WO2007126025A1 - ローラねじ及びローラねじの無負荷ローラ戻し通路の設計方法 - Google Patents
ローラねじ及びローラねじの無負荷ローラ戻し通路の設計方法 Download PDFInfo
- Publication number
- WO2007126025A1 WO2007126025A1 PCT/JP2007/059116 JP2007059116W WO2007126025A1 WO 2007126025 A1 WO2007126025 A1 WO 2007126025A1 JP 2007059116 W JP2007059116 W JP 2007059116W WO 2007126025 A1 WO2007126025 A1 WO 2007126025A1
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- WIPO (PCT)
- Prior art keywords
- roller
- path
- load
- unloaded
- return passage
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
-
- 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
- F16H2025/2271—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers with means for guiding circulating rollers
-
- 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
- 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
-
- 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
- Y10T74/19781—Non-recirculating rolling elements
- Y10T74/19791—Cylindrical or quasi-cylindrical roller element [e.g., inclined roller, etc.]
Definitions
- the present invention relates to a roller screw in which a roller is interposed between a screw shaft and a nut so as to allow rolling motion, and a method for designing a no-load roller return path of the roller screw.
- a ball screw in which a ball is interposed between a screw shaft and a nut so as to allow rolling motion can reduce the coefficient of friction when rotating the screw shaft with respect to the nut. It is often used for a feed mechanism or an automobile steering gear.
- the roller screw has a screw shaft having a spiral roller rolling portion on the outer peripheral surface, a nut having a spiral load roller rolling portion facing the roller rolling portion of the screw shaft on the inner peripheral surface of the nut, A plurality of rollers interposed between the roller rolling portion of the screw shaft and the loaded roller rolling portion of the nut so as to be capable of rolling motion.
- the roller rolls between the screw shaft and the nut.
- the roller that has rolled to one end of the loaded roller rolling part of the nut is guided into a no-load roller return passage provided in the nut. Then, it returns to the other end of the loaded roller rolling path again via the no-load roller return path.
- the ball can roll in any direction in all directions.
- the force roller has only one rolling direction.
- the posture of the roller in the no-load roller return path at the connection between the no-load roller return path and the load roller rolling path It is necessary to match the posture of the roller in the loaded roller rolling path. From this request, as shown in FIGS. 18 and 19, the middle of the no-load roller return passage 51 is twisted, and the posture of the roller 52 is changed when moving the no-load roller return passage 51 (the center of the roller 52).
- Patent Document 1 Japanese Patent Laid-Open No. 11 210858
- the inventor sweeps the cross-section of the veg roller 53 in which the cross-sectional shape of the no-load roller return path is formed in a quadrangle similar to the cross-sectional shape of the roller 53, A passage was designed. Specifically, the movement trajectory of the central axis of the roller 53 in the no-load roller return path was designed in the shape of a belt-like surface, and the movement trajectory 54 in the shape of a belt-like surface was aimed. Then, the wall surface 55 of the unloaded roller return passage was designed by translating the movement locus 54 in the form of the belt-like surface by a distance obtained by adding a clearance to the roller diameter. Initially, it seemed that the roller 53 was accommodated in the unloaded roller return passage designed in this way with little play.
- the roller 53 interferes with the wall surface 55 of the no-load roller return path.
- the cause of the interference lies in the bulges 57 and 58 before and after the outline 56 of the cylindrical roller 53.
- roller screws have been developed, they have not yet been commercialized. In actual trial production, it is extremely difficult to move the rollers smoothly.
- the above-described conventional design method for the no-load roller return path is also considered to be a factor that hinders smooth circulation of the roller.
- an object of the present invention is to provide a new shape and shape of a no-load roller return path that can smoothly move a roller, and a new design method for a no-load roller return path of a roller screw. To do.
- the invention according to claim 1 is characterized in that a screw shaft (1) having a spiral roller rolling portion (la) on an outer peripheral surface and the roller rolling on an inner peripheral surface.
- a non-load roller return passage (10) having a spiral loaded roller rolling section (2a, 36a) facing the section (la) and connecting one end and the other end of the loaded roller rolling section (2a, 36a).
- a roller screw provided with a plurality of rollers (4) arranged in parallel so that the axes of adjacent rollers (4) are substantially parallel to a roller circulation path constituted by passages (10, 32)
- At least a part (10a, 32a) in the longitudinal direction of the no-load roller return path (10, 32) is moved when the roller (4) moves in the no-load roller return path (10, 32).
- the central axis (13) of the roller (4) is twisted so as to be inclined, and the cross-sectional shape of the twisted portion of the unloaded roller return passage (10, 32) is opposed to the side surface of the roller (4).
- Each of the pair of side surface corresponding parts (25c, 25d) is formed in a convex shape toward the inside of the no-load roller return path (10, 32).
- the invention according to claim 2 includes a screw shaft (1) having a spiral roller rolling portion (la) on an outer peripheral surface, and a spiral facing the roller rolling portion (la) on an inner peripheral surface. (2a, 36a) and a load roller rolling part (2a, 36a) and a nut (2 36), a loaded roller rolling path (9) between the roller rolling section (la) and the loaded roller rolling section (2a, 36a) and the no-load roller return path (10, 32).
- a roller screw having a plurality of rollers (4) arranged in parallel so that the axes of adjacent rollers (4) are kept substantially parallel to the roller circulation path formed, the unloaded roller return passage ( 10 and 32) at least part of the longitudinal direction (10a, 32a) force When the roller (4) moves through the no-load roller return passage (10, 32), the central axis (13) of the roller (4) Like tilting And a pair of end face corresponding portions (25a, 25b) facing the end face of the roller (4) according to the cross-sectional shape of the twisted portion of the unloaded roller return passage (10, 32). Is formed in a convex shape toward the outside of the no-load roller return passage (10, 32).
- the invention according to claim 3 is a screw shaft (1) having a spiral roller rolling part (la) on the outer peripheral surface.
- a spiral load roller rolling portion (2a, 36a) facing the roller rolling portion (la) on the inner peripheral surface, and one end and the other end of the load roller rolling portion (2a, 36a) No-load roller connecting the roller (10, 32) with a nut (2, 36), and the loaded roller rolling between the roller rolling section (la) and the loaded roller rolling section (2a, 36a).
- each of the pair of side surface corresponding parts (25c, 25d) facing the side surface of the roller (4) is formed in a convex shape by urging the inner side of the no-load roller return path (10, 32), and In the cross-sectional shape of the twisted portion of the no-load roller return path (10, 32), each of the pair of end face corresponding parts (25a, 25b) facing the end face of the roller (4) is the unload roller return path It is formed in a convex shape toward the outside of (10, 32).
- the invention according to claim 4 is the roller screw according to any one of claims 1 to 3, wherein the unloaded roller return passage (10, 32) connected to the loaded roller rolling passage (9).
- the cross-sectional shape of both ends is formed in a quadrangle similar to the cross-sectional shape along the central axis (13) of the roller (4).
- the invention according to claim 5 is the roller screw according to claim 4, wherein the both ends of the no-load roller return passage (10, 32) keep the roller (4) in the same posture. It is characterized by being moved along a straight track.
- the invention according to claim 6 is the roller screw according to any one of claims 1 to 5, wherein the unloaded roller return path (10, 32) is a roller (4) along a linear track.
- the straight path (10a, 32a) of (10, 32) is such that the central axis (13) of the roller (4) is inclined when the roller (4) moves in the straight path (10a, 32a).
- the direction change path (10b, 32b) of the unloaded roller return path (10, 32) is twisted when the roller (4) moves along the direction change path (10b, 32b).
- the center axis (13) of the roller (4) is twisted so as not to tilt, and is characterized in that
- the invention according to claim 7 includes a screw shaft (1) having a spiral roller rolling part (la) on an outer peripheral surface, and a spiral facing the roller rolling part (la) on an inner peripheral surface. (2a, 36a) and a load roller rolling part (2a, 36a) and a nut (2 36), a loaded roller rolling path (9) between the roller rolling section (la) and the loaded roller rolling section (2a, 36a) and the no-load roller return path (10, 32).
- the moving locus (20) of the central axis (13) of the recording roller (4) is designed in the shape of a belt-like surface, and at least a part of the moving locus (20) in the longitudinal direction of the belt-like surface shape is designed.
- the unloaded roller return path for designing the unloaded roller return path (10, 32) by moving the roller (4) along the twisted surface design process and the movement locus (20) in the shape of the band-shaped surface. And a design process.
- the invention according to claim 8 is the design method of the no-load roller return path of the roller screw according to claim 7, wherein the roller (4) actually used in the no-load roller return path design step. It is characterized in that a virtual roller (21) having a slightly larger diameter and height is used. The invention's effect
- the cross-sectional shape of the movement trajectory of the roller is such that the cross-sectional shape of the unloaded roller return passage is not a quadrangle similar to the cross-sectional shape along the central axis of the roller. become. Therefore, a no-load roller return path having a minimum clearance through which the roller can pass is obtained.
- the roller can be more smoothly transferred from the no-load roller return path to the load roller rolling path.
- the roller since the direction changing path for moving the roller along the curved path is twisted, the roller is inclined in the direction changing path. It can prevent the roller from moving badly.
- the cross-sectional shape of the unloaded roller rolling path is a cross-sectional shape of the movement trajectory of the roller that is not a quadrangle similar to the cross-sectional shape along the central axis of the roller. Can do.
- FIG. 1 is a perspective view of a roller screw according to a first embodiment of the present invention.
- FIG. 3 is a perspective view showing rollers arranged on a loaded roller rolling path.
- FIG. 5 Diagram showing a nut ((A) shows a front view, (B) shows a cross-sectional view, and (C) shows a rear view)
- FIG. 6 Diagram showing the trajectory of the center point of the roller ((A) in the figure shows the trajectory as seen from the axial direction of the screw shaft, and (B) shows the trajectory as seen from the side of the screw shaft. Indicate)
- FIG.8 Diagram showing a virtual roller moving along a movement trajectory
- FIG. 13 A diagram showing a cross-sectional shape of the no-load roller return passage (FIG. (A) shows an example of a rectangular shape, and FIG. (B) shows an example of an irregularly shaped quadrangle)
- FIG. 14 is a diagram showing a cross-sectional shape of a no-load roller return passage
- FIG. 15 is a view showing a nut of a roller screw in the second embodiment of the present invention.
- FIG. 19 is a view showing a conventional unloaded roller return path twisted by a roller screw.
- FIG. 20 is a view showing interference between the unloaded roller return path and a roller.
- roller rolling groove roller rolling part
- FIG. 1 and 2 show a roller screw according to an embodiment of the present invention.
- FIG. 1 shows a perspective view of a roller screw.
- the roller screw is opposed to the screw shaft 1 having a roller rolling groove la as a spiral roller rolling part formed on the outer peripheral surface and the roller rolling groove la on the inner peripheral surface.
- a nut 2 in which a loaded roller rolling groove 2a is formed as a spiral loaded roller rolling portion.
- a plurality of rollers 4 are arranged in the load roller-roller rolling path between the roller rolling groove la of the screw shaft 1 and the loaded roller rolling groove 2a of the nut 2.
- a retainer 5 is interposed between the rollers 4 to prevent the rollers 4 from contacting each other.
- Seals are attached to both ends of the nut 2 in the axial direction to prevent foreign matter adhering to the surface of the screw shaft 1 from entering the inside of the nut 2 and to prevent lubricant from leaking from the inside of the nut 2.
- Member 6 is attached.
- circulating members 7 and 8 are attached to the nut 2.
- a no-load roller return passage 10 is formed that connects one end and the other end of the loaded roller rolling groove 2 a of the nut 2.
- the plurality of rollers 4 roll and move along the load roller rolling path 9 between the single roller rolling groove la and the load roller rolling groove 2 a.
- the roller 4 that has rolled to one end of the loaded roller rolling path 9 passes through the no-load roller return path 10 of the circulating members 7 and 8, and then returns to the other end of the loaded roller rolling path 9 several turns before.
- the circulation members 7 and 8 include a straight path constituting member 7 and a pair of direction change path constituting members 8 provided at both ends of the straight path constituting member 7.
- a through hole 11 extending in parallel with the axis of the screw shaft 1 is formed in the nut 2, and a nove-shaped linear passage constituting member 7 is inserted into the through hole 11.
- a straight path 10a for moving the roller along a straight track is formed in the straight path constituting member 7.
- the straight passage 10a extends linearly in parallel with the axis of the screw shaft 1.
- Direction change path constituting members 8 are attached to both end faces of the nut 2 in the axial direction.
- the direction change path constituting member 8 is formed with a direction change path 10b for moving the roller along a curved line, for example, an arcuate path.
- the direction change path component 8 is divided into two parts, an outer peripheral side 8a and an inner peripheral side 8b of the arcuate track.
- Each of the outer peripheral side 8a and the inner peripheral side 8b of the direction change path constituting member 8 has a flange portion.
- the outer peripheral side 8a and the inner peripheral side 8b of the direction change path constituting member 8 are overlapped and positioned on the end surface of the nut 2, and the flange portion is fixed to the end surface of the nut 2 with fixing means such as bolts. Since both ends of the straight path constituting member 7 are fitted into the direction changing path constituting member 8, the straight path constituting member 7 is also fixed to the nut 2 by fixing the direction changing path constituting member 8 to the nut 2.
- FIG. 3 shows the rollers 4 a and 4 b arranged in the loaded roller rolling path 9.
- the nut 2 is seen through to show the rollers 4a and 4b arranged in the load roller rolling path.
- the roller screw This is a double thread.
- a spiral roller rolling groove la is formed on the outer peripheral surface of the screw shaft 1
- a helical load roller rolling groove 2 a is formed on the inner peripheral surface of the nut 2.
- Two sets of circulating members 7 and 8 are also attached to the nut 2 so as to be able to cope with the double thread.
- a roller 4 a that can load a load in one direction (1) in the axial direction of the screw shaft 1 is arranged.
- this load roller rolling path 9 a plurality of rollers 4a are arranged in parallel so that the axes of the adjacent rollers 4a are kept substantially parallel.
- the force shown is one roller 4a per turn.
- a plurality of rollers 4a are filled over the entire circumference of the loaded roller rolling path.
- Roller rolling paths 9 are arranged with rollers 4 b that can apply a load in the direction (2) opposite to the axial direction of the screw shaft 1.
- a plurality of rollers 4b are arranged in parallel so that the axis of the roller 4b adjacent to the loaded roller rolling path 9 is substantially parallel.
- the threader screw is a double thread so as to be able to apply loads in both directions of the axial direction of the screw shaft! /, The load in only one direction in the axial direction of the screw shaft If this is the case, the roller screw may be a single thread, or a triple thread may be used.
- the central axes 13a, 13b of the rollers 4a, 4b pass through the axis of the screw shaft 1 in the loaded roller rolling path. Even if the rollers 4a and 4b are located around the screw shaft 1, the central shafts 13a and 13b of the rollers 4a and 4b pass through the axis of the screw shaft 1. Thus, it is possible to prevent the rollers 4a and 4b from tilting and causing skew when the rollers 4a and 4b move on the load roller rolling path 9. Since the rollers 4a and 4b are arranged in the loaded roller rolling path 9 in such a posture, strictly speaking, the axes of adjacent rollers 4a or rollers 4b are not parallel. However, since the axes of adjacent rollers 4a or rollers 4b are almost parallel, it can be said that they are almost parallel.
- FIG. 4 shows the screw shaft 1.
- a spiral roller rolling groove la having a predetermined V-shaped cross section and having a substantially V-shaped cross section is formed.
- Roller 4a that can load (1) in the axial direction of screw shaft 1 is aligned in parallel with one roller rolling groove la, and the axial direction of screw shaft 1 is aligned with another roller rolling groove la.
- Rollers 4b that can apply a load in the opposite direction (2) are arranged in parallel.
- FIG. 5 shows the nut 2.
- the nut 2 is formed with a spiral loaded roller rolling groove 2a having a predetermined V-shaped section and facing the roller rolling groove la of the screw shaft 1 and having a substantially V-shaped cross section.
- the nut 2 is provided with a through hole 11 for inserting the linear passage constituting member 7.
- a recess 15 for mounting the direction change path component 8 is formed on the end face of the nut 2.
- the roller screw is a double thread, two sets of circulating members 7 and 8 are attached to the nut.
- Fig. 6 shows the movement locus of the center point of the roller moving along the loaded roller rolling path and the unloaded roller return path of one strip.
- 6 (A) shows the movement trajectory of the screw shaft 1 viewed from the axial direction
- FIG. 6 (B) shows the movement trajectory of the screw shaft 1 viewed from the side.
- the movement locus 16 of the center point of the roller 4 is the radius of the roller 4 in the shape of the spiral roller rolling groove la of the screw shaft 1 or the loaded roller rolling groove 2a of the nut 2.
- the movement locus 16 has a circular shape with a radius RCD / 2 when the axial force of the screw shaft 1 is also seen, and a spiral shape when the lateral force of the screw shaft 1 is seen.
- both ends of the movement locus 16 of the center point of the roller 4 in the loaded roller rolling path 9 are grasped, both ends of the movement locus 16 of the center point are extended in the tangential direction.
- the movement locus 17 of the center point of the roller 4 is a straight line parallel to the center line lb of the screw shaft 1.
- the movement trajectory 16 extending in the tangential direction and the movement trajectory 17 in the straight path 10a are connected by a curved line, for example, an arc having a radius of curvature R to obtain the movement trajectory 18 of the center point of the roller 4 in the direction change path 10b.
- the movement trajectories 17 and 18 of the center point of the roller 4 in the no-load roller return passage 10 can be designed into a line shape.
- the central axis 13 of the roller 4 is moved along the movement locus 16 to 18 of the center point of the line shape, and the movement locus 20 of the central axis 13 of the roller 4 is Design in the shape of a strip-shaped surface.
- Al and A5 are regions at both ends of the no-load roller return passage 10
- A2 and A4 are regions of the direction change passage 10b
- A3 is a region of the straight passage 10a.
- the roller 4 must be returned to the loaded roller rolling path 9 without being reversed. From these requests, At least a part in the longitudinal direction of the no-load roller return passage 10 is twisted so that the central axis of the roller 4 is inclined when moving in the no-load roller return passage 10.
- the straight passage 10a is twisted, and the central axis of the roller 4 is inclined by about 90 degrees at the inlet and outlet of the straight passage 10a. Therefore, in the region A3 of the straight passage 10a, the movement locus 20 of the central axis of the roller 4 is in the form of a twisted belt-like surface.
- the torsion rate of this straight passage 10a (ratio of the moving distance of the roller 4 and the inclination angle of the central axis of the roller 4) is constant.
- the movement locus 20 of the central axis of the roller 4 is not twisted. This is to prevent the movement of the roller 4 from deteriorating due to the inclination of the central axis of the roller 4 when the roller 4 is moved along the arcuate track.
- the movement locus 20 is formed by bending the belt along an arc.
- the areas A1 to A5 described above are the areas of the no-load roller return passage 10.
- the no-load porter return passage 10 is formed in the circulation members 7 and 8 attached to the nut 2.
- this unloaded roller return passage 10 there is a slight clearance around the roller 4, and the roller 4 moves by being pushed by the subsequent roller.
- the spiral region other than the regions A1 to A5 is the region of the load roller rolling path 9.
- the roller 4 is sandwiched between the roller rolling groove la of the screw shaft 1 and the load roller rolling groove 2a of the nut 2 and receives a load.
- the roller 4 rolls along with the relative rotation of the screw shaft 1 with respect to the nut 2 and moves in a spiral shape.
- the end of the load roller rolling path 9 is connected to the unloaded roller return path 10 from the loaded roller rolling path 9 or from the unloaded roller return path 10 to the loaded roller rolling path 9.
- a crowning may be provided in the loaded roller rolling groove 2a of the nut 2.
- the load roller rolling path 9 to the no-load port When moving to the roller return path, the load on the roller 4 is gradually released at the end of the load roller rolling path 9 and eventually the roller 4 may not receive the load.
- the portion where such a crowning is provided is also called a loaded roller rolling path 9.
- the no-load roller return passage 10 is designed by moving the virtual roller 21 along the movement locus 20 in the form of a band-like surface.
- the virtual roller 21 having a slightly larger diameter and height than the actually used roller 4 is used.
- the virtual roller 21 is moved along the movement locus 20 (more specifically, the central axis of the virtual roller 21 is orthogonal to the movement locus 17, 18 in the form of a line, and the central axis of the virtual roller 21 is twisted.
- the virtual roller 21 is moved little by little so as to be positioned in the belt-like plane). It can be seen that when the virtual roller 21 is moved (for example, moved from (1) to (2)), the central axis of the virtual roller 21 is inclined. Fig.
- FIG. 9 shows a set of virtual rollers 21 moved little by little.
- a swept curved surface 22 is obtained by moving a virtual roller 21 having a volume.
- a wall surface 23 of the no-load roller return path is created from the sweep curved surface 22 of FIG.
- FIG. 11 and FIG. 12 show the straight path 10a of the no-load roller return path 10 designed by the design method described above.
- the cross section of the straight passage 10a (more precisely, the cross section in the plane perpendicular to the movement locus 17 of the line of the center point of the roller 4) is cut, the cross sectional shape 24 is not a quadrangle. Become a shape.
- FIG. 13 shows a comparison between the cross-sectional shape of the conventional no-load roller return passage and the cross-sectional shape of the straight passage 10a of the no-load roller return passage 10 of the present embodiment.
- the cross-sectional shape of the conventional no-load roller return path is a quadrangle similar to the cross-sectional shape of the roller 4 along the center line of the roller 4 as shown in FIG. It was.
- the cross-sectional shape of the straight passage 10a of the no-load roller return passage 10 of the present embodiment is such that each of the pair of side surface corresponding portions 25c and 25d facing the side surface of the roller 4 It is formed in a convex shape with directing force to the side.
- the central portion 28 of the side surface corresponding portions 25c and 25d is the most concave, and the concave portion gradually becomes shallower from the central portion 28 toward the end portion 27 (left and right end portions in the figure).
- each of the pair of end surface corresponding portions 25a and 25b facing the end surface of the roller 4 is formed in a convex shape by force toward the outside of the unloaded roller return passage 10. More specifically, the center part 26 of the end face corresponding parts 25a, 25b is swelled most outward, and the center part 26 to the end part 27 ( In the figure, the swelling gradually decreases toward the upper and lower ends.
- the convex shapes of the end face corresponding portions 25a and 25b and the side face corresponding portions 25c and 25d may be formed of curves, or may be formed of a polygonal force combining a plurality of line segments.
- the cross-sectional shape of both ends of the unloaded roller return passage 10 (regions A1-1, A5-1-1 connected to the loaded roller rolling path 9) is a quadrangle similar to the cross-sectional shape along the central axis of the roller 4 Is formed.
- the sectional shape of the loaded roller rolling path 9 is the same quadrangle as the sectional shape along the central axis of the roller 4.
- FIG. 15 shows a nut of a roller screw in the second embodiment of the present invention.
- a return pipe type roller screw is used instead of the so-called end cap type roller screw.
- the present invention can also be applied to a return pipe type roller screw.
- the no-load roller return passage 32 is formed in the return pipe 33.
- the return nove 33 is composed of a main body part 34 in which the direction changing path 32b of the no-load roller return path 32 is formed, and a pair of legs 35 in which the straight path 32a is formed.
- the roller screw is a double thread similarly to the roller screw of the first embodiment.
- the return pipe 33 is also attached to the upper and lower portions of the nut 36. In this embodiment, the lower return pipe is omitted.
- the direction changing path 32b only moves the roller along the arcuate track, and is not twisted.
- the central axis of the roller always faces the horizontal direction.
- the cross-sectional shape of the direction change path 32b is formed in a quadrangle similar to the cross-sectional shape along the central axis of the roller.
- the straight passage 32a of the leg 35 is twisted. Do not reverse the roller through the no-load roller return path 32 (Do not change the direction of the load that the roller can receive) In order to return to the la rolling road, the twist angle of the pair of legs 35 must be 90 degrees in total.
- One leg 35 is twisted by about 10 degrees in order to match the posture of the roller in the load roller rolling groove 36a of the nut 36 with the posture in the direction change path 32b.
- the remaining legs 35 are twisted approximately 80 degrees in order to return to the loaded roller rolling groove 36a of the nut 36 without reversing the rollers in the direction change path 32b.
- FIG. 16 is a plan view of the nut
- FIG. 17 is a sectional view of the nut.
- the nut 36 is formed with a pair of through holes 37 extending to the load roller rolling groove 36a.
- the pair of leg portions 35 of the return pipe 33 are inserted into the pair of through holes 37.
- the end of the load roller rolling groove 36 a of the nut 36 ends in a horizontal plane parallel to the center line 36 b of the nut 36.
- the unloaded roller return passage 32 is designed as follows in the same manner as the end cap type roller screw. First, both ends of the spiral movement locus 38 of the center point of the roller on the loaded roller rolling path are extended in the tangential direction. Then, the movement trajectory 39 extended in the tangential direction and the arc-shaped movement trajectory of the center point of the roller in the direction switching path 32b are connected by a vertical line 40 (see FIG. 15). It is desirable to connect the movement locus 39 extended in the tangential direction as it is to the movement locus of the direction change path 32b. If the trajectory 39 is extended in the tangential direction, the vertical line 40 is provided when the leg 35 is broken.
- the central axis of the roller is moved along the movement trajectory 39, 40 in the form of a line, so that the movement trajectory of the central axis of the roller becomes the shape of a belt-like surface, and the shape of the belt-like surface Twist the trajectory in the leg 35.
- the unloaded roller return passage 32 is designed by moving the rollers along the movement locus in the form of a belt-like surface.
- the cross-sectional shape of the twisted straight passage is an irregular quadrangle as shown in FIG. 13 (B).
- the cross-sectional shape of the untwisted direction change path 32b and both ends is a quadrangle similar to the cross-sectional shape of the roller as shown in FIG. 13 (A).
- the roller may be a conical taper roller in addition to a cylindrical roller.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/298,849 US8336414B2 (en) | 2006-04-28 | 2007-04-26 | Roller screw and method of designing unloaded roller return path thereof |
EP07742551A EP2023011B1 (en) | 2006-04-28 | 2007-04-26 | Roller screw and method of designing unloaded roller return path for roller screw |
CN200780015452.5A CN101432549B (zh) | 2006-04-28 | 2007-04-26 | 滚柱丝杠及滚柱丝杠的无负载滚柱返回通路的设计方法 |
JP2008513276A JP4587408B2 (ja) | 2006-04-28 | 2007-04-26 | ローラねじ及びローラねじの無負荷ローラ戻し通路の設計方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006126613 | 2006-04-28 | ||
JP2006-126613 | 2006-04-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007126025A1 true WO2007126025A1 (ja) | 2007-11-08 |
Family
ID=38655549
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/059116 WO2007126025A1 (ja) | 2006-04-28 | 2007-04-26 | ローラねじ及びローラねじの無負荷ローラ戻し通路の設計方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US8336414B2 (ja) |
EP (1) | EP2023011B1 (ja) |
JP (1) | JP4587408B2 (ja) |
CN (1) | CN101432549B (ja) |
WO (1) | WO2007126025A1 (ja) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101232398B1 (ko) * | 2004-09-08 | 2013-02-12 | 티에치케이 가부시끼가이샤 | 롤러 나사 |
CN101874167B (zh) * | 2007-11-30 | 2014-01-08 | Thk株式会社 | 滚柱丝杠及滚柱丝杠中滚柱的循环方法 |
US8640564B2 (en) * | 2009-12-29 | 2014-02-04 | Hiwin Technologies Corp. | Circulation element for ball screw |
US8381607B2 (en) * | 2010-10-20 | 2013-02-26 | Hiwin Technologies Corp. | Roller screw |
DE102016204133A1 (de) * | 2016-03-14 | 2017-09-14 | Zf Friedrichshafen Ag | Linearer Stellantrieb |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3192791A (en) * | 1962-06-07 | 1965-07-06 | Textron Inc | Antifriction screw and nut assembly |
JPS5031257A (ja) * | 1973-05-16 | 1975-03-27 | ||
JPH0320753U (ja) * | 1989-07-11 | 1991-02-28 | ||
JPH11210858A (ja) | 1998-01-19 | 1999-08-03 | Koyo Mach Ind Co Ltd | 循環式ねじ装置 |
JP2006126613A (ja) | 2004-10-29 | 2006-05-18 | Fujitsu Ltd | 撮像装置及び電子部品の基板実装装置 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2259325A (en) * | 1939-12-23 | 1941-10-14 | Thomas L Robinson | Roller bearing |
GB1085086A (en) * | 1965-03-24 | 1967-09-27 | Textron Inc | Antifriction screw and nut assembly |
FR2271442B1 (ja) * | 1974-05-17 | 1977-10-21 | Pitner Alfred | |
ES8607502A1 (es) * | 1985-07-08 | 1986-06-16 | Ercilla Sagarminaga Maria | Mejoras introducidas en husillos sin-fin para transmision demovimiento |
US5529402A (en) * | 1994-10-26 | 1996-06-25 | The Torrington Company | Tapered drawn cup needle bearing |
US5902022A (en) * | 1996-06-28 | 1999-05-11 | The Torrington Company | Controlled contact stress roller bearing |
JP4722703B2 (ja) | 2003-09-10 | 2011-07-13 | Thk株式会社 | ローラねじ |
KR101232398B1 (ko) * | 2004-09-08 | 2013-02-12 | 티에치케이 가부시끼가이샤 | 롤러 나사 |
-
2007
- 2007-04-26 WO PCT/JP2007/059116 patent/WO2007126025A1/ja active Application Filing
- 2007-04-26 CN CN200780015452.5A patent/CN101432549B/zh active Active
- 2007-04-26 JP JP2008513276A patent/JP4587408B2/ja active Active
- 2007-04-26 US US12/298,849 patent/US8336414B2/en active Active
- 2007-04-26 EP EP07742551A patent/EP2023011B1/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3192791A (en) * | 1962-06-07 | 1965-07-06 | Textron Inc | Antifriction screw and nut assembly |
JPS5031257A (ja) * | 1973-05-16 | 1975-03-27 | ||
JPH0320753U (ja) * | 1989-07-11 | 1991-02-28 | ||
JPH11210858A (ja) | 1998-01-19 | 1999-08-03 | Koyo Mach Ind Co Ltd | 循環式ねじ装置 |
JP2006126613A (ja) | 2004-10-29 | 2006-05-18 | Fujitsu Ltd | 撮像装置及び電子部品の基板実装装置 |
Non-Patent Citations (1)
Title |
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See also references of EP2023011A4 |
Also Published As
Publication number | Publication date |
---|---|
EP2023011A1 (en) | 2009-02-11 |
JPWO2007126025A1 (ja) | 2009-09-10 |
EP2023011A4 (en) | 2010-01-27 |
JP4587408B2 (ja) | 2010-11-24 |
US8336414B2 (en) | 2012-12-25 |
EP2023011B1 (en) | 2011-09-28 |
CN101432549B (zh) | 2011-05-25 |
CN101432549A (zh) | 2009-05-13 |
US20090070078A1 (en) | 2009-03-12 |
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