WO1998009098A1 - Ball screw nut - Google Patents

Ball screw nut Download PDF

Info

Publication number
WO1998009098A1
WO1998009098A1 PCT/GB1997/002291 GB9702291W WO9809098A1 WO 1998009098 A1 WO1998009098 A1 WO 1998009098A1 GB 9702291 W GB9702291 W GB 9702291W WO 9809098 A1 WO9809098 A1 WO 9809098A1
Authority
WO
WIPO (PCT)
Prior art keywords
nut
slot
thread
edge
screw
Prior art date
Application number
PCT/GB1997/002291
Other languages
French (fr)
Inventor
Barrie Jones
Original Assignee
Barrie Jones
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 Barrie Jones filed Critical Barrie Jones
Publication of WO1998009098A1 publication Critical patent/WO1998009098A1/en

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

  • This invention concerns a nut for a ball screw.
  • the nut completely surrounds the screw for travel therealong as the screw is rotated.
  • Ball bearings are located within the helical channel formed by the threads of the nut and screw, there being an axial channel to transfer the balls from one end of the nut to the other.
  • Sagging can be virtually reduced by supporting the screw at suitable intervals along its length, but a conventional nut cannot pass such support.
  • a nut for a ball screw having an axially extending slot therethrough, the nut incorporating channels to collect ball bearings from the end of each thread at an edge of the slot for return to an end of a thread to allow for continuous recycling of the ball bearings.
  • Ball bearings collected from a thread at one edge of the slot may be returned to the adjacent thread at the same edge of the slot there being a channel to collect ball bearing from one end of the nut for return to the other end of the nut.
  • Ball bearings collected from a thread at one edge of the slot may be returned to the same thread at the other edge of the slot.
  • Figure 1 shows a partially cut-away perspective view of a first form of nut in position on a screw ;
  • Figure 2 shows a fragmentary view on the arrow II of
  • FIG. 3 shows a fragmentary cross-section on the line
  • Figure 4 shows a fragmentary view of the arrow IV of
  • Figure 3 shows a fragmentary view on the arrow V of
  • Figure 6 shows a partially cut-away perspective view of a second form of nut in position on a screw ;
  • FIG. 7 shows a fragmentary view on the arrow VII of
  • FIG. 8 shows a fragmentary cross-section on the line
  • Figure 9 shows a fragmentary view on the arrow IX of
  • the nut generally indicated at 10, partially surrounds a ball screw 11, there being an axially extending slot 12 having a circumferential width of about 120° from end of the nut to the other.
  • the screw 11 can be supported at intervals along its length and the nut 10 can travel the full length of the screw.
  • Ball bearings 14 are located within the channels formed by the threads of the nut and screw.
  • Channels 15 are provided to collect bearings 14 from the end of each thread at an edge of the slot 12 for return to the adjacent thread at the same edge of the slot, there being a channel 16 to collect ball bearings 14 from one end of the nut for return to the other end of the nut.

Landscapes

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

Abstract

There is disclosed a nut (10) for a ball screw (11) having an axially extending slot (12) therethrough, the nut incorporating channels (15) to collect balls from the end of each thread at the edge of the slot (12) guiding the balls to another thread for continuous circulation.

Description

BALL SCREW NUT
This invention concerns a nut for a ball screw.
In a conventional ball screw and nut arrangement, the nut completely surrounds the screw for travel therealong as the screw is rotated. Ball bearings are located within the helical channel formed by the threads of the nut and screw, there being an axial channel to transfer the balls from one end of the nut to the other.
A problem arises with screws of extended length which sag towards the centre of their length putting strain onto the nut and the end retaining bearings for the screw. This introduces inaccuracies in the travel of the nut.
Sagging can be virtually reduced by supporting the screw at suitable intervals along its length, but a conventional nut cannot pass such support.
It is an object of the present invention to provide a nut for a ball screw which can travel past supports for the screw.
According to the present invention there is provided a nut for a ball screw having an axially extending slot therethrough, the nut incorporating channels to collect ball bearings from the end of each thread at an edge of the slot for return to an end of a thread to allow for continuous recycling of the ball bearings. Ball bearings collected from a thread at one edge of the slot may be returned to the adjacent thread at the same edge of the slot there being a channel to collect ball bearing from one end of the nut for return to the other end of the nut.
Ball bearings collected from a thread at one edge of the slot may be returned to the same thread at the other edge of the slot.
The invention will be further apparent from the following description with reference to the several figures of the accompanying drawings, which show, by way of example only, two forms of nut embodying same.
Of the drawings :-
Figure 1 shows a partially cut-away perspective view of a first form of nut in position on a screw ;
Figure 2 shows a fragmentary view on the arrow II of
Figure 1 ;
Figure 3 shows a fragmentary cross-section on the line
III-πi of Figure 2 ;
Figure 4 shows a fragmentary view of the arrow IV of
Figure 3 ; Figure 5 shows a fragmentary view on the arrow V of
Figure 3 ;
Figure 6 shows a partially cut-away perspective view of a second form of nut in position on a screw ;
Figure 7 shows a fragmentary view on the arrow VII of
Figure 6 ;
Figure 8 shows a fragmentary cross-section on the line
VIII-VIII of Figure 7 ; and
Figure 9 shows a fragmentary view on the arrow IX of
Figure 8.
Referring first to Figures 1-5, it will be seen that the nut, generally indicated at 10, partially surrounds a ball screw 11, there being an axially extending slot 12 having a circumferential width of about 120° from end of the nut to the other. In this way the screw 11 can be supported at intervals along its length and the nut 10 can travel the full length of the screw.
Ball bearings 14 are located within the channels formed by the threads of the nut and screw. Channels 15 are provided to collect bearings 14 from the end of each thread at an edge of the slot 12 for return to the adjacent thread at the same edge of the slot, there being a channel 16 to collect ball bearings 14 from one end of the nut for return to the other end of the nut.
It will be understood that as the screw rotates the nut is driven therealong, the ball bearings 14 being continuously recycled around the channels formed by the threads.
Referring now to Figures 6-9, wherein like parts are indicated by like reference numerals, the arrangement is generally similar to that of Figures 1-5 save that channels 20 collect ball bearings 14 from the end of each thread at one edge of the slot for return to the same thread at the other edge of the slot. In this way no return channel from one end of the nut to the other is necessary.
It will be appreciated that it is not intended to limit the invention to the above example only, many variations, such as might readily occur to one skilled in the art, being possible, without departing from the scope thereof.

Claims

C AIMS
1. A nut for a ball screw having an axially extending slot therethrough, the nut incorporating channels to collect ball bearings from the end of each thread at an edge of the slot for return to an end of a thread to allow for continuous recycling of the ball bearings.
2. A nut according to claim 1 wherein ball bearings collected from a thread at one edge of the slot are returned to the adjacent thread a the same edge of the slot there being a channel to collect ball bearing from one end of the nut for return to the other end of the nut.
3. A nut according to claim 1 wherein ball bearings collected from a thread at one edge of the slot are returned to the same thread at the other edge of the slot.
PCT/GB1997/002291 1996-08-29 1997-08-28 Ball screw nut WO1998009098A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9618004.7 1996-08-29
GBGB9618004.7A GB9618004D0 (en) 1996-08-29 1996-08-29 Ball screw nut

Publications (1)

Publication Number Publication Date
WO1998009098A1 true WO1998009098A1 (en) 1998-03-05

Family

ID=10799081

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/002291 WO1998009098A1 (en) 1996-08-29 1997-08-28 Ball screw nut

Country Status (2)

Country Link
GB (1) GB9618004D0 (en)
WO (1) WO1998009098A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20130032A1 (en) * 2013-01-11 2014-07-12 Luigi Reguzzi SCREW STRUCTURE OF BALLS RECIRCULATION.
EP3828438A1 (en) * 2019-11-29 2021-06-02 Szu-Ying Lee Ball screw assembly
EP3828439A1 (en) * 2019-11-29 2021-06-02 Szu-Ying Lee Ball screw assembly
US11293533B2 (en) 2019-11-29 2022-04-05 Szu-Ying Lee Ball screw assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3670583A (en) * 1970-10-19 1972-06-20 Overton Gear And Tool Corp Long span screw and nut drives
EP0281491A1 (en) * 1987-01-30 1988-09-07 Shuton, S.A. A system comprising a recirculating ball spindle and an associated open nut, of use for supported screwthreaded spindles
JPS6469858A (en) * 1987-09-07 1989-03-15 Itl Kk Half split type ball screw
GB2225083A (en) * 1988-11-16 1990-05-23 Thk Co Ltd Ball screw

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3670583A (en) * 1970-10-19 1972-06-20 Overton Gear And Tool Corp Long span screw and nut drives
EP0281491A1 (en) * 1987-01-30 1988-09-07 Shuton, S.A. A system comprising a recirculating ball spindle and an associated open nut, of use for supported screwthreaded spindles
JPS6469858A (en) * 1987-09-07 1989-03-15 Itl Kk Half split type ball screw
GB2225083A (en) * 1988-11-16 1990-05-23 Thk Co Ltd Ball screw

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 267 (M - 840) 20 June 1989 (1989-06-20) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20130032A1 (en) * 2013-01-11 2014-07-12 Luigi Reguzzi SCREW STRUCTURE OF BALLS RECIRCULATION.
WO2014108792A1 (en) * 2013-01-11 2014-07-17 Luigi Reguzzi Recirculating ball screw construction
EP3828438A1 (en) * 2019-11-29 2021-06-02 Szu-Ying Lee Ball screw assembly
EP3828439A1 (en) * 2019-11-29 2021-06-02 Szu-Ying Lee Ball screw assembly
US11293533B2 (en) 2019-11-29 2022-04-05 Szu-Ying Lee Ball screw assembly

Also Published As

Publication number Publication date
GB9618004D0 (en) 1996-10-09

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