Abstract: The invention relates to an injector for injecting fuel into combustion chambers. According to the invention, a valve piston of a control valve is provided with low pressure on both faces thereof. The valve piston is arranged in a valve chamber hydraulically connected to a control chamber and is guided inside a sleeve received in the valve chamber. The valve chamber contains a spring supported on one end against the sleeve and on the other end on the valve piston such that the spring presses the valve piston onto a valve seat and the sleeve onto an opposing bottom surface. The valve piston diameter inside the sleeve corresponds to the effective valve piston diameter at the valve seat.

Abstract: A fuel injector (1), in particular a pump-nozzle injector for a diesel engine has an injector body (50), which is held in place with a nozzle body (40) and/or a lower body (60) by a clamping nut (10, 30). The fuel supply conduit of the injector body (50) is provided with a fuel filter (20), which is offset in the longitudinal direction of the fuel injector (1) in relation to the clamping nut (10, 30) and is configured independently of said clamping nut (10, 30) on the fuel injector (1).

Abstract: A fuel injection valve for an internal combustion engine is such that an inside wall of a nozzle hole through which fuel is injected into a combustion chamber or an intake port of the internal combustion engine is coated with a composite coating formed of a lipophilic portion and an oil repelling portion which are finely interspersed on the nano order. The inside wall of the nozzle hole is formed by multiple grooves extending in the fuel jet direction and flat portions between these grooves, and inside walls of the grooves are coated with an oil repellant coating and the flat portions are coated with a lipophilic coating.

Abstract: An outer needle valve (42) and an inner needle valve (43) face on back sides thereof an outer control chamber (R2) and an inner control chamber (R3), which are independent of each other, respectively. An outer fuel outflow passage (C4) and an inner fuel outflow passage (C5) for causing fuel to flow out from the outer control chamber (R2) and the inner control chamber (R3) respectively meet at a meeting portion (Y). A control valve (45) for rendering in communication/shutting off a fuel discharge passage (C6) for connecting the meeting portion (Y) to a fuel tank (T) is interposed in the fuel discharge passage (C6). An automatic valve (44) as an open/close valve for shutting off the outer fuel outflow passage (C4) when a rail pressure (Pcr) is equal to or lower than a predetermined value and rendering in communication the outer fuel outflow passage (C4) when the rail pressure (Pcr) is higher than the predetermined value is interposed in the outer fuel outflow passage (C4).

Abstract: A fuel transfer system having a nozzle with an inlet in communication with a source of pressurized fuel in a portion of a fuel tank, and an outlet through which the fuel is discharged. A restrictor is arranged between the source of pressurized fuel and the nozzle. A first venturi receives fuel dispensed from the nozzle, and a second venturi receives fuel dispensed from the first venturi. The second venturi has an outlet in fluid communication with the portion of the fuel tank housing the source of pressurized fluid.

Abstract: A nozzle module for an injection valve has a nozzle body with a recess with a wall, being operable to hydraulically couple the recess to a high pressure fluid circuit, a seal seat embodied on the wall, at least one nozzle needle arranged in an axially moveable fashion in the recess. The needle has a seat area with a sealing surface interacting with the seal seat to open and close the valve, respectively, and a supporting area, arranged radially outside and axially at a distance from the seat area and supporting the needle against the wall when the needle closes. The needle has at least one needle recess, which when the supporting area rests against the wall of the body recess, an area of the body recess facing axially away from the seat area is hydraulically coupled to an area of the body recess which axially faces the seat area.

Abstract: A fuel injection valve is provided that includes a valve seat member (3) having a conical valve seat (8) and a valve hole (7) formed through a central part of the valve seat (8), a valve body (18) working in cooperation with the valve seat (8), and an injector plate (10) joined to the valve seat member (3) and having a plurality of fuel injection holes (11) radially outwardly displaced from the valve hole (7), a diffusion chamber (39) providing communication between the valve hole (7) and the fuel injection holes (11) being provided between the valve seat member (3) and the injector plate (10), wherein the diffusion chamber (39) formed between the valve seat member (3) and the injector plate (10) is in an annular shape, has a diameter that is larger than that of the valve hole (7), and has inner ends of the fuel injection holes (11) opening therein, and a plurality of fuel passages (42a, 42b) are disposed within the valve hole (7), the plurality of fuel passages (42a, 42b) reversing within the valve hole (7)

Abstract: A fuel injection device has a nozzle body formed with an injection hole for injecting fuel and a nozzle needle reciprocating in the nozzle body to open and to close the injection hole. The nozzle needle has a sliding portion capable of moving in the nozzle body in a sliding manner, an insertion portion, of which diameter is smaller than that of the sliding portion, and a pressure receiving portion connecting the sliding portion with the insertion portion. The nozzle body has a guide portion for slidably holding the sliding portion and a fuel sump chamber formed on the injection hole side of the guide portion. The insertion portion is inserted through the fuel sump chamber. A clearance decreasing toward the fuel sump chamber is provided between the guide portion and the sliding portion.

Abstract: An apparatus, system, and method are disclosed for optimizing a valve orifice shape. According to one representative embodiment, a method includes determining a specified relationship between a valve position and an output characteristic, and determining an orifice profile. The method also includes determining a relationship of an orifice area to the output characteristic. Further, the method includes shaping an orifice in a valve based on the orifice profile and the specified relationship between the valve position and the output characteristic. According to the method, the valve should approximately exhibit the specified relationship.

Abstract: A common-rail fuel injector (1) has a forged housing containing a nozzle and a reservoir (2) for supplying the nozzle with fuel. In order to reduce its height the housing integrally incorporates a flow limiter (4) and a filter (5) in a laterally protruding portion (1a) to which the fuel pipe is connected at (18). This means that the reservoir can be held in place underneath the engine cover (30) by a clamp (3) between the rocker levers (16) in a space-saving manner, and the injector can be removed without disturbing the valves.

Abstract: A method and apparatus for injecting fluid into a machine are disclosed. A fluid injector is disclosed having a nozzle body with first and second body portions and at least one fluid injection orifice within the second body portion. The nozzle body may be configured for transmitting fluid from the first body portion toward the orifice. The fluid injector may also include a check member movably arranged inside the nozzle body for affecting fluid flow through the orifice and having a contoured outer surface defining (i) a recessed region and (ii) a generally convex region forming at least a portion of the recessed region.

Abstract: The invention relates to an injector for injecting fuel into a combustion chamber of an internal combustion engine. The injector is actuated by an actuator and is connected to a fuel supply line via which fuel is supplied under system pressure. At least one injection opening can be opened or closed off by an injection valve member, which is activated by a control piston via a control chamber to which the control piston and a piston section of the injection valve member are exposed with respective pressure faces. The control piston is a valve piston of a control valve. The pressure face of the control piston and the pressure face of the piston section of the injection valve member are exposed to the control chamber at the same side. The control piston and the piston section of the injection valve member also enclose a further control chamber which is connected to a fuel return line when the control valve is open and to the fuel supply line when the control valve is closed.

Abstract: This injector with two valves (7, 10) which open at different fuel pressures so as to establish a primary flow regime and then a secondary flow regime is characterized in that the primary regime is enriched with fuel via an orifice (21) which adds a branch to the primary flow path of the fuel, but which is closed when the secondary valve is displaced so as to prevent enrichment of the fuel in the secondary regime. This invention applies in particular to certain aircraft engines.

Abstract: A fuel injector has a housing extending along a longitudinal axis between an inlet and an outlet. The housing has an elongated member connected to a body by a thin shell connector member with a stepped portion. The connector member has a generally constant thickness with a first internal volume and a second internal volume where the second internal volume is at least 1.1 times the first internal volume.

Abstract: A piezoelectric actuator and an injector for an internal combustion engine are proposed, the electromagnetic compatibility of which is significantly improved in comparison with conventional injectors. The actuator head and/or actuator foot is manufactured out of a ceramic material, thus reducing the capacitance of the electric capacitor that is formed between the electrical ground and the piezoelectric actuator. An advantage of the piezoelectric actuator according to the invention is that no additional components are required. The change from metallic materials to ceramic materials also increases the rigidity of the piezoelectric actuator since ceramic materials have a significantly higher modulus of elasticity than metals.

Abstract: A fuel injection system is disclosed. The fuel injection system has a nozzle member configured to receive fuel and having at least one injection orifice and a valve disposed with the nozzle member and movable between an open position at which fuel flows through the at least one orifice and a closed position at which fuel flow through the at least one orifice is blocked. The fuel injection system also has an actuator coupled to the valve and configured to move the valve between the open position and the closed position in response to a signal applied thereto and a controller in communication with the actuator, the controller being configured to apply to the actuator an ultrasonic frequency signal such that the valve remains at or between the open position or the closed position and vibrates at the ultrasonic frequency.

Abstract: An injection nozzle (4) for an internal combustion engine, the injection nozzle (4) including a nozzle body (6) provided with a bore (8) defining a valve seating surface, and having a first nozzle outlet and a second nozzle outlet, a first delivery chamber upstream of said nozzle outlets, an outer valve member, moveable within the bore (8) and itself provided with an axial bore (8), wherein the outer valve member is engageable with an outer valve seat defined by the valve seating surface so as to control fuel flow from a first delivery chamber to at least the first nozzle outlet when the outer valve member lifts from its seat.

Abstract: A control system for a fuel injector is disclosed. The control system has a nozzle member with at least one orifice, and a needle check valve. The needle check valve is recipratingly disposed to open and close the at least one orifice. The control system also has a control chamber located at the base end of the needle check valve, and a control valve movable to selectively drain and fill the control chamber. The control system further has an injector body, a first piston located within the injector body, and a second piston located within the injector body. The first piston is operatively connected to the control valve to move the control valve. The second piston is located a distance from the first piston to form a coupling chamber. The control system additionally has a partial-ball check valve associated with the coupling chamber to selectively replenish the coupling chamber.

Abstract: A fuel injector and servovalve for an internal combustion engine.

Abstract: A metering servovalve for a fuel injector of an internal combustion engine has an electro-actuator and a fixed valve body, which defines a control chamber communicating with an inlet and with an outlet channel. The outlet channel has at least one calibrated restriction and exits through the lateral surface of an axial stem, on which a sleeve slides, in a substantially fluid-tight manner, to open/close the outlet channel and so vary the pressure in the control chamber. The outlet channel is closed by an end portion of the sleeve that is elastically deformable in a radially outward direction, under the thrust of the fuel pressure, to increase the diameter at which the seal against the valve body is formed, with respect to a non-deformed state, and to generate a radial unbalancing force on the sleeve upon opening when the outlet channel is closed.

Abstract: A method of controlling wear in a fuel injector assembly is provided. The method can include selecting an injector assembly including a fuel injector plunger including a plunger substrate material and a first coating on the plunger substrate material, and a fuel injector bore including a bore substrate material and a second coating on the bore substrate material. The first and second coatings of the plunger and bore are in sliding engagement and can include chromium nitride. Fuel may be supplied to the bore assembly using a fuel that includes at least one of an ultra-low sulfur fuel and a low lubricity fuel.

Abstract: A fuel injector injects high-pressure gaseous fuel directly into a cylinder of an engine. A small amount of liquid fuel is used in the injector to lubricate sliding portions of the fuel injector in addition to utilizing it as a medium for transmitting driving force. The fuel injector includes a nozzle member having injection holes at its elongated end and a needle slidably disposed in an elongated center hole of the nozzle member. The needle is driven by pressure of the liquid fuel introduced into a control chamber to open or close the injection holes. The pressure in the control chamber is controlled by a switching valve which is in turn driven by an actuator such as an electromagnetic or piezoelectric actuator. The liquid fuel is injected together with the high-pressure gaseous fuel after lubricating the sliding portions between the nozzle member and the needle.

Abstract: A direct injection fuel injector includes a nozzle tip having a plurality of passages allowing fluid communication between an inner nozzle tip surface portion and an outer nozzle tip surface portion and directly into a combustion chamber of an internal combustion engine. A first group of the passages have inner surface apertures located substantially in a first common plane. A second group of the passages have inner surface apertures located substantially in at least a second common plane substantially parallel to the first common plane. The second group has more passages than the first group.

Abstract: An electrically operated injector (1) for feeding a gaseous fuel to a cylinder of an internal combustion engine, in particular for a motor vehicle, includes an electromagnetic actuator (2) acting on a mechanical interceptor member (3) arranged to free or intercept a passage (4) for the fuel from a feed conduit (61) to a delivery conduit (5) connected to an outlet (6), between the delivery conduit (5) and the interceptor member (3) there being positioned a seal element (40). This latter is carried by the interceptor member (3) and has a shape tapering towards the delivery conduit (5) in order to effectively intercept the fuel gas passage (4) and minimize the area of impact with an annular end portion (43) of the delivery conduit (5).

Abstract: A fuel injector for an internal combustion engine is proposed having a directly actuatable injection valve element. The fuel injector has a nozzle needle, axially guided in a nozzle body, and an actuator accommodated in an injector housing. The nozzle needle is connected to a coupling piston on the nozzle-needle side and the actuator is connected to a coupling piston on the actuator side. The coupling piston on the actuator side acts on a coupling chamber and the coupling piston on the nozzle-needle side acts on a control chamber. The nozzle needle is lifted from a nozzle-needle sealing seat as a function of the pressure in the control space. An intermediate plate is provided between injector housing and nozzle body. The plate has a conduit hydraulically connecting the coupling chamber to the control chamber. The conduit contains a hydraulic throttle which has at least two sections having different cross sections of flow.

Abstract: A fuel injector has an injector body extending along a given axis; a tubular valve body housed inside a hole in the injector body and coaxial with the injector body; and an annular chamber defined by the injector body and the valve body. The method of producing the injector includes connecting the valve body to the injector body, and fixing the valve body in a given position along the axis with respect to the injector body by means of a driving operation to interference fit the valve body inside the hole in the injector body.

Abstract: This invention relates to the injection of compressible gaseous fuel directly into the combustion chamber of a reciprocating piston-type internal combustion engine. In particular, the invention provides apparatus and methods for low-pressure, high-speed direct injection of compressed natural gas into a combustion chamber of an engine. Using the present invention, relatively low intake pressures of about 50 to about 150 PSIG yield high-speed (sonic and supersonic) gas flow through the diverging nozzle portion for injection into the combustion chamber. Preferably, the gas reaches supersonic velocity, approaching Mach 1.5 to 2.5.

Abstract: Multiple intensifier injectors with positive needle control and methods of injection that reduce injector energy consumption. The intensifiers are disposed about the axis of the injectors, leaving the center free for direct needle control down the center of the injector. Also disclosed is a boost system, increasing the needle closing velocity but without adding mass to the needle when finally closing. Direct needle control allows maintaining injection pressure on the fuel between injection events if the control system determines that enough fuel has been pressurized for the next injection, thus saving substantial energy when operating an engine at less than maximum power, by not venting and re-pressurizing on every injection event.

Abstract: A fuel injector comprising a nozzle having a nozzle needle which is moveable with respect to a first needle seat to control fuel delivery through a nozzle outlet. The injector includes a nozzle control valve for controlling fuel flow into a control chamber through a first passage to pressurise the control chamber, and for controlling fuel flow out of said control chamber through said first passage to depressurise the control chamber. Movement of the nozzle needle is controlled by fuel pressure within the control chamber, such that pressurising the control chamber causes the nozzle needle to be urged against the first needle seat to close the nozzle outlet, and depressurising the control chamber causes the nozzle needle to lift from the first needle seat to open the nozzle outlet. The nozzle needle defines, at least in part, a restricted passage through which fuel can flow into the control chamber as the control chamber depressurises.

Abstract: The injector comprises a balanced metering servovalve to control a rod for the opening/closing of a nozzle. La servovalve has a valve body with a control chamber radially delimited by a tubular portion and fitted with an outlet passage that is opened/closed by an axially movable shutter. The servovalve is also integral with an axial stem, provided with a lateral surface, through which the outlet channel exits. The shutter is coupled to the stem in an axially sliding manner and, when it closes the outlet passage, it is subjected to substantially null axial fuel pressure. The outlet passage has a calibrated segment distanced from the shutter and close to a bottom wall of the control chamber. The calibrated segment is carried by an element fixed to the valve body in correspondence to an axial segment of the outlet passage.

Abstract: A fuel injector having a piezoelectric actuator in an injector body and held in contact with the injector body on one side and with a sleevelike booster piston on the other via first spring means. A nozzle body joined to the injector body and a stepped nozzle needle is guided in the body. A second spring disposed inside the booster piston which together with the injection pressure acting on the back side of the nozzle needle keeps the nozzle needle in the closing position. A control chamber on the end toward the nozzle needle of the booster piston communicates, via at least one leakage gap with a fuel supply at injection pressure, and the nozzle needle is urged in the opening direction by the fuel located in the control chamber.

Abstract: Arrangement of joint packing between the pump-injector (injector) body (1) and nozzle body (2) for internal combustion engines, primarily diesels, wherein in order to increase the specific pressures between the faces of joined precision surfaces of pump-injector (injector) body (1) and nozzle body (2) (and also when there is an insert (3) installed between said faces) pressed together by a nut (9), said surfaces have a reduced contact area achieved by bounding these surfaces by a contour line (17) surrounding the channels reaching out to said joints. This allows for reliable sealing (joint packing) between pump-injector (injector) body (1), nozzle body (2), and the face of the insert (3) at high injection pressures (2500 Bar and higher).

Abstract: The invention relates to a fuel injection device for an internal combustion engine having a housing, a first valve element, which has a first hydraulic control surface acting in the closing direction at least one second valve element, which has a second hydraulic control surface acting in the closing direction. Each valve element is associated with its own hydraulic control chamber, which can be connected to a shared high-pressure connection and is at least partially delimited by a respective hydraulic control surface. There is a fluid connection between the control chambers. The fuel injection device includes a valve device that can disconnect the fluid connection.

Abstract: An injection nozzle for an internal combustion engine, the injection nozzle including an outer valve needle which is engageable with an outer valve seating so as to control injection through a first nozzle outlet, an inner valve needle which is movable within the outer valve needle and engageable with an inner valve seating so as to control injection through a second nozzle outlet, and a coupling arrangement for coupling movement of the outer valve needle to the inner valve needle in circumstances in which the outer valve needle is moved away from the outer valve seating beyond a predetermined amount, thereby to permit fuel injection through both the first and second nozzle outlets.

Abstract: A fuel injector having a stroke reversal with a two-stage pressure booster. If the piezoelectric actuator expands, then via a control piston, a pressure p2 is briefly elevated in a second control chamber and a booster piston is displaced counter to a closing direction, as a result of which the pressure p2 of the hydraulic fluid in the second control chamber rises again. The booster piston carries an injection valve member along with it produces a first opening motion of the injection valve member. By the motion of the control piston in the closing direction, a pressure p1 in a first control chamber is briefly reduced. The first control chamber is in communication, via a pressure equalization conduit, with a differential pressure chamber of the injection valve member and the pressure p3 in the differential pressure chamber also drops, producing a further, hydraulic force further raising the injection valve member.

Abstract: The invention relates to a device for damping liquid pressure waves in conduits and containers that conduct and/or store liquids, in particular in conduits and containers of injection systems in motor vehicles. To convert vibrational energy into thermal energy, at least one reflection surface for reflecting at least some of the liquid pressure waves is provided in the container or in the conduit in a region that is separate from the remainder of the container or the conduit.

Abstract: A fuel injection device has a nozzle body formed with an injection hole for injecting fuel and a nozzle needle reciprocating in the nozzle body to open and to close the injection hole. The nozzle needle has a sliding portion capable of moving in the nozzle body in a sliding manner, an insertion portion, of which diameter is smaller than that of the sliding portion, and a pressure receiving portion connecting the sliding portion with the insertion portion. The nozzle body has a guide portion for slidably holding the sliding portion and a fuel sump chamber formed on the injection hole side of the guide portion. The insertion portion is inserted through the fuel sump chamber. A clearance decreasing toward the fuel sump chamber is provided between the guide portion and the sliding portion.

Abstract: A fuel injection device for an internal combustion engine includes a housing and at least one valve element which cooperates with a valve seat on an injection end of the housing. A plurality of fuel outlet conduits in the housing are associated with the valve element. In the region of the beginning of the fuel outlet conduits a flow chamber is present which is formed by at least one annular groove that is concentric with the longitudinal axis of the valve element.

Abstract: An improved injector which mixes a secondary fluid into a carrier fluid stream has (a) a body for directing the flow of the carrier fluid, this body having an internal wall forming a flow passage therethrough, a central axis, an inlet, an outlet, and a port for receiving the secondary fluid that is mixed with the carrier fluid, (b) a ramp-like restriction portion which is located downstream of the body's inlet and upstream of the secondary fluid port and configured so as to decrease the effective cross-sectional area of the flow passage in the direction of the flow of the carrier fluid, (c) a ramp-like expansion portion which is located downstream of the secondary fluid port and upstream of the body's outlet and configured so as to increase the effective cross-sectional area of the flow passage in the direction of the flow of the carrier fluid, (d) a throat portion which is situated between the restriction and expansion portions, and (e) a cavity in the throat that extends from its internal wall and into the

Abstract: A fuel injection valve for internal combustion engines, having a valve body with a bore defined on its end toward the combustion chamber by a conical valve seat, with a valve needle disposed longitudinally displaceably in the bore and a sealing face with two sealing portions on its end toward the combustion chamber with the second conical face being disposed on the combustion chamber side of the first conical face. An annular groove extending between the conical faces has an end facing away from the combustion chamber which acts as a sealing edge upon contact of the valve sealing face with the valve seat. Recesses embodied in the valve seat and/or on the valve sealing face hydraulically connect the annular groove with a portion of the second conical face located on the combustion chamber side of the annular groove.

Abstract: A fuel injection valve for internal combustion engines, having a valve body (1) in which a bore (3) is embodied that is defined on its end toward the combustion chamber by a valve seat (18) at which at least one injection opening (20) originates. The hollow valve needle (8) is located longitudinally displaceably in the bore (3) and has a valve sealing face (35) on its end oriented toward the valve seat (18). A first sealing region (31; 34) and a second sealing region (32; 46; 48) are embodied on the valve sealing face (35), and upon contact of the hollow valve needle (8) with the valve seat (18), the first sealing region (31; 34) upstream of the at least one injection opening (20) and the second sealing region (32; 46; 48) downstream of that injection opening effect sealing between the valve sealing face (35) and the valve seat (18) (FIG. 1).

Abstract: An injection nozzle for use in delivering fuel to a combustion space, the injection nozzle comprising a nozzle body, at least a part of which is provided with a first coating arranged so as to reduce the temperature of at least a part of the nozzle body, in use. The coating may have either a higher or lower thermal conductivity than the thermal conductivity of the nozzle body.

Abstract: The invention provides an injection nozzle for an internal combustion engine, the injection nozzle (2) including an outer valve member (8) received within a bore (6) provided in a nozzle body (4) and being engageable with a first seating region (20) to control fuel flow from a first delivery chamber (32) to a first nozzle outlet (22), an inner valve member (44) slidable within an outer valve bore (34) provided in the outer valve member (8) and being engageable with a second seating region (46) to control fuel flow from a second delivery chamber (62) to a second nozzle outlet (48), a lifting arrangement (80) associated with the outer valve member (8) such that movement of the outer valve member (8) is transmitted to the inner valve member (44) when the outer valve member (8) is moved through a distance greater than a predetermined distance (L), and a control chamber (7) arranged to receive pressurised fuel, in use.

Abstract: A fuel injection valve includes a fuel injection port, a needle for cutting the fuel flow into the fuel injection port and a needle mover for moving the needle away from the fuel injection port and allowing the fuel to flow into the fuel injection port. When the needle is moved away from the fuel injection port by the needle mover, the force is applied by a force applicator to the needle away from the fuel injection port only during the period when the needle is moved away from the fuel injection port to less than a predetermined degree.

Abstract: A fuel injection device includes at least two valve elements, disposed in a housing and coaxial with one another, with at least one fuel outlet opening associated with each valve element. On the outer valve element, radially outward from the at least one fuel outlet opening associated with it, there is a first sealing edge which cooperates with a valve seat on the housing and can separate the at least one fuel outlet opening from a high-pressure connection. An additional sealing edge is provided on the outer valve element, between the at least one fuel outlet opening associated with it and the inner valve element.

Abstract: Among other aspects shown and described, a fuel supply apparatus that provides multiple fuel spray targeting angles as a function of fuel pressure towards a combustion chamber of an engine to reduce hydrocarbon emission during cold-start or hot-start. A method and fuel system are also shown and described.

Abstract: A fuel injection valve includes a nozzle body and a plate. The nozzle body includes an injection orifice, through which fuel is injected, a needle that controls the injection through the injection orifice, and a needle-receiving bore that receives the needle. The plate is adjacently provided to the nozzle body for defining a fuel passage therein, through which fuel is supplied to the needle-receiving bore. The plate has an annular groove, which connects the fuel passage with the needle-receiving bore, at an end surface of the plate toward the nozzle body.

Abstract: The invention relates to a device for injecting fuel into a combustion chamber of an internal combustion engine, and which includes a fuel injector which can be acted upon by fuel at high pressure via a high-pressure source and is actuatable via a metering valve. Associated with the injection valve member is a damping element, which is movable independently of it and defines a damping chamber. The damping element has at least one overflow conduit for connecting the damping chamber to a further hydraulic chamber.

Abstract: A sealing element for a fuel injector insertable into a receiving bore of a cylinder head of an internal combustion engine for direct injection of fuel into a combustion chamber of the internal combustion engine includes a sealing element surrounding a nozzle body of the fuel injector peripherally. The sealing element includes a base body having an axial recess through which the nozzle body extends. The base body also has an annular recess which communicates with the recess and into which the sealing element is introduced. At a first contact face, the base body is in at least indirect contact with an end face of the fuel injector, and at a second contact face opposite the first contact face, the base body is at least in indirect contact with a step of the receiving bore.

Abstract: A fuel injector with a direct needle control for an internal combustion engine, having an actuator, a hydraulic booster, and a nozzle needle guided in a nozzle body and acting on a nozzle needle sealing seat. The hydraulic booster includes a booster piston connected to the actuator and a nozzle needle booster piston connected to the nozzle needle; a booster chamber in the form of an actuator coupler chamber is associated with a pressure surface of the actuator booster piston; and depending on the pressure in the actuator coupler chamber, the nozzle needle is lifted away from the nozzle needle sealing seat, thus initiating an injection. In addition to the actuator booster piston, a control element is provided that is able to execute a stroke motion, is hydraulically coupled to the actuator coupler chamber by means of a first control surface, and is associated with a control chamber by means of a second control surface.