EP3857079A1 - Dispositif de support, dispositif de réglage, colonne de direction réglable, procédé pour la fabrication d'un dispositif de réglage - Google Patents

Dispositif de support, dispositif de réglage, colonne de direction réglable, procédé pour la fabrication d'un dispositif de réglage

Info

Publication number
EP3857079A1
EP3857079A1 EP19778491.1A EP19778491A EP3857079A1 EP 3857079 A1 EP3857079 A1 EP 3857079A1 EP 19778491 A EP19778491 A EP 19778491A EP 3857079 A1 EP3857079 A1 EP 3857079A1
Authority
EP
European Patent Office
Prior art keywords
bearing
bearing device
drive element
drive
section
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.)
Pending
Application number
EP19778491.1A
Other languages
German (de)
English (en)
Inventor
Sebastian Huber
Arne Schacht
Jean-Pierre Specht
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp AG
ThyssenKrupp Presta AG
Original Assignee
ThyssenKrupp AG
ThyssenKrupp Presta AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ThyssenKrupp AG, ThyssenKrupp Presta AG filed Critical ThyssenKrupp AG
Publication of EP3857079A1 publication Critical patent/EP3857079A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
    • B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
    • B62D1/16—Steering columns
    • B62D1/18—Steering columns yieldable or adjustable, e.g. tiltable
    • B62D1/181—Steering columns yieldable or adjustable, e.g. tiltable with power actuated adjustment, e.g. with position memory
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/10—Sliding-contact bearings for exclusively rotary movement for both radial and axial load
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C21/00—Combinations of sliding-contact bearings with ball or roller bearings, for exclusively rotary movement
    • F16C21/005—Combinations of sliding-contact bearings with ball or roller bearings, for exclusively rotary movement the external zone of a bearing with rolling members, e.g. needles, being cup-shaped, with or without a separate thrust-bearing disc or ring, e.g. for universal joints
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
    • F16C25/02—Sliding-contact bearings
    • 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
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • 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
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F16H57/022—Adjustment of gear shafts or bearings
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/20—Land vehicles
    • F16C2326/24—Steering systems, e.g. steering rods or columns
    • 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
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H2025/2062—Arrangements for driving the actuator
    • F16H2025/2084—Perpendicular arrangement of drive motor to screw axis
    • 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
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H2025/2062—Arrangements for driving the actuator
    • F16H2025/209—Arrangements for driving the actuator using worm gears
    • 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
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F16H2057/0213—Support of worm gear shafts
    • 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
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F16H57/022—Adjustment of gear shafts or bearings
    • F16H2057/0221—Axial adjustment

Definitions

  • the present invention relates to a storage device for a
  • the present invention relates to an adjusting device for a steering column for a motor vehicle, comprising a drive element which is mounted rotatably about an axis of rotation in a bearing opening of a bearing device, the bearing device in a bearing seat of a
  • Gearbox housing is received, wherein the bearing device has a support portion which cooperates with the bearing seat such that the support portion is biased.
  • the present invention relates to an adjustable steering column for a motor vehicle, comprising one with a chassis
  • Carrier unit which can be connected to a motor vehicle and an actuating unit held on the latter, which rotatably supports a steering spindle, the position of the actuating unit being adjustable relative to the supporting unit, comprising an adjusting device for converting a drive movement into an adjusting movement which can be transmitted to the adjusting unit, the adjusting device being effective with the Carrier unit and the actuator is connected.
  • the present invention relates to a method for producing an adjusting device for a steering column for a motor vehicle.
  • Steering columns of the type mentioned at the outset which comprise a support unit which can be connected to the chassis of the motor vehicle, for example in the form of console parts, and an actuating unit which is held on this support unit and is adjustable relative to this support unit.
  • the Actuator unit stores a steering spindle, which is used to initiate a
  • Known adjustment devices of the type mentioned at the outset are typically driven by an electric motor, by means of which a comfortable adjustment of the actuating unit relative to the support unit can be achieved and which also enable repeated storage of positions when several drivers operate the motor vehicle.
  • the threaded spindle can be driven by the gear wheel or the motor shaft so as to rotate about its threaded spindle axis, in that the thread play is non-rotatably connected to a second gear wheel which engages with the gear wheel of the motor shaft, and engages in the spindle nut which is attached to the carrying unit or alternatively, is fixedly attached to the actuating unit with respect to a rotation about the threaded spindle axis.
  • the threaded spindle In the direction of a threaded spindle axis, the threaded spindle is supported on the supporting unit or the actuating unit, and the spindle nut correspondingly on the adjusting unit or alternatively on the supporting unit, so that a rotary drive of the threaded spindle causes an adjusting movement of the spindle nut, the adjusting movement a
  • Execution is therefore also referred to as a rotary spindle drive.
  • the gear wheel of the motor shaft can be used, for example, as a worm
  • the threaded spindle is non-rotatably coupled to the support unit or alternatively to the actuating unit with respect to a rotation about its threaded spindle axis
  • Spindle nut is rotatable, but is fixed in the direction of the threaded spindle axis accordingly on the adjusting unit or alternatively on the support unit.
  • the threaded spindle is supported on the in the direction of the threaded spindle axis Support unit or on the actuator unit, and the spindle nut
  • Spindle nut which is in engagement with the threaded spindle, can be designed on its outside as a worm wheel, in the
  • Gearing engages the gear wheel of the motor shaft, which is designed as a worm.
  • An adjusting device of the type mentioned at the outset is known, for example, from DE 10 2017 206 551 A1, in which a worm, which is fastened on a motor shaft, engages in a worm wheel, that is, it engages
  • Worm gear is formed so that a submerged spindle drive or a rotary spindle drive is driven by a rotation of the motor shaft or the worm, that is to say the rotary movement of the motor shaft is converted into a linear adjustment movement.
  • the bearing device then comprises a housing cover in which the motor shaft is mounted.
  • Example 10 if a desired position of the actuating unit is determined iteratively by a vehicle driver by moving the actuating unit back and forth by driving the known adjusting device and repeating this several times, this results in a deflection of the motor shaft by a predetermined one for driving the adjusting device, because advantageous arrangement of the motor shaft and acoustic noise.
  • the bearing of the motor shaft is disadvantageous.
  • the object of the present invention is to provide a bearing device of the type mentioned, an adjusting device of the type mentioned, an adjustable steering column of the type mentioned and a method of the type mentioned by which the disadvantages of the prior art are avoided.
  • this object is achieved with respect to the bearing device in that the bearing device has a first end and a second end opposite it, a bearing opening for the rotatable mounting of a drive element of the adjusting drive, which
  • Bearing device extends into it to form a support section, which is connected to the bearing section.
  • the bearing device is designed as a bearing bush with a preferably round cross section.
  • The is preferably
  • the bearing device according to the invention is particularly advantageous from the point of view that the drive element, for example a
  • Motor shaft of an electric motor in particular such a motor shaft with a gear wheel, in particular a worm, against faults, such as on an adjusting device and / or an adjustable steering column, with which the bearing device according to the invention is effective can be or is connected, acting vibrations and / or
  • Counteracting drive elements provided storage, so that, for example, a predetermined, because optimal engagement of the drive element in a gear element of a spindle drive (rotary spindle drive and / or replacement spindle drive) is maintained in a variety of operating conditions, for example, because a correspondingly large biasing force the said deflection completely or almost completely suppressed.
  • the drive element is designed as a shaft, in particular a shaft with a gear wheel, such as a worm, axial and / or radial deflections come into consideration,
  • the biasing force preferably counteracts the axial and / or the radial deflection.
  • the prestressing force acts in an axial direction and / or in a radial direction with respect to the longitudinal axis of the shaft, that is to say in the direction of the longitudinal axis of the shaft and / or in a direction orthogonal to the longitudinal axis / axis of rotation of the shaft.
  • driven state means in particular that the drive element is provided by a drive means, for example one
  • Electric motor in particular a servomotor, is driven, that is, in the case of an embodiment as a motor shaft, it carries out a rotary movement about a corresponding shaft axis, that is to say the longitudinal axis of the shaft.
  • the bearing section has a bottom section.
  • the base section preferably has a projection, particularly preferably a concentric projection. This is advantageous because the drive element is in contact with the bottom section via the projection in a driven state, after which a correspondingly average friction diameter is reduced, so that the friction between the drive element and the bearing device is reduced. This is particularly advantageous if the bearing device is mounted axially biased against the drive element.
  • the recess is annular.
  • the recess then preferably surrounds the bearing opening in a ring shape, preferably the recess and the bearing opening are arranged or can be arranged concentrically.
  • the recess is particularly preferably shaped such that the bearing device is in a longitudinal section, for example along an axis of rotation of the
  • the bearing device has a wall thickness (s), the
  • Recess has a volume whose value is greater than the cubic wall thickness.
  • the cubic wall thickness is the value of the wall thickness multiplied three times by itself.
  • the wall thickness is preferably a maximum wall thickness or an average wall thickness, and the wall thickness is particularly preferably a minimum wall thickness of the bearing device.
  • the support section has at least one projection.
  • the bearing section has at least one recess. In a further advantageous embodiment of the bearing device according to the invention, it comprises a plastic.
  • bearing device in a further advantageous embodiment, it is a one-piece integral component.
  • Embodiments is formed. This is advantageous because of a quiet and precise conversion, for example one
  • Rotary movement of the drive element in particular in the case of an embodiment as a motor shaft of an electric motor.
  • the drive element is preferably elastically preloaded by the bearing device according to the invention.
  • Drive element is mounted elastically biased, for example by a restoring means, in particular a spring element, is advantageously one against a change in shape and / or shape of the
  • the drive element is supported by a bearing force caused by an elastic preload, preferably by a radial and / or axial preload caused by a bearing force.
  • the drive element is adaptively mounted in a certain range with regard to a change in shape and / or shape of the drive element, so that it is securely mounted for a large number of cases
  • Moisture and / or thermal expansion and / or heat shrinkage and / or an elastic / plastic / elastic-plastic deformation and / or abrasion of the drive element is meant.
  • Deflection of the drive element is resettable and / or counteracted by a restoring means, in particular a spring element, in particular on and / or in a portion of the drive element spaced from the drive means, for example a portion remote from the motor.
  • a restoring means in particular a spring element, in particular on and / or in a portion of the drive element spaced from the drive means, for example a portion remote from the motor.
  • the drive movement is designed to be a rotary movement about an imaginary axis of rotation and the bearing device for preloaded mounting of the drive element along the axis of rotation.
  • the drive element is designed as a shaft, in particular a motor shaft, because then a deviation, in particular a deflection, preferably a translatory deflection, particularly preferably an axial translational deflection, is counteracted by the rotary movement in the axial direction.
  • the drive element is prestressed by pressure, preferably elastically prestressed.
  • the drive element is preloaded, elastically preloaded or elastically pressure-preloaded by the bearing device according to the invention in such a way that it is pressed (pressed) against the drive means, preferably a servomotor, in the driven state. It is preferably located
  • the axis of rotation can also be referred to as the axis of rotation of the drive element.
  • the bearing section of the bearing device forms a bearing means for the sliding bearing of the
  • Drive elements in particular a bearing means designed as a radial bearing for slidingly mounting the drive element.
  • a rolling element-free radial bearing in particular a sliding bearing, which can be realized in the case of the drive element being designed as a shaft, a radial deflection by a positive fit with the shaft, preferably a motor shaft of an electric motor , for example, a portion or area of a plain bearing supporting the shaft is as one the shaft there spatially-physically surrounding sleeve and / or socket, so preferably as a hollow cylinder or a bowl with a bottom portion and a blind hole.
  • Storage device are in particular one or more plastics, but also or alternatively one or more
  • the bearing device is particularly preferably formed from a plastic.
  • the storage device is an injection molded part.
  • the bearing device can be arranged in a force-fitting manner with respect to the drive element, in particular in a bearing seat of a housing which is at least partially accommodated by the adjusting device, so that the
  • the bearing device can also be arranged, that is to say, mounted, that is, the bearing seat encompassed by the aforementioned housing, which corresponds to the transmission housing, without further measures for interacting with the drive element.
  • the Storage device can be arranged non-positively with respect to the drive element, the drive element is so far also movably mounted, in particular in the case of a configuration of the drive element as Motor shaft.
  • the bearing seat is preferably designed as an opening, particularly preferably as an at least partially circular cylindrical opening or bore.
  • the bearing device is elastically deformable, in particular the support section, so that it can be stored essentially elastically reversibly in the bearing seat mentioned. Thereafter, for example, the bearing device can be preloaded elastically in the radial direction, for example, so that the bearing device in an assembled state by a corresponding force resetting the elastic deformation, for example against a force
  • Bearing device in the bearing seat in relation to the drive element designed as a motor shaft is self-centering in the radial direction or is designed to be self-centering.
  • the storage device is for
  • the bearing device preferably has one or more recesses in a section provided for storing the drive element, in particular the bearing section subsequently has the described recess, preferably channel-shaped recesses, in particular one or more grooves or pockets, for storing and / or transporting lubricant on and / or in the contact area, so that the contact area is supplied with lubricant during the execution of the drive movement, which results in low-friction and thus low-maintenance and low-wear operation of the invention
  • the Bearing section also have so-called lubrication pockets.
  • the lubricant is preferably designed as grease.
  • the bearing device is mounted such that it can be preloaded against the drive element.
  • the bearing device is preferably mounted in the axial direction against the drive element designed as a motor shaft, so that it is particularly preferably pressed against an end face of such a shaft on a (remote) section of the motor shaft that is spaced apart from the drive means, in particular a servomotor.
  • the bearing device is preferably mounted such that it can be preloaded elastically, that is to say in the sense of a spring in which the support section is preloaded by joining into the bearing seat.
  • one is elastic
  • preloadable clamping means for preloading the bearing device against the drive element.
  • the tensioning means is preferably in the form of a ring, for example as a prestressing ring or retaining ring, or in the form of a disk, for example as a prestressing disk or holding washer. This is particularly advantageous when the clamping means is to interact with the bearing device. It is also advantageous if the clamping means has at least one
  • the bulge is particularly effective
  • the drive element advantageously as a spring element by means of which a prestressing force can be exerted on the drive element, for example in the sense of a plate spring.
  • changes in length of the drive element can be compensated particularly well by means of an elastic deformation of the bulge, in particular in the axial direction if the drive element is designed as a motor shaft.
  • the bulge contacts or can be arranged contacting the drive element and / or the bearing device with a convex side defined by the shape of the bulge.
  • the tensioning means can preferably be in the form of a tongue
  • Projections can be formed or include those that are elastically biased when joining into the bearing seat.
  • the clamping means is designed to be self-locking. This is advantageous because, for example, the clamping means can be arranged in a bearing seat for applying a pretensioning force in a predetermined position without constructive or other measures having to be taken with regard to the bearing seat in order to mount the clamping means there. This is realized, for example, in that the tensioning means transversely to a direction along which the prestressing force is to be applied or can be applied, for example a prestressing force for an axially-elastic pressure state of the drive element in the case of a configuration as a motor shaft,
  • a mechanical anchoring can be realized in that the clamping device in an assembled state due to a resilient elastic deformation of the clamping means is pressed against a bearing seat, in particular radially, it being particularly advantageous if the clamping means partially penetrates into an inner wall of the bearing seat, for example due to a corresponding choice of material and / or radial prestressing force if the clamping means has a higher hardness (for example according to Vickers) at least in an area provided for assembly in the bearing seat than a corresponding area of the bearing seat.
  • a surface structure of the tensioning means that is particularly well suited for such clawing and / or anchoring is meandering. This embodiment is particularly advantageous from the aspect that the clamping means as a ring or disc
  • the clamping means can have radially protruding retaining tongues which are preloaded radially when the clamping means is received in the bearing seat.
  • the bearing device has a contact section for non-positive contact with a support section provided for mounting the bearing device, at least one projection being provided on an outer circumference of the contact section.
  • the bearing device can only be displaced in an axial direction with respect to a deflection of the drive element when a predetermined friction force due to the existing excess is exceeded, in particular if the drive element is a motor shaft an electric motor is configured.
  • the protrusion or the protrusions can in this case in particular by a thread turned in and / or on the outer circumference with one or more thread turns and / or by knurling, in particular in the case of a bearing means designed as a radial bearing, in particular a sliding bearing, a corresponding longitudinal knurling (in the axial direction of the radial bearing) and / or transverse knurling (extending in the circumferential direction of the radial bearing), or be formed by a combination thereof.
  • the projection or the projections can also be shaped like a knob.
  • An advantage of the projections described is that the bearing device can be moved, for example, with a constant force, in particular in the axial direction with respect to the
  • Motor shaft configured drive elements, so that a bearing play can be set via a corresponding force control.
  • Said projections can in particular partially or completely deform elastically, plastically or elastically-plastically in the assembled state of the bearing device.
  • the support section can in particular be designed as a spring bar.
  • a radial biasing force on the drive element can preferably be provided by the projection or the projections. Thanks to the at least one projection, the bearing device is radially preloaded when it is received in the bearing seat, the
  • Bearing device has an enveloping circle diameter that is larger than the diameter of the bearing seat.
  • the bearing means when mounting the bearing device in the bearing seat, the bearing means is preferably preloaded radially, so that the bearing means counteracts a deflection of the drive element in the radial direction.
  • the tensioning means exerts a prestressing force on the contact section in a tensioned state. This is advantageous because it reduces a frictional force caused by the prestressing force, in particular in the axial direction, with respect to the drive element, in particular if the drive element is designed as a motor shaft.
  • the tensioning means cooperates with the support section in such a way that a prestressing force is entered into the bearing device in the radial direction and in the axial direction.
  • the tensioning means in a tensioned state is a biasing force, preferably a radial and / or axial biasing force, which is exerted on a support section of the bearing device that at least partially accommodates the drive element. This is advantageous because it maximizes the pretensioning force that acts effectively on the drive element.
  • the object is achieved in that the adjusting device is configured as a component group according to one of the appended claims and / or according to the embodiments disclosed here. This is advantageous because of a
  • Rotary movement of the drive element in particular in the case of a configuration as a motor shaft of an electric motor, is implemented on the actuating unit, so that the adjusting movement is transmitted to the actuating unit in an improved manner by operating the adjusting device, which increases the overall ease of use of the steering column.
  • the object is achieved in that at least the following steps are carried out: a) providing a drive element which can be driven to carry out the drive movement; b) providing a bearing device for preloaded storage of the drive element according to one of the appended claims and / or embodiments disclosed here; c) providing a gear housing comprising a bearing seat; d) Positioning the drive element relative to the bearing seat and joining the bearing device into the bearing seat, so that the drive element is supported in a preloaded manner by the bearing device.
  • Adjusting device is produced, for example consisting of a motor shaft and a bearing device according to the invention, the drive element, in particular in the case of a configuration as
  • Drive elements is mounted counteracting, especially in the event that the drive element is in the driven state.
  • Steps a) and b) can of course be carried out in any order.
  • a force-controlled pretensioning is preferably carried out in step d).
  • a clamping ring is preferably used for the bearing device to be mounted pretensioned against the drive element by the clamping ring being arranged in the bearing seat in such a way that it exerts an axial pretensioning force on one end of the
  • a flexible bearing and / or change in shape of the drive element is produced. Furthermore, this measure provides a bearing which resets a deflection of the drive element.
  • the drive element is preferably preloaded along the axis of rotation with respect to the drive movement, which is, for example, a rotational movement about an imaginary axis of rotation, particularly preferably elastically preloaded, more preferably
  • the drive element is mounted in a preloaded manner such that it is elastically preloaded or elastically pressure-preloaded in such a way that it is pressed (pressed) against the drive means, preferably a servomotor, in the driven state.
  • the drive element is preferably in an essentially axial pressure state along the axis of rotation.
  • step b) the bearing device is provided with a bearing device provided for the sliding mounting of the drive element, and the drive element in step d) is provided by the
  • Bearing device in and / or on the drive element, for example if the drive element is a motor shaft of an electric motor
  • the bearing device is configured, positioned at an end of the motor shaft spaced from the electric motor, so that the bearing device accommodates a section of the drive element that is to be appropriately supported.
  • the bearing device is preferably arranged in a force-fitting manner, so that if a deflection of the
  • step b) the bearing device is provided with an elastically pretensionable tensioning means and in step d) the pretensioning is carried out by tensioning the tensioning means against the bearing device.
  • an adjusting device is manufactured in such a way that in the bearing seat, which at least partially surrounds the drive element spatially, the bearing device is first positioned on the drive element for storing the drive element and then the clamping means is positioned in the bearing seat, and then, preferably force-controlled, is biased so that the
  • Bearing device is elastically biased against the drive element.
  • the drive element is driven in step d). This is advantageous because a bearing clearance that is adapted to the driven state of the drive element can advantageously be set.
  • the drive element is preferably driven by an electric motor.
  • the (further) prestressing is ended in step d) when an operating variable of a drive means reaches a predetermined value.
  • the predetermined value of the operating variable can be an electrical current and / or an electrical voltage and / or or act as a braking torque of an electric motor, in particular a servomotor.
  • the adjusting device preferably comprises one or more rolling elements, the rolling element or elements being arranged between the bearing section and the drive element.
  • the rolling elements are thus at least partially arranged within the bearing opening.
  • the rolling elements are preferably accommodated in a cage.
  • the rolling elements are preferably designed as needles or as cylindrical rollers. Alternatively, balls can also be used as rolling elements.
  • Figure 1 is a schematic perspective view of a
  • Figure 2 the steering column of Figure 1 in a schematic
  • Figure 3 the steering column of Figure 1 in a further schematic perspective side view
  • Figure 4 an adjustment device according to the invention
  • Figure 6 the adjustment device according to Figure 4 in a partial
  • FIG. 7 shows a cross section through the adjusting device according to FIG. 4;
  • Figure 8 a storage device according to the invention in a
  • FIG. 10 a cross section through the bearing device according to FIG. 8;
  • Figure 11 a cross section through an inventive
  • Figure 12 a storage device according to the invention in a
  • FIG. 13 a cross section through the bearing device according to FIG. 12;
  • Figure 14 a cross section through an inventive
  • Bearing device is mounted according to a further embodiment
  • Figure 15 a cross section through an inventive
  • Figure 16 shows a cross section through an inventive
  • Figure 17 a cross section through an inventive
  • Figure 1 shows a steering column 1 according to the invention in a schematic perspective view from top right obliquely to the rear end, based on the direction of travel of a vehicle, not shown, where a steering wheel, not shown here, is held in the operating area.
  • Figures 2 and 3 show the steering column 1 according to the invention in
  • the steering column 1 comprises a support unit 100, which is designed as a console, which has fastening means 102 in the form of fastening bores for attachment to one
  • An actuating unit 16 is held by the support unit 100 and is also in a jacket unit 104
  • the actuating unit 16 has a casing tube 12 in which a
  • Steering spindle 14 is rotatably mounted about a longitudinal axis L which extends axially in the longitudinal direction, ie in the direction of the longitudinal axis L. At the rear end, there is a fastening section 141 on the steering spindle 14 formed on which a steering wheel, not shown, can be attached. At the front end, the steering shaft 14 with a fork
  • the actuating unit 16 is telescopic in order to implement a longitudinal adjustment in the jacket unit 104 in the direction of the longitudinal axis L.
  • the jacket unit 104 is mounted in its front end region about a horizontal pivot axis 106 lying transversely to the longitudinal axis L in a pivot bearing 22 on the support unit 100. In the rear area, the jacket unit 104 is connected to the support unit 100 via a rotatable adjusting lever 181. By rotating the
  • Adjusting lever 181 by means of an illustrated adjusting device 2 ′ according to the invention (see side views of FIGS. 2 and 3)
  • the jacket unit 104 can be pivoted relative to the support unit 100 about the pivot axis 106 lying horizontally in the installed state, as a result of which a steering wheel attached to the fastening section 141 can be adjusted in the height direction Z, which is indicated by the double arrow Z.
  • a first adjustment device 2 for longitudinal adjustment of the actuating unit 16 relative to the jacket unit 104 in the direction of the
  • Longitudinal axis L has a spindle drive with a spindle nut 51 with an internal thread, in which a threaded spindle 4 engages along the threaded spindle axis, that is, with its external thread, is screwed into the corresponding internal thread of the spindle nut 51.
  • the threaded spindle axis of the threaded spindle 4 runs essentially parallel to the longitudinal axis L.
  • the spindle nut 51 is rotatably mounted about the threaded spindle axis in a gear in a gear housing 34 which is fixedly connected to the casing unit 104.
  • the spindle nut 51 In the direction of the threaded spindle axis, which is also referred to in the following as the gear axis, the spindle nut 51 is supported axially via the gear housing 34 on the jacket unit 104, as will be explained in more detail below.
  • the threaded spindle 4 is connected to a fastening element 54 formed at its rear end via a transmission element 120 with the actuating unit 16, specifically in the direction of FIG
  • the transmission element 120 extends from the actuating unit 16 through a slot-shaped passage opening 110 in the casing unit 104. To adjust the steering column 1 according to the invention in the longitudinal direction, the transmission element 120 can be freely moved in the passage opening 110 in the longitudinal direction.
  • the adjusting device 2 has an electric servomotor 20, of which the spindle nut 51 with respect to the
  • the threaded spindle axis can be driven to rotate relative to the threaded spindle 4 which is fixed in the direction of rotation. This can - depending on
  • Adjustment device 2 ' according to the invention for adjustment in
  • This adjusting device 2 ' according to the invention comprises one
  • Adjustment device 2 ' according to the invention has a gear in which the threaded spindle 4' in a gear housing 34 ', which is fastened to the casing unit 104, by a corresponding one
  • Threaded spindle axis rotatably and axially, in the direction of
  • Threaded spindle axis is supported on the jacket unit 104.
  • the threaded spindle 4 ′′ can be driven to rotate in both directions of rotation about the threaded spindle axis by an electric servomotor 20 ′′.
  • the spindle nut 3 ’ is about a rotation about
  • the threaded spindle axis is fixedly attached to one end of the two-armed actuating lever 181, which is mounted on the support unit 100 so as to be rotatable about a pivoting mechanism 18 about a hinge axis 183, and the other arm of which is connected to the jacket unit 104 at the other end.
  • the spindle nut 3 ' is connected to an actuating lever 181 via a joint 182.
  • the adjusting lever 181 is pivotable in a hinge axis 183 on the jacket unit 104 and in one
  • Joint axis 184 attached to the support unit 100. This ensures that a corresponding adjustment is applied to the pivoting mechanism 18 and thus to the actuating unit 16 and the casing unit 104 via the threaded spindle 4 '. For a required Length compensation is appropriate in one of the joints
  • Elongated hole recording of a bolt forming the pivot axis 106 is realized in the pivot bearing 22.
  • Threaded spindle axis are displaced translationally relative to the threaded spindle 4 ′′, so that accordingly the jacket unit 104 connected to the spindle nut 3 ′′ via the actuating lever 181 together with the actuating unit 16 accommodated therein relative to the support unit 100 in
  • Height direction Z can be adjusted up or down, as with the
  • Sheath unit 104 can be pivoted about pivot axis 106 relative to support unit 100.
  • a so-called rotating spindle drive is realized by the rotating spindle 4 ’and the spindle nut 3’, which is fixed with respect to rotation.
  • the spindles 4 and 4 'each have a mechanical end stop 5 to ensure a predefined adjustment range.
  • the adjustment devices 2 and 2 'according to the invention essentially differ only in that the transmission housing 34
  • Threaded spindle 4 is arranged to be driven in rotation.
  • FIG. 4 shows the adjusting device 2 according to the invention in a state detached from the steering column 1 according to the invention.
  • FIG. 5 functional parts of a bearing device according to the invention, which are essential to the invention, are shown in an exploded view.
  • the adjusting device 2 has a housing 921.
  • the housing has a bearing seat 200, in which a drive wheel designed as a worm 922 is rotatably mounted, which is on a
  • the screw 922 is preferably by means of a
  • the screw 922 is preferably inductively heated prior to a joining operation for joining with the drive shaft 923 and then with little force being exerted on the
  • worm 922 can also be attached to the drive shaft 923 pushed on, so that worm 922 shrinks on drive shaft 923 after cooling.
  • the worm 922 can also be attached to the
  • Drive shaft 923 are attached, whereby heat input into the screw can be avoided, for example, to avoid starting the material.
  • the drive shaft 923 is of that
  • Actuator 20 can be driven in rotation, the motor shaft of which
  • the servomotor 20 is on the housing 921
  • Bearing device 202 is rotatably mounted in the bearing seat 200, and in its area close to the motor in a motor bearing 925, which is also fixed in the housing 921 together with the servomotor 20.
  • Bearing device 202 is pressed elastically against the drive shaft 923 by a clamping ring 201, so that the drive shaft 923 is elastically pressure-preloaded in the axial direction and at the same time is radially slidably supported at its end remote from the motor by the bearing device 202, in particular if the drive shaft 923 is driven by the servomotor 20 .
  • the drive shaft 923 has an axis of rotation, the axial
  • Direction is synonymous with the direction of the axis of rotation.
  • Bearing device 202 comprises a first end 220 and a second end 222 opposite this, a bearing opening 208 which rotatably supports the drive shaft 923 of the adjustment drive and which extends from the first end 220 into the bearing device 202 to form a bearing section 310, one of which Recess 306 is provided, which extends from the second end 222 into the bearing device to form a support section 206, 214, which is connected to the bearing section 310.
  • the bearing device 202 has one at the second end 222
  • the bearing device 202 has an annular recess 306.
  • the drive shaft 923, the worm 922, the bearing device 202 and the clamping ring 201 are in a bearing seat 200 of the housing 921 in the axial direction
  • the bearing device 202 forms a bearing device according to the invention.
  • the bearing device 202, the clamping ring 201 and the drive shaft 293 form a component group.
  • the clamping ring 921 is supported against a wall 203 of the
  • Drive shaft 923 that is along the longitudinal axis of the drive shaft, is elastically biased in the radial direction such that the
  • Tension ring 201 partially penetrates into wall 203. Speak the
  • Tension ring 201 is immovably mounted in the bearing seat 200 with respect to a displacement in the axial direction, in particular against a deflection of the bearing device 202 and thus the motor shaft 923 in the direction of the tension ring 201 up to a predetermined axial force.
  • the tension ring 201 is moved axially toward the drive shaft 923 when the tension ring 201 is mounted in the bearing seat 200 by the tension force increase in the sense of a preloaded spring, or vice versa axially spaced from the drive shaft 923 to reduce the preload force.
  • Bearing device 202 is mounted, the drive shaft 923 in the radial direction by a through the bearing device 203 with the
  • Drive shaft 923 formed positive locking against a radial deflection of the drive shaft 923.
  • the bearing device 202 acts as a radial fixing means with respect to the drive shaft 923
  • Bearing device 202 is mounted in the bearing seat 203 in a radially elastically prestressed manner with respect to the longitudinal axis of the drive shaft 923 by the support section 206, that is to say non-positively, so that due to a corresponding resetting of an elastic deformation in radial direction Direction, i.e. in a direction orthogonal to the axis of rotation of the drive shaft 923, is supported against the wall 203 and is movably supported in the axial direction by an axial force dependent on the elastic stress state, i.e. a force overcoming a corresponding frictional force, for example in the event of thermal expansion of the drive shaft 923 in the axial direction. It can be seen particularly well in FIG.
  • the bearing device 202 has a bearing section 310 in which a section of the drive shaft 923 is received. Furthermore, it can be seen particularly well from FIG. 7 that the bearing device is W-shaped due to the recess 306.
  • Bearing device 202 are mounted elastically biased, is produced as follows (see in particular the partial exploded view of Figure 5): the bearing device 202 is inserted in the bearing seat 200 in the radial direction elastically biased in the axial direction until the bearing device 202 for receiving the end remote from the engine
  • the clamping ring 201 is closer (higher clamping force) or further away (lower clamping force) with respect to the far end of the drive shaft 923 in the bearing seat 200
  • the drive shaft 923 can be driven by the servomotor 20, that is to say execute a rotary movement about its corresponding shaft axis (longitudinal axis).
  • the person skilled in the art is aware of the elastic springback of the tensioning ring 202 when it is relieved, that is to say when the prestressing process described is ended, which can be taken into account in the production of the bearing described.
  • the housing 34 of the adjusting device 2 is tubular, hollow-cylindrical, coaxial with the
  • Threaded spindle 4 formed.
  • the housing 34 is a
  • Worm gear 912 designed gear wheel rotatably mounted.
  • the worm wheel 912 is non-rotatably connected to the spindle nut 51 via a cylindrical connecting element 204. Through an engagement of a worm thread of the worm 922 in the worm wheel 912, the latter is rotated by the drive shaft 923 in the event of a corresponding operating state of the servomotor 20
  • Housing 34 includes one
  • connection section 341 for coupling to a steering column 1.
  • the connection section 341 is designed as an outwardly curved projection which is introduced into the housing 34 by means of a reshaping operation.
  • the connection section 341 can be a buffer element made of a plastic or an elastomer, which is designed as a cap such as rubber, this being used for cushioning between the
  • Adjustment device 2 and the steering column 1 is used.
  • the servomotor 20 can be connected to the housing 921 by means of a press fit and additionally securing and fastening to a motor shield by means of deformed plastic pins or plastic bolts, which are formed by means of hot caulking, hot caulking,
  • Ultrasonic forming, laser-assisted forming or the like are generated to additional components, such as screws or rivets in the corresponding assembly of the servomotor 20 on the
  • the bearing device 202 has a support section 206, via which the bearing device 202 is mounted in the bearing seat 200 in a radially preloaded manner.
  • the support section 206 is connected to the bearing section 310, the support section 206 being elastically prestressable thanks to the recess 306.
  • the bearing device 202 On a surface 207 of the bearing device 202, that is to say the surface which, in the assembled state of the bearing device 202, faces the wall 203 of the bearing seat, the bearing device 202 has pressing ribs 205, that is to say projections, so that the bearing device 202 is supported by an elastic or elastic plastic deformation of the press ribs 205 is introduced into the bearing seat 200 by applying a relatively constant displacement force and is thereby mounted. Is the drive shaft 923 during assembly of the clamping ring 201 in the bearing seat 200 by the
  • Actuator 20 driven, due to the constant displacement force of the bearing device 202 given by the pressing ribs 205 in relation to the wall 203, a prestressing of the clamping ring 201, that is to say a displacement of the clamping ring 201 against the bearing device 203, so that it is pressed against the drive shaft 203 at the end remote from the motor, at a predetermined clamping force and thus by a
  • the press ribs 205 are oriented in the assembled state of the bearing device 202 along the longitudinal axis (axis of rotation) of the drive shaft 923, that is to say axially. 7 and 8, it can be seen that the bearing section 310
  • Bearing device 202 has a radially encircling contact section 206 formed as a spring bar, which in turn has surface 207. In other words, the bearing device 202 is pressed against the wall 203 in the assembled state, in particular by a resilient elastic deformation.
  • the contact section 206 can also be referred to as a support section 206.
  • a bearing opening 208 of the bearing device 203 can also be seen from FIGS. 8 and 9 and in particular the sectional view according to FIG.
  • Drive shaft 923 is pressed to fix it axially, enclosing it spatially and physically at the end remote from the motor in the sense of a sleeve.
  • contact area 206 as a cantilever or as a collar
  • the elastic deformation 206 is localized in the described assembled state of the bearing device (see in particular FIG. 7) so that the Bearing opening 208 experiences almost no radial elastic deformation, which has a positive effect on low-friction mounting of the drive shaft 923 in the bearing opening 208.
  • the bearing opening 208 is mechanically decoupled from the contact section 206 under a load in the radial direction.
  • the bearing opening 208 can be cup-shaped or cup-shaped.
  • the drive shaft 923 preferably has a clearance fit with the bearing opening 208, so that the drive shaft 923 is relative to the bearing opening 208
  • the bearing device 202 has a wall thickness s in the region of the base section 311, this wall thickness s being the smallest wall thickness of the bearing device 202.
  • the bearing opening 208 can alternatively also have a through opening.
  • FIG. 11 shows a bearing device 209 of a further bearing device according to the invention, which, in contrast to the bearing device 203, has recesses 210 arranged radially in the bearing opening 208 for storing and / or transporting lubricant, so that in FIG.
  • FIGS. 12 and 13 show a bearing device 211 of a further bearing device according to the invention.
  • the storage device 211 is configured analogously to the storage device 203, except that the surface 207 has projections formed by a thread 212.
  • Bearing device 211 can be easily and comfortably inserted into the bearing seat by means of a rotary movement.
  • FIG. 14 shows a cross section through the adjusting device 2, one bearing device according to the invention according to another
  • Embodiment can be seen.
  • Embodiment has a bearing device 213 as a bearing means.
  • the bearing device 213 is shaped in such a way that the clamping ring 201 contacts a contact section 214 designed as a spring bar.
  • the bearing device 213 is pressed even more against the wall 203 compared to, for example, the sliding bearing 202, so that the bearing device 213 can only be displaced along the longitudinal axis of the drive shaft 923 from a correspondingly higher axial force.
  • a higher radial preload of the bearing device 213 can be provided in this embodiment.
  • FIG. 15 shows a cross section through a bearing device 400 of a further bearing device according to the invention.
  • the bearing device 400 is configured analogously to the bearing device 202, except that it has a projection 312 which projects into the bearing opening 208. In an assembled state, the storage device 400 can thereafter
  • FIG. 16 shows a cross section through a bearing device 400 of a further bearing device according to the invention.
  • the bearing device 400 is configured analogously to the bearing device 202, except that it has cylindrical rolling elements 500, the rolling elements 500 being arranged in the bearing opening 208, so that the drive shaft 923 is mounted in the bearing section 310 via the rolling elements 500.
  • FIG. 17 shows a cross section through a bearing device 700 of a further bearing device according to the invention.
  • the bearing device 400 is configured analogously to the bearing device 202, except that it has the projection 312 and the rolling elements 500.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Steering Controls (AREA)
  • Power Steering Mechanism (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Support Of The Bearing (AREA)

Abstract

L'invention concerne un dispositif de support (202, 209, 211, 213, 400, 600, 700) pour un entraînement de réglage d'une colonne de direction, le dispositif de support (202, 209, 211, 213, 400, 600, 700) selon l'invention comprenant, pour fournir un support amélioré d'un élément d'entraînement de l'entraînement de réglage, une première extrémité (220) et une deuxième extrémité (222) opposée à celle-ci, une ouverture de support (208) pour le support en rotation de l'élément d'entraînement de l'entraînement de réglage s'étendant dans l'intérieur du dispositif de support à partir de la première extrémité (220) pour la formation d'une section de support (310), un évidement (306) étant prévu, lequel s'étend à l'intérieur du dispositif de support à partir de la deuxième extrémité (222) pour la formation d'une section d'appui (206, 214), cette dernière étant connectée à la section de support (310).
EP19778491.1A 2018-09-28 2019-09-25 Dispositif de support, dispositif de réglage, colonne de direction réglable, procédé pour la fabrication d'un dispositif de réglage Pending EP3857079A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018124143.7A DE102018124143A1 (de) 2018-09-28 2018-09-28 Lagervorrichtung, Verstellvorrichtung, verstellbare Lenksäule, Verfahren zum Herstellen einer Verstellvorrichtung
PCT/EP2019/075799 WO2020064796A1 (fr) 2018-09-28 2019-09-25 Dispositif de support, dispositif de réglage, colonne de direction réglable, procédé pour la fabrication d'un dispositif de réglage

Publications (1)

Publication Number Publication Date
EP3857079A1 true EP3857079A1 (fr) 2021-08-04

Family

ID=68069771

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19778491.1A Pending EP3857079A1 (fr) 2018-09-28 2019-09-25 Dispositif de support, dispositif de réglage, colonne de direction réglable, procédé pour la fabrication d'un dispositif de réglage

Country Status (4)

Country Link
EP (1) EP3857079A1 (fr)
CN (1) CN112771278B (fr)
DE (1) DE102018124143A1 (fr)
WO (1) WO2020064796A1 (fr)

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DE102020201058A1 (de) * 2020-01-29 2021-07-29 Thyssenkrupp Ag Lenksäule für ein Kraftfahrzeug
US11827085B2 (en) * 2020-08-12 2023-11-28 Schaeffler Technologies AG & Co. KG Electric transmission assembly including hydrodynamic bearing

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Also Published As

Publication number Publication date
CN112771278B (zh) 2023-09-01
WO2020064796A8 (fr) 2021-03-25
CN112771278A (zh) 2021-05-07
WO2020064796A1 (fr) 2020-04-02
DE102018124143A1 (de) 2020-04-02

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