Plug connector on shock absorber

Abstract

The invention relates to a plug coupling on a shock absorber, comprising a plug and a plug socket, one of the two elements being axially mounted in a hollow piston rod having an inner multi-tooth profile, an outer multi-tooth profile of the other element engaging into the inner multi-tooth profile and thereby achieving an anti-rotation, the inner multi-tooth profile and / or the outer multi-tooth profile have / has asymmetry within the respective profile.

Description

Technical Field

[0001] The invention relates to a plug coupling according to the preamble of claim 1 . Background Art

[0002] Patent document DE 10 2021 201 888 A1 shows a shock absorber with an adjustable damping valve, which is supplied with energy via a line in a hollow piston rod. The end of the piston rod on the outside relative to the working cylinder is provided with a plug coupling, through which the external line is connected to the line in the piston rod.

[0003] The plug coupling comprises a rotatably mounted plug which is automatically rotationally aligned when the plug socket is introduced into the piston rod, so that the plug socket can be placed onto the pins of the plug.

[0004] In order to prevent the plug socket from rotating relative to the piston rod, the piston rod has an inner multi-toothed profile, into which an outer multi-toothed profile on the housing of the plug socket engages.

[0005] When closing the plug coupling, it often happens that the housing of the plug socket cannot be aligned precisely with its outer multi-toothed profile in cooperation with the inner toothed profile. Visual inspection during manual assembly movements is made more difficult by the bearing housing of the vibration damper surrounding the plug coupling. In addition, the relatively small bearing housing limits the free space for correcting the angular alignment of the housing. Summary of the invention

[0006] The object of the invention is to assist the closing process of the plug coupling and to prevent the plug coupling from getting stuck.

[0007] This object is achieved in that the inner multi-toothed profile and / or the outer multi-toothed profile have an asymmetry within the respective profile.

[0008] The biggest advantage is that when the outer multi-tooth profile is pushed into the inner multi-tooth profile, only a small radial overlap occurs between the two elements of the plug coupling, which could lead to a jamming of the two elements. Due to the initial point contact, only minimal rotational or rocking movements are required to push the outer multi-tooth profile into the inner multi-tooth profile.

[0009] One measure for producing the asymmetry can be that the inner multi-tooth profile has a plurality of intersecting tooth flanks which form tooth grooves with a tooth flank angle, wherein the tooth flank angle at at least one pair of tooth flanks is greater than the tooth flank angle of the outer multi-tooth profile. As a result, the circumferential play is very small, but the circumferential play has no effect on the anti-rotation function of the plug connector.

[0010] In another structural design, the larger tooth surface angle is designed asymmetrically about the symmetry axis between the intersection of the two tooth surfaces and the cross-sectional center point of the inner multi-tooth profile. In the case of this angle shape, the probability that the outer multi-tooth profile is more easily engaged in the inner multi-tooth profile is significantly greater than in the case of a symmetrical angle shape.

[0011] Additionally, the outer end surface of the inner multi-tooth profile can be designed to be inclined in the direction of the longitudinal axis of the inner tooth profile, thereby facilitating the sliding movement between the elements of the plug coupling.

[0012] The same effect can also be achieved if a transition profile is provided between the tooth flanks and the end face of the inner multi-tooth profile, which is inclined in the direction of the tooth flanks. The inclination of the end face in combination with the transition profile produces particularly good results.

[0013] According to an advantageous dependent claim, the outer multi-tooth profile is formed by axially extending profile webs, wherein at least one circumferential angle between two adjacent profile webs deviates from a second circumferential angle at the other pair of profile webs. By this measure, the outer multi-tooth profile is also designed to be asymmetrical. In principle, the asymmetry at the inner multi-tooth profile and the asymmetry at the outer multi-tooth profile can be used independently of one another.

[0014] Additionally, the shape of a single profiled connecting piece may also be different from that of another profiled connecting piece. The profiled connecting piece has two intersecting tooth cover surfaces that form a tooth angle, wherein the tooth angle at one profiled connecting piece is greater than the tooth angle at another profiled connecting piece.

[0015] Here too, there is the possibility of an additional asymmetry by designing the tooth angles to be larger in an asymmetrical manner with respect to the axis of symmetry between the profiled part web and the center axis of the outer multi-toothed profile.

[0016] Particularly good results are achieved with regard to the ease of assembly of the plug coupling if the asymmetry of the tooth flank angle and the asymmetry of the tooth angle are designed in opposite directions.

[0017] Another advantageous measure is that the profiled part connecting piece has different axial distances from the end face of the end side of the inner multi-toothed profiled part, thereby achieving that the profiled part connecting piece is successively engaged according to the insertion depth of the outer multi-toothed profiled part into the inner multi-toothed profiled part, and thus avoiding jamming.

[0018] It has proven advantageous for the shaped part webs to have different axial lengths. By means of the different lengths of the shaped part webs, a common end level of the shaped part webs can be achieved, so that when the plug coupling is closed, no tilting movement occurs between the elements.

[0019] Asymmetry is also generated at the end face of the molded part connecting piece, in that the molded part connecting piece has an introduction bevel in the entry direction toward the inner multi-tooth molded part, wherein the inclination angle of the introduction bevel at one of the molded part connecting pieces between the end face of the end side of the inner multi-tooth molded part and the molded part connecting piece is greater than the inclination angle at the other molded part connecting pieces.

[0020] The profiled web that is at the greatest distance from the end face has the largest inclination angle. There is no significant alignment function at the profiled web that is joined last. On the other hand, the aim is to avoid any risk of jamming.

[0021] In order to be able to manufacture the plug connector very easily by injection molding technology, the arrangement of the molded part elements is optimized. On the element with the molded part web, at least one axial rotating web is arranged in front of the outer multi-toothed molded part, which engages in the rotating molded part of the other element, wherein the rotating web has two opposite side surfaces, wherein the rotating web and the nearest molded part web form an angle of less than / equal to 180° with their outer side surfaces and their outer tooth cover surfaces. The main transverse axis of the element extends through the molded part web on the one hand and through the equatorial point of the plug element opposite the molded part web, wherein the molded part web is arranged directly between the two rotating webs when viewed in the circumferential direction. The outer side surfaces and the outer tooth cover surfaces each form a same-side internal angle of less than or equal to 90° with the main transverse axis. As a result, an injection mold can be formed from two components with a parting seam without a slide. The parting seam is located on the main transverse axis.

[0022] In order to be able to easily release the plug coupling again when necessary, at least one of the rotary lugs has an inclined surface which descends radially outwards on its end face facing the outer multi-tooth profile. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The invention is explained in more detail with reference to the following description of the figures.

[0024] Figure 1 A detail of an adjustable shock absorber is shown.

[0025] Figure 2 Shows Figure 1 The piston rod as a single piece,

[0026] Figure 3 and Figure 4 The plug connector is shown in two views,

[0027] Figure 5 and Figure 6 Shown according to Figure 1 An alternative forming part shape of the inner multi-tooth forming part of the piston rod,

[0028] Figure 7 The top view of the inner multi-tooth forming part viewed from above the piston rod is shown.

[0029] Figure 8 A highly sectional view of the outer multi-tooth profile of a plug and socket is shown,

[0030] Fig. 9 A cross-sectional view showing a closed plug connector,

[0031] Fig.10 A detailed diagram showing the outer multi-tooth forming part,

[0032] FIG. 11A to FIG. 11C A diagram showing the closing process of the plug coupling,

[0033] Fig.12 A cross-sectional view of an injection mould for manufacturing a plug and socket is shown. DETAILED DESCRIPTION

[0034] Figure 1 A detail of an adjustable shock absorber 1 is shown. The hydraulic damping valve device is not shown. A hollow piston rod 5 is guided in a cylinder 3 in an axially movable manner, which piston rod serves in particular as a longitudinal channel 7 for a line 9 of an electric coil 11. The coil 11 comprises a coil base 13 and a winding 15, which is only shown schematically. A pot-shaped coil housing 17 is fixed to the hollow piston rod 5, which accommodates the coil 11.

[0035] The coil housing 17 is fixed to the hollow piston rod 5 by means of a welding process which limits the heat locally. Preferably, a laser welding process is used.

[0036] Figure 2 The hollow piston rod 5 is shown in which a plug 19 connected to the line 9 is arranged in the region of the end of the piston rod remote from the coil housing 17. The line 9 has a second line socket 21 for connection to a plug coupling (not shown) of the coil housing 17.

[0037] The first plug 19 and the line socket 21 are supported in the piston rod 5 in an axially fixed manner but rotatable in the circumferential direction. The piston rod 5 comprises a tubular section 23 with a constant cross section. A piston rod journal 25 is welded to the tubular section 23, in which the plug 19 is arranged. The plug 19 is received in Figure 3 and Figure 4 Plug and socket (socket) 27 shown in FIG. 1 and thus establishes a connection between coil housing 17 and an onboard electrical system of a motor vehicle (not shown).

[0038] Figure 3 and Figure 4The first plug coupling 29 is shown in different views with a plug 19 as a coupling element in the hollow piston rod 5 and a plug socket 27 which can be inserted into the piston rod 5 .

[0039] The plug 19 has an end-side profile sleeve 31 with a curved profile 33 with a first upper deflection contour 35 and a second upper deflection contour 37, wherein the curved profile begins at the highest point within the deflection contours 35, 37 and ends in guide grooves 39, 41 arranged axially deeper. The variant shown has two deflection contours 35, 37 that are opposite to each other with respect to the longitudinal axis of the plug coupling 29. As in particular Figure 4 As shown, the deflection contours 35 , 37 differ in their course, so that an asymmetry exists within the plug coupling 29 .

[0040] When the plug socket 27 is rotated to align the plug 19 as required, the axially extending rotating connecting pieces 43, 45 of the plug socket 27 engage in the guide grooves 39, 41. The rotating connecting pieces 43, 45 are arranged on the peripheral side surface 47 outside the corresponding sleeve 49 of the plug socket 27. The outer diameter of the peripheral side surface 47 is smaller than the inner diameter of the molded sleeve 31, so that the corresponding sleeve 49 can be pushed into the molded sleeve 31. The axially extending rotating connecting pieces 43, 45 form a larger diameter with their radial outer surfaces 51, 53 than the inner diameter of the molded sleeve 31. This ensures that the corresponding molded part 55 on the end side of the rotating connecting pieces 43, 45 always slides on the curved molded part 33 until it can engage in the guide grooves 39, 41. From Figure 3 and Figure 4 It can be seen that the plug socket 27 has two axially extending rotational lugs 43 , 45 arranged opposite each other.

[0041] The counter sleeve 49 has a longitudinal section with a larger diameter relative to the circumferential side surface 47 with the axially extending rotary connecting pieces 43, 45 in the direction of the line housing 57 of the plug socket 27, which has a multi-toothed profile 59 that engages in a multi-toothed hollow profile 61 of the piston rod 5. When the outer multi-toothed profile 59 engages in the inner multi-toothed profile 61, the plug socket 27 is fixed in the circumferential direction and can only move axially in the piston rod 5.

[0042] The axially extending rotating connecting pieces 43, 45 are formed with a counter-shaped part 55 for sliding movement on the curved shaped part 33. The counter-shaped part 55 and the curved shaped part 33 are at least partially in contact during the connecting movement of the two coupling elements and generate a torque between the two coupling elements 19, 27.

[0043] When the axially extending rotational connecting pieces 43 , 45 engage in the guide grooves 39 , 41 , a correct correspondence of the plug 19 to the plug socket 27 is established.

[0044] In addition to or as an alternative to the asymmetry between the profile sleeve 31 and the counter sleeve 49 , the inner multi-tooth profile 59 and / or the outer multi-tooth profile 61 may have an asymmetry within the respective profile.

[0045] exist Figure 5 and Figure 6 In FIG. 1 , the end of the piston rod 5 which is located on the outside relative to the shock absorber 1 is shown in a sectional view. Figure 5 It can be seen that every two cut tooth surfaces 63, 65 form a tooth 67 and a tooth groove 69. Each tooth 67 of the inner multi-tooth profile 61 ends at an outer end surface 71. Between the tooth surfaces 63, 65 and the end surface 71 of the inner multi-tooth profile 61, there is a transition profile 73 inclined in the direction of the tooth surfaces. The transition profile 73 can be formed at a radius or an oblique angle at each tooth surface 63, 65 and thus facilitates the sinking of the outer multi-tooth profile 59 into the inner multi-tooth profile 61. Additionally or alternatively, the outer end surface 71 of the inner multi-tooth profile 61 can be designed to be inclined at an angle α in the direction of the longitudinal axis 75 of the inner multi-tooth profile 61, such as Figure 6 To better see the details, Figure 5 and Figure 6 The two variants are shown separately in FIG.

[0046] Figure 7 61 and its tooth flanks 63, 65. For at least one tooth groove 69, the intersecting tooth flanks 63, 65 form a tooth flank angle β, which is greater at at least one pair of tooth flanks than the other tooth flank angles of the outer multi-tooth profile 59, as shown in FIG. 2 , which shows a high-profile cross-section of the plug socket 27 in the region of the outer multi-tooth profile 59. Figure 8 It is clear when we observe together.

[0047] The larger tooth face angle β is designed asymmetrically with respect to the symmetry axis 77 between the intersection of the two tooth flanks 63 , 65 and the cross-sectional center of the inner multi-tooth profile 61 , more precisely the longitudinal axis 75 . β1>β2 holds true, wherein the larger tooth face angle β1 is located to the right relative to the symmetry axis 77 .

[0048] exist Figure 8As can be seen in the figure, the outer multi-toothed profile 59 of the plug socket 27 is formed by axially extending profiled portion connecting pieces 81-85, wherein at least one circumferential angle δ1 between two adjacent profiled portion connecting pieces 81, 83 deviates from a second circumferential angle δ2 at another pair of profiled portion connecting pieces 83, 85. The deviation is not large, because the outer multi-toothed profile 59 should of course be engaged in the inner multi-toothed profile 61.

[0049] For the external multi-tooth profile 59 , the profile webs 81 - 85 also have two intersecting tooth cover surfaces 87 , 89 , which form tooth tops with a tooth angle γ, wherein the tooth angle γ1 at one profile web 81 is greater than the tooth angle γ2 at another profile web, such as the profile web 83 .

[0050] Comparable to the design of the internal tooth profile 61, the larger tooth angle γ here is also designed asymmetrically with respect to the symmetry axis 91 between the tooth tip of the profiled part connecting piece and the center axis 93 of the outer multi-tooth profile 59. However, the asymmetry of the tooth face angle β and the asymmetry of the tooth angle γ are designed in the opposite way. 1.1 >γ 1.2 Established.

[0051] Fig. 9 A highly sectional view of a closed plug coupling 29 is shown. In this illustration, the clear top play between the inner multi-toothed profile 61 and the outer multi-toothed profile 59 is clearly visible. The two profiles 59, 61 do not touch in a planar manner, but in a linear manner. This results in a certain amount of play which, on the one hand, is small enough to enable a quick, jam-free assembly of the plug coupling 29, but, on the other hand, is sufficient to ensure protection against rotation.

[0052] Fig.10 The purpose is to show that the profiled connecting pieces 81-85 of the plug socket 27 have different axial distances and different axial lengths from the end face 71 of the inner multi-tooth profile 61. Instead of the end face 71 of the inner tooth profile, the end face of the rotating connecting pieces 43, 45 can also be used as a reference. As a result, the profiled connecting pieces 81-85 act in a path-dependent manner during the closing movement of the plug connector 29. The profiled connecting piece 81 with the shortest distance from the end face 71 first engages in the inner multi-tooth profile 61 of the piston rod 5. Therefore, clamping occurs only at this profiled connecting piece.

[0053] The profiled connecting pieces 81-85 have an introduction bevel 95 in the direction of entry toward the inner multi-toothed profile 61, wherein the inclination angle λ1 between the end faces 71 of the end side of the piston rod 5 of the introduction bevel 95 at the profiled connecting piece 81, for example, is greater than the inclination angle at the other profiled connecting pieces. As a result, a slight rotational movement of the plug socket relative to the piston rod, more precisely to the inner multi-toothed profile, occurs at the location where the profiles engage.

[0054] The profiled web 85 which is at the greatest distance from the end face 71 of the piston rod 5 has the greatest inclination angle λ. The more acute inclination angle λ2 of the shortest profiled web 85 serves primarily as an insertion aid.

[0055] exist FIG. 11A to FIG. 11C In the sequence of FIG. 1 , the closing movement between the inner multi-toothed profile 59 and the outer multi-toothed profile 61 of the plug coupling 29 is shown in stages.

[0056] exist Fig.11A In the figure, the plug socket 27 has been introduced into the hollow piston rod 5, but the inner multi-toothed profile 61 and the outer multi-toothed profile 59 have not yet engaged. The height section shows that the plug socket 27 cannot be pushed into the piston rod without clamping because the ends of the two multi-toothed profiles 59 and 61 overlap each other axially at the end side with their tooth profiles.

[0057] Fig. 11B The first engagement of the profiled connecting piece 83 with the tooth groove 69 of the inner multi-toothed profile 61 is shown. The tilt angle at the profiled connecting piece 83 causes a slight rotational movement and results in a closed plug connector (according to Fig. 11C ).

[0058] exist Fig.10 It can be clearly seen in the figure that, on the plug socket 27 having the profiled portion connecting pieces 81-85 as an element of the plug coupling 29, axially arranged rotating connecting pieces 43, 45 are located in front of the outer multi-tooth profile. At least one of the rotating connecting pieces 43, 45 has an inclined surface 97 that descends toward the radial outside at its end face facing the outer multi-tooth profile 59. During the removal movement of the plug socket 27 from the piston rod 5, the rotating connecting pieces 43, 45 retreat at the edge inside the piston rod 5 and thus prevent the plug socket 27 from getting stuck.

[0059] The rotating webs 43, 45 and the profiled webs 81-85 are not arranged indiscriminately relative to one another in the circumferential direction. Fig.122 shows an injection mold 99 for manufacturing the plug socket 27 in a greatly simplified manner. The rotating connecting pieces 43, 45 have two opposite side surfaces 101, 103, wherein the rotating connecting pieces 43, 45 and the nearest molded part connecting pieces 81, 85 form an angle less than / equal to 180° twice with the outer side surface 101 and the outer tooth cover surface 87.

[0060] The main transverse axis 105 of the element, more precisely the plug socket 27, extends through the molded web, for example the molded web 83, and through the equator 107 of the plug element, more precisely the plug socket 27, which is opposite the molded web 83. The main transverse axis 105 coincides with the parting seam of the injection mold 99. When viewed in the circumferential direction, the molded web 83 is arranged directly between the two rotating webs 43, 45. There are no further molded webs between the molded web 83 and the two rotating webs 43, 45 in the region of the main transverse axis 107.

[0061] The outer side surfaces 101 of the rotating webs 43, 45 and the outer tooth cover surfaces 87 each form a co-lateral inner angle 109 of less than or equal to 90° with the main transverse axis 105. Due to this arrangement rule, a particularly simple injection mold 99 having only one parting seam can be used.

[0062] Reference numerals

[0063] 1 Shock absorber

[0064] 3 Cylinder

[0065] 5 Piston rod

[0066] 7 Longitudinal channel

[0067] 9 lines

[0068] 11 Coil

[0069] 13 Coil substrate

[0070] 15 Winding

[0071] 17 Coil housing

[0072] 19 Plug

[0073] 21 Second line socket

[0074] 23 Tubular section of piston rod

[0075] 25 Piston rod journal

[0076] 27 Plugs and sockets

[0077] 29 Plug connector

[0078] 31 Forming sleeve

[0079] 33 Curve Forming Department

[0080] 35 Turning profile

[0081] 37 Turning profile

[0082] 39 Guide groove

[0083] 41 Guide groove

[0084] 43 Rotating connecting piece

[0085] 45 Rotating connecting piece

[0086] 47 Week Side

[0087] 49 corresponding sleeve

[0088] 51 External surface

[0089] 53 External surface

[0090] 55 Corresponding forming part

[0091] 57 Line Socket

[0092] 59 External multi-tooth forming unit

[0093] 61 Internal multi-tooth forming unit

[0094] 63 tooth surface

[0095] 65 tooth surface

[0096] 67 teeth

[0097] 69 Tooth groove

[0098] 71 outer end face

[0099] 73 Transition Forming Department

[0100] 75 Vertical axis

[0101] 77 Axis of symmetry

[0102] 79 Cross-section midpoint

[0103] 81 Forming part connecting piece

[0104] 83 Forming part connecting piece

[0105] 85 Forming part connecting piece

[0106] 87 Tooth cover surface

[0107] 89 tooth cover surface

[0108] 91 Axis of symmetry

[0109] 93 Central Axis

[0110] 95 Introducing the Incline

[0111] 97 Inclined surface

[0112] 99 Injection mold

[0113] 101 Side

[0114] 103 Side

[0115] 105 Main horizontal axis

[0116] 107 Equator Point

[0117] 109 Same as interior angle.

Claims

1. A plug connector (29) on a shock absorber (1), the plug connector comprising a plug (19) and a plug socket (27), wherein: One of the two elements (19, 27) is axially supported in a hollow piston rod (5), the piston rod having an inner multi-toothed profile (61), the outer multi-toothed profile (59) of the other element (27) engaging in the inner multi-toothed profile, thereby achieving anti-rotation, characterized in that the inner multi-toothed profile (61) and / or the outer multi-toothed profile (59) have asymmetry within the corresponding profile.

2. The plug connector (29) according to claim 1, characterized in that The inner multi-tooth profiled portion (61) has a plurality of intersecting tooth surfaces (63, 65), the tooth surfaces forming tooth grooves (67) having a tooth surface angle (β), wherein the tooth surface angle (β) at at least one pair of tooth surfaces (63, 65) is greater than the tooth surface angle (β) of the outer multi-tooth profiled portion (59).

3. The plug connector (29) according to claim 2, characterized in that The larger tooth surface angle (β) is designed asymmetrically with respect to a symmetry axis (77) between an intersection point of the two tooth surfaces (63, 65) and a cross-sectional center point (79) of the inner multi-tooth profile (61).

4. The plug coupling (29) according to any one of claims 1 to 3, characterized in that The outer end surface (71) of the inner multi-tooth profile (61) is designed to be inclined in the direction of the longitudinal axis (75) of the inner multi-tooth profile (61).

5. The plug coupling (29) according to any one of claims 1 to 4, characterized in that A transition profile (73) inclined toward the tooth surface (63, 65) exists between the tooth surface (63, 65) and the end surface (71) of the inner multi-tooth profile (61).

6. The plug coupling (29) according to any one of claims 1 to 5, characterized in that The outer multi-toothed forming part (59) is formed by axially extending forming part connecting sheets (81-85), wherein at least one circumferential angle (δ1) between two adjacent forming part connecting sheets (81, 83) deviates from a second circumferential angle (δ2) at another pair of forming part connecting sheets (83, 85).

7. The plug connector (29) according to claim 6, characterized in that The molded connecting piece (81-85) has two intersecting tooth cover surfaces (87, 89), which form a tooth angle (γ), wherein the tooth angle (γ1) at one molded connecting piece (81) is greater than the tooth angle (γ2) at another molded connecting piece (83, 85).

8. The plug coupling (29) according to claim 7, characterized in that The larger tooth angle (γ1) is designed asymmetrically with respect to an axis of symmetry (91) between the tooth tips and the center axis (93) of the outer multi-tooth profile (59).

9. The plug connector (29) according to claim 3 or 7, characterized in that The asymmetry of the tooth face angle (β) and the asymmetry of the tooth angle (γ) are designed to be opposite.

10. The plug coupling (29) according to any one of claims 6 to 9, characterized in that The profiled portion connecting pieces (81-85) have different axial distances from the end surface (71) of the end side of the inner multi-tooth profiled portion (61).

11. The plug coupling (29) according to any one of claims 6 to 10, characterized in that The shaped portion connecting pieces (81-85) have different axial lengths.

12. The plug coupling (29) according to any one of claims 6 to 11, characterized in that The molded part connecting piece (81-85) has an introduction bevel (95) in the direction of entry toward the inner multi-tooth molded part (61), wherein the inclination angle (λ2) of the introduction bevel (95) at one of the molded part connecting pieces (85) between the end face (71) on the end side of the inner multi-tooth molded part (61) and the molded part connecting piece (85) is greater than the inclination angles at the other molded part connecting pieces (81, 83).

13. The plug coupling (29) according to claim 12, characterized in that The shaped portion connecting piece (85) which is the largest distance from the end surface (71) has the largest inclination angle (λ).

14. The plug coupling (29) according to any one of claims 6 to 13, characterized in that At least one axially rotating connecting piece (43, 45) is arranged on the element (27) having the molded connecting piece (81-85) and is located in front of the outer multi-toothed molded part (59), and the rotating connecting piece is engaged in the rotating molded part (35, 37, 39, 41) of another element (17), wherein the rotating connecting piece (43, 45) has two opposite side surfaces (101, 103), wherein the rotating connecting piece (43, 45) and the nearest molded connecting piece (81, 85) are connected with their outer side surfaces (101, 103) and their outer tooth cover surfaces (87). An angle of less than / equal to 180° is formed, wherein the main transverse axis (105) of the element extends through the molded connecting piece (83) on the one hand and through the equatorial point (107) of the plug element (27) opposite the molded connecting piece (83), wherein, viewed in the circumferential direction, the molded connecting piece (83) is arranged directly between two rotating connecting pieces (43, 45), wherein the outer side surface (103) and the outer tooth cover surface (87) respectively form a same-side internal angle (109) of less than / equal to 90° with the main transverse axis (105) towards each other.

15. The plug coupling (29) according to any one of claims 1 to 14, characterized in that At least one of the rotating connecting pieces (43, 45) has an inclined surface (97) which descends toward the radial outside at its end surface facing the outer multi-tooth profile portion (59).

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