EP3073577B1 - Plug, plug connection and method for producing a plug - Google Patents

Description

The invention relates to a plug part, comprising a plug housing with a displaceable locking mechanism for locking the plug part with a plug connector part, wherein in the plug housing at least one contact part is housed. The invention also relates to a plug connection with such a plug part and a plug connector part. The invention further relates to a method for producing a plug part. The invention is particularly applicable to power connectors, in particular high current connectors, especially in vehicles, especially for electrical systems.

In plug-in connections of the type in question low plugging and pulling forces are desired in the unlocked state for easy plugging or unplugging of the plug connector part. However, then often a vibration resistance in the locked state is not sufficient or achievable only with a high design effort.

In vehicle connector part and plug connector part are usually added by hand to a plug connection. If the connector housings are not completely assembled, the electrical contact can be made, the tightness and vibration resistance However, the connector be impaired and lead to failures during operation. To ensure that the connector parts or at least their connector housings are properly assembled, latching housing locks are used, which acknowledge a correctly closed connector and prevent unwanted loosening of the connector. Such housing locks are also referred to as Connector Position Assurance (CPA) locks or connector location locks.

Connectors according to the preamble of claim 1 are for example from the DE 10 2012 020 767 A1 , of the DE 10 2009 049 439 A1 and the DE 10 2012 015 568 A1 known. The disadvantage of this is that these connectors can be adapted to different Einsteckkontaktgrößen only with great design effort.

It is an object of the present invention to overcome the disadvantages of the prior art, at least in part, and in particular to provide a possibility for a secure mating connector that is inexpensive to implement and / or low insertion and removal forces for insertion or removal of the male connector and a part can provide high vibration resistance in the locked state.

This object is achieved according to the features of the independent claims. Preferred embodiments are in particular the dependent claims.

The object is achieved by a plug part comprising a plug housing with a locking mechanism for locking the plug part with a plug connector part and at least one electrical part accommodated in the plug housing Contact part, wherein the locking mechanism comprises a first locking element and a second locking element which are in mutual engagement with each other at least in a direction of movement of the locking mechanism, wherein the contact part comprises a displaceable control element for setting a contact force on a plug-in contact part of the male connector part in response to a position of the control and the second locking element is in a positive engagement with the control element.

This plug part has the advantage that with a movement of the locking mechanism for locking or unlocking the plug connection, a locking or unlocking of the contact element is performed. In a first locking state, therefore, the lock for the mechanical connection of plug part and Steckergegenteil (which can also be referred to as "housing lock") are open and the exercisable by the contact part contact force low. As a result, the male part and the male joint part can be easily assembled. By locking the plug part and the plug connector part, the contact force exerted by the contact part on a plug-in contact inserted in it is also increased, so that a high vibration resistance is achieved. The user no longer needs to additionally lock the contact part. This plug part is structurally simple and inexpensive to implement.

The plug part therefore has in particular a housing ("plug housing") and at least one contact part accommodated therein. In particular, the male-male part has a housing ("plug mating housing") matching the plug housing and at least one contact mating part ("plug-in contact") accommodated therein. The plug-in counterpart part can be placed or inserted in particular on the front side of the plug part. The direction of movement of the locking mechanism corresponds in particular to a plug-in direction and / or a longitudinal direction of the plug part.

Each of the contact parts may be connected to a respective electrical line (eg welded). The at least electrical line may be rearward from the connector housing be led out. Also, each of the plug-in contacts may be connected to a respective electrical line (eg welded). The at least one electrical line may then be led out of the rear plug housing back. Alternatively, the contact part and / or the plug-in contact may be led out directly from the associated housing.

The locking element of the contact part is a locking bolt, which is displaceable against the housing of the contact part.

It is a further development that the contact part forms a sleeve-shaped main body or a sleeve-shaped housing, which forms a receiving space for the inserted in an insertion Einsteckrichtung inside, at least one inside of the sleeve-shaped base body fixed contact spring and in the sleeve-shaped body between a first end position and a second end position slidably executable control in the form of a locking bolt which is in sliding contact with the at least one contact spring, wherein the locking bolt depending on its position between the two end positions, the at least one contact spring in a different degree in the direction of the receiving space for the Einsteckkontakt suppressed.

It is an embodiment that a plurality of contact parts are fixedly accommodated in the connector housing and the second locking element is engaged with respective controls of the contact parts. This means that several parallel electrical current paths can be easily and safely connected to each other. The fixed accommodation can be implemented, for example, by latching. In addition, so the controls all contact parts are moved by means of a common second locking element, which allows a particularly simple structure.

It is still another embodiment that the locking mechanism is a CPA or a connector position assurance mechanism, so that it is displaceable against the connector housing only with the plug-in connector part inserted. As a result, latching of the plug part and the plug-in part can be reliably implemented and recognized, e.g. by a corresponding click sound as an acknowledgment.

It is a further embodiment that the first locking element and the second locking element are locked together. This provides the advantage that the first locking element and the second locking element (which have been manufactured separately) can first be independently secured to the connector housing, to then be firmly connected together at least in the direction of movement of the locking mechanism. This also allows a high flexibility in the positioning of the locking elements on the connector housing.

It is a further development that the first locking element is attached from the outside to the plug housing, in particular is locked, while the second locking element is housed in an interior of the plug housing. The connection of the two locking elements, for example, by a leading through the connector housing connection area (eg in the form of a connecting pin) can be made. The fixation of the second locking element at least in the direction of movement of the locking mechanism may be achieved, for example, by a fastening, in particular latching, on the first locking element.

It is yet another embodiment that the connector housing has a sleeve-like wall, which is accessible to the front side for at least one male contact. On the rear side, the plug housing may be accessible to the at least one contact part and possibly for at least one line connected to a respective contact part. In a further development, at least one holder for the at least one contact part, which is designed as a guide for the second locking element, is located in an inner space enclosed by the wall. This allows a particularly compact design.

It is also an embodiment that the second locking element has at least one locking receptacle for the first locking element, which is latched with a projecting through the connector housing connecting pin of the first locking element. Thus, a particularly simple latching connection can be achieved by pressing the second locking element onto the first locking element, even in the case of a second locking element already inserted into the connector housing.

It is also an embodiment that the plug part forms part of a high-current connector for vehicle applications, in particular for an electrical system of motor vehicles.

The object is also achieved by a plug connection, comprising a plug part as described above and a matching plug-in part. The connector can be designed analogously to the plug part and gives the same advantages.

It is an embodiment that the plug connector part has at least one plug-in contact and is plugged into the plug part, wherein the first locking element is displaceable from an initial position for locking the plug part with the plug opposite part, by means of the first locking element, the second locking element is correspondingly displaceable by means of the second Locking element, the at least one control element is displaced accordingly and by the displacement of the at least one control element, the at least one male contact in a respective contact part is lockable. As a result, both locking of the housing of these two parts as well as a locking of the contact parts can be achieved with assembled plug part and plug connector part by means of a movement process.

The first locking element is in particular displaceable from an initial position (for example a first end position) into a further (second) end position. However, the displacement path can be easily adjusted by the displacement path provided for the locking mechanism.

The object is further achieved by a method for producing a plug part, in which a first locking element is latched from the outside in a plug housing, a second locking element is inserted into the plug housing until it locks with the first locking element, at least one contact part with a displaceable control element is inserted into the connector housing and the second locking element is brought into engagement with the at least one control element.

The method can be designed analogously to the plug part and / or to the plug connection and gives the same advantages.

The above-described characteristics, features and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more clearly understood in connection with the following schematic description of an embodiment which will be described in detail in conjunction with the drawings.

• Fig.1 zeigt als Explosionsdarstellung in Schrägansicht Komponenten eines erfindungsgemäßen Steckerteils;
• Fig.2 zeigt in einer Schrägansicht ein Steckergehäuse mit einem damit zu verbindenden ersten Verriegelungselement des erfindungsgemäßen Steckerteils;
• Fig.3 zeigt das erste Verriegelungselement in Schrägansicht;
• Fig.4 zeigt in Schrägansicht das Steckergehäuse mit dem damit verbundenen ersten Verriegelungselement zusammen mit einem in das Steckergehäuse einzusetzenden zweiten Verriegelungselement;
• Fig.5 zeigt das zweite Verriegelungselement in Schrägansicht;
• Fig.6 zeigt in Schrägansicht das Steckergehäuse mit dem damit verbundenen ersten Verriegelungselement zusammen mit dem in das Steckergehäuse eingesetzten zweiten Verriegelungselement;
• Fig.7 zeigt in Schrägansicht das erste Verriegelungselement und das zweite Verriegelungselement in einer zu Fig.6 entsprechenden Anordnung;
• Fig.8 zeigt in Schrägansicht das Steckergehäuse mit den damit verbundenen beiden Verriegelungselementen zusammen mit zwei in das Steckergehäuse einzusetzenden Kontaktteilen sowie Leitungen;
• Fig.9 zeigt ein Kontaktteil in Schrägansicht;
• Fig.10 zeigt in einer Ansicht von schräg vorne das fertige Steckerteil;
• Fig.11 zeigt in Schrägansicht die beiden Verriegelungselemente mit den beiden damit in Eingriff stehenden Kontaktteilen;
• Fig.12 zeigt in einer Schrägansicht eine Steckverbindung mit dem erfindungsgemäßen Steckerteil und einem Steckergegenteil, die noch nicht miteinander verriegelt sind; und
• Fig.13 zeigt in einer anderen Schrägansicht die Steckverbindung mit dem erfindungsgemäßen Steckerteil und dem Steckergegenteil, die nun miteinander verriegelt sind.

Characterized in that the first locking element and the second locking element are in a form-locking engagement with each other in a direction of movement of the locking mechanism, they are jointly displaceable against the connector housing.

• Fig.1 shows as an exploded view in an oblique view components of a plug part according to the invention;
• Fig.2 shows in an oblique view a plug housing with a first locking element of the plug part according to the invention to be connected thereto;
• Figure 3 shows the first locking element in an oblique view;
• Figure 4 shows an oblique view of the connector housing with the first locking element connected thereto together with a second locking element to be inserted into the connector housing;
• Figure 5 shows the second locking element in an oblique view;
• Figure 6 shows an oblique view of the connector housing with the associated first locking element together with the second locking element inserted into the connector housing;
• Figure 7 shows in an oblique view, the first locking element and the second locking element in one Figure 6 appropriate arrangement;
• Figure 8 shows an oblique view of the connector housing with the associated two locking elements together with two to be used in the connector housing contact parts and lines;
• Figure 9 shows a contact part in an oblique view;
• Figure 10 shows in a view obliquely from the front the finished plug part;
• Figure 11 shows an oblique view of the two locking elements with the two contact parts engaged therewith;
• Figure 12 shows in an oblique view a plug connection with the plug part according to the invention and a plug connector part, which are not yet locked together; and
• Figure 13 shows in another oblique view the connector with the plug part according to the invention and the plug-in part, which are now locked together.

Fig.1 shows an exploded view in an oblique view components of a connector part 1, namely a connector housing 2 with a longitudinal axis L, a first locking element 3, a second locking element 4, two electrical contact parts 5 and two electrical leads 6. The two locking elements 3 and 4 form one along the longitudinal axis L displaceable against the plug housing 2 locking mechanism 3, 4. The longitudinal axis L thus corresponds here to a displacement axis or a direction of displacement of the locking mechanism 3, 4th

In each case a contact part 5 is electrically connected to a respective line 6, e.g. by means of a solder joint. The lines 6 each have an attachment cap 7, which can be latched to the connector housing 2.

The first locking element 3 is latching from behind into an outer guide region 8 of the plug housing 2 insertable, as indicated by the arrow P1. The second locking element 4 can be inserted in an insertion direction through an open front side V of the plug housing 2, as indicated by the arrow P2 oriented parallel to the longitudinal axis L. The electrical contact parts 5 and the end regions of the electrical lines 6 connected thereto can be inserted into a rear side R, as indicated by the arrows P3.

Fig.2 shows an exploded view in oblique view, the connector housing 2 with the first locking element 3. The first locking element 3, in a different perspective view in a unique position in Figure 3 is shown, has on the rear side a base region 9, on the front side, a connecting pin 10 goes off. The connecting pin 10 has an annular groove 11 at its front end region. The base region 9 may serve as a handling area for displacing the first locking element 3.

Extending parallel to the connecting pin 10, a guide and latching area 12 extends from the base area 9 to the front. The guiding and latching area 12 has a latching tab 13 and two guide rails 14 extending laterally parallel thereto. The guide rails 14 are inserted into guide slots 15 of the guide portion 8 of the plug housing 2, while the locking tab 13 is inserted into a central recess 16 of a locking counter-tab 17 of the guide portion 8. Without connection of the plug part 1 with a plug-in part 51 (see Fig. 12 or 13 However, the locking tab 13 can only be inserted so far until it engages with a transversely extending locking groove 18 in a transverse locking strut 19 of the locking counter-tab 17 and locked with the connector housing 2. The connecting pin 10 partially passes through a tubular passage portion 20 of the plug housing 2, in such a way that the annular groove 11 is located in the connector housing 2.

Figure 4 shows an oblique view of the connector housing 2 with the thus latched first locking element 3 together with the still on the front side into the connector housing 2 to be used second locking element. 4

The connector housing 2 has a sleeve-like wall 21, the front side for at least one male contact 55 (see Figure 12 ) and the rear side for the contact parts 5 and the lines 6 is accessible. In a covered by the wall 21 interior I is a support portion 22 for the contact parts 5, which is designed as a guide for the second locking element 4. The holding region 22 has two elongated, in particular tubular, receiving regions 23 for a respective contact element 5.

Figure 5 shows the second locking element 4 in an oblique view. It has a transverse bar 24 which has an engagement region in the form of a latching receptacle 25 in the center. Downwardly projecting support regions 26 are also provided on each side for support on the holding region 22 (in particular on a respective receiving region 23), which each have two guide regions 27 projecting downwards, for example. Each guide portion 27 has a slot 28 as an engaging hole. The guide regions 27 also engage in guide slots 29 of the support regions 22, in particular with corresponding guide lugs 30.

Figure 6 shows an oblique view of the connector housing 2 with the associated first locking element 3 together with the inserted into the connector housing 2 second locking element 4 in a locking position ("pre-locking") of the second locking element 4. In this pre-locking the second locking element 4 is already latched to the first locking element 3, but is not yet completely on the support portion 22 (in particular an upper side thereof), but is particularly raised in the region of the guide slots 29 thereof.

Figure 7 shows in an oblique view, the first locking element 3 and the second locking element 4 in one Figure 6 appropriate arrangement. The two locking elements 3 and 4 are locked together, so that they are generally displaceable together against the connector housing 2. For latching engages the latching receptacle 25 of the second locking element 4 latching in the annular groove 11 of the connecting pin 10 of the first locking element 3 a. The two locking elements 3 and 4 are thus like a one-piece element in the extension direction of the longitudinal axis L ("longitudinal direction") of the plug housing 2 movable.

Figure 8 shows in an oblique view, the connector housing 2 with the associated two locking elements 3, 4 together with two to be used in the connector housing 2 contact parts 5 and 6 lines. The contact parts 5 are with their open front 31 ahead in a respective rear tubular insert portion 32 of the wall 21 and further introduced into the respective receiving areas 23. Through front-side slots 33 in the receiving areas 23, a plug-in contact 55 can engage from the front side V into the contact parts 5 and thus produce an electrical connection.

For attachment of the contact parts 5, the attachment caps 7 each have two latching tabs 34, in which latching lugs 35 of the plug housing 2 can engage in a latching manner.

Figure 9 shows a contact part 5 in an oblique view. The contact part 5 has a sleeve-shaped base body 36 with the open front side 31 for insertion of a plug-in contact element in the insertion direction S and with an open rear side 37. Through the main body 36 is a transverse serving as a control locking bolt 38 is inserted, which is displaceable in the insertion direction S. For this purpose, the locking pin 38 is guided in longitudinal slots 39 of the base body 36, in such a way that its end portions 40 protrude from the base body 36. The locking bolt 38 can be gripped at these end portions 40. On an underside of the base body 36 is a band-shaped Kontaktierungslasche 41, which is held by the base body 36 positively and protrudes from the back of the main body 36. On an upper side of the main body 36, a spring element (not shown) is arranged on the inside, which is displaceable more or less in the direction of the contacting tab 41 as a function of a position or of a displacement path of the locking bolt 38. The end regions 40 of the locking bolt 38 can in particular be passed through the respective receiving regions 23 in order to facilitate handling, for example into the guide slots 29.

In the illustrated first end position of the locking bolt 38, the spring element assumes a position in which upon insertion of the plug contact element 55 (see Figure 12 ) in the insertion direction S or when pulling out the plug contact element 55 in the opposite direction no contact force ("zero contact") or only a small contact force of the spring element is applied to the plug contact element 55. This allows easy insertion and removal.

If the locking pin 38 is displaced from its first end position, that of the spring element on the increased Plug contact element 55 abandoned contact force. The locking bolt 38 can basically be moved to a second end position, in which he strikes at the other ends of the longitudinal slots 39, but it does not need. In the second end position, a contact force may be particularly high, since the inserted plug contact element 55 is then held with particularly high spring forces in a clamped fit between the spring element and the Kontaktierungslasche 41.

The base body 36 has on its upper side and on its lower side in each case a latching lug 42 which can be latched into matching recesses (not shown) in the receiving regions 23.

Immediately after insertion of the contact elements 5, the second locking element 4 is still in a position in which it is at least partially lifted from the top of the support portion 22.

Figure 10 shows in a view obliquely from the front of the finished plug part 1. The locking mechanism 3, 4 formed by the two locking elements 3 and 4 can not be moved in the longitudinal direction of the plug housing or against the insertion direction S, since locking strut 19 still in the locking groove 18th intervenes.

In this arrangement, the second locking member 4 has been pressed down on the support portion 22, as indicated by the arrow P4. Thereby, the guide portions 27 have been lowered, so that the end portions of the locking pins 38 are slid into a respective slot 28, as well as in Figure 11 shown in more detail.

As a result, a positive connection between the second connecting element 4 and the locking bolt 38 has been generated in the longitudinal direction. Thus, at e.g. manual movement of the first locking element 3 and the second locking element 4 and the locking bolt 38 are moved in a substantially same amount in the longitudinal direction.

The latching of the two locking elements 3 and 4 with each other via annular groove 11 and latching receptacle 25 may in principle have already been carried out prior to the depression of the second locking element 4 or be carried out with the depression of the second locking element 4.

Figure 12 shows in an oblique view a connector V with the plug part 1 and a plug-in part 51, which, although mated, but not yet locked together.

The second plug part or plug-in part 51 of the connector V has a pull-on or cap housing 52 as a plug mating housing, which can be pushed over the front of the plug part 1 on this. The cap housing 52 has an elongated recess 53 for receiving the guide region 8 of the plug housing 2, which has a transverse strut 54 towards the plug part 1 towards the end.

The plug-in connector part 51 also has two band-shaped plug-in contacts 55 guided through the cap housing 52, which are inserted through the front side 31 into the contact parts 5.

When the plug-in connector part 51 is inserted, the locking strut 19 of the plug housing 2 is made of the latching groove 18 of the latching tab 13 of the first locking element 3 has been lifted out and thus taken. Thus, the first locking element 3 can now be moved forward in the direction of the plug-in part 51, for example, by manually pressing the base region. 9

Figure 13 shows in another oblique view the connector V, 51, in which the plug part 1 and the plug-in part 51 are now locked together.

By pressing the first locking element 3, this has been brought to the locking strut 19 behind the cross member 54 and thus locked in the recess 53. This happens with a clearly audible noise.

The locking mechanism 3, 4 corresponds to a connector position assurance mechanism or CPA (Connector Position Assurance) mechanism. In particular, the first locking element 3 may be a CPA locking element which produces a latching connection between the plug housing 2 and the cap housing 52.

By pressing the first locking element 3 further, the second locking element 4 and thus the locking pin 38 have been moved forward to its second end position, so that the Einsteckkontakte 55 are held firmly in the contact parts 5 and locked it.

The connector V may here e.g. be designed as a high current connector for vehicle applications, e.g. as a high-current connector in a vehicle electrical system.

Of course, the present invention is not limited to the embodiment shown.

Generally, "on", "an", etc. may be taken to mean a singular or a plurality, in particular in the sense of "at least one" or "one or more" etc., unless this is explicitly excluded, e.g. by the expression "exactly one", etc.

Also, a number may include exactly the specified number as well as a usual tolerance range, as long as this is not explicitly excluded.

LIST OF REFERENCE NUMBERS

1

plug part

2

plug housing

3

First locking element

4

Second locking element

5

contact part

6

management

7

crown cap

8th

guide region

9

base region

10

connecting pin

11

ring groove

12

Guiding and resting area

13

snap tab

14

guide rail

15

guide slot

16

recess

17

Rest mating link

18

locking groove

19

Rest strut

20

Through region

21

wall

22

holding area

23

reception area

24

crossbeam

25

latching receptacle

26

support area

27

guide region

28

slot

29

guide slot

30

guide nose

31

front

32

application

33

slot

34

snap tab

35

locking lug

36

sleeve-shaped body

37

back

38

locking bolt

39

longitudinal slot

40

end

41

contacting tab

42

snap tab

51

Plug-inverse

52

Union housing

53

recess

54

crossmember

55

insertion contact

I

inner space

L

longitudinal axis

P1

arrow

P2

arrow

P3

arrow

R

back

S

insertion

V

front

Claims (12)

1. Plug part (1), having

   - a plug housing (2) with a locking mechanism (3, 4) for locking the plug part (1) to a plug mating part (51), and

   - at least one contact part (5) which is accommodated in the plug housing (2), wherein

   - the locking mechanism (3, 4) has a first locking element (3) and a second locking element (4) which engage with one another in an interlocking manner at least in a movement direction of the locking mechanism (3, 4),

   - the contact part (2) has a movable control element (38) for adjusting a contact force on an insertion contact (55) of the plug mating part (51), which insertion contact can be inserted into the contact part (5), depending on a position of the control element (38), and

   - the second locking element (4) engages in an interlocking manner with the control element (38), characterized

   in that the control element (38) is a locking bolt.
2. Plug part (1) according to Claim 1, in which a plurality of contact parts (5) are fixedly accommodated in the plug housing (2), and the second locking element (4) engages with respective locking bolts (38) of the contact parts (5).
3. Plug part according to either of the preceding claims, in which the locking mechanism (3, 4) is a connector position securing mechanism, so that it can be moved towards the plug housing (2) only when the plug mating part (51) is inserted.
4. Plug part (1) according to one of the preceding claims, in which the first locking element (3) and the second locking element (4) are latched to one another.
5. Plug part (1) according to Claim 4, in which the second locking element has at least one latching receptacle (25) for the first locking element, which latching receptacle is latched to a connecting pin (10) of the first locking element (4), which connecting pin protrudes through the plug housing.
6. Plug part (1) according to one of the preceding claims, in which

   - the plug housing (2) has a sleeve-like wall (21) which is accessible at the front side (V) to at least one insertion contact (55), and

   - at least one holder (22) for the at least one contact part (5) is located in an interior space (I) which is encased by the wall (21), the said contact part being designed as a guide for the second locking element (4).
7. Plug part (1) according to Claim 6, in which

   - the at least one holder (22) has at least one tubular cutout region (23) for a respective contact element (5), and

   - the second locking element (4) has at least one engagement region (28) for each locking bolt (38).
8. Plug part (1) according to one of the preceding claims, in which the contact part (5) has a sleeve-like main body (36), which on the inside forms a receiving space for the insertion contact (55) which is to be introduced in an introduction direction (S), and at least one contact spring (41) which is fastened to the inside of the sleeve-like main body (36), and the locking bolt (38) is guided in a movable manner on the main body (36) between a first end position and a second end position in such a way that it is in sliding contact with the at least one contact spring (41).
9. Plug part (1) according to Claim 8, wherein the locking bolt (38) pushes the at least one contact spring to a different extent in the direction of the receiving space for the insertion contact depending on its position between the two end positions.
10. Plug part (1) according to Claim 8 or 9, wherein end regions (40) of the locking bolt project out of the main body (36).
11. Plug-in connection (V), having

    - a plug part (1) according to one of the preceding claims, and

    - a plug mating part (51) with at least one insertion contact (5), which plug mating part (51) is inserted into the plug part (1),

    wherein

    - the first locking element (3) can be moved out of a starting position for the purpose of locking the plug part (1) to the plug mating part (51),

    - the second locking element (4) can be correspondingly moved by means of the first locking element (3),

    - the at least one locking bolt (38) can be correspondingly moved by means of the second locking element (4), and

    - the at least one insertion contact (55) can be locked in a respective contact part (5) by moving the at least one locking bolt (38).
12. Method for producing a plug part (1) according to one of the preceding claims, in which method

    - a first locking element (3) is latched in a plug housing (2) from the outside,

    - a second locking element (4) is inserted into the plug housing (2) until it latches with the first locking element (3),

    - at least one contact part (5) with a movable locking bolt (38) is inserted into the plug housing (2), and

    - the second locking element (4) is brought into engagement with the at least one locking bolt (38).

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