LED connector

Abstract

Connection element (10) for the electrical connection of an LED light source, - wherein the LED light source has a circuit board (13) which is provided with contact fields (15) for the electrical supply of an LED (14), - with a frame (24) which is designed to rest on a mounting surface (16) of a counter bearing (11) and to hold the circuit board (13) on this mounting surface (16), wherein the frame (24) is formed by an outer ring (19) and an inner ring (20), - with the inner ring (20), which is held inside the outer ring (19) and is designed to at least partially cover the circuit board (13) and to hold the circuit board (13) vertically to the mounting surface (16) on the counter bearing (11), - with the outer ring (19) which is designed to surround the circuit board (13) and to hold the circuit board (13) parallel to the mounting surface (16) on the counter support (11), - with locking lugs (29) formed by the inner ring (20), - with detent springs (21) arranged in the outer ring (19) that engage the detent lugs (29) of the inner ring (20) and exert a tensile force on the inner ring (20) in the direction of the arrangement surface (16), characterized in that - a spring receiving space for the detent spring (21) is provided, which extends in relation to the frame (24) resting on the mounting surface (16) into an area below the mounting surface (16), - the spring receiving space is formed by a dome (25) that originates from the underside of the outer ring (19).

Description

[0001] The invention relates to a connection element for the electrical connection of an LED light source, - wherein the LED light source has a circuit board which is equipped with contact fields for the electrical supply of the LED, - with a frame designed to rest on a mounting surface of a counter bearing and to hold the printed circuit board on this mounting surface, wherein the frame is formed by an outer ring and an inner ring, - with the inner ring, which is held inside the outer ring and is designed to at least partially cover the circuit board and thus hold the circuit board vertically to the mounting surface on the counter bearing, - with the outer ring, which is designed to surround the circuit board and hold the circuit board parallel to the mounting surface on the counter bearing, - with locking lugs formed by the inner ring, - with detent springs arranged in the outer ring, which overlap the detent lugs of the inner ring and exert a tensile force on the inner ring in the direction of the mounting surface.

[0002] Connection elements for the electrical connection of an LED light source and for simultaneous mechanical fastening are known, for example, from EP 2 083 489 A1 of the applicant. A component that is ring-shaped in the broadest sense has an integrated contact arrangement which enables the connection of external conductors and transfers the supplied electricity to contact fields of a printed circuit board equipped with LEDs.

[0003] The ring-shaped component simultaneously covers the circuit board. For this purpose, the component has a central recess that accommodates the circuit board.

[0004] Using suitable fasteners such as screws, expansion anchors, etc., the ring-shaped component is fixed to a counter support, usually a heat sink or a light plate, thus holding the circuit board between itself and the counter support.

[0005] In this way, the LED light source is mechanically fixed and electrically connected to a suitable power supply.

[0006] These types of connection elements are widely used in the manufacture of modern luminaires using LED light sources and have been further developed compared to the embodiment shown in the aforementioned publication.

[0007] In particular, the dimensions of the contact assembly have been minimized to make the connection element as flat as possible in terms of its height measured in the direction of light emission. This prevents the connection element from shading the light emitted from the LED, which significantly improves the efficiency of the light source.

[0008] Furthermore, optics and reflectors mounted on the connection element can be positioned closer to the light emission plane of the LED. This significantly improves the efficiency of the reflectors and optics.

[0009] The applicant has published a further development of such connection elements, corresponding to the general term, under application number DE 20 2023 105 716 U1. In this publication, for reasons of improved logistics, the ring-shaped connection element is divided into an inner ring and an outer ring. The outer ring serves to fix the printed circuit board parallel to a mounting surface of the counter bearing. The inner ring is inserted into the outer ring and covers at least part of the printed circuit board. In this way, the inner ring secures the printed circuit board vertically to the mounting surface on the counter bearing. In this embodiment as well, the connection element has a contact arrangement that enables the electrical connection of the printed circuit board to external conductors.

[0010] DE 20 2022 105 271 U1 shows a non-general solution in which the circuit board of an LED light source is attached directly to a heat sink via snap-in clips, i.e. without an intermediary ring element.

[0011] For the mechanical mounting, electrical supply, and safe operation of an LED light source, a number of detailed requirements must be considered. The thickness of the circuit boards – measured in the direction of light emission or perpendicular to the mounting surface – is subject to considerable variations.

[0012] The circuit boards must be pressed onto the counter-support with a certain amount of pressure to ensure optimized heat dissipation. Only with sufficient dissipation of the operating heat generated by the LED is the longevity of the LED light source guaranteed.

[0013] To optimize heat transfer from the circuit board to the mounting surface, various types of thermal interface materials are applied between the circuit board and the mounting surface. These range from thermal pastes to relatively thick thermal pads. The lighting manufacturer typically selects the thermal interface material they deem most suitable. The mounting element must also be able to compensate for the additional thermal interface layer.

[0014] Finally, it is important to ensure that the contact forces between the contact fields of the printed circuit board and the contact arrangement of the connection element are optimized for the lowest possible electrical contact resistance. In a two-part connection element, as described in the present invention, the contact arrangement comprises a connection contact located in the outer ring, to which the connecting conductors are attached. The inner ring carries a supply contact that rests on the contact field of the printed circuit board.

[0015] The connection contact and the supply contact also have mutual contact surfaces to ultimately enable the supply of electricity. Therefore, in the two-part connection element according to the invention, it is also important to ensure that the contact forces between the connection contact and the supply contact are optimized for the lowest possible contact resistance.

[0016] The object of the invention is therefore to create a suitable detent spring arrangement for a two-part connecting element which, taking into account the required tolerance compensation, ensures sufficient contact forces of the inner ring on the circuit board.

[0017] The problem of the invention is solved by a connecting element with the features of claim 1, in particular with its characterizing features, according to which a spring receiving space for the detent spring is provided, which extends in relation to the frame resting on the arrangement surface to an area below the arrangement surface.

[0018] To compensate for high tolerances regarding the thickness of the printed circuit board and any thermal interface material located between the circuit board and the counter bearing, it is necessary that the inner ring can perform a comparatively large stroke vertically to the mounting surface of the counter bearing or in the direction of light emission from the LED. At the same time, the detent spring must be able to exert sufficient contact forces towards the mounting surface in every position of the inner ring caused by the tolerances.

[0019] This requires a detent spring capable of a relatively large travel and sufficient clamping force. Space must be created within the connector to accommodate this large travel. Specific dimensions of the detent spring element are necessary to achieve high spring forces. These requirements for a detent spring contradict the technical need to create connectors with the lowest possible profile to prevent the connector from obstructing the emerging light.

[0020] The invention provides for relocating the required installation space for the detent spring to an area below the plane of the counter bearing, or at least extending it into this area. In this way, the thickness of the connecting element, measured in the direction of light emission or vertically to the plane of the counter bearing, can be reduced to the absolute minimum. Shadowing of the emitted light by the connecting element is reliably avoided or significantly reduced. Nevertheless, sufficient installation space is provided for a detent spring element, which, due to the spring forces to be applied and, in particular, the required spring travel, requires a sufficiently large spring mounting space.

[0021] The invention provides that the spring receiving chamber is formed by a dome that originates from the underside of the outer ring and is directed, in particular, against the direction of light emission. The spring element can be arranged in this dome and thus, especially in the case of a spring element shown in the exemplary embodiment with a pivot axis aligned parallel to the mounting surface, has sufficient space for the required spring travel.

[0022] In another alternative embodiment, the spring mounting space is formed by a cavity in the counter bearing. For example, a corresponding cavity or recess – whether designed as a blind hole or a through bore – can be provided in a heat sink. A detent spring seated here thus has sufficient installation space and room to generate large spring travel.

[0023] In a particularly preferred embodiment, the dome of the outer ring, which forms the spring mounting chamber, is seated in the cavity of the counter bearing. In this way, the dome formed by the outer ring is well protected against mechanical damage by the surrounding material of the counter bearing, in particular the heat sink.

[0024] To withstand high spring forces, a sufficient material thickness is required, especially for an inner ring made of plastic, in the area where it interacts with the detent spring. Specifically, the detent projection must be sufficiently robust to prevent plastic deformation under the influence of the detent spring's forces.

[0025] However, this means that space must be created for a correspondingly thick layer of material, which – as discussed above – contradicts the requirements for flat connection elements in particular.

[0026] The invention therefore additionally proposes that the inner ring forms a spring support leg which carries the detent projection. In particular, it is provided that the spring support leg projects into the spring receiving space and rests against a wall that delimits the spring receiving space.

[0027] The invention has recognized that the spring receiving space creates space to provide a detent projection sufficiently dimensioned to accommodate the spring forces, without this adversely affecting the dimensioning of the part of the connecting element located above the arrangement surface.

[0028] Furthermore, the invention recognizes that the detent projection can be kept comparatively small in its dimensions if it rests against and is supported by a wall bounding the spring chamber. In this way, the wall bounding the dome or the cavity is used to absorb the forces acting on the detent projection. Thus, the spring support leg forming the detent projection can be dimensioned less, since the spring forces are also absorbed by the respective wall.

[0029] In a particularly preferred embodiment, the spring support leg rests against the wall forming the dome, which in turn is supported by the wall bounding the cavity. Since the counter bearing is generally made of a metal, in particular aluminum, the components dome and spring support leg, made of the plastic material of the inner and outer rings, are very effectively supported against a more stable material in a load-distributing manner.

[0030] The invention further recognizes that the detent spring for holding the inner ring is also suitable for securing the outer ring to the counter bearing. In this way, the detent spring of the outer ring acquires a dual purpose.

[0031] Especially when the counter bearing is a cooling sink, undercuts often occur when drilling the holes for the cavity in the area of ​​the cooling fins, into which the detent spring can engage to fasten the outer ring to the counter bearing.

[0032] Alternatively, the dome of the outer ring could be designed like an expansion dowel. For this purpose, the dome could, for example, be slotted vertically to the mounting surface. An expansion element deflects the dome walls, allowing them to engage the counter bearing via friction and / or a positive fit. Undercuts created by drilling holes in a heat sink in the area of ​​the cooling fins are also suitable for this application.

[0033] The invention will now be explained in more detail using two exemplary embodiments, which will reveal further advantages and features. The following are shown: Fig. 1 a connection element according to the invention supplemented by LED light source and a counter bearing in exploded view, Fig. 2 the assembly after Fig. 1 in compound form, Fig. 3 the assembly after Fig. 2 in top view, Fig. 4 a sectional view of the assembly according to section line AA in Fig. 3, Fig. 5 a sectional view of the assembled component in Fig. 3 according to section line AA, Fig. 6 an exploded view of an alternative embodiment of the invention, Fig. 7 a top view of the embodiment according to Fig. 6, Fig. 8 a section view according to section line BB as in Fig. 6.

[0034] In the figures, an assembly using the connection element 10 according to the invention is provided with the reference numeral 100.

[0035] The assembly 100 includes, in addition to the counter bearing 11 in the form of a heat sink 12, a circuit board 13. The circuit board 13 is equipped with an LED 14 and also carries contact fields 15.

[0036] The counter bearing 11 has an arrangement surface 16 aligned with the circuit board 13, which is perforated by threaded bores 17 and cavities 18.

[0037] The connecting element 10 comprises an outer ring 19 and an inner ring 20 and also has detent springs 21. The contact arrangement provided for the electrical supply of the circuit board 13 is not shown in the exemplary embodiments, as it plays only a subordinate role in the core of the invention.

[0038] Screw bolts 22 pass through fastening holes 23 of the outer ring 19 and are inserted into the threaded holes 17 of the cooling body 12 to fix the outer ring 19 to the cooling body 12.

[0039] The outer ring 19 forms a mounting frame 24 in which the circuit board 13 is to be inserted.

[0040] Domes 25 extend from the underside of the outer ring 19 facing the mounting surface 16. A receiving space 26 allows the inner ring 20 to be inserted into the outer ring 19. A vertical axis V, which is parallel to the direction of light emission or perpendicular to the mounting plane, forms the central axis of the connecting element 10.

[0041] Spring support legs 27 extend from the underside of the inner ring 20, which faces the mounting surface 16. In addition, the inner ring 20 forms a central light transmission opening 28 that surrounds the LED 14.

[0042] Fig. Figure 2 shows assembly 100 according to Fig. 1 in compound form. Here is the interaction of the in Fig. The components shown in Figure 1 are already partially recognizable. The outer ring 20 rests on the mounting surface 16 of the heat sink 12 with its underside facing the mounting surface 16. The screw bolts 22 are inserted into the mounting holes 23 and their threaded shanks engage in the threaded holes 17 of the heat sink 12, which are not visible here because they are covered by the outer ring 19. In this way, the outer ring 19 is firmly mounted on the heat sink 12 or counter bearing 11.

[0043] As can be imagined, the domes 25 originating from the underside of the outer ring 19 sit in the cavities 18 of the heat sink 12 so that the outer ring 19 can lie flat on the mounting surface 16.

[0044] The detent springs 21 are seated in their respective domes 25, with the spring support legs 27 also extending into their respective domes 25. In this way, the inner ring 20 can lie in the receiving space 26 of the outer ring 19 (not shown here) and surround the LED 14 with its light transmission opening 28 (not shown here).

[0045] Fig. Figure 3 shows a top view of assembly 100 according to Fig. 2 and serves in particular to determine the position of the section according to section line AA for the following described Fig. 4 and Fig. 5 to represent.

[0046] The Fig. 4 and Fig. Figure 5 shows a cross-sectional view through assembly 100, where Fig. 4 an exploded view of the section and Fig. Figure 5 is a sectional view of assembly 100 in its assembled state.

[0047] The section view according to Fig. Figure 4 shows the inner ring 20. Each spring support leg 27 forms a locking lug 29, which points radially outwards with respect to the light emission direction L or vertical axis V. Each locking lug 29 has a locking surface 30 facing the upper side away from the counter bearing 11 and a spreading surface 31 facing towards the counter bearing 11. Starting from a locking lug apex 32, which defines the maximum radial extension of the locking lug 29 outwards, the locking surface 30 rises as an inclined surface in the direction of the vertical axis V. The spreading surface 31, on the other hand, is formed as an inclined surface sloping downwards in the direction of the vertical axis V on the spring support leg 27.

[0048] Fig. Figure 4 also shows the detent springs 21. These initially comprise a spring leg 33, which has a detent 34 for anchoring in the outer ring 19, in particular within its dome 25. In this specific embodiment, the detent 34 is directed radially outwards and towards the upper surface of the connecting element 10, which points away from the counter bearing 11. However, this is not a strict requirement for the function of the detent 34. In this embodiment, the detent 34 also originates from the lower end of the spring leg 33, which faces the cooling element 12.

[0049] At its end facing the upper side of the connecting element 10, the spring leg 33 has a detent contour, designated with the reference numeral 35, which is directed radially inwards towards the inner ring 20. Starting from a detent contour apex 36, which defines the maximum radial inward position of the detent contour 35, a retaining leg 37 slopes obliquely towards the cooling sink 12 and terminates in the spring leg 33. Extending radially outwards from the detent contour apex 36 towards the upper side of the connecting element 10, a spreading leg 38 forms the free, upper end of the detent spring 21.

[0050] Fig. 4 also allows a detailed insight into the cathedral 25 of the outer ring 19.

[0051] Firstly, the dome 25 has an insertion opening 39 on the upper side of the connection element 10, which allows access to the interior of the dome 40. The interior of the dome 40 can be divided into various functional areas, as described below.

[0052] First, the dome interior 40 provides a spring support leg receptacle 41, into which the spring support leg 27 is inserted when the connecting element 10 is assembled (see Fig. 5) The spring support leg mount 41 is arranged radially inside the dome interior 40.

[0053] A locking leg receptacle 42 is provided radially outside the dome interior 40. This receptacle also forms a locking leg seat 43. The free end of the locking leg 34 rests against this locking leg seat 43 to anchor the locking spring 21 in the dome 25. The arrangement of the locking leg 34 in the locking leg receptacle 42, including the anchoring of the locking leg 34 in the locking leg seat 43, is made of Fig. 5 is visible.

[0054] A spring leg channel 44 is formed in the dome 25 between the spring support leg receptacle 41 and the locking leg receptacle 42. The spring leg channel 44 is limited towards the spring support leg receptacle 41 by a support wall 45, which prevents excessive radial inward displacement of the spring leg 33 towards the spring support leg. Towards the locking leg receptacle 42, the spring leg channel 44 is limited by a guide pin 46, which holds the lower end of the spring leg 33 securely in the spring leg channel 44 and prevents the spring leg 33 from slipping out into the locking leg receptacle 42.

[0055] The support wall 45 as well as the guide pin 46 are directed vertically to the arrangement surface of the counter bearing 11 or parallel to the vertical axis V, so that the functional spaces, namely the spring support leg receptacle 41, the locking leg receptacle 42 and the spring leg shaft 44 are vertically separated from each other and accessible via the insertion opening 39 of the dome 25.

[0056] From the overall view of Fig. 4 and Fig. Figure 5 shows how the assembly 100, in particular the connecting element 10, is assembled.

[0057] First, the detent springs 21 are inserted into their respective corresponding domes 25 against the direction of light emission L, i.e., from the top of the connecting element 10. The spring legs 33 then enter the spring leg shaft 44. Simultaneously, the detent leg 34 engages in the detent leg seat 43 of the detent leg receptacle 42. In this way, the detent spring 21 locks into the dome 25. The detent contour 35 of the detent spring 21 extends radially inwards in the direction of the vertical axis V into the spring support leg receptacle 41.

[0058] The outer ring 19 is now placed onto the heat sink 12, with the domes 25 being inserted into the cavities 18. In this way, the underside of the outer ring 19 facing the heat sink 12 comes to rest on the mounting surface 16 of the heat sink 12.

[0059] To assemble the component 100, the circuit board 13, i.e., the LED light source, is now inserted into the mounting frame 24 formed by the outer ring 19, so that the underside of the circuit board 13 also rests on the mounting surface 16 of the heat sink 12. Thermal conductors – not shown in the drawings – may also be arranged between the circuit board 13 and the heat sink 12.

[0060] Within the outer ring 19, the circuit board 13 is now securely held against horizontal or parallel displacement.

[0061] The inner ring 20 is now placed onto the outer ring 19 in the opposite direction of light emission L. The spring support legs 27 are inserted into their respective corresponding domes 25 and into the corresponding spring support leg receptacle 41. In this process, the spreading surfaces 31 of the respective locking lug 29 come into contact with the respective spreading leg 38 of the locking spring 21, the resulting inclined surface pairing 31 / 38 causing the locking contour 35 to shift radially outwards. This movement reaches its maximum when the apex of the locking contour 36 is aligned with the apex of the locking lug 32. Subsequently, with continued insertion in the opposite direction of light emission L, the retaining legs 37 engage with the respective locking surface 30 of the locking lug 29.The detent contour 35 shifts radially inwards with spring elasticity, whereby the inclined surface pairing 31 / 38 between the retaining leg 37 and the locking surface 30 applies a force component to the inner ring 20 directed towards the mounting surface 16. This clamps the inner ring 20 against the inserted circuit board 13 and ensures sufficient contact pressure of the circuit board 13 against the heat sink 12 to promote optimal heat dissipation. Similarly – not shown here – the aforementioned force component, which clamps the inner ring 20 towards the mounting surface 16, also promotes correct contact of the contact arrangement with the contact fields 15 of the circuit board 13 to achieve correct electrical contact values.

[0062] Due to the detent domes 25 extending into an area below the arrangement surface 16, a sufficiently large space is created to provide a spring element in the form of the detent spring 21, which is elongated in the direction of light emission L or parallel to the vertical axis V and which, via its longitudinal extension of the spring leg 33 within the spring leg shaft 44, offers sufficiently large spring travel for the retention of the inner ring 20 in the outer ring 19.

[0063] Fig. Figure 6 shows an exploded view of an alternative embodiment of the invention. Fig. The above also applies to the present illustration. Here, too, we are dealing with an assembly 100 with a connecting element 10, which holds an LED light source – consisting of a circuit board 13 with contact fields 15 and an LED 14 – on a counter bearing 11 in the form of a heat sink 12. The connecting element 10 is divided into an outer ring 19 and an inner ring 20, the outer ring 19 carrying detent springs 21 for retaining the inner ring 20.

[0064] What has been said about the first embodiment also applies to the second embodiment. However, the two embodiments differ with regard to the attachment of the connecting element 10 to the heat sink 12. How Fig. As shown in Figure 6, the detent spring 21 has an additional component in the form of a spring-return elastic locking pin 47, which is arranged on the detent spring 21 as an additional locking element. This serves – as will be described shortly – to fasten the outer ring 19 to the cooling sink 12, so that the screw bolts 22 known from the first embodiment can be dispensed with.

[0065] Fig. Figure 7 shows the second embodiment of the invention in composite form. Fig. 7 serves in particular to show the location of the section line BB, to which Fig. 8 is the corresponding section view.

[0066] Fig. Figure 8 initially shows the heat sink 12 with the cavity 18 known from the first embodiment, which extends as a through bore from the upper surface of the heat sink 12, which is provided with the connecting element 10, to its lower surface. The cavity 18 has a step 48 that narrows the cavity diameter and contributes to securing the outer ring 19 of the connecting element 10. The detent spring 21 is anchored in the outer ring 19. Due to the section view, the detent leg 34 of the detent spring 21 can be seen seated in the detent leg receptacle 42. It can be seen from the Fig.Figure 8 also shows how, in the second embodiment, the additional locking pin 47 arranged on the detent spring 21 engages the step 48 in the manner of a detent element and thus holds the detent spring 21 in the cavity 18. Through the connection between the detent spring 21 and the outer ring 19, the outer ring 19 is thus firmly anchored to the heat sink 12, and the outer ring 19 in turn holds the inner ring 20 (not visible here), so that the connecting element 10 is arranged on the heat sink 12 via the detent spring 21.

[0067] The main advantage of this invention is that additional screw bolts 22 for fixing the connecting element 10 on the heat sink 12 can be dispensed with.

[0068] The claims also mention, but do not show separately, that the dome 25 can be designed as a type of expansion dowel. The dome 25 can be expanded circumferentially via slots in the dome 25 oriented vertically to the mounting surface 16 and an expansion element that can be inserted into the dome 25, so that it fits frictionally or positively in the cavity 18 of the heat sink 12. The locking spring 21 can serve as the expansion element. Reference symbol list 10 Connection element 11 counter bearings 12 heat sinks 13 Circuit board 14 LED 15 Contact field 16 Arrangement area 17 threaded holes 18 Cavity 19 Outer ring 20 inner ring 21 Detent spring 22 screw bolts 23 mounting holes 24 recording frames 25 Cathedral 26 Recording room 27 Spring support leg 28 Light transmission opening 29 Rastnase 30 bar area 31 Spreading surface 32 Rastnasenscheitel 33 spring legs 34 Resting leg 35 Rast contour 36 Rast contour vertices 37 Support leg 38 Splay leg 39 Insertion opening 40 Cathedral interior 41 Spring support leg mount 42 Restraint mounting 43 Restraint seat 44 Spring leg shaft 45 Retaining wall 46 guide pin 47 Fixing pin 48th level V-axis L Light emission direction 100 assembly

Claims

[1] Connection element (10) for the electrical connection of an LED light source, - wherein the LED light source has a circuit board (13) which is provided with contact fields (15) for the electrical supply of an LED (14), - with a frame (24) which is designed to rest on a mounting surface (16) of a counter bearing (11) and to hold the circuit board (13) on this mounting surface (16), wherein the frame (24) is formed by an outer ring (19) and an inner ring (20), - with the inner ring (20), which is held inside the outer ring (19) and is designed to at least partially cover the circuit board (13) and to hold the circuit board (13) vertically to the mounting surface (16) on the counter bearing (11), - with the outer ring (19) which is designed to surround the circuit board (13) and to hold the circuit board (13) parallel to the mounting surface (16) on the counter support (11), - with locking lugs (29) formed by the inner ring (20), - with detent springs (21) arranged in the outer ring (19) that overlap the detent lugs (29) of the inner ring (20) and exert a tensile force on the inner ring (20) in the direction of the arrangement surface (16), characterized by , that - a spring receiving space for the detent spring (21) is provided, which extends in relation to the frame (24) resting on the mounting surface (16) into an area below the mounting surface (16), - the spring receiving space is formed by a dome (25) that originates from the underside of the outer ring (19). [2] Connecting element (10) according to claim 1, characterized by , that the spring receiving space is formed by a cavity (18) in the counter bearing (11) and that the dome (25) sits in the cavity (18). [3] Connecting element (10) according to claim 1, characterized by, that the inner ring (20) forms a spring support leg (27) which carries a detent projection. [4] Connecting element (10) according to claim 3, characterized by , that the spring support leg (27) projects into the spring receiving space and in particular rests against a wall bordering the spring receiving space. [5] Connecting element (10) according to claim 2, 3 and 4, characterized by , that the spring support leg (27) is supported against a wall section of the counter bearing (11) that limits the cavity (18). [6] Connecting element (10) according to claim 2, 3 and 4, characterized by , that the spring support leg (27) is supported on the dome (25) originating from the outer ring (19). [7] Connecting element (10) according to claim 1, characterized by , that the detent spring (21) is positively locked in the dome (25). [8] Connecting element (10) according to any one of the preceding claims, characterized by, that the detent spring (21) arranged in the outer ring (19) secures both the inner ring (20) to the outer ring (19) and the outer ring (19) to the counter bearing (11). [9] Connecting element (10) according to claim 2, characterized by , that the dome (25) is designed in the manner of an expansion dowel in order to hold the outer ring (19) against the counter bearing (11) by positive or frictional engagement.

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