Spindle drive with a clamping element, method for manufacturing the spindle drive

Abstract

The invention relates to a spindle drive (100) comprising a housing tube (110); a threaded spindle (120) partially arranged in the housing tube (110), wherein the threaded spindle (120) extends out of the housing tube (110) at one spindle end (111) of the housing tube (110); a drive device (130) arranged in the housing tube (110) for driving a rotation of the threaded spindle (120) about a longitudinal axis (L) of the threaded spindle (120) relative to the housing tube (110); and at least one clamping element (140) arranged at least partially in the housing tube (110). The housing tube (110) has a number of locking elements (112) and a stop surface (113) on its inner side, wherein the stop surface (113) is arranged at the spindle end (111) of the housing tube (110). The at least one clamping element (140) is materially connected to the housing tube (110) and clamps the drive device (130) along the longitudinal axis (L) against the stop surface (113).The drive device (130) or the at least one clamping element (140) has a number of counter elements (131), wherein the counter elements (131) interact positively with the locking elements (112) against a rotation of the drive device (130) about the longitudinal axis (L).

Description

Technical field

[0001] The invention relates to a spindle drive comprising a housing tube; a threaded spindle arranged partially in the housing tube, wherein the threaded spindle is led out of the housing tube at one spindle end of the housing tube; a drive device arranged in the housing tube for driving a rotation of the threaded spindle about a longitudinal axis of the threaded spindle relative to the housing tube; and at least one clamping element arranged at least partially in the housing tube.

[0002] The invention also relates to a method for manufacturing the spindle drive. State of the art

[0003] Spindle drives of the aforementioned type are known from the prior art, in which the drive device is fixed against displacements along the longitudinal axis and against rotations about the longitudinal axis by means of force-locking and / or form-locking modifications of the housing tube towards the longitudinal axis.

[0004] A disadvantage of this type of fixing is that forming operations are necessary at several points along the longitudinal axis to generate the required tension within the drive unit, ensuring backlash-free engagement of the drive unit's components. Furthermore, fixing by forming requires the housing tube to be made of metal to allow for sufficient plastic deformation. However, metal housing tubes are expensive, heavy, and susceptible to corrosion. Additionally, the forming operations create indentations on the outside of the housing tube, which are unsightly and promote dirt accumulation. To address this problem and provide corrosion protection, the housing tube of known spindle drives is surrounded by an additional plastic casing, which further increases the cost, space requirements, and weight of the spindle drive.

[0005] It is known to join certain components of a spindle drive by laser welding, namely a damping element of the spindle with a housing tube (CN 108360941 B), a bearing of the spindle with a housing tube (DE 10 2007 021 268 A1), a sheathing tube with a housing tube (EP 2 679 865 B1), a stop part of a spring with a housing tube (WO 2022 / 144057 A1) or a sealing cap with a housing tube (WO 2020 / 148357 A2). Technical task

[0006] The purpose of the invention is to create a particularly simple and lightweight spindle drive and a particularly fast and cost-effective manufacturing process for it. Technical solution

[0007] The present invention provides a spindle drive according to claim 1, which solves the technical problem. The problem is also solved by a method for manufacturing the spindle drive according to claim 11. Advantageous embodiments are the subject of the dependent claims.

[0008] The spindle drive comprises a housing tube, which is essentially hollow and cylindrical, for example. The housing tube is preferably made in one piece and / or from a plastic material. This allows for particularly cost-effective manufacturing of the housing tube, and it is lightweight and corrosion-resistant.

[0009] The spindle drive comprises a threaded spindle partially arranged in the housing tube, wherein the threaded spindle, in particular in a spindle tube, is led out of the housing tube at one spindle end of the housing tube and is preferably arranged coaxially to the housing tube.

[0010] The spindle drive comprises a drive device arranged in the housing tube for rotating the threaded spindle about a longitudinal axis of the threaded spindle relative to the housing tube. Preferably, a spindle nut is guided on the threaded spindle so as to be displaceable along the longitudinal axis relative to the housing tube and secured against rotation about the longitudinal axis. Thus, rotation of the threaded spindle about the longitudinal axis causes the spindle nut to be displaced along the longitudinal axis relative to the housing tube, enabling the spindle drive to move a first component connected to the spindle nut and a second component connected to the housing tube relative to each other along the longitudinal axis.

[0011] The spindle drive comprises at least one clamping element arranged at least partially within the housing tube. The clamping element is preferably made of plastic. This makes the clamping element particularly lightweight and cost-effective.

[0012] The housing tube has a number of locking elements and at least one stop surface on its inner side, the stop surface being located at the spindle end of the housing tube. The stop surface is formed, for example, by a shoulder of the housing tube that circumferentially surrounds the longitudinal axis and points towards the longitudinal axis. The shoulder is located, for example, at the spindle end of the housing tube. This allows all components of the spindle drive located within the housing tube to be easily inserted into the housing tube from a bottom end of the housing tube opposite the spindle end.

[0013] The at least one clamping element is bonded to the housing tube, for example by adhesive bonding, soldering, or welding, and clamps the drive unit along its longitudinal axis against the stop surface. This bonded connection eliminates the need to deform the housing tube to fix the drive unit along its longitudinal axis. Thus, the aforementioned disadvantages of fixing the unit through deformation are eliminated. Thanks to the stop surface, only a single clamping element is required to apply the necessary tension to the drive unit. This allows for particularly fast and cost-effective manufacturing of the spindle drive.

[0014] The drive device and / or the at least one clamping element has a number of counter elements, wherein the counter elements interact positively with the locking elements against a rotation of the drive device about the longitudinal axis.

[0015] The mating elements and locking elements are designed, for example, as grooves and webs aligned along the longitudinal axis, which interlock positively. These mating elements and locking elements secure the drive device simply and reliably against rotation about the longitudinal axis relative to the housing tube, thus ensuring the reliable operation of the spindle drive even when the drive device transmits a high torque to the threaded spindle. The material-bonded connection of the clamping element to the housing tube therefore does not need to provide anti-rotation protection, allowing for a simpler design.

[0016] The clamping element is preferably positively connected to the drive device to prevent rotation about the longitudinal axis. This reliably prevents the drive device from rotating about the longitudinal axis even if only the clamping element has counter-elements.

[0017] Preferably, the locking elements and the counter-elements are designed so that they do not impede movement of the drive device relative to the housing tube along the longitudinal axis, for example as grooves and webs along the longitudinal axis. This allows the drive device to be easily inserted into the housing tube along the longitudinal axis. Description of the execution types

[0018] The at least one clamping element is preferably welded to the housing tube, particularly preferably by laser welding. Welding, especially laser welding, allows the clamping element to be joined to the housing tube particularly quickly, and no additional adhesive is required. To enable laser welding, the housing tube and the clamping element are preferably made at least partially, and in particular entirely, of laser-weldable materials, especially laser-weldable plastics. The housing tube is preferably transparent to a laser beam used for laser welding, and the clamping element is preferably absorbing the laser beam. This allows the laser beam to be directed particularly easily from through a wall of the housing tube onto the clamping element to weld the clamping element to the housing tube.

[0019] The drive device preferably comprises a bearing section and a transmission section. The bearing section includes a bearing in which the threaded spindle is rotatably mounted about its longitudinal axis, and preferably a brake for braking the rotation of the threaded spindle. The transmission section comprises a gearbox for translating a torque generated by a motor of the drive device to drive the rotation of the threaded spindle, and preferably the motor and / or a control unit for the motor.

[0020] The at least one clamping element preferably comprises a first clamping element, for example a clamping ring, which is arranged between the bearing part and the gear part and clamps the bearing part along its longitudinal axis against the stop surface. The bearing part typically requires a higher clamping force than the gear part to function properly. This can be ensured by the first clamping element, which clamps only the bearing part. The gear part can, for example, be clamped against the first clamping element by a conventional end piece that is screwed into the housing tube at a bottom end opposite the spindle end.

[0021] Preferably, the bearing part and the gear part are positively connected to each other, particularly via the first clamping element, to prevent rotation about the longitudinal axis. For this purpose, the bearing part, the gear part, and / or the clamping element preferably have positive locking elements, for example, projections and corresponding recesses. Thanks to the positive locking connection, only at least one of the components—bearing part, gear part, and first clamping element—needs to have mating elements to secure the entire drive device to the housing tube against rotation about the longitudinal axis.

[0022] For the first clamping element, which is located deep inside the housing tube and is difficult to access due to its arrangement between the bearing part and the gearbox part, a connection to the housing tube by means of laser welding is particularly advantageous, whereby the laser beam can be applied through the outer wall of the housing tube.

[0023] The at least one clamping element preferably comprises a second clamping element, which is arranged on the side of the gear part facing away from the bearing part and clamps the gear part along its longitudinal axis against the first clamping element. The second clamping element can clamp the gear part against the first clamping element with a second clamping force, wherein the second clamping force may be different, in particular smaller, than a first clamping force with which the first clamping element clamps the bearing part against the stop surface.

[0024] The second clamping element, like the first, is bonded to the housing tube. Preferably, the first and second clamping elements are connected to the housing tube in the same way, making the spindle drive particularly easy to manufacture.

[0025] The second clamping element is preferably designed as a base piece that closes off a base end of the housing tube opposite the spindle end. This eliminates the need for a separate base piece, allowing for a particularly simple design of the spindle drive. The second clamping element, designed as a base piece, includes, for example, a connection element, in particular a ball socket, for connecting the spindle drive to a component to be moved by the spindle drive.

[0026] The second clamping element, designed as a base piece, is preferably connected to the housing tube in a liquid-tight manner by means of a material-bonded connection. Thus, no separate seal is required to prevent the ingress of liquid, such as water, between the second clamping element and the housing tube into the housing tube.

[0027] The counter elements are preferably arranged at an end region of the drive device adjacent to the spindle end of the housing tube. In this arrangement, the counter elements do not impede the insertion of the drive device from the bottom end into the housing tube. The counter elements are preferably arranged on the bearing part of the drive device.

[0028] The drive device preferably comprises a spindle tube radially surrounding the threaded spindle to its longitudinal axis, which preferably extends out of the housing tube at the spindle end. The spindle tube is, for example, essentially hollow cylindrical and / or arranged coaxially to the longitudinal axis of the threaded spindle. A spindle nut, threaded onto the threaded spindle, is slidably guided along the longitudinal axis within the spindle tube and positively secured against rotation about the longitudinal axis.

[0029] The spindle tube preferably includes at least one clamping section clamped between the drive device and the stop surface. The clamping section easily secures the spindle tube against displacement along the longitudinal axis of the threaded spindle.

[0030] The spindle tube preferably comprises a number of counter-elements, wherein the counter-elements interact positively with the locking elements of the housing tube to prevent rotation of the spindle tube about its longitudinal axis. This secures the spindle tube against rotation about its longitudinal axis in a simple manner, ensuring that the spindle nut is reliably secured within the spindle tube against rotation. The at least one clamping section of the spindle tube can be formed by the counter-elements of the spindle tube.

[0031] The spindle tube is, for example, positively connected to the other components of the drive device, in particular to the bearing part of the drive device, to prevent rotation about its longitudinal axis. In this way, the mating elements of the rest of the drive device can also prevent rotation of the spindle tube and / or the mating elements of the spindle tube can also prevent rotation of the rest of the drive device about its longitudinal axis relative to the housing tube. In one embodiment of the spindle tube with mating elements and a positive connection to the rest of the drive device, the rest of the drive device and / or the at least one clamping element can be designed without mating elements.

[0032] The spindle drive preferably comprises at least one sealing element arranged on the stop surface of the housing tube, for example a sealing ring, in particular arranged coaxially to the longitudinal axis of the threaded spindle, to prevent the ingress of liquids into the housing tube. The sealing element can be positioned on the stop surface particularly easily, in particular without additional positioning means.

[0033] The sealing element is preferably arranged between the housing tube and the spindle tube of the drive device, in particular between the stop surface of the housing tube and the clamping section of the spindle tube. In this way, the sealing element is reliably clamped between the housing tube and the spindle tube, which is clamped against the stop surface by the rest of the drive device, in particular via the clamping section of the spindle tube.

[0034] The method comprises manufacturing the spindle drive including providing the housing tube of the spindle drive, wherein the housing tube has on its inside a number of locking elements and a stop surface.

[0035] The method comprises arranging the threaded spindle of the spindle drive partially in the housing tube, such that the threaded spindle, in particular in a spindle tube, is led out of the housing tube at the spindle end of the housing tube.

[0036] The method involves inserting the drive device of the spindle drive into the housing tube from the bottom end of the housing tube opposite the spindle end.

[0037] The method involves positioning at least one clamping element of the spindle drive from the bottom end onto the drive device.

[0038] The procedure involves clamping the clamping element and the drive device against the stop surface.

[0039] The process involves joining the clamping element to the housing tube using a material-bonded connection, while the clamping element and the drive device are clamped against the stop surface. This process allows for the rapid and cost-effective production of the spindle drive.

[0040] In one embodiment of the spindle drive, wherein the drive device comprises a bearing part and a gear part, the bearing part comprising a bearing in which the threaded spindle is rotatably mounted about its longitudinal axis, the gear part comprising a gear for translating a torque generated by a motor of the drive device to drive the rotation of the threaded spindle, and wherein the at least one clamping element of the spindle drive comprises a first clamping element and a second clamping element, the method preferably comprises the following steps: a. Inserting the bearing part into the housing tube from the bottom end of the housing tube; b. Positioning the first clamping element from the bottom end on the bearing part; c. Clamping the first clamping element and the bearing part with a first clamping force against the stop surface; d. material-bonded connection of the first clamping element to the housing tube, while the first clamping element and the bearing part are clamped against the stop surface; e. Inserting the gearbox part into the housing tube from the bottom end of the housing tube; f. Positioning the second clamping element from the bottom end onto the gearbox part; g. Clamping the second clamping element and the gear part with a second clamping force against the first clamping element; and h. material-bonded connection of the second clamping element to the housing tube, while the second clamping element and the gear part are clamped against the first clamping element.

[0041] This embodiment of the method allows for the simple production of a spindle drive in which the bearing and gear components are subjected to different stresses, ensuring optimal performance of both. The first stress is preferably greater than the second. This guarantees backlash-free operation of the bearing component and prevents overloading of the gear component.

[0042] The clamping element, the first clamping element, and / or the second clamping element are preferably joined to the housing tube by welding, preferably by laser welding. In this way, the aforementioned components of the spindle drive can be joined quickly, reliably, and without additional materials such as adhesives.

[0043] The joining is preferably carried out by laser welding, wherein a laser beam is directed through a cladding wall of the housing tube onto the clamping element, the first clamping element, and / or the second clamping element. For this purpose, the housing tube preferably consists, at least partially, of a material transparent to the laser beam, for example, a plastic. The clamping element, first clamping element, and / or second clamping element preferably consists, at least partially, of a material that absorbs the laser beam, for example, a plastic, in particular the same plastic as the housing tube, with at least one laser beam-absorbing additive.

[0044] Preferably, the spindle drive is rotated around the longitudinal axis of the threaded spindle relative to the laser beam during the connection process. This allows the connection to be made continuously around the longitudinal axis, resulting in a particularly stable connection. The spindle drive and / or the laser beam can be rotated around the longitudinal axis relative to the surroundings of the spindle drive. The laser beam can be rotated by rotating a laser source or, with a stationary laser source, by rotating only the laser beam itself; for example, using a rotatable mirror arm, a rotatable optical waveguide, at least one rotatable mirror, and / or a mirror funnel. Brief description of the drawings

[0045] Further advantages, objectives and features of the invention are explained with reference to the following description and accompanying drawings, in which exemplary embodiments of the invention are shown. Fig. Figure 1 shows a schematic longitudinal section through one embodiment of the spindle drive. Fig. Figure 2 shows a schematic longitudinal section through the housing tube and the clamping elements of the spindle drive design. Fig. 1. Fig. 1

[0046] Fig. Figure 1 shows a schematic longitudinal section through an embodiment of the spindle drive 100 along the longitudinal axis L of the threaded spindle 120 of the spindle drive 100.

[0047] The spindle drive 100 shown comprises, for example, an essentially hollow cylindrical housing tube 110.

[0048] A threaded spindle 120 is partially arranged in the housing tube 110, wherein the threaded spindle 120 extends out of the housing tube 110 at a spindle end 111 of the housing tube 110 and is arranged, for example, coaxially to the housing tube 110.

[0049] A drive device 130 is arranged in the housing tube 110. The drive device 130 serves to drive a rotation of the threaded spindle 120 about a longitudinal axis L of the threaded spindle 120 relative to the housing tube 110.

[0050] At least one clamping element 140 is arranged at least partially in the housing tube 110.

[0051] The housing tube 110 has on its inside a number of locking elements 112, for example grooves aligned along the longitudinal axis L, and at least one stop surface 113, for example two stop surfaces 113 designed as ring shoulders, wherein the stop surfaces 113 are arranged at the spindle end 111 of the housing tube 110.

[0052] The at least one clamping element 140 is materially bonded, for example by laser welding, to the housing tube 110 and clamps the drive device 130 along the longitudinal axis L against the stop surface 113.

[0053] The drive device has a number of counter elements 131, for example in the form of webs aligned along the longitudinal axis L, wherein the counter elements 131 interact positively with the locking elements 112 against a rotation of the drive device 130 about the longitudinal axis L.

[0054] The drive device 130 shown comprises a bearing part 132 and a gear part 133, wherein the bearing part 132 comprises a bearing in which the threaded spindle 120 is rotatably mounted about its longitudinal axis L, and wherein the gear part 133 comprises a gear for translating a torque generated by a motor of the drive device 130 to drive the rotation of the threaded spindle 120.

[0055] In the embodiment shown, the at least one clamping element 140 comprises a first clamping element 140a, for example designed as a clamping ring, which is arranged between the bearing part 132 and the gear part 133 and clamps the bearing part 132 along the longitudinal axis L against the stop surface 113.

[0056] In the embodiment shown, the at least one clamping element 140 comprises a second clamping element 140b, which is arranged on the side of the gear part 133 facing away from the bearing part 132 and clamps the gear part 133 along the longitudinal axis L against the first clamping element 140a.

[0057] The second clamping element 140b is designed, for example, as a base piece that closes off a base end 114 of the housing tube 110 opposite the spindle end 111 of the housing tube 110. The second clamping element 140b, designed as a base piece, includes, for example, a connecting element 160, in particular a ball socket, for connecting the spindle drive 100 to a component to be moved by the spindle drive 100.

[0058] The counter elements 131 are arranged, for example, at an end region of the drive device 130 adjacent to the spindle end 111 of the housing tube 110, in particular at the bearing part 132.

[0059] The drive device 130 shown comprises a spindle tube 134 that surrounds the threaded spindle 120 radially to its longitudinal axis L, in particular coaxially. The spindle tube 134 shown includes a clamping section 135, for example in the form of a collar circumferential around the longitudinal axis L on the outside of the spindle tube 134, which is clamped between the drive device 130 and the stop surface 113, and a number of counter-elements 131, for example in the form of webs aligned along the longitudinal axis L. The counter-elements 131 interact with the locking elements 112 of the housing tube 110 in a positive-locking manner against rotation of the spindle tube 134 about the longitudinal axis L.

[0060] The spindle drive 100 shown comprises a sealing element 150, for example a sealing ring, arranged on the stop surface 113 of the housing tube 110 to prevent the ingress of liquids into the housing tube 110, wherein the sealing element 150 is arranged between the housing tube 110 and the spindle tube 134, in particular between the stop surface 113 of the housing tube 110 and the clamping section 135 of the spindle tube 134. Fig. 2

[0061] Fig. Figure 2 shows a schematic longitudinal section through the housing tube 110 and the clamping elements 140, 140a, 140b of the design of the spindle drive 100. Fig. 1 along the longitudinal axis L of the threaded spindle 120 of the spindle drive 100.

[0062] As opposed to Fig. 1 are in Fig. 2 The threaded spindle 120 and the drive device 130 with the spindle tube 134 are not shown. As a result, the stop surfaces 113 of the housing tube 110, for example in the form of ring shoulders circumferential around the longitudinal axis, and the locking elements 112 of the housing tube 110, for example in the form of grooves aligned along the longitudinal axis L, are visible.

[0063] Furthermore, in Fig. Two positive locking elements 141 of the first clamping element 140a, for example in the form of projections and / or recesses along the longitudinal axis L, are shown. The positive locking elements 141 allow the first clamping element 140a to be positively connected to the drive device 130, in particular to the bearing part 132 and / or the gear part 133 of the drive device, preventing rotation about the longitudinal axis L. List of reference symbols 100 spindle drive 110 Housing tube 111 Spindle end 112 Safety element 113 Stop surface 114 Bottom end 120 threaded spindle 130 Drive device 131 Counter-element 133 Gearbox part 134 Spindle tube 135 clamping section 140 clamping elements 140a first clamping element 140b second clamping element 141 Positive locking element 150 sealing elements 160 connection element 132 Bearing part L Longitudinal axis

Claims

Spindle drive (100) comprising: a. a housing tube (110); b. a threaded spindle (120) partially arranged in the housing tube (110), wherein the threaded spindle (120) extends out of the housing tube (110) at one spindle end (111) of the housing tube (110); c. a drive device (130) arranged in the housing tube (110) for driving a rotation of the threaded spindle (120) about a longitudinal axis (L) of the threaded spindle (120) relative to the housing tube (110); and d. at least one clamping element (140) arranged at least partially in the housing tube (110); characterized in that: e. the housing tube (110) has on its inside a number of locking elements (112) and a stop surface (113), wherein the stop surface (113) is arranged at the spindle end (111) of the housing tube (110); f.wherein the at least one clamping element (140) is materially connected to the housing tube (110) and clamps the drive device (130) along the longitudinal axis (L) against the stop surface (113); and wherein the drive device (130) and / or the at least one clamping element (140) has a number of counter elements (131), wherein the counter elements (131) interact positively with the locking elements (112) against rotation of the drive device (130) about the longitudinal axis (L). Spindle drive (100) according to claim 1, wherein the at least one clamping element (140) is welded to the housing tube (110). Spindle drive (100) according to claim 1 or 2, a. wherein the drive device (130) comprises a bearing part (132) and a gear part (133); b. wherein the bearing part (132) comprises a bearing in which the threaded spindle (120) is rotatably mounted about its longitudinal axis (L); c. wherein the gear part (133) comprises a gear for translating a torque generated by a motor of the drive device (130) to drive the rotation of the threaded spindle (120); and d. wherein the at least one clamping element (140) comprises a first clamping element (140a) which is arranged between the bearing part (132) and the gear part (133) and clamps the bearing part (132) along the longitudinal axis (L) against the stop surface (113). Spindle drive (100) according to claim 3, wherein the at least one clamping element (140) comprises a second clamping element (140b) which is arranged on the side of the gear part (133) facing away from the bearing part (132) and clamps the gear part (133) along the longitudinal axis (L) against the first clamping element (140a). Spindle drive (100) according to claim 4, wherein the second clamping element (140b) is designed as a bottom piece which closes off a bottom end (114) of the housing tube (110) opposite the spindle end (111) of the housing tube (110). Spindle drive (100) according to one of claims 1 to 5, wherein the counter elements (131) are arranged at an end region of the drive device (130) adjacent to the spindle end (111) of the housing tube (110). Spindle drive (100) according to one of claims 3 to 6, wherein the counter elements (131) are arranged on the bearing part (132) of the drive device (130). Spindle drive (100) according to one of claims 1 to 7, a. wherein the drive device (130) comprises a spindle tube (134) radially enclosing the threaded spindle (120) about its longitudinal axis (L); b. wherein the spindle tube (134) comprises a clamping section (135) clamped between the drive device (130) and the stop surface (113); and / or c. wherein the spindle tube (134) comprises a number of counter elements (131), wherein the counter elements (131) interact positively with the locking elements (112) of the housing tube (110) to prevent rotation of the spindle tube (134) about the longitudinal axis (L). Spindle drive (100) according to one of claims 1 to 8, wherein the spindle drive (100) comprises a sealing element (150) arranged on the stop surface (113) of the housing tube (110) to prevent the ingress of liquids into the housing tube (110). Spindle drive (100) according to claims 8 and 9, wherein the sealing element (150) is arranged between the housing tube (110) and the spindle tube (134). A method comprising the manufacture of a spindle drive (100) according to any one of claims 1 to 10, comprising the following steps: a. Providing the housing tube (110) of the spindle drive (100), wherein the housing tube (110) has on its inside a number of locking elements (112) and a stop surface (113); b. Arranging the threaded spindle (120) of the spindle drive (100) partially in the housing tube (110) such that the threaded spindle (120) extends out of the housing tube (110) at the spindle end (111) of the housing tube (110); c. Inserting the drive device (130) of the spindle drive (100) into the housing tube (110) from the bottom end (114) of the housing tube (110) opposite the spindle end (111); d. Positioning the at least one clamping element (140) of the spindle drive (100) from the bottom end (114) on the drive device (130); e. Clamping the clamping element (140) and the drive device (130) against the stop surface (113); and f.material-bonded connection of the clamping element (140) to the housing tube (110), while the clamping element (140) and the drive device (130) are clamped against the stop surface (113). The method of claim 11, wherein the drive device (130) comprises a bearing part (132) and a gear part (133); wherein the bearing part (132) comprises a bearing in which the threaded spindle (120) is rotatably mounted about its longitudinal axis (L); wherein the gear part (133) comprises a gear for translating a torque generated by a motor of the drive device (130) to drive the rotation of the threaded spindle (120); and wherein the at least one clamping element (140) of the spindle drive (100) comprises a first clamping element (140a) and a second clamping element (140b); wherein the method comprises the following steps: a. Inserting the bearing part (132) into the housing tube (110) from the bottom end (114) of the housing tube (110); b. Positioning the first clamping element (140a) from the bottom end (114) on the bearing part (132); c. Clamping the first clamping element (140a) and the bearing part (132) with a first clamping force against the stop surface (113); d.e. joining the first clamping element (140) to the housing tube (110) with a material bond while the first clamping element (140) and the bearing part (132) are clamped against the stop surface (113); e. inserting the gear part (133) into the housing tube (110) from the bottom end (114) of the housing tube (110); f. positioning the second clamping element (140b) on the gear part (133) from the bottom end (114); g. clamping the second clamping element (140b) and the gear part (133) with a second clamping force against the first clamping element (140a); and h. joining the second clamping element (140b) to the housing tube (110) with a material bond while the second clamping element (140b) and the gear part (133) are clamped against the first clamping element (140a). Method according to claim 12, wherein the first voltage is greater than the second voltage. Method according to one of claims 11 to 13, wherein the material-bonded joining of the clamping element (140), the first clamping element (140a) and / or the second clamping element (140b) to the housing tube (110) is carried out by welding. Method according to claim 14, wherein the joining is carried out by laser welding, wherein a laser beam is directed through a shell wall of the housing tube (110) onto the clamping element (140), onto the first clamping element (140a) and / or onto the second clamping element (140b).

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