DE102015224101A1 - Actuator and actuator for an automatic transmission and use of a drive module for such an actuator unit - Google Patents

Abstract

The invention relates to an actuating unit (2) for an automatic transmission, wherein the actuating unit (2) has a mechanical kinematics (13, 14, 15, 16, 17, 18) for adjusting an actuating device for the automatic transmission, wherein the kinematics (13, 14 , 15, 16, 17, 18) is designed and set up such that in a first adjustment range s1 a first actuating force F1 and a first actuating speed v1 act on the actuating device, and in a second, subsequent adjusting range s2 a second actuating force F2 and a second Actuate speed v2 act on the actuator, wherein the first operating force F1 is greater than the second operating force F2 and the first operating speed v1 is smaller than the second operating speed v2. It further relates to an actuator for an automatic transmission with such an actuating unit (2) and a drive (10, 11) for the actuating unit (2), wherein the drive (10, 11) preferably as a linear actuator, in particular as a spindle drive or linear piston Cylinder unit is formed. It finally relates to a use of a drive module (3) with a linear actuator for driving such an actuating unit (2).

Description

The invention relates to an actuating unit for an automatic transmission, wherein the actuating unit has a mechanical kinematics for adjusting an actuating device for the automatic transmission. The invention further relates to an actuator for an automatic transmission with such an actuating unit and to a use of a drive module for driving such an actuating unit.

Actuating actuators are known from the prior art, which have an actuating force as their output variable with constant force characteristic curve over their operating range. This means that the actuation force exerted by means of such an actuating actuator for shifting a transmission is independent of the respective adjustment path and the transmission is always actuated with an actuating force of constant and in each case the same height. This is associated with disadvantages for the reasons listed below.

An actuator for an automatic transmission must have its shift positions or transmission states P (park / parking lock), R (reverse), N (neutral / idle) and D (drive) and, if necessary, other driving steps such as, for example. S for sports programs, etc. cover and switch in the desired manner. On the one hand, the level of operating force required for laying out the parking lock P is usually significantly higher than that for engaging and disengaging the driving steps (states or gears) R, N and D and, if necessary, additionally existing driving steps as well as for engaging the parking brake. The reason for this is that the normally self-locking parking lock, e.g. when parked in a downhill gradient, must be interpretable under high force. On the other hand, a maximum allowable time is set for the transition from P to D for reasons of comfort. Consequence are for engaging or disengaging the respective switching stages differently required actuating forces and operating speeds.

In a known actuator with a constant force characteristic, it is disadvantageous that it must have a high performance in order to provide the required for engaging and disengaging the parking brake P high actuation force at the same time fast switching behavior available. If the actuator is used with such a high level of performance, a clear excess of force is present for engaging and disengaging the other switching stages R, N and D, which can not be used. Thus, the actuator can meet the dynamic requirements, therefore, a large and energetically oversized actuator is needed.

Based on the aforementioned prior art, the object of the present invention is to provide an actuating unit for an automatic transmission or an actuator for an automatic transmission which does not have the aforementioned disadvantages and in particular with the lowest possible drive power and low weight and size is designed.

This object is achieved in a generic actuator according to the invention in that the kinematics of the actuator is designed and set up that in a first Verstellwegbereich, which can also be referred to as the first operating range, a first actuating force F ₁ and a first operating speed v ₁ on the Actuate act, and in a second, subsequent Verstellwegbereich, which can also be referred to as a second operating range, a second actuating force F ₂ and a second operating speed v _{2 act} on the actuator, wherein the first actuating force F _{1 is} greater than the second actuating force F _2nd and the first operation speed v _{1 is} smaller than the second operation speed v ₂ . In this context, the first and the second actuating force are to be understood in particular to mean an actuating force averaged over the corresponding adjustment range.

In other words, a relatively high actuation force is applied slowly in the first actuation region and a relatively low actuation force is quickly applied in the second actuation region. Since the product of actuation force and actuation speed is proportional to the power required for actuation, the power required for each of the different actuations is optimally small. The available when laying out the parking brake operating force and operating speed are designed so that the available maximum time can be met. As a result, putting in and out of the other switching stages R, N and D (as well as possibly existing additional switching stages) can be switched quickly, as well as an engagement of the parking brake can be done quickly. Overall, the actuator unit and provided with this actuator can be built smaller and lighter than in the prior art.

According to a further aspect of the invention, the object underlying this is achieved by an actuator for an automatic transmission with an actuating unit according to one of the appended claims, in particular with an actuating unit according to the disclosure of the present description, and a drive for the actuating unit, the drive preferably as Linear actuator, in particular as a spindle drive, for example with axially fixed spindle nut and axialpositionierbarer spindle or can be designed as a linear piston-cylinder unit.

According to a further aspect, the object underlying the invention is achieved by using a drive module with a linear actuator, in particular with an electromechanical linear actuator, for driving an actuating unit according to one of the appended claims, in particular with an actuating unit according to the disclosure of the present description.

Advantageous embodiments of the invention are claimed in the subclaims and are explained in more detail below.

In one embodiment of the invention, the kinematics can be designed and set up such that a change in the actuating force F over the adjustment path, in particular from the first to the second adjustment range, is non-linear. In this way, a harmonic switching operation can be effected.

According to one embodiment of the invention, the kinematics is designed as a spindle spindle nut drive. This has a spindle and a spindle nut threadedly engaged therewith. In one embodiment, the spindle can be connected or connected directly or indirectly, for example via an actuating device, to an automatic transmission. The spindle nut in turn can then be connected to a drive for the actuating unit or connected in the case of an actuator. It is within the scope of the invention, when the arrangement described above is formed vice versa, so the spindle with a drive and the spindle nut are connected to an actuating device or connectable.

The actuating unit according to the invention may comprise a housing or a housing part which surrounds and accommodates the entire actuating device or parts thereof and optionally a drive or parts thereof. In the housing or housing part, the spindle nut and / or the spindle and optionally further elements and / or units of the actuating device are received and stored.

The spindle has a spindle thread, which is preferably designed as an external thread. The spindle nut has a first female thread and a second female thread. The slopes of the first parent wind and the second nut thread are different. It can also be said that the thread pitch of the first nut thread is formed differently from the thread pitch of the second nut thread. One of the two female threads is engaged with the spindle thread.

In one form of the invention, the spindle may be axially positionable and rotationally fixed in relation to the housing or the housing part. The spindle nut is preferably floating in this respect. Floating in this context means that the spindle nut is floating in relation to the housing. One can also say that it is rotatable relative to the housing as well as axially. The spindle nut is further rotatable to the spindle and thus relatively positioned relative to the spindle in the axial direction due to the threaded engagement with the spindle in a mutual rotation. In another embodiment, the spindle can be floating and the spindle nut axially positionable and rotatably mounted. The above comments apply accordingly in reverse.

The spindle nut may be formed in a form of the invention as a double-threaded nut with an internal thread and an external thread. In particular, the first nut thread can be formed as an internal thread and the second nut thread as an external thread. This allows a particularly compact embodiment of the actuator unit according to the invention in the axial direction. In variants, in the context of the invention, both nut threads can be formed as internal threads or as external threads, for example, if an axially very slim actuating device is to be realized.

The spindle nut is driven in one embodiment of the invention or operatively connected to a drive. This can be accomplished according to the invention by threadably engaging, for example, a rotor of a stator-rotor unit forming a drive. The rotor cooperates with the stator, which is axially and non-rotatably received in the housing or the housing part, and is driven by this and rotated. The rotor is mounted in the housing. If this drive is energized, the rotor rotates in the housing relative to the stator. The direction of rotation and rotational speed of the rotor is freely selectable according to the invention and adjustable, controllable, controllable.

In one form of the invention, the spindle (in the case of a floating spindle nut) acts indirectly or directly on an actuating unit for actuating the automatic transmission. In the alternative embodiment, in which the spindle is mounted floating, the spindle nut can act directly or indirectly on the actuator unit. In both cases causes a change in position of the spindle (at floating Spindle nut) or the spindle nut (with floating spindle) in this way an actuation of the actuator unit and about a switching of the connected automatic transmission in one of the gear stages P, R, N, D or possibly existing further switching stages. The direction of the switching process depends on the direction of the drive of the actuator.

It is particularly advantageous if the first female thread has at least one end stop with a stop face. Alternatively or additionally, the second nut thread having an end stop with a stop surface. The stop surface is preferably aligned transversely, in particular orthogonally, to the thread of the corresponding thread. The spindle thread and / or the mating thread of the rotor (rotor thread) have a corresponding, mating formed counter-abutment surface.

According to one embodiment of the invention, the spindle nut is received in the rotor. In this case, the first nut thread of the spindle nut is engaged with a mating thread of the rotor. The second nut thread of the spindle nut is engaged with the spindle thread of the spindle.

Due to the different pitches of the first nut thread and the second nut thread in combination with the floating bearing of the spindle nut (or in an alternative embodiment as described above the spindle) it comes with a rotation of the rotor initially to a relative movement in the thread with the lower pitch , The reason for this is that, because of the smaller pitch angle, this thread has lower drag forces, such as friction, than is the case with the other pitch with a greater pitch. As a result of the relatively low pitch, it is therefore initially at a certain rotor speed to an axial positioning at a relatively low speed in the axial direction. In this case, a relatively high actuation force is transmitted. In the thread with the relatively larger pitch, there is no relative movement during this period. The area in which there is a relative movement in the thread with a small pitch, serves to release the parking brake. In this area, the required for laying out the parking brake high actuation force is provided. The operating speed is determined by suitable choice of the drive (rotor-stator) and designed so that the parking brake can be turned off in the desired time.

Upon completion of the relative movement in the thread with a relatively small pitch, for example, because an end stop of this thread is approached, begins with continuous rotation of the rotor, a relative movement of the thread with a relatively larger pitch. Due to the steeper (larger) inclination angle of this thread, therefore, an axial positioning at relatively high speed in the axial direction takes place at the aforementioned specific rotor speed. In this case, a relatively low operating force is transmitted. The area in which there is a relative movement in the thread with a large pitch, serves to switch the other switching states R, N and D (and possibly existing other driving steps) and an inserting the parking brake.

According to the invention, the different thread pitches of the first nut thread and the second nut thread are configured such that in the first adjustment range, the actuating force acts with a first amount F ₁ and the first operating speed v ₁ , and in the second, subsequent adjustment range, the actuating force with a second amount F ₂ and the second actuation speed v ₂ act, wherein F _{1 is} greater F ₂ and v _{1 is} smaller than v ₂ .

According to a separate embodiment, which can be completely detached from the other features of the invention described herein and can be realized and used independently, the actuating unit is biased in an actuating direction. Such bias can be directed and act in particular in the one inserting a parking brake of the automatic transmission causing actuation direction. It can be achieved according to the invention, for example by means of a mechanical spring unit, in particular by means of a coil spring. Preferably, the spring unit biases the spindle in the desired direction. Such biasing can be effected, for example, by supporting the spring unit on the one hand on the housing of the actuating device (or on another, axially fixed relative to the spindle element). On the other hand, it may be supported on the spindle, for example on a shoulder formed thereon or on a clamping ring (Seeger ring) arranged thereon, or on a connecting rod which is directly or indirectly operatively connected to the spindle and via which actuation of the transmission takes place.

It can also be said in this embodiment that the functionality of the biasing spring for a parking pawl is integrated in the connecting rod or the spindle. What is needed is the spring in case the parking pawl is to be inserted and does not hit a tooth gap, but a tooth tip. It is then not possible to insert the latch completely. However, in the case of rolling the vehicle to perform the lock function, the pawl is biased by the spring on the connecting rod (or the spindle), so that the Press the pawl into the tooth gap as soon as the vehicle has moved so far that the pawl no longer comes to rest on a tooth tip. So far, a similar locking function with bias was integrated into the transmission. With the actuator according to the invention, the function can also be arranged or formed externally, which is advantageously free space within the transmission space or remains (for other components / functions).

According to a further aspect of the invention, the actuating unit can be designed as an actuation module. In particular, it can have a housing which can be combined with a drive module, in particular can be flanged thereto. By such a modular system, a high cost due to design, manufacturing, parts management, parts management or warehousing can be significantly reduced.

It can also be said that the present invention proposes a parking brake actuator having 2 gears or ranges for the operation. In first gear or range, P can be laid out slowly but with increased force. In the further course, the remaining stages can be traversed at least partially faster over a then at least temporarily active second gear or area. The actuator has a linear actuator with a driving nut. The nut comprises two different threads, an inner thread and an outer thread. These have different slopes, i. a different translation. Switches over stops in the first thread. It can also be an energy storage for biasing the parking brake provided in the actuator, instead of as previously in the transmission.

The actuation actuator may have at least approximately constant force characteristics in subregions of the actuation path. If, according to the invention, a nonlinear characteristic curve of the actuator is used, all states except P can be traversed faster by the factor of force reduction in order to come from P to D, with a correspondingly adapted ratio. In this case, it is possible to reduce the actuator size. Although under certain circumstances the time required to lay out P is correspondingly greater, this time loss can at least be compensated for by the faster speeding through of the other speed stages due to the adapted ratio.

If a linear actuator is used as the "power source" (drive), there is the possibility of using a "basic actuator" or "basic drive unit" that can be produced or produced in large numbers, to which various transmission or actuation modules can be connected , So it is also within the scope of the invention to provide a PRND actuation module, which requires as input a linear piston (actuator) of the basic actuator and can interact with such and as output a spindle (or a spindle nut) for connection to the automatic transmission , An integrally constructed actuator including power source is also within the scope of the invention.

The prior art one-stage translation from rotary to linear motion (eg, by PWG, KGT, "simple" motor nut) is replaced in one embodiment of the invention by a two-stage nut. This nut comprises two threaded areas with different pitches. pitch 1 is chosen so that the engine is able to release the parking lock in the given time. pitch 2 is chosen so that the motor is able to perform circuits from R to D and vice versa and engage the parking brake (about the same level of force). pitch 1 is thus significantly smaller than slope 2 ,

The working range (possible axial travel) of the threaded area 1 with gradient 1 is at least the required way to solve the parking brake, then there is a stop. The actuator will always go the path of least resistance, so first thread area 1 with the smaller slope 1 is effective. The actuator moves slowly, but at a high force level. The threaded area 2 this does not cause any relative movement. Achieved thread area 1 the stopper becomes the threaded area 2 with the bigger slope 2 active. The actuator moves axially fast, but at a lower power level.

When the direction of rotation is reversed, the thread area will also be initially 1 effective. Although this is not necessary due to the load, but physically unreasonable to avoid. Since the actuator only has a low load requirement over the entire "return path" (even when the parking brake is engaged), this does not pose a problem with regard to force or operating time. Also when toggling between R and D (or N) always first thread area 1 to become active. But even here there are no dynamics problems, since the travel is correspondingly shorter.

So that the thread in the end stops is not self-locking, at least for the steep thread 1 a simple axial stop not effective. If this stop were reached at high speed, then due to the additional inertia, the release torque would be greater than the torque available by the engine (then without inertia). According to one embodiment, a stop in the thread itself is provided for this purpose is designed perpendicular to the screw axis of the thread geometry. Thus, a self-locking can be safely avoided. Thus, the spindle is secured against rotation during rotation of the motor, a rotation can be provided at the end of the spindle relative to the housing.

The invention will be explained in more detail by means of an embodiment with reference to drawings. Showing:

1 3 a sectional view of an actuator with a first embodiment of an actuating unit according to the invention in a sectional plane through the longitudinal axis of an actuating spindle,

2 a perspective view of the actuator of 1 .

3 a perspective view of a double nut of the actuator of 1 and

4 a sectional view of an actuator having a second embodiment with a biasing function and an actuating unit according to the invention in a sectional plane through the longitudinal axis of an actuating spindle.

The figures are merely schematic in nature and are only for the understanding of the invention. The same or comparable elements are provided with the same reference numerals.

1 shows an actuator 1 with an operating unit 2 according to the invention in a side view. The actor 1 serves to actuate an automatic transmission, not shown in the figures. It has a modular design and can be subdivided into a drive module 3 rather left in the figure and as actuation module 4 trained operating unit 2 rather right in the figure.

The actor 1 has a housing which consists of a drive module-side housing part 5 and an output side housing part 6 consists. There is a plug on the housing 7 designed for connection to a power and data line, not shown. Inside the housing part 5 is a circuit board 8th arranged over which a drive 9 is controlled. The drive 9 consists essentially of a stator 10 and a cooperating rotor 11 , The stator 10 is rotationally and axially fixed in the housing part 6 arranged. The rotor 11 is axially fixed but rotatable by means of a rotor bearing 12 stored. Will the drive 9 over the board 8th driven, the rotor becomes 11 relative to the stator 10 rotated, whose direction of rotation is controllable and reversible, so that the rotor can rotate clockwise and counterclockwise.

The rotor 11 is at its radially inner side with a rotor thread 13 (Internal thread) provided. This stands with an external thread 14 (second nut thread) engaged on a spindle nut 15 is trained. This is designed as a double nut and also has an internal thread 16 (first female thread) on the radially inner side of the spindle nut 15 is formed and with a spindle thread 17 a spindle 18 engaged. The trained as external thread second nut thread 14 and the first female thread formed as an internal thread 16 have different thread pitches. In the illustrated embodiment, the second nut thread 14 a larger thread pitch than the first nut thread 16 on.

The spindle 18 , in the 2 as a single part is shown in perspective, is at her in 1 left end with four radially outwardly projecting guide elements 19 provided, between each of which a gap 20 is. The guide elements 19 are at one on the spindle 18 screwed on guide sleeve 21 trained and engage in correspondingly trained guide grooves 22 one in the housing part 5 are provided. The spindle 18 is about in the Führungsnuten 22 engaging guide elements 19 against rotation and axially positionable in the housing part 5 guided. In other words, in this way an anti-rotation of the spindle 18 educated.

On the guide sleeve 21 opposite end of the spindle 18 , which is formed substantially hemispherical, is a stopper element 23 screwed on and with a radial direction in this engaging Sicherungssplint 24 Position saved. The stop element 23 is with an external thread 25 Mistake. On the hemisphere 26 the end of the spindle 18 is a connecting rod 27 deferred and with a locknut 28 secured. The connecting rod 27 indicates connection to the spindle 18 a fork 29 with also hemispherical inner as well as outer contour on. Also the lock nut 28 has a hemispherical inner contour, so that in total the connecting rod 27 can be fixed to the spindle so that misalignment can be compensated.

The connecting rod 27 is with her the spindle 18 opposite end with a switching mechanism 30 connected, which causes an actuation of an automatic transmission, not shown in the figures. The connecting rod 27 is by means of a bellows 31 covered, on the housing part 6 on the one hand and on the other hand on the operating unit 30 is arranged.

As in 3 can be clearly seen, has the first nut thread 16 the one as a double mother trained spindle nut 15 a stop surface 32 on. 2 shows that even those with the first nut thread 16 cooperating spindle 18 a corresponding stop surface 33 , here both on the guide sleeve 21 as well as on the stop element 23 , having. The stop surfaces 32 and 33 Each form a common end stop, which is a relative adjustment (rotation) of spindle 18 and double mother 15 limited. Both stop surfaces 32 . 33 are substantially orthogonal transverse to the respective threads of spindle thread 17 and nut thread 16 aligned, so that jamming in the end stop can be safely avoided and a reversal of direction without restriction is possible.

4 shows a further embodiment of an actuator 1 according to the invention, with a biasing device 34 which is detached from the actuator 1 and whose properties and characteristics can be used as a separate functional unit. The actor 1 of the 4 is essentially similar to that of 1 , so that the same or similar elements are provided with the same reference numerals and reference is made to the above description. The pretensioner 34 has a coil spring 35 on. At the switching mechanism 30 is one in the direction of the operating unit 2 projecting inner housing 36 screwed. This surrounds a section of the connecting rod 27 as well as the spiral spring 35 , The latter is on the one hand to the inner housing 36 and on the other hand, on the connecting rod 27 supported and spans these two elements against each other. Unlike the embodiment of the 1 is the connecting rod 27 not in the switching mechanism 30 screwed in, but only pushed in, allowing an actuation of the switching mechanism 30 through the spindle 18 and the associated connecting rod 27 over the spring 35 and the inner case 36 he follows. By this biasing device 34 is a relative movement of the switching mechanism 30 to the connecting rod 27 against the bias of the coil spring 35 possible, so that when the parking brake engaged but not in a tooth gap of the transmission engaging pawl can engage them due to the bias in a tooth gap when the vehicle rolls.

Due to the different gradients of the first nut thread 16 and the second nut thread 14 in combination with the floating bearing of the spindle nut 15 it comes with a rotation of the rotor 11 initially to a relative movement in the thread combination 16 . 17 with the lower slope. Reason is that in this thread combination 16 . 17 because of the lower pitch angle, lower drag forces, such as friction, act than with the other pitch combination 14 . 13 with a greater gradient is the case. As a result of the relatively small pitch, it is therefore initially at a certain rotor speed to an axial positioning of the spindle 18 at a relatively low speed in the axial direction (relative to the longitudinal axis of the spindle 18 ). In this case, a relatively high actuation force is transmitted. In the thread combination 13 . 14 with the relatively larger slope, there is no relative movement during this period.

Upon completion of the relative movement in the thread combination 16 . 17 with a relatively small pitch, for example because of the stop surfaces 32 . 33 formed end stop starts with continuous rotation of the rotor 11 a relative movement of the thread combination 13 . 14 with a relatively larger slope. Due to the steeper (larger) inclination angle of this thread combination 13 . 14 Therefore, it comes at the above-mentioned certain rotor speed to an axial positioning at a relatively high speed in the axial direction. In this case, a relatively low operating force is transmitted.

LIST OF REFERENCE NUMBERS

1

 actuator

2

 operating unit

3

 drive module

4

 actuation module

5

 housing part

6

 housing part

7

 plug

8th

 circuit board

9

 drive

10

 stator

11

 rotor

12

 rotor bearing

13

 rotor thread

14

 External thread / second nut thread

15

 spindle nut

16

 Internal thread / first nut thread

17

 spindle thread

18

 spindle

19

 guide element

20

 gap

21

 guide sleeve

22

 guide

23

 stop element

24

 cotter

25

 external thread

26

 hemisphere

27

 connecting rod

28

 locknut

29

 fork

30

 switching mechanism

31

 bellow

32

 stop surface

33

 stop surface

34

 biasing means

35

 spiral spring

36

 inner housing

Claims (10)

Actuating unit ( 2 ) for an automatic transmission, wherein the actuating unit ( 2 ) a mechanical kinematics ( 13 . 14 . 15 . 16 . 17 . 18 ) for adjusting an actuating device for the automatic transmission, wherein the kinematics ( 13 . 14 . 15 . 16 . 17 . 18 ) is designed and set up such that in a first adjustment range s ₁ a first actuation force F ₁ and a first actuation speed v _{1 act} on the actuation device, and in a second, subsequent adjustment path range s ₂ a second actuation force F ₂ and a second actuation speed v ₂ act on the actuator, wherein the first operating force F _{1 is} greater than the second operating force F ₂ and the first operating speed v _{1 is} smaller than the second operating speed v. ₂ Actuating unit ( 2 ) according to claim 1, characterized in that the kinematics ( 13 . 14 . 15 . 16 . 17 . 18 ) is designed and set up so that a change in the actuating force F over the adjustment path s is non-linear. Actuating unit ( 2 ) according to claim 1 or 2, characterized in that the kinematics ( 13 . 14 . 15 . 16 . 17 . 18 ) as spindle spindle nut drive ( 15 . 18 ) is formed, with a spindle ( 18 ) and a spindle nut threadably engaged therewith ( 15 ), wherein the spindle nut ( 15 ) a first female thread ( 16 ) and a second nut thread ( 14 ) with different slopes. Actuating unit ( 2 ) according to claim 3, characterized in that the first female thread ( 16 ) an internal thread and the second nut thread ( 14 ) is an external thread. Actuating unit ( 2 ) according to claim 3 or 4, characterized in that the spindle ( 18 ) is axially positionable and rotatably mounted and the spindle nut ( 15 ) is floating. Actuating unit ( 2 ) according to one of claims 3 to 5, characterized in that the first female thread ( 16 ) and / or the second female thread ( 14 ) at least one end stop with a stop surface ( 32 ), which is aligned transversely to the thread. Actuating unit ( 2 ) according to one of the preceding claims, characterized in that the actuating unit ( 2 ) is biased in an actuating direction. Actuating unit ( 2 ) according to one of the preceding claims, characterized in that it is used as actuation module ( 4 ) is formed and a housing ( 5 ), which is connected to a drive module ( 3 ) is combinable, in particular it can be flanged. Actuator ( 1 ) for an automatic transmission with an actuating unit ( 2 ) according to one of the preceding claims and a drive ( 10 . 11 ) for the operating unit ( 2 ), whereby the drive ( 10 . 11 ) is preferably designed as a linear actuator, in particular as a spindle drive or as a linear piston-cylinder unit. Use of a drive module ( 3 ) with a linear actuator for driving an actuating unit ( 2 ) according to any one of the preceding claims.

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