Stabilizer for a chassis of a motor vehicle and method for producing a stabilizer

Abstract

The invention relates to a stabilizer for a chassis of a motor vehicle, with a stabilizer tube (2), a coupling element (5) arranged at a first end section (3) with an insertion section (19), a joining section (6) and a connecting means (7) for detachably connecting a connection element (8), wherein a radial gap (21) is formed between the insertion section (19) and the stabilizer tube (2), and wherein the coupling element (5) is connected to the stabilizer tube (2) via a welded connection (30) produced by means of capacitor discharge welding or laser welding between the joining section (6) and the stabilizer tube (2).

Description

[0001] The invention relates to a stabilizer for a chassis of a motor vehicle and a method for producing a stabilizer.

[0002] Stabilizers are used, for example, to reduce the roll angle of a motor vehicle or to influence the driving behavior of a motor vehicle, in particular the self-steering behavior.

[0003] Such a stabilizer is known, for example, from EP 3 508 361 A1. There, the stabilizer comprises a stabilizer rod and a stabilizer connection that couples the stabilizer rod to a suspension device. For this purpose, the stabilizer connection has a ball stud with a shaft portion and a ball portion. The shaft portion is inserted into an open end of the stabilizer rod and secured therein. In one embodiment, a connecting end of the shaft portion is provided with a conical surface that is pressed onto the opening end of the stabilizer rod and welded to the stabilizer rod. According to another embodiment, a sleeve is press-fitted into the opening end of the stabilizer rod and fitted onto the shaft portion.

[0004] US Pat. No. 6,533,301 B1 discloses a stabilizer bar in which an end adapter is welded to one end of the stabilizer tube. The end adapter includes a hole with an internal thread into which a ball head is screwed.

[0005] A similar stabilizer with a cylindrical insert with an internal thread inserted at the end is known from FR 2 761 009 A1.

[0006] The invention is based on the object of providing a dense and robust stabilizer for a chassis of a motor vehicle, which can be used flexibly and is easy to manufacture.

[0007] According to a first solution, a stabilizer for a chassis of a motor vehicle is proposed, comprising: a stabilizer tube with an end section and a tube axis, and a coupling element with an insertion section, a conical joining section and a connecting means for detachably connecting a connection element, wherein the coupling element is arranged with its insertion section in the end section of the stabilizer tube, wherein a radial gap is formed between the insertion section and an inner wall of the stabilizer tube, and wherein the coupling element is joined to the stabilizer tube via a welded connection produced by means of capacitor discharge welding between the conical joining section and the stabilizer tube.

[0008] According to an alternative second solution, a stabilizer for a chassis of a motor vehicle is proposed, comprising: a stabilizer tube with an end section and a tube axis, a coupling element with an insertion section, a flange-shaped joining section and a connecting means for detachably connecting a connection element, wherein the coupling element is arranged with its insertion section in the end section of the stabilizer tube, wherein a radial gap is formed between the insertion section and an inner wall of the stabilizer tube, and the flange-shaped joining section has a larger outer diameter than the end section of the stabilizer tube, wherein the coupling element is joined to the stabilizer tube via an axial welded connection produced by means of laser welding between the flange-shaped joining section and an end face of the stabilizer tube.

[0009] In both solutions, the joining section of the coupling element allows the coupling element to be connected to stabilizer tubes of different diameters. This allows the stabilizer to be flexibly adapted to the requirements of different motor vehicles. By connecting the coupling element to the stabilizer tube using capacitor discharge welding or laser welding, the heat-stressed joining zone in the area of ​​the weld seam is reduced, thereby reducing material-weakening structural changes in the stabilizer tube. Furthermore, the welded connection between the conical or flange-shaped joining section of the coupling element and the stabilizer tube ensures that the end section of the stabilizer tube is sealed liquid-tight or gas-tight. Capacitor discharge welding enables a very stable welding process because the capacitor decouples the welding process from the power grid.Laser welding can produce a precise and fast weld.

[0010] The coupling element is arranged on an end face of the stabilizer tube, wherein according to the first solution, the conical joining section of the coupling element is connected in particular to an inner edge of the stabilizer tube, and according to the second solution, the flange-shaped joining section of the coupling element is connected in particular to an end face of the stabilizer tube. In the second solution, the welded connection is preferably formed by a weld seam running annularly around the longitudinal axis of the coupling element. Laser welding takes place in the axial direction, i.e., the laser beam radiates axially through the flange section into the end face of the tube, so that the end face of the tube fuses with the underside of the flange section and is joined in a materially bonded manner. The laser beam is guided annularly in overlap with the end face, creating a circumferentially tight welded connection.Preferably, the weld seam is arranged radially outside a central annular line of the pipe or its end section, viewed axially toward the pipe end or in cross-section through the end section. The weld seam can have a diameter of less than 0.75 mm when laser welding.

[0011] The joining section has a radial height or extension in the radial direction to the longitudinal axis of the coupling element that can be greater than twice and / or less than five times the wall thickness of the stabilizer tube. In the first solution, the radial height can be understood as the distance between the smallest radius and the largest radius of the conical connecting section, and in the second solution, the distance between the outer surface of the insertion section and the outer surface of the flange section. The radial height can be designed depending on the required thread size of the internal thread. For example, with an internal thread with a size of M8, the joining section can have a radial height of at least 3 and / or up to 6 mm, in particular between 4 and 5 mm. With an internal thread with a size of M13, the joining section can, for example, have a radial height of at least 7 and / or up to 10 mm, in particular between 8 and 9 mm.The wall thickness of the stabilizer tube describes the distance between an inner surface of the inner wall and an outer surface of an outer wall of the stabilizer tube. It can be, for example, a minimum of 2 mm and / or a maximum of 7 mm, but is not limited to this.

[0012] The stabilizer tube is a cylindrical component with a cross-section extending in the longitudinal direction of the stabilizer tube between a first end section and a second end section, for example, an elliptical or circular cross-section. The stabilizer tube is preferably bent at one or more bending points. For example, the stabilizer tube has two bending points.

[0013] The coupling element is designed for the detachable connection of the stabilizer tube to the connecting element and can also be referred to as a connecting or adapter element. The connecting element can, for example, be a ball stud of a coupling rod. Preferably, the coupling element is arranged at least partially on or in the first end section of the stabilizer tube.

[0014] The connecting means is formed on or preferably in the coupling element. The connecting means is preferably designed such that the connecting element can be detachably connected to the coupling element. The connecting element and the coupling element can preferably be connected to one another via force-fitting and / or form-fitting connecting means.

[0015] The coupling element is connected to the stabilizer tube via the welded joint, which is visible as a weld seam. The welded joint between the conical or flange-shaped joining section of the coupling element and the stabilizer tube is located in the area of ​​the first end section of the stabilizer tube.

[0016] The welded connection between the stabilizer tube and the coupling element preferably ensures a tightness that reaches 2 bar internal pressure and is still at least 0.75 times the maximum applied pressure after 5 minutes.

[0017] The stabilizer tube extends from a first end face arranged on the first end section to a second end face arranged on the second end section. The end face of the stabilizer tube describes a final cross-section of the stabilizer tube. An end section of the stabilizer tube is understood in particular to be a straight section extending from an end face in the longitudinal direction of the stabilizer tube. For example, the end section can extend from the first end face over a length of at least 20 mm, 40 mm, 50 mm or more. The inner edge of the stabilizer tube can be an edge of the first end face adjacent to an interior of the stabilizer tube. The end face-side arrangement of the coupling element on the stabilizer tube makes it possible to dispense with machining of the end section of the stabilizer tube, for example, pressing the end section.This makes the stabilizer particularly easy to manufacture.

[0018] According to one possible embodiment, the coupling element can have a connecting surface that protrudes beyond the end face of the stabilizer tube in the axial direction of the stabilizer tube in order to axially support the connecting element. The connecting surface of the coupling element is arranged at a distance from the first end face of the stabilizer tube. Preferably, the connecting surface of the coupling element is arranged parallel to the first end face of the stabilizer tube or the welded joint. The axial direction of the stabilizer tube is understood to mean, in particular, the longitudinal direction of the stabilizer tube, which follows the bending direction of the cross section of the stabilizer tube at possible bending points.

[0019] The connection surface of the coupling element can be larger than the cross-sectional area of ​​the stabilizer tube, i.e., the area of ​​the cross section of the stabilizer tube, and / or the end face of the stabilizer tube. For example, the connection surface of the coupling element can be larger than 1.5 times, in particular larger than 2 times, the cross-sectional area of ​​the stabilizer tube. The stabilizer tube can have a constant cross-sectional area over its length, although designs with variable wall thickness over the length are also possible.

[0020] The diameter and wall thickness of the stabilizer tube can be selected according to the forces to be transmitted. For example, a stabilizer tube can have an inner diameter of at least 14 mm and / or up to 40 mm. The wall thickness of the stabilizer tube can be between 2 mm and 7 mm, for example. The cross-sectional area of ​​the stabilizer tube is formed, in particular, as an annular surface between an outer contour and an inner contour.

[0021] Because the coupling element has a connecting surface for the connecting element arranged at a distance from the end face, and the connecting surface is preferably larger than the cross-sectional area and / or the end face of the stabilizer tube, high tension forces in the contact between the connecting element and the coupling element can be supported. This achieves a particularly high strength and robust connection between the stabilizer and the connecting element.

[0022] The geometry of the coupling element also depends in particular on the forces to be transmitted. The connection surface of the adapter is, in particular, circular in shape and is preferably dimensioned such that the clamping forces acting on the connection element are securely supported. For example, the connection surface for a coupling element dimensioned for lower forces to be transmitted can have an inner diameter of at least 8 mm and / or an outer diameter of at least 20 mm. An adapter element designed for greater forces can have a connection surface with an inner diameter of, for example, at least 14 mm and / or an outer diameter of at least 60 mm.

[0023] According to a possible further development, the connecting means of the coupling element can be formed as an internal thread, in particular with a thread size of M8 to M14, and can be engaged with an external thread of the connecting element. The external thread of the connecting element is formed, for example, on a pin portion of the connecting element. The connecting element can be designed as a ball stud. The external thread has a thread size corresponding to the size of the internal thread.

[0024] The shape of the coupling element, i.e., length and diameter of the coupling element can be designed depending on the thread size.

[0025] According to one embodiment, the length of the coupling element can be greater than the diameter of the stabilizer tube, in particular the outer diameter. The length of the coupling element is understood to be an axial distance between the connection surface and a bottom surface of the coupling element. The connection surface and the bottom surface of the coupling element are formed, for example, as end faces. The thread size of the internal thread and the external thread is preferably designed depending on the respective load case. Different load cases differ, for example, due to different forces transmitted from the connection element via the coupling element to the stabilizer tube.

[0026] For a thread with a thread size of M8, the coupling element can, for example, have a length of at least 20 mm, in particular a length between 21 and 25 mm. Furthermore, a coupling element with a thread size of M14 can, for example, have a length of at least 35 mm, in particular a length between 36 and 40 mm. By providing an internal thread as the connecting means, a simple and secure connection of the connecting element to the coupling element can be enabled. Because the detachable threaded connection and the coupling element are designed depending on the load case, the stabilizer can be used even more flexibly.With a coupling element whose length is greater than the diameter of the stabilizer tube, in particular the outer diameter of the cross-sectional area of ​​the stabilizer tube, a threaded connection between the coupling element and the connecting element can be made possible with high safety and strength.

[0027] The coupling element has an insertion section extending longitudinally from the conical or flange-shaped joining section and arranged in the end section of the stabilizer tube. The insertion section can have at least a partially cylindrical shape and can therefore also be referred to as a cylinder section. At an end facing away from the joining section, the insertion section is preferably designed to be closed, i.e., the coupling element has a bottom surface without openings at the end of the insertion section. The closed structure of the insertion section seals the interior of the stabilizer tube from the outside. The insertion section is preferably arranged coaxially to the tube axis in the stabilizer tube.

[0028] A radial gap is preferably formed between the insertion section of the coupling element and the inner wall of the stabilizer tube. Pressing the two components together is not provided. The insertion section preferably has a circumferential surface arranged between the base surface and the joining section. The radial gap is preferably formed such that the circumferential surface of the insertion section does not touch the inner wall of the stabilizer tube. The radial gap can have a substantially constant distance from the inner wall of the stabilizer tube in the circumferential direction relative to the longitudinal axis of the coupling element. For example, the radial gap can have a length of 0.1 to 0.5 mm. The insertion section enables a simple and reliable design of the coupling element depending on the thread size and also ensures that large forces can be supported by the solid coupling element.The radial gap between the insertion section of the coupling element and the inner wall of the stabilizer tube ensures a flow of force via the welded connection between the inner edge or end face of the stabilizer tube on the one hand and the conical or flange-shaped joining section on the other hand.

[0029] The stability and strength of the stabilizer is made possible by the solid coupling element. This allows for a reduction in the wall thickness of the stabilizer tube, thus lowering the manufacturing costs. Furthermore, the advantageous ratio between the wall thickness of the stabilizer tube and the radial height of the conical or flange-shaped joining section ensures that the coupling element can be used even more flexibly for a wide variety of stabilizer tubes with different diameters.

[0030] According to one embodiment, the stabilizer tube and the coupling element can be made of different materials, which can reduce the manufacturing costs of the stabilizer and allow the stabilizer to be adapted even more flexibly to the respective load case. The different materials are selected so that they can be easily welded together. The stabilizer tube, for example, is made of a low-alloy case-hardening steel, such as 26MnB5 or 34MnB5. The coupling element is made of a structural steel, for example.

[0031] A further coupling element with a conical joining section can be arranged on or in the second end section of the stabilizer tube and connected to the stabilizer tube via a welded joint created by capacitor discharge welding between the conical joining section and the stabilizer tube. Alternatively, a further coupling element with a flange-shaped joining section can also be arranged on the second end section and connected to the stabilizer tube via a welded joint created by laser welding between the flange-shaped joining section and the stabilizer tube. The coupling elements of a stabilizer are preferably formed identically.

[0032] The object is further achieved by a stabilizer assembly for a chassis of a motor vehicle, comprising a stabilizer as described above and at least one connecting element detachably connected to the coupling element. The stabilizer can have two connecting elements, each detachably connected to a coupling element. The connecting element can be, for example, a ball stud of a coupling rod. The stabilizer assembly can be connected to the vehicle body by means of one or more connecting clamps.

[0033] The object is further achieved by a method for producing a stabilizer according to one of the above embodiments for a chassis of a motor vehicle, comprising the steps: - Inserting the coupling element into the end section of the stabilizer tube, wherein an annular gap is formed between the insertion section and the stabilizer tube and the joining section comes into contact with the end section, and - connecting the coupling element to the stabilizer tube via a welded joint created by capacitor discharge welding or by laser beam welding between the joining section and the stabilizer tube, and - Bending of the stabilizer tube after guiding the coupling element.

[0034] The stabilizer tube is cut to length before inserting the coupling element to create the end section. The stabilizer tube can be cut to length by sawing, and deburring can be performed to create a defined edge. Theoretically, the stabilizer tube can also be bent before connecting to the coupling element.

[0035] Preferred embodiments of the invention are explained below with reference to the drawings. The drawings show, in schematic form: Fig. 1 a perspective view of a stabilizer according to the invention for a chassis of a motor vehicle with a stabilizer tube and two coupling elements in a first embodiment; Fig. 2 a sectional view of a first end portion of the stabilizer of Fig. 1; Fig. 3A is a perspective view of the coupling element of Fig. 1 and Fig. 2; Fig. 3B a sectional view of the coupling element of Fig. 3A; Fig. 4A a perspective view of a coupling element in a modified embodiment for a stabilizer analogous Fig. 1 to 3B; Fig. 4B a sectional view of the coupling element of Fig. 4A; Fig. 5 a stabilizer arrangement with the stabilizer of Fig. 1 and Fig. 2 and two connecting elements each connected to a coupling element and Fig. 6 a sectional view of the stabilizer assembly of Fig. 5 at the first end section of the stabilizer Fig. 7A is a perspective view of a stabilizer according to the invention for a chassis of a motor vehicle with a stabilizer tube and coupling element in a second embodiment; Fig. 7B is an enlarged view of the end section of the stabilizer from Fig. 7A; Fig. 7C the end section of the stabilizer Fig. 7A in longitudinal section; Fig. 8A the coupling element of the stabilizer from Fig. 7A in a first perspective view; Fig. 8B the coupling element of the stabilizer from Fig. 7A in a second perspective view; Fig. 8C the coupling element of the stabilizer Fig. 7A in axial view; Fig. 8D the coupling element according to section line 8D-8D Fig. 8A.

[0036] Fig. Figure 1 shows a schematic perspective view of a stabilizer 1 for a chassis of a motor vehicle in a first embodiment. The stabilizer 1 comprises a stabilizer tube 2 with a first end section 3 and a second end section 4.

[0037] Furthermore, the stabilizer 1 has a coupling element 5 inserted into the stabilizer tube 2 at the first end section 3 and a coupling element 5 inserted into the second end section 4. The coupling elements 5 each have a conical joining section 6 and a connecting means 7 for detachable connection to a connecting element 8 (cf. Fig. 5 and Fig. 6).

[0038] The stabilizer tube 2 and the coupling element 5 are formed from different, weldable materials, but are not limited thereto. For example, the stabilizer tube 2 can be made of a low-alloy case-hardening steel, and the coupling element 5 can be made of a structural steel.

[0039] The coupling elements 5 are, as in Fig. 2, each connected to the stabilizer tube 2 via a welded joint 30 produced by capacitor discharge welding between the conical joining section 6 and the stabilizer tube 2.

[0040] The arrangement of the coupling elements 5 on the stabilizer tube 2 is described below as an example for the coupling element 5 arranged on the first end section 3.

[0041] The stabilizer tube 2 has a first end face 9 arranged at the first end section 3 and a second end face 10 arranged at the second end section 4. The coupling element 5 is arranged on the first end face 9 of the stabilizer tube 2, and the welded joint 30 connects the conical joining section 6 of the coupling element 5 to an inner edge 11 of the stabilizer tube 2. The inner edge 11 of the stabilizer tube 2 is an edge of the first end face 9 adjacent to an interior space 12 of the stabilizer tube 2.

[0042] The coupling element 5 connected to the stabilizer tube 2 has a connection surface 13 that protrudes beyond the first end face 9 of the stabilizer tube 2 in the axial direction of the stabilizer tube 2 and can serve as a contact or clamping surface for the connection element 8. The connection surface 13 of the coupling element 5 is arranged, in particular, at a distance from and parallel to the first end face 9 of the stabilizer tube 2. Furthermore, the connection surface 13 of the coupling element 5 is larger than the cross-sectional area 14 of the stabilizer tube 2. The cross-sectional area of ​​the stabilizer tube 2 is defined as an annular surface 14 between an outer contour 16 and an inner contour 15.

[0043] The connecting surface 13 of the coupling element 5 can be larger than 1.5 times, in particular larger than twice, the annular surface 14 of the stabilizer tube 2. The annular surface 14 of the stabilizer tube 2 can, for example, have an outer diameter D14 of 10 to 50 mm, and the connecting surface 13 can, for example, have a diameter D13 of 15 to 80 mm.

[0044] In Fig. 3A and Fig. Figure 3B shows a first embodiment of the coupling element 5. The connecting means of the coupling element 5 is designed as an internal thread 7, here, for example, with a thread size of M8 to M14, and can be brought into engagement with a corresponding external thread 17 of the connecting element 8 (cf. Fig. 6).

[0045] The shape of the coupling element 5, i.e., length L of the coupling element 5 and diameter D13 of the connecting surface 13, can be designed depending on the thread size of the internal thread 7. The length L of the coupling element 5 is greater in the direction of a longitudinal axis A5 of the coupling element 5 than the outer diameter D14 of the annular surface 14 of the stabilizer tube 2. The length L of the coupling element 5 describes the axial distance between the connecting surface 13 and a bottom surface 18 of the coupling element 5.

[0046] The thread size of the internal thread 7 and the external thread 17 can be designed depending on the particular load case. For an internal thread 7 with a thread size of M8, the coupling element 5 can, for example, have a length L of 19 to 30 mm. Furthermore, for an internal thread 7 with a thread size of M14, the coupling element 5 can, for example, have a length L of 34 to 45 mm.

[0047] The coupling element 5 has an insertion section 19 extending in the direction of the longitudinal axis A5 of the coupling element 5 from the conical joining section 6 and arranged in the first end section 3 of the stabilizer tube 2. The insertion section 19 is formed closed at an end facing away from the joining section 6, ie at the bottom surface 18. Furthermore, the insertion section 19, as shown in Fig. 2, arranged coaxially in the stabilizer tube 2.

[0048] The coupling element 5 and the stabilizer tube 2 are not pressed together. In the radial direction relative to the longitudinal axis A5 of the coupling element 5, a radial gap 21 is provided between the insertion section 19 of the coupling element 5 and an inner wall 20 of the stabilizer tube 2.

[0049] The insertion section 19 has a lateral surface 22 arranged between the base surface 18 and the conical joining section 6. In the circumferential direction relative to the longitudinal axis A5 of the coupling element 5, the radial gap 21 has a substantially constant distance from the inner wall 20 of the stabilizer tube 2. For example, the radial gap 21 can have a radial extension LR of 0.1 to 0.5 mm.

[0050] The conical joining section 6 has a radial height 23 with respect to the longitudinal axis A5 of the coupling element 5, which can be twice to five times the thickness DW of the wall 24 of the stabilizer tube 2. The radial height 23 is understood to be half the distance between the largest diameter DV2 and the smallest diameter DV1 of the conical connecting section 6. The thickness DW of the wall 24 of the stabilizer tube 2 describes the distance between the inner wall 20 and an outer wall 25 of the stabilizer tube 2. For example, the wall 24 has a thickness DW of 1 mm to 4 mm, here, for example, less than 2 mm.

[0051] The radial height 23 can be designed depending on the required thread size of the internal thread 7. For example, the conical joining section can have a radial height 23 of 3 to 6 mm for an internal thread 7 with a size of M8, and a radial height 23 of 7 to 10 mm for an internal thread 7 with a size of M13.

[0052] The Fig. 4A and Fig. 4B show a second embodiment of the Fig. 1 to 3b. The same reference numerals are used for the same components or elements. Fig. 4A and Fig. 4B differs from the coupling element 5 shown in the Fig. 1 to 3B by a different design of the conical joining section 6 and a circumferential recess 27 reducing the connection surface 13.

[0053] In one method for producing the stabilizer 2, the stabilizer tube 2 is cut to length by sawing before the coupling elements 5 are arranged to create the end sections 3, 4. Further finishing of the end sections 3, 4 is not necessary. The coupling elements 5 are then arranged at the end sections 3, 4 in the stabilizer tube 2. The conical joining sections 6 are each in contact with the inner edge 11 of the stabilizer tube 2. To connect the coupling elements 5 to the stabilizer tube 2, a weld is created at the contact point between the conical joining section 6 and the stabilizer tube 2 using capacitor discharge welding. The stabilizer tube 2 is only bent after the stabilizer tube 2 has been welded to the coupling elements 5. Alternatively, the stabilizer tube 2 can be bent before the coupling elements 5 are welded to the stabilizer tube 2.

[0054] In the Fig. 5 and Fig. Figure 6 shows a stabilizer assembly 26 for a motor vehicle chassis, comprising a stabilizer 1 and two connecting elements in the form of ball studs 18 that are detachably connected to the coupling elements 5. The external thread 17 of the ball studs 18 is formed on a respective stud section 28. The external thread 17 has a thread size corresponding to the size of the internal thread 7. The stabilizer 1 is connected to a coupling rod 29 via the ball studs 18. Two connecting clamps 31 are arranged on the stabilizer tube 2.

[0055] The conical joining section 6 of the coupling elements 5 enables the coupling elements 5 to be connected to stabilizer tubes 2 of different diameters D14.

[0056] The Fig. 7A to 8D, which are described together below, show a stabilizer 1 according to the invention and a coupling element 5 in a further embodiment. The present embodiment corresponds in large parts to the embodiment according to the Fig. 1 to 3B, so that reference is made to the above description for short. Identical or corresponding details are provided with the same reference numerals as in the above figures.

[0057] The one in the Fig. The stabilizer 1 shown in Figures 7A to 8D differs from the above embodiments by a different design of the coupling element 5. As can be seen in particular from the Fig. As can be seen in Figures 8A to 8D, the coupling element 5 has a flange-shaped joining section 6, to which the insertion section 19 is axially connected. The coupling element 5 is inserted into the pipe with its longitudinal axis A5 coaxial with the pipe axis LS, with the flange section coming into contact with the end face of the pipe. The flange-shaped joining section 6 has a larger outer diameter DV2 than the end section 3 of the stabilizer tube 2. Furthermore, the insertion section 19 has a smaller outer diameter D19 than the inner diameter Di3 of the end section 3 of the stabilizer tube 2.

[0058] According to the invention, the welded joint 30 is formed by a weld seam circumferentially extending around the pipe axis LS or the longitudinal axis A5 of the coupling element 5 by means of laser welding. The laser beam is axially aligned and has a radial overlap with the end face 9 of the pipe end. In this way, the laser radiates axially through the flange section 6 into the end face of the pipe, so that the end face of the pipe fuses with the underside of the flange section and is joined by a material bond. The welding takes place in the circumferential direction as a ring-shaped, closed weld seam 30. As shown in particular in Fig. 7C, the weld seam 30 lies, in particular, radially outside a central ring line RL3 of the end section 3. The central ring line RL3 is an imaginary line which, viewed in axial view, is formed centrally between the outer peripheral edge and the inner peripheral edge of the pipe. The weld seam can have a weld seam diameter of less than 0.75 mm. Laser welding can efficiently produce welded joints with high precision. Laser welding offers the same advantages as capacitor discharge welding. The fact that the welding is performed on the end face ensures adaptation to different pipe dimensions via the support surface of the coupling element 5 or insert.

[0059] All features explained in connection with individual embodiments of the invention can be provided in different combinations for the stabilizer 1 and the stabilizer arrangement 26 as well as the method for producing the stabilizer 1 in order to realize their advantageous effects, even if these have been described for different embodiments. For example, the stabilizer arrangement 26 has coupling elements 5, which are also suitable for a stabilizer according to Fig. 1 can be used. Or, conversely, the coupling element can also be made of Fig. 1 for a stabilizer according to Fig. 5, Fig. 6 can be used. List of reference symbols 1 stabilizer 2 stabilizer tube 3 first final section 4 second final section 5 coupling element 6 Joining section 7 fasteners (internal thread) 8 Connecting element (ball stud) 9 first frontal surface 10 second front face 11 inner edge 12 Interior 13 Connection surface 14 Cross-sectional area (ring area) 15 Inner contour 16 Outer contour 17 external threads 18 floor area 19 Insert section 20 interior wall 21 Radial gap 22 lateral surface 23 Radial height 24 wall 25 exterior wall 26 Stabilizer arrangement 27 circumferential groove 28 tenon section 29 Coupling rod 30 welded joint 31 Connection clamp A5 axis D13 Diameter of the connection surface D14 Diameter of the annular surface of the stabilizer tube DV1 smallest diameter of the joining section DV2 largest diameter of the joining section DW wall thickness L Length of the coupling element LR Radial extension of the radial gap LS Longitudinal direction of the stabilizer tube QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] EP 3 508 361 A1

[0003] US 6,533,301 B1

[0004] FR 2 761 009 A1

[0005]

Claims

[1] Stabilizer for the chassis of a motor vehicle, comprising: a stabilizer tube (2) with an end section (3) and a tube axis (LS), and a coupling element (5) with a plug-in section (19), a conical joining section (6) and a connecting element (7) for detachably connecting a connection element (8), wherein the coupling element (6) with its insertion section (19) is arranged in the end section (3) of the stabilizer tube (2), wherein a radial gap (21) is formed between the insertion section (19) and an inner wall (22) of the stabilizer tube (2), and wherein the coupling element (6) is joined to the stabilizer tube (2) via a weld connection (30) produced by capacitor discharge welding between the conical joining section (6) and the stabilizer tube (2). [2] Stabilizer according to claim 1, characterized by, that the conical joining section (6) of the coupling element (5) is connected to an inner edge (11) on an end face (9) of the stabilizer tube (2) by means of the weld connection (30). [3] Stabilizer for the chassis of a motor vehicle, comprising: a stabilizer tube (2) with an end section (3) and a tube axis (LS), a coupling element (5) with a plug-in section (19), a flange-shaped joining section (6) and a connecting element (7) for detachably connecting a connection element (8), wherein the coupling element (6) with its insertion section (19) is arranged in the end section (3) of the stabilizer tube (2), wherein a radial gap (21) is formed between the insertion section (19) and an inner wall (20) of the stabilizer tube (2), and the flange-shaped joining section (6) has a larger outer diameter (DV2) than the end section (3) of the stabilizer tube (2), wherein the coupling element (5) is joined to the stabilizer tube (2) via an axial weld connection (30) produced by laser welding between the flange-shaped joining section (6) and an end face (9) of the stabilizer tube (2). [4] Stabilizer according to claim 3, characterized by , that the welded joint (30) is formed by a weld seam circumferentially around a longitudinal axis (A5) of the coupling element (5), which, viewed in cross-section through the end section (3), is arranged radially outside a mean annular line (RL3) of the end section (3). [5] Stabilizer according to claim 3 or 4, characterized by that the weld has a weld diameter of less than 0.75 mm. [6] Stabiliser according to any one of claims 1 to 5, characterized by, that the coupling element (5) has a connecting surface (13) projecting axially beyond the end of the stabilizer tube (2) in order to axially support the connecting element (8). [7] Stabilizer according to claim 6, characterized by , that the connection area (13) of the coupling element (5) is larger than a cross-sectional area (14) of the stabilizer tube (2). [8] Stabiliser according to any one of claims 1 to 7, characterized by , that the connecting element of the coupling element (5) is formed as an internal thread (7), in particular with a thread size of M8 to M14, and can be engaged with an external thread (17) of the connecting element (8). [9] Stabiliser according to any one of claims 1 to 8, characterized by , that a length (L) of the coupling element (5) in the longitudinal direction is greater than a diameter (D14) of the stabilizer tube (2). [10] Stabilizer according to any one of claims 1 to 9, characterized by, that the insertion section (19) is designed to be closed at an end facing away from the joining section (6). [11] Stabiliser according to any one of claims 1 to 10, characterized by , that the joining section (6) in the radial direction to the longitudinal axis (A5) of the coupling element (5) has a radial height (23) which is greater than 2 times and less than 5 times the wall thickness (DW) of the stabilizer tube (2). [12] Stabilizer according to at least one of claims 1 to 11, characterized by , that the stabilizer tube (2) and the coupling element (5) are made of different materials. [13] Stabilizer according to at least one of claims 1 to 12, characterized by, that a further coupling element (5) with a joining section (6) is arranged at a second end section (4) of the stabilizer tube (2) and is connected to the stabilizer tube (2) via a welded connection (30) created by welding between the joining section (6) and the stabilizer tube (2). [14] Method for manufacturing a stabilizer for a chassis of a motor vehicle according to any one of claims 1 to 13, comprising the steps: - Inserting the coupling element (5) into the end section (3) of the stabilizer tube (2), whereby an annular gap (21) is formed between the insertion section (19) and the stabilizer tube (2) and the joining section (6) comes into contact with the end section (3), - Connecting the coupling element (5) to the stabilizer tube (2) by means of capacitor discharge welding or laser beam welding, whereby a welded joint (30) is created between the joining section (6) of the coupling element (5) and the stabilizer tube (2), and - Bending of the stabilizer tube (2) after joining the coupling element (5) to the stabilizer tube.

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