US20050061099A1 - Ball-nut assembly and method for making - Google Patents
Ball-nut assembly and method for making Download PDFInfo
- Publication number
- US20050061099A1 US20050061099A1 US10/982,126 US98212604A US2005061099A1 US 20050061099 A1 US20050061099 A1 US 20050061099A1 US 98212604 A US98212604 A US 98212604A US 2005061099 A1 US2005061099 A1 US 2005061099A1
- Authority
- US
- United States
- Prior art keywords
- ball
- crossover
- nut
- ball nut
- flange
- 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
Links
Images
Classifications
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- 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
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- 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
- F16H2025/2481—Special features for facilitating the manufacturing of spindles, nuts, or sleeves of screw devices
-
- 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
-
- 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
- Y10T74/19753—Plural independent recirculating element paths
-
- 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
-
- 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
Abstract
A ball-nut assembly includes a ball nut and a crossover member. The ball nut incudes a radial through slot and an outer surface. The outer surface has a first portion, has a ledge radially recessed from the first portion and at least partially bounding the through slot, and has an undercut wall connecting the ledge and the first portion. The crossover member has a flange and a crossover-grooved portion. A method for making a ball-nut assembly positions the crossover member from outside the ball nut to have the flange supported by the ledge and the crossover-grooved portion located in the through slot. The method also deforms the flange creating a staked portion of the flange which contacts the undercut wall of the outer surface of the ball nut.
Description
- The present invention relates generally to ball screws and ball nuts, and more particularly to a ball-nut assembly having a crossover member and to a method for making a ball-nut assembly having a crossover member.
- Conventional automotive braking systems include those which use a ball-screw-and-ball-nut assembly, wherein the brake booster serves as a housing, wherein the ball screw is turned by a gear driven by an electric brake caliper motor, wherein the ball nut is connected to the brake pad, and wherein rotation of the ball screw axially moves the ball nut. In some known ball-nut assemblies, an exterior tube extending above the ball nut serves as a crossover for the balls, as is known to the artisan. However, such exterior tubes demand close part tolerances which are expensive and difficult to achieve. Also, such protruding exterior tubes are not suitable for certain applications such as being housed in a brake caliper housing. In other known ball-nut assemblies, an internal crossover member is used which is inserted into a radial through slot of the ball nut from inside the ball nut, which abuts a radially-inward-facing ledge of the ball nut surrounding the through slot, and which floats while being captured between the ball screw and the ball nut as is known to the artisan. Such internal crossovers are suitable for many applications including being housed in an automotive brake booster. However, such internal crossovers demand close part tolerances which are expensive and difficult to achieve. If close tolerances are not achieved, the ball screw and ball nut assembly will not work as is known to the artisan.
- What is needed is a ball-nut assembly, and a method for making a ball nut assembly, which uses an internal crossover member but which does not require close part tolerances to ensure proper operation of a ball-screw-and-ball-nut assembly.
- A first expression of a first embodiment of the invention is for a ball-nut assembly including a ball nut and a crossover member. The ball nut includes a radial through slot and includes an outer surface having a first portion, having a ledge radially recessed from the first portion and at least partially bounding the through slot, and having an undercut wall connecting the ledge and the first portion. The crossover member has a flange supported by the ledge and has a crossover-grooved portion positioned in the through slot, wherein the flange has at least one deformed portion contacting the undercut wall of the outer surface of the ball nut.
- A second expression of a first embodiment of the invention is for a ball-screw-and-ball-nut assembly including a ball nut, a crossover member, a ball screw and balls. The ball nut includes an inside helical groove, includes a radial through slot, and includes an outer surface having a first portion, having a ledge radially recessed from the first portion and at least partially bounding the through slot, and having an undercut wall connecting the ledge and the first portion. The crossover member has a flange supported by the ledge and has a crossover-grooved portion positioned in the through slot, wherein the flange has at least one deformed portion contacting the undercut wall of the outer surface of the ball nut. The ball screw includes an outside helical groove and is positioned inside the ball nut. The balls contact the crossover-grooved portion of the crossover member and a portion of the inside and outside helical grooves.
- A first method of the invention is for making a ball-nut assembly and includes steps a) through d). Step a) includes obtaining a ball nut including a radial through slot and including an outer surface having a first portion, having a ledge radially recessed from the first portion and at least partially bounding the through slot, and having an undercut wall connecting the ledge and the first portion. Step b) includes obtaining a crossover member having a flange and a crossover-grooved portion. Step c) includes positioning the crossover member from outside the ball nut to have the flange supported by the ledge and the crossover-grooved portion disposed in the through slot. Step d) includes deforming the flange creating a staked portion of the flange which contacts the undercut wall of the outer surface of the ball nut. In one example, the first method also includes after step a) and before step c) the step on aligning the ball nut on a locating arbor which simulates balls placed around a ball screw and wherein step c) includes aligning the crossover member on the locating arbor and step d) includes using a stake punch.
- Several benefits and advantages are derived from one or more of the first method and the first and second expressions of a first embodiment of the invention. The example which includes the locating arbor, which simulates balls placed around a ball screw for proper alignment of the crossover member on the ball nut, enables close assembly tolerances for inexpensive components that can be manufactured with loose part tolerances, as can be appreciated by those skilled in the art. Once properly aligned, the example which includes the stake punch deforms and stakes the crossover member to the undercut wall of the ball nut to maintain the crossover member in proper aligned attachment to the ball nut for smooth operation of a ball-screw-and-ball-nut assembly.
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FIG. 1 is a top planar view of a first embodiment of a ball-nut assembly (including a crossover member) and of a ball-screw-and-ball-nut assembly of the invention; -
FIG. 2 is cross-sectional view of the ball-nut assembly and the ball-screw-and-ball-nut assembly ofFIG. 1 taken along lines 2-2 ofFIG. 1 ; -
FIG. 3 is a view, as inFIG. 2 , but of only the ball nut and with the crossover member of the ball-nut assembly removed; -
FIG. 4 is a view, as inFIG. 1 , but of only the ball nut and with the crossover member of the ball-nut assembly removed; -
FIG. 5 is an enlarged, top planar view of the crossover member ofFIGS. 1 and 2 ; -
FIG. 6 is a side elevational view of the crossover member ofFIG. 5 taken along lines 6-6 ofFIG. 5 ; -
FIG. 7 is a bottom planar view of the crossover member ofFIG. 6 taken along lines 7-7 ofFIG. 6 ; -
FIG. 8 is a block diagram of a first method of making a ball-nut assembly; and -
FIG. 9 is a perspective view of a first embodiment of apparatus used in the method ofFIG. 8 and of a ball nut (with portions cutaway) and a crossover member both aligned on the locating arbor of the apparatus. - Referring now to the drawings,
FIGS. 1-7 illustrate a first embodiment of the present invention. A first expression of the first embodiment shown inFIGS. 1-7 is for a ball-nut assembly 10 including aball nut 12 and acrossover member 14. Theball nut 12 includes a radial throughslot 16 and includes anouter surface 18. Theouter surface 18 has afirst portion 20, has aledge 22 radially recessed from thefirst portion 20 and at least partially bounding the throughslot 16, and has anundercut wall 24 connecting theledge 22 and thefirst portion 20. By “undercut wall 24” is meant that theundercut wall 24 tilts inward toward the throughslot 16 as one moves along theundercut wall 24 from theledge 22 to thefirst portion 20 as best seen inFIG. 3 . Thecrossover member 14 has aflange 26 supported by theledge 22 and has a crossover-groovedportion 28 disposed in the throughslot 16, wherein theflange 26 has at least one deformedportion undercut wall 24 of theouter surface 18 of theball nut 12. In one arrangement, the contact of the at-least-one deformedportion undercut wall 24 is a staked contact. - In one example of the first expression, the
ledge 22 has an annular shape, surrounds the throughslot 16, and annularly supports theflange 26. In one modification, theundercut wall 24 has axially-opposing first andsecond end portions portion portions second end portions undercut wall 24. In one construction, thefirst portion 20 has a cylindrical shape. In one variation, thecrossover member 14 has a flat outward facingsurface 38 disposed below thefirst portion 20 of theouter surface 18 of theball nut 12 which allows the use of an inwardly-protruding pin (not shown) from a surrounding housing (such as an electric brake caliper housing, not shown) to sideways engage the undercut wall 24 (above the crossover member 14) preventing rotation of theball nut 12 when such rotation is not desired. In one application, theball nut 12 is a vehicle-brake-pad-driving ball nut. - In the same or different example of the first expression, the
ball nut 12 is essentially non-ductile, and thecrossover member 14 has an elongation ductility of at least four percent. In one construction, thecrossover member 14 consists essentially of aluminum, and theball nut 12 consists essentially of steel. In one implementation, thecrossover member 14 is a net shape component meaning that it is a molded (such as, but not limited to, using powdered metallurgy techniques), die-cast, or stamped component. In one application, the tolerances for making thecrossover member 14 are substantially twenty thousandths of an inch. In one modification, theundercut wall 24 makes an angle of substantially five to ten degrees (and in one variation substantially seven degrees) from vertical. In one design, the crossover-groovedportion 28 of thecrossover member 14 has threecrossover grooves 40. - A second expression of the first embodiment shown in
FIGS. 1-7 is for a ball-screw-and-ball-nut assembly 42 including aball nut 12, acrossover member 14, aball screw 44, and a plurality ofballs 46. Theball nut 12 includes an insidehelical groove 48, includes a radial throughslot 16, and includes anouter surface 18. Theouter surface 18 has afirst portion 20, has aledge 22 radially recessed from thefirst portion 20 and at least partially bounding the throughslot 16, and has anundercut wall 24 connecting theledge 22 and thefirst portion 20. Thecrossover member 14 has aflange 26 supported by theledge 22 and has a crossover-groovedportion 28 disposed in the throughslot 16, wherein theflange 26 has at least one deformedportion undercut wall 24 of theouter surface 18 of theball nut 12. Theball screw 44 includes an outsidehelical groove 50 and is disposed inside theball nut 12. Theballs 46 contact the crossover-groovedportion 28 of thecrossover member 14 and a portion of the inside and outsidehelical grooves balls 46 are always axially bounded by the crossover-groovedportion 28 of thecrossover member 14, as is understood by the artisan. - In one application, the
ball screw 44 is an electric-motor-driven ball screw, and theball nut 12 is a vehicle-brake-pad-driving ball nut. The entire previous multi-paragraph discussion of the first expression of the ball-nut assembly 10 is equally applicable to the second expression of the ball-screw-and-ball-nut assembly 42. - A first method of the invention is for making a ball-
nut assembly 10 and is shown inFIG. 8 . The first method includes steps a) through d). Step a) is labeled inblock 52 ofFIG. 8 as “Obtain A Ball Nut”. Step a) includes obtaining aball nut 12 including a radial throughslot 16 and including anouter surface 18 having afirst portion 20, having aledge 22 radially recessed from thefirst portion 20 and at least partially bounding the throughslot 16, and having an undercutwall 24 connecting theledge 22 and thefirst portion 20. Step b) is labeled inblock 54 ofFIG. 8 as “Obtain A Crossover Member”. Step b) includes obtaining acrossover member 14 having aflange 26 and a crossover-groovedportion 28. Step c) is labeled inblock 56 ofFIG. 8 as “Dispose Crossover Member In Slot Of Ball Nut”. Step c) includes disposing thecrossover member 14 from outside theball nut 12 to have theflange 26 supported by theledge 22 and the crossover-groovedportion 28 disposed in the throughslot 16. Step d) is labeled inblock 58 ofFIG. 8 as “Deform Flange Of Crossover Member”. Step d) includes deforming theflange 26 creating a staked portion (e.g., the at-least-onedeformed portion 30 and 32) of theflange 26 which contacts the undercutwall 24 of theouter surface 18 of theball nut 12. It is noted that, in this method, the contact of the at-least-onedeformed portion wall 24 is a staked contact. - In one example, the first method also includes after step a) and before step c) the step of aligning the
ball nut 12 on a locating arbor 60 (seen inFIG. 9 ) which simulates balls placed around a ball screw. In one variation, the locatingarbor 60 has locatingwires 62 soldered into the outside helical groove of a ball-screw-shaped portion of the locatingarbor 60 which simulate balls placed around a ball screw. In one modification, the locatingwires 62 define only partial arcs so that theball nut 12 can be axially positioned over the locating wires 62 (without having to be threaded onto them) and then aligned by having the insidehelical groove 48 of theball nut 12 engage the locatingwires 62. In one application, step c) includes aligning thecrossover member 14 on the locatingarbor 60. When using the locatingwires 62, alignment of thecrossover member 14 is accomplished by engaging thecrossover grooves 40 with the locatingwires 62. In one arrangement, the first method also includes between steps c) and d) the step of checking the radial position of thecrossover member 14 with aposition indicator 64. In the same or different arrangement, the first method also includes between steps c) and d) the step of clamping thecrossover member 14 against the locatingarbor 60 such as with a spring-loaded clamp 66. In one construction, step d) includes using a stake punch (twostake punches 68 are shown inFIG. 9 ). It is noted that thestake punch 68 will leave indentations on the outward-facingsurface 38 of thecrossover member 14 and that such indentations have been omitted from the figures for clarity. The locating arbor 60 (including the locating wires 62), theposition indicator 64, the clamp 66, and thestake punch 68 are components of apparatus 70 for making the ball-nut assembly 10. - Several benefits and advantages are derived from one or more of the first method and the first and second expressions of a first embodiment of the invention. The example which includes the locating arbor, which simulates balls placed around a ball screw for proper alignment of the crossover member on the ball nut, enables close assembly tolerances for inexpensive components that can be manufactured with loose part tolerances, as can be appreciated by those skilled in the art. Once properly aligned, the example which includes the stake punch deforms and stakes the crossover member to the undercut wall of the ball nut to maintain the crossover member in proper aligned attachment to the ball nut for smooth operation of a ball-screw-and-ball-nut assembly.
- The foregoing description of a method and several expressions of an embodiment of the invention has been presented for purposes of illustration. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. It is intended that the scope of the invention be defined by the claims appended hereto.
Claims (5)
1. A method for making a ball-nut assembly comprising the steps of:
a) obtaining a ball nut including a radial through slot and including an outer surface having a first portion, having a ledge radially recessed from the first portion and at least partially bounding the through slot, and having an undercut wall connecting the ledge and the first portion;
b) obtaining a crossover member having a flange and a crossover-grooved portion;
c) disposing the crossover member from outside the ball nut to have the flange supported by the ledge and the crossover-grooved portion disposed in the through slot;
d) checking the radial position of the crossover member with a position indicator;
e) utilizing a stake punch to deform the flange so as to create a staked portion of the flange which contacts the undercut wall of the outer surface of the ball nut; and
f) after step a) and before step c), aligning the ball nut on a locating arbor which simulates balls placed around a ball screw.
2. The method of claim 1 , wherein step c) includes aligning the crossover member on the locating arbor.
3. (Cancelled).
4. The method of claim a 1, also including between steps c) and e) the step of clamping the crossover member against the locating arbor.
5. (Cancelled).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/982,126 US20050061099A1 (en) | 2001-11-15 | 2004-11-05 | Ball-nut assembly and method for making |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/001,715 US6813970B2 (en) | 2001-11-15 | 2001-11-15 | Ball-nut assembly and method for making |
US10/982,126 US20050061099A1 (en) | 2001-11-15 | 2004-11-05 | Ball-nut assembly and method for making |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/001,715 Continuation US6813970B2 (en) | 2001-11-15 | 2001-11-15 | Ball-nut assembly and method for making |
Publications (1)
Publication Number | Publication Date |
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US20050061099A1 true US20050061099A1 (en) | 2005-03-24 |
Family
ID=21697458
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/001,715 Expired - Lifetime US6813970B2 (en) | 2001-11-15 | 2001-11-15 | Ball-nut assembly and method for making |
US10/982,126 Abandoned US20050061099A1 (en) | 2001-11-15 | 2004-11-05 | Ball-nut assembly and method for making |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/001,715 Expired - Lifetime US6813970B2 (en) | 2001-11-15 | 2001-11-15 | Ball-nut assembly and method for making |
Country Status (3)
Country | Link |
---|---|
US (2) | US6813970B2 (en) |
EP (1) | EP1312831B1 (en) |
DE (1) | DE60233193D1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070029142A1 (en) * | 2005-08-03 | 2007-02-08 | Drennen David B | Brake system including ball screw and nut assembly |
CN109676356A (en) * | 2018-12-27 | 2019-04-26 | 天津航天长征技术装备有限公司 | A kind of portable ball-screw assembling device |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6813970B2 (en) * | 2001-11-15 | 2004-11-09 | Delphi Technologies, Inc. | Ball-nut assembly and method for making |
US7267616B2 (en) | 2004-08-27 | 2007-09-11 | Delphi Technologies, Inc. | Method for making a ball-nut and method for making a ball-screw |
US7677126B2 (en) * | 2005-03-22 | 2010-03-16 | Gm Global Technology Operations, Inc. | Ball screw mechanism |
US7487692B2 (en) * | 2006-04-13 | 2009-02-10 | Hiwin Technologies Corp. | Guiding device for ball nut |
JP5255503B2 (en) * | 2009-03-31 | 2013-08-07 | Thk株式会社 | Rolling element screw device |
US8402852B2 (en) * | 2011-01-18 | 2013-03-26 | Goodrich Corporation | Ballscrew assembly |
EP2514999B1 (en) * | 2011-04-19 | 2017-01-25 | Aktiebolaget SKF | Ball screw assembly with one-piece deflecting elements |
JP6805752B2 (en) * | 2016-11-25 | 2020-12-23 | 株式会社ジェイテクト | A ball screw device and a steering device equipped with a ball screw device |
US10106139B2 (en) | 2017-02-02 | 2018-10-23 | Goodrich Corporation | Brake systems and methods |
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2001
- 2001-11-15 US US10/001,715 patent/US6813970B2/en not_active Expired - Lifetime
-
2002
- 2002-10-21 DE DE60233193T patent/DE60233193D1/en not_active Expired - Lifetime
- 2002-10-21 EP EP02079376A patent/EP1312831B1/en not_active Expired - Fee Related
-
2004
- 2004-11-05 US US10/982,126 patent/US20050061099A1/en not_active Abandoned
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US3290077A (en) * | 1964-07-15 | 1966-12-06 | Aluminum Co Of America | Joining and jointed structures |
US5005436A (en) * | 1988-02-11 | 1991-04-09 | R.G.B. S.P.A. | Recirculating ball screw-nut screw coupling |
US5375323A (en) * | 1991-10-30 | 1994-12-27 | Nsk Ltd. | Method for securing shaft of cam follower device for valve action mechanism |
US5482312A (en) * | 1992-05-18 | 1996-01-09 | Trw Vehicle Safety Systems Inc. | Inflator for a vehicle air bag assembly and a method of making the same |
US6112610A (en) * | 1997-08-05 | 2000-09-05 | Thomson Saginaw Ball Screw Company, Llc | Externally insertable self-retaining crossover for ball nut and screw assemblies |
US5937700A (en) * | 1998-05-12 | 1999-08-17 | Thomson Saginaw Ball Screw Company, L.L.C. | Externally installable ball return crossover systems for ball nut and screw assemblies and methods of constructing and installing them |
US6454042B1 (en) * | 1999-11-04 | 2002-09-24 | Ntn Corporation | Ball screw and electrically powered steering device having the ball screw |
US6439338B2 (en) * | 2000-04-03 | 2002-08-27 | Ntn Corporation | Ball screw mechanism and electrically powered steering device utilizing the same |
US6813970B2 (en) * | 2001-11-15 | 2004-11-09 | Delphi Technologies, Inc. | Ball-nut assembly and method for making |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070029142A1 (en) * | 2005-08-03 | 2007-02-08 | Drennen David B | Brake system including ball screw and nut assembly |
CN109676356A (en) * | 2018-12-27 | 2019-04-26 | 天津航天长征技术装备有限公司 | A kind of portable ball-screw assembling device |
Also Published As
Publication number | Publication date |
---|---|
EP1312831A2 (en) | 2003-05-21 |
EP1312831B1 (en) | 2009-08-05 |
US6813970B2 (en) | 2004-11-09 |
DE60233193D1 (en) | 2009-09-17 |
US20030089188A1 (en) | 2003-05-15 |
EP1312831A3 (en) | 2006-04-19 |
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