WO2012077247A1 - ボールねじ装置 - Google Patents
ボールねじ装置 Download PDFInfo
- Publication number
- WO2012077247A1 WO2012077247A1 PCT/JP2011/000624 JP2011000624W WO2012077247A1 WO 2012077247 A1 WO2012077247 A1 WO 2012077247A1 JP 2011000624 W JP2011000624 W JP 2011000624W WO 2012077247 A1 WO2012077247 A1 WO 2012077247A1
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- WO
- WIPO (PCT)
- Prior art keywords
- ball
- circulation
- nut
- path
- screw device
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
- F16H25/2214—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls with elements for guiding the circulating balls
- F16H25/2223—Cross over deflectors between adjacent thread turns, e.g. S-form deflectors connecting neighbouring threads
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- 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
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- 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
Definitions
- the present invention relates to a ball screw device used for various machine devices such as a machine tool and an injection molding machine, and more particularly to a ball screw device provided with a tubular circulation part.
- a ball screw device described in Patent Document 1 As a conventional ball screw device of this type, a ball screw device described in Patent Document 1 is disclosed.
- a resin circulation part (not shown) is divided into two parts and a nut circulation hole is provided.
- the central axis of the circulation path in the leg part of the circulation component fitted to the two is substantially coincident with the tangential direction of both screw grooves and the lead angle direction (generally coincident with the tangential direction of the spiral track).
- FIGS. 6A and 6B are diagrams showing a configuration of a conventional ball screw device described in Patent Document 2, wherein FIG. 6A is a plan view, and FIG. 6B is a view of a circulating component viewed from the axial direction of the screw shaft.
- the ball screw device 101 disclosed in Patent Document 2 includes a screw shaft 110 having a helical screw groove 111 on the outer peripheral surface and a screw groove 111 on the inner peripheral surface.
- a nut 120 having a helical thread groove (not shown) corresponding to is screwed together.
- a number of balls (not shown) are slidably loaded in the spiral track K between the thread groove 111 and the thread groove of the nut 120.
- a flat surface 120a is formed on the peripheral surface of the nut 120, and two pairs of circulation holes 122, 122 communicating with the spiral track K are formed in the flat surface 120a.
- the circulation component 140 is installed so that both ends thereof are fitted to the pair of circulation holes 122, 122, and the ball is guided from one circulation hole 122 to the outside of the nut 120 and spiraled from the other circulation hole 122.
- a ball circulation path returning to the track K is formed.
- the circulating component 140 includes a pair of leg portions 141 and 141 each having a tongue portion 144 that scoops a ball rolling on the spiral track K at each end in a direction substantially coincident with the tangential direction of the spiral track K, and the pair of leg portions.
- the circulation component 140 includes a pair of leg portions 141 and 141 and a main body 142 that connects the pair of leg portions 141 and 141, and the inside is a ball circulation path R.
- the direction of the ball circulation path R is
- the divided bodies 140a and 140a divided into two in a point-symmetrical manner are joined to each other at the divided surfaces, and a circulation groove 143 constituting the ball circulation path R is formed on the divided surface of each divided body 140a. Has been.
- the circulation groove 143 which comprises the ball
- the first curved portion R1 has a traveling direction of a ball scooped up from the spiral trajectory K by the tongue portion 144 of one leg portion 141 of the pair of leg portions 141, 141 in a direction toward the outside of the nut 120, and It is a portion that leads to a direction that substantially coincides with the axial direction of the circulation hole 122 or has a predetermined angle.
- the second bending portion R2 is a portion that guides the ball that has passed through the first bending portion R1 in the direction of the other leg portion 141.
- the third bending portion R3 is a portion that guides the ball that has passed through the second bending portion R2 to the inside of the other leg portion 141 through the main body 142.
- the fourth bending portion R4 is a portion that guides the ball that has passed through the third bending portion R3 to the position of the tongue portion 144 of the other leg portion 141.
- the strength of the tongue portion 144 may be reduced as a result of inevitably dividing the tongue portion and the leg portion 141 connected to the tongue portion 144. So there was room for improvement.
- An object of the present invention is to provide a ball screw device capable of ensuring the strength of the tongue portion, ensuring the strength of the tongue portion, and evenly forming the circulation path so that the balls can be circulated more smoothly.
- a ball screw device includes a screw shaft having a spiral screw groove on an outer peripheral surface, and a spiral screw groove corresponding to the screw groove of the screw shaft.
- a nut that has an inner peripheral surface and is screwed onto the screw shaft; a number of balls that are slidably loaded on the spiral track between the screw grooves; and the ball that rolls on the spiral track,
- One of a pair of circulation holes drilled in a direction substantially perpendicular to the axis of the nut on a flat surface formed on the side surface in the circumferential direction of the nut is led to the outside of the nut, and the other
- a circulation part having both ends fitted to each circulation hole in order to form a ball circulation path from the circulation hole back to the spiral track,
- the circulation part is fitted in the circulation hole of the nut at both ends, and a tongue part that scoops up the ball rolling the spiral track at each end in a direction substantially coincident with the tangential direction of the spiral track.
- the second dividing surface is such that when the circulating part is viewed from the flat surface direction of the nut, the upper dividing surface and the lower dividing surface intersect with each other when the circulating part is viewed from the flat surface direction of the nut. It is formed to do.
- a ball screw device According to a ball screw device according to an embodiment of the present invention, even if the lead angle and the number of circulation turns are small, the tongue portion and the leg portion connected to the tongue portion are minimized, and the strength of the tongue portion is reduced. Can be ensured, and the circulation path can be equally formed. Therefore, it is possible to provide a ball screw device that enables smooth circulation of the ball.
- FIG. 1 It is a top view in one embodiment of a ball screw device concerning the present invention. It is a right view of FIG. It is a perspective view which shows the division
- (C) is the figure seen from the axial direction of the screw shaft (figure seen from the direction opposite to the arrow X direction in FIG. 4). It is a figure which shows the structure of the conventional ball screw apparatus, (a) is a top view, (b) is the figure which looked at the circulation component from the axial direction of the screw shaft. It is the figure which shows the division body of the conventional circulation component, (a) is the figure which looked at the circulation component of 2.5 turns from the flat surface direction of the nut, (b) is the view from the arrow Z direction of (a). (C) is the figure which looked at 1.5 parts of circulation parts from the flat surface direction of the nut, (d) is the figure seen from the arrow Z direction of (c).
- FIG. 1 is a plan view showing the configuration of the ball screw device of the present embodiment.
- FIG. 2 is a right side view of FIG.
- FIG. 3 is a perspective view showing a divided body of circulating parts of the ball screw device of the present embodiment.
- FIG. 4 is a view of the divided part of the circulating component of the ball screw device of this embodiment as viewed from the flat surface direction of the nut.
- 5A and 5B are diagrams showing the divided parts of the circulating parts of the ball screw device of the present embodiment, where FIG. 5A is a view seen from the direction of arrow Y in FIG. 4 and FIG. 5B is a view seen from the direction of arrow X in FIG.
- FIG. 3C is a view as seen from the axial direction of the screw shaft.
- the ball screw device 1 has a screw shaft 10 having a spiral thread groove 11 on the outer peripheral surface and a spiral screw groove 21 corresponding to the screw groove 11 on the inner peripheral surface.
- a nut 20 is fitted, and the screw groove 21 of the nut 20 and the screw groove 11 of the screw shaft 10 face each other to form a spiral track that receives a load therebetween.
- a large number of balls 30 as rolling elements are loaded on the spiral track so that the balls 30 can roll.
- the rotation of the screw shaft 10 (or nut 20) causes the nut 20 (or screw shaft 10) to roll the ball 30. It moves in the axial direction.
- a flat surface 20 a is formed on a part of the peripheral surface of the nut 20, and the circulating component 40 is fixed to the flat surface 20 a by a presser 50 with, for example, a set screw 60.
- the circulation component 40 includes a pair of leg portions 41 and a main body 42 that connects the pair of leg portions 41.
- the inside of the circulation component 40 is a ball circulation path R, and is point-symmetric along the path direction of the ball circulation path R.
- the divided body 40a (see FIG. 3) divided into two parts is joined to each other at the dividing surface, and a circulation groove 43 constituting a ball circulation path R is formed on the divided surface of the divided body 40a. Accordingly, the circulating component 40 can be easily assembled by joining two divided bodies 40a having the same shape, and the cost can be reduced because only one type of mold is required for the divided body 40a.
- two circulation parts 40 are arranged to form two circulation circuits.
- the pair of leg portions 41 are arranged to be separated from each other in the axial direction of the screw shaft 10 and to be separated from each other in the radial direction of the screw shaft 10.
- a tongue portion 44 that scoops up the ball 30 rolling on the spiral trajectory in a direction substantially coinciding with the tangential direction of the spiral trajectory.
- leg portions 41 are fitted into a pair of circulation holes 22 that are communicated with the spiral track between the thread grooves 11 and 21 and are drilled in the flat surface 20a of the nut 20 in a direction substantially perpendicular to the axis of the nut 20.
- the pair of circulation holes 22 are arranged with their axial centers spaced apart from the axis of the screw shaft 10 by the same dimension in opposite directions.
- the escape part 45 (refer FIG. 3) is formed so that the front-end
- the ball circulation path R in the circulation component 40 refers to the leg 41 of one of the pair of legs 41 with reference to FIGS. 5 (b) and 5 (c).
- a first direction for guiding the traveling direction of the ball 30 scooped up from the spiral trajectory by the tongue portion 44 is the direction of the outside of the nut 20 and substantially coincides with the axial direction of the circulation hole 22 or has a predetermined angle.
- a bending portion R1, a second bending portion R2 that guides the ball 30 that has passed through the first bending portion R1 in the direction of the other leg portion 41, and a ball 30 that has passed through the second bending portion R2.
- a third bending portion R3 that leads to the inside of the other leg portion 41 through the main body 42, and a ball 30 that has passed through the third bending portion R3 is led to the position of the tongue portion 44 of the other leg portion 41. 4 curved portions R4.
- the circulating component 40 is divided into two symmetrically along the path direction of the ball circulation path R at a position avoiding the tongues 44 of the pair of leg portions 41.
- the first divided surface A and the first divided surface C that divide the leg portion 41 among the divided surfaces of the circulating component 40 are: A plane including the central axis of the ball circulation path R in the first curved part R1 and the fourth curved part R4 (a plane including a normal line group of the central axis of the ball circulation path R in each curved part: FIG. 5B) It is divided so as to be substantially orthogonal to the surface along the paper surface).
- the second divided surface B that divides the body 42 of the split surface of the circulating member 40 (divided body 40a) has a dividing plane B 1 and dividing plane B 2.
- Each of the dividing surface B 1 and the dividing surface B 2 passes through the path center 72 in FIG. 5A and divides the dividing surface A and the dividing surface C in a connecting direction.
- reference numeral 70 is a ball scooping position of one leg
- 71 is a ball scooping position of the other leg
- 72 is an intermediate point of the ball circulation path R
- 73 is a ball circulation path R.
- the central axis of K, K is the ball center locus in the spiral orbit (load zone).
- the ball scooping position 71 functions as a ball return position
- the ball scooping position 70 functions as a ball return position.
- a case where the ball 30 is scooped up on one leg 41 side will be described.
- the ball circulation path R in the circulation component 40 will be described along the progress of the ball 30.
- the screw shaft 10 is rotating clockwise by the arrow view from the axial direction.
- the ball 30 that has been rolling between the screw grooves 11 and 21 in the spiral track that is the load zone is rolled up in a substantially tangential direction of the spiral track by the tongue portion 44 at the ball lifting position 70 of one leg portion 41. And then enters the ball circulation path R.
- ⁇ in FIG. 5C is an apparent scooping angle for obtaining the load capacity, and is in the range of 0 ⁇ ⁇ 90 ° (substantially about 20 to 45 °).
- the ball 30 that has entered the ball circulation path R from the ball scooping position 70 has a traveling direction substantially the same as the axial direction of the circulation hole 22 along the first curved portion R1 in the ball circulation path R, that is, circulation.
- the direction of the main body 42 of the component 40 is changed.
- the circulation path from the intermediate point 72 of the ball circulation path R to the third curving portion R3 and the fourth curving portion R4 and further to the ball scooping position 71 of the other leg 41 is one ball scooping position 70. To the intermediate point 72 of the ball circulation path R.
- the ball circulation path R in the circulation component 40 indicates that the traveling direction of the ball 30 scooped up from the spiral track by the tongue portion 44 of one leg portion 41 of the pair of leg portions 41 is outside the nut 20.
- the first curved portion R1 (or the fourth curved portion R4) that leads in a direction that substantially coincides with the axial direction of the circulation hole, so that the first curved portion R1 (or the fourth curved portion R4) is provided.
- the circulation hole 22 can be made smaller, so that the apparent increase to obtain the load capacity without unnecessarily increasing the circulation hole 22 is achieved.
- the traveling direction of the ball 30 after passing through the first curved portion R1 does not necessarily have to be a direction along the axis of the circulation hole 22, and the first curved portion R1 and the second curved portion R2 Or the inflection point of each bending portion, and between the third bending portion R3 and the fourth bending portion R4 or at the inflection point of each bending portion, the traveling direction of the ball 30 and the axis of the circulation hole 22 It may be tilted so that the angle formed is in the range of 0 ° or more and less than the apparent scooping angle ⁇ .
- the traveling direction of the ball 30 (the direction of the ball circulation path R) at the time when the passage of the first curved portion R1 is finished is inclined with respect to the axis of the circulation hole 22 of the nut 20, thereby
- the bending R of the bending portion R1 and the second bending portion R2 can be made larger, whereby the centrifugal force of the ball 30 when the ball 30 passes is reduced, and the circulating component 40 is worn or damaged by the centrifugal force. Can be prevented, and the circulation of the balls 30 can be made smoother.
- the circulation hole 22 of the nut 20 may be a round hole, but is a hole having a length dimension larger than a width dimension such as an oval or an ellipse, and the longitudinal direction thereof substantially follows the spiral trajectory between the thread grooves 11 and 21. It is preferable that it is the direction.
- the circulation hole 22 is adjacent to the load zone. Interference with the thread groove 21 can be prevented.
- each of the divided surfaces of the divided bodies 40 a and 40 a obtained by dividing the circulating component 40 into two along the direction of the ball circulation path R includes one end of the main body 42. It has the 1st division surface A of the leg part 41, the 1st division surface C of the other leg part 41 including the edge part of the main body 42, and the 2nd division surface B of the intermediate part of the main body 42. Become.
- the first dividing surface A is a plane including the central axis of the ball circulation path R of the first curved portion R1 (a plane including a normal line group of the central axis of the ball circulation path R in the curved portion R1: FIG. 5B). It is a plane that is substantially orthogonal to the plane of the sheet. Thereby, the 1st division
- segmentation surface A does not divide the leg part 41 connected to the tongue part 44 and the tongue part 44 unevenly, and can prevent the strength reduction of the tongue part 44.
- the first divided surface C is a surface in contact with the first divided surface A when the two divided bodies 40a are joined point-symmetrically.
- the second divided surface B is a surface connecting the first divided surface A and the first divided surface C, and the second divided surface B is in a state where the circulating component 40 is fixed to the flat surface 20 a of the nut 20. It is constituted by a dividing plane B 2 of the upper side of the dividing plane B 1 and a lower side that intersect each other when viewed from the direction of the flat surface 20a.
- the dividing plane B 1 includes the central axis of the ball circulation path R.
- One or both of the dividing surface B 1 and the dividing surface B 2 (one in this example) and the ball center locus 73 in the ball circulation path R intersect each other at an intermediate point 72 of the ball circulation path R.
- the intersecting angle ⁇ between the dividing surface B 1 and the dividing surface B 2 is more than 0 ° and less than 90 °, and preferably 45 ° or less.
- the dividing plane B 1 coincides with the central axis 73 of the ball circulation path R.
- the second split surface B is configured to intersect each other when the split surface between the upper part and the lower part of the ball circulation path R is viewed from the direction of the flat surface 20a of the nut 20, so that the lead angle and the number of circulation turns Even if the ball screw device is small, the shape of the periphery can be ensured without dividing the tongue portion 44 and the leg portion 41 connected to the tongue portion 44 as unevenly as possible. Can be ensured, and the plane of the upper surface of the main body 42 is divided substantially evenly, and the fixing pressure of the circulating component 40 is made substantially uniform over the entire fixing region, so that the elastic deformation at the time of fixing becomes substantially equal, and the ball 30 Can be smoothly circulated.
- the circulating component 40 having such a configuration has a particularly remarkable effect when applied to, for example, a ball screw device having a lead angle of 4 ° or less and a winding number of less than 2.5.
- a bent portion 80 may be provided at the base of 44.
- the bent part 80 can divide the circulating component 40 without having a strong anxiety around the tongue 44.
- a bent portion 81 is also provided on the first divided surface C side so as not to interfere with the bent portion 80 of the first divided surface A.
- this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.
- the circulating component 40 is fixed to the flat surface 20a of the nut 20 via the presser 50, but the circulating component 40 is attached to the flat surface 20a of the nut 20 without using the presser 50. You may fix directly with a set screw etc.
- the material, shape, dimensions, form, number, location, etc. of the third curved portion and the fourth curved portion are arbitrary and are not limited as long as the object of the present invention can be achieved.
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Abstract
Description
そこで、このようなタング部の分割を回避するために、特許文献2に記載のボールねじ装置が開示されている。
前記循環部品は、両端部に前記ナットの前記循環孔に嵌合されると共に、各先端に前記螺旋軌道を転動する前記ボールを該螺旋軌道の接線方向に略一致する方向に掬い上げるタング部を有する一対の脚部と、該一対の脚部を接続する本体とを備え、
前記一対の脚部を前記ボール循環経路の経路方向に沿って分割する第1の分割面と、前記本体を前記ボール循環経路の経路方向に沿って分割する第2の分割面とを有し、該第2の分割面は、前記ボール循環経路の上部と下部との分割面が前記循環部品を前記ナットの平坦面方向から見た場合に前記上部の分割面と前記下部の分割面とが交差するように形成されている。
図1は、本実施形態のボールねじ装置の構成を示す平面図である。図2は図1の右側面図である。図3は本実施形態のボールねじ装置の循環部品の分割体を示す斜視図である。図4は本実施形態のボールねじ装置の循環部品の分割体をナットの平坦面方向から見た図である。図5は本実施形態のボールねじ装置の循環部品の分割体を示す図であり、(a)は図4の矢印Y方向から見た図、(b)は図4の矢印X方向から見た図、(c)はねじ軸の軸方向から見た図である。
図1及び図2に示すように、ボールねじ装置1は、外周面に螺旋状のねじ溝11を有するねじ軸10に、内周面にねじ溝11に対応する螺旋状のねじ溝21を有するナット20が嵌合されており、ナット20のねじ溝21とねじ軸10のねじ溝11とは互いに対向して両者の間に負荷を受ける螺旋軌道を形成している。
ナット20の周面の一部には、平坦面20aが形成されており、該平坦面20aには循環部品40が押え具50によって例えば止めねじ60等によって固定されている。
これにより、同一形状の2つの分割体40aを接合することで容易に循環部品40を組み立てることができると共に、分割体40aの成形型も一種類で済むためコスト低減を図ることができる。なお、この実施の形態では、循環部品40を2つ配置して2つの循環回路を形成している。
そして、この循環部品40によって、ねじ溝11,21間の螺旋軌道を転動するボール30を一方の脚部41から掬い上げてナット20外部の本体42内に導き、他方の脚部41から上記の螺旋軌道に戻すボールの無限循環軌道を形成している。
以下、図3~図5を参照して循環部品(分割体)について詳述する。なお、図4及び図5において、符号70は一方の脚部のボール掬い上げ位置、71は他方の脚部のボール掬い上げ位置、72はボール循環経路Rの中間点、73はボール循環経路Rの中心軸線、Kは螺旋軌道(負荷圏)でのボール中心軌跡である。ここで、ボール30が一方の脚部41側で掬い上げられる場合には、ボール掬い上げ位置71がボール戻し位置として機能し、ボール30が他方の脚部41側で掬い上げられる場合には、ボール掬い上げ位置70がボール戻し位置として機能する。)以下、ボール30が一方の脚部41側で掬い上げられる場合について説明する。
負荷圏である螺旋軌道においてねじ溝11,21間を転動していたボール30は、一方の脚部41のボール掬い上げ位置70にてタング部44によって螺旋軌道の略接線方向に掬い上げられて螺旋軌道から外れ、ボール循環経路R内に進入する。
ボール掬い上げ位置70からボール循環経路Rに進入したボール30は、ボール循環経路R内の第1の湾曲部R1に沿ってその進行方向を循環孔22の軸線方向と略同一方向、即ち、循環部品40の本体42の方向へと向きを変える。
ボール循環経路Rの中間点72から第3の湾曲部R3及び第4の湾曲部R4、更に他方の脚部41のボール掬い上げ位置71へ達するまでの循環経路は、一方のボール掬い上げ位置70からボール循環経路Rの中間点72までの経路の点対称形状となる。
このような循環孔22とすることで、リードが小さいボールねじ装置や多条のボールねじ装置のように互いに隣り合うねじ溝21が近接したボールねじ装置でも、循環孔22が隣接する負荷圏のねじ溝21に干渉するのを防止することができる。
次に、上述したボール循環経路Rを有する循環部品40、及び該循環部品40を構成する分割体40aの構成について説明する。
図3及び図4に示すように、循環部品40をボール循環経路Rの方向に沿って2つに分割された分割体40a,40aのそれぞれの分割面は、本体42の端部を含む一方の脚部41の第1の分割面Aと、本体42の端部を含む他方の脚部41の第1の分割面Cと、本体42の中間部の第2の分割面Bとを有してなる。
第1の分割面Aは、第1の湾曲部R1のボール循環経路Rの中心軸線を含む平面(湾曲部R1においてボール循環経路Rの中心軸線の法線群を含む平面:図5(b)の紙面に沿う面)と略直交する平面となっている。これにより、第1の分割面Aはタング部44及びタング部44に接続した脚部41を不均等に分割することがなく、該タング部44の強度低下を防止することができる。そして、第1の分割面Cは、2つの分割体40aを点対称に接合したとき、第1の分割面Aと接する面となっている。
第2の分割面Bは、第1の分割面Aと第1の分割面Cを繋ぐ面であり、第2の分割面Bは、循環部品40をナット20の平坦面20aに固定した状態で平坦面20aの方向から見た場合に互いに交差する上部側の分割面B1及び下部側の分割面B2とにより構成されている。また、図示例では、分割面B1はボール循環経路Rの中心軸線を含んでいる。分割面B1及び分割面B2の一方又は両方(この例では一方)と、ボール循環経路R内のボール中心軌跡73とが、該ボール循環経路Rの中間点72においてそれぞれ交差している。分割面B1と分割面B2との交差角度Φは、0°超90°未満であり、45°以下が好ましい。なお、図示例では、分割面B1がボール循環経路Rの中心軸線73と一致している。
例えば、上記実施の形態では、循環部品40を、押え具50を介してナット20の平坦面20aに固定しているが、押え具50を用いずに循環部品40をナット20の平坦面20aに止めねじ等によって直接固定してもよい。
10 ねじ軸
11 ねじ溝
20 ナット
21 ねじ溝
22 循環孔
30 ボール
40 循環部品
41 脚部
42 本体
R ボール循環経路
R1 第1の湾曲部
R2 第2の湾曲部
R3 第3の湾曲部
R4 第4の湾曲部
A 第1の分割面
B 第2の分割面
B1 第2の分割面Bにおけるボール循環経路Rの上部側の分割面
B2 第2の分割面Bにおけるボール循環経路Rの下部側の分割面
C 第1の分割面
Claims (1)
- 外周面に螺旋状のねじ溝を有するねじ軸と、該ねじ軸の前記ねじ溝に対応する螺旋状のねじ溝を内周面に有して前記ねじ軸に螺合されるナットと、前記両ねじ溝間の螺旋軌道に転動可能に装填された多数のボールと、前記螺旋軌道を転動する前記ボールを、前記ナットの周方向の側面に形成された平坦面に該ナットの軸線に対して略直交する方向に穿孔された一対の循環孔の内の一方の循環孔から該ナットの外部に導き、他方の循環孔から前記螺旋軌道に戻すボール循環経路を内部に形成すべく前記各循環孔に両端部が嵌合された循環部品とを備え、
前記循環部品は、両端部に前記ナットの前記循環孔に嵌合されると共に、各先端に前記螺旋軌道を転動する前記ボールを該螺旋軌道の接線方向に略一致する方向に掬い上げるタング部を有する一対の脚部と、該一対の脚部を接続する本体とを備え、
前記一対の脚部を前記ボール循環経路の経路方向に沿って分割する第1の分割面と、前記本体を前記ボール循環経路の経路方向に沿って分割する第2の分割面とを有し、該第2の分割面は、前記ボール循環経路の上部と下部との分割面が前記循環部品を前記ナットの平坦面方向から見た場合に前記上部の分割面と前記下部の分割面とが交差するように形成されていることを特徴とするボールねじ装置。
Priority Applications (4)
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JP2012547669A JP5500268B2 (ja) | 2010-12-08 | 2011-02-03 | ボールねじ装置 |
EP11702382.0A EP2650563B1 (en) | 2010-12-08 | 2011-02-03 | Ball screw device |
CN201180000030.7A CN102652232B (zh) | 2010-12-08 | 2011-02-03 | 滚珠丝杠装置 |
US13/059,512 US9003911B2 (en) | 2010-12-08 | 2011-02-03 | Ball screw device |
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JP2010273685 | 2010-12-08 | ||
JP2010-273685 | 2010-12-08 |
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EP (1) | EP2650563B1 (ja) |
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JP5500268B2 (ja) * | 2010-12-08 | 2014-05-21 | 日本精工株式会社 | ボールねじ装置 |
JP6257352B2 (ja) * | 2014-01-31 | 2018-01-10 | Thk株式会社 | ボールねじ |
JP5818925B2 (ja) * | 2014-02-13 | 2015-11-18 | Thk株式会社 | ボールねじ装置 |
KR101747646B1 (ko) * | 2014-08-12 | 2017-06-14 | 구로다 세이코 가부시키가이샤 | 볼 나사 |
DE102015214856B4 (de) * | 2015-08-04 | 2017-07-06 | Schaeffler Technologies AG & Co. KG | Kugelgewindetrieb |
CN109937316B (zh) * | 2016-11-14 | 2022-09-13 | 日本精工株式会社 | 滚珠丝杠 |
CN108386506A (zh) * | 2017-01-24 | 2018-08-10 | 上银科技股份有限公司 | 外循环式滚珠螺杆 |
CN107806498A (zh) * | 2017-11-08 | 2018-03-16 | 山东交通学院 | 一种电磁减振器丝杠装置 |
US11680628B2 (en) * | 2020-04-02 | 2023-06-20 | Nsk Ltd. | Ball screw device |
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Also Published As
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EP2650563A4 (en) | 2016-09-07 |
CN102652232A (zh) | 2012-08-29 |
JPWO2012077247A1 (ja) | 2014-05-19 |
US9003911B2 (en) | 2015-04-14 |
EP2650563A1 (en) | 2013-10-16 |
CN102652232B (zh) | 2015-01-21 |
EP2650563B1 (en) | 2020-03-25 |
US20130239725A1 (en) | 2013-09-19 |
JP5500268B2 (ja) | 2014-05-21 |
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