DE102020126971B4 - Haptic operating device with a magnetorheological braking device - Google Patents

Abstract

Haptic operating device (100) with a magnetorheological braking device (1) with a fixed holder (4) and with two braking components (2, 3). One of the two brake components (2, 3) is non-rotatably connected to the holder (4). The two brake components (2, 3) can be continuously rotated relative to one another about an axis of rotation (20). A first brake component (2) extends along the axis of rotation (20) and comprises a core (21) made of a magnetically conductive material. The second brake component (3) comprises a hollow shell part (13) extending around the first brake component (2). Between the first and the second brake component (2, 3) there is a circumferential gap (5) which is at least partially filled with a magnetorheological medium (6). An electrical coil (26) wound around the axis of rotation (20) and surrounding the core (21) is accommodated between the casing part (13) and the core (21). The gap (5) comprises two radial and differently designed brake gap sections (5a, 5b), with a disc contour (41) being formed between the casing part (13) and the core (21) on a first brake gap section (5a), and with in one second brake gap section (5b) a plurality of rolling elements (11) is arranged as magnetic field concentrators on the circumference of the core (21).

Description

The invention relates to a haptic operating device and in particular a haptic operating button with a magnetorheological braking device with a fixed holder and with at least two braking components which can be rotated continuously relative to one another about an axis of rotation.

The haptic control device can be used in particular when operating technical equipment in motor vehicles and other vehicles, for example as a turntable, rotary/push button, for infotainment, air conditioning (temperature, ventilation level, distribution), as a gear selector switch, for navigation, in cruise control, in distance control, as seat adjustment, in the steering or in the steering wheel, in chassis adjustment, in driving mode adjustment, for windscreen wiper adjustment, for window adjustment or sunroof adjustment, for parking assistants or for setting (partly) autonomous driving or even as a steering wheel replacement.

It can be used in motor vehicles, aircraft, airplanes, ships, boats, in agricultural engineering, for example in tractors or combine harvesters, harvesters and other field machines for agriculture. It can also be used in construction machinery and, for example, forklifts or similar machines or in medical or industrial systems.

The invention can also be used in the operation or as an input device of washing machines, kitchen appliances and household appliances, radios, cameras and film cameras, hi-fi and television systems, smart devices, smart home devices, laptops, PCs, smartwatches, in a crown wheel of wristwatches or used as a computer mouse or as a wheel in a computer mouse, on game consoles, in gaming equipment, as a knob in a keyboard or on other devices.

With the DE 10 2004 041 690 A1 an electrical switch has become known which has an actuating member which interacts with an actuating means. The movement means is operatively connected to a magneto- and/or electrorheological device, so that a changeable feel can be generated for the adjustment movement of the actuating member. The device includes stator discs and rotor discs and a magnetorheological or electrorheological fluid therebetween.

Magnetorheological fluids have, for example, very fine ferromagnetic particles, such as carbonyl iron powder, distributed in an oil. In magnetorheological fluids, approximately round or spherical particles with a manufacturing-related diameter of 1 μm to 10 μm are used, with the particle size and particle shape not being uniform. If such a magnetorheological fluid is subjected to a magnetic field, the carbonyl iron particles of the magnetorheological fluid or the magnetorheological medium or the magnetorheological fluid link up along the magnetic field lines, so that the rheological properties of the magnetorheological medium are significantly influenced depending on the shape and strength of the magnetic field (transmissible shear stresses ).

With the WO 2012/034697 A1 a magnetorheological transmission device has become known which has two components which can be coupled and whose coupling intensity can be influenced. A channel with a magnetorheological medium is provided to influence the coupling intensity. The magnetorheological medium in the channel is influenced by a magnetic field. Rotating bodies are provided in the channel, on which acute-angled areas containing the magnetorheological medium are provided. The channel or at least part of it can be subjected to the magnetic field of a magnetic field generating device in order to selectively (magnetically) concatenate the particles and to wedge them with the rotating bodies or to release them. This magnetorheological transmission device can also be used on a rotary knob to operate technical devices. Such a magnetorheological transmission device works and allows the transmission of very high forces or torques with a relatively small design or volume at the same time.

In the WO 2012/034697 A1 also discloses a rotary knob or control knob in which the actual knob is rotatably mounted about a shaft. The braking torque can be controlled via the magnetic field generated by an electric coil. If an even higher braking torque that can be generated is desired, cylindrical rollers can also be used instead of spherical rotating bodies, so that the magnetic field acts over a longer distance or larger area (magnetic field concentration and wedge formation takes place over a larger area). A haptic control device with such rotary bodies or rolling bodies allows a satisfactory function and a very high torque for a haptic control button, while at the same time there is a low braking torque when the magnetic field is switched off. The ratio of maximum torque that can be generated ment to minimum torque (basic torque) is high.

The disadvantage, however, is that the high maximum torque can only be achieved at low speeds of the haptic operating device. If the speed exceeds a value that depends on the respective design, the maximum torque drops considerably and does not always meet the requirements.

It is therefore the object of the present invention to provide a haptic operating device and in particular a haptic operating button with a magnetorheological braking device, with which a low basic torque and a relatively high maximum torque can be generated at different speeds.

This object is achieved by a haptic operating device with the features of claim 1. Preferred developments of the invention are the subject matter of the dependent claims. Further advantages and features of the present invention result from the general description and from the description of the exemplary embodiments.

A haptic operating device according to the invention can be designed in particular as a haptic operating button. The haptic operating device has at least one magnetorheological braking device with a stationary holder and with at least two braking components. One of the two brake components is non-rotatably connected to the holder. The two brake components are continuously rotatable relative to each other about a (common) axis of rotation. A first braking component extends along the axis of rotation (in the axial direction) and includes a core of magnetically conductive material. The second brake component includes a hollow shell portion extending around the first brake component. A circumferential gap that is at least partially filled with a magnetorheological medium is formed between the first and the second brake component. At least one electrical coil wound around the axis of rotation and (radially) surrounding the core is accommodated between the casing part and the core. The gap comprises at least two (functionally) different and radially designed brake gap sections. A disc contour is formed between the casing part and the core at a first braking gap section. In a second braking gap section, a plurality of rolling elements are arranged on the circumference of the core.

The haptic operating device according to the invention has many advantages. A significant advantage of the haptic operating device according to the invention is that it includes two functionally different brake gap sections that are each formed in the radial direction. As a result, the haptic operating device can be braked in different ways at different speeds. While one of the brake gap sections (functionally related) generates a higher torque at lower speeds, the other brake gap section generates a relatively high torque even at higher speeds due to the different structure. As a result, a constant maximum torque is achieved over the entire speed range, which is very advantageous in many applications.

The haptic control device according to the invention has a simple structure, uses only a few parts and allows easy and inexpensive production. The basic friction is low and a high maximum torque can be provided for different speeds and also at standstill. Manufacturing is simple and inexpensive.

The first braking component defines an axial direction. In particular, an axis of symmetry of the first braking component is the axis of rotation. Preferably, the core of the first brake component extends in the axial direction, but may also have a slight angle to the axial direction.

The invention makes it possible to generate a high braking torque at different speeds in a small space. The magnetic field passes through the two different brake gap sections between the core and the casing part, each essentially radially or at least transversely to the axis of rotation.

The rolling elements serve in particular as magnetic field concentrators. Due to the rolling elements (serving as magnetic field concentrators) there can be acute angles between the individual magnetic field lines and the radial orientation, but generally or on average the magnetic field is essentially radial. The same also applies to the other brake gap section with the disk contour, in which a three-dimensional alignment of the magnetic field lines can also result at the radial end of the disk contour, but which are again essentially radially aligned on average or overall.

In particular, in an axial region (directly) adjacent to the electric coil, a disk contour or disk body is formed between the shell part and the core, and in an (another) axial section (directly) adjacent to the electric coil is a plurality of Rolling elements (as magnetic field concentrators) arranged on the circumference of the core.

In particular, the rolling elements are arranged in a common plane transversely or perpendicularly to the axis of rotation. Preferably, the rolling elements can move completely around the core. An outer surface of the core is preferably cylindrical in the second braking gap portion.

A radius or (typical or maximum) diameter of the first brake gap section is preferably approximately and in particular exactly the same size as a radius or (typical or maximum) diameter of the second brake gap section. This means that large torques can be generated even at higher speeds and when starting from a standstill.

The magnetorheological medium particularly wets the first and the second brake component at least in sections.

The (at least one) electrical coil is preferably wound around the axis of rotation and generates a magnetic field in an axial direction substantially within the core. The electrical coil is accommodated radially between the core and the casing part. The electrical coil can be wound around the core or attached to the inside of the casing part.

The core consists of a magnetically (well) conductive material. The first braking component comprises the core and in particular an axle or a shaft which in particular consists at least partially or completely of a magnetically non-conductive material. Preferably, the axle (the shaft) and the core are detachably connected to each other.

The disc contour consists at least partially or completely of a magnetically (well) conductive material.

In a preferred development, the disk contour is designed as a separate disk body. It is also possible that the disk contour is formed in one piece with the core and z. B. T-shaped, with the long leg of the “T” running along the axis of rotation. It is also possible that a part of the disk contour is designed in one piece with the core and is supplemented by a separate disk body. In simple and particularly preferred configurations, the disk contour is formed by a separate disk body that is attached to or on the core.

The disk body is preferably applied to the core. For this purpose, the core has, in particular, an adapted receptacle. It is possible and preferred, for example, for the disc body to be connected or pressed onto the core. However, it is also possible for the disk contour or the disk body to be connected to the casing part and, for example, to be pressed into it. It is also conceivable that two disk bodies adapted to one another are used, between which a radial brake gap section is formed. A first hollow-cylindrical disk contour can be applied to the core and a second hollow-cylindrical disk contour with a correspondingly large inner diameter can be introduced into the casing part, so that the two disk contours are aligned with one another in the axial direction, for example, and leave a small (radial) gap between them. Between the two disk contours then remains a brake gap section that is in particular designed essentially radially.

In particularly preferred configurations, the pane contour has at least one pane pack. The pack of disks is formed in particular by a plurality of sheet metal disks that preferably lie directly against one another. Such a configuration enables, for example, the production of the sheet metal discs as a stamped part. Punched parts can be produced particularly easily and inexpensively in large numbers. If they are stacked on top of one another and, for example, pressed together, a disk package or a disk body with a significantly greater thickness can be provided easily and inexpensively. As a result, sheet metal panes and also pane packs can be produced very cost-effectively.

It is preferred that at least some sheet metal disks or almost all sheet metal disks or all sheet metal disks are each round and have the same diameter or at least similar diameters. However, it is also possible to use a few or individual non-round disc plates on which, for example, a non-round outer contour or a toothed structure or star contour is formed radially on the outside. If circular and non-circular disk sheets are stacked to form a disk pack, a complex outer contour can be created, which can locally lead to a greater magnetic field concentration. It is also possible for a disk pack to include a plurality of round (or non-round) disk sheets with different outside diameters. In this way, round sheet metal plates with a smaller and a larger diameter can be provided alternately.

In particularly preferred configurations, the disc contour has a cylindrical outer contour overall.

It is possible and preferred for the disk contour to have an (axially) outwardly protruding outer contour on at least one axial side. The disk contour can be conical, bulbous, rounded or stepped overall. In particular, the disc contour is rotationally symmetrical in the area of the outer contour. The outwardly projecting outer contour can, for example, be supported on a cover or the like or be guided there. The outwardly protruding outer contour thereby makes it possible to provide a reservoir of magnetorheological particles.

In all configurations, it is preferred that a radial free space for a rolling body between the shell part and the core in the second brake gap section is larger than a gap height in the first brake gap section (in the area of the disc contour). A radial free space results from the difference in the gap height in the second brake gap section minus the diameter of the rolling element. The radial free space is typically divided approximately equally radially outside of the rolling body and radially inside of the rolling body. In simple cases, the rolling body is arranged radially centrally and the radial distance between the outer surface of the rolling body and the inner surface of the shell part and the radial distance from the outer peripheral surface of the core to the radially inner outer surface of the rolling body are approximately the same.

The radial free space (total) for a rolling body in the second brake gap section is preferably more than twice and in particular at least three times as large as the gap height in the first brake gap section. This means that in the normal case, the rolling element has more play radially outwards and radially inwards than the gap height on the disk body in the first braking gap section. It is also possible and preferred that the radial free space for a rolling body in the second brake gap section is four times or even greater than the gap height in the first brake gap section. A gap height at the braking gap section on the disc contour is preferably less than 0.15 mm and preferably less than 0.1 mm.

Preferably, the radial clearance in the second brake gap section and the gap height in the first brake gap section on the disc contour are (considerably) smaller than a radial distance in other areas of the gap. The radial distance from the outer diameter of the electrical coil or from the outer diameter of a coating over the electrical coil or an extrusion coating of the electrical coil to the radial inner wall of the casing part is (axially) outside of the two brake gap sections preferably (considerably) larger than in the two brake gap sections. The difference in size can reach and far exceed a factor of 2 or 3.

In specific configurations, the radial clearance for a rolling element in the second brake gap section is approximately 0.2 mm, while the gap height in the first brake gap section is approximately 0.05 mm. Deviations of +/- 50% are possible in each case. Overall, the radial play on a haptic control button in the area of the rolling bodies is twice the radial free space, since rolling bodies are arranged on opposite sides of the core, a total of 0.4 mm in this example. In the area of the first brake gap section with a gap height of 0.05 mm, there is a total radial play of 2×0.05 mm, ie 0.1 mm.

Because of this very small amount of play, in many cases a separate bearing can be dispensed with, at least at the end of the haptic operating device with the disk contour. The disk contour then, together with the shell part, takes over the guidance or bearing of the shell part relative to the core. This enables an even simpler and more cost-effective construction.

In particularly preferred configurations, the first and second braking gap sections are formed on different axial sides of the electrical coil. Particularly preferably, at least one braking gap section is axially directly or indirectly adjacent to the electric coil.

An axial width of the rolling bodies is preferably between half and twice the axial width of the disk contour. This allows a particularly effective transmission of the magnetic field in the braking gap section of the disc contour, which also enables a high magnetic field concentration at the second braking gap section in the area of the rolling elements. As a result, the braking effect in the first brake gap section and the second brake gap section is increased, while the overall axial length remains small.

A ratio of an axial width of the rolling elements to an axial width of the electrical coil is preferably between 1:5 and 3:1 and in preferred configurations between 2:3 and 3:2.

A ratio of an axial width of the disk contour to an axial width of the electrical coil is preferably between 1:5 and 3:2 and in preferred embodiments between 2:3 and 3:2. Here, the axial width of the disk contour is understood to mean the width of the disk contour at the brake gap section. If the disk contour tapers radially outwards, for example, and the axial width of the disk contour decreases radially outwards, this is understood to mean the axial width of the disk contour in the vicinity of the radially outer end.

In all configurations, it is particularly preferred that the magnetic field of the magnetic circuit passes at least partly axially through the core and the casing part and to a considerable extent radially and particularly preferably essentially radially through the first and the second brake gap section. In simple configurations, the electrical coil is wound around the core and generates a magnetic field in the axial direction of the axis of rotation within the core, which is conducted radially outwards at the respective ends of the electrical coil and at one axial end through the disk contour and the first brake gap section and at the other axial end passes through the second brake gap section and the rolling elements from the core into the shell part and vice versa. Such a configuration allows a particularly simple, inexpensive and yet effective construction.

Preferably, the rolling bodies consist at least partially and in particular almost completely or completely of a magnetically conductive material.

Magnetic non-conductive bodies or rolling elements can also be present. Non-conductive bodies can serve as placeholders or guide elements and can have any shape. Thus, magnetically non-conductive bodies can be arranged between the (magnetically conductive) rolling bodies. Several non-conductive bodies (e.g. guide elements) can be connected to one another, e.g. in the form of a cage. This makes assembly easier.

The disk contour particularly preferably guides the casing part in a rotatable manner and serves as a bearing point.

A closed chamber is preferably formed between the brake components. In particular, the closed chamber is at least to a significant extent and in particular essentially filled with a magnetorheological medium such as a magnetorheological fluid and/or z. B. (dry or powdered) carbonyl iron powder filled. In particular, the second brake component is rotatably accommodated on the first brake component.

The first braking component preferably includes an axle formed at least in part from a non-magnetically conductive material. The core made of a magnetically conductive material is attached to the axle.

The second brake component is preferably accommodated in an axially displaceable manner on the first brake component. This can (also) serve, for example, to enable volume equalization in the event of temperature changes and/or in the event of a leak. It is preferred that a radial and/or axial position of the two brake components relative to one another is detected by sensors.

In all of the configurations, it is preferred that a click element is arranged at one and in particular at the distal end of the chamber. Such a click element allows in particular two states, after pressing the click element z. B. switches over a metal sheet in an audible and/or tactile manner and thereby performs a (small) axial displacement. Such z. B. designed as snap parts or snap disks click elements are known for example from keyboards or other devices and allow an inexpensive and effective tactile feedback when pressing a button or the like.

The click element is preferably arranged at one end of the chamber. An elastic membrane particularly preferably separates the chamber from the click element. The click element can be designed as a snap part or snap disk. This can provide volume compensation to the chamber as the axle continues to enter or exit the chamber.

In particularly preferred developments, the snap-action disk is designed such that a change in the spanned volume of the snap-action disk between the two states of the snap-action disk is adapted to a cross-sectional area of the axis multiplied by an axial offset of the snap-action disk when actuated. In particular, the two volumes differ by less than 50% or 25% and preferably by less than 10% or less than 5%. Such a configuration, in which the snap-action disk is adapted to the axis, ensures that only a small volume or possibly no volume at all has to be provided for volume compensation when the snap-action disk is actuated.

The use of a click element or snap part at the distal end of the chamber in connection with the formation of the first brake gap section with the disc contour also close to the distal end of the chamber enables particularly simple and effective guidance and Storage of the shell part, since there is only a small amount of radial play and the disk contour can therefore (in many cases) assume sufficient guidance in the radial direction of the shell part.

In preferred developments, a sensor device or at least one sensor device for detecting a relative angle of rotation between the core and the casing part is included.

A sensor device or at least one sensor device for detecting a relative axial position of the casing part in relation to the core is preferably included. Particularly preferably, the sensor device or at least one sensor device comprises at least one magnetic field sensor, which is designed to detect a rotation angle and an axial position. In particularly advantageous configurations, the sensor device includes at least one Hall sensor.

In simple, preferred configurations, the magnetic field sensor is accommodated on the stationary brake component and is exposed to a magnetic field acting in the radial direction. A rotation angle can also be determined via the orientation of the magnetic field sensor relative to the magnetic field. An axial displacement of the sensor device relative to the casing part can be derived from an intensity of the magnetic field strength.

At least one shielding device for at least partially shielding the sensor device from a magnetic field of the electrical coil is particularly preferably included. The shielding device preferably comprises at least one shielding body. The shielding body is designed in particular to shield a magnetic ring unit for applying a defined (eg radial) magnetic field to the magnetic field sensor from interfering magnetic influences of the electric coil. For this purpose, the shielding body preferably gives at least sections of the magnetic ring unit. The shielding device preferably surrounds the magnetic ring unit on three sides, namely on both axial sides and radially outwards. The shielding device preferably comprises at least one separating unit arranged between the shielding body and the magnetic ring unit. As a result, the magnetic field of the magnetic ring unit is decoupled from the shielding body. Furthermore, at least one magnetic decoupling device arranged between the shielding body and the casing part is preferably included. The separating unit and/or the decoupling device preferably have a magnetic conductivity that is many times lower than that of the shielding body. The shielding device and the magnetic ring unit are preferably arranged at a distance from one another.

A shielding device enables a significant improvement in the measurement quality. In particular, fine angular resolutions and small axial distances can be detected as a result.

In all configurations, it is preferred that a rotary knob or a rotary wheel is formed on the casing part. The knob can be formed by a kind of coating.

At least one light source is preferably included for illuminating an at least partially transparent rotary knob.

A device component according to the invention comprises a haptic operating device, as described above. It is also possible that two or more haptic operating devices are included. Such a device component can include a user interface, a control panel, a display, a touch-sensitive display with or without haptic feedback and/or at least one sensor or other input and output options.

In particular, the user interface can (also) be loaded by inductive coupling. Since the outer brake component, to which the rotary knob and thus also the user interface are attached in particular, can be rotated, cables for the electrical connection to the outer distal end cannot easily be routed up. Contacting via sliding contacts is possible, but increases the basic torque and is therefore not particularly preferred.

In the area of the LEDs, an electrical coil can be attached for an inductive coupling, which can be used both for energy transmission and for data transmission. In this way, the required electrical energy and the data for the display can be transmitted inductively to the user interface. Data coupling is also possible using other wireless methods.

The magnetic coil is preferably controlled mostly or predominantly during the operating time with a voltage of in particular 12V. In terms of haptics, it is (often) of considerable advantage if the braking torque of the magnetorheological braking device reaches the maximum or set value as quickly as possible. This is sometimes only possible with a greater voltage. A maximum braking torque is generally achieved by a maximum magnetic field in the braking gap. Since the magnetic field is generated by the current in the electric coil (solenoid), Therefore, the current must also be set to the maximum value as quickly as possible. In principle, you can always set the voltage to a high value, in this specific case instead of e.g. B. 12V to z. B. 24V. For this, however, all components (electrical coil or magnetic coil, the coil wire, etc.) would have to be designed differently (and, for example, a wire with a larger diameter would have to be used).

Therefore, in preferred refinements and developments, a higher voltage is set only at the beginning of a haptic feedback. A higher voltage is preferably set for a period of between 0.5 ms and 50 ms, preferably in a period of between 1 ms and 10 ms, particularly at the beginning or almost immediately after a haptic feedback. The higher voltage is maintained until the current (or magnetic field) reaches the desired maximum value and/or the amount of time that the higher voltage can act is reached or exceeded. Thereafter, the voltage to the lower voltage of z. B. regulated back 12V. The system reacts more quickly and the desired braking torque can be set more quickly.

The use according to the invention claims the use of a haptic operating device with a braking device in order to generate a high braking torque over a larger speed range, the braking device comprising at least two different radially designed braking gap sections. A disk contour is formed between the shell part and the core at a first braking gap section in order to generate a high braking torque at higher speeds. In a second braking gap section, a plurality of rolling elements are arranged on the circumference of the core in order to generate a high braking torque at lower speeds. In particular, the embodiment or development of a haptic operating device or a device component is used for use, as described above or disclosed in the context of the following exemplary embodiments.

Further advantages and features of the present invention result from the exemplary embodiments, which are explained below with reference to the enclosed figures.

• 1a-1b schematische dreidimensionale Ansichten von haptischen Bedieneinrichtungen mit einer magnetorheologischen Bremseinrichtung;
• 2 eine Seitenansicht einer haptischen Bedieneinrichtung mit einer magnetorheologischen Bremseinrichtung;
• 3a-3c verschiedene Schnitte von haptischen Bedieneinrichtungen;
• 4a-4b eine stark schematische Ansicht einer Sensoreinrichtung und von Messergebnissen;
• 5 eine stark schematische Ansicht einer haptischen Bedieneinrichtung mit einer Schnappscheibe in unterschiedlichen Stellungen;
• 6-8 weitere haptischen Bedieneinrichtungen im Schnitt; und
• 9 eine stark schematische Schaltung zur Ansteuerung der elektrischen Spule.

Show in it:

• 1a-1b schematic three-dimensional views of haptic operating devices with a magnetorheological braking device;
• 2 a side view of a haptic operating device with a magnetorheological braking device;
• 3a-3c different cuts of haptic operating devices;
• 4a-4b a highly schematic view of a sensor device and measurement results;
• 5 a highly schematic view of a haptic operating device with a snap disk in different positions;
• 6-8 other haptic controls in section; and
• 9 a highly schematic circuit for driving the electric coil.

1a and 1b show two different haptic operating devices 100 according to the invention, which each include a magnetorheological braking device 1 and which can be used on different device components 200.

1a 10 shows a haptic control button 101 as a haptic control device 100. The control button 101 is attached via the console 50 and can be mounted in a motor vehicle, for example. The operating button 101 is operated via the casing part 13 or a rotary part fitted thereon. A user interface 43 can additionally be used to transmit information.

In 1b the device component 200 is shown as a thumb roller 102 with a haptic operating device 100 . The thumb roller 102 can preferably be used, for example, in steering wheels of motor vehicles or the like. However, the thumb roller is not limited to this use case. Depending on the installation situation, the thumb roller 102 can generally also be used with any other finger.

A haptic operating device 100 can be used, for example, to operate machines, medical devices or for use in and for a motor vehicle. In a motor vehicle, the haptic operating device 100 can be used, for example, to operate air conditioning systems, radios, entertainment, navigation, distance control, the driving assistant, to adjust the seats and to operate the infotainment system. It is also possible to use it on other devices or devices.

2 shows a side view of a haptic control device 100, as a control button 101 can be used. The haptic operating device 100 includes a holder 4, which can be fastened to a console 50, for example, via a nut 51. The haptic operating device 100 comprises a magnetorheological braking device 1 with two braking components 2, 3, of which the inner braking component 2 here in 2 is not visible. The inner brake component 2 is connected to the holder 4 . The holder 4 and the inner brake component 2 are designed to be stationary here. The other brake component 3 includes the casing part 13 and is rotatably accommodated on the first brake component 2 .

The haptic operating device 100 has a compact design and inside the shielding device 75, which has a two-part shielding body 76 as a shielding housing, has a sensor device 70 (not visible here) for detecting the rotational position and the axial position of the casing part 13. The casing part is via pins 16 13 is connected to a left lid 14 and a right lid 15 to seal an inner closed chamber 110.

In the 3a until 3c are possible cross sections of a haptic operating device 100 according to the invention, e.g. e.g 2 pictured. The haptic operating device 100 has a magnetorheological braking device 1. The braking component 2 is accommodated on the holder 4, which extends in the axial direction and to which the core 21 is fastened. The core 21 is surrounded radially by the casing part 13 as the outer or second brake component 3.

The magnetically conductive core 21 is surrounded by an electrical coil 26 which is wound around the core 21 . The electrical coil extends over an axial width 26e. At the end of the core 21 facing the holder 4, a disk contour 41 is formed, which is applied here to the core and z. B. is pressed. For this purpose, the disk contour 41 has a disk body 42 designed as a hollow cylinder. The receptacle on the core can also be non-round.

In particular, the core 21 can be made of sintered material (metal). The core can thus be manufactured more easily in the desired shape.

The disk body 42 consists here of a disk pack 44 which is formed by a plurality of thin disk plates 46 . Here, the sheet metal disks 46 are each formed as a stamped part and can be stamped out, for example, from a magnetically conductive sheet metal with a thickness of 1 mm or 2 mm or even 3 mm. In this way, the required number of sheet metal panes can be punched out easily and inexpensively in order to produce the desired thickness of the pane body 42 .

The individual disc plates 46 are pressed together and applied to the core 21 and thus, for example, screwed or pressed. A braking gap section 5a remains in the area of the disc body 42 with a small gap height 41b between the outer diameter of the disc contour 41 and the inner circumference of the casing part 13. The axial width 41e of the disc contour 41 or its braking gap section 5a is determined here by the number of disc laminations 46 and can be larger or smaller than shown.

Here, the disk contour 41 is axially directly adjacent to the electrical coil 26 , which is accommodated in a coil holder 26b and is completely sealed radially on the outside by a casting compound 28 .

The disk body 42 is connected to the core 21 and to the fixed brake component 2 and does not rotate during operation. This enables a hole or recess to be formed for the cable 45 to be fed through for the electrical connection of the electrical coil 26. The electrical coil 26 can thus be connected simply, inexpensively and quickly.

The disk contour 41 is formed here at the proximal end, that is to say at the end of the core 21 which faces the holder 4 . At the distal end, that is, at the other end of the core 21, a braking gap portion 5b is formed. The braking gap section 5b extends over an axial width 11e. There, the rolling elements 11 are distributed on the circumference of the core 21 . The rolling elements 11 reinforce the magnetic field locally. The rolling bodies 11 can form a kind of magnetic field concentrators 80 for local amplification of the magnetic field when passing through the brake gap section 5b.

A very high braking torque can be achieved by the braking gap section 5b, in particular at low speeds of rotation of the casing part 13. A strong magnetic field can be transmitted from the core 21 to the casing part 13 through the braking gap section 5a in the region of the disk contour 41, since the gap height 41b is considerably less than the radial free space 11c in the region of the braking gap section 5b. As a result, a high torque can be generated, which is also made possible, in particular, at higher speeds. This means that a high torque can be made available over the entire speed range.

The axial width 11e of the braking gap section 5b and the width 41e of the braking gap section 5a are approximately the same here (+/−25%) and together are somewhat shorter than the electrical coil 26. A very compact structure is achieved overall.

The casing part 13 is in 3a surrounded by a coating 49 as a knob 23. The knob 23 is at least partially transparent so that it can be illuminated by the lighting means 18 in the form of LEDs, for example. The lighting can be controlled depending on the situation or independently of the situation.

At the front end, the closed chamber 110 inside the casing part 13 is closed off by a front cover 14 through which the brake component 2 is passed. A seal 38 is used for sealing. At the rear or distal end, the chamber 110 is initially delimited by an elastic membrane 31, which is adjoined to the outside by a click element 29 designed here as a snap-action disk.

The snap-action disk or the click element is actuated by axial actuation of the rotary knob 23 and the jacket part 13 is moved somewhat to the left overall. This axial movement can be detected by the sensor device 70 with the magnetic field sensor 72 inside the holder or the first brake component 2 , which is surrounded radially by a magnetic ring unit 71 . The magnetic field sensor 72 is designed in particular as a Hall sensor 72 and detects the orientation of the radial magnetic field relative to the magnetic field sensor 72. An angular position of the casing part 13 relative to the core 21 can be detected via this. An axial displacement of the casing part 13 by actuating the click element 29 leads to a relative axial displacement between the magnetic ring unit 71 and the magnetic field sensor 72, which causes a change in intensity of the detected signal. Actuation of the click element can be detected via this.

3b shows a slightly different representation of a haptic operating device 100 with a magnetorheological braking device, in contrast to FIG 3a the coating 49 or the rotary knob 23 has been omitted.

A major difference between the 3a and 3b is that in 3b the first braking gap section 5a with the disk contour 41 is provided at the distal end of the casing part 13, while the second braking gap section 5b with the rotary bodies 11 is provided at the proximal end of the casing part 13.

In this configuration, for example, outside of chamber 110 between seal 38 and sensor device 70 there can also be a bearing for mounting jacket part 13 with respect to brake component 2 . However, it is also possible here for the bearing to take place at one end only via the seal 38 and at the other distal end only via the disk contour 41 .

Examples are shown in 3b some magnetic field lines 8, which show the largely axial course of the magnetic field lines in the core 21 and in the jacket part 13. Furthermore, it can also be seen that in each case an (approximately) radial passage of the magnetic field lines 8 takes place in the braking gap sections 5a and 5b. A higher torque is generated in the brake gap section 5a at higher speeds, while a higher torque is generated in the brake gap section 5b at lower speeds.

The magnetic field sensor 72 is mounted on a sensor circuit board 79 and can be contacted via the contact pins 79a. The electrical coil 26 is also supplied with current via this.

At least in the area of sensor device 70 and magnetic field sensor 72, inner brake component 2 is preferably made of a material that is not magnetically conductive or has little or no magnetic conductivity, in order to enable detection of the orientation and the intensity of the magnetic field of magnetic ring unit 71 in the interior of axle 12 or the to ensure first brake component 2. The sensor device 70 is accommodated there in a particularly protected manner (protection from water and dust).

In 3b an O-ring 39 can be seen, which seals the cover 14 against the casing part 13 .

3c shows basically schematic cross sections of the braking gap sections 5a and 5b. Here, the brake gap section 5b is shown on the left, wherein the core 21 can be seen inside, on which the rolling bodies 11 are arranged schematically all around. The rolling bodies are in turn surrounded by the casing part 13 . The rolling elements each have a diameter 11d. A radial gap height 11b is slightly larger than the diameter 11d. A radial free space 11c results as the difference between the gap height 11b and the diameter 11d. The radial free space 11c is generally divided relatively evenly radially on the inside and radially on the outside.

A magnetorheological medium which comprises magnetorheological particles 19 is accommodated in the chamber 110 . In the chamber 110 a gap 5 is provided between the brake components 2 and 3 . The chamber 110 is at least partially filled with a magnetorheological medium 6 here. The medium here is preferably a magnetorheological fluid which, for example, comprises an oil as the carrier liquid, in which ferromagnetic particles 19 are present. Glycol, grease, water and viscous materials can also be used as a carrier medium, but are not limited to them. The carrier medium can also be gaseous or the carrier medium can be dispensed with (vacuum). In this case, only particles 19 that can be influenced by the magnetic field are filled into the chamber 110 .

The ferromagnetic particles 19 are preferably carbonyl iron powder, with the size distribution of the particles depending on the specific application. A particle size distribution of between one and ten micrometers is specifically preferred, although larger particles of twenty, thirty, forty and fifty micrometers are also possible. Depending on the application, the particle size can also become significantly larger and even reach the millimeter range (particle balls). The particles can also have a special coating/shell (titanium coating, ceramic, carbon shell, etc.) so that they can better withstand the high pressure loads that occur depending on the application. For this application, the magnetorheological particles can be made not only from carbonyl iron powder (pure iron), but also e.g. B. can also be made of special iron (harder steel).

It is possible that only particles that can be influenced by the magnetic field are filled into the gap 5 or the chamber 110, with air or an inert gas being added if necessary. if e.g. B. only air or another gas is used, different solids can be mixed to improve certain properties. For example, graphite powder can be mixed in order to reduce the friction between the carbonyl iron particles since graphite exhibits a lubricating effect. In particular, the particles can be coated with PTFE. In particular, a coating with PTFE or a comparable coating prevents the particles from clumping together and forming larger heaps. Such larger heaps do not disintegrate easily or may not disintegrate at all. Alternatively, the disk bodies or roller bodies can be coated with PTFE to reduce friction. When using MRF without oil or other liquid as a carrier medium, it must be ensured that no water condenses in the brake chamber (MR space or MRF space). For example, silicic acid gel (known as silica gel) or another desiccant that absorbs water and thus removes moisture from its surroundings can be mixed in.

The magnetorheological particles 19 chain together when a magnetic field is applied, as in 3c shown very schematically on the left. This creates a wedge effect, which leads to a significant increase in the braking torque at low and medium speeds.

For a more detailed explanation of this effect is on the 4 the international registration WO 2018/215350 A1 referred to the applicant, which is fully included in the scope of disclosure of this application with regard to the explanation of the effect in an adapted manner.

In 3c A cross section through the brake gap section 5a in the area of the disk contour 41 is shown on the right. Radially on the outside between the outer contour of the disc contour 41 and the inner circumference of the casing part 13 there is a gap height 41b which is considerably smaller and can be selected to be considerably smaller than the radial free space 11c in the braking gap section 5b. The disc body 42 can be designed as a disc pack 44 and can include a plurality of disc metal sheets 46 .

For example only is in the right part of 3c a rolling element 11 shown in dashed lines to illustrate the differences. It can be clearly seen that the disc body 42 allows a gap height 41b with a smaller height. As a result, a strong braking torque and a high magnetic field strength can be achieved and transmitted there, which then also causes a correspondingly higher magnetic field strength and braking effect in the other brake gap section 5b.

In 4a the sensor device 70 is shown in detail. The first brake component 2 and the second brake component 3 embodied here as a casing part 13 are only indicated (dashed lines). The sensor device 70 is supported via the decoupling device 78 on the rotatable second brake component in a magnetically decoupled manner. The shielding device 75 consists here of three shielding bodies 76 which reduce the scattering of the magnetic field 8 of the electrical coil 26 . The shielding device 75 can also consist of only pot-shaped bodies or a pot-shaped body and a disk-shaped body which are connected to one another.

In addition, there is also a separation unit 77 for magnetic separation. The magnetic ring unit 71 is used to measure the orientation or the angle of rotation of the magnetorheological braking device 1 . The magnetic field sensor 72 is within this range non-magnetic trained first brake component 2 is arranged. Small relative axial displacements, such as those caused by pressing a snap-action disk, can be used to detect the actuation of the control button 101, such as 4b indicates. The angle of rotation and the orientation of the magnetic field lines drawn in by arrows can be detected by the magnetic field sensor 72 .

An axial displacement changes the received signal 68 of the sensor device 70 as shown in FIG 4b . 4b shows the course of the amplitude 69 of the signal 68 detected by the magnetic field sensor 72 as a function of the axial displacement of the brake components 2, 3 relative to one another. The amplitude 69 of the detected signal 68 changes as a result of an axial displacement of the magnetic field sensor 72 in relation to the magnetic ring unit 71. An axial displacement or pressing down of an operating button 101 can be detected in this way.

The angle of rotation can also be detected with the same sensor 72, the direction of the magnetic field 8 (arrows shown) being determined to detect the angle of rotation. The intensity determines the axial position. A change in the signal 68 can therefore be used to infer that a button or the snap disk 29 has been actuated. This is advantageous since a single (multidimensional) Hall sensor can be used to determine the angular position and to determine an axial position.

5 shows the haptic operating device with a snap-action disc 29 in two different positions in a highly schematic manner, the unactuated position being illustrated on the left and the actuated position on the right. In the illustration on the left, the snap-action disc is curved outwards and downwards here and is guided here by the guide 29a in the core (but not supported, so there is almost no friction).

The volume of the spanned triangle 29b is in the right half of the to recognize. The volume 29b results approximately from the three-dimensional cone. If the haptic operating button 100 is actuated and the snap disk 29 is transferred from the rest position (deflected) to a linear position within one plane, the casing part 13 is displaced here axially downward in relation to the first brake component 2 . As a result, an axial section 22 of the axle or of the first brake component 2 dips into the inside of the casing part 13 . The change in volume 29b of the snap-action disk 29 is preferably dimensioned in such a way that it essentially corresponds to the immersed volume of the first brake component 2 . The immersed volume is calculated from the axial path 22 multiplied by the cross-sectional area of the first brake component 2 on the axle 12. By bringing the surface 29b as close as possible to it, a pressure build-up in the interior of the chamber 110 can be minimized or prevented. Volume balancing can also be provided by a membrane 31 as previously discussed.

6 shows a schematic cross section of another haptic operating device, wherein the first brake component 2 is fixed to a holder 4, for example with grub screws. In this configuration, too, two brake gap sections 5a, 5b are provided, with a disk contour 41 being formed on the brake gap section 5a and rolling bodies 11 or rotary bodies on the circumference of the core 21 being accommodated on the brake gap section 5b. The rolling bodies are guided over brackets 11f.

Here, the disk contour 41 has an outwardly protruding outer contour 47 at the axially outer end, which is designed here, for example, as a cone, but can also be designed as a pin. As a result, a reservoir 32 for magnetorheological particles remains in each of the corner regions in order to ensure that the brake gap sections are adequately supplied with magnetorheological particles. In particular, carbonyl iron particles are attracted from the environment and concentrated in the magnetic field transition region.

Screws 48 are used to fill or empty chamber 110.

7 and 8th branch two further embodiments of a haptic operating device, wherein in both cases the disc contour 41 is formed with the brake gap section 5a at the distal end.

In 7 It can be seen schematically how a separate receiving ring for the rolling bodies 11 is fastened to the core 21 by a nut 40b in the braking gap section 5b.

In 8th an exemplary embodiment is shown in which both a separate receiving ring for the rolling bodies 11 and the disk pack 44 for the disk body 42 are each fastened to the core 21 via nuts 40b.

In 8th a cover 14 is attached to the front end and a cover 15 is attached to the rear end.

The disc body 41 can be formed separately and in one piece or can also be used as Disc package 44 may be formed with a plurality of disc plates 46.

Overall, a haptic operating device that can be produced very inexpensively is made available, with at least one bearing being able to be saved by “bearing” via the disk contour 41, as a result of which the overall height is also reduced. A very low basic friction is achieved. By using fewer parts, manufacturing becomes easier and less expensive. The tolerance requirements are also improved by a smaller number of parts, since tolerance chains are avoided. A haptic control button with a haptic control device can be used in a wide variety of areas.

If necessary, an actuation can be detected via a snap part or a snap disk or a button or the like. The rotary knob can be illuminated, for example, via LEDs or the like. The body of the rotary knob can then be made partially or entirely milky in order to achieve a corresponding scattering effect.

9 shows a schematic of a circuit for rapid activation of the electric coil 26. The electric coil 26 (magnetic coil) is activated here by an H circuit. This is in the 9 only indicated by switches. A voltage source 35a used in normal operation or in continuous operation with a lower voltage of z. B. 12V provides the voltage for normal operation. For the voltage peaks, a voltage source 35b with a higher voltage of, for example, 18V or 24V is connected via a switch. Then, the lower voltage power source 35a is temporarily disconnected. After the maximum current has been reached, the higher voltage source 35b is again disconnected from the circuit and the electrical coil 26 and the lower voltage source 35a is reconnected. The switches can be any electrical components that are particularly capable of coupling and decoupling in the millisecond range.

As a result, the current in the electrical coil 26 reaches the desired value more quickly. In a specific case, the desired current is reached within 10ms instead of 40ms. The change between the voltages can take place via an electrical circuit.

The invention provides a haptic operating device that is compact, robust and very inexpensive. The haptic control device is particularly suitable for use in the automotive industry, but can also be used in all kinds of devices and machines.

A major advantage of the construction is that no cables, sensors or electronics are required on the outside. A high IP class is therefore possible in all configurations. In principle, everything is behind a mounting panel.

The electrical coil is preferably completely separated from the space containing the magnetorheological medium, in particular by means of a casting compound.

In preferred configurations, an axial displacement is possible, in which case, in particular, a liquid volume is displaced in the interior. Sufficient space is preferably provided between a cover and a disk contour so that the medium (or liquid) (carbonyl) therebetween is not compressed. (Otherwise this could lead to high axial adjustment forces.) This provides an additional MRF reservoir from which particles can flow into the area of the disk contour or the rolling elements. Namely, magnetic particles always flow in the direction of the stronger field since magnetic particles are attracted by the magnetic field gradient.

The seal preferably runs on the axle. There is rotary movement (more than 100,000 revolutions are possible) and there can be linear movement for the probe. To ensure that the seal does not run in and form a running groove and that the friction is low and the leakage (drag oil) does not become too high over the service life, a corresponding material pairing with a hard running surface is preferred.

As previously described, two rows with different magnetic field concentrators are used. The first brake gap section 5a is equipped with a disk contour. The second braking gap section 5b is equipped with rolling bodies and, in particular, rollers. Rolling elements and especially rollers with a round inner ring enable a high static moment. A disk contour enables good magnetic field transmission and high torque at high speeds.

The combined solution, also called hybrid solution, combines both advantages. In contrast, an axial transition of the magnetic field in the prior art had a smaller transition area and thus resulted in lower braking torques. In addition, an axial magnetic field transition has a smaller distance (radius) and therefore generates less moment. A braking gap section that is also radial In contrast, 5a with a disk contour has a larger diameter and thus generates a greater moment with the same force. In addition, the area is larger because the larger circumference spans a larger area. If the width of the contour disc is greater than 1/6 of the diameter, the braking torque that can be transmitted at the (circumferential) radial braking gap section is already greater than the maximum braking torque that can be transmitted on the axial surface! Finally, due to the lower gap height at the disk contour, the magnetic losses are smaller. All of this results in a higher braking torque, even at higher speeds.

Volume compensation for the push function can be provided by a membrane at the end of the jacket part. Behind the membrane is a click element like a snap disk ("snap dome"). This gives a haptically perceptible pressure point. In addition, you can hear the click when the pressure point is reached and the snap disk pushes the entire button or the shell part back into the starting position (similar to a mouse button on a computer mouse).

The membrane then seals the MRF space. The volume behind the membrane acts as a volume balance when pressed. In the normal position, the snap-action disc has a bulge. If the button is moved in the axial direction, the stator of the braking device presses against the membrane and the snap-action disk. This will flatten it out.

The design of the haptic control device can be enhanced by adding various light effects to the cover. A cost-effective option is to use a cap/cover with a transparent element that is illuminated from below with LEDs. This can either be done by attaching a transparent sleeve to the shell part or by incorporating it into the cover, or by making the entire inside of the cover as such (an inverted pot). For this purpose, the transparent part can be beveled at the edges in order to deflect the light in the desired direction.

Normal glass can be used as the transparent material, or PMMA (acrylic glass). The advantage of PMMA is that you can use milky glass, which breaks the light inside and can thus illuminate the entire surface evenly. One or more LEDs can be used for lighting, also with different colors.

In all configurations, the outer brake component can also be non-rotatable and the inner brake component can be the rotatable component. In this case, the electric coil must be electrically contacted via lines through the outer braking component or e.g. B. via sliding contacts.

Reference List

1

Magnetorheological braking device

2.3

braking component

4

holder

5

gap

5a

Braking gap section for 41

5b

Braking gap section for 11

6

medium

8th

magnetic field, field

10

acute-angled area

11

rolling elements

11b

gap height of 5b

11c

radial clearance at 5b

11d

diameter of 11

11e

axial width of 11

11f

bracket

12

axis

13

jacket part

14

Diploma

15

conclusion, lid

16

Pen

18

bulbs

19

magnetic particles

20

Axis of rotation, axial direction

21

core

22

hub

23

knob

26

Kitchen sink

26b

spool holder

26e

axial width

28

potting compound

29

snap disk

29a

guide

29b

volume

31

membrane

32

reservoir

35a

Power supply 12V

35b

Power supply 18V

38

poetry

39

o ring

40b

mother

41

disc contour

41b

gap height of 5a

41e

axial width of 5a

42

disc body

42a

recording

43

user interface

44

disc package

45

Cable

46

sheet metal

47

bulging outer contour

48

filling screw

49

coating

50

console

51

mother

68

signal

69

amplitude

70

sensor device

71

magnetic ring unit

72

magnetic field sensor

75

shielding device

76

shielding body

77

separation unit

78

decoupling device

79

sensor board

79a

contact pin

80

magnetic field concentrator

100

Haptic control device

101

control head

102

operating roller

110

closed chamber

200

device component

Claims (29)

Haptic operating device (100) with a magnetorheological braking device (1) with a stationary holder (4) and with at least two braking components (2, 3), one of the two braking components (2, 3) being non-rotatably connected to the holder (4) and wherein the two brake components (2, 3) are continuously rotatable relative to each other about an axis of rotation (20), wherein a first brake component (2) extends along the axis of rotation (20) and comprises a core (21) made of a magnetically conductive material and wherein the second brake component (3) comprises a hollow casing part (13) extending around the first brake component (2), wherein between the first and the second brake component (2, 3) there is a peripheral medium (6 ) Filled gap (5) is formed, wherein between the shell part (13) and the core (21) at least one around the axis of rotation (20) wound around and the core (21) surrounded end of the electrical coil (26), characterized in that the gap (5) comprises at least two different radially designed brake gap sections (5a, 5b), a first brake gap section (5a) having a disk contour (41) between the casing part (13) and the core (21), and wherein a plurality of rolling elements (11) are arranged on the periphery of the core (21) in a second braking gap portion (5b). Haptic operating device (100) after claim 1 , The disc contour (41) being designed as a separate disc body (42) or in one piece with the core (21). Haptic operating device (100) according to the preceding claim, wherein the disk body (42) is applied to the core (21) and has a receptacle (42a) adapted to the core (21). Haptic operating device (100) according to any one of the preceding claims, wherein the disc contour (41) connected to the core (21) and z. B. is pressed or screwed. Haptic operating device (100) according to one of the preceding claims, wherein the disk contour (41) is designed as a disk package (44) with a plurality of disk plates (46). Haptic operating device (100) according to the preceding claim, wherein at least one disc plate (46) is designed as a stamped part. Haptic operating device (100) according to one of the two preceding claims, in which the disk pack (44) comprises disk plates (46) which are designed to be essentially round and designed to be non-round. Haptic operating device (100) according to one of the preceding claims, wherein the disc contour (41) has an outwardly protruding outer contour (47) on at least one axial side. Haptic operating device (100) according to one of the preceding claims, wherein a radial free space (11c) for a rolling element (11) between the casing part (13) and the core (21) in the second braking gap section (IIa) is greater than a gap height (41b ) in the first braking gap section (5a). Haptic operating device (100) according to the preceding claim, wherein the radial free space (11c) for a rolling body (11) in the second brake gap section (IIa) is more than twice as large as the gap height (41b) in the first brake gap section (5a). Haptic operating device (100) according to one of the preceding claims, wherein the first and the second braking gap section (5a, 5b) are formed on different axial sides of the electrical coil (26). Haptic operating device (100) according to one of the preceding claims, wherein an axial width (11e) of the rolling bodies (11) is between half and twice the axial width (41e) of the disk contour (41). Haptic operating device (100) according to one of the preceding claims, wherein a ratio of an axial width (11e) of the rolling elements (11) to an axial width (26e) of the electric coil (26) is between 1:5 and 3:2 and wherein a Ratio of an axial width (41e) of the disc contour (41) to an axial width (26e) of the electrical coil (26) is between 1:5 and 3:2. Haptic operating device (100) according to one of the preceding claims, wherein the magnetic field (8) of the magnetic circuit runs at least in part axially through the core (21) and the casing part (13) and essentially radially through the first and the second brake gap section (5a, 5b) passes. Haptic operating device (100) according to any one of the preceding claims, wherein the disc contour (41) rotatably guides the casing part (13) and serves as a bearing point. Haptic operating device (100) according to one of the preceding claims, wherein a gap height (41b) at the braking gap section (5a) on the disc contour is less than 0.15 mm or less than 0.1 mm. Haptic operating device (100) according to one of the preceding claims, wherein a closed chamber (110) is formed between the brake components (2, 3), and wherein the closed chamber (110) contains at least a significant proportion of a magnetorheological medium (6) such as is filled with a magnetorheological fluid and/or carbonyl iron powder. Haptic operating device (100) according to one of the preceding claims, wherein the second brake component (3) is accommodated in an axially displaceable manner on the first brake component (2). Haptic operating device (100) according to one of the two preceding claims, wherein a click element (29) is arranged at the distal end (115) of the chamber (110). Haptic operating device (100) according to the preceding claim, wherein an elastic membrane (31) separates the chamber (110) from the click element (29). Haptic operating device (100) according to one of the two preceding claims, wherein the click element is designed as a snap disk and wherein a change in the spanned volume of the snap disk is adapted to a cross-sectional area of the axis multiplied by an axial offset of the snap disk upon actuation. Haptic operating device (100) according to one of the preceding claims, wherein a sensor device (70) for detecting a relative angle of rotation between the core (21) and the casing part (13) is included. Haptic operating device (100) according to one of the preceding claims, wherein a sensor device (70) for detecting a relative axial position of the casing part (13) to the brake component (2) is included. Haptic operating device (100) according to one of the three preceding claims, comprising a shielding device (75) for at least partially shielding the sensor device (70) from a magnetic field of the electric coil (26). Haptic operating device (100) according to the preceding claim, wherein an illuminant (18) for illuminating an at least partially transparent rotary knob (23) is included, which is accommodated on the casing part (13). Operating button (101) with a haptic operating device (100) according to one of the preceding claims. Device component (200) with a haptic operating device (100) according to one of the preceding claims. Device component (200) according to the preceding claim, comprising at least one user interface (43), a control panel, a display, a touch-sensitive display with or without haptic feedback and/or at least one sensor. Use of a haptic operating device with a braking device in order to generate a high braking torque over a larger speed range, the braking device comprising at least two different radially designed braking gap sections (5a, 5b), and with a disc contour (41) between the first braking gap section (5a). the casing part (13) and the core (21) in order to generate a high braking torque at higher speeds, and wherein a plurality of rolling elements (11) are arranged on the circumference of the core (21) in a second braking gap section (5b). to generate a high braking torque at lower speeds.

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