WO2019015710A1 - Écrou fileté pour une vis d'entraînement à billes - Google Patents

Écrou fileté pour une vis d'entraînement à billes Download PDF

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Publication number
WO2019015710A1
WO2019015710A1 PCT/DE2018/100549 DE2018100549W WO2019015710A1 WO 2019015710 A1 WO2019015710 A1 WO 2019015710A1 DE 2018100549 W DE2018100549 W DE 2018100549W WO 2019015710 A1 WO2019015710 A1 WO 2019015710A1
Authority
WO
WIPO (PCT)
Prior art keywords
deflection
ball
sleeve
bore
threaded nut
Prior art date
Application number
PCT/DE2018/100549
Other languages
German (de)
English (en)
Inventor
Stefan Michaloudis
Stephan Ruffershöfer
Dieter Adler
Armin Gerner
Jürgen Engel
Original Assignee
Schaeffler Technologies AG & 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 & Co. KG filed Critical Schaeffler Technologies AG & Co. KG
Publication of WO2019015710A1 publication Critical patent/WO2019015710A1/fr

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
    • F16H25/2204—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

Definitions

  • the invention relates to a suitable for a ball screw nut with an external deflection for ball recirculation. Furthermore, the invention relates to a method for producing a threaded nut.
  • a ball screw generally comprises a threaded spindle, a threaded nut, as well as between the threaded spindle and the threaded nut rolling rolling elements, namely balls. If a ball screw has a ball return, then the setting range of the ball screw is in principle not limited. This applies to a catchy as well as a multi-speed ball screw.
  • a ball return can be designed either as a single deflection, front deflection or as external deflection.
  • the outer deflection claimed in comparison to the individual deflection more space in the radial direction, but has the advantage that the balls can be promoted over several turns away in the thread of the ball screw back, which is associated with a broader load-bearing area of the ball screw.
  • DE 10 2009 009 851 A1 discloses.
  • a ball screw disclosed in DE 10 2012 213 856 A1 has a threaded nut inside the wall thickness of which a straight return channel for ball return is arranged.
  • Another design of a ball screw with ball return is in the
  • the threaded nut has a nut body, which is also referred to as a ball nut.
  • a formed on the inside of the threaded nut thread allows, together with a threaded spindle, the rolling of balls in a load-bearing channel of a ball screw.
  • the threaded nut on a multi-part outer deflection through which a deflection channel is formed for the return of balls in the thread.
  • the load-bearing channel of the ball screw As well as for the introduction of balls in the load-bearing channel are located in the mother body bores, in each of which a ball sleeve is inserted.
  • a solid, material, positive or non-positive connection between the mother body and each ball sleeve is already made before the nut is completed with other parts.
  • a deflection base defining the deflection channel radially inwardly engages, at least partially, in the bore located in the nut base body.
  • the deflection base has a middle, preferably curved, the outer contour of the mother body adapted portion and two to the middle section subsequent, pointing in the direction of each bore, pin-shaped sections.
  • a partial engagement of the deflection base in a bore of the nut base body is understood to mean a configuration in which the end face of a peg-shaped section, ie end section, of the deflection base is not arranged with its entire circumference within the bore, but partially in the lateral direction is called radial direction of the bore and the pin-shaped portion, protrudes beyond the bore.
  • the ball sleeve is preferably formed as a metal sleeve, in particular sheet metal sleeve.
  • other materials are suitable for the manufacture of the ball sleeve sleeve, which are harder than those materials through which the deflection of two ball shells connecting each other is formed.
  • Such materials are, for example, ceramic materials or particularly wear-resistant plastics.
  • this preferably has a cylindrical portion and two adjoining these, extending in opposite axial directions of the cylindrical portion, for example, diametrically opposed, formed as lobes noses.
  • One of the lobes is used for the discharge of balls from the load-bearing channel, the other lobe as anti-rotation of the ball sleeve inside the outer deflection.
  • the ball sleeve sleeve with respect to an axis which extends transversely to the longitudinal axis of the ball sleeve sleeve be formed rotationally symmetrical with respect to a rotation of 180 °.
  • This is synonymous with an identical geometry and diametrical arrangement of the two lobes.
  • the two lobes match their shape, but - viewed in the longitudinal direction of the ball sleeve sleeve - offset by an angle deviating from 180 ° to each other.
  • incorrect assembly of the ball sleeve is excluded.
  • the ball sleeve is bent as a slotted sleeve made of sheet metal.
  • the ball sleeve may be a non-slotted sleeve.
  • the high strength of the ball sleeve sleeve is particularly advantageous in the region of the tabs formed on the cylindrical section.
  • hard ball sleeve sleeve assembly technology is an integral part of the ball nut.
  • the fixed seat of the ball sleeve sleeves in the mother body has the particular advantage that it can come at the ball circulation within the ball screw to any malfunction in the transition between the load channel and the deflection, that is, the ball return channel serving.
  • the bore in the mother body, in which the ball sleeve is to be used compared to conceivable designs in which a clearance between ball sleeve and bore exists, be dimensioned smaller, which is associated with increased stability and wear resistance of the ball nut.
  • the deflection base which is placed as a component of the outer deflection on the ball sleeve sleeves, is preferably made of plastic, wherein the central, curved portion of the deflection base can rest on the lateral surface of the mother body.
  • designs are feasible, in which the middle section is lifted completely or partially from the lateral surface of the mother body, wherein the central portion may have an un-curved shape in these cases.
  • the nut can be produced in the following steps:
  • a metallic parent body having a plurality of stepped through-holes and on the inside of which at least one thread intended to cooperate with balls and a threaded spindle is provided,
  • a ball sleeve made of metal is attached in each case, - At least one two ball sleeve bridging deflection base is placed on the nut body so that it at least partially engages in the through holes, in each of which a ball sleeve is held,
  • a deflection cover is placed to form a Umlenkkanals, which is preferably made as well as the deflection base made of plastic.
  • the entire assembly which comprises the parent body, the ball sleeves, the deflection base and the deflection cover, is then inserted into a thin-walled outer sleeve in comparison to the parent body.
  • the plug connections which are produced between the ball sleeve sleeves, the deflection base and the deflection cover have, in typical designs of the threaded nut, a lower holding force than the connection between the outer deflection, that is to say the arrangement formed from the deflection base and the deflection cover, and the outer sleeve.
  • At least four ball sleeve sleeves are rigidly connected to the nut base body, one pair of ball sleeve sleeves being connected to exactly one associated deflection base and the plurality of deflection bases being connected to the deflection channels by a single deflection cover bounded radially outward, are covered.
  • the deflection cover which completes two deflection bases or a larger number of deflection bases to form a corresponding number of deflection channels, extends for example over the entire in the axial direction
  • the optional outer sleeve may have a length which corresponds to the length of the mother body.
  • the deflection cover is formed directly by the outer sleeve.
  • the respective bores receiving a ball sleeve in the parent body are preferably stepped, tapering towards the central axis of the parent body, the deflection base - or more precisely, one of the peg-shaped sections of the deflection element.
  • base - at least partially engages only in an outer region of the bore, while an inner, compared to the outer region narrower region of the bore for permanently fixed support of the ball sleeve is provided.
  • the outer, larger diameter portion of the bore is preferably - measured in the longitudinal direction of the bore - shorter than the inner, narrower region of the bore.
  • the bore has a small diameter, only sufficient for receiving and holding the ball sleeve, but not a plastic part, which results in a correspondingly low weakening of the ball nut in its interior, the at least one Thread forming area is synonymous.
  • the small compared to the inner, narrowed portion of the bore bore of the outer, further diameter portion of the bore is sufficient for supporting the peg-shaped portion of the deflection base due to the precise, play-free positioning of the ball sleeve in the bore of the ball nut.
  • the threaded nut can be used for example in a ball screw drive of a brake booster, an electromechanical steering or an electric parking brake. Thanks to the space-saving ball deflection, the threaded nut is generally suitable for applications with limited installation space, even within stationary systems, for example in industrial automation.
  • FIG. 1 is a perspective view of a nut body of a threaded nut for a ball screw
  • FIG. 2 ball sleeve of the threaded nut according to FIG. 1, FIG.
  • FIG. 4 components of the threaded nut in an exploded view.
  • a designated overall by the reference numeral 1 threaded nut is part of a ball screw, not shown, with respect to its basic function is referred to the cited prior art.
  • the mother body 2 is also referred to as a threaded nut in the strict sense or as a ball screw nut.
  • the ball screw nut 2 is a solid metal part.
  • the lateral surface of the ball screw nut 2 designated by 4 is substantially cylindrical.
  • FIG. 2 shows an insulated ball sleeve 5.
  • the ball sleeve 5 is a metal part made of sheet steel.
  • a cylindrical section 6, that is to say the main section, of the ball sleeve 5 is interrupted by a gap 7 running in the longitudinal direction of the ball sleeve 5.
  • At the two end faces of the cylindrical portion 6 close on diametrically opposite sides of the ball sleeve 5 lobes 8, which are aligned in the longitudinal direction of the ball sleeve 5.
  • the two lobes 8 are also referred to as lugs of the ball sleeve 5 and serve in one case the discharge of balls from the thread 3 and in the other case the rotation of the ball sleeve 5 within the outer deflection 9 described in more detail below.
  • the complete outer deflection 9 is located within an outer sleeve 10 designed as a sheet metal part, which surrounds the parent body 2 concentrically.
  • the outer deflection 9 is constructed in several parts, wherein a made of plastic, channel-shaped deflection base 1 1 is placed directly on the lateral surface 4.
  • the entire outer deflection 9 comprises in the exemplary embodiment, two deflection bases 1 1, which are covered by a single deflection cover 12, the Au the specialized tungstenung 9 completed.
  • the measured in the longitudinal direction of the threaded nut 1 and thus the entire ball screw length of the Umlenkungsdeckels 12 corresponds in the embodiment of the length of the ball screw nut 2 and the length of the outer sleeve 10. Deviating from this, other length relations between the Umlenkungsdeckel 12 and the ball screw nut 2 are conceivable.
  • a deflection channel 14 is formed for ball return within the threaded nut 1.
  • the deflection channel 14 In its central region of the deflection channel 14 is curved in the present case in adaptation to the lateral surface 4. Alternatively, a straight design of the central region of the Umlenkkanals 14 is possible.
  • At its two ends of the deflection channel 14 is in each case in a shorter section, which is directed to a bore 13 to.
  • Each bore 13 is a stepped bore, wherein an inner, narrower region of the bore 13 on the inner peripheral surface of the nut body 2, that is in the region of the thread 3, ends, while an outer, expanded portion of the bore 13 in the lateral surface. 4 empties.
  • the region of larger diameter of the bore 13 has a length designated by a.
  • the length of the inner, tapered region of the bore 13 is designated by b.
  • the length a is less than the length b.
  • the lengths designated by a, b are to be measured in the longitudinal direction of the bore 13 and thus of the ball sleeve sleeve 5.
  • the diameter of the bore 13 in its inner, tapered portion is dimensioned such that the ball sleeve 5 is fixable therein.
  • the outwardly directed tab 8 of the ball sleeve sleeve 5 protrudes from the tapered portion of the bore 13, wherein it acts in cooperation with the deflection base 1 1 as anti-rotation.
  • the deflection base 1 1 engages partially with its pin-shaped portions in the portion of the bore 13 with an enlarged diameter and contacted with this section, the ball sleeve 5.
  • the deflection base 1 1 is only then placed on the mother body 2, if the ball sleeve sleeves 5 are already fixed permanently and in a precisely defined position in the mother body 2.
  • the rigid connection between the mother body 2 and the ball sleeve 5 remains even during operation of the ball screw.
  • the links between the diversions kungsbasen 1 1 and the ball sleeve sleeves 5 are designed in the embodiment as connectors. The same applies to the connection between the deflection base 11 and the deflection cover 12.
  • the overall small dimensioned, only a part of their length step-like widened holes 13 allow a small radial distance between the thread 3 and the mecanicumlenk- 9 and so that a total of compact and robust construction of the threaded nut 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)

Abstract

L'invention concerne un écrou fileté destiné à une vis d'entraînement à billes, qui comprend un corps de base d'écrou (2) pourvu d'un filetage (3), ainsi qu'une déflection extérieure (9) en plusieurs parties destinée à ramener des billes dans le filetage (13) par le biais d'un conduit de déflexion (14). Un manchon de guidage de bille (5) inséré dans un alésage (13) du corps de base d'écrou (2) est relié de manière fixe au corps de base d'écrou (2) au niveau de chaque transition entre le filetage (3) et le conduit de déviation (14) et, en plus du manchon de guidage à billes (5), une base de déviation (11) délimitant le conduit de déviation (14) radialement vers l'intérieur s'engage au moins partiellement dans l'alésage (13).
PCT/DE2018/100549 2017-07-19 2018-06-11 Écrou fileté pour une vis d'entraînement à billes WO2019015710A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017116255.0A DE102017116255A1 (de) 2017-07-19 2017-07-19 Gewindemutter für einen Kugelgewindetrieb
DE102017116255.0 2017-07-19

Publications (1)

Publication Number Publication Date
WO2019015710A1 true WO2019015710A1 (fr) 2019-01-24

Family

ID=62778662

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2018/100549 WO2019015710A1 (fr) 2017-07-19 2018-06-11 Écrou fileté pour une vis d'entraînement à billes

Country Status (2)

Country Link
DE (1) DE102017116255A1 (fr)
WO (1) WO2019015710A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4283163A1 (fr) * 2022-05-24 2023-11-29 SFS Group International AG Vis d'entraînement à billes
DE102022114069A1 (de) 2022-06-03 2023-12-14 Schaeffler Technologies AG & Co. KG Aktuator und Verfahren zur Herstellung einer Spindelmutter

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7314698U (de) 1972-04-17 1978-03-16 Skf Kugellagerfabriken Gmbh, 8720 Schweinfurt Kugelschraubgetriebe
DE3635212A1 (de) * 1986-10-16 1988-04-28 Kammerer Gmbh Gewindetechnik Kugelgewindespindel
US5373755A (en) * 1993-07-30 1994-12-20 Dana Corporation Skirt deflector for a ball nut and screw device
EP0985851A1 (fr) 1998-03-25 2000-03-15 Thk Co., Ltd. Dispositif a circulation a billes
JP2002098212A (ja) * 2000-07-18 2002-04-05 Thk Co Ltd ボールねじ装置
EP1830106A1 (fr) 2004-12-22 2007-09-05 NSK Ltd., Dispositif de vis à billes
DE102009009851A1 (de) 2009-02-20 2010-08-26 Schaeffler Technologies Gmbh & Co. Kg Kugelmutter für einen Kugelgewindetrieb
US20130139629A1 (en) * 2010-09-06 2013-06-06 Thk Co., Ltd. Rolling element screw assembly
DE102012213856A1 (de) 2012-05-10 2013-11-14 Schaeffler Technologies AG & Co. KG Kugelgewindetrieb mit Schrägbohrung

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7314698U (de) 1972-04-17 1978-03-16 Skf Kugellagerfabriken Gmbh, 8720 Schweinfurt Kugelschraubgetriebe
DE3635212A1 (de) * 1986-10-16 1988-04-28 Kammerer Gmbh Gewindetechnik Kugelgewindespindel
US5373755A (en) * 1993-07-30 1994-12-20 Dana Corporation Skirt deflector for a ball nut and screw device
EP0985851A1 (fr) 1998-03-25 2000-03-15 Thk Co., Ltd. Dispositif a circulation a billes
JP2002098212A (ja) * 2000-07-18 2002-04-05 Thk Co Ltd ボールねじ装置
EP1830106A1 (fr) 2004-12-22 2007-09-05 NSK Ltd., Dispositif de vis à billes
DE102009009851A1 (de) 2009-02-20 2010-08-26 Schaeffler Technologies Gmbh & Co. Kg Kugelmutter für einen Kugelgewindetrieb
US20130139629A1 (en) * 2010-09-06 2013-06-06 Thk Co., Ltd. Rolling element screw assembly
DE102012213856A1 (de) 2012-05-10 2013-11-14 Schaeffler Technologies AG & Co. KG Kugelgewindetrieb mit Schrägbohrung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4283163A1 (fr) * 2022-05-24 2023-11-29 SFS Group International AG Vis d'entraînement à billes
DE102022114069A1 (de) 2022-06-03 2023-12-14 Schaeffler Technologies AG & Co. KG Aktuator und Verfahren zur Herstellung einer Spindelmutter

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Publication number Publication date
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