EP1030967B1 - Fuel injector - Google Patents

Description

State of the art

The invention is based on a fuel injector according to the genus of the main claim.

From US Pat. No. 5,156,124 is already a Fuel injector known to be electromagnetic can be actuated. For this purpose, the fuel injector usual components of an electromagnetic circuit, such as a magnetic coil, an inner pole and an outer pole. at this known injection valve is a so-called side feed injector, in which the Fuel supply largely below the magnetic circuit he follows. Contact pins protrude from the solenoid out of the fuel injector, which has a certain length encapsulated with plastic and in this are embedded. The plastic extrusion is on one End of the fuel injector applied and provides not an independent component of the injection valve.

The same applies to what is known from DE-OS 34 39 672 Fuel injector. Also protrude from here Magnetic coil outgoing contact pins to an electrical Connector that is made of plastic and the Partially surrounds contact pins behind the solenoid. The the injection molding forming the connector is there sprayed onto the metal valve housing.

In the unpublished DE-P 197 12 591.3 it has already been proposed Fuel injector from two pre-assembled assemblies, a functional part and a connecting part, put together, manufactured and adjusted separately and subsequently firmly connected to each other. With the Connecting both assemblies will also be electrical and created a hydraulic connection. Adding the both assemblies are made using ultrasonic welding, Glue or flare.

Such a fuel injector is also out DE-A-3 834 444 known (see Figure 3).

Advantages of the invention

The fuel injector according to the invention with the characterizing features of claim 1 has the advantage that it can be manufactured inexpensively in a simple manner and can be installed safely and reliably. In advantageous Way, a great mechanical stability of the Fuel injector reached. In addition is ensures that electrical connectors within of the valve is safe and protected.

In addition, variations in the designs of the Fuel injector are made. this will thereby achieved that two assemblies of Fuel injector, a functional part and a Connection part, pre-assembled separately from each other or can be set. The functional part includes essentially an electromagnetic circuit and an off Valve seat body and valve closing body formed Sealing valve. In the connection part, however, are the electrical and the hydraulic connection of the injection valve intended. All described embodiments of the Fuel injectors have the advantage of one inexpensive to manufacture with a great many Design variants. Largely in large numbers identical (differences e.g. in the size of the Valve needle strokes or the number of turns of the solenoid) manufactured functional parts can with many various connecting parts, for example in the Size and shape, in the design of the electrical Connector, in the formation of the lower end face of the connector or also in terms of their color, their Marking, their label or another Differentiate labeling, be connected. The logistics in the manufacture of fuel injectors basically simplified.

The separation into two modules results in Advantage that all negative influences when manufacturing the largely made of plastic connector (large Overmolding pressures, heat development) of which the important ones Components of the functional part that perform valve functions be kept away. The relatively dirty one Overmolding process can advantageously outside the assembly line of the functional part.

By the measures listed in the subclaims advantageous developments and improvements in Claim 1 specified fuel injector possible.

It is particularly advantageous for the extrusion coating Establishing a firm connection between the two assemblies to choose a plastic that is at a higher temperature has its melting point than that for the connector used plastic. This ensures that a polymeric connection between the two plastics is received. It is advantageous to use the outer circumference of the To carry out a labyrinth seal. At the Overmoulding is achieved so that a heat distribution allows good melting. It is also achieved that high mechanical stability in this area and thus of the entire fuel injector and a good one Tightness are guaranteed.

It is an advantage that all important valve functions performing the functional part very briefly. In This advantageously results in simplified access to the parts of the injector to be set. In front all things there are clearly shortened ways for that Introduction of measuring arrangements, e.g. from probes to Measurement of the stroke of the valve needle or tools for Setting the dynamic spray volume on the Adjustment.

Advantageously, the connector on the downstream end several axially projecting segments be provided, which after the molding process in the Protrude extrusion. Through this into the extrusion coating protruding segments, the heat dissipation during the Overmolding process improved. At the same time, the hot volume kept quite small in the molding process. This allows significantly reduce the molding cycle time. Moreover is advantageously the mass accumulation within the Overmolding reduced. The formation of voids can be done in this way be reduced effectively. Through the segments arise also turbulence in the flowing plastic. this leads to increased strength of the entire extrusion coating.

It is advantageous to have a fuel filter in the functional part to arrange. It lends itself as a mesh screen Use metal filter cloth. Until the final assembly of the Valve is thus guaranteed that no dirt particles in get inside the functional part.

A very large variation of the electrical connecting elements on the functional part and Be made connector. It is always like that possible to connect the electrical connectors on both Functional part as well as on the connecting part either plug-like or socket-like or as a combination to train both possibilities.

drawing

Embodiments of the invention are in the drawing shown in simplified form and in the following Description explained in more detail. 1 shows a first Fuel injector according to the invention with two independently pre-assembled modules in the assembled state, 2 shows a connecting part representing the first assembly of the valve according to Figure 1, Figure 3 a the second assembly representative functional part of the valve according to FIG. 1, Figure 4 shows a second embodiment of a Functional part, Figure 5 is an electrical Connection area in a schematic representation, Figures 6A to 6C three embodiments for contact pins accordingly a section along the line VI-VI in Figure 5, Figures 7A to 7D four embodiments for contact sockets corresponding to a section along the line VII-VII in Figure 5, Figure 8 shows a second embodiment of a Connection part, Figure 9 is a bottom view of the Connection part according to Figure 8 and Figure 10 is a bottom view to another connector.

Description of the embodiments

This is exemplarily and partially simplified in FIG. 1 shown electromagnetically actuated according to the invention Valve in the form of an injector for Fuel injection systems from mixture-compressing, spark-ignited internal combustion engines has one of one Magnetic coil 1 surrounded, as an inner pole and partially as Fuel flow serving largely tubular Core 2. The magnetic coil 1 is from an outer, sleeve-shaped and stepped, z. B. surrounded ferromagnetic valve jacket 5 as the outer pole, the completely surrounds the magnetic coil 1 in the circumferential direction. The Form solenoid 1, the inner pole 2 and the outer pole 5 together an electrically excitable actuator. As another training variant, not shown, can the actuating element can also be used as a piezo actuator be executed.

While the magnet coil embedded in a coil body 3 1 surrounds a valve sleeve 6 from the outside, the core 2 is in an inner, concentric to a longitudinal valve axis 10 extending opening 11 of the valve sleeve 6 introduced. The e.g. ferritic valve sleeve 6 is elongated and thin-walled and has a jacket section 12 and a bottom portion 13, the shell portion 12 in Circumferential direction and the bottom portion 13 in the axial Direction at its downstream end the opening 11 limit. The opening 11 also serves as a guide opening for one axially movable along the valve longitudinal axis 10 Valve needle 14.

In addition to the core 2 and the valve needle 14 is in the opening 11 further arranged a valve seat body 15 which e.g. sits on the bottom portion 13 of the valve sleeve 6 and has a fixed valve seat surface 16 as a valve seat. The Valve needle 14 is, for example, of a tubular Anchor section 17, also tubular Needle section 18 and a spherical Valve closing body 19 is formed, the Valve closing body 19 e.g. by means of a weld seam is connected to the needle section 18. At the is downstream end of the valve seat body 15 z. B. in a frustoconical recess 20 a flat spray plate 21 is arranged, the fixed Connection of valve seat body 15 and spray orifice plate 21 z. B. realized by a circumferential dense weld is. In the needle section 18 of the valve needle 14 there are one or several transverse openings 22 are provided so that the Anchor section 17 in an inner longitudinal bore 23 fuel flowing through to the outside and on Valve closing body 19 e.g. along flats 24 to can flow to the valve seat surface 16.

The injection valve is actuated in a known manner Way, here for example electromagnetic. A Actuation by means of a piezo actuator is also conceivable. to axial movement of the valve needle 14 and thus for opening against the spring force of one on the valve needle 14 attacking return spring 25 or closing the Injector serves the electromagnetic circuit with the Solenoid 1, the inner core 2, the outer valve jacket 5 and the anchor section 17. The anchor section 17 is with the end facing away from the valve closing body 19 onto the core 2 aligned.

The spherical valve closing body 19 interacts with the tapered in the direction of flow Valve seat surface 16 of the valve seat body 15 together, the in the axial direction downstream of a guide opening in Valve seat body 15 is formed. The spray hole disc 21 has at least one, for example four through EDM, laser drilling or stamping molded Spray orifices 27.

The insertion depth of the core 2 in the injection valve is below other decisive for the stroke of the valve needle 14 the one end position of the valve needle 14 is not at excited solenoid 1 by the system of Valve closing body 19 on the valve seat surface 16 of the Valve seat body 15 set while the other End position of the valve needle 14 when the solenoid coil 1 is excited by the installation of the anchor section 17 on the downstream Core end results. The stroke is set by a axial displacement of the core 2, which corresponds to the desired position subsequently firmly with the valve sleeve 6 is connected.

In a concentric to the valve longitudinal axis 10 Flow bore 28 of the core 2, which is the supply of the Serves fuel in the direction of the valve seat surface 16 is in addition to the return spring 25, an adjusting element in the form an adjusting spring 29 inserted. The adjusting spring 29 is used to adjust the spring preload on the Adjustment spring 29 adjacent return spring 25, which itself again with its opposite side on the Valve needle 14 supports, with an adjustment of the dynamic spray quantity with the setting spring 29. The adjusting element can also be used instead of an adjusting spring be designed as adjusting bolts, adjusting sleeves etc.

The injection valve described so far stands out through its particularly compact structure, so that a very small, handy injection valve is created. These components form a pre-assembled standalone assembly that hereinafter called functional part 30 and in Figure 3 as such assembly is shown separately again. The Functional part 30 essentially comprises the electromagnetic circuit 1, 2, 5 and a sealing valve (Valve closing body 19, valve seat body 15) with a following jet processing element (spray orifice plate 21).

The between the valve jacket 5 and the valve sleeve 6 formed and almost completely by the magnetic coil 1 filled coil space is in the valve seat body 15 facing direction through a stepped radial region 32 of the valve jacket 5 limited, while the conclusion on the the side facing away from the valve seat body 15 by a disc-shaped cover element 33 is guaranteed. In a recess of the cover member 33, this is from the Extends through coil body 3. Stand in this area for example two contact pins or sockets 34 from the Plastic of the bobbin 3 and thus from the Functional part 30 out. Via the electrical contact pins or sockets 34 that act as electrical connectors serve, the electrical contacting takes place Magnetic coil 1 and thus its excitation.

A second is completely independent of the functional part 30 Manufactured assembly, the following as a connector 40th referred to as. The independent and pre-assembled Connection part 40 is mounted in Figure 1 with the Functional part 30 as part of the entire injection valve and shown separately in Figure 2. The Connection part 40 is characterized above all by that it is the electrical and hydraulic connection of the Includes fuel injector. That largely as Plastic part made connector part 40 therefore has a tubular serving as a fuel inlet port Base body 42. In a concentric to the valve longitudinal axis 10 extending flow bore 43 of the base body 42 by the upstream end of the fuel injector is flowed through by the fuel in the axial direction for example, a fuel filter 44 inserted or pressed. The fuel filter 44 protrudes into the Flow bore 43 of the base body 42 at its inlet end and ensures the filtering out such fuel components, due to their size in Injector blockages or damage could cause.

A hydraulic connection of connector 40 and Functional part 30 is in the fully assembled Fuel injector achieved in that the Flow bores 43 and 28 of the two assemblies to one another brought that an unimpeded flow through the Fuel is guaranteed. An inner opening 46 in Cover element 33 allows the valve sleeve 6 and thus also form the core 2 so that both the opening 46 protrude and at least the valve sleeve 6 towards Connection part 40 clearly above the cover element 33 also available. When mounting the connector 40 on the Functional part 30 can have a lower end region 47 of the Base body 42 in the protruding part of the valve sleeve 6 to increase the connection stability in the opening 11 of the Extend valve sleeve 6.

The end region 47 of the connecting part 40 is, for example stepped, the base body 42 on a lower end face 58 strong from the outside diameter rejuvenated. Limited together with a lower ring collar 49 the end face 58 an annular groove 50, in which a sealing element, e.g. an O-shaped sealing ring 51 is arranged. in the The connection area of both assemblies 30 and 40 is thus adequate sealing is guaranteed.

In addition, two electrical are in the connector 40 Contact elements 55 provided during the Plastic injection molding process of the base body 42 encapsulated and are then embedded in the plastic. To serve largely as a fuel inlet port Base body 42 made of plastic also belongs co-molded electrical connector 56. The electrical contact elements 55 end at one end as exposed contact pins 57 of the electrical Connector plug 56, with a corresponding not shown electrical connection element, such as. B. one Contact strip, for complete electrical contacting of the injection valve can be connected. At their the Connectors 56 opposite ends run the Contact elements 55 to the lower end face 58 of the Connection part 40 and form an electrical there Connecting element 59, the z. B. as also exposed Contact pins is executed. When fully assembled The fuel injector act on the electrical Connectors 34 and 59 together so that a safe electrical connection is established, the contact pins 59 z. B. in the socket-like, eyelet-like, bracket-like, pin-shaped or cable lug-shaped connecting elements 34 intervene on functional part 30. Examples of this are in the Figures 5 to 7 shown. About the electrical Connector 56 and the electrical Connection area 34, 59 is thus electrical Contacting the solenoid 1 and thus its excitation.

Figures 2 and 3 show the two independent and Functional parts 30 and Connection part 40 before the final assembly of the Fuel injector. It is meant to be explicit be noted that both the functional part 30 and also the connecting part 40 individually modular can be built, which means that for simplified Manufacturing and assembly of the assemblies 30 and 40 certain Subassemblies can be used. For one further modular subdivision is described below for the Assembly 30 and 40 each given an example in the Figures are not shown in detail.

In Figure 2 is a dash-dot line possible module dividing line 64 indicated, which should show that the connector 56 can also be made variable, to then be used on different base bodies 42 become. With such a configuration, therefore for the time being the hydraulic connection (base body 42 with Flow hole 43) and the electrical connection (Connector 56 with contact pins 57) separated from each other in front. The two only result in the assembled state Subassemblies the connector 40 described secure electrical connection of the two subassemblies are corresponding to each other in the connection area electrical connectors provided that run can be like the electrical connecting elements 34 and 59. The fixed connection of the subassemblies is by Welding, soldering, gluing or overmolding realized.

In this respect, the functional part 30 can also consist of modular ones Subassemblies, e.g. the Beam preparation element in the form of the spray perforated disk 21 is initially installed in a separate injection assembly, which is only subsequently integrated on the functional part 30. It is useful, e.g. multilayer, by means of so-called multilayer electroplated perforated disks in the injection assembly, which is a disc-shaped Perforated disc carrier can be used. The perforated disks can have opening contours with which very different spray patterns or a swirl application of the spray can be generated. The versatile one Spray assembly can, for example, by means of (laser) Welding downstream of the valve seat 16 am Valve seat body 15 or a housing part of the Functional part 30 be attached. Similar to that in the DE-P 197 12 591.3 an inclination of the whole Functional part 30 has been proposed, the Spray assembly with the spray plate 21 e.g. aslant inclined to the longitudinal axis as a subassembly on the functional part 30 may be provided.

The two modules functional part 30 and connecting part 40 after the corresponding pre-assembly in a last Process step firmly connected. This will be Connection part 40 so far into the opening 11 of the valve sleeve 6 introduced in the functional part 30 until the end face 58 comes to a stop, for example, on the valve sleeve 6, with which already the hydraulic connection of both assemblies 30, 40 with the appropriate seal through the sealing ring 51 is realized on the valve sleeve 6. Thereby the electrical connection of both assemblies 30, 40 established, since the electrical connectors 34 and 59 both Interlocking sides (Figure 1).

According to the preassembled assemblies 30, 40 in the connection area for the mechanical connection of both Assembled assemblies 30, 40. It is ring-shaped on outer circumference of the valve sleeve 6 the volume between the lower end face 58 of the connector 40 and the Cover element 33 of the functional part 30 to the outer Circumference of the base body 42 or the valve jacket 5 with Plastic filled so that a flush to the outside Conclusion is formed (Figure 1). Through this extrusion 60 the electrical connecting elements 34, 59 are safe before the influences of the engine compartment (dirt, fuel) protected.

For the encapsulation 60 designed as a "belly bandage" a plastic chosen that is at a higher temperature has its melting point than that for the connector 40 used plastic so that a polymeric compound between the two plastics. Above the end face 58 is the outer circumference of the base body 42 designed as a labyrinth seal 61, in which there are several Grooves or furrows 62 in a ring on the circumference of the base body 42 extend. The material between the individual furrows 62 should be fairly pointed radially outward to when molded, a heat distribution in this To create connection area that melts well allows. In addition, the one achieved by the furrows 62 provides larger surface area for a very secure connection of the two plastics is achieved, with which a high mechanical stability in this area and thus the entire fuel injector and good tightness are guaranteed.

On the other hand, the quality of the connection between the Overmolding 60 made of plastic and the metal Functional part 30 improved in that at the top, the Connection part 40 facing end 63 of the valve jacket 5 e.g. several grooves are screwed in or rolled up.

Figure 4 shows a second embodiment of a Functional part 30. The compared to that in Figure 1 and 3rd illustrated embodiment constant or components with the same effect are the same Reference numbers marked.

The fundamental difference compared to the previous one described embodiment is that a Fuel filter 44 'is arranged on the functional part 30, and either in addition to that already on the connector part 40 attached fuel filter 44 or advantageously instead of the fuel filter 44 on the connector 40. The Fuel filter 44 'is based, for example, on one Stage 66 of the valve sleeve 6 above the core 2. The one in Area of step 66 relatively large diameter of the opening 11 of the valve sleeve 6 allows the use of a Flat filter instead of one (shown in Figure 1) Basket filter. The mesh screen can also be curved, as can be seen from Figure 4. It offers itself as Screen mesh to use a metal filter cloth, which at a sufficient mesh size of 30 µm Has filter surface. While handling the pre-assembled functional part 30 to final assembly with the connector 40 is thus guaranteed that none Dirt particles in the interior of the functional part 30 reach.

Different ways of making electrical Connection between the two components 30, 40 are in the Figures 5 to 7 shown. 5 shows the electrical connection area with the electrical Connection elements 34, 59 in a schematic representation, while Figures 6A to 6C three embodiments for Contact pins 59 of the connector 40 corresponding to one Section along the line VI-VI in Figure 5 and Figure 7A to 7D four embodiments for contact sockets 34 of the Functional part 30 corresponding to a section along the Show line VII-VII in Figure 5.

The electrical connecting elements 59 of the connecting part 40 5 are pin-shaped as in FIGS Contact pins 59 executed. They have at their ends Contact pins 59, for example insertion bevels 68, with those who establish the electrical connection with the corresponding connecting elements 34 of the Functional part 30 is facilitated. Like Figures 6A to 6C can be removed, the cross sections of the contact pins 59 e.g. rectangular (Figure 6A), largely square (Figure 6B) or circular (Figure 6C).

Since in the case shown in FIG Connecting element 59 is designed pin-shaped, it is expediently the corresponding connecting element 34 Form bush-shaped to ensure safe and reliable to realize electrical connection. In Figure 7 are Examples of socket-like, eye-like, bracket-like, cable shoe-shaped, but also pin-shaped Connection elements 34 shown. The show the Magnetic coil 1 ends of the connecting elements 34 facing away also bevels 68 '. Figure 7A shows one conventional cable lug 70, the one like a clamp Can reach around pin 59. Different for inclusion Large contact pins 59, the cable lug 70 can be elastic be executed. FIG. 7B shows a double cable lug 71, which is used for two different contact pin types 59 can be. FIGS. 7C and 7D show two variants of one Profile connector 34, the connector 34 according to FIG. 7C as an L-profile pin 72 and that Connecting element 34 according to FIG. 7D as a flat profile pin 73 are executed. The latter two variants enclose the contact pins 59 to be contacted not, there is rather a contact through tight Issue. After making the electrical connection can also be fixed by an additional Spot welds are supported before overmolding 60 is attached.

Of course, it is also possible that electrical connecting elements 34 on the functional part 30 in Provide pin shape while the electrical Connecting elements 59 of the connecting part 40 rather Bush-like, loop-like or cable lug-shaped would. Another option is one at a time plug-like and socket-like connecting element 34, 59 on the functional part 30 and on the connecting part 40, which then interact with each other. A Electrical contacting can also be used, for example can be achieved with the CIN :: APSE® technology, with the Gold-coated molybdenum wires as a button contact are formed like a ball. This solderless Connection technology allows the very manufacturing reliable electrical connections that are mechanical are completely free of resonance.

Figure 8 shows a second embodiment of a Connection part 40. The opposite to that in Figure 1 or 2nd illustrated embodiment constant or components with the same effect are the same Reference numbers marked.

In comparison to the exemplary embodiment according to FIG. 2, this is Connection part 40 of Figure 8 especially in the area of End region 47 is formed modified. For example, is on the end face 58 a step 76 is provided, which as Guide covenant for those indicated with a dashed line Valve sleeve 6 of the functional part 30 is used. With an upper Sleeve section surrounds the valve sleeve 6 e.g. attached to the Stage 76 in the assembled state of the valve. Moreover stands from the end face 58 in the direction of Functional part 30 at least one segment 77 from the Connection part 40 out. The at least one segment 77 has thereby has an arcuate shape and is radial Viewed in the direction formed at a distance from the step 76, but not directly on the outer periphery of the connector 40, on which the one indicated with a dash-two-dot line Overmolding 60 completes.

In Figure 9 is a bottom view in the direction of arrow IX shown on the connecting part 40 according to Figure 8. It is to recognize that on the connecting part 40 three segments 77th are provided, all of which are designed in the shape of a circular arc are different, for example Have extension lengths in the circumferential direction. by virtue of the contact pins 59 this may be necessary. The Segments 77 are only a short distance apart.

Seen in the axial direction, the segments 77 are e.g. yet slightly beyond the central end region 47.

Several segments 77 thus extend from the connecting part 40 axially in the space for the fixed connection of the connecting part 40 and functional part 30 required extrusion 60. By Segments 77 the volume of the extrusion coating area is increased by approx. 30% and the maximum wall thickness of the extrusion coating 60 by approx. 50% compared to the extrusion coating 60 shown in FIG. 1 reduced. In Figure 8 it is indicated that the Segments 77 an inner overmold area 60a and Outer overmold area 60b result from the overmolding be filled with plastic, the two then extrusion sections created by plastic between the segments 77 or below the segments 77 are interconnected. In this way, the Segments 77 embedded after molding Overmolding 60 before. The segments 77 are arranged such that Mass accumulations within the extrusion coating 60 are eliminated and the wall thicknesses are even. Furthermore, it is advantageous to arrange the segments 77 so that when Overmolding a strong swirling of the flowing Plastic takes place.

Figure 10 shows another in a bottom view Embodiment of a connector 40. Here too three segments 77 projecting into the later extrusion coating 60 provided with a small segment 77 between the two Contact pins 59 is arranged and the other two Segments 77 in the shape of a circular arc, each over approximately 120 ° extend.

All described embodiments of the Fuel injectors have the advantage of one inexpensive to manufacture with a great many Design variants. Largely in large numbers identically manufactured functional parts 30 can with very many different connecting parts 40 that are for example in size, in the design of the electrical connector 56, etc. differentiate, get connected. The logistics in the manufacture of Fuel injectors are therefore fundamentally simplified.

Claims (16)

1. Fuel injection valve for fuel injection systems of internal combustion engines, with an excitable actuating element (1, 2, 5), with a movable valve-closing body (19) which cooperates with a valve seat (16) assigned to a valve-seat body (15), with an electrical connection (55, 56, 57) and with a hydraulic connection (42, 43), with a preassembled functional part (30) and a preassembled connection part (40), the functional part comprising essentially the actuating element (1, 2, 5), a sealing valve consisting of the valve-seat body (15) and of the valve-closing body (19), first electrical connecting elements (34) and first hydraulic connecting elements (28), and the connection part (40) possessing the electrical connection (55, 56, 57), the hydraulic connection (42, 43), second electrical connecting elements (59) and second hydraulic connecting elements (43), the functional part (30) and the connection part (40) forming independent subassemblies which are connected fixedly to one another by means of an injection-moulded coating (60) applied in the connection region of the two subassemblies (30, 40), and the cooperation of the first and second electrical connecting elements (34, 59) and of the first and second hydraulic connecting elements (28, 43) ensuring a reliable electrical and hydraulic connection of the two subassemblies (30, 40).
2. Fuel injection valve according to Claim 1, characterized in that the connection part (40) is essentially a plastic body which forms a fuel inlet nipple as a basic body (42) with a continuous flow bore (43), an electrical connection plug (56) being integrally formed on the basic body (42).
3. Fuel injection valve according to Claim 2, characterized in that the plastic selected for the injection-moulded coating (60) has its melting point at a higher temperature than the plastic used for the connection part (40).
4. Fuel injection valve according to Claim 2 or 3, characterized in that a labyrinth seal (61) with a plurality of grooves or furrows (62), which is covered by the injection-moulded coating (60), is formed on the outer circumference of the basic body (42).
5. Fuel injection valve according to one of the preceding claims, characterized in that the connection part (40) has provided on it at least one segment (77) which projects axially in the direction of the functional part (30) and which is left embedded in the injection-moulded coating (60) after the injection-coating operation.
6. Fuel injection valve according to Claim 5, characterized in that the at least one segment (77) is designed in the form of an arc of a circle.
7. Fuel injection valve according to one of the preceding claims, characterized in that the functional part (30) has a thin-walled valve sleeve (6), in the inner orifice (11) of which the valve-seat body (15), the valve needle (14) and a core (2) as an inner pole are introduced and which is surrounded by a magnet coil (1), the magnet coil (1) being enclosed at least partially by a valve casing (5) as an outer pole.
8. Fuel injection valve according to Claim 7, characterized in that the valve casing (5) has a plurality of grooves at its end (63) facing the connection part (40).
9. Fuel injection valve according to Claim 7 or 8, characterized in that the valve sleeve (6) of the functional part (30) is designed in such a way that, in the mounted state of the fuel injection valve, the said valve sleeve envelopes an end region (47), projecting into the orifice (11), of the connection part (40).
10. Fuel injection valve according to Claim 9, characterized in that a sealing ring (51) is arranged on the end region (47) of the connection part (40).
11. Fuel injection valve according to one of the preceding claims, characterized in that a fuel filter (44') is integrated in the functional part (30).
12. Fuel injection valve according to Claim 11, characterized in that the fuel filter (44') possesses a metal filter fabric as a screen netting.
13. Fuel injection valve according to one of the preceding claims, characterized in that the second electrical connecting elements (59) of the connection part (40) are of plug-like and/or socket-like design and the first electrical connecting elements (34) of the functional part (30) are of plug-like and/or socket-like design.
14. Fuel injection valve according to Claim 13, characterized in that the first electrical connecting elements (34) of the functional part (30) are of socket-like, eye-like, staple-like, cable-lug-shaped or profiled design.
15. Fuel injection valve according to one of the preceding claims, characterized in that the connection part (40) and/or the functional part (30) possess/possesses separately preassembled subassemblies.
16. Fuel injection valve according to Claim 2, characterized in that the electrical connection plug (56) can be connected to the basic body (42) in a connection region, electrical connecting elements for making a reliable electrical connection corresponding to one another.

Images