EP3867123A1 - Entraînement de réglage destiné à une colonne de direction et colonne de direction destinée à un véhicule automobile - Google Patents

Entraînement de réglage destiné à une colonne de direction et colonne de direction destinée à un véhicule automobile

Info

Publication number
EP3867123A1
EP3867123A1 EP19787240.1A EP19787240A EP3867123A1 EP 3867123 A1 EP3867123 A1 EP 3867123A1 EP 19787240 A EP19787240 A EP 19787240A EP 3867123 A1 EP3867123 A1 EP 3867123A1
Authority
EP
European Patent Office
Prior art keywords
threaded
spindle
drive
threaded spindle
core element
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.)
Withdrawn
Application number
EP19787240.1A
Other languages
German (de)
English (en)
Inventor
Sebastian Huber
Jean-Pierre Specht
Arne Schacht
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 EP3867123A1 publication Critical patent/EP3867123A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • F16H25/2003—Screw mechanisms with arrangements for taking up backlash
    • 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
    • F16H25/2015—Means specially adapted for stopping actuators in the end position; Position sensing means
    • 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
    • F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
    • 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
    • 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
    • F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
    • F16H2025/249—Special materials or coatings for screws or nuts

Definitions

  • the invention relates to an adjustment drive for a steering column for a motor vehicle, comprising a threaded spindle which engages with an external thread in a spindle nut, and a drive motor which is coupled to the threaded spindle or the spindle nut such that the threaded spindle and the spindle nut are relative to one another can be driven in rotation.
  • the invention comprises a steering column for a motor vehicle with at least one such adjustment drive.
  • Steering columns for motor vehicles have a steering shaft with a steering spindle, on the rear end of which facing the driver in the direction of travel, a steering wheel is attached for introducing a steering command by the driver.
  • the steering spindle is rotatably mounted about its longitudinal axis in an actuating unit which is held on the vehicle body by a support unit.
  • an inner jacket tube of the actuating unit also referred to briefly as a jacket tube
  • a jacket unit connected to the support unit also referred to as a guide box, an outer jacket tube or a box rocker, is telescopically displaceable in the direction of the longitudinal axis, can be adjusted in length.
  • a height adjustment can be realized in that the adjusting unit or a jacket unit receiving it is pivotably mounted on the carrying unit.
  • the adjustment of the adjusting unit in the length or height direction enables the setting of an ergonomically comfortable steering wheel position relative to the driver position in the operating position, also referred to as the driving or operating position, in which a manual steering intervention can take place.
  • a motorized adjustment drive with a drive unit with a drive motor for adjusting the actuating unit relative to the support unit, which is connected - generally via a gearbox - to a spindle drive which has a threaded spindle screwed into a spindle nut includes.
  • the drive unit By means of the drive unit, the threaded spindle and the spindle nut can be rotated relative to one another about the threaded spindle axis, as a result of which, depending on the direction of rotation, these can be moved translationally towards or away from one another.
  • a so-called rotary spindle drive the threaded spindle of the drive unit, which is fixedly connected to the actuating unit or the supporting unit by means of its coupling section, can be driven to rotate about its threaded spindle axis and engages in the spindle nut, which unit or the actuating unit with respect to rotation about the threaded spindle axis is fixedly attached.
  • the threaded spindle In the direction of the threaded spindle axis, the threaded spindle is supported on the support unit or the actuating unit via the coupling section, and the spindle nut correspondingly on the actuating unit or the support unit, so that a rotary drive of the threaded spindle causes a translational adjustment of the support unit and the actuating unit caused to each other.
  • the threaded spindle is non-rotatably coupled to the support unit or the actuating unit with respect to rotation about its threaded spindle axis and the spindle nut is rotatable, but is fixed in the direction of the threaded spindle axis correspondingly to the actuating unit or the Support unit stored.
  • the threaded spindle is supported on the support unit or the actuating unit via the coupling section in the direction of the threaded spindle axis, and the spindle nut correspondingly on the actuating unit or the support unit, so that the threaded spindle can be displaced translationally by the drive unit in the direction of the threaded spindle axis is.
  • the spindle drive forms a motorized adjustment drive which is effective between the support unit and the actuating unit and by means of which the actuating unit can be adjusted for adjustment relative to the support unit.
  • a spindle drive of an adjusting drive can be arranged between the casing tube of the actuating unit and an axially displaceably accommodating casing unit which is connected to the support unit, and the threaded spindle axis essentially parallel to the Longitudinal axis can be aligned.
  • a spindle drive can be arranged between the support unit and an actuating unit which is pivotally mounted thereon.
  • a motorized longitudinal and height adjustment can be designed individually or in combination on a steering column.
  • an adjusting drive for a steering column for a motor vehicle comprising a threaded spindle which engages in a spindle nut with an external thread, and a drive motor, by means of which the threaded spindle can be driven to rotate relative to the spindle nut, the threaded spindle is inserted Has core element, which is at least partially coaxially surrounded by a threaded element made of plastic, which has the external thread.
  • the core element forms a force-absorbing structure of the threaded spindle and is designed for this purpose from a material with a higher strength than plastic.
  • the core element preferably consists of a metallic material, preferably of steel or an aluminum alloy. This allows a sufficiently high load capacity to be achieved with a relatively small material cross section.
  • the core element is elongated in the form of a rod or rod, and can preferably have a cylindrical or prism-shaped basic shape, preferably with a smaller cross section than the core cross section of the external thread of the threaded spindle.
  • the core element is at least partially surrounded by the threaded element with respect to its axial length.
  • the threaded element is fixed and preferably non-detachably connected to the core element, and is thereby secured both against relative rotation in the circumferential direction and against axial displacement in the longitudinal direction.
  • the threaded element carries the external thread, which engages in the corresponding internal thread of the spindle nut, ie is screwed in.
  • the spindle nut can be formed from a material of high strength at least in the area of the internal thread, before trains from a metallic material such as steel or non-ferrous metal such as brass or the like.
  • the thread Due to the elastic deformability of the plastic, the thread can be designed with little or no play.
  • the plastic surface of the external thread enables permanent good sliding properties in the internal thread of the spindle nut, even if it is made of a metallic material. As a result, the motorized adjustment can be carried out smoothly, quietly and precisely.
  • the threaded element according to the invention is formed on the threaded spindle means that it is only passed through the spindle nut, i.e. heated when screwing through, and can give off the heat to the environment by radiation and convection, preferably by free convection, via its longitudinal extension outside the spindle nut.
  • a further effective cooling of the threaded spindle is made possible according to the invention in that the material of the core element has a greater thermal conductivity than the plastic.
  • a metallic material usually has a much better thermal conductivity than a plastic material.
  • the core element can effectively dissipate the amount of heat introduced via the connection with the threaded element in the longitudinal extension of the threaded spindle. In this way, the core element can serve as a heat sink or heat exchanger, which avoids a potentially harmful heating of the threaded element even with high heat input through rapid adjustment and large adjustment paths. This increases the long-term stability and operational reliability of the spindle drive.
  • the spindle nut comprises a metallic material, at least in the area of its internal thread. Due to the higher thermal conductivity compared to the plastic material, the heat can also be effectively dissipated to the outside via the spindle nut.
  • the fact that the threaded element formed from plastic can be effectively thermally relieved by the mechanisms described above is particularly relevant for steering columns with long adjustment paths and / or high adjustment speeds. This applies in particular to steering columns for autonomous ferry operation, which on the one hand have a particularly long adjustment range in order to be moved from the operating position to a more distant stowage position outside the operating area, and on the other hand have to achieve high adjustment speeds in order to be able to use them if necessary to be able to be brought into the operating position quickly.
  • a long adjustment path means an adjustment path that is greater than or equal to 80 mm, i.e. the thread length of the threaded element is therefore greater than or equal to 80mm.
  • the threaded element can be sleeve-shaped and fixed on the core element.
  • the threaded element can be provided as a separate threaded sleeve made of plastic, for example as a plastic injection molded part. This has the external thread on its outer circumference, and is connected to the core element in a rotationally locking and axially fixed manner on the inside.
  • the connection can preferably be made in a form-fitting and / or integral manner, by pressing, gluing, welding or the like.
  • the threaded element is injection molded onto the core element in plastic injection molding.
  • the core element is extrusion-coated with the threaded element designed as a plastic injection molded part.
  • a rod-shaped or rod-shaped core element which can be of full or hollow design, is introduced into the thread-shaped mold cavity of an injection molding machine, into which molten thermoplastic material is injected. This creates the threaded element and at the same time integrally connects it to the core element.
  • An advantage of the invention also results in the production in injection molding from the fact that the core element according to the invention has a higher thermal conductivity than the threaded element. This allows the plastic melt to cool and solidify faster, which enables an advantageous reduction in production time.
  • the core element has at least one form-locking element that is positively connected to the threaded element.
  • the interlocking element can comprise projections, depressions, surface structures, such as roughening, knurling or the like, which are in engagement with the threaded element.
  • the form-fitting connection can be created by attaching to the core element the interlocking element is plastically molded into the separately provided threaded element. When the threaded element is injected in plastic injection molding, the form-fitting element can be embedded directly into the plastic melt, which creates a particularly firm, material and form-fitting connection.
  • a gear wheel is at least partially formed with the threaded element.
  • the threaded element can have a gear wheel, or at least parts thereof, for example a hub, or a coaxial toothing in which a drive wheel driven by the drive motor engages.
  • the threaded spindle can be driven in rotation to form a rotary spindle drive.
  • the gear wheel can be made wholly or partially in one piece with the threaded element, preferably from the plastic of the threaded element. In the injection molding process, the gear wheel can preferably be injection molded directly onto the core element in one piece together with the threaded element.
  • the threaded element has at least one prestressing element which is elastically prestressed against a thread turn of the spindle nut, preferably axially against a tooth flank.
  • the external thread of the thread element has at least one helical circumferential tooth, with a tooth profile delimited by axial tooth flanks. The tooth profile engages from the inside in the corresponding thread in the internal thread of the spindle nut.
  • a pretensioning element can be formed in the course of the thread tooth and is directed out of the tooth profile into the thread course, transversely to the course of the thread tooth.
  • the pretensioning element is pressed with a pretensioning force against the opposite tooth flank of the internal thread, so that the thread tooth is clamped in the thread of the internal thread transversely to its helical extension. Due to the pre-tensioning force exerted by the pre-tensioning element, the tooth flanks of the threaded element and the spindle nut can be so braced against each other that there is no longer any thread play. This results in a smooth, low-vibration and precise adjustment.
  • the prestressing element has at least one spring element which is designed to protrude from the threaded element into a thread of the external thread, preferably axially projecting.
  • the spring element is designed to be elastic transversely to the helical extent of the thread tooth, and can preferably have a spring tongue or a spring leaf projecting radially from the thread element.
  • the spring element resiliently comes into contact with a tooth flank, or also with the two tooth flanks of a thread of the internal thread of the spindle nut Contact.
  • the threaded spindle can be elastically clamped in the internal thread of the spindle nut without play.
  • the diameter of the threaded element in the section of the prestressing element is preferably less than or equal to the nominal thread diameter, that is to say the enveloping circle diameter of the threaded element in the region of the external thread.
  • One or more prestressing elements can preferably be formed in one piece with the plastic body of the threaded element, for example as integral elements of a plastic injection molded part.
  • the core element is tubular at least in sections. Weight can be saved because the core element is designed as a tubular hollow body, preferably a hollow cylinder. In addition, heat can be effectively dissipated from the threaded spindle, both during production in plastic injection molding and in adjustment mode, in that a cooling medium at least partially flows through the hollow body.
  • a hollow core element is preferably produced from a metallic material, for example as a steel tube.
  • a hollow core element furthermore offers the advantageous possibility that the core element has a deformation section squeezed together transversely to its longitudinal extension, in which a coupling section is formed.
  • the coupling section can be formed by a deformation section, also referred to as a press section, in which a pipe section is plastically squashed transversely to the axis.
  • the core element can preferably have a corrugated tube section at least in sections.
  • the corrugated pipe section can have an alternating arrangement of convex and concave sections.
  • alternating circumferential grooves and circumferential projections form the corrugated pipe section.
  • the circumferential grooves and the circumferential projections are circumferential in relation to the threaded spindle axis.
  • At least one groove and / or a projection can form the corrugated tube section in a spiral around it.
  • Such grooves and protrusions can be formed into a circular cylindrical tube by a rolling process.
  • the hollow cylindrical core element can initially preferably be provided as a circular cylindrical tube section without pre-deformations, for example by means of a piece of semifinished product that has been cut to length.
  • the hollow cylindrical tube section has a polygonal cross section and is designed, for example, as a square, hexagonal or octagonal tube or the like (polygonal).
  • the opposing, now flat sections of the former tube wall extend parallel to a plane, the so-called pressing plane, which lies parallel to the axis.
  • a flat full cross section is formed, the thickness of which, measured in the forming direction, that is to say normal to the pressing plane, preferably essentially corresponds to twice the wall thickness of the tube wall of the core element.
  • the basic shape of the coupling section can be realized by a simple plastic forming step, preferably by cold forming, namely the flat, flat squeezing of hollow or tubular material.
  • the forming energy required for this is significantly lower than when the coupling section is formed and the receiving opening is formed by means of solid forming from solid material, for example a rod section.
  • the forming tools for squeezing can be realized with simple, flat press jaws, which requires significantly less effort than individually shaped dies for massive forming.
  • the adaptation to the connection with a threaded spindle can be made simply by selecting the tube material which can be made available as a standard product, in particular also in different materials such as steel, stainless steel, non-ferrous metal or the like.
  • a transversely continuous joint opening for receiving a hinge pin or the like can be introduced into the coupling section and, alternatively or additionally, can have further fastening elements.
  • Such connections are known in principle in the prior art.
  • the threaded spindle has an internal thread.
  • a further threaded spindle can be screwed into the internal thread, as a result of which a multi-stage, telescopic screw drive can be provided.
  • the internal thread forms the spindle nut for the further threaded spindle, which can plunge axially into the tubular threaded spindle according to the invention when screwing in.
  • the internal thread can be formed in the core element or in the thread element.
  • the internal thread can be formed in one piece in the metallic core element, preferably made of steel.
  • the core element enables effective cooling of a screwed-in further threaded spindle, which may have a thread formed from plastic, for example with a threaded element according to the invention.
  • the threaded element can have the internal thread, which can be produced in one piece with the threaded element in plastic injection molding.
  • the internal thread can be arranged in a section of the threaded element that extends from the front opening into the pipe cross section.
  • the core element or the threaded element has a stop element.
  • a stop element can, for example, comprise a projection projecting radially over the thread, for example an externally formed collar which cannot be screwed through the spindle nut and thereby forms an axial end stop for the translational movement of the threaded spindle relative to the spindle nut.
  • the stop element can be formed on the core element, for example by plastic widening or molding of the wall of a tubular core element.
  • an axial stop can take place by suitable shaping of a plastic injection molded part.
  • Lubricant pockets serve as a reservoir for a lubricant, for example grease, and have one or more depressions or indentations in the area of the thread profile. During assembly, these are filled with lubricant, which ensures reliable, long-term lubrication of the thread during operation.
  • the invention also relates to a steering column for a motor vehicle, with a support unit which can be attached to a vehicle body and from which an actuating unit is held in which a steering spindle is rotatably mounted, and with an adjustment drive which has a threaded spindle , which engages with an external thread in a spindle nut, and comprises a drive motor which is coupled to the threaded spindle or the spindle nut such that the threaded spindle and the spindle nut can be driven to rotate relative to one another, the adjustment drive having at least one coupling section which is connected to the support unit or the actuating unit, the threaded spindle being designed in accordance with one of the embodiments described above.
  • the coupling section can preferably be formed on a threaded spindle.
  • the invention further comprises a method for producing an adjustment drive, which comprises a threaded spindle which engages in a spindle nut with an external thread, and a drive motor which is coupled to the threaded spindle or the spindle nut such that the threaded spindle and the spindle nut are relative to one another are drivable in rotation, the threaded spindle having at least one coupling section, with the steps:
  • the core element can be designed as described above for the designs of the adjusting drive.
  • the threaded element can also be designed accordingly.
  • Production is preferably carried out in plastic injection molding, in which the core element is inserted into a mold cavity of an injection molding machine and overmolded with molten plastic, the threaded element being simultaneously formed from the plastic and a connection being produced with the core element.
  • a gear wheel, an internal thread and / or a stop element can advantageously be formed in one piece in the plastic injection molded part together with the external thread. Description of the drawings
  • FIG. 1 shows a schematic perspective view of a steering column according to the invention
  • FIG. 2 shows a further perspective view of the steering column according to the invention according to FIG. 1 from a different viewing angle
  • FIG. 3 shows an adjustment drive according to the invention in a schematic perspective illustration
  • FIG. 4 shows a longitudinal section through the adjusting drive according to FIG. 3 along the threaded spindle axis, FIG.
  • FIG. 5 shows a perspective view of a threaded spindle in a first embodiment
  • FIG. 6 shows a detailed view of the external thread of the threaded spindle according to FIG. 5,
  • FIG. 7 shows a longitudinal section through the threaded spindle according to FIG. 5,
  • FIG. 8 shows the threaded spindle according to FIG. 5 in a schematic, exploded view
  • FIG. 9 shows a schematically exploded perspective view of a threaded spindle as in FIG. 8 in a second embodiment
  • Figure 10 is a detailed view of a second embodiment of the external thread of the
  • FIG. 11 shows a radial view of the detail from FIG. 10
  • FIG. 12 shows a further embodiment of the external thread of the threaded spindle in a view as in FIG. 1 1,
  • FIG. 13 shows a longitudinal section as in FIG. 4 through a second embodiment of an adjustment drive
  • FIG. 14 shows a perspective view of the spindle drive of the adjustment drive according to FIG. 13,
  • FIG. 15 shows a longitudinal section as in FIG. 4 through an adjustment drive in a third
  • FIG. 16 shows a longitudinal section as in FIG. 15 through an adjustment drive in a third
  • FIG. 17 shows a longitudinal section through a threaded spindle and spindle nut of an adjusting drive in a fourth embodiment
  • FIG. 18 shows a perspective view of the core element according to FIG. 17,
  • FIG. 19 shows a longitudinal section through a threaded spindle and spindle nut of an adjusting drive in a fifth embodiment.
  • Figure 1 shows a steering column 1 according to the invention in a schematic perspective view obliquely from the top right 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.
  • Figure 2 shows the steering column 1 in a view from the opposite side, that is seen from the top right.
  • the steering column 1 comprises a support unit 2, which is designed as a console, which has fastening means 21 in the form of fastening bores, for attachment to a vehicle body, not shown.
  • An actuating unit 3 is held by the carrying unit 2, which is accommodated in a jacket unit 4 - also referred to as a guide box or box rocker.
  • the actuating unit 3 has a tubular casing 31, in which a steering spindle 32 around a
  • Longitudinal axis L is rotatably supported, which is axially in the longitudinal direction, i.e. extends in the direction of the longitudinal axis L.
  • a fastening section 33 is formed on the steering spindle 32, to which a steering wheel (not shown) can be attached.
  • the actuating unit 3 is accommodated so as to be able to be displaced telescopically in the direction of the longitudinal axis L in order to be able to position the steering wheel connected to the steering spindle 32 in the longitudinal direction back and forth relative to the carrying unit 2, as with indicated by the double arrow parallel to the longitudinal axis L.
  • the jacket unit 4 is mounted in a pivot bearing 22 on the support unit 2 so as to be pivotable about a horizontal pivot axis S lying transversely to the longitudinal axis L.
  • the jacket unit 4 is connected to the support unit 2 via an adjusting lever 41.
  • the actuating lever 41 By rotating the actuating lever 41 by means of an actuator 6 shown (see FIG. 2), the casing unit 4 can be pivoted relative to the support unit 2 about the pivot axis S lying horizontally in the installed state, thereby adjusting a steering wheel attached to the fastening section 33 in FIG Height direction H can be made, which is indicated by the double arrow.
  • a first adjustment drive 5 for the longitudinal adjustment of the actuating unit 3 relative to the casing unit 4 in the direction of the longitudinal axis L has a spindle drive with a spindle nut 51 with an internal thread 74 extending along an axis G, into which a threaded spindle 52 engages, i.e. with its external thread in the corresponding internal thread 74 of the spindle nut 51 is screwed in.
  • the threaded spindle axis of the threaded spindle 52 is identical to the axis G and runs essentially parallel to the longitudinal axis L.
  • the spindle nut 51 is rotatably mounted about the axis G in a bearing housing 53 which is fixedly connected to the casing unit 4. In the direction of the axis G, the spindle nut 51 is axially supported on the casing unit 4 via the bearing housing 53.
  • the adjustment drive 5 is accordingly a so-called sub-spindle drive.
  • the threaded spindle 52 is connected to a fastening element 54 formed at its rear end via a transmission element 34 with the actuating unit 3, specifically in the direction of the axis G or the longitudinal axis L and fixed with respect to rotation about the Axis G.
  • a so-called plunger spindle drive is realized by the spindle nut 51 which can be driven in rotation and the threaded spindle 52 which is fixed with respect to rotation.
  • the transmission element 34 extends from the actuating unit 3 through a slot-shaped passage opening 42 in the casing unit 4. To adjust the steering column 1 in the longitudinal direction, the transmission element 34 can be moved freely in the passage opening 42 in the longitudinal direction.
  • the adjustment drive 5 has an electric drive motor 55, of which the spindle nut 51 can be driven to rotate with respect to the axis G relative to the fixed threaded spindle 52.
  • the threaded spindle 52 can be displaced translationally in the direction of the axis G relative to the spindle nut 51, so that accordingly the adjusting device 3 connected to the threaded spindle 52 relative to the casing unit 4 connected to the spindle nut 51 in the direction of Longitudinal axis L is adjusted.
  • the drive of the spindle nut 51 and the support of the spindle nut 51 in the direction of the axis G on the jacket unit 4 will be explained in more detail below.
  • FIG. 2 which shows a perspective view of the steering column 1 from the rear side in FIG. 1, it can be seen how a second adjustment drive 6 is attached to the steering column 1 for adjustment in the height direction H.
  • This adjustment drive 6 comprises a spindle nut 61, in whose internal thread 74 a threaded spindle 52 engages along an axis G.
  • the threaded spindle 52 is rotatably mounted about the axis G in a bearing housing 63, which is fastened to the jacket unit 4, and is axially supported on the jacket unit 4 in the direction of the axis G, and optionally by an electric drive motor 65 both directions of rotation can be driven to rotate about the axis G.
  • the adjustment drive 6 is a so-called rotary spindle drive.
  • the spindle nut 61 which can be made of plastic or a non-ferrous metal such as brass or the like, is fixed with respect to a rotation about the axis G at one end of the two-armed adjusting lever 41, which is rotatable about a pivot bearing 23 on the T projecting unit 22 is mounted, and the other arm is connected at the other end to the jacket unit 4.
  • the spindle nut 61 By rotating the threaded spindle 61 - depending on the direction of rotation of the drive motor 65 - the spindle nut 61 can be displaced translationally in the direction of the axis G relative to the threaded spindle 52, so that the jacket unit 4 connected to the spindle nut 41 via the actuating lever 41 together with the adjusting device accommodated therein 3 relative to the Support unit 2 can be adjusted up or down in the height direction H, as indicated by the double arrow.
  • the drive of the threaded spindle 52 and the support of the threaded spindle 52 in the direction of the axis G on the jacket unit 4 will be explained in more detail below.
  • FIGS. 3 and 4 show the adjusting drive 5 designed as a submersible spindle drive in a single illustration.
  • the threaded spindle 52 has a tubular, hollow cylindrical core element 57, preferably made of steel tube, on which a threaded element 58 is permanently attached coaxially, which has the external thread with a helical circumferential thread tooth 581, and is injection molded in plastic injection molding can.
  • the tube of the core element 57 is preferably squeezed flat by cold forming transversely to the axis of the threaded spindle, and has a fastening hole 541 that is perpendicular to the squeezing.
  • a fastening bolt 542 is guided through this fastening bore 541 for the rotationally fixed connection to the transmission element 34, as can be seen in FIG. 1.
  • the threaded spindle 52 is screwed into a spindle nut 51 which is rotatable in the bearing housing 53 but is firmly supported in the direction of the threaded spindle axis G.
  • the spindle nut 51 is designed as a gear wheel and has a toothing 72 on its outer circumference, namely a worm toothing.
  • a worm 56 is connected to the motor shaft of the drive motor 55 and meshes with a toothing, so that the spindle nut 51 can be driven to rotate relative to the threaded spindle 52.
  • the core element 57 has a stop element 571, which is designed as a radially outwardly projecting, circumferential collar, preferably by cold-formed expansion of the tubular core element 57.
  • the threaded element 58 At its end facing the fastening element 54, the threaded element 58 likewise has a stop element 580, which is designed as a circumferential projection or collar, which is formed in one piece with the threaded element 58 in plastic injection molding.
  • the stop elements 571 and 580 form axial stops which cannot be screwed through the spindle nut 51 and thus limit the adjustment path.
  • FIG. 5 shows the threaded spindle 52 isolated in a perspective view.
  • the threaded element 58 has an axially continuous flattening 582, which can be clearly seen in the enlarged section of FIG. 6.
  • the thread tooth 581 has a gap in each revolution, in each of which a prestressing element 59 is formed.
  • the prestressing elements 59 in the first embodiment of FIG. 6 are designed as radially protruding blocks or blocks, which can be slightly wider in the axial direction than the circumferential cross section of the threaded tooth 58.
  • the prestressing elements 59 can also preferably be integrally molded with the threaded element 58 in plastic injection molding be trained. By means of elastic deformation of the plastic, the prestressing elements 59 can be resiliently prestressed or tensioned in the thread of the internal thread of the spindle nut 51.
  • FIGS. 10 and 11 and 12 show further variants of prestressing elements 59.
  • the threaded element in turn has at least one, preferably two opposite flats 582 in which the threaded tooth 581 has a gap in the circumference.
  • each prestressing element 59 has two radially protruding, leaf-shaped or finger-shaped spring elements 591 which are axially spaced in the direction of the threaded spindle axis G and in the circumferential direction. These are elastically bendable in the axial direction and, in the undeformed state, project slightly axially beyond the cross section of the threaded tooth 581. As a result, in the screwed-in state, they are each clamped in a thread between the thread flanks in the internal thread of the spindle nut 51.
  • each spring element 591 being designed as a Z-shaped spring leaf in which the spring elements in pairs in FIG. 11 are combined in one piece.
  • spring elements 591 can be integrally formed on the threaded element 58 in plastic injection molding. Due to its dimensions, the Elasticity and the spring force exerted for pretensioning can be adjusted and specified as required.
  • the free space between the spring elements 591 can be used as a lubricant pocket 583.
  • FIGS. 8 and 9 schematically show the core element 57 and the threaded element 58 in an axially exploded view. While in FIG. 8 the tubular area, in which the threaded element 58 is in the assembled state, is cylindrical in shape with a smooth surface, in the embodiment according to FIG. 9 it has form-fitting elements 584, which are designed as indentations such as grooves, openings or projections can, which are embedded in the plastic during molding and produce a positive connection in the axial and circumferential direction.
  • FIGS. 13 and 14 show a further development of a submersible spindle drive, in which the threaded spindle 52 does not have the fastening element but an internal thread 521, into which a second threaded spindle 522 is screwed, which is connected at its free end to the fastening element 54.
  • the internal thread 521 can be formed in a threaded bush 520, which is inserted into the core element 57 and / or is connected to the threaded element 58, for example by the overmolding described above. It is also conceivable and possible to form the internal thread 521 in one piece in the threaded element 58 in plastic injection molding.
  • FIG. 15 and FIG. 16 show a longitudinal section through the bearing housing 63 of the adjustment drive 6 along the axis G in different design variants.
  • the rotary spindle drive it is not the spindle nut that is driven in rotation by the drive motor, but the threaded spindle 52.
  • the gear wheel 7, together with the threaded element 58, is made at least partially in one piece from plastic by injection molding and has a hub element 71.
  • the gear wheel 7 On its outer circumference, the gear wheel 7 has a toothing 72 running coaxially to the axis G, which in the example shown is designed as a worm toothing, so that the gear wheel 7 forms a worm wheel.
  • a worm 66 which can be driven in rotation by the drive motor 65 engages in the toothing 72.
  • the hub element 71 is integrally formed with the threaded element 58 in plastic injection molding.
  • Bearing rings 8 are firmly connected to the hub element 71.
  • Each bearing ring 8 has a bearing surface 81, which is designed as a ball raceway and is coaxial to the axis G. As seen from the hub element 71, the two bearing surfaces 81 converge conically at the end. In other words, the ball races are at an angle to the axis G.
  • the bearing rings 8 have support sections 82 which are axially directed in the direction of the axis G and which, in the example shown, bear directly against one another, so that the bearing rings 8 are supported directly against one another in the direction of the axis G.
  • the bearing rings 8 are preferably formed as sheet metal parts, particularly preferably as press-stamped parts made of sheet steel.
  • the bearing rings 8 are overmolded by the plastic of the threaded element 58, and is thus embedded in the hub element 71 in a material and form-fitting manner except for the bearing surfaces 81 which are exposed on the outside on the end face.
  • the bearing surfaces 81 form the inner rings of a roller bearing arrangement, which comprises balls 91, which are rotatably held in a ball cage 92 and are arranged such that they can roll in outer bearing rings 93 in the axial bearing gap between said ball raceways of the bearing surfaces 81 and corresponding ball raceways .
  • the outer bearing rings 93 as seen from the gear wheel 7 on both end faces, are supported axially outwardly on abutments 94.
  • the gear wheel 7 including the hub element 71 and toothing 72 is made in one piece with the threaded element 58 from plastic by injection molding.
  • FIG. 17 shows a longitudinal section through a threaded spindle 52 and a spindle nut 51 in a fourth embodiment.
  • the threaded spindle 52 according to the invention has a hollow corrugated core element 57, preferably made of steel, on which a threaded element 58 is permanently attached coaxially, which has the external thread with a helical circumferential thread tooth 581, and can be injection-molded in plastic.
  • the core element 57 has an alternating arrangement of convex and concave sections.
  • the core element 57 has a spiral circumferential groove 586 and a spiral circumferential projection 585.
  • the thread tooth 581 preferably has a pitch, the pitch of the thread tooth 581 being the same as that of the circumferential groove 586 or the pitch of the circumferential projection 585.
  • the thread tooth 581 is preferably formed in the thread element 58 in the region of the spiral-shaped projection 586.
  • the thread tooth 581 and the circumferential projection are arranged synchronously with one another.
  • the groove 586 and the protrusion 585 form the interlocking elements, which are embedded in the plastic of the threaded element 58 during injection molding and produce a form-fitting connection in the axial and circumferential directions. A particularly stable and rigid arrangement can thus be provided.
  • the core element 57 according to FIG. 17 is shown in a perspective view, the core element 57 having a spiral circumferential groove 586 and a spiral circumferential projection 585.
  • the circumferential groove 586 and the circumferential projection 585 are preferably designed such that they form an electrical thread (Edison thread) in accordance with DIN 40400.
  • FIG. 19 shows a longitudinal section through a threaded spindle 52 and a spindle nut 51 of an adjustment drive 5 along the threaded spindle axis G in a fifth embodiment.
  • This embodiment shows a development of a submersible spindle drive similar to the embodiment according to FIG. 17, in which the threaded spindle 52 has a threaded bush 520 with an internal thread 521, into which a second threaded spindle 522 is screwed, which at its free end is connected to the fastening element 54 is connectable, as is known from the embodiment of Figures 13 and 14.
  • the internal thread 521 is formed in the threaded bush 520 made of plastic, which is injected into the core element 57.
  • the thread tooth of the internal thread 521 is formed synchronously with the groove 586, the groove 586 forming a projection with respect to the internal thread 521, that is to say viewed from the inside.
  • a groove on the outer lateral surface of the core element 57 preferably forms a projection or vice versa on the inner lateral surface.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Transmission Devices (AREA)
  • Gears, Cams (AREA)

Abstract

La présente invention concerne un entraînement de réglage (5) destiné à une colonne de direction (1) destinée à un véhicule automobile, comprenant une broche filetée (52) qui s'insère dans un écrou de broche (51) au moyen d'un filetage externe, et un moteur d'entraînement (55) qui est accouplé à la broche filetée (52) ou à l'écrou de broche (51) de manière à ce que la broche filetée (52) et l'écrou de broche (51) puissent être entraînés à rotation l'un par rapport à l'autre. Selon l'invention, afin de permettre une réduction de la complexité de fabrication et une amélioration de la fonction, la broche filetée (52) présente un élément central (57), qui est entouré fixement coaxialement, au moins sur certaines parties, par un élément fileté en plastique (58), qui présente le filetage externe.
EP19787240.1A 2018-10-19 2019-10-14 Entraînement de réglage destiné à une colonne de direction et colonne de direction destinée à un véhicule automobile Withdrawn EP3867123A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018217960.3A DE102018217960A1 (de) 2018-10-19 2018-10-19 Verstellantrieb für eine Lenksäule und Lenksäule für ein Kraftfahrzeug
PCT/EP2019/077732 WO2020078877A1 (fr) 2018-10-19 2019-10-14 Entraînement de réglage destiné à une colonne de direction et colonne de direction destinée à un véhicule automobile

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EP3867123A1 true EP3867123A1 (fr) 2021-08-25

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US (1) US11472463B2 (fr)
EP (1) EP3867123A1 (fr)
CN (1) CN112888618B (fr)
DE (1) DE102018217960A1 (fr)
WO (1) WO2020078877A1 (fr)

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DE102018219264A1 (de) * 2018-11-12 2020-05-14 Thyssenkrupp Ag Verstellantrieb für eine Lenksäule und Lenksäule für ein Kraftfahrzeug
DE102019212435A1 (de) * 2019-08-20 2021-02-25 Thyssenkrupp Ag Lenksäule für ein Kraftfahrzeug
US11358627B2 (en) * 2019-11-06 2022-06-14 Steering Solutions Ip Holding Corporation System, method and apparatus for a telescopic lead screw for a steering column
DE102020202196A1 (de) 2020-02-20 2021-08-26 Thyssenkrupp Ag Verstellantrieb für eine Lenksäule und Lenksäule für ein Kraftfahrzeug
DE102020117447B3 (de) 2020-07-02 2021-04-29 Thyssenkrupp Ag Lenksäule für ein Kraftfahrzeug
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DE102020132084A1 (de) 2020-12-03 2022-06-09 Schaeffler Technologies AG & Co. KG Spindeltrieb
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GB2611110A (en) 2021-09-22 2023-03-29 Zf Steering Systems Poland Sp Zo O Steering column assembly for a vehicle
EP4230502A1 (fr) * 2022-02-22 2023-08-23 thyssenkrupp Presta Aktiengesellschaft Entraînement de réglage pour une colonne de direction et colonne de direction pour un véhicule automobile
DE102023104230A1 (de) 2023-02-21 2024-08-22 Schaeffler Technologies AG & Co. KG Gewindespindel und Verfahren zur Herstellung einer Gewindespindel

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DE102020202196A1 (de) * 2020-02-20 2021-08-26 Thyssenkrupp Ag Verstellantrieb für eine Lenksäule und Lenksäule für ein Kraftfahrzeug

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CN112888618A (zh) 2021-06-01
US11472463B2 (en) 2022-10-18
CN112888618B (zh) 2023-04-11
DE102018217960A1 (de) 2020-04-23
WO2020078877A1 (fr) 2020-04-23
US20210362768A1 (en) 2021-11-25

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