EP1817492A1

EP1817492A1 - Electrical bridging in fuel injectors

Info

Publication number: EP1817492A1
Application number: EP05801699A
Authority: EP
Inventors: Michael Fleig
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2004-11-24
Filing date: 2005-10-31
Publication date: 2007-08-15
Anticipated expiration: 2025-10-31
Also published as: EP1817492B1; US20080185461A1; ATE399934T1; WO2006056520A1; US8322629B2; DE502005004592D1; JP4571983B2; JP2008520888A; DE102004056667A1

Abstract

Disclosed is a fuel injector in which at least one electrically triggered valve is disposed inside an injector member and is connected to an externally accessible injector member contact by means of a solid conductor, the solid conductor and the electrical valve contact being interconnected directly via an electrically conducting positive connection or indirectly via an electrically conducting connecting element. The solid conductor is configured so as to substantially maintain the shape thereof under the influence of the proper weight thereof.

Description

Electrical bypass in fuel injectors

Technical area

In fuel injection systems for direct-injection internal combustion engines kom¬ men fuel injectors are used, which contain one or more electrically controllable valves. Thus, for example, an electrically controllable solenoid or piezoelectric valve can be provided to control a needle valve and thus to control the course of the injection. Other valves can be used for example for a pressure boosting. However, the electrical contacting of these valves is often a challenge.

State of the art

Since the or the electrically controllable valves are typically housed in the interior of an injector body, the electrical contacting of these electrically controllable valves causes considerable technical difficulties. In many cases, there is an electrical contact at the top of the injector body which can be connected to a corresponding control system and power supply system located outside of the injector body. In the interior of the injector body, this electrical contact must be connected to corresponding contacts of or the electrically controllable valves of the injection system. This connection usually takes place by means of flexible electrical cables and a simple soldering process.

However, this method for electrical contacting of the electrically controllable valves is associated with various disadvantages. Thus, the method is technically very complicated, since usually the cables must be soldered by hand to the corresponding electrical contacts. In practice, this process step requires a great deal of effort and time. Furthermore, the connection between the electrically controllable valves and the electrical contact on the injector body is difficult to solve again. For disassembly or disassembly of the injector body, typically the dissolved teten connections are unsoldered again. Such a complex process has the effect that maintenance of the injectors or replacement of individual parts of the injector body is in many cases unprofitable.

Presentation of the invention

The invention therefore proposes a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine, which avoids the described disadvantages of the prior art. The fuel injector has an injector body, at least one electrically controllable valve let into the injector body and at least one electrical injector body contact accessible from an outside of the injector body. At least one of the electrically controllable valves should have at least one electrical valve body contact. A basic idea of the present invention is to use a solid conductor for the electrical connection between the at least one valve contact and the at least one injector body contact, which does not deform under the action of its own weight force in contrast to a simple cable or wire and instead of a solder joint ¬ example, via plug contacts is contacted. Slight plastic deformations of the solid conductor under the action of its own weight and under additional force can be accepted if the shape of the solid conductor remains essentially unchanged. The at least one solid conductor thus represents a kind of artificial extension of the electrical valve contacts.

The at least one solid conductor and the at least one electrical valve contact are connected via an electrically conductive connection and / or via at least one electrically conductive connection element. In the latter case, the at least one connecting element is connected to the at least one solid conductor and the at least one electrical contact via a respective electrically conductive connection.

With the idea according to the invention fuel injectors can be realized in a simple manner, which can be disassembled or reassembled non-destructively into a plurality of individual parts. In this case, the injector body contact and the at least one electrically controllable valve can be arranged in different individual parts, wherein the at least one solid conductor is reversibly connected to at least one injector body contact. This connection can be made for example via a plug connection. The solid conductor is, for example, firmly or only slightly detachably connected at one end to a valve contact and at another end detachably connected to an injector body contact. In this case, the solid conductor can extend on the way from the valve contact to the injector body contact by further individual parts of the injector body, in particular by one or more Head of channels. The solid conductor can be electrically insulated against the injector body, for example by means of a shrink tube.

The fuel injector described allows a much simplified compared to the prior art manufacturing process. Initially, the described individual parts are produced and tested individually. Subsequently, the at least one valve contact with a solid conductor fixed or difficult to be releasably connected again. Subsequently, the items are connected to a single injector body, wherein the at least one solid conductor is reversibly connected to the at least one injector body contact.

drawing

The invention will be described in more detail below with reference to the exemplary embodiments illustrated in the figures. The same reference numerals designate the same or mutually corresponding in their function components.

In detail shows:

Figure 1 is a sectional view of a fuel injector with a solenoid valve for nozzle needle control and a solid conductor for electrically connecting the solenoid valve with an external injector body contact;

Figure 2 shows the solenoid valve with its two electrical valve contacts and fixed to the valve contacts solid conductors;

FIG. 3 shows an attachment of the solid conductors to the valve contacts by means of a welding process;

Figure 4 is a positive connection element;

Figure 5 shows an alternative positive connection element;

FIG. 6 is a sectional view of the connection of a valve contact with a solid conductor via a positive connection according to FIG. 4 and a plug connection;

FIG. 7 shows a sectional illustration of a connection of a valve contact with a master conductor via two form-fitting connections according to FIG. 4; FIG. 8 is a perspective view of two connections between a respective valve contact and a solid conductor via a respective positive connection according to FIG. 4 and a positive connection according to FIG. 5; and

9 shows a flowchart of a method according to the invention.

variants

FIG. 1 shows an overall view of an injector body 110 for a common rail injection system. The injector body 110 can be dismantled at parting lines 124, 126, 128 and 130 into substantially five functional modules 132, 134, 136, 138, 140: a control module 132, a sealing plate 134, a line connection module 136, a pressure booster module 138 and a Nozzle module 140. The pressure booster module 138 serves essentially to provide a fuel pressure, which is provided by an external pressure source, for example via a high-pressure accumulation space (common rail), to the fuel injector (for example 1000 bar) into a second pressure ( 2200 bar, for example), so that two working pressures are available for the injection process.

Furthermore, the injector body 110 has two solenoid valves 111, 112: a first solenoid valve 111 arranged in the control module 132 for controlling the pressure transmission in the pressure booster module 138, and a second solenoid valve 112 arranged in the nozzle module 140 for controlling the actual injection process via a (FIG. not shown) valve needle.

Of considerable practical importance is the separation between the control module 132 of remaining injector body 110 along the first separation line 124. This separability causes the ("dry") control module 132 and the ("wet") part of the injector body below the first separation line 124 110 can be designed, manufactured and tested separately to be assembled afterwards. In addition, due to this separability for maintenance purposes, for example, it is easy to exchange individual components of the injector body 110, which corresponds to the "system repair idea" (SIS).

The solenoid valve 112 in the nozzle module 140 is electrically actuated via two electrical valve contacts 114. The injector body 110 has at its upper end an electrical injector body contact 116 accessible from above. The realization of a dismantling In the illustrated modular construction of the injector body 110, the injector body 110 or a simple modular assembly consists of electrically connecting the valve contacts 114 to the injector body contact 116 in such a way that further ease of assembly and disassembly of the injector body is ensured.

To connect the two electrical valve contacts 114 to the injector body contact 116, two conductor channels 120 are provided in this embodiment, which extend through the modules 138, 136 and 134. The conductor channels 120 are formed by bores in the pressure booster module 138, in the line connection module 136 and in the sealing plate 134. When the injector body 110 is assembled, these bores are in each case flush at the parting lines 128 and 126, so that a single, continuous conductor channel 120 results.

The individual holes of the conductor channel 120 have in this embodiment in the individual modules 138, 136, 134 each have a straight course. A curved course of the holes can be realized with the inventive solution. However, the bores in the individual modules 138, 136, 134 each have a different inclination to an injector axis 142. While the conductor channel 120 in the pressure booster module 138 has an inclination of 1 ° to the injector axis 142, the inclination in this embodiment in the line connection module 136 is 2.2 °. These different angles of inclination relative to the injector axis 142 are due to the fact that the injector body 110 tapers in its downward direction, ie, from the control module 132 to the nozzle module 140, in its cross section.

The contact between the valve contacts 114 and the injector body contact 116 must therefore fulfill several boundary conditions:

The connection between the valve contacts 114 and the injector body contact 116 should be reliable and resistant to impact during operation, but should simply be releasable again for assembly purposes. • The connection must be able to easily follow an overall not straight course of a conductor channel 120, ie have a corresponding flexibility or plasticity.

This problem is inventively achieved in the illustrated embodiment in that the connection between the two electrical valve contacts 114 of the Magnetven¬ tils 112 and the Injektorkörperkontakt 116 partially via two solid conductors 118 takes place. The solid conductors 118 extend through the two conductor channels 120 and connect the valve contacts 114 with electrical plug contacts 122, which in turn via an elekt¬ rische connection 144 (for example, two each at one end with an electric Plug contact 122 and at the other end with the Injektorköφerkontakt verlöten¬ th cables) are connected to the injector body contact 116. The solid conductors 118 are fixed or detachably connected electrically to the valve contacts 114 (see below).

The connection of the solid conductors 118 with the plug contacts 122 is reversible, so that this connection can be made during assembly of the injector body 110 by simply pressing in the solid conductors 118 into the plug contacts 122. On the other hand, during maintenance, the solid conductors 118 can be easily removed again from the plug contacts 122 and thus be disassembled again with the injector body 110 without the need for unsoldering of electrical connections.

The solid conductors 118 are stiff enough that on the one hand they do not substantially change their shape under their own weight and thus easily pass through the conductor channels 120 with their different inclinations to the injector axis 142 and insert into the plug contacts 122. The solid conductors should have a certain plasticity, so that no mechanical stresses occur at the transition between sections of the conductor channels 120 with different angles of inclination. The term "solid conductor" does not necessarily restrict the selection of materials to solid materials, but it is also possible, for example, to use waveguides (tubes) as solid conductors 118, provided they have sufficient mechanical rigidity.

In the exemplary embodiment illustrated in FIG. 1, the solid conductors 118 comprise CuSn6 having a Brinell hardness between 80 and 90 HB as the material which is otherwise used, for example, as a welding filler. Alternatively, however, it is also possible, for example, to use CuA18, CuA18Ni2, CuA18Ni6, CuA19Fe, CuMnI 3A17, CuSi3, CuSn, copper or nickel silver. These materials meet the above requirements for hardness and plasticity and are also easily connected by welding with the valve contacts 114. The hardness of the materials should be between 50 and 100 HB, preferably between 60 and 95 HB and particularly advantageously between 75 and 90 HB.

In Figure 2, the solenoid valve 112 is shown and two solid conductors 118, each 127 mm in length, which are connected to the valve contacts 114. The connection between the solid conductors 118 and the valve contacts 114 is in this case encapsulated with an electrically insulating thermoplastic 210 and therefore not visible in this perspective representation. PPS or PA, in particular glass fiber-filled PPS or PA (eg PPS GF 30 or PA 66 GF 30), may be used as the thermoplastic material in addition to other alternatives, in which case the glassiaser filling additionally increases the mechanical stability of the compound strengthened. The electrically insulating thermoplastic plastic 210 increases the dimensional stability of the connections between the valve contacts 114 and the solid conductors 118. This additionally ensures that the Massive conductor 118 maintain substantially their orientation, which facilitates insertion of the solid conductors 118 through the conductor channels 120 of the individual modules 138, 136, 134 and a subsequent insertion into the plug-in contact 122 during assembly of the injector 110. Furthermore, the thermoplastic material 210 of the connection points electrically isolated from each other, so that no short circuits between the valve contacts 114 may occur. Compared to conventional wire connections or Kabelver¬ connections so the installation of the injector body 110 is greatly simplified.

Furthermore, the solid conductors 118 in this exemplary embodiment are largely wrapped with heat-shrinkable tubing 212. The shrink tubes 212 electrically insulate the solid conductors 118 against the walls of the conductor channels 120 of the injector body 110. The shrink tubes 212 are not completely shrunk onto the solid conductors 118 in order to save costs, but only in some sections. The shrink tubing 212 extends upwardly from the electrically insulating thermoplastic 210. As an alternative to a heat-shrinkable tube 212, it is also possible, for example, to use rigid or elastic, electrically-insulating plastic sleeves as electrical insulation of the semiconductor conductor 118. However, the electrical insulation, in particular the heat-shrinkable tube 212, terminates in each case below the upper ends 214 of the solid conductors 118, so that the upper ends 214 of the solid conductors 218 are not enveloped in an electrically insulating manner and can be plugged into the plug contacts 122 in an electrically connecting manner. In this way, by simply plugging together the segments of the injector body 110, an electrically conductive connection between the valve contacts 114 and the injector body contact 116 can be produced without an expensive soldering or welding process. On the other hand, the injector body 110 can again be easily dismantled for maintenance purposes, wherein the plug connection 122 is simply separated again from the solid conductors 118 by the action of force. Unsoldering or otherwise separating the compound is not required, since the compound is reversible.

FIG. 3 illustrates perspectively an exemplary embodiment of the connections between the valve contacts 114 of the solenoid valve 112 and the solid conductors 118, in which the valve contacts 114 and the solid conductors 118 are connected directly by welded connections 310. For this purpose, the upper ends of the valve contacts 114 are bent at right angles, as are the lower ends of the solid conductors 118. The bent ends are made overlapping and welded in each case (cohesive connection). Alternatively, non-positive or positive connections can also be used. This welded connection 310 allows a cost-effective connection between the solid conductors 118 and the valve contacts 114, since no additional connecting elements are required. However, in this embodiment, in the production of the First, a bending of the ends and then a welding erforder¬ Lich.

Not shown in FIG. 3 is the thermoplastic, electrically insulating plastic encapsulation 210 (see FIG. 2), which can also be applied in the exemplary embodiment according to FIG. 3 in order to electrically insulate the connection sites and mechanically stabilize the connection 310.

The exemplary embodiment according to FIG. 3 is an example of a direct connection of the valve contacts 114 to the solid conductors 118. Alternatively, the valve contacts 114 with the solid conductors 118 can also be connected via electrically conductive connecting elements 410. Examples of such electrically conductive connecting elements 410 are shown in FIGS. 4 to 8. In this case, in each case one end of an electrically conductive connection element 410 is fixedly or detachably connected to a valve contact 114 and another end of the electrically conductive connection element 410 is connected to one end of a solid conductor 118. This connection can in turn be positive, non-positive or material be made conclusive, but care must be taken that the solid conductor 118 is not able to change its Aus¬ direction relative to the valve contact 114 substantially. This has already been described above with reference to FIG. 2, and contributes to the fact that the individual modules 132, 134, 136, 138, 140 of the injector body 110 are easier to assemble together.

FIG. 4 illustrates a possible embodiment of a connection between an electrically conductive connecting element 410 and either one end of a valve contact 114 or one end of a solid conductor 118, wherein the electrically conductive connection takes place by means of a positive connection method. For this purpose, the electrically conductive connecting element 410 has a bore 412 at one end. The bore 412 has a diameter of 2.5 mm. In the bore 412 extend, symmetrically along the circumference of the bore 412 distributed, plastically deformable electrically conductive tongues 414. The tongues 414 extend so far into the bore 412, that in this Aus¬ management example, a light interior with a diameter of 0.9 mm remains. The tongues 414 are plastically deformable so that one end of a solid conductor 118 or a valve contact 114 can be inserted into the bore 412. During the deformation, the tongues 414 form barbs, so that the solid conductor 118 or the valve contact 114 once inserted into the bore 412 has been, can be removed again only under greatly increased effort again from this. In addition, the tongues 414 provide an electrically conductive connection between the sivleiter 118 or the valve contact 114 and the electrically conductive Verbindungsele¬ element 410 ago.

FIG. 5 shows an embodiment of a connection between a connecting element 410 and a solid conductor 118 or a valve contact 114 that is an alternative to FIG. 4. In this exemplary embodiment, it is a ram contact, in which one end of the solid conductor 118 and the valve contact 114 can be introduced into a groove 510 at one end of the electrically conductive connection 410 under pressure. The groove has a region 512 with plastically deformable serrations and a widened insertion region 514 with bevelled edges. If one end of the solid conductor 118 or of the valve contact 114 is inserted or driven into the groove 510 under an increased force, the teeth deform plastically in region 512. In this case, a positive connection is made to the end of the solid conductor 118 and the valve contact 114, which is electrically conductive and mechanically stable so that the solid-state 118 and the valve contact 114 only with increased effort again removed from the groove 510 is.

In FIGS. 6 and 7, possible embodiments of the connection between a valve contact 114 and a solid conductor 118 are shown by way of example. The exemplary embodiments show that the possible connections between solid conductor 118 or valve contact 114 and the electrically conductive connection element 410 can be combined as desired. Thus, in FIG. 6, one end of a valve contact 114 is connected in an electrically conductive manner to the electrically conductive connecting element 410 by means of a non-positive connection 610 according to the exemplary embodiment illustrated in FIG. Furthermore, at the other end, one end of the solid conductor 118 is conductively connected to the connection element 410 via an electrically conductive plug connection 612. This plug-in connection 612 can be released again by the application of force, but the stability of the connection 612 between the solid conductor 118 and the valve contact 114 is ensured to such an extent that the solid conductor 118 can not fall out of the plug connection 612 again due to its own weight.

Furthermore, in this exemplary embodiment, the entire connection between the valve contact 114 and the mass divider 118 is enveloped by an electrically insulating plastic 210. This enclosure, which has already been described above, can be done in particular by an injection molding process.

FIG. 7 shows a preferred embodiment which is alternative to FIG. 6, in which both the connection of the valve contact 114 to the electrically conductive connecting element 410 and the connection of one end of a solid conductor 118 to the connection element 410 form-fitting connections according to Figure 4 are used. Also in this embodiment, the entire connection is encapsulated by an electrically insulating thermoplastic 210. In contrast to the connection 612 in the exemplary embodiment according to FIG. 6, however, after encapsulation no destructive separation of the solid conductor 118 from the electrically conductive connection element 410 is possible. However, the remaining function of the embodiment according to FIG. 7 is identical to the function of the embodiment according to FIG. 6.

FIG. 8 is a perspective view of another possible embodiment of the connection between the valve contacts 114 and the solid conductors 118. In this embodiment, the connecting elements 410 each have at one end a positive connection 610 according to the exemplary embodiment illustrated in FIG. At the respective other end, the connecting elements 410 have a ram contact 810 according to the exemplary embodiment illustrated in FIG. 5, via which the connecting elements 410 can be connected to the ends of the solid conductors 118. In turn, in this exemplary embodiment, the entire connection is encapsulated by an electrically insulating thermoplastic 210, but in this exemplary embodiment all contacts are combined by a single encapsulation 210. The remaining mode of operation of the exemplary embodiment according to FIG. 8 is identical to the exemplary embodiments according to FIGS. 6 and 7.

FIG. 9 shows a method according to the invention for producing a fuel injector. In this method, solid conductors 118 and connections according to the embodiments shown above or similar compounds of the invention are used. The illustrated method steps do not necessarily have to be performed in the order presented. Various method steps can also be carried out simultaneously, and additional method steps not shown in FIG. 9 can be carried out.

In a first method step 910, a first module of a fuel injector, for example a control module 132, is produced. This first module has at least one externally accessible injector body contact 116. The injector body contact 116 is electrically conductively connected to an electrical plug contact 122.

In a second method step 912, a second module, for example a nozzle module 140, is produced, which has at least one electrically controllable valve 112. Furthermore, the electrically controllable valve 112 has electrical valve contacts 114. In a third method step 914, the at least one electrical valve contact 114 is connected to at least one solid conductor 118. The solid conductor 118 should have the properties described above. The connection between the solid conductor 118 and the valve contact 114 takes place in each case directly or via an electrically conductive connection element 410 as described above via one of the connections 310, 610, 612, 810 according to the invention.

In a fourth method step 916, the two modules 132, 140 are then connected directly or indirectly to a single injector body. In this case, additional modules 134, 136, 138 can be introduced (see above), with the solid conductors 118 being guided, in particular, through conductor channels 120. The at least one solid conductor 118 is reversibly connected directly or indirectly (eg via plug contacts 122 and an additional electrical connection 144) to the at least one injector body contact 116.

The method described for producing the fuel injectors represents a considerable improvement over conventional methods in which electrical cables are used for connection between the valve contacts 114 and the injector body contacts 116. Elaborate soldering processes and tedious passage of the cables through the individual segments of the injector body 110 omitted.

LIST OF REFERENCE NUMBERS

110 Inj ector body

111 Solenoid valve in the control module 112 Solenoid valve in the nozzle module

114 valve contact

116 injector body contact

118 solid conductors

120 conductor channel 122 plug contacts

124 first dividing line

126 second dividing line

128 third dividing line

130 fourth dividing line 132 control module

134 sealing plate

136 line connection module

138 pressure translator module

140 Nozzle module 142 injector axis

144 electrical connection

210 electrically insulating thermoplastic

212 shrink tubing

214 upper end of the solid conductors 310 welded joint

410 electrically conductive connecting element

412 hole

414 plastically deformable electrically conductive tongue

510 Groove 512 Area with plastically deformable serrations

514 insertion area with bevelled edges

610 positive connection according to FIG. 4

612 electrically conductive connector

810 positive Rammkontaktierung according to Figure 5 910 production of the first item with injector body contact

912 Production of a second item with valve

914 Connection of the valve contacts with the solid conductor

916 Assembly of the individual parts

Claims

claims

1. A fuel injector for injecting fuel into a combustion chamber of a

Internal combustion engine, wherein the fuel injector comprises: a) an injector body (110); b) at least one electrically controllable valve (111, 112) let into the injector body (110), at least one electrically controllable valve (112) having at least one electrical valve contact (114); and c) at least one electrical injector body contact (116) accessible from an outside of the injector body (110), characterized

- That the at least one electrical valve contact (114) and the at least one electrical Injektorkörperkontakt (116) are at least partially connected via at least one under its own weight substantially dimensionally stable electrical solid conductor (118), wherein the at least one solid conductor

(118) extends through at least one conductor channel (120); and

- That the at least one solid conductor (118) and the at least one electrical valve contact (114) via an electrically conductive connection (310) and / or at least one electrically conductive connecting element (410) are connected, wherein the at least one electrically conductive connecting element (410 ) is connected to the at least one solid conductor (118) and the at least one electrical Ven¬ tilkontakt (114) via in each case an electrically conductive connection (610, 612, 810).

2. Fuel injector according to the preceding claim, characterized in that the fuel injector is non-destructively dismantled or assembled from at least two modules (132, 134, 136, 138, 140),

- wherein at least one injector body contact (116) is arranged on or in a first module (132), - wherein at least one electrically activatable valve (112) in a second module (140) different from the first module (132) is arranged, and

- Wherein the at least one solid conductor (118) with the at least one Injektor¬ body contact (116) is directly or indirectly reversible and electrically conductive verbun¬ the.

3. Fuel injector according to the preceding claim, characterized by at least one third module (134, 136, 138),

- wherein the third module (134, 136, 138) is arranged between the first and the second module (132, 140), - wherein the third module (134, 136, 138) at least one conductor channel (120) auf¬ has, and

- Wherein the at least one solid conductor (118) extends through the at least one conductor channel (120).

4. Fuel injector according to one of the three preceding claims, characterized gekenn¬ characterized in that the at least one electrically controllable valve (111, 112) has a Mag¬ netventil.

5. Fuel injector according to one of the two preceding claims, characterized ge indicates that the second module is a nozzle module (140) with an electrically an¬ controllable nozzle valve (112).

6. Fuel injector according to one of the preceding claims, characterized in that the at least one solid conductor (118) by at least one electrically insulating sheath (212), preferably a completely or partially shrunk onto the at least one solid conductor (118) shrink tubing ( 212) against which at least one conductor channel (120) is electrically insulated.

7. Fuel injector according to one of the preceding claims, characterized gekenn¬ characterized

- That the at least one solid conductor (118) and the at least one electrical valve contact (114) via at least one connecting element (410) are connected; - That the at least one connecting element (410) has at least one deformation contact area (414, 512); and

- That one end of the at least one solid conductor (118) and / or an end of the at least one valve contact (114) in the deformation-contact region (414, 512) can be inserted, wherein the deformation-contact region (414, 512) or the whole partially plastically deformed, wherein a removal of the end of the at least one solid conductor (118) or the at least one Ventilkontak¬ tes (114) tes (114) and an electrically conductive connection (610, 612) between the at least one solid conductor (118) or At least one Ven¬ tilkontakt (114) and the at least one connecting element (410) is produced.

8. Fuel injector according to one of the preceding claims, characterized gekenn¬ characterized in that at least one connection (610, 612; 810) between the at least one solid conductor (118) and the at least one connecting element (410) and / or at least one connection (610, 612; 810) between the at least one valve contact (114) and the at least one connecting element (410) and / or at least one connection (310) between the solid conductor (118) and the at least one Valve contact (114) and / or the at least one connecting element (410) wholly or partially with an electrically insulating plastic

(210) is sheathed.

9. Fuel injector according to the preceding claim, characterized in that the electrically insulating plastic (210) comprises an injection-moldable plastic.

10. Fuel injector according to one of the preceding claims, characterized gekenn¬ characterized in that the at least one solid conductor (118) has at least one of the materials CuA18, CuA18Ni2, CuA18Ni6, CuA19Fe, CuMnI 3A17, CuSi3, CuSn, copper or nickel silver.

11. Fuel injector according to one of the preceding claims, characterized gekenn¬ characterized in that the at least one solid conductor (118) has at least one material having a Brinell hardness between 50 and 100 HB.

12. A method of manufacturing a fuel injector comprising the steps of: a) preparing a first module (132) of the fuel injector, the first module (132) having at least one injector body contact (116); b) a second module (140) is produced, wherein the second module (140) at least one electrically controllable valve (112) with at least one electrical

Valve contact (114); c) the at least one electrical valve contact (114) is connected to at least one electrical mass conductor (118) which is substantially dimensionally stable under its own weight via an electrically conductive connection (310) and / or via at least one electrically conductive connection element (11). 410), wherein the at least one connecting element (410) is connected to the at least one solid conductor (118) and the at least one electrical valve contact (114) via in each case an electrically conductive connection (610, 612; 810); and d) the two modules (132, 140) are connected directly or indirectly to an injector body (110), wherein the at least one solid conductor (118) connects reversibly directly or indirectly to the at least one injector body contact (116) becomes.