WO2025003401A1 - Vorrichtung mit einer magnetorheologischen übertragungseinrichtung - Google Patents
Vorrichtung mit einer magnetorheologischen übertragungseinrichtung Download PDFInfo
- Publication number
- WO2025003401A1 WO2025003401A1 PCT/EP2024/068249 EP2024068249W WO2025003401A1 WO 2025003401 A1 WO2025003401 A1 WO 2025003401A1 EP 2024068249 W EP2024068249 W EP 2024068249W WO 2025003401 A1 WO2025003401 A1 WO 2025003401A1
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- WO
- WIPO (PCT)
- Prior art keywords
- magnet
- unit
- magnetic
- component
- rotary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T10/00—Control or regulation for continuous braking making use of fluid or powdered medium, e.g. for use when descending a long slope
- B60T10/02—Control or regulation for continuous braking making use of fluid or powdered medium, e.g. for use when descending a long slope with hydrodynamic brake
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D57/00—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders
- F16D57/002—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders comprising a medium with electrically or magnetically controlled internal friction, e.g. electrorheological fluid, magnetic powder
Definitions
- the invention relates to a device with at least one magnetorheological transmission device with at least two rotary components that can move relative to one another. At least one active gap is formed between the rotary components, in which a magnetorheological medium is arranged. A controllable magnetic field can be generated in the active gap by means of at least one electrical coil device in order to influence the rotatability of the rotary components during normal operation.
- Such devices can be designed as operating devices and can be used to set operating states.
- the magnetorheological transmission device can then be used to set different moments or forces, stops and grids for the movements. This means that haptic (tangible) feedback can be transmitted during operation, which supports the user and allows very specific settings and reduces the overall complexity of operation.
- Such operating devices are increasingly being used in a wide variety of devices, for example in motor vehicles or medical technology or even in smart devices, for example to select menus or carry out precise controls.
- Such devices are also increasingly being used to operate computers and games consoles.
- the device should therefore be very compact and at the same time reliably designed and have as low a base moment as possible.
- such devices can also be used as a steering control device to specify a steering movement according to the steer-by-wire concept.
- High demands are placed on such steering control devices.
- precise steering feedback and steering behavior that is free of play or jerks, particularly around the center position, as well as overall very smooth, harmonious steering behavior are required.
- haptically perfect controllability in normal operation active resetting
- Only very smooth-running steering units preferably ⁇ 0.3 Nm, for example ⁇ 0.1 Nm, basic torque of all steer-by-wire steering components
- the steering device must be able to provide high torques or counteract the manual steering movement (the torque then corresponds to a braking torque). This is, for example, to represent end stops, for supporting yourself when getting out or as a counter torque for very fast twists or steering movements.
- a key feature of such devices is safety in the event of a malfunction, for example if the magnetic field of the coil device is lost. Then no more torque is opposed to the rotary movement or steering movement and no more resistance is felt during operation.
- an additional brake can be used to slow down the rotation of the rotating components in the event of a malfunction.
- the additional brake often leads to an increase in costs, installation space and weight, as well as an increase in the base torque.
- the device according to the invention comprises at least one magnetorheological transmission device.
- the transmission device comprises at least two rotary components that can be moved relative to one another.
- the rotary components are arranged coaxially to one another at least in sections.
- At least one active gap (running in the circumferential direction) is formed between the rotary components.
- At least one magnetorheological medium is arranged in the active gap.
- the device comprises at least one electrical coil device for generating a controllable magnetic field in the active gap. In particular, the generation of the magnetic field serves to influence the rotatability of the rotary components during normal operation (and preferably to brake or release it).
- the device comprises at least one additional brake for braking the rotatability of the rotary components when the magnetic field of the coil device is lost and in particular in the event of a malfunction.
- the additional brake comprises at least one magnetic device that extends at least partially in the circumferential direction of the active gap and/or the rotary components. In particular, the magnetic device extends at least partially along the circumference of the active gap and/or the rotary components.
- the magnetic device comprises at least one magnet unit.
- the magnet unit comprises at least one permanent magnet which extends only over a part of a circumference (in particular the effective gap and/or the rotary components). In particular, the at least one permanent magnet extends over less than 360° of a circumference of 360°.
- the part of the circumference corresponds in particular to a circumferential segment with an angle of less than 360°.
- the device according to the invention offers many advantages.
- a significant advantage is the permanent magnet(s) that only run over part of the circumference. This allows the Additional brakes can be manufactured much more cheaply and with less effort.
- the magnetic device can be installed more easily and quickly and can also be accommodated in a particularly space-saving manner.
- a further advantage is that no special tolerance requirements have to be met for the integration of the permanent magnets into the transmission device. For example, tight manufacturing tolerances are necessary for the integration of ring magnets in order to achieve the intended braking effect.
- ring magnets are very sensitive to handling and are very brittle, for example.
- the at least one magnet unit is preferably arranged (only) on one of the rotary components and preferably fastened.
- all magnet units of the magnet device are arranged on one (the same) rotary component.
- the at least one magnet unit is arranged and preferably fastened to the radially outer rotary component.
- the magnet unit is arranged at least partially on the radial and/or axial outer side of the radially outer rotary component.
- the at least one magnet unit can also be arranged on the radially inner rotary component. In this case, it is arranged in particular at least partially on its radial inner side and/or on its axial outer side.
- the at least one magnet unit is preferably arranged and in particular fastened at least partially on a radial or axial outer side of the rotary component facing away from the active gap.
- the magnet unit can protrude at least partially on the outer side (in the radial and/or axial direction). In particular, the entire magnet unit protrudes on the outer side.
- the magnet unit can also extend at least partially into the rotary component.
- the magnet unit can be flush with the outer side of the rotary component.
- the at least one magnet unit can be mounted from radially outside and/or axially outside the radially outer rotary component. It is also preferred and advantageous that the at least one magnet unit can be mounted when the medium is arranged in the effective gap.
- the at least one magnet unit can be mounted when the effective gap is already filled with the medium.
- the magnet unit can be mounted when the rotary components are assembled coaxially as intended. It is also possible that the at least one magnet unit can be mounted from radially inside the radially inner rotary component.
- the at least one magnet unit is arranged (at least in relation to its at least one permanent magnet) at a distance from a rotation axis of the rotary components.
- the at least one magnet unit is arranged coaxially to the rotary components and the effective gap. It is possible and advantageous for the at least one magnet unit and the rotary components or the effective gap to be arranged so as to overlap in the radial direction.
- the at least one magnet unit and the rotary components and/or the effective gap lie at least partially on a common alignment line in the radial direction. It is also possible for the at least one magnet unit to be arranged offset axially outwards so that it is not arranged so as to overlap with the rotary components and/or the effective gap in the radial direction.
- the at least one magnet unit is arranged axially next to the rotary components and/or the effective gap.
- the at least one magnet unit is then arranged in particular on an axial outer side of the rotary component.
- the magnet unit is arranged with one of the rotary components on a common side of the effective gap.
- the other rotary component on which the magnet unit is not arranged
- the at least one magnet unit is conductively and preferably magnetically connected to one of the rotary components.
- the magnet unit is thereby integrated into a magnetic circuit through which the magnetic field of the magnetic device flows.
- the magnet unit can be conductively connected to the rotary component directly or indirectly (for example by means of a connecting unit).
- the magnet unit has two magnetic poles (a north pole and a south pole).
- both magnetic poles are conductively connected to the rotary component.
- the at least one permanent magnet of the at least one magnet unit is connected directly (in contact) to the rotary component.
- the rotary component has at least one flattened area at least in a receiving area for the permanent magnet.
- the flattened area is preferably arranged on a radial outer side. This makes it possible to save on expensive permanent magnets with complex curvatures.
- the at least one permanent magnet is designed to be planar at least in a contact area for contact with the rotary component.
- the at least one permanent magnet can be (constantly) curved at least in a contact area for contact with the rotary component.
- the curvature of the contact area corresponds to a curvature of the rotary component and in particular to a curvature of its radial outside or inside.
- the permanent magnet it is possible for the permanent magnet to be curved overall (and not just in the contact area).
- the permanent magnet then has the geometry of a ring segment.
- the ring segment can also be referred to as a circular segment.
- the ring segment only extends over part of the circumference.
- the magnetic device comprises at least one (magnetically) conductive connection unit.
- the at least one magnetic unit (at least in relation to its at least one permanent magnet) is (magnetically) conductively connected and preferably firmly connected to one of the rotary components by means of the at least one connection unit.
- the connecting unit forms part of a magnetic circuit in which the magnetic device is also integrated.
- the connecting unit is connected to a magnetic pole of the permanent magnet and to the rotating component. It is also possible for the connecting unit to be connected to a magnetic pole of the permanent magnet and an (opposite) magnetic pole of at least one other permanent magnet of the magnetic unit.
- the permanent magnets provided for the magnetic unit are connected either to one another or to the rotating component via at least one connecting unit.
- connection unit can be curved in a contact area for contact with the rotary component.
- the connection unit then has in particular the basic geometry of a ring segment.
- the curvature of the contact area of the connection unit corresponds to a curvature of the rotary component.
- connection unit it is also possible for the connection unit to be planar in a contact area for contact with the rotary component.
- the rotary component then has in particular at least one flattened area (in a receiving area for the connection unit).
- At least one of the rotary components and in particular at least the rotary component on which the at least one magnet unit is arranged has at least one separating gap running in the circumferential direction.
- the separating gap divides the Rotating component into at least two component sections, which are in particular magnetically decoupled from one another.
- the separation gap provides a magnetic flux barrier. In particular, this prevents a magnetic short circuit between the rotating component and the at least one magnet unit (arranged thereon).
- the separation gap is arranged such that a magnetic field emanating from the magnet device cannot bypass the effective gap.
- the separating gap can extend in the radial direction and/or in the axial direction between the component sections.
- the separating gap can open at a radial outer side and/or at an axial outer side of the rotating component.
- the separation gap can be designed as an air gap.
- the separation gap can be at least partially filled with a material that is not magnetically conductive or at least poorly conductive (plastic, metal (e.g. aluminum), etc.).
- the component sections are designed to be magnetically conductive.
- the separation gap is sealed from the active gap and/or from the environment. This prevents the magnetorheological medium from entering or leaving the separation gap.
- the separation gap it is possible for the separation gap to be continuous. So that the component sections are connected to one another in a rotationally fixed manner despite the continuous separation gap, a solid, non-magnetic or poorly conductive material is preferably arranged in the separation gap, via which the component sections are joined to one another and, for example, glued.
- a ring made of plastic or the like is used for this purpose.
- the separation gap is interrupted by connecting sections which extend between the component sections and connect them to one another in a rotationally fixed manner.
- the connecting sections are formed by web-like bridges between the component sections and/or by (magnetically non-conductive or poorly conductive) connecting means and e.g. screws or the like.
- the web-like bridges are formed as one piece with the component sections.
- the connecting sections if magnetically conductive
- the at least one connecting unit together with the at least one magnet unit provides a conductive connection between the component sections.
- the magnet unit may comprise at least one horseshoe magnet or to be designed as such. The legs of the horseshoe magnet are then each connected in particular to a component section. This means that the connecting unit can be dispensed with if required.
- the at least one permanent magnet is arranged on (only) one component section.
- the connecting unit extends from the permanent magnets to the opposite component section.
- the magnet unit comprises at least two permanent magnets, of which at least one permanent magnet is arranged on each of the component sections.
- the permanent magnets are then preferably conductively connected by the connecting unit.
- the connecting unit extends between the permanent magnets of the at least one magnet unit separated by the separating gap.
- the connecting unit preferably comprises at least one bridge element or is designed as such.
- the bridge element spans the separation gap and is connected to the permanent magnet and the rotating component or to the permanent magnet or at least one other permanent magnet.
- the permanent magnet is then polarized in the radial direction.
- the permanent magnets of a magnet unit arranged on opposite component sections are then polarized in particular rotated by 180°.
- the north pole is rotated from radially outside to radially inside.
- the connecting unit corresponds at least in sections to the radial outside of the permanent magnet.
- the connecting unit is curved if the permanent magnet is also curved.
- connection unit comprises at least two holding elements.
- at least one holding element is arranged on each component section.
- the holding elements (which belong to a magnet unit) are conductively connected by the at least one permanent magnet of the magnet unit.
- the permanent magnet is then polarized in particular in the axial direction.
- the permanent magnet is arranged centered in particular along the separation gap.
- the holding elements are in particular arranged axially next to the separation gap.
- the magnet device can have a three-part structure for each magnet unit provided.
- the three-part structure comprises in particular two permanent magnets and a connecting unit designed as a bridge element. This results in a structure analogous to a horseshoe magnet.
- the three-part structure can also comprise two connecting units designed as holding elements and a permanent magnet arranged between them.
- connection unit can have at least one fastening section for (magnetically) conductive fastening to the rotary component.
- the Fastening section is planar. It is also possible that the fastening section corresponds to a curvature of the rotary component.
- the rotary component then has at least one flattened area in its receiving area for the connecting unit.
- the at least one permanent magnet of the magnet unit is polarized in the axial direction.
- the magnetic poles are then located opposite one another in particular in the axial direction.
- the axial direction runs in particular transversely to the radial direction and/or parallel to the axis of rotation of the rotary components.
- An embodiment is also possible in which the at least one permanent magnet of the magnet unit is polarized in the radial direction.
- the magnetic poles are then located opposite one another in particular in the radial direction (transversely to the axis of rotation of the rotary components).
- the at least one permanent magnet of the magnet unit has a cuboid basic geometry.
- the permanent magnet is not curved and/or does not follow a curvature of the rotary component. This enables particularly inexpensive production and is particularly advantageous when several magnet units are provided.
- Such cuboid permanent magnets can be conductively connected to the rotary component directly or by means of the at least one connecting unit.
- the permanent magnet is planar at least in the contact area with the rotary component and/or the connecting unit.
- the at least one permanent magnet of the magnet unit is curved and preferably has the basic geometry of a ring segment. Despite the more complex production, this can be advantageous under certain conditions. For example, installation space can be saved if only one or a few large magnet units are used. are provided. In addition, the risk of the magnet unit breaking due to its brittle material is also reduced.
- the connection can be made directly or by means of the at least one connecting unit.
- Such a ring segment can, for example, extend over an angle of at least 30° or at least 45° or at least 65° or at least 90° or more of the circumference.
- the at least one magnet unit alone or together with the at least one connecting unit provides a magnetic circuit section.
- the magnetic circuit section is part of a magnetic circuit of the magnetic device.
- the magnetic circuit extends from the magnetic circuit section through the rotary component (on which the magnet unit is arranged) and through the active gap with the magnetorheological medium located therein and through the opposite rotary component and again through the active gap with the magnetorheological medium located therein and back to the magnetic circuit section.
- the at least one permanent magnet of the magnet unit is integrated into the magnetic circuit in such a way that its magnetic poles are each connected to one end of the magnetic circuit and thereby close the magnetic circuit.
- the individual magnet units preferably each form at least one magnetic circuit section alone or with the at least one connecting unit.
- the magnetic device then comprises a plurality of magnetic circuits.
- the magnet units are each part of a magnetic circuit.
- the magnetic circuit section preferably forms a bypass to a magnetic circuit of the transmission device.
- the transmission device comprises in particular at least one magnetic circuit through which the magnetic flux of the magnetic field of the coil device flows to influence the rotatability of the rotating components in normal operation.
- the magnetic circuit section (in particular at least the bypass) is in particular at least connected in sections in parallel to the magnetic circuit of the transmission device. If a plurality of magnetic circuits, each with a magnetic circuit section, are provided, each magnetic circuit section forms in particular a bypass for the magnetic circuit of the transmission device.
- the magnetic circuit section is integrated directly into the magnetic circuit of the transmission device.
- the magnetic circuit section is then connected in series and in particular not in parallel to the magnetic circuit of the transmission device.
- the magnetic circuit of the at least one magnet unit is connected in series to the magnetic circuit of the transmission device.
- the magnetic circuit of the transmission device does not run through the magnetic circuit section.
- the magnetic circuit of the transmission device runs from the rotary component (on which the magnet unit is not arranged) through the active gap with the magnetorheological medium located therein and through the opposite rotary component (on which the magnet unit is arranged) and through its separating gap and again through the active gap with the magnetorheological medium located therein and back into the rotary component.
- the magnetic circuit of the transmission device runs through the component sections and the separating gap between them.
- a field strength or a power of the coil device and the resistance of the separating gap are then coordinated with one another, so that the magnetic flux of the coil device flows at least predominantly through the separating gap and not through the magnetic circuit section.
- the at least one permanent magnet of the magnet unit has magnetic saturation and therefore represents a correspondingly high resistance for the magnetic circuit of the transmission device.
- the resistance of the separating gap is determined in particular by the width and/or the filling.
- the (magnetic) resistance of the separation gap is dimensioned in such a way that it provides a magnetic flux barrier for the magnetic field of the magnet unit, but not for the magnetic field of the coil device.
- the magnetic circuit of the transmission device it is possible for the magnetic circuit of the transmission device to extend from the rotating component (on which the magnet unit is not arranged) through the active gap with the magnetorheological medium located therein and then from there (bypassing the rotating component with the separating gap) directly back to the rotating component (on which the magnet unit is not arranged).
- a field strength or a power of the coil device and a resistance of the separating gap are coordinated with one another in such a way that the magnetic flux of the coil device at least predominantly flows not through the separating gap but through the active gap with the magnetorheological medium located therein.
- the magnetic device comprises a plurality of magnetic units.
- the magnetic units are preferably distributed at a distance around the circumference (at least in relation to their respective at least one permanent magnet). They can also be arranged in a row without any spacing.
- the magnet units are distributed symmetrically over the circumference. This means that the braking torque in the event of an accident can be reliably and easily compensated for in normal operation using the magnetic field of the coil device.
- the magnet units can also be distributed asymmetrically over the circumference. In this case, an additional electrical coil device is provided.
- the magnet units are arranged coaxially to the active gap.
- the magnet units are lined up along the separation gap.
- the magnet units can span the separation gap.
- the magnet units can also be arranged next to the separation gap on one of the component sections.
- each magnet unit provides a magnetic circuit section.
- the individual magnet units are identical or at least analogous and, for example, mirror-symmetrical.
- the magnetic device comprises in particular at least two magnetic units.
- the magnetic device can also comprise at least three or at least four or at least five or at least six magnetic units.
- the magnetic device can comprise at least eight or at least ten or at least twelve magnetic units. For example, up to 24 or up to 36 magnetic units or more can be provided. In particular, the number of magnetic units is matched to the size of the transmission device and the desired emergency braking torque.
- the magnet units together extend over an angle of at least 45° or at least 65° or at least 75° and preferably at least 80° of the circumference. This enables reliable provision of the emergency braking torque.
- the individual magnet units have a length of only a few degrees of the circumference.
- connection unit is assigned to each of the magnet units.
- connection units are also distributed at a distance around the circumference.
- the magnet units each form a pre-assembly unit with their at least one associated connection unit. This further simplifies assembly.
- the common connection unit has the basic geometry of a ring segment and preferably corresponds to the curvature of the rotary component.
- the common connection unit extends over at least part of the circumference.
- the common connection unit can also extend over the entire circumference (360°) and be designed, for example, as a closed ring.
- the common connection unit can form a pre-assembly unit with the magnet units. By assembling the pre-assembly unit, several or all magnet units can then be handled and attached at the same time.
- each magnet unit alone or with their at least one associated connection unit each provide a magnetic circuit section.
- each magnet unit is assigned at least one connection unit in order to form a magnetic circuit section. If several magnet units have at least one common connection unit, each magnet unit forms a magnetic circuit section, in particular together with the common connection unit.
- only one magnet unit is provided.
- the magnet unit then extends over an angle of at least 45° or at least 75° and preferably at least 80° of the circumference.
- the magnet unit extends over an angle of at least 88° and preferably at least 90° (at least a quarter) of the circumference.
- the magnet unit extends over an angle of a maximum of 180° of the circumference.
- the counter-field generating device is suitable and designed to at least partially weaken or eliminate the at least one magnetic field emanating from the magnetic device.
- the counter-field generating device generates at least one magnetic field that is opposite to the at least one magnetic field of the magnetic device.
- the counter-field generating device is preferably provided by the coil device of the transmission device. It is also preferred and advantageous that the counter-field generating device comprises at least one additional electrical coil device. In particular, the additional coil device then provides at least one magnetic field which is opposite to the at least one magnetic field of the magnetic device.
- the additional coil device prefferably has at least one additional coil for each magnet unit provided.
- the additional coil is arranged on the magnet unit and/or on the at least one associated connection unit.
- at least one additional coil is provided for each magnet unit.
- at least one additional coil is provided for each magnetic circuit of the magnet device. This also allows the magnetic fields of magnet units distributed asymmetrically over the circumference to be reliably eliminated.
- the at least one magnetic field emanating from the magnet device can be used to amplify the magnetic field emanating from the coil device of the transmission device.
- the magnetic fields of the individual Magnet units amplify the magnetic field emanating from the transmission device.
- Such amplification is provided in particular in normal operation.
- the coil device is suitable and designed to generate a magnetic field which runs in the same direction as the at least one magnetic field of the magnet device. In this way, a stronger braking torque can be generated with the same power consumption of the coil device.
- the device can be designed as a steering specification device for specifying a steering command according to the steer-by-wire concept.
- one of the rotary components is then coupled to a steering unit and, for example, a steering wheel.
- the mobility of the steering unit can thereby be specifically braked.
- the steering specification device can comprise at least one drive device for generating a torque acting on the steering unit, so that the steering unit can be actively moved.
- the transmission device is then designed as a coupling device, so that the drive device can be coupled to the steering unit with an adjustable coupling torque.
- one of the rotary components can be coupled to the drive device and one of the rotary components can be coupled to an output.
- the steering input device can comprise an actuator device which serves to convert a steering movement carried out with the steering unit into a vehicle movement.
- the steering unit and the actuator device are only operatively connected according to the steer-by-wire concept.
- the device can be designed as an operating device for setting operating states by means of rotary movements and/or linear movements (which are converted into rotary movements).
- the resistance of the rotary movement can be specifically adjusted.
- Such an operating device is, for example, a rotary knob or a joystick or the like .
- the transmission device can be used to specifically change the transmission of force or torque.
- the transmission of force or torque between the rotating components can be adjusted using the coil device and its magnetic field in the effective gap. In particular, this also results in a change in the resistance to movement for the rotation of the rotating components.
- the transmission device can be used as a clutch device or as a braking device.
- the rotating components then serve in particular as clutch components or as braking components and can be referred to as such.
- the torque can also be referred to as braking torque or clutch torque.
- the at least one magnet unit or the magnet unit when, within the context of the present invention, reference is made to the at least one magnet unit or the magnet unit, this particularly refers to all of the magnet units provided in the magnet device. In particular, the at least one magnet unit only extends over part of the circumference.
- the at least one magnet unit consists particularly of at least one permanent magnet.
- the magnet unit can consist of just one permanent magnet.
- the magnet unit can consist of at least (just) two permanent magnets. It is also possible for the magnet unit to consist of at least three or at least four or more permanent magnets.
- the at least one permanent magnet this particularly refers to all of the permanent magnets in the magnet unit.
- the permanent magnets of a magnet unit can be arranged at a distance from one another or in contact with one another. It is possible for the magnet unit to comprise further components in addition to the permanent magnets.
- the at least one magnet unit provides at least one magnetic field which acts on the magnetorheological medium acts so that the rotatability of the rotating components can be braked by means of the additional brake when the magnetic field of the coil device is removed.
- the magnetic device of the additional brake acts on the magnetorheological medium arranged in the active gap.
- the magnetic field of the coil device and the magnetic field of the magnetic device act on the same active gap and preferably also on the same magnetorheological medium.
- the additional brake and the transmission device use the same active gap and the same magnetorheological medium and preferably also at least partially the same conductive sections of the rotating components.
- a common effective gap is provided for the transmission device and the additional brake.
- the effective gap formed between the rotating components also provides the effective gap for the additional brake.
- the effective gap is formed all the way around one of the rotating components.
- the effective gap can have at least one or at least two or more gap sections.
- the magnetic field of the magnetic device can act on the same gap section and/or on another (adjacent) gap section of the effective gap.
- the gap sections are connected to one another and in particular are fluidly connected.
- the braking torque of the additional brake is referred to in the context of the present invention as the emergency braking torque.
- This also includes other possible uses of the braking torque, for example for braking in standby mode or when the transmission device is switched off or for amplifying a transmission torque of the transmission device.
- the transmission torque of the transmission device can be a braking torque or a clutch torque.
- the permanent magnet provides the magnetic field independently of a power supply to the additional brake and the coil device. It is possible for the permanent magnet to be provided by a material with suitable remanence properties so that it can be demagnetized and magnetized by a magnetic field (for example by means of the coil device). When a direction of the magnetic field is mentioned in the context of the present invention, this particularly means the direction of the magnetic flux (in particular in a magnetic circuit).
- the coil device is attached to one of the rotary components.
- the coil device and the at least one magnet unit are attached to different (opposite) rotary components.
- the coil device is not attached to the rotary component that has the separating gap.
- rotary components are at least partially designed to be magnetically conductive.
- the rotary components are at least partially made of a magnetically conductive material.
- rotary components are at least partially designed to be magnetically conductive where the magnetic circuit is provided.
- the magnetorheological medium is designed as a powder.
- the powder is absorbed in a gas and preferably in air.
- the magnetorheological medium comprises magnetically responsive (magnetizable) particles and gas as a filling medium.
- the magnetically responsive particles are absorbed in air.
- the magnetorheological medium is designed as a powder. With such a magnetorheological medium, the invention presented here enables a particularly low fundamental moment.
- the magnetorheological medium comprises magnetizable particles and a carrier liquid, such as oil, water or alcohol.
- the magnetizable particles consist predominantly of carbonyl iron powder or derivatives thereof.
- Other magnetically responsive particles are also possible.
- the magnetizable particles can have coatings to protect against abrasion and/or corrosion and/or additional components to make the magnetically responsive particles more durable, abrasion-resistant and/or slippery during operation.
- the magnetorheological medium can, for example, comprise a graphite additive.
- Figure 1 is a purely schematic representation of a device according to the invention in a sectional side view
- Figure 2 shows the device of Fig. 1 in a sectioned
- Figure 3 shows another device in a sectioned
- Figure 4 shows the device of Fig. 3 in a sectioned
- Figure 5 shows another device in a sectioned
- Figure 6 shows the device of Fig. 5 in a sectioned
- FIG. 7 and 8 Detailed representations of a device in different operating states in sectioned side views ;
- Fig. 9 and 10 show another device in different operating states in sectional side views
- Figure 11 is a detailed view of the device of Figure 3 in a perspective view
- Figure 12 shows another device in a sectioned
- Figure 13 shows the device of Fig. 12 in a sectioned
- Figure 14 shows an embodiment of the device of Fig. 12 in a sectional front view.
- Figures 1 and 2 show a device 100 according to the invention with a magnetorheological transmission device 1 with two rotary components 2, 3.
- the device 100 is designed here as a steering input device 300 for controlling a vehicle according to the steer-by-wire concept.
- one of the rotary components 2, 3 is connected to a steering unit 301 and, for example, a steering wheel.
- the transmission device 1 can thus generate haptic feedback on the steering unit 301 or engage the torque of a drive device not shown here.
- the device 100 can also be designed as a different type of operating device and, for example, as a rotary knob or thumb roller.
- an effective gap 4 is formed in which a magnetorheological medium 5 is arranged.
- the dimensions of the effective gap 4 are not drawn to scale here and in the other figures for reasons of visibility.
- a seal 14 is provided to seal the effective gap 4.
- the inner rotary component 2 is supported by a bearing unit 12 and, for example, one or several plain bearings are rotatably mounted on the outer rotary component 3.
- the outer rotary component 3 here comprises two transverse walls 63, which close off the effective gap 4 in the axial direction.
- the bearing unit 12 is arranged here on at least one transverse wall 63.
- the transverse walls 63 also serve in particular to seal the effective gap 4.
- a magnetic field is generated via a coil device 6 attached to the inner rotating component 2.
- the magnetic field influences the medium 5 so that the mobility of the rotating components 2, 3 is subjected to a targeted torque.
- the magnetically conductive sections of the rotary components 2, 3 that protrude into the effective gap 4 can be equipped with a circumferential contour. This results in a different gap height in the circumferential direction, with the elevations acting as magnetic field concentrators.
- the inner rotary component 2 is equipped with a star contour 24.
- An additional brake 7 with a magnetic device 17 serves to brake the rotation of the rotating components 2, 3 if the magnetic field of the coil device 6 is lost and, for example, in the event of a malfunction.
- the magnetic device 17 here comprises a magnet unit 27 with two permanent magnets 37.
- the magnetic field of the magnet unit 27 runs in a magnetic circuit 47 shown in dashed lines.
- the permanent magnets 37 here have an opposite polarization with respect to the radial direction.
- the magnetic circuit 47 also extends through the effective gap 4 and the medium 5, the rotation of the rotating components 2, 3 is thereby slowed down.
- the arrows show the flow direction of the magnetic field in the magnetic circuit 47.
- the dashed line within the permanent magnets 37 symbolically indicates the polarization of the permanent magnets 37.
- a separating gap 43 is formed in the rotating component 3.
- the separating gap 43 results in two component sections 53 that are magnetically decoupled from one another.
- the separating gap 43 extends in the radial direction between the component sections 53.
- the transverse walls 63 are preferably also designed to be non-magnetically conductive.
- a permanent magnet 37 of the magnet unit 27 is magnetically connected to each component section 53.
- the permanent magnets 37 are connected to one another by means of a connecting unit 8, so that the magnetic circuit 47 is closed.
- the connecting unit 8 is designed here as a bridge element 28.
- the magnet unit 27 forms here with its connecting unit 8 a magnetic circuit section 87, which provides part of the magnetic circuit 47.
- the magnetic circuit section 87 represents a bypass.
- the magnet unit 27 here extends only over a part of the circumference, which corresponds to an angle 37b of slightly less than 90°. This means that permanent magnets 37 can be used, which are considerably cheaper and easier to manufacture than, for example, ring magnets.
- the magnet unit 27 is attached to a radial outer side 13 of the outer rotary component 3.
- the magnet unit 27 can be mounted after the rotary components 2, 3 have been assembled and the effective gap 4 has been filled with the medium 5. This enables particularly economical and uncomplicated assembly.
- the magnet unit 27 and the rotary components 2, 3 as well as the effective gap 4 are arranged here so as to overlap in the radial direction.
- the permanent magnets 37 are here in direct contact with a receiving area 23 of the outer side 13 of the rotary component 3 For this purpose, they have a contact area 37a which follows the curvature of the receiving area 23 or the entire outer side 13 of the rotary component 3.
- the magnet unit 27 here has the basic geometry of a ring segment.
- the permanent magnets 37 are accordingly designed as ring segments.
- the bridge element 28 also follows the curvature of the permanent magnets 37 and is designed as a ring segment. This results in a very compact design overall, so that the diameter of the transmission device 1 is only increased insignificantly due to the additional brake 7.
- the additional brake 7 shown here offers a reliable braking torque in the event of a fault.
- the rotating components 2, 3 cannot be rotated without resistance in the event of a fault. Rotation without resistance could lead to excessive and therefore very dangerous steering movements in the steering control device 300.
- the magnetic field of the magnet unit 27 is specifically superimposed with a magnetic field of a counter-field generating device 57.
- the counter-field generating device 57 generates a magnetic field which is directed opposite to the magnetic field of the magnet unit 27.
- the counter field generating device 57 can be provided by the coil device 6 of the transmission device 1.
- the individual magnet unit 27 is only arranged on part of the circumference here. If its magnetic field is eliminated by the coil device 6, a braking torque is present. This is because if the magnetic field of the coil device 6 cancels out the magnetic field of the magnet unit 27 in the associated angular range, an effective magnetic field of the coil device 6 still remains in the remaining angular range of the circumference.
- the device 100 shown here can be equipped with an additional coil device 67, which is shown in more detail in Figures 7 and 8.
- the additional coil device 67 comprises an additional coil device 67, which is arranged here on the connection unit 8. If several magnet units 27 distributed asymmetrically over the circumference are provided, the additional coil device 67 comprises, for example, at least one additional coil 77 for each magnet unit 27.
- the additional coil 77 is integrated into the magnetic circuit 47 of the magnet unit 27.
- the additional coil 77 When the additional coil 77 is not energized (as shown in Figure 7), the course of the magnetic field in the magnetic circuit 47 is not influenced.
- the coil When the coil is energized (shown in Figure 8), it generates a magnetic field which is aligned opposite to the magnetic field of the magnet unit 27. This results in the magnetic circuit 47a shown in dashed lines in Figure 8 for the magnet unit 27 and the magnetic circuit 77a for the additional coil 77.
- the magnetic field of the magnet unit 27 is, so to speak, displaced from the magnetic circuit 47.
- the magnet unit 27 is equipped purely by way of example with only one permanent magnet 37. Accordingly, the bridge element 28 is designed such that it connects the permanent magnet 37 to the opposite component section 53.
- Such an embodiment can also be provided for the devices 100 of Figures 1 to 4.
- the device 100 presented in Figures 7 and 8 can also be equipped with a magnet unit 27 or a bridge element 28, as shown in Figures 1 and 2 or 3 and 4.
- Figures 3 and 4 show a variant of the previously presented device 100, in which a plurality of magnet units 27 distributed symmetrically over the circumference are provided. As a result, the magnetic field of the magnet device 17 can be can be completely eliminated by the magnetic field of the coil device 6. If an asymmetrical distribution of the magnet units 27 is provided, the magnet units 27 are preferably each equipped with an additional coil 77. The additional coil 77 then functions to eliminate the magnetic field of the magnet device 17 in particular as described with reference to Figures 7 and 8.
- the magnet units 27 each have two cuboid-shaped permanent magnets 37 with planar contact areas 37a.
- Figures 5 and 6 show a variant of the device 100 in which the magnet units 27 are distributed over the circumference and each have a cuboid-shaped permanent magnet
- the permanent magnets 37 have an axial polarization here.
- connection units 8 are provided for each magnet unit 27.
- the connection units 8 are designed here as holding elements 38, which are each conductively connected to a magnetic pole and each component section 53.
- holding elements 38 are designed to connect all magnet units 27. The holding elements are then
- the holding elements 38 each have a Fastening section 18 which is adapted to the curvature of the outer side 13 of the rotary component 3 in the receiving area 23 for the permanent magnets 37.
- This variant also enables the economical and advantageous use of cuboid-shaped permanent magnets 37.
- Figure 9 shows the device 100 of Figures 5 and 6 in normal operation.
- the coil device 6 of the transmission device 1 is active and generates a magnetic field which extends through a magnetic circuit 16 and is directed opposite to the magnetic field of the magnetic device 17.
- the magnetic field of the coil device 6 displaces the magnetic field of the magnetic device 17 from the effective gap 4. As a result, the accident braking torque can be completely eliminated.
- the magnetic field of the magnetic device 17 meanwhile flows through a magnetic circuit 47, which here extends at least partially through the component sections 53 and the separating gap 43.
- the magnetic circuit 47 can also extend at least partially through the air. This would then result in a magnetic circuit 47 which runs through the magnetic circuit section 87 and the air layers located radially further out from the magnetic circuit section 87. In principle, it is important for the elimination of the accident braking torque that the magnetic circuit 47 no longer runs through the effective gap 4. In addition, the magnetic circuit 16 of the coil device 6 should not run through the opposite rotating component 3.
- the device 100 of Figures 5 and 6 is shown in a normal operation, in which a particularly high Braking torque and/or particularly energy-saving operation are desired.
- the coil device 6 generates a magnetic field which runs in the same direction as the magnetic field of the magnetic device 17. This results in the magnetic circuit 16 shown here for the magnetic field of the coil device 6 and the magnetic circuit 47 for the magnetic device 17. Since both magnetic circuits 16, 47 run through the effective gap 4, both contribute to generating the braking torque.
- Figure 12 shows a variant of the device 100 in which the magnet unit 27 is arranged axially next to the rotary components 2, 3 and the active gap 4.
- the magnet unit 27 is here fastened to an axial outer side of the outer rotary component 3.
- the magnet unit 27 here has the basic geometry of a ring segment, so that it only extends over part of the circumference.
- the magnet unit 27 is designed analogously to the embodiment according to Figure 1. In principle, however, other magnet units 27 can also be used here, for example as described with reference to Figures 3 to 11.
- the separating gap 43 extends here in the axial direction between the component sections 53 and opens out on the axial outer side of the rotating component 3.
- at least the left transverse wall 63 is not designed to be magnetically conductive.
- Figure 13 shows the device 100 of Figure 12 in a front view cut along the dot-dash line.
- the hatching has not been shown for better clarity.
- the magnet unit 27 of the additional brake 7 is shown for illustration purposes, even if it is not in the cutting plane.
- the separating gap 43 is here continuous.
- a ring made of PTFE or another magnetically non-conductive material is arranged in the separation gap 43 and is firmly connected to the component sections 53 and glued, for example.
- Figure 14 shows a variant of the device 100 of Figure 13, in which the separating gap 43 is interrupted by connecting sections 73.
- the component sections 53 are connected to one another in a rotationally fixed manner by the connecting sections 73.
- the connecting sections 73 are web-like bridges which are connected in one piece to the component sections 53.
- the width or thickness of the bridges is chosen to be correspondingly small so that a reliable connection is guaranteed, but the bridges quickly experience magnetic saturation during operation. The bridges therefore do not have an adverse effect on the magnetic field of the additional brake 7.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Transportation (AREA)
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP24742834.5A EP4735308A1 (de) | 2023-06-30 | 2024-06-28 | Vorrichtung mit einer magnetorheologischen übertragungseinrichtung |
| CN202480043550.3A CN121666335A (zh) | 2023-06-30 | 2024-06-28 | 具有磁流变传输设备的装置 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102023117387 | 2023-06-30 | ||
| DE102023117387.1 | 2023-06-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2025003401A1 true WO2025003401A1 (de) | 2025-01-02 |
Family
ID=91950382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2024/068249 Ceased WO2025003401A1 (de) | 2023-06-30 | 2024-06-28 | Vorrichtung mit einer magnetorheologischen übertragungseinrichtung |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4735308A1 (de) |
| CN (1) | CN121666335A (de) |
| DE (1) | DE102023117489A1 (de) |
| WO (1) | WO2025003401A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102024131748A1 (de) * | 2024-10-30 | 2026-04-30 | Schaeffler Technologies AG & Co. KG | Lenksystem mit magnetorheologischer Bremse und Permanentmagnetunterstützung |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013204655A (ja) * | 2012-03-28 | 2013-10-07 | Kurimoto Ltd | 回転制動装置 |
| DE102019207683A1 (de) * | 2019-05-25 | 2020-11-26 | Robert Bosch Gmbh | Magnetorheologische Einrichtung |
| DE102020204723A1 (de) * | 2020-04-15 | 2021-10-21 | Zf Friedrichshafen Ag | Antrieb mit Dämpfungs- oder Bremsfunktion |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2930655B1 (fr) * | 2008-04-29 | 2013-02-08 | Commissariat Energie Atomique | Interface a retour d'effort a sensation amelioree |
| DE102016212567A1 (de) * | 2016-07-11 | 2018-01-11 | Schaeffler Technologies AG & Co. KG | Vorrichtung zur Positionssicherung einer Motorwelle eines Elektromotors, Elektromotoranordnung und Verfahren zu deren Betrieb |
| EP4259511B1 (de) * | 2020-12-12 | 2025-02-19 | INVENTUS Engineering GmbH | Lenkeinrichtung mit einer magnetorheologischen bremseinrichtung und verfahren zum betreiben einer lenkeinrichtung |
| DE102022115076A1 (de) * | 2022-06-15 | 2023-12-21 | Signata GmbH | Stellvorrichtung für ein Fahrzeug und Verfahren zum Betreiben einer Stellvorrichtung |
| DE102022115087A1 (de) * | 2022-06-15 | 2023-12-21 | Signata GmbH | Sperrvorrichtung für eine Betätigungseinheit für ein Fahrzeug, Betätigungseinheit und Verfahren zum Betreiben einer Sperrvorrichtung |
| DE102022121666A1 (de) * | 2022-06-27 | 2023-12-28 | Inventus Engineering Gmbh | Vorrichtung mit einer magnetorheologischen Übertragungseinrichtung |
-
2023
- 2023-07-03 DE DE102023117489.4A patent/DE102023117489A1/de active Pending
-
2024
- 2024-06-28 EP EP24742834.5A patent/EP4735308A1/de active Pending
- 2024-06-28 WO PCT/EP2024/068249 patent/WO2025003401A1/de not_active Ceased
- 2024-06-28 CN CN202480043550.3A patent/CN121666335A/zh active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013204655A (ja) * | 2012-03-28 | 2013-10-07 | Kurimoto Ltd | 回転制動装置 |
| DE102019207683A1 (de) * | 2019-05-25 | 2020-11-26 | Robert Bosch Gmbh | Magnetorheologische Einrichtung |
| DE102020204723A1 (de) * | 2020-04-15 | 2021-10-21 | Zf Friedrichshafen Ag | Antrieb mit Dämpfungs- oder Bremsfunktion |
Also Published As
| Publication number | Publication date |
|---|---|
| CN121666335A (zh) | 2026-03-13 |
| DE102023117489A1 (de) | 2025-01-02 |
| EP4735308A1 (de) | 2026-05-06 |
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