WO2007013266A1 - ねじ装置の製造方法及びねじ装置 - Google Patents
ねじ装置の製造方法及びねじ装置 Download PDFInfo
- Publication number
- WO2007013266A1 WO2007013266A1 PCT/JP2006/313276 JP2006313276W WO2007013266A1 WO 2007013266 A1 WO2007013266 A1 WO 2007013266A1 JP 2006313276 W JP2006313276 W JP 2006313276W WO 2007013266 A1 WO2007013266 A1 WO 2007013266A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- groove
- nut
- flat plate
- rolling
- screw device
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005096 rolling process Methods 0.000 claims abstract description 183
- 238000005452 bending Methods 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims description 27
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 238000004804 winding Methods 0.000 description 8
- 239000004033 plastic Substances 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
- 230000013011 mating Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000004512 die casting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 238000003801 milling Methods 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
- 239000003921 oil Substances 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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- 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
- 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
- F16H25/2223—Cross over deflectors between adjacent thread turns, e.g. S-form deflectors connecting neighbouring threads
-
- 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
- F16H2025/2481—Special features for facilitating the manufacturing of spindles, nuts, or sleeves of screw devices
-
- 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
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49636—Process for making bearing or component thereof
-
- 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
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49636—Process for making bearing or component thereof
- Y10T29/49643—Rotary bearing
- Y10T29/49647—Plain bearing
- Y10T29/49668—Sleeve or bushing making
- Y10T29/49671—Strip or blank material shaping
-
- 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
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49636—Process for making bearing or component thereof
- Y10T29/49643—Rotary bearing
- Y10T29/49647—Plain bearing
- Y10T29/49668—Sleeve or bushing making
- Y10T29/49671—Strip or blank material shaping
- Y10T29/49673—Die-press shaping
-
- 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
-
- 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
-
- 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
-
- 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
- Y10T83/00—Cutting
- Y10T83/02—Other than completely through work thickness
- Y10T83/0304—Grooving
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 be capable of rolling.
- deflector-type ball screws are becoming mainstream.
- a deflector also called a piece
- the deflector is formed with a return groove that connects both ends of a loaded ball rolling groove of less than one turn.
- the return groove of the deflector allows the ball rolling on the spiral loaded ball rolling groove around the screw shaft to pass over the thread of the screw shaft just before making a full rotation around the screw shaft, so that Return to the track.
- Patent Document 1 discloses a ball screw in which a load ball rolling groove and a ball return groove are integrally formed with a semicircular nut.
- a load ball rolling groove and a ball return groove are formed in the nut at the same time as making the nut a semicircle.
- Patent Document 2 states that “a screw shaft having a spiral groove on the outer surface and a spiral groove corresponding to the spiral groove of the screw shaft on the inner surface.
- the ball nut is connected to a screw shaft including a ball nut and a plurality of balls rotatably arranged between the spiral groove of the ball nut and the spiral groove of the screw shaft.
- the internal circulation path (corresponding to the return groove) that forms an annular ball passage on the inner surface is connected to the inner circumference, and the ball nut is axially oriented at one point on the circumference by a radial cut surface that passes through the internal circulation path section.
- Patent Document 2 “A ball screw characterized by being cut into two parts” (see Patent Document 2, scope of claim for utility model registration).
- This Patent Document 2 states that “the tubular member 6 of this ball nut is plasticized using a male die because one place in the circumferential direction is cut in the axial direction. It can be easily removed from the mold by widening the cut surface 8 even when it is molded by a characteristic cage ”(Patent Document 2, page 5, lines 7 to 11).
- Patent Document 1 Japanese Patent Application Laid-Open No. 56-46158
- Patent Document 2 Japanese Utility Model Publication No. 58-52358
- the ball screws described in these documents have an advantage of high productivity because the ball screw nut is formed by a mold. However, there is a problem that it is difficult to ensure the strength of the ball screw nut.
- the ball screw described in Patent Document 2 uses a thin plate material that can be easily spread at the cut surface when the ball screw nut is removed by male force. Since it cannot function as a nut by itself, it is reinforced with resin or an outer cylinder.
- an object of the present invention is to provide a screw device manufacturing method and a screw device that are highly productive and can ensure the strength of a nut.
- the invention according to claim 1 is directed to the spiral rolling element rolling groove (la) of the screw shaft (1) and the rolling element rolling groove (la).
- Screw device manufacturing method in which a plurality of rolling elements (4) are interposed between spirally loaded rolling element rolling grooves (2a, 14, 32) of nuts (2, 24, 26, 36)
- the invention according to claim 2 is the method of manufacturing the screw device according to claim 1, wherein the nut (2, 24, 26, 36) is the rolling element rolling of the screw shaft (1).
- the loaded rolling element rolling groove (2a, 14, 32) less than one round facing the groove (la), and the loaded rolling element rolling groove (2a, 14, 32) has at least one single turn groove (9, 13, 19, 30, 34) composed of a return groove (5, 15, 18, 29, 33) that connects one end to the other.
- the at least one single groove (9, 13, 19, 30, 34) force S is formed on the flat plate (8, 12, 20, 22, 28, 31). It is characterized by that.
- the invention according to claim 3 is the method of manufacturing the screw device according to claim 2, wherein in the nut forming step, the return groove (5, 29, 33) is formed on the ring ( 2, 24, 26, 36) It is characterized by coming to the seam (10).
- the invention described in claim 4 is the method of manufacturing the screw device according to claim 2 or 3, wherein in the groove forming step, the flat plate (8, 12, 20, 22, 28) One winding groove (9, 13, 19, 30) is machined.
- the invention according to claim 5 is the screw device manufacturing method according to claim 2 or 3, wherein in the groove forming step, the flat plate (31) is provided with the at least one one-turn groove (34). It is characterized by being pre-scanned.
- the invention according to claim 6 is the method for manufacturing the screw device according to claim 5, wherein the method for manufacturing the screw device further forms a reinforcing member (38) around the nut (36). A reinforcing member forming step is provided.
- the invention according to claim 7 includes a screw shaft (1) having a spiral rolling element rolling groove on an outer peripheral surface, and the rolling element rolling groove (of the screw shaft (1) on an inner peripheral surface ( a nut (2, 24, 26, 36) having a loaded rolling element rolling groove (2a, 14, 32) facing la), the rolling element rolling groove (la) of the screw shaft (1),
- a screw device comprising: a plurality of rolling elements (4) arranged between the loaded rolling element rolling grooves (2a, 14, 32) of the nut (2, 24, 26, 36); 2, 24, 26, 36) are obtained by bending a flat plate (8, 12, 20, 22, 28, 31) in which the above-mentioned loaded rolling element rolling grooves (2a, 14, 32) are formed. It is formed by forming a ring.
- the invention according to claim 8 is the screw device according to claim 7, wherein the nut (2, 24, 26, 36) is less than one round facing the rolling element rolling groove (la).
- And has at least one single groove (9, 13, 1 9, 30, 34), and is placed on the flat plate (8, 12, 20, 22, 28, 31). Less Both are characterized by the formation of a single groove (9, 13, 19, 30, 34).
- the invention according to claim 9 is the screw device according to claim 8, wherein the return groove (5, 2, 9, 33) has the nut (2, 24, 26, 36) formed in a ring. It is characterized by coming to the joint (10).
- the nut forming step of bending the flat plate into a ring is provided after the groove forming step of forming the loaded rolling element rolling groove on the flat plate, the strength of the nut is increased. Easy to secure. The compressive force can also leave high compressive stress in the loaded rolling element rolling groove on the inner diameter surface of the nut.
- the ball circulation path can be constituted by the loaded rolling element rolling groove and the return groove formed in the nut.
- the dimensions of the return groove and the loaded rolling element rolling groove formed in the nut are stabilized. Since the flat plate is bent into a ring by plastic working, the planar shape of the load ball rolling groove and return groove changes before and after bending. Specifically, the central portion in the longitudinal direction of the flat plate is greatly deformed in the longitudinal direction, while the end portion in the longitudinal direction of the flat plate becomes free when bent, so that it does not deform much in the longitudinal direction.
- the return groove has a special shape compared to the load ball rolling groove. By bringing a special shape of the return groove to the end of the flat plate, the planar shape of the load ball rolling groove between the return groove and the return groove It is possible to stabilize.
- the plate thickness of the flat plate can be increased and the strength of the nut can be increased.
- the strength of the nut can be ensured.
- the ball circulation path can be constituted by the loaded rolling element rolling groove and the return groove formed in the nut.
- the dimensions of the return groove and the loaded rolling element rolling groove formed in the nut are stabilized. Since the flat plate is bent into a ring by plastic working, the planar shape of the load ball rolling groove and return groove changes before and after bending. Specifically, the central portion in the longitudinal direction of the flat plate is greatly deformed in the longitudinal direction, while the end portion in the longitudinal direction of the flat plate becomes free when bent, so that it does not deform much in the longitudinal direction.
- the return groove has a special shape compared to the load ball rolling groove.
- FIG. 1 is a perspective view showing a screw device according to an embodiment of the present invention.
- FIG. 2 Perspective view of the screw device (including a partial cross section)
- FIG. 3 Perspective view showing the ball rolling around the screw shaft
- FIG. 4 is a perspective view showing a flat plate having a single winding groove.
- FIG.5 Plant view showing a flat plate with winding grooves
- FIG. 6 Perspective view showing a nut wound around a ring
- FIG. 7 Perspective view showing a nut wound around a ring
- FIG. 8 is a plan view showing another example of a single groove formed on a flat plate.
- FIG. 9 Plan view showing another example of a single groove formed on a flat plate ((A) in the figure shows an example in which the phase of the return groove is shifted, and (B) in the figure shows that the flat plate has a parallelogram shape) Example)
- FIG. 10 is a side view showing an example in which a large number of dimples are formed on a flat plate.
- FIG. 11 Sectional view showing an example of lining a flat plate
- FIG. 12 is a perspective view showing an example in which a notch is formed in the nut.
- FIG. 13 Perspective view showing an example in which a notch is formed in a nut (including a partial cross section)
- FIG. 14 is a perspective view showing an example in which a flange is formed on the nut.
- FIG. 15 is a perspective view showing an example in which a flange is formed on the nut (including a partial cross section).
- FIG. 16 is a perspective view showing an example in which one winding groove is formed on a flat plate by press drawing.
- FIG. 17 is a perspective view showing an example in which a flat plate is used as a ring to form a nut.
- FIG. 18 is a perspective view showing an example of die-casting a nut
- Ball rolling path (rolling element rolling path)
- FIG. 1 and 2 show a screw device according to an embodiment of the present invention.
- FIG. 1 shows a perspective view of the screw device
- FIG. 2 also shows a perspective view (including a partial cross-section) of the screw device.
- the rolling element rolling groove la of the screw shaft 1 and the loaded rolling element rolling groove 2a of the nut 2 are aligned at the same position, and a ball 4 as a rolling element is inserted into the rolling element rolling path 3 generated thereby. Is.
- a ball rolling groove la is formed as a spiral rolling element rolling groove having a predetermined lead.
- the cross-sectional shape of the ball rolling groove la is formed into a so-called Gothic arch groove shape combining two arcs. Ball 4 and ball rolling groove la come into contact at two points.
- a load ball is formed as a spiral loaded rolling element rolling groove of less than one round.
- a rolling groove 2a is formed.
- the loaded ball rolling groove 2a has a lead equal to the ball rolling groove la of the screw shaft 1. Both ends of the load ball rolling groove 2a are connected by a return groove 5 having a reverse lead to the load ball rolling groove 2a.
- the return groove 5 corresponds to a deflector type ball screw piece.
- the loaded ball rolling groove 2a and the return groove 5 constitute one winding groove. The configuration of the single winding groove will be described later.
- a plurality of balls 4 are arranged so as to be capable of rolling motion.
- the plurality of balls 4 roll while being loaded between the loaded ball rolling groove 2a and the ball rolling groove la. Since the lead is attached to the load ball rolling groove 2a and the ball rolling groove la, the nut 2 moves in the axial direction of the screw shaft 1. The ball 4 rolled to one end of the loaded ball rolling groove 2a of the nut 2 reaches the return groove 5mm.
- the return groove 5 returns the ball 4 rolling on the ball rolling groove la of the screw shaft 1 to the ball rolling groove la before one winding after getting over the screw thread. At this time, the ball 4 lifts the thread 6 while being supported between the corner 6 a of the thread 6 (see FIG. 3) and the return groove 5 of the nut 2. If the inner diameter of the nut 2 is made smaller than the diameter of the center track of the ball 4 rolling on the ball rolling groove la as viewed from the axial direction of the screw shaft 1, the ball 4 can be easily lifted. The ball 4 that has passed over the thread 6 falls into the ball rolling groove la while being supported between the opposite corner 6b of the thread 6 and the return groove 5.
- the one-turn groove 9 composed of the load ball rolling groove 2a and the return groove 5 is formed on the rectangular flat plate 8 (groove forming step).
- the longitudinal direction of the flat plate 8 is the circumferential direction of the nut.
- the locus of the loaded ball rolling groove 2a is a straight line inclined by a predetermined lead angle with respect to the longitudinal direction of the flat plate on the plane. More specifically, the trajectory of the loaded ball rolling groove 2a is a developed view on the ball circular diameter when the nut is used as a nut, and is drawn as a straight line inclined by the lead angle. The shape expands in the length direction according to the amount of deformation. As a result of the amount of plastic deformation, the line is slightly inclined from the lead angle.
- Return grooves 5 are formed at both ends of the load ball rolling groove 2a.
- the planar shape of the return groove 5 is The shape is a combination of an arc and a straight line, and extends to the end of the flat plate 8. More specifically, the planar shape of the return groove 5 is a combination of an ellipse and a straight line due to the amount of plastic deformation. The depth of the return groove 5 is deeper than the depth of the load ball rolling groove 2a.
- the one-turn groove 9 extends from one side 8a to the other side 8b facing the one side 8a. These sides 8a and 8b become seams 10 when the flat plate is bent into a ring.
- the distance L1 from the remaining side 8c of the flat plate 8 to the center of the return groove 5 on one side 8a is equal to the distance L2 from the remaining side 8c of the flat plate 8 to the center of the return groove 5 on the other side 8b. This is because when the flat plate 8 is wound, the positions of the return grooves 5 at both ends of the flat plate 8 are matched (see FIG. 6).
- two rows of one-turn grooves 9 are formed, but the number of rows is variously formed such as three rows or four rows.
- the planar shapes of the load ball rolling groove 2a and the return groove 5 change before and after bending. This is because the direction of elongation in the width direction and the longitudinal direction when bent differs depending on the location. Specifically, the central portion in the longitudinal direction of the flat plate 8 is greatly deformed in the longitudinal direction, while the end portion in the longitudinal direction of the flat plate 8 becomes free when bent, so that it does not deform much in the longitudinal direction.
- the return groove 5 has a special shape compared to the load ball rolling groove 2a.
- the cross-sectional shapes of the load ball rolling groove 2a and the return groove 5 before bending are determined while observing changes in the cross-sectional shapes of the load ball rolling groove 2a and the return groove 5.
- the groove width and depth of the loaded ball rolling groove 2a and the return groove 5 formed in the groove forming process are formed into a ring in consideration of deformation during the nut forming process.
- Load ball of nut 2 Make the width larger than the width and depth of rolling groove 2a and return groove 5.
- the cross-sectional shape of the loaded ball rolling groove of a general ball screw nut is a two circular force.
- the load ball rolling groove 2a of the nut 2 of the present embodiment has a circular arc groove shape having a single arc force.
- the groove width and depth of the loaded ball rolling groove 2a formed in the groove forming step are set to be larger than the lateral width and depth of the loaded ball rolling groove 2a of the nut 2 in a ring. Is done.
- the cross-sectional shape of the load ball rolling groove 2a is formed in a circular arc groove shape. Therefore, the cross-sectional shape of the load ball rolling groove 2a formed in the groove forming step is formed into an arc having a larger radius of curvature than the cross-sectional shape of the load ball rolling groove 2a of the nut 2 formed into a ring.
- the one-turn groove 9 is formed in the flat plate 8 by cutting.
- the cutting process is performed, the single groove 9 can be formed even if the plate is thick, and the strength of the nut 2 can be increased.
- the cutting process is performed, there is an effect that the one-turn groove 9 can be formed with high accuracy.
- the material of the flat plate 8 for example, carbon steel or the like is used so that the nut 2 can be tempered after being made into a ring.
- the one-turn groove 9 may be ground.
- the reason for grinding at this stage is that it is difficult to grind the single groove 9 after the flat plate 8 is bent into a ring. By grinding the single groove 9, the ball can be moved smoothly.
- FIG. 6 and FIG. 7 show the nut 2 bent into a ring.
- the flat plate 8 is bent into a perfect circle by a bending machine.
- Various methods can be used for bending, such as bending by bending a part of the flat plate 8 while pressing the other end and bending using a roll.
- the joints 10 at both ends of the flat plate 8 are in close contact with each other.
- the quality of the nut 2 formed on the ring is controlled by the roundness of the inner diameter of the nut 2.
- the roundness of the inner diameter of nut 2 is controlled by passing a core rod or bush through nut 2.
- the nut 2 After making the nut 2 into a ring, the nut 2 is quenched. A single groove may be polished after quenching. If the strength of the nut 2 is ensured, the quenching process may be omitted.
- the ball rolling path 3 between the nut 2 and the screw shaft 1 is filled with a plurality of balls 4. Bring the nut 2 close to the end of the screw shaft 1 and create an annular gap between the load ball rolling groove 2a and return groove 5 of the nut 2 and the ball rolling groove la of the screw shaft 1. . Then, the balls 4 are filled into the annular gap.
- FIG. 8 shows another example of the one-turn groove 13 formed in the flat plate 12 in the groove forming step.
- the one-turn groove 13 includes a load ball rolling groove 14 and a return groove 15.
- the return groove 15 is formed at the center in the longitudinal direction of the flat plate 12. As in this example, the return groove 15 need not be arranged at the joint 16 of the flat plate 12. In this example, the force of aligning the phases of the two return grooves 15 may be shifted in the circumferential direction of the nut 2 to increase the degree of freedom in design!
- FIG. 9 (A) shows an example in which the phase of the return groove 18 is shifted in the circumferential direction in the groove forming step.
- FIG. 9B shows still another example in which the flat plate 28 is formed into a parallelogram.
- the return groove 29 is arranged at the end (joint 10) of the flat plate 28.
- the center line of the return groove 29 is perpendicular to the end of the flat plate 28. Then, the phase of the return groove 29 is inevitably shifted, and the distance between adjacent one-turn grooves 30 can be shortened. Since the return groove 29 is cut at a right angle, the product is stable as a product.
- FIG. 10 shows an example in which a large number of dimples 21 (dents) are formed on the side of the flat plate 20 where the load ball rolling groove is formed in the groove forming step.
- dimple 21 dents
- nut 2 is flat 20 Formed when. With a ball screw, it is difficult to create a space for storing lubricating oil.
- the dimple 21 can function as an oil sump.
- the nut 2 can have panel characteristics, so that when a load force is applied to the nut 2, the load can be distributed to a plurality of balls.
- FIG. 11 shows an example in which a lining 23 of Teflon (registered trademark), for example, is applied to the side of the flat plate 22 on which the load ball rolling groove is formed in the groove forming step. Since the lining 23 is applied when the nut is the flat plate 22, the lining 23 can be easily formed.
- the nut 2 can function as a bush that supports the screw shaft 1 in the radial direction by bringing the lining 23 into close contact with the screw shaft.
- FIG. 12 and FIG. 13 show another example of the nut 24 manufactured by the method for manufacturing the screw device of the first embodiment.
- the nut 24 is formed with a notch 25 when it is flat. After that, when the flat plate is rolled, a notch can be formed in the nut 24 without the need to bother cutting with a milling machine or the like. Since the nut 24 is a sheet metal molded body, the notch 25 for attaching the nut 24 to the mating part can be easily formed. The notch of the nut 24 is attached to a mating part that stops the rotation of the nut 24.
- the nut 26 is formed with a flange 27 in the shape of a flat plate. Then, when the flat plate is wound and the flange portion 27 is bent outward, the flange portion 27 can be provided integrally with the nut 26. Since the nut 26 is a sheet metal molded body, a flange for attaching the nut 26 to the mating part can be easily formed. The flange portion 27 of the nut 26 is attached to a mating part that stops the rotation of the nut 26.
- Large and small diameter LZD can be made.
- the load ball rolling groove 2a is formed when the flat plate 8 is used. Therefore, the load ball rolling groove 2a can be easily formed even with a large LZD and a small diameter. it can.
- LZD a screw device that is strong against moment load can be obtained.
- the nut 2 is a sheet metal molded body, it is possible to integrally form notches, flanges, and the like.
- the ring 2 is molded with the seam of the nut 2 slightly opened, the nut 2 can be given elasticity, and the elastic nut 2 is press-fitted into a rough intersection hole. It can be used.
- the edge load (the ball 4 moves to the edge of the load ball rolling groove 2a and an excessive load is applied) can be reduced.
- FIGS. 16 to 18 show process diagrams of a method of manufacturing the screw device according to the second embodiment of the present invention.
- a one-turn groove 34 composed of a load ball rolling groove 32 and a return groove 33 is formed on a flat plate 31 by press drawing (see FIG. Groove forming step).
- a drawing die is used for the drawing process.
- the planar shape and the cross-sectional shape of the single turn groove 34 are the same as those of the single turn groove 9 shown in FIG.
- the single groove 34 is formed by press drawing, a convex shape can be formed on the back side of the flat plate 31.
- the manufacturing method of this embodiment since the one-turn groove 34 is pressed on the flat plate 31, the nut productivity can be increased.
- the flat plate is bent into a ring to form the nut 36 (nut forming step).
- a convex shape 37 is formed on the outer shape of the nut 36 by drawing.
- a housing 38 as a reinforcing member is formed on the outer diameter of the nut 36 by die casting or the like (reinforcing member forming step).
- a flange 39 is formed on the housing 38 in a body. Since the protrusion 37 is inserted into the die-cast housing 38 by the convex shape 37 of the nut outer shape, The axial separation of the nut 38 and the nut 36 can be prevented. This eliminates the need for stepping, retaining rings, grooves and the like to prevent the nut 36 and the housing 38 from coming off in the axial direction.
- the present invention is not limited to the above-described embodiment, and various modifications can be made without changing the gist of the present invention.
- the return groove is formed in the nut and the ball is circulated by the deflector method.
- a spacer may be interposed between the balls to prevent the balls from contacting each other! These spacers may be held in series by a belt-like member.
- the screw device of the present embodiment can be applied not only to an electric power steering device but also to a stage, a robot, a machine tool, and the like.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
- Slide Fasteners (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
- Emergency Lowering Means (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20060767807 EP1914447B1 (en) | 2005-07-29 | 2006-07-04 | Method of producing screw device, and screw device |
CN2006800261363A CN101248300B (zh) | 2005-07-29 | 2006-07-04 | 螺纹装置的制造方法以及螺纹装置 |
KR1020087004777A KR101276441B1 (ko) | 2005-07-29 | 2006-07-04 | 나사 장치의 제조 방법 및 나사 장치 |
US11/997,210 US8220353B2 (en) | 2005-07-29 | 2006-07-04 | Screw device manufacturing method and screw device |
JP2007528390A JP5060953B2 (ja) | 2005-07-29 | 2006-07-04 | ねじ装置の製造方法及びねじ装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-221071 | 2005-07-29 | ||
JP2005221071 | 2005-07-29 |
Publications (1)
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WO2007013266A1 true WO2007013266A1 (ja) | 2007-02-01 |
Family
ID=37683168
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/313276 WO2007013266A1 (ja) | 2005-07-29 | 2006-07-04 | ねじ装置の製造方法及びねじ装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US8220353B2 (ja) |
EP (1) | EP1914447B1 (ja) |
JP (1) | JP5060953B2 (ja) |
KR (1) | KR101276441B1 (ja) |
CN (1) | CN101248300B (ja) |
WO (1) | WO2007013266A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8950283B2 (en) | 2010-03-31 | 2015-02-10 | Nsk Ltd. | Method for manufacturing nut for ball screw and ball screw |
US9737926B2 (en) | 2010-03-17 | 2017-08-22 | Nsk Ltd. | Ball screw and manufacturing method of nut for ball screw |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101939566A (zh) * | 2008-02-06 | 2011-01-05 | Trw汽车美国有限责任公司 | 滚珠丝杠和螺母组件 |
JP5255503B2 (ja) * | 2009-03-31 | 2013-08-07 | Thk株式会社 | 転動体ねじ装置 |
WO2012017672A1 (ja) * | 2010-08-04 | 2012-02-09 | 日本精工株式会社 | ボールねじ用ナットの製造方法及びボールねじ |
US20130220047A1 (en) * | 2010-11-15 | 2013-08-29 | Nsk Ltd | Ball Screw |
DE102010053343A1 (de) * | 2010-12-03 | 2012-06-06 | August Steinmeyer Gmbh & Co. Kg | Umlenkleiste für einen Kugelgewindetrieb und Kugelgewindetrieb mit Umlenkleiste |
TWI444543B (zh) * | 2011-11-28 | 2014-07-11 | Hiwin Tech Corp | Internal recirculating ball screw |
FR2997326B1 (fr) * | 2012-10-30 | 2015-04-17 | Skf Ab | Procede de fabrication du filetage d'un ecrou de systeme vis ecrou et taraud par deformation associe |
JP5648727B1 (ja) * | 2013-09-19 | 2015-01-07 | 日本精工株式会社 | ボールねじ |
DE102014218405B3 (de) * | 2014-09-15 | 2015-11-05 | Schaeffler Technologies AG & Co. KG | Verfahren zur Herstellung einer Spindel für einen Kugelgewindetrieb, sowie eine danach hergestellte Spindel |
DE102014221135B3 (de) * | 2014-10-17 | 2016-01-07 | Schaeffler Technologies AG & Co. KG | Kugelgewindemutter |
JP6601792B2 (ja) * | 2015-09-24 | 2019-11-06 | Ntn株式会社 | ボールねじ |
DE102016209119B4 (de) * | 2016-05-25 | 2022-05-25 | Schaeffler Technologies AG & Co. KG | Spindelmutter, Gewindetrieb und Verfahren zur Herstellung einer Spindelmutter |
JP6408526B2 (ja) | 2016-08-23 | 2018-10-17 | 株式会社サンシン | ボールねじ研磨方法及びその装置 |
US11655885B2 (en) * | 2019-12-06 | 2023-05-23 | Pacific Bearing Corp. | Multiliner for multiple start ball nut threads |
PL3763970T3 (pl) * | 2020-03-25 | 2022-09-12 | SFS Group International AG | Śruba pociągowa, metalowa nakrętka i sposób wytwarzania metalowej nakrętki śruby pociągowej |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4950359A (ja) * | 1972-06-28 | 1974-05-16 | ||
JPS5646158A (en) * | 1979-09-13 | 1981-04-27 | Skf Nova Ab | Screw and nut mechanism |
JPH02199347A (ja) * | 1989-01-27 | 1990-08-07 | Paramaunto Bed Kk | ボールねじ及びボールねじ用ナット |
JP2005083549A (ja) * | 2003-09-11 | 2005-03-31 | Ntn Corp | ボールねじナットおよびその製造方法 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2581482A (en) * | 1948-02-27 | 1952-01-08 | Gen Motors Corp | Ball nut |
US3006212A (en) * | 1959-10-28 | 1961-10-31 | Gen Motors Corp | Stamped ball nut |
US3009367A (en) * | 1960-09-15 | 1961-11-21 | Lewis G Striggow | Ball nut cartridge |
US3455004A (en) * | 1967-01-06 | 1969-07-15 | Miroslaw R Tethal | Method of making a bearing structure |
DE3049138A1 (de) * | 1980-12-24 | 1982-07-15 | Ernst Leitz Wetzlar Gmbh, 6330 Wetzlar | Einrichtung zur fokussierung eines optischen systems |
JPS5852358U (ja) | 1981-10-07 | 1983-04-09 | 日本精工株式会社 | ボ−ルねじ |
US4612817A (en) * | 1983-06-29 | 1986-09-23 | Neff Gewindespindeln Gmbh | Circulating ball worm drive |
JP4230020B2 (ja) * | 1998-09-11 | 2009-02-25 | Thk株式会社 | ボールねじナット、該ボールねじナットを使用した直線案内装置及びステアリング用ボールねじ並びにボールねじナットの製造方法 |
US6192585B1 (en) * | 1998-11-04 | 2001-02-27 | Valeo Electrical Systems, Inc. | Ball nut and method of high volume manufacturing of same |
DE10028968A1 (de) | 2000-06-10 | 2001-12-13 | Schaeffler Waelzlager Ohg | Hülse für einen Gewindetrieb |
ATE310186T1 (de) * | 2001-07-13 | 2005-12-15 | Sonceboz Sa | Kugelumlaufspindelmutter |
WO2005026580A1 (ja) | 2003-09-11 | 2005-03-24 | Ntn Corporation | ボールねじナットおよびその製造方法 |
-
2006
- 2006-07-04 KR KR1020087004777A patent/KR101276441B1/ko active IP Right Grant
- 2006-07-04 JP JP2007528390A patent/JP5060953B2/ja active Active
- 2006-07-04 EP EP20060767807 patent/EP1914447B1/en active Active
- 2006-07-04 US US11/997,210 patent/US8220353B2/en active Active
- 2006-07-04 CN CN2006800261363A patent/CN101248300B/zh active Active
- 2006-07-04 WO PCT/JP2006/313276 patent/WO2007013266A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4950359A (ja) * | 1972-06-28 | 1974-05-16 | ||
JPS5646158A (en) * | 1979-09-13 | 1981-04-27 | Skf Nova Ab | Screw and nut mechanism |
JPH02199347A (ja) * | 1989-01-27 | 1990-08-07 | Paramaunto Bed Kk | ボールねじ及びボールねじ用ナット |
JP2005083549A (ja) * | 2003-09-11 | 2005-03-31 | Ntn Corp | ボールねじナットおよびその製造方法 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9737926B2 (en) | 2010-03-17 | 2017-08-22 | Nsk Ltd. | Ball screw and manufacturing method of nut for ball screw |
US8950283B2 (en) | 2010-03-31 | 2015-02-10 | Nsk Ltd. | Method for manufacturing nut for ball screw and ball screw |
Also Published As
Publication number | Publication date |
---|---|
EP1914447A4 (en) | 2011-03-16 |
JP5060953B2 (ja) | 2012-10-31 |
CN101248300B (zh) | 2010-08-11 |
KR101276441B1 (ko) | 2013-06-19 |
CN101248300A (zh) | 2008-08-20 |
JPWO2007013266A1 (ja) | 2009-02-05 |
KR20080034009A (ko) | 2008-04-17 |
US8220353B2 (en) | 2012-07-17 |
EP1914447A1 (en) | 2008-04-23 |
US20100101348A1 (en) | 2010-04-29 |
EP1914447B1 (en) | 2012-09-26 |
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