Method for coupling plug connectors to form a plug assembly and plug assembly

Abstract

The invention relates to a method for coupling plug connectors (2, 3) to form a plug assembly (1) and a plug assembly (1) designed for this purpose. A first and a second plug connector (2, 3), a sealing element (4) and a locking element (5) are provided. The locking element (5) is arranged in a coupling gap (9, 10) of the first plug connector (2) such that a base leg (19) of the locking element (5) is arranged in a first position in its middle between the two legs (17, 18) of the locking element at a first radial distance (24) from a first longitudinal axis (8). When the second plug-in connector (3) is pushed into the first plug-in connector (2), the leg connecting sections (22-1, 22-2) first bear on the insertion tube (13) and then the second leg sections (21-1, 21-2) bear on the expansion section (14), and the base leg (19) is arranged in a second position at a larger second radial distance (25) from the longitudinal axis (8, 12).

Description

Technical Field

[0001] The invention relates to a method for coupling plug connectors to form a plug assembly and to a plug assembly which is designed to connect lines for liquid and / or gaseous media. Background Art

[0002] DE 10 2008 046 143 A1 describes a similarly designed quick-connect assembly for fluid-conducting connection of a fluid line device, a connecting pipe, a coupling releasably connected to the connecting pipe, and a sealing device arranged between the connecting pipe and the coupling. The spring device is in a releasable, form-locking engagement with the coupling. The bow-shaped spring device holds the bow ring axially on the coupling. The legs of the spring device extend tangentially through the female receiving space. To establish the coupled position, the connecting pipe can be pushed into the female receiving space of the coupling and locked into engagement with the legs of the spring device. A disadvantage of this is that, when the connecting pipe is pushed into the coupling, a high axial force is applied to expand the legs of the spring device.

[0003] EP2602531A1 describes a locking mechanism, a connecting device equipped with the locking mechanism, and a locking method for such a connecting device. The locking mechanism is designed to be used to equip a lockable connecting device for fluid transportation. The connecting device includes a male tubular sleeve with a flange and a female tubular sleeve surrounded by a coupling ring and extended axially. The locking mechanism has two elastic locking wings, which are connected between them by means of a gripping head. The locking wings can be inserted into gaps formed on both sides in a tangential direction. Additional locking sleeves are arranged radially relative to each other on the two locking wings. After the male sleeve is fully inserted into the female sleeve, the locking sleeves form a locked position with the male tubular sleeve. When the male sleeve is pushed in, the two locking wings expand in the radial direction to guide them onto the end piece of the male sleeve. After being fully pressed in, the locking wings are locked behind the flange with their locking sleeves and thus form a locked position.

[0004] WO2018 / 069384A1 describes a connector, a connector assembly, and a method for manufacturing the connector. The connector includes a connector housing having a fluid channel extending away from a first opening, wherein a locking device with a locking housing and a locking element is provided in the region of the first opening. The locking housing surrounds the connector housing in a circumferential direction with respect to the fluid channel, so that an annular gap concentrically surrounding the first opening is formed between the connector housing and the locking housing for accommodating a substantially cylindrical connecting pipe. The locking element elastically extends into the annular gap with its retaining section, wherein the locking housing is a component separate from the connector housing. The locking element is a clamp that at least partially surrounds the locking housing in a circumferential direction and extends into the annular gap from the radial outside with its retaining section. The clamp is located in a groove extending in the circumferential direction and is securely retained in the groove. Here, the retaining section of the clamp also expands in the radial direction when pushed in and coupled together.

[0005] EP3244113A1 also describes a locking clamp for a connecting pipe of a quick connection system. The connecting pipe has a first receiving slot group with a first receiving slot and a second receiving slot group with a second receiving slot along its periphery. The locking clamp itself has an at least partially surrounding first clamp section with a first projection group, the first projection group having radially inwardly directed first projections, the first projections being configured to engage with the first receiving slots of the first receiving slot group of the connecting pipe. In addition, the locking clamp includes an at least partially surrounding second clamp section with a second projection group, the second projection group also having radially inwardly directed second projections, the second projections being configured to engage with the second receiving slots of the second receiving slot group of the connecting pipe. A bent spring section can connect the first clamp section and the second clamp section to each other to form a common component, wherein the bent spring section is arranged at an angle to the first and second projections. However, the two clamp sections can each constitute a separate component. The first and second projection groups of the locking clip or of its own clip section respectively form locking elements for coupling the connecting piece to the mating connecting piece that can be inserted therein. During the coupling process, the individual projection groups of the locking clip also expand in the radial direction during insertion. When the locking clip expands radially by inserting the mating connecting piece into the connecting piece, the curved spring section bends upward and thereby expands.

[0006] EP 2 372 209 A2 describes an exhaust line for a motor vehicle and an exhaust system for a motor vehicle. A first end section and a second end section of the exhaust line are connected to each other in an airtight manner. The first end section has an insertion area that is inserted into a receiving area of ​​the second end section. The insertion area has a latching projection with a latching side and a start side that is inclined relative to the axis of rotation, wherein the latching mechanism abuts against the latching side in the coupled position. The latching mechanism is designed as a spring clip that is guided in a gap in the receiving area. The spring clip is U-shaped, and each leg of the spring clip has an outwardly curved section whose inner radius corresponds to the outer radius of the insertion area. This allows for a relatively large contact surface for the legs on the latching projection. The U-shaped legs of the spring clip also expand in the radial direction when inserted and coupled together, and the connecting web between the two legs deforms. Summary of the Invention

[0007] The object of the present invention is to overcome the disadvantages of the prior art and to provide a method for coupling plug connectors and a plug assembly with which the user can carry out a simple and labor-saving coupling process of the plug connector and engagement with a locking element.

[0008] This object is achieved by the method and the plug-in assembly according to the invention.

[0009] The method provided is used to couple plug connectors to form a plug assembly, which is designed to connect lines for liquid and / or gaseous media. In this method, the following steps are carried out:

[0010] - providing a first female plug connector having a first plug connector body of tubular design, which defines a female receiving space with a first longitudinal axis, wherein at least a first coupling slot and a second coupling slot are arranged radially opposite one another in the first plug connector body,

[0011] - providing a second male plug connector having a second plug connector body of tubular configuration, the second plug connector body having:

[0012] - hollow cylindrical inserts,

[0013] a conically widening expansion section adjoining the insertion nozzle, and

[0014] a coupling section connected to the expansion section and having at least one coupling groove, wherein a second longitudinal axis is defined by the second plug connector body,

[0015] - providing at least one sealing element and arranging said sealing element in the female first plug connector,

[0016] - providing a locking element which is of arcuate design and which is in releasable form-fitting engagement with the two plug connectors when the plug connectors are in the coupled position, the locking element comprising:

[0017] ——The first leg,

[0018] - the second leg, and

[0019] - a base leg, which connects the two legs to each other, and each of the two legs comprises:

[0020] - first outrigger section,

[0021] - the second leg section, and

[0022] a leg connecting section, which connects the first leg section and the second leg section to one another, and the first leg section is arranged to be connected to the base leg on sides facing away from one another, wherein in the undeformed initial position at least the two second leg sections are oriented so as to extend parallel to one another, and furthermore the two leg connecting sections are oriented towards one another in the direction toward the base leg,

[0023] the locking element is arranged in the two coupling slots of the first plug connector body, and the base leg of the locking element is arranged in a first position in its middle part between the two legs at a first radial distance from the first longitudinal axis,

[0024] the longitudinal axes of the two plug connectors are oriented relative to one another, preferably aligned,

[0025] - moving the two plug connectors toward each other and gradually inserting the second plug connector into the female receiving space of the first plug connector,

[0026] (a) inserting the hollow cylindrical insertion nozzle, wherein the two leg connecting sections are each arranged in a partial section directly adjacent to the hollow cylindrical insertion nozzle or resting on the hollow cylindrical insertion nozzle at the first contact section,

[0027] (b) the insertion process is continued in the axial direction, wherein the two second leg sections are supported on the conically widening expansion section, each resting on a further contact section, and wherein the base leg of the locking element is arranged in a second position in its center between the two leg sections at a second radial distance from the longitudinal axis, and wherein the second radial distance has a greater value than the first radial distance,

[0028] (c) The insertion process is continued further in the axial direction, wherein the locking element engages with its second leg section of the first leg in the first coupling gap and the coupling groove when the first and second plug connectors are in the coupled position with each other, and the second leg engages with its second leg section in the second coupling gap and the coupling groove.

[0029] The method steps selected here are advantageous in that, by providing a leg connecting section between the first and second leg sections and shifting the bearing point, bearing section, or contact section from the two leg connecting sections to the second leg section, which is spaced apart from the base leg, the free bending length of the leg is increased and, therefore, the insertion force (axial force) required is reduced. By shifting the contact point or contact section along the legs of the locking element during the joining or insertion process and, in conjunction with this, increasing the transverse or radial distance between the base leg and the longitudinal axis, the force required to spread the legs apart is reduced and, therefore, the insertion force (axial force) required is also reduced. This is achieved by extending the two levers or lever arms on the respective legs of the locking element.

[0030] Furthermore, a method is advantageous in which, when the coupling position is reached, the locking element is adjusted back with its base leg into the first position. Thus, the locking element is again displaced with its base leg closer in the direction of the longitudinal axis, thereby reducing the bending length of the leg and increasing the holding force.

[0031] Another advantageous operating method is characterized in that, during step (a) of the axial insertion of the second plug connector into the female receiving space of the first plug connector, the two second leg sections are each radially spaced apart from the hollow cylindrical insertion nozzle. This allows the two leg connecting sections to be clearly positioned and supported against the insertion nozzle during the axial adjustment movement. Only when the outwardly widened flared section is reached can the contact section between the locking element and the second plug connector body be displaced and initiated.

[0032] A method variant is also advantageous in which, after step (b) has begun, the two leg connecting sections are lifted from the conically widening expansion section. This ensures that the contact point or contact section can be fixed and defined without problems. Furthermore, the frictional forces that occur can also be kept low.

[0033] Another operating method is characterized in that, during step (b) of the axial insertion process, the radial distance between the center of the base legs is continuously increased from a first radial distance value to a second radial distance value. This allows for a continuous increase in the free bending length. The wider the two legs are spread, the greater the free bending length, and the insertion force can be kept within minimal limits.

[0034] Furthermore, a configuration is advantageous in which the two leg connecting sections of the locking element are each arranged or accommodated over a substantial portion of their length in the coupling groove when the plug connector is in the coupled position. This allows for better fixation and a higher form fit of the legs of the locking element in the locked position.

[0035] Another advantageous operating mode is characterized in that the basic legs of the locking element, in particular its middle section, are at least supported against the first plug connector in the coupled position. Therefore, a more clear positional positioning of the locking element on the first plug connector can be provided.

[0036] A method variant is also advantageous in which the value of the second radial distance of the base leg from the longitudinal axis is at a maximum after leaving the widened section of the two legs and before the two second leg sections are each introduced into the coupling groove. Thus, even at maximum radial expansion of the two legs, a maximum extension of the free bending length of each leg can be achieved.

[0037] However, the object of the invention is also achieved independently of this by a plug-in assembly according to the features given below.

[0038] The plug assembly is designed for connecting lines for liquid and / or gaseous media and comprises:

[0039] a first female plug-in connector having a first plug-in connector body of tubular design, which defines a female receiving space with a first longitudinal axis, wherein at least a first coupling slot and a second coupling slot are arranged radially opposite one another in the first plug-in connector body,

[0040] a second male plug connector having a second plug connector body of tubular design, which has:

[0041] - hollow cylindrical inserts,

[0042] - a conically widening expansion section adjoining the insertion nozzle, and

[0043] a coupling section connected to the expansion section and having at least one coupling groove, wherein the second plug connector body defines a second longitudinal axis,

[0044] wherein the two plug connectors can be brought into a releasable coupling position in the axial direction,

[0045] at least one sealing element, which is arranged in the first female plug connector,

[0046] a locking element, which is of arcuate design and, in the coupled position, is in a releasable form-fitting engagement with the two plug connectors, comprising:

[0047] ——The first leg,

[0048] - the second leg, and

[0049] - a base leg, which connects the two legs to each other, and each of the two legs comprises:

[0050] - first outrigger section,

[0051] - the second leg section, and

[0052] a leg connecting section, which connects the first leg section and the second leg section to one another, and the first leg sections are arranged on sides of a base leg facing away from one another so as to be connected to the base leg, wherein in an undeformed initial position at least the two second leg sections are oriented so as to extend parallel to one another, and furthermore the two leg connecting sections are oriented so as to approach one another towards the base leg,

[0053] wherein the locking element engages with its first leg in the first coupling slot and the coupling groove when the first and second plug connectors are in the coupled position, and the second leg engages with the second coupling slot and the coupling groove, and

[0054] - wherein the base leg of the locking element is arranged in a first position at a first radial distance from the first longitudinal axis in its central part between the two leg sections at least in the coupled position, and wherein it is further provided that

[0055] at the start of the axial insertion of the second plug-in connector into the female receiving space of the first plug-in connector, the two leg connecting sections are each arranged in a subsection directly adjacent to the hollow cylindrical plug-in connector or lying against the first contact section on the hollow cylindrical plug-in connector,

[0056] During further insertion in the axial direction, the two second leg sections are supported on the conically widening expansion section, each resting against a further contact section.

[0057] at least in the position of the second leg section resting against the conically widening expansion section, the base leg of the locking element is arranged in a second position in its center between the two legs at a second radial distance from the longitudinal axis, and

[0058] - said second radial distance has a greater value than the first radial distance.

[0059] The advantage achieved thereby is that by providing a leg connecting section between the first and second leg sections and shifting the bearing point, bearing section, or contact section from the two leg connecting sections to the second leg section, which is spaced apart from the base leg, the free bending length of the leg is increased, and thus the insertion force (axial force) required is reduced. By shifting the contact point or contact section along the legs of the locking element during the joining or insertion process and thereby increasing the transverse or radial distance between the base leg and the longitudinal axis, the force required to spread the legs apart is reduced, and thus the insertion force (axial force) required is also reduced. This is achieved by extending the two levers or lever arms on the respective legs of the locking element.

[0060] In addition, it can be advantageous that when the locking element is in the coupled position, the base leg is adjusted back into its first position. Therefore, the locking element is displaced closer to the longitudinal axis with its base leg again, thereby reducing the bending length of the leg and improving the holding force.

[0061] Another embodiment is characterized in that, at the beginning of the axial insertion of the second plug connector into the female receiving space of the first plug connector, the two second leg sections are each radially spaced apart from the hollow cylindrical insertion nozzle. This allows the two leg connecting sections to rest positively on and support the insertion nozzle during the axial adjustment movement. Only when the outwardly widened flared section is reached can the contact section between the locking element and the second plug connector body be displaced and initiated.

[0062] Another possible embodiment is characterized in that, when the two second leg sections are supported on the conically widening expansion section, the two leg connecting sections are arranged spaced apart from the conically widening expansion section. This ensures that the contact point or contact section can be fixed and defined without any problems. Furthermore, any frictional forces that occur can be kept low.

[0063] Another embodiment provides that the two leg connecting sections of the locking element are each arranged or accommodated with a majority of their length in the coupling groove when the plug connector is in the coupled position. This allows for better fixation and a higher form fit in the locked position of the legs of the locking element.

[0064] Another advantageous embodiment is characterized in that the basic legs of the locking element, in particular its middle section, are supported against the first plug connector at least in the coupled position. Therefore, a more clear positional positioning of the locking element on the first plug connector can be achieved.

[0065] Another preferred embodiment is characterized in that the value of the second radial distance of the base leg has a maximum value before the two second leg sections are introduced into the coupling groove. Therefore, when the two legs are expanded radially to the maximum, the maximum extension of the free bending length of each leg can also be achieved.

[0066] Furthermore, it can be advantageous if the base leg, starting from its center between the two legs, has a roof-shaped, angled longitudinal direction towards the two legs, thereby enabling a better adaptation to the outer geometry of the first plug connector.

[0067] Another alternative embodiment is characterized in that the two first leg sections are oriented parallel to one another in the undeformed initial position of the locking element. This allows for better positional fixation of the locking element when the base leg is in the first position. Furthermore, this also allows for adequate lateral guidance of the locking element during the axial insertion or insertion movement and the associated lateral adjustment of the entire locking element.

[0068] Another possible and possibly alternative embodiment is characterized in that the base leg, each first leg section, each leg connecting section, and each second leg section are arranged so as to extend in a common plane. This allows for a narrow design of the coupling gap and the coupling groove, but also allows for good guidance of the locking element at least in the coupling gap.

[0069] Another embodiment provides that a supporting leg is provided on each second leg section at its end facing away from the base leg, and that the supporting legs each have a longitudinal orientation that is oriented in the direction of a normal to the common plane. This allows the two ends of the legs to be better guided on their outer surfaces during relative displacement of the first plug connector.

[0070] Another embodiment is characterized in that the two support legs are supported on the first plug connector body between the first position of the base leg and the second position of the base leg and in opposing abutment. Depending on the orientation and configuration of the respective abutment surfaces, it is possible to forcibly adjust the locking element from the second position of the base leg back into its first, close position. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] For a better understanding of the present invention, the present invention will be explained in detail with reference to the following drawings.

[0072] They are shown in extremely simplified schematic diagrams:

[0073] Figure 1 A diagrammatic illustration shows the plug-in assembly with its two plug-in connectors and a locking element in a position in which the individual components are still separated from one another;

[0074] Figure 2 The enlarged diagram shows the Figure 1 Locking element;

[0075] Figure 3 The view opposite to the insertion direction of the second plug connector shows the connection of the legs at the beginning of the insertion process according to the following example, when the legs connecting section is arranged directly adjacent to or rests against the plug-in socket of the second plug connector. Figure 1 and 2 Cross-section of the plug-in assembly;

[0076] Figure 4 A further cross section of the plug-in assembly is shown in a view opposite to the insertion direction of the second plug-in connector, but with the second leg section resting on the enlarged expansion section of the second plug-in connector;

[0077] Figure 5 shows another cross section of the plug assembly, but with the locking element in the locking position in the coupling groove of the second plug connector;

[0078] Figure 6 The details of the support of the end section of the leg on the outside or outer surface of the first plug connector are shown in an axial view and an enlarged illustration. DETAILED DESCRIPTION

[0079] Initially, it should be noted that identical components in the various described embodiments are provided with identical reference numerals or identical component names, wherein the disclosure contained throughout the entire description can be transferred to identical components with identical reference numerals or identical component names without prejudice to the preceding text. Positional expressions selected in the description, such as upper, lower, lateral, etc., also relate to the present description and the illustrated figures and can be transferred to the new position in the event of a change in position.

[0080] The term “in particular” is to be understood below as meaning that this may relate to a possible more specific configuration or a detailed description of an object or a method step, but does not necessarily mean a mandatory preferred embodiment or a mandatory mode of operation of said object or method step.

[0081] In their present usage, the terms "comprises," "has," "having," "includes," "including," "includes," "includes" and any other variations thereof, are intended to cover a non-exclusive inclusion.

[0082] exist Figures 1 to 6 Components and component parts for forming a plug assembly 1 are shown and described, wherein the plug assembly 1 is designed to connect lines for liquid and / or gaseous media. In the following, not only the individual components and component parts are shown, but also a method for coupling them to each other is described.

[0083] The plug assembly 1 comprises a first female plug connector 2, a second male plug connector 3, a sealing element 4 and at least one locking element 5. For greater clarity, the connecting lines are not shown and described in detail on both sides of the plug connectors 2, 3.

[0084] The first plug connector 2 has a first plug connector body 6 of tubular design, which defines a female receiving space 7 having a first longitudinal axis 8. In a known manner, a first coupling slot 9 and a second coupling slot 10 are arranged radially opposite one another in the first plug connector body 6. The two coupling slots 9, 10 are designed or configured to receive and retain the locking element 5 in a guided arrangement.

[0085] The second plug-in connector 3 itself has a second plug-in connector body 11, which is also tubular and defines a second longitudinal axis 12. The second plug-in connector body 11 includes a hollow cylindrical insertion tube 13, a truncated cone or conically enlarged expansion section 14 connected to the insertion tube, and a coupling section 15 connected to the expansion section. The previously described components are arranged one after the other, viewed opposite to the insertion direction. The coupling section 15 is mostly hollow cylindrical and has at least one coupling groove 16. Depending on the arrangement and configuration of the coupling section 15, the coupling groove 16 can be constructed continuously around the circumference. However, it is also possible to provide a coupling groove 16 in each case, radially opposite to each other, similar to the two coupling gaps 9 and 10. In this case, the first coupling groove is indicated by the reference numeral 16-1, and the second coupling groove is indicated by the reference numeral 16-2. The at least one coupling groove 16 is also used in a known manner to be placed in or in a releasable positive engagement with the locking element 5 when the plug connectors 2, 3 are in the joined, coupled position. If, as shown in the present embodiment, an additional torsion lock with cooperating first and second locking elements is provided, the coupling groove 16 can be designed to be interrupted.

[0086] The plug-in socket 13 forms, at least in regions, a sealing surface for cooperating with a sealing element accommodated in the first plug-in connector 2 when the plug-in connectors 2 , 3 are in the coupled position.

[0087] The locking element 5 is generally or preferably made of a metal material with spring properties. It is preferably formed from a shaped round wire. The basic shape of the locking element 5 is chosen to be arcuate, with the locking element 5 comprising a first leg 17, a second leg 18, and a base leg 19 connecting the two legs 17, 18 to one another. The locking element 5 is designed to be mirrored relative to a center plane (M). In the assembled position of the locking element 5 on the first plug connector 2, the center plane (M) extends along the first longitudinal axis 8. The two legs 17, 18 are arranged laterally spaced apart from the center plane (M). The base leg 19 can have a roof-shaped, curved longitudinal direction, starting from the center plane (M) between the two legs 17, 18 and extending toward the two legs 17, 18.

[0088] Each of the legs 17, 18 has essentially the same components, for which reason the same reference numerals are also used on both sides of the center plane (M), but with the addition of "-1" or "-2". Thus, each of the legs 17, 18 comprises a first leg section 20-1, 20-2, a second leg section 21-1, 21-2, and a leg connecting section 22-1, 22-2, which connects the respective leg sections 20-1, 21-1 and 20-2, 21-2 to one another.

[0089] The first leg sections 20-1, 20-2 are arranged on the base leg 19 on sides or ends facing away from each other, connected to the base leg. In the undeformed initial position of the locking element 5, at least the two second side leg sections 21-1, 21-2 are oriented substantially parallel to each other or, within certain limits, parallel to each other. The two leg connecting sections 22-1, 22-2 are oriented toward each other, facing the base leg 19. The two second leg sections 21-1, 21-2 are arranged at a greater distance from each other in the normal direction to the center plane (M) than the first leg sections 20-1, 20-2. As can be seen, the two first leg sections 20-1, 20-2 can also be oriented parallel to each other in the undeformed initial position of the locking element 5.

[0090] The base leg 19, each first leg section 20-1, 20-2, each leg connecting section 22-1, 22-2 and also each second leg section 21-1, 21-2 can also be arranged so as to extend in a common plane (E). In addition, a separate supporting leg 23-1, 23-2 can be arranged on each of the second leg sections 20-1, 20-2 as a component of the locking element 5. The supporting legs 23-1, 23-2 are each arranged on the end of the second leg section 21-1, 21-2 facing away from the base leg 19, wherein the supporting legs 23-1, 23-2 each have a longitudinal orientation that is oriented in the direction of the normal to the common plane (E). As shown by Figure 2 It can be seen that the plane (E) forms a normal plane with respect to the longitudinal axes 8 , 12 , wherein the center plane (M) is arranged extending in the longitudinal axes 8 , 12 and thus forms a normal plane with respect to the plane (E).

[0091] The supporting legs 23-1, 23-2 can be used or designed so that they are supported between a first position of the base leg 19 and a second position of the base leg 19 and in opposite contact on the first plug connector body 6. These two positions will be described in detail below.

[0092] If the two plug connectors 2, 3 are in their coupled position, the locking element 5 engages with its first leg 17 in the first coupling slot 9 and in the coupling groove 16. However, at the same time, the second leg 18 also engages in the second coupling slot 10 and also in the coupling groove 16.

[0093] Before the two plug connectors 2, 3 are joined and pushed into each other, the locking element 5 is inserted with its two legs 17, 18 into the coupling slots 9, 10 provided for this purpose in the first plug connector body 6 and held in position therein. Here, the base leg 19 of the locking element 5 is arranged in its center between the two legs 17, 18 at a first radial distance 24 from the first longitudinal axis 8 in a first position, as best described by Figure 1 and Figure 3 In the undeformed and pre-assembled initial position of the locking element 5 on the first plug connector 2 with its coupling slots 9 , 10 , at least sections of the second leg sections 21 - 1 , 21 - 2 and of the leg connecting sections 22 - 1 , 22 - 2 extend from the two coupling slots 9 , 10 into the female receiving space 7 .

[0094] In order to bring the two plug connectors 2, 3 into their coupled position, the two longitudinal axes 8, 12 of the two plug connectors 2, 3 must now be aligned relative to one another, preferably aligned. The two plug connectors 2, 3 are then moved toward one another and the second plug connector 3 is gradually inserted into the female receiving space 7 of the first plug connector 2. This gradual insertion can be performed according to the steps described below.

[0095] In a first step (a), the hollow cylindrical insertion socket 13 is inserted into the female receiving space 7. In this case, at least one of the two leg connecting sections 22-1, 22-2 or the two leg connecting sections 22-1, 22-2 can be arranged in a manner abutting against the hollow cylindrical insertion socket 13 in a section thereof, see Figure 3 . Due to the current arrangement of the locking element 5 on the first plug connector 2, it is possible that in the first step (a), the two leg connecting sections 22-1, 22-2 are each arranged directly adjacent to the hollow cylindrical insertion tube 13 and just do not touch it. The abutment points or first contact sections are shown as circles on both sides. This is because the leg connecting sections 22-1, 22-2 also extend from the two coupling gaps 9, 10 into the female receiving space 7. The two leg connecting sections 22-1, 22-2 are arranged closer to the base leg 19 than the two second leg sections 21-1, 21-2.

[0096] In a further subsequent step (b), the insertion process is continued in the axial direction. In this process, the two second leg sections 21 - 1 , 21 - 2 are each supported against the conically widening expansion section 14 of the second plug connector body 11 , see Figure 4The contact points or second or further contact sections are also shown here as circles on both sides. When the two second leg sections 21 - 1 , 21 - 2 are supported on the conically widening expansion section 14 , the two leg connecting sections 22 - 1 , 22 - 2 can be arranged spaced apart or at a distance from the conically widening expansion section 14 .

[0097] Due to the alternating support from the leg connecting sections 22-1, 22-2 to the second leg sections 21-1, 21-2 and the abutting support on the expansion section 14, the base leg 19 of the locking element 5 is arranged in its center between the two legs 17, 18 in the second position at a second radial distance 25 from the longitudinal axes 8, 12. The second radial distance 25 has a greater value than the first radial distance 24. The first radial distance 24 mentioned above is shown as a dashed line for the base leg 19.

[0098] Transverse adjustment of the locking element 5 is achieved through an axial insertion or insertion movement and the interaction of the outwardly expanding flared section 14 with the different sections of the two legs 17 and 18. This eliminates the need for a separate manual adjustment movement of the locking element 5. The axial insertion movement, combined with the displacement of the leg connecting sections 22-1, 22-2, which extend in a curved manner relative to the second leg sections 21-1, 21-2, and the contact points or contact sections, converts a certain portion of the axial force into an adjustment force directed transversely relative to the second leg sections 21-1, 21-2. This adjustment force causes a relative displacement of the locking element 5 in the transverse or radial direction.

[0099] This achieves a greater retention distance of the base leg 19 from the longitudinal axes 8, 12. By lifting or raising the entire locking element 5 in the transverse direction, the lever or lever arm of each of the two legs 17, 18 is also extended from the corresponding support point or support section or contact section on the second plug connector body 11 to the transition area of ​​the corresponding leg 17, 18 to the base leg 19. By displacing the corresponding first contact section on the leg connecting section 22-1, 22-2 to a second or further contact section on the second leg section 21-1, 21-2, which is further spaced from the end of the base leg or relative to the transition section, the two levers or lever arms are extended, and the required insertion force (axial force) is thus reduced.

[0100] In a subsequent step (c) of the insertion process in the axial direction, the two plug connectors 2, 3 are brought into their predetermined mutual coupling position. The locking element 5, which has been expanded on both sides, reaches a covering position with its two legs 17, 18 relative to the coupling groove 16. When this position is reached, the second leg section 21-1 of the first leg 17 engages in the first coupling gap 9 and in the coupling groove 16, see also. Figure 5 The same applies to the second leg 18. Its second leg section 21-2 engages not only in the second coupling gap 10 but also in the coupling groove 16. The insertion and coupling process is thus carried out and completed. The previously expanded position of the two legs 17, 18 is eliminated again by snapping into the coupling groove 16. A certain residual prestressing of the two legs 17, 18 toward the longitudinal axes 8, 12 can be maintained.

[0101] When the locking position between the locking element 5 and the second plug connector 3 inserted into the first plug connector 2 is reached, the two plug connectors 2, 3 are also in their coupled position. In this case, the locking element 5 is adjusted back with its base leg 19 into the first position, in which the base leg 19 is arranged closer to the longitudinal axis 8, 12 than in its second position.

[0102] During the previously described step (a) of the axial insertion process of the second plug-in connector 3 into the female receiving space 7 of the first plug-in connector 2, the two second leg sections 21-1, 21-2 are each arranged radially spaced apart from the hollow cylindrical insertion socket 13. Furthermore, it is possible to lift the two leg connecting sections from the conically widening expansion section after the start of step (b). This is possible because the bearing point or bearing section is shifted from the leg connecting sections 22-1, 22-2 to the second leg sections 21-1, 21-2.

[0103] It is also possible that during step (b) of the axial insertion process, the radial distance between the centers of the base legs 19 increases continuously from the value of the first radial distance 24 to a second value of the second radial distance 25. The further the second plug connector 3 is inserted into the first plug connector 2, the further the two legs 17, 18, in particular their second leg sections 21-1, 21-2, slide along the contact surface of the enlarged expansion section 14. As a result of the expansion of the two legs 17, 18, the base legs 19 are further spaced from the longitudinal axes 8, 12.

[0104] If the two plug connectors 2, 3 are in their coupled position and the locking element 5 is also in locking engagement with its two legs 17, 18 in the coupling groove 16, the two leg connecting sections 22-1, 22-2 of the locking element 5 can also each be arranged or accommodated over a substantial portion of their length in the coupling groove 16. Furthermore, it can be advantageous if the base leg 19 of the locking element 5, in particular its middle section, is supported on the outside against the first plug connector 2 at least in the coupled position.

[0105] When the two legs 17 , 18 , in particular their second leg sections 21 - 1 , 21 - 2 , have passed the widened section 14 and before they are locked or snapped into the coupling groove 16 in the subsequent coupling section 15 , the second radial distance 25 of the base leg 19 from the longitudinal axes 8 , 12 is at a maximum value.

[0106] As already described and by Figure 6 As can be best seen, the two support legs 23 can always be supported in abutting contact on the first plug connector body 6 of the first plug connector 2, with their orientation approximately parallel to the longitudinal axes 8, 12. The guide surfaces 26 are oriented at an angle relative to one another, facing away from the base leg 19, to simplify or even assist the return movement of the locking element 5 from the second position of the base leg 19 to the first position closer to the first plug connector 2. Furthermore, but also by providing at least one stop element 27, the relative adjustment movement of the locking element 5, and thus the adjustment path, from the position of the base leg 19 closer to the longitudinal axes 8, 12 to the second position can be limited. The previously described first position of the locking element 5 with its base leg 19 is denoted by the Roman numeral "I" for the support leg 23-1 or the support leg 23-2, and by the Roman numeral "II" for the second position.

[0107] In order to release the two legs 17, 18 from the locking engagement with the coupling groove 16 by means of partial sections, the locking element 5 is manually displaced with its base leg 19 toward the longitudinal axes 8, 12. This adjustment movement allows the support legs 23-1, 23-2 to be displaced into the retaining recess 28. The two legs 17, 18 are thereby spaced apart and spread apart to such a degree that the second plug connector 3 can be pulled out of the first plug connector 2 counter to the insertion direction without colliding with the two legs 17, 18.

[0108] Finally, it should be mentioned that the individual method steps and their chronological sequence do not necessarily have to be carried out in the order described, but can also be carried out in a chronological sequence deviating therefrom.

[0109] These embodiments illustrate possible implementation variants, wherein it should be noted that the present invention is not limited to the particularly illustrated implementation variants of the invention, but different combinations of the individual implementation variants with one another are also possible and this possibility of variation is within the capabilities of a person skilled in the art based on the teachings of the technical means of the present invention.

[0110] The scope of protection is determined by the claims. However, the claims should be interpreted with reference to the description and the drawings. Individual features or combinations of features from the various exemplary embodiments shown and described can constitute independent inventive solutions. The tasks underlying the independent inventive solutions can be inferred from the description.

[0111] All descriptions of numerical ranges in this specification should be understood as including any and all partial ranges therein. For example, the description 1 to 10 should be understood as including all partial ranges starting from the lower limit 1 and the upper limit 10, that is, all partial ranges starting with a lower limit of 1 or greater and ending with an upper limit of 10 or less, for example 1 to 1.7 or 3.2 to 8.1 or 5.5 to 10.

[0112] Finally, for the sake of clarity, it should be noted that some elements are partially not shown to scale and / or are shown enlarged and / or reduced in size in order to provide a better understanding of the construction.

[0113] Reference Signs List

[0114] 1 plug-in assembly

[0115] 2 First plug connector

[0116] 3 Second plug connector

[0117] 4 Sealing elements

[0118] 5 locking elements

[0119] 6 First plug connector body

[0120] 7Accommodation space

[0121] 8First longitudinal axis

[0122] 9First coupling gap

[0123] 10 Second coupling gap

[0124] 11 Second plug connector body

[0125] 12 Second longitudinal axis

[0126] 13 Insert the pipe

[0127] 14 expansion section

[0128] 15 coupling section

[0129] 16 coupling slots

[0130] 17 First Leg

[0131] 18 Second leg

[0132] 19 basic legs

[0133] 20 First leg section

[0134] 21 Second leg section

[0135] 22 Leg connection section

[0136] 23 supporting legs

[0137] 24 First radial distance

[0138] 25 second radial distance

[0139] 26 guide surface

[0140] 27 stop element

[0141] 28 keep recess

[0142] (E) plane

[0143] (M) Middle plane

Claims

1. A method for coupling plug connectors to form a plug assembly (1), which is designed for connecting lines for liquid and / or gaseous media, in which the following steps are performed: A first female plug connector (2) is provided, the first plug connector (2) having a first plug connector body (6) of tubular construction, the first plug connector body defining a female receiving space (7) having a first longitudinal axis (8), wherein: At least a first coupling slot (9) and a second coupling slot (10) are arranged radially opposite one another in the first plug connector body (6), - providing a male second plug connector (3), which has a second plug connector body (11) of tubular construction, which has: - hollow cylindrical insert (13), a conically widening expansion section (14) connected to the insertion nozzle, and a coupling section (15) connected to the expansion section and having a coupling groove (16), wherein a second longitudinal axis (12) is defined by the second plug connector body (11), - providing at least one sealing element (4) and arranging the sealing element in the first plug connector (2), - providing a locking element (5) which is of bow-shaped design and is in releasable form-locking engagement with the first plug connector (2) and the second plug connector (3) when the first plug connector (2) is in the coupled position, the locking element (5) comprising: - first leg (17), - the second leg (18) and - a base leg (19), the base leg (19) connecting the first leg (17) and the second leg (18) to each other, each of the first leg (17) and the second leg (18) comprising: ——The first leg section (20-1, 20-2), - the second leg section (21-1, 21-2), and - a leg connecting section (22-1, 22-2), which connects the first leg section (20-1; 20-2) and the second leg section (21-1; 21-2) to each other, and the first leg sections (20-1, 20-2) are arranged on the base leg (19) on sides facing away from each other to connect to the base leg, wherein in an undeformed initial position, at least two of the second leg sections (21-1, 21-2) are oriented so as to extend parallel to each other, and furthermore, the two leg connecting sections (22-1, 22-2) are oriented so as to approach each other toward the base leg (19), - the locking element (5) is arranged in the first coupling slot (9) and the second coupling slot (10) of the first plug connector body (6), and in this case the base leg (19) of the locking element (5) is arranged in a first position in its middle part between the first leg (17) and the second leg (18) at a first radial distance (24) from the first longitudinal axis (8), the longitudinal axes (8, 12) of the first plug connector (2) and the second plug connector (3) are oriented relative to one another, - moving the first plug connector (2) and the second plug connector (3) toward each other and gradually inserting the second plug connector (3) into the female receiving space (7) of the first plug connector (2), (a) pushing in the hollow cylindrical insertion tube (13), wherein the two leg connecting sections (22-1, 22-2) are respectively arranged in a partial section directly adjacent to the hollow cylindrical insertion tube (13) or in contact with the hollow cylindrical insertion tube (13) at a first contact section, (b) the insertion process is continued in the axial direction, wherein the two second leg sections (21-1, 21-2) are supported on the conically widening expansion section (14) in each case in abutment with the other contact section, and wherein the base leg (19) of the locking element (5) is arranged in a second position in its middle part between the first leg (17) and the second leg (18) at a second radial distance (25) from the longitudinal axis (8, 12), and the second radial distance (25) has a greater value than the first radial distance (24), (c) The insertion process is continued further in the axial direction, wherein the locking element (5) engages with the second leg section (21-1) of its first leg (17) in the first coupling gap (9) and the coupling groove (16) when the first plug connector (2) and the second plug connector (3) are in the coupled position with each other, and the second leg (18) engages with its second leg section (21-2) in the second coupling gap (10) and the coupling groove (16).

2. The method according to claim 1, characterized in that The longitudinal axes (8, 12) of the first plug connector (2) and the second plug connector (3) are oriented in alignment with each other.

3. The method according to claim 1, characterized in that When the coupling position is reached, the locking element (5) is adjusted back with its base leg (19) into the first position.

4. The method according to any one of claims 1 to 3, characterized in that In step (a) of the axial insertion process of the second plug connector (3) into the female receiving space (7) of the first plug connector (2), the two second leg sections (21-1, 21-2) are each arranged spaced apart from the hollow cylindrical insertion socket (13) in the radial direction.

5. The method according to any one of claims 1 to 3, characterized in that After step (b) has been initiated, the two leg connecting sections (22-1, 22-2) are lifted from the conically widening expansion section (14).

6. The method according to any one of claims 1 to 3, characterized in that During step (b) of the axial insertion process, the radial distance between the centers of the base legs (19) is continuously increased starting from the value of the first radial distance (24) to a second value of the second radial distance (25).

7. The method according to any one of claims 1 to 3, characterized in that The two leg connecting sections (22-1, 22-2) of the locking element (5) are respectively arranged or accommodated with a majority of their length in the coupling groove (16) when the first plug connector (2) and the second plug connector (3) are in the coupling position.

8. The method according to any one of claims 1 to 3, characterized in that The base leg (19) of the locking element (5) is supported in abutting relation on the first plug connector (2) at least in the coupled position.

9. The method according to any one of claims 1 to 3, characterized in that A central section of the base leg (19) of the locking element (5) rests against the first plug connector (2) at least in the coupled position.

10. The method according to any one of claims 1 to 3, characterized in that The value of the second radial distance (25) of the base leg (19) from the longitudinal axis (8, 12) is at a maximum after the first leg (17) and the second leg (18) leave the expansion section (14) and before the two second leg sections (21-1, 21-2) are each introduced into the coupling groove (16).

11. A plug-in assembly (1) for connecting a pipeline for a liquid and / or gaseous medium, the plug-in assembly comprising: a first female plug-in connector (2), the first plug-in connector (2) having a first plug-in connector body (6) of tubular construction, the first plug-in connector body defining a female receiving space (7) having a first longitudinal axis (8), wherein at least a first coupling slot (9) and a second coupling slot (10) are arranged radially opposite one another in the first plug-in connector body (6), a male second plug connector (3), the second plug connector (3) having a second plug connector body (11) of tubular construction, the second plug connector body having: - hollow cylindrical insert (13), a conically widening expansion section (14) connected to the insertion nozzle, and a coupling section (15) connected to the expansion section and having a coupling groove (16), wherein the second plug connector body (11) defines a second longitudinal axis (12), - wherein the first plug connector (2) and the second plug connector (3) can be brought into a releasable coupling position in the axial direction, at least one sealing element (4), which is arranged in the first female plug connector (2), a locking element (5) which is of bow-shaped design and is in a releasable form-fitting engagement with the first plug-in connector (2) and the second plug-in connector (3) in the coupled position, the locking element (5) comprising: - first leg (17), - the second leg (18) and - a base leg (19), the base leg (19) connecting the first leg (17) and the second leg (18) to each other, each of the first leg (17) and the second leg (18) comprising: ——The first leg section (20-1, 20-2), - the second leg section (21-1, 21-2), and - a leg connecting section (22-1, 22-2), which connects the first leg section (20-1; 20-2) and the second leg section (21-1; 21-2) to each other, and the first leg sections (20-1, 20-2) are arranged on the base leg (19) on sides facing away from each other and connected to the base leg, wherein in an undeformed initial position, at least two of the second leg sections (21-1, 21-2) are oriented so as to extend parallel to each other, and furthermore, the two leg connecting sections (22-1, 22-2) are oriented so as to approach each other toward the base leg (19), - wherein the locking element (5) engages with its first leg (17) in the first coupling slot (9) and the coupling groove (16) when the first plug connector (2) and the second plug connector (3) are in the coupled position, and the second leg (18) engages with the second coupling slot (10) and the coupling groove (16), and wherein the base leg (19) of the locking element (5) is arranged in a first position at a first radial distance (24) from the longitudinal axis (8, 12) in its middle portion between the first leg (17) and the second leg (18), at least in the coupled position, It is characterized in that When the second plug connector (3) begins to be axially inserted into the female receiving space (7) of the first plug connector (2), the two leg connecting sections (22) are each arranged in a partial section directly adjacent to the hollow cylindrical insertion tube (13) or in contact with the hollow cylindrical insertion tube (13) on the first contact section, - when further inserted in the axial direction, the two second leg sections (21-1, 21-2) are supported on the conically widening expansion section (14), each resting against a further contact section, - at least in the position of the second leg section (21-1, 21-2) resting on the conically widening expansion section (14), the base leg (19) of the locking element (5) is arranged in a second position in its middle part between the first leg (17) and the second leg (18) at a second radial distance (25) from the longitudinal axis (8, 12), and - The second radial distance (25) has a greater value than the first radial distance (24).

12. The plug-in assembly (1) according to claim 11, characterized in that The plug-in assembly (1) is used to implement the method according to any one of claims 1 to 10.

13. The plug-in assembly (1) according to claim 11, characterized in that When the locking element (5) is in the coupling position, the base leg (19) is adjusted back into its first position.

14. The plug-in assembly (1) according to any one of claims 11 to 13, characterized in that When the second plug connector (3) is initially inserted axially into the female receiving space (7) of the first plug connector (2), the two second leg sections (21-1, 21-2) are each arranged at a distance from the hollow cylindrical insertion socket (13) in the radial direction.

15. The plug-in assembly (1) according to any one of claims 11 to 13, characterized in that When the two second leg sections (21-1, 21-2) are supported on the conically widening expansion section (14), the two leg connecting sections (22-1, 22-2) are arranged at a distance from the conically widening expansion section (14).

16. The plug-in assembly (1) according to any one of claims 11 to 13, characterized in that The two leg connecting sections (22-1, 22-2) of the locking element (5) are respectively arranged or accommodated with a majority of their length in the coupling groove (16) when the first plug connector (2) and the second plug connector (3) are in the coupling position.

17. The plug-in assembly (1) according to any one of claims 11 to 13, characterized in that The base leg (19) of the locking element (5) is supported in abutting relation on the first plug connector (2) at least in the coupled position.

18. The plug-in assembly (1) according to any one of claims 11 to 13, characterized in that A central section of the base leg (19) of the locking element (5) rests against the first plug connector (2) at least in the coupled position.

19. The plug-in assembly (1) according to any one of claims 11 to 13, characterized in that The value of the second radial distance (25) of the base leg (19) has a maximum value before the two second leg sections (21-1, 21-2) are respectively introduced into the coupling groove (16).

20. The plug-in assembly (1) according to any one of claims 11 to 13, characterized in that The base leg (19) has a roof-shaped, angled longitudinal direction starting from its center portion between the first leg (17) and the second leg (18) toward the first leg (17) and the second leg (18).

21. The plug-in assembly (1) according to any one of claims 11 to 13, characterized in that The two first leg sections (20-1, 20-2) are oriented so as to extend parallel to one another in the undeformed initial position of the locking element (5).

22. The plug-in assembly (1) according to any one of claims 11 to 13, characterized in that The base leg (19), each first leg section (20-1, 20-2), each leg connecting section (22-1, 22-2) and each second leg section (21-1, 21-2) are arranged to extend in a common plane (E).

23. The plug-in assembly (1) according to claim 22, characterized in that A supporting leg (23-1, 23-2) is provided on each of the second leg sections (20-1, 20-2) at its end facing away from the base leg (19), and the supporting legs (23-1, 23-2) each have a longitudinal orientation that is oriented in a normal direction with respect to the common plane (E).

24. The plug-in assembly (1) according to claim 23, characterized in that The two supporting legs (23-1, 23-2) are respectively supported between a first position of the base leg (19) and a second position of the base leg (19) and in opposite contact on the first plug connector body (6).

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