EP3924645A1 - Vis d'entraînement à roulement planétaire et actionneur pour une direction d'essieu arrière d'un véhicule à moteur équipé d'une telle vis d'entraînement à roulement planétaire - Google Patents

Vis d'entraînement à roulement planétaire et actionneur pour une direction d'essieu arrière d'un véhicule à moteur équipé d'une telle vis d'entraînement à roulement planétaire

Info

Publication number
EP3924645A1
EP3924645A1 EP19823766.1A EP19823766A EP3924645A1 EP 3924645 A1 EP3924645 A1 EP 3924645A1 EP 19823766 A EP19823766 A EP 19823766A EP 3924645 A1 EP3924645 A1 EP 3924645A1
Authority
EP
European Patent Office
Prior art keywords
nut
screw drive
threaded spindle
planetary screw
drive according
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
EP19823766.1A
Other languages
German (de)
English (en)
Inventor
Daniel Faber
Benjamin Wübbolt-Gorbatenko
Alexander Hausmann
Alena Pöhnlein
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
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 Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of EP3924645A1 publication Critical patent/EP3924645A1/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
    • 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
    • F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
    • F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
    • F16H25/2252—Planetary rollers between nut and screw
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0442—Conversion of rotational into longitudinal movement
    • B62D5/0451—Roller spindle drives
    • 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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/54—Systems consisting of a plurality of bearings with rolling friction
    • 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
    • F16H25/2006—Screw mechanisms with arrangements for taking up backlash with more than one nut or with nuts consisting of more than one bearing part
    • 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
    • F16C2361/00—Apparatus or articles in engineering in general
    • F16C2361/61—Toothed gear systems, e.g. support of pinion shafts

Definitions

  • the present invention relates to a planetary screw drive and an actuator of a steering device of a motor vehicle, in particular a rear axle steering system with such a planetary screw drive.
  • Planetary screw drive with a threaded spindle is required.
  • a planetary roller screw drive according to the features of the preamble of claim 1 has become known. This is provided with a threaded spindle, and with a nut arranged on the threaded spindle, which is formed from nut parts arranged one behind the other along the threaded spindle, and with planets distributed over the circumference of the threaded spindle, which mesh on the one hand with the threaded spindle and on the other hand with the nut, and with a clamping element that axially pretensions the nut.
  • the clamping element is formed here by a multi-part spacer ring which is inserted between the two nut parts and presses the two nut parts axially away from one another. This force is supported by the planets with which the two nut parts are engaged. The planets are put under tension by the pre-tensioning force.
  • the object of the present invention was to specify an alternative planetary screw drive according to the features of the preamble of claim 1.
  • the planetary screw drive is provided with a threaded spindle, and with a nut element arranged on the threaded spindle, which has a nut formed from nut parts arranged one behind the other along the threaded spindle, and with planets distributed over the circumference of the threaded spindle, which on the one hand connect with the
  • the nut parts are mutually supported and connected to one another by means of the tensioning element.
  • the arrangement known from DE 10 2013 213 704 A1 absolutely requires a multi-part spacer ring that removes the two nut parts pushes each other.
  • the nut parts must either be axially supported by other components or by the planets that mesh with the nut parts.
  • the invention does not require any additional components and holds the nut parts axially or internally together.
  • the fact that the nut parts are pretensioned towards each other also result in further advantages: in this arrangement the planets are preloaded under pressure. Since the nut parts are mutually supported, this supporting force does not have to be absorbed by other components.
  • the nut element is to be rotatably mounted on a component by means of a bearing, this supporting force is not introduced into the bearing.
  • this bearing therefore only carries the axial external load and not the axial load due to the preload of the nut parts.
  • the bearing can therefore be dimensioned weaker.
  • the clamping element can have two clamping sleeves which mutually support one another in the axial direction, one of which is supported on one nut part and the other on the other nut part.
  • a multi-part spacer ring is not required.
  • a prestressing force of the clamping element acting on the nut is absorbed by the clamping sleeves, which mutually support one another in the axial direction.
  • the supporting force acting between the two clamping sleeves corresponds in the described arrangement to the axial force acting between the two nut parts plus an axial force component which, in the case of a preload of the planets, may be between the nut parts and the
  • the two clamping sleeves tighten the nut parts axially towards one another, that is to say press them together with a compressive force.
  • the clamping sleeves with one another are therefore subjected to tensile loads with a view to their mutual support.
  • the tensile force corresponding to the compressive force is applied by the two clamping sleeves.
  • the compressive force can be transmitted completely between the two nut parts, or else partially or completely from one nut part via the planets in rolling engagement to the other nut part.
  • the first clamping sleeve can have an external thread and the second clamping sleeve can have an internal thread, both clamping sleeves each receiving one of the nut parts.
  • the two clamping sleeves can each be provided with a nut seat.
  • the two clamping sleeves work with one another in the manner of a screw connection, the screw axis of which preferably coincides with the axis of the threaded spindle.
  • the nut seats ensure that the nut and the clamping element are correctly positioned with respect to one another and are axially pretensioned.
  • a variant is proposed, the two nut parts of which are screwed together.
  • One nut part has an external thread
  • the other nut part has an internal thread meshing with the external thread.
  • the two clamping sleeves can be omitted.
  • Both nut parts are supported and connected to one another by means of the screw connection.
  • Both mother parts mesh with the planets and put pressure on them.
  • Both nut parts are pretensioned towards one another.
  • An expedient further development provides a planet carrier which accommodates the planets and on which the nut element is rotatably mounted by means of a first bearing.
  • the planets distributed over the circumference can be rotatably mounted in pockets of the planet carrier. If a planetary screw drive with accurate pitch is required, it is beneficial to drive the planet carrier of the planetary screw drive. If the planet carrier is driven in rotation, the planets must rotate together with the planets around the spindle axis. Regardless of whether there is a slip between the planet and the threaded spindle, there will be an axial relative displacement between the planet carrier and the threaded spindle per revolution of the planet carrier, which corresponds to the pitch of the threaded spindle. Planetary screw drives with accurate pitch are particularly advantageous in actuators for rear-axle steering systems. In this application, precise articulation of the rear wheels must be guaranteed.
  • the nut element can be mounted axially and radially on the planet carrier by means of a first bearing of the first bearing.
  • its drive causes a relative rotation between the planet carrier and the nut element.
  • the planets in rolling engagement with the threaded spindle and the nut are set in rotation by the rotation of the planet carrier and thus drive the nut, which also rotates, but at a different speed than the planet carrier.
  • the planets can - as explained above - with their planet-side groove profile with a nut-side groove profile of the nut and a thread of the
  • the threaded spindle is in rolling engagement.
  • the planets are in play-free engagement with the nut and the spindle: the grooves of the groove profile both on the nut and on the planets are, as is known, limited by circumferential teeth; the teeth of one nut part and the teeth of the other nut part rest against tooth flanks of the planet-side teeth facing away from one another.
  • a spacer washer can be arranged between the two nut parts of the nut.
  • the preload of the planets can be varied depending on the width of the spacer washer, so that the efficiency of the planetary screw drive can be influenced.
  • the planets are preferably in play-free engagement with the nut and the spindle.
  • the rotationally driven planet carrier can be attached to a housing by means of a second
  • Storage be rotatably mounted. This arrangement can be advantageous in an actuator which has the planetary roller screw drive.
  • the housing can be advantageous in an actuator which has the planetary roller screw drive.
  • the planet carrier can have a sleeve section that receives the nut element, as well as flanges located at the axial ends of the sleeve section. These flanges can be provided with bearing seats for the two bearings of said second bearing.
  • the planetary roller screw drive according to the invention is advantageously part of an actuator for a steering device of a motor vehicle, preferably for rear axle steering.
  • This actuator is provided with a housing in which the planetary screw drive is arranged, and with a steering rod which penetrates the housing and of which the threaded spindle is part.
  • the planet carrier can have a belt drive through a
  • the threaded spindle can at its axial ends
  • Threaded spindle are connected.
  • the aim is to ensure that no steering movements can be carried out under the action of external forces acting on the actuator.
  • the actuator is to be "frozen”. If external axial forces are introduced into the actuator via the handlebar, the Planetary screw drive according to the invention ensure that a relative displacement between the steering rod and the fixed housing on the vehicle side
  • the invention can also be used in so-called steer-by-wire actuators.
  • the wheels of the front axle of the motor vehicle are articulated.
  • the amplitudes of the steering rod are significantly larger compared to the rear axle.
  • the handlebar can therefore be designed for correspondingly large travel ranges.
  • Figure 1 in a schematic representation of a longitudinal section through a
  • Figure 2 is a planetary screw drive according to Figure 1 in longitudinal section
  • FIG. 3 shows the planetary roller screw drive from FIG. 2 in a perspective illustration
  • Figure 4 shows an actuator of a rear axle steering of a motor vehicle with a
  • Figure 1 shows a planetary screw drive in longitudinal section.
  • a nut 2 which is formed from nut parts 3 arranged one behind the other along the threaded spindle 1, is arranged on a threaded spindle 1, which is arranged non-rotatably in this example.
  • planets 4 Arranged over the circumference of the threaded spindle 1 are planets 4, on the one hand with the
  • the planets 4 are each provided with radially tapered end sections 5 and one which is arranged between the two end sections 5 and is radially enlarged
  • Grooved profile 7, 8 provided.
  • the groove profile 8 of the middle section 6 meshes with a thread profile 9 arranged on the outer circumference of the threaded spindle 1.
  • the groove profiles 7 of the end sections 5 mesh with a groove profile 10 formed on the inner circumference of the nut 2. All the groove profiles 7, 8, 10 are inherent in a known manner closed grooves arranged transversely to the respective longitudinal axis are formed. Grooves arranged adjacent to one another are delimited by self-contained teeth.
  • On the nut 2 there is arranged a clamping element 11 which axially prestresses the nut 2 and which has two clamping sleeves 12, 13 which support each other in the axial direction, one of which is supported on one nut part 3 and the other on the other nut part 3.
  • the first clamping sleeve 12 has an external thread 14 and the second clamping sleeve 13 has an internal thread 15.
  • the two clamping sleeves 12, 13 are screwed together with their external thread 14 and internal thread 15, with both clamping sleeves 12, 13 each having a nut seat 18, 19 for receiving one of the nut parts 3.
  • the two clamping sleeves 12, 13 are supported on the two nut parts 3, for example, by means of radial ribs 16, 17 which are formed on the clamping sleeves 12, 13.
  • a spacer washer 40 is arranged axially between the two clamping sleeves 12, 13, the thickness of which is dimensioned such that the two nut parts 3, which are prestressed towards one another, are in play-free engagement with the planets 4.
  • the planets 4 are therefore biased under pressure.
  • the nut 2 can be part of a nut element 20, which in the present case is formed from the nut 2 and the clamping element 11. The prestressing force acts within this nut element 20.
  • the planets 4 are rotatably mounted in a planet carrier 21.
  • the planet carrier 21 has pockets 22 in which the planets 4 are rotatably mounted so that the planets 4 can rotate about their respective longitudinal axes.
  • the planet carrier 21 has flanges 23 located axially on both sides of the nut element 20, on the sides of which the pockets 22 are arranged.
  • the planet carrier 21 engages around the nut element 20 with a sleeve section 24, which is connected with its axial ends to the flanges 23.
  • the nut element 20 is rotatably mounted on the planet carrier 21 by means of a first bearing 25.
  • both clamping sleeves 12, 13 are each axially and radially on the first bearing 25 by means of a first bearing 26
  • the planetary carrier 21 is rotatably mounted on a housing 28 by means of a second bearing 27 having a second bearing 28.
  • the first and second bearings 26, 29 are arranged on end faces of the two flanges 23 facing away from one another.
  • Each flange 23 is provided with a first bearing seat 30 for the first bearing 26 and with a second bearing seat 31 for the second bearing 29.
  • the flanges 23 are by means of Sleeve section 24 rotated with each other and axially connected with play with play.
  • the housing 28 has two bearing seats 42 for receiving the second bearings 29.
  • the planet carrier 21 has first bearing seats 41 for receiving the first bearings 26.
  • FIGS. 1 and 2 show the planetary screw drive from Figure 1 in a constructive implementation.
  • the planet carrier 21 is designed in several parts and has a sleeve 32 corresponding to the sleeve section (FIG. 1), which is connected to the two flanges 23 in a rotationally fixed manner.
  • the non-rotatable connection is made possible in this exemplary embodiment by lugs 33 of the flange 23 which are arranged distributed over the circumference and which engage in slots 34 of the sleeve 32 with axial play (FIG. 3).
  • the axial play serves as an adjusting play for setting the bearings 25, 27 of the planetary roller screw drive in the housing 28.
  • the second bearings 29 are placed axially towards one another. Under this adjusting movement, the flanges 23 can be moved towards each other within the game game until the proper storage of the
  • Nut element 20 is set on the planet carrier by means of the first bearing 26. This setting is made possible in this exemplary embodiment by an adjusting ring 35, which is axially supported on the one hand on the housing 28 and on the other hand is axially positioned against the second bearing 29. An undesirable axial play between the nut element 20 and the housing is eliminated after the adjustment to such an extent that the planetary screw drive can be operated with high precision.
  • FIG. 4 shows a schematic representation of an actuator for a steering device of a motor vehicle, specifically for a rear axle steering or for a steer-by-wire steering system.
  • An electric motor 36 drives the planet carrier 21 of the
  • Planetary screw drive by means of a belt drive 37.
  • the housing 28 here includes the planetary roller screw drive and the belt drive 37 and protects them
  • the electric motor 36 can be integrated into the housing 28 or flanged to it.
  • a handlebar 38 penetrates the housing 28 and is connected with its fork-shaped ends to wheel control arms, not shown.
  • the threaded spindle 1 is part of the steering rod 38, which is formed from steering rods 39 at the end and the threaded spindle 1 arranged between the steering rods.
  • Control signals are controlled by an ECU - control / regulation unit - 43, which takes into account a large number of parameters on the input and output side, for example, the ACTUAL and TARGET position of the handlebar 38, vehicle speed, steering angle, lateral acceleration.
  • This actuator is designed to be self-locking or inhibiting. If the electric motor fails, the position of the steering rod 38 freezes. Under external forces acting on the handlebar 38, a rotary movement of the planetary roller screw drive, which is set with a sufficiently high preload, is excluded.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Power Steering Mechanism (AREA)
  • Transmission Devices (AREA)

Abstract

L'invention concerne une vis d'entraînement à roulement planétaire comportant une broche filetée (1) ainsi qu'un élément écrou (20) monté sur la broche filetée (1), ledit élément écrou présentant un écrou (2) qui est constitué de parties écrou (3) agencées les unes derrière les autres, le long de la broche filetée (1), ainsi que des satellites (4), répartis sur la périphérie de la broche filetée (1), qui s'engrènent d'une part avec la broche filetée (1) et d'autre part avec l'écrou (2), l'élément écrou (20) étant muni d'un élément de serrage (11) destiné à précontraindre axialement l'écrou (2). Les parties écrou (3) sont précontraintes en appui mutuel au moyen de l'élément de serrage (11) dans la direction axiale.
EP19823766.1A 2019-02-12 2019-12-06 Vis d'entraînement à roulement planétaire et actionneur pour une direction d'essieu arrière d'un véhicule à moteur équipé d'une telle vis d'entraînement à roulement planétaire Pending EP3924645A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019103385.3A DE102019103385A1 (de) 2019-02-12 2019-02-12 Planetenwälzgewindetrieb und Aktuator für eine Hinterachslenkung eines Kraftfahrzeuges mit einem derartigen Planetenwälzgewindetrieb
PCT/DE2019/101049 WO2020164654A1 (fr) 2019-02-12 2019-12-06 Vis d'entraînement à roulement planétaire et actionneur pour une direction d'essieu arrière d'un véhicule à moteur équipé d'une telle vis d'entraînement à roulement planétaire

Publications (1)

Publication Number Publication Date
EP3924645A1 true EP3924645A1 (fr) 2021-12-22

Family

ID=68944126

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19823766.1A Pending EP3924645A1 (fr) 2019-02-12 2019-12-06 Vis d'entraînement à roulement planétaire et actionneur pour une direction d'essieu arrière d'un véhicule à moteur équipé d'une telle vis d'entraînement à roulement planétaire

Country Status (3)

Country Link
EP (1) EP3924645A1 (fr)
DE (1) DE102019103385A1 (fr)
WO (1) WO2020164654A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019125323A1 (de) 2019-09-20 2021-03-25 Schaeffler Technologies AG & Co. KG Planetenwälzgewindetrieb
DE102020103422A1 (de) 2020-02-11 2021-08-12 Schaeffler Technologies AG & Co. KG Planetenwälzgewindetrieb
WO2024041687A1 (fr) 2022-08-23 2024-02-29 Schaeffler Technologies AG & Co. KG Actionneur électromécanique
DE102023117976A1 (de) 2022-08-23 2024-02-29 Schaeffler Technologies AG & Co. KG Elektromechanischer Aktuator

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8601149U1 (de) * 1986-01-18 1986-04-17 Manfred Holzer, Kugelgewindespindeln, GmbH, 7600 Offenburg Kugelumlaufgetriebe
FR2699633B1 (fr) * 1992-12-17 1995-03-10 Aerospatiale Mécanisme de vis à rouleaux, notamment pour engin spatial, et actuateur linéaire comportant un tel mécanisme.
DE19859325A1 (de) * 1998-12-22 2000-06-29 Bosch Gmbh Robert Verfahren zum Betrieb einer elektromechanischen Radbremsvorrichtung
JP3817677B2 (ja) * 2003-05-30 2006-09-06 現代自動車株式会社 独立型ステアバイワイヤシステムのステアリングアクチュエータ
DE102007006321B4 (de) * 2007-02-08 2019-01-31 Schaeffler Technologies AG & Co. KG Kugelgewindetrieb
DE102013213704A1 (de) * 2013-07-12 2015-01-15 Schaeffler Technologies Gmbh & Co. Kg Planetenwälzgewindetrieb
FR3021085B1 (fr) * 2014-05-16 2016-05-27 Thales Sa Dispositif de precharge pour un mecanisme de vis a rouleaux guide en rotation
DE102015212333A1 (de) * 2015-07-01 2017-01-05 Schaeffler Technologies AG & Co. KG Planetenwälzgewindespindeltrieb und Aktor mit selbigem
DE102015225633A1 (de) * 2015-12-17 2017-06-22 Schaeffler Technologies AG & Co. KG Aktor mit Planetenwälzgewindespindeltrieb (PWG)
DE102017124389A1 (de) * 2017-07-03 2018-08-09 Schaeffler Technologies AG & Co. KG Planetenwälzgetriebe

Also Published As

Publication number Publication date
DE102019103385A1 (de) 2020-08-13
WO2020164654A1 (fr) 2020-08-20

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