DE102019128830A1 - Drive for adjusting an adjusting element of a motor vehicle - Google Patents

Abstract

The invention relates to a drive for adjusting an adjusting element (2) of a motor vehicle (3), the drive (1) having a drive unit (4) which, as components transmitting drive force, comprises a hollow cylinder (5) and a rod (6) axially guided therein ), the drive (1) having two joint parts (8, 9) for transferring linear drive movements to the motor vehicle (3), each of which forms a drive connection (12, 13) with a counter-joint part (10, 11) on the motor vehicle, wherein one joint part (8) is axially fixedly coupled to a first one of the components (5, 6) and the other joint part (9) is coupled to a second one of the components (5, 6) in the assembled state, and the drive (1) has a drive spring arrangement (14) with at least one drive spring (15) which acts on the two joint parts (8, 9). It is proposed that in the assembled state at least one of the components (5, 6) of the drive unit (4), in particular both components (5, 6) of the drive unit (4), and the associated joint part (8, 9) via a form-fit element (16) are coupled to one another in an axially form-fitting manner, in particular in a form-fitting manner in both axial directions, and the form-fitting element (16) protrudes radially into an axial projection (P) of the spring material of the drive spring arrangement (14).

Description

The invention relates to a drive for adjusting an adjusting element, in particular a flap, of a motor vehicle according to the preamble of claim 1.

The term “adjusting element” is to be understood broadly in the present case. It includes, for example, flaps such as tailgates, trunk lids, engine hoods, side doors, cargo space flaps or the like, or sliding doors of a motor vehicle.

Different types of drive are known for adjusting such an adjusting element, for example a tailgate. Motor-driven and motor-less and, in particular, spring-driven drives are known. A motor-driven drive is, for example, a spindle drive which, via a drive motor, drives a spindle-spindle nut gear as a feed gear for generating linear drive movements. A motorless drive has in particular a gas pressure spring which has a drive unit with a gas-filled gas pressure spring cylinder and a gas pressure spring piston rod axially guided therein, that is to say a push rod with a piston at the end. The gas filled into the cylinder is then pressurized and thus provides the spring force. This drive unit can additionally be supported by a drive spring arrangement with at least one drive spring, in particular a helical spring, for example a helical compression spring, which provides an additional spring force.

The well-known drive ( DE 10 2008 061 117 A1 ), from which the invention is based, has such a drive unit in the form of a gas pressure spring. The drive unit is surrounded radially by a drive spring arrangement with a drive spring in the form of a helical compression spring. The drive has two joint parts that can be adjusted relative to one another along a geometric drive axis between a retracted position and an extended position, each of which, with a counter-joint part on the motor vehicle side, forms a drive connection for coupling to the adjusting element on the one hand and the motor vehicle on the other . One joint part is axially fixedly coupled to a hollow cylinder of the drive unit, namely the gas pressure spring cylinder, and the other joint part with a rod of the drive unit, namely the rod provided with the gas pressure spring piston. A metal plate is provided between the respective joint part and the drive unit, on which the drive spring of the drive spring arrangement is axially supported in order to transmit the spring force to the joint parts.

The drive housing, which is made of a plastic material, is angled inwards at the two axial ends and thus forms a base which secures the respective metal plate towards the joint part against the spring force of the drive spring arrangement. The two joint parts themselves, which are each coupled to the associated component of the gas pressure spring, i.e. the gas pressure spring cylinder on the one hand and the gas spring piston rod on the other hand, form a further axial safeguard when mounted on the motor vehicle. However, it is problematic that if the housing and the joint parts are destroyed, for example in the event of a fire, there is a risk of undesired expansion of the drive spring of the drive spring arrangement, since the two metal plates then possibly no longer have any or at least no sufficient axial support.

It is also known to provide for the axial support of a drive spring of a drive spring arrangement metal bodies which are each crimped to the components of the drive unit that transmit the drive force, i.e. the hollow cylinder and the rod axially guided therein, in order to axially secure the metal body on the drive unit and thereby achieve a to prevent unwanted expansion of the drive spring. These metal bodies are then usually overmolded with plastic material to form the associated joint part. A corresponding drive has a relatively complex structure and has a large number of parts.

The invention is based on the problem of designing and developing the known drive in such a way that a high level of operational reliability is ensured with a simple structure at the same time.

The above problem is solved in a drive for adjusting an adjusting element, in particular a flap, of a motor vehicle according to the preamble of claim 1 by the features of the characterizing part of claim 1.

What is essential is the fundamental consideration of axially securing the respective joint part on the associated component of the drive unit that transmits a drive force via a form-fit element that protrudes into the imaginary extension of the spring material, i.e. the spring wire forming the spring coils, the drive spring arrangement, in particular the axially closest drive spring . The term “axial” refers to the direction of the spring center line or the geometric drive axis. The imaginary extension, hereinafter “projection”, of the spring material runs here and preferably in a ring around the geometric drive axis. On the one hand, a particularly simple assembly is ensured in this way, since the respective joint part and the associated Components of the drive unit only have to be brought together, in particular plugged together, and have to be coupled to one another by introducing said form-fitting element. Since the interlocking element for axially coupling the respective joint part with the associated component of the drive unit is also axially interlocking with the respective component, the interlocking element also forms an axial securing of the drive spring arrangement or drive spring in the event of a fire if a suitable material is selected. in particular if the form-locking element, which will be explained in more detail below, is made of metal or another heat-resistant material, it remains securely connected to the respective component of the drive unit, which is in particular made of metal, even in the event of a fire, thus preventing an unwanted Expansion of the respective mainspring.

In detail, it is proposed that, in the assembled state, at least one of the components of the drive unit, in particular both components of the drive unit, and the respectively assigned joint part are axially positively connected to one another via a form-fitting element, in particular form-fittingly in both axial directions, and the form-fitting element is coupled radially into one axial projection of the spring material of the drive spring assembly protrudes. The radial extension of the form-fit element, i.e. the extension orthogonal to the course of the geometric drive axis, is so large and / or the form-fit element is mounted in such a way that the imaginary extension of the drive spring arrangement and in particular the axially closest drive spring of the drive spring arrangement meets the form-fit element in the assembled state . The radial extent of the form-fit element is preferably greater than the inner diameter of the drive spring arrangement and / or the drive spring axially closest to the form-fit element.

According to the particularly preferred embodiment according to claim 2, the form-fitting element is a snap ring-like clip. “Like a snap ring” here means that the clip generally fulfills the function of a snap ring, but does not have to be bent as a ring like a snap ring. Rather, the clip has two legs which, like the ends of a snap ring, can generate a clamping force on one another when they are pressed apart from the unloaded state.

Claim 3 relates to an axial extension which is provided on the hollow cylinder forming one component of the drive unit and which serves to hold the form-fitting element, in particular the clamp, in an axially form-fitting manner in the assembled state.

Claims 4 to 6 define a plug connection as a particularly preferred connection between the respective component of the drive unit and the associated joint part. This plug connection is then secured in an axially form-fitting manner by the form-fitting element in the assembled state.

According to the also preferred embodiment according to claim 7, the drive has a drive housing with two housing tubes, in particular a housing inner tube and a housing outer tube, which telescope into one another when adjusted between the retracted position and the extended position. Each housing tube is preferably assigned to one of the joint parts and is axially fixed for this purpose.

Claims 8 to 12 relate to particularly preferred options for the arrangement of the drive spring arrangement relative to the drive housing and the interaction of the drive spring arrangement with the drive housing.

Claim 13 relates to the material that can be used particularly preferably for the components of the drive.

Particularly preferred configurations of the drive unit of the drive are specified in claim 14. Thus, the drive unit is preferably designed as a gas pressure spring with a gas pressure spring cylinder and a gas pressure spring piston rod axially guided therein, thus preferably purely spring-driven. According to another, likewise preferred embodiment, the drive unit can also be a spindle drive unit which has a spindle nut tube with a spindle nut that is axially fixed and rotationally fixed and a threaded spindle meshing with the spindle nut. Such a spindle-spindle nut drive can then be motor-driven via an optionally available drive motor, which is then also part of the drive unit.

According to the further preferred embodiment according to claim 15, the two joint parts, the hollow cylinder-side joint part on the one hand and the rod-side joint part on the other hand, are structurally identical to further simplify assembly.

• 1 in einer schematischen Perspektivansicht das Heck eines Kraftfahrzeugs mit einem vorschlagsgemäßen Antrieb,
• 2 in einer Schnittansicht den vorschlagsgemäßen Antrieb gemäß 1 a) in einer eingefahrenen Stellung und b) in einer ausgefahrenen Stellung und
• 3 in einer vergrößerten perspektivischen Ansicht ein Detail des vorschlagsgemäßen Antriebs gemäß 1 a) gemäß einem ersten Ausführungsbeispiel und b) gemäß einem zweiten Ausführungsbeispiel.

The invention is explained in more detail below with the aid of a drawing which merely shows exemplary embodiments. In the drawing shows:

• 1 in a schematic perspective view the rear of a motor vehicle with a proposed drive,
• 2 in a sectional view of the proposed drive according to 1 a) in a retracted position and b) in an extended position and
• 3 in an enlarged perspective view a detail of the proposed drive according to FIG 1 a) according to a first embodiment and b) according to a second embodiment.

The drive shown in the drawing 1 , which is designed here as a linear drive, is designed here and preferably in a manner to be explained as a gas pressure spring drive. Basically, the drive can 1 but also be designed as a spindle drive. The statements on a gas pressure spring drive apply equally to a spindle drive.

The proposed drive 1 , which is designed here as a gas pressure spring drive, is used here for the motorless and purely spring-driven adjustment of an adjusting element 2 , in particular a flap, of a motor vehicle 3 . With the adjustment element 2 is it according to 1 around a tailgate of the motor vehicle 3 . With regard to other configurations of the adjusting element 2 reference is made to the list in the introductory part of the description.

The drive 1 has a drive unit 4th on, the components transmitting a driving force a hollow cylinder 5 and a rod axially guided therein 6th having. The hollow cylinder 5 and the pole 6th are, here, among other things, via one in the hollow cylinder 5 filled gas, biased against each other, here and preferably in the extended position.

For transferring linear drive movements to the motor vehicle 3 indicates the drive 1 two to each other along the geometric drive axis 7th joint parts adjustable between a retracted position and an extended position 8th , 9 on, which are here and preferably identical. This in 2 upper joint part 8th forms together with a counter-articulation part on the motor vehicle side 10 , the one here on the adjustment element 2 is arranged, a drive connection 12th for coupling with the adjustment element 2 . This in 2 lower joint part 9 forms together with a counter-articulation part on the motor vehicle side 11 , which is arranged here on the motor vehicle body, a drive connection 13th for coupling with the motor vehicle 3 Furthermore. Here and preferably have the two joint parts 8th , 9 each has a ball socket, which with a ball head of the respective counter-joint part 10 , 11 are articulated. In principle, it is also conceivable that the joint parts 8th , 9 a ball head and the mating joint part 10 , 11 has a ball socket.

Like the enlarged detailed views in 2 show, this is a joint part 8th with an associated first of the components 5 , 6th the drive unit 4th , here the hollow cylinder 5 , and the other joint part 9 with an associated second of the components 5 , 6th the drive unit 4th , here the rod 6th , each axially coupled in the assembled state. The axially fixed coupling is explained in more detail below.

The proposed drive also has 1 a drive spring assembly 14th with at least one drive spring 15th , here exactly one mainspring 15th , on that on the two joint parts 8th , 9 acts, so it is biased. By the drive spring assembly 14th and that in the hollow cylinder 5 filled gas are the joint parts 8th , 9 against each other, here in the extended position, biased. The at least one drive spring 15th , here the exactly one mainspring 15th , is in particular a helical spring and here and preferably a helical compression spring. In principle, according to an embodiment not shown here, it is also conceivable, in addition or as an alternative to a helical compression spring, to use a helical tension spring as part of the drive spring arrangement 14th to be provided.

It is now essential that at least one of the components in the assembled state 5 , 6th the drive unit 4th , especially both components 5 , 6th the drive unit 4th , and the associated joint part 8th , 9 via a form-fit element 16 are coupled to one another in an axially form-fitting manner, in particular in a form-fitting manner in both axial directions, and the form-fitting element 16 radially into an axial projection P of the spring material of the drive spring arrangement 14th protrudes.

When the "assembled state" is mentioned here and in the following, the assembled state of the drive is always meant. In this state, there is an axial form fit between the respective joint part 8th , 9 and the associated component 5 , 6th in both directions, that is, along the geometric drive axis 7th both in the direction of the retracted position and in the direction of the extended position.

The form-fit element 16 is here and preferably, as in 2 bottom left and in 3a) and b) shown below is a snap-ring type clip 17th who have favourited Two Legs 17a , 17b has, between which, at least in the assembled and here also in the unassembled state, an intermediate space is formed. The two legs 17a , 17b are therefore spaced from each other.

The shape of the legs can be as in 2 bottom left and in 3a) shown below, be designed so that the space is a bottleneck 18th has on which the bracket 17th in the assembled state axially form-fitting with the respective component 5 , 6th the drive unit 4th or the respective joint part 8th , 9 connected is. This bracket 17th is here and preferably essentially Ω-shaped.

3b) shows another embodiment of a bracket below 17th , whose thighs 17a , 17b are shaped so that the space between them is an enlarged body 19th has on which the bracket 17th in the assembled state axially form-fitting with the respective component 5 , 6th the drive unit 4th or the respective joint part 8th , 9 connected is. Here the legs point 17a , 17b an essentially straight course on its inside, at said point 19th deviates from the straight course and the gap is increased.

The clip 17th is here and preferably in one or more grooves 20th kept that in the respective component 5 , 6th or an axial extension described below 21 are provided. According to the embodiment in 3a) are two side grooves 20th provided with a groove base that is curved here and preferably. According to the embodiment in 3b) is a circumferential groove 20th intended.

3a) and b) further show that the bracket 17th by the way, so the one not with the groove 20th cooperating part of the bracket 17th , in the assembled state axially form-fitting with the respective joint part 8th , 9 connected is.

In an embodiment not shown here, it can also be provided that the respective bracket 17th at the bottleneck 18th or the extended position 19th in the assembled state with the respective joint part 8th , 9 is axially positively connected and otherwise with the respective component 5 , 6th the drive unit 4th is axially positively connected.

In the exemplary embodiments shown here, it is now the case in detail that in the area of the in 2 upper part of the joint 8th a bracket 17th about their bottleneck 18th ( 3a) ) or via their extended position 19th ( 3b) ) axially form-fitting with the hollow cylinder 5 is connected, namely via said axial extension 21 on the hollow cylinder 5 . Incidentally, this bracket is 17th axially form-fitting with the joint part 8th connected, namely via a connection section to be described below 8b of the joint part 8th . It is also the case here that in the area of the in 2 lower joint part 9 another bracket 17th also about their bottleneck 18th or via their extended position 19th axially form-fitting with the rod 6th connected is. Incidentally, this bracket is also 17th axially form-fitting with the joint part 9 connected via a connection section 9b of the joint part 9 .

It should be noted that the previously described bracket 17th a particularly preferred embodiment of a form-fitting element 16 is for the stated purpose. In principle, the form-fit element 16 but also be designed in other ways, for example in the shape of a pin.

As already indicated above, the hollow cylinder is here and preferably 5 , namely on its joint part associated with or coupled to it 8th facing axial end, with an axial extension 21 provided that to the hollow cylinder 5 is axially fixed. The form-fit element 16 is, as I said, in the assembled state with this axial extension 21 and thus also with the hollow cylinder 5 axially positively connected. Here and preferably is the axial extension 21 with the hollow cylinder 5 firmly connected, in particular to the hollow cylinder 5 welded on at the end. Additionally or alternatively, however, it is also conceivable that the extension 21 with the hollow cylinder 5 is positively and / or positively connected or with the hollow cylinder 5 is designed in one piece. Such an axial extension 21 in particular has the same cross-sectional shape as the axial end portion 6a the pole 6th over which the pole 6th with the associated joint part 9 by means of the respective form-fit element 16 or the respective bracket 17th is axially coupled positively. In this way, joint parts of the same construction can be used to simplify assembly 8th , 9 can be used.

As the 2 and 3 also show is here and preferably the respective component 5 , 6th the drive unit 4th , so the hollow cylinder 5 one hand and the rod 6th on the other hand, with the respectively assigned joint part 8th , 9 via a plug connection 22nd coupled. The connector 22nd is through the form-fit element 16 axially secured with positive locking, so it can be with the mounted positive locking element 16 cannot be resolved.

The respective joint part 8th , 9 has here and preferably a bearing section 8a , 9a for coupling with the counter joint part 10 , 11 , here and preferably a ball socket, as well as a connection section spaced therefrom 8b , 9b for coupling with the respectively assigned component 5 , 6th the drive unit 4th on. The warehouse section 8a , 9a is with the connector section 8b , 9b via a connection section 8c , 9c connected. Storage sections are particularly preferred 8a , 9a and connecting section 8c , 9c , preferably also together with the connection section 8b , 9b , designed as a one-piece component. The connection section 8b , 9b is here and preferably with that of the joint part 8th , 9 respectively assigned component 5 , 6th the drive unit 4th via the plug connection 22nd coupled. On the hollow cylinder side, this takes place via said axial extension 21 , on the rod side over the end section 6a the pole 6th . When the form-fit element 16 , here the bracket 17th , with the respective joint part 8th , 9 is connected as intended, is here and preferably the respective bearing section 8a , 9a axially from the form-fit element 16 or from the bracket 17th spaced.

The connector described 22nd can be designed in various ways. So here and preferably is the axial extension 21 and / or the joint part associated with or coupled to it 9 facing axial end section 6a the pole 6th in the respective connection section 8b , 9b inserted axially. Alternatively, it can also be provided that the extension 21 or axial end section 6a on the connection section 8b , 9b is attached.

Further shows how in particular the 2a) and b) illustrate the drive 1 a drive housing 23 with two housing tubes 24 , 25th , here a housing inner tube 24 and a housing outer tube 25th which telescope into one another during an adjustment between the retracted position and the extended position. The two casing tubes 24 , 25th are here and preferably to one of the joint parts assigned in each case 8th , 9 axially fixed. Here is the case inner tube 24 to the in 2 lower joint part 9 and the housing outer tube 25th to the in 2 upper joint part 8th axially fixed.

The mainspring assembly 14th here from a single mainspring 15th is formed, but also by several drive springs 15th can be formed, is here and preferably radially between the drive unit 4th and the drive housing 23 arranged. It is used to guide the at least one and here only drive spring 15th a spring guide tube 26th radially between the drive unit 4th and the drive spring assembly 14th arranged.

The axially fixed connection between the respective housing tube 24 , 25th and the associated joint part 8th , 9 takes place by an axial form fit, such that a housing flange 27 between an axial stop 28 of the joint part 8th , 9 and the drive spring assembly 14th is axially fixed. So here and preferably the respective housing tube 24 , 25th , in particular at an axial end portion 24a , 25a , said housing flange 27 on, which protrudes here in particular radially inward. The housing flange 27 comes to the associated joint part in the assembled state 8th , 9 towards the joint part 8th , 9 axial to the system. In the assembled state, at least one and here exactly one drive spring is supported 15th the drive spring assembly 14th axially to the housing flange 27 and clamps the housing flange 27 thereby against said axial stop 28 of the joint part 8th , 9 in front.

The axial stop 28 of the joint part 8th , 9 is here and preferably by a securing flange 29 of the respective joint part 8th , 9 , which in particular protrudes radially outward, is formed. In the embodiment in 2 and 3a) is the locking flange 29 a separate component. Here is the locking flange 29 with the joint part 8th , 9 otherwise radially and axially positively connected. The radial form fit results from the fact that the securing flange 29 is an annular member that axially onto the connecting portion 8b , 9b of the joint part 8th , 9 is attached. The axial form fit is achieved by the mounted form fit element 16 generated. Additionally or alternatively, between the securing flange 29 and the joint part 8th , 9 Incidentally, there is also a cohesive and / or non-positive connection. It is also conceivable that the securing flange 29 with the joint part 8th , 9 is otherwise designed in one piece, as is the case with the exemplary embodiment in FIG 3b) is provided.

In the embodiment in 2 and 3a) connects the form-fit element 16 the locking flange 29 of the respective joint part 8th , 9 , which, as I said, is a separate component here, axially form-fitting with the joint part 8th , 9 Furthermore. In addition or as an alternative, it is provided that the form-fit element 16 the locking flange 29 axially form-fitting with the assigned component 5 , 6th , so the hollow cylinder 5 or the rod 6th , and / or as here with the extension 21 connects.

In 3 it is also provided in both exemplary embodiments that the respective housing tube 24 , 25th in the assembled state axially over the respective form-fit element 16 extends beyond and / or the respective form-fitting element 16 surrounds radially. The form-fit element 16 is secured radially in this way and is not easily accessible from the outside. For dismantling, but also for assembly, it is provided here and preferably that the respective housing tube 24 , 25th against the spring force of the drive spring assembly 14th can be moved into a position in which the respective form-locking element 16 radially from the housing tube 24 , 25th is released. “Approved” means that the respective form-fit element 16 then no longer radially in front of the housing tube 24 , 25th is surrounded.

Here and preferably it is also the case that the respective form-locking element 16 and / or the at least one drive spring 15th the drive spring assembly 14th and / or the respective component 5 , 6th , so the hollow cylinder 5 or the rod 6th , and / or the axial extension 21 each made of metal is designed. In addition or as an alternative, it is provided here that the respective joint part 8th , 9 and / or the respective housing tube 24 , 25th is designed from a plastic material.

As has already been mentioned before, here and preferably is the drive 1 designed as a gas spring drive. So here and preferably is the drive unit 4th as a gas spring 30th configured, the first component 5 a gas-filled gas spring cylinder 31 and the second component 6th a gas pressure spring piston rod axially guided therein 32 is. A gas spring piston rod 32 is a unit made of a push rod 32a and piston 32b . Here and preferably is radially inside the gas spring cylinder 31 at least one helical compression spring 33 arranged, which is compressed in the retracted position and preferably load-free in the extended position. This helical compression spring 33 is not part of the above drive spring assembly 14th , but serves only to support the adjustment movement temporarily at the beginning of an adjustment from the retracted to the extended position.

As was also indicated previously, the propulsion according to the proposal is 1 not limited to the design as a gas pressure spring drive, but can also be designed as a spindle drive. In this case it is the drive unit 4th designed as a spindle drive unit, the first component 5 a spindle nut tube with a spindle nut that is axially fixed and rotationally fixed and the second component 6th is a threaded spindle meshing with the spindle nut. Such a spindle-spindle nut drive is well known and does not need any explanation here. An optional drive motor for the drive unit 4th can then operate the spindle-spindle nut gear in the usual way.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was 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.

Patent literature cited

• DE 102008061117 A1 [0004]

Claims (15)

Drive for adjusting an adjusting element (2), in particular a flap, of a motor vehicle (3), the drive (1) having a drive unit (4) which, as a drive force-transmitting component, has a hollow cylinder (5) and a rod (5) axially guided therein. 6), wherein the drive (1) for transferring linear drive movements to the motor vehicle (3) has two joint parts (8, 9) which can be adjusted relative to one another along a geometric drive axis (7) between a retracted position and an extended position, each with a motor vehicle-side counter-articulated part (10, 11) form a drive connection (12, 13) for coupling to the adjusting element (2) on the one hand and the motor vehicle (3) on the other hand, wherein the one articulated part (8) with an associated first of the components (5 , 6) of the drive unit (4), in particular the hollow cylinder (5), and the other joint part (9) with an associated second of the components (5, 6) of A. The drive unit (4), in particular the rod (6), is coupled axially fixed in each case in the assembled state, and the drive (1) has a drive spring arrangement (14) with at least one drive spring (15) which acts on the two joint parts (8, 9 ), characterized in that in the assembled state at least one of the components (5, 6) of the drive unit (4), in particular both components (5, 6) of the drive unit (4), and the respectively assigned joint part (8, 9) a form-fit element (16) are axially positively coupled to one another, in particular positively in both axial directions, and the form-fit element (16) protrudes radially into an axial projection (P) of the spring material of the drive spring arrangement (14). Drive after Claim 1 , characterized in that the form-fit element (16) is a snap ring-like clip (17) which has two legs (17a, 17b) between which, at least in the assembled state, an intermediate space is formed, preferably that the intermediate space is a narrow point (18 ) or an extended point (19) at which the clamp (17) in the assembled state is axially positively connected to the respective component (5, 6) of the drive unit (4), the clamp (17) otherwise in the assembled state in particular is axially positively connected to the respective joint part (8, 9), or that the space has a narrow point (18) or an enlarged point (19) at which the clamp (17) in the assembled state axially form-fitting with the respective joint part (8, 9) is connected, the clip (17), moreover, in the assembled state, in particular axially positively connected to the respective component (5, 6) of the drive unit (4). Drive after Claim 1 or 2 , characterized in that the hollow cylinder (5) is provided at its axial end facing the associated joint part (8) with an axial extension (21) which is axially fixed to the hollow cylinder (5), and that the form-locking element (16) is mounted State is axially positively connected to the axial extension (21), preferably that the axial extension (21) is integrally, positively and / or non-positively connected to the hollow cylinder (5) or designed in one piece with the hollow cylinder (5). Drive according to one of the preceding claims, characterized in that the respective component (5, 6) of the drive unit (4) is coupled to the respectively assigned joint part (8, 9) via a plug connection (22) and the plug connection (22) through the Form-fitting element (16) is axially secured in a form-fitting manner. Drive according to one of the preceding claims, characterized in that the respective joint part (8, 9) has a bearing section (8a, 9a) for coupling to the counter-joint part (10, 11), in particular a ball socket or a ball head, and a connection section (8b, 9b) for coupling with the respectively assigned component (5, 6) of the drive unit (4) and a connecting section (8c, 9c) connecting the bearing section (8a, 9a) to the connecting section (8b, 9b), preferably that the connecting section (8b, 9b) is coupled to the component (5, 6) of the drive unit (4) assigned to the joint part (8, 9) via the plug connection (22). Drive according to one of the preceding claims, characterized in that the axial extension (21) and / or an axial end section (6a) of the rod (6) facing the associated joint part (9) is axially inserted or opened into the connection section (8b, 9b) the connection section (8b, 9b) is pushed on axially. Drive according to one of the preceding claims, characterized in that the drive (1) has a drive housing (23) with two housing tubes (24, 25) which, when adjusted between the retracted position and the extended position, extend telescopically into one another, preferably that the two housing tubes (24, 25) are axially fixed to a respectively assigned joint part (8, 9). Drive according to one of the preceding claims, characterized in that the drive spring arrangement (14) is arranged radially between the drive unit (4) and the drive housing (23), preferably that a spring guide tube (26) is arranged radially between the drive unit (4) and the drive spring arrangement (14) is arranged. Drive according to one of the preceding claims, characterized in that the respective housing tube (24, 25), in particular at an axial end section (24a, 25a), has a housing flange (27), which in particular protrudes radially inward, which in the assembled state comes to bear axially on the joint part (8, 9) towards the associated joint part (8, 9). Drive according to one of the preceding claims, characterized in that in the assembled state at least one drive spring (15) of the drive spring arrangement (14) is axially supported on the housing flange (27) and the housing flange (27) is supported against an axial stop (28) of the joint part ( 8, 9). Drive according to one of the preceding claims, characterized in that the axial stop (28) is formed by a securing flange (29) of the joint part (8, 9), which in particular protrudes radially outward, preferably that the securing flange (29) with the joint part (8, 9) is also cohesively, positively and / or non-positively connected or is otherwise designed in one piece with the joint part (8, 9), more preferably that the form-fitting element (16) axially form-fit with the securing flange (29) The joint part (8, 9) otherwise and / or connects to the associated component (5, 6) of the drive unit (4) and / or to the extension (21). Drive according to one of the preceding claims, characterized in that the respective housing tube (24, 25) in the assembled state extends axially beyond the respective form-fit element (16) and / or radially surrounds the respective form-fit element (16), preferably that for assembly and dismantling the respective housing tube (24, 25) can be displaced against the spring force of the drive spring arrangement (14) into a position in which the respective form-locking element (16) is released radially from the housing tube (24, 25). Drive according to one of the preceding claims, characterized in that the respective form-locking element (16) and / or the at least one drive spring (15) of the drive spring arrangement (14) and / or the respective component (5, 6) of the drive unit (4) and / or the extension (21) is made of metal, and / or that the respective joint part (8, 9) and / or the respective housing tube (24, 25) is made of a plastic material. Drive according to one of the preceding claims, characterized in that the drive unit (4) is designed as a gas pressure spring (30), the first component (5) being a gas-filled gas pressure spring cylinder (31) and the second component (6) a gas pressure spring axially guided therein Piston rod (32) is, preferably, that at least one helical compression spring (33) is arranged radially inside the gas pressure spring cylinder (31), which is compressed in the retracted position and preferably free of load in the extended position, or that the drive unit (4 ) is designed as a spindle drive unit, wherein the first component (5) is a spindle nut tube with a spindle nut that is axially fixed and rotationally fixed and the second component (6) is a threaded spindle that meshes with the spindle nut. Drive according to one of the preceding claims, characterized in that the two joint parts (8, 9) are structurally identical.

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