DE102021203601A1 - Connection device for a dosing module - Google Patents

Abstract

The invention relates to a connection device (12) for a dosing module (2) of an exhaust gas aftertreatment system (1) for a motor vehicle, with a cover (7) having a through opening (14) for tight attachment to an opening (8) of the dosing module (2), with at least one cable (5) which has at least one electrical line (6) and extends through the through-opening (14), and with an elastically deformable sealing element (17) which is placed between the cover (7) and the at least one cable ( 5) and/or the electrical conductor (6) in order to seal the through-opening (14) tightly. It is provided that the sealing element (17) has at least one passage (22) for the at least one cable (5) and/or the at least one conductor (6), at one end - viewed in the direction of extension of the passage (22) - on the cover (7) and the other end is arranged on a holding bush (29), into which the cable (5) and/or the electrical conductor (6) is guided through a recess (35) in a base (31) of the holding bush (29). , and wherein a holding element (36) is fastened to the cable (5) and/or the conductor (6), which protrudes laterally from the cable (5) or the conductor (6) in such a way that it can be attached to the floor (31) of the retaining bush (29) in the longitudinal extension of the cable (5) or conductor (6).

Description

The invention relates to a connection device for a dosing module of an exhaust aftertreatment system for a motor vehicle, with a cover having a through-opening for tight attachment to an opening of the dosing module, with at least one cable having at least one electrical line, which extends through the through-opening, and with a elastically deformable sealing element which acts between the cover and the at least one cable in order to seal the through-opening tightly.

State of the art

Connection devices of the type mentioned are already known from the prior art. In exhaust gas aftertreatment systems, dosing modules are used to inject or inject a predetermined amount of a liquid exhaust gas aftertreatment agent into an exhaust gas stream of an internal combustion engine. To actuate the dosing module, it must be electrically contacted. Cables are provided for this purpose, which are electrically connected to the dosing module on the one hand and electrically to, for example, a control unit of the motor vehicle or the exhaust gas aftertreatment system on the other hand. In order to facilitate assembly, it is known to provide a connection device which, in particular, enables a plug-in connection to the dosing module for the electrical connection. The cable is thus attached at one end to the connection device, which means that only the connection device has to be connected to the dosing module during assembly. A soldering or screwing process can thus be dispensed with, as a result of which assembly in the motor vehicle itself is particularly simple.

In order to ensure that the electrical connection does not corrode or is adversely affected by other external influences, it must be designed to be sealed in order to prevent liquid from penetrating into areas in which electrically conductive elements of the connecting device are open. To date, the cable has been passed through a through-opening in the cover, in which an elastically deformable O-ring is also arranged as a sealing element. The O-ring thus acts between the cable and the inside of the cover at the passage opening. A suitable cable is a cable that has a plurality of strands or electrical conductors that are surrounded by a common overmolding or a common jacket, which then interacts with the O-ring in a sealing manner.

Disclosure of Invention

The connection device according to the invention with the features of claim 1 has the advantage that simple and reliable installation and high operational reliability are ensured. The connecting device according to the invention is characterized in that the sealing element has at least one through-channel for the at least one cable and/or the at least one conductor, and at one end—seen in the direction of extension of the through-channel—is assigned to the cover and at the other end to a retaining bush into which the cable and/or the electrical conductor is guided through a recess in a base of the retaining bush, and wherein a retaining element is fastened to the cable and/or the conductor, which protrudes laterally from the cable in such a way that there is a retaining stop, interacting with the base, for the cables. The holding element itself cannot therefore be guided through the recess in the base of the holding bush. Due to the fact that the holding element is fastened to the cable or to the conductor, the holding element reliably prevents the cable or the conductor from being pulled out of the holding socket. This provides tension protection for the free ends of the cable, which can be connected, for example, to a contact plug or the like on the other side of the retaining socket. For example, if the cable or the conductor is subjected to a high tensile force, the retaining element ensures that the cable cannot be pulled out of the connection device and that the tensile forces do not affect the connection area beyond the retaining socket. This ensures advantageous strain relief, which offers a high level of operational reliability for the connection device. In addition, the restraining device can be implemented and assembled easily and inexpensively with the aid of the restraining stop. The design as a molded seal also ensures that the course of the through-channel can be predetermined and is permanent.

The holding element is preferably clamped or crimped to the cable. This ensures easy assembly of the holding element on the cable or the conductor. In particular, this provides a permanently resilient connection between the retaining element and the cable.

The holding element preferably encloses the cable and/or the conductor completely or almost completely on the peripheral side. This ensures that a The cable is prevented from being pulled out of the retaining socket or out of the connection device.

Furthermore, it is preferably provided that an inside diameter of the recess in the base of the retaining bush corresponds to the outside diameter of the cable and/or the conductor or is only slightly larger. The result of this is that the holding element only has to protrude a little radially from the cable or the conductor in order to form the advantageous retaining function or the advantageous retaining stop explained above. In particular, in this case the recess is of circular design with a closed peripheral edge.

A positive anti-rotation lock is particularly preferably formed between the sealing element and the cover. The anti-rotation device is preferably formed by the sealing element on the cover itself. The positive anti-rotation lock reliably prevents the sealing element from rotating within the cover, in particular around an axis or an axis formed by the cable, for example. As a result, moments that act on the connection device in the circumferential direction are also reliably introduced into the cover and overloading of the connection device, in particular at the electrical contact points, is reliably prevented.

According to a preferred development of the invention, the sealing element has an outer contour adapted to the through-opening for planar contact with the cover in the through-opening. A particularly good sealing effect of the sealing element on the cover is achieved by the flat contact.

According to a further preferred embodiment of the invention, at least one narrowing of the cross section is formed in the through-channel to produce a positive and/or non-positive tension lock for the cable and/or for the conductor. According to the invention, the sealing element is now adapted in terms of its shape to the shape of the through opening of the cover, so that a flat contact is ensured, which in particular ensures a high degree of tightness between the sealing element and the cover. In addition, the shape adaptation offers the possibility of ensuring a rotation lock between the cover and the sealing element in a simple manner, as well as a positive alignment and arrangement of the sealing element in the cover. In connection with the present invention, a cable is understood to mean an electrically insulating overmold or an electrically insulating sheath through which one or more electrically conductive conductors are routed. An electrical conductor is understood to mean the electrically conductive component of the cable, for example in the form of a strand or a wire. The narrowing of the cross section in the through-channel through which the cable or conductor is routed also means that the cable or conductor is held locally within the through-channel with an increased prestressing force or by deformation. The through-channel has at least essentially a cross-section that corresponds to the outer cross-section of the cable, so that the cable can be pushed through the through-channel for assembly. The narrowing of the cross-section locally reduces the cross-section of the through-channel and makes it more difficult for the cable to be pulled through, but without completely preventing it. In this way, the cable can penetrate the narrowing of the cross section, in particular with elastic deformation of the cable and/or the sealing element. This ensures a seal between the cable or the conductor and the sealing element, which ensures that liquid or moisture cannot get into the connection device along the course of the cable or conductor.

According to a preferred development of the invention, the narrowing of the cross section is formed by at least one radial projection protruding into the through-channel. Advantageously, the narrowing of the cross section is arranged precisely and its effect can be adjusted by the radial projection. The further the radial projection protrudes from the inner wall or side of the through-channel into the through-channel, the stronger the effect of the narrowing of the cross-section on the cable, and the stronger the effect of the tension protection produced thereby. In particular, the radial projection is designed in such a way that it has one or more curves that emanate from the inside of the through-channel of the sealing element, so that there are no steps or cracks in the through-channel that could damage the cable as it is guided through the through-channel or prevent it from being pulled through could become.

The at least one radial projection preferably extends over the entire circumference of the through-channel as an annular projection. This results in a symmetrical narrowing of the cross section in the through-channel and a centering of the cable in the through-channel. This optimizes the sealing effect between the sealing element and the cable or the conductor.

Provision is furthermore preferably made for at least two radial projections to be arranged in the through-channel and spaced apart from one another in the longitudinal extension of the through-channel. This improves the train control, because the cable is now through two cross sectional tapers in the through-channel subjected to a holding force and is thereby held in the through-channel in a form-fitting and/or non-positive manner.

Furthermore, it is preferably provided that the sealing element has at least one further passage channel with at least one narrowing of the cross section.

As a result, two cables can be routed independently of one another through the sealing element and locked and held in each case by a tension lock on the sealing element. The passage channels can have the same or different diameters.

The through-channels of the sealing element are particularly preferably of the same design, ie apart from having the same diameters or cross-sections, they also have the same number and arrangement of cross-sectional tapers or radial projections. As a result, two identical cables can advantageously be arranged and fastened in a sealing manner on the sealing element. This has particular advantages when integrating the connection device into the exhaust gas aftertreatment system already mentioned, in which cables with electrical conductors for electrical contacting of the dosing module are then routed through the sealing element in particular.

Furthermore, it is preferably provided that the passage channels extend parallel to one another through the sealing element, at least in sections. This ensures easy assembly of the cable on the sealing element.

The through-channels particularly preferably each extend straight through the sealing element, ie they do not have any bends or curves in their course, so that automated assembly of the cables on the sealing element is ensured in a simple manner. The train protection is nevertheless reliably guaranteed by the radial projection or projections.

Furthermore, it is preferably provided that the respective radial projection is formed in one piece with the sealing element. This ensures simple and cost-effective production of the sealing element and reliable arrangement and load-bearing capacity of the respective radial projection.

A contact plug is particularly preferably fastened in the cover and the respective cable is electrically connected to the contact plug. The tension lock ensures that tensile forces exerted on the cable do not affect the contact plug and thus the electrical connection of the cable to the contact plug is permanently guaranteed.

• 1 eine vereinfachte Darstellung eines Abgasnachbehandlungssystems eines Kraftfahrzeugs mit einer vorteilhaften Anschlussvorrichtung,
• 2 die Anschlussvorrichtung aus 1 in einer vergrößerten Längsschnittdarstellung,
• 3 ein Dichtelement der Anschlussvorrichtung aus 2 in einer vergrößerten Darstellung,
• 4 eine perspektivische Draufsicht auf die Anschlussvorrichtung, und
• 5 eine Detailschnittdarstellung der Anschlussvorrichtung.

In the following, the invention will be explained in more detail with reference to the drawings. to show

• 1 a simplified representation of an exhaust aftertreatment system of a motor vehicle with an advantageous connection device,
• 2 the connection device 1 in an enlarged longitudinal section,
• 3 a sealing element of the connection device 2 in an enlarged view,
• 4 a perspective top view of the connection device, and
• 5 a detailed sectional view of the connection device.

1 shows a simplified sectional view of an advantageous exhaust gas aftertreatment system 1 for a motor vehicle not shown here. The exhaust gas aftertreatment system 1 has a dosing module 2 which is designed to inject a predetermined amount of exhaust gas aftertreatment agent into the exhaust gas flow of an internal combustion engine of a motor vehicle. For this purpose, the dosing module 2 has, in particular, an electrically operable actuator, for example a magnetic actuator, by means of which a valve element can be displaced to open and close an injection opening. In order to make electrical contact with the actuator, the dosing module 2 according to the present exemplary embodiment has connection contacts 3, which are designed in particular as contact plug receptacles.

Because the dosing module 2 is arranged in an exhaust system, the connection contacts 3 are used for a simple plug connection of the dosing module 2 to a cable harness 4 of the motor vehicle, which leads, for example, to a control unit of the internal combustion engine, the exhaust gas aftertreatment system or the motor vehicle, which is not shown in detail here. The cable harness 4 has at least one cable 5 which has a corresponding number of electrical conductors 6 corresponding to the number of connection contacts 3 . A cover 7 is fastened to one end of the cable 5 arranged in the dosing module 2 and can be inserted and fastened in a sealing manner into a receiving or passage opening 8 of the dosing module 2, in particular a housing 9 of the dosing module 2, as for example in 1 shown. The cable 5 is guided through the cover 7 and connected to a contact plug 10 on the side of the cover 7 facing away from the cable 5 . In this case, each of the electrical lines 6 is present with a plug connector clock 11 of the contact plug 10 electrically connected permanently. The plug contacts 11 are designed to interact with the connection contacts 3 of the dosing module 2 . According to the present exemplary embodiment, the contact plug 10 is designed such that when the cover 7 is mounted on the housing 9, the plug contacts 11 are pushed into the contact plug receptacles of the contact terminals 3 and are thereby electrically connected to them. In this case, in addition to a simple touch contact, there is preferably also a press fit between the respective plug contact 11 and the respective connection contact 3 in order to ensure a permanently secure electrical connection. As an alternative or in addition, the plug contacts 11 are each connected to the connection contacts 3 with a material fit, in particular by means of resistance welding.

The contact plug 10 has a retaining socket 29, which also forms a pull-out protection 30 for the cables 5, as in particular with reference to FIG 5 to be explained in more detail below.

The cover 7, together with the cable 5 and the contact plug 10, thus forms an advantageous connection device 12 for making electrical contact with the dosing module.

2 shows the connecting device 12 in an enlarged longitudinal section. The cable 5 has an advantageous electrically insulating jacket 13, which is made of rubber and/or as an overmolding, for example. The two electrical conductors 6 are guided in the jacket 13 . The conductors 6 are arranged at a distance from one another in the jacket 13, the distance between the conductors 6 being filled by the material of the jacket 13, so that they are permanently at a safe distance from one another and thus cannot lead to an electrical short circuit. Alternatively, the electrical conductors 6 each additionally have their own insulation, for example in the form of their own (conductor) jacket.

The cover 7 has a passage opening 14 in the middle, through which the cable 5 extends to the connector plug 10 . Preferably, the jacket 13 ends before penetrating the cover 7, so that the conductors 6, freed from the jacket, extend through the cover 7.

In this case, the connecting device 12 optionally has a sealing shoe 15 which extends over the cable 5 and in sections over the sheath 13 of the cable 5 and ends on the cover 7 in an area in which the conductors 6 are free of the sheath 13 . The sealing shoe 15 thereby advantageously seals the cable 5 in the area where the conductors 6 are separated from the environment. Optionally, the sealing shoe 15 is held clamped by one or more clamps 16 in a form-fitting manner on the cover 7, in particular viewed in the longitudinal extension of the cable 5, in order to ensure a permanent sealing effect. Alternatively or additionally, a crimping element, in particular a hexagonal crimp, is present in the area of the sealing shoe 15 or as an alternative to the sealing shoe 15, which presses radially onto the casing 13 in order to relieve tension. This relieving of tensile forces ensures that tensile forces that act on the cable 5 in the direction of the arrow 16, at least initially only affect the cover 7 and not the individual cables 5 or conductors 6 within the connection device 12.

A sealing element 17 is also arranged in the through-opening 14 of the cover 7 , the sealing element is designed as an elastically deformable molded part, in particular made of an elastomer material, and is pressed into the through-opening 14 of the cover 7 . For this purpose, the sealing element 17 has an outer diameter or a cross section in the relaxed state that is larger than the inner diameter or cross section of the through-opening 14.

3 shows the sealing element 17 in an enlarged longitudinal sectional view in the relaxed state. The outer contour of the sealing element or the cross section of the sealing element 17 is adapted to the inner contour of the through-opening 14 in such a way that the sealing element 17 lies flat against the inside of the through-opening 14 in the inserted state. According to the present exemplary embodiment, the sealing element 17 has a first section 18 and a second section 19 when viewed in the longitudinal direction, with section 18 having a smaller external cross section than section 19.

The sealing element 17 is inserted with the section 18 foremost into the through opening 14 of the cover 7, so that a simple centering and insertion of the sealing element 17 is ensured. The through opening 14 optionally also has a section 20 whose cross section is smaller than an adjoining section 21, as in 2 shown. Alternatively, sections 20 and 21 have the same cross section or inside diameter. This ensures that the sealing element 17 can be easily pushed into the cover 7 and a sufficient sealing effect is ensured in particular by the section 19 of the sealing element 17 and the section 21 of the cover 7 . Section 21 is the section of cover 7 or through-opening 14 that faces cable 5, so that Sealing element 17 is first introduced with section 18 into section 21 of cover 7 and is braced or pressed in cross section by further insertion into through-opening 14 both in section 18 and in section 19 through sections 20 and 21 of cover 7 of through-opening 14 . This ensures that the sealing element 17 rests in a reliable, sealing manner over the entire area on the cover 7 in the through-opening 14 . In addition, this results in static friction or an adhesive connection, by means of which the sealing element 17 is advantageously fastened or held in the cover 7 . In addition, the sealing element 17 as a whole is prevented from being pushed completely through the through-opening 14 due to the different cross sections and/or due to the static friction. In the opposite direction, the sealing element 17 cannot escape from the passage opening 14 in the mounted state, in particular through the sealing shoe 14 and/or the clamp element 16 . This ensures a precise and permanently secure arrangement of the sealing element 17 in the cover 7 .

The sealing element 17 also has two passage channels 22 which run parallel to one another straight through the sealing element 17 in the longitudinal extension of the sealing element 17 . Each of the through channels 22 has a substantially continuous cross section. Two cross-sectional constrictions 23 are formed in each of the through-channels 22 . Each of the cross-sectional tapers 23 is formed by a radial projection 24 which extends over the circumference of the respective through-channel 22 and forms an annular projection in this respect. The radial projection 24 thus protrudes into the respective through-channel 22, as a result of which its cross section is locally tapered. The radial projections 23 are much shorter in the longitudinal extension of the respective through-channel 22 than the respective through-channel 22 and are arranged at a distance from one another in the longitudinal extension, as shown in FIG 3 shown as an example. The radial projections 24 are in particular formed in one piece with the sealing element 17, so that their shape and position are permanently and reliably ensured. The radial projections 24 are designed in such a way that the reduction in cross section 23 caused by them forms an inner diameter of the through-channel 22 that is smaller than the outer diameter of the electrical conductors 6.

If the conductors 6 are pulled through the through-channels 22 during assembly of the connection device 12 , the radial projections 24 cause an increased resistance which, however, can be overcome due to the elasticity of the sealing element 17 . In the assembled position as shown in 2 is shown, the electrical conductors 6 are optionally held locked in the sealing element 17 by the radial projections 24 in a non-positive manner, so that the non-positive connection forms an additional tension lock 25 which has an advantageous effect on the cable 5 .

If the electrical conductors 6 each have insulation themselves and thus form independent cables, the radial projections 24 also preferably produce a form-fitting connection between the cables and the sealing element 17 in that the radial depressions 24 deform the jacket of the respective cable and thereby Longitudinal extension produce a form fit, which acts in addition to the adhesion. In any case, the radial projections 24 form a seal with the respective cable 5 , which ensures that moisture or liquid cannot pass through the sealing element 17 along the respective cable 6 .

4 shows a perspective top view of the connection device 12 with a view of the clamp element 16 on the side of the cover 7 facing the cable 5, the clamp element 16, the sealing element 17 and the conductors 6 being shown in section here.

The shaped element 17 not only has an outer contour adapted to the cover 7 along its longitudinal extent, but also when viewed in cross section. In particular, the sealing element 17 and the cover 7 form an anti-rotation device 27 . For this purpose, the cross section of the sealing element 17 and the opening 14 of the cover 7 have a contour that deviates from the circular shape. In particular, in the present case the sealing element 17 has two side wall sections 28 which are aligned parallel to one another and run straight and which prevent the sealing element 17 from twisting in the through-opening 14 . As a result, torsional forces that could act on the cable 5 and/or the connection device 12 are also reliably absorbed by the cover 7 and damage to the cable 5 or the connection of the cable 5 to the contact plug 10 is reliably prevented.

5 shows a detailed view of the connecting device 12 in the area of the strain relief or strain relief device 30. The retaining bush 29 is cup-shaped, with a base 31 facing the sealing element 17, with an outer wall 32 extending over the outer circumference and with one or more inside the outer wall 32 arranged partitions 33, through which receiving sections 34 are formed, each serving to receive one of the cables 5. A recess 35 is formed in the base for each receiving area 34, through which the respective cable 5 can be inserted into the retaining bush 29 is introduced, so that it rests in the respective receiving area 34 . The recesses 35 are designed as bores or openings closed on the peripheral side, the inner diameter of which corresponds to the outer diameter of the cable 5 and is optionally slightly larger than this. On the side facing away from the base 31, the receiving areas 34 are each open, with an inner diameter that is larger than the inner diameter of the recesses 35.

Each cable 5 is assigned a holding element 36 which is attached to the respective cable 5 and is located in the respective receiving area 34 . The holding elements 36 are designed in the manner of cable clamps and are fastened to the respective cable 5 by plastic deformation. According to the present exemplary embodiment, the holding elements 36 have a first section 37 which is clamped directly onto the electrical conductor 6 and a second section 38 which is clamped onto the sheathing of the cable 5 . The clamped arrangement of the holding element 36 for the in 5 cable 5 on the right is shown, while with reference to FIG 5 cable shown on the left and the holding element 36 is formed cut. At least section 38 of holding element 36 protrudes laterally from cable 5 so far that it protrudes beyond the inner diameter of recess 35 and thus serves as a retaining stop 39 for cable 5 on floor 31, viewed axially or in the longitudinal direction of cable 5. The holding element 36 can therefore not be pulled through the recess 35 and is rather prevented from doing so by the bottom 31 in a form-fitting manner. Due to the fact that the holding element 36 is attached to the respective cable 5 , tensile forces that are exerted on the cable 5 are conducted through the holding element 36 into the base 31 , which in turn is supported on the sealing element 17 . The sealing element 17 thus also absorbs the corresponding tensile forces and can also be elastically deformed if the tensile forces are sufficiently high. This ensures that the train protection 30 is particularly robust. The ends of the cable 5 that are beyond the retaining bushing 29 from the perspective of the sealing element 17 are connected to the contact plugs 11 and the advantageous strain relief device 30 ensures that tensile forces acting on the cable 5, as indicated by an arrow 26 in 2 and 5 shown, do not affect the electrical connection points to the contact plugs 11 and thereby a secure and permanent electrical connection of the contact plugs 11 with the cables 5 or their conductors 6 is guaranteed.

Claims (16)

Connection device (12) for a dosing module (2) of an exhaust gas aftertreatment system (1) for a motor vehicle, with a cover (7) having a through opening (14) for tight attachment to an opening (8) of the dosing module (2), with at least one at least a cable (5) having an electrical line (6) which extends through the through-opening (14) and having an elastically deformable sealing element (17) which is located between the cover (7) and the at least one cable (5) and/or or the electrical conductor (6) in order to tightly close the passage opening (14), characterized in that the sealing element (17) has at least one passage channel (22) for the at least one cable (5) and/or the at least one conductor ( 6), at one end - as seen in the direction of extension of the through-channel (22) - rests against the cover (7) and at the other end is arranged on a holding bush (29) into which the cable (5) and/or the electrical conductor (6) passes an ow recess (35) is guided in a bottom (31) of the retaining bush (29), and wherein a retaining element (36) is fastened to the cable (5) and/or the conductor (6) and is positioned laterally from the cable (5 ) or the conductor (6) so that it rests against the bottom (31) of the retaining bush (29) in the longitudinal extension of the cable (5) or conductor (6). connection device claim 1 , characterized in that the holding element (36) is clamped or crimped to the cable (5) and/or conductor (6). Connection device according to one of the preceding claims, characterized in that the retaining element (36) completely or almost completely encloses the cable (5) and/or the conductor (6) on the peripheral side. Connection device according to one of the preceding claims, characterized in that the recess (35) in the base (31) of the retaining bush (29) corresponds to the outer diameter of the cable (5) and/or the conductor (6) or is only slightly larger. Connection device according to one of the preceding claims, characterized in that a form-fitting anti-rotation device (27) is formed between the sealing element (17) and the cover (7). connection device claim 5 , characterized in that it has an outer contour adapted to the through-opening (14) for surface contact with the cover (7) in the through-opening (14). Connection device according to one of the preceding claims, characterized in that in the through-channel (22) at least one cross-sectional taper (23) for producing a positive and / or non-positive tension lock (25) for the cable (5) and / or the electrical conductor (6) is formed. connection device claim 7 , characterized in that the cross-sectional constriction (23) is formed by at least one radial projection (24) protruding into the through-channel (22). Connection device according to one of the preceding claims, characterized in that the at least one radial projection extends over the entire circumference of the through-channel (22) as an annular projection. Connection device according to one of the preceding claims, characterized in that in the through-channel (22) at least two radial projections (24) are arranged at a distance from one another in the longitudinal extension of the through-channel (22). Connection device according to one of the preceding claims, characterized in that the sealing element (17) has at least one further through-channel (22) with at least one cross-sectional narrowing (23). connection device claim 11 , characterized in that the passage channels (22) are of identical design. Connection device according to one of Claims 11 and 12 , characterized in that the passage channels (22) extend parallel to one another, at least in sections, through the sealing element (17). Connection device according to one of Claims 11 until 13 , characterized in that the through-channels (22) extend straight through the sealing element (17). connection device claim 8 , characterized in that the respective radial projection (24) is formed in one piece with the sealing element (17). Connection device according to one of the preceding claims, characterized in that a contact plug (10) is fastened in the cover (7) and that the respective conductor (6) is electrically connected to the contact plug (10).

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