WO2023188058A1 - Dispositif de vis à billes - Google Patents

Dispositif de vis à billes Download PDF

Info

Publication number
WO2023188058A1
WO2023188058A1 PCT/JP2022/015786 JP2022015786W WO2023188058A1 WO 2023188058 A1 WO2023188058 A1 WO 2023188058A1 JP 2022015786 W JP2022015786 W JP 2022015786W WO 2023188058 A1 WO2023188058 A1 WO 2023188058A1
Authority
WO
WIPO (PCT)
Prior art keywords
nut
circulation
circulation path
inner diameter
passage
Prior art date
Application number
PCT/JP2022/015786
Other languages
English (en)
Japanese (ja)
Inventor
明義 田代
Original Assignee
株式会社ジェイテクト
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社ジェイテクト filed Critical 株式会社ジェイテクト
Priority to PCT/JP2022/015786 priority Critical patent/WO2023188058A1/fr
Publication of WO2023188058A1 publication Critical patent/WO2023188058A1/fr

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
    • F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
    • F16H25/2214—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls with elements for guiding the circulating balls
    • 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
    • F16H25/22—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
    • F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts

Definitions

  • the present invention relates to a ball screw device.
  • Patent Document 1 describes a screw shaft having a first helical groove formed on its outer periphery, a nut having a second helical groove formed on its inner periphery, and a threaded shaft having a first helical groove formed between the first helical groove and the second helical groove.
  • a ball screw device is disclosed that includes a plurality of balls arranged on a rolling path.
  • the nut includes a cylindrical nut body and circulation members attached to both sides of the nut body in the axial direction.
  • a through hole passing through the nut body in the axial direction is formed.
  • a passage is formed in the circulation member between the side surface and the inner peripheral surface thereof.
  • the ball circulation path is formed across different members, the nut body and the circulation member. When joining different parts, they may be misaligned within the tolerance (allowable error), and the circulation path (through hole) on the nut body side and the circulation path (passage) on the circulation member side may also be slightly misaligned. There is a possibility of misalignment.
  • the inside diameter of the circulation path is set to be a predetermined dimension that takes into account the above tolerances from the outside diameter of the ball. is also formed large.
  • the present disclosure aims to move balls smoothly in the circulation path of a ball screw device.
  • the ball screw device of the present disclosure includes a screw shaft in which a first spiral groove is formed on the outer periphery; a nut having a second spiral groove formed on its inner periphery; A plurality of balls arranged in a rolling path formed between the first spiral groove and the second spiral groove,
  • the nut includes one or more nut components, A circulation path for circulating the ball between one end and the other end of the rolling path is formed in the nut component, In the nut component, the inner diameter of the end portion in the longitudinal direction of the circulation path is larger than the inner diameter of the intermediate portion in the longitudinal direction.
  • the balls can be smoothly moved in the circulation path of the ball screw device.
  • FIG. 1 is a perspective view of a ball screw device according to a first embodiment.
  • FIG. 2 is a sectional view of the ball screw device shown in FIG. 1.
  • FIG. It is a perspective view of a nut main body and a retaining ring.
  • It is a perspective view of a circulation member. It is an exploded perspective view of one circulation member.
  • 3 is a cross-sectional view taken along the line VI-VI in FIG. 2.
  • FIG. It is a schematic cross-sectional explanatory view showing a circulation path.
  • It is a perspective view of the ball screw device concerning a 2nd embodiment.
  • It is a perspective view of the ball screw device concerning a 3rd embodiment.
  • It is an explanatory view showing arrangement of a plurality of balls passing through a circulation path.
  • the ball screw device of the present disclosure includes a screw shaft in which a first spiral groove is formed on the outer periphery; a nut having a second spiral groove formed on its inner periphery; A plurality of balls arranged in a rolling path formed between the first spiral groove and the second spiral groove,
  • the nut includes one or more nut components, A circulation path for circulating the ball between one end and the other end of the rolling path is formed in the nut component, In the nut component, the inner diameter of the end portion in the longitudinal direction of the circulation path is larger than the inner diameter of the intermediate portion in the longitudinal direction.
  • the nut component and the circulation path adjacent to the nut component are Even if the other member having the ball passage communicating with the ball is misaligned within the tolerance range, the ball can pass between the two members.
  • the staggered angle (the angle ⁇ shown in FIG. 11) of the plurality of balls at the intermediate portion in the longitudinal direction can be made small, so that the balls can move smoothly in the circulation path.
  • an inner diameter at both ends of the circulation path in the longitudinal direction is larger than an inner diameter at an intermediate portion in the longitudinal direction.
  • the inner diameter of one end in the longitudinal direction of the circulation path is different from the inner diameter of the other end.
  • the inner diameter of the part can be appropriately set.
  • the nut includes a first nut component and a second nut component disposed adjacent to the first nut component,
  • the circulation path includes a first circulation path formed in the first nut component and a second circulation path formed in the second nut component and communicating with the first circulation path.
  • the inner diameters of mutually adjacent ends of the first circulation path and the second circulation path are the same. According to this configuration, while allowing the balls to pass between the plurality of nut constituent members that make up the nut, the staggered angle of the plurality of balls is reduced in the circulation path of each nut constituent member, and the movement of the balls is smoothed. be able to.
  • one or more of the nut constituent members are composed of a plurality of members arranged on top of each other, and the circulation path of the nut constituent member is formed between the plurality of members. . According to this configuration, it is not necessary to use a drill or the like to form the circulation path, and the circulation path can be easily formed.
  • FIG. 1 is a perspective view of a ball screw device according to a first embodiment.
  • FIG. 2 is a sectional view of the ball screw device shown in FIG. 1.
  • the ball screw device 10 of this embodiment includes a screw shaft 11, a nut 12, and a plurality of balls 13.
  • the nut 12 is formed into a cylindrical shape.
  • the nut 12 includes a nut body 15 and a pair of circulation members 16 and 17.
  • a pair of circulation members 16 and 17 are attached to both sides of the nut body 15 in the axial direction.
  • the center line C of the screw shaft 11 and the center line of the nut 12 coincide. This center line C is also the center line of the ball screw device 10.
  • the screw shaft 11 is connected to a drive device such as a motor (not shown), and is driven to rotate around its own center line C by the drive device.
  • a drive device such as a motor (not shown)
  • the nut 12 moves in one axial direction
  • the screw shaft 11 rotates in the other direction (reverse rotation)
  • the nut 12 moves in the other axial direction.
  • the direction along the center line C is defined as the "axial direction.” This axial direction also includes a direction parallel to the center line C. In the present disclosure, a direction perpendicular to the center line C is defined as a "radial direction.” Furthermore, in the present disclosure, a direction along a circle centered on the center line C is defined as a "circumferential direction.”
  • the ball screw device 10 of this embodiment is applied to, for example, a brake device of an automobile, particularly an electric booster.
  • a brake device of an automobile, particularly an electric booster.
  • an output shaft (not shown) of a drive device (output shaft of a motor) is connected to one axial side of the screw shaft 11 .
  • a member (moving member) connected to a piston included in the brake device is arranged on the other axial side of the screw shaft 11, for example.
  • the brake device moves the nut 12 to the other side in the axial direction by rotating the screw shaft 11, thereby pushing the moved member to the other side in the axial direction, thereby generating a braking force.
  • the ball screw device 10 of the present disclosure is also applicable to devices other than brake devices.
  • the screw shaft 11 is a cylindrical member, and a single first spiral groove 21 is formed on its outer periphery.
  • the nut 12 includes the nut body 15 and the two circulation members 16 and 17.
  • the nut body 15 has a generally cylindrical shape, and has a second helical groove 22 formed on its inner periphery.
  • the second spiral groove 22 is formed with the same pitch and the same number of threads as the first spiral groove 21.
  • the first helical groove 21 and the second helical groove 22 can face each other in the radial direction, and a rolling path 23 is formed between the first helical groove 21 and the second helical groove 22 as a helical passage.
  • a plurality of balls 13 are arranged on the rolling path 23. As the screw shaft 11 rotates, the balls 13 move while rolling on the raceway 23. Since the load from the ball 13 acts on the first helical groove 21 and the second helical groove 22, the nut body 15 and the screw shaft 11 are heat-treated products that have been heat-treated to obtain desired hardness. Specifically, the nut body 15 and the screw shaft 11 are hardened (carburized and tempered) and tempered. Note that the number of first spiral grooves 21 and second spiral grooves 22 may be plural.
  • FIG. 3 is a perspective view of the nut body and the retaining ring.
  • the nut main body 15 has a cylindrical central cylindrical portion 30, a substantially cylindrical first end cylindrical portion 31, and a substantially cylindrical second end cylindrical portion 32.
  • the central tube portion 30, the first end tube portion 31, and the second end tube portion 32 are made of metal such as steel and are integrally formed.
  • the first end tube portion 31 and the second end tube portion 32 have the same outer diameter as the center tube portion 30.
  • the first end tube portion 31 and the second end tube portion 32 have a larger inner diameter than the center tube portion 30.
  • a second helical groove 22 is formed on the inner circumferential surface of the central cylindrical portion 30 of the nut body 15 .
  • the outer peripheral surface of the nut body 15 includes a cylindrical portion 15a formed as a cylindrical surface and a flat portion 15b formed as a flat surface.
  • the cylindrical portion 15a occupies more than half of the outer peripheral surface of the nut body 15, and the flat portion 15b occupies the remaining portion. Therefore, the nut body 15 is formed into a substantially D shape when viewed in the axial direction.
  • the first end tube portion 31 and the second end tube portion 32 are continuous in the circumferential direction within the cylindrical portion 15a, but are separated at the flat portion 15b. Therefore, the first end tube portion 31 and the second end tube portion 32 have notches 31b and 32b in a portion in the circumferential direction. Therefore, the first end tube portion 31 and the second end tube portion 32 are formed in a C-shape when viewed in the axial direction.
  • the central cylindrical portion 30 has a first end surface 34 facing one side in the axial direction and a second end surface 35 facing the other side in the axial direction.
  • the first end surface 34 and the second end surface 35 are annular surfaces, and are perpendicular to the center line C.
  • the first end cylindrical portion 31 surrounds the first end surface 34 from the outside in the radial direction, and is provided so as to extend from the outer peripheral side of the central cylindrical portion 30 to one side in the axial direction (the right side in FIG. 2).
  • the second end tube portion 32 surrounds the second end surface 35 from the outside in the radial direction, and is provided so as to extend from the outer peripheral side portion of the center tube portion 30 to the other side in the axial direction (left side in FIG. 2).
  • the inner circumferential surface 31a of the first end tube portion 31 is a substantially cylindrical surface, and a circumferential groove 41 is formed in a part of the inner circumferential surface 31a.
  • the inner circumferential surface 32a of the second end tube portion 32 is a substantially cylindrical surface, and a circumferential groove 42 is formed in a part of the inner circumferential surface 32a.
  • the inner circumferential surfaces 31a and 32a are each cylindrical surfaces centered on the center line C.
  • FIG. 4 is a perspective view of the circulation member.
  • FIG. 5 is an exploded perspective view of one circulation member.
  • the circulation member includes a first circulation member 16 and a second circulation member 17.
  • the first circulation member 16 has an annular portion 61 and a protrusion 62 .
  • the annular portion 61 is formed in an annular shape.
  • the protruding portion 62 protrudes radially outward from a portion of the annular portion 61 in the circumferential direction.
  • the annular portion 61 is inserted into the radially inner side of the first end cylindrical portion 31 of the nut body 15 and is in contact with the first end surface 34 of the central cylindrical portion 30 .
  • the protruding portion 62 is arranged in the notch portion 31b of the first end tube portion 31.
  • the circumferential width w2 (see FIG. 4) of the protrusion 62 is slightly smaller than the circumferential width w1 (see FIG. 3) of the notch 31b.
  • the end surfaces 62c on both sides in the circumferential direction of the protrusion 62 face the end surfaces 31c of the first end cylinder portion 31 on both sides in the circumferential direction of the notch portion 31b.
  • the protrusion 62 is arranged in the notch 31b, and the end surfaces 62c on both sides in the circumferential direction of the protrusion 62 contact the end surfaces 31c of the first end cylinder part 31 on both sides in the circumferential direction of the notch 31b, so that the nut body
  • the first circulation member 16 is positioned relative to the first circulation member 15 in the circumferential direction.
  • the ball screw device 10 further includes a retaining ring 18 that fits into a first circumferential groove 41 formed on the inner periphery of the first end tube portion 31.
  • the retaining ring 18 sandwiches the first circulation member 16 between itself and the first end surface 34, and positions and fixes the first circulation member 16.
  • the retaining ring 18 is a C-shaped retaining ring.
  • the first circulation member 16 is made of synthetic resin.
  • the first circulation member 16 is manufactured by injection molding.
  • the first circulation member 16 of this embodiment is composed of two resin molded products 51 and 52 that can be divided in the axial direction.
  • a recess 53 having a shape that follows the outer shape of the other resin molded product 52 is formed on the side of one resin molded product 51, and in this recess 53, the other resin molded product 52 By being fitted, both the resin molded products 51 and 52 are combined, and the first circulation member 16 is constructed.
  • the recessed portion 53 of one resin molded product 51 is provided with an enlarged portion 53a that is expanded radially outward, and the other resin molded product 52 is is provided with a protrusion 52a that protrudes in the radial direction.
  • a first passage 36 is formed in the first circulation member 16.
  • the first passage 36 is constituted by a groove and a hole formed between the side surface 45 on the other axial side of the first circulation member 16 and the inner circumferential surface 46 .
  • one end of the first passage 36 is open at a side surface 45 on the other axial side of the first circulation member 16 .
  • the other end of the first passage 36 is open at the inner circumferential surface 46 of the first circulation member 16 .
  • the first passage 36 is formed by overlapping a groove 54a formed in one resin molded product 51 and a groove 54b formed in the other resin molded product 52.
  • the second circulation member 17 includes an annular portion 61, a protrusion 62, and a covering portion 63.
  • the annular portion 61 is formed in an annular shape.
  • the protruding portion 62 protrudes radially outward from a portion of the annular portion 61 in the circumferential direction.
  • the annular portion 61 and the protruding portion 62 of the second circulating member 17 have the same configuration as the annular portion 61 and the protruding portion 62 of the first circulating member 16, but are arranged with the axial directions reversed.
  • the annular portion 61 is inserted into the radially inner side of the second end cylindrical portion 32 of the nut body 15 and is in contact with the second end surface 35 of the central cylindrical portion 30 .
  • the protruding portion 62 is arranged in the notch portion 32b of the second end tube portion 32.
  • the circumferential width w2 (see FIG. 4) of the protrusion 62 is slightly smaller than the circumferential width w1 (see FIG. 3) of the notch 32b.
  • the end surfaces 62c on both sides in the circumferential direction of the protruding portion 62 face the end surfaces 32c of the second end tube portion 32 on both sides in the circumferential direction of the notch portion 32b.
  • the protrusion 62 is arranged in the notch 32b, and the end surfaces 62c on both sides in the circumferential direction of the protrusion 62 contact the end surfaces 32c of the second end cylinder part 32 on both sides in the circumferential direction of the notch 32b, so that the nut body
  • the second circulation member 17 is positioned relative to the second circulation member 15 in the circumferential direction.
  • the ball screw device 10 further includes a retaining ring 18 that fits into a circumferential groove 42 formed on the inner periphery of the second end cylinder portion 32.
  • the retaining ring 18 sandwiches the annular portion 61 of the second circulation member 17 between itself and the second end surface 35, thereby positioning and fixing the second circulation member 17.
  • the retaining ring 18 has the same configuration as the retaining ring 18 for fixing the first circulation member 16 to the nut body 15.
  • the second circulation member 17 is made of synthetic resin.
  • the second circulation member 17, like the first circulation member 16, is formed of two resin molded products 51 and 52 (see FIG. 5) that can be divided in the axial direction.
  • a second passage 37 is formed in the second circulation member 17.
  • the second passage 37 is constituted by a groove and a hole that are formed between the side surface 45 on one axial side of the second circulation member 17 and the inner circumferential surface 46 .
  • one end of the second passage 37 is open at a side surface 45 on one axial side of the second circulation member 17 .
  • the other end of the second passage 37 is open at the inner circumferential surface 46 of the second circulation member 17 .
  • the second passage 37 is configured by a groove 54a formed in one resin molded product 51 and a groove 54b formed in the other resin molded product 52, similarly to the first passage 36 explained using FIG. There is.
  • FIG. 6 is a sectional view taken along line VI-VI in FIG. 2.
  • the covering portion 63 of the second circulation member 17 extends in the axial direction from the tip of the protruding portion 62 toward one side in the axial direction.
  • a radially outer surface (outer peripheral surface) 63b of the covering portion 63 is formed in an arc shape.
  • a radial inner surface 63c of the covering portion 63 is formed into a flat surface. The radially inner surface 63c of the covering portion 63 overlaps the flat portion 15b of the outer circumferential surface of the nut body 15, and covers the flat portion 15b.
  • a groove 63a extending linearly in the axial direction is formed on the radially inner surface 63c of the covering portion 63.
  • This groove 63a is closed from the inside in the radial direction by the flat portion 15b of the central cylinder portion 30. Therefore, a hole surrounded by the groove 63a and the flat portion 15b is formed in the nut 12, and this hole constitutes a passage (third passage) 33 through which the ball 13 passes. Therefore, the covering portion 63 of the second circulation member 17 functions as a passage forming member for forming the third passage 33 through which the ball 13 passes.
  • the groove width and groove depth of the groove 63a are approximately the same, and are slightly larger than the outer diameter of the ball 13. In this embodiment, the groove width and groove depth of the groove 63a are referred to as the inner diameter of the third passage 33.
  • One end of the third passage 33 communicates with one end of the first passage 36, and the other end of the third passage 33 communicates with one end of the second passage 37.
  • the first passage 36, the third passage 33, and the second passage 37 constitute a circulation path 38 for the nut 12. Balls 13 are also arranged in the circulation path 38.
  • the balls 13 of the raceway 23 roll on the raceway 23 (the first spiral groove 21 and the second spiral groove 22), apply an axial force to the nut 12, and move the nut 12 in the axial direction. move it to The ball 13 can pass through the circulation path 38 from one end of the rolling path 23 and return to the other end of the rolling path 23. That is, the ball 13 can circulate through the rolling path 23 and the circulation path 38.
  • the third passage 33 is formed by two members: the covering portion 63 of the second circulation member 17 and the central cylindrical portion 30 of the nut body 15. Therefore, it is not necessary to form the third passage 33 on one member (the nut body 15) using a cutting tool such as an elongated drill as in the conventional case, and the third passage 33 can be easily formed.
  • the groove 63a is formed in the covering portion 63 of the second circulation member 17 made of synthetic resin, the groove 63a may also be formed when molding the second circulation member 17. This allows the third passage 33 to be formed more easily. Further, since no groove is formed in the metal nut body 15, and the groove 63a is simply closed by the flat portion 15b, machining or the like for forming the through hole is not required. . This allows the through-hole to be formed more easily.
  • the groove forming the third passage 33 may be formed in the flat portion 15b of the nut body 15, or may be formed in both the inner surface 63c of the covering portion 63 and the flat portion 15b of the nut body 15. You can leave it there.
  • the covering portion 63 is provided on one of the first and second circulation members 16 and 17, so that it can be used even when the screw shaft 11 and the second circulation member 17 are attached to the nut body 15. , most of the balls 13 are inserted into the spiral groove, the second passage 37 and the third passage 33, and then the remaining balls 13 are inserted into the first passage 36 of the first circulation member 16 while the first circulation member 16 is By attaching it to the nut body 15, the ball screw device 10 can be easily assembled.
  • FIG. 11 is an explanatory diagram showing the arrangement of a plurality of balls passing through the circulation path.
  • the circulation path 33 becomes larger.
  • , 36, 37 are arranged in a staggered manner, and the angle (staggered angle) ⁇ between the virtual lines La and Lb connecting the centers of one ball 13 and two adjacent balls 13 is large. Become. As the staggered angle ⁇ increases, it becomes difficult for the balls to pass smoothly through the circulation paths 33, 36, and 37. Therefore, it is preferable that the gaps between the ball 13 and the circulation paths 33, 36, and 37 be small.
  • the circulation paths 33, 36, and 37 are formed across a plurality of members.
  • the first passage 36 of the circulation path is formed in the first circulation member 16
  • the second passage 37 is formed in the second circulation member 17
  • the third passage 33 is formed in the nut body 15 and the passage forming member (the 2) is formed on the covering portion 63 of the circulation member 17. Therefore, when the ball 13 circulates through the circulation paths 33, 36, and 37, it passes through the boundaries of the plurality of members.
  • each member which constitutes the nut 12 and in which the circulation paths 36, 37, and 33 are formed is also referred to as a nut constituent member.
  • FIG. 7 is a schematic cross-sectional view showing the circulation path.
  • FIG. 7 in order to generalize and demonstrate the structure of a nut and a circulation path, it demonstrates using a different code
  • FIG. 7 a first nut component A (for example, the first circulation member 16 of the above embodiment) and a second nut component B adjacent to the first nut component A (for example, the first circulation member 16 of the above embodiment) are shown.
  • a first circulation path a and a second circulation path b (for example, the first passage 36 and the third passage 33 in the above embodiment) through which the ball E passes are formed in the nut body 15 and the passage forming member 63).
  • the inner diameters D1, D2, D2' of the longitudinal ends a1, a2, b1, b2 of each circulation path a, b are the inner diameter D3 of the longitudinal intermediate portions a3, b3 of each circulation path a, b. is set larger than .
  • Each of the inner diameters D1, D2, D2', and D3 is larger than the outer diameter of the ball 13.
  • Each circulation path a, b is formed into a substantially conical shape so that the inner diameter gradually changes between the longitudinal ends a1, a2, b1, b2 and the intermediate portions a3, b3.
  • the inner diameter D1 of the end a1 on the second nut component B side of the first circulation path a formed in the first nut component A, and the second circulation path formed in the second nut component B The inner diameter D1 of the end b1 of the path b on the first nut component A side is the same.
  • the inner diameter D1 of one end a1, b1 in the longitudinal direction and the inner diameter D2, D2' of the other end a2, b2 may be the same or different.
  • the inner diameter D2 of the other end a2 of the first circulation path a and the inner diameter D2' of the other end b2 of the second circulation path b may be the same or different.
  • the inner diameters D2 and D2' of the other ends a2 and b2 of each of the circulation paths a and b are respectively the same as those of other members (other nut members and members having the rolling path 23) adjacent to the first nut member A. Setting (for example, the inner diameter of these ).
  • the inner diameter D1 of the first circulation path a and the inner diameter D1 of the second circulation path b are set as follows.
  • the inner diameter D1 is determined even if the first nut component A and the second nut component B are maximally misaligned in the direction along their contact surfaces (vertical direction in FIG. 7) within the tolerance range.
  • the amount of overlap between the end a1 of the first circulation path a and the end b1 of the second circulation path b is set to be larger than the outer diameter of the ball E. Therefore, even if the first nut component A and the second nut component B are vertically misaligned within the tolerance range, the ball E can pass between both nut components A and B.
  • the staggered angle ⁇ (see FIG. 11) of the plurality of balls E is made smaller. , the ball E can be moved smoothly within the circulation paths a and b. Therefore, the generation of noise and vibration caused by the movement of the ball E can be suppressed.
  • the inner diameter D2 of the first circulation path a and the inner diameter D2' of the second circulation path b are set as follows.
  • the inner diameters D2 and D2' are determined so that the first nut component A, the second nut component B, and other members adjacent thereto are in a direction along their contact surfaces within the range of tolerance (Fig. 7), the amount of overlap between the ends a2 and b2 of the first and second circulation paths a and b and the passages of other members is larger than the outer diameter of the ball E. is set to be larger. Therefore, even if the first and second nut constituent members A, B and another member adjacent thereto are misaligned within the tolerance range, the ball E can pass between the two members.
  • FIG. 8 is a perspective view of a ball screw device according to the second embodiment.
  • a covering portion (passage forming member) 63 is provided on both the first circulation member 16 and the second circulation member 17 that constitute the nut 12 of the ball screw device 10.
  • the covering portion 63 of the first circulation member 16 extends to the axial center of the central cylindrical portion 30 of the nut body 15, and the covering portion 63 of the second circulation member 17 also extends to the axial center of the central cylindrical portion 30.
  • the distal end surface of the covering section 63 of the first circulating member 16 and the distal end surface of the covering section 63 of the second circulating member 17 are arranged to face each other and either come into contact with each other or leave a small gap therebetween.
  • a groove 63a (see FIG. 6) for forming the third passage 33 is formed in both the covering parts 63, as in the first embodiment.
  • first and second circulation members 16 and 17 have the covering portions 63 of the same length, the same parts can be used by being reversed in the axial direction. Therefore, the types of parts that constitute the ball screw device 10 can be reduced.
  • the covering portions 63 formed on the first and second circulation members 16 and 17 may have different lengths.
  • the inner diameter of the circulation path has the relationship as explained with reference to FIG. 7, and has the effects described in the same explanation.
  • FIG. 9 is a perspective view of a ball screw device according to a third embodiment.
  • the nut 12 includes a nut main body 15, first and second circulation members 16 and 17, and a covering member 64.
  • the configurations of the nut body 15 and the first circulation member 16 are the same as in the first embodiment.
  • the second circulation member 17 does not have the covering portion 63.
  • the covering member 64 corresponds to the covering portion 63 of the second circulation member 17 in the first embodiment.
  • the covering member 64 of this embodiment corresponds to the covering part 63 when the annular part 61 and the protruding part 62 of the second circulation member 17 of the first embodiment are separated from the covering part 63.
  • the covering member 64 is fixed to the nut body 15 or the first and second circulation members 16 and 17 using a fixing device such as a screw, for example.
  • the covering member 64 has a concave groove 63a that is closed by the flat part 15b of the central cylindrical part 30 in the nut body 15, and forms a third passage 33 between the covering member 64 and the flat part 15b. Functions as a forming member. Therefore, this embodiment also has the same effects as the first embodiment. Further, in this embodiment, the same parts can be used as the first and second circulation members 16 and 17.
  • the inner diameter of the circulation path has the relationship as explained with reference to FIG. 7, and has the effects described in the same explanation.
  • FIG. 10 is a perspective view of a ball screw device according to a fourth embodiment.
  • the nut 12 includes a nut body 15 and a circulation member 19.
  • the nut body 15 is formed in a cylindrical shape and has a second spiral groove 22 on the inner periphery.
  • the circulation member 19 forms a circulation path 19a for the balls 13, and is formed in a tubular shape.
  • the circulation member 19 is bent into a substantially U-shape. Both ends of the circulation member 19 are inserted into holes formed in the nut body 15. Both ends of the circulation member 19 (circulation path 19a) communicate with one end and the other end of the rolling path 23, respectively. Therefore, the circulation member 19 circulates the balls 13 between one end and the other end of the rolling path 23.
  • a circulation path 19a is formed by one circulation member (nut component) 19. Similarly to the circulation paths a and b of each nut component member A and B explained in FIG.
  • the inner diameter D3 is set to be large, and the inner diameter D3 is set small at the intermediate portions a3 and b3 in the longitudinal direction. Therefore, it has substantially the same effect as that described with reference to FIG.
  • the first circulation member 16 and the second circulation member 17 are annular members, but they do not need to be annular.
  • it may be a circular arc shape or a block that is short in the circumferential direction but provided along the circumferential direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)

Abstract

Un dispositif de vis à billes selon la présente invention comprend un arbre à vis qui comporte une première rainure en spirale ménagée dans sa circonférence externe, un écrou qui comporte une seconde rainure en spirale ménagée dans sa circonférence interne, et une pluralité de billes (E) qui sont agencées sur un trajet de roulement qui est formé entre la première rainure en spirale et la seconde rainure en spirale. L'écrou comprend un ou plusieurs éléments de formation d'écrou (A, B). Des trajets de circulation (a, b) pour faire circuler les billes (E) entre l'une et l'autre extrémité du trajet de roulement sont formés dans les éléments de formation d'écrou (A, B). Les diamètres internes (D1, D2, D2') de parties d'extrémité de direction longitudinale (a1, a2, b1, b2) des trajets de circulation (a, b) des éléments de formation d'écrou (A, B) sont supérieurs aux diamètres internes (D3) de parties centrales de direction longitudinale (a3, b3).
PCT/JP2022/015786 2022-03-30 2022-03-30 Dispositif de vis à billes WO2023188058A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/015786 WO2023188058A1 (fr) 2022-03-30 2022-03-30 Dispositif de vis à billes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/015786 WO2023188058A1 (fr) 2022-03-30 2022-03-30 Dispositif de vis à billes

Publications (1)

Publication Number Publication Date
WO2023188058A1 true WO2023188058A1 (fr) 2023-10-05

Family

ID=88200276

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/015786 WO2023188058A1 (fr) 2022-03-30 2022-03-30 Dispositif de vis à billes

Country Status (1)

Country Link
WO (1) WO2023188058A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3924486A (en) * 1973-10-29 1975-12-09 Tech Integrale Screw and nut transmission mechanism
JP2003314655A (ja) * 2002-02-19 2003-11-06 Nsk Ltd ボールねじ
JP2009138914A (ja) * 2007-12-11 2009-06-25 Kuroda Precision Ind Ltd ボールねじ装置
CN202914660U (zh) * 2012-04-10 2013-05-01 锕玛科技股份有限公司 滚珠导螺杆
JP2016211697A (ja) * 2015-05-12 2016-12-15 株式会社アイエイアイ ボールねじナットとボールねじ機構とアクチュエータ
WO2017010407A1 (fr) * 2015-07-14 2017-01-19 日本精工株式会社 Vis à billes, machine-outil, et dispositif de transport
JP2017078439A (ja) * 2015-10-19 2017-04-27 日本精工株式会社 ボールねじ

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3924486A (en) * 1973-10-29 1975-12-09 Tech Integrale Screw and nut transmission mechanism
JP2003314655A (ja) * 2002-02-19 2003-11-06 Nsk Ltd ボールねじ
JP2009138914A (ja) * 2007-12-11 2009-06-25 Kuroda Precision Ind Ltd ボールねじ装置
CN202914660U (zh) * 2012-04-10 2013-05-01 锕玛科技股份有限公司 滚珠导螺杆
JP2016211697A (ja) * 2015-05-12 2016-12-15 株式会社アイエイアイ ボールねじナットとボールねじ機構とアクチュエータ
WO2017010407A1 (fr) * 2015-07-14 2017-01-19 日本精工株式会社 Vis à billes, machine-outil, et dispositif de transport
JP2017078439A (ja) * 2015-10-19 2017-04-27 日本精工株式会社 ボールねじ

Similar Documents

Publication Publication Date Title
WO2016125368A1 (fr) Dispositif de direction
US20070209465A1 (en) Screw Device And Method Of Manufacturing The Same
US8784253B2 (en) Transmission ratio variable device
JP4501068B2 (ja) 電動パワーステアリング装置
EP1524171B1 (fr) Mécanisme de vis à billes, procédé d'usinage pour joint entre écrou et balle circulation pièce, et direction assistée électrique
US6516680B1 (en) Power steering apparatus
WO2015129313A1 (fr) Dispositif à direction assistée et procédé de fabrication d'une vis à bille pour dispositif à direction assistée
WO2007114036A1 (fr) Dispositif de vis sphérique
US20220107002A1 (en) Coaxial gear mechanism
WO2023188058A1 (fr) Dispositif de vis à billes
WO2017154511A1 (fr) Dispositif de direction assistée
EP1596101B1 (fr) Mécanisme pour convertir un mouvement rotatif en mouvement linéaire.
WO2023188057A1 (fr) Dispositif de vis à billes
JP6984796B1 (ja) ボールねじ装置
KR19990006247A (ko) 동력보조 스티어링기어용 서보밸브
EP3996974B1 (fr) Arbre de la boîte de direction accouplé
CN113883246A (zh) 滚珠丝杠装置
JP5085303B2 (ja) 運動装置
US20050050973A1 (en) Device for converting rotary motion into translational motion
WO2023189044A1 (fr) Vis à billes
JP2022061214A (ja) ボールねじ装置
JP6621965B1 (ja) 伝動装置及びこれを用いた車両用ステアリング装置
JP7452766B2 (ja) ボールねじ装置
JP7226674B1 (ja) ボールねじ装置
JP2022030075A (ja) ボールねじ装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22935205

Country of ref document: EP

Kind code of ref document: A1