Patent Publication Number: US-2022231448-A1

Title: Plug connector device, plug connector and connection cable

Description:
PRIOR ART 
     The invention concerns a plug connector device, in particular an optical plug connector device, according to the preamble of claim  1 , a plug connector according to claim  16  and a connection cable according to claim  17 . 
     From U.S. Pat. No. 9,606,500 B2 a plug connector is already known which has an outer housing as well as an inner housing comprising two inner housing elements, wherein the inner housing is configured to accommodate an optical plug. 
     The objective of the invention is in particular to provide a generic plug connector device with improved characteristics in regard to construction. The objective is achieved according to the invention by the features of patent claims  1 ,  16  and  17  while advantageous implementations and further developments may be gathered from the subclaims. 
     Advantages of the Invention 
     The invention is based on a plug connector device, in particular an optical plug connector device, with an outer housing and with an inner housing comprising at least one first inner housing element and at least one second inner housing element, which are in an assembled state together configured to receive at least one plug element. 
     It is proposed that the first inner housing element and the second inner housing element comprise at least one receiving section that is configured to receive a fixing element. 
     Such an implementation in particular allows providing a plug connector device having improved characteristics regarding construction. Furthermore, in particular especially simple, quick and in particular especially reliable assembly is enabled by means of the plug connector device. It is in particular possible to provide an especially advantageous strain relief by the plug connector device. Furthermore, in particular a reliability and/or a lifetime may be improved. 
     The plug connector device may be implemented at least as a portion, in particular as a sub-assembly group, of a plug connector. In particular, the plug connector device may also comprise the entire plug connector. The plug connector could, for example, be realized as an electric plug connector. Preferably the plug connector is realized as an optical plug connector. It would also be conceivable that the plug connector is realized as a hybrid plug connector, which is configured to create at least one electric plug connection as well as at least one optical plug connection. The plug connector device could, for example, be realized as an electric plug connector device. Preferably the plug connector device is realized as an optical plug connector device. It would also be conceivable that the plug connector device is realized as a hybrid plug connector device. 
     The plug connector device comprises an outer housing, which is in particular at least substantially protected from environment influences. The outer housing is advantageously at least partly, preferably completely, sealed against environment influences. In particular, the outer housing is protected, in particular sealed, against an entry of water, for example splash water and/or rain water or the like, and/or advantageously against an entry of dust. It would be conceivable that the outer housing comprises sealing elements for a sealing against environment influences. The outer housing could, for example, comprise a protection, in particular a sealing, in accordance with an IP67 classification, advantageously with an IP68 classification. In particular, the plug connector device, and in particular a plug comprising the plug connector device, is suitable for an in particular permanent outdoor application. By “at least substantially” is to be understood, in this context, that a deviation from a given value is in particular less than 25%, preferably less than 10% and especially preferentially less than 5% of the given value. 
     The inner housing comprises in particular precisely one first inner housing element and in particular precisely one second inner housing element. An assembled state is in particular equivalent to a mounted, in particular functional, state, in particular in a connection with a cable. 
     In the assembled state at least one plug element and preferably at least two plug elements is/are arranged, in particular accommodated, at least partially between the first inner housing element and the second inner housing element. The at least one plug element, preferably the at least two plug elements, may be arranged completely within the inner housing, in particular between the first inner housing element and the second inner housing element. In the assembled state, the at least one plug element, preferably the at least two plug elements, may be mounted, in particular fixed, at least partially on the first inner housing element and/or the second inner housing element. The plug connector device may comprise the at least one plug element, preferably the at least two plug elements. 
     The plug element may, for example, comprise at least one optical plug and/or at least one electric plug. In particular, the plug element may be realized as an optical plug and/or as an electric plug. The plug element may, for example, comprise at least one component which holds the optical plug and/or the electric plug in the assembled state. In particular, the plug element may comprise at least one plug holder. In particular, the plug element may be realized as a plug holder, holding the optical plug and/or the electric plug in the assembled state. 
     The first inner housing element and the second inner housing element in particular in each case have at least one receiving section. The fixing element is in the assembled state arranged at least partially, preferably completely, within the receiving section. In particular, in the assembled state the first inner housing element forms the receiving section together with the second inner housing element. The receiving section is in the assembled state in particular a subsection of the inner housing, in particular with respect to an axial direction of the plug connector device, in particular of the plug. The axial direction of the plug connector device, in particular the plug, in particular corresponds to a main extension direction of the plug connector device, in particular the plug, said main extension direction running parallel to a longest edge of a smallest geometric rectangular cuboid which just still completely encloses the plug connector device, in particular the plug. The receiving section is in particular arranged on an end of the inner housing which is situated opposite a plugging side of the plug connector device that is arranged in a plugging direction. For example, the receiving section may be realized as a subsection of the inner housing, in particular of the first inner housing element and the second inner housing element, having for example a length of at least 2 mm, advantageously at least 4 mm, especially advantageously at least 6 mm, preferably at least 10 mm and preferably at least 12 mm. 
     “Configured” is to mean specifically designed and/or equipped. By an object being configured for a certain function is in particular to be understood that the object fulfills and/or executes said certain function in at least one application state and/or operation state. 
     Furthermore it is proposed that the first inner housing element and the second inner housing element are in each case realized as inner housing half-shells, which are in the assembled state connected to each other along an axial direction, in particular an axial direction of the plug connector device and/or of the plug connector. The first inner housing element and the second inner housing element are in particular realized as separate components. The first inner housing element and the second inner housing element may be realized, in particular at least substantially and preferably completely, identically to each other. In particular, the first inner housing element and the second inner housing element are realized as cast parts, in particular injection-molded parts. By at least one first element being “connected” to at least one further element is to be understood that the first element is advantageously connected to the further element at least via a force-fit connection and/or at least via a form-fit connection, for example by riveting and/or by a latch connection and/or by a tongue-and-groove connection and/or by a clamping connection and/or by a further connection that is deemed expedient by someone skilled in the art, and/or connected to the further element by substance-to-substance bond, for example via a welding process, a gluing process, an injection-molding process and/or via a further process deemed expedient by someone skilled in the art. Such an implementation in particular allows ensuring advantageous, in particular simple, mounting. In particular, such an implementation allows maintaining accessibility of the interior of the inner housing, in particular during assembly of the inner housing. Moreover, if the two inner housing elements are realized identically to each other, it is in particular possible to improve efficiency, in particular cost efficiency. 
     It is also proposed that the first inner housing element and the second inner housing element have, at least in the receiving section, geometries at least substantially complementing each other. In the assembled state the first inner housing element and the second inner housing element, in particular in the receiving section, in particular viewed in the axial direction, form a continuous shape. The first inner housing element and the second inner housing element have geometries, in particular shapes, which are realized, at least in the receiving section, at least substantially, preferably completely, identically to each other. In particular, at least in the receiving section, the first inner housing element could be realized mirror-symmetrically to the second inner housing element, in particular relative to the axial direction. Such an implementation in particular allows ensuring improved characteristics in regard to assembly. In particular, a simple, in particular form-fitting, accommodation of the fixing element in the receiving section may be ensured. It is thus further possible to improve in particular stability and/or reliability and preferably tightness. 
     In addition it is proposed that in the assembled state the first inner housing element forms together with the second inner housing element a hollow receiving stud in the receiving section. The hollow receiving stud in particular extends in the receiving section, in particular in the axial direction. In particular, the first inner housing element and the second inner housing element respectively comprise a half hollow receiving stud. In particular in a view of a cross section area of the hollow receiving stud, the receiving stud is implemented in a hollow manner, in particular area-related, by at least 20%, advantageously by at least 30%, especially advantageously by at least 50%, preferably by at least 70% and particularly preferentially by at least 80%. In particular, the hollow receiving stud may have an at least substantially angular outer contour in a view in the axial direction. In particular, the hollow receiving stud may have an at least substantially triangular, tetragonal or polygonal outer contour in a view in the axial direction. Preferably, the hollow receiving stud has an at least substantially round outer contour in a view in the axial direction. Such an implementation in particular allows carrying out an advantageous assembly. Furthermore, in particular stability can be improved. 
     It is further proposed that the inner housing has in the receiving section an adjoining surface for a strength element of a cable. In particular, the first inner housing element and/or the second inner housing element have/has an adjoining surface for the strength element of the cable. In particular, the adjoining surface is at least a portion of an outer surface of the hollow receiving stud. In the assembled state at least a portion of the strength element of the cable is in the receiving section adjacent to the adjoining surface of the inner housing. The strength element may be realized, for example, as a reinforcing fiber or as a plurality of reinforcing fibers of an optical cable. Alternatively or additionally, the strength element could be realized, for example, as a drain wire, in particular as a drain wire of an electric cable and/or of a hybrid cable. Alternatively or additionally, the strength element may be realized as a shield of the optical cable, the electric cable and/or the hybrid cable. The strength element may in particular be a strain relief element, which is in particular configured for relieving a strain on the cable, in particular on conduction elements of the cable. Such an implementation in particular allows obtaining a high degree of stability. It is in particular possible to improve the construction of the plug connector device at least in regard to reliability. 
     It is also proposed that the plug connector device comprises the fixing element, which in an assembled state at least partially engages around the first inner housing element and the second inner housing element, connecting them to each other, in particular fixing them with each other. In particular, the fixing element may in the assembled state connect the first inner housing element together with the second inner housing element to further connection members. In particular, in the assembled state the first inner housing element and the second inner housing element may be connected to each other, in particular fixed with each other, merely by means of the fixing element. In particular, the fixing element is plastically deformable for assembly. It would be conceivable that the fixing element is embodied, for example, as a cable tie and/or as a clamp or something like that. Preferably the fixing element is realized as a crimp element, in particular as a crimp ring or a crimp sleeve. The fixing element engages around the first inner housing element and the second inner housing element in the receiving section at least partially, and preferably completely. In particular, the fixing element engages around the hollow receiving stud at least partly, preferably completely. Such an implementation in particular allows achieving improved characteristics regarding fixing, in particular regarding stability. 
     Furthermore it is proposed that the fixing element is in the assembled state configured to press the strength element to the adjoining surface. In the assembled state, the fixing element fixes the strength element on the inner housing, in particular on the first inner housing element and/or on the second inner housing element, in particular in the receiving section, in particular at the adjoining surface. In particular, the fixing element presses in the assembled state the strength element to the adjoining surface, in particular for a fixing of the strength element at the adjoining surface. Such an implementation in particular allows providing a simple and/or in particular an especially effective strain relief. It is thus moreover possible to simplify an assembly of a strain relief. 
     Beyond this it is proposed that the fixing element comprises a cable claw, which is configured to claw a cable jacket, in particular of the cable. In particular, in the assembled state the fixing element claws the cable jacket of the cable via the cable claw. The cable claw may be implemented for example, without being limited thereto, as an edge of the fixing element pointing radially inward, in particular when viewed in the axial direction. In particular, the cable claw is a projection in the interior of the fixing element, which is in particular arranged circumferentially. 
     Alternatively or additionally, the cable claw may comprise at least one jag and/or at least one tip pointing radially inward, in particular when viewed in the axial direction. Such an implementation allows further improving the construction, in particular in regard to stability. Such an implementation in particular allows obtaining advantageous characteristics regarding strain relief. 
     Beyond this it is proposed that in the assembled state the first inner housing element and/or the second inner housing element have/has at least one fixing contour in the receiving section. In particular, the first inner housing element and the second inner housing element have mutually complementary fixing sub-contours, the fixing contour being realized so as to be continuous, in particular in the assembled state. In particular, the fixing contour comprises a projection of the inner housing, in particular of the first inner housing element and/or of the second inner housing element, which—in particular viewed in the axial direction—extends around the hollow receiving stud at least section-wise, preferably completely. In particular, at least a portion of the fixing contour is part of the adjoining surface. 
     The fixing contour is configured, in particular in the assembled state, to claw the strength element in the receiving section, in particular on the adjoining surface, and in particular via pressing by the fixing element. It would in particular be conceivable that the fixing element comprises a corresponding further fixing contour in the interior of the fixing element, in particular when viewed in the axial direction. 
     Such an implementation allows providing an improved construction in particular in regard to stability, in particular providing an advantageous strain relief. 
     It is furthermore proposed that in the assembled state the fixing element has a first cross section with a first inner diameter and at least one second cross section with a second inner diameter substantially differing from the first inner diameter. In particular, the first inner diameter of the first cross section of the fixing element is in the assembled state greater than the second inner diameter of the second cross section of the fixing element, for example, at least by 5%, advantageously at least by 7%, especially advantageously at least by 10%, preferably at least by 12.5% and particularly preferentially at least by 15%. In particular, the first inner diameter of the first cross section of the fixing element is in the assembled state greater than the second inner diameter of the second cross section of the fixing element, for example, by maximally 25%, advantageously by maximally 22.5%, especially advantageously by maximally 20%, preferably by maximally 17.5% and particularly preferentially by maximally 16%. In particular, an inner contour of the fixing element is in the assembled state at least partially adapted to the fixing contour. In particular, the fixing element, in particular in a pre-crimped state, is crimped at least to an outer measurement of the fixing contour by means of a first crimp stage. Advantageously, the fixing element is in an assembled state moreover crimped to an inner measurement of the fixing contour by means of a further crimp stage wherein in particular the strength element of the cable is in the assembled state arranged between the fixing contour of the fixing element and the adjoining surface. In particular, in a cross-sectional view, the fixing element is in the assembled state formed in a wave shape. In particular, the fixing element comprises in the assembled state a plurality of ribs. Preferably the receiving section comprises a plurality of ribs, thus providing a shaping that corresponds to the fixing element. In the assembled state, the strength element of the cable is arranged between the fixing element and the receiving section in a wave shape. Such an implementation in particular allows augmenting a strength, in particular a tensile strength. It is thus in particular achievable that the strength element of the cable is in the assembled state snaked along between the contour of the fixing element and the receiving section, thus allowing to further augment the tensile strength. 
     In a method for producing the plug connector device, the fixing element is in a first step crimped to an outer measurement of the fixing contour by means of a first crimp stage, wherein in particular the strength element of the cable is arranged between the fixing contour and the fixing element. In particular, the fixing element is in the first step crimped to the outer measurement of the fixing contour by means of a round crimping mold. In a second step the fixing element is crimped to an inner measurement of the fixing contour by means of a second crimp stage. In particular, the fixing element is in the second step crimped to the inner measurement of the fixing contour by means of a second crimping mold, which in particular has rills. 
     It is further proposed that the plug connector device comprises at least one reinforcement element, which is in the assembled state arranged in the receiving section between the first inner housing element and the second inner housing element, in particular within the receiving stud. In particular, the reinforcement element is arranged in the receiving section in a hollow space of the hollow receiving stud. The reinforcement element may in particular be embodied as a pin, for example a metal pin. In particular, the reinforcement element may be realized so as to be hollow inside. Preferably the reinforcement element has an at least substantially round cross section, which in particular allows providing an especially high strength in the receiving section. The reinforcement element is in particular embodied as a sleeve, in particular as a metallic sleeve. Preferably the reinforcement element has a length in the axial direction of the plug connector device that is substantially equivalent to a corresponding length of the fixing element. Such an implementation in particular allows realizing a mounting of the fixing element via an in particular greater crimp force. Furthermore, in the assembled state the inner housing element may be reinforced by the reinforcement element. It is in particular possible to ensure an increased strength in the receiving section, and thus in particular an augmented stability and/or an increased lifetime. 
     In a further aspect of the invention, which may in particular be considered on its own or together with other aspects of the invention, it is proposed that the inner housing comprises at least one guiding unit, which is configured to guide at least one conduction element in particular to the plug element. In particular, at least a portion of the guiding unit may be part of the first inner housing element and/or of the second inner housing element. By such an implementation in particular an augmented reliability is enabled. It is thus in particular possible to avoid damaging of the conduction element. 
     It is also proposed that the guiding unit is configured to delimit a bending radius of the conduction element in the inner housing to a minimum radius. In particular, the guiding unit is configured to delimit the bending radius of the conduction element in the inner housing in such a way that the bending radius of the conduction element in the inner housing is in the assembled state, for example, at least a 5-fold of a conduction cross section of the conduction element, advantageously at least a 7.5-fold of a conduction cross section of the conduction element, especially advantageously at least a 10-fold of a conduction cross section of the conduction element, preferably at least a 15-fold of a conduction cross section of the conduction element, particularly preferentially at least a 20-fold of a conduction cross section of the conduction element. Such an implementation in particular allows ensuring a high level of reliability. In particular, in this way damaging of the conduction element is avoidable. Furthermore, it is thus possible to ensure advantageous data transmission via the conduction element. 
     It is moreover proposed that the first inner housing element and the second inner housing element each comprise a guiding subchannel for guiding the conduction element, in particular to the plug element. In particular, in the assembled state the first inner housing element and the second inner housing element form a guiding channel for guiding the conduction element, in particular to the plug element. Such an implementation in particular allows holding the conduction element in a mounting position, which in particular simplifies mounting and/or assembly. By such an implementation it is in particular possible to prevent damaging of the conduction element, in particular during assembly and/or at low temperatures. 
     It is further proposed that the first inner housing element and/or the second inner housing element comprise/s in the guiding subchannel at least one holding element for holding the conduction element in the guiding subchannel. In particular, the holding element is realized as a low-holding element. In particular, the holding element that is realized as a low-holding element is in the assembled state free of a clamping of the conduction element. It would be conceivable, for example, that the holding element is embodied as a cable clip. It would furthermore be conceivable that the holding element is embodied as a flexible plastic lip, which is configured, in an assembled state, to clamp the at least one conduction element. It would also be conceivable that the holding element at least prevents an axial displacement of the conduction element by holding the conduction element. Such an implementation in particular allows ensuring a high level of reliability. It is thus in particular possible to avoid damaging of the conduction element. Moreover, this advantageously ensures advantageous data transmission via the conduction element. 
     Furthermore it is proposed that the first inner housing element and the second inner housing element each comprise a second guiding subchannel for guiding a further conduction element, in particular to the plug element. In particular, in the assembled state the first inner housing element and the second inner housing element form a second guiding channel for guiding the conduction element, in particular to the plug element. In particular, such an implementation allows holding the conduction element in a mounting position, thus in particular simplifying mounting and/or assembly. By such an implementation it is in particular possible to prevent damaging of the conduction element, in particular during assembly and/or at low temperatures. 
     The invention also concerns a plug connector, in particular an optical plug connector, with the plug connector device. Such a plug connector allows providing improved characteristics in regard to construction. 
     Beyond this the invention concerns a connection cable, in particular an optical connection cable, with the at least one plug connector and with a cable that is assembled with the plug connector. Such a connection cable in particular provides improved characteristics in regard to reliability and/or in regard to assembly. 
     The plug connector device according to the invention shall herein not be limited to the application and implementation described above. In particular, for the purpose of fulfilling a functionality that is described here, the plug connector device according to the invention may comprise a number of individual elements, components and units that differs from a number given here. 
    
    
     
       DRAWINGS 
       Further advantages may be gathered from the following description of the drawings. In the drawings five exemplary embodiments of the invention are illustrated. The drawings, the description and the claims contain a plurality of features in combination. Someone skilled in the art will purposefully also consider the features separately and will find further expedient combinations. 
       It is shown in: 
         FIG. 1  a plug connector with a plug connector device, in an exploded view, 
         FIG. 2  the plug connector in an assembled state, in a schematic perspective view, 
         FIG. 3  the plug connector device with an inner housing and with a fixing element, in a schematic perspective view, 
         FIG. 4  a perspective sectional view of the inner housing with a first inner housing element and with a second inner housing element, 
         FIG. 5  a portion of the inner housing with the first inner housing element and with an adjoining surface for a strength element of a cable, 
         FIG. 6  the inner housing with the fixing element accommodated in a receiving section of the inner housing, 
         FIG. 7  a plug connector device of a further exemplary embodiment, in a schematic perspective view, 
         FIG. 8  a portion of the plug connector device with a portion of an inner housing of the plug connector device comprising a first inner housing element, in a schematic perspective view, 
         FIG. 9  a plug connector device of a further exemplary embodiment, in a schematic perspective view, 
         FIG. 10  a portion of the plug connector device with a portion of an inner housing of the plug connector device comprising a first inner housing element, in a schematic perspective view, 
         FIG. 11  a plug connector device of a further exemplary embodiment with a centering unit, in a schematic perspective view, 
         FIG. 12  a portion of a plug connector device of a further exemplary embodiment in a pre-assembled state, in a perspective view, 
         FIG. 13  the plug connector device with a portion of an inner housing of the plug connector device with a first inner housing element in a preassembled state, in a schematic sectional perspective view, 
         FIG. 14  the plug connector device with a fixing element in an assembled state, in a perspective view, 
         FIG. 15  the plug connector device with a fixing element in an assembled state, in a schematic sectional perspective view, and 
         FIG. 16  a flow chart of a method for producing a plug connector device. 
     
    
    
     DESCRIPTION OF THE EXEMPLARY EMBODIMENTS 
       FIG. 1  shows a plug connector  12   a  in an exploded view.  FIG. 2  shows a connection cable  82   a , which is embodied as an optical connection cable. The connection cable  82   a  comprises the plug connector  12   a  as well as a cable  36   a  that is assembled with the plug connector  12   a . The plug connector  12   a  is realized as an optical plug connector. The plug connector  12   a  comprises a plug connector device  10   a  (cf.  FIGS. 1 and 2 ). The plug connector  12   a  is sealed against environment influences and is suitable for an outdoor use. 
     The plug connector device  10   a  comprises an outer housing  14   a . The outer housing  14   a  comprises a bushing  56   a . The bushing  56   a  is implemented of a flexible synthetic material. The bushing  56   a  is configured to prevent a kinking of a cable and to provide the cable with a strain relief. The bushing  56   a  comprises an inner thread  58   a , by means of which the bushing  56   a  can be screwed onto a cable screwing  60   a  of the outer housing  14   a.    
     The cable screwing  60   a  and the bushing  56   a  respectively comprise a hexagonal tool holder  62   a , which is in particular configured for receiving a spanner wrench. The cable screwing  60   a  comprises an outer thread  64   a  that corresponds to the inner thread  58   a . The outer housing  14   a  moreover comprises a sealing element  66   a.    
     The outer housing  14   a  furthermore comprises a cable tie  68   a , which is in the assembled state fastened around a sleeve  70   a , in particular in order to prevent undesired sliding of a sliding collar  72   a  of the outer housing  14   a . The sliding collar  72   a  comprises a plurality of recesses, which together form a triangular groove  74   a.    
     In the assembled state the groove  74   a  accommodates a plurality of pins  78   a  of an actuation element  76   a  of the outer housing  14   a . The actuation element  76   a  is rotatable. The sliding collar  72   a  is displaceable by a rotation of the actuation element  76   a , via a corresponding force transmission by the pins  78   a  to the groove  74   a . By rotation of the actuation element  76   a , causing a displacement of the sliding collar  72   a , a locking mechanism of the plug connector  12   a  is operated. 
     The outer housing  14   a  further comprises a coding member  84   a . The coding member  84   a  is embodied as a color-coding ring. In the assembled state the coding member  84   a , which is embodied as a color-coding ring, sits in a corresponding recess of the actuation element  76   a . In the assembled state the coding member  84   a  is visible from an outside. 
     The outer housing  14   a  also comprises a spring element  86   a . The spring element  86   a  is realized as a sinuous spring. In the assembled state the spring element  86   a  has been slid onto the sleeve  70   a . In the assembled state the spring element  86   a  provides a spring force acting onto the actuation element  76   a . In the assembled state the spring force prevents an inadvertent releasing of the plug connector  12   a.    
     The sleeve  70   a  is realized so as to be hollow and has a substantially cylindrical shape. The sleeve  70   a  is in particular free of orientation means. The sleeve  70   a  comprises an inner thread (not shown), via which the sleeve  70   a  can be screwed with a corresponding outer thread of the cable screwing  60   a . The outer housing  14   a  further comprises an O-ring  88   a . In the assembled state the O-ring  88   a  sits in a recess  90   a  of the sleeve  70   a . The O-ring  88   a  serves for a further sealing of the outer housing  14   a  against environment influences. 
     The outer housing  14   a  moreover comprises a closure  92   a . The closure  92   a  is realized as a dust-protection cap. The closure  92   a  comprises a fastening member  94   a . The closure  92   a  is in the assembled state fastened by means of the fastening member  94   a . The fastening member  94   a  is embodied as a flexible loop. 
     The plug connector device  10   a  further comprises an inner housing  16   a . The inner housing  16   a  comprises a first inner housing element  18   a . The inner housing  16   a  furthermore comprises a second inner housing element  20   a.    
     The plug connector device  10   a  comprises two plug elements  22   a . The first inner housing element  18   a  and the second inner housing element  20   a  are in the assembled state configured to accommodate the two plug elements  22   a  (cf.  FIGS. 1 and 2 ). 
     The first inner housing element  18   a  and the second inner housing element  20   a  comprise a receiving section  24   a . Viewed in an axial direction  28   a , the receiving section  24   a  is arranged on a side of the inner housing  16   a  that is situated opposite a plugging side of the plug connector  12   a . The receiving section  24   a  is configured to receive a fixing element  26   a.    
     The first inner housing element  18   a  and the second inner housing element  20   a  are respectively embodied as inner housing half-shells. In the assembled state the first inner housing element  18   a  and the second inner housing element  20   a  are connected to each other along the axial direction  28   a.    
     The first inner housing element  18   a  and the second inner housing element  20   a  have at least in the receiving section  24   a  a mutually complementary geometry (cf.  FIGS. 3 and 4 ). In the assembled state the first inner housing element  18   a  and the second inner housing element  20   a  form a continuous receiving section  24   a . In the illustrated example, the first inner housing element  18   a  and the second inner housing element  20   a  have in the receiving section  24   a  a substantially half-hollow-cylindrical shaping. 
     The first inner housing element  18   a  comprises a first sub-stud  96   a  in the receiving section  24   a . The second inner housing element  20   a  comprises a second sub-stud  98   a  in the receiving section  24   a . In the assembled state, the first inner housing element  18   a  forms together with the second inner housing element  20   a  a hollow receiving stud  30   a  in the receiving section  24   a.    
     Beyond this the plug connector device  10   a  comprises the fixing element  26   a . In the assembled state the fixing element  26   a  connects the first inner housing element  18   a  and the second inner housing element  20   a  at least partially. In the present example, the first inner housing element  18   a  and the second inner housing element  20   a  further comprise latching members  100   a  for a connection to each other. 
     In the illustrated exemplary embodiment the fixing element  26   a  is embodied as a crimp ring. In the assembled state, the fixing element  26   a  engages completely around the first inner housing element  18   a  and the second inner housing element  20   a  in the receiving section  24   a . In the assembled state, the fixing element engages around the receiving stud  30   a  in the receiving section  24   a.    
     The inner housing  16   a  comprises in the receiving section  24   a  an adjoining surface  32   a  for a strength element  34   a  of the cable  36   a  (cf.  FIGS. 5 and 6 ). The strength element  34   a  of the cable  36   a  is realized as reinforcing fibers of the cable  36   a . The adjoining surface  32   a  for the strength element  34   a  of the cable  36   a  is an outer surface of the hollow receiving stud  30   a  in the receiving section  24   a.    
     The fixing element  26   a  is in the assembled state configured to press the strength element  34   a  to the adjoining surface  32   a . The fixing element  26   a  is in the assembled state configured to press the strength element  34   a  against the hollow receiving stud  30   a  in the receiving section  24   a.    
     The first inner housing element  18   a  has in the receiving section a fixing contour  42   a . Furthermore, the second inner housing element  20   a  has in the receiving section  24   a  a fixing contour  42   a . The fixing contour  42   a  comprises a plurality of radial elevations. The fixing contour  42   a  serves for an additional fixing of the strength element  34   a  on the receiving stud  30   a.    
     The inner housing  16   a  comprises a guiding unit  46   a . The guiding unit  46   a  is configured to guide at least one conduction element  48   a  of the cable  36   a . The guiding unit  46   a  is in the assembled state configured for guiding the at least one conduction element  48   a  to the plug element  22   a . The at least one conduction element  48   a  is in the present example an optical fiber, in particular an optical waveguide, of the cable  36   a.    
     The guiding unit  46   a  is moreover configured to delimit a bending radius of the conduction element  48   a  in the inner housing  16   a  to a minimum radius. In the example shown the guiding unit  46   a  is configured to delimit the bending radius of the conduction element  48   a  in the inner housing  16   a  to at least a fifteen-fold of a conduction diameter of the conduction element  48   a.    
     For a guidance of the conduction element  48   a , in particular to the plug element  22   a , the first inner housing element  18   a  comprises a guiding subchannel  50   a . For a guidance of a further conduction element  54   a  of the cable  36   a , in particular to the plug element  22   a , the first inner housing element  18   a  comprises a second guiding subchannel  52   a . The second inner housing element  20   a  comprises guiding subchannels which are identical to the guiding subchannels. 
     The guiding subchannel  50   a  and the second guiding subchannel  52   a  are part of the guiding unit  46   a . The guiding subchannel  50   a  and the second guiding subchannel  52   a  are configured, in particular in a pre-assembled state, to hold the conduction element  48   a  and the further conduction element  54   a  in a mounting position. The guiding subchannel  50   a  and the second guiding subchannel  52   a  are moreover configured to prevent an undulation of the conduction element  48   a  and the further conduction element  54   a , in particular at low temperatures. 
     The first inner housing element  18   a  comprises in the guiding subchannel  50   a  a holding element  80   a  for holding the conduction element  48   a . The second inner housing element  20   a  comprises in the second guiding subchannel  50   a  a holding element  80   a  for holding the further conduction element  54   a.    
     The holding elements  80   a  are in particular configured for fixing the conduction element  48   a  and the further conduction element  54   a , in particular in the axial direction. The holding elements  80   a  prevent the conduction element  48   a  and the further conduction element  54   a  from being pushed out of a cable jacket of the cable  36   a . The holding elements  80   a  are realized as flexible tabs, which are configured to clamp the conduction element  48   a  and the further conduction element  54   a  in the assembled state. 
     In  FIGS. 7 to 16  four further exemplary embodiments of the invention are shown. The following descriptions and the drawings are essentially limited to the differences between the exemplary embodiments, wherein principally, regarding identically denominated components, in particular regarding components having the same reference numeral, the drawings and/or the description of the other exemplary embodiments, in particular of  FIGS. 1 to 6 , may be referred to. In order to distinguish between the exemplary embodiments, the letter a has been added to the reference numerals of the exemplary embodiment of  FIGS. 1 to 6 . In the exemplary embodiments of  FIGS. 7 to 16  the letter a has been replaced by the letters b to e. 
       FIGS. 7 and 8  show a plug connector device  10   b  of a further exemplary embodiment of the invention. The plug connector device  10   b  comprises an inner housing  16   b . The inner housing  16   b  comprises a first inner housing element  18   b . The inner housing  16   b  furthermore comprises a second inner housing element  20   b.    
     The plug connector device  10   b  comprises two plug elements  22   b . In the assembled state, the first inner housing element  18   b  and the second inner housing element  20   b  are configured to receive the two plug elements  22   b.    
     The first inner housing element  18   b  and the second inner housing element  20   b  comprise a receiving section  24   b . In the assembled state, the first inner housing element  18   b  forms together with the second inner housing element  20   b  a hollow receiving stud  30   b  in the receiving section  24   b . The receiving section  24   b  is configured to receive a fixing element  26   b.    
     The inner housing  16   b  comprises a reinforcement element  44   b . The reinforcement element  44   b  is embodied as a metal sleeve. In the assembled state, the reinforcement element  44   b  is arranged in the receiving section  24   b  between the first inner housing element  18   b  and the second inner housing element  20   b , in particular within the receiving stud  30   b.    
     The first inner housing element  18   b  has a fixing contour  42   b  in the receiving section. Furthermore, the second inner housing element  20   b  has a fixing contour  42   b  in the receiving section  24   b . The fixing contour  42   b  comprises a plurality of radial elevations. 
     The fixing element  26   b  has a further fixing contour  104   b  on its outer side. The further fixing contour  104   b  serves for receiving a tool, in particular a crimping tool, in a force-fit and/or form-fit manner. The receiving stud  30   b  has a narrowly tapering end, in particular a bevel  102   b.    
       FIGS. 9 and 10  show a plug connector device  10   c  of a further exemplary embodiment of the invention. The plug connector device  10   c  comprises an inner housing  16   c . The inner housing  16   c  comprises a first inner housing element  18   c . The inner housing  16   c  further comprises a second inner housing element  20   c.    
     The first inner housing element  18   c  and the second inner housing element  20   c  comprise a receiving section  24   c . In the assembled state, the first inner housing element  18   c  forms together with the second inner housing element  20   c  a hollow receiving stud  30   c  in the receiving section  24   c . The receiving section  24   c , in particular the hollow receiving stud  30   c , is configured to receive a fixing element  26   c.    
     The inner housing  16   c  comprises a reinforcement element  44   c . The reinforcement element  44   c  is embodied as a metal sleeve. In the assembled state, the reinforcement element  44   c  is arranged in the receiving section  24   c  between the first inner housing element  18   c  and the second inner housing element  20   c , in particular within the receiving stud  30   c.    
     The fixing element  26   c  comprises a cable claw  38   c . In the assembled state, the cable claw  38   c  claws a cable jacket  40   c  of a cable  36   c . The cable claw  38   c  is realized as a radial projection in the interior of the fixing element  26   c . In the example shown the fixing element  26   c  has two regions, which have different diameters. The cable claw  38   c  is arranged in an end of the plug connector  12   c  that is situated opposite a plugging side of the plug connector  12   c.    
       FIG. 11  shows a plug connector device  10   d  of a further exemplary embodiment of the invention. The plug connector device  10   d  comprises an inner housing  16   d . The inner housing  16   d  comprises a first inner housing element  18   d . The inner housing  16   d  further comprises a second inner housing element  20   d.    
     The inner housing  16   d  comprises a centering unit  106   d . The centering unit  106   d  serves for a centering during assembly of the plug connector device  10   d , in particular for a centering of plug elements of the plug connector device  10   d . In particular, the centering unit  106   d  prevents an erroneously oriented plug connection. 
     A first centering element  108   d  of the centering unit  106   d  is arranged on the first inner housing element  18   d . A second centering element  110   d  of the centering unit  106   d  is arranged on the second inner housing element  20   d.    
     The first centering element  108   d  and the second centering element  110   d  are in each case realized so as to be removable. In the example shown, the first centering element  108   d  and the second centering element  110   d  respectively latch at the first inner housing element  18   d  and at the second inner housing element  20   d  in an assembled state. Alternatively, the first centering element  108   d  and the second centering element  110   d  could be connected integrally to the first inner housing element  18   d  and the second inner housing element  20   d.    
     The implementation of the centering unit  106   d  is not limited to the present exemplary embodiment. In particular, the modular centering unit may be part of the plug connector devices  10   a - c  of the preceding exemplary embodiments. 
       FIGS. 12 to 15  show a plug connector device  10   e  of a further exemplary embodiment of the invention. The plug connector device  10   e  differs from the plug connector devices of the preceding exemplary embodiments of the invention in regard to a fixing element  26   e  of the plug connector device  10   e . In particular, the implementation of the fixing element  26   e  described below is also applicable to the plug connector devices of the preceding exemplary embodiments. 
       FIGS. 12 and 13  show a portion of the plug connector device  10   e  with the fixing element  26   e  in a pre-assembled state, i. e. in a pre-crimped state.  FIGS. 14 and 15  show the portion of the plug connector device  10   e  with the fixing element  26   e  in an assembled state, i. e. in a fully crimped state. In the pre-assembled state and in the assembled state (cf.  FIGS. 12 to 15 ), the fixing element  26   e  has a first cross section  112   e  with a first inner diameter. Furthermore, in the assembled state, the fixing element  26   e  has at least one second cross section  114   e  with a second inner diameter that substantially differs from the first diameter (cf.  FIGS. 14 and 15 ). In the example shown, the first inner diameter of the first cross section  112   e  is greater than the second diameter of the second cross section  114   e  by 16%. Between the fixing element  26   e  and a receiving section  24   e  of a first inner housing element  18   e  and/or of a second inner housing element  20   e  of the plug connector device  10   e , a strength element  34   e  of a cable  36   e  is arranged. 
       FIG. 16  illustrates a method  200   e  for producing a plug connector device  10   e . In a first step  202   e  of the method  200   e , a fixing element  26   e  of the plug connector device  10   e  is crimped by means of a first crimp stage to an outer measurement  116   e  of a fixing contour  42   e  of a receiving section  24   e  of a first inner housing element  18   e  and/or of a second inner housing element  20   e  of the plug connector device  10   e  (cf. also  FIGS. 12 and 13 ). In the first step  202   e  furthermore a strength element  34   e  of a cable  36   e  is arranged between the fixing contour  42   e  and the receiving section  24   e.    
     In a second step  204   e  of the method  200   e , the fixing element  26   e  is crimped by means of a second crimp stage to an inner measurement  118   e  of the fixing contour  42   e  (cf. also  FIGS. 14 and 15 ). 
     REFERENCE NUMERALS 
     
         
           10  plug connector device 
           12  plug connector 
           14  outer housing 
           16  inner housing 
           18  first inner housing element 
           20  second inner housing element 
           22  plug element 
           24  receiving section 
           26  fixing element 
           28  axial direction 
           30  receiving stud 
           32  adjoining surface 
           34  strength element 
           36  cable 
           38  cable claw 
           40  cable jacket 
           42  fixing contour 
           44  reinforcement element 
           46  guiding unit 
           48  conduction element 
           50  guiding sub-channel 
           52  second guiding sub-channel 
           54  further conduction element 
           56  bushing 
           58  inner thread 
           60  cable screwing 
           62  tool holder 
           64  outer thread 
           66  sealing element 
           68  cable tie 
           70  sleeve 
           72  sliding collar 
           74  groove 
           76  actuation element 
           78  pin 
           80  holding element 
           82  connection cable 
           84  coding member 
           86  spring element 
           88  O-ring 
           90  recess 
           92  closure 
           94  fixing member 
           96  first sub-stud 
           98  second sub-stud 
           100  latching member 
           102  bevel 
           104  further fixing contour 
           106  centering unit 
           108  centering element 
           110  further centering element 
           112  first cross section 
           114  second cross section 
           116  outer measurement 
           118  inner measurement 
           200  method 
           202  first step 
           204  second step