Spindle drive for a closing element of a motor vehicle

Abstract

The invention relates to a spindle drive for a closure element of a motor vehicle, the spindle drive having a spindle-spindle nut transmission (7), the spindle-spindle nut transmission (7) having a spindle (7a) and a spindle nut (7b), the motor-side drive section (1a) having a drive unit (2) with a drive motor (3a) and a spindle (7a), the spindle (7a) being arranged downstream of the drive motor (3a), the spindle nut-side drive section (1a) of the spindle drive (1) The present invention relates to a spindle drive, in which the section (1b) has a spindle nut (7b), the spindle drive (1) has a drive casing (14) with at least one casing tube (14a) that is axially immovable with respect to the motor-side drive section (1a), and a guide tube (13) is arranged radially inside the casing tube (14a), which guide tube (13) is axially immovable with respect to the motor-side drive section (1a) and axially guides the drive components of the spindle drive (1) during the drive movement. It is proposed that the casing pipe (14a), which is axially immovable relative to the drive section (1a) on the motor side, and the guide pipe (13) are connected to one another in a form-locking manner in an assembly movement which comprises at least two successive partial movements, one partial movement being an axial movement of the pipe section (16) of the casing pipe (14a), which is axially immovable relative to the drive section (1a) on the motor side, relative to the pipe section (16) of the guide pipe (13), and the subsequent partial movement being a radial or tangential movement.

Description

[Technical Field]

[0001] The invention relates to a spindle drive for a closure element of a motor vehicle of the type described in the preamble of claim 1 .

[0002] The known prior art (DE 10 2017 117 993 A1) from which the present invention originates relates to a spindle drive for a closure element of a motor vehicle of the type described in the preamble of claim 1.

[0003] The spindle drive described above is used in the context of motorized adjustment of various closing elements of a motor vehicle. Such closing elements may be, for example, a tailgate, trunk lid, hood, floor plate of a luggage compartment, or a door, in particular a sliding door. In this respect, the term "closing element" is to be understood broadly in the context of the present invention.

[0004] Such a spindle drive serves to adjust such a closing element by means of a motor. For this purpose, the spindle drive has a drive unit with a drive motor and a spindle-spindle nut gear arranged downstream of the drive unit in drive technology, by means of which a linear drive movement is generated between the spindle-side drive connection and the spindle nut-side drive connection in order to open and close the closing element. In the open position of the closing element, the spindle drive is correspondingly in a run-out position, whereas in the closed position of the closing element, the spindle drive is in a run-in position.

[0005] Such spindle drives often also have a torsion tube that serves to guide the spindle nut axially, i.e., along the spindle axis, while the spindle nut is driven by the spindle. This torsion tube thus serves as a rotation stop for the spindle nut relative to the spindle-side drive connection and for the spindle nut-side drive connection relative to the motor-side drive connection. The torsion tube may additionally function as a spring guide tube and radially support and guide the coil spring that preloads the two drive connections relative to each other. This spring guide tube may also be provided instead of the torsion tube, especially if a corresponding rotation stop is provided elsewhere.

[0006] The challenge is to integrate such torsion tubes and / or spring guide tubes, hereinafter generally referred to as "guide tubes," into the spindle drive as inexpensively as possible. In particular, for torsion tubes, i.e., which must be immobile relative to the motor-side drive connection, the cost of the spindle drive increases due to the material that must be used for the torsion tube. The torsion tube is typically bonded or welded to the housing tube of the spindle drive, which is immobile relative to the motor-side drive section. This type of connection limits the material selection for the torsion tube to specific, and usually relatively expensive, materials.

[0007] The object of the present invention is to improve the known spindle drive for a closure element of a motor vehicle in order to achieve further optimization with respect to the above-mentioned objectives.

[0008] The above problem is solved by the features of claim 1.

[0009] Particularly preferred configurations are the subject of the dependent claims.

[0010] The key concept is to provide a form-locking connection to the housing tube in a spindle drive with a guide tube, which may be a torsion tube in particular, but also a spring guide tube in principle. This allows the selection of a guide tube material regardless of whether it allows for gluing or welding. Inexpensive materials such as PP (polypropylene) can be used. However, the guide tube may also be made of other plastic or metal materials. To create such a form-locking connection, an assembly movement is provided between the guide tube and the housing tube or between a section of the guide tube and a section of the housing tube. The assembly movement includes at least two partial movements, one of which is an axial movement and the subsequent partial movement is a radial or tangential movement between the two sections of the two tubes, or possibly between both tubes as a whole.

[0011] In particular, it is proposed that the casing pipe, which is axially stationary relative to the drive section on the motor side, and the guide pipe are positively connected to one another in an assembly movement that includes at least two consecutive partial movements, one partial movement being an axial movement of the pipe section of the casing pipe, which is axially stationary relative to the drive section on the motor side, relative to the pipe section of the guide pipe, and the subsequent, in particular the immediately following partial movement, being a radial or tangential movement.

[0012] The invention will now be explained in more detail with reference to the drawings, which show merely one embodiment. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a diagram showing a spindle drive device according to the present proposal. [Figure 2] 2A to 2C show different configurations of the tube section of the spindle drive shown in FIG. 1;

[0014] The drawings show in Figure 1 a spindle drive 1 according to the proposal, which is assigned to a closure element assembly, for example a tailgate assembly, which comprises a closure element, in this example a tailgate, which is assigned to a motor vehicle.

[0015] The closure element may, as mentioned at the beginning, be another closure element of the motor vehicle, in particular a trunk lid, but may also be a sliding door. All statements apply correspondingly to the other closure element.

[0016] 1 shows that the spindle drive 1 has a drive unit 2 for opening and closing a closure element. The drive unit 2 comprises several components 3, 4, 5 which are connected to one another in a torque-transmitting manner and arranged one behind the other in the axial direction X. The components 3, 4, 5, which will be described in more detail below, are axially fixedly supported in a drive unit casing 6 of the drive unit 2 in a casing tube 6a, which in FIG. 1 is called the motor tube 6a.

[0017] The drive unit 2 is driven by a spindle-spindle nut gear 7 having a geometric spindle axis A extending in the axial direction X, for generating a linear drive movement in a first adjustment direction, which corresponds in particular to the opening of the closure element, and a linear drive movement in a second adjustment direction, which corresponds in particular to the closing of the closure element.

[0018] The spindle-spindle nut transmission 7 of the spindle drive 1 is of a conventional type and comprises a rotating spindle 7a and a spindle nut 7b meshing with the spindle 7a. The spindle 7a is connected to the drive unit 2 via a connection assembly 8 in this embodiment.

[0019] The spindle drive 1 is divided into two drive sections 1 a, 1 b: the motor-side drive section 1 a with the drive unit 2 and the spindle 7 a, and the spindle nut-side drive section 1 b with the spindle nut 7 b. In this respect, the spindle 7 a and the spindle nut 7 b form the drive components of the spindle drive 1.

[0020] The drive unit 2 and the spindle-spindle nut transmission 7 are arranged in a power transmission line 9 which runs from a spindle-side drive connection 10a to a spindle-nut-side drive connection 10b. In this example, the spindle-side drive connection 10a is preferably connected axially and / or non-rotatably to the drive unit casing 6, in particular by crimping.

[0021] The spindle 7a is guided axially movably in a spindle guide tube 11, which is axially and non-rotatably connected to the spindle nut 7b and axially and, in this case, non-rotatably connected to the spindle nut-side drive connection 10b. The spindle nut 7b is likewise guided axially movably, and in this embodiment preferably non-rotatably, in a guide tube 13 of the spindle drive 1 formed as a torsion tube 12, which is arranged radially around the spindle 7a and axially and non-rotatably connected to the spindle-side drive connection 10a. To hold the spindle nut 7b non-rotatably, the torsion tube 12 preferably has one or more guide grooves (not shown) which in this embodiment preferably run parallel to the spindle axis A. Since the spindle nut 7b is prevented from rotating by the torsion tube 12, the rotational movement of the spindle 7a is converted via the spindle nut 7b into a translational movement of the spindle guide tube 11, which is connected to the spindle nut 7b in a non-rotatable manner. Correspondingly, the two drive sections 1a, 1b or drive connections 10a, 10b can be adjusted relative to one another in the axial direction X, i.e. along the spindle axis A.

[0022] The spindle drive 1 further comprises a casing 14, including a casing tube 14a, in particular an outer casing tube, which accommodates the spindle-spindle nut transmission 7, and preferably in this embodiment a further casing tube 14b, which is axially movable relative to the casing tube 14a and which is supported telescopically relative to the casing tube 14a, the casing tube 14a being axially fixedly connected, in this embodiment also non-rotatably, to the spindle-side drive connection 10a, and the casing tube 14b being axially fixedly connected, in this embodiment also non-rotatably, to the spindle-nut-side drive connection 10b. The casing 14, together with the drive unit casing 6, forms the drive casing of the spindle drive 1.

[0023] The drive unit casing 6 or motor tube 6a, which is axially rigidly connected to the spindle-side drive connection 10a, serves in this embodiment and preferably to accommodate the drive motor unit 3, the intermediate transmission unit 4 arranged drive-wise downstream of the drive motor unit and torque-transmittingly connected to it, and the additional component unit 5 arranged drive-wise downstream of the intermediate transmission unit 4 and torque-transmittingly connected to it. Basically, the drive unit 2 may have only one or only two of the aforementioned components 3, 4, and 5. The drive motor unit 3 preferably includes an electric drive motor 3a and a drive motor casing 3b. In this embodiment and preferably, the drive motor electronics 3c, which is also a component of the drive motor unit 3, is also arranged in the drive motor casing 3b. The intermediate transmission unit 4 includes a transmission component 4a and an intermediate transmission casing 4b. The additional component unit 5 preferably includes at least one additional component 5 a and an additional component casing 5 b. The additional component unit 5 preferably includes an overload protection clutch and / or brake unit in which each additional component 5 a is formed by an overload protection clutch and / or brake.

[0024] As shown in the drawing, the spindle-side drive connection 10a, the drive motor unit 3, the intermediate transmission unit 4, the additional component unit 5, the coupling assembly 8 with the arranged spindle 7a, and the torsion tube 12 are arranged successively in the axial direction X. All these components are axially immobile relative to the spindle-side drive connection 10a. The individual components are connected to each other in a torque-transmitting manner via clutches, in this example via pawl clutches. It should be noted that the above-described order of the individual components (drive motor unit 3, intermediate transmission unit 4, additional component unit 5, torsion tube 12) which are axially immobile relative to the spindle-side drive connection 10a is merely exemplary and may be entirely different.

[0025] The guide tube 13, configured as a torsion tube 12, in this embodiment and preferably also forms a spring guide tube, which is arranged radially inside at least one coil spring 15, which extends coaxially with respect to the geometric spindle axis A and which preloads both drive connections 10a, 10b against each other. The function of the spring guide tube is to radially support and axially guide the at least one coil spring 15. According to an alternative embodiment (not shown), such a spring guide tube inside the at least one coil spring 15 can also be configured without the function of a torsion tube 12, in which case the spindle nut 7b is preferably secured to its rotation by a lock at another point between the drive sections 1a, 1b, for example between the two casing tubes 14a, 14b.

[0026] The preferred embodiment shown in the drawings in this respect relates to a spindle drive 1 for a closure element of a motor vehicle, which has a spindle-spindle nut transmission 7, which has, as drive components of the spindle drive 1, a spindle 7a and a spindle nut 7b which meshes with the spindle 7a in order to generate a linear drive movement along a geometric spindle axis A, the motor-side drive section 1a of the spindle drive 1 has a drive unit 2 with a drive motor 3a and a spindle 7a, which is arranged downstream of the drive motor 3a, the spindle 7a being driven by the drive section 1b of the spindle drive 1 on the spindle nut side, which has the spindle nut 7b, and both drive sections 1a, 1b are each connected to drive connections 10a, 10b of the spindle drive 1 in order to introduce a drive movement; the drive unit 2 and the spindle-spindle nut transmission 7 are axially immovable relative to one another and are arranged one after the other along the geometric spindle axis A; the spindle drive 1 has a drive casing 14 with at least one casing tube 14a, in particular an outer casing tube, which is axially immovable relative to the motor-side drive section 1a; a guide tube 13 is arranged at least partially radially inside the casing tube 14a, which is axially immovable relative to the drive-side drive section 1a; the guide tube 13 is axially immovable relative to the motor-side drive section 1a and axially guides the drive components of the spindle drive 1 during the drive movement.

[0027] What is important here is that the casing pipe 14a, which is axially stationary relative to the motor-side drive section 14a, and the guide pipe 13 are connected to each other in a form-locking manner in an assembly movement that includes at least two consecutive partial movements, one partial movement being an axial movement of the pipe section 16 of the casing pipe 14a, which is axially stationary relative to the motor-side drive section 1a, relative to the pipe section 16 of the guide pipe 13, and the subsequent, in particular the immediately following partial movement, being a radial or tangential movement.

[0028] The terms "axial", "radial" and "tangential" hereinafter always relate to the coaxial longitudinal axes of both tubes, which extend coaxially to the spindle axis A in the final assembled state of the spindle drive 1. "Tangential" is used herein to mean a direction extending circumferentially about the longitudinal axis.

[0029] An axial motion is a motion with a predominantly axial component, i.e. the axial component is the largest and in particular the only component of the motion, whereas a radial motion is a motion with a predominantly radial component and a tangential motion is a motion with a predominantly tangential component.

[0030] During the assembly movement, i.e., during successive movements of several parts, the casing tube 14a, which is axially immovable relative to the motor-side drive section 1a, is moved relative to the guide tube 13, thereby allowing the guide tube 13 to be positioned axially immovable relative to the motor-side drive section 1a.

[0031] It should be emphasized here that the axial and radial or tangential partial movements can be carried out in direct succession, i.e. the radial or tangential partial movement directly follows the axial movement. However, it is also conceivable that the axial partial movement and / or the radial or tangential partial movement are preceded or followed by at least one further axial, radial or tangential partial movement, respectively, which partial movements are likewise part of the assembly movement.

[0032] By each tube section 16 is meant herein an axial, radial and / or circumferential tube section of each tube 13 or 14 a. Such a tube section 16 may be, for example, a locking hook 16 a ( FIG. 2 a) or a bent bar 16 b ( FIG. 2 b) formed by a circumferential section of each tube 13 or 14 a.

[0033] Each pipe section 16, in particular the axial pipe section 16, may be formed integrally with the remaining parts of the respective pipe 13 or 14a, but may also be a separate part from the remaining parts of the respective pipe 13 or 14a, which is only connected to the remaining parts of the respective pipe 13 or 14a during assembly, in particular in a form-locking, force-locking and / or material-locking manner, for example by gluing or welding.

[0034] 1, the lower left diagram exemplarily shows a guide tube 13 comprising two subsections 13a and 13b, subsection 13a forming the referred tube section 16, in particular the axial tube section 16, and subsection 13b forming the remainder of the tube 13. In this embodiment and preferably, the two subsections 13a and 13b are configured integrally with each other or separately from each other.

[0035] In the latter case, i.e., when the two sub-sections 13a and 13b are separate sub-sections 13a and 13b, the sub-section 13a forms an adapter for connecting the remaining section of the guide tube 13 to the casing tube 14a, which is axially immovable, in particular with respect to the motor-side drive section 1a. In this case, the two sub-sections 13a and 13b are connected to one another, in particular in a positive-, force-, and / or material-locking manner, for example in the preceding assembly step shown on the left side of the drawing. However, it is also conceivable in principle to connect the two sub-sections 13a, 13b, in particular in a positive-, force-, and / or material-locking manner, only if the casing tube 14a, which is axially immovable, in relation to the motor-side drive section 1a, and the tube section 16 or the sub-section 13a are connected to one another in a positive-, force-, and / or material-locking manner in the above-mentioned assembly movement, which includes at least two consecutive part movements.

[0036] The preferred embodiment shown in FIG. 1 further provides that the pipe section 16 of the casing pipe 14a is rigid relative to the rest of the casing pipe 14a and / or the pipe section 16 of the guide pipe 13 is rigid relative to the rest of the guide pipe 13, and that the pipe sections 16 of the casing pipe 14a and the guide pipe 13 are preferably connected to each other in an axially positively locking manner via a bayonet connection 17, and more preferably that the bayonet connection 17 is formed by, during the assembly movement, a radial protrusion on one of the pipe sections 16, in particular the pipe section 16 of the casing pipe 14a, being moved axially in a corresponding recess on the other pipe section 16, in particular the pipe section 16 of the guide pipe 13, in a first partial movement, being moved tangentially in a subsequent, in particular immediately following, second partial movement, and optionally being moved axially in the opposite direction in a subsequent, in particular immediately following, third partial movement.

[0037] "Axially positively locked" means in this context that a positively locked portion is provided in the direction opposite at least the first segment movement, in particular the direction opposite any third segment movement. Preferably, a tangentially positively locked portion is also provided here in the direction opposite the second segment movement. This has the advantage that both tubes, i.e. the aforementioned guide tube 13 and the aforementioned casing tube 14a, cannot rotate relative to one another.

[0038] "Axially opposite" means that the third partial movement is performed in the axial direction, i.e. parallel to the spindle axis A, in a direction opposite to the axial direction of the first partial movement.

[0039] In contrast, in the likewise preferred embodiment shown in FIG. 2a), the pipe section 16 of the casing pipe 14a can be elastically displaced relative to the rest of the casing pipe 14a and / or the pipe section 16 of the guide pipe 13 can be elastically displaced relative to the rest of the guide pipe 13 during axial and / or radial movements, and preferably the pipe sections 16 of the casing pipe 14a and the pipe sections 16 of the guide pipe 13 are connected to one another in an axially positive-locking manner via clip connections 18, which clip connections prevent the entire casing pipe 14a from being displaced relative to the guide pipe 13 during the assembly movement. It is further provided that the elastic locking hook 16a, which forms one of the pipe sections 16, in particular the pipe section 16 of the guide pipe 13, is moved axially relative to the other pipe section 16, in particular the pipe section 16 of the casing pipe 14a, in a first partial movement to a position radially displaced from its basic position, and is then moved radially from the displaced position to, in particular into, the basic position of the locking hook in a subsequent, in particular immediately following, second partial movement.

[0040] "Elastically displaceable" in this embodiment and hereinafter means that the pipe section 16 of each pipe 13 or 14a may be pushed from the basic position it occupies in an unloaded state to a displaced position by the force applied by the pipe section 16 of the other pipe 14a or 13 during each partial movement, and when the force previously acting after the end of the previous partial movement that caused the displacement decreases or disappears again, due to elasticity, it can automatically move back towards the basic position again, preferably into the basic position again.

[0041] The clip connection 18 can also be realized by a corresponding counter element, in particular by a specific corresponding counter element for each locking hook 16a, for example by an individual locking hook 16a with a locking receptacle. Such a clip connection 18 has the advantage that the tubes 13, 14a cannot rotate relative to one another. A clip connection 18 in the form of an annular snap connection is also conceivable.

[0042] "Axially positively-locking" means in this example that positively-locking portions are provided at least in the direction opposite to the first segment movement, but especially also in the direction of the first segment movement. In principle, positively-locking portions in the tangential direction may also be provided.

[0043] In a likewise preferred embodiment shown in FIG. 2b), it is finally provided that the pipe section 16 of the casing pipe 14a is elastically displaceable relative to the rest of the casing pipe 14a and / or the pipe section 16 of the guide pipe 13 is elastically displaceable relative to the rest of the casing pipe 14a during axial and / or tangential movements, and preferably the pipe sections 16 of the casing pipe 14a and the pipe sections 16 of the guide pipe 13 are axially positively connected to one another via a locking connection 19, which is provided by a radially projecting pin 20 at the distal end, which is provided to be axially displaceable relative to the rest of the casing pipe 14a and / or the guide pipe 13 during at least a part of the assembly movement. In the first partial movement, an elastic bending bar 16b forming one pipe section 16, in particular the pipe section 16 of the guide pipe 13, with a pin 20 running in a correspondingly arranged pin guide groove 21 of the other pipe section 16, in particular the pipe section 16 of the casing pipe 14a, is moved axially in its basic position relative to the other pipe section 16, in particular the pipe section 16 of the casing pipe 14a, in a subsequent, in particular immediately following, second partial movement, it is moved from its basic position to a position displaced tangentially, and in a subsequent, in particular immediately following, third partial movement, it is moved tangentially from the displaced position towards its basic position, in particular into its basic position.

[0044] By bending bar 16b is meant an elongated, i.e. bar-shaped, elastically bendable section of material of the respective tube 13 or 14a.

[0045] The "distal" end is defined herein as the end that is the furthest displaceable end from the opposite end where bending bar 16b is attached to the rest of tube 13 or 14a, and is therefore the "proximal" end.

[0046] "Axially positively connected" means in this context that a positive connection occurs at least in the direction opposite to the first segment movement, but especially also in the direction of the first segment movement. In principle, a positive connection in the tangential direction may also be provided.

[0047] 2b), the bending bar 16b may be provided at its proximal end or at the tube section 16 axially adjacent to it with a radially projecting guide block 22, which, after the last partial movement, is also introduced into the pin guide groove 21, so that a tangential positive connection between the tubes 13, 14a can also be achieved. However, it is also conceivable in principle that the tangential positive connection can be achieved exclusively via the radially projecting pin 20.

[0048] The terms "pin" and "guide block" are to be understood broadly in this specification and mean protrusions that protrude radially outward or inward and are suitable for being guided in or through the pin guide groove 21.

[0049] It is furthermore provided in this embodiment and preferably within the framework of a pre-assembly step in which the spindle-spindle nut transmission 7 is pre-assembled to form a pre-assembly unit, that a partial movement can be carried out, and that an axially rigid connection between the pre-assembled spindle-spindle nut transmission 7 and, in particular, the drive unit 2 which is pre-assembled to form the pre-assembly unit can be formed in a final assembly step following the partial movement, preferably the axially rigid connection formed in the final assembly step can be a material-, force- and / or form-locking connection, more preferably the axially rigid connection formed in the final assembly step can be a welded and / or adhesive connection between the casing tube 14a and the guide tube 13, which is axially rigid with respect to the motor-side drive section 1a.

[0050] That is, the axially immovable housing tube 14a, the guide tube 13 and the drive unit housing 6, in particular the motor tube 6a, are correspondingly configured relative to the motor-side drive section 1a, so that the above-mentioned movement sequence can be carried out.

Claims

1. A spindle drive for a closure element of a motor vehicle, the spindle drive (1) having a spindle-spindle nut transmission (7), the spindle-spindle nut transmission (7) having, as drive components of the spindle drive (1), a spindle (7a) and a spindle nut (7b) meshing with the spindle (7a) to produce a linear drive movement along a geometric spindle axis (A), the spindle drive (1) The motor-side drive section (1a) comprises a drive unit (2) with a drive motor unit (3) having a drive motor (3a) and the spindle (7a), the spindle (7a) being disposed downstream of the drive motor (3a), and the spindle nut-side drive section (1b) of the spindle drive (1) comprises the spindle nut (7b), and both drive sections (1a, 1b) each comprise a drive unit (2) with a drive motor unit (3) having a drive motor (3a) and the spindle (7a) being disposed downstream of the drive motor (3a). The spindle drive (1) is connected to the drive connection (10a, 10b) of the spindle-spindle nut transmission (7) in such a way that the drive unit (2) and the spindle-spindle nut transmission (7) are axially immovable relative to one another and are arranged one after the other along the geometrical spindle axis (A), and the spindle drive (1) comprises a drive unit casing (6) having a motor tube (6a) for accommodating the drive motor unit (3) and at least one drive section (1a) in the axial direction immovable relative to the motor-side drive section (1a). A spindle drive having a drive casing (6, 14) with a casing tube (14a), in which a guide tube (13) is arranged at least partially radially inside the casing tube (14a), which is axially immovable relative to the motor-side drive section (1a), and which guide tube (13) is axially immovable relative to the motor-side drive section (1a) and axially guides drive components of the spindle drive (1), during the drive movement, the housing pipe (14a), which is axially immovable relative to the motor-side drive section (1a), and the guide pipe (13) are connected to one another in a form-locking manner in an assembly movement which includes at least two successive partial movements, 1. A spindle drive device, characterized in that one partial movement is an axial movement of the pipe section (16) of the casing pipe (14a) relative to the pipe section (16) of the guide pipe (13), which is axially immobile with respect to the motor-side drive section (1a), and the subsequent partial movement is a radial or tangential movement.

2. 2. The spindle drive according to claim 1, wherein the pipe section (16) of the housing pipe (14a) and the pipe section (16) of the guide pipe (13) are connected to each other in an axially positively locking manner via a bayonet connection (17).

3. The bayonet coupling (17) During the assembly movement, a radial protrusion on one of the pipe sections (16) is moved axially in a first partial movement within a corresponding recess on the other pipe section (16), and 3. The spindle drive according to claim 2, wherein the second subsequent partial movement is effected by a tangential movement.

4. 4. The spindle drive device according to claim 3, wherein during the assembly movement, a radial protrusion provided on one of the pipe sections (16) is moved in a subsequent third partial movement in an axially opposite direction to the first partial movement within a correspondingly arranged recess provided on the other pipe section (16).

5. 5. The spindle drive according to claim 1, wherein the pipe section (16) of the casing pipe (14a) is elastically displaceable relative to the remaining part of the casing pipe (14a) and / or the pipe section (16) of the guide pipe (13) is elastically displaceable relative to the remaining part of the guide pipe (13) during the axial and / or radial movement.

6. 6. The spindle drive according to claim 5, wherein the pipe section (16) of the casing pipe (14a) and the pipe section (16) of the guide pipe (13) are connected to one another in an axially positive-locking manner via a clip connection (18), the clip connection (18) being formed in such a way that during the assembly movement, the entire casing pipe (14a) is moved axially relative to the guide pipe (13), whereby a resilient locking hook (16a) forming one of the pipe sections (16) is moved axially along the other pipe section (16) from its displaced position to a radially extended position in a first partial movement and then moved radially from the displaced position towards the basic position of the locking hook (16a) in a subsequent second partial movement.

7. 5. The spindle drive according to claim 1, wherein the pipe section (16) of the casing pipe (14a) is elastically displaceable relative to the remaining part of the casing pipe (14a) and / or the pipe section (16) of the guide pipe (13) is elastically displaceable relative to the remaining part of the guide pipe (13) during the axial and / or tangential movement.

8. the pipe section (16) of the casing pipe (14a) and the pipe section (16) of the guide pipe (13) are connected to one another in an axially positively locked manner via a locking connection (19), which locks the entire casing pipe (14a) relative to the guide pipe (13) during the assembly movement, and a resilient bending bar (16b) forming one of the pipe sections (16) with a radially projecting pin (20) at its distal end, the pin (20) running in a correspondingly arranged pin guide groove (21) of the other pipe section (16) during at least a part of the assembly movement, In a first partial movement, it is moved axially in its basic position relative to the other pipe section (16), in a subsequent second partial movement, it is moved from the basic position to a position displaced tangentially, and 8. The spindle drive according to claim 7, wherein the subsequent third partial movement is formed by moving from the displaced position in a tangential direction towards the base position.

9. 9. The spindle drive according to claim 1, wherein the partial movement can be performed within a pre-assembly step in which the spindle-spindle nut transmission (7) is pre-assembled to form a pre-assembled unit, and wherein an axially immovable connection between the pre-assembled spindle-spindle nut transmission (7) and the drive unit (2) can be formed in a final assembly step following the partial movement.

10. 10. The spindle drive according to claim 9, wherein the axially immovable connection formed in the final assembly step is a material-, force- and / or form-locking connection.

11. 11. Spindle drive according to claim 10, characterized in that the axially immovable connection formed in the final assembly step is a welded and / or adhesive connection between the casing tube (14a) and the guide tube (13) that is axially immovable relative to the motor-side drive section (1a).

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