[go: up one dir, main page]

US20010020400A1 - Ballscrew - Google Patents

Ballscrew Download PDF

Info

Publication number
US20010020400A1
US20010020400A1 US09/798,473 US79847301A US2001020400A1 US 20010020400 A1 US20010020400 A1 US 20010020400A1 US 79847301 A US79847301 A US 79847301A US 2001020400 A1 US2001020400 A1 US 2001020400A1
Authority
US
United States
Prior art keywords
ballscrew
screwshaft
circulation path
groove
deflectors
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
US09/798,473
Inventor
Dennis Walton
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.)
Thomson Saginaw Ball Screw Co LLC
Original Assignee
Thomson Saginaw Ball Screw Co LLC
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 Thomson Saginaw Ball Screw Co LLC filed Critical Thomson Saginaw Ball Screw Co LLC
Assigned to THOMSON SAGINAW BALI SCREW COMPANY, LLC reassignment THOMSON SAGINAW BALI SCREW COMPANY, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WALTON, DENNIS FREDERICK
Publication of US20010020400A1 publication Critical patent/US20010020400A1/en
Priority to US10/383,801 priority Critical patent/US6898994B2/en
Abandoned legal-status Critical Current

Links

Images

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
    • 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
    • F16H25/2228—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 the device for circulation forming a part of the screw member
    • 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
    • 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
    • Y10T74/19763—Roller return path in shaft
    • 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 ballscrew.
  • the present invention seeks to provide a remedy.
  • the present invention is directed to a ballscrew having a ball re-circulation path within the screwshaft of the ballscrew.
  • At least a part of the ball re-circulation path is provided by an insert inserted into the screwshaft.
  • an insert which is concentric with the screwshaft.
  • Deflectors to direct the balls of the ballscrew into the re-circulation path may be in the form of generally circular or part-circular elongate members which engage the screwshaft. These deflectors may take the general form of circlips.
  • FIG. 1 shows an axial section through such a ballscrew
  • FIG. 2 shows two half cross-sectional views of a screwshaft of a ballscrew shown in FIG. 1;
  • FIG. 3 shows a side view of a screwshaft of the ballscrew shown in FIG. 1;
  • FIG. 4 shows two half cross-sectional views of a screwshaft of a ballscrew shown in FIG. 1 with deflectors;
  • FIG. 5 a side view of a screwshaft of the ballscrew shown in FIG. 1 with deflectors
  • FIG. 6 shows a deflector of the screwshaft shown in FIG. 1, viewing it along a line which passes through the centre of the deflector in a direction generally perpendicular thereto;
  • FIG. 7 shows a generally sectional view through an insert located in the screwshaft of the ballscrew shown in FIG. 1;
  • FIG. 8 shows a side view of the insert shown in FIG. 7.
  • FIGS. 1 to 8 there is shown a ballscrew 10 having a screwshaft 12 surrounded by a ballnut 14 so that the screwshaft 12 and the ballnut 14 are concentric with one another, sharing a common axis 16 of the ballscrew 10 .
  • a helical groove 20 Around an outer cylindrical surface 18 of the screwshaft 12 , there is provided a helical groove 20 . This is in registration with a helical groove 22 formed around the inner cylindrical surface of the ballnut 14 such that the grooves 20 and 22 together define a helical track for balls 24 of the ballscrew 10 .
  • Two bores 26 are formed towards the two ends of the groove 20 of the screwshaft 12 , these bores 26 slanting inwardly from the groove 20 to the screwshaft interior.
  • Deflectors 28 are in the form of circlips and can be rotated or snap-fitted into the groove 20 of the screwshaft 12 .
  • One end of each circlip 28 has a surface which is on a slant relative to the groove 20 and which is generally flush with an interior surface of the associated bore 26 .
  • An insert 30 of plastics material is inserted into the screwshaft 12 so as to be coaxial therewith and is formed with a re-circulation path 32 to transfer balls 24 from one end of the groove 20 to the other end thereof via the screwshaft interior.
  • the length of the groove 20 around the outside of the screwshaft 12 is substantially shorter than the length of the groove 22 formed around the inside of the ballnut 14 .

Landscapes

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

Abstract

A ballscrew having a ball re-circulation path within the screwshaft of the ballscrew.

Description

  • The present invention relates to a ballscrew. [0001]
  • Hitherto, ballscrews have been provided with a ball re-circulation path within the ballnut of the ballscrew. The disadvantage of this construction is that the screwshaft needs to be long relative to the ballnut. [0002]
  • The present invention seeks to provide a remedy. [0003]
  • Accordingly, the present invention is directed to a ballscrew having a ball re-circulation path within the screwshaft of the ballscrew. [0004]
  • Preferably, at least a part of the ball re-circulation path is provided by an insert inserted into the screwshaft. In this case, it is advantageous to have an insert which is concentric with the screwshaft. [0005]
  • Deflectors to direct the balls of the ballscrew into the re-circulation path may be in the form of generally circular or part-circular elongate members which engage the screwshaft. These deflectors may take the general form of circlips.[0006]
  • An example of a ballscrew made in accordance with the present invention is shown in the accompanying drawings, in which: [0007]
  • FIG. 1 shows an axial section through such a ballscrew; [0008]
  • FIG. 2 shows two half cross-sectional views of a screwshaft of a ballscrew shown in FIG. 1; [0009]
  • FIG. 3 shows a side view of a screwshaft of the ballscrew shown in FIG. 1; [0010]
  • FIG. 4 shows two half cross-sectional views of a screwshaft of a ballscrew shown in FIG. 1 with deflectors; [0011]
  • FIG. 5 a side view of a screwshaft of the ballscrew shown in FIG. 1 with deflectors; [0012]
  • FIG. 6 shows a deflector of the screwshaft shown in FIG. 1, viewing it along a line which passes through the centre of the deflector in a direction generally perpendicular thereto; [0013]
  • FIG. 7 shows a generally sectional view through an insert located in the screwshaft of the ballscrew shown in FIG. 1; and [0014]
  • FIG. 8 shows a side view of the insert shown in FIG. 7.[0015]
  • In FIGS. [0016] 1 to 8, there is shown a ballscrew 10 having a screwshaft 12 surrounded by a ballnut 14 so that the screwshaft 12 and the ballnut 14 are concentric with one another, sharing a common axis 16 of the ballscrew 10. Around an outer cylindrical surface 18 of the screwshaft 12, there is provided a helical groove 20. This is in registration with a helical groove 22 formed around the inner cylindrical surface of the ballnut 14 such that the grooves 20 and 22 together define a helical track for balls 24 of the ballscrew 10. Two bores 26 are formed towards the two ends of the groove 20 of the screwshaft 12, these bores 26 slanting inwardly from the groove 20 to the screwshaft interior. Deflectors 28 (shown in FIGS. 4, 5 and 6) are in the form of circlips and can be rotated or snap-fitted into the groove 20 of the screwshaft 12. One end of each circlip 28 has a surface which is on a slant relative to the groove 20 and which is generally flush with an interior surface of the associated bore 26.
  • An [0017] insert 30 of plastics material is inserted into the screwshaft 12 so as to be coaxial therewith and is formed with a re-circulation path 32 to transfer balls 24 from one end of the groove 20 to the other end thereof via the screwshaft interior.
  • It will be noted that the length of the [0018] groove 20 around the outside of the screwshaft 12 is substantially shorter than the length of the groove 22 formed around the inside of the ballnut 14.
  • Modifications in the illustrated construction may occur to the reader without taking the resulting construction outside the scope of the present invention. For example, instead of circlip-type deflectors, there may be provided small hood-like protuberances extending from the [0019] groove 20 of the screwshaft 12 at the positions of the bores 26.

Claims (5)

I claim:
1. A ballscrew having a ball re-circulation path within the screwshaft of the ballscrew.
2. A ballscrew according to
claim 1
, wherein at least a part of the ball re-circulation path is provided by an insert inserted into the screwshaft.
3. A ballscrew according to
claim 2
, wherein the said insert is concentric with the screwshaft.
4. A ballscrew according to
claim 1
 having deflectors to direct the balls of the ballscrew into the re-circulation path, which are in the form of generally circular or part-circular elongate members which engage the screwshaft.
5. A ballscrew according to
claim 4
, wherein the deflectors take the general form of circlips.
US09/798,473 2000-03-03 2001-03-02 Ballscrew Abandoned US20010020400A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10/383,801 US6898994B2 (en) 2000-03-03 2003-03-07 Ball nut and screw assembly

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0005122A GB2359868A (en) 2000-03-03 2000-03-03 Ballscrew having a ball re-circulation path within the screw shaft
GB0005122.7 2000-03-03

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US10/383,801 Continuation US6898994B2 (en) 2000-03-03 2003-03-07 Ball nut and screw assembly

Publications (1)

Publication Number Publication Date
US20010020400A1 true US20010020400A1 (en) 2001-09-13

Family

ID=9886877

Family Applications (2)

Application Number Title Priority Date Filing Date
US09/798,473 Abandoned US20010020400A1 (en) 2000-03-03 2001-03-02 Ballscrew
US10/383,801 Expired - Lifetime US6898994B2 (en) 2000-03-03 2003-03-07 Ball nut and screw assembly

Family Applications After (1)

Application Number Title Priority Date Filing Date
US10/383,801 Expired - Lifetime US6898994B2 (en) 2000-03-03 2003-03-07 Ball nut and screw assembly

Country Status (2)

Country Link
US (2) US20010020400A1 (en)
GB (1) GB2359868A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120011951A1 (en) * 2008-11-25 2012-01-19 Precilec Linear actuator
CN103233700A (en) * 2013-04-16 2013-08-07 江苏威尔德钻采设备有限公司 Ball screw gate valve
US11041553B2 (en) * 2019-05-14 2021-06-22 Ametek, Inc. Everted ball screw drive
US11098790B2 (en) 2019-05-14 2021-08-24 Ametek, Inc. Linear actuator with everted ball screw drive

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050247529A1 (en) * 2004-05-07 2005-11-10 Gaines Louie T Aircraft brake acuation system including an internally threaded ballscrew actuator assembly
US7980973B1 (en) 2006-05-01 2011-07-19 Purdue Research Foundation Coaxial electrical actuator for continuously variable transmissions
DE102006027942A1 (en) * 2006-06-17 2007-12-20 Schaeffler Kg Ball screw, has spindle nut arranged on threaded spindle provided with recess for accommodating insert and return section formed as groove at inserts, and ball channel comprising load-section
US7675253B2 (en) * 2006-11-15 2010-03-09 Schlumberger Technology Corporation Linear actuator using magnetostrictive power element
US8235109B2 (en) * 2008-09-26 2012-08-07 Schlumberger Technology Corporatio Instrument centralizer configurable for use with cement evaluation well logging instruments

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1049179A (en) * 1964-11-04 1966-11-23 British Aircraft Corp Ltd Improvements in recirculating ball screw-and-nut assemblies and linear actuators incorporating such assemblies
FR2230238A5 (en) * 1973-05-16 1974-12-13 Tech Integrale
FR2249577A5 (en) 1973-10-30 1975-05-23 Tech Integrale
DE2741333C3 (en) * 1977-09-14 1980-11-27 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Screw for a recirculating ball screw drive
DE2941565C2 (en) * 1979-10-13 1982-03-18 Helmut 5600 Wuppertal Korthaus Ball screw
US5899114A (en) * 1997-08-14 1999-05-04 Thomson Saginaw Ball Screw Company, L.L.C. Differential ball screw and nut assembly and method of obtaining relative linear motion differentially
GB9814164D0 (en) * 1998-06-30 1998-08-26 Thomson Ibl Company Ballscrew
DE19857581A1 (en) * 1998-12-14 2000-06-15 Schaeffler Waelzlager Ohg Ball screw drive unit for limited travel applications has return passage in spindle, dispensing with radial extension of the ball return channel
US20040093973A1 (en) * 2000-10-23 2004-05-20 Georg Halasy-Wimmer Ball screw

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120011951A1 (en) * 2008-11-25 2012-01-19 Precilec Linear actuator
CN103233700A (en) * 2013-04-16 2013-08-07 江苏威尔德钻采设备有限公司 Ball screw gate valve
US11041553B2 (en) * 2019-05-14 2021-06-22 Ametek, Inc. Everted ball screw drive
US11098790B2 (en) 2019-05-14 2021-08-24 Ametek, Inc. Linear actuator with everted ball screw drive

Also Published As

Publication number Publication date
US6898994B2 (en) 2005-05-31
GB0005122D0 (en) 2000-04-26
US20030145673A1 (en) 2003-08-07
GB2359868A (en) 2001-09-05

Similar Documents

Publication Publication Date Title
US20130199324A1 (en) Ball screw assembly
US20010020400A1 (en) Ballscrew
US6668672B2 (en) Ball screw nut
US6481305B2 (en) Roller screw and roller screw roller arranging method
US7992461B2 (en) Circulating device for motion guide apparatus
EP3096041B1 (en) Ball screw assembly with one-piece deflecting elements
US6675669B2 (en) Ball screw apparatus
EP2515000B1 (en) Ball screw assembly with recirculating cap and nut
CA1116439A (en) Plural lead ball nut screw actuator
US9546717B2 (en) Ball screw
US7185553B2 (en) Screw feed apparatus
US20100307271A1 (en) Double teeth ball screw apparatus
US11519483B2 (en) Ball screw and assembly method
US20110146436A1 (en) Ball recirculation for a ball screw
EP2514997B1 (en) Ball screw assembly
CN104813073B (en) Ball screw drive
EP1067315A3 (en) Ball screw with ball retainer
US20060243077A1 (en) Ball screw device
US9625017B2 (en) Circulating device for motion guide apparatus
CN117537050A (en) Ball screw drive
CN201116592Y (en) ball nut
US6601676B2 (en) Self-lubricating ballscrew
US12331814B2 (en) Reverse multi-track ball screw
JP2009103201A (en) Outside circulation type ball screw
US6418809B1 (en) Drive spindle

Legal Events

Date Code Title Description
AS Assignment

Owner name: THOMSON SAGINAW BALI SCREW COMPANY, LLC, MICHIGAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WALTON, DENNIS FREDERICK;REEL/FRAME:011766/0812

Effective date: 20010403

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION