its closed position. When the reverse flow valve member is in its open position, the fuel pressurization chamber is fluidly connected to the lower portion of the nozzle supply passage. The present invention limits gas ingestion due to tip leakage, and allows an injector with trapped gas to prime itself.

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 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 has a metering valve arranged to open under a predetermined feed pressure which constitutes a first threshold pressure, and to remain open in response to said feed pressure increasing so as to deliver fuel to fuel utilization means. The flow rate of fuel passing through the injector is metered to feed said utilization means so long as the feed pressure remains below a second threshold pressure greater than the first threshold pressure. Above the second threshold pressure, the metering valve behaves like a fixed diaphragm as a function of the fluid flow sections formed therethrough. Individual adjustment means are provided so as to enable said second threshold pressure to be adjusted for each injector to ensure that fuel is injected at a uniform flow rate by all of the injectors in a combustion chamber.

Abstract: A closed needle injector assembly is provided which effectively permits low fueling quantity control in short duration injections and pilot quantity control in longer duration events without compromising energy efficiency, maximum fuel delivery rates nor requiring increased operating pressures. The closed needle injector assembly includes first and second needle valve elements and a throttle passage formed in the second needle valve element to restrict fuel flow through an injector orifice. The second needle valve element is telescopingly received within the first needle valve element. Respective control volumes and one or more injection control valves are used to control the movement of the needle valve elements. Operation of the assembly results in movement of the first needle valve element to an open position for throttling fuel flow through the throttle passage followed by subsequent lifting of the second needle valve element for longer duration injections.