LED connection element

Abstract

Connection element for the electrical connection of an LED light source, - wherein the LED light source has a circuit board provided with contact pads for the electrical supply of the LED, - with a frame that is intended to rest on an arrangement surface of a counter-bearing and to hold the circuit board on this arrangement surface, wherein the frame is formed by an outer ring and an inner ring, - with the inner ring, which is held within the outer ring and is intended to overlap the circuit board at least in some areas and thus hold the circuit board vertically to the arrangement surface on the counter-bearing, - with the outer ring, which is intended to surround the circuit board and hold the circuit board parallel to the arrangement surface on the counter-bearing, - with locking lugs formed by the inner ring, - with locking springs arranged in the outer ring,overlap the locking lugs of the inner ring and exert a tensile force on the inner ring in the direction of the arrangement surface, wherein a spring receiving space for the locking spring is provided, which extends in relation to the frame resting on the arrangement surface into an area below the arrangement surface.

Description

[0001] The invention relates to a connection element for the electrical connection of an LED lamp, wherein the LED light source has a circuit board which is provided with contact fields for the electrical supply of the LED, with a frame which is intended to rest on an arrangement surface of a counter-bearing and to hold the circuit board on this arrangement surface, wherein the frame is formed by an outer ring and an inner ring, with the inner ring which is held within the outer ring and is intended to overlap the circuit board at least in regions and thus hold the circuit board vertically to the arrangement surface on the counter-bearing, with the outer ring which is intended to surround the circuit board and hold the circuit board parallel to the arrangement surface on the counter-bearing, with locking lugs which are formed by the inner ring, with locking springs which are arranged in the outer ring, engage over the locking lugs of the inner ring and exert a tensile force on the inner ring in the direction of the arrangement surface.

[0002] Connection elements for the electrical connection of an LED light source and for simultaneous mechanical fixation are known, for example, from the applicant's EP 2 083 489 A1. A broadly ring-shaped component has an integrated contact arrangement that enables the connection of external connecting conductors and transfers the electricity thus fed in to contact pads of a circuit board equipped with an LED.

[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 fastening devices such as screws, expansion dowels, etc., the ring-shaped component is fixed to a counter-bearing, usually a heat sink or a light-emitting plate, thus holding the circuit board between itself and the counter-bearing.

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

[0006] This type of connection element is widely used in the manufacture of modern luminaires using LED lamps and has been further developed compared to the embodiment shown in the aforementioned publication.

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

[0008] Furthermore, optics and reflectors mounted on the connector element can be moved closer to the light exit 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 generic term under the file number DE 20 2023 105 716 U1. In this document, the annular connection element is divided into an inner ring and an outer ring for reasons of improved logistics. The outer ring serves to secure the circuit board parallel to a mounting surface of the counter bearing. The inner ring is inserted into the outer ring and overlaps the circuit board, at least in part. In this way, the inner ring secures the circuit board vertically to the mounting surface on the counter bearing. In this embodiment, the connection element also carries a contact arrangement that enables the electrical connection of the circuit board to external connecting conductors.

[0010] A number of detailed requirements must be considered for the mechanical mounting, electrical supply, and safe operation of an LED light source. The thickness of the circuit boards—measured in the direction of light emission or vertically to the assembly surface—is subject to considerable variation.

[0011] The circuit boards must be pressed onto the counter bearing with a certain amount of force to ensure optimal heat dissipation. The longevity of the LED light source can only be ensured if the operating heat generated by the LED is adequately dissipated.

[0012] To optimize heat transfer from the circuit board to the counter-bearing, various types of thermal interfaces are applied between the circuit board and the counter-bearing. These range from thermal pastes to relatively strong / thick thermal pads. Typically, the luminaire manufacturer selects the thermal interface they consider appropriate. The connection element must also be able to compensate for the additional thermal interface layer.

[0013] Finally, it is important to ensure that the contact forces between the contact pads of the 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, which is the basis of the present invention, the contact arrangement comprises a connection contact located in the outer ring, to which the connecting conductors are connected. The inner ring carries a supply contact that rests on the contact pad of the circuit board.

[0014] The connection contact and the supply contact also have mutual contact surfaces to ultimately feed in electricity. With the two-part connection element according to the invention, it is therefore also important to ensure that the contact forces between the connection contact and the supply contact are also optimized for the lowest possible contact resistance.

[0015] The object of the invention is therefore to provide a suitable detent spring arrangement for a two-part connecting element, which ensures sufficient contact forces of the inner ring on the printed circuit board while taking into account the required tolerance compensation.

[0016] The object of the invention is achieved by a connecting element having 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 with respect to the frame resting on the arrangement surface into an area below the arrangement surface.

[0017] In order to compensate for high tolerances regarding the thickness of the circuit board and, if applicable, the thermal interface arranged between the circuit board and the counter bearing, the inner ring must be able to perform a comparatively large movement stroke vertically relative to the mounting surface of the counter bearing or in the direction of the LED's light emission. At the same time, the detent spring must be able to exert sufficient contact pressure in the direction of the mounting surface in every position of the inner ring caused by the tolerances.

[0018] This requires a detent spring that can cover a comparatively large spring travel and exert sufficient contact force. Space must be created in the connecting element to accommodate a large spring travel. High spring forces require specific dimensions of the detent spring element. These requirements for a detent spring contradict the technical need to create connecting elements that are as flat as possible to avoid shadowing of the emerging light by the connecting element.

[0019] The invention provides for the required installation space for the detent spring to be used to a region below the arrangement plane of the counter bearing, or at least to be drawn into this area. In this way, the thickness of the connecting element, measured in the light exit direction or vertically to the arrangement plane of the counter bearing, can be reduced to the absolute minimum. Shading of the emerging light by the connecting element is reliably avoided or greatly reduced. Nevertheless, sufficient installation space is provided for a detent spring element, which requires a sufficiently large spring accommodation space due to the spring forces to be applied and, in particular, the required spring travel.

[0020] In a specific embodiment, the invention proposes that the spring receiving space be formed by a dome that originates from the underside of the outer ring and is directed, in particular, opposite the light exit direction. The spring element can be arranged in this dome and thus receives sufficient movement space for the required spring travel, particularly in the case of a spring element shown in the exemplary embodiment with a pivot axis aligned parallel to the mounting surface.

[0021] In another alternative embodiment, the spring receiving space is formed by a cavity in the counter bearing. For example, a corresponding cavity or recess—whether designed as a blind hole or through-bore—can be incorporated into a heat sink. A detent spring located there thus has sufficient installation space and room to generate large spring travel.

[0022] In a particularly preferred embodiment, the dome of the outer ring forming the spring receiving space is seated in the cavity of the counterbearing. In this way, the dome formed by the outer ring is well protected against mechanical damage by the surrounding material of the counterbearing, in particular the heat sink.

[0023] To absorb high spring forces, a sufficient material thickness is required in the area where the inner ring interacts with the detent spring, especially for a plastic inner ring. Specifically, the detent projection must be sufficiently thick to prevent plastic deformation under the influence of the detent spring's spring forces.

[0024] However, this means that space must be created for a correspondingly thick material support, which - as already discussed above - runs counter to the requirements for flat connection elements in particular.

[0025] The invention therefore additionally proposes that the inner ring form a spring support leg that supports the locking projection. In particular, it is provided that the spring support leg protrudes into the spring receiving space and rests against a wall delimiting the spring receiving space.

[0026] The invention has recognized that the spring receiving space creates space to provide a locking projection sufficiently dimensioned to absorb the spring forces, without this having a disadvantageous effect on the dimensioning of the part of the connecting element located above the arrangement surface.

[0027] Furthermore, the invention recognizes that the locking projection can be kept comparatively small if it rests against a wall defining the spring chamber and is supported there. Thus, the wall defining the dome or the cavity is used to absorb the forces acting on the locking projection. This allows the spring support leg forming the locking projection to be smaller, since the spring forces are also absorbed by the respective wall.

[0028] In a particularly preferred embodiment, the spring support leg rests against the wall forming the dome, which in turn rests against the wall defining the cavity. Since the counterbearing is typically made of a metal, particularly aluminum, the dome and spring support leg components, made of the plastic material of the inner and outer rings, are supported very effectively against a more stable material, dissipating the load.

[0029] The invention further recognizes that the locking spring for holding the inner ring is also suitable for securing the outer ring to the counterbearing. This gives the locking spring of the outer ring a dual purpose.

[0030] Particularly when the counter bearing is a heat sink, undercuts often occur when drilling the holes for the cavity in the area of the cooling fins, into which the detent spring for fastening the outer ring to the counter bearing can engage.

[0031] Alternatively, it is conceivable for the outer ring dome to be designed like an expansion dowel. For this purpose, the dome can be slotted vertically to the mounting surface, for example. The dome walls are deflected via an expansion element and can engage the counterbearing with frictional and / or positive engagement. Undercuts created by drilling holes in a heat sink in the area of the cooling fins are also suitable here.

[0032] The invention will now be explained in more detail using two exemplary embodiments, which reveal further advantages and features. They show: Figure 1 an inventive connecting element supplemented by LED lamps and a counter bearing in exploded view, Figure 2 the assembly according to Figure 1 in compound form, Figure 3 the assembly according to Figure 2 in view from above, Figure 4 a sectional view of the assembly according to section line AA in Figure 3 , Figure 5 a sectional view of the assembled assembly in Figure 3 according to section line AA, Figure 6 an exploded view of an alternative embodiment of the invention, Figure 7 a top view of the embodiment according to Figure 6 , Figure 8 a sectional view according to section line BB as in Figure 6 .

[0033] In the figures, an assembly using the connection element 10 according to the invention is provided with the reference number 100.

[0034] In addition to the counter bearing 11 in the form of a heat sink 12, the assembly 100 also initially comprises a printed circuit board 13. The printed circuit board 13 is provided with an LED 14 and also carries contact fields 15.

[0035] The counter bearing 11 has an arrangement surface 16 aligned with the circuit board 13, which is pierced by threaded holes 17 and cavities 18.

[0036] The connection element 10 comprises an outer ring 19 and an inner ring 20 and also has locking springs 21. The contact arrangement provided for the electricity supply to the circuit board 13 is not shown in the exemplary embodiments, since it plays only a subordinate role for the core of the invention.

[0037] Screw bolts 22 pass through fastening holes 23 of the outer ring 19 and are inserted into the threaded holes 17 of the heat sink 12 to fix the outer ring 19 to the heat sink.

[0038] The outer ring 19 forms a receiving frame 24 into which the printed circuit board 13 is to be inserted.

[0039] Domes 25 emerge from the underside of the outer ring 19 facing the arrangement 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 directed parallel to the light exit direction or vertical to the arrangement plane, forms the central axis of the connecting element 10.

[0040] Spring support legs 27 emerge from the inner ring 20 on its underside facing the arrangement surface 16. In addition, the inner ring 20 forms a central light passage opening 28 which surrounds the LED 14.

[0041] Figure 2 shows the assembly 100 according to Figure 1in compound form. Here the interaction of the Figure 1 The components shown are already partially visible. 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 seated in the fastening holes 23 and engage with their threaded shafts in the threaded holes 17 of the heat sink 12, which are not visible here because they are concealed by the outer ring 19. In this way, the outer ring 19 is firmly arranged on the heat sink 12 or the counter bearing 11.

[0042] As one can imagine, the domes 25 emerging from the underside of the outer ring 19 are seated in the cavities 18 of the heat sink 12 so that the outer ring 19 can lie flat on the arrangement surface 16.

[0043] The detent springs 21 are seated in their respective associated domes 25, with the spring support legs 27 also extending into the respective associated domes 25. In this way, the inner ring 20 can be seated in the receiving space 26 (not shown here) of the outer ring 19 and surround the LED 14 with its light passage opening 28 (not shown here).

[0044] Figure 3 shows a top view of the assembly 100 according to Figure 2 and serves in particular to determine the position of the section according to section line AA for the following Figure 4 and 5 to represent.

[0045] The Figure 4 and 5 show a sectional view through the assembly 100, where Figure 4 an exploded view of the cut and Figure 5 is a sectional view of the assembly 100 in the assembled state.

[0046] The sectional view according to Figure 4first shows the inner ring 20. Each spring support leg 27 forms a locking lug 29 which points radially outwards with regard to the light exit direction L or vertical axis V. Each locking lug 29 has a locking surface 30 pointing towards the upper side remote from the counter bearing 11 and a spreading surface 31 pointing in the direction of the counter bearing 11. Starting from a locking lug apex 32, which at the same time 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 designed as an inclined surface on the spring support leg 27 which falls in the direction of the vertical axis V.

[0047] Figure 4also shows the detent springs 21. These initially comprise a spring leg 33, which is anchored by a detent leg 34 in the outer ring 19, particularly within its dome 25. In the specific embodiment, the detent leg 34 is directed radially outward and toward the upper side of the connecting element 10, facing away from the counter bearing 11. However, this is not absolutely necessary for the function of the detent leg 34. In the exemplary embodiment, the detent leg 34 also originates from the lower end of the spring leg 33 facing the heat sink 12.

[0048] At its end facing the top of the connecting element 10, the spring leg 33 bears a locking contour, designated overall by the reference number 35, which is directed radially inward toward the inner ring 20. Starting from a locking contour apex 36, which also defines the maximum radial inner position of the locking contour 35, a retaining leg 37 slopes downwards toward the heat sink 12 and terminates in the spring leg 33. Toward the top of the connecting element 10, starting from the locking contour apex 36, a spreading leg 38 extends radially outward and, as it were, forms the free, upper end of the locking spring 21.

[0049] Figure 4 also allows a detailed insight into the dome 25 of the outer ring 19.

[0050] First, the dome 25 has an insertion opening 39 toward the top of the connecting element 10, which allows access to the dome interior 40. The dome interior 40 can be divided into various functional areas, as described below.

[0051] First, the dome interior 40 provides a spring support leg receptacle 41, in which the spring support leg 27 is inserted when the connecting element 10 is assembled (see Figure 5 ). The spring support leg holder 41 is arranged radially inward in the dome interior 40.

[0052] A locking leg receptacle 42 is provided radially outwardly in the dome interior 40. This also forms a locking leg seat 43. The free end of the locking leg 34 is supported on this locking leg seat 43 for anchoring 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 Figure 5 visible.

[0053] A spring leg shaft 44 is formed in the dome 25 between the spring support leg receptacle 41 and the locking leg receptacle 42. The spring leg shaft 44 is delimited by a support wall 45 relative to the spring support leg receptacle 41, which prevents excessive radial inward displacement of the spring leg 33 toward the spring support leg. In the direction of the locking leg receptacle 42, the spring leg shaft 44 is delimited by a guide pin 46, which holds the lower end of the spring leg 33 in a stable position in the spring leg shaft 44 and prevents the spring leg 33 from jumping into the locking leg receptacle 42.

[0054] 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 one another and accessible via the insertion opening 39 of the dome 25.

[0055] From the overview of the Figure 4 and 5 it is clear how the assembly 100, in particular the connecting element 10, is assembled.

[0056] First, the detent springs 21 are inserted into the respective associated dome 25 opposite to the light exit direction L, i.e., from the top side of the connecting element 10. In doing so, the spring legs 33 enter the spring leg shaft 44. At the same time, the detent leg 34 finds its hold 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 inward in the direction of the vertical axis V into the spring support leg receptacle 41.

[0057] The outer ring 19 is now placed on 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 rests on the mounting surface 16 of the heat sink 12.

[0058] To assemble the assembly 100, the printed circuit board 13, i.e., the LED light source, is now inserted into the receiving frame 24 formed by the outer ring 19, so that the underside of the printed circuit board 13 also rests on the mounting surface 16 of the heat sink 12. If necessary, thermal conductivity means—not shown in the drawings—are arranged between the printed circuit board 13 and the heat sink 12.

[0059] Within the outer ring 19, the circuit board 13 is now securely held against horizontal displacement or displacement parallel to the arrangement surface.

[0060] The inner ring 20 is now placed onto the outer ring 19 opposite to the light exit direction L. The spring support legs 27 are inserted into the respective associated dome 25 and then into the corresponding spring support leg receptacle 41. The spreading surfaces 31 of the respective locking lug 29 come into contact with the respective spreading leg 38 of the locking spring 21, whereby the resulting inclined surface pairing 31 / 38 leads to a radially outward displacement of the locking contour 35. This movement reaches its maximum when the locking contour vertex 36 is positioned on the locking lug vertex 32. Subsequently, with continued insertion movement opposite to the light exit direction L, the retaining legs 37 engage with the respective locking surface 30 of the locking lug 29.In this case, the locking contour 35 is displaced radially inward with a spring-return elastic action, whereby the inclined surface pairing 31 / 38 between the retaining leg 37 and the locking surface 30 applies a force component directed toward the arrangement surface 16 to the inner ring 20. This clamps the inner ring 20 against the inserted printed circuit board 13 and ensures sufficient contact pressure of the printed circuit board 13 against the heat sink 12 to promote optimal heat dissipation. In the same way—not further illustrated here—the aforementioned force component, which clamps the inner ring 20 toward the arrangement surface 16, also promotes correct contact of the contact arrangement with the contact fields 15 of the printed circuit board 13 to achieve correct electrical transition values.

[0061] Due to the locking domes 25 extending into an area below the arrangement surface 16, a sufficiently large space is created to create a spring element in the form of the locking spring 21 which is elongated in the light exit direction L or parallel to the vertical axis V and which, over its longitudinal extension of the spring leg 33 within the spring leg shaft 44, offers sufficiently large spring travel for holding the inner ring 20 in the outer ring 19.

[0062] Figure 6 shows an exploded view of an alternative embodiment of the invention. Figure 1The above also applies to the present illustration. This also involves an assembly 100 with a connection element 10, which holds an LED light source—consisting of a circuit board 13 with contact pads 15 and an LED 14—on a counter-bearing 11 in the form of a heat sink 12. The connection element 10 is divided into an outer ring 19 and an inner ring 20, with the outer ring 19 carrying detent springs 21 for holding the inner ring 20.

[0063] What has been said about the first embodiment also applies to the second embodiment. However, both embodiments differ with regard to the fastening of the connection element 10 to the heat sink 12. Figure 6As shown, the detent spring 21 has an additional component in the form of a spring-return elastic fixing pin 47, which is arranged as an additional locking means on the detent spring 21. This serves - as will be described shortly - to fasten the outer ring 19 to the heat sink 12, so that the screw bolts 22 known from the first embodiment can be dispensed with.

[0064] Figure 7 shows the second embodiment of the invention in assembled form. Figure 7 serves in particular to show the position of the section line BB, to which Figure 8 the corresponding section view.

[0065] Figure 8shows first the heat sink 12 with the cavity 18 known from the first embodiment, which extends from the top of the heat sink 12 provided with the connection element 10 to its underside as a through hole. The cavity 18 has a step 48, which narrows the cavity diameter and contributes to the fixing of the outer ring 19 of the connection element 10. The detent spring 21 is anchored in the outer ring 19. Due to the sectional position, the detent leg 34 of the detent spring 21 can be seen seated in the detent leg receptacle 42. Figure 8also how the fixing pin 47, which in the second embodiment is additionally arranged on the detent spring 21, engages behind the step 48 in the manner of a detent element and thus holds the detent spring 21 in the cavity 18. Due to the connection between the detent spring 21 and the outer ring 19, the outer ring 19 is firmly anchored on 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.

[0066] The essential advantage of this invention is that additional screw bolts 22 for fixing the connection element 10 to the heat sink 12 can be dispensed with.

[0067] Also mentioned in the claims, but not separately illustrated, is that the dome 25 can be designed as a type of expansion dowel. Slots in the locking dome 25 aligned vertically with the mounting surface 16 and an expansion element insertable into the locking dome 25 allow the locking dome 25 to be expanded in circumference, so that it rests frictionally or positively in the cavity 18 of the heat sink 12. The locking spring 21 can serve as an expansion element. List of reference symbols

[0068] 10Connection element 11Counter bearing 12Heat sink 13Printed circuit board 14LED 15Contact field 16Arrangement surface 17Threaded hole 18Cavity 19Outer ring 20Inner ring 21Locking spring 22Screw bolt 23Mounting holes 24Receiving frame 25Dom 26Receiving space 27Spring support leg 28Light passage opening 29Locking lug 30Latch surface 31Spreading surface 32Locking lug apex 33Spring leg 34Locking leg 35Locking contour 36Locking contour apex 37Retaining leg 38Spreading leg 39Insertion opening 40Dom inner space 41Spring support leg receptacle 42Locking leg receptacle 43Locking leg seat 44Spring leg shaft 45Support wall 46Guide pin 47Fixing pin 48Step VAxis LLight exit direction 100Assembly

Claims

1. A connection element (10) for the electrical connection of an LED lamp, - wherein the LED lamp has a circuit board (13) provided with contact pads (15) for the electrical supply of the LED (14), - with a frame (24) which is intended to rest on an arrangement surface (16) of a counter-bearing (11) and to hold the circuit board (13) on this arrangement surface (16), wherein the frame is formed by an outer ring (19) and an inner ring (20), - with the inner ring (20) which is held within the outer ring (19) and is intended to overlap the circuit board (13) at least in some areas and thus to hold the circuit board (13) vertically to the arrangement surface (16) on the counter-bearing (11), - with the outer ring (19) which is intended to surround the circuit board (13) and to hold the circuit board (13) parallel to the arrangement surface (16) on the counter-bearing (11), - with locking lugs (29) formed by the inner ring (20),- with locking springs (21) arranged in the outer ring (19), which engage over the locking 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 with respect to the frame (24) resting on the arrangement surface (16) into an area below the arrangement surface (16).

2. Connection element (10) according to claim 1, characterized in that the spring receiving space is formed by a dome (25) which originates from the underside of the outer ring (19).

3. Connection element (10) according to claim 1, characterized in that the spring receiving space is formed by a cavity (18) in the counter bearing (11).

4. Connection element (10) according to claim 2 and 3, characterized in that the dome (25) sits in the cavity (18).

5. Connection element (10) according to claim 1, characterized in thatthe inner ring (20) forms a spring support leg (27) which carries the locking projection.

6. Connection element (10) according to claim 5, characterized in that the spring support leg (27) projects into the spring receiving space and in particular rests against a wall delimiting the spring receiving space.

7. Connection element (10) according to claim 3, 5 and 6, characterized in that the spring support leg (27) is supported on a wall section of the counter bearing (11) delimiting the cavity (18).

8. Connection element (10) according to claim 4, 5 and 6, characterized in that the spring support leg (27) is supported on the dome (25) emerging from the outer ring (19).

9. Connection element (10) according to claim 2, characterized in that the detent spring (21) is held positively in the dome (25).

10. Connection element (10) according to one of the preceding claims, characterized in thatthe detent spring (21) arranged in the outer ring (19) fixes both the inner ring (20) to the outer ring (19) and the outer ring (19) to the counter bearing (11).

11. Connection element (10) according to claim 4, characterized in that the dome (25) is designed in the manner of an expansion dowel in order to hold the outer ring (19) positively or frictionally on the counter bearing (11).

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