EP2903881A1 - Vis à billes et direction assistée comportant une vis à billes - Google Patents

Vis à billes et direction assistée comportant une vis à billes

Info

Publication number
EP2903881A1
EP2903881A1 EP13782655.8A EP13782655A EP2903881A1 EP 2903881 A1 EP2903881 A1 EP 2903881A1 EP 13782655 A EP13782655 A EP 13782655A EP 2903881 A1 EP2903881 A1 EP 2903881A1
Authority
EP
European Patent Office
Prior art keywords
threaded spindle
ball screw
ball nut
internal thread
contour
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Withdrawn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
EP13782655.8A
Other languages
German (de)
English (en)
Inventor
Klaus Peterreins
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 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 Presta AG filed Critical ThyssenKrupp Presta AG
Publication of EP2903881A1 publication Critical patent/EP2903881A1/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Withdrawn legal-status Critical Current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
    • B62D3/00—Steering gears
    • B62D3/02—Steering gears mechanical
    • B62D3/04—Steering gears mechanical of worm type
    • B62D3/06—Steering gears mechanical of worm type with screw and nut
    • B62D3/08—Steering gears mechanical of worm type with screw and nut using intermediate balls or the like
    • 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
    • B62D5/0445—Screw drives
    • B62D5/0448—Ball 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
    • F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
    • F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
    • 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
    • F16H2025/2445—Supports or other means for compensating misalignment or offset between screw and nut
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19642—Directly cooperating gears
    • Y10T74/19698—Spiral
    • Y10T74/19702—Screw and nut
    • Y10T74/19721—Thread geometry

Definitions

  • the present invention relates to a ball screw according to the preamble of independent claim 1 and a power steering according to the preamble of independent claim 5.
  • the document DE 10 2009 019 227 AI discloses a guide bush having a contour adapted to more bending surface for bending loads for To provide the rack, so that a plastic deformation of the rack is counteracted. The rack is supported in the outside area, the internal thread of the ball screw is not affected.
  • the document GB 952 782 A shows a screwdriver for aircraft construction.
  • the nut is designed so that it can invest differently to the spindle.
  • the envelope of the space between the threads of the nut is formed spherically. As a result, the average flank angle of the effectively intermeshing threads varies.
  • the advantage of such an embodiment is that the abrasion of the thread is uniform and that used
  • Lubricant is used more effectively.
  • Such a steering device usually comprises a steering housing in which a rack connected to a steering column for the deflection of vehicle wheels is mounted axially displaceable. About the displacement of the rack, a steering angle is changed in a known manner, which means that the rack is coupled via corresponding wishbones or tie rods and similar mechanical connections with the wheels to be steered.
  • the ball screw which comprises a threaded spindle which is coupled to the rack, that is incorporated in a longitudinally movable mechanical strand.
  • the threaded spindle is also moved as the rack is moved.
  • On the threaded spindle runs in a known manner a position-fixed ball nut.
  • the ball nut can be driven for example via a drive motor by means of a belt. This motor is used to assist the driver-initiated steering movement after the nut has been actively turned and, as a result, the lead screw and rack are being moved.
  • the ball screw is usually exposed during operation mechanical stresses that can be caused on the one hand by the construction of the belt connection to the drive motor and on the other hand by a force input from the tie rods.
  • the force application in the axial direction on the threaded spindle causes a bending stress of the threaded spindle, whereby the spindle is bent. Due to the bending of the threaded spindle, the ball screw or the balls in turn experiences a higher load and thus increased wear.
  • a force can be exerted on the threaded spindle by the belt tension between the motor and a pulley, which leads to a tilting / entanglement of the ball nut and thus to increased wear in the ball screw.
  • a ball screw to solve the inventive task has the features of the independent claim 1.
  • a ball screw in particular for a power steering, proposed having a substantially cylindrical threaded spindle with an external thread and a ball nut having an at least partially cylindrical internal thread in a receptacle and is guided over a number of balls on the threaded spindle, wherein the threaded spindle concentric is arranged in the receptacle, and wherein the internal thread in a end region has a convex contour. Due to the enlargement of the receptacle in the end region of the internal thread, in the case of an elastic bending of the spindle, it can rest over an entire receiving region. The usually occurring game in the end region can thus be avoided in the direction of the bend, whereby the wear, for example, the balls can be reduced.
  • the at least one end region has a contour which corresponds essentially to a contour of a threaded spindle deformed by a bending load. This results in two corresponding surface, which in particular more balls are in radial engagement with the two threads. As a result, a load of the ball screw can be increased.
  • the respective end portions of the ball nut may be arranged at a greater distance from the threaded spindle. If a diameter in the end region of the internal thread is slightly larger than the remaining nominal diameter of the other th cylindrical trained internal thread, thereby the spindle stressed by the bending load can better adapt to the contour of the recording. This adaptation of the contours causes a better distribution of force over a longitudinal extent in the ball screw. Furthermore, it can be advantageously provided that the internal thread in a longitudinal extent has a curved, concave, convex, conical or the like formed contour, wherein preferably one or more threads have a different distance from the threaded spindle.
  • the end region is designed in such a way that, in the case of a threaded spindle bent elastically by axial loading, the curved contour essentially corresponds to the contour of the end region, for which reason the balls are loaded uniformly.
  • a power steering for solving the inventive task has the features of independent claim 5.
  • a power steering in particular for a motor vehicle, proposed having a ball screw with a threaded spindle and a ball nut arranged thereon, wherein the threaded spindle is arranged with an external thread concentric in a receptacle of the ball nut with an internal thread and threaded spindle and ball nut relative to each other are movable, wherein the internal thread has at least partially a convex contour.
  • the spindle deformed under a bending load can adapt better to it, in particular in an end region of the internal thread, resulting in a more uniform distribution of a radial load on the ball arranged between the spindle and the ball nut.
  • FIG. 1 shows a detail of a cross-sectional view of a conventional ball screw
  • 2 shows a detail of a cross-sectional view of an inventive ball screw
  • Fig. 3 is a view of an end portion of a ball nut in one
  • a ball screw 10 has at least one ball nut 11 and a threaded spindle 12, wherein the ball nut 11 is arranged on the threaded spindle 12 and the two components are movable relative to each other.
  • the ball nut 11 has an internal thread 13 and the threaded spindle on an external thread 14, wherein the two threads 13, 14 correspond to each other and balls 15 are arranged in respective threads 16.
  • the ball screw 10 is connected via a belt with an electric servomotor, for example, the ball nut 11 is set in a rotational movement. Since the ball nut 11 is arranged positionally stable in the ball screw 10, the threaded spindle 12 is moved in an axial direction by the rotational movement of the ball nut 11. Depending on the direction of rotation in a left or right direction.
  • the illustrated ball screw 10 is preferably part of a steering device of a motor vehicle, wherein the ball screw 10 is arranged in a steering force support device.
  • the threaded spindle 12 of the ball screw 10 is directly or indirectly connected to tie rods at respective ends, which provide for a steering movement of wheels of the vehicle.
  • the axial movement of the spindle 12 also causes the tie rods to move axially, allowing the wheels to steer the vehicle to the left or to the right.
  • the spindle 12 may be positioned fixed and the ball nut 11 is movable in a transverse direction of the vehicle, in this alternative, the ball nut 11 is directly or indirectly connected to the tie rods.
  • the internal thread 13 of the ball nut 11 is positioned in a receptacle in which the substantially cylindrical threaded spindle 12 is arranged.
  • the internal thread 13 and the receptacle is formed substantially cylindrical, which is why the cylindrical threaded spindle 12 is arranged concentrically in the receptacle.
  • a thread pitch of the internal thread 13 corresponds to a thread pitch of the external thread 14 of the threaded spindle, for which reason the balls 15 arranged in each case partially in the threads 16 of the internal and external threads 13, 14 run essentially without play in the threads 16.
  • a registered by the rotational movement of the ball nut 11 in the threaded spindle 12 force is transmitted via the balls 15 and thereby generates the translational movement of the threaded spindle 12th
  • the receptacle is not cylindrical, but has a larger diameter of the internal thread 13 relative to the cylindrical part of the receptacle.
  • the two end regions 17 have a convex contour.
  • the contour of the end regions 17 may also be concave, conical or generally curved. Due to the convex contour of the end regions 17, at least part of a revolution of the thread 16 also has a larger nominal diameter than the revolutions of the thread 16 in the cylindrically shaped region. It can also have several rounds a larger nominal diameter, in which case the nominal diameter to a respective outer end of the internal thread 13 is larger. This is shown in FIG. 2.
  • the spherical contour of the end portion 17 substantially corresponds to a bending deformation of the threaded spindle 12, which occurs when axial forces on the tie rods, which can occur due to the operation of the vehicle, are transmitted to the threaded spindle 12. These axial forces create a bending moment in the threaded spindle 12, whereby it preferably elastically bends. In a completely cylindrical ball nut 11 so the balls would be exposed to a different radial load over the length of the internal thread be, with just the balls 15 which are located in the outer revolutions of the thread 16, would be more radially loaded. Due to the convex contour of the end portion 17, the balls are now evenly loaded in spite of a bending of the threaded spindle 12, whereby a supporting portion is evenly distributed. The carrying portion of the balls located in the edge region 17 is thereby reduced.
  • the larger diameter end portions 17 with a convex contour can also counteract tilting / entanglement of the ball nut 11.
  • a belt tension between a pulley, which is usually connected to the ball nut 11, and the electric motor the ball nut 11 is regularly exposed to such a large radial force, that it tilts with respect to the longitudinal axis, and therefore with the inventive design of the end portions a uniform distribution the carrying capacity of the individual balls is achieved.
  • the nominal diameter has a mean distance h 1 from the spindle, this distance increasing towards the end regions, and therefore a distance in the end region h 1 + x.
  • the distance is determined, for example, by a respective center of the corresponding thread 16, which is why the x can be variable if the spherical shape of the end portion 17 is so large that more than one revolution of the thread 16 has a different distance than the average distance hl.
  • the end regions 17 on both sides of the ball nut can be dimensioned such that the internal thread 13 in the receptacle over its entire longitudinal extent has a convex contour, wherein a radial center is an axis of symmetry and the distance hl to the threaded spindle 12 has.
  • the remaining revolutions of the thread 16 accordingly have a distance hl + x increasing in the direction of the respective outer ends.
  • the internal thread 13 has a concave contour.
  • the invention is characterized by a ball screw 10 with a threaded spindle 12 and disposed thereon a ball nut 11 from the threaded spindle 12 ge ⁇ via balls 15 in the ball nut 11 and an internal thread 13 of the ball nut 11 at least teilwei- se a spherically formed contour having. Furthermore, concerns the He ⁇ -making power steering, having such a ball screw 10th

Landscapes

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

Abstract

L'invention concerne une vis à billes (10) comportant une vis (12) et un écrou à billes (11) disposé sur la vis, la vis (12) étant guidée au moyen de billes (15) dans l'écrou à billes (11) et un filetage femelle (13) de l'écrou à billes (11) présentant au moins par endroits un contour conçu de façon bombée. L'invention concerne également une direction assistée présentant une telle vis à billes (10).
EP13782655.8A 2012-10-01 2013-09-17 Vis à billes et direction assistée comportant une vis à billes Withdrawn EP2903881A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012019227.4A DE102012019227B4 (de) 2012-10-01 2012-10-01 Kugelgewindetrieb und Servolenkung mit einem Kugelgewindetrieb
PCT/EP2013/002797 WO2014053215A1 (fr) 2012-10-01 2013-09-17 Vis à billes et direction assistée comportant une vis à billes

Publications (1)

Publication Number Publication Date
EP2903881A1 true EP2903881A1 (fr) 2015-08-12

Family

ID=49485691

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13782655.8A Withdrawn EP2903881A1 (fr) 2012-10-01 2013-09-17 Vis à billes et direction assistée comportant une vis à billes

Country Status (5)

Country Link
US (1) US20150329138A1 (fr)
EP (1) EP2903881A1 (fr)
CN (1) CN104684789B (fr)
DE (1) DE102012019227B4 (fr)
WO (1) WO2014053215A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014008961B4 (de) * 2014-06-23 2016-12-15 Thyssenkrupp Presta Ag Lenkgetriebe mit deachsierter Zahnstange
FR3028717B1 (fr) * 2014-11-25 2017-03-31 Pellenc Sa Outil electroportatif a transmission protegee.
US9470296B1 (en) * 2015-04-17 2016-10-18 Trw Automotive U.S. Llc Anti-lash assembly for vehicle power steering
DE102016113803A1 (de) * 2015-07-28 2017-02-02 Steering Solutions Ip Holding Corporation Riemenscheibenbaugruppe mit leerlaufrolle, kraftunterstützungssystem mit riemenscheibenbaugruppe und verfahren
DE102015013648A1 (de) 2015-10-22 2017-04-27 Thyssenkrupp Ag Kugelrückführung mit axial montierbarer Befestigungshülse
DE102016007542A1 (de) 2016-06-22 2017-12-28 Thyssenkrupp Ag Kugelgewindetrieb einer elektromechanischen Servolenkung mit Umlenkkörper für eine Kugelrückführung
US10865862B2 (en) * 2018-08-27 2020-12-15 Hitachi Automotive Systems Americas, Inc. Pulley and ball nut assembly
US11465673B2 (en) * 2019-04-25 2022-10-11 Schaeffler Technologies AG & Co. KG Motor-assisted steering ball-screw

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US2508261A (en) * 1948-07-07 1950-05-16 Donald W Hosler Antifriction screw device
US2779206A (en) * 1955-08-18 1957-01-29 Gen Motors Corp Ball nut screw assembly
GB952782A (en) 1961-11-08 1964-03-18 Vickers Armstrongs Aircraft Improvements in screw-and-nut assemblies
US3393574A (en) * 1967-04-21 1968-07-23 Roantree Electro Mech Corp Variable speed screw gearing mechanism
DE4412539C2 (de) * 1993-04-12 2002-06-27 Nsk Ltd Kugelumlaufspindel
DE19911432A1 (de) * 1999-03-05 2000-09-21 Brose Fahrzeugteile Schnecken- oder Spindelgetriebe
JP2002039316A (ja) * 2000-07-25 2002-02-06 Isel Co Ltd ボールねじ
US6702060B2 (en) * 2001-06-27 2004-03-09 Nsk Ltd. Electric power steering apparatus
JP4729821B2 (ja) * 2001-08-03 2011-07-20 日本精工株式会社 ボールねじ
JP4665365B2 (ja) * 2001-09-12 2011-04-06 株式会社ジェイテクト ボールねじ装置
SE0501365L (sv) * 2005-06-16 2006-12-12 Aritco Lift Ab Anordning vid kraftöverföring samt mutter avsedd att ingå i en anordning för kraftöverföring
DE102008050595A1 (de) * 2008-10-09 2010-06-24 Thyssenkrupp Presta Ag Hydrostatischer Antrieb für ein Lenksystem
DE102009002660A1 (de) 2009-04-27 2010-10-28 Zf Lenksysteme Gmbh Servolenkung für ein Kraftfahrzeug
DE102009019227A1 (de) 2009-04-28 2011-01-13 Ledon Lighting Jennersdorf Gmbh LED lamp
JP2014105802A (ja) * 2012-11-28 2014-06-09 Jtekt Corp ボールねじ、およびボールねじを有する電動パワーステアリング装置
DE102014002286A1 (de) * 2013-02-28 2014-08-28 Mando Corporation Elektrische Servolenkungsvorrichtung vom Kugelumlaufspindeltyp

Non-Patent Citations (2)

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See also references of WO2014053215A1 *

Also Published As

Publication number Publication date
DE102012019227A1 (de) 2014-04-03
WO2014053215A1 (fr) 2014-04-10
DE102012019227B4 (de) 2019-01-10
US20150329138A1 (en) 2015-11-19
CN104684789A (zh) 2015-06-03
CN104684789B (zh) 2017-06-20

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