DE102012015650A1 - Drive arrangement for the adjustment of a flap of a motor vehicle - Google Patents

Abstract

The invention relates to a drive arrangement for adjusting a flap (1) of a motor vehicle between a closed position and an open position, a spring arrangement (2) with at least one spring element (2a, 2b) and a motor arrangement (3) with at least one drive motor (3a) and possibly a gear (3b) connected downstream of the drive motor (3a), the spring arrangement (2) and the motor arrangement (3) each being coupled to the flap (1) in terms of drive technology, the motor arrangement being used to adjust the flap (1) (3) works via a motor drive train (4) against the spring arrangement (2) on the flap (1) and wherein the motor drive train (4) has a flexible force transmission element (5) for transmitting drive movements. It is proposed that a compensating device (6) is connected in the motor drive train (4), which compensates for a movement introduced into the motor drive train (4) counter to the pulling direction (7) of the flexible force transmission element (5), in particular during a movement manual adjustment of the flap (1) in the closing direction, the flexible power transmission element (5) is especially spring-driven.

Description

The invention relates to a drive arrangement for the adjustment of a flap of a motor vehicle according to the preamble of claim 1 and to a method for the operation of such a drive arrangement according to claim 15.

The term "flap" is to be understood in the present case. Examples include a tailgate, a trunk lid, a hood, a side door, a load compartment, a lifting roof o. The like. A motor vehicle. Below is the application of a motor tailgate in the foreground, which is not to be understood as limiting.

In the course of progressive comfort increase in motor vehicles, the motorized adjustment of tailgates is becoming increasingly important. The optimal utilization of the available installation space plays an important role.

The known drive arrangement ( US 5,531,498 A ), from which the invention proceeds, is equipped with a spring arrangement of two gas springs, by which an automatic opening of the tailgate is effected. In addition to the spring arrangement, a motor arrangement is provided which operates via a motor drive train, which comprises a flexible force transmission element, here a cable, in the closing direction, ie against the spring arrangement.

Although a relatively good utilization of the available space can be achieved with the known drive arrangement. However, the manual adjustment of the tailgate is problematic. One reason for this is that the cable of the engine drive train is not recoverable.

The invention is based on the problem, the known drive arrangement to design and further develop such that a manual adjustment of the flap is ensured by simple structural means.

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

It is proposed that a compensation device is connected in the engine drive train, which retracts the flexible force transmission element, in particular spring-driven, in a movement introduced into the engine drive train against the pulling direction of the flexible force transmission element.

A movement introduced against the pulling direction of the flexible power transmission element into the engine drive train would in itself lead to a reduction in the tension in the flexible power transmission element and in the further course of the movement to slackening and thus uncontrollable positioning of the flexible force transmission element.

In order to avoid the above situation, the proposed compensation device is provided, which provides a corresponding retraction of the flexible power transmission element. An above movement against the pulling direction of the flexible power transmission element, which goes back to a manual adjustment of the flap in the closing direction, runs with the proposed solution for the first time reproducible, since the retraction of the flexible power transmission element by means of the balancing device can be controlled arbitrarily.

Preferably, the compensation device always ensures a predetermined minimum tensile stress of the flexible force transmission element. This ensures an orderly retraction of the flexible power transmission element. This minimum tension is preferably so low that it has no appreciable influence on the adjustment of the flap.

The retraction of the flexible power transmission element can take place, for example, by winding the flexible force transmission element, which will be explained in detail below. In an easy-to-implement variant according to claim 2, the retraction, which can go back in particular to a manual closing of the flap, initially accompanied by a transfer of the balancing device in a freewheeling state. Claim 3 in this sense relates to a particularly user-friendly design, in which the compensation device after retraction of the power transmission element by the drive motor from the freewheeling state in the drive state can be transferred, so that the drive assembly for the motorized adjustment is ready. Preferably, a control arrangement is provided which ensures that this "reset" of the compensating device immediately after drawing, in particular immediately after a manual adjustment in the closed position of the flap occurs.

In the further preferred embodiment according to claim 7, a winding roll is used twice, namely on the one hand for the transmission of drive movements and on the other hand for the winding-in retraction of the force transmission element. This dual use is inexpensive and leads to a particularly compact design.

In the further preferred embodiments according to claims 8 and 9, the compensation device is associated with a spindle-spindle nut gearbox, with which an above-mentioned provision of the compensation device by the drive motor with little design effort is feasible.

Simple variants for the realization of holding the flap in intermediate positions includes claim 11, in which an at least one-sided acting sprag freewheel is connected in the engine drive train.

The claims 12 to 14 relate to preferred structural configurations and arrangements of the spring assembly, the variant according to claim 13 relates to a particularly easy to implement embodiment of an end stop between the two housing parts of the spring assembly.

According to another teaching according to claim 15, which also has independent significance, a method for the operation of a proposed drive assembly is claimed.

Essential to the further teaching is that the compensation device is brought out of the freewheeling state and without adjustment of the flap in a drive state in which it provides a drive connection for the motor-side drive movements. As mentioned above, this control technology can be provided so that the compensation device is transferred immediately after a manual adjustment of the flap, in particular after a manual adjustment of the flap in the closed position, from the freewheeling state in the drive state, so that the drive assembly is always for a motor Adjustment is ready.

In the following the invention will be explained in more detail with reference to a drawing showing only one exemplary embodiment. In the drawing shows

1 2 shows a schematic side view of the rear area of a motor vehicle with a proposed drive arrangement,

2 the motor vehicle according to 1 in a rear view with the flap removed,

3 one in 2 shown spring arrangement of the motor vehicle in a longitudinal section,

4 the equalizer of in 2 illustrated drive arrangement a) when the tailgate is closed, b) when the tailgate is open by engine and c) when the tailgate is closed manually and

5 a sectional view of the motor vehicle according to 2 along the section line III-III.

The drive arrangement shown in the drawing serves to adjust a flap 1 a motor vehicle between a closed position and an open position. The term "flap" is to be understood in the present case. In that regard, reference may be made to the statements in the introductory part of the description.

The structural design of the drive assembly is of particular importance in the present case. The drive assembly has in addition to two spring arrangements 2 each with at least one spring element 2a . 2 B also a motor assembly 3 with at least one drive motor 3a and here and preferably a drive motor 3a downstream transmission 3b on. The following is in the sense of a simple representation almost entirely of a single spring arrangement 2 the speech. All relevant explanations apply in principle to both spring arrangements 2 ,

The engine arrangement 3 is here and preferably in the flap 1 , In principle, the engine arrangement can 3 but also in the body, especially in the rear roof frame of the motor vehicle.

The spring arrangement 2 and the engine assembly 3 are each drive technology with the flap 1 coupled, as best shown in the illustration 2 can be removed.

To adjust the flap 1 the engine arrangement works 3 via a motor drive train 4 against the spring arrangement 2 on the flap 1 , In the present case, this means that the spring arrangement 2 the flap 1 basically in the in 1 shown in a solid line drives open position while the engine assembly 3 the spring arrangement 2 counteracts. By the engine arrangement 3 can the spring-driven adjustment in the direction of the open position slow down or the flap 1 against the force of the spring assembly 2 Adjust in the direction of the closed position. Noteworthy is the fact that the engine assembly 3 only has to work in a single drive direction, here and preferably in the closing direction of the flap 1 , This results in a particularly compact design of the engine drive train 4 , Proposed according to the engine drivetrain 4 a flexible power transmission element 5 for transmission of the motorized adjustment of the flap 1 required drive movements. In the flexible power transmission element 5 it may be, for example, a rope, as will be explained.

It is essential now that in the engine drivetrain 4 a compensation device 6 is switched, the one against the pulling direction 7 the flexible power transmission element 5 in the engine driveline 4 initiated movement of the flexible power transmission element 5 especially spring-fed moves. With "pulling direction" is the on the flexible power transmission element 5 meant acting force direction, through which a tensile stress in the flexible power transmission element 5 is produced.

A synopsis of 1 . 2 and 3 gives the basic operation of the proposed drive arrangement. At the in 1 illustrated open position of the flap 1 is the spring arrangement 2 in a feathered state. The flap 1 is determined by the spring force of the spring assembly 2 against the weight of the flap 1 held in the open position. The motorized adjustment of the flap 1 in the direction of the closed position is by a corresponding control of the motor assembly 3 triggered. This is the engine assembly 3 a corresponding control arrangement 3c assigned. In this case, in a manner to be explained, the flexible power transmission element 5 loaded on train, resulting in a compression of the spring assembly 2 accompanied. The compression of the spring arrangement 2 is with a shortening of in 3 connected arrangement shown connected.

The effect of the engine arrangement 3 overlaid with the effect of the spring arrangement 2 such that with suitable control of the motor assembly 3 an adjustment of the flap 1 in the closing direction results. At a reduction of the tension in the flexible power transmission element 5 , which by a corresponding control of the motor assembly 3 is feasible, can the flap 1 turn spring-operated in the opening direction.

Of particular importance is now the manual adjustment of the flap 1 in the closing direction from the in 1 outlined in a solid line flap position out. Such a manual adjustment initially leads to a reduction in the tension of the flexible power transmission element 5 , so that this is a movement against the pulling direction of the flexible power transmission element 5 as defined above. Basically, such a manual adjustment would be the flap 1 from the open position to a substantially force-free state of the flexible power transmission element 5 lead, leaving the flexible power transmission element 5 largely undefined and aligned.

To always a defined position and orientation of the flexible power transmission element 5 to ensure it is as suggested above according to such that the flexible power transmission element 5 here and preferably spring-driven by means of a balancing device 6 is withdrawn. A possible implementation of the spring-driven retraction of the flexible power transmission element 5 will be explained below.

In a particularly preferred embodiment, the compensation device ensures 6 here and preferably spring-driven a predetermined minimum tensile stress in the flexible power transmission element 5 , The equalizer 6 thus ensures that the flexible power transmission element 5 at no time limp in the area of the engine drivetrain 4 "Hanging around".

The equalizer 6 In the present case, not only does the function of retracting the flexible power transmission element come into play 5 to, but also the provision of a drive connection for the above-mentioned, motor-side drive movements. This drive connection is in any case in the fully extended state of the compensation device 6 , This condition arises in particular when the flexible power transmission element 5 completely out of the equalizer 6 pulled out.

In the illustrated and insofar preferred embodiment corresponds to the manual adjustment of the flap 1 from the open position to the firing position of the adjustment of the compensation device 6 from the fully extended state to the fully retracted state. That means that for the motorized adjustment of the flap 1 required drive connection anyway in the open position of the flap 1 consists.

By retracting the power transmission means 5 reaches the balancing device 6 first in still to be explained way a freewheeling state in which it provides a freewheel for the motor-side drive movements. The freewheel can be biased accordingly, provided that the retraction of the power transmission element 5 as indicated above is spring-driven. In this case, the length of the freewheel corresponds to the respective insertion length of the force transmission element 5 , So far, the compensation device corresponds 6 another in the drive train 4 switched winding roller assembly for the power transmission element 5 whose winding roll is biased in the winding direction relative to the associated winding roll axis. In such an arrangement, the force is applied on the one hand on the winding roll axis and on the other hand on the winding roll.

Of particular interest in the illustrated embodiment, however, is that the compensation device 6 out of the freewheeling state and without adjusting the flap 1 and in particular without movement of the power transmission element 5 in a drive state can be brought, in which it provides a drive connection for the motor-side drive movements. In a particularly preferred embodiment, this is motorized by the drive motor 3a triggered, as explained below.

For the design of the flexible power transmission element 5 are numerous advantageous variants conceivable. Here and preferably, it is the flexible power transmission torque 5 around a rope. The term "rope" is to be understood broadly. It includes not only pliable arrangements, but also bowdenzugartige arrangements. It is also conceivable that the flexible power transmission element 5 as a band, in particular as a flat band, which preferably consists of a plastic material is configured. In certain applications, it may also be advantageous for the flexible power transmission element 5 to design as a chain.

In particular, in the embodiment of the flexible power transmission element 5 as a rope is the engine assembly 3 for transmitting drive movements with a drive roller, here and preferably with a winding roller 8th , for the flexible power transmission element 5 fitted. The embodiment of the winding roll 8th results from a synopsis of 2 and 4 , The winding roll 8th is here and preferably with a drive shaft 9 one the drive motor 3a downstream transmission 3b coupled. Basically, the winding roll 8th but also with the drive shaft of the drive motor 3a be coupled or coupled.

Here and preferably, the retraction of the force transmission element 5 on a winding of the power transmission element 5 on the winding roll 8th back. For this purpose, the winding roll is present 8th the engine assembly 3 used by the equalizer 6 for retracting the power transmission element 5 between the winding roll 8th and the drive shaft 9 provides a freewheel, wherein the spring-driven pulling one on the winding roll 8th acting spring arrangement 10 is provided.

4 shows that by means of the spring arrangement 10 a spring preload of the winding roll 8th opposite the associated drive shaft 9 can be generated. With a suitable design can be achieved that the flexible power transmission means 5 when pulling through the compensation device 6 as mentioned above spring-driven on the winding roll 8th is wound up. Such a spring-driven winding is structurally simple and therefore inexpensive to implement.

Here and preferably it is the case that the compensation device 6 a spindle spindle nut transmission 11 wherein, for retraction of the flexible power transmission means 5 the spindle nut 13 spring-driven on the spindle 12 running. The spindle nut 13 is preferably for generating a spring bias relative to a rotation relative to the spindle 12 by the spring arrangement 10 spring biased.

The above-mentioned freewheel between the winding roll 8th and the drive shaft 9 can be in a structurally simple way by the possible relative movement between the spindle 12 and spindle nut 13 of spindle spindle nut transmission 11 provide.

Here and preferably, the spindle 12 with the drive shaft 9 coupled and the winding roll 8th with the spindle nut 13 coupled. In detail, in the illustrated embodiment, the spindle nut 13 from the winding roll 8th self provides. Furthermore, this is the spindle 12 around the drive shaft 9 of the drive motor 3a downstream transmission 3b ,

To provide a drive connection for the motor-side drive movements and thus the drive state of the compensation device 6 is a running spindle nut 13 on the spindle 12 limiting stop 12a provided here and preferably on the spindle 12 is arranged. A motorized adjustment of the flap 1 is only possible here, as long as the spindle nut 13 or the winding roll 8th engaged with the stop 12a stands, so that the spindle nut 13 from a drive movement of the spindle 12 is taken.

The operation of a spindle spindle nut gearbox 11 equipped compensation device 6 follows from the illustration according to 4 , 4 First, that shows the winding roll 8th associated spring element 10 both with the drive shaft 9 as well as with the winding roll 8th coupled drive technology, so that the winding roll 8th as mentioned above can be spring-biased. Starting from the in 4a) shown, closed flap position causes a motorized adjustment of the winding roll 8th an opening of the flap ( 4b ), by the tension in the flexible power transmission element 5 is reduced. From the in 4b) shown state can be controlled by appropriate control of the drive motor 3a again the condition 4a ), causing an adjustment of the flap 1 back to the closed position corresponds.

Will shut up, though 1 from the in 4b) illustrated state of the open flap 1 Manually adjusted to the closed position, this results in the 4c) illustrated state. These manual adjustment of the flap 1 is with a retraction of the flexible power transmission element 5 So with the winding of the flexible power transmission element 5 on the winding roll 8th , connected. This winding is spring-driven by the winding roll 8th associated spring arrangement 10 , Accordingly designed as spindle nut winding roll runs 8th along the spindle 12 how a synopsis of the 4b) and 4c) results. When retracting the flexible power transmission element 5 relaxes the winding roll 8th associated spring element 10 at least partially. This can also be a synopsis of 4b) and 4c) remove.

At the in 4c) the situation shown is the balancing device 6 in free-running condition. In the in the 4a) and 4b) is the compensation device 6 in the drive state, since the winding roll 8th engaged with the stop 12a stands. From the in 4c) shown freewheeling state leads an engine-side drive movement only to a running of the winding roll 8th in 4 up towards the stop 12a without any adjustment of the flap 1 he follows. Interesting is the fact that exactly this motor process to a transfer of the compensation device 6 from the freewheeling state back into the drive state, without it being an adjustment of the flap 1 or a movement of the flexible power transmission element 5 requirement.

In a particularly preferred embodiment, it is now provided that after retraction of the force transmission element 5 the above, motorized transfer of the compensation device 6 is triggered in the drive state. This is preferably done by the control arrangement 3c triggered when the flap 1 manually adjusted to the closed position. For this purpose, for example, a flap position sensor may be provided which is of the control arrangement 3c is read out.

In principle, it can be provided that the drive motor 3a together with a here and preferably downstream transmission 3b self-locking is designed. 4 shows that the manual closing of the flap 1 just as well as explained above. The manual opening of the flap 1 here must always the transfer of the compensation device 6 precede the freewheeling state, since the self-locking of the motor assembly 3 would lead to a blockage of the flap movement. The transfer to the freewheeling state is again by means of the drive motor 3a feasible without causing a flap movement or movement of the power transmission element 5 requirement.

In a particularly preferred embodiment, the drive motor 3a together with a here and preferably downstream transmission 3b non-self-locking designed. While manually closing the flap 1 Here as in the self-locking drive expires, arises when opening the door manually 1 an interesting effect. When opening the door manually 1 becomes the entire engine assembly 3 driven back, without causing a retraction of the flexible power transmission element 5 comes. Unless the manual adjustment of the flap 1 is interrupted in the direction of the open position, holds the engine assembly 3 the flap 1 with a suitable design in their respective intermediate position. This is particularly advantageous because of unexpected displacement movements of the flap 1 after releasing the flap 1 be avoided by the user.

Basically, it is desirable especially in the latter variant, the self-locking of the motor assembly 3 To be able to set as accurately as possible without having to accept excessive friction losses during the motor adjustment. For this purpose, it is preferably provided that in the engine drive train 4 a special coupling arrangement 14 with a drive connection 15 and an output connection 16 is switched. Here and preferably, the coupling arrangement is located 14 between the gearbox 3b and the spindle 12 , The basic structure of such a coupling arrangement 14 shows 5 ,

The coupling arrangement 14 is preferably designed such that it has a drive-side initiated movement, so a motor-initiated drive movement, to the output terminal 16 by guides.

The coupling arrangement 14 is here further with a brake assembly 17 equipped, the braking of a driven side initiated movement, such as a manual opening movement of the flap 1 , serves.

The brake assembly 17 has a braking element adjustable against a braking force 18 on. The coupling arrangement 14 points between the output connection 16 and the brake element 18 a freewheel arrangement 19 from at least one, here exactly one, sprag freewheel 20 on. A movement initiated on the output side, for example a movement initiated on the flap, always causes the clamping body freewheel to be locked 20 so that movement over the brake assembly 17 is slowed down. A drive-side initiated movement always causes the release of the sprag freewheel 20 , so that here the motor-side movement unbraked on the spindle 12 is forwarded.

5 shows that with a drive-side initiated movement of the drive connection 15 against the respective sprag freewheel 20 push and disengage it from the output connector 16 and brake element 18 formed funnel 21 suppressed. Conversely, a movement initiated on the output side, in 5 left, the clamping of the sprag freewheel 20 in the funnel 21 into it, so that the movement initiated on the output side via the brake element 18 is slowed down.

With the above coupling arrangement 14 let the self-locking of the motor assembly 3 total set exactly, so that when manually opening the flap 1 with non-self-locking drive holding the flap 1 guaranteed in any intermediate position.

3 shows the basic structure of the spring assembly 2 , This illustration can be seen that the spring arrangement 2 two spring elements 2a . 2 B having, wherein the spring element 2a always in engagement with the flap 1 stands while the spring 2 B only at a predetermined deflection of the spring assembly 2 engaged with the flap 1 comes. In principle, however, it can also be provided that the spring elements 2a . 2 B simultaneously engaged with the flap 1 stand. At the spring elements 2a . 2 B are here and preferably coil springs, in particular helical compression springs. Other types of springs can be used here.

Interesting in the 3 illustrated and so far preferred embodiment is the fact that the spring assembly 2 a spring housing 23 having, that the two spring elements 2a . 2 B receives. In a particularly preferred embodiment, the spring housing 23 for compression 2 telescopically adjustable housing parts 23a . 23b on, which in a particularly simple manner, an encapsulated structure of the spring assembly 2 is feasible.

In the illustrated and so far preferred embodiment of the spring assembly 2 a motor drive train 4 associated with at least a portion of the engine drivetrain 4 that is, at least a portion of the power transmission element 5 , through the spring housing 23 , passes through. Through this nesting of spring arrangement 2 and engine drivetrain 4 This results in a particularly compact design.

Interesting in the 3 illustrated embodiment is also the structurally simple realization of an end stop. For this purpose, it is preferably provided that a flexible end stop power transmission element 24 inside the spring housing 23 which is the two housing parts 23a . 23b connects together such that the telescoping through the length of the flexible end stop power transmission element 24 is limited. As a result of that 3 a sprung state of the spring assembly 2 shows, the limit stop power transmission element depends only limp.

It is best done according to the presentation 2 Take that two spring arrangements 2 each with a spring drive train 22 are provided on two opposite sides of the flap 1 on the flap 1 Act. In a particularly preferred embodiment, the two spring drive trains are located 22 with the flap closed 1 in gutters, located in the side areas of the flap 1 are located.

The representation according to 2 can also be seen that the two spring drive trains 22 one engine drive train each 4 is assigned, wherein the two motor drive trains 4 also on two opposite sides of the flap 1 on the flap 1 Act.

According to another teaching, which also has independent significance, a method for the operation of a proposed drive arrangement is claimed.

Essential to the proposed method is the fact that the located in a retracted state compensating device 6 , Preferably in response to the flap position, and in any case without a flap movement, driven by the drive motor 3a is brought into the drive state.

The proposed method takes into account the fact that, especially after a manual adjustment of the flap 1 in the closed position, a transfer of the compensation device 6 from the freewheel state to the drive state is required to ensure that a subsequent motorized adjustment of the flap 1 is possible without delay.

On all versions of the proposed drive assembly, which are suitable to explain the proposed method, may be referenced.

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

• US 5531498 A [0004]

Claims (15)

Drive arrangement for the adjustment of a flap ( 1 ) of a motor vehicle between a closed position and an open position, wherein at least one spring arrangement ( 2 ) with at least one spring element ( 2a . 2 B ) and a motor assembly ( 3 ) with at least one drive motor ( 3a ) and possibly one of the drive motor ( 3a ) downstream transmission ( 3b ) are provided, wherein the spring arrangement ( 2 ) and the motor assembly ( 3 ) each drive with the flap ( 1 ), wherein for adjusting the flap ( 1 ) the engine assembly ( 3 ) via a motor drive train ( 4 ) against the spring arrangement ( 2 ) on the flap ( 1 ) and wherein the engine driveline ( 4 ) a flexible power transmission element ( 5 ) for unidirectional transmission of drive movements, characterized in that in the engine driveline ( 4 ) a balancing device ( 6 ) is switched, which in one against the pulling direction ( 7 ) of the flexible power transmission element ( 5 ) in the engine drivetrain ( 4 ) initiated movement, in particular in a manual adjustment of the flap ( 1 ) in the closing direction, the flexible power transmission element ( 5 ) retracts in particular spring-driven. Drive arrangement according to claim 1, characterized in that the compensation device ( 6 ) by pulling first reaches a freewheeling state in which it provides a freewheel for the motor-side drive movements, preferably, that the length of the freewheel of the insertion length of the force transmission element ( 5 ) corresponds. Drive arrangement according to claim 2, characterized in that the compensation device ( 6 ) from the freewheeling state and without adjustment of the flap ( 1 ) can be brought into a drive state in which it provides a drive connection for the motor-side drive movements. Drive arrangement according to claim 3, characterized in that the compensation device (11) located in the freewheeling state ( 6 ) without a flap movement, driven by the drive motor ( 3a ), in the drive state can be brought. Drive arrangement according to one of the preceding claims, characterized in that the flexible power transmission element ( 5 ) is designed as a rope, band or chain. Drive arrangement according to one of the preceding claims, characterized in that the motor arrangement ( 3 ) a drive roller, in particular a winding roller ( 8th ), for the flexible power transmission element ( 5 ), which with a drive shaft ( 9 ) of the drive motor ( 3a ) or one of the drive motor ( 3a ) downstream transmission ( 3b ) is drive-coupled or can be coupled. Drive arrangement according to claim 6, characterized in that the retraction of the force transmission element ( 5 ) on a winding of the power transmission element ( 5 ) on the winding roll ( 8th ), preferably that the balancing device ( 6 ) for retracting the power transmission element ( 5 ) between the winding roll ( 8th ) and the drive shaft ( 9 ) provides a freewheel, preferably that the compensation device ( 6 ) for spring-driven pulling a on the winding roll ( 8th ) acting spring arrangement ( 10 ) having. Drive arrangement according to one of the preceding claims, characterized in that the compensation device ( 6 ) a spindle spindle nut transmission ( 11 ) and that the freewheel between the winding roll ( 8th ) and the drive shaft ( 9 ) by the relative movement between spindle ( 12 ) and spindle nut ( 13 ) of the spindle spindle nut transmission ( 11 ), preferably that the spindle ( 12 ) with the drive shaft ( 9 ) and that the winding roll ( 8th ) with the spindle nut ( 13 ), preferably that the winding roll ( 8th ) even the spindle nut ( 13 ). Drive arrangement according to claim 8, characterized in that the running of the spindle nut ( 13 ) on the spindle ( 12 ) limiting stop ( 12a ) is provided, which has a drive connection for the motor-side drive movements and thus the drive state of the compensation device ( 6 ). Drive arrangement according to one of the preceding claims, characterized in that the drive motor ( 3a ) together with a possibly downstream transmission ( 3b ) is self-locking, or that the drive motor ( 3a ) together with a possibly downstream transmission ( 3b ) is designed non-self-locking. Drive arrangement according to one of the preceding claims, characterized in that in the engine drive train ( 4 ) a clutch arrangement ( 14 ) with a drive connection ( 15 ) and an output connection ( 16 ), which is a drive-side initiated movement to the output terminal ( 16 ) and a brake assembly ( 17 ) for braking a driven side introduced movement, preferably, that the brake assembly ( 17 ) a braking element adjustable against a braking force ( 18 ), that the coupling arrangement ( 14 ) between the output connection ( 16 ) and the braking element ( 18 ) a freewheel arrangement ( 19 ) of at least one sprag freewheel ( 20 ) and that an output side initiated movement always the Locking the sprag freewheel ( 20 ) and correspondingly via the brake assembly ( 17 ) is braked and a drive-side initiated movement always releasing the sprag freewheel ( 20 ) causes. Drive arrangement according to one of the preceding claims, characterized in that the spring element ( 2a . 2 B ) is designed as a helical spring, in particular as a helical compression spring, preferably that the spring arrangement ( 2 ) at least two spring elements ( 2a . 2 B ), which in the course of compression of the spring arrangement ( 2 ) simultaneously or successively frictionally engaged with the flap ( 1 ) come. Drive arrangement according to one of the preceding claims, characterized in that the spring arrangement ( 2 ) a spring housing ( 23 ), preferably that the spring housing ( 23 ) for compression two telescopically adjustable housing parts ( 23a . 23b ), preferably that a flexible end stop power transmission element ( 24 ), in particular a rope, a band or a chain is provided, the two housing parts ( 23a . 23b ) in such a way that the telescoping through the length of the flexible end stop force transmission element ( 24 ) is limited. Drive arrangement according to one of the preceding claims, characterized in that two spring arrangements ( 2 ) provided on two opposite sides of the flap ( 1 ) on the flap ( 1 ), preferably that the two spring arrangements ( 2 ) a motor drive train ( 4 ) and that the two motor drive trains ( 4 ) on two opposite sides of the flap ( 1 ) on the flap ( 1 ) Act. Method for operating a drive arrangement according to one of the preceding claims, wherein the compensation device ( 6 ) by the insertion of the flexible power transmission element ( 5 ) first reaches a freewheeling state, in which it provides a freewheel for the motor-side drive movements, characterized in that after retraction of the flexible force transmission element ( 5 ) the equalizing device ( 6 ) from the freewheeling state and without adjustment of the flap ( 1 ) is brought into a drive state in which it provides a drive connection for the motor-side drive movements.

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