DE102018002876A1 - Spindle drive for a closure element of a motor vehicle - Google Patents

Abstract

The invention relates to a spindle drive (1) for a closure element (3) of a motor vehicle (4), wherein a drive unit (5) and a drive spindle (5) drive downstream, a spindle (6a) and spindle nut (6b) having spindle spindle nut Gearbox (6) is provided with a geometric spindle axis (A) extending in the axial direction (X) for generating linear drive movements between a spindle-side drive connection (8a) and a spindle nut-side drive connection (8b), wherein the spindle drive (1) comprises a brake arrangement (12). wherein the brake assembly (12) opposes the adjustment of at least two components of the spindle drive (1) relative to each other, which move axially relative to each other according to the linear drive movements. It is proposed that the braking effect of the brake arrangement (12) is generated directly between the two components of the spindle drive (1), that one of the two axially movable components has a friction device (13) with at least one friction element (14) and that the friction element (14 ) translates in the adjustment to another of the two axially movable components and thereby generates a braking action parallel to the spindle axis (A)

Description

The present invention relates to a spindle drive for a closure element of a motor vehicle according to the preamble of claim 1 and to a closure element arrangement of a motor vehicle having such a spindle drive according to claim 15.

The spindle drive in question is used in the context of motorized adjustment of any closure elements of a motor vehicle. Such closure elements may be, for example, tailgates, trunk lids, hoods, load compartment floors, but also doors, in particular sliding doors, of a motor vehicle. In that regard, the term "closure element" is to be understood in the present case.

The known spindle drive ( DE 10 2014 114 617 A1 ), from which the invention proceeds, is used for the motorized adjustment of a tailgate of a motor vehicle. The spindle drive has an electric drive unit and a spindle spindle nut gear drive downstream of the electric drive unit, with which linear drive movements for opening and closing the closure element between a spindle-side drive connection and a spindle-side drive connection are generated. A brake assembly of the spindle drive allows on the one hand a secure holding the tailgate in intermediate positions and on the other hand, a manual adjustment of the tailgate after overcoming the braking force of the brake assembly.

The structural design of the known spindle drive with brake assembly basically ensures a relatively high reliability and in terms of manual adjustability a high degree of user comfort. A challenge is, however, the placement of the components of the brake assembly. Thus, it is in the brake assembly of the known spindle drive to a rotationally acting brake assembly, which is positioned between the electric drive unit and the spindle-spindle nut transmission. The components of the brake assembly accordingly take in the axial direction, that is along the geometric spindle axis, a relatively large amount of space, thereby increasing the technical dead length of the spindle drive, which in turn leads to increased space requirements in the motor vehicle.

The invention is based on the problem, the known spindle drive to design and further develop that the space requirement is reduced in the motor vehicle.

The above problem is solved in a spindle drive according to the preamble of claim 1 by the features of the characterizing part of claim 1.

It is essential to fundamentally decelerate two such components, which move relative to one another in accordance with the linear drive movements, which therefore execute a movement parallel to the geometric spindle axis relative to each other. Thus, two axially movable components are braked relative to each other by means of the brake assembly. Accordingly, the brake assembly can be arranged in the region radially between the two mutually movable components of the spindle drive, whereby the technical dead length of the spindle drive, so its length in the axial direction along the geometric spindle axis, can be reduced. Preference is given here anyway used existing space between the two relatively movable components, so that the radial extent of the spindle drive and the housing of the spindle drive is not increased. In this way, a particularly compact structural design of the spindle drive is made possible, while continuing to ensure a high degree of operational reliability and a high level of user comfort.

The special structure of the proposed spindle drive has the further advantage that the brake assembly and its transmission elements are no longer directly in the power flow of the drive train, whereby the transmission elements of the brake assembly must absorb less large loads, which ultimately increases the efficiency. In addition, the axial tolerance chain is reduced, whereby noise and wear can be reduced.

Specifically, it is quite generally proposed that the braking effect of the brake assembly is generated directly between the two components of the spindle drive, that one of the two axially movable components having a friction device with at least one friction element and that the friction element translationally when adjusting on another of the two axially movable components along and thereby generates a braking action parallel to the spindle axis. In particular, a friction device is provided only on one of the two axially movable components, which exerts or transmits a braking action, in particular a braking force and / or a braking torque, to the respective other of the two axially movable components. In principle, however, it is conceivable that each of the two axially movable components each one such Having friction device which acts on the respective other of the two components.

According to an embodiment according to claim 2 rubs the respective friction element in the adjustment - meaning the adjustment of the two axially movable components relative to each other - in addition also rotationally along the respective other component. As a result, a braking effect is additionally generated around the spindle axis. In principle, however, the brake arrangement can also be designed such that the respective friction element exclusively produces a braking action parallel to the spindle axis, that is to say a translatory or axial braking action. In this case, the braking effect generated together by the translational Entlangreiben and optionally rotational Entlangreib is in particular the decisive braking effect, which counteracts the adjustment of the two axially movable components of the spindle drive. By "decisive braking effect" is meant that in addition to this braking action in the spindle drive always inevitably a basic friction, also called internal friction, including a possible braking effect of the possibly existing drive motor is present, which also has a braking effect, but to a lesser extent. In the event that no drive motor is present in the spindle drive, the braking effect generated by the translational Entlangreiben and optionally rotational Entlangreib is in particular the essentially only braking effect, which counteracts the adjustment of the two axially movable components of the spindle drive. The braking effect which is produced with the brake arrangement described above, however, is in particular at least 1.5 times greater, preferably at least 2 times greater, more preferably at least 6 times greater, more preferably at least 10 times greater, than the background friction and possibly drive motor-related braking effect ,

According to a further embodiment according to claim 3, the at least one friction element to achieve the braking effect radially in contact with the surface of the respective other component. In particular, these are the inner surface of the respective other component.

The claims 4 to 7 define particularly preferred embodiments of the brake assembly. Thus, the component on which drives the at least one friction element, a pipe (claim 4), in particular the spindle guide tube of the spindle drive (claim 5). Additionally or alternatively, the torsion tube (claim 6) and / or the drive tube (claim 7) may be the component on which the respective friction element rubs.

According to the preferred embodiment according to claim 8, the brake assembly can generate a path-dependent braking effect, ie a braking action varying over the braking distance, and according to claim 9, the brake assembly can generate a direction-dependent braking effect, ie a braking effect, which is different depending on the adjustment of the spindle drive.

After the embodiment according to claim 10, the braking effect is adjustable. An adjustment of the braking effect can in particular be made directly on the friction device, for example by the friction element more or less compressed, in particular axially compressed, and / or more or less greatly expanded, in particular radially expanded, is. This can be done for example via a screw that exerts a force permanently on the respective friction element.

Preferred embodiments of the friction device, which in addition to the friction element in particular may also have a sleeve-shaped element as a base, are defined in claims 11 to 13.

According to the further embodiment according to claim 14, the friction device can also be adjacent to one or two stop nuts or arranged on a stop nut. In particular, the friction device is arranged between two stop nuts. An abutment nut is an element that is mounted on an end portion of one of the components, in particular the spindle, and axially damps the abutment of this component on another component or a housing portion of the spindle drive.

In addition, the object described above is achieved by a closure element arrangement of a motor vehicle according to claim 15.

This further teaching has independent significance. In the proposed closure element arrangement, the same advantages as above are achieved in connection with the spindle drive. Reference may be made to all versions of the proposed spindle drive.

• 1 den Heckbereich eines Kraftfahrzeugs mit einem vorschlagsgemäßen Spindelantrieb für die dortige Klappenanordnung,
• 2 den Spindelantrieb gemäß 1 in a) einer eingefahrenen Stellung und b) einer ausgefahrenen Stellung,
• 3 in a) bis d) verschiedene Ausführungsbeispiele einer Reibeinrichtung für eine Bremsanordnung,
• 4 in a) bis d) weitere Ausführungsbeispiele einer Reibeinrichtung für eine Bremsanordnung und
• 5 in a) bis d) noch weitere Ausführungsbeispiele einer Reibeinrichtung für eine Bremsanordnung

In the following the invention will be explained in more detail with reference to a drawing illustrating only embodiments. In the drawing shows

• 1 the rear area of a motor vehicle with a proposed spindle drive for the local flap arrangement,
• 2 the spindle drive according to 1 in a) a retracted position and b) an extended position,
• 3 in a) to d) different embodiments of a friction device for a brake assembly,
• 4 in a) to d) further embodiments of a friction device for a brake assembly and
• 5 in a) to d) yet further embodiments of a friction device for a brake assembly

The proposed spindle drive 1 is a closure element arrangement 2 , in 1 For example, a tailgate assembly, assigned, in turn, with a closure element 3 , here a tailgate, is equipped. The closure element arrangement 2 is a motor vehicle 4 assigned.

In the closure element 3 It may also be another closure element as mentioned above 3 of a motor vehicle 4 , in particular a trunk lid, but also a sliding door act. All versions apply accordingly to other closure elements.

2 shows that for opening and closing the closure element 3 the spindle drive 1 the closure element arrangement 2 of a motor vehicle 4 a drive unit 5 , Here and preferably with a particular electric drive motor 5a and an optional intermediate gearbox 5b , and one of the drive unit 5 Drive-driven downstream spindle-spindle nut gearbox 6 with in a axial direction X extending geometric spindle axis A for generating linear drive movements in a first adjustment direction, in particular an opening of the closure element 3 corresponds, and in a second adjustment direction, in particular a closing of the closure element 3 corresponds, has.

Generally, it is advantageous if the first adjustment direction the opening of the closure element 3 corresponds when the closure element 3 a tailgate or a trunk lid, since the opening then already against the weight of the closure element 3 happens. Nevertheless, embodiments are conceivable in which the opening should be slowed down. In particular, in the case of sliding doors, provision may be made for the first adjustment direction to close the corresponding closure element 3 equivalent. The geometric spindle axis A refers to the spindle drive 1 , On the closure element 3 or the motor vehicle 4 can the spindle drive 1 be arranged quite displaceable.

The drive unit 5 and the spindle-spindle nut transmission 6 are in a powertrain 7 arranged, extending from a spindle-side drive connection 8a to a spindle nut side drive connection 8b extends.

The spindle-spindle nut transmission 6 of the spindle drive 1 is in a conventional manner with a rotating spindle 6a and a spindle nut screwed into engagement therewith 6b fitted. The spindle 6a is, here on the intermediate gear 5b , with the drive motor 5a coupled. The spindle 6a is in a spindle guide tube 9 guided axially movable, wherein the spindle guide tube 9 with the spindle nut 6b is rotatably connected and with the spindle nut side drive connection 8b , here rotatably, is coupled.

The spindle nut 6b is again in a torsion tube 10 of the spindle drive 1 axially movable and here and preferably rotatably guided, wherein the torsion tube 10 radially around the spindle 6a is arranged around and with the spindle-side drive connection 8a , here rotatably, is coupled. To the spindle nut 6b in the torsion tube 10 rotatably holding, has the torsion tube 10 here and preferably one or more guide grooves (not shown), which here and preferably parallel to the spindle axis A run. Because the spindle nut 6b from the torsion tube 10 rotatably held, is a rotational movement of the spindle 6a over the spindle nut 6b in a translational movement of the with the spindle nut 6b rotatably coupled spindle guide tube 9 transformed. Accordingly, at least two components of the spindle drive can be in the axial direction X that is along the spindle axis A , adjust relative to each other.

The spindle drive 1 also has a housing 11 comprising a drive tube 11a and a telescopically guided output tube therein 11b on, with the drive tube 11a with the spindle-side drive connection 8a and the output tube 11b with the spindle nut side drive connection 8b is coupled.

The spindle drive 1 also has a brake assembly 12 on, the adjustment of at least two components of the spindle drive 1 which move axially relative to one another according to the linear drive movements relative to each other. It is proposed according to provided that the braking effect of the brake assembly 12 which counteracts said displacement is generated directly between the two components. The brake assembly 12 is thus configured such that a braking action is exerted by the one of the components directly on the respective other of the components. The two axially movable components are in particular from the group of components of the spindle drive 1 chosen, comprising the spindle 6a , the spindle nut 6b , the Spindle guide tube 9 , the torsion tube 10 , the drive tube 11a and the output tube 11 b.

At least one of the two axially movable components has a friction device 13 with at least one friction element 14 on, wherein the friction element 14 can be formed in one piece or multiple parts. The friction element 14 rubs in the adjustment to the respective other of the two axially movable components translationally, that is axially, along, whereby a braking action parallel to the spindle axis A is produced. Here and preferably rubs the friction element 14 in addition also rotationally along the respective other component along, whereby additional a braking effect about the spindle axis A is generated around. Other brake assemblies, such as pneumatic or hydraulic brake assemblies, are not provided here and preferably. This does not exclude that in the spindle drive 1 in addition to the above-described, according to the proposal provided braking effect also an inevitable basic friction between the components of the spindle drive 1 including a certain braking effect of the drive motor 5a is present, which also, but to a lesser extent, has a braking effect. Here and preferably, the aforementioned intended braking effect, ie in the exemplary embodiment, the braking effect generated together by the translational Entlangreiben and here additionally rotational entrainment, at least by a factor of 1.5 to 10, preferably at least by a factor 2 to 6 , greater than the background friction and drive motor-related braking effect.

The at least one friction element 14 , Here and preferably the only friction element 14 , Is to achieve the braking effect radially with the surface, here the inner surface, the other component in contact. The other component in the exemplary embodiments described here by way of example and explained in more detail below is a tube, namely the spindle guide tube 9 , the torsion tube 10 or the drive tube 11a , The friction element 14 is here and preferably in order to achieve the braking effect radially in contact with the tube inside the respective tube.

In the case that the component to which the friction element 14 along the spindle guide tube 9 is, according to a preferred variant with the friction device 13 provided component the spindle 6a , This variant is described below with reference to various embodiments in the 3 to 5 explained.

Basically, however, the variant is conceivable that the torsion tube 10 that component is where the friction element 14 along which, in this case, with the friction device 13 provided component the spindle guide tube 9 or the spindle nut 6b is. Also, both the spindle guide tube 9 as well as the spindle nut 6b a friction device 13 exhibit.

According to the variant in which the drive tube 11 a of the housing 11 that component is where the friction element 14 that is in the drive tube 11a axially movably guided output tube 11b the with the friction device 13 provided component.

In principle, combinations of the variants described above can also be provided. Also, the function of each of the brake assembly 12 relatively braked components within the brake assembly 12 be reversed, that is, for example, the spindle guide tube 9 with the friction device 13 , then inside, be provided with the spindle 6a then the component is where the friction element 14 along rubs. The same applies to the component pair that comes from the torsion tube 10 on the one hand and the spindle guide tube 9 and / or the spindle nut 6b on the other hand is formed. Finally, this also applies to the component pair that comes from the drive tube 11a and the output tube 11b is formed. Common to all variants is that the component to which the friction element 14 along the contact area of the friction element 14 has no thread and in particular not the spindle 6a is.

Although the exemplary embodiments described below all relate to the variant in which the friction device 13 at the spindle 6a is arranged and the friction element 14 on the surface of the spindle guide tube 9 along rubs. However, the relevant explanations also apply accordingly to other pairs of components, in particular all other variants mentioned above.

In 3a) has the friction device 13 next to the friction element 14 also a sleeve-shaped element 15 on, which consists in particular of plastic and on an end portion of the spindle 6a is attached. The sleeve-shaped element 15 serves as the basis for the friction element 14 that here and preferably one or more rings 16 , here for example exactly three rings 16 , having. The friction element 14 , here for example the rings 16 , Is or are mounted with a resilient bias (radial interference), the normal force and thus a frictional force on the surface of the other component, here the spindle guide tube 9 , generated. In this way, constantly, ie with an adjustment in each adjustment, an increased base friction in the spindle drive 1 generated.

The material of the friction element 14 , here the rings 16 , is in particular a thermoplastic or elastomeric plastic, preferably PU, PUR, EPDM, POM, whereby a particularly good friction effect can be achieved.

In the embodiment in 3a is the sleeve-shaped element 15 that is the basis for the friction element 14 forms, rotatably with the spindle 6a connected. The embodiment in 3b) has the same construction as in 3a) but here is the sleeve-shaped element 15 relative to the spindle 6a is rotatable and thus by the rotational movement of the spindle 6a is decoupled.

The embodiment in 3c ) differs from the embodiments in the 3a) and b) in that the friction element 14 and thus the braking effect is adjustable. The friction element 14 , here are the rings 16 , is or will be by means of a set screw 24 in the axial direction X more or less compressed, whereby the radial excess and corresponding to the contact pressure can be changed.

In the embodiment in 3d ) generates the brake assembly 12 a path-dependent braking effect, wherein the braking effect in the axial direction in an axial portion of the brake assembly 12 here and preferably continuously changes. This is achieved here in that the diameter, in particular inner diameter, of the component on which the respective friction element 14 rubbing, here so the spindle guide tube 9 , tapered from a larger diameter to a smaller diameter. Thus, here follows an axial section with a constant larger diameter, an axial section with a continuous here taper, followed in turn by an axial section with a constant smaller diameter. In the larger diameter portion, either no braking action at all or only a small braking effect is generated, whereas in the smaller diameter portion a greater braking effect is produced.

The embodiments in the 4a) to d ) differ from the embodiments in the 3a) to d ) in that here as a friction element 14 no rings are provided. According to 4a), the friction element 14 of a plurality of radially biased circumferential segments 17 educated. The perimeter segments 17 are here and preferably with the sleeve-shaped element 15 each with one or more springs 18 connected to the circumferential segments 17 Press radially outward.

In the embodiment in 4b) is the friction element 14 formed integrally, wherein from a central portion Umfangsssegemente 17 extend to the outside. The friction element 14 is therefore not the entire scope of the other component, but only in sections.

In the embodiment in 4c ) is the sleeve-shaped element 15 a stop nut 19 attached to one end portion of the friction device 13 provided component, here the spindle 6a , is mounted. The friction element 14 is here radially on the stop nut 19 put on, with here and preferably the stop nut 19 together with the friction element 14 , here as a sleeve 20 is formed, a preassembled unit 21 forms.

In 4d ) is the friction device 13 only a single friction element 14 in the form of a sleeve 20 , wherein the friction device 13 on both sides axially to one stop nut 19 adjacent, thus the friction element 14 hold axially.

In the 5a) to d ) Embodiments are shown in which the brake assembly 13 produces a varying braking effect. In the embodiments in the 5a) and b) a direction-dependent braking effect is generated, which is preferably in a first adjustment direction of the spindle drive 1 in particular, an opening of the closure element 3 corresponds, is smaller than in a second, opposite adjustment of the spindle drive 1 in particular closing the closure element 3 equivalent. In the embodiment in 5a) has the friction device 13 a construction in which the friction element 14 at the said adjusting movement between the components in each adjustment direction increases the braking effect path-dependent. All embodiments of the 5a) to d ) have in common that the diameter, in particular outer diameter, and / or the radial contact pressure of the friction device 13 , especially the friction element 14 , changes after a change of the adjustment, in the embodiments in the 5a) to c ) for the entire duration of the adjustment in the respective adjustment direction, in the embodiment in 5d ) only temporarily.

In the embodiment in 5a) the outer diameter of the sleeve-shaped element changes 15 in one direction, which is here and preferably a conical extension. The friction element 14 also has rings here 16 on, which here and preferably have different inner diameters. By a wedge effect a directional braking effect is achieved here.

In the embodiment in 5b) is on a sleeve-shaped element 15 as it is based on 5a) has been described, a friction element 14 in the form of a sleeve 20 placed, the inner diameter decreases toward one end, conically reduced here. The inner contour of the friction element 14 corresponds at least substantially, in particular completely, the outer contour of the sleeve-shaped element 15 , Again, a wedge effect is achieved in one direction, which increases the braking effect in this direction, whereas in the opposite direction, the friction element 14 on the sleeve-shaped element 15 is loosened, causing the friction element 14 generates a lower contact force. In this direction, the braking effect is lower. An axial fuse 22 prevents the friction element 14 axially completely detached from the sleeve-shaped element.

In the embodiment in 5c ) is a wrap 23 as a friction element 14 intended. This also allows the generation of a directional braking effect.

In the embodiment in 5d ) is finally the sleeve-shaped element 15 tapered in the axial direction towards the center, wherein in this area the friction element 14 in the form of a sleeve 20 is arranged.

According to another teaching is a closure element arrangement 2 of a motor vehicle 4 claimed, which one with the body of the motor vehicle 4 adjustable coupled closure element 3 and at least one spindle drive 1 having the type described above. Preferably, two spindle drives 1 of the type described above, which are each on one side of the closure element 3 are arranged.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The 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

• DE 102014114617 A1 [0003]

Claims (15)

Spindle drive for a closure element (3) of a motor vehicle (4), wherein a drive unit (5) and the drive unit (5) downstream drive, a spindle (6a) and spindle nut (6b) having spindle spindle nut transmission (6) with in axial direction (X) extending geometric spindle axis (A) for generating linear drive movements between a spindle-side drive connection (8a) and a spindle nut side drive connection (8b) is provided, wherein the spindle drive (1) has a brake assembly (12), wherein the brake assembly (12 ) counteracts the displacement of at least two components of the spindle drive (1) relative to each other, which move axially relative to each other according to the linear drive movements, characterized in that the braking action of the brake assembly (12) is generated directly between the two components of the spindle drive (1), that one of the two axially movable components a Reibeinr has seal (13) with at least one friction element (14) and that the friction element (14) translates when adjusting on another of the two axially movable components and thereby generates a braking action parallel to the spindle axis (A). Spindle drive to Claim 1 , characterized in that the at least one friction element (14) in the adjustment on the respective other of the two axially movable components in addition rotates along and thereby generates a braking action about the spindle axis (A) around. Spindle drive to Claim 1 or 2 , characterized in that the at least one friction element (14) to achieve the braking effect in radial contact with the surface of the respective other component, in particular with the inner surface of the respective other component in contact. Spindle drive according to one of the preceding claims, characterized in that the respective other component on which the at least one friction element (14) rubs along, is a tube, preferably that the at least one friction element (14) to achieve the braking effect radially with the tube inside of the Tube is in contact. Spindle drive according to one of the preceding claims, characterized in that the respective other component on which the at least one friction element (14) along drives, a spindle guide tube (9) which is rotatably connected to the spindle nut (6b) and connected to the spindle nut side drive connection (8b), preferably that the component provided with the friction device (13) is the spindle (6a). Spindle drive according to one of the preceding claims, characterized in that the respective other component, on which the at least one friction element (14) along drives, a torsion tube (10), in which the spindle nut (6b) and / or the spindle guide tube (9) axially movable and rotatably guided and which is coupled to the spindle-side drive connection (8a), preferably, that the component provided with the friction device (13) is the spindle guide tube (9) or the spindle nut (6b). Spindle drive according to one of the preceding claims, characterized in that the respective other component, on which drives the at least one friction element (14), a drive tube (11a) which is coupled to the spindle-side drive connection (8a) and axially movable together with one therein guided output tube (11b) which is coupled to the spindle nut side drive connection (8b), a telescopic housing (11) of the spindle drive (1) forms, preferably, that with the friction device (13) provided component is the output tube (11b). Spindle drive according to one of the preceding claims, characterized in that the brake assembly (12) generates a path-dependent braking action, preferably that the braking action in the axial direction (X) in an axial portion of the brake assembly (12), in particular continuously changes, more preferably, in that the diameter, in particular inner diameter, of the respective other component on which the at least one friction element (14) rubs, changes in an axial section of the component in the axial direction (X), in particular continuously. Spindle drive according to one of the preceding claims, characterized in that the brake assembly (12) generates a direction-dependent braking action, preferably, that the braking effect in a first adjustment of the spindle drive (1), which corresponds in particular to an opening of the closure element (3) is smaller than in a second adjustment direction of the spindle drive (1), which corresponds in particular to closing of the closure element (3), more preferably that the diameter, in particular outer diameter, and / or the radial contact pressure of the friction device (13), in particular of the friction element (14) , changes after changing the adjustment direction. Spindle drive according to one of the preceding claims, characterized in that the braking effect is adjustable. Spindle drive according to one of the preceding claims, characterized in that the friction element (14) one or more rings (16) and / or one or more sleeves (20) and / or one or more peripheral segments (17) and / or one or more wrap springs (23). Spindle drive according to one of the preceding claims, characterized in that the friction element (14) bears radially on the surface of the friction device (13) provided component, in particular runs around the radial outer side of the component, or that the friction element (14) radially a sleeve-shaped element (15) of the friction device (13) rests, in particular around the radial outer side of the sleeve-shaped element (15), wherein the sleeve-shaped element (15) with the friction device (13) provided component rotatably or rotatably connected, preferably in that the sleeve-shaped element (15) is a stop nut (19) mounted on an end portion of the component provided with the friction device (13). Spindle drive according to one of the preceding claims, characterized in that the diameter, in particular outer diameter, of the sleeve-shaped element (15) and / or the axial portion of the friction device (13) provided component in which the friction element (14) on the component is mounted in the axial direction (X) changes, in particular in the axial direction (X) to an axial end and possibly also in the opposite axial direction to the opposite axial end expands, in particular flared, and / or that the Diameter particular inner diameter of the friction element (14) changes in the axial direction, in particular in the axial direction towards one axial end and possibly also in the opposite axial direction (X) towards the opposite axial end decreases, in particular conically reduced, preferably that the diameter, in particular outer diameter, of the sleeve-shaped The element (15) and / or the axial section of the component provided with the friction device (13), in which the friction element (14) is mounted on the component, expands in the axial direction (X) opposite to the axial direction into which the diameter, in particular inner diameter, of the friction element (14) decreases. Spindle drive according to one of the preceding claims, characterized in that the friction device (13) on one or both sides axially adjacent to one stop nut (19) or the friction element (14) is arranged radially on a stop nut (19), which stop nut (19) is mounted in each case at one end portion of the component provided with the friction device (13), preferably that the stop nut (19) or at least one of the stop nuts (19) together with the friction device (13) and / or the friction element (14) is a preassembled unit (21) forms. Closure element arrangement of a motor vehicle (4) with a closure element (3) and a closure element (3) associated with the spindle drive (1) according to one of the preceding claims.

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