Abstract: The fuel injection valve, for an internal combustion motor, has a valve body with injection openings (20) at its point. A valve needle has an axial movement within the valve body, with a conical needle point to give a selective blocking and release of the fuel flow through the injection openings. The point of the valve needle has recessed grooves matching each of the injection openings. The width of each groove matches the diameter of an injection opening, with a stepped contour and a curved cross section.

Abstract: A thin film coating for a low allow steel or tool steel components in a fuel injector (14), such as a fuel injector needle valve (86) is disclosed. A thin film coating (96) consists of a metal carbon material layer less than 2.0 microns thick applied to a low alloy steel substrate (95) or tool steel substrate (95) used in fuel injector components, such as the fuel injector needle valve (86) or a portion thereof. Optionally, a thin bond layer (98) of chromium is deposited between the steel substrate (95) and the primary metal carbon material coating (96). The thin film coating (96) minimizes abrasive and adhesive wear associated with the needle valve (86) and cooperating nozzle surfaces (62,63) of the fuel injector (14).

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

Abstract: A fuel 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: An object of the present invention is to obtain a consistently stable needle lift damping effect in an injector 8b for fuel injection. In an injector 8b that relieves fuel pressure inside a pressure control chamber 37 and lifts a needle valve 36, there are provided a damper member 62 that is slidably mounted to the needle valve 36, a damping chamber 63 formed between the damper member 62 and the needle valve 36, a leak passage 64 for extracting and leaking out the fuel in the damping chamber 63, and a stopper member 41 to restrict the lift position of the damper member 62. Damping of the lift of the needle valve 36 is carried out by extracting and leaking out the fuel in the damping chamber 63 through the leak passage 64. The needle valve 36 functions as a guide for the damper member 62, and prevents vibration of the damper member 62, allowing a consistently stable damping effect to be obtained.

Abstract: The invention relates to an injection valve, comprising a control chamber (15) with a control piston (16) that is functionally linked with a nozzle needle (35). The control chamber (15) is linked, via an inlet throttle (13), with pressurized fuel, and with an outlet throttle (14) with a valve chamber (9). A servo valve (5) is disposed in the valve chamber (9), said servo valve opening a connection between the valve chamber (9) and a return element (40) depending on its position. The inventive injection valve further comprises a bypass throttle (12) that is interposed between the fuel feed line and the valve chamber.

Abstract: In a fuel injection valve, a flow-out passage is provided on a downstream side thereof with an out-orifice. The out-orifice is provided around a periphery of an inlet opening thereof with an inlet circumferential edge with which a flow of fuel to be ejected from a pressure control chamber via the out-orifice is swirled so that turbulent flow is forcibly formed. Then, the turbulent flow is maintained until the fuel is ejected. Dimensions of the out-orifice satisfy the formulas, R/D≦0.2 and L/D≦1.2, where R is corner radius of the inlet circumferential edge of the out-orifice, D is inner diameter thereof and L is axial length thereof. Accordingly, fuel injection is stable with less fuel amount fluctuation in each cycle even when fuel pressure and temperature are relatively low.

Abstract: A fuel injector, in particular for the direct injection of fuel into the combustion chamber of a mixture-compressing, externally fired internal combustion engine, comprising, upstream from a valve-seat surface, a swirl disk provided with swirl channels from which, given an open fuel injector, the fuel flows with a circumferential speed into a swirl chamber which is also located upstream from the valve-seat surface. Each point downstream from the swirl disk (35) through which a flow is to pass has a larger extension in every spatial direction than the diameter of the swirl channels.

Abstract: Metering components of a fuel injector that allow spray targeting and distribution of fuel to be configured using non-angled or straight orifice having an axis parallel to a longitudinal axis of the fuel metering components. Metering orifices are located about the longitudinal axis and defining a first virtual circle greater than a second virtual or bolt circle defined by a projection of the sealing surface onto the metering disc so that all of the metering orifices are disposed outside the second virtual or bolt circle within one quadrant of the circle. A channel is formed between the seat orifice and the metering disc that allows the fuel injector to generate a spray pattern along the longitudinal axis that forms a flow area on a virtual plane transverse to the longitudinal axis.

Abstract: A control module (1) for an injector of an accumulator injection system is used to control and guide a valve body (8). The control module comprises a high pressure supply line (2) for supplying fuel, and a guiding device (3) for guiding the valve body (8). A control room (4), an inlet throttle (5) and an outlet throttle (6) are also provided. The inlet throttle (5) connects the high pressure supply line (2) to the control chamber (4) and the outlet throttle (6) connects the control chamber (4) to a control valve (15). A control piston (7) is arranged in the control chamber (4), the end of the control piston opposite the control chamber (4) being connected to a high pressure region (9) on the valve body (8).

Abstract: In a fuel injection valve including a flat fuel diffusion chamber provided between a valve seat member and an injector plate to widen radially outwards from an outer end edge of a valve seat bore, an annular step is formed on a ceiling surface of the fuel diffusion chamber so that a level of the ceiling surface is gradually lowered radially outwards, and fuel injection orifices are disposed immediately below the step and at a distance from an inner peripheral wall of the fuel diffusion chamber. Thus, a fuel spread radially in the fuel diffusion chamber is allowed to collide with the annular step, leading to an enhancement in fuel diffusing effect, so that it is possible to further promote the atomization of the fuel injected from the fuel injection orifices and to form more stable fuel spray forms.

Abstract: A fuel injector for use in a fuel injection system of an internal combustion engine that includes a body, valve seat, closure member, orifice plate and metering device. The closure member and the valve seat define a sealing surface, located on a virtual circle defining a sealing diameter. The orifice plate includes a third surface, a fourth surface and at least one orifice, located on a virtual circle on the orifice plate defining a first radius and between the third and fourth surfaces. The metering device has first and second faces contiguous to a third face. At least one of the first and third faces are spaced from one of the first and second surfaces of the valve seat to define a plurality of passages. Each passage has an outlet located on a virtual circle defining a second diameter greater than at least one of the first and the sealing diameters.

Abstract: A control device of a fuel injection valve is capable of performing a stable fuel injection even if voltage variation takes place in battery, and performing evacuation operation against error in switching element or auxiliary power supply. The control device includes: an auxiliary power supply 6 for stepping up voltage of main power supply 1; a first switching element 20 for performing rapid power supply from auxiliary power supply 6 to electromagnetic solenoid 27; a second switching element 24 for performing continuous power feed from main power supply 1 to electromagnetic solenoid 27, and implementing ON/OFF control to perform holding power feed; a third switching element 26 for interrupting current of these power feeds; and a control device for controlling the power feeds. Power feed is normally performed in order of rapid power feed, continuous power feed and hold power feed.

Abstract: The invention relates to an injection valve, comprising a control chamber (15) with a control piston (16) that is functionally linked with a nozzle needle (35). The control chamber (15) is linked, via an inlet throttle (13), with pressurized fuel, and with an outlet throttle (14) with a valve chamber (9). A servo valve (5) is disposed in the valve chamber (9), said servo valve opening a connection between the valve chamber (9) and a return element (40) depending on its position. The inventive injection valve further comprises a bypass throttle (12) that is interposed between the fuel feed line and the valve chamber.

Abstract: The fuel injection system has a feed pump (12), by which fuel is pumped out of a fuel tank (10) to the intake side of a high-pressure pump (14); the high-pressure pump (14) pumps fuel into a reservoir (16) as a function of engine operating parameters. A fuel metering device (44) is provided for adjusting the fuel quantity pumped into the reservoir (16) by the high-pressure pump (14). An electrically actuated blocking valve (46) is disposed between the feed pump (12) and the high-pressure pump (14), and by means of this valve the high-pressure pump (14) can be disconnected completely from the feed pump (12). By means of the blocking valve (46), it can still be attained that no fuel is pumped by the high-pressure pump (14) even if the fuel metering device (44) does not provide complete sealing.

Abstract: The nitrous oxide injection tube 18 is formed with delivery ports 24 that include interior bores 38 that communicate with the internal passage 26 of the injection tube and larger external bores 40 that extend through the exterior surface 27 of the injection tube. The external bores are each angled toward the position of the entrance of a fuel runner that communicates with a cylinder of a combustion engine so that the nitrous oxide and the fuel carried by it are more uniformly distributed to each cylinder.

Abstract: A fuel injector having a piezoelectric actuator, which activates a shutter to move the shutter in a work direction between a closed position and an open position; the piezoelectric actuator is housed inside a casing having an inner chamber insulated from the fuel, and an outer surface wet by the fuel.

Abstract: The invention relates to a device for actuating a control piston or nozzle needle (27) via a control chamber (26). The control chamber communicates via a control chamber line (25) with valve chambers (3, 22) of a 3/2-way valve (5). The valve body (6, 40, 51) of this valve is switchable by means of an actuator (11). By means of a restoring spring (14), the valve body (6, 40, 51) is acted upon such that a seat portion (7), embodied in the housing (4) on the valve body (6, 40, 51), is put into its valve seat (20). The valve body (6, 40, 51) of the 3/2-way valve (5) has a seat portion (7) and a longitudinal slide portion (8), as well as hydraulic faces (31,32), facing one another, that make the state of pressure equilibrium of the valve body (6, 40, 51) possible. The valve body (6, 40, 51) is moved to different stroke lengths (10; 23, 24) by means of an actuator (11).

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

Abstract: A method of manufacturing a fuel injector is disclosed. The method includes assembling a power group assembly with a valve group assembly to form the fuel injector. The power group assembly includes an overmold formed over a coil assembly. The valve group assembly includes a tube assembly formed by connecting an inlet tube to a valve body. The valve body includes a seat, a lower guide, and an armature/ball assembly disposed within the valve body. A retention member can be used to retain the power group assembly to the valve group assembly.

Abstract: A fuel injector includes a homogenous charge nozzle outlet set and a conventional nozzle outlet set controlled respectively, by first and second needle valve members. One of the needle valve members moves to an open position while the other needle valve member remains stationary for a homogeneous charge injection event. The former needle valve member stays stationary while the other needle valve member moves to an open position for a conventional injection event. One of the needle valve members is at least partially positioned in the other needle valve member. Thus, the injector can perform homogeneous charge injection events, conventional injection events, or even a mixed mode having both types of injection events in a single engine cycle.

Abstract: In a sliding structure in which a shaft member is retained slidably in a guide hole, the lack of an oil film caused by the edge contact of the shaft member to which a pressing load in the axial direction is applied is prevented. With the fact being taken into account that end portions 25c1 and 25c2, which are always in slidable contact with a side surface 1232a of a guide hole 1232, of a side surface 25c of a shaft member 251 are the partial edge portion, a plurality of labyrinth grooves 2501 and 2502 are formed in the end portions 25c1 and 25c2, respectively, thereby it is possible for an oil film to cover the entire contact portion without increasing the groove width extremely. Because the groove width is not increased extremely, the length of the sliding portions can be ensured.

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 injection nozzle is proposed, in which an inner nozzle needle and an outer nozzle needle can be actuated independently of one another. Upon opening of the outer nozzle needle, a stream of fuel is injected into the combustion chamber in the direction of the longitudinal axis of the fuel injection nozzle, while upon opening of the inner nozzle needle, the fuel is injected laterally into the combustion chamber.

Abstract: A dual fuel injection valve separately and independently injects two different fuels into a combustion chamber of an internal combustion engine. A first fuel is delivered to the injection valve at injection pressure and a second fuel is either raised to injection pressure by an intensifier provided within the injection valve, or delivered to the injection valve at injection pressure. Electronically controlled valves control hydraulic pressure in control chambers disposed within the injection valve. The pressure of the hydraulic fluid in these control chambers is employed to independently actuate a hollow outer needle that controls the injection of the first fuel. Disposed within the outer needle is an inner needle that controls the injection of the second fuel. The outer needle closes against a seat associated with the injection valve body and the inner needle closes against a seat associated with the outer needle.

Abstract: A fuel injection valve for internal combustion engines, having a housing (1) in which an outer valve needle (20) and an inner valve needle (22) guided in it are disposed in a bore (16). The outer valve needle (20), by a longitudinal motion, controls an outer row (130) of injection openings, and the inner valve needle (22), likewise by means of a longitudinal motion, controls an inner row (230) of injection openings, to which rows (130; 230) of injection openings fuel is delivered at an injection pressure through a high-pressure conduit (10) embodied in the housing (1). A control pressure chamber (52) is embodied in the housing (1); it can be made to communicate with the high-pressure conduit (10), and by means of its pressure, a closing force is exerted at least indirectly on the inner valve needle (22).

Abstract: A fuel injector (1) having a chamber (7) with a fuel inlet (8) and a plurality of fuel outlets (10), and including a fuel distributor (18) that is arranged in the chamber (7) for the purpose of distributing fuel introduced into the chamber (7) via the fuel inlet (8) to the outlets (10). The fuel distributor (18) includes a generally rotary symmetric distributor body (19).

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

Abstract: In a fuel injection nozzle having a nozzle body, a nozzle needle that is displaceable in the nozzle body, a piezoelectric actuator that is connected to the nozzle needle, and a compensation piston on which the piezoelectric actuator is braced and which protrudes into a compensation chamber that is filled with a fluid, where the compensation chamber communicates with a supply volume through an inlet of small cross section, a simpler design is to be attained. To that end, it is provided that the supply volume is subjected to variable pressure making it possible to dispense with a separate restoring spring for the nozzle needle.

Abstract: A fuel injection device having a fuel pump for each cylinder of an internal combustion engine, which fuel pump has a pump piston that is driven in a stroke motion by the engine and delimits a pump working chamber, which is connected to a fuel injection valve that constitutes a structural unit with the fuel pump and has an injection valve member, which controls at least one injection opening and can be moved in the opening direction counter to a closing force by the pressure generated in the pump working chamber. A first electrically actuated control valve controls a connection of the line to a discharge chamber. A second electrically actuated control valve controls a connection of a control pressure chamber of the fuel injection valve to the pump working chamber, by means of which the injection valve member is at least indirectly acted on in the closing direction.

Abstract: A common rail injector is proposed which offers great freedom in designing the course of the preinjection main injection and of the injection pressure. Moreover, it offers improved security against leaks into the combustion chamber, caused for instance by a leaking nozzle needle valve seat.

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: An electromechanical fuel injector for an internal combustion engine. The fuel injector includes a pump unit and a control valve assembly in communication with the pump unit. The control valve assembly including a body and a stator. The fuel injector also includes a stator nut cooperable with the valve body to secure the stator to the valve body and at least one expansion tank to accumulate pressure created by the pump unit. The fuel injector may also include a spacer.

Abstract: A nozzle needle of a fuel injector is driven in a controlled manner by changing back pressure applied thereto. The back pressure is controlled by a pressure control valve driven by stacked piezoelectric elements. A valve body of the pressure control valve is disposed in a valve chamber having a drain port and a high pressure port which are selectively closed. A diameter D1 of a drain seat, a diameter D2 of a high pressure seat, and a diameter D3 of a piston portion connected to the valve body are set to satisfy a relation: D1≧D2≧D3. In this manner, operation of the pressure control valve is stabilized, and thereby the fuel injector is smoothly and stably operated.

Abstract: A fuel nozzle assembly for delivering fuel to a combustor of a gas turbine engine. The assembly includes a fuel nozzle including a body having a fuel inlet, an air inlet, an outlet for discharging fuel to the combustor, and a mounting flange for mounting the nozzle in the engine. A portion of the body corresponding to the fuel inlet and/or the air inlet includes a recess for receiving a supply fitting having an annular sealing surface and a rotatable nut. The recess includes an annular seat sized and shaped for sealingly engaging the sealing surface of the supply tube fitting and female threads positioned adjacent the seat for threadably receiving the rotatable nut of the supply.

Abstract: A fuel injector (1) for the direct injection of fuel into the combustion chamber of an internal combustion engine encompasses a piezoelectric or magnetostrictive actuator (3), a valve needle (10) actuable by the actuator (3), the valve needle (10) cooperating with a valve-closure member (17) to form a sealing seat (25) together with a valve-seat member (18), and a restoring spring (20) by which the valve needle (10) is acted on in a closing direction. The valve needle (10) is pressure-equalized in that the force exerted by the fuel pressure on the valve needle (10) in the opening direction is approximately equal to the force exerted by the fuel pressure on the valve needle (10) in the closing direction.

Abstract: The present invention broadly applies to any fluid valve made up of a plurality of body components that create sealing lands where the body components are clamped together. The invention is further applicable to any such valves in which pressure differentials within the valve can cause fluid leakage in the region of these sealing lands. Fluid leakage is reduced by locating at least some of these sealing lands within a hollow clamp that holds the valve body components together. This clamping strategy that locates the clamping load where it is needed most is applicable to a wide variety of valves, but is particularly applicable to pressure control valves used in fuel injection systems that experience extremely high pressure differentials during their usage.

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

Abstract: A fuel injection system having a housing (2), in which a pump piston (16) is disposed longitudinally movably, which piston positively displaces fuel from a pump work chamber (18) and delivers it to a pressure chamber (14). In a bore (42), an outer valve needle (44) is disposed longitudinally displaceably and cooperates with a valve seat, embodied on the end toward the combustion chamber of the bore (42), to control the opening of an outer row (70) of injection openings. The outer valve needle (44) experiences an opening force oriented away from the valve seat (48), as a result of the pressure in the pressure chamber (41), and a closing force, as a result of the force of an outer closing spring (52) disposed in an outer spring chamber (54). In the outer valve needle (44), an inner valve needle (46) is guided longitudinally displaceably, which likewise cooperates with the valve seat (48) to control an inner row (72) of injection openings.

Abstract: A fuel injector (1) for the direct injection of fuel into the combustion chamber (18) of a mixture-compressing, spark-ignition internal combustion engine includes a nozzle body (2) and a sealing ring (15) which seals off the fuel injector (1) from a cylinder head (11) of the internal combustion engine. An adhesion-reducing coating (17) is provided in an annular gap (14) formed between a wall (13) of the cylinder head (11) and the nozzle body (2) of the fuel injector (1).

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: An injection device for injecting fuel comprises a nozzle needle (2), which is arranged in a nozzle body (1), and a micro-bore (10) formed in the nozzle body (1), in which at least one injection hole (8) is configured. Here one tip (3) of the nozzle needle (2) projects into the micro-bore (10) in such a way that the tip (3) is arranged at the level of the injection holes (8) in the axial direction (X-X) of the nozzle needle, with recesses being formed in the tip at the tip (3) of the nozzle needle (2) level with the injection holes (8), in order to ensure a minimum distance between the tip (3) and the injection holes (8).

Abstract: A nozzle, especially an atomizing nozzle for an oil burner, has a housing with a nozzle opening, and a distributing insert which from the interior of the housing lies on the housing in the area of the nozzle opening and is held in the housing with the help of a deformed housing section. To better assure the functioning of the nozzle an elastically deformable element is arranged between the housing section and the distributing insert.

Abstract: At least one method of degasifying, filling fluid and assembling a hydraulic compensator for a solid state actuated fuel injector is disclosed. The method involves partially assembling a compensator assembly and immersing the partial assembly in a hydraulic fluid and under a vacuum for a first predetermined time period. The partially assembled compensator is then assembled while immersed in the fluid and under a vacuum for a second time period.

Abstract: A fuel injection system has the ability to produce two different spray patterns depending on the positioning of a needle control valve member. Positioning of the needle control valve member determines which of the two needle control chambers are placed in a low pressure condition. First and second needle valve members have closing hydraulic surfaces exposed to fluid pressure in the two needle control chambers. The injector preferably includes a homogenous charge nozzle outlet set and a conventional nozzle outlet set controlled respectively, by the first and second needle valve members.

Abstract: A fuel injection valve for internal combustion engines, having a housing (1) that has a first body (3) and a second body (7), which contact one another at least indirectly, each by a respective contact face (103; 107) and are pressed against one another by a screw sleeve (10). With a female thread (42) the screw sleeve (10) engages a male thread (8) of the first body (3) and with a pressure face (32) the screw sleeve rests on a contact face (34) of the second body (7), and the screw sleeve (10) is embodied at least approximately cylindrically and surrounds the two bodies (3; 7) in the region of the contact faces (103; 107). The screw sleeve (10), on its outer jacket face and over a majority of its length, has an outer contour that can be engaged by a screwing tool, so that with the screwing tool, a tangential force can be exerted on the screw sleeve (10) (FIG. 1).

Abstract: An injection valve for an internal combustion engine, with a nozzle body in which a nozzle needle is guided axially displaceably. An at least one-piece holder body is provided, in which means for actuating the nozzle needle are disposed. The nozzle body has means, which correspond with a holding tool for holding the nozzle body in a defined position relative to the holder body during an assembly.

Abstract: A fuel injector, in particular for direct injection of fuel into the combustion chamber of a mixture-compressing, spark-ignited internal combustion engine, comprises an armature that coacts with a magnet coil, and comprises a valve needle, joined to the armature, on which is provided a valve-closure member that, together with a valve seat surface, forms a sealing seat. The valve needle has, downstream from the armature, a clamping sleeve whose axial position on the valve needle determines the height of a pre-stroke gap configured between the armature and an engaging flange that is joined nonpositively to the valve needle, the clamping sleeve being of tubular configuration and having a slit extending in the axial direction.

Abstract: A fuel injector, in particular for direct injection of fuel into a combustion chamber of an internal combustion engine, having an actuator for actuating a valve needle, the valve needle having on one injection end a valve-closure member which forms a sealing seat together with a valve-seat surface formed on a valve-seat member. Fuel channels are provided in a valve needle guide which is designed in one piece with or is connected to the valve-seat member and they open into a swirl chamber. The number of fuel channels is such that a turbulent flow produced in the swirl chamber is homogeneous in a circumferential direction.