Actuating unit for automotive applications

Abstract

The subject matter of the invention is an actuating unit (1) for automotive applications, in particular a motor vehicle door latch or a lock, having a housing (5, 6, 7) with a drive (2) which is arranged in the housing (5, 6, 7), in particular a worm drive (4), an actuating element which is acted on by the drive (2), and at least one plain bearing (12) for receiving a bearing point (11) of the drive (2), in particular a worm (9) as a worm drive (4), wherein the plain bearing (12) can be held at least partially in a plastic, wherein the plastic can be formed as an elastomer ring (13).

Description

[0001] Description

[0002] Actuator for automotive applications

[0003] The invention relates to an actuating unit for automotive applications, in particular a motor vehicle door lock or a locking device, comprising a plastic housing, a drive arranged in the housing, in particular a worm drive, an actuating element which can be acted upon by the drive and at least one plain bearing for receiving a bearing point of the drive, in particular a worm of a worm drive, wherein the plain bearing is at least partially mounted in plastic.

[0004] In today's motor vehicles, more and more electrically assisted operating functions are being used. For example, electric drives are used for sliding doors or tailgates, as well as closing aids that move a door or tailgate from a pre-locking position to a main locking position, i.e. into a closed position. Such drives can also be used, for example, to move actuating elements in a motor vehicle door lock. Electric drives are used to close a door. These are either installed as separate modules in a side door, for example, or there are locking systems in which an electric drive is integrated. Electric drives are also installed in motor vehicles, for example to move a sliding door from a closed position to an open position and vice versa.

[0005] These drives are subject to stringent requirements, requiring a long service life, compact design, and cost-effective construction while simultaneously transmitting high power. Furthermore, the noise level of the drives plays a significant role, as this influences the comfort of the vehicle. To meet these requirements, various state-of-the-art solutions have been developed.

[0006] DE 10 2009 036 835 A1 discloses an actuating unit in the form of a closing aid for a motor vehicle, comprising a drive and a linear actuator actuated by the drive, the drive and the linear actuator being arranged at an angle to one another. To improve the overall noise level of the actuating unit, it is proposed, among other measures, to design the bearing point for the drive motor as a rubber bearing seat, with the drive being completely or partially accommodated in a rubber ring. In fact, the rubber ring is pot-shaped and accommodates a base of the drive.

[0007] In DE 10 2011 107 634 A1, the rubber bearing is defined more precisely according to DE 10 2009 036 835 A1. It is a cylindrical rubber bearing that is installed in the housing in a torsion-proof manner with receiving projections and essentially serves to secure the radial position. In fact, the actuator of the drive is designed as a linear actuator, in particular as a spindle drive, and is used to actuate a closing device.

[0008] The generic prior art is disclosed in DE 10 2013 012 732 A1. The document discloses an actuating unit for automotive applications, in particular motor vehicle closures or locking devices, with a plastic housing, with a drive arranged in the housing, in particular a worm drive, with an actuator that can be acted upon by the drive, and with at least one plain bearing for receiving the bearing point of the drive, in particular a worm of the worm drive, wherein the plain bearing additionally comprises a plastic casing at least in some regions. An electric drive carries a worm of a worm gear, wherein the worm is held at the end in a plain bearing. The plain bearing, in turn, is seated in a bearing seat in the housing. In order to improve noise behavior and counteract wear, the plain bearing has an elastomer casing on its outer surface.The screw end is held in the bearing seat by means of the elastomer coating.

[0009] The solutions known from the prior art are generally in need of improvement. For example, plastic-encased plain bearings are expensive to manufacture, especially if the plain bearing is only partially covered in plastic. Furthermore, mounting the drive in the housing using a plastic ring and pressing it into crush ribs is only partially suitable for eliminating tolerances in the manufacture of the plastic housing and ultimately ensuring the most tolerance-free intervention of the transmission parameters. This is where the invention comes in.

[0010] The object of the invention is to provide an improved actuator for automotive applications. In particular, the object of the invention is to provide a bearing for a drive for an actuator that is characterized by a long service life and low noise emissions. Furthermore, the bearing is intended to compensate for manufacturing tolerances and provide a simple and structurally advantageous solution.

[0011] The problem is solved by the features of independent claim 1. Advantageous embodiments of the invention are specified in the subclaims. It should be noted that the exemplary embodiments described below are not limiting; rather, any desired variations of the features described in the description and the subclaims are possible.

[0012] According to patent claim 1, the object of the invention is achieved in that an actuating unit for motor vehicle applications, in particular sliding door drives or motor vehicle door locks, is provided, comprising a housing with a drive, in particular a worm drive, an actuating element that can be acted upon by the drive and at least one plain bearing for receiving a bearing point of the drive, in particular a worm of the worm drive, wherein the plain bearing is at least partially held in a plastic, wherein the plastic can be designed as an elastomer ring. The design of the actuating unit according to the invention now creates the possibility of specifically influencing the bearing of the drive and in particular the worm drive. By designing a separate plastic component in the form of a plastic or.By using an elastomer ring as a bearing for the plain bearing, tolerance compensation can be achieved using the simplest of construction means. The elastomer ring surrounds the plain bearing completely, so that, depending on the tolerance in the housing, compensation can be made which also has a damping effect. On the one hand, manufacturing tolerances during production, particularly during injection molding of the housing parts, can be compensated for, and on the other hand, the damping effect of the plastic bearing can be used to reduce or eliminate noise emissions. The option of inserting a separate component between the housing and the plain bearing represents a structurally simple and cost-effective way of compensating for manufacturing tolerances.

[0013] Electric drives, for example for a sliding door, a tailgate or a door lock, can be regarded as actuating units within the meaning of the invention. But also, for example, a closing aid for a motor vehicle door lock, a fuel filler flap or charging plug lock or a door opener in the form of a prop that can be moved out of a motor vehicle lock can be named as embodiments. In fact, wherever electrically assisted actuating movements are used by means of a drive and in particular a worm drive. An actuating element is actuated by means of the drive, whereby the actuating element can also be, for example, a Bowden cable, a cable pull or a lever of a kinematic system connected downstream of the drive.

[0014] The drive is preferably an electric motor that is housed in the housing of the actuator. A gear, preferably a worm, is mounted on the motor's output shaft. A plain bearing is used at least for the end bearing of the worm or gear. Plain bearings are characterized by their small size and can also serve as a cost-effective solution for permanently stable bearings in a plastic housing. Plain bearings are high-precision components that can ensure a long service life. The worm of the gear can be provided with different toothings and can also have, for example, involute toothing.

[0015] Plastic housings, and in particular plastic housings for automotive applications, are preferably manufactured as injection-molded components. Components, and in particular housings, produced by thermal injection molding have tolerances which can be particularly disadvantageous if the plastic housings are used directly as bearing points for gearboxes. These tolerances can, on the one hand, have a negative impact on the service life and, on the other hand, can have a negative impact on the noise behavior of the actuator due to, for example, excessive play in the gearbox components. By using the separate elastomer ring between the plain bearing and the housing, tolerance compensation can take place according to the invention, so that a long service life can be guaranteed and, at the same time, the noise behavior of the actuator can be optimized.

[0016] The elastomer ring is made of an elastomeric plastic. Elastomeric materials, which can also be described as rubber-elastic materials, offer the advantage of having high damping properties. In particular when, for example, high speeds are generated in the drive, as is common with tiny motors in motor vehicle locksmiths, and the motors have to be mounted in the housing, the elastomeric plastics can be used advantageously for noise dampening. According to the invention, the plastic bearing is arranged between the housing part and the plain bearing. The plain bearing rests at least in some areas on the housing and is fixed in some areas in the housing by the plastic bearing and in particular the elastomeric material. Fixing the plain bearing in the housing using the elastomeric material can, on the one hand, compensate for tolerances and, on the other hand, serve to dampen noise.This means that low-noise operation can be combined with a long service life.

[0017] It can be advantageous according to the invention if the elastomer ring has a substantially round cross-sectional shape. The elastomer ring surrounds the plain bearing circumferentially and, in this preferred embodiment, has a substantially round cross-sectional shape. Round elastomer rings are known, for example, as sealing rings and are available in many different versions at low cost. This makes it possible to provide a plastic bearing which is available in many different shapes and which also offers a cost-effective option for shaft bearings. The diameter of the cross-section of the elastomer ring can be selected depending on the load on the screw or on the shaft end of the screw, so that sufficient damping and sufficiently stable bearing of the shaft end can be provided.Even if round cross-sections are preferred here, it is also conceivable to use oval or elliptical shapes, for example, as cross-sections for the elastomer ring. In any case, the cross-sectional shape ensures that there is linear contact between the elastomer ring and the bearing point in the housing of the actuating unit. The linear support can eliminate alignment errors and, in addition, certain tilting tolerances in the drive can be accommodated. If the elastomer ring can be received in a bearing point of the housing with a form-fitting fit, at least in some areas, this results in a further embodiment of the invention.On the one hand, the round cross-sectional shape of the elastomer ring can be advantageous in terms of tolerance compensation. In addition, the form-fitting accommodation of the elastomer ring in the housing itself can ensure secure mounting of the elastomer ring and thus secure hold of the plain bearing. For this purpose, for example, the housing can have a U-shaped opening into which the elastomer ring can be inserted. The elastomer ring can have a certain excess size so that a firm bearing seat for the shaft end of the drive can be achieved. A U-shaped opening in the housing also offers the advantage that a U-shape can be easily produced on a plastic housing of the actuator. The housing of the actuating unit is preferably manufactured as an injection-molded component so that a U-shaped bearing point can be easily produced using casting technology.It is conceivable for only a portion of the elastomer ring to come into contact with the housing around its circumference, but it is also conceivable for the housing bearing point to be U-shaped, for example, and for the elastomer ring to be able to be inserted into the U-shape, for example, over an angle of 180°, and to come into contact with the housing over its entire area. The bearing point is then fixed by a housing cover, which in turn bears positively against the elastomer ring at least in some areas. In this way, the housing and / or the housing cover can come into partial contact with the elastomer ring, i.e. in some areas, or the elastomer ring is completely enclosed by the housing and the housing cover. A further embodiment of the invention arises when the positive connection can be formed at least diametrically in the housing.A contact surface that is only present in certain areas offers the advantage of easy assembly and, at the same time, an advantageous design of the bearing point. If, for example, the bearing point in the housing forms a receptacle that can be described as U-shaped and the elastomer ring only comes into contact in certain areas at the lower end of the U and on the diametrically opposite side walls of the U, the loads from the drive can be transferred specifically into the housing. In other words, the design of the bearing point and the contact points on the housing can ensure that the increasing forces are introduced in a targeted manner. This is particularly advantageous if the housing has a higher level of rigidity at the contact points, so that targeted force can be transferred from the elastomer ring to the bearing point.

[0018] It has proven advantageous if the positive connection extends essentially in the joining direction of the drive, in particular the worm, in the housing. The elastomer ring which is to be introduced into the housing and extends around the plain bearing can be securely accommodated in the housing by means of the positive connection. A linear insertion of the shaft or worm end into the housing has proven advantageous as a joining direction. If there are recesses in the housing which cooperate with the elastomer ring, the elastomer ring can also be clamped in the bearing point by an excess dimension on the elastomer ring. Preferably, at least two depressions or cutouts arranged diametrically on the bearing housing are provided which cooperate with the elastomer ring. The excess dimension of the elastomer ring serves on the one hand to protrude into the recesses or to...to completely fill the recesses and, on the other hand, to compensate for misalignments of the shaft end or the worm. In addition to the diametrically arranged recesses or positive-lock openings in the housing, recesses can also be provided distributed around the circumference in the bearing location. For example, four depressions or recesses distributed evenly around the circumference can be provided in the housing and housing cover, enabling secure positioning of the elastomer ring and thus of the plain bearing and the shaft end.

[0019] It has proven particularly advantageous if the positive connection can be designed as a groove in the housing. If the housing has a U-shaped bearing seat for holding the elastomer ring, grooves can extend along the parallel sides of the U in the housing, so that safe and precise insertion of the elastomer ring into the housing can be guaranteed. Two opposing grooves enable precise insertion of the elastomer ring, with the grooves providing an insertion aid during assembly. The grooves, which form the positive connection between the elastomer ring and the housing, ensure easy assembly but also a secure fit of the elastomer ring in the housing. Assembly errors are prevented, and an exact fit of the elastomer ring in the housing can be achieved. The deformation of the elastomer ring is designed so that all tolerances that occur are compensated.Furthermore, the elastic bearing has the advantage that misalignment of the worm can be compensated for. In a further design variant, the elastomer ring can be accommodated in the plain bearing with a form-fitting fit, at least in some areas. To assemble the drive and in particular the worm or the bearing of the worm in the housing, the plain bearing is first mounted on the worm. The plain bearing is usually pushed over one shaft end of the worm so that the end of the worm is fully seated in the plain bearing. The elastomer ring is then mounted on the plain bearing. It has proven advantageous to have a form-fitting fit between the elastomer ring and the plain bearing. For example, there can be a circumferential groove in the plain bearing into which the elastomer ring is inserted. A slight preload holds the elastomer ring securely in the circumferential groove of the plain bearing.

[0020] The positive connection between the elastomer ring and the plain bearing can in turn provide assembly security, as on the one hand the correct positioning of the elastomer ring can be ensured and at the same time the elastomer ring is secured against displacement when the screw is mounted in the housing. The screw end mounted in this way, i.e. including the plain bearing and the elastomer ring, is preferably inserted into a bearing recess in the housing. As already explained above, the housing can also have a groove into which the elastomer ring is inserted, so that a definable position of the elastomer ring and thus of the plain bearing in the housing can be achieved or adjusted.

[0021] If the plain bearing can be positioned or held at least partially by means of the housing, this results in a further

[0022] Design variant of the invention. The shaft end of the drive is inserted into a bearing receptacle in the housing, whereby the elastomer ring is elastically deformed and thus provides a damping means or tolerance compensation. A targeted excess size between the elastomer ring and the housing ensures that any tolerances that occur can be compensated for. If, for example, elevations are formed on the housing in the area of ​​the bearing point which extend from the recess in the housing which forms the bearing point in the direction of the shaft end or the plain bearing, these elevations can be used to ensure the positioning of the plain bearing. In other words, incorrect assembly can be prevented. The elevations can extend selectively or circumferentially around the shaft end in the direction of the plain bearing and thus ensure correct positioning of the plain bearing on the shaft end.The elevations can also extend as linear elevations along the recess of the bearing point, so that the plain bearing is continuously guided when the drive or the worm is mounted.

[0023] If a drive motor is equipped with domes, in particular cylindrical domes, the motor can at least be positioned in the housing and held in place during operation by means of the domes. On the one hand, the precise positioning of the drive worm by means of the plain bearing ensures reliable power transmission between the worm and the worm gear, and on the other hand, the domes formed on the motor can ensure reliable positioning of the electric motor in the housing. For this purpose, the motor or the motor housing can have cylindrical domes extending in the axial direction which fit positively into the housing of the actuating unit. For this purpose, the actuating unit can provide a housing in which, on the one hand, the bearing point for the plain bearing is formed and, on the other hand, the electric motor or the housing of the electric motor can be received in a form-fitting manner.The cylindrical domes extend from the housing in the axial direction and to the respective ends of the electric motor, which preferably also extends axially. The positive fit of the domes in the housing enables the motor to be securely seated, so that the torque generated in the motor can be reliably transmitted to the gear or worm via the drive shaft emerging from the motor. Even if a worm drive is preferred here, it is of course also conceivable that, for example, a spur gear is mounted on the gear of the drive shaft. However, a worm drive is preferably used in order to provide an even more advantageous closing aid by means of the actuating unit.

[0024] On the one hand, the motor housing is positioned by the cylindrical domes and the form-fitting holder in the housing, and on the other hand, the electric motor can be further fixed in place by a housing cover. Depending on the design of the housing, the domes can also be accommodated in recesses or grooves in the housing, so that linear guidance can be achieved when the motor is inserted into the housing by means of the domes. The electric motor can be further fixed in place by ribs on the housing cover. The electric motor is therefore held securely and firmly in the housing, so that the torque can be reliably transmitted via the output shaft. The torque is transmitted via the motor's output shaft, for example via a worm to the worm gear. By mounting the plain bearing in the elastomer ring, manufacturing tolerances, for example of the housing and / or the worm drive, can be accommodated.At the same time, misalignment of the screw can be compensated and the worm drive is additionally dampened by the elastomer ring, so that quiet running of the worm drive and thus of the actuating unit can be guaranteed.

[0025] The invention is explained in more detail below with reference to the accompanying drawings using a preferred embodiment. However, the principle applies that the embodiment does not limit the invention, but merely represents one embodiment of the invention. The features illustrated can be implemented individually or in combination with other features of the description and the patent claims.

[0026] It shows :

[0027] Figure 1 is a side view of a section through an actuating unit for automotive applications, showing a section through the electric motor and a worm drive,

[0028] Figure 2 is a detailed view of the screw bearing point from the perspective of section II -II in Figure 1,

[0029] Figure 3 is a detailed view of the bearing point of the screw, showing a section along the line II I- III according to Figure 2, and Figure 4 is a section through the electric drive, the screw and the bearing point along the center line M from Figure 1.

[0030] Figure 1 shows an actuating unit 1 in the partial area of ​​a drive 2 and in section. The actuating unit 1 can, for example, be a closing device for a motor vehicle side door lock. Shown is a drive 2 and a worm gear 4, wherein drive 2, electric motor 3 and worm gear 4 are arranged in a housing 5. The housing 5 is constructed in two parts and comprises a housing shell 6 and a housing cover 7. The drive 2 in the actuating unit 1 is formed by the electric motor 3, the worm 9 and the worm gear 10 on the output shaft 8. According to the invention, a cylindrical extension 11 is received in a plain bearing 12, wherein the plain bearing 12 is received in a bearing point 14 by means of an elastomer ring 13. The bearing of the worm 9 designed according to the invention allows the absorption of tolerances and misalignments and at the same time dampens the noise behavior of the drive 2 .

[0031] The electric motor 3 is, as can be clearly seen in this section, enclosed between the housing parts 6, 7. The motor housing 15 has two cylindrical domes 16, 17 which are enclosed between the housing parts 6, 7 in the housing 5. As a result of the domes in interaction with the housing parts 6, 7, the electric motor 3 is stablely mounted in the axial direction, with additional ribs 18, 19, 20 being provided on the housing parts 6, 7 in order to also achieve radial mounting of the electric motor 3. The housing shells 6, 7 are connected here by means of a screw 21, for example. If the electric motor 3 is energized, the worm 9 is driven by means of the output shaft 8 and the worm gear 10 can be driven as a result of the movement of the worm. The drive movement of the worm gear generates, in addition to the drive power, vibrations which can be absorbed by means of the elastomer ring 13.Preferably, the worm and the worm gear 10 are made of plastic, so that misalignments and / or tolerances in the interaction of the drive as a whole can be compensated for by the elastomer ring 13. The elastic mounting of the shaft end 11 of the worm 9 thus serves, on the one hand, to minimize noise and, on the other hand, to eliminate tolerances and misalignments.

[0032] 1. The housing 6 can be seen, the bearing point 14 being U-shaped in the housing 6. Grooves 24 are formed opposite one another on the parallel lateral extensions 22, 23 of the bearing point 14. The shaft end 11 can be mounted linearly along the line L using the grooves 24. The diametrical arrangement of the grooves 24 in the lateral extensions 22, 23 of the U-shaped bearing point 14 means that the shaft end with the mounted plain bearing 12 and the elastomer ring 13 can be positioned easily and securely in the housing 6. The groove 24 therefore fulfils a dual function. On the one hand, the grooves 24 in the lateral extensions 22, 23 serve as an assembly aid and, on the other hand, the grooves 24 can be used to secure the position of the elastomer ring 13 and consequently the plain bearing 12 in the assembled state.The elastomer ring 13 has an overall tolerance of oversize so that the plain bearing 12 can be held fixed between the elastomer ring 13 and the bearing point 14 by means of a preload. At a lower end 25 of the U-shaped bearing point 14 there is a raised portion 26, the raised portion 26 following the shape of the elastomer ring 13. In other words, the raised portion 26 has a radius which matches the outer diameter of the elastomer ring 13. The raised portion 26 thus follows the shape of the elastomer ring 13. This shape and the interaction of the elastomer ring 13 and the raised portion 26 make it possible to provide a concave base 26 which enables the elastomer ring to rest in a line on the raised portion 26. This has the advantage that even when radial loads occur, only slight deformation of the elastomer ring 13 occurs.

[0033] Figure 3 shows a section along the line II I-III from Figure 2. The bearing point 14 can be seen in a plan view of the worm, the elastomer ring 13, the plain bearing 12 and the shaft end 11. It can be seen that the shaft end 11 is completely received in the plain bearing 12. The elastomer ring 13 is elastically received in the grooves 24, 27. It can also be seen that in this exemplary embodiment a circumferential groove 28 has also been formed in the slide ring 12. The slide ring 12 thus receives the shaft end 11 and is additionally held or positioned in the axial direction along the line M by means of the elastomer ring 13. The slide bearing 12 can also be positioned at least in some areas by means of the housing 6. For this purpose, extensions 29, 30 are formed in the housing 6, which prevent displacement of the plain bearing 12 during assembly and also during operation.The extensions 29, 30 can, however, also come into contact with the plain bearing, at least in some areas, in order to enable guidance of the plain bearing, for example, when inserting the pre-assembled shaft end 11, i.e., with the plain bearing 12 and elastomer ring 13. The inventive design of the bearing point 14 for the shaft end 11 of the worm 9 allows, on the one hand, damping of the drive 2 to be achieved, and, on the other hand, position and shape tolerances as well as misalignment to be compensated.

[0034] Figure 4 shows a section through the drive 2 along the center line M in a plan view of the electric motor 3, the worm 9 and the bearing point 14. The fixing of the electric motor 3 by means of the domes 16, 17 in the housing 6 can be seen. Extensions 31, 32 on the housing 6 can also stabilize the electric motor 3 in the axial direction. This enables the electric motor 3 to be mounted securely and firmly in the housing 5, so that a torque with as little backlash as possible can be transmitted via the output shaft 8 to the worm gear 4 and in particular the worm 9. Tolerances, vibrations and misalignments can be absorbed by the elastomer ring 13.

[0035] List of reference symbols

[0036] Actuator

[0037] drive

[0038] 3 electric motor

[0039] 4 worm gears

[0040] 5 housings

[0041] 6 Housing shell

[0042] 7 Housing cover

[0043] 8 Output shaft

[0044] 9 snail

[0045] 10 Worm gear

[0046] 11 cylindrical extension, shaft end

[0047] 12 plain bearings

[0048] 13 Elastomer ring

[0049] 14 storage location

[0050] 15 Engine housing

[0051] 16, 17 Cathedral

[0052] 18, 19, 20 ribs

[0053] 21 Screw

[0054] 22, 23 lateral extensions

[0055] 24, 27, 28 groove

[0056] 25 lower end

[0057] 26 elevation, ground

[0058] 28, 30, 31, 32 extension

[0059] M center line

[0060] L Line

Claims

Patent claims 1. Actuating unit (1) for automotive applications, in particular a motor vehicle door lock or a locking device, comprising a housing (5, 6, 7) with a drive (2), in particular a worm drive (4), arranged in the housing (5, 6, 7), an actuator which can be acted upon by the drive (2), and at least one plain bearing (12) for receiving a bearing point, in particular a shaft end (11), of the drive (2), in particular a worm (9) of the worm drive (4), wherein the plain bearing (12) is at least partially retained in a plastic, characterized in that the plastic can be designed as an elastomer ring (13).

2. Actuating unit (1) according to claim 1, characterized in that the elastomer ring (13) has a substantially round cross-sectional shape.

3. Actuating unit (1) according to one of claims 1 or 2, characterized in that the elastomer ring (13) can be received at least partially in a form-fitting manner in a bearing point (14) of the housing (5, 6, 7).

4. Actuating unit (1) according to one of claims 2 or 3, characterized in that the positive connection can be formed at least diametrically in the housing (5, 6, 7).

5. Actuating unit (1) according to one of claims 2 to 4, characterized in that the positive connection (24, 27, 28) extends substantially in the joining direction of the drive (2), in particular of the worm (9) in the housing (5, 6, 7).

6. Actuating unit (1) according to one of claims 2 to 5, characterized in that the positive connection (24, 27) can be formed as a groove in the housing (5, 6, 7).

7. Actuating unit (1) according to one of claims 1 to 6, characterized in that by means of the housing (5, 6, 7) a concave support surface (26) for the elastomer ring (13) can be provided at least in some areas.

8. Actuating unit (1) according to one of claims 1 to 7, characterized in that the elastomer ring (13) can be received in the plain bearing (12) in a form-fitting manner, at least in some areas.

9. Actuating unit (1) according to one of claims 1 to 8, characterized in that the sliding bearing (12) is at least partially retained by means of the housing (5, 6, 7).

10. Actuating unit (1) according to one of claims 1 to 9, characterized in that a motor (9) of the drive (2) has domes (16, 17), in particular cylindrical domes (16, 17), and is held in the housing (5, 6, 7) at least by means of the domes (16, 17).

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