Actuator drive and method for controlling a brake of an actuator drive

Abstract

The invention relates to a servo drive (1), comprising a component for forming a plug-in transmission (3), wherein the component has at least one driven wheel (5) and at least one insertion element (7, 8, 9, 10), wherein a plug-in transmission (3) with one to five stages can be formed by the component.

Description

Technical Field

[0001] The present invention relates to a servo drive device comprising a motor, for example for adjusting the position of a valve. Preferably, the motor can be a synchronous motor, for example a servo motor. Background Art

[0002] Actuator drives of the type mentioned at the outset are known. Although the speed of a motor of such an actuator drive, for example a synchronous motor, can often be controlled, it has been found that the motor is often not operated in its optimized operating range. Therefore, in the case of previously known actuator drive motors of the type mentioned at the outset, poor efficiency can often occur when changing the speed to be adjusted. Summary of the invention

[0003] The object is therefore to improve the performance characteristics of an actuating drive of the type mentioned in the introduction.

[0004] This object is achieved according to the invention by an actuating drive according to the invention.

[0005] In particular, the invention proposes a servo drive for achieving the above object, which comprises a motor, in particular a synchronous motor, and a plug-in transmission, wherein the motor shaft and the driven wheel of the plug-in transmission are axially adjustable relative to one another, so that at least two different positions can be established. It is thus possible to form a transmission ratio by means of the plug-in transmission, so that the desired rotational speed is established at the driven wheel and / or the driven shaft, preferably when the rotational speed of the motor shaft remains constant and / or when the rotational speed of the motor shaft is in the optimal operating range of the motor. This makes it possible to improve the efficiency of the motor.

[0006] The plug-in transmission can thus be configured to establish different transmission ratios via a component system (multiple stages) consisting of at least a plurality of plug-in elements and / or to establish a direct drive of a driven wheel via a motor shaft (one stage). The invention therefore also relates to a component system for producing a plug-in transmission for a servo drive. The plug-in transmission can preferably be designed as a gear transmission.

[0007] Advantageous embodiments of the invention are described below, which can be combined alone or in combination with features of other embodiments.

[0008] According to a further development, the motor shaft and the driven wheel of the plug-in transmission can be axially adjusted relative to each other. In particular, it is possible to establish at least two different positions by means of the axial adjustment. Thus, a solution is provided by means of which the desired transmission ratio can be established very flexibly and in accordance with the requirements and with little effort by means of the plug-in transmission, so that the required output torque at the driven wheel can be adjusted.

[0009] According to a preferred further development, there can be space between the motor shaft and the driven wheel for at least one insertion element in at least one position. This position can be achieved in particular by the previously described relative adjustment of the axial direction between the motor shaft and the driven wheel. In addition, it is possible to achieve a particularly space-saving arrangement of the transmission member, so that the structural space for the plug-in transmission can be kept as small as possible overall. In addition, the number of required components can be reduced to a minimum. In general, it can be said that by the space that can be established between the motor shaft and the driven wheel, a multi-stage plug-in transmission can be manufactured in a particularly simple manner without the need for structural changes to the basic structure of the servo drive. And it is possible to adapt the use characteristics of the plug-in transmission to the required conditions only by using other components, in particular at least one other insertion element. In particular, insertion elements of different sizes (in particular diameters) can be installed to establish different transmissions.

[0010] According to another advantageous embodiment, the at least one insertion element can be fastened or fastened in the use position on at least one bolt, preferably at least one firmly preassembled bolt. The insertion element can have at least one gear in order to enable a force and torque transmission to a subsequent insertion element and / or to a driven wheel. The bolt can be predetermined for the user by a certain assembly diagram of the plug-in transmission that can be manufactured by the user, if the bolt is firmly preassembled. However, it is also conceivable that the user can freely select the placement of the bolt and / or remove the preassembled bolt. This allows a particularly large flexibility in the establishment of different transmission ratios in order to adjust the desired output torque on the driven wheel.

[0011] In order to achieve the simplest possible and defined placement of the components of the plug-in transmission, the at least one insert element can be fastened or can be fastened in a position in the axial direction of the bolt by means of at least one spacer bushing. This makes it possible for the user to achieve a particularly quick and simple correct alignment of the individual insert elements relative to one another and / or relative to the motor shaft and / or the driven wheel.

[0012] According to a particularly preferred embodiment, it can be provided that at least two insert elements are arranged axially offset from one another. In particular, the two insert elements can have a common screw and / or a common center of rotation or can be arranged laterally offset from one another. As a result, the radial installation space of the plug-in transmission can preferably remain unchanged, with more installation space being required only in the axial direction if necessary. In principle, however, a particularly space-saving arrangement of the transmission element is possible with this solution.

[0013] According to an advantageous further development, two insertion elements, in particular at least three insertion elements, in particular at least four insertion elements, in particular at least five insertion elements can be arranged between the motor shaft and the driven wheel. It is thus possible to create not only a two-stage but a three-stage or more plug-in transmission.

[0014] According to another advantageous further development, it can be provided that at least one insertion element has two gear wheels of different diameters. It can be particularly advantageous here that the at least one insertion element can be fastened in two different orientations. Thus, multiple transmissions can be formed with only one insertion element. When creating a plug-in transmission, the insertion element can thus be simply rotated with the two gear wheels, so that there are two possible orientations. It can be particularly preferred that most or all insertion elements each have two gear wheels of different diameters.

[0015] In order to be able to form a simplified axial relative adjustment between the motor shaft and the driven wheel, it can be provided according to a further development that the meshing area of ​​the motor shaft that is circumferentially circumferential and / or has teeth is configured to be longer in the axial direction than the meshing area of ​​the gear of the at least one insertion element. In particular, the meshing area of ​​the motor shaft can be configured to be longer in the axial direction than the meshing areas of the gears of all insertion elements. Therefore, in this construction form, the structural space required for the transmission can be kept as small as possible, because only the motor shaft has a larger space requirement in the axial direction. Therefore, axial relative adjustment between the motor shaft and the driven wheel is always possible. In addition, in this way, the meshing gears of the insertion element can mesh with the motor shaft axially offset from each other at two different positions, and different force flows for other insertion elements can be achieved in this way.

[0016] According to another advantageous embodiment, the insertion area of ​​the screw can have at least two screw insertion positions, wherein the distance between the screw insertion positions is less than the diameter of the smallest gear, in particular less than the radius of the smallest gear. Not only can the insertion element be inserted variably onto the screw, but the screw position can also be selected in a predetermined manner by the user via one of the screw insertion positions. It is thus possible to reduce the required installation space for forming the plug-in transmission to a minimum, while at the same time always providing a particularly flexible solution, so that different transmission ratios can be established in a simple and less error-prone manner.

[0017] According to an advantageous further development, at least two insert elements can be arranged on at least one bolt. The insert elements can thus be mounted on the bolt directly one after the other or spaced apart from one another in an axially offset manner. This makes it possible to form further stages of the plug-in transmission in a simple and space-saving manner.

[0018] According to another advantageous design, the plug-in transmission can be a transmission that can be specially configured by the user, wherein the user can use a combination of different transmission parts. The combination can have at least one driven wheel and at least one insertion element. Preferably, the combination can have a plurality of insertion elements, which are configured identically or differently. By using identical insertion elements that can preferably be inserted in different orientations, a particularly low-cost production of the combination and / or the plug-in transmission and / or the servo drive can be achieved. The individual components of the plug-in transmission can be manufactured, for example, by injection molding and / or sintering and / or stamping methods. The present invention therefore also relates to the use of the above-mentioned combination for the production of a servo drive and / or for the implementation of a method for the production of a servo drive.

[0019] The invention further relates to an actuating drive comprising a motor and a parking brake, characterized in that the parking brake is arranged on the A-bearing side of the motor. A safety brake in the sense of the invention is understood to be a parking brake which has the purpose of braking a moving mass from motion and / or reliably holding it at rest.

[0020] The parking brake can be a spring pressure brake, for example.

[0021] Parking brakes are known in which the parking brake is arranged on the so-called B-bearing side of a motor, in particular an electric motor. The braking effect on the mass to be braked, in particular the shaft to be braked (driven shaft), therefore takes place indirectly in such parking brakes, since the braking effect acts directly only on the motor shaft. The mass connected to the motor shaft or the shaft to be braked (driven shaft) is therefore not braked directly by the parking brake in previously known solutions.

[0022] The solution described above implements another approach. The parking brake of the servo drive is arranged on the A-bearing side of the motor. The output side of the motor is called the A-bearing side, on which the motor shaft is supported and / or protrudes from the motor housing, in particular by a fixed bracket. In other words, the A-bearing side constitutes the side on which the shaft to be braked (driven shaft) is arranged. The parking brake can therefore be in direct operative connection with the shaft to be braked. If, for example, a break occurs due to material fatigue on the connection between the motor shaft and the driven shaft or other unintentional interruptions in the coupling between the motor shaft and the driven shaft, it is still possible to brake the driven shaft with the solution according to the present invention. This is impossible using a parking brake on the B-bearing side.

[0023] According to an advantageous further development, it can be provided that the output shaft can be placed in operative connection with a functional unit, in particular a valve, or is in operative connection in the use position, so that a force and / or torque transmission from the output shaft to the functional unit is possible.

[0024] In order to establish the safety effect of the parking brake, the parking brake can be braked in the non-energized state and released in the energized state. The braking torque can be generated by a pre-tensioned spring. The parking brake can be released, for example, electromagnetically, hydraulically and / or pneumatically. In a preferred embodiment, the release is electromagnetically. In the energy-free, i.e. non-energized state, the parking brake is closed, thereby ensuring that, in the event of a fault in the parking brake (e.g. on the energy supply), in the event of a fault or in the event of a power failure, the braking torque is maintained and / or suddenly introduced.

[0025] According to another solution, which is independent of or supplementary to the previously described solution, it can be provided that the servo drive has a detection device for determining the rotational speed of a driven shaft, for example the previously described driven shaft, wherein when the detection device reports that a target rotational speed has been reached or fallen below, the parking brake of the servo drive is activated or can be activated by the brake controller.

[0026] The invention further relates to a method for controlling a brake of a servo drive, wherein the driven shaft that can be fixed by the brake is first fixed after the motor-type braking of the driven shaft until the target rotational speed of the driven shaft is reached or falls below. The heat generated by the friction lock on the brake can be reduced in this way. Therefore, before the braking effect is generated by the brake, the braking force of the motor can be used first. Wear can be reduced in this way, so that a particularly durable and low-maintenance servo drive can be formed. In addition, the rotation of the mass to be braked can be used for energy recovery by the motor. Another advantage is that the brake can be designed with significantly smaller dimensions than in previously known servo drives, because the brake is provided for generating a smaller braking torque. Therefore, a more compact construction of the entire servo drive can be achieved overall. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is now further described with the aid of a number of exemplary embodiments, but is not limited thereto. Further exemplary embodiments are obtained by combining single or multiple features with each other and / or with single or multiple features of the respective exemplary embodiments. In the figure:

[0028] Figure 1 A first embodiment variant of the actuating drive according to the invention is shown, wherein primarily a plug-in transmission is shown, which in the embodiment variant shown is designed as a single-stage transmission;

[0029] Figure 2 A second embodiment variant of the actuating drive according to the invention is shown, wherein primarily a plug-in transmission is shown, which in the embodiment variant shown is designed in two stages;

[0030] Figure 3 A third embodiment variant of the actuating drive according to the invention is shown, in which a plug-in transmission is mainly shown, which is designed as a three-stage transmission in the embodiment variant shown;

[0031] Figure 4 A fourth embodiment variant of the actuating drive according to the invention is shown, wherein primarily a plug-in transmission is shown, which in the embodiment variant shown is designed as a four-stage transmission;

[0032] Figure 5 A fifth embodiment variant of the actuating drive according to the invention is shown, wherein primarily a plug-in transmission is shown, which in the embodiment variant shown is designed in five stages;

[0033] Figure 6 A perspective view showing a detailed view of a servo drive comprising a three-stage transmission;

[0034] Figure 7A top view of a plug-in transmission of an embodiment variant of a servo drive is shown, wherein at least a four-stage transmission is shown here;

[0035] Figure 8 A top view of a plug-in transmission of an embodiment variant of a servo drive is shown, wherein at least one three-stage transmission is shown here;

[0036] Fig. 9 A longitudinal sectional view of an embodiment variant of an actuating drive according to the invention is shown, the actuating drive comprising a motor and a parking brake;

[0037] Fig.10 Show Fig. 9 A perspective view of a longitudinal section of a servo drive device in FIG.

[0038] Fig.11 A further view of the previously described actuating drive is shown. Specific implementation plan

[0039] A number of embodiment variants of an actuating drive according to the invention are described below and are each designated as a whole by 1 .

[0040] The actuating drive 1 can be brought into operative connection with a functional unit, in particular a valve, or is in operative connection in a use position.

[0041] The actuating drives 1 each have a motor 2 (electric machine), which can be designed, for example, as a synchronous machine or an asynchronous machine.

[0042] exist Figures 1 to 8 In the embodiment variant of FIG. 1 , the main focus is on the plug-in transmission 3 , which is described in detail below.

[0043] In order to produce a suitable plug-in transmission 3, according to the invention, a modular system comprising a plurality of transmission elements is provided to the user, with which a plug-in transmission adapted to the respective use can be produced quickly and easily. The invention therefore also relates to a use for producing a modular system, as described and claimed here. The modular system will also be discussed in more detail below.

[0044] The motor 2 of the servo drive 1 has a motor shaft 4, through which the torque generated by the motor 2 can be transmitted to the functional unit and / or to the output shaft 33 connected or connectable to the motor shaft 4. Through the above-described operative connection, a force transmission and / or torque transmission from the output shaft 33 to the functional unit is then possible.

[0045] The motor 2 has an A-bearing side 24 and a B-bearing side. The output side of the motor 2, on which the motor shaft 4 is led out of the motor housing and / or to which the functional unit and / or the output shaft 33 are connected, is generally referred to as the A-bearing side 24. The side of the motor housing facing away from the A-bearing side is therefore referred to as the B-bearing side. The B-bearing side is usually designed as the blower side.

[0046] The plug-in transmission 3 of the actuating drive has at least one driven gear 5 which is in operative connection with the motor shaft 4 directly or indirectly, in particular via plug-in elements 7 , 8 , 9 , 10 connected therebetween, ie can be driven in particular directly or indirectly via the motor shaft 4 .

[0047] The motor shaft 4 and the driven wheel 5 can be adjusted relative to each other in the axial direction 19 (in particular with respect to the rotation axis of the motor shaft 4 and / or the driven wheel 5). The adjustment can be performed by changing the position of the motor shaft 4 and / or the driven wheel 5. The driven wheel 5 can also be configured as a driven shaft 33 or coupled to the driven shaft 33.

[0048] By means of the above-described axial relative adjustment, it is possible to provide a space 6 (construction space) between the motor shaft 4 and the driven wheel 5, in which at least one plug-in element 7, 8, 9, 10 can be arranged or is arranged in the use position. Thus, a multi-stage plug-in transmission 3 comprising at least one plug-in element 7, 8, 9, 10 can be or has been created. The axial relative adjustment can be carried out in this case only in such a way that sufficient space 6 is formed so that, depending on the use, the number of plug-in elements 7, 8, 9, 10 can be arranged in the required orientation / orientation, which is required to establish the desired output torque on the driven wheel 5. This makes it possible to achieve a particularly large variability in the adjustment of the desired output torque, because the adjustment of the output torque is not or not necessarily carried out via the motor speed, but via the selected transmission ratio of the plug-in transmission 3. Such a flexibly adjustable actuating drive 1 and / or a component for forming a plug-in transmission 3 in an actuating drive 1 has not been available to date. At the same time, it is possible to keep the required space requirement to a minimum, so that a particularly compact actuating drive 1 can be provided.

[0049] By means of the multiple different transmissions that can be realized via the plug-in transmission 3 , it is possible to set the motor speed to be virtually constant and / or to set it in an optimized operating range in which there is an optimized efficiency of the motor 2 . This makes it possible to reduce heating.

[0050] As in Figure 1 As shown in FIG. 1 , the plug-in transmission 3 can be designed with only one stage, so that the driven gear 5 is driven directly via the motor shaft 4 during operation of the actuating drive 1 , in particular directly meshes.

[0051] exist Figures 2 to 5 1 and 2 show a multi-stage embodiment of a plug-in transmission 3. The number of stages is determined by the number of plug-in elements 7, 8, 9, 10 connected between the motor shaft 4 and the driven gear 5.

[0052] Each insertion element 7, 8, 9, 10 has at least one gear 13, 14. However, it can also be provided that a single or all insertion elements 7, 8, 9, 10 each have a plurality of gears 13, 14 for transmitting torque to other gears and / or to the driven wheel 5. The insertion elements 7, 8, 9, 10 can be arranged or disposed in two different orientations.

[0053] Insertion elements 7, 8, 9, 10 may be as in Figures 1 to 6 As can be seen in the figure, the insert elements 7, 8, 9, 10 are mounted, in particular inserted, or mounted, in particular inserted, on the bolt 11. The axial fixation can be carried out, for example, by form fit and / or friction fit and / or by a spacer sleeve 12 which is also placed on the same bolt 11. The length of the spacer sleeve 12 can thus define the position of the insert elements 7, 8, 9, 10 along the axial direction of the bolt 11.

[0054] The actuating drive 1 can have a plurality of screws 11, on which one or more insert elements 7, 8, 9, 10 can be arranged and / or fastened. The screws 11 can be securely preassembled, for example, on an assembly unit including an introduction region. However, a design is also possible in which the user can freely select the screw introduction position 21 for the individual screws 11.

[0055] The plug-in transmission 3 can be as in Figures 3 to 6 As shown in FIG. 1 , a plurality of insert elements 7, 8, 9, 10 are provided, which are offset from one another in the axial direction 19 and / or are arranged at the same height. The insert elements 7, 8, 9, 10 can be arranged laterally offset from one another. Alternatively or in addition thereto, at least two insert elements 7, 8, 9, 10 can be arranged axially offset on the bolt 11, so that their axes of rotation are identical.

[0056] exist Figures 1 to 8 The embodiment variants shown in FIG. 1 each have an insert element 7, 8, 9, 10 with two gear wheels 13, 14. The two gear wheels 13, 14 of an insert element 7, 8, 9, 10 have different diameters. This has the advantage that such an insert element 7, 8, 9, 10 can be installed in two different orientations, so that different transmissions can be formed. This design also has the advantage that different transmission parts are no longer required to form different transmissions. This can reduce production costs.

[0057] The plug-in transmission 3 can have insert elements 7, 8, 9, 10 which are designed to be identical in structure, as in Figure 4 and 5 In this case, for example, the orientation and / or axial position of the insert elements 7, 8, 9, 10, which are in particular structurally identical, can vary.

[0058] The motor shaft 4 has a meshing region 18 which, in the operating position, is either directly in mesh with the driven gear or in mesh with gears arranged therebetween of the insert elements 7, 8, 9, 10. This makes it possible to transmit torque from the motor shaft 4 to the driven gear 5 and / or the gears 13, 14 of the insert elements 7, 8, 9, 10.

[0059] The meshing region 18 of the motor shaft 4 is designed to be longer in the axial direction 19 than the meshing region 20 of the gearwheels 13, 14 of the insert elements 7, 8, 9, 10. It is thus possible to always bring the motor shaft 4 into engagement with the gearwheels 13, 14 and / or the driven wheel 5 despite the presence of the plug-in transmission 3 and / or an axial adjustment of the motor shaft 4.

[0060] The distance 22 between the screw introduction points 21 is each smaller than the diameter, in particular the radius, of the smallest gear wheel 13, 14 of the insert elements 7, 8, 9, 10. This allows a particularly space-saving arrangement of the transmission element.

[0061] exist Figures 9 to 11 In the embodiment variant of FIG. 2 , the focus is primarily on the actuating drive 1 comprising the motor 2 and the parking brake 23. The parking brake 23 can be designed, for example, as a safety brake, in particular as a spring pressure brake.

[0062] The parking brake 23 has at least two compression springs 28, by means of which a braking force can be generated. The braking torque is generated in the de-energized state of the parking brake 23. The brake 23 is ventilated electromagnetically in the embodiment variant shown.

[0063] The parking brake 23 has the characteristic feature that it is arranged on the A-bearing side 24 of the motor 2 and is in direct operative connection with the output shaft 33 to be braked.

[0064] The output shaft 33 is connected to the motor shaft 4 driven by the motor 2. If the connection between the motor shaft 4 and the output shaft 33 is damaged, the output shaft can still be braked and / or held by means of the parking brake 23. This is not possible in the case of an arrangement of the parking brake 23 on the B-bearing side, since here only an indirect braking / holding of the output shaft 33 can be performed by holding / braking the motor shaft 4.

[0065] In the de-energized state, the compression spring 28 presses the at least one armature 29 against the brake disk 27 and / or the brake disk 27 against the motor flange 34. This results in a friction lock, which generates a braking torque and brakes or holds the output shaft 33.

[0066] In the energized state, in particular when a DC voltage is applied to the field winding 31, a magnetic field is generated, by the magnetic force of which the armature 29 is reset against the spring force of the compression spring 28, thereby generating an air gap 35 between the armature 29 and the brake disk 27 and / or between the brake disk 27 and the motor flange 34. In this state, the brake 23 is referred to as ventilated.

[0067] The brake disk 27 , which is arranged in a rotationally fixed manner on the output shaft 33 , is therefore released in the energized state and can then rotate together with the output shaft 33 .

[0068] If a fault or a power failure occurs, a braking torque is generated directly by the prestressed compression spring 28 or a holding force is transmitted when the output shaft 33 is stationary.

[0069] The servo drive 1 further has a detection device 25 for determining the rotational speed of the driven shaft 33. The parking brake 23 of the servo drive 1 can be configured so that the brake control 26 is activated or can be activated when the detection device 25 reports that the target rotational speed has been reached or fallen below. This has the advantage that when the driven shaft 33 rotates, the driven shaft is first braked by the braking torque generated by the motor 2 before the braking torque generated by the brake 23 acts on the driven shaft 33. Therefore, for complete braking of the driven shaft 33, the parking brake 23 can be designed to be smaller than a conventional brake. In addition, the wear of the brake 23 can be reduced in this way, because the heat generated by the friction lock described above is small.

[0070] That is, the present invention relates in particular to a servo drive 1, which includes a component for forming a plug-in transmission 3, wherein the component has at least one driven wheel 5 and at least one insertion element 7, 8, 9, 10, wherein a plug-in transmission 3 including one to five stages can be formed by the component, as described and claimed herein.

[0071] Reference numerals list

[0072] 1Servo drive

[0073] 2 Motor

[0074] 3Plug-in transmission

[0075] 4 motor axes

[0076] 5 driven wheel

[0077] 6 Space between the motor shaft and the driven wheel, structural space in the axial direction

[0078] 7 First insertion element

[0079] 8 Second insertion element

[0080] 9Third insertion element

[0081] 10 Fourth insertion element

[0082] 11 Bolt

[0083] 12 Spacer bushing

[0084] 13 First Gear

[0085] 14 Second gear

[0086] 15 Diameter of the first gear

[0087] 16 Diameter of the second gear

[0088] 17 teeth

[0089] 18 Motor shaft engagement area

[0090] 19 Axial direction

[0091] 20 Insert element meshing area of ​​the gear

[0092] 21 Bolt introduction position

[0093] 22 Distance between two adjacent bolt lead-in positions

[0094] 23 Parking brake

[0095] 24 A bearing side

[0096] 25 Detection Devices

[0097] 26 Brake controller

[0098] 27 Brake disc

[0099] 28 Compression spring

[0100] 29 Armature

[0101] 30 Return spring

[0102] 31 Field winding

[0103] 32 Shell

[0104] 33 Driven shaft

[0105] 34 Motor flange

[0106] 35 Air Gap

[0107] 36 Magnet housing

Claims

1. A servo drive device (1), comprising: - a motor (2) including a motor shaft (4) and - a plug-in transmission (3) comprising a driven wheel (5), It is characterized in that - the motor shaft (4) and the driven wheel (5) of the plug-in transmission (3) are axially adjustable relative to one another, so that at least two different positions can be established thereby, - by axially adjusting the motor shaft and the driven wheel relative to each other, a space is created between the motor shaft (4) and the driven wheel (5) for arranging at least one insertion element, - the at least one insertion element has at least one gear wheel, so that the driven wheel (5) can be indirectly and intermediately connected to the motor shaft (4) via the at least one insertion element, - The desired transmission ratio can thus be established as required by means of the plug-in transmission (3) in order to adjust the required output torque at the driven wheel.

2. The servo drive (1) according to claim 1, wherein: The motor (2) is a synchronous motor.

3. The servo drive device (1) according to claim 1, wherein: The at least one insert element can be fastened to at least one screw (11), or the at least one insert element is fastened in the use position.

4. The servo drive (1) according to claim 3, wherein: The bolt (11) is a securely preassembled bolt.

5. The servo drive (1) according to claim 3, wherein: The at least one insert element is fastened or can be fastened in a position in the axial direction of the bolt (11) by means of at least one spacer bushing (12).

6. The servo drive (1) according to claim 5, wherein: At least two insert elements are arranged axially offset with respect to one another.

7. The actuating drive (1) according to any one of claims 1 to 6, wherein: Two insertion elements are arranged between the motor shaft (4) and the driven wheel (5).

8. The actuating drive (1) according to any one of claims 1 to 6, wherein: At least three insertion elements are arranged between the motor shaft (4) and the driven wheel (5).

9. The actuating drive (1) according to any one of claims 1 to 6, wherein: At least four insertion elements are arranged between the motor shaft (4) and the driven wheel (5).

10. The actuating drive (1) according to any one of claims 1 to 6, wherein: At least five insertion elements are arranged between the motor shaft (4) and the driven wheel (5).

11. The actuating drive (1) according to any one of claims 1 to 6, wherein: The at least one insert element has two gear wheels of different diameters.

12. The servo drive (1) according to claim 11, wherein: The at least one insert element can be fastened in two different orientations.

13. The servo drive (1) according to claim 11, wherein: The toothing region of the motor shaft (4) which circumferentially circumferentially and / or has teeth (17) is designed to be longer in the axial direction (19) than the toothing region of the gearwheel of the at least one insertion element.

14. The servo drive (1) according to claim 13, wherein: The meshing region of the motor shaft (4) is designed to be longer in the axial direction (19) than the meshing regions of the gearwheels of all the inserted elements.

15. Actuator drive (1) according to any one of claims 3 to 6, wherein: The introduction region of the screw (11) has at least two screw introduction locations (21), wherein the distance (22) between the screw introduction locations (21) is smaller than the diameter of the smallest gear wheel.

16. The servo drive (1) according to claim 15, wherein: The distance (22) between the bolt introduction positions (21) is smaller than the diameter of the smallest gear and smaller than the radius of the smallest gear.

17. Actuator drive (1) according to any one of claims 3 to 6, wherein: At least two insertion elements are arranged on at least one bolt (11).

18. Actuator drive (1) according to any one of claims 1 to 6, wherein: The servo drive device (1) comprises a motor (2) and a parking brake (23), wherein the parking brake (23) is arranged on the A-bearing side (24) of the motor (2), and is characterized in that: The parking brake (23) has at least two compression springs (28) by means of which a braking force can be generated, whereby a braking torque is generated in a de-energized state of the parking brake (23) and the parking brake can be electromagnetically released.

19. The servo drive (1) according to claim 18, wherein: The output shaft (33) can be placed in operative connection with the functional unit on the A-bearing side (24) or is in operative connection in the use position, so that a force and / or torque transmission from the output shaft (33) to the functional unit is possible.

20. The servo drive (1) according to claim 19, wherein: The output shaft (33) can be placed in operative connection with a valve on the A-bearing side (24).

21. The servo drive (1) according to claim 18, wherein: The parking brake (23) is engaged in a non-energized state and is released in an energized state.

22. Actuator drive (1) according to any one of claims 1 to 6, wherein: The servo drive (1) comprises a motor (2) and a parking brake (23), characterized in that the servo drive (1) has a detection device (25) for determining the rotational speed of a driven shaft (33), wherein the parking brake (23) of the servo drive (1) is activated or can be activated by a brake controller (26) when the detection device (25) reports that a target rotational speed has been reached or fallen below.

23. Method for actuating a parking brake (23) of an actuating drive (1) according to one of claims 1 to 22, characterized in that The driven shaft (33) that can be fixed by the parking brake (23) is fixed only after the driven shaft (33) is motor-braked until the target rotational speed of the driven shaft (33) is reached or falls below.

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