WO2006046636A1 - ねじ装置 - Google Patents
ねじ装置 Download PDFInfo
- Publication number
- WO2006046636A1 WO2006046636A1 PCT/JP2005/019769 JP2005019769W WO2006046636A1 WO 2006046636 A1 WO2006046636 A1 WO 2006046636A1 JP 2005019769 W JP2005019769 W JP 2005019769W WO 2006046636 A1 WO2006046636 A1 WO 2006046636A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rolling
- rolling element
- screw shaft
- path
- nut body
- Prior art date
Links
- 238000005096 rolling process Methods 0.000 claims abstract description 191
- 230000002093 peripheral effect Effects 0.000 claims abstract description 26
- 238000009413 insulation Methods 0.000 claims description 29
- 229920001971 elastomer Polymers 0.000 claims description 25
- 239000000806 elastomer Substances 0.000 claims description 20
- 239000011347 resin Substances 0.000 claims description 17
- 229920005989 resin Polymers 0.000 claims description 17
- 239000000314 lubricant Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 239000006096 absorbing agent Substances 0.000 claims description 6
- 229910010293 ceramic material Inorganic materials 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- -1 Calcium aluminate compound Chemical class 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000004519 grease Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
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
- F16H25/2204—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
- F16H25/2219—Axially mounted end-deflectors
-
- 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
-
- 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
- F16H57/00—General details of gearing
- F16H57/0006—Vibration-damping or noise reducing means specially adapted for gearings
-
- 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 screw device in which a rolling element is interposed between a screw shaft and a nut so as to allow rolling motion.
- a ball screw in which a ball is interposed between a screw shaft and a nut so as to allow rolling motion can reduce a friction coefficient when the screw shaft is rotated with respect to a nut, compared with a screw that is in sliding contact. It has been put into practical use in various fields such as machine tool positioning mechanisms, feed mechanisms, and automobile steering gears.
- Ball screw nuts are classified into a return pipe type, a deflector type, and an end cap type according to the ball circulation method.
- Return pipe nuts are the most common nuts, and return pipes are used for ball circulation.
- the ball is picked up from the screw shaft by the return pipe, passes through the return pipe and returns to its original position and circulates.
- the deflector type nut is a compact nut.
- the deflecting direction of the ball is changed by the deflector, and the ball returns to its original position and circulates even after overcoming the outer periphery of the screw shaft.
- End cap nuts are suitable for high-speed feeding.
- the ball is scooped up from the screw shaft by the end cap, circulates back to the original position through the through hole of the nut.
- An end cap type ball screw is disclosed in Patent Document 1.
- Patent Document 1 International Publication No. WO2003Z021133 Pamphlet
- the circulation path of the ball has a tar that changes the direction of the ball. Is provided.
- the ball comes into contact with the wall surface of the turn part and generates sound.
- the force that can prevent the balls from contacting each other simply by interposing the retainer between the balls Ball force S The sound generated by contacting the S-turn part cannot be reduced, resulting in insufficient sound insulation measures Met.
- the deflector type nut also has the same problem because the deflector where the turn part is formed is exposed to the outside.
- an object of the present invention is to provide a screw device that can block sound generated from the inside of the screw device.
- the invention of claim 1 includes a screw shaft (1) in which a spiral rolling element rolling groove (la) is formed on an outer peripheral surface, and the screw shaft ( A spiral loaded rolling element rolling groove (2a) facing the rolling element rolling groove (la) of 1) is formed, and the loaded rolling element rolling groove (2a) and the screw shaft (1)
- Sound insulation material (11) in contact with It is characterized by providing.
- the invention of claim 2 is the screw device according to claim 1, wherein the sound insulating member (11) is a self-lubricating material cover containing a lubricant.
- the invention of claim 3 is the screw device according to claim 1 or 2, wherein the sound insulating member (11) is in contact with the circulation member (9).
- the invention of claim 4 is the screw device according to any one of claims 1 to 3, wherein the circulation device.
- a lid member (13) having a through hole (13a) that is attached to the nut body (2) to which the ring member (9) is attached via the sound insulation member (11) and through which the screw shaft (1) passes.
- the lid member (13) is characterized in that it is made of a resin mixed with an elastomer.
- the invention of claim 5 is the screw device according to any one of claims 1 to 4, wherein the circulating member (9) is made of a resin mixed with an elastomer.
- the invention of claim 6 is the screw device according to any one of claims 1 to 5, wherein a retainer (4) is interposed between the rolling elements (3), and the rolling element (3) is made of ceramic.
- a hollow portion extending in the axial direction is formed on the screw shaft (1), and the hollow portion is filled with a ceramic material as a vibration absorber (15)! It is characterized by scolding.
- the invention of claim 7 includes a screw shaft (1) in which a spiral rolling element rolling groove (la) is formed on an outer peripheral surface, and the rolling element rolling of the screw shaft (1) on an inner peripheral surface.
- a spiral loaded rolling element rolling groove (2a) facing the running groove (la) is formed, and the loaded rolling element rolling groove (2a) and the rolling element rolling groove of the screw shaft (1) are formed.
- the lid member (13) is made of a resin mixed with elastomer. Threading characterized by It is.
- the invention of claim 8 includes a screw shaft (1) in which a spiral rolling element rolling groove (la) is formed on an outer peripheral surface, and the rolling element rolling of the screw shaft (1) on an inner peripheral surface.
- a spiral loaded rolling element rolling groove (2a) facing the running groove (la) is formed, and the loaded rolling element rolling groove (2a) and the rolling element rolling groove of the screw shaft (1) are formed.
- the member (9) is a screw device characterized in that it is made of a resin mixed with an elastomer.
- the invention's effect [0016] According to the invention of claim 1, a so-called end cap type nut in which the circulation member and the rolling element return passage are not easily exposed to the outside is adopted, and the circulation member is also covered with the sound insulation member.
- the sound generated in the direction change path (turn part) can be effectively insulated, and a low noise screw device can be obtained.
- the sound insulating member is in contact with the screw shaft, the gap force sound generated between the sound insulating member and the screw shaft does not leak outside.
- the sound generated from the circulation member can be further reduced by bringing the sound insulation member into contact with the circulation member.
- the lid member made of grease mixed with the elastomer absorbs the sound, the sound generated by the screw device force can be further reduced.
- the sound generated by the circulation member force when the rolling element comes into contact with the circulation member is produced by manufacturing the circulation member in contact with the rolling element with the resin mixed with the elastomer. Can be reduced.
- the rolling elements made of ceramic, it is possible to reduce the sound generated from the rolling elements, and by interposing the retainer between the rolling elements, contact between the rolling elements.
- the screw shaft by filling the screw shaft with a ceramic material, it is possible to reduce the noise generated by the screw shaft force. Therefore, a screw device with lower noise can be obtained.
- the sound generated from the screw device is reduced by the lid member made of the resin mixed with the elastomer.
- the sound generated from the circulation member when the rolling element comes into contact is reduced by manufacturing the circulation member that comes into contact with the rolling element from the resin mixed with the elastomer. Togashi.
- FIG. 1 is a perspective view of a ball screw according to an embodiment of the present invention.
- FIG. 2 is a perspective view of a screw shaft.
- FIG. 3 is a view showing the nut body (FIG. (A) shows a cross-sectional view along the axial direction of the nut body, and FIG. (B) shows a front view of the nut body as seen in the axial force of the nut body).
- FIG. (A) shows a cross-sectional view along the axial direction of the nut body
- FIG. (B) shows a front view of the nut body as seen in the axial force of the nut body).
- ⁇ 4 Perspective view of nut body and circulation member.
- FIG. 5 is a detailed view of the circulation member (in a state where the inner peripheral side and the outer peripheral side are separated).
- FIG. 6 is a detailed view of the circulation member (in a state where the inner peripheral side and the outer peripheral side are coupled).
- FIG. 7 Diagram showing the trajectory of a ball circulating in a load ball rolling path, an arc-shaped direction changing path, and a linear ball return path
- Fig. (A) shows the trajectory of a ball moving on the load ball rolling path
- Fig. (B) shows the trajectory of the ball circulating through the entire infinite circuit (as viewed from the side of the screw shaft)).
- FIG. 8 Diagram showing the scooping direction of the ball (Fig. (A) shows the state seen from the axial direction of the screw shaft, and Fig. (B) shows the state seen from the side force of the screw shaft.
- FIG. 10 A diagram showing a lid member (Fig. (A) shows a front view, and Fig. (B) shows a cross-sectional view taken along line XX of Fig. (A)).
- ⁇ 12 A graph comparing the noise level when using a standard product (torque force) for the lid member and when using a low-noise material (grease mixed with elastomer).
- FIG. 1 is a perspective view of a ball screw as a screw device according to an embodiment of the present invention.
- the ball screw includes a screw shaft 1 having a ball rolling groove la as a spiral rolling element rolling groove formed on the outer peripheral surface, and a spiral load rolling element facing the ball rolling groove la on the inner peripheral surface.
- a nut body 2 in which a loaded ball rolling groove 2a is formed as a rolling groove.
- a plurality of balls 3 are arranged as rolling elements between the ball rolling groove la of the screw shaft 1 and the loaded ball rolling groove 2a of the nut body 2.
- a retainer 4 is interposed between the balls 3 to prevent the balls 3 from contacting each other.
- a through hole 17 extending in parallel with the axis of the nut body 2 is formed inside the nut body 2.
- a pipe body (not shown) is inserted into the through-hole 17, and a ball return passage 6 extending in the axial direction is formed inside the noise body.
- Recesses 8 are formed on both end faces of the nut body 2 in the axial direction, and circulation members 9 constituting the direction changing path 5 are attached to the recesses 8.
- the direction change path 5 has an arcuate track connecting the load ball rolling path and the ball return path 6.
- the circulation member 9 scoops up the ball 3 rolling in the ball rolling groove la of the screw shaft 1, passes the direction change path 5, and then guides it to the ball return path 6.
- the circulating member 9 is coupled to the end surface of the nut body 2 by fastening means such as bolts.
- the end surface of the nut body 2 covers the circulating member 9 and the entire inner peripheral surface contacts the screw shaft 1.
- a sound insulation member 11 is attached.
- the sound insulation member 11 is in close contact with the end surface 2b of the nut body 2 and the circulation member 9.
- the external shape of the sound insulating member 11 is substantially equal to the external shape of the nut body 2.
- the lid member 13 is attached to the nut body 2 with the sound insulation member 11 interposed therebetween.
- the lid member 13 has a hole through which the screw shaft 1 passes, and does not contact the screw shaft 1.
- a gap 13c between the lid member 13 and the sound insulation member 11 is provided with a labyrinth seal or a Wino ring (ring-shaped seal) in order to remove foreign matter and prevent the lubricant from leaking from the inside of the nut body 2. Member) is incorporated.
- FIG. 2 shows the screw shaft 1.
- a spiral ball rolling groove la having a predetermined lead is formed on the outer periphery of the screw shaft 1.
- the number of ball rolling grooves la is set to 2 in order to increase the allowable load and shorten the overall length of the nut body 2.
- the above-mentioned circulation member 9 and two pipe bodies are provided in accordance with the two ball rolling grooves.
- the number of rails in the ball rolling groove la can be set variously, such as one, two or three.
- the screw shaft 1 is composed of a metal screw shaft main body 14 having a hollow portion and a ceramic material as a vibration absorber 15 that fills the hollow portion to be applied without gaps.
- the vibration absorber 15 is filled in the hollow portion of the screw shaft main body 14 in the state of powder, granule, or fluid, and is formed into a shape that matches the hollow portion in the hollow portion.
- a hydraulic composition (trade name: Zima, manufactured by Sumitomo Cement Co., Ltd.) mainly composed of a hydraulic powder and a non-hydraulic powder is pressure-filled into the hollow portion of the screw shaft body 14. Then, the vibration absorber 15 having a ceramic material force is integrated with the screw shaft body 14 by hydrothermal synthesis.
- the hydraulic powder means a powder that hardens with water.
- Sulfur compound powder Calcium aluminate compound powder, Calcium fluoroaluminate compound powder, Calcium sulfate aluminate compound powder, Calcium aluminophosphate compound powder, Calcium phosphate compound powder, semi-water or Examples thereof include anhydrous gypsum powder, self-hardening quicklime powder, and a mixture of two or more of these powders.
- Typical examples of such powders include powders such as Portland cement.
- the non-hydraulic powder means a powder that does not harden even when in contact with water alone, but its components are eluted in an alkaline or acidic state or in a high-pressure steam atmosphere. Also included are powders that react with other previously eluted components to form products. By adding such non-hydraulic powder, it becomes possible to increase the filling rate at the time of molding of the molded body, to reduce the porosity of the molded body obtained, and to improve the dimensional stability rate of the molded body. be able to.
- Representative examples of non-hydraulic powders include, for example, calcium hydroxide powder, dihydrate gypsum powder, calcium carbonate powder, slag powder, fly ash, silica stone powder, clay powder, and silica powder. Can do.
- FIG. 3 shows the nut body 2.
- FIG. 3 (A) shows a cross-sectional view along the axial direction of the nut body 2
- FIG. 3 (B) shows a front view of the nut body 2 as viewed from the axial direction of the nut body 2.
- On the inner peripheral surface of the nut body 2 a spiral load ball rolling groove 2 a that faces the ball rolling groove la of the screw shaft 1 is formed.
- the nut body 2 is formed with a through hole 17 extending in the axial direction of the nut body 2.
- the through hole 17 has a central portion 17a with a small diameter, and both end portions 17b on both sides of the central portion are formed with a slightly larger diameter than the central portion 17a.
- a pipe body is inserted into the central portion 17a of the through hole 17, and the circulation member 9 is inserted into both end portions 17b.
- a recess 8 for attaching the circulation member 9 to the nut body 2 is formed on the end surface of the nut body 2 in the axial direction.
- the pipe body and the circulation member 9 are provided in a number (two sets in this embodiment), such as the number of the ball rolling grooves la, and circulate the balls 3 rolling in each of the two ball rolling grooves la.
- FIG. 4 is a perspective view of the nut body 2 and the circulation member 9. As described above, the recess 8 is formed in the end surface 2 b of the nut body 2, and the circulation member 9 is attached to the recess 8.
- FIG. Circulating member 9 is the center of direction change path 5 In this way, it is divided into an inner circumference 20 and an outer circumference 24.
- the inner peripheral side 20 of the circulation member 9 has a main body portion 22 in which a direction changing path 5 having a semicircular cross section is formed, and a flange portion 21 attached to the end surface of the nut main body 2.
- the main body portion 22 is formed with a lifting portion 23 for scooping up the ball 3 from the loaded ball rolling path 10.
- the scooping portion 23 protrudes toward the ball rolling groove la of the screw shaft 1, thereby ensuring the strength of the scooping portion 23.
- the lifting section 23 lifts the ball 3 rolling on the spiral loaded ball rolling path 10 in the tangential direction.
- the outer peripheral side 24 of the circulation member 9 has a main body portion 25 in which a direction changing path 5 having a semicircular cross section is formed, and a flange portion 26.
- a direction changing path 5 having a semicircular cross section is formed.
- the direction change path 5 has an arcuate path.
- the ball 3 rescued in the tangential direction of the load ball rolling path 10 by the lifting section 23 changes direction on the direction changing path 5 and moves along the arcuate start.
- One end 5 a of the direction change path 5 is connected to a pipe body constituting the no-load ball return path 6.
- FIG. 7 shows the trajectory of the ball 3 that circulates through the spiral loaded ball rolling path 10, the arc-shaped direction changing path 5, and the linear ball return path 6.
- Fig. (A) shows the trajectory of the ball 3 moving along the load ball rolling path 10 (as viewed from the axial direction of the screw shaft 1)
- Fig. (B) shows the trajectory of the ball 3 circulating through the entire infinite circuit. Shown (viewed from the side of screw shaft 1).
- the trajectory of the ball 3 on the load ball rolling path 10 becomes a spiral of radius BCD / 2.
- the path of the ball 3 in the ball return path 6 is a straight line parallel to the axis lc of the screw shaft 1.
- the trajectory of the ball 3 on the turning path 5 is an arc with a radius of curvature R.
- the circulation member 9 is made of a resin mixed with an elastomer.
- the circulation member 9 is manufactured by blending elastomer pellets and resin pellets such as nylon, melting them, and then injection-molding them.
- the circulation member 9 rolls the ball 3 or changes the direction of the ball 3, the contact sound between the circulation member 9 and the ball 3 is likely to increase.
- the circulating member 9 With which the ball 3 comes into contact with the resin mixed with the elastomer, the circulating part 9 is brought into contact with the ball 3 and the circulating member 9 when it comes into contact. The sound generated from the material 9 can be reduced.
- FIG. 8 shows the scooping direction of the ball 3.
- the ball 3 is rolled in the circular shape of the load ball rolling path 10 in the tangential direction of the track.
- FIG. 8 (B) when viewed from the side of the screw shaft 1, the ball 3 is rolled in a direction that matches the lead angle.
- FIG. 9 shows the sound insulating member 11.
- the sound insulating member 11 is formed in a thin disk shape.
- the cross section perpendicular to the axial direction of the screw shaft 1 is an irregular circular shape that is not a perfect circle. Even if the axial position of the screw shaft is different, it has the same cross-sectional shape.
- the sound insulation member 11 is formed with an irregularly shaped non-circular hole that matches the cross-sectional shape perpendicular to the axial direction of the screw shaft 1 in the central portion. Thereby, the inner periphery of the sound insulating member 11 and the outer periphery of the screw shaft 1 can be brought into contact with each other.
- the inner diameter of the sound insulating member 11 is made to match the right-angle cross-sectional shape of the screw shaft 1 so that there is no gap. In view of this, there may be a slight gap between the sound insulating member 11 and the screw shaft 1.
- the sound insulating member 11 is made of a self-lubricating material containing a lubricant.
- Self-lubricating materials include LaCS (registered trademark of THK Co., Ltd.) in which a fibrous material is impregnated with a lubricant, and when the rubber is vulcanized, the lubricant is soaked and the lubricant and the rubber are used simultaneously.
- Examples thereof include molded oil-impregnated rubber (for example, oil-impregnated HNB R), and oil-impregnated felt obtained by impregnating a felt with a lubricant.
- the contact surface between the sound insulating member 11 and the screw shaft 1 is supplied with a lubricant owned by the sound insulating member 11 itself.
- the sound insulating member 11 is made of a soft material so as to absorb sound.
- the thickness of the sound insulation member 11 is set to, for example, 1.5 mm or less due to the limitation of the installation space. From the viewpoint of rigidity, the thickness of the sound insulation member 11 is set to 1 mm or more for LaCS and oil-impregnated felt, and 0.3 mm or more for oil-impregnated rubber.
- FIG. 10 shows the lid member 13.
- the lid member 13 is formed with a through hole 13a through which the screw shaft 1 passes.
- the inner diameter ⁇ of the through hole 13a (1 is a cover member 13 larger than the outer diameter of the screw shaft 1 and the screw shaft 1 There is a slight gap between them.
- the lid member 13 includes a close contact portion 13b that is in close contact with the sound insulating member 11, and a seal housing portion 13c.
- the lid member 13 is made of a resin mixed with an elastomer.
- the lid member 13 is manufactured by blending an elastomer pellet and a resin pellet such as nylon, melting them, and then injection-molding them.
- the lid member 13 made of a resin mixed with an elastomer absorbs sound, the sound generated by the ball screw force can be reduced.
- the balls 3 made of ceramic, it is possible to reduce the sound generated from the balls 3, and by interposing the retainers 4 between the balls 3, it is possible to prevent the balls 3 from contacting each other.
- the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention. If any one of the sound insulation member, the lid member, and the circulation member is configured as in the above-described embodiment, there is an effect of reducing sound, so that the rest can be configured as in the conventional case. Moreover, in the said embodiment, although the some circulation member is isolate
- FIG. 11 is a graph comparing the noise levels when the sound insulation member 11 is provided (with a plate) and when it is not provided (without a plate).
- the sound insulation member 11 was made of oil-impregnated rubber. The noise when the ball screw was operated and the background noise when the ball screw was not operated were measured at a distance of lm from the ball screw test device, and the measured force and noise level were obtained. It can be seen that 1.6 dBA can be reduced by providing the sound insulation member 11.
- Fig. 12 is a graph comparing the noise levels when a standard product (torque force) is used for the lid member 13 and when a low-noise material (grease mixed with elastomer) is used. is there. In this graph, no sound insulation is provided in both cases. By using a low noise material for the lid member 13, it can be seen that the noise level can be reduced by 3. ldBA.
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05799347.9A EP1821002B1 (en) | 2004-10-29 | 2005-10-27 | Screw device |
US11/718,198 US8408087B2 (en) | 2004-10-29 | 2005-10-27 | Screw device with sound insulating member |
JP2006543241A JP4953821B2 (ja) | 2004-10-29 | 2005-10-27 | ねじ装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-316586 | 2004-10-29 | ||
JP2004316586 | 2004-10-29 |
Publications (1)
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WO2006046636A1 true WO2006046636A1 (ja) | 2006-05-04 |
Family
ID=36227878
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/019769 WO2006046636A1 (ja) | 2004-10-29 | 2005-10-27 | ねじ装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US8408087B2 (ja) |
EP (1) | EP1821002B1 (ja) |
JP (1) | JP4953821B2 (ja) |
KR (1) | KR101214354B1 (ja) |
CN (1) | CN100480545C (ja) |
WO (1) | WO2006046636A1 (ja) |
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JP2010164152A (ja) * | 2009-01-16 | 2010-07-29 | Shangyin Sci & Technol Co Ltd | 外装式還流部品付きボールスクリュウ |
JP2010196761A (ja) * | 2009-02-24 | 2010-09-09 | Nsk Ltd | ボールねじ |
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JP2016145642A (ja) * | 2015-01-28 | 2016-08-12 | Thk株式会社 | ねじ装置 |
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Also Published As
Publication number | Publication date |
---|---|
CN101052826A (zh) | 2007-10-10 |
EP1821002A1 (en) | 2007-08-22 |
US20090249911A1 (en) | 2009-10-08 |
EP1821002B1 (en) | 2019-05-22 |
CN100480545C (zh) | 2009-04-22 |
JP4953821B2 (ja) | 2012-06-13 |
KR101214354B1 (ko) | 2012-12-20 |
KR20070070247A (ko) | 2007-07-03 |
JPWO2006046636A1 (ja) | 2008-05-22 |
EP1821002A4 (en) | 2012-07-25 |
US8408087B2 (en) | 2013-04-02 |
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