EP3767750B1 - Electric connector, insulated safety element and method for mounting an electrical connector - Google Patents

Description

The invention relates to an electrical plug connector, having an inner conductor contact element, an outer conductor contact element and an insulating protection element arranged between the inner conductor contact element and the outer conductor contact element, according to the preamble of claim 1.

The invention also relates to a method for assembling an electrical plug connector, which has an inner conductor contact element, an outer conductor contact element and an insulating protection element arranged between the outer conductor contact element and the inner conductor contact element.

As part of the assembly of an electrical connector, the inner conductor contact elements of the connector must be connected to their associated inner conductors of an electrical cable. In the case of shielded electrical plug connectors, an outer conductor contact element is also provided, which surrounds the inner conductor contact elements and must be connected to an outer conductor shield of the electrical cable.

As a rule, the outer conductor shield of the electrical cable is in the form of a braided outer conductor shield made up of a number of individual wires that are intertwined with one another. Inadequate design and routing of the braided outer conductor shield or generally when connecting the braided outer conductor shield to the outer conductor contact element of the electrical connector can result in the individual wires of the braid separating. These individual wires can finally produce an electrical connection or a short circuit between the inner conductor contact element and the outer conductor contact element.

Irrespective of the field of application of the electrical connector, a short circuit between the inner conductor(s) and outer conductor due to protruding individual wires in a braided cable shield has been a known problem for a long time. In order to reliably prevent the inner conductor contact elements from being contacted by protruding individual wires of the outer conductor braided shield of an electrical cable, insulating parts or insulating protection elements are usually arranged between the inner conductor contact elements and the outer conductor contact element. This can involve, for example, electrically insulating plastic rings or insulating housings of the electrical connector with individual receptacles for accommodating the inner conductor contact elements.

In addition to process reliability, a particularly economical manufacturing process and in particular also a short process time are often required for the production of electrical plug connectors, in particular in order to be able to provide mass production. In this regard, a construction of the electrical connector in which an insulating part or insulating protection element is arranged between the inner conductor contact elements and the outer conductor contact element is comparatively impractical, since the insulating protection element limits the options for fastening the inner conductor contact element to the inner conductors of the electrical cable. As a rule, an insulating protection element is used, which ensures free assembly access through assembly recesses in the outer conductor contact element up to the inner conductor contact elements. For example, assembly tools, in particular screwdrivers, can then be passed through the outer conductor contact element for fastening the inner conductor contact element to the inner conductor of the electrical cable through the assembly access.

However, due to the assembly access, there is in turn the possibility of a short circuit due to protruding individual wires of the outer conductor braided shield of the electrical cable. The possibility of a short circuit is thus reduced by the insulating protection element mentioned, but is not completely ruled out. This is unacceptable in particular for safety-critical applications, for example for high-voltage plug connectors, or for the transmission of critical data signals, for example in the context of autonomous operation of a motor vehicle.

To solve the problem, for example, in the EP 0 665 608 A2 proposed to coat a screw provided for connecting an inner conductor contact element to an inner conductor of the electrical cable with an electrically insulating material in the area of the screw tip, which is connected to the inner conductor of the electrical cable. Even if a single wire of the cable's outer conductor shield braid makes electrical contact with the screw head through the assembly access, a short circuit with the inner conductor of the cable can still not occur.

However, the coating of the screw is comparatively complex and expensive. Furthermore, such a solution, in particular for safety-critical power cables or high-voltage cables, sometimes still cannot be sufficiently safe.

For further background is also on the DE 20 2010 009 598 U1 referred, which has a connector with at least one inner conductor part, which is designed for electrical and mechanical connection to an inner conductor of a cable, in particular an HF cable or a power cable, an outer conductor part, which is designed for electrical and mechanical connection to an outer conductor of the cable and electromagnetic shielding of the plug connector, and an insulating part, which has at least one axial through hole for receiving at least one inner conductor part for holding the inner conductor part at a predetermined position relative to the outer conductor part. In addition to the general technological background, the GB 2 299 900 A and the US 5,632,655A referenced, each also relating to electrical connectors.

In view of the known state of the art, the object of the present invention is to provide an electrical connector which is particularly suitable for safety-critical applications and inexpensive mass production.

Finally, it is also the object of the invention to provide a method for assembling an electrical plug connector that can be particularly advantageous for producing a plug connector that is suitable for safety-critical applications in the context of mass production.

The object is achieved for the electrical connector with the features listed in claim 1. With regard to the method, the object is achieved by the features of claim 14.

The dependent claims and the features described below relate to advantageous embodiments and variants of the invention.

An electrical plug connector is provided, having (at least) an inner conductor contact element, an outer conductor contact element and an insulating protection element arranged between the inner conductor contact element and the outer conductor contact element. The outer conductor contact element has (at least) one mounting recess for providing (at least) one mounting access for fastening the inner conductor contact element to an inner conductor of an electrical cable.

In principle, within the scope of the invention, any plug connector can be provided which has any number of inner conductor contact elements. For example, within the scope of the invention, an electrical connector can have exactly one inner conductor contact element or more inner conductor contact elements, for example two inner conductor contact elements or more inner conductor contact elements, three inner conductor contact elements or more inner conductor contact elements, four inner conductor contact elements or even more inner conductor contact elements. An electrical plug connector with exactly two inner conductor contact elements is preferably provided.

If an electrical connector is provided with only one inner conductor contact element, this can preferably be designed as a coaxial connector.

The electrical plug connector is preferably designed as a plug connector for power transmission or for supplying power to electrical assemblies. The connector can be used as a low-voltage connector or be designed as a high-voltage connector (for supply voltages greater than 60 V). The electrical plug connector can, for example, be advantageous for transmitting currents at voltages of less than one volt or more than 1,000 volts, for example also at voltages of 5 volts to 500 volts, preferably 12 volts to 400 volts, particularly preferably 24 volts to 230 volts, and very particularly preferably 48 volts to 110 volts, for example also 60 volts. The connector can be well suited for the transmission of direct current as well as alternating current.

The electrical plug connector is particularly preferably designed as a plug connector for mobile radio technology, for example for supplying an active mobile radio antenna and/or what is known as a remote radio unit, or for vehicle technology, for example for an electric vehicle.

The term “vehicle” in the present case describes any means of transportation, in particular vehicles on land, on water or in the air, including spacecraft.

An electrical connector can be a plug, bulkhead, socket, coupler, or adapter. The term "plug connector" used in the context of the invention is representative of all variants.

The assembly access for fastening the inner conductor contact element to the inner conductor of the electrical cable can be designed in particular for inserting or passing through an assembly tool, for example a screwdriver for fastening a screw or a pressing tool.

According to the invention, it is provided that the insulating protection element can be displaced between an assembly position in which assembly access through the assembly recess to the inner conductor contact element is released, and an insulating protection position in which assembly access to the inner conductor contact element is blocked by the insulating protection element.

According to the invention, insulation protection against short circuits can thus advantageously be provided between an inner conductor contact element of an electrical connector or an inner conductor of an electrical cable and an outer conductor contact element of the electrical connector or an outer conductor shield of the electrical cable.

Advantageously, an insulating protection element can be provided, which can be preassembled between the outer conductor contact element and the inner conductor contact element before the inner conductor contact element is attached to an associated inner conductor of the electrical cable.

Due to the possibility of moving the insulating protection element after the attachment of the at least one inner conductor contact element to the respective inner conductor of the cable, the installation access are blocked, whereby undesired protruding individual wires of an outer conductor braided shield of the cable cannot penetrate through the assembly access to the inner conductor contact element or the inner conductor. A short circuit due to protruding individual wires can be practically ruled out, which is why a connector according to the invention can be particularly suitable for safety-critical applications.

At the same time, cost-effective assembly with a short process time can be maintained, as a result of which the electrical plug connector can be produced extremely economically in large numbers as part of mass production.

In an advantageous development of the invention, it can be provided that the insulating protection element has (at least) one access opening which is aligned with the mounting recess in the mounting position such that mounting access to the inner conductor contact element is released through the mounting recess and the access opening.

In the insulating protection position, the access opening can also be aligned with the mounting recess in such a way that the mounting access through the mounting recess to the inner conductor contact element is blocked by a continuous wall of the insulating protection element.

An assembly access in the form of an assembly channel can thus be provided through the outer conductor contact element and the insulating protection element up to the inner conductor contact element.

The access opening and the mounting recess are preferably aligned with one another or coaxially in the mounting position of the insulating protection element.

A corresponding mounting recess is preferably provided in the outer conductor contact element for each inner conductor contact element. If, for example, two inner conductor contact elements are provided, two mounting recesses can preferably also be provided in the outer conductor contact element to provide a respective mounting access.

In principle, however, a mounting recess can also be provided in the outer conductor contact element, which provides a common mounting access for mounting a plurality of inner conductor contact elements. However, the configuration of the outer conductor contact element with one mounting recess per inner conductor contact element is preferred.

If several inner conductor contact elements are used, the insulating protection element preferably has one access opening per inner conductor contact element. If, for example, two inner conductor contact elements are provided, two access openings can preferably be formed in the insulating protection element, which are arranged in the assembly position of the insulating protection element in relation to the one or more assembly recesses in the outer conductor contact element in such a way that at least one assembly access for assembly of one of the two inner conductor contact elements is released, preferably both assembly accesses to both inner conductor contact elements are released at the same time.

If several inner conductor contact elements are provided, the insulating protection element can also have a smaller number of access openings than inner conductor contact elements, for example only a single access opening. The insulating protection element can then, for example, be displaceable between a plurality of mounting positions and the insulating protection position. For example, a first mounting position can be provided in which a first mounting access is released through a first mounting recess to a first inner conductor contact element. Furthermore, a second mounting position can be provided in which a second mounting access is released through a second mounting recess to a second inner conductor contact element. However, an embodiment of the invention is preferred according to which the insulating protection element has precisely one assembly position and one insulating protection position and can only be displaced between these two positions.

The number of inner conductor contact elements preferably corresponds to the number of mounting recesses and the number of access openings.

According to a development of the invention, it can be provided that an insulating part is arranged between the inner conductor contact element and the outer conductor contact element, which has an assembly opening that is able to provide assembly access together with the assembly recess of the outer conductor contact element.

In particular, the insulating part can be provided in order to provide (at least) a receptacle for the (at least one) inner conductor contact element in the electrical plug connector. The insulating part can be designed, for example, as an inner housing shell of the electrical connector.

The insulating part can primarily ensure that no short circuit can occur between the outer conductor contact element and the inner conductor contact element or elements. This primary insulating protection can then advantageously be combined with the insulating protection element according to the invention, after which the installation access for fastening the inner conductor contact element to the at least one inner conductor of the cable is released or blocked by the insulating protection element. The dimensions of the insulating protection element can be reduced and the structure simplified if the connector also has the static or immovable insulating part between the inner conductor contact element(s) and the outer conductor contact element and essentially only the dynamic part or the movable part of the insulation is provided by the insulating protection element must become.

The insulating part and the insulating protective element are preferably parts that are independent of one another.

According to a development of the invention, it can be provided that the electrical plug connector has a round geometry (or is designed as a round plug connector), with the outer conductor contact element, the inner conductor contact element, the insulating part and/or the insulating protection element having a substantially round cross section, in particular a hollow cylindrical have a round cross-section.

The invention can be particularly well suited for use with round connectors, although the structure of the connector can in principle be arbitrary. For example, rectangular plug connectors can also be provided, for example flat plugs.

The electrical connector is not limited to a specific connector type, the invention being particularly suitable for connectors for power transmission and for connectors for high-frequency technology. In particular, it can be a PL, BNC, TNC, SMBA (FAKRA), SMA, SMB, SMS, SMC, SMP, BMS, HFM (FAKRA-Mini), H-MTD, BMK, Mini-Coax or MATE type connector -AX trade.

The invention is particularly advantageous for plug connectors with inner conductor contact elements with a large cross section for high current transmission. An electrical plug connector can thus be provided for supplying electrical assemblies with electrical power.

In a development of the invention, it can be provided that the insulating protection element is in a groove in the outer conductor contact element, in a groove in the inner conductor contact element, in a groove in the insulating part, in a groove formed between the insulating part and the outer conductor contact element and/or in a groove formed between the insulating part and the Inner conductor contact element formed groove is guided.

The groove or the corresponding recess in the outer conductor contact element can preferably be designed in such a way that it intersects the mounting recess.

The groove or the corresponding recess in the insulating part can preferably be designed in such a way that it intersects the assembly opening.

The groove or the corresponding recess is particularly preferably formed in a transition region between the outer conductor contact element and the insulating part, since this can be implemented particularly easily in terms of production technology. In particular, however, a groove or a corresponding recess can also be possible only in the outer conductor contact element or only in the insulating part. Even a groove in the inner conductor contact element can be provided.

In a development of the invention it can be provided that the mounting recess of the outer conductor contact element, the access opening of the insulating protection element and/or the mounting opening of the insulating part is designed as a bore or slot.

A bore or a slot can be easily realized in terms of manufacturing technology. In principle, however, other geometries can also be provided for the assembly recess, the access opening and/or the assembly opening, in particular also a rectangular geometry.

The mounting recess of the outer conductor contact element is particularly preferably designed as a slot or rectangular recess.

The access opening of the insulating protection element and the assembly opening of the optional insulating part are particularly preferably designed as a bore.

In an advantageous development of the invention, it can be provided that the inner conductor of the cable is fastened to the inner conductor contact element by means of a screw. The assembly access preferably extends in such a way that the screw can be actuated by inserting an assembly tool into the assembly access.

Within the scope of the invention, the screw can be regarded as part of the electrical connector.

A metallic screw is preferably provided.

In an advantageous development of the invention, it can be provided that the screw is completely covered by the insulating protection element when the insulating protection element is in the insulating protection position.

As a result, a particularly reliable insulation protection against short circuits can be provided.

In a further development of the invention it can be provided that the diameter of a screw head of the screw is larger than the diameter of the access opening of the insulating protection element.

If the diameter of the screw head of the screw is larger than the diameter of the access opening of the insulating protection element, for example larger than the diameter of a bore in the insulating protection element, accidental loss of the screw through the access opening in a preassembled delivery state can be prevented in an advantageous manner.

In particular, the diameter of the access opening of the insulating protection element can be larger than the diameter of the assembly tool and smaller than the diameter of the screw head. In this way, the assembly tool can be passed through the access opening, but at the same time a previously inserted screw can no longer be lost through the access opening of the insulating protection element.

In an advantageous development of the invention, it can be provided that the insulating protection element has latching means for latching with a corresponding latching element of the outer conductor contact element, the inner conductor contact element and/or the insulating part in order to latch the insulating protection element in the assembly position and/or in the insulating protection position.

The insulating protection element can preferably be latched at least in the insulating protection position. Particularly preferably, however, the insulating protection element can be latched both in the assembly position and in the insulating protection position.

The latching preferably takes place with the insulating part or with another housing component of the electrical plug connector.

Provision can be made for a latching lug or a pin formed laterally on the insulating protection element to be guided via a rail guide with one or two latching recesses in the mounting recess of the outer conductor contact element. However, the detent or the pin is preferably guided in a corresponding rail guide with one or two detent recesses in the insulating part.

Axial latches or axially extending latching means can be provided in the insulating protection element, but radially extending latching means can also be provided. Axial latching means are preferably provided.

The latching means, for example latching lugs, of the insulating protection element can be formed, for example, on an elastic spring arm of the insulating protection element, for example on a free end of the spring arm or in the middle (or in a middle section) of a spring arm connected on both sides.

The spring arm can be implemented particularly advantageously by means of an elongated hole or one or more slots along the circumference of the insulating protection element.

The deformability or the elasticity of the spring arm can be selected such that the spring arm provides sufficient holding force for the latching and can bend sufficiently reversibly during latching or during the release of the latching without experiencing (irreversible) plastic deformation.

The spring mechanism, in particular based on a spring arm, can be used to deliberately trigger a displacement of the insulating protection element from the insulating protection position to the assembly position (or vice versa). The spring mechanism can be defined by the material of the insulating protection element and by the geometry of the insulating part and the outer conductor contact element. The interaction between the insulating part, outer conductor contact element and insulating protection element can be adjusted in order to set the force required to move the insulating protection element (starting from the assembly position and/or insulating protection position).

In an advantageous development of the invention, it can be provided that the insulating protection element is partially ring-shaped or ring-shaped, with the insulating protection element being rotatably and/or axially displaceable between the assembly position and the insulating protection position with respect to the longitudinal axis of the electrical connector.

The insulating protection element is particularly preferably designed in the form of a part ring or ring and can be displaced in rotation with respect to the longitudinal axis of the electrical plug connector. The movement of the insulating protection element between the assembly position and the insulating protection position can therefore be effected by a rotary movement about the central axis of the connector. In principle, however, an axial displacement can also be provided.

In principle, the displacement of the insulating protection element between the mounting position and the insulating protection position can even have a rotational or radial component as well as an axial component. For example, a slide guide for guiding a sliding block of the insulating protection element in the electrical connector, for example in the insulating part or the outer conductor contact element, can be provided for such a movement.

The use of a partially ring-shaped or ring-shaped insulating protection element can be particularly suitable for use with an electrical plug connector with a round geometry.

Several insulating protection elements (partial ring-shaped, ring-shaped or plate-shaped) can also be provided within the scope of the invention, for example one insulating protection element for each inner conductor contact element or for each screw for fastening the inner conductor contact element. In particular, a respective partial ring-shaped insulating protection element or a respective platelet-shaped insulating protection element (described below) can then be provided for each inner conductor contact element or for each screw provided for fastening the inner conductor contact elements.

As indicated above, it can also be provided in one embodiment of the invention that the insulating protection element is designed in the form of a platelet, the insulating protection element being based on the Longitudinal axis of the electrical connector is axially displaceable between the mounting position and the insulating protection position.

A platelet-shaped insulating protection element can be particularly well suited for use with an electrical plug connector with a rectangular, in particular flat, geometry.

In a development of the invention, it can be provided that the insulating protection element has at least one guide means, in particular a radially or axially projecting lug or a web, in order to be able to move the insulating protection element in its installed state within the outer conductor contact element.

The insulating protection element can thus advantageously be displaceable from the outside, for example by means of the assembly tool or a finger of the fitter or user of the plug connector.

The at least one guide means can also be designed in the form of at least one groove or at least one recess, for example also in the form of grooves in the outer wall of the insulating protection element.

Optionally, however, a separately designed guide means can also be dispensed with. For example, the insulating protection element itself or the access opening of the insulating protection element can be used to move the insulating protection element. For example, the assembly tool provided for fastening the inner conductor contact element (or a fitter's finger) can be partially inserted into the access opening and the insulating protection element can then be displaced by initiating the movement at the access opening. In particular, a mounting recess in the outer conductor contact element designed as a slot or a rectangular, elongated recess can be well suited for this variant.

According to a development of the invention, it can be provided that several inner conductor contact elements, preferably two inner conductor contact elements or even more inner conductor contact elements, and a number of corresponding mounting recesses and access openings are provided.

As already mentioned, the invention is basically suitable for use with a plug connector with any number of inner conductor contact elements. However, two inner conductor contact elements are particularly preferably provided, the respective fastening of which to an inner conductor of the electrical cable is made possible by a respective installation access through corresponding installation recesses or access openings.

According to the invention, a captive electrically insulating insulating protection element can be provided to protect against a short circuit between the inner conductor or the inner conductors and an outer conductor shield of an electrical cable.

In the insulating protection position, conductive screws used in particular for fastening the inner conductor contact element to the inner conductor can be completely electrically insulated, as a result of which no electrical connection can arise between the outer conductor shield of the cable and the inner conductor contact element.

The insulating protection element can also be used for permanent protection against the loss of clamping screws or screws for fastening inner conductor contact elements to the inner conductors of the cable.

The insulating protection element according to the invention is particularly cost-optimized and can be extremely easy to install during assembly of the electrical connector and, in particular, also suitable for mass production of connectors.

The insulating protection element can optionally also have an assembly prevention device, for example a lug that extends axially in the direction of the cable, in order to positively block final assembly of the electrical connector, in particular with regard to screwing on a locking nut, a terminating sleeve or another connector component, if the insulating protection element does not move is in the insulating protection position.

1. a) Verschieben des Isolierschutzelements in eine Montageposition, in der (wenigstens) ein Montagezugang zu dem Innenleiterkontaktelement durch (wenigstens) eine in dem Außenleiterkontaktelement bereitgestellte Montageausnehmung freigegeben ist;
2. b) Befestigen des Innenleiterkontaktelements an einem Innenleiter eines elektrischen Kabels durch den freigegebenen Montagezugang; und
3. c) Verschieben des Isolierschutzelements in eine Isolierschutzposition, in der der Montagezugang zu dem Innenleiterkontaktelement durch das Isolierschutzelement versperrt wird.

The invention also relates to a method for assembling an electrical plug connector which has (at least) an inner conductor contact element, an outer conductor contact element and an insulating protection element arranged between the outer conductor contact element and the inner conductor contact element. At least the following method steps are provided as part of the method according to the invention:

1. a) moving the insulating protection element into an assembly position in which (at least) an assembly access to the inner conductor contact element is released through (at least) one assembly recess provided in the outer conductor contact element;
2. b) attaching the inner conductor contact element to an inner conductor of an electrical cable through the released assembly access; and
3. c) moving the insulating protection element into an insulating protection position in which the assembly access to the inner conductor contact element is blocked by the insulating protection element.

The aforementioned first method step (moving the insulating protection element into the assembly position) can in particular already take place implicitly during pre-assembly of the insulating protection element.

The method step of attaching the inner conductor contact element or elements to the corresponding inner conductors of the cable can preferably be carried out by pressing or clamping the inner conductor in a cylindrical inner conductor contact element using a screw.

To attach the inner conductor contact element, an assembly tool, for example a screwdriver, can be passed through the assembly access when the insulating protection element is in the assembly position.

The insulating protection element can be moved between the mounting position and the insulating protection position, in particular by rotating it.

Advantageously, it can be ensured that, in particular, screw heads for fastening the inner conductor contact elements do not become visible unintentionally, which would result in the possibility of a short circuit.

Provision can be made for the insulating protection element to latch in the assembly position and/or (in particular) in the insulating protection position with a connector component, for example an inner housing shell or an insulating part. In particular, if latching is provided in the insulating protection position, the insulating protection element cannot be unintentionally moved back into its assembly position or overturned. It can thus be ensured that the insulating protection element does not move back independently as a result of vibrations or shocks during assembly, transport and/or use of the plug connector. The insulating protection element can only be brought back into the mounting position if a deliberate, increased effort is made.

Since the insulating protection element according to the invention can optionally be preassembled in the outer conductor contact element, preferably within a groove of the outer conductor contact element, an insulating part or a groove formed between the outer conductor contact element and the insulating part, this cannot be forgotten by the installer when installing the cable.

If the diameter of the access opening of the insulating protection element is smaller than the diameter of a screw head of a screw that is used, the insulating protection element can also prevent the clamping screws from losing at any time—even in the assembly position. The screws used can therefore not be lost within the insulating protection element, even when they are delivered loose.

Conventional screwdrivers can advantageously be used to mount the inner conductor contact elements on the inner conductors of the cable. Special tools are therefore not absolutely necessary.

The invention is particularly suited for use with circular connectors, and more particularly for circular connectors in which one or more inner conductor contact elements must be clamped with screws to inner conductors of an electrical cable and separated from an outer conductor screen of the cable.

The invention also relates to an advantageous use of an electrical connector according to the above and following statements for the power supply of active mobile radio antennas.

Comparatively high currents are required (e.g. 50 amperes at 60 volts) for the power supply of active mobile radio antennas, for example. The cable cross-section of the inner conductors of the transmission cables used on a mobile phone mast is designed to be correspondingly large. The inner conductors of the cable can therefore preferably be fastened in a corresponding power connector by means of a screw connection. As a rule, a metal screw is used for each inner conductor, which is fed radially through the mounting recess of the outer conductor contact element and screwed into an aligned threaded hole provided in the insulating part or in the inner conductor contact element. Finally, a ground shield or an outer conductor shield of the electrical cable can be routed over the outer surface of the outer conductor contact element.

The insulating protection element according to the invention can then reliably prevent an undesired short circuit between an inner conductor and the outer conductor shield of the cable by moving the insulating protection element into the insulating protection position according to the invention.

Furthermore, the invention relates to an electrical plug-in connection made up of an electrical plug-in connector according to the statements made above and below, and to an electrical mating plug-in connector that can be plugged together with the electrical plug-in connector.

Finally, the invention also relates to a vehicle having at least one electrical connector according to the above and following statements or a mobile radio antenna with an electrical connector according to the above and following statements.

The invention also relates to an assembly prevention for an insulating protection element. The insulating protection element can preferably be designed according to the information given above and below. In principle, however, the assembly prevention can be suitable for any insulating protection elements. The assembly prevention can be designed to a final assembly of an electrical connector to block in a form-fitting manner when the insulating protection element is not in an insulating protection position (in particular an insulating protection position described above and below). The installation prevention can also be designed to positively block a mating connector from being inserted into the connector when the insulating protection element is not in an insulating protection position (in particular an insulating protection position described above and below). The assembly prevention can preferably have a nose extending axially and/or radially in the direction of the cable.

Features that were described in connection with the electrical plug connector according to the invention can of course also be implemented advantageously for the insulating protection element, the electrical plug connection, the use according to the invention, the vehicle, the mobile radio antenna, the assembly method and the assembly prevention - and vice versa. Furthermore, advantages that have already been mentioned in connection with the electrical plug connector according to the invention can also be understood in relation to the insulating protection element, the electrical plug connection, the use according to the invention, the vehicle, the mobile radio antenna, the assembly method and the assembly prevention - and vice versa.

In addition, it should be pointed out that terms such as "comprising", "having" or "with" do not exclude any other features or steps. Furthermore, terms such as "a" or "that" which indicate a singular number of steps or features do not exclude a plurality of features or steps - and vice versa.

In a puristic embodiment of the invention, however, it can also be provided that the features introduced in the invention with the terms “comprising”, “having” or “with” are listed exhaustively. Accordingly, one or more listings may be considered complete within the scope of the invention, e.g. considered one for each claim. The invention can, for example, exclusively consist of the features mentioned in claim 1.

Furthermore, it should be emphasized that the values and parameters described here are deviations or fluctuations of ±10% or less, preferably ±5% or less, more preferably ±1% or less, and very particularly preferably ±0.1% or less of the respectively named Include value or parameter, provided that these deviations are not excluded in the implementation of the invention in practice. The specification of ranges by starting and ending values also includes all those values and fractions that are enclosed by the respectively named range, in particular the starting and ending values and a respective mean value.

Exemplary embodiments of the invention are described in more detail below with reference to the drawing.

The figures each show preferred exemplary embodiments in which individual features of the present invention are shown in combination with one another. Features of an exemplary embodiment can also be implemented independently of the other features of the same exemplary embodiment and can accordingly easily be connected by a person skilled in the art to further meaningful combinations and sub-combinations with features of other exemplary embodiments.

Elements with the same function are provided with the same reference symbols in the figures.

Figur 1

einen erfindungsgemäßen elektrischen Steckverbinder und ein elektrisches Kabel in perspektivischer Darstellung;

Figur 2

einen Teilschnitt des elektrischen Steckverbinders und des elektrischen Kabels der Figur 1;

Figur 3

eine weitere Schnittdarstellung des elektrischen Steckverbinders der Figur 1 bei ausgeblendetem Kabel;

Figur 4

ein erfindungsgemäßes, ringförmiges Isolierschutzelement in einer perspektivischen Darstellung;

Figur 5

einen Querschnitt durch den elektrischen Steckverbinder der Figur 1 zur Verdeutlichung der Befestigung der Innenleiterkontaktelemente mittels eines durch den Montagezugang eingeführten Montagewerkzeugs;

Figur 6

einen Ausschnitt eines elektrischen Steckverbinders gemäß einem zweiten Ausführungsbeispiel mit einem ringförmigen Isolierschutzelement in der Montageposition mit einer aus dem Außenleiterkontaktelement axial herausragenden Fahne zum Einleiten der Verschiebung;

Figur 7

den elektrischen Steckverbinder der Figur 6 mit ausgeblendetem Außenleiterkontaktelement;

Figur 8

den elektrischen Steckverbinder der Figur 6 mit ausgeblendetem Außenleiterkontaktelement in einer um 90° verdrehten Ansicht zur Darstellung von Rastmitteln des Isolierschutzelements;

Figur 9

den elektrischen Steckverbinder der Figur 6 mit dem Isolierschutzelement in der Isolierschutzposition;

Figur 10

den elektrischen Steckverbinder der Figur 6 mit dem Isolierschutzelement in der Isolierschutzposition und ausgeblendetem Außenleiterkontaktelement;

Figur 11

den elektrischen Steckverbinder der Figur 6 mit dem Isolierschutzelement in der Isolierschutzposition, ausgeblendetem Außenleiterkontaktelement und einer um 90° verdrehten Ansicht zur Darstellung von Rastmitteln des Isolierschutzelements;

Figur 12

ein erfindungsgemäßes, teilringförmiges Isolierschutzelement in einer perspektivischen Darstellung;

Figur 13

eine vordere Gehäusebaugruppe eines elektrischen Steckverbinders in perspektivischer Darstellung mit dem teilringförmigen Isolierschutzelement der Figur 12 in der Montageposition;

Figur 14

die vordere Gehäusebaugruppe des elektrischen Steckverbinder der Figur 13 mit dem teilringförmigen Isolierschutzelement der Figur 12 in der Isolierschutzposition;

Figur 15

einen ersten Verfahrensschritt eines Montageverfahrens für einen erfindungsgemäßen Steckverbinder;

Figur 16

einen zweiten Verfahrensschritt eines Montageverfahrens für einen erfindungsgemäßen Steckverbinder;

Figur 17

einen dritten Verfahrensschritt eines Montageverfahrens für einen erfindungsgemäßen Steckverbinder;

Figur 18

einen vierten Verfahrensschritt eines Montageverfahrens für einen erfindungsgemäßen Steckverbinder;

Figur 19

einen fünften Verfahrensschritt eines Montageverfahrens für einen erfindungsgemäßen Steckverbinder; und

Figur 20

einen sechsten Verfahrensschritt eines Montageverfahrens für einen erfindungsgemäßen Steckverbinder.

They show schematically:

figure 1

an electrical connector according to the invention and an electrical cable in a perspective view;

figure 2

a partial section of the electrical connector and the electrical cable of FIG figure 1 ;

figure 3

another sectional view of the electrical connector of figure 1 with hidden cable;

figure 4

an inventive, annular insulating protection element in a perspective view;

figure 5

a cross section through the electrical connector of figure 1 to illustrate the attachment of the inner conductor contact elements by means of an assembly tool inserted through the assembly access;

figure 6

a section of an electrical connector according to a second embodiment with an annular insulating protection element in the assembled position with a tab protruding axially from the outer conductor contact element for initiating the shift;

figure 7

the electrical connector figure 6 with hidden outer conductor contact element;

figure 8

the electrical connector figure 6 with hidden outer conductor contact element in a view rotated by 90° to show latching means of the insulating protection element;

figure 9

the electrical connector figure 6 with the insulating protection element in the insulating protection position;

figure 10

the electrical connector figure 6 with the insulating protection element in the insulating protection position and hidden outer conductor contact element;

figure 11

the electrical connector figure 6 with the insulating protection element in the insulating protection position, hidden outer conductor contact element and a view rotated by 90° to show latching means of the insulating protection element;

figure 12

a perspective view of a partially ring-shaped insulating protection element according to the invention;

figure 13

a front housing assembly of an electrical connector in a perspective view with the part ring-shaped insulating protection element figure 12 in the assembly position;

figure 14

the front housing assembly of the electrical connector of the figure 13 with the partially ring-shaped insulating protection element figure 12 in the isolation protection position;

figure 15

a first step of an assembly method for a connector according to the invention;

figure 16

a second step of an assembly method for a connector according to the invention;

figure 17

a third step of an assembly method for a connector according to the invention;

figure 18

a fourth step of an assembly method for a connector according to the invention;

figure 19

a fifth step of an assembly method for a connector according to the invention; and

figure 20

a sixth method step of an assembly method for a connector according to the invention.

figure 1 shows an electrical connector 1 according to the invention in a perspective view. The electrical plug connector 1 is shown connected to an electrical cable 2 by way of example.

The invention is only described as an example with reference to the electrical plug connector 1 shown in the figures. In principle, an electrical plug connector according to the invention can have any structure, for example a coaxial structure, a triaxial structure or some other structure. In the exemplary embodiment, the electrical connector 1 has a round geometry by way of example. In principle, however, the invention can also be suitable for use with a rectangular plug connector, for example a flat plug connector.

the figures 2 and 3 show sectional views of the in figure 1 illustrated connector 1 in the longitudinal direction, ie along the longitudinal axis L or along the central axis of the electrical connector 1, wherein figure 2 a partial section through the rear portion of the connector 1 together with the electric cable 2 and figure 3 show a complete section through the connector 1 without the electric cable 2.

The electrical connector 1 has two inner conductor contact elements 3 (cf. in particular figure 3 ). This is only to be understood as an example. In principle, the electrical connector 1 can have any number of inner conductor contact elements 3, for example just one inner conductor contact element 3. The inner conductor contact elements 3 are provided for contacting mating contact elements of a corresponding mating connector (not shown) and are to be electrically connected to the inner conductors 4 of the electrical cable 2, like this especially good in figure 2 is recognizable.

The illustrated electrical plug connector 1 is designed, for example, to transmit high currents. For this purpose, the inner conductors 4 of the cable 2 can be particularly advantageously fastened to the inner conductor contact elements 3 or clamped to them by means of a screw 5 (cf., among other things, FIG. 3). For this purpose, the screws 5 can be fitted particularly advantageously from opposite sides of the connector 1, as illustrated in the exemplary embodiments. For example, a first screw 5 for connecting a first inner conductor 4 to a first inner conductor contact element 3, starting from a first side of the connector 1, and a second screw 5 for mounting a second inner conductor 4 to a second inner conductor contact element 3, starting from one side opposite the first Side of the connector 1, be provided. In principle, however, assembly can also be provided from the same side of the connector 1 or starting from any desired direction.

The electrical connector 1 also has an outer conductor contact element 6 which runs around the inner conductor contact elements 3 for electromagnetic shielding. The outer conductor contact element 6 is provided with an outer conductor shield, in particular an outer conductor braided shield 7 of the electrical Cable 2 connected (cf. e.g figure 2 ). For this purpose, the outer conductor braided shield 7 can, for example, be pressed or clamped between the outer conductor contact element 6 and a—preferably electrically conductive—outer housing 8 of the connector 1, as for example in figure 2 shown. For this purpose, the outer housing 8 can, for example, be screwed onto the outer conductor contact element 6, as described below as part of the assembly process in FIGS Figures 15 to 20 is shown.

An insulating protection element 9 is arranged between the outer conductor contact element 6 and the inner conductor contact elements 3 in order to prevent protruding individual wires of the outer conductor braided shield 7 from unintentionally producing short circuits with one of the inner conductor contact elements 3 . The insulating protection element 9 in the Figures 1 to 3 , 5 to 11 and 15 to 20 shown connector 1 is ring-shaped and exemplified in figure 4 shown in perspective.

For the provision of an assembly access M (example in figure 5 indicated) for fastening the inner conductor contact elements 3 to the respective inner conductors 4 of the electrical cable 2, corresponding mounting recesses 10 are provided in the outer conductor contact element 6, which in the exemplary embodiments are particularly advantageously designed as a slot (cf. e.g. the figures 6 , 9 and 13 and 14).

According to the invention, the insulating protection element 9 is between a mounting position (cf. e.g. the orientation in figure 6 or in figure 13 ) and an insulating protection position (cf. e.g. the orientation in figure 9 or in figure 14 ) moveable. In the assembly position, the insulating protection element 9 is arranged relative to the outer conductor contact element 6 in such a way that the assembly access M is released through the assembly recess 10 of the outer conductor contact element 6 to the respective inner conductor contact element 3 . In contrast, in the insulating protection position, the assembly access M is blocked by the insulating protection element 9 .

The insulating protection element 9 preferably has at least one access opening 11 for this purpose. In the exemplary embodiments, a separate access opening 11 and a separate mounting recess 10 are provided for each inner conductor contact element 3 or for each mounting access M. In the assembly position, the access opening 11 is aligned with the assembly cutout 10 in such a way that the assembly access M to the respective inner conductor contact element 3 is released through the assembly cutout 10 and the access opening 11 . In the insulating protection position, on the other hand, the access opening 11 is shifted accordingly and the installation access M is blocked as a result.

The electrical connector 1 optionally has an insulating part 12 between the inner conductor contact elements 3 and the outer conductor contact element 6 . In the present case, the insulating protection element 9 is guided between the insulating part 12 and the outer conductor contact element 6 , it being possible in principle for the insulating protection element 9 also to be guided between the insulating part 12 and the inner conductor contact elements 3 . Around In order to ensure assembly access M when the insulating protection element 9 is in the assembly position, the insulating part 12 has assembly openings 13 corresponding to the assembly recesses 10 (cf. figure 5 ), which are arranged in alignment with the mounting recesses 10 of the outer conductor contact element 6 .

In the in the Figures 1 to 11 As well as 15 to 20 shown embodiments, the insulating protection element 9 is rotatory relative to the longitudinal axis L of the electrical connector 1 between the assembly position and the insulating protection position. For this purpose, the insulating protection element 9 is guided in a recess or groove 14 formed between the insulating part 12 and the outer conductor contact element 6 . In principle, however, the insulating protection element 9 can, for example, also be guided exclusively in a groove in the outer conductor contact element 6 , in a groove in the inner conductor contact element 3 or even in a groove in the insulating part 12 . The insulating protection element 9 can also be guided in a groove formed between the insulating part 12 and the inner conductor contact element 3 .

In the exemplary embodiments, the access opening 11 of the insulating protection element 9 is designed as a bore, for example. However, the access opening 11 can also be in the form of a slot or other recess, for example also a rectangular recess. This also applies analogously to the mounting recess 10 of the outer conductor contact element 6 and the mounting opening 13 of the insulating part 12.

In figure 5 the attachment of the inner conductor contact elements 3 to the inner conductors 4 of the electrical cable 2 through the released assembly access M is illustrated by way of example on the basis of a cross section through the plug connector 1 . Through the assembly access M, which can be provided by aligning the insulating protection element 9 in the assembly position, an assembly tool, for example the screwdriver 15 shown, can be passed through the assembly recesses 10, assembly openings 13 and access openings 11 to the screws 5 in order to fix the inner conductors 4 within the hollow-cylindrical inner conductor contact elements 3 by tightening the screws 5 to clamp. Torx screws 5 are shown purely as an example; basically any screw type can be provided. Alternatively, a crimping or pressing or a soldering of the inner conductor contact elements 3 and the inner conductor 4 can be provided with a corresponding suitable assembly tool.

To provide protection against loss of the screws 5, it can be provided that the diameter of the screw heads of the screws 5 is larger than the diameter of the access opening 11 of the insulating protection element 9. Although this allows the assembly tool 15 to be passed through the access opening 11, the screw 5 cannot be lost go, even if this is only loose in a delivery state within the insulating protection element 9.

To further clarify the functioning of the insulating protection element 9 and the electrical connector 1 are used Figures 6 to 11 .

In figure 6 is the insulating protection element 9 within the outer conductor contact element 6 in its mounting position and in figure 9 shown in its isolating position. The insulating protection element 9 was, as in figure 9 shown, shifted in rotation to reach the insulating protection position, whereby the assembly access M is blocked and thus the screw 5 is also covered. An unintentional electrical contacting of the screw 5 or the inner conductor contact element 3 by protruding individual wires of the outer conductor braided shield 7 of the cable 2 is no longer possible.

In the in the Figures 6 to 11 shown variant of the insulating protection element 9, the insulating protection element 9 differing from that in FIGS Figures 1 to 5 and 15 to 20 shown embodiments, additional guide means 16, in this case lugs protruding axially from the insulating protection element 9, as a result of which the insulating protection element 9 can be moved particularly comfortably by the user in its mounted state within the outer conductor contact element 6. For a better representation, the outer conductor contact element 6 is in the figures 7 and 10 hidden. In principle, however, a corresponding guide means 16 can also be omitted. For example, the user or the fitter can also move the insulating protection element 9 with his finger or the assembly tool 15, especially if the mounting recess 10 of the outer conductor contact element 6, as shown, is designed as an elongated hole and thus allows sufficient access to the insulating protection element 9 .

The figures also show a way of locking the insulating protection element 9 in the assembly position and in the insulating protection position. This is especially good in the figures 4 , 8th , 11 and 12 recognizable. For this purpose, the insulating protection element 9 has axially protruding latching means 17 which interact with corresponding latching elements 18 of the insulating part 12, which are designed, for example, as rail guides.

In principle, any number of latching means 17 and latching elements 18 can be provided, for example just one latching means 17 and a corresponding latching element 18; in the exemplary embodiment, two latching means 17 and two latching elements 18 are shown on opposite sides of the insulating protection element 9 or the insulating part 12 .

In the exemplary embodiment, latching is provided in the assembly position as well as in the insulating protection position. In principle, however, locking can also be provided only in the assembly position or in the insulating protection position. At least one latching in the insulating protection position can be particularly advantageous, since then the insulating protection element 9 cannot be unintentionally (e.g. during the later use of the connector 1) can be moved back into the "unsafe" assembly position.

In order to make the latching detachable, at least with increased effort, the latching means 17 of the insulating protection element 9 according to Figures 1 to 11 formed in the middle of an elastic spring arm 19. The spring arm 19 is formed, for example, by a slot-shaped recess in the insulating protection element 9 . In principle, however, the spring arm 19 can also be formed in other ways. Furthermore, the latching means 17 can also be fastened to a free end of the spring arm 19 .

The insulating protection element 9 does not necessarily have to be latched onto the insulating part 12 (which is optional in any case). Latching of the insulating protection element 9 can also be provided on the outer conductor contact element 6 or even on one of the inner conductor contact elements 3 . In principle, latching with any connector component of the connector 1 can be provided.

The insulating protection element 9 can also only be designed in the form of a partial ring, in which case one insulating protection element 9 can be provided for each inner conductor contact element 3 in a particularly advantageous manner. An exemplary, partially ring-shaped insulating protection element 9 is shown in figure 12 shown in perspective.

The partially ring-shaped insulating protection element 9 of figure 12 can also be rotationally displaceable with respect to the longitudinal axis L of the electrical connector 1 between the assembly position and the insulating protection position. In the case of a partially ring-shaped insulating protection element 9, however, an axial displacement between the assembly position and the insulating protection position can also be advantageous. Such an axial displacement is exemplified in the Figures 13 and 14 shown.

figure 13 shows the partially ring-shaped insulating protection element 9 within the outer conductor contact element 6 in its assembly position, as a result of which the assembly access M to the corresponding inner conductor contact element 3 is released.

In figure 14 the partially ring-shaped insulating protection element 9 is shown in its insulating protection position. Due to the axial displacement of the insulating protection element 9 or its access opening 11 relative to the mounting recess 10 of the outer conductor contact element 6, the mounting access M is figure 14 connector 1 shown thus blocked.

For the initiation of the axial displacement of the insulating protection element 9 in the Figures 12 to 14 shown guide means 16 (also an axially projecting flag) can be used. Furthermore, the partially ring-shaped insulating protection element 9 in the outer conductor contact element 6, in the insulating part 12 and/or latch in the inner conductor contact elements 3 in the assembly position and/or the insulating protection position, for which purpose a laterally protruding latching means 17 is shown, for example, in figure 12 is shown.

In particular, in the case of an axial displacement of the insulating protection element 9, the insulating protection element 9 can also be designed in the form of small plates (not shown in more detail in the exemplary embodiments).

the Figures 15 to 20 show a method according to the invention for assembling the electrical connector 1 using a few exemplary method steps. In principle, it should be mentioned that further method steps can also be provided. In particular, method steps can also be omitted within the scope of the invention; the figures thus also show, in particular, only optional method steps. Furthermore, the order of the process steps can vary.

First of all, it can be provided that the electric cable 2 is prepared or prefabricated for contacting with the plug connector 1 . For this purpose, the electrical cable 2 can be freed from a cable jacket 20 at its end to be processed. The outer conductor braided shield 7 can then be folded back over the remaining cable sheath 20 . A filling layer (not shown in the figures) that guides the inner conductors 4 together and a cable foil that may be present (also not shown) can then be removed in order to separate the inner conductors 4 and make them accessible for further processing. Then the individual inner conductors 4 can be freed from their insulation 21 at a front section and the cores of the inner conductors 4 can be exposed. Wire sleeves 22 can then be connected to the exposed wires of the inner conductor 4, for example crimped or soldered. This state of the cable is in figure 15 shown.

In figure 15 are also the outer housing 8 and a locking nut 23 already pushed onto the cable sheath 20 of the cable 2 for later assembly. in the in figure 15 In the method step shown, the front housing assembly 25 (also known as the "connector head") consisting of the outer conductor contact element 6, the inner conductor contact elements 3, the insulating part 12, the insulating protective element 9 and a protective cap 24 can finally be pushed onto the inner conductor 4 of the cable 2.

In a subsequent step according to figure 16 For example, the insulating protection element 9 can first be brought into the assembly position (if not already pre-assembled) in order to fasten the inner conductor contact elements 3 to the inner conductors 4 of the cable 2 . Thus, the assembly access M to the inner conductor contact elements 3 through the outer conductor contact element 6 and the insulating part 12 is guaranteed. For example, an in figure 5 shown screwdriver 15 are used to tighten the respective screws 5 for clamping the inner conductor 4 in the inner conductor contact elements 3.

Subsequently, in a subsequent step according to figure 17 the screwdriver 15, a finger of the fitter or any guide means 16 of the insulating protection element 9 can be used to move the insulating protection element 9 into its insulating protection position, in which the installation access M to the inner conductor contact element 3 is blocked by the insulating protection element.

In a subsequent step according to figure 18 Provision can be made for the outer conductor braided shield 7 to be placed on the outer conductor contact element 6 of the connector 1 .

Subsequently, in a further process step, as in figure 19 shown, the outer housing 8 of the connector 1 together with the locking nut 23 are pushed from behind onto the outer conductor contact element 6 and screwed to it. The outer conductor braided shield 7 is hereby clamped between the outer conductor contact element 6 and the outer housing 8 of the connector 1 . Due to the fact that the insulating protection element 9 is in its insulating protection position, any protruding individual wires of the outer conductor braided shield 7 cannot create a short circuit with the inner conductor contact elements 3 .

If necessary, it can be provided that the insulating protection element 9 has an assembly prevention (not shown), which only allows the outer housing 8 of the electrical connector 1 to be assembled when the insulating protection element 9 is in its insulating protection position. For example, a web that protrudes axially in the direction of the cable 2 can be provided for this purpose, which in the assembly position of the insulating protection element 9 blocks the outer housing 8 of the plug connector 1 from being fitted onto the outer conductor contact element 6 in a form-fitting manner and limits the displacement path for the outer housing 8 to the outer conductor contact element 6 only in the insulating protection position releases.

In figure 20 Finally, the fully assembled electrical connector 1 is shown on the cable 2, with the closing nut 23 finally being screwed onto the outer housing 8 in order to provide the seal between the cable 2 and the connector 1 on the one hand and strain relief on the other.

Claims (14)

1. Electrical plug-in connector (1), having an internal conductor contact element (3), an external conductor contact element (6) and an insulating protective element (9) which is arranged between the internal conductor contact element (3) and the external conductor contact element (6), wherein the external conductor contact element (6) has an assembly recess (10) for providing an assembly access point (M) for fastening the internal conductor contact element (3) to an internal conductor (4) of an electrical cable (2),
   characterized in that
   the insulating protective element (9) can be displaced between an assembly position, in which the assembly access point (M) is cleared through the assembly recess (10) to the internal conductor contact element (3), and an insulating protection position, in which the assembly access point (M) to the internal conductor contact element (3) is blocked by the insulating protective element (9).
2. Electrical plug-in connector (1) according to Claim 1, wherein the insulating protective element (9) has an access opening (11) which, in the assembly position, is oriented in relation to the assembly recess (10) in such a way that the assembly access point (M) to the internal conductor contact element (3) is cleared through the assembly recess (10) and the access opening (11).
3. Electrical plug-in connector (1) according to Claim 1 or 2, wherein an insulating part (12) is arranged between the internal conductor contact element (3) and the external conductor contact element (6), which insulating part has an assembly opening (13) which, together with the assembly recess (10) of the external conductor contact element (6), can provide the assembly access point (M).
4. Electrical plug-in connector (1) according to one of Claims 1 to 3, wherein the electrical plug-in connector (1) has a round geometry, wherein the external conductor contact element (6), the internal conductor contact element (3), the insulating part (12) and/or the insulating protective element (9) have a substantially round cross section.
5. Electrical plug-in connector (1) according to one of Claims 1 to 4, wherein the insulating protective element (9) is guided in a groove of the external conductor contact element (6), in a groove of the internal conductor contact element (3), in a groove of the insulating part (12), in a groove (14) which is formed between the insulating part (12) and the external conductor contact element (6) and/or in a groove which is formed between the insulating part (12) and the internal conductor contact element (3).
6. Electrical plug-in connector (1) according to one of Claims 1 to 5, wherein the assembly recess (10) of the external conductor contact element (6), the access opening (11) of the insulating protective element (9) and/or the assembly opening (13) of the insulating part (12) is designed as a bore or elongate hole.
7. Electrical plug-in connector (1) according to one of Claims 1 to 6, wherein the internal conductor (4) of the cable (2) is fastened to the internal conductor contact element (3) by means of a screw (5), wherein the assembly access point (M) runs in such a way that the screw (5) can be operated by inserting an assembly tool (15) into the assembly access point (M).
8. Electrical plug-in connector (1) according to Claim 7, wherein the screw (5) is completely covered by the insulating protective element (9) in the insulating protection position of the insulating protective element (9).
9. Electrical plug-in connector (1) according to Claim 7 or 8, wherein the diameter of a screw head of the screw (5) is larger than the diameter of the access opening (11) of the insulating protective element (9).
10. Electrical plug-in connector (1) according to one of Claims 1 to 9, wherein the insulating protective element (9) has latching means (17) for latching with a corresponding latching element (18) of the external conductor contact element (6), of the internal conductor contact element (3) and/or of the insulating part (12) in order to latch the insulating protective element (9) in the assembly position and/or in the insulating protection position.
11. Electrical plug-in connector (1) according to one of Claims 1 to 10, wherein the insulating protective element (9) is of partially annular or annular design, wherein the insulating protective element (9) can be displaced rotationally and/or axially between the assembly position and the insulating protection position with respect to the longitudinal axis (L) of the electrical plug-in connector (1).
12. Electrical plug-in connector (1) according to one of Claims 1 to 11, wherein the insulating protective element (9) has at least one guide means (16), in particular a radially or axially protruding lug or a web in order to be able to displace the insulating protective element (9) in its assembled state within the external conductor contact element (6).
13. Electrical plug-in connector (1) according to one of Claims 1 to 12, wherein a plurality of internal conductor contact elements (3), preferably two internal conductor contact elements (3) or even more internal conductor contact elements (3), and a number of corresponding assembly recesses (10) and access openings (11) are provided.
14. Method for assembling an electrical plug-in connector (1) which has an internal conductor contact element (3), an external conductor contact element (6) and an insulating protective element (9) which is arranged between the external conductor contact element (6) and the internal conductor contact element (3), comprising at least the following method steps:

    a) displacing the insulating protective element (9) into an assembly position in which an assembly access point (M) to the internal conductor contact element (3) is cleared through an assembly recess (10) which is provided in the external conductor contact element (6);

    b) fastening the internal conductor contact element (3) to an internal conductor (4) of an electrical cable (2) through the cleared assembly access point (M); and

    c) displacing the insulating protective element (9) into an insulating protection position in which the assembly access point (M) to the internal conductor contact element (3) is blocked by the insulating protective element (9).

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