Fastening sleeve arrangement with positive connection

Abstract

Fastening sleeve arrangement (10) with a fastening sleeve (14) and a support element (12), wherein the fastening sleeve (14) has a stop (18) with which the fastening sleeve (14) is supported on the support element (12) in the direction of the longitudinal axis (16) of the fastening sleeve (14), characterized in that a) the fastening sleeve (14) has a projection (20) which engages in a recess (26) of the carrier element; and / or b) the carrier element (12) has a projection which engages in a recess of the fastening sleeve (14) in order to secure the fastening sleeve (14) against twisting about its longitudinal axis (16), wherein the projection (20) and the recess (26) have a flank with a varying distance (Rf) from the longitudinal axis (16) of the fastening sleeve (14), and the fastening sleeve (14) is fixed to the carrier element (12) by welding, and the weld seam depth is a maximum of 70% of the material thickness (a) of the carrier element (12), and a projection height (t) in the direction of the longitudinal axis (16) of the fastening sleeve (14) is equal to the material thickness (a) of the carrier element (12).

Description

[0001] The invention relates to a fastening sleeve arrangement with a fastening sleeve and a carrier element, wherein the fastening sleeve has a stop with which the fastening sleeve is supported on the carrier element in the direction of the longitudinal axis of the fastening sleeve.

[0002] Such a fastening sleeve is known from WO 2011 / 141039 A1.

[0003] Fastening sleeves are an important component of connection technology and are used wherever a direct connection between the support element and the adjacent component is not possible or unsuitable.

[0004] A typical application for fastening sleeves is sheet metal constructions that are unsuitable for other fastening techniques due to their thin-walled support elements.

[0005] Conventional fastening sleeves are usually manufactured from sheet metal using cold forming. Tube drawing is a particularly common process for manufacturing fastening sleeves.

[0006] The prior art discloses fastening sleeve assemblies consisting of a fastening sleeve and a support element. The fastening sleeve assembly is created by attaching a fastening sleeve to a support element to create a connection option with an adjacent component.

[0007] The fastening sleeve therefore has a structurally designed possibility of fastening another component.

[0008] For this purpose, conventional fastening sleeves typically have a sleeve recess in the form of a hole through which, for example, a screw is threaded as a fastening element. The sleeve recess can be designed as a blind hole or a through-hole.

[0009] Fastening sleeves have a stop via which they are supported in a form-fitting manner on the support element in the longitudinal direction.

[0010] Typically, the stop consists of a stop surface in the longitudinal direction of the fastening sleeve. The stop surface is usually designed as a flange, with the surface dimension determined by the maximum permissible surface pressure.

[0011] For better positioning and centering of the fastening sleeve on the support element, the fastening sleeve is designed with a projection or a collar.

[0012] The projection usually protrudes perpendicularly from the stop surface, equal to the projection height / collar height. This creates a shoulder that can be inserted into a support recess on the support element. The prior art discloses rotationally symmetrical projections with flanks at a constant distance from the longitudinal axis of the fastening sleeve.

[0013] In typical mounting sleeve arrangements, the sleeve recess and the support recess are usually located one above the other. If both the sleeve recess and the support recess are designed as through-holes, the arrangement opens up the possibility of a push-through connection.

[0014] The fastening sleeve is typically attached to the support element by welding. The sleeve is pressed into the recess on the support element for positioning with the projection. The fastening sleeve is then welded to the support element along the connection point between the projection flank and the support element.

[0015] This creates a material-to-material connection between the fastening sleeve and the support element, which absorbs a torque around the longitudinal axis of the fastening sleeve.

[0016] The level of torque that can be absorbed and thus the strength of the connection between the fastening sleeve and the support element depends heavily on the quality of the weld seam.

[0017] Such a welding sleeve is known from DE 10 2015 009 604 A1.

[0018] The process of welding the fastening sleeve and the support element is therefore of great importance. To achieve the largest possible connection between the fastening sleeve and the support element, a "deep welding" technique is used, which connects the fastening sleeve and the support element over as much of the overlap area as possible. Laser welding is a common method for joining the fastening sleeve and the support element.

[0019] During the welding process itself, gases are generated – especially if the fastening sleeve or support element is galvanized – which, due to the process, cannot degas from the joint. These gases, trapped in the joint, lead to a weakening of the weld and thus to a reduced strength of the connection between the support element and the fastening sleeve.

[0020] In order to reduce the inclusion of gas in the joint, special fastening sleeves are used, which allow the welding gases to escape from the joint via degassing grooves provided by the design.

[0021] The introduction of degassing grooves requires greater manufacturing effort. Furthermore, complete escape of the welding gases and thus high weld quality cannot be guaranteed. To achieve the greatest possible reliability regarding weld quality, complex testing procedures are used for weld seam inspection.

[0022] DE 196 37 935 C1 describes a hollow welding stud with a sleeve-shaped body. The welding stud has a shoulder offset from a front surface area of the welding stud. The shoulder has a cylindrical outer surface perpendicular to the front surface area, which can be inserted into a workpiece bore. A weld can then be created between the front surface area of the welding stud and the surface of the workpiece, as well as between the outer surface of the shoulder of the welding stud and an inner surface of the workpiece bore.

[0023] DE 10 2012 220 033 A1 describes a functional part designed to be pressed into an opening in a sheet metal part. The functional part has a head portion with a contact surface for supporting the functional part on one side of the sheet metal part. A joining portion of the functional part protruding from the contact surface can be pressed into the opening in the sheet metal part. The joining portion and the opening in the sheet metal part can each have a polygonal outer contour to ensure that the functional part is secured against rotation relative to the sheet metal part. The functional part can be designed as a sleeve.

[0024] DE 10 2010 047 637 A1 describes a functional element with a flange forming a mounting surface and a cylindrical portion extending away from the flange, wherein an adhesive is arranged around the cylindrical portion and adjacent to the mounting surface. The functional element can be sleeve-shaped.

[0025] GB 690 248 A describes a weld nut having centering projections on one end face. Each centering projection has a flat outer surface perpendicular to the end face of the weld nut, with the outer surfaces of the centering projections being angled relative to one another. The centering projections can be inserted into an opening in a pre-drilled workpiece. In addition to the centering projections, the end face of the weld nut also has welding projections that are lower in height than the centering projections and that assist in creating a welded connection between the weld nut and the workpiece.

[0026] DE 195 19 761 A1 describes a stud weld nut with a circumferential, conically tapered collar. To connect the stud weld nut to a component, the outer surface of the collar of the stud weld nut is brought into contact with the edge of an opening in the component and then welded. Object of the invention

[0027] The invention is based on the object of proposing a fastening sleeve arrangement with a fastening sleeve and a carrier element, which enables both a low-cost and safe possibility of absorbing torque in the connection point between the fastening sleeve and the carrier element. Description of the invention

[0028] This object is achieved by an arrangement of the type mentioned at the outset, which is characterized in that the fastening sleeve has a projection which engages in a recess of the carrier element and / or the carrier element has a projection which engages in a recess of the fastening sleeve in order to secure the fastening sleeve against rotation about its longitudinal axis, wherein the projection and the recess have a flank with a varying distance from the longitudinal axis of the fastening sleeve and the fastening sleeve is fixed to the carrier element by welding and the weld seam depth is a maximum of 70% of the material thickness of the carrier element and that a projection height in the direction of the longitudinal axis of the fastening sleeve is equal to the material thickness of the carrier element.

[0029] Within the scope of the present invention, it is provided that a secure torque absorption in the connection point between the fastening sleeve and the carrier element is achieved by a positive toothing of the same.

[0030] This offers the advantage of a highly predictable joint quality. The previously mentioned negative influences due to the deep penetration welding process are avoided.

[0031] In particular, force transmission in the main load directions is achieved by positive locking between the fastening sleeve and the support element.

[0032] Typically, the support element and / or fastening sleeve are made of metal, in particular sheet metal is used as the support element.

[0033] The invention is particularly suitable for connecting a galvanized fastening sleeve with a galvanized support element.

[0034] As a rule, the fastening sleeve is manufactured using a cold forming process, less frequently by casting or 3D printing. Preferred embodiments of the invention

[0035] In a preferred embodiment of the fastening sleeve assembly according to the invention, the support element has a support recess for partially or completely receiving the fastening sleeve. This allows the fastening sleeve to be partially or completely recessed into the support element, as needed. This is particularly advantageous if a flat design of the support element is desired.

[0036] In a preferred development of this embodiment, the support recess is designed in the form of a through-hole. This simplifies the manufacture of the support element.

[0037] A particularly advantageous embodiment is one in which the fastening sleeve has a sleeve recess aligned with the support recess. With such an embodiment, a push-through or screw-through connection can be implemented, for example.

[0038] Another preferred embodiment is one in which the recess in the support element represents a part of the support recess. Likewise, the recess in the sleeve may represent a part of the sleeve recess.

[0039] In a preferred development of this embodiment, the sleeve recess is designed as a through-hole or as a blind hole.

[0040] A particularly advantageous embodiment is one in which the projection and the associated recess each have a flank that is at a varying distance from the longitudinal axis of the fastening sleeve. This creates a geometric arrangement between the fastening sleeve and the support element that absorbs torque and prevents rotational movements around the longitudinal axis of the sleeve. An additional material connection for the aforementioned purpose is not absolutely necessary.

[0041] In a preferred development of this embodiment, the projection of the fastening sleeve and the recess of the support element, which is in particular a component of the support recess, each have a flank in the shape of a polygon. The projection of the fastening sleeve can be designed in the shape of an external polygon. The recess of the support element can be designed in the shape of an internal polygon.

[0042] Advantageously, one embodiment provides that the projection is designed in the form of a collar with a uniform projection height.

[0043] A preferred embodiment is one in which the stop surface of the sleeve stop is designed as a flange without radial grooves. This embodiment allows the manufacturing effort for the fastening sleeve to be reduced while simultaneously increasing the maximum surface pressure.

[0044] Advantageously, one embodiment provides for the fastening sleeve to be fixed to the carrier element by pressing, gluing and / or wedging the fastening sleeve to the carrier element.

[0045] Furthermore, an embodiment is preferred in which the fastening sleeve has an outer radius that decreases in the longitudinal direction of the fastening sleeve.

[0046] A particularly advantageous embodiment is one in which the outer contour of the fastening sleeve is rotationally symmetrical to the longitudinal axis of the fastening sleeve.

[0047] In a preferred embodiment, the support element, particularly in the sheet metal design, has a defined chamfer between the support element and the fastening sleeve, which runs around the support recess and / or the recess on the support element. The chamfer is preferably designed with a maximum of 0.4 mm x 45°, preferably with a maximum of 0.35 mm x 45°, particularly preferably with a maximum of 0.3 mm x 45°. A defined chamfer on the support element improves the quality of the connection point between the support element and the fastening sleeve, as it prevents the projection of the fastening sleeve from accidentally coming into contact with the edge of the support recess and / or the recess on the support element. Furthermore, the chamfer can be used as an introduction bevel in the joining process, which improves both the positioning of the fastening sleeve on the support element and the joining process itself. Joining method according to the invention

[0048] The scope of the present invention also includes a method for producing a previously described fastening sleeve arrangement according to the invention by joining the fastening sleeve and the carrier element.

[0049] In a particularly preferred embodiment of the method, the fastening sleeve is joined to the support element by welding. The weld seam depth between the support element and the fastening sleeve is a maximum of 70% of the material thickness of the support element.

[0050] Further advantages of the invention will become apparent from the description and the drawings. Likewise, the above-mentioned and further-described features can be used individually or in combinations according to the invention. The embodiments shown and described are not intended to be exhaustive, but rather are exemplary in nature for describing the invention. Detailed description of the invention and drawing

[0051] The invention is illustrated in the drawing and explained in more detail using an exemplary embodiment. In the drawings: Fig. 1a: A first embodiment of a fastening sleeve arrangement, consisting of a carrier element and a fastening sleeve. Fig. 1b: A representation of a section through the center plane of the first embodiment of the fastening sleeve arrangement with the carrier element and the fastening sleeve. Fig. 1c: A longitudinal section through the support element of the first embodiment. Fig. 1d: A side view of the fastening sleeve of the first embodiment. Fig. 1e: A bottom view of the fastening sleeve of the first embodiment. Fig. 1f: A section AA, marked in Fig. 1d, through the fastening sleeve of the first embodiment. Fig. 1g: A bottom view of the support element of the first embodiment.

[0052] Fig. Figure 1a shows a first embodiment of a fastening sleeve assembly 10 comprising a support element 12 and a fastening sleeve 14. The fastening sleeve 14 is already depicted in its final assembled position on the support element 12. Fig. 1a discloses a longitudinal axis 16 of the fastening sleeve 14, which extends through the center of the fastening sleeve 14 in the longitudinal direction. In Fig. 1a, the longitudinal axis 16 is simultaneously an axially symmetrical central axis of the fastening sleeve 14.

[0053] Fig. 1b shows a section through the Fig. 1a and discloses a stop surface 18 between the support element 12 and the fastening sleeve 14, which prevents further insertion of the fastening sleeve 14 into the support element 12 and results in the fastening sleeve 14 being supported on the support element 12. Furthermore, Fig. 1b a projection 20, which extends to the stop surface 18 by the collar / projection height t (see Fig. 1d / 1f). Fig. Figure 1b also shows an arrangement in which the collar height t is equal to a material thickness a of the carrier element 12, thus creating a flat fastening surface 22 facing away from the fastening sleeve 14. The fastening sleeve 14 has a sleeve recess 24, which serves to receive a fastening element (not shown), in particular in the form of a screw. Furthermore, the projection 20 of the fastening sleeve 14 engages in a recess 26 (see Fig. 1c) of the support element 12.

[0054] Fig. 1c shows the Fig. 1g shows a section BB through the support element 12 of the previously described first embodiment of the fastening sleeve arrangement 10. The support element 12 has a support recess 28 and a recess 26 on the support element 12, which form a common recess in the form of a through-hole. In addition, Fig. 1c has a chamfer 30 which is formed circumferentially on the edge of the recess 26 of the carrier element 12.

[0055] Depending on the embodiment, the support recess 28 and the recess 26 on the support element 12 can be spatially separated.

[0056] Depending on the embodiment, the support recess 28 and / or the recess on the support element 12 can be designed as a blind hole recess.

[0057] Depending on the embodiment, the carrier recess 28 and the sleeve recess 24 can be arranged in alignment in the longitudinal direction and enable a push-through connection.

[0058] Fig. 1d shows a side view of the fastening sleeve 14 with the projection 20 on which a flank 32 is formed.

[0059] Fig. 1e discloses the projection 20 with the flank 32, which has a distance Rf from the longitudinal axis 16 of the fastening sleeve 14, which distance varies between a smallest distance Rfmin and a largest distance Rfmax. Such an embodiment of the flank 32, together with the recess 26 of the support element 12 encompassing the projection 20, establishes a positive connection between the fastening sleeve 14 and the support element 12, via which a torque about the longitudinal axis 16 can be absorbed.

[0060] The idea according to the invention suggests designing the projection 20 in such a way that a geometric pairing between the carrier element 12 and the fastening sleeve 14 results, which prevents rotation of the fastening sleeve 14 about the longitudinal axis 16 of the fastening sleeve 14.

[0061] Such a geometric pairing between the carrier element 12 and the fastening sleeve 14 is also conceivable in particular if a projection 20 of the carrier element 12 has a flank 32 which engages in a recess 30 of the fastening sleeve 14 at a varying distance Rf from the longitudinal axis 16 of the fastening sleeve 14 in such a way that a rotational movement about the longitudinal axis 16 of the fastening sleeve 14 is prevented.

[0062] The deburring of the projection 20 for production purposes is carried out via an undercut 34 running in the circumferential direction.

[0063] Fig. 1f shows the Fig. 1d shows the section AA through the longitudinal axis 16 of the fastening sleeve 14 and reveals a second flank 36 of the projection 20, which is arranged at a constant distance from the longitudinal axis 16 of the fastening sleeve 14.

[0064] For the implementation according to the invention, it is sufficient to arrange a single flank 32 of the projection 20 or a partial region of the flank 32 of the projection 20 with a varying distance Rf from the longitudinal axis 16 of the fastening sleeve 14 in order to create a torque-absorbing connection.

[0065] Fig. 1g shows a view from below of the support element 12 and reveals the chamfer 30 surrounding the recess 26.

[0066] Taking a summary of all the figures of the drawing, a fastening sleeve arrangement 10 is disclosed, which has a support element 12 and a fastening sleeve 14. The fastening sleeve 14 is supported on the support element 12 via a stop surface 18 in the longitudinal direction of the fastening sleeve 14. A projection 20 protrudes from the stop surface 18, preferably in the direction of the surface normal of the stop surface 18, with a projection height t. The projection 20 has a flank 32, which is preferably designed in the form of a polygon, in particular in the form of an external square, and engages in a recess 26, in particular in the form of a polygon, preferably in the form of an internal square, on the support element 12 in order to realize the rotation-proof fastening sleeve arrangement 10. A sleeve recess 24 of the fastening sleeve 14 offers the possibility of attaching a fastening element (not shown), in particular in the form of a screw. List of reference symbols 10 Mounting sleeve arrangement 12 support element 14 Mounting sleeve 16 Longitudinal axis of the fastening sleeve 14 18 Stop surface 20 lead 22 Mounting surface 24 sleeve recess 26 Recess on the support element 12 28 Carrier recess 30 Chamfer on the support element 12 32 flank 34 undercut 36 Second flank a Material thickness of the support element 12 t Collar height / height of the projection 20 Rf Distance of the flank 32 to the longitudinal axis 16 of the fastening sleeve 14 Rfmin Smallest distance of the flank 32 to the longitudinal axis 16 of the fastening sleeve 14 Rfmax Maximum distance of flank 32 to the longitudinal axis 16 of the fastening sleeve 14

Claims

[1] Fastening sleeve arrangement (10) with a fastening sleeve (14) and a support element (12), wherein the fastening sleeve (14) has a stop (18) with which the fastening sleeve (14) is supported on the support element (12) in the direction of the longitudinal axis (16) of the fastening sleeve (14), characterized by , that a) the fastening sleeve (14) has a projection (20) which engages in a recess (26) of the carrier element; and / or b) the carrier element (12) has a projection which engages in a recess of the fastening sleeve (14) in order to secure the fastening sleeve (14) against twisting about its longitudinal axis (16), wherein the projection (20) and the recess (26) have a flank with a varying distance (Rf) from the longitudinal axis (16) of the fastening sleeve (14), and the fastening sleeve (14) is fixed to the carrier element (12) by welding, and the weld seam depth is a maximum of 70% of the material thickness (a) of the carrier element (12), and a projection height (t) in the direction of the longitudinal axis (16) of the fastening sleeve (14) is equal to the material thickness (a) of the carrier element (12). [2] Fastening sleeve arrangement according to claim 1, characterized by that the carrier element (12) has a carrier recess (28) for partially or completely receiving the fastening sleeve (14). [3] Fastening sleeve arrangement according to claim 2, characterized bythat the carrier recess (28) is designed in the form of a through recess. [4] Fastening sleeve arrangement according to claim 2 or 3, characterized by that the fastening sleeve (14) has a sleeve recess (24) aligned with the carrier recess (28). [5] Fastening sleeve arrangement according to one of claims 2 to 4, characterized by that the recess (26) of the carrier element (12) forms part of the carrier recess (28). [6] Fastening sleeve arrangement according to claim 5, characterized by that the sleeve recess (24) is designed as a through recess or blind hole. [7] Fastening sleeve arrangement according to one of the preceding claims, characterized by that the projection (20) of the fastening sleeve (14) and the recess (26) of the carrier element (12) have a polygon. [8] Fastening sleeve arrangement according to one of the preceding claims, characterized bythat the projection (20) is in the form of a collar, in the direction of the longitudinal axis (16), with a uniform projection height (t). [9] Fastening sleeve arrangement according to one of the preceding claims, characterized by that the stop surface (18) is designed as a flange without radial grooves. [10] Fastening sleeve arrangement according to one of claims 2 to 9, characterized by that the carrier element (12) has a chamfer (30) with a maximum of 0.4 mm x 45° surrounding the carrier recess (28) and / or the recess (26) on the carrier element (12). [11] Fastening sleeve arrangement according to one of the preceding claims, characterized by that the fastening sleeve (14) is fixed to the carrier element (12) by means of pressing, gluing and / or wedging. [12] Method for producing a fastening sleeve arrangement (10) according to one of the preceding claims, in which the fastening sleeve (14) is fastened to the carrier element (12).

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