WO1998008007A1 - Means to transform a rotational movement of a threaded spindle into an axial movement of a nut - Google Patents
Means to transform a rotational movement of a threaded spindle into an axial movement of a nut Download PDFInfo
- Publication number
- WO1998008007A1 WO1998008007A1 PCT/SE1997/001207 SE9701207W WO9808007A1 WO 1998008007 A1 WO1998008007 A1 WO 1998008007A1 SE 9701207 W SE9701207 W SE 9701207W WO 9808007 A1 WO9808007 A1 WO 9808007A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- spindle
- nut
- threads
- means according
- roller
- Prior art date
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
-
- 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
- F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
- F16H25/2261—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers arranged substantially perpendicular to the screw shaft axis
Definitions
- the present invention relates to means according to the preamble of Claim 1.
- the invention provides a completely novel solution to transforming rotary movement of a threaded spindle to linear movement of a nut, or conversely for transforming linear nut movement to rotary spindle movement.
- the invention solves the problems hitherto encountered with known ball screws, i.e. problems such as high friction and therewith high heat generation, loud noise, restricted speed, relatively poor efficiency and the inability to take-up obliquely acting forces.
- the invention as defined in the characterizing clauses of respective Claims provides a means with which friction is restricted completely to purely rolling friction, i.e. negligible friction, and which withstands high rotary speeds and obliquely acting forces, which is silent and which can work in the total absence of axial play.
- Fig. 1 is a schematic part- sectional view of a spindle-nut with which the invention is applied;
- Fig. 2 is a part-sectional view seen in an axial direction along the line II-II in Fig. 1;
- Figs. 3 and 4 illustrate a crown roller in side view and from above respectively, said crown roller forming part of the inventive means;
- Fig. 5 is a partially sectioned side view of another embodiment of the crown roller;
- Fig. 6 is a side view of another crown roller embodiment;
- Fig. 7 illustrates a ball holder for the purpose of clarifying the invention;
- Fig. 1 is a schematic part- sectional view of a spindle-nut with which the invention is applied;
- Fig. 2 is a part-sectional view seen in an axial direction along the line II-II in Fig. 1;
- Figs. 3 and 4 illustrate a crown roller in side view and from above respectively, said crown roller forming part of the inventive means;
- Fig. 8 is a view from one end of a member included in the described embodiment; Figs. 9 and 10 illustrate respectively two other embodiments of the invention; Fig. 11 illustrates very schematically an example of another form of crown roller; and Fig. 12 illustrates schematically examples of different arrangements of crown rollers along the spindle.
- Fig. 1 illustrates a spindle 1 having threads 2 and including one or more thread leads. The threads are only shown schematically in Figs. 1 and 2.
- the spindle 1 is embraced by a nut 3, which will be described in more detail hereinafter.
- the nut 3 shown in Fig. 1 includes two rings or sleeves 4 which include radially extending openings 5. These openings accommodate ball bearing rings 6 which are held radially outwards in place in the openings 5 with the aid of sleeves 7.
- the ball bearing rings extend beyond the outer periphery of the rings 4, and the sleeves 7 are thus provided with corresponding recesses 8 which extend in the axial direction of the sleeves 7.
- the sleeve 7 is pushed in over the ring 4 with the recesses 8 engaging around the ball bearing rings 6.
- the rings 4 are held in place against each other with the aid of end-walls 9, which are locked to one another and to the nut by means of bolts 10 (Fig. 1) disposed uniformly around the end-walls.
- the crown roller is comprised of a hemispherical roller-body part 12 and a roller race 13 coaxial with said body-part 12.
- the crown roller 11 is rotatably mounted about its symmetry axis 14 (Figs. 3 and 6) in the nut 3 by means of ball bearing balls 15 which roll in the ball race 6. In the illustrated embodiment, the balls are separated with the aid of a ball holder 16.
- the crown roller 11 can be said to be planet-mounted by means of the ball bearing balls 15 in the nut 3.
- the crown rollers 11 of two mutually adjacent elements are intended to engage respective opposing flanks of the thread of the spindle, i.e. at points 17 shown in Figs. 1 and 9.
- the distance a. (Fig. 11) between the symmetry lines 14 of two mutually adjacent crown rollers will be smaller than the distance between the two illustrated thread grooves as measured along the line connecting said two points 17.
- the spherical parts of the crown rollers 11 may instead engage the mutually distal flanks of the thread grooves, i.e. the distance a. between the symmetry axes of two crown rollers will be greater than the distance between the threads as measured along said line through the points 17.
- the distance between the symmetry axes 14 of the crown rollers is defined by the mutual abutment of the rings 4.
- the sleeves 7 will be coaxially somewhat shorter than the rings 4 so as not to affect this distance, as indicated in Fig. 1.
- the distance or spacing between said elements may also be adjusted with the aid of washers for instance, which can be placed between the two rings 4 ⁇ this is not shown).
- Figs. 3 and 4 show respectively a crown roller from one side and from above, as described with reference to Figs. 1 and 2.
- Fig. 5 illustrates another embodiment of the crown roller.
- the crown roller is comprised of a ball 18 and a ball seating 19 which, in turn, includes the ball race 13.
- Fig. 6 illustrates an advantageous embodiment of the crown roller 11, in which the ball race 13 is formed directly in the hemi-spherical part of the crown roller, this configuration saving space and being beneficial from a manufacturing/technical aspect.
- Fig. 7 illustrates the ball holder 16 schematically from above. It will noted that the ball holder is not necessary to the function of the invention.
- Fig. 8 is an end view of a sleeve 7 and clearly shows the recesses 8 that accommodate the ball races 6.
- Fig. 9 is a schematic illustration of another proposed coupling of the rings 4, wherewith the crown rollers used are the crown rollers shown in Fig. 6.
- One of these has a peripherally outer left-hand thread 20 for instance, and the other an outer right- hand thread 21.
- a ring 22 having an inner right-hand thread and a left-hand thread respectively embraces the threaded parts of respective sleeve 4 and coacts with their threads 20 and 21.
- the sleeves 4 will be moved towards or away from each other as the ring 22 is turned, depending on the direction in which the ring 22 is turned.
- the distance between the elements can be set precisely with the aid of the ring 22, therewith completely avoiding any axial play.
- the ring 22 When mounted, the ring 22 can be locked in the position intended with the aid, e.g., of locking screws (not shown) , by locking the ring 22 between the sleeves 7 with the aid of bolts, e.g. 10, or by other means obvious to the skilled person.
- the aid e.g., of locking screws (not shown)
- Fig. 10 illustrates a further embodiment of a crown roller 11 used with the inventive means, said crown roller comprising a completely spherical ball in this case.
- the ball race 13 of the illustrated crown roller 11 is formed by the generatrix of the points at which the balls 15 of the ball bearings contact or roll on the ball 11.
- This crown roller embodiment is naturally an attractive solution from a technical aspect of manufacture and functions in the same way as the crown roller embodiments illustrated in Figs. 1 and 9, although it has a slightly lower bearing capacity at corresponding dimensions.
- Fig. 11 illustrates still another embodiment of the crown roller.
- the rolling body-part of the crown roller has the form of a truncated conical roller.
- This crown roller coacts with a spindle 1 that has a trapezium thread.
- the thread flanks have a certain slope, which must not be exceeded.
- the thread flanks have a slope of 45° in the illustrated embodiment.
- the root thread has a lower peripheral speed than the thread apex when the spindle rotates.
- the inventive elements need only perform rotary movement in place in the nut, as opposed to the case in conventional ball screws, in which the balls roll with rotation of the screw, and the elements can be used with spindles that have right-hand and left- hand threads with one or more leads and different pitches.
- the elements may either lie in a plane perpendicular to the spindle axis or along parallel lines that follow the spindle threads.
- Fig. 12 illustrates very schematically an example of different arrangements of the elements 11 in relation to the threads 2 which, extended, shall represent a threaded spindle having three leads. Shown at the bottom of the Figure is two rows of elements which lie in a plane perpendicular to the axis of the spindle.
- the spindle of the illustrated example has only three leads, only three elements can be arranged in each row or line.
- the penultimate part of the Figure illustrates the elements disposed in lines that follow the threads 2, wherewith two mutually adjacent elements in respective lines are directed along lines that extend parallel with the axis of the spindle. Because the placement of the elements follows the threads, a maximum number of elements can be used.
- the third part of the Figure as seen from the bottom thereof shows elements arranged along the threads, although in this case two mutually adjacent elements lying in their respective lines are directed on a line which extends perpendicular to the slope of the thread to the axis of the spindle.
- the uppermost part of Fig. 12 shows the elements running in only one thread.
- each alternate crown roller will lie against one flank of the thread and each other alternate crown roller will lie against the other flank of the thread, as indicated in this part of the Figure.
- the elements will, in this case, thus be disposed in a zig-zag pattern along the thread. It will be understood that the lines of elements may be disposed along more than one turn of the thread. This latter arrangement can be particularly appropriate in the case of spindles that have only one lead. It will be understood from the aforegoing and from Fig. 12 that the person skilled in this art has a high degree of freedom in arranging the inventive elements and also of using screw threads of varying profiles, including trapezium threads having sloping thread flanks, as earlier mentioned.
- the invention provides a completely novel solution to problems encountered with ball screws and can be adapted to all types of threaded spindles, screw threads, ridges and grooves. It is emphasized that the construction of the nut itself and fitting of the ball races can be effected in many different ways and that the solution described and illustrated in this document is an advantageous technical solution.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97933098A EP0859921A1 (en) | 1996-08-23 | 1997-07-03 | Means to transform a rotational movement of a threaded spindle into an axial movement of a nut |
CA002230096A CA2230096A1 (en) | 1996-08-23 | 1997-07-03 | Means to transform a rotational movement of a threaded spindle into an axial movement of a nut |
JP10507849A JPH11514076A (en) | 1996-08-23 | 1997-07-03 | Means for converting the rotational movement of a threaded spindle into the axial movement of a nut |
AU36379/97A AU3637997A (en) | 1996-08-23 | 1997-07-03 | Means to transform a rotational movement of a threaded spindle into an axial movement of a nut |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9603064A SE9603064L (en) | 1996-08-23 | 1996-08-23 | Elements for converting the rotation of a screw spindle to axial movement of a nut |
SE9603064-8 | 1996-08-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998008007A1 true WO1998008007A1 (en) | 1998-02-26 |
Family
ID=20403636
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1997/001207 WO1998008007A1 (en) | 1996-08-23 | 1997-07-03 | Means to transform a rotational movement of a threaded spindle into an axial movement of a nut |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0859921A1 (en) |
JP (1) | JPH11514076A (en) |
AU (1) | AU3637997A (en) |
CA (1) | CA2230096A1 (en) |
SE (1) | SE9603064L (en) |
WO (1) | WO1998008007A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120012425A1 (en) * | 2009-01-23 | 2012-01-19 | Isao Hayase | Linear actuator and forklift truck |
CN113892003A (en) * | 2019-05-29 | 2022-01-04 | 水野逸人 | Ball screw mechanism and linear movement device |
KR102574821B1 (en) * | 2022-12-07 | 2023-09-06 | 이종기 | Anti-backlash ball nut and rectilinear movement apparatus comprising the same |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102459956A (en) * | 2009-06-22 | 2012-05-16 | 日立建机株式会社 | Linear actuator and forklift |
JP5337895B2 (en) * | 2012-04-26 | 2013-11-06 | 株式会社日立製作所 | Feed screw device, linear actuator and lift device |
KR102490898B1 (en) * | 2022-05-12 | 2023-01-20 | 이종기 | Anti-backlash ball nut and rectilinear movement apparatus comprising the same |
WO2023219461A1 (en) * | 2022-05-12 | 2023-11-16 | 이종기 | Anti-backlash ball nut and linear motion device including same |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5028217A (en) * | 1988-04-13 | 1991-07-02 | Miller Franz Georg | Apparatus for converting rotational movement into reciprocating lifting movement |
DE4334477A1 (en) * | 1993-10-11 | 1995-04-13 | Miller Annette | Device for converting a rotary motion into a reciprocating motion and vice versa |
-
1996
- 1996-08-23 SE SE9603064A patent/SE9603064L/en not_active IP Right Cessation
-
1997
- 1997-07-03 JP JP10507849A patent/JPH11514076A/en active Pending
- 1997-07-03 CA CA002230096A patent/CA2230096A1/en not_active Abandoned
- 1997-07-03 EP EP97933098A patent/EP0859921A1/en not_active Withdrawn
- 1997-07-03 WO PCT/SE1997/001207 patent/WO1998008007A1/en not_active Application Discontinuation
- 1997-07-03 AU AU36379/97A patent/AU3637997A/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5028217A (en) * | 1988-04-13 | 1991-07-02 | Miller Franz Georg | Apparatus for converting rotational movement into reciprocating lifting movement |
DE4334477A1 (en) * | 1993-10-11 | 1995-04-13 | Miller Annette | Device for converting a rotary motion into a reciprocating motion and vice versa |
Non-Patent Citations (2)
Title |
---|
DERWENT'S ABSTRACT, No. 93-270580/34, week 9334; & SU,A,1 753 116 (TERNOPOL SECT LVOV POLY), 7 August 1992. * |
PATENT ABSTRACTS OF JAPAN, Vol. 7, No. 177, M-233; & JP,A,58 081 259 (SADAHITO NAKAGAWA), 16 May 1983. * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120012425A1 (en) * | 2009-01-23 | 2012-01-19 | Isao Hayase | Linear actuator and forklift truck |
CN113892003A (en) * | 2019-05-29 | 2022-01-04 | 水野逸人 | Ball screw mechanism and linear movement device |
US20220260140A1 (en) * | 2019-05-29 | 2022-08-18 | Hayato Mizuno | Ball screw mechanism and linear moving device |
US11808329B2 (en) * | 2019-05-29 | 2023-11-07 | Hayato Mizuno | Ball screw mechanism and linear moving device |
CN113892003B (en) * | 2019-05-29 | 2024-01-12 | 水野逸人 | Ball screw mechanism and linear movement device |
KR102574821B1 (en) * | 2022-12-07 | 2023-09-06 | 이종기 | Anti-backlash ball nut and rectilinear movement apparatus comprising the same |
Also Published As
Publication number | Publication date |
---|---|
CA2230096A1 (en) | 1998-02-26 |
AU3637997A (en) | 1998-03-06 |
SE505153C2 (en) | 1997-07-07 |
SE9603064L (en) | 1997-07-07 |
JPH11514076A (en) | 1999-11-30 |
SE9603064D0 (en) | 1996-08-23 |
EP0859921A1 (en) | 1998-08-26 |
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