US20070240532A1 - Spindle Nut for a Ball Screw - Google Patents

Spindle Nut for a Ball Screw Download PDF

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Publication number
US20070240532A1
US20070240532A1 US11/569,632 US56963205A US2007240532A1 US 20070240532 A1 US20070240532 A1 US 20070240532A1 US 56963205 A US56963205 A US 56963205A US 2007240532 A1 US2007240532 A1 US 2007240532A1
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US
United States
Prior art keywords
spindle nut
ball
ball groove
diverting
tool
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.)
Abandoned
Application number
US11/569,632
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English (en)
Inventor
Jurgen Osterlanger
Dieter Adler
Manfred Kraus
Ralf Mayer
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 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 KG filed Critical Schaeffler KG
Assigned to SCHAEFFLER KG reassignment SCHAEFFLER KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ADLER, DIETER, KRAUS, MANFRED, MAYER, RALF, OSTERLANGER, JURGEN
Assigned to SCHAEFFLER KG reassignment SCHAEFFLER KG CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: INA-SCHAEFFLER KG
Publication of US20070240532A1 publication Critical patent/US20070240532A1/en
Priority to US12/871,098 priority Critical patent/US8800129B2/en
Assigned to SCHAEFFLER TECHNOLOGIES GMBH & CO. KG reassignment SCHAEFFLER TECHNOLOGIES GMBH & CO. KG MERGER AND CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SCHAEFFLER KG, SCHAEFFLER VERWALTUNGS DREI KG
Assigned to Schaeffler Technologies AG & Co. KG reassignment Schaeffler Technologies AG & Co. KG CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG
Assigned to SCHAEFFLER TECHNOLOGIES GMBH & CO. KG reassignment SCHAEFFLER TECHNOLOGIES GMBH & CO. KG MERGER AND CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: Schaeffler Technologies AG & Co. KG, SCHAEFFLER VERWALTUNGS 5 GMBH
Assigned to Schaeffler Technologies AG & Co. KG reassignment Schaeffler Technologies AG & Co. KG CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG
Assigned to Schaeffler Technologies AG & Co. KG reassignment Schaeffler Technologies AG & Co. KG CORRECTIVE ASSIGNMENT TO CORRECT THE PROPERTY NUMBERS PREVIOUSLY RECORDED ON REEL 037732 FRAME 0347. ASSIGNOR(S) HEREBY CONFIRMS THE APP. NO. 14/553248 SHOULD BE APP. NO. 14/553258. Assignors: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG
Abandoned legal-status Critical Current

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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
    • F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
    • F16H25/2214—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls with elements for guiding the circulating balls
    • F16H25/2223—Cross over deflectors between adjacent thread turns, e.g. S-form deflectors connecting neighbouring threads
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49995—Shaping one-piece blank by removing material
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49995—Shaping one-piece blank by removing material
    • Y10T29/49996—Successive distinct removal operations
    • 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
    • Y10T74/19744—Rolling element engaging thread
    • Y10T74/19749—Recirculating rolling elements
    • Y10T74/19767—Return path geometry
    • Y10T74/19772—Rolling element deflector

Definitions

  • the present invention relates to a spindle nut for a ball screw.
  • the present invention relates to such ball screws used as electro-mechanical steering aids for steering devices of motor vehicles.
  • a spindle nut for a ball screw is known, for example, which has an endless ball track for balls.
  • a ball groove for balls is provided along a helical line, extending over several threads.
  • a diverting device is provided, in the diverting channels of which balls are deflected from one end of a common thread of the ball groove to the beginning of said common thread of the ball groove.
  • the diverting device is formed by a multitude of diverting pieces, which are each inserted into an opening provided at the periphery of the spindle nut.
  • a ball inlet is formed at the spindle nut, which on the one side is adjacent to the ball groove of the spindle nut and, on the other side, extends to the opening of the spindle nut.
  • This ball inlet is frequently prepared or post processed manually, which is rather expensive.
  • the ball groove provided in the spindle nut frequently and preferably has a so-called gothic profile, i.e. the flanks of the ball groove are larger than the diameter of the balls and intersect at the bottom of the ball groove, such a profile cannot be achieved when producing the ball inlet. Frequently a conical inlet profile develops in the ball inlet.
  • the object of the present invention is to provide a spindle nut according to the features of the preamble of claim 1 , in which the balls can be inserted from the ball groove of the spindle nut into the diverting channel of the diverting device as impact-free as possible and in a low noise manner.
  • the ball inlet may also have a gothic cross-sectional profile.
  • This gothic cross-sectional profile contributes to a flawless introduction of the balls into the diverting channel.
  • the ball inlet begins, as seen in the longitudinal cross-section, at the ball groove, thus connects here, and ends at the diverting channel, with the ball inlet, extending along the way radially outwardly, preferably rising in a steady curve.
  • the ball inlet When the ball groove is laid out in a plane, the ball inlet has a preferably convex form, preferably the so-called gothic profile seen in the cross-section.
  • the same embodiment of the cross-section of the ball inlet and the ball groove also allows an corner-free transfer from the ball groove to the ball inlet and therefrom to the diverting channel of the diverting device.
  • profiles may also be suitable that are created such that the balls can be guided therein.
  • the ball inlet measured around the rotational axis of the spindle nut, extends over an angle ⁇ of up to 60 degrees, preferably up to 20 degrees, with the angle beginning at the opening and ending at the ball groove.
  • An angle of approx. 4 degree is recommended as the lower limit.
  • a ball screws is known in which the spindle nut is provided with two openings arranged at the periphery, between which a ball groove extends over several threads.
  • an exterior diverter is provided, having the diverting channel.
  • This so-called exterior diverter can be formed by a pipe, for example, with its one end engaging one opening and its other end engaging another opening, while according to the invention the ball inlet, measured around the rotational axis of the spindle nut, extends over an angle ranging up to 360 degrees, with this angle beginning at the opening and ending at the ball groove.
  • small angles are beneficial, preferably 180 degrees.
  • the advantage of an only gradual stress and release of the balls is emphasized even more.
  • the advantage of the large inlet angle is particularly beneficial: the unsteadiness in the stiffness-behavior of the ball screw is caused by the incline of the ball groove.
  • the ball inlet passes once through the level in which the lateral force impacts. The wider the inlet angle, the gentler the inlet of the balls into the diverting channel or out of the diverting channel.
  • the angle both in individual diverting as well as in the last described exterior diverting can also occur preferably under consideration of the operational load.
  • the balls give.
  • the length of the ball inlet may be approximately equivalent to the size of the maximum ball compression. This means, that first the ball, being fully stressed, is elastically deformed and then elastically releases when entering the ball inlet and at the end of the ball inlet, thus when entering the diverting channel of the diverting device, returns to its original ball shape.
  • the length of the ball inlet can therefore also correspond to the deformation behavior of the balls used.
  • spindle nuts can be provided with angles of the ball inlets adjusted to the ball compression in which a very low-nose inlet of the balls from the ball groove into the diverting channel of the diverting device can be ensured.
  • a method for producing a spindle nut for a ball screw is suggested.
  • This method provides that a ball groove for the balls can be inserted at the inner periphery of the spindle nut, around its rotational axis and along a helical line, with a cutting tool.
  • This ball groove extends over at least one thread. Beginning at least at one point of the ball groove and, depending on the relative rotary progression of the tool in reference to the spindle nut, the tool now radially approaches in order to remove more material from the spindle nut.
  • both the ball groove as well as the ball inlet can be formed by only one tool.
  • the step of removing one tool and attaching another tool in order to perhaps form the ball groove, it is ensured that the transfer from the ball groove to the ball inlet occurs without edges and smoothly. Additionally, no manual processing is necessary.
  • the tool is preferably provided with a gothic profile it is also ensured that both the ball groove as well as the ball inlet have a gothic cross-sectional profile.
  • This method can preferably further developed such that first, preferably in a separation process, the opening is provided at the periphery of the spindle nut and adjacent thereto the ball groove with the ball inlet is created. Therefore the tool passes, radially approaching, the area of the opening and then removes more material at the spindle nut.
  • first the ball groove can be formed with at least one ball inlet and adjacent thereto, also preferably in a separation process, the opening is made at the periphery of the spindle nut.
  • the tool is preferably a rotating cutting tool with its rotational axis preferably being arranged perpendicular to the ball groove, with the rotating sleeve of the tool having the mating profile of the ball groove and the ball inlet in a cross-section through the cutting tool.
  • Such cutting tools can beneficially be provided for the production of large numbers of spindle nuts.
  • This tool is not limited in its shape to a profiled cutting disk.
  • a small tool can be moved laterally to the extension of the ball groove in order to create the cross-sectional profile of the ball groove and the ball inlet.
  • the spindle nut is provided with a multitude of openings distributed over its periphery, in each of which a diverting piece can be inserted having a diverting channel in order to deflect the balls from the beginning to the end of a common thread of the ball groove.
  • the openings Seen in the axial direction of the spindle nut, the openings separate one shoulder of the ball groove each, with openings arranged circumferentially adjacent to one another penetrating a common thread and with the ball inlet being produced by the radial approach of the tool at the one opening and by the reversal of the approach at the other opening arranged adjacent to the one opening.
  • the ball groove provided along the helical line does not require processing up to the face of the spindle nut, because at least a portion of the last thread of the ball groove forms the dead travel area. This way, the processing expense can be further reduced at the spindle nut.
  • FIG. 1 is a perspective view of a spindle nut according to the invention
  • FIG. 2 is a cross-sectional view through a ball groove provided in a spindle nut according to FIG. 1 ;
  • FIG. 3 is a layout of the ball groove shown in FIG. 2 ;
  • FIG. 4 is a cross-sectional view of a spindle nut according to the invention.
  • FIG. 5 is a cross-sectional view of a spindle according to the invention sectioned along a ball groove, laid out into a plane;
  • FIG. 6 is a perspective view of another spindle nut according to the invention.
  • FIG. 7 is a longitudinal cross-section of the spindle nut of FIG. 6 ;
  • FIG. 8 is a lateral cross0sectional view of the spindle nut of FIG. 6 ;
  • FIG. 9 is a layout of the ball groove of the spindle nut according to FIG. 6 in a schematic view.
  • the first exemplary embodiment according to the FIGS. 1 through 5 shows a spindle nut with a so-called individual diverting.
  • This spindle nut is provided with an endless ball track 1 for balls 2 (see FIG. 4 ). It is discernible from FIG. 1 that a ball groove 3 is formed for balls 2 at the inner periphery of the spindle nut around the rotational axis of the spindle nut and along a helical line. This ball groove 3 extends over several threads 4 . Further, a diverting device 5 is provided in order to deflect balls 2 from the beginning to the end of a common thread 4 .
  • This diverting device 5 comprises a multitude of diverting pieces 6 , each of which is inserted into an opening 7 provided at the periphery of the spindle nut ( FIG. 1 .).
  • the spindle nut has a multitude of openings 7 . It is discernible from FIG. 1 that each opening 7 penetrates a shoulder 8 of the ball groove 3 . This shoulder 8 lies, when looking at the spindle nut sectioned longitudinally, between two sections of the ball groove 3 arranged axially adjacent to one another.
  • the diverting pieces 6 inserted into said openings 7 have a diverting channel 9 , as shown in FIG. 4 .
  • the ball groove 3 has a gothic cross-sectional profile 10 , as shown schematically in FIG. 2 . It is discernible from this figure that the shape of the gothic profile 10 deviates from the circular shape, which is indicated here in dot-dash lines. At the bottom 11 of the ball groove 3 the two flanks 12 of the ball groove 3 intersect. It is discernible from FIG. 2 that a distance exists between the bottom 11 and the marked circle, while in the area of the flanks 12 the circle is tangent to said flanks 11 .
  • FIG. 4 shows the transfer from the ball groove 3 to the diverting channel 9 in a partial cross-section through the spindle nut.
  • This ball inlet also has a gothic profile, in the cross-sectional view, which is equivalent to the gothic profile 10 of the ball groove 3 .
  • the length of the ball inlet 13 along the ball groove 3 is approximately equivalent to an angle ⁇ around the axis of the spindle nut, which angle may amount up to 60 degrees.
  • this ball inlet 13 connects to the ball groove 3 of the spindle nut in a corner-free manner and, on the other side, connects to the diverting piece 6 of the diverting channel 9 . It is further discernible from FIG. 4 that the ball inlet 13 , beginning at the ball groove 3 and ending at the diverting channel 9 , rises outwardly in a constant curve. This contour is formed convexly, seen in this cross-section. Further, FIG. 4 clearly shows that the ball inlet 13 extends to the opening 7 .
  • FIG. 5 clarifies once more the convex embodiment of the ball inlet 13 in the layout of the spindle nut, as sectionally shown in FIG. 5 .
  • this spindle nut beneficially the following method according to the invention is suggested.
  • the ball groove 3 for the balls is incorporated in a cutting manner at the inner periphery of the spindle nut around its rotational axis and along a helical line with a tool, not shown.
  • the tool moves radially outward in order to remove more material from the spindle nut.
  • first the ball inlet 13 is made shown in FIG. 4 .
  • Opening 7 is located between these two points mentioned the, to which the ball inlet 13 extends.
  • the opening 7 is preferably produced in a separating process, for example by stamping. Subsequently the ball groove 3 with the ball entry 13 can be produced in the manner described.
  • the ball groove 3 can also be produced first with the ball entry 13 and subsequently the opening 7 can also be produced preferably in a separating process.
  • the other ball inlets can be made in a single process arranged behind one another in the circumferential direction and along a helical line using the tool mentioned.
  • the tool In order to produce a first ball inlet the tool radially approaches in the described manner during the rotary progression of the tool in reference to the spindle nut. In this radially approached position the tool now proceeds along the helical line until it reaches the area of the opening adjacent in the circumferential direction.
  • the tool can be further radially moved during the relative rotary progress of the tool in reference to the spindle nut so that the tool, when leaving the area of the subsequent opening and reaching the level of the ball groove, has made another ball inlet.
  • a so-called dead travel is located, which no balls can enter in such ball screws. The mandatory existence of this dead travel provides that the tool no longer needs to be radially distanced between the two ball inlets.
  • the length of the ball inlets (see FIG. 4 ), measured along the helical line, is here equivalent to an approximately maximum compression of the balls 2 , said compression being a consequence of the stress on the balls 2 .
  • the described production process of the ball inlets 13 is schematically shown in FIG. 3 , with the movement process of the tool, not shown, occurs from the left to the right.
  • the reference characters provided in FIG. 3 each name the radial level of the tool in the individual sections, which are divided as follows: 7 ′ indicates the area inside an opening 7 , followed by the area 13 ′ for producing the ball inlet 13 .
  • the tool is finally on the level of the ball groove 3 , which here is indicated with the reference character 3 ′.
  • the tool now proceeds over approximately one thread along the ball groove 3 .
  • the area 13 ′ follows for producing another ball inlet 13 .
  • the tool remains in the approached position and now passes the so-called dead travel area T and continues to proceed into the area of the next opening 7 , which is here indicated with 7 ′.
  • the radial approach of the tool is reversed so that the next ball inlet 13 is produced, which is here indicated with the reference character 13 ′. From here, the described cycle is repeated.
  • FIGS. 6 through 9 A ball screw provided with a so-called exterior diverting is shown in FIGS. 6 through 9 .
  • FIG. 6 shows another spindle nut according to the invention in a perspective view, provided with a ball groove 14 at the interior. Further, at the periphery of the spindle nut two openings are provided, for example with a pipe-shaped exterior diverting, not shown, with two pipe ends each engaging an opening. As in the previous exemplary embodiments, here too ball inlets 16 are provided, shown in FIG. 7 .
  • FIG. 8 shows a cross-section through the spindle nut in the area of the openings 15 .
  • FIG. 9 shows, in a sectional view, the spindle nut with the ball groove 14 in a laid out form.
  • the embodiment of the openings 15 , the ball inlets 16 , and the ball grooves 14 are discernible from this schematic representation.
  • This layout of the ball groove shown is only schematically, though. In particular the area of the ball inlet 16 may extend to a full thread along the helical track.
US11/569,632 2004-05-26 2005-05-14 Spindle Nut for a Ball Screw Abandoned US20070240532A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/871,098 US8800129B2 (en) 2004-05-26 2010-08-30 Method for producing a spindle nut for a ball screw

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004025683A DE102004025683A1 (de) 2004-05-26 2004-05-26 Spindelmutter für einen Kugelgewindetrieb
DE102004025683.7 2004-05-26
PCT/EP2005/005319 WO2005119094A1 (de) 2004-05-26 2005-05-14 Spindelmutter für einen kugelgewindetrieb

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/005319 A-371-Of-International WO2005119094A1 (de) 2004-05-26 2005-05-14 Spindelmutter für einen kugelgewindetrieb

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/871,098 Division US8800129B2 (en) 2004-05-26 2010-08-30 Method for producing a spindle nut for a ball screw

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US20070240532A1 true US20070240532A1 (en) 2007-10-18

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Family Applications (2)

Application Number Title Priority Date Filing Date
US11/569,632 Abandoned US20070240532A1 (en) 2004-05-26 2005-05-14 Spindle Nut for a Ball Screw
US12/871,098 Active 2028-02-25 US8800129B2 (en) 2004-05-26 2010-08-30 Method for producing a spindle nut for a ball screw

Family Applications After (1)

Application Number Title Priority Date Filing Date
US12/871,098 Active 2028-02-25 US8800129B2 (en) 2004-05-26 2010-08-30 Method for producing a spindle nut for a ball screw

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US (2) US20070240532A1 (de)
EP (1) EP1749158B1 (de)
JP (1) JP4910110B2 (de)
CN (1) CN100595451C (de)
AT (1) ATE441048T1 (de)
BR (1) BRPI0510653A (de)
DE (2) DE102004025683A1 (de)
WO (1) WO2005119094A1 (de)

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US20100132494A1 (en) * 2007-03-12 2010-06-03 Sentarou Sugita Ball screw device having tunnel raceway, and method for manufacturing the same
US20120192667A1 (en) * 2011-01-29 2012-08-02 Sin-He Chen Ball screw with a circulating assembly
US20130133453A1 (en) * 2011-11-28 2013-05-30 Yan-Yu Chen Internal circulation ball screw
US20140238166A1 (en) * 2013-02-28 2014-08-28 Mando Corporation Electric power steering apparatus of ball screw type
US20170335934A1 (en) * 2015-02-04 2017-11-23 Ntn Corporation Bridge-Type Ball Screw And Manufacturing Method Thereof
US20180087635A1 (en) * 2015-05-27 2018-03-29 Schaeffler Technologies AG & Co. KG Ball screw drive
WO2021034200A1 (en) 2019-08-17 2021-02-25 Excess Engineering As Linear actuator

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WO2011040296A1 (ja) * 2009-09-29 2011-04-07 Ntn株式会社 グリーンボールの研磨方法、セラミックス球の製造方法および研磨装置
DE102011076438B4 (de) * 2011-05-25 2020-03-12 Aktiebolaget Skf Konzept für eine Mutter oder Spindel eines Wälzgewindetriebs
DE102011055416B4 (de) 2011-11-16 2022-09-29 Paul Hettich Gmbh & Co. Kg Teleskopierbare Hubsäule eines Möbelteils
CN105834686A (zh) * 2016-04-26 2016-08-10 苏州昭沃五金科技有限公司 一种连接螺母的制备工艺
CN109937316B (zh) * 2016-11-14 2022-09-13 日本精工株式会社 滚珠丝杠
PL3971448T3 (pl) 2020-09-22 2023-06-26 SFS Group International AG Nakrętka śruby pociągowej do napędu mechanizmu śrubowo-tocznego

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US20100132494A1 (en) * 2007-03-12 2010-06-03 Sentarou Sugita Ball screw device having tunnel raceway, and method for manufacturing the same
US9151371B2 (en) * 2007-03-12 2015-10-06 Abom Co., Ltd. Ball screw device having tunnel raceway
US20120192667A1 (en) * 2011-01-29 2012-08-02 Sin-He Chen Ball screw with a circulating assembly
US8813596B2 (en) * 2011-01-29 2014-08-26 Hiwin Technologies Corporation Ball screw with a circulating assembly
US20130133453A1 (en) * 2011-11-28 2013-05-30 Yan-Yu Chen Internal circulation ball screw
US9010210B2 (en) * 2011-11-28 2015-04-21 Hiwin Technololgies Corp. Internal circulation ball screw
US20140238166A1 (en) * 2013-02-28 2014-08-28 Mando Corporation Electric power steering apparatus of ball screw type
US9266555B2 (en) * 2013-02-28 2016-02-23 Mando Corporation Electric power steering apparatus of ball screw type
US20170335934A1 (en) * 2015-02-04 2017-11-23 Ntn Corporation Bridge-Type Ball Screw And Manufacturing Method Thereof
US10677328B2 (en) * 2015-02-04 2020-06-09 Ntn Corporation Bridge-type ball screw and manufacturing method thereof
US20180087635A1 (en) * 2015-05-27 2018-03-29 Schaeffler Technologies AG & Co. KG Ball screw drive
WO2021034200A1 (en) 2019-08-17 2021-02-25 Excess Engineering As Linear actuator

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BRPI0510653A (pt) 2007-11-20
CN100595451C (zh) 2010-03-24
ATE441048T1 (de) 2009-09-15
EP1749158A1 (de) 2007-02-07
DE502005007989D1 (de) 2009-10-08
WO2005119094A1 (de) 2005-12-15
US20110035930A1 (en) 2011-02-17
US8800129B2 (en) 2014-08-12
JP4910110B2 (ja) 2012-04-04
JP2008500500A (ja) 2008-01-10
DE102004025683A1 (de) 2005-12-15
EP1749158B1 (de) 2009-08-26
CN1973151A (zh) 2007-05-30

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