GB2307023A - Re-circulating ballscrew and nut devive - Google Patents

Re-circulating ballscrew and nut devive Download PDF

Info

Publication number
GB2307023A
GB2307023A GB9622734A GB9622734A GB2307023A GB 2307023 A GB2307023 A GB 2307023A GB 9622734 A GB9622734 A GB 9622734A GB 9622734 A GB9622734 A GB 9622734A GB 2307023 A GB2307023 A GB 2307023A
Authority
GB
United Kingdom
Prior art keywords
ballscrew
circulating
groove
nut device
nut
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.)
Granted
Application number
GB9622734A
Other versions
GB2307023B (en
GB9622734D0 (en
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 IBL Ltd
Original Assignee
THOMSON IBL Ltd
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
Priority claimed from GB9523074A external-priority patent/GB9523074D0/en
Application filed by THOMSON IBL Ltd filed Critical THOMSON IBL Ltd
Priority to GB9622734A priority Critical patent/GB2307023B/en
Publication of GB9622734D0 publication Critical patent/GB9622734D0/en
Publication of GB2307023A publication Critical patent/GB2307023A/en
Application granted granted Critical
Publication of GB2307023B publication Critical patent/GB2307023B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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

Abstract

A re-circulating ballscrew and nut device wherein one or more transverse grooves 16 are provided in the ballnut 10 in order to break the number of balls 14 held under load into at least two groups of smaller numbers. Preferably the groove 16 is disposed radially and is sufficiently wide to accommodate at least one ball in its entirety.

Description

Re-circulating Ballscrew and Nut Device This invention relates to re-circulating ballscrew and nut devices.
Ballscrew and nut devices comprise, in general, a helical ball race containing a plurality of endlessly recirculating balls, the race being formed by a helical groove in a shaft and by a corresponding helical groove in the nut.
It is well understood that, when a considerable number of balls are held in such a device under an externally or internally applied load, inter-ball contact can become detrimental to the overall performance of the device.
In order to overcome this problem, the present invention is directed to a re-circulating ballscrew and nut device wherein one or more transverse grooves are provided in the ballnut in order to break the number of balls held under load into at least two groups of smaller numbers.
Preferably, the groove, or grooves, is or are arranged radially in the ballnut.
An example of a device in accordance with the invention is shown in the accompanying drawing, in which Figure 1 is a vertical section through the body of the ballnut; and Figures 2 and 3 are enlarged sections through the nut to illustrate two alternative forms of groove.
The ballnut 10 shown in Figure 1 is provided with an internal helical ballthread 12 which receives a plurality of balls 14 (one of which is shown in enlarged view in Figure 2 and in Figure 3) as is usual in ballscrew and nut devices. For the sake of clarity, the ballscrew shaft is omitted in Figure 1 but is shown partially in Figures 2 and 3.
In order to break the number of balls held under an externally or internally applied load into a series of smaller numbers, at least one transverse groove 16 is provided in the ballnut body. Preferably, as shown in Figure 1, this groove is disposed radially. The width of the groove needs to be such as to accommodate at least one ball in its entirety (see the width W in Figures 2 and 3) and of such a diameter as to contain the ball to a sufficient extent inside the helical groove 18 of the ballscrew shaft 20. The radial groove 16 may be of such a depth d as to exceed the root diameter of the ballthread (see Figure 2), or it may be of a slightly reduced depth as shown in Figure 3 but with a depression 22 so as to remove the contact area of the balltrack only.
By the simple expedient of providing the radial groove 16 in the ballnut body, the problem of reduced performance due to externally or internally applied loads is overcome.

Claims (6)

1. A re-circulating ballscrew and nut device wherein one or more transverse grooves are provided in the ballnut in order to break the number of balls held under load into at least two groups of smaller numbers.
2. A re-circulating ballscrew and nut device according to claim 1, in which the groove is disposed radially in the ballnut body.
3. A re-circulating ballscrew and nut device according to claim 1 or claim 2, in which the groove is sufficiently wide to accommodate at least one ball in its entirety and of such a diameter as to contain the ball to a sufficient. extent inside the helical groove of a ballscrew shaft.
4. A re-circulating ballscrew and nut device according to claim 3, in which the groove is of such a depth as to exceed the root diameter of the ballthread.
5. A re-circulating ballscrew and nut device according to claim 3, in which the groove is of such a depth as to remove the contact area of the balltrack only by means of a depression in the groove.
6. A re-circulating ballscrew and nut device substantially as described herein with reference to the accompanying drawing.
GB9622734A 1995-11-10 1996-10-31 Re-circulating ballscrew and nut device Expired - Fee Related GB2307023B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9622734A GB2307023B (en) 1995-11-10 1996-10-31 Re-circulating ballscrew and nut device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9523074A GB9523074D0 (en) 1995-11-10 1995-11-10 Re-circulating ballscrew and nut device
GB9622734A GB2307023B (en) 1995-11-10 1996-10-31 Re-circulating ballscrew and nut device

Publications (3)

Publication Number Publication Date
GB9622734D0 GB9622734D0 (en) 1997-01-08
GB2307023A true GB2307023A (en) 1997-05-14
GB2307023B GB2307023B (en) 2000-02-09

Family

ID=26308094

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9622734A Expired - Fee Related GB2307023B (en) 1995-11-10 1996-10-31 Re-circulating ballscrew and nut device

Country Status (1)

Country Link
GB (1) GB2307023B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102278440A (en) * 2010-06-08 2011-12-14 朱豪东 Ball screw cap with deep groove track and manufacturing method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2253675A (en) * 1991-03-15 1992-09-16 Thk Co Ltd Ball screw
EP0665392A1 (en) * 1994-01-26 1995-08-02 THOMSON SAGINAW BALL SCREW Company, Inc. Methods of making preloaded ball nut and screw assemblies and the products formed thereby

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2253675A (en) * 1991-03-15 1992-09-16 Thk Co Ltd Ball screw
EP0665392A1 (en) * 1994-01-26 1995-08-02 THOMSON SAGINAW BALL SCREW Company, Inc. Methods of making preloaded ball nut and screw assemblies and the products formed thereby

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102278440A (en) * 2010-06-08 2011-12-14 朱豪东 Ball screw cap with deep groove track and manufacturing method thereof
CN102278440B (en) * 2010-06-08 2014-03-05 朱豪东 Ball screw cap with deep groove track and manufacturing method thereof

Also Published As

Publication number Publication date
GB2307023B (en) 2000-02-09
GB9622734D0 (en) 1997-01-08

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20141031