WO2023042635A1 - ボールねじ装置 - Google Patents
ボールねじ装置 Download PDFInfo
- Publication number
- WO2023042635A1 WO2023042635A1 PCT/JP2022/032024 JP2022032024W WO2023042635A1 WO 2023042635 A1 WO2023042635 A1 WO 2023042635A1 JP 2022032024 W JP2022032024 W JP 2022032024W WO 2023042635 A1 WO2023042635 A1 WO 2023042635A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- nut body
- circulation path
- screw device
- ball screw
- circulation
- Prior art date
Links
- 238000005096 rolling process Methods 0.000 claims abstract description 61
- 230000002093 peripheral effect Effects 0.000 claims description 37
- 238000003754 machining Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
-
- 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.
- a large number of balls are rotatably arranged in a rolling path composed of a thread groove formed on the inner circumference of a nut and a thread groove formed on the outer circumference of a screw shaft.
- the ball that has reached is returned to the starting point of the rolling path through the circulation path.
- a tube-type ball screw device has a structure in which the tube protrudes from the outer circumference of the nut, which leads to an increase in the size of the ball screw device.
- a circulation path 112 is formed by a nut body 103 and a guide plate 105 fixed to its outer periphery.
- the balls that reach the end of rolling path 108 formed by thread groove 107 of nut body 103 and thread groove 106 of screw shaft 102 are connected to connection path 110, circulation path 112, and the other connection. It is returned to the starting point of the rolling path 108 via a path (not shown).
- the ball screw device 100 since the guide plate 105 does not protrude from the outer circumference of the nut body 103, the ball screw device can be made smaller than the tube-type ball screw device described above.
- an object of the present invention is to smoothly rotate the nut and the screw shaft relative to each other by smoothly circulating the balls of the ball screw device.
- the present invention provides a nut having a nut body with a thread groove formed on its inner periphery, a nut having a circulation path forming member fixed to the outer peripheral surface of the nut body, and a thread groove on its outer periphery.
- a screw shaft formed with, a rolling path formed by the thread groove of the nut body and the thread groove of the screw shaft, and a circulation path formed by the outer peripheral surface of the nut body and the circulation path forming member , a pair of connecting passages respectively connecting one end of the circulation passage and one end of the rolling passage, and the other end of the circulation passage and the other end of the rolling passage, the rolling passage, the circulation passage, and the pair , wherein the circulation path is formed along the cylindrical portion of the outer peripheral surface of the nut body.
- the circulation path formed by the outer peripheral surface of the nut body and the circulation path forming member is formed in an arch shape along the cylindrical portion of the outer peripheral surface of the nut body.
- the ball screw device shown in FIG. 14 is assembled by placing the balls 104 in the circulation path 112 formed in the guide plate 105 and then fixing the guide plate 105 to the nut body 103 .
- workability is poor.
- the circulation path with a circulation groove formed in the cylindrical portion of the outer peripheral surface of the nut body and a circulation path forming member covering the circulation groove.
- the ball screw device can be easily assembled by placing the balls in the circulation groove formed on the outer peripheral surface of the nut body and then covering the outer periphery with the circulation path forming member.
- the circulation path forming member can be formed. Since it does not protrude from the outer peripheral surface of the nut body, the outer diameter of the nut can be reduced.
- the circulation path forming member has a groove that forms the circulation path, and an opening extending along the extending direction of the groove is provided in the bottom of the groove, so that the edge of the opening is the outermost diameter part.
- the outer diameter of the circulation path forming member can be reduced so that This makes it easier to secure a space for providing other members on the outer periphery of the circulation path forming member.
- the circulation path forming member can be fixed to the nut body by crimping or gluing.
- the above ball screw device has, for example, a coiled ball pick-up member that is screwed into the thread groove of the nut body.
- a guide surface provided at the end of the ball pick-up member can guide the ball from the rolling path to the connecting path.
- the ball may collide with the guide surface of the ball pick-up member, causing the ball pick-up member to rotate relative to the nut and the position of the guide surface to be displaced. Therefore, it is preferable to provide anti-rotation means for restricting relative rotation between the ball pick-up member and the nut.
- the nut body and the inner ring of the rolling bearing can be integrally formed as one piece.
- the nut body and the inner ring of the rolling bearing may be formed as separate parts, and a mounting surface to which the inner ring of the rolling bearing is mounted may be provided on the outer peripheral surface of the nut body.
- the circulation path can be extended to the axial region of the inner ring, that is, to the axial region of the mounting surface, thereby increasing the length of the rolling raceway and increasing the load capacity of the ball screw device. can.
- a screw groove is usually formed on the entire inner peripheral surface of the nut body, and part of it functions as a rolling path.
- a member such as a ball pick-up member
- a cylindrical portion in which no thread groove is formed may be provided in a region of the inner peripheral surface of the nut body on one side in the axial direction relative to the rolling path. In this way, by omitting the thread grooves that do not function as rolling paths, it is possible to prevent balls from entering the thread grooves that do not function as rolling paths without providing a member such as a ball pick-up member.
- the balls of the ball screw device can be smoothly circulated, and the nut and the screw shaft can be smoothly rotated relative to each other.
- FIG. 1 is a plan view of a ball screw device according to a first embodiment of the present invention
- FIG. FIG. 2 is a cross-sectional view taken along line AA of FIG. 1
- FIG. 2 is an exploded perspective view of the ball screw device of FIG. 1
- FIG. 2 is a cross-sectional view taken along line BB of FIG. 1
- FIG. 3 is a cross-sectional view taken along line CC of FIG. 2; It is the side view seen from the D direction of FIG. It is the side view seen from the E direction of FIG. It is a perspective view of a ball screw device according to a second embodiment of the present invention.
- FIG. 9 is a cross-sectional view of the ball screw device of FIG.
- FIG. 8 It is a perspective view of a ball screw device according to a third embodiment of the present invention.
- FIG. 11 is a partially exploded perspective view of the ball screw device of FIG. 10;
- FIG. 11 is a plan view of the ball screw device of FIG. 10;
- It is a sectional view of a ball screw device concerning a fourth embodiment of the present invention.
- FIG. 3 is a cross-sectional view of a conventional ball screw device;
- a ball screw device 1 mainly includes a nut 2, a screw shaft 3, and a large number of balls 4, as shown in FIGS.
- the nut 2 has a nut body 5 and a cover 6 as a circulation path forming member.
- This ball screw device 1 is of a nut rotation type in which a nut 2 is rotated to axially move a screw shaft 3, and the nut 2 is rotatably supported by a rolling bearing (for example, a deep groove ball bearing).
- a rolling bearing for example, a deep groove ball bearing
- the nut body 5 and the inner ring 7a of the rolling bearing are integrally formed as one component.
- a helical thread groove 5a is formed on the inner periphery of the nut body 5, and a helical thread groove 3a is formed on the outer periphery of the screw shaft 3.
- a part of the thread groove 5a of the nut body 5 and a part of the thread groove 3a of the screw shaft 3 form a rolling path 10 for the balls 4 (see FIG. 2).
- the ball screw device 1 is provided with a circulation path 20 and a pair of connection paths 30 for circulating the balls 4 of the rolling path 10 .
- a circulation path 20 is formed by the outer peripheral surface of the nut body 5 and the cover 6 .
- a pair of connection paths 30 communicate one end of the circulation path 20 with one end of the rolling path 10 and the other end of the circulation path 20 with the other end of the rolling path 10 .
- a large number of balls 4 are rotatably arranged in the circulation path formed by the rolling path 10 , the circulation path 20 , and the pair of connection paths 30 .
- the ball 4 that has reached the end point of the rolling path 10 is returned to the starting point of the rolling path 10 through one connection path 30 , the circulation path 20 and the other connection path 30 .
- a concave portion 5b is provided in a circumferential partial region of the outer peripheral surface of the nut body 5 (see FIG. 3).
- a cylindrical portion 5c is provided on the bottom surface of the recess 5b.
- a large-diameter cylindrical portion 5d having a larger diameter than the cylindrical portion 5c is provided in a circumferential region of the outer peripheral surface of the nut body 5 other than the concave portion 5b.
- a circulation groove 5e is formed in the cylindrical portion 5c.
- a pair of through holes 5 f are formed in the nut body 5 , and the pair of through holes 5 f function as a pair of connecting paths 30 .
- each through hole 5f opens to the end of the circulation groove 5e, and the other end opens to the screw groove 5a.
- the through hole 5f is formed linearly by machining using a drill or the like.
- the cover 6 is fixed to the outer peripheral surface of the nut body 5, and is attached to the recess 5b of the nut body 5 in the illustrated example.
- the illustrated cover 6 is a plate-like member having a uniform thickness, and is made of, for example, a press-molded metal plate such as a steel plate.
- the cover 6 may be formed of a resin molded product or a sintered body (MIM molded product).
- the cover 6 integrally has a cylindrical portion 6b, a raised portion 6c that rises radially outward from the cylindrical portion 6b, and mounting portions 6d that are provided at both circumferential ends of the cylindrical portion 6b (see FIGS. 1 and 3). .
- the inner surface of the raised portion 6c of the cover 6 forms the groove 6a (see FIG.
- the cylindrical portion 6b covers the cylindrical portion 5c of the outer peripheral surface of the nut body 5 from the outer diameter side, and the raised portion 6c covers the circulation groove 5e of the nut body 5 from the outer diameter side.
- the mounting portion 6d is fixed to the outer peripheral surface of the nut body 5 by appropriate means such as caulking or adhesion.
- the cover 6 is accommodated within the depth direction region of the recess 5b on the outer peripheral surface of the nut body 5. Specifically, the outermost diameter portion of the cover 6, that is, the top portion of the raised portion 6c is arranged on the inner diameter side of the imaginary cylindrical surface obtained by extending the large-diameter cylindrical surface 5d of the outer peripheral surface of the nut body 5. As shown in FIG. As a result, since the cover 6 does not protrude from the outer circumference of the nut body 5, the outer diameter of the nut 2 can be reduced.
- the circulation path 20 is formed along the cylindrical portion 5c of the outer peripheral surface of the nut body 5 (see FIG. 4).
- a circulation path 20 is formed by a circulation groove 5e formed in the cylindrical portion 5c of the nut body 5 and a groove 6a (inner surface of the raised portion 6c) provided along the cylindrical portion 6b of the cover 6. be.
- the circulation path 20 extends in a direction inclined with respect to the axial direction and the circumferential direction (see FIG. 1). In the illustrated example, the circulation path 20 extends in a direction forming a constant angle with respect to the circumferential direction. As shown in FIG.
- the dimension in the direction orthogonal to the axial direction of the circulation path 20 is direction) dimension.
- the dimension of the circulation path 20 in the direction orthogonal to the axial direction is larger than the outer diameter of the screw shaft 3 (the outer diameter at the crest of the thread).
- connection path 30 consists of a through hole 5f provided in the nut body 5, for example.
- One end of the connection path 30 is connected to the end of the rolling path 10 and the other end of the connection path 30 is connected to the end of the circulation path 20 .
- the connection path 30 extends tangentially to the end (start point or end point) of the rolling path 10 in a cross section perpendicular to the axis (see FIG. 5), and extends in a direction perpendicular to the axial direction in an axial cross section.
- the pair of connection paths 30 are parallel.
- the start point and the end point of the rolling path 10 may be provided on the circulation path 20 side (above in FIG. 4) from the plane L, and the connection path 30 may be extended from there. In this case, the distance between the pair of connection paths 30 gradually narrows from the rolling path 10 toward the circulation path 20 .
- the start point and the end point of the rolling path 10 may be provided on the opposite side of the plane L from the circulation path 20 (lower in FIG. 4), and the connection path 30 may be extended from there. In this case, the distance between the pair of connection paths 30 gradually widens from the rolling path 10 toward the circulation path 20 .
- a bent portion 40 is formed at the boundary between the circulation path 20 and the connection path 30 .
- the circulation path 20 is formed in an arch shape along the cylindrical portion 5c of the nut body 5, the bending angle of the boundary between the circulation path 20 and the connection path 30 can be moderated.
- the balls 4 smoothly move from the connection path 30 to the circulation path 20, and the balls 4 smoothly circulate in the circulation path, so that the nut 2 and the screw shaft 3 can be smoothly rotated relative to each other.
- the circulation path 20 since the ball screw device 1 of the present embodiment is of the nut rotation type, the circulation path 20 has an arch shape along the cylindrical portion 5c as described above. , the movement of the balls 4 in the circulation path 20 is promoted, so that the balls 4 circulate more smoothly.
- each ball pick-up member 8 is provided with a guide surface 8a.
- a guide surface 8 a of the ball pick-up member 8 is arranged at a position that closes the thread groove 5 a and faces the connection path 30 .
- the balls 4 reaching the end point of the rolling path 10 are scooped up by the guide surface 8a of the ball pick-up member 8 and guided to the connecting path 30 without entering the screw grooves 3a and 5a that do not form the rolling path 10.
- the ball pick-up member 8 When the ball 4 repeatedly collides with the guide surface 8a of the ball pick-up member 8, the ball pick-up member 8 may rotate with respect to the nut 2 and the position of the guide surface 8a may be displaced.
- a detent mechanism for restricting relative rotation between the ball pick-up member 8 and the nut 2 is provided.
- the relative rotation between the ball pick-up member 8 and the nut 2 is restricted by engaging them in both rotational directions. Specifically, as shown in FIGS. 6 and 7, the other end of the ball pick-up member 8 (the end opposite to the guide surface 8a) is bent radially outward, and the nut body 5 A locking groove 5g provided on the end surface of the . By fitting the engagement portion 8b of the ball pick-up member 8 into the engagement groove 5g of the nut body 5 and engaging them in the circumferential direction, rotation of the ball pick-up member 8 with respect to the nut 2 is restricted.
- the above ball screw device 1 can be assembled according to the following procedure. First, the screw shaft 3 is inserted into the inner circumference of the nut body 5, and the rolling path 10 is formed by the screw grooves 5a and 3a. After that, the ball pick-up members 8 are screwed into the thread grooves 5a of the nut body 5 from both sides in the axial direction, and the guide surfaces 8a are arranged at predetermined positions (see FIG. 5). Then, the balls 4 are inserted from the through holes 5 f of the nut body 5 to fill the rolling path 10 and the pair of connection paths 30 with the balls 4 .
- the ball screw device 1 is completed by fitting the balls 4 into the circulation grooves 5e of the nut body 5, covering the outer periphery of the balls 4 with the cover 6, and fixing them to the nut body 5.
- the balls 4 can be easily incorporated into the circulation path 20 by placing the balls 4 in the circulation grooves 5e of the nut body 5 and then putting the cover 6 thereon.
- the present invention is not limited to the above embodiments. Other embodiments of the present invention will be described below, but descriptions of the same points as those of the above-described embodiments will be omitted.
- an opening 6e is provided in the raised portion 6c of the cover 6.
- the opening 6e is provided at the top of the raised portion 6c (that is, the bottom of the groove 6a) and extends along the extending direction of the raised portion 6c (that is, the extending direction of the groove 6a).
- the width W of the opening 6e is smaller than the diameter D of the ball 4.
- the outermost diameter of the cover 6 is the edge of the opening 6e. 6 (the top of the raised portion 6c) on the inner diameter side. As a result, the outer diameter of the cover 6 is reduced, making it easier to avoid interference with other members arranged on the outer periphery of the cover 6 .
- the nut body 5 and the inner ring 7a of the rolling bearing 7 are separately formed and then fixed.
- a mounting surface 5h is provided at one end in the axial direction of the outer peripheral surface of the nut body 5, and the inner ring 7a is fixed to the mounting surface 5h by press fitting or the like.
- a recessed portion 5b (cylindrical portion 5c) formed in the outer peripheral surface of the nut body 5 reaches an axial region of the inner ring 7a of the rolling bearing 7, and a part of the cover 6 attached to the recessed portion 5b extends to the inner periphery of the inner ring 7a. (see FIG. 10).
- a radial gap is formed between the cylindrical portion 6b of the cover 6 and the inner peripheral surface of the inner ring 7a, and a portion of the raised portion 6c of the cover 6 enters this gap. That is, as shown in FIG. 12, part of the raised portion 6c (circulation path 20) of the cover 6 is arranged on the inner circumference of the inner ring 7a.
- the circulation groove 5e cannot be formed in the axial region of the inner ring 7a on the outer peripheral surface of the nut body 5.
- the inner ring 7a is assembled to the nut body 5 after the circulation groove 5e and the through hole 5f are formed in the nut body 5. Therefore, the circulation groove 5e, that is, the circulation path 20 is formed. , to the axial region of the inner ring 7a, ie to the axial region of the mounting surface 5h.
- the thread groove 5a on the inner peripheral surface of the nut body 5 is provided only in the portion that functions as the rolling path 10. That is, the inner peripheral surface of the nut body 5 is provided with a cylindrical surface 5i in which the thread groove 5a is not formed in a region axially outside the rolling path 10 .
- a thread groove that does not function as the rolling path 10 is not provided, a situation in which the balls 4 enter such a thread groove can be avoided. Therefore, since the ball pick-up member 8 provided in the above embodiment becomes unnecessary, the number of parts can be reduced and the cost can be reduced.
- the cylindrical surface 5i may be provided only in the region on one side in the axial direction of the rolling path 10, and the thread groove 5a may be formed in the region on the other side in the axial direction. In this case, since the other axial end of the thread groove 5a reaches the axial end of the inner peripheral surface of the nut body 5, machining is facilitated.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
Description
2 ナット
3 ねじ軸
3a ねじ溝
4 ボール
5 ナット本体
5a ねじ溝
5c 円筒部
5e 循環溝
5f 貫通孔
5g 係止溝
6 カバー(循環路形成部材)
6a 溝
6b 円筒部
6c 盛り上がり部
7 転がり軸受
7a 内輪
8 ボール拾い上げ部材
8a 案内面
8b 係止部
10 転走路
20 循環路
30 接続路
Claims (10)
- 内周にねじ溝が形成されたナット本体、及び、前記ナット本体の外周面に固定された循環路形成部材を有するナットと、
外周にねじ溝が形成されたねじ軸と、
前記ナット本体のねじ溝と前記ねじ軸のねじ溝とで形成された転走路と、
前記ナット本体の外周面と前記循環路形成部材とで形成された循環路と、
前記循環路の一端と前記転走路の一端、及び、前記循環路の他端と前記転走路の他端とをそれぞれ連通する一対の接続路と、
前記転走路、前記循環路、及び前記一対の接続路に配された多数のボールとを備えたボールねじ装置において、
前記循環路が、前記ナット本体の外周面の円筒部に沿って形成されたボールねじ装置。 - 前記循環路が、前記ナット本体の外周面の前記円筒部に形成された循環溝と、前記循環溝を覆う前記循環路形成部材とを有する請求項1に記載のボールねじ装置。
- 前記ナット本体の外周面の周方向一部領域に、他の周方向領域よりも内径側に凹んだ凹部を設け、
前記循環路形成部材を前記凹部の深さ方向領域内に収容した請求項1又は2に記載のボールねじ装置。 - 前記循環路形成部材が、前記循環路を形成する溝を有し、
前記溝の底部に、前記溝の延在方向に沿って延びる開口部を設け、
前記開口部の縁が前記循環路形成部材の最外径部である請求項1~3の何れか1項に記載のボールねじ装置。 - 前記循環路形成部材が、前記ナット本体に加締めにより固定された請求項1~4の何れか1項に記載のボールねじ装置。
- 前記循環路形成部材が、前記ナット本体に接着により固定された請求項1~4の何れか1項に記載のボールねじ装置。
- 前記ナット本体のねじ溝に螺合するコイル状のボール拾い上げ部材を有し、
前記ボール拾い上げ部材の端部に、前記転走路から前記接続路へボールを案内する案内面が設けられ、
前記ボール拾い上げ部材と前記ナットとの相対回転を規制する回り止め手段を有する請求項1~6の何れか1項に記載のボールねじ装置。 - 前記ナット本体と転がり軸受の内輪とが一部品として一体形成された請求項1~7の何れか1項に記載のボールねじ装置。
- 前記ナット本体の外周面に、転がり軸受の内輪が取り付けられる取付面を有し、
前記循環路が、前記取付面の軸方向領域まで延びている請求項1~7の何れか1項に記載のボールねじ装置。 - 前記ナット本体の内周面のうち、前記転走路よりも軸方向一方側の領域に、前記ねじ溝が形成されていない円筒部を設けた請求項1~9の何れか1項に記載のボールねじ装置。
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CN202280059592.7A CN117897568A (zh) | 2021-09-15 | 2022-08-25 | 滚珠丝杠装置 |
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JP2021-150471 | 2021-09-15 | ||
JP2021150471A JP2023043009A (ja) | 2021-09-15 | 2021-09-15 | ボールねじ装置 |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002276764A (ja) | 2001-03-22 | 2002-09-25 | Ntn Corp | ボールねじ |
JP2002295625A (ja) | 2001-03-30 | 2002-10-09 | Ntn Corp | ボールねじ |
JP2008169983A (ja) * | 2007-01-15 | 2008-07-24 | Nsk Ltd | 直動装置およびその点検方法 |
JP2016105000A (ja) * | 2014-12-01 | 2016-06-09 | Thk株式会社 | ボールねじ |
JP2019210996A (ja) * | 2018-06-04 | 2019-12-12 | 日本精工株式会社 | ボールねじ |
-
2021
- 2021-09-15 JP JP2021150471A patent/JP2023043009A/ja active Pending
-
2022
- 2022-08-25 CN CN202280059592.7A patent/CN117897568A/zh active Pending
- 2022-08-25 WO PCT/JP2022/032024 patent/WO2023042635A1/ja active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002276764A (ja) | 2001-03-22 | 2002-09-25 | Ntn Corp | ボールねじ |
JP2002295625A (ja) | 2001-03-30 | 2002-10-09 | Ntn Corp | ボールねじ |
JP2008169983A (ja) * | 2007-01-15 | 2008-07-24 | Nsk Ltd | 直動装置およびその点検方法 |
JP2016105000A (ja) * | 2014-12-01 | 2016-06-09 | Thk株式会社 | ボールねじ |
JP2019210996A (ja) * | 2018-06-04 | 2019-12-12 | 日本精工株式会社 | ボールねじ |
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CN117897568A (zh) | 2024-04-16 |
JP2023043009A (ja) | 2023-03-28 |
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