Actuating device and method for operating an actuating device and vehicle

Abstract

An actuating device (100) for a vehicle comprises a shaft (105), a drive plate (110), a housing (115), a braking device (120), and a coil (125). The housing (115) comprises a braking section (130), a chamber (135), and a magnetorheological medium (140). The braking device (120) comprises at least one braking element (145) and at least one spring element (150) that exerts a restoring force on the braking element (145) in order to keep the braking element (145) spaced apart from the braking section (130).The coil (125) is designed to generate, depending on an energization of the coil (125), a first magnetic field which sets a first viscosity of the magnetorheological medium (140) and exerts a first magnetic force on the braking element (145) which does not overcome the restoring force, or to generate a second magnetic field which sets a second viscosity of the magnetorheological medium (140) and exerts a second magnetic force on the braking element (145) which overcomes the restoring force in order to press the braking element (145) against the braking section (130).

Description

[0001] The present invention relates to an actuating device, a method and a control device for operating an actuating device and to a vehicle.

[0002] Actuating devices can be installed in vehicles, for example, to allow a passenger to adjust a vehicle function. Some such actuating devices can contain a magnetorheological medium that can be used as a magnetorheological fluid brake. Such actuating devices are known, for example, in the form of a rotary knob from DE 10 2005 003 593 A1 or in the form of torque transmission devices from DE 10 2013 019 045 A1.

[0003] Against this background, the present invention provides an improved actuating device and an improved method for operating an actuating device, as well as an improved vehicle according to the main claims. Advantageous embodiments emerge from the subclaims and the following description.

[0004] The advantages that can be achieved with the approach presented here consist in particular in the creation of an actuating device that can reliably enable braking torques and / or holding torques.

[0005] A corresponding actuating device for a vehicle comprises a shaft, a drive plate, a housing, a braking device, and a coil. The shaft can be coupled to an actuating element, for example a rotary knob. The drive plate is arranged on the shaft in a rotationally fixed manner. The housing has a braking section and a chamber and a magnetorheological medium. The drive plate and the magnetorheological medium are arranged in the chamber. The braking device comprises at least one braking element and at least one spring element. The braking element is coupled to the shaft in a rotationally fixed manner. The spring element is shaped to exert a restoring force on the braking element in order to keep the braking element spaced apart from the braking section. The coil is designed to generate a magnetic field depending on the energization of the coil, which adjusts the viscosity of the magnetorheological medium and exerts a magnetic force on the braking element.A first current intensity of the current supply generates a first magnetic field, which sets a first viscosity of the magnetorheological medium and exerts a first magnetic force on the braking element that does not overcome the restoring force. A second current intensity of the current supply, which is greater than the first current intensity, generates a second magnetic field, which sets a second viscosity of the magnetorheological medium, which is greater than the first viscosity, and exerts a second magnetic force on the braking element that overcomes the restoring force to press the braking element against the braking section.

[0006] The actuating device can be a device for operating any function of the vehicle. The actuating device can be designed as an operating device. For example, such an actuating device can be operated by a vehicle occupant. The shaft can be understood as a movable, rotating part of the actuating device. The housing can be understood as a fixed, immovable part of the actuating device.

[0007] The magnetorheological medium can be a heterogeneous mixture of magnetically polarizable particles, which can also be referred to as a magnetorheological fluid and / or MRF. Alternatively, the magnetorheological medium can also be a powder or grease containing magnetically polarizable particles. By applying a magnetic field, the viscoelastic or dynamic-mechanical properties of the magnetorheological medium can be changed quickly and reversibly.

[0008] Thus, the first magnetic field can cause a state of the magnetorheological medium in which the magnetorheological medium opposes a rotational movement of the shaft with low rotational resistance, i.e., exerts a low braking torque on the shaft and thus on the drive plate and / or the braking element. The second magnetic field can cause a state of the magnetorheological medium in which the magnetorheological medium opposes a rotational movement of the shaft with high rotational resistance, i.e., exerts a high braking torque on the shaft and thus on the drive plate and / or the braking element. Shearing in the magnetorheological medium can decelerate the shaft relative to the housing. High braking torques can be generated.

[0009] The coil can be an electrical component with windings that generate a magnetic field when current flows through it. Advantageously, the magnetic field can be used both to influence the magnetorheological medium and to influence the braking device. The braking device can exert an additional braking torque on the shaft, which acts in addition to the high braking torque generated by the magnetorheological medium. The approach presented here can therefore also be understood as an MRF brake and locking device, enabling an innovative solution for a brake and locking device for small actuators.

[0010] The drive plate can have different shapes. For example, the drive plate can be a flat disc that can be fixed to the shaft with or without a collar. The drive plate can also have a cylindrical wall section, thus being cup-shaped. This allows for different arrangements of the magnetorheological medium and the braking device.

[0011] The first current supplying the coil can have a current of 0.1 amperes to 0.7 amperes, in particular 0.2 amperes to 0.6 amperes. This allows energy consumption to be kept low. The second current supplying the coil can have a current of 0.7 amperes to 1.5 amperes, in particular 0.8 amperes to 1 ampere. This allows the second magnetic force to act reliably on the braking element, allowing the braking element to be reliably pressed against the braking section.

[0012] Optionally, at least one additional current can be used to generate an additional magnetic field, which sets a further viscosity of the magnetorheological medium and exerts an additional magnetic force on the braking element, which, depending on the design, either does not overcome or overcomes the restoring force. In this way, more than two rotary resistors of the actuating device can be set. The actuating device can, for example, be continuously adjustable. This is because the adjustable torque generated by the shear in the magnetorheological medium behaves virtually linearly with the current and can thus be continuously adjusted.

[0013] The spring element can be designed as a disc spring. Disc springs can absorb large forces in a small installation space. Furthermore, disc springs can have a long service life.

[0014] The braking system can be designed as a disc brake, a multi-disk brake, or a bell brake. Thus, suitable braking system designs can be selected depending on the available space and the required braking force. The multi-disk brake can be durable, withstand high loads, and be less susceptible to wear. The braking system can also be designed with a positive fit, allowing it to function as a locking device.

[0015] The braking device can comprise a plurality of braking elements, with the majority of the braking elements being coupled to the shaft in segmented, rotationally fixed fashion. This is suitable, for example, for a bell brake.

[0016] The chamber can be arranged axially or radially to the shaft. The chamber can be partially or completely filled with the magnetorheological medium. The axial or radial arrangement of the chamber relative to the shaft can advantageously influence the functioning of the actuator.

[0017] The drive plate can be arranged on the shaft axially and / or radially to the shaft in a rotationally fixed manner. The drive plate can be designed as a disc. Alternatively, the drive plate can be curved, for example, bent in a U-shape. In this case, one long section of the drive plate can be arranged on the shaft radially to the shaft in a rotationally fixed manner, and two short sections of the drive plate can be arranged on the shaft axially to the shaft in a rotationally fixed manner.

[0018] The coil can be arranged axially or radially offset from the drive plate in the housing. The axial or radial arrangement of the coil relative to the drive plate can advantageously influence the functioning of the actuating device.

[0019] The brake element can be axially or radially coupled to the shaft for non-rotatable movement. The axial or radial arrangement of the brake element relative to the shaft allows for the use of different braking devices.

[0020] The shaft may have a section with an enlarged diameter within the housing. Thus, the shaft may have a cross-shaped cross-section.

[0021] The adjusting device can have at least one shaft seal, which can be arranged on the shaft and can support the drive plate. Additionally or alternatively, the shaft seal can seal the shaft against external influences.

[0022] A vehicle has an embodiment of an actuating device mentioned herein. Thus, the actuating device can advantageously be used in conjunction with a vehicle, for example, as an operating element.

[0023] A method for operating an embodiment of an actuating device mentioned herein comprises a reading step, a providing step, and a further providing step. In the reading step, a braking signal is read in, wherein the braking signal represents a rotational resistance of the actuating device. In the providing step, the current supply with the first current intensity is provided when the braking signal represents a low rotational resistance in order to generate the first magnetic field. This allows the first viscosity to be adjusted and the first magnetic force to be exerted on the braking element. In the further providing step, the current supply with the second current intensity is provided when the braking signal represents a high rotational resistance in order to generate the second magnetic field. This allows the second viscosity to be adjusted and the second magnetic force to be exerted on the braking element.

[0024] The brake signal is provided, for example, by a control unit to set the desired rotational resistance of the actuator. Depending on the level of rotational resistance, the shaft may rotate easily, sluggishly, or not rotate at all.

[0025] Depending on the brake signal read in, either the provision step or the further provision step can be executed. The reading step can be performed repeatedly, allowing the rotational resistance to be continuously readjusted.

[0026] The approach presented here further provides a device configured to perform, control, or implement the steps of a variant of a method presented here in corresponding devices. This embodiment of the invention in the form of a device also allows the problem underlying the invention to be solved quickly and efficiently.

[0027] A device can be an electrical device that processes electrical signals, for example sensor signals, and outputs control signals depending on them. The device can have one or more suitable interfaces, which can be implemented in hardware and / or software. In a hardware implementation, the interfaces can, for example, be part of an integrated circuit in which functions of the device are implemented. The interfaces can also be separate integrated circuits or consist at least partially of discrete components. In a software implementation, the interfaces can be software modules that are present, for example, on a microcontroller alongside other software modules.

[0028] The invention is explained in more detail by way of example with reference to the accompanying drawings. They show: Fig. 1 a schematic representation of an embodiment of an actuating device for a vehicle; Fig. 2 a schematic representation of an embodiment of an actuating device for a vehicle; Fig. 3 a schematic representation of an embodiment of an actuating device for a vehicle; Fig. 4 a schematic representation of an embodiment of an actuating device for a vehicle; Fig. 5 a schematic representation of an embodiment of a vehicle; Fig. 6 a flowchart of an embodiment of a method for operating an actuating device; and Fig. 7 a block diagram of an embodiment of a control device for operating an actuating device.

[0029] In the following description of preferred embodiments of the present invention, the same or similar reference numerals are used for the elements shown in the various figures and having a similar effect, whereby a repeated description of these elements is omitted.

[0030] Fig. 1 shows a schematic representation of an embodiment of an actuating device 100 for a vehicle. More specifically, a sectional view of the actuating device 100 is shown. The actuating device 100 is designed, for example, to operate any vehicle function of the vehicle. For example, the actuating device 100 can be manually actuated by a passenger of the vehicle, for example via an actuating element. For example, a rotary knob can be connected to a free end of a shaft 105 of the actuating device 100 as the actuating element.

[0031] For this purpose, the actuating device 100 has a shaft 105, which can be coupled to the actuating element. Additionally, the actuating device 100 has a drive plate 110, a housing 115, a braking device 120, and an energizable coil 125. The shaft 105 is rotatably mounted relative to the housing 115 and protrudes at least partially from the housing 115, for example, to couple to the actuating element.

[0032] The housing 115 has a braking section 130 and forms a space 135 in which a magnetorheological medium 140 is arranged. According to one exemplary embodiment, the housing 115 forms, in addition to the space 135, a first housing section 142 and a second housing section 144. The space 135 is arranged, merely by way of example, between the first housing section 142 and the second housing section 144. The space 135 and the housing sections 142, 144 are arranged, for example, radially to the shaft 105. The braking section 130 is formed, for example, on an underside of the second housing section 144, merely by way of example as an air gap.

[0033] The magnetorheological medium 140 is arranged in the space 135, wherein the magnetorheological medium 140 is configured to solidify depending on the energization of the coil 125. The drive plate 110 is arranged in a rotationally fixed manner on the shaft 105 and, for example, is aligned radially to the shaft 105, and is also arranged in the space 135. According to one embodiment, the drive plate 110 is surrounded on both sides by the magnetorheological medium 140.

[0034] The braking device 120 has at least one braking element 145 and at least one spring element 150. The braking element 145 is coupled to the shaft 105 in a rotationally fixed manner, for example, radially offset from the shaft 105, wherein the braking element 145 is arranged adjacent to the braking section 130. According to one exemplary embodiment, the braking element 145 is formed from a ferromagnetic material. The spring element 150 is shaped to exert a restoring force on the braking element 145. In this way, the braking element 145 is held at a distance from the braking section 130. According to one exemplary embodiment, the braking element 145 is shaped as a component of a disc brake or a multi-disk brake. The spring element is shaped, for example, as a disc spring.

[0035] The coil 125 is arranged, for example, in the second housing section 144, more precisely axially offset from the drive plate 110. For example, the coil 125 rests with one side directly on an upper side of the second housing section 144.

[0036] Coil 125 is configured to generate a magnetic field depending on the current supplied to coil 125. The generated magnetic field acts on magnetorheological medium 140 and is suitable for adjusting the viscosity of magnetorheological medium 140. Additionally, the magnetic field exerts a magnetic force on braking element 145.

[0037] Coil 125 can be energized with a first current, wherein the first current is merely exemplary between 0.2 amperes and 0.6 amperes, to generate a first magnetic field. The first magnetic field sets a first viscosity of magnetorheological medium 140 and exerts a first magnetic force on braking element 145. The first magnetic force does not overcome the restoring force exerted by spring element 150 on braking element 145. The first magnetic force is thus smaller than the restoring force. As a result, braking device 120 is not activated.

[0038] The coil 125 can additionally or alternatively be supplied with a second current, wherein the second current is greater than the first current and, merely by way of example, comprises 0.8 amperes to 1 ampere, in order to generate a second magnetic field. The second magnetic field sets a second viscosity of the magnetorheological medium 140 and exerts a second magnetic force on the braking element 145. The second magnetic force overcomes the restoring force exerted by the spring element 150 on the braking element 145 in order to press the braking element 145 against the braking section 130. The second magnetic force is thus greater than the restoring force. This activates the braking device 120.

[0039] In other words, Fig. 1 shows the magnetorheological medium 140 with the drive plate 110, which can also be referred to as an MRF brake, in combination with the braking device 120, which according to one embodiment is designed as a multi-disk brake device. According to one embodiment, only one coil 125 is used, and, for example, the MRF brake is actuated first, followed by the braking device 120. This can be achieved by applying electrical currents of varying strengths through the coil 125.

[0040] In order to achieve the largest possible effective diameter of the drive plate 110, which is made of a magnetically conductive material, the coil 125 is positioned axially offset from the drive plate 110 according to one embodiment. The drive plate 110 moves in the space 135 filled with the magnetorheological medium 140. The drive plate 110 is fixedly connected to the non-magnetically conductive shaft 105, which is rotatably mounted in the housing sections 142, 144, which can also be referred to as housing-fixed parts. The housing sections 142, 144 are also made of a magnetically conductive material. The coil 125 is embedded in the second housing section 144, which can also be referred to as the middle housing-fixed part. All parts are surrounded by the non-magnetically conductive housing 115.

[0041] When the coil 125 is flooded with a low to medium current, preferably 0.2 amperes to 0.6 amperes, a magnetic circuit is formed above it, as shown below in Fig. 2. A point 155 in the second housing section 144 is designed such that it enters magnetic saturation simultaneously with the magnetorheological medium 140. When the coil 125 is energized with a higher current, preferably 0.8 amperes to 1 ampere, a correspondingly large force acts on the braking element 145, which can also be referred to as a multi-disk brake disc, such that the spring element 150 integrated in the braking element 145 is overcompressed and the braking section 130, which can also be referred to as an air gap, between the braking element 145 and the second housing section 144 is closed. The braking element 145, like the drive plate 110, is firmly fixed on the shaft 105. The braking force of the braking device 120 is thus added to the braking force of the MRF braking module.

[0042] Such a design has the great advantage that stick-slip-free braking is possible for low to medium braking torques and yet higher braking torques and / or holding torques can be achieved.

[0043] Fig. Figure 2 shows a schematic representation of an embodiment of an actuating device 100 for a vehicle. The actuating device 100 is similar to or corresponds to the actuating device of Fig. 1, except that energization of the coil 125 with the first current intensity is shown.

[0044] The first magnetic field 200 is formed and acts on the magnetorheological medium 140.

[0045] Fig. Figure 3 shows a schematic representation of an embodiment of an actuating device 100 for a vehicle. The actuating device 100 is similar to or corresponds to the actuating device from one of the figures described above, except that the components are arranged differently.

[0046] According to one embodiment, the braking element 145 is formed as part of a bell-type brake. For this purpose, the braking device 120 forms a plurality of braking elements 145, 300, 305, which are arranged, for example, in a segment-like manner around the shaft 105.

[0047] Within the housing 115, the shaft 105 has a section with an enlarged diameter and thus a cross-shaped cross-sectional surface. For example, this section has a greater extension in the radial direction than in the axial direction. The braking elements 145, 300, 305 are arranged in segments, for example, circumferentially around the circumference of this section of the shaft 105.

[0048] The braking device 120 has, for example, a further spring element 310, which is designed to exert a further restoring force on the braking element 145 and / or the braking elements 300, 305 in order to keep the braking element 145 and / or the braking elements 300, 305 spaced apart from the braking section 130. For example, each of the braking elements 145, 300, 305 is assigned a spring element 150, 310.

[0049] The braking section 130 is formed, for example, axially extending between the braking device 120 and the second housing section 144. The second housing section 144 and the space 135 are arranged, for example, axially relative to the shaft 105. The driving plate 110 is, for example, at least partially surrounded by the magnetorheological medium 140, since a section of the driving plate 110 extends radially relative to the shaft 105 and another section of the driving plate 110 extends axially relative to the shaft 105. For example, the cylindrical section of the driving plate 110 extending axially relative to the shaft 105 is surrounded by the magnetorheological medium 140.

[0050] In the radial region, the drive plate 110 is arranged, for example, on an underside of the first housing section 142. The first housing section 142 also extends, for example, both axially to the shaft 105 and radially to the shaft 105.

[0051] The coil 125 is arranged, for example, adjacent to the space 135 in the second housing section 144. For example, the coil 125 is arranged at the level of the section of the shaft 105 in which the shaft 105 has an enlarged diameter.

[0052] In an operational state of the actuating device 100, the coil 125 is energized, for example, with the second current intensity, thereby forming the second magnetic field that adjusts the second viscosity of the magnetorheological medium 140 and exerts the second magnetic force on the braking element 145. The second magnetic force overcomes the restoring force of the spring element 150, thereby pressing the braking element 145 radially against the braking section 130.

[0053] In other words, Fig. 3 shows the actuating device 100, wherein the braking element 145 is designed as a bell-type brake. Here, the space 135, which can also be referred to as an MRF gap, is arranged with the magnetorheological medium 140 in the axial direction of the shaft 105. The braking device 120 is segmented around the circumference and is held on the shaft 105 by the spring elements 150, 310, which act between the segments. If the magnetic flux exceeds saturation in the housing 115, the segments are pulled toward the housing 115 and thus support the shaft 105 on the housing 115.

[0054] Fig. 4 shows a schematic representation of an embodiment of an actuating device 100 for a vehicle. The actuating device 100 is similar to or corresponds to the actuating device from one of the figures described above, with the exception that the actuating device 100 has a shaft seal 400.

[0055] According to one embodiment, the second housing section 144 is arranged on the outside, and the first housing section 142 is arranged at least partially on the inside. The shaft 105 is arranged almost entirely within the housing sections 142, 144, merely by way of example, with only a short section protruding from the second housing section 144, for example, for coupling an actuating element.

[0056] The adjusting device 100 has, for example, the shaft sealing ring 400, which is arranged on the shaft 105.

[0057] The drive plate 110 is arranged in the space 135 between the housing sections 142, 144. The drive plate 110 is at least partially guided through the shaft seal 400 in order to be rotationally coupled to the shaft 105.

[0058] The spool 125 is arranged adjacent to the space 135 and the drive plate 110 in the first housing section 142. The braking device 120 is arranged between the spool 125 and the shaft 105. More specifically, the braking device 120 is arranged on the shaft axially relative to the shaft 105. The braking section 130 is arranged, for example, between the braking element 145 and the first housing section 142.

[0059] In an operational state of the actuating device 100, the coil 125 is energized, for example, with the second current intensity, thereby forming the second magnetic field, and the second magnetic field exerts the second magnetic force on the braking element 145. The second magnetic force overcomes the restoring force of the spring element 150, thereby pressing the braking element 145 axially against the braking section 130.

[0060] According to one embodiment, a clutch, for example in the form of the brake device 120 designed as a multi-disk brake, is displaced in the axial direction within a bell brake in order to close.

[0061] Fig. 5 shows an illustration of an embodiment of a vehicle 500. The vehicle 500 has an actuating device 100. The actuating device 100 is similar to or corresponds to the actuating device from one of the figures described above.

[0062] The actuating device 100 can be operated manually, for example, by an occupant of the vehicle 500, for example by means of an actuating element that can be coupled to the actuating device 100.

[0063] Fig. 6 shows a flowchart of an embodiment of a method 600 for operating an actuating device. The actuating device is similar to or corresponds to the actuating device from one of the figures described above.

[0064] The method 600 comprises a step 605 of reading, a step 610 of providing and a step 615 of further providing.

[0065] In step 605 of reading, a brake signal is read in, which represents a rotational resistance to be set on the actuating device. In step 610 of providing, the current is supplied at the first current intensity if the brake signal represents a low rotational resistance. This generates the first magnetic field using the coil. This results in the first viscosity being set and the first magnetic force being exerted on the brake element. As an alternative to step 610, step 615 of further providing is carried out if the brake signal represents a high rotational resistance. In step 615 of further providing, the current is supplied at the second current intensity to generate the second magnetic field. This sets the second viscosity and exerts the second magnetic force on the brake element.

[0066] According to one embodiment, only step 605 of reading and step 610 of providing are executed, or only step 605 of reading and step 615 of further providing are executed. Alternatively, all steps 605, 610, and 615 of method 600 can be executed repeatedly, with either step 610 or step 615 being executed depending on the type of brake signal.

[0067] Fig. Figure 7 shows a block diagram of an embodiment of a control device 700 for operating an actuating device. The control device 700 is designed, for example, to Fig. 6 or a similar method.

[0068] For this purpose, the control device 700 has a unit 705 for reading, a unit 710 for providing and a unit 715 for further providing.

[0069] The reading unit 705 is configured to read in a braking signal 720. The braking signal 720 represents a rotational resistance and is provided, for example, by a control unit. The providing unit 710 is configured to provide a current having the first current intensity to pass through the coil when the braking signal 720 represents a low rotational resistance.

[0070] The further supply unit 715 is configured to provide a current having the second current intensity when the brake signal 720 represents a high rotational resistance. The units 705, 715 can be implemented, for example, as two separate current sources or as one controllable current source. Reference symbol 100 adjusting device 105 Wave 110 drive plate 115 housings 120 braking device 125 coil 130 braking section 135 Room 140 magnetorheological medium 142 first housing section 144 second housing section 145 brake element 150 spring element 155 positions 200 first magnetic field 300 additional brake element 305 additional brake element 310 additional spring element 400 shaft seal 500 vehicles 600 Method for operating an actuating device 605 Step of reading 610 Step of Deployment 615 Step of further provisioning 700 Control device for operating an actuating device 705 Reading unit 710 Unit for provision 715 Unit for further provision 720 brake signal

Claims

[1] Actuating device (100) for a vehicle (500), wherein the actuating device (100) has the following features: a shaft (105), wherein the shaft (105) can be coupled to an actuating element; a drive plate (110) which is arranged on the shaft (105) in a rotationally fixed manner; a housing (115) with a braking section (130), a space (135) and a magnetorheological medium (140), wherein the drive plate (110) and the magnetorheological medium (140) are arranged in the space (135); a braking device (120) with at least one braking element (145) and with at least one spring element (150), wherein the braking element (145) is coupled to the shaft (105) in a rotationally fixed manner, wherein the spring element (150) is shaped to exert a restoring force on the braking element (145) in order to keep the braking element (145) spaced from the braking section (130); and a coil (125) which is designed to generate a magnetic field depending on a current supply to the coil (125), which adjusts a viscosity of the magnetorheological medium (140) and exerts a magnetic force on the braking element (145), wherein a first current intensity of the current supply generates a first magnetic field (200) which adjusts a first viscosity of the magnetorheological medium (140) and exerts a first magnetic force on the braking element (145) which does not overcome the restoring force, and wherein a second current intensity of the current supply, which is greater than the first current intensity, generates a second magnetic field which sets a second viscosity, which is greater than the first viscosity, of the magnetorheological medium (140) and exerts a second magnetic force on the braking element (145) which overcomes the restoring force in order to press the braking element (145) against the braking section (130). [2] Adjusting device (100) according to claim 1, wherein the spring element (150) is formed as a disc spring. [3] Adjusting device (100) according to one of the preceding claims, wherein the braking device (120) is designed as a disc brake, or a multi-disk brake or a bell brake. [4] Actuating device (100) according to one of the preceding claims, wherein the braking device (120) forms a plurality of braking elements (145; 300, 305), wherein the plurality of braking elements (145; 300, 305) are coupled in segments in a rotationally fixed manner to the shaft (105). [5] Adjusting device (100) according to one of the preceding claims, wherein the space (135) is arranged axially or radially to the shaft (105). [6] Adjusting device (100) according to one of the preceding claims, wherein the drive plate (110) is arranged axially and / or radially to the shaft (105) in a rotationally fixed manner on the shaft (105). [7] Actuating device (100) according to one of the preceding claims, wherein the coil (125) is arranged axially or radially offset from the drive plate (110) in the housing (115). [8] Actuating device (100) according to one of the preceding claims, wherein the braking element (145) is axially and / or radially non-rotatably coupled to the shaft (105). [9] Actuating device (100) according to one of the preceding claims, wherein the shaft (105) has a section with an enlarged diameter within the housing (115). [10] Actuating device (100) according to one of the preceding claims, with at least one shaft sealing ring (400) which is arranged on the shaft (105) and is designed to seal the shaft (105). [11] Vehicle (500) with an actuating device (100) according to one of claims 1 to 10. [12] Method (600) for operating an actuating device (100) according to one of claims 1 to 10, wherein the method (600) comprises the following steps: Reading (605) a brake signal (720), wherein the brake signal (720) represents a rotational resistance of the actuating device (100); Providing (610) the current supply with the first current intensity when the braking signal (720) represents a low rotational resistance in order to generate the first magnetic field (200) in order to adjust the first viscosity and to exert the first magnetic force on the braking element (145); and / or further providing (615) the current supply with the second current intensity when the braking signal represents a high rotational resistance in order to generate the second magnetic field in order to adjust the second viscosity and to exert the second magnetic force on the braking element (145).

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