WO2022210462A1 - ボールねじ装置 - Google Patents
ボールねじ装置 Download PDFInfo
- Publication number
- WO2022210462A1 WO2022210462A1 PCT/JP2022/014786 JP2022014786W WO2022210462A1 WO 2022210462 A1 WO2022210462 A1 WO 2022210462A1 JP 2022014786 W JP2022014786 W JP 2022014786W WO 2022210462 A1 WO2022210462 A1 WO 2022210462A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- nut
- passages
- paths
- balls
- axial direction
- Prior art date
Links
- 238000005096 rolling process Methods 0.000 claims abstract description 41
- 238000005192 partition Methods 0.000 claims abstract description 26
- 230000002093 peripheral effect Effects 0.000 claims description 19
- 230000004308 accommodation Effects 0.000 claims description 7
- 210000002105 tongue Anatomy 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000004323 axial length Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000470 constituent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 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
- 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
Definitions
- the present invention relates to a ball screw device.
- the ball screw device of Patent Document 1 has two ball rolling paths. Further, in the ball screw device of Patent Document 1, the female threads of the nut and the male threads of the screw shaft are alternately arranged with respect to the two rolling paths. Furthermore, the distance between the female and male threads is smaller than the diameter of the ball. As a result, the ball is sandwiched between the female thread and the male thread, and a preload is applied to the ball. Moreover, the ball screw device of Patent Document 1 includes two tubes as components for circulating balls. The interior of this tube provides a return passage through which the ball passes. Also, the tips of the two tubes are arranged adjacent to each other, and the first and second balls scooped up from the rolling path enter.
- the ball screw device it is required to reduce the size of the nut in the axial direction.
- One possible way to achieve this miniaturization is to reduce the axial width of the female or male thread. If the axial width of the female thread or the male thread is reduced, the center-to-center distance between the first rolling path and the second rolling path becomes smaller. Accordingly, it is necessary to reduce the distance between the centers of the tips of the two tubes where the ball is scooped up. However, if the distance between the centers of the tips of the two tubes is small, the annular walls that make up the tubes may come into contact with each other. Therefore, in the ball screw device of Patent Document 1, the distance between the centers of the two tubes cannot be reduced. Therefore, in the ball screw device of Patent Document 1, the nut cannot be miniaturized in the axial direction.
- the present disclosure has been made in view of the above problems, and an object thereof is to provide a ball screw device in which the size of the nut can be reduced in the axial direction.
- a ball screw device includes: a nut having a female screw; two outer circumferential raceway surfaces arranged between the female screw; a male screw; two inner circumference raceway surfaces arranged therebetween; and two raceways between the two outer circumference raceway surfaces and the two inner circumference raceway surfaces. a plurality of arranged balls; and two circulation parts provided at one end and the other end of the nut for circulating the balls, wherein the female thread and the male thread sandwich the balls and hold the nut.
- the screw shaft has a tubular shape and includes a tubular portion having the male thread and the outer circumferential raceway surface, and two return passages penetrating the tubular portion in an axial direction parallel to the axis of the screw shaft; includes a main body portion fixed to the cylindrical portion of the nut, two communicating passages penetrating the main body portion and communicating the two rolling paths and the two return passages, and the two communicating passages.
- a partition wall for a communicating path that is located between the two communicating paths and that separates the two communicating paths, and two tongues that protrude from the main body portion to the rolling path.
- the ball screw device of the present disclosure circulates balls through two return passages and two communication passages.
- the distance between the centers of the two communication paths can be reduced. Therefore, the center-to-center distance between the two communicating paths can be made the same as the center-to-center distance between the first ball and the second ball.
- the body portion of the nut is provided with two housing grooves for housing the circulatory parts by recessing both end surfaces in the axial direction.
- the circulation component is arranged in the accommodation groove.
- the circulating part is housed in the housing groove, and the nut is made compact in the axial direction.
- the size of the nut can be reduced in the axial direction.
- FIG. 1 is a schematic diagram of a ball screw device of an embodiment.
- FIG. 2 is a view of the nut of the embodiment viewed from one axial direction.
- FIG. 3 is a view of the nut of the embodiment viewed from the other axial direction.
- FIG. 4 is a perspective view in which the screw shaft and the circulation device of the embodiment are extracted and obliquely viewed.
- 5 is a cross-sectional view taken along line VV of FIG. 1.
- FIG. 6 is a sectional view taken along the line VI-VI of FIG. 1.
- FIG. FIG. 7 is a diagram showing the relationship between the screw shaft and the tube in the ball screw of the comparative example.
- FIG. 1 is a schematic diagram of the ball screw device of the embodiment.
- FIG. 2 is a view of the nut of the embodiment viewed from one axial direction.
- FIG. 3 is a view of the nut of the embodiment viewed from the other axial direction.
- FIG. 4 is a perspective view in which the screw shaft and the circulation device of the embodiment are extracted and obliquely viewed.
- 5 is a cross-sectional view taken along line VV of FIG. 1.
- FIG. 6 is a sectional view taken along the line VI-VI of FIG. 1.
- FIG. FIG. 7 is a diagram showing the relationship between the screw shaft and the tube in the ball screw of the comparative example.
- the ball screw device 1 includes a screw shaft 2, a nut 10, a plurality of balls 3 arranged between the screw shaft 2 and the nut 10, and two circulation parts 40, 40. .
- the screw shaft 2 includes a male thread 4 protruding radially outward from an outer peripheral surface, and two rows of a first inner peripheral drive surface 5 and a second inner peripheral drive surface 6 arranged between the male threads 4 .
- the direction parallel to the axis X of the screw shaft 2 will be referred to as the axial direction.
- the nut 10 includes a tubular portion 11 through which the screw shaft 2 penetrates, two return passages 21 and 22 (see FIGS. 2 and 3 for the return passage 22), a partition wall 23 for the return passage, and a housing. and grooves 24 , 24 .
- the cylindrical portion 11 includes a female thread 12 protruding radially inward from the inner peripheral surface, and two rows of a first outer peripheral driving surface 13 and a second outer peripheral driving surface 14 arranged between the female thread 12 .
- the second outer driving surface 14 faces the first inner driving surface 5 in the radial direction.
- a first rolling path 31 is provided between the first inner driving surface 5 and the second outer driving surface 14 .
- the first outer driving surface 13 faces the second inner driving surface 6 in the radial direction.
- a second rolling path 32 is provided between the second inner driving surface 6 and the first outer driving surface 13 .
- the female thread 12 is axially displaced from the male thread 4 by half of one lead of the male thread 4 . That is, the male threads 4 and the female threads 12 are alternately arranged between the rolling paths 31 and 32 .
- a plurality of balls 3 are arranged in each of the first rolling path 31 and the second rolling path 32 .
- the diameter of ball 3 is slightly larger than the distance between male thread 4 and female thread 12 . That is, the ball 3 is sandwiched between the male thread 4 and the female thread 12 and is preloaded. Therefore, the ball 3 is in two-point contact between the male thread 4 and the female thread 12, and its behavior is stable. Also, the balls 3 on the first rolling path 31 and the balls 3 on the second rolling path 32 are back-to-back.
- end surfaces 15 and 16 of the cylindrical portion 11 of the nut 10 have a circular outer shape.
- the end faces 15 and 16 of the main body are provided with accommodation grooves 24 which are recessed in the axial direction.
- the housing groove 24 is a space for housing the circulation component 40 .
- the shape of the housing groove 24 when viewed from the axial direction corresponds to the shape of the circulation component 40 in the axial direction.
- the tubular portion 11 also has an inner side surface 24 a surrounding the inner peripheral side of the accommodation groove 24 , a bottom surface 24 b of the accommodation groove 24 , and an outer side surface 24 c surrounding the outer peripheral side of the accommodation groove 24 .
- the return passages 21 and 22 pass through the tubular portion 11 and extend linearly in the axial direction. Openings of the return passages 21 and 22 are provided on the bottom surface 24b.
- the return passages 21 and 22 are partitioned by a return passage partition wall 23 that is a part of the cylindrical portion 11 .
- the diameter of the return passages 21 , 22 is slightly larger than the diameter of the ball 3 . Therefore, the balls 3 roll smoothly inside the return passages 21 and 22 .
- the axial length L1 of the female thread 12 of the nut 10 is shorter than the axial length L2 of the male thread 4 of the screw shaft 2 . Therefore, the length of the nut 10 in the axial direction is reduced by the amount that the internal thread 12 is shortened in the axial direction. Further, as a result, the distance L3 (see FIGS. 1 and 4) between the centers of the first rolling path 31 and the second rolling path 32, which are arranged with the male screw 4 interposed therebetween, is also shortened.
- the circulation component 40 is a resin component that guides the balls 3 in the rolling paths 31 and 32 to the return paths 21 and 22 of the nut 10 and circulates the balls 3 .
- the circulation component 40 includes a body portion 41 fitted into the housing groove 24 of the nut 10, two communication passages 42 and 43, a communication passage partition wall 44, two tongues 45 and 46 (see FIG. 1), Prepare.
- the body portion 41 of the circulation component 40 is arranged in the housing groove 24 of the nut 10. As shown in FIG. The body portion 41 is sandwiched between the inner side surface 24a and the outer side surface 24c of the housing groove 24 (see FIGS. 2 and 3) and fixed to the nut 10. As shown in FIG. Further, as shown in FIG. 4, the body portion 41 has an outer peripheral surface 41a facing radially outward. The outer peripheral surface 41a faces the outer surface 24c.
- the communication paths 42 and 43 are open radially outward.
- the communication paths 42 and 43 are cut out from the outer peripheral surface 41 a of the body portion 41 , and the communication paths 42 and 43 are exposed from the outer peripheral surface 41 a of the body portion 41 .
- the radially outer sides of the communication paths 42 and 43 are closed by the outer side surface 24c of the nut. Therefore, the ball 3 rolls along the communication paths 42 and 43 .
- the diameters of the communicating paths 42 and 43 are slightly larger than the diameter of the ball 3 . Therefore, the balls 3 smoothly roll inside the communication paths 42 and 43 .
- the communication paths 42 and 43 extend radially outward from the rolling paths 31 and 32 and then extend in the circumferential direction. and second communication passages 42b, 43b extending axially from the passages 42a, 43a.
- the communication path partition wall 44 is a wall portion that partitions the communication paths 42 and 43 .
- the communication path partition wall 44 includes a first communication path partition wall 44a interposed between the first communication paths 42a and 43a and a second communication path partition wall 44a interposed between the second communication paths 42b and 43b. and a wall 44b.
- the thickness L10 of the partition wall 44a for the first communication path is the same as the length L1 of the female screw 12 in the axial direction. Therefore, the distance L11 between the centers of the first communication paths 42a and 43a is the same as the distance L3 between the centers of the first rolling path 31 and the second rolling path 32 .
- the thickness of the partition wall 44b for the second communication path is the same as that of the partition wall 23 for the return path. That is, the distance between the centers of the second communication paths 42b and 43b and the distance between the centers of the return paths 21 and 22 are the same.
- the tongues 45 and 46 enter the rolling path 31 of the first row and the rolling path 32 of the second row, and scoop the balls 3 into the communication paths 42 and 43.
- a comparative example describes a ball screw device 101 having two tubes 140, 141 as circulation parts. As shown in FIG. 7, the tubes 140, 141 have annular walls 140a, 141a, and return passages 140b, 141b are formed inside the walls 140a, 141a.
- the tips 140c, 141c of the two tubes 140, 141 open toward the rolling paths 131, 132 in order to scoop up the balls 3 on the rolling paths 131, 132.
- two wall portions 140a and 141a are interposed between the return passages 140b and 141b. Therefore, the distance L20 between the centers of the return passages 140b, 141b is relatively large. As a result, the distance L21 between the centers of the rolling paths 131 and 132 corresponding to the distance L20 is also increased.
- the two first communication paths 42a and 43a are partitioned by a single first communication path partition wall 44a, and the center of the first communication paths 42a and 43a
- the distance L11 between is small. Therefore, it is possible to reduce the distance L3 between the centers of the first rolling path 31 and the second rolling path 32, in other words, to reduce the axial length of the female screw 12.
- the ball screw device 1 of the embodiment includes the screw shaft 2, the nut 10, the balls 3, and the two circulation components 40.
- the screw shaft 2 has a male screw 4 and two inner circumference raceway surfaces (a first inner circumference drive surface 5 and a second inner circumference drive surface 6 ) arranged between the male screws 4 .
- the nut 10 has a female thread 12 and two outer peripheral raceway surfaces (a first outer peripheral drive surface 13 and a second outer peripheral drive surface 14 ) arranged between the female threads 12 .
- a plurality of balls 3 are arranged on each of the two rolling paths 31 and 32 between the two outer circumference raceway surfaces and the two inner circumference raceway surfaces.
- the circulation parts 40 are provided at one end and the other end of the nut 10 to circulate the balls 3 .
- the female thread 12 and the male thread 4 sandwich the ball 3 .
- the nut 10 has a tubular shape, a tubular portion 11 having a male thread 4 and an outer peripheral raceway surface (a first outer peripheral drive surface 13 and a second outer peripheral drive surface 14), and two return grooves extending through the tubular portion 11 in the axial direction. Passages 21, 22 are provided.
- the circulation component 40 includes a main body portion 41 fixed to the cylindrical portion 11 of the nut 10, and two communication components that pass through the main body portion 41 and allow the two rolling paths 31 and 32 and the two return paths 21 and 22 to communicate with each other.
- the nut 10 can be made compact in the axial direction.
- cylindrical portion 11 of the nut 10 of the embodiment has two housing grooves 24, 24 for housing the circulation component 40 by recessing both end faces in the axial direction.
- the circulation component 40 is arranged in the accommodation groove 24 .
- the circulation component 40 does not protrude from the end faces 15, 16 of the nut 10. Therefore, it is possible to prevent the nut 10 from increasing in size in the axial direction.
- the ball screw device of the present disclosure is not limited to the above example.
- the screw between the first rolling path 31 and the second rolling path 32 is the female screw 12, but in the ball screw device of the present disclosure, the male screw 4 is used. good too. According to this, the axial length of the male screw 4 is reduced, and as a result, the lead-to-lead distance of the male screw 4 is reduced. Therefore, the size of the nut 10 is reduced in the axial direction.
- the balls 3 arranged in the first rolling path 31 and the second rolling path 32 are arranged in a back-to-back combination, but may be in a front-to-back combination. Further, the thickness L10 of the first communication path partition wall 44a and the thickness of the second communication path partition wall 44b may be the same.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
Description
図1に示すように、ボールねじ装置1は、ねじ軸2と、ナット10と、ねじ軸2とナット10との間に配置される複数のボール3と、2つの循環部品40、40を備える。ねじ軸2は、外周面から径方向外側に突出する雄ねじ4と、雄ねじ4間に配置される2条の第1内周駆動面5、第2内周駆動面6と、を備える。以下、ねじ軸2の軸Xと平行な方向を軸方向という。
2 ねじ軸
3 ボール
4 雄ねじ
5 第1内周駆動面
6 第2内周駆動面
10 ナット
11 筒部
12 雌ねじ
13 第1外周駆動面
14 第2外周駆動面
21、22 戻り通路
23 戻り通路用仕切り壁
24 収容溝
31、32 転動路
40 循環部品
41 本体部
42、43 連通路
44 連通路用仕切り壁
44a 第1連通路用仕切り壁
44b 第2連通路用仕切り壁
45、46 タング
Claims (2)
- 雌ねじと、前記雌ねじの間に配置された2条の外周軌道面と、を有するナットと、
雄ねじと、前記雄ねじの間に配置された2条の内周軌道面と、を有するねじ軸と、
2条の前記外周軌道面と2条の前記内周軌道面との間にある2条の転動路のそれぞれに配置される複数のボールと、
前記ナットの一端と他端に設けられて前記ボールを循環させる2つの循環部品と、
を備え、
前記雌ねじと、前記雄ねじとは、前記ボールを挟持し、
前記ナットは、
筒状を成し、前記雄ねじ及び前記外周軌道面を有する筒部と、
前記ねじ軸の軸と平行な軸方向に前記筒部を貫通する2つの戻り通路と、
を備え、
前記循環部品は、
前記ナットの前記筒部に固定される本体部と、
前記本体部を貫通し、2条の前記転動路と2つの前記戻り通路を連通させる2つの連通路と、
2つの前記連通路の間にあり、2つの前記連通路を仕切る連通路用仕切り壁と、
前記本体部から前記転動路に突出する2つのタングと、
を備える
ボールねじ装置。 - 前記ナットの前記筒部は、前記軸方向の両端面を窪ませて、前記循環部品を収容する2つの収容溝を備え、
前記循環部品は、前記収容溝に配置される
請求項1に記載のボールねじ装置。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22780673.4A EP4317744A1 (en) | 2021-03-31 | 2022-03-28 | Ball screw device |
JP2023511219A JPWO2022210462A1 (ja) | 2021-03-31 | 2022-03-28 | |
CN202280023961.7A CN117157474A (zh) | 2021-03-31 | 2022-03-28 | 滚珠丝杠装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021-062260 | 2021-03-31 | ||
JP2021062260 | 2021-03-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022210462A1 true WO2022210462A1 (ja) | 2022-10-06 |
Family
ID=83459122
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2022/014786 WO2022210462A1 (ja) | 2021-03-31 | 2022-03-28 | ボールねじ装置 |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP4317744A1 (ja) |
JP (1) | JPWO2022210462A1 (ja) |
CN (1) | CN117157474A (ja) |
TW (1) | TW202246681A (ja) |
WO (1) | WO2022210462A1 (ja) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56120851A (en) * | 1980-02-29 | 1981-09-22 | Hiroshi Teramachi | Ball screw with retainer |
JPS56147954A (en) | 1980-04-17 | 1981-11-17 | Hiroshi Teramachi | Retainerless ball screw |
JP2004108408A (ja) * | 2002-09-13 | 2004-04-08 | Nsk Ltd | ボールねじ用ボール循環こま及びボールねじ |
CN100398872C (zh) * | 2004-08-20 | 2008-07-02 | 上银科技股份有限公司 | 滚动螺杆 |
US20110239799A1 (en) * | 2010-03-30 | 2011-10-06 | Bir Inder Singh | Linear motion assembly with recirculation insert |
-
2022
- 2022-03-28 EP EP22780673.4A patent/EP4317744A1/en active Pending
- 2022-03-28 WO PCT/JP2022/014786 patent/WO2022210462A1/ja active Application Filing
- 2022-03-28 CN CN202280023961.7A patent/CN117157474A/zh active Pending
- 2022-03-28 JP JP2023511219A patent/JPWO2022210462A1/ja active Pending
- 2022-03-31 TW TW111112457A patent/TW202246681A/zh unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56120851A (en) * | 1980-02-29 | 1981-09-22 | Hiroshi Teramachi | Ball screw with retainer |
JPS56147954A (en) | 1980-04-17 | 1981-11-17 | Hiroshi Teramachi | Retainerless ball screw |
JP2004108408A (ja) * | 2002-09-13 | 2004-04-08 | Nsk Ltd | ボールねじ用ボール循環こま及びボールねじ |
CN100398872C (zh) * | 2004-08-20 | 2008-07-02 | 上银科技股份有限公司 | 滚动螺杆 |
US20110239799A1 (en) * | 2010-03-30 | 2011-10-06 | Bir Inder Singh | Linear motion assembly with recirculation insert |
Also Published As
Publication number | Publication date |
---|---|
TW202246681A (zh) | 2022-12-01 |
JPWO2022210462A1 (ja) | 2022-10-06 |
EP4317744A1 (en) | 2024-02-07 |
CN117157474A (zh) | 2023-12-01 |
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