JP5012832B2 - Ball screw and ball screw device having the same - Google Patents

Ball screw and ball screw device having the same Download PDF

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JP5012832B2
JP5012832B2 JP2009037074A JP2009037074A JP5012832B2 JP 5012832 B2 JP5012832 B2 JP 5012832B2 JP 2009037074 A JP2009037074 A JP 2009037074A JP 2009037074 A JP2009037074 A JP 2009037074A JP 5012832 B2 JP5012832 B2 JP 5012832B2
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大輔 黒岩
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Description

本発明は、工作機械等に用いるボールねじ及びそれを備えたボールねじ装置に関する。   The present invention relates to a ball screw used for a machine tool or the like and a ball screw device including the ball screw.

従来から、工作機械等が備えるボールねじとして、例えば、特許文献1に記載のボールねじがある。
特許文献1に記載のボールねじは、図13及び図14中に示すように、ねじ軸4と、ナット8と、複数のボール10と、ボール循環部品12を備えている。なお、図13は、従来例のボールねじ1を示す図である。また、図14は、図13のXIV線矢視図である。
ねじ軸4は、螺旋状のねじ軸側軌道溝16を外周面に有している。
ナット8は、ねじ軸4の外周側に配置されるとともに、ねじ軸側軌道溝16に対向するナット側軌道溝18を内周面に有している。また、ナット8には、ねじ軸4の軸方向に延在するボール戻り路20が形成されている。
Conventionally, as a ball screw with which a machine tool etc. are provided, there exists a ball screw of patent documents 1, for example.
As shown in FIGS. 13 and 14, the ball screw described in Patent Document 1 includes a screw shaft 4, a nut 8, a plurality of balls 10, and a ball circulation component 12. FIG. 13 is a view showing a conventional ball screw 1. FIG. 14 is a view taken along the line XIV in FIG.
The screw shaft 4 has a spiral screw shaft side raceway groove 16 on the outer peripheral surface.
The nut 8 is disposed on the outer peripheral side of the screw shaft 4 and has a nut-side track groove 18 facing the screw shaft-side track groove 16 on the inner peripheral surface. Further, a ball return path 20 extending in the axial direction of the screw shaft 4 is formed in the nut 8.

複数のボール10は、ねじ軸側軌道溝16とナット側軌道溝18との間に形成される負荷転動路26内に、転動自在に装填されており、これらのボール10は、ねじ軸4またはナット8の回転運動に伴って、負荷転動路26内を転動する。
ボール循環部品12は、ナット8の両端部に配置されており、負荷転動路26内からすくい上げ、そのすくい上げたボール10を、ボール戻り路20を介して負荷転動路26内へ戻す。これにより、複数のボール10は、ねじ軸4またはナット8の回転運動に伴って、負荷転動路26内を無限循環する。
また、ボール循環部品12は、循環部品固定部材14を用いて、ナット8の両端部に固定されている。
The plurality of balls 10 are slidably loaded in a load rolling path 26 formed between the screw shaft side raceway groove 16 and the nut side raceway groove 18. 4 or the nut 8 rolls in the load rolling path 26 as the nut 8 rotates.
The ball circulation parts 12 are arranged at both ends of the nut 8 and scoop up from the load rolling path 26 and return the scooped ball 10 into the load rolling path 26 through the ball return path 20. Thereby, the plurality of balls 10 circulate infinitely in the load rolling path 26 as the screw shaft 4 or the nut 8 rotates.
The ball circulation component 12 is fixed to both ends of the nut 8 using a circulation component fixing member 14.

循環部品固定部材14は、ねじ軸4の軸方向から見て、ナット8の端面と対向する円環状に形成されており、ボール循環部品12と一体に形成されている。具体的には、図15及び図16中に示すように、ボール循環部品12は、循環部品固定部材14のナット8と対向する面に配置されている。なお、図15は、従来例のボールねじ1が備えるボール循環部品12及び循環部品固定部材14を、ねじ軸4の軸方向から見た図である。また、図16は、図15のXVI線矢視図である。   The circulating component fixing member 14 is formed in an annular shape facing the end surface of the nut 8 when viewed from the axial direction of the screw shaft 4, and is formed integrally with the ball circulating component 12. Specifically, as shown in FIGS. 15 and 16, the ball circulation component 12 is disposed on the surface of the circulation component fixing member 14 facing the nut 8. FIG. 15 is a view of the ball circulating component 12 and the circulating component fixing member 14 provided in the conventional ball screw 1 as viewed from the axial direction of the screw shaft 4. FIG. 16 is a view taken along line XVI in FIG.

特開2003−240093号公報JP 2003-240093 A

ところで、工作機械等、上記のようなボールねじを備えるボールねじ装置は、例えば、複数のボールねじを並列に配置して形成する場合がある。この場合、ナットを径方向に小型化することにより、隣り合うボールねじ同士の間隔(軸間寸法)を減少させることが可能となるため、工作機械等を形成する機台を小型化することが可能となる。また、ナットを径方向に小型化することにより、ナットの質量を減少させることが可能となるため、ボールねじ装置の駆動に用いるモータ等の動力源を、小型化することが可能となる。   Incidentally, a ball screw device including the above-described ball screw such as a machine tool may be formed by arranging a plurality of ball screws in parallel, for example. In this case, by reducing the size of the nut in the radial direction, it is possible to reduce the interval (interaxial dimension) between adjacent ball screws, so that the machine base forming the machine tool or the like can be reduced in size. It becomes possible. Further, by reducing the size of the nut in the radial direction, the mass of the nut can be reduced, so that the power source such as a motor used for driving the ball screw device can be reduced in size.

しかしながら、特許文献1に記載のボールねじでは、循環部品固定部材が、ねじ軸の軸方向から見て、円環状に形成されている。このため、ナットを、ねじ軸の軸方向から見て、循環部品固定部材の外径よりも径方向に小型化することができないという問題が生じる。この問題は、具体的には、ねじ軸の軸方向から見て、ナットの最小幅を、循環部品固定部材の外径未満とすることができないという問題である。
本発明は、上記のような問題点に着目してなされたもので、ねじ軸の軸方向から見たナットの幅を減少させて、ナットを径方向に小型化することが可能な、ボールねじ及びそれを備えたボールねじ装置を提供することを課題とする。
However, in the ball screw described in Patent Document 1, the circulating component fixing member is formed in an annular shape when viewed from the axial direction of the screw shaft. For this reason, there is a problem that the nut cannot be downsized in the radial direction rather than the outer diameter of the circulating component fixing member when viewed from the axial direction of the screw shaft. Specifically, this problem is a problem that the minimum width of the nut cannot be made smaller than the outer diameter of the circulating component fixing member when viewed from the axial direction of the screw shaft.
The present invention has been made paying attention to the above-described problems, and can reduce the nut width in the radial direction by reducing the width of the nut as viewed from the axial direction of the screw shaft. It is another object of the present invention to provide a ball screw device including the same.

上記課題を解決するために、本発明のうち、請求項1に記載した発明は、螺旋状のねじ軸側軌道溝を外周面に有するねじ軸と、前記ねじ軸側軌道溝に対向するナット側軌道溝が内周面に形成され、且つボール戻り路が内部に形成されたナットと、前記両軌道溝間に形成される負荷転動路内に転動自在に装填され、且つ前記ねじ軸または前記ナットの回転運動に伴って前記負荷転動路内を転動する複数のボールと、前記ナットの端部に配置され、且つ前記負荷転動路と前記ボール戻り路とを連通するボール誘導路を有するボール循環部品と、を備えたボールねじであって、
前記ボール循環部品は、前記ねじ軸の軸方向から見て前記ナットの端部の一部のみと重なり、
前記ボール循環部品を間に挟んで前記ナットの端部に取り付けられて、前記ボール循環部品を前記ナットの端部に固定する板状の循環部品固定部材を備え、
前記循環部品固定部材は、前記ねじ軸の軸方向から見て、前記ボール循環部品の少なくとも一部と重なる固定部材側循環部品押え部と、当該固定部材側循環部品押え部から突出するとともに前記ナットの端部の一部と重なる固定部材側循環部品固定部と、を備え、
前記ナットは、前記ねじ軸の軸方向から見て、前記循環部品固定部材及び前記ナット側軌道溝と重なる部分以外の少なくとも一部が、前記循環部品固定部材と重なる部分よりも、前記ねじ軸の中心からの距離が短いことを特徴とするものである。
In order to solve the above-mentioned problems, among the present inventions, the invention described in claim 1 is a screw shaft having a helical screw shaft side raceway groove on an outer peripheral surface, and a nut side facing the screw shaft side raceway groove. A raceway groove is formed on the inner peripheral surface, and a ball return path is formed inside, and a load rolling path formed between the raceway grooves is movably loaded, and the screw shaft or A plurality of balls that roll in the load rolling path as the nut rotates, and a ball guide path that is disposed at an end of the nut and communicates with the load rolling path and the ball return path. A ball screw comprising:
The ball circulation component overlaps only a part of the end of the nut as viewed from the axial direction of the screw shaft,
A plate-like circulation component fixing member that is attached to the end of the nut with the ball circulation component in between, and fixes the ball circulation component to the end of the nut;
The circulating component fixing member, as viewed from the axial direction of the screw shaft, protrudes from the fixing member-side circulating component pressing portion that overlaps at least a part of the ball circulating component, and protrudes from the fixing member-side circulating component pressing portion and the nut A fixed member-side circulating component fixing part that overlaps a part of the end of
When viewed from the axial direction of the screw shaft, the nut has at least a portion other than the portion overlapping the circulating component fixing member and the nut side raceway groove than the portion overlapping the circulating component fixing member. The distance from the center is short.

本発明によると、循環部品固定部材が、ねじ軸の軸方向から見て、ボール循環部品の少なくとも一部と重なる固定部材側循環部品押え部と、固定部材側循環部品押え部から突出するとともにナットの端部の一部と重なる固定部材側循環部品固定部を備えている。これに加え、ナットが、ねじ軸の軸方向から見て、循環部品固定部材及びナット側軌道溝と重なる部分以外の少なくとも一部が、循環部品固定部材と重なる部分よりも、ねじ軸の中心からの距離が短い形状である。
このため、循環部品固定部材を、ボール循環部品をナットの端部に固定するための部分を残して、ナットの径方向に縮小させることが可能となる。
これにより、ナットの形状を、循環部品固定部材を取り付けるための部分と、ボールを転動させるための部分を残して、ナットの径方向に縮小させた形状とすることが可能となるため、ねじ軸の軸方向から見たナットの幅を減少させることが可能となる。
According to the present invention, the circulating component fixing member protrudes from the fixed member-side circulating component pressing portion that overlaps at least a part of the ball circulating component, as viewed from the axial direction of the screw shaft, and the fixing member-side circulating component pressing portion, and the nut A fixed member-side circulating component fixing portion that overlaps a part of the end portion of the fixing member. In addition, when the nut is viewed from the axial direction of the screw shaft, at least a part other than the portion overlapping the circulating component fixing member and the nut-side raceway groove is closer to the center of the screw shaft than the portion overlapping the circulating component fixing member. This is a shape with a short distance.
For this reason, the circulating component fixing member can be reduced in the radial direction of the nut, leaving a portion for fixing the ball circulating component to the end of the nut.
This allows the nut shape to be reduced in the radial direction of the nut, leaving a portion for attaching the circulating component fixing member and a portion for rolling the ball. The width of the nut viewed from the axial direction of the shaft can be reduced.

次に、本発明のうち、請求項2に記載した発明は、請求項1に記載した発明であって、前記循環部品固定部材は、前記ナットとナットの径方向で対向する固定部材側対向部を備え、
前記ナットは、前記循環部品固定部材と前記ナットの径方向で対向するナット側対向部を備え、
前記固定部材側対向部に、前記ねじ軸の軸方向から見て前記ナット側へ突出する固定部材側凸部を形成し、
前記ナット側対向部に、前記固定部材側凸部が嵌合するナット側凹部を形成したことを特徴とするものである。
Next, among the present inventions, the invention described in claim 2 is the invention described in claim 1, wherein the circulating component fixing member is a fixing member side facing portion that faces the nut in the radial direction of the nut. With
The nut includes a nut-side facing portion that faces the circulating component fixing member in the radial direction of the nut,
A fixing member side convex portion that protrudes toward the nut side when viewed from the axial direction of the screw shaft is formed on the fixing member side facing portion,
A nut-side concave portion into which the fixing member-side convex portion is fitted is formed in the nut-side facing portion.

本発明によると、固定部材側対向部に形成した固定部材側凸部を、ナット側対向部に形成したナット側凹部に嵌合させることにより、循環部品固定部材をナットの端部へ取り付けることが可能となる。
このため、循環部品固定部材をナットの端部へ取り付けた状態で、循環部品固定部材に、ナットの周方向や径方向への外力が加わった場合でも、循環部品固定部材がナットの端部から外れることを抑制することが可能となる。
According to the present invention, it is possible to attach the circulating component fixing member to the end portion of the nut by fitting the fixing member side convex portion formed on the fixing member side facing portion to the nut side concave portion formed on the nut side facing portion. It becomes possible.
For this reason, even when an external force is applied to the circulating component fixing member in the circumferential direction or radial direction of the nut with the circulating component fixing member attached to the end of the nut, the circulating component fixing member is removed from the end of the nut. It is possible to suppress detachment.

次に、本発明のうち、請求項3に記載した発明は、請求項2に記載した発明であって、前記循環部品固定部材は、前記固定部材側対向部の少なくとも一部を弾性変形させて前記固定部材側凸部を前記ナットの径方向に沿って前記ねじ軸側へ変位可能な固定部材側弾性変形部を備えることを特徴とするものである。
本発明によると、循環部品固定部材をナットの端部へ取り付ける際に、固定部材側弾性変形部を弾性変形させることにより、固定部材側凸部を、ナットの径方向にねじ軸側へ変位させることが可能となる。
このため、循環部品固定部材をナットの端部へ取り付ける際に、固定部材側凸部を、ナット側凹部よりもねじ軸側へ変位させることが可能となり、固定部材側凸部をナット側凹部へ嵌合させる作業が容易となる。
Next, of the present invention, the invention described in claim 3 is the invention described in claim 2, wherein the circulating component fixing member elastically deforms at least a part of the fixing member side facing portion. The fixing member side convex portion is provided with a fixing member side elastic deformation portion capable of being displaced toward the screw shaft side along the radial direction of the nut.
According to the present invention, when the circulating component fixing member is attached to the end portion of the nut, the fixing member side convex portion is displaced in the radial direction of the nut toward the screw shaft side by elastically deforming the fixing member side elastic deformation portion. It becomes possible.
For this reason, when attaching the circulating component fixing member to the end portion of the nut, it becomes possible to displace the fixing member side convex portion to the screw shaft side rather than the nut side concave portion, and the fixing member side convex portion to the nut side concave portion. The mating operation becomes easy.

次に、本発明のうち、請求項4に記載した発明は、請求項3に記載した発明であって、前記固定部材側弾性変形部を、前記循環部品固定部材のうち前記ねじ軸の軸方向から見て前記ボール循環部品と重なる部分の一部を貫通する開口部とし、
前記循環部品固定部材の前記固定部材側凸部と前記固定部材側弾性変形部との間の部分のうち、前記ねじ軸の軸方向から見て前記ボール循環部品と重なる部分の前記ナットの径方向に沿った最大長さを、0.5mm以上としたことを特徴とするものである。
本発明によると、ボール循環部品を通過するボールによって衝撃が加わったボール循環部品が、循環部品固定部材をナットの端面から外れる方向へ押圧しても、ボール循環部品が循環部品固定部材へ加える押圧力を抑制することが可能となる。
このため、ボールねじの作動時において、循環部品固定部材の変形を抑制することが可能となり、循環部品固定部材のナットの端面からの脱落を抑制することが可能となる。
Next, of the present invention, the invention described in claim 4 is the invention described in claim 3, wherein the fixing member side elastically deforming portion is connected to the axial direction of the screw shaft of the circulating component fixing member. An opening that penetrates a part of the portion that overlaps the ball circulation component as viewed from
The radial direction of the nut of the portion of the circulating component fixing member that overlaps the ball circulating component when viewed from the axial direction of the screw shaft, of the portion between the fixing member side convex portion and the fixing member side elastic deformation portion The maximum length along the line is 0.5 mm or more.
According to the present invention, even when a ball circulating component that has been impacted by a ball passing through the ball circulating component presses the circulating component fixing member in a direction away from the end face of the nut, the ball circulating component is applied to the circulating component fixing member. The pressure can be suppressed.
For this reason, it becomes possible to suppress the deformation of the circulating component fixing member during the operation of the ball screw, and it is possible to suppress the falling of the circulating component fixing member from the end face of the nut.

次に、本発明のうち、請求項5に記載した発明は、請求項1から4のうちいずれか1項に記載した発明であって、前記循環部品固定部材を、樹脂材料を用いて形成し、
前記循環部品固定部材の前記ねじ軸と対向する部分の少なくとも一部に、前記ねじ軸側軌道溝と接触する循環部品固定部材側シール部を形成したことを特徴とするものである。
本発明によると、樹脂材料を用いて形成した循環部品固定部材の、ねじ軸と対向する部分の少なくとも一部に、ねじ軸側軌道溝と接触する循環部品固定部材側シール部を形成する。
このため、循環部品固定部材とねじ軸側軌道溝との間に形成される隙間の少なくとも一部を、循環部品固定部材側シール部で閉塞することが可能となり、負荷転動路内への異物の侵入を抑制することが可能となる。
Next, among the present inventions, the invention described in claim 5 is the invention described in any one of claims 1 to 4, wherein the circulating component fixing member is formed using a resin material. ,
A circulating part fixing member side seal portion that contacts the screw shaft side raceway groove is formed in at least a part of a portion of the circulating part fixing member that faces the screw shaft.
According to the present invention, the circulating component fixing member side seal portion that contacts the screw shaft side raceway groove is formed on at least a part of the portion facing the screw shaft of the circulating component fixing member formed using the resin material.
For this reason, at least a part of the gap formed between the circulating component fixing member and the screw shaft side raceway groove can be closed with the circulating component fixing member side seal portion, and foreign matter into the load rolling path can be blocked. It becomes possible to suppress the intrusion of.

次に、本発明のうち、請求項6に記載した発明は、螺旋状のねじ軸側軌道溝を外周面に有するねじ軸と、前記ねじ軸側軌道溝に対向するナット側軌道溝が内周面に形成され、且つボール戻り路が内部に形成されたナットと、前記両軌道溝間に形成される負荷転動路内に転動自在に装填され、且つ前記ねじ軸または前記ナットの回転運動に伴って前記負荷転動路内を転動する複数のボールと、前記ナットの端部に配置され、且つ前記負荷転動路と前記ボール戻り路とを連通するボール誘導路を有するボール循環部品と、潤滑剤を含有し、且つ含有した潤滑剤を前記ねじ軸の外周面へ供給する円環状の潤滑剤供給体と、当該潤滑剤供給体を収容して前記ナットの端部側へ着脱可能に取り付ける略円筒状の潤滑剤供給体着脱部材と、を備えたボールねじであって、
前記ボール循環部品は、前記ねじ軸の軸方向から見て前記ナットの端部の一部のみと重なり、
前記潤滑剤供給体着脱部材を前記ナットの端部へ前記ボール循環部品を間に挟んで取り付けて、前記ボール循環部品を前記ナットの端部に固定し、
前記潤滑剤供給体着脱部材は、前記ねじ軸の軸方向から見て、前記ボール循環部品の少なくとも一部と重なる着脱部材側循環部品押え部と、当該着脱部材側循環部品押え部から突出するとともに前記ナットの端部の一部と重なる着脱部材側循環部品固定部と、を備え、
前記ナットは、前記ねじ軸の軸方向から見て、前記潤滑剤供給体着脱部材及び前記ナット側軌道溝と重なる部分以外の少なくとも一部が、前記潤滑剤供給体着脱部材と重なる部分よりも、前記ねじ軸の中心からの距離が短いことを特徴とするものである。
Next, among the present inventions, the invention described in claim 6 is characterized in that a screw shaft having a spiral screw shaft side raceway groove on the outer peripheral surface and a nut side raceway groove facing the screw shaft side raceway groove are provided on the inner periphery. A nut formed on the surface and having a ball return path formed therein, and a load rolling path formed between the both raceway grooves, and is rotatably loaded, and the rotary motion of the screw shaft or the nut Accordingly, a ball circulation part having a plurality of balls that roll in the load rolling path, and a ball guiding path that is disposed at an end of the nut and communicates the load rolling path and the ball return path. And an annular lubricant supply body that contains the lubricant and supplies the lubricant to the outer peripheral surface of the screw shaft, and can be attached to and detached from the end of the nut by accommodating the lubricant supply body And a substantially cylindrical lubricant supply member attaching / detaching member attached to the ball There is Flip,
The ball circulation component overlaps only a part of the end of the nut as viewed from the axial direction of the screw shaft,
The lubricant supply body attaching / detaching member is attached to the end portion of the nut with the ball circulation component interposed therebetween, and the ball circulation component is fixed to the end portion of the nut,
The lubricant supply body attaching / detaching member protrudes from the attaching / detaching member-side circulating component pressing portion that overlaps at least a part of the ball circulating component and the attaching / detaching member-side circulating component pressing portion as viewed from the axial direction of the screw shaft. A detachable member side circulating component fixing portion that overlaps a part of the end of the nut, and
When viewed from the axial direction of the screw shaft, the nut has at least a portion other than the portion overlapping the lubricant supply body attaching / detaching member and the nut side raceway groove than the portion overlapping the lubricant supply body attaching / detaching member, The distance from the center of the screw shaft is short.

本発明によると、潤滑剤供給体着脱部材が、ねじ軸の軸方向から見て、ボール循環部品の少なくとも一部と重なる着脱部材側循環部品押え部と、着脱部材側循環部品押え部から突出するとともにナットの端部の一部と重なる着脱部材側循環部品固定部を備える。これに加え、ナットが、ねじ軸の軸方向から見て、潤滑剤供給体着脱部材及びナット側軌道溝と重なる部分以外の少なくとも一部が、潤滑剤供給体着脱部材と重なる部分よりも、ねじ軸の中心からの距離が短い形状である。
このため、潤滑剤供給体着脱部材を、ボール循環部品をナットの端部に固定するための部分を残して、ナットの径方向に縮小させることが可能となる。
これにより、ナットの形状を、潤滑剤供給体着脱部材を取り付けるための部分と、ボールを転動させるための部分を残して、ナットの径方向に縮小させた形状とすることが可能となるため、ねじ軸の軸方向から見たナットの幅を減少させることが可能となる。
According to the present invention, the lubricant supply body attaching / detaching member protrudes from the attaching / detaching member-side circulating component pressing portion that overlaps at least a part of the ball circulating component and the attaching / detaching member-side circulating component pressing portion when viewed from the axial direction of the screw shaft. In addition, a detachable member-side circulating component fixing portion that overlaps a part of the end portion of the nut is provided. In addition to this, when the nut is viewed from the axial direction of the screw shaft, at least a part of the nut other than the portion overlapping the lubricant supply body attaching / detaching member and the nut side raceway groove is screwed more than the portion overlapping the lubricant supply body attaching / detaching member. The shape is short from the center of the shaft.
For this reason, the lubricant supply body attaching / detaching member can be reduced in the radial direction of the nut, leaving a portion for fixing the ball circulation component to the end of the nut.
As a result, the shape of the nut can be reduced in the radial direction of the nut, leaving a portion for attaching the lubricant supply body attaching / detaching member and a portion for rolling the ball. The width of the nut viewed from the axial direction of the screw shaft can be reduced.

次に、本発明のうち、請求項7に記載した発明は、請求項6に記載した発明であって、前記潤滑剤供給体着脱部材は、前記ナットとナットの径方向で対向する着脱部材側ナット対向部を備え、
前記ナットは、前記潤滑剤供給体着脱部材と前記ナットの径方向で対向するナット側対向部を備え、
前記着脱部材側ナット対向部に、前記ねじ軸の軸方向から見て前記ナット側へ突出する着脱部材側凸部を形成し、
前記ナット側対向部に、前記着脱部材側凸部が嵌合するナット側凹部を形成したことを特徴とするものである。
Next, of the present invention, the invention described in claim 7 is the invention described in claim 6, wherein the lubricant supply body attaching / detaching member is on the attaching / detaching member side facing the nut in the radial direction of the nut. With a nut facing part,
The nut includes a nut-side facing portion that faces the lubricant supply body attaching / detaching member in the radial direction of the nut,
A detachable member side convex portion that protrudes toward the nut side when viewed from the axial direction of the screw shaft is formed on the detachable member side nut facing portion,
A nut-side concave portion into which the detachable member-side convex portion is fitted is formed in the nut-side facing portion.

本発明によると、着脱部材側ナット対向部に形成した着脱部材側凸部を、ナット側対向部に形成したナット側凹部に嵌合させることにより、潤滑剤供給体着脱部材をナットの端部へ取り付けることが可能となる。
このため、潤滑剤供給体着脱部材をナットの端部へ取り付けた状態で、潤滑剤供給体着脱部材に、ナットの周方向や径方向への外力が加わった場合でも、潤滑剤供給体着脱部材がナットの端部から外れることを抑制することが可能となる。
According to the present invention, by attaching the detachable member side convex portion formed on the detachable member side nut facing portion to the nut side concave portion formed on the nut side facing portion, the lubricant supply body detachable member is moved to the end portion of the nut. It can be attached.
Therefore, even when an external force in the circumferential direction or radial direction of the nut is applied to the lubricant supply body attaching / detaching member with the lubricant supply body attaching / detaching member attached to the end of the nut, the lubricant supply body attaching / detaching member Can be prevented from coming off from the end of the nut.

次に、本発明のうち、請求項8に記載した発明は、請求項7に記載した発明であって、前記潤滑剤供給体着脱部材は、前記着脱部材側ナット対向部の少なくとも一部を弾性変形させて前記着脱部材側凸部を前記ナットの径方向に前記ねじ軸側へ変位可能な着脱部材側弾性変形部を備えることを特徴とするものである。
本発明によると、潤滑剤供給体着脱部材をナットの端部へ取り付ける際に、着脱部材側弾性変形部を弾性変形させることにより、着脱部材側凸部を、ナットの径方向にねじ軸側へ変位させることが可能となる。
このため、潤滑剤供給体着脱部材をナットの端部へ取り付ける際に、着脱部材側凸部を、ナット側凹部よりもねじ軸側へ変位させることが可能となり、着脱部材側凸部をナット側凹部へ嵌合させる作業が容易となる。
Next, among the present inventions, the invention described in claim 8 is the invention described in claim 7, wherein the lubricant supply body attaching / detaching member is elastic at least a part of the attaching / detaching member side nut facing portion. The attachment / detachment member side convex portion is provided with an attachment / detachment member side elastic deformation portion that can be deformed and displaced in the radial direction of the nut toward the screw shaft side.
According to the present invention, when attaching the lubricant supply body attaching / detaching member to the end portion of the nut, the attaching / detaching member side elastic deformation portion is elastically deformed so that the attaching / detaching member side convex portion is moved to the screw shaft side in the radial direction of the nut. It can be displaced.
For this reason, when attaching the lubricant supply body attaching / detaching member to the end portion of the nut, the attaching / detaching member side convex portion can be displaced to the screw shaft side from the nut side concave portion, and the attaching / detaching member side convex portion can be displaced to the nut side. The operation of fitting into the recess becomes easy.

次に、本発明のうち、請求項9に記載した発明は、請求項8に記載した発明であって、前記着脱部材側弾性変形部を、前記循環部品固定部材のうち前記ねじ軸の軸方向から見て前記ボール循環部品と重なる部分の一部を貫通する開口部とし、
前記潤滑剤供給体着脱部材の前記着脱部材側凸部と前記着脱部材側弾性変形部との間の部分のうち、前記ねじ軸の軸方向から見て前記ボール循環部品と重なる部分の前記ナットの径方向に沿った最大長さを、0.5mm以上としたことを特徴とするものである。
Next, of the present invention, the invention described in claim 9 is the invention described in claim 8, wherein the attaching / detaching member side elastically deforming portion is arranged in the axial direction of the screw shaft of the circulating component fixing member. An opening that penetrates a part of the portion that overlaps the ball circulation component as viewed from
Of the portion of the lubricant supply body attaching / detaching member between the attaching / detaching member side convex portion and the attaching / detaching member side elastic deformation portion, the nut of the portion that overlaps with the ball circulation component when viewed from the axial direction of the screw shaft The maximum length along the radial direction is 0.5 mm or more.

本発明によると、ボール循環部品を通過するボールによって衝撃が加わったボール循環部品が、潤滑剤供給体着脱部材をナットの端面から外れる方向へ押圧しても、ボール循環部品が潤滑剤供給体着脱部材へ加える押圧力を抑制することが可能となる。
このため、ボールねじの作動時において、潤滑剤供給体着脱部材の変形を抑制することが可能となり、潤滑剤供給体着脱部材のナットの端面からの脱落を抑制することが可能となる。
According to the present invention, even when the ball circulation component that has been impacted by the ball passing through the ball circulation component presses the lubricant supply member attachment / detachment member in the direction away from the end surface of the nut, the ball circulation component is attached / detached. The pressing force applied to the member can be suppressed.
For this reason, it is possible to suppress deformation of the lubricant supply body attaching / detaching member during operation of the ball screw, and it is possible to suppress dropping of the lubricant supply body attaching / detaching member from the end face of the nut.

次に、本発明のうち、請求項10に記載した発明は、請求項6から9のうちいずれか1項に記載した発明であって、前記潤滑剤供給体着脱部材に収容した前記潤滑剤供給体の逸脱を抑制する板状の逸脱抑制部材を備え、
前記逸脱抑制部材の形状を、前記ねじ軸の軸方向から見て前記逸脱抑制部材全体が前記潤滑剤供給体着脱部材と重なる形状としたことを特徴とするものである。
本発明によると、逸脱抑制部材を、潤滑剤供給体の逸脱を抑制するための部分を残して、ねじ軸の軸方向から見て潤滑剤供給体着脱部材よりも突出しない形状とすることが可能となる。
このため、ねじ軸の軸方向から見た逸脱抑制部材の最小幅を、ねじ軸の軸方向から見たナットの最小幅以下とすることが可能となる。
Next, of the present invention, the invention described in claim 10 is the invention described in any one of claims 6 to 9, wherein the lubricant supply housed in the lubricant supply body attaching / detaching member is provided. Provided with a plate-like deviation suppressing member that suppresses deviation of the body,
The shape of the deviation suppressing member is such that the entire deviation suppressing member overlaps the lubricant supply member attaching / detaching member when viewed from the axial direction of the screw shaft.
According to the present invention, the deviation suppressing member can be shaped so as not to protrude from the lubricant supply body attaching / detaching member when viewed from the axial direction of the screw shaft, leaving a portion for suppressing the deviation of the lubricant supply body. It becomes.
For this reason, it becomes possible to make the minimum width | variety of the deviation suppression member seen from the axial direction of the screw shaft below the minimum width of the nut seen from the axial direction of the screw shaft.

次に、本発明のうち、請求項11に記載した発明は、請求項10に記載した発明であって、前記逸脱抑制部材は、前記潤滑剤供給体着脱部材と前記ナットの径方向で対向する逸脱抑制部材側対向部を備え、
前記潤滑剤供給体着脱部材は、前記逸脱抑制部材と前記ナットの径方向で対向する着脱部材側対向部を備え、
前記逸脱抑制部材側対向部に、前記ねじ軸の軸方向から見て前記潤滑剤供給体着脱部材側へ突出する逸脱抑制部材側凸部を形成し、
前記着脱部材側対向部に、前記逸脱抑制部材側凸部が嵌合する着脱部材側凹部を形成したことを特徴とするものである。
Next, of the present invention, the invention described in claim 11 is the invention described in claim 10, wherein the deviation suppressing member faces the lubricant supply body attaching / detaching member in the radial direction of the nut. Provided with a deviation suppressing member side facing portion,
The lubricant supply body attaching / detaching member includes an attaching / detaching member side facing portion facing the deviation suppressing member in a radial direction of the nut,
A deviation suppressing member-side convex portion that protrudes toward the lubricant supply body attaching / detaching member side when viewed from the axial direction of the screw shaft is formed on the deviation suppressing member-side facing portion,
The detachable member-side concave portion into which the deviation suppressing member-side convex portion is fitted is formed in the detachable member-side facing portion.

本発明によると、逸脱抑制部材側対向部に形成した逸脱抑制部材側凸部を、着脱部材側対向部に形成した着脱部材側凹部に嵌合させることにより、逸脱抑制部材を潤滑剤供給体着脱部材へ取り付けることが可能となる。
このため、逸脱抑制部材を潤滑剤供給体着脱部材へ取り付けた状態で、逸脱抑制部材に、ナットの周方向や径方向への外力が加わった場合でも、逸脱抑制部材が潤滑剤供給体着脱部材から外れることを抑制することが可能となる。
According to the present invention, the deviation suppressing member-side convex portion formed on the deviation suppressing member-side facing portion is fitted into the detachable member-side concave portion formed on the detachable member-side facing portion, whereby the deviation suppressing member is attached / detached with the lubricant supply body. It can be attached to a member.
For this reason, even when an external force in the circumferential direction or radial direction of the nut is applied to the departure restraining member in a state where the departure restraining member is attached to the lubricant supply body attaching / detaching member, the departure restraining member is the lubricant supplier attaching / detaching member. It is possible to suppress detachment.

次に、本発明のうち、請求項12に記載した発明は、請求項11に記載した発明であって、前記逸脱抑制部材は、前記逸脱抑制部材側対向部の少なくとも一部を弾性変形させて前記逸脱抑制部材側凸部を前記ナットの径方向に沿って前記ねじ軸側へ変位可能な逸脱抑制部材側弾性変形部を備えることを特徴とするものである。
本発明によると、逸脱抑制部材を潤滑剤供給体着脱部材へ取り付ける際に、逸脱抑制部材側弾性変形部を弾性変形させることにより、逸脱抑制部材側凸部を、ナットの径方向にねじ軸側へ変位させることが可能となる。
このため、逸脱抑制部材を潤滑剤供給体着脱部材へ取り付ける際に、逸脱抑制部材側凸部を、着脱部材側凹部よりもねじ軸側へ変位させることが可能となり、逸脱抑制部材側凸部を着脱部材側凹部へ嵌合させる作業が容易となる。
Next, of the present invention, the invention described in claim 12 is the invention described in claim 11, wherein the deviation suppressing member elastically deforms at least a part of the deviation suppressing member side facing portion. The departure restraining member side convex portion is provided with a departure restraining member side elastic deformation portion capable of being displaced toward the screw shaft along the radial direction of the nut.
According to the present invention, when the deviation suppressing member is attached to the lubricant supply body attaching / detaching member, the deviation suppressing member-side elastic deformation portion is elastically deformed so that the deviation suppressing member-side convex portion is arranged on the screw shaft side in the radial direction of the nut. It is possible to displace it.
For this reason, when attaching the deviation suppressing member to the lubricant supply body attaching / detaching member, the deviation suppressing member side convex portion can be displaced to the screw shaft side from the attaching / detaching member side concave portion. The operation of fitting into the detachable member side recess is facilitated.

次に、本発明のうち、請求項13に記載した発明は、請求項10から12のうちいずれか1項に記載した発明であって、前記逸脱抑制部材を、樹脂材料を用いて形成し、
前記逸脱抑制部材の前記ねじ軸と対向する部分の少なくとも一部に、前記ねじ軸側軌道溝と接触する逸脱抑制部材側シール部を形成したことを特徴とするものである。
本発明によると、樹脂材料を用いて形成した逸脱抑制部材の、ねじ軸と対向する部分の少なくとも一部に、ねじ軸側軌道溝と接触する逸脱抑制部材側シール部を形成する。
このため、逸脱抑制部材とねじ軸側軌道溝との間に形成される隙間の少なくとも一部を、逸脱抑制部材側シール部で閉塞することが可能となり、潤滑剤供給体とねじ軸の外周面との間への異物の侵入を抑制することが可能となる。
Next, of the present invention, the invention described in claim 13 is the invention described in any one of claims 10 to 12, wherein the deviation suppressing member is formed using a resin material,
A deviation restraining member side seal portion that contacts the screw shaft side raceway groove is formed in at least a part of a portion of the deviation restraining member facing the screw shaft.
According to the present invention, the deviation suppressing member-side seal portion that contacts the screw shaft side raceway groove is formed on at least a part of the portion facing the screw shaft of the deviation suppressing member formed using the resin material.
For this reason, it is possible to close at least a part of the gap formed between the deviation suppressing member and the screw shaft side raceway groove with the deviation suppressing member side seal portion, and the outer peripheral surface of the lubricant supply body and the screw shaft. It is possible to suppress the entry of foreign matter between the two.

次に、本発明のうち、請求項14に記載した発明は、請求項1から13のうちいずれか1項に記載した複数のボールねじを備え、
前記複数のボールねじを、互いに前記ねじ軸の軸方向を平行とし、且つ前記ねじ軸の軸方向から見て前記ナットの最小幅の部分同士を対向させて配列したことを特徴とするボールねじ装置である。
Next, among the present inventions, the invention described in claim 14 includes the plurality of ball screws described in any one of claims 1 to 13,
The ball screw device, wherein the plurality of ball screws are arranged such that the axial directions of the screw shafts are parallel to each other, and the minimum width portions of the nuts are opposed to each other when viewed from the axial direction of the screw shafts It is.

本発明によると、ねじ軸の軸方向から見たナットの幅を減少させた複数のボールねじを、互いにねじ軸の軸方向を平行とし、且つねじ軸の軸方向から見てナットの最小幅の部分同士を対向させて配列して、ボールねじ装置を形成する。
このため、隣り合うボールねじ同士の間隔を減少させることが可能となり、ボールねじ装置を小型化することが可能となる。また、ナットの質量が減少したボールねじを備える構成とすることが可能となるため、ボールねじ装置の駆動に用いる動力源を小型化することが可能となる。
According to the present invention, a plurality of ball screws having a reduced nut width as viewed from the axial direction of the screw shaft are parallel to each other in the axial direction of the screw shaft and have the minimum width of the nut as viewed from the axial direction of the screw shaft. The parts are arranged facing each other to form a ball screw device.
For this reason, it becomes possible to reduce the space | interval of adjacent ball screws, and it becomes possible to miniaturize a ball screw apparatus. Moreover, since it becomes possible to set it as the structure provided with the ball screw in which the mass of the nut decreased, it becomes possible to reduce the size of the power source used for driving the ball screw device.

本発明によれば、ねじ軸の軸方向から見たナットの幅を減少させて、ナットを径方向に小型化することが可能となるため、ボールねじを備えるボールねじ装置を小型化することが可能となる。また、ナットを径方向に小型化することにより、ナットの質量を減少させることが可能となるため、ボールねじ装置の駆動に用いる動力源を小型化することが可能となる。   According to the present invention, it is possible to reduce the width of the nut viewed from the axial direction of the screw shaft and to reduce the size of the nut in the radial direction. Therefore, it is possible to reduce the size of the ball screw device including the ball screw. It becomes possible. Further, by reducing the size of the nut in the radial direction, the mass of the nut can be reduced, so that the power source used for driving the ball screw device can be reduced in size.

第一実施形態の一例であるボールねじを備えたボールねじ装置の構成を示す図である。It is a figure which shows the structure of the ball screw apparatus provided with the ball screw which is an example of 1st embodiment. 図1のII−II線断面図である。It is the II-II sectional view taken on the line of FIG. 図2のIII線矢視図である。FIG. 3 is a view taken along line III in FIG. 2. 図1のIV線矢視図である。FIG. 4 is a view taken in the direction of arrows IV in FIG. 1. 図4のV線矢視図である。FIG. 5 is a view taken in the direction of arrow V in FIG. 図5中に円VIで囲んだ範囲及びその周辺の拡大図である。FIG. 6 is an enlarged view of a range surrounded by a circle VI in FIG. 5 and its surroundings. 循環部品固定部材の構成を示す斜視図である。It is a perspective view which shows the structure of a circulation component fixing member. ナットの端部にボール循環部品を固定する際の作業手順を示す図である。It is a figure which shows the operation | movement procedure at the time of fixing a ball | bowl circulation component to the edge part of a nut. 従来構造のボールねじを備えたボールねじ装置の構成を示す図である。It is a figure which shows the structure of the ball screw apparatus provided with the ball screw of the conventional structure. 第二実施形態の一例であるボールねじの一部を破断して示す図である。It is a figure which fractures | ruptures and shows a part of ball screw which is an example of 2nd embodiment. 潤滑剤供給体着脱部材の構成を示す図である。It is a figure which shows the structure of a lubricant supply body attachment / detachment member. 図10のXII線矢視図である。It is an XII arrow directional view of FIG. 従来例のボールねじを示す図である。It is a figure which shows the ball screw of a prior art example. 図13のXIV線矢視図である。FIG. 14 is a view taken in the direction of arrows XIV in FIG. 13. 従来例のボールねじが備えるボール循環部品及び循環部品固定部材を、ねじ軸の軸方向から見た図である。It is the figure which looked at the ball circulation component with which the ball screw of a prior art example and a circulation component fixing member are seen from the axial direction of the screw shaft. 図15のXVI線矢視図である。FIG. 16 is a view taken in the direction of arrows XVI in FIG. 15.

(第一実施形態)
以下、本発明の第一実施形態(以下、「本実施形態」と記載する)について、図面を参照しつつ説明する。
(構成)
まず、図1を用いて、本実施形態のボールねじを備えたボールねじ装置の構成を説明する。
図1は、本実施形態の一例であるボールねじ1を備えたボールねじ装置2の構成を示す図であり、図1(a)は、ボールねじ装置2の側面図、図1(b)は、図1(a)のB線矢視図である。
(First embodiment)
Hereinafter, a first embodiment of the present invention (hereinafter referred to as “the present embodiment”) will be described with reference to the drawings.
(Constitution)
First, the configuration of a ball screw device including the ball screw according to the present embodiment will be described with reference to FIG.
FIG. 1 is a diagram illustrating a configuration of a ball screw device 2 including a ball screw 1 which is an example of the present embodiment. FIG. 1A is a side view of the ball screw device 2, and FIG. FIG. 2 is a view on arrow B of FIG.

図1中に示すように、本実施形態のボールねじ装置2は、例えば、チップマウンターが備える、鉛直方向軸(Z軸)へ移動する搬送装置等を形成する装置であり、複数のボールねじ1を備えている。
図1(a)中に示すように、複数のボールねじ1は、互いに、ねじ軸4の軸方向を平行として配列した状態で、機台6に取り付けられている。なお、図1(a)中では、ねじ軸4の中心軸線を、符号CLSを付して示している。
また、図1(b)中に示すように、複数のボールねじ1は、ねじ軸4の軸方向から見て、ナット8の最小幅Wminの部分同士を対向させて配列されている。
As shown in FIG. 1, the ball screw device 2 of the present embodiment is a device that forms, for example, a transport device that moves to a vertical axis (Z axis) provided in a chip mounter, and includes a plurality of ball screws 1. It has.
As shown in FIG. 1A, the plurality of ball screws 1 are attached to the machine base 6 in a state where the axial directions of the screw shafts 4 are arranged in parallel with each other. In FIG. 1A, the central axis of the screw shaft 4 is shown with a reference CLS.
As shown in FIG. 1B, the plurality of ball screws 1 are arranged with the portions of the nut 8 having the minimum width Wmin facing each other when viewed from the axial direction of the screw shaft 4.

次に、図2から図7を用いて、本実施形態のボールねじ1の構成を説明する。
図2は、図1のII−II線断面図であり、本実施形態の一例であるボールねじ1の一部を破断して示す図である。
図2中に示すように、本実施形態のボールねじ1は、ねじ軸4と、ナット8と、複数のボール10と、ボール循環部品12と、循環部品固定部材14を備えている。
ねじ軸4は、合金鋼等の鋼材で形成した棒状部材であり、螺旋状のねじ軸側軌道溝16を外周面に有している。ねじ軸4の端部は、モータ等の回転動力源(図示せず)に連結されている。
ナット8は、合金鋼等の鋼材で形成された円筒状部材であり、ねじ軸4の外周側に配置されている。
Next, the structure of the ball screw 1 of this embodiment is demonstrated using FIGS.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1 and is a view showing a part of a ball screw 1 which is an example of this embodiment.
As shown in FIG. 2, the ball screw 1 of this embodiment includes a screw shaft 4, a nut 8, a plurality of balls 10, a ball circulation component 12, and a circulation component fixing member 14.
The screw shaft 4 is a rod-shaped member formed of a steel material such as alloy steel, and has a helical screw shaft side raceway groove 16 on the outer peripheral surface. The end of the screw shaft 4 is connected to a rotational power source (not shown) such as a motor.
The nut 8 is a cylindrical member formed of a steel material such as alloy steel, and is disposed on the outer peripheral side of the screw shaft 4.

また、ナット8は、ねじ軸側軌道溝16と対向するナット側軌道溝18を内周面に有している。すなわち、ねじ軸側軌道溝16とナット側軌道溝18は、同じリードで形成されている。
また、ナット8には、ねじ軸4の軸方向に延在してナット8を貫通する、ボール戻り路20が形成されている。
さらに、ナット8の、循環部品固定部材14とナット8の径方向で対向する部分(以下、「ナット側対向部8a」と記載する)には、後述する固定部材側凸部22が嵌合するナット側凹部24を形成している。
各ボール10は、例えば、合金鋼等の鋼材で形成された球体であり、ねじ軸側軌道溝16とナット側軌道溝18との間に形成される負荷転動路26内に、転動自在に装填されている。
The nut 8 has a nut side raceway groove 18 facing the screw shaft side raceway groove 16 on the inner peripheral surface. That is, the screw shaft side raceway groove 16 and the nut side raceway groove 18 are formed by the same lead.
In addition, a ball return path 20 that extends in the axial direction of the screw shaft 4 and penetrates the nut 8 is formed in the nut 8.
Further, a fixing member-side convex portion 22 to be described later is fitted to a portion of the nut 8 that faces the circulating component fixing member 14 and the nut 8 in the radial direction (hereinafter referred to as “nut-side facing portion 8a”). A nut side recess 24 is formed.
Each ball 10 is a sphere formed of a steel material such as alloy steel, for example, and can freely roll in a load rolling path 26 formed between the screw shaft side raceway groove 16 and the nut side raceway groove 18. Is loaded.

すなわち、本実施形態のボールねじ1は、ねじ軸4(またはナット8)の回転運動に伴って、負荷転動路26内を複数のボール10が転動する。そして、ナット8(またはねじ軸4)がボール10の転動を介して、ねじ軸4の軸方向に沿って直線移動する構成となっている。
なお、負荷転動路26内には、ポリα−オレフィン油等のパラフィン系炭化水素油や、エーテル油、エステル油等を単独または複数混合して混ぜ合わせた液体等、流動性を有する潤滑剤(潤滑油)を配置している。
ボール循環部品12は、ナット8の端部に配置されており、その内部に、ボール誘導路28が形成されている。
That is, in the ball screw 1 of the present embodiment, a plurality of balls 10 roll in the load rolling path 26 with the rotational movement of the screw shaft 4 (or nut 8). Then, the nut 8 (or the screw shaft 4) is configured to linearly move along the axial direction of the screw shaft 4 through the rolling of the ball 10.
In addition, in the load rolling path 26, a lubricant having fluidity, such as a liquid obtained by mixing a paraffinic hydrocarbon oil such as poly α-olefin oil, an ether oil, an ester oil, or the like alone or in combination. (Lubricating oil) is arranged.
The ball circulation component 12 is disposed at the end of the nut 8, and a ball guiding path 28 is formed therein.

ボール誘導路28は、負荷転動路26とボール戻り路20とを連通する通路であり、一方の端部に移動したボール10を負荷転動路26内からすくい上げ、そのすくい上げたボール10を、他方の端部から、ボール戻り路20を介して負荷転動路26内へ戻す。これにより、複数のボール10は、ねじ軸4またはナット8の回転運動に伴って、ボール誘導路28及び負荷転動路26内を無限循環する。すなわち、負荷転動路26及びボール誘導路28によって、ボール10の無限循環通路が形成されている。
循環部品固定部材14は、エラストマー等の樹脂材料を用いて、板状に形成されており、ナット8の端部へボール循環部品12を間に挟んで取り付けて、ボール循環部品12をナット8の端部に固定する。
The ball guide path 28 is a path that connects the load rolling path 26 and the ball return path 20. The ball 10 that has moved to one end is scooped up from the load rolling path 26, and the scooped ball 10 is From the other end, it returns to the load rolling path 26 via the ball return path 20. Thereby, the plurality of balls 10 circulate infinitely in the ball guiding path 28 and the load rolling path 26 with the rotational movement of the screw shaft 4 or the nut 8. That is, the infinite circulation path of the ball 10 is formed by the load rolling path 26 and the ball guide path 28.
The circulating component fixing member 14 is formed in a plate shape using a resin material such as an elastomer, and is attached to the end of the nut 8 with the ball circulating component 12 sandwiched therebetween, and the ball circulating component 12 is attached to the nut 8. Secure to the end.

また、循環部品固定部材14の、ナット8とナット8の径方向で対向する部分(以下、「固定部材側対向部14a」と記載する)には、ねじ軸4の軸方向から見てナット8側へ突出する固定部材側凸部22を形成している。
具体的には、循環部品固定部材14には、二箇所の固定部材側凸部22が形成されており、これら二箇所の固定部材側凸部22は、ねじ軸4の中心軸線を挟んで互いに正対する位置に配置されている。したがって、ナット8には、二箇所のナット側凹部24が形成されており、これら二箇所のナット側凹部24は、二箇所の固定部材側凸部22と同様、ねじ軸4の中心軸線を挟んで互いに正対する位置に配置されている。
Further, a portion of the circulating component fixing member 14 facing the nut 8 in the radial direction of the nut 8 (hereinafter referred to as “fixing member side facing portion 14 a”) is a nut 8 as viewed from the axial direction of the screw shaft 4. The fixing member side convex part 22 which protrudes to the side is formed.
Specifically, two fixed member-side convex portions 22 are formed on the circulating component fixing member 14, and these two fixed member-side convex portions 22 are located on both sides of the central axis of the screw shaft 4. It is arranged at the position facing directly. Accordingly, the nut 8 is formed with two nut-side recesses 24, and the two nut-side recesses 24 sandwich the central axis of the screw shaft 4 as with the two fixing member-side protrusions 22. Are arranged at positions facing each other.

図3は、図2のIII線矢視図である。なお、図3中では、説明のために、循環部品固定部材14の図示を省略している。
図3中に示すように、ナット8の端部に配置したボール循環部品12は、ねじ軸4の軸方向から見て、ナット8の端部の一部のみと重なる。
図4は、図1のIV線矢視図である。また、図5は、図4のV線矢視図である。
図4及び図5中に示すように、循環部品固定部材14は、固定部材側循環部品押え部14bと、固定部材側循環部品固定部14cを備えている。
固定部材側循環部品押え部14bは、ねじ軸4の軸方向から見て、ボール循環部品12の少なくとも一部と重なる。
固定部材側循環部品固定部14cは、固定部材側循環部品押え部14bから突出するとともに、ナット8の端部の一部と重なる。
FIG. 3 is a view taken along the line III in FIG. In addition, in FIG. 3, illustration of the circulation component fixing member 14 is abbreviate | omitted for description.
As shown in FIG. 3, the ball circulation component 12 disposed at the end of the nut 8 overlaps only a part of the end of the nut 8 when viewed from the axial direction of the screw shaft 4.
FIG. 4 is a view taken along line IV in FIG. FIG. 5 is a view taken in the direction of arrow V in FIG.
As shown in FIGS. 4 and 5, the circulating component fixing member 14 includes a fixing member side circulating component pressing portion 14 b and a fixing member side circulating component fixing portion 14 c.
The fixed member-side circulating component pressing portion 14 b overlaps at least a part of the ball circulating component 12 when viewed from the axial direction of the screw shaft 4.
The fixed member-side circulating component fixing portion 14 c protrudes from the fixing member-side circulating component holding portion 14 b and overlaps a part of the end portion of the nut 8.

ここで、循環部品固定部材14のうち、循環部品固定部材14に要求される機能を発揮するために必要な部分は、ボール循環部品12をナット8の端部に固定するための部分、具体的には、ボール循環部品12を間に挟んでナット8の端部と対向する部分と、固定部材側凸部22を形成した部分である。このため、循環部品固定部材14のうち、ボール循環部品12をナット8の端部に固定するための部分以外の一部を、ナット8の端部と重ならない形状としても、循環部品固定部材14に要求される機能を発揮することが可能である。したがって、本実施形態では、循環部品固定部材14を、ねじ軸4の軸方向から見てボール循環部品12と重なる部分以外の一部が、ボール循環部品12と重なる部分よりもねじ軸4の中心からの距離が短い形状に形成している。   Here, in the circulating component fixing member 14, a portion necessary for performing the function required for the circulating component fixing member 14 is a portion for fixing the ball circulating component 12 to the end of the nut 8, specifically These are a portion facing the end portion of the nut 8 with the ball circulation component 12 in between and a portion where the fixing member side convex portion 22 is formed. For this reason, even if a part of the circulating component fixing member 14 other than the portion for fixing the ball circulating component 12 to the end of the nut 8 is formed so as not to overlap the end of the nut 8, the circulating component fixing member 14 It is possible to perform the functions required for the. Therefore, in this embodiment, the circulating component fixing member 14 is centered on the screw shaft 4 more than the portion overlapping the ball circulating component 12 except for the portion overlapping the ball circulating component 12 when viewed from the axial direction of the screw shaft 4. The distance from is formed in a short shape.

また、図4及び図5中に示すように、ナット8は、ねじ軸4の軸方向から見て、循環部品固定部材14及びナット側軌道溝18と重なる部分以外の一部が、循環部品固定部材14と重なる部分よりも、ねじ軸4の中心からの距離が短い形状に形成されている。
また、図5中に示すように、循環部品固定部材14は、ねじ軸4を挿通させる固定部材側ねじ軸挿通孔30と、固定部材側弾性変形部32を備えている。
As shown in FIGS. 4 and 5, the nut 8 has a portion other than the portion overlapping the circulating component fixing member 14 and the nut-side track groove 18 as viewed from the axial direction of the screw shaft 4. The distance from the center of the screw shaft 4 is shorter than the portion overlapping the member 14.
Further, as shown in FIG. 5, the circulating component fixing member 14 includes a fixing member side screw shaft insertion hole 30 through which the screw shaft 4 is inserted, and a fixing member side elastic deformation portion 32.

固定部材側弾性変形部32は、循環部品固定部材14のうち、ねじ軸4の軸方向から見てボール循環部品12と重なる部分の一部を貫通する開口部である。具体的には、固定部材側ねじ軸挿通孔30と固定部材側凸部22との間において、ナット8の周方向に延在させて形成した長孔である。そして、固定部材側対向部14aのうち、固定部材側凸部22を形成した部分をねじ軸4側へ押圧すると、その開口面積がナット8の径方向に減少することにより、固定部材側対向部14aのうち、固定部材側凸部22を形成した部分を弾性変形させることが可能となる。   The fixing member-side elastic deformation portion 32 is an opening that penetrates a part of the circulating component fixing member 14 that overlaps the ball circulating component 12 when viewed from the axial direction of the screw shaft 4. Specifically, it is a long hole formed to extend in the circumferential direction of the nut 8 between the fixing member side screw shaft insertion hole 30 and the fixing member side convex portion 22. And when the part which formed the fixing member side convex part 22 among the fixing member side opposing parts 14a is pressed to the screw shaft 4 side, the opening area will reduce in the radial direction of the nut 8, and fixed member side opposing part It becomes possible to elastically deform the part in which the fixing member side convex part 22 was formed among 14a.

これにより、固定部材側弾性変形部32は、固定部材側対向部14aの一部を弾性変形させて、固定部材側凸部22を、ナット8の径方向にねじ軸4側へ変位可能に形成されている。
図6は、図5中に円VIで囲んだ範囲及びその周辺の拡大図である。
図6中に示すように、本実施形態のボールねじ1では、循環部品固定部材14の、固定部材側凸部22と固定部材側弾性変形部32との間の部分のうち、ねじ軸4の軸方向から見てボール循環部品12と重なる部分の、ナット8の径方向に沿った最大長さLmaxを、0.5mm以上としている。
Thereby, the fixing member side elastic deformation part 32 elastically deforms a part of the fixing member side facing part 14a, and the fixing member side convex part 22 is formed to be displaceable to the screw shaft 4 side in the radial direction of the nut 8. Has been.
FIG. 6 is an enlarged view of the area surrounded by a circle VI in FIG. 5 and its surroundings.
As shown in FIG. 6, in the ball screw 1 of the present embodiment, of the part between the fixed member side convex portion 22 and the fixed member side elastic deformable portion 32 of the circulating component fixing member 14, the screw shaft 4. The maximum length Lmax along the radial direction of the nut 8 at the portion overlapping with the ball circulation component 12 when viewed from the axial direction is 0.5 mm or more.

図7は、循環部品固定部材14の構成を示す斜視図である。
図7中に示すように、循環部品固定部材14のねじ軸4と対向する部分には、ねじ軸側軌道溝16と接触する循環部品固定部材側シール部34を形成している。
循環部品固定部材側シール部34は、ねじ軸側軌道溝16へ向かうほど断面積が薄くなるように形成されており、ナット8の周方向に沿って、ねじ軸側軌道溝16の形状に対応する螺旋状をなしている。
FIG. 7 is a perspective view showing the configuration of the circulating component fixing member 14.
As shown in FIG. 7, a circulating component fixing member side seal portion 34 that contacts the screw shaft side raceway groove 16 is formed in a portion of the circulating component fixing member 14 that faces the screw shaft 4.
The circulating part fixing member side seal portion 34 is formed so that the cross-sectional area becomes thinner toward the screw shaft side raceway groove 16, and corresponds to the shape of the screw shaft side raceway groove 16 along the circumferential direction of the nut 8. It has a spiral shape.

(作用)
次に、図1から図7を参照しつつ、図8及び図9を用いて、本実施形態のボールねじ1と、ボールねじ1を備えたボールねじ装置2の作用について説明する。
まず、図8を用いて、ナット8の端部にボール循環部品12を固定する作業について説明する。
図8は、ナット8の端部にボール循環部品12を固定する際の作業手順を示す図である。
(Function)
Next, the operation of the ball screw 1 of this embodiment and the ball screw device 2 including the ball screw 1 will be described with reference to FIGS. 1 to 7 and FIGS. 8 and 9.
First, the operation of fixing the ball circulation component 12 to the end of the nut 8 will be described with reference to FIG.
FIG. 8 is a view showing an operation procedure when the ball circulation component 12 is fixed to the end portion of the nut 8.

図8中に示すように、ナット8の端部にボール循環部品12を固定する際には、ナット8の端部に形成された循環部品嵌合部36内に、ボール循環部品12を挿入する。なお、循環部品嵌合部36は、ナット8の端部に開口した凹部であり、ナット側軌道溝18及びボール戻り路20と連通している。循環部品嵌合部36内にボール循環部品12を挿入すると、ボール循環部品12は、ねじ軸4の軸方向から見て、ナット8の端部の一部のみと重なる状態となる(図3参照)。   As shown in FIG. 8, when the ball circulation component 12 is fixed to the end of the nut 8, the ball circulation component 12 is inserted into the circulation component fitting portion 36 formed at the end of the nut 8. . The circulating component fitting portion 36 is a recess opened at the end of the nut 8 and communicates with the nut-side track groove 18 and the ball return path 20. When the ball circulation component 12 is inserted into the circulation component fitting portion 36, the ball circulation component 12 overlaps only a part of the end of the nut 8 when viewed from the axial direction of the screw shaft 4 (see FIG. 3). ).

なお、本実施形態では、循環部品嵌合部36内にボール循環部品12を挿入する際に、接着剤等の固着手段を用いない。しかしながら、これに限定するものではなく、循環部品嵌合部36内にボール循環部品12を挿入する際に、接着剤等の固着手段を用いてもよい。
循環部品嵌合部36内にボール循環部品12を挿入した後、固定部材側凸部22をナット側凹部24に嵌合させて、循環部品固定部材14を、ボール循環部品12を間に挟んでナット8の端部に取り付ける。これにより、ボール循環部品12を、ナット8の端部に固定する。
In the present embodiment, when the ball circulating component 12 is inserted into the circulating component fitting portion 36, no fixing means such as an adhesive is used. However, the present invention is not limited to this, and a fixing means such as an adhesive may be used when the ball circulating component 12 is inserted into the circulating component fitting portion 36.
After the ball circulating component 12 is inserted into the circulating component fitting portion 36, the fixing member side convex portion 22 is fitted into the nut side concave portion 24, and the circulating component fixing member 14 is sandwiched between the ball circulating component 12 therebetween. Attach to the end of the nut 8. Thereby, the ball circulation component 12 is fixed to the end portion of the nut 8.

ここで、固定部材側凸部22をナット側凹部24に嵌合させる際には、循環部品固定部材14のうち、ねじ軸4の中心からの距離が短い部分と、ナット8のうち、ねじ軸4の中心からの距離が短い部分とを、ねじ軸4の軸方向から見て、同じ方向へ向けて配置する。すなわち、循環部品固定部材14のうち、ねじ軸4の軸方向から見た最小幅の部分と、ナット8のうち、ねじ軸4の軸方向から見た最小幅の部分とを、ねじ軸4の軸方向から見て、同じ方向へ向けて配置する。   Here, when fitting the fixing member side convex portion 22 into the nut side concave portion 24, the portion of the circulating component fixing member 14 that is short from the center of the screw shaft 4 and the screw shaft of the nut 8. A portion having a short distance from the center of 4 is arranged in the same direction as viewed from the axial direction of the screw shaft 4. That is, the minimum width portion of the circulating component fixing member 14 viewed from the axial direction of the screw shaft 4 and the minimum width portion of the nut 8 viewed from the axial direction of the screw shaft 4 are Seen from the axial direction, it is arranged in the same direction.

また、固定部材側凸部22をナット側凹部24に嵌合させる際には、固定部材側対向部14aのうち、固定部材側凸部22を形成した部分をねじ軸4側(図8中では、ナット8の中心軸線側)へ押圧して、固定部材側弾性変形部32の開口面積を、ナット8の径方向に減少させる。これにより、固定部材側対向部14aのうち、固定部材側凸部22を形成した部分を弾性変形させ、固定部材側凸部22をねじ軸4側へ変位させる。そして、固定部材側凸部22をねじ軸4側へ変位させた循環部品固定部材14を、ナット8の端部に配置し、固定部材側凸部22とナット側凹部24とをナット8の径方向で対向させた後、循環部品固定部材14のうち弾性変形させた部分の形状を復元させて、固定部材側凸部22をナット側凹部24に嵌合させる。   Further, when fitting the fixing member side convex portion 22 into the nut side concave portion 24, the portion of the fixing member side facing portion 14a where the fixing member side convex portion 22 is formed is the screw shaft 4 side (in FIG. 8). , The opening area of the fixing member side elastic deformation portion 32 is reduced in the radial direction of the nut 8. Thereby, the part which formed the fixing member side convex part 22 among the fixing member side opposing parts 14a is elastically deformed, and the fixing member side convex part 22 is displaced to the screw shaft 4 side. Then, the circulating component fixing member 14 in which the fixing member side convex portion 22 is displaced to the screw shaft 4 side is disposed at the end portion of the nut 8, and the fixing member side convex portion 22 and the nut side concave portion 24 are arranged in the diameter of the nut 8. After facing in the direction, the shape of the elastically deformed portion of the circulating component fixing member 14 is restored, and the fixing member side convex portion 22 is fitted into the nut side concave portion 24.

以上により、本実施形態のボールねじ1では、循環部品固定部材14及びナット8の、ねじ軸4の軸方向から見た最小幅の部分を、ねじ軸4の軸方向から見て、同じ方向へ向けて配置する。このため、ナット8の、ねじ軸4の軸方向から見た最小幅の部分を、ナット8全体の最小幅とすることが可能となる。
また、本実施形態のボールねじ1では、固定部材側凸部22をナット側凹部24に嵌合させて、循環部品固定部材14を、ボール循環部品12を間に挟んでナット8の端部に取り付けることにより、ボール循環部品12を、ナット8の端部に固定する。このため、循環部品固定部材14のナット8の端部への取り付けが容易となるとともに、循環部品固定部材14がナット8の端部から外れることを抑制することが可能となる。
As described above, in the ball screw 1 of the present embodiment, the minimum width portion of the circulating component fixing member 14 and the nut 8 viewed from the axial direction of the screw shaft 4 is viewed in the same direction when viewed from the axial direction of the screw shaft 4. Place it facing. For this reason, the minimum width portion of the nut 8 viewed from the axial direction of the screw shaft 4 can be set to the minimum width of the nut 8 as a whole.
Further, in the ball screw 1 of the present embodiment, the fixing member side convex portion 22 is fitted into the nut side concave portion 24 so that the circulating component fixing member 14 is sandwiched between the ball circulating component 12 and the end of the nut 8. By attaching, the ball circulation part 12 is fixed to the end of the nut 8. For this reason, it is possible to easily attach the circulating component fixing member 14 to the end portion of the nut 8 and to prevent the circulating component fixing member 14 from being detached from the end portion of the nut 8.

次に、図9を用いて、本実施形態のボールねじ1を備えたボールねじ装置2について説明する。
本実施形態のボールねじ1を備えたボールねじ装置2は、互いにねじ軸4の軸方向を平行として配列した複数のボールねじ1を、ねじ軸4の軸方向から見て、ナット8の最小幅Wminの部分同士を対向させて配列して形成している(図1参照)。
このため、図9中に示す、従来構造のボールねじ1を備えたボールねじ装置2と比較して、隣り合うボールねじ1同士の間隔を、ナット8の最小幅Wminに応じて減少させることが可能となる。ここで、従来構造のボールねじ1とは、図9中に示すように、ナット8のねじ軸4の軸方向から見た形状が円環状であるボールねじ1である。なお、図9は、従来構造のボールねじ1を備えたボールねじ装置2の構成を示す図であり、図9(a)は、ボールねじ装置2の側面図、図9(b)は、図9(a)のB線矢視図である。
Next, the ball screw device 2 including the ball screw 1 of the present embodiment will be described with reference to FIG.
The ball screw device 2 including the ball screw 1 according to the present embodiment has a minimum width of the nut 8 when a plurality of ball screws 1 arranged with the axial direction of the screw shaft 4 parallel to each other are viewed from the axial direction of the screw shaft 4. Wmin portions are arranged to face each other (see FIG. 1).
For this reason, compared with the ball screw device 2 including the ball screw 1 having the conventional structure shown in FIG. 9, the interval between the adjacent ball screws 1 can be reduced according to the minimum width Wmin of the nut 8. It becomes possible. Here, the ball screw 1 having a conventional structure is a ball screw 1 having an annular shape when viewed from the axial direction of the screw shaft 4 of the nut 8 as shown in FIG. FIG. 9 is a diagram showing a configuration of a ball screw device 2 including a ball screw 1 having a conventional structure. FIG. 9A is a side view of the ball screw device 2, and FIG. It is a B line arrow directional view of 9 (a).

また、本実施形態のボールねじ1は、従来構造のボールねじ1と比較して、ナット8の質量を減少させても、負荷転動路26の形状及び負荷転動路26内に装填可能なボール10の数は変化していない。このため、本実施形態のボールねじ1の負荷容量は、従来構造のボールねじ1の負荷容量と同じである。
以上により、本実施形態のボールねじ1を備えたボールねじ装置2では、ねじ軸4の軸方向から見たナット8の幅を減少させた複数のボールねじ1により、ボールねじ装置2を形成する。このため、隣り合うボールねじ1同士の間隔を減少させることが可能となり、ボールねじ装置2を小型化することが可能となる。また、ナット8の質量が減少したボールねじ1を備える構成とすることが可能となるため、ボールねじ装置2の駆動に用いる動力源を小型化することが可能となる。
Further, the ball screw 1 of the present embodiment can be loaded into the shape of the load rolling path 26 and the load rolling path 26 even when the mass of the nut 8 is reduced as compared with the ball screw 1 having the conventional structure. The number of balls 10 has not changed. For this reason, the load capacity of the ball screw 1 of this embodiment is the same as the load capacity of the ball screw 1 of the conventional structure.
As described above, in the ball screw device 2 including the ball screw 1 of the present embodiment, the ball screw device 2 is formed by the plurality of ball screws 1 in which the width of the nut 8 as viewed from the axial direction of the screw shaft 4 is reduced. . For this reason, it becomes possible to reduce the space | interval of adjacent ball screws 1, and it becomes possible to miniaturize the ball screw apparatus 2. FIG. Moreover, since it becomes possible to set it as the structure provided with the ball screw 1 in which the mass of the nut 8 decreased, the power source used for the drive of the ball screw apparatus 2 can be reduced in size.

(第一実施形態の効果)
以下、本実施形態のボールねじ1の効果を列挙する。
(1)本実施形態のボールねじ1では、循環部品固定部材14が、ねじ軸4の軸方向から見て、ボール循環部品12の一部と重なる固定部材側循環部品押え部14bと、固定部材側循環部品押え部14bから突出するとともに、ナット8の端部の一部と重なる固定部材側循環部品固定部14cを備えている。これに加え、ナット8を、ねじ軸4の軸方向から見て、循環部品固定部材14及びナット側軌道溝18と重なる部分以外の一部が、循環部品固定部材14と重なる部分よりも、ねじ軸4の中心からの距離が短い形状とする。
(Effects of the first embodiment)
Hereinafter, effects of the ball screw 1 of the present embodiment will be listed.
(1) In the ball screw 1 of the present embodiment, the circulating component fixing member 14 includes a fixing member-side circulating component pressing portion 14b that overlaps a part of the ball circulating component 12 when viewed from the axial direction of the screw shaft 4, and a fixing member. A fixing member-side circulation component fixing portion 14 c that protrudes from the side circulation component pressing portion 14 b and overlaps a part of the end of the nut 8 is provided. In addition to this, when the nut 8 is viewed from the axial direction of the screw shaft 4, a portion other than the portion overlapping the circulating component fixing member 14 and the nut side raceway groove 18 is screwed more than the portion overlapping the circulating component fixing member 14. The shape has a short distance from the center of the shaft 4.

このため、循環部品固定部材14を、ボール循環部品12をナット8の端部に固定するための部分を残して、ナット8の径方向に縮小させることが可能となる。これにより、ナット8の形状を、循環部品固定部材14を取り付けるための部分と、ボール10を転動させるための部分を残して、ナット8の径方向に縮小させた形状とすることが可能となるため、ねじ軸4の軸方向から見たナット8の幅を減少させることが可能となる。
その結果、ねじ軸4の軸方向から見たナット8の幅を減少させて、ナット8を径方向に小型化することが可能となるため、ボールねじ1を備えるボールねじ装置を小型化することが可能となる。
また、ナット8を径方向に小型化することにより、ナット8の質量を減少させることが可能となるため、ボールねじ装置の駆動に用いる動力源を小型化することが可能となる。
For this reason, the circulating component fixing member 14 can be reduced in the radial direction of the nut 8 while leaving a portion for fixing the ball circulating component 12 to the end of the nut 8. As a result, the shape of the nut 8 can be reduced in the radial direction of the nut 8 while leaving a portion for attaching the circulating component fixing member 14 and a portion for rolling the ball 10. Therefore, the width of the nut 8 viewed from the axial direction of the screw shaft 4 can be reduced.
As a result, the width of the nut 8 as viewed from the axial direction of the screw shaft 4 can be reduced and the nut 8 can be downsized in the radial direction, so that the ball screw device including the ball screw 1 can be downsized. Is possible.
In addition, by reducing the size of the nut 8 in the radial direction, the mass of the nut 8 can be reduced, so that the power source used for driving the ball screw device can be reduced.

(2)本実施形態のボールねじ1では、固定部材側対向部14aに形成した固定部材側凸部22を、ナット側対向部8aに形成したナット側凹部24に嵌合させることにより、循環部品固定部材14をナット8の端部へ取り付けることが可能となる。
このため、循環部品固定部材14をナット8の端部へ取り付けた状態で、循環部品固定部材14に、ナット8の周方向や径方向への外力が加わった場合でも、循環部品固定部材14がナット8の端部から外れることを抑制することが可能となる。
その結果、ボールねじ1の作動時において、ナット8の端部に固定したボール循環部品12の変位を抑制することが可能となり、ボールねじ1の作動に関する安定性を向上させることが可能となる。
(2) In the ball screw 1 according to the present embodiment, the fixed member side convex portion 22 formed on the fixed member side facing portion 14a is fitted into the nut side concave portion 24 formed on the nut side facing portion 8a, thereby circulating components. The fixing member 14 can be attached to the end of the nut 8.
Therefore, even when an external force in the circumferential direction or radial direction of the nut 8 is applied to the circulating component fixing member 14 with the circulating component fixing member 14 attached to the end of the nut 8, the circulating component fixing member 14 is It is possible to prevent the nut 8 from coming off from the end.
As a result, during the operation of the ball screw 1, it is possible to suppress the displacement of the ball circulation component 12 fixed to the end of the nut 8, and it is possible to improve the stability regarding the operation of the ball screw 1.

(3)本実施形態のボールねじ1では、循環部品固定部材14をナット8の端部へ取り付ける際に、固定部材側弾性変形部32を弾性変形させることにより、固定部材側凸部22を、ナット8の径方向にねじ軸4側へ変位させることが可能となる。
このため、循環部品固定部材14をナット8の端部へ取り付ける際に、固定部材側凸部22を、ナット側凹部24よりもねじ軸4側へ変位させることが可能となるため、固定部材側凸部22をナット側凹部24へ嵌合させる作業が容易となる。
その結果、ナット8の組み立て作業が容易となり、ボールねじ1の組み立て作業に関する作業効率を向上させることが可能となる。
(3) In the ball screw 1 of the present embodiment, when the circulating component fixing member 14 is attached to the end of the nut 8, the fixing member side convex portion 22 is formed by elastically deforming the fixing member side elastic deformation portion 32. The nut 8 can be displaced in the radial direction toward the screw shaft 4.
For this reason, when attaching the circulating component fixing member 14 to the end portion of the nut 8, the fixing member side convex portion 22 can be displaced to the screw shaft 4 side rather than the nut side concave portion 24. The operation | work which fits the convex part 22 to the nut side recessed part 24 becomes easy.
As a result, the assembling work of the nut 8 becomes easy, and the working efficiency related to the assembling work of the ball screw 1 can be improved.

(4)本実施形態のボールねじ1では、循環部品固定部材14の、固定部材側凸部22と固定部材側弾性変形部32との間の部分のうち、ねじ軸4の軸方向から見てボール循環部品12と重なる部分のナット8の径方向に沿った最大長さLmaxを、0.5mm以上としている。
このため、ボール循環部品12を通過するボール10によって衝撃が加わったボール循環部品12が、循環部品固定部材14をナット8の端面から外れる方向へ押圧しても、ボール循環部品12が循環部品固定部材14へ加える押圧力を抑制することが可能となる。
その結果、ボールねじ1の作動時において、循環部品固定部材14の変形を抑制することが可能となり、循環部品固定部材14のナット8の端面からの脱落を抑制することが可能となるため、ボールねじ1の作動に関する安定性を向上させることが可能となる。
(4) In the ball screw 1 of the present embodiment, the portion of the circulating component fixing member 14 between the fixing member side convex portion 22 and the fixing member side elastic deformation portion 32 is viewed from the axial direction of the screw shaft 4. The maximum length Lmax along the radial direction of the nut 8 that overlaps the ball circulation component 12 is 0.5 mm or more.
For this reason, even if the ball circulating component 12 to which an impact is applied by the ball 10 passing through the ball circulating component 12 presses the circulating component fixing member 14 in the direction away from the end face of the nut 8, the ball circulating component 12 is fixed to the circulating component. It becomes possible to suppress the pressing force applied to the member 14.
As a result, the deformation of the circulating component fixing member 14 can be suppressed during the operation of the ball screw 1 and the falling of the circulating component fixing member 14 from the end face of the nut 8 can be suppressed. It is possible to improve the stability regarding the operation of the screw 1.

(5)本実施形態のボールねじ1では、樹脂材料を用いて形成した循環部品固定部材14の、ねじ軸4と対向する部分に、ねじ軸側軌道溝16と接触する循環部品固定部材側シール部34を形成する。
このため、循環部品固定部材14とねじ軸側軌道溝16との間に形成される隙間を、循環部品固定部材側シール部34で閉塞することが可能となり、負荷転動路26内への異物の侵入を抑制することが可能となる。
その結果、負荷転動路26とボール10との間への異物の侵入を抑制することが可能となるため、ボールねじ1の作動性及び耐久性を向上させることが可能となる。
(5) In the ball screw 1 of the present embodiment, the circulating component fixing member side seal that contacts the screw shaft side raceway groove 16 in the portion facing the screw shaft 4 of the circulating component fixing member 14 formed using a resin material. A portion 34 is formed.
For this reason, it becomes possible to block the gap formed between the circulating component fixing member 14 and the screw shaft side raceway groove 16 with the circulating component fixing member side seal portion 34, and foreign matter into the load rolling path 26. It becomes possible to suppress the intrusion of.
As a result, it is possible to suppress the intrusion of foreign matter between the load rolling path 26 and the ball 10, so that the operability and durability of the ball screw 1 can be improved.

(6)本実施形態のボールねじ1を備えたボールねじ装置2では、ねじ軸4の軸方向から見たナット8の幅を減少させた複数のボールねじ1を、互いにねじ軸4の軸方向を平行とし、且つねじ軸4の軸方向から見てナット8の最小幅の部分同士を対向させて配列して、ボールねじ装置2を形成する。
このため、隣り合うボールねじ1同士の間隔を減少させることが可能となり、ボールねじ装置2を小型化することが可能となる。また、ナット8の質量が減少したボールねじ1を備える構成とすることが可能となるため、ボールねじ装置2の駆動に用いる動力源を小型化することが可能となる。
その結果、ボールねじ1の負荷容量を低下させることなく、ボールねじ装置2を設置するスペースの制限が緩和されるとともに、ボールねじ装置2の駆動に用いる電力等のエネルギーを減少させることが可能となる。
(6) In the ball screw device 2 provided with the ball screw 1 of the present embodiment, a plurality of ball screws 1 with reduced widths of the nuts 8 as viewed from the axial direction of the screw shaft 4 are connected to each other in the axial direction of the screw shaft 4. Are arranged in parallel with each other and the portions of the minimum width of the nut 8 as viewed from the axial direction of the screw shaft 4 are opposed to each other to form the ball screw device 2.
For this reason, it becomes possible to reduce the space | interval of adjacent ball screws 1, and it becomes possible to miniaturize the ball screw apparatus 2. FIG. Moreover, since it becomes possible to set it as the structure provided with the ball screw 1 in which the mass of the nut 8 decreased, the power source used for the drive of the ball screw apparatus 2 can be reduced in size.
As a result, without limiting the load capacity of the ball screw 1, the restriction on the space for installing the ball screw device 2 is relaxed, and the energy such as electric power used for driving the ball screw device 2 can be reduced. Become.

(応用例)
以下、本実施形態のボールねじ1の応用例を列挙する。
(1)本実施形態のボールねじ1では、固定部材側対向部14aに固定部材側凸部22を形成するとともに、ナット側対向部8aにナット側凹部24を形成し、固定部材側凸部22をナット側凹部24に嵌合させることにより、循環部品固定部材14をナット8の端部へ取り付けたが、これに限定するものではない。すなわち、例えば、循環部品固定部材14をナット8の端部に配置した状態で、循環部品固定部材14及びナット8をナット8の径方向へ貫通するボルト等を用いて、循環部品固定部材14をナット8の端部へ取り付けてもよい。
(Application examples)
Hereinafter, application examples of the ball screw 1 of the present embodiment will be listed.
(1) In the ball screw 1 of the present embodiment, the fixing member side convex portion 22 is formed in the fixing member side facing portion 14a, and the nut side concave portion 24 is formed in the nut side facing portion 8a. The circulating component fixing member 14 is attached to the end of the nut 8 by fitting the nut into the nut-side recess 24, but the present invention is not limited to this. That is, for example, in a state where the circulating component fixing member 14 is arranged at the end of the nut 8, the circulating component fixing member 14 is used by using a bolt or the like that penetrates the circulating component fixing member 14 and the nut 8 in the radial direction of the nut 8. You may attach to the edge part of the nut 8. FIG.

(2)本実施形態のボールねじ1では、循環部品固定部材14の構成を、固定部材側弾性変形部32を備える構成としたが、これに限定するものではなく、循環部品固定部材14の構成を、固定部材側弾性変形部32を備えていない構成としてもよい。この場合、循環部品固定部材14をナット8の端部へ取り付ける際には、例えば、循環部品固定部材14全体を湾曲させて、固定部材側凸部22をナット側凹部24に嵌合させる。
(3)本実施形態のボールねじ1では、固定部材側弾性変形部32を、循環部品固定部材14のうち、ねじ軸4の軸方向から見てボール循環部品12と重なる部分の一部を貫通する開口部としたが、これに限定するものではない。すなわち、固定部材側弾性変形部32を、例えば、ねじ軸4の軸方向から見てボール循環部品12と重なる部分の一部を、他の部分よりも薄肉に加工して形成してもよい。
(2) In the ball screw 1 of the present embodiment, the configuration of the circulating component fixing member 14 is configured to include the fixing member-side elastic deformation portion 32, but is not limited thereto, and the configuration of the circulating component fixing member 14 is not limited thereto. It is good also as a structure which is not equipped with the fixing member side elastic deformation part 32. FIG. In this case, when attaching the circulating component fixing member 14 to the end portion of the nut 8, for example, the entire circulating component fixing member 14 is curved and the fixing member side convex portion 22 is fitted into the nut side concave portion 24.
(3) In the ball screw 1 of the present embodiment, the fixing member side elastic deformation portion 32 penetrates a part of the circulating component fixing member 14 that overlaps the ball circulating component 12 when viewed from the axial direction of the screw shaft 4. However, the present invention is not limited to this. That is, the fixing member side elastic deformation portion 32 may be formed by, for example, processing a part of a portion overlapping the ball circulation component 12 as viewed from the axial direction of the screw shaft 4 to be thinner than the other portions.

(4)本実施形態のボールねじ1では、循環部品固定部材14の、固定部材側凸部22と固定部材側弾性変形部32との間の部分のうち、ねじ軸4の軸方向から見てボール循環部品12と重なる部分のナット8の径方向に沿った最大長さLmaxを、0.5mm以上としている。しかしながら、これに限定するものではなく、上記最大長さLmaxを、0.5mm未満としてもよい。
(5)本実施形態のボールねじ1では、樹脂材料を用いて形成した循環部品固定部材14の、ねじ軸4と対向する部分に、ねじ軸側軌道溝16と接触する循環部品固定部材側シール部34を形成したが、これに限定するものではない。すなわち、循環部品固定部材14のねじ軸4と対向する部分に、上記循環部品固定部材側シール部34を形成しない構成としてもよい。
(4) In the ball screw 1 of the present embodiment, the portion of the circulating component fixing member 14 between the fixing member side convex portion 22 and the fixing member side elastic deformation portion 32 is viewed from the axial direction of the screw shaft 4. The maximum length Lmax along the radial direction of the nut 8 that overlaps the ball circulation component 12 is 0.5 mm or more. However, the present invention is not limited to this, and the maximum length Lmax may be less than 0.5 mm.
(5) In the ball screw 1 of the present embodiment, the circulating component fixing member side seal that contacts the screw shaft side raceway groove 16 in the portion facing the screw shaft 4 of the circulating component fixing member 14 formed using a resin material. Although the part 34 was formed, it is not limited to this. In other words, the circulating component fixing member-side seal portion 34 may not be formed in a portion facing the screw shaft 4 of the circulating component fixing member 14.

(第二実施形態)
次に、本発明の第二実施形態(以下、「本実施形態」と記載する)について、図面を参照しつつ説明する。
(構成)
まず、図10から図12を用いて、本実施形態のボールねじ1の構成を説明する。
図10は、本実施形態の一例であるボールねじ1の一部を破断して示す図である。
図10中に示すように、本実施形態のボールねじ1は、ねじ軸4と、ナット8と、複数のボール10と、ボール循環部品12と、循環部品固定部材14と、潤滑剤供給体38と、潤滑剤供給体着脱部材40と、逸脱抑制部材42を備えている。
(Second embodiment)
Next, a second embodiment of the present invention (hereinafter referred to as “the present embodiment”) will be described with reference to the drawings.
(Constitution)
First, the structure of the ball screw 1 of this embodiment is demonstrated using FIGS. 10-12.
FIG. 10 is a view showing a part of a ball screw 1 which is an example of this embodiment in a cutaway manner.
As shown in FIG. 10, the ball screw 1 of the present embodiment includes a screw shaft 4, a nut 8, a plurality of balls 10, a ball circulation component 12, a circulation component fixing member 14, and a lubricant supplier 38. And a lubricant supply body attaching / detaching member 40 and a deviation suppressing member 42.

なお、ねじ軸4、ナット8、複数のボール10、ボール循環部品12及び循環部品固定部材14の構成は、上述した第一実施形態と同様であるため、以下の説明は、潤滑剤供給体38、潤滑剤供給体着脱部材40及び逸脱抑制部材42を中心に記載する。
潤滑剤供給体38は、円環状に形成されており、内周面をねじ軸4の外周面に摺接させた状態で、ナット8の両端部に配置されている。
また、潤滑剤供給体38は、潤滑剤を含有した樹脂材料を、射出成形等の成形手段により成形して形成されている。
In addition, since the structure of the screw shaft 4, the nut 8, the plurality of balls 10, the ball circulation component 12, and the circulation component fixing member 14 is the same as that of the first embodiment described above, the following description will be made with the lubricant supplier 38. The lubricant supply body attaching / detaching member 40 and the deviation suppressing member 42 will be mainly described.
The lubricant supply body 38 is formed in an annular shape, and is disposed at both ends of the nut 8 in a state where the inner peripheral surface is in sliding contact with the outer peripheral surface of the screw shaft 4.
The lubricant supplier 38 is formed by molding a resin material containing a lubricant by a molding means such as injection molding.

具体的には、潤滑剤供給体38は、潤滑剤含有ポリマであり、ポリエチレン、ポリプロピレン等のポリオレフィン系の合成樹脂に、ポリα−オレフィン油等のパラフィン系炭化水素油や、エーテル油、エステル油等の潤滑剤を単独または複数混合して混ぜ合わせた原料を、樹脂の融点以上に加熱して溶融した後に冷却して固化させることにより形成されている。これにより、潤滑剤供給体38の内周面とねじ軸4の外周面との摺接による摩擦熱等で、潤滑剤供給体38から潤滑油が滲み出すように形成されている。なお、潤滑剤供給体38は、上記のような構成以外にも、例えば、多孔質の樹脂材料または金属材料に、上記のような潤滑油を含浸させて形成してもよい。
潤滑剤供給体着脱部材40は、略円筒状に形成されており、その中空部分に、潤滑剤供給体38を収容して、ナット8の端部側へ着脱可能に取り付けられている。
Specifically, the lubricant supplier 38 is a lubricant-containing polymer, such as a polyolefin-based synthetic resin such as polyethylene or polypropylene, a paraffinic hydrocarbon oil such as poly-α-olefin oil, an ether oil, or an ester oil. A raw material obtained by mixing a mixture of lubricants such as a single or a plurality of lubricants is heated to a melting point or higher of the resin and then cooled and solidified. As a result, the lubricating oil oozes out from the lubricant supply body 38 by frictional heat or the like due to sliding contact between the inner peripheral surface of the lubricant supply body 38 and the outer peripheral surface of the screw shaft 4. In addition to the above-described configuration, the lubricant supply body 38 may be formed, for example, by impregnating a porous resin material or a metal material with the above-described lubricating oil.
The lubricant supply body attaching / detaching member 40 is formed in a substantially cylindrical shape. The lubricant supply body 38 is accommodated in the hollow portion of the lubricant supply body attaching / detaching member 40 so as to be detachably attached to the end side of the nut 8.

また、潤滑剤供給体着脱部材40は、ナット8の端部へボール循環部品12を間に挟んで取り付けて、ボール循環部品12をナット8の端部に固定する。
潤滑剤供給体着脱部材40の、ナット8とナット8の径方向で対向する部分(以下、「着脱部材側ナット対向部40a」と記載する)には、ねじ軸4の軸方向から見てナット8側へ突出する着脱部材側凸部44を形成している。具体的には、潤滑剤供給体着脱部材40には、二箇所の着脱部材側凸部44が形成されており、これら二箇所の着脱部材側凸部44は、ねじ軸4の中心軸線を挟んで互いに正対する位置に配置されている。
Further, the lubricant supply body attaching / detaching member 40 is attached to the end of the nut 8 with the ball circulating component 12 interposed therebetween, and fixes the ball circulating component 12 to the end of the nut 8.
A portion of the lubricant supply member attaching / detaching member 40 that faces the nut 8 in the radial direction of the nut 8 (hereinafter referred to as “attaching / detaching member side nut facing portion 40 a”) is a nut as viewed from the axial direction of the screw shaft 4. A detachable member-side convex portion 44 projecting to the 8 side is formed. Specifically, the lubricant supply body attaching / detaching member 40 is formed with two attaching / detaching member side protrusions 44, and these two attaching / detaching member side protrusions 44 sandwich the central axis of the screw shaft 4. Are arranged at positions facing each other.

これに対し、ナット8の、潤滑剤供給体着脱部材40とナット8の径方向で対向する部分(以下、「ナット側対向部8a」と記載する)には、着脱部材側凸部44が嵌合するナット側凹部24を形成している。このナット側凹部24は、上述した第一実施形態と同様の構成である。
逸脱抑制部材42は、エラストマー等の樹脂材料を用いて、板状に形成されている。なお、逸脱抑制部材42の形状は、上述した第一実施形態のボールねじ1が備える循環部品固定部材14と同一形状である。
On the other hand, the detachable member-side convex portion 44 is fitted to the portion of the nut 8 that faces the lubricant supply body detachable member 40 in the radial direction of the nut 8 (hereinafter referred to as “nut-side facing portion 8a”). The nut side recessed part 24 to match is formed. This nut side recessed part 24 is the structure similar to 1st embodiment mentioned above.
The deviation suppressing member 42 is formed in a plate shape using a resin material such as an elastomer. In addition, the shape of the deviation suppression member 42 is the same shape as the circulating component fixing member 14 provided in the ball screw 1 of the first embodiment described above.

また、逸脱抑制部材42は、潤滑剤供給体38を収容した潤滑剤供給体着脱部材40に対し、潤滑剤供給体38を間に挟んで、ナット8の端面と対向させて取り付けて、潤滑剤供給体着脱部材40からの潤滑剤供給体38の逸脱を抑制する。
逸脱抑制部材42の、潤滑剤供給体着脱部材40とナット8の径方向で対向する部分(以下、「逸脱抑制部材対向部42a」と記載する)には、ねじ軸4の軸方向から見て潤滑剤供給体着脱部材40側へ突出する逸脱抑制部材側凸部46を形成している。具体的には、逸脱抑制部材42には、二箇所の逸脱抑制部材側凸部46が形成されており、これら二箇所の逸脱抑制部材側凸部46は、ねじ軸4の中心軸線を挟んで互いに正対する位置に配置されている。
Further, the deviation suppressing member 42 is attached to the lubricant supply body attaching / detaching member 40 containing the lubricant supply body 38 so as to face the end surface of the nut 8 with the lubricant supply body 38 interposed therebetween. The deviation of the lubricant supply body 38 from the supply body attaching / detaching member 40 is suppressed.
A portion of the deviation suppressing member 42 that faces the lubricant supply body attaching / detaching member 40 in the radial direction of the nut 8 (hereinafter referred to as “deviation suppressing member facing portion 42 a”) is viewed from the axial direction of the screw shaft 4. A deviation suppressing member side convex portion 46 that protrudes toward the lubricant supply body attaching / detaching member 40 side is formed. Specifically, the deviation suppressing member 42 is formed with two deviation suppressing member side convex portions 46, and the two deviation suppressing member side convex portions 46 sandwich the central axis of the screw shaft 4. It arrange | positions in the position which mutually opposes.

これに対し、潤滑剤供給体着脱部材40の、逸脱抑制部材42とナット8の径方向で対向する部分(以下、「着脱部材側抑制部材対向部40b」と記載する)には、逸脱抑制部材側凸部46が嵌合する着脱部材側凹部48を形成している。したがって、潤滑剤供給体着脱部材40には、二箇所の着脱部材側凹部48が形成されており、これら二箇所の着脱部材側凹部48は、二箇所の逸脱抑制部材側凸部46と同様、ねじ軸4の中心軸線を挟んで互いに正対する位置に配置されている。   In contrast, the portion of the lubricant supply member attaching / detaching member 40 that faces the departure suppressing member 42 in the radial direction of the nut 8 (hereinafter, referred to as “detaching member side suppressing member facing portion 40b”) has a departure suppressing member. A detachable member-side concave portion 48 into which the side convex portion 46 is fitted is formed. Therefore, the lubricant supply body attaching / detaching member 40 is formed with two attaching / detaching member side recesses 48, and these two attaching / detaching member side recesses 48 are the same as the two deviation suppressing member side protrusions 46. It arrange | positions in the position which mutually opposes on both sides of the center axis line of the screw shaft 4. FIG.

図11は、潤滑剤供給体着脱部材40の構成を示す図である。なお、図11(a)は、潤滑剤供給体着脱部材40の正面図であり、図11(b)は、図11(a)のB線矢視図である。また、図11(c)は、図11(a)のC線矢視図であり、図11(b)は、潤滑剤供給体着脱部材40の斜視図である。
図11中に示すように、潤滑剤供給体着脱部材40は、ねじ軸4を挿通させる着脱部材側ねじ軸挿通孔50と、着脱部材側弾性変形部52を備えている。
FIG. 11 is a diagram illustrating a configuration of the lubricant supply body attaching / detaching member 40. In addition, Fig.11 (a) is a front view of the lubricant supply body attachment / detachment member 40, and FIG.11 (b) is a B line arrow directional view of Fig.11 (a). FIG. 11C is a view taken in the direction of arrow C in FIG. 11A, and FIG. 11B is a perspective view of the lubricant supply body attaching / detaching member 40.
As shown in FIG. 11, the lubricant supply body attaching / detaching member 40 includes an attaching / detaching member side screw shaft insertion hole 50 through which the screw shaft 4 is inserted, and an attaching / detaching member side elastic deformation portion 52.

着脱部材側弾性変形部52は、潤滑剤供給体着脱部材40のうち、ねじ軸4の軸方向から見てボール循環部品12と重なる部分の一部を貫通する開口部である。具体的には、着脱部材側ねじ軸挿通孔50と着脱部材側凸部44との間において、ナット8の周方向に延在させて形成した長孔である。そして、着脱部材側ナット対向部40aのうち、着脱部材側凸部44を形成した部分をねじ軸4側へ押圧すると、その開口面積がナット8の径方向に減少することにより、着脱部材側ナット対向部40aのうち、着脱部材側凸部44を形成した部分を弾性変形させることが可能となる。   The attaching / detaching member-side elastic deformation portion 52 is an opening that penetrates a part of the lubricant supplier attaching / detaching member 40 that overlaps the ball circulation component 12 when viewed from the axial direction of the screw shaft 4. Specifically, it is a long hole formed to extend in the circumferential direction of the nut 8 between the detachable member side screw shaft insertion hole 50 and the detachable member side convex portion 44. And when the part which formed the attachment / detachment member side convex part 44 in the attachment / detachment member side nut opposing part 40a is pressed to the screw shaft 4 side, the opening area will reduce in the radial direction of the nut 8, and the attachment / detachment member side nut Of the facing portion 40a, the portion where the detachable member-side convex portion 44 is formed can be elastically deformed.

これにより、着脱部材側弾性変形部52は、着脱部材側ナット対向部40aの一部を弾性変形させて、着脱部材側凸部44を、ナット8の径方向にねじ軸4側へ変位可能に形成されている。
また、特に図示しないが、本実施形態のボールねじ1では、潤滑剤供給体着脱部材40の、着脱部材側凸部44と着脱部材側弾性変形部52との間の部分のうち、ねじ軸4の軸方向から見てボール循環部品12と重なる部分の、ナット8の径方向に沿った最大長さを、0.5mm以上としている(図6参照)。これは、上述した第一実施形態における、循環部品固定部材の、固定部材側凸部と固定部材側弾性変形部との間の部分のうち、ねじ軸の軸方向から見てボール循環部品と重なる部分の、ナットの径方向に沿った最大長さと同様である。
Thereby, the detachable member side elastic deformation portion 52 can elastically deform a part of the detachable member side nut facing portion 40a so that the detachable member side convex portion 44 can be displaced in the radial direction of the nut 8 toward the screw shaft 4 side. Is formed.
Although not particularly illustrated, in the ball screw 1 of the present embodiment, the screw shaft 4 of the portion between the detachable member side convex portion 44 and the detachable member side elastically deforming portion 52 of the lubricant supply body detachable member 40. The maximum length along the radial direction of the nut 8 at the portion overlapping the ball circulation component 12 when viewed from the axial direction is 0.5 mm or more (see FIG. 6). This overlaps with the ball circulation component as seen from the axial direction of the screw shaft in the portion between the fixed member side convex portion and the fixed member side elastic deformation portion of the circulation component fixing member in the first embodiment described above. This is the same as the maximum length of the portion along the radial direction of the nut.

図12は、図10のXII線矢視図である。
図12中に示すように、潤滑剤供給体着脱部材40は、ねじ軸4の軸方向から見て、ボール循環部品(図示せず)の一部と重なる着脱部材側循環部品押え部40cと、着脱部材側循環部品押え部から突出するとともにナット8の端部の一部と重なる着脱部材側循環部品固定部40dを備えている。
12 is a view taken in the direction of arrow XII in FIG.
As shown in FIG. 12, the lubricant supply body attaching / detaching member 40 includes an attaching / detaching member-side circulating component pressing portion 40c that overlaps with a part of a ball circulating component (not shown) when viewed from the axial direction of the screw shaft 4. An attachment / detachment member-side circulation component fixing portion 40d that protrudes from the attachment / detachment member-side circulation component pressing portion and overlaps a part of the end of the nut 8 is provided.

ここで、潤滑剤供給体着脱部材40のうち、潤滑剤供給体着脱部材40に要求される機能を発揮するために必要な部分は、ボール循環部品12をナット8の端部に固定するための部分、具体的には、ボール循環部品12を間に挟んでナット8の端部と対向する部分と、着脱部材側凸部44を形成した部分である。このため、潤滑剤供給体着脱部材40のうち、ボール循環部品12をナット8の端部に固定するための部分以外の一部を、ナット8の端部と重ならない形状としても、潤滑剤供給体着脱部材40に要求される機能を発揮することが可能である。したがって、本実施形態では、潤滑剤供給体着脱部材40を、ねじ軸4の軸方向から見てボール循環部品12と重なる部分以外の一部が、ボール循環部品12と重なる部分よりもねじ軸4の中心からの距離が短い形状に形成している。   Here, in the lubricant supply body attaching / detaching member 40, a part necessary for performing the function required for the lubricant supply body attaching / detaching member 40 is for fixing the ball circulation component 12 to the end of the nut 8. A portion, specifically, a portion facing the end of the nut 8 with the ball circulation component 12 interposed therebetween, and a portion where the detachable member side convex portion 44 is formed. For this reason, even if a part of the lubricant supply body attaching / detaching member 40 other than the part for fixing the ball circulation component 12 to the end of the nut 8 is formed so as not to overlap the end of the nut 8, the lubricant supply The function required for the body attaching / detaching member 40 can be exhibited. Therefore, in the present embodiment, the lubricant supply body attaching / detaching member 40 has a part other than the part overlapping the ball circulation part 12 as viewed from the axial direction of the screw shaft 4 than the part overlapping the ball circulation part 12. The distance from the center is short.

また、特に図示しないが、ナット8の形状は、ねじ軸4の軸方向から見て、潤滑剤供給体着脱部材40及びナット側軌道溝18と重なる部分以外の一部が、潤滑剤供給体着脱部材40と重なる部分よりも、ねじ軸4の中心からの距離が短い形状である。なお、本実施形態では、ナット8のねじ軸4の軸方向から見た形状と、潤滑剤供給体着脱部材40のねじ軸4の軸方向から見た形状とを、同一形状としている。
また、図12中に示すように、逸脱抑制部材42の形状は、ねじ軸4の軸方向から見て、逸脱抑制部材42全体が潤滑剤供給体着脱部材40と重なる形状である。
また、図12中に示すように、逸脱抑制部材42は、ねじ軸4を挿通させる逸脱抑制部材側ねじ軸挿通孔54と、逸脱抑制部材側弾性変形部56を備えている。
Although not particularly shown, the shape of the nut 8 is such that a part of the nut 8 other than the portion overlapping the lubricant supply member attaching / detaching member 40 and the nut side raceway groove 18 is attached / detached with the lubricant supply member as viewed from the axial direction of the screw shaft 4. The distance from the center of the screw shaft 4 is shorter than the portion overlapping the member 40. In the present embodiment, the shape seen from the axial direction of the screw shaft 4 of the nut 8 and the shape seen from the axial direction of the screw shaft 4 of the lubricant supply body attaching / detaching member 40 are the same shape.
Further, as shown in FIG. 12, the shape of the departure suppressing member 42 is a shape in which the entire departure suppressing member 42 overlaps the lubricant supply body attaching / detaching member 40 when viewed from the axial direction of the screw shaft 4.
Further, as shown in FIG. 12, the departure suppressing member 42 includes a departure suppressing member side screw shaft insertion hole 54 through which the screw shaft 4 is inserted, and a departure suppressing member side elastic deformation portion 56.

逸脱抑制部材側弾性変形部56は、逸脱抑制部材42のうち、ねじ軸4の軸方向から見てボール循環部品12と重なる部分の一部を貫通する開口部である。具体的には、逸脱抑制部材側ねじ軸挿通孔54と逸脱抑制部材側凸部46との間において、ナット8の周方向に延在させて形成した長孔である。そして、逸脱抑制部材対向部42aのうち、逸脱抑制部材側凸部46を形成した部分をねじ軸4側へ押圧すると、その開口面積がナット8の径方向に減少することにより、逸脱抑制部材対向部42aのうち、逸脱抑制部材側凸部46を形成した部分を弾性変形させることが可能となる。   The departure restraining member side elastic deformation portion 56 is an opening that penetrates a part of the departure restraining member 42 that overlaps the ball circulation component 12 when viewed from the axial direction of the screw shaft 4. Specifically, it is a long hole formed to extend in the circumferential direction of the nut 8 between the deviation suppressing member side screw shaft insertion hole 54 and the deviation suppressing member side convex portion 46. And when the part which formed the deviation control member side convex part 46 among the deviation control member opposing parts 42a is pressed to the screw-shaft 4 side, the opening area will reduce in the radial direction of the nut 8, and a deviation control member opposition will be carried out. Of the portion 42a, it is possible to elastically deform the portion where the deviation suppressing member side convex portion 46 is formed.

これにより、固定部材側弾性変形部32は、逸脱抑制部材対向部42aの一部を弾性変形させて、逸脱抑制部材側凸部46を、ナット8の径方向にねじ軸4側へ変位可能に形成されている。
また、特に図示しないが、逸脱抑制部材42のねじ軸4と対向する部分には、ねじ軸側軌道溝16と接触する逸脱抑制部材側シール部を形成している。
逸脱抑制部材側シール部は、ねじ軸側軌道溝16へ向かうほど断面積が薄くなるように形成されており、ナット8の周方向に沿って、ねじ軸側軌道溝16の形状に対応する螺旋状をなしている(図7参照)。これは、上述した第一実施形態における、循環部品固定部材側シール部と同様の構成である。
その他の構成は、上述した第一実施形態と同様である。
As a result, the fixed member side elastic deformation portion 32 elastically deforms a part of the departure suppressing member facing portion 42 a so that the departure suppressing member side convex portion 46 can be displaced in the radial direction of the nut 8 toward the screw shaft 4. Is formed.
Although not particularly shown, a deviation restraining member side seal portion that contacts the screw shaft side raceway groove 16 is formed in a portion of the deviation restraining member 42 facing the screw shaft 4.
The deviation suppressing member side seal portion is formed so that the cross-sectional area becomes thinner toward the screw shaft side raceway groove 16, and the spiral corresponding to the shape of the screw shaft side raceway groove 16 along the circumferential direction of the nut 8. (See FIG. 7). This is the same configuration as the circulating component fixing member side seal portion in the first embodiment described above.
Other configurations are the same as those of the first embodiment described above.

(作用)
次に、図10から図12を参照しつつ、本実施形態のボールねじ1の作用について説明する。なお、上述した第一実施形態と同様の作用については、詳細な説明を省略する。
まず、ナット8の端部にボール循環部品12を固定する作業について説明する。
ナット8の端部にボール循環部品12を固定する際には、ナット8の端部に形成された循環部品嵌合部36内に、ボール循環部品12を挿入する(図8参照)。
循環部品嵌合部36内にボール循環部品12を挿入した後、着脱部材側凸部44をナット側凹部24に嵌合させて、潤滑剤供給体着脱部材40を、ボール循環部品12を間に挟んでナット8の端部に取り付ける。これにより、ボール循環部品12を、ナット8の端部に固定する。
(Function)
Next, the operation of the ball screw 1 of the present embodiment will be described with reference to FIGS. 10 to 12. In addition, detailed description is abbreviate | omitted about the effect | action similar to 1st embodiment mentioned above.
First, the operation of fixing the ball circulation component 12 to the end of the nut 8 will be described.
When the ball circulating component 12 is fixed to the end of the nut 8, the ball circulating component 12 is inserted into the circulating component fitting portion 36 formed at the end of the nut 8 (see FIG. 8).
After the ball circulation component 12 is inserted into the circulation component fitting portion 36, the detachable member side convex portion 44 is fitted into the nut side concave portion 24, and the lubricant supply body detachable member 40 is interposed between the ball circulation component 12 and the like. Attach to the end of the nut 8 with pinching. Thereby, the ball circulation component 12 is fixed to the end portion of the nut 8.

ここで、着脱部材側凸部44をナット側凹部24に嵌合させる際には、潤滑剤供給体着脱部材40のうち、ねじ軸4の中心からの距離が短い部分と、ナット8のうち、ねじ軸4の中心からの距離が短い部分とを、ねじ軸4の軸方向から見て、同じ方向へ向けて配置する。すなわち、潤滑剤供給体着脱部材40のうち、ねじ軸4の軸方向から見た最小幅の部分と、ナット8のうち、ねじ軸4の軸方向から見た最小幅の部分とを、ねじ軸4の軸方向から見て、同じ方向へ向けて配置する。   Here, when fitting the detachable member-side convex portion 44 to the nut-side concave portion 24, the portion of the lubricant supply body detachable member 40 that is short from the center of the screw shaft 4 and the nut 8, A portion having a short distance from the center of the screw shaft 4 is disposed in the same direction as viewed from the axial direction of the screw shaft 4. That is, the portion of the lubricant supply body attaching / detaching member 40 having the minimum width viewed from the axial direction of the screw shaft 4 and the portion of the nut 8 having the minimum width viewed from the axial direction of the screw shaft 4 are 4 are arranged in the same direction as seen from the axial direction.

また、着脱部材側凸部44をナット側凹部24に嵌合させる際には、着脱部材側ナット対向部40aのうち、着脱部材側凸部44を形成した部分をねじ軸4側へ押圧して、着脱部材側弾性変形部52の開口面積を、ナット8の径方向に減少させる。これにより、着脱部材側ナット対向部40aのうち、着脱部材側凸部44を形成した部分を弾性変形させ、着脱部材側凸部44をねじ軸4側へ変位させる。そして、着脱部材側凸部44をねじ軸4側へ変位させた潤滑剤供給体着脱部材40を、ナット8の端部に配置し、着脱部材側凸部44とナット側凹部24とをナット8の径方向で対向させた後、潤滑剤供給体着脱部材40のうち弾性変形させた部分の形状を復元させて、着脱部材側凸部44をナット側凹部24に嵌合させる。   Further, when fitting the detachable member side convex portion 44 to the nut side concave portion 24, the portion of the detachable member side nut facing portion 40a where the detachable member side convex portion 44 is formed is pressed toward the screw shaft 4 side. The opening area of the detachable member side elastic deformation portion 52 is reduced in the radial direction of the nut 8. Thereby, the part which formed the detachable member side convex part 44 among the detachable member side nut opposing parts 40a is elastically deformed, and the detachable member side convex part 44 is displaced to the screw shaft 4 side. Then, the lubricant supply body attaching / detaching member 40 in which the attaching / detaching member side convex portion 44 is displaced to the screw shaft 4 side is disposed at the end of the nut 8, and the attaching / detaching member side convex portion 44 and the nut side concave portion 24 are connected to the nut 8. Then, the shape of the elastically deformed portion of the lubricant supply body attaching / detaching member 40 is restored, and the attaching / detaching member side convex portion 44 is fitted into the nut side concave portion 24.

以上により、本実施形態のボールねじ1では、潤滑剤供給体着脱部材40及びナット8の、ねじ軸4の軸方向から見た最小幅の部分を、ねじ軸4の軸方向から見て、同じ方向へ向けて配置する。このため、ナット8の、ねじ軸4の軸方向から見た最小幅の部分を、ナット8全体の最小幅とすることが可能となる。
また、本実施形態のボールねじ1では、着脱部材側凸部44をナット側凹部24に嵌合させて、潤滑剤供給体着脱部材40を、ボール循環部品12を間に挟んでナット8の端部に取り付けることにより、ボール循環部品12を、ナット8の端部に固定する。このため、潤滑剤供給体着脱部材40のナット8の端部への取り付けが容易となるとともに、潤滑剤供給体着脱部材40がナット8の端部から外れることを抑制することが可能となる。
As described above, in the ball screw 1 of the present embodiment, the portions of the minimum width of the lubricant supply body attaching / detaching member 40 and the nut 8 viewed from the axial direction of the screw shaft 4 are the same when viewed from the axial direction of the screw shaft 4. Place it in the direction. For this reason, the minimum width portion of the nut 8 viewed from the axial direction of the screw shaft 4 can be set to the minimum width of the nut 8 as a whole.
Further, in the ball screw 1 of the present embodiment, the detachable member side convex portion 44 is fitted into the nut side concave portion 24, and the lubricant supply body detachable member 40 is sandwiched between the ball circulation parts 12 and the end of the nut 8. The ball circulation component 12 is fixed to the end of the nut 8 by attaching to the end. For this reason, it is possible to easily attach the lubricant supply body attaching / detaching member 40 to the end portion of the nut 8 and to prevent the lubricant supply body attaching / detaching member 40 from being detached from the end portion of the nut 8.

次に、潤滑剤供給体着脱部材40に逸脱抑制部材42を取り付ける作業について説明する。
潤滑剤供給体着脱部材40に逸脱抑制部材42を取り付ける際には、逸脱抑制部材側凸部46を着脱部材側凹部48に嵌合させる。
ここで、逸脱抑制部材側凸部46を着脱部材側凹部48に嵌合させる際には、逸脱抑制部材42を、逸脱抑制部材42全体が、ねじ軸4の軸方向から見て、潤滑剤供給体着脱部材40と重なる方向へ向けて配置する。
Next, an operation of attaching the deviation suppressing member 42 to the lubricant supply body attaching / detaching member 40 will be described.
When attaching the deviation suppressing member 42 to the lubricant supply body attaching / detaching member 40, the deviation suppressing member side convex portion 46 is fitted into the attaching / detaching member side concave portion 48.
Here, when the deviation suppressing member side convex portion 46 is fitted into the detachable member side concave portion 48, the deviation suppressing member 42 is viewed from the axial direction of the screw shaft 4 when the entire deviation suppressing member 42 is supplied. It arrange | positions toward the direction which overlaps with the body attaching / detaching member 40. FIG.

また、逸脱抑制部材側凸部46を着脱部材側凹部48に嵌合させる際には、逸脱抑制部材対向部42aのうち、逸脱抑制部材側凸部46を形成した部分をねじ軸4側へ押圧して、逸脱抑制部材側弾性変形部56の開口面積を、ナット8の径方向に減少させる。これにより、逸脱抑制部材対向部42aのうち、逸脱抑制部材側凸部46を形成した部分を弾性変形させ、逸脱抑制部材側凸部46をねじ軸4側へ変位させる。そして、ねじ軸4側へ変位させた逸脱抑制部材側凸部46と着脱部材側凹部48とをナット8の径方向で対向させた後、逸脱抑制部材42のうち弾性変形させた部分の形状を復元させて、逸脱抑制部材側凸部46を着脱部材側凹部48に嵌合させる。   Further, when the deviation suppressing member side convex portion 46 is fitted into the detachable member side concave portion 48, the portion of the deviation suppressing member facing portion 42 a where the deviation suppressing member side convex portion 46 is formed is pressed toward the screw shaft 4 side. Then, the opening area of the departure suppressing member side elastic deformation portion 56 is decreased in the radial direction of the nut 8. Thereby, the part which formed the deviation suppression member side convex part 46 among the deviation suppression member opposing parts 42a is elastically deformed, and the deviation suppression member side convex part 46 is displaced to the screw shaft 4 side. And after making the deviation suppression member side convex part 46 and the attachment / detachment member side recessed part 48 which were displaced to the screw-shaft 4 side oppose in the radial direction of the nut 8, the shape of the part elastically deformed among the deviation suppression members 42 is used. The deviation suppressing member side convex portion 46 is fitted into the detachable member side concave portion 48 by being restored.

以上により、本実施形態のボールねじ1では、逸脱抑制部材42を、逸脱抑制部材42全体が、ねじ軸4の軸方向から見て潤滑剤供給体着脱部材40の一部と重なる方向へ向けて配置このため、ナット8の、ねじ軸4の軸方向から見た最小幅の部分を、ナット8全体の最小幅とすることが可能となる。
また、本実施形態のボールねじ1では、逸脱抑制部材側凸部46を着脱部材側凹部48に嵌合させて、逸脱抑制部材42を潤滑剤供給体着脱部材40に取り付けることにより、潤滑剤供給体着脱部材40に収容した潤滑剤供給体38の逸脱を抑制する。このため、逸脱抑制部材42の潤滑剤供給体着脱部材40の端部への取り付けが容易となるとともに、逸脱抑制部材42が潤滑剤供給体着脱部材40から外れることを抑制することが可能となる。
As described above, in the ball screw 1 of the present embodiment, the departure suppressing member 42 is directed in a direction in which the entire departure suppressing member 42 overlaps a part of the lubricant supply body attaching / detaching member 40 when viewed from the axial direction of the screw shaft 4. For this reason, the minimum width portion of the nut 8 viewed from the axial direction of the screw shaft 4 can be set to the minimum width of the nut 8 as a whole.
Further, in the ball screw 1 of the present embodiment, the lubricant supply is achieved by fitting the deviation suppressing member side convex portion 46 to the detachable member side concave portion 48 and attaching the deviation suppressing member 42 to the lubricant supply member attaching / detaching member 40. Deviation of the lubricant supply body 38 accommodated in the body attaching / detaching member 40 is suppressed. For this reason, it is possible to easily attach the deviation suppressing member 42 to the end portion of the lubricant supplier attaching / detaching member 40 and to prevent the deviation suppressing member 42 from being detached from the lubricant supplier attaching / detaching member 40. .

(第二実施形態の効果)
以下、本実施形態のボールねじ1の効果を列挙する。
(1)本実施形態のボールねじ1では、潤滑剤供給体着脱部材40が、ねじ軸4の軸方向から見て、ボール循環部品12の一部と重なる着脱部材側循環部品押え部40cと、着脱部材側循環部品押え部40cから突出するとともにナット8の端部の一部と重なる着脱部材側循環部品固定部40dを備える。これに加え、ナット8の形状を、ねじ軸4の軸方向から見て、潤滑剤供給体着脱部材40及びナット側軌道溝18と重なる部分以外の一部が、潤滑剤供給体着脱部材40と重なる部分よりも、ねじ軸4の中心からの距離が短い形状とする。
(Effect of the second embodiment)
Hereinafter, effects of the ball screw 1 of the present embodiment will be listed.
(1) In the ball screw 1 of the present embodiment, the lubricant supply body attaching / detaching member 40 includes an attaching / detaching member side circulating component pressing portion 40c that overlaps with a part of the ball circulating component 12 when viewed from the axial direction of the screw shaft 4. An attachment / detachment member-side circulation component fixing portion 40d that protrudes from the attachment / detachment member-side circulation component pressing portion 40c and overlaps a part of the end of the nut 8 is provided. In addition to this, when the shape of the nut 8 is viewed from the axial direction of the screw shaft 4, a part other than the portion overlapping the lubricant supply body attaching / detaching member 40 and the nut side raceway groove 18 is formed with the lubricant supply body attaching / detaching member 40. The distance from the center of the screw shaft 4 is shorter than the overlapping portion.

このため、潤滑剤供給体着脱部材40を、ボール循環部品12をナット8の端部に固定するための部分を残して、ナット8の径方向に縮小させることが可能となる。これにより、ナット8の形状を、潤滑剤供給体着脱部材40を取り付けるための部分と、ボール10を転動させるための部分を残して、ナット8の径方向に縮小させた形状とすることが可能となる。
その結果、ねじ軸4の軸方向から見たナット8の幅を減少させて、ナット8を径方向に小型化することが可能となるため、ボールねじ1を備えるボールねじ装置を小型化することが可能となる。
また、ナット8を径方向に小型化することにより、ナット8の質量を減少させることが可能となるため、ボールねじ装置の駆動に用いる動力源を小型化することが可能となる。
For this reason, the lubricant supply body attaching / detaching member 40 can be reduced in the radial direction of the nut 8 leaving a portion for fixing the ball circulation component 12 to the end of the nut 8. As a result, the shape of the nut 8 may be reduced in the radial direction of the nut 8 leaving a portion for attaching the lubricant supply body attaching / detaching member 40 and a portion for rolling the ball 10. It becomes possible.
As a result, the width of the nut 8 as viewed from the axial direction of the screw shaft 4 can be reduced and the nut 8 can be downsized in the radial direction, so that the ball screw device including the ball screw 1 can be downsized. Is possible.
In addition, by reducing the size of the nut 8 in the radial direction, the mass of the nut 8 can be reduced, so that the power source used for driving the ball screw device can be reduced.

(2)本実施形態のボールねじ1では、着脱部材側ナット対向部40aに形成した着脱部材側凸部44を、ナット側対向部8aに形成したナット側凹部24に嵌合させることにより、潤滑剤供給体着脱部材40をナット8の端部へ取り付けることが可能となる。
このため、潤滑剤供給体着脱部材40をナット8の端部へ取り付けた状態で、潤滑剤供給体着脱部材40に、ナット8の周方向や径方向への外力が加わった場合でも、潤滑剤供給体着脱部材40がナット8の端部から外れることを抑制することが可能となる。
その結果、ボールねじ1の作動時において、ナット8の端部に固定したボール循環部品12の変位を抑制することが可能となり、ボールねじ1の作動に関する安定性を向上させることが可能となる。
(2) In the ball screw 1 of the present embodiment, lubrication is achieved by fitting the detachable member side convex portion 44 formed on the detachable member side nut facing portion 40a into the nut side concave portion 24 formed on the nut side facing portion 8a. The agent supply body attaching / detaching member 40 can be attached to the end of the nut 8.
Therefore, even when an external force in the circumferential direction or radial direction of the nut 8 is applied to the lubricant supply body attaching / detaching member 40 in a state where the lubricant supply body attaching / detaching member 40 is attached to the end portion of the nut 8. It is possible to suppress the supply body attaching / detaching member 40 from being detached from the end portion of the nut 8.
As a result, during the operation of the ball screw 1, it is possible to suppress the displacement of the ball circulation component 12 fixed to the end of the nut 8, and it is possible to improve the stability regarding the operation of the ball screw 1.

(3)本実施形態のボールねじ1では、潤滑剤供給体着脱部材40をナット8の端部へ取り付ける際に、着脱部材側弾性変形部52を弾性変形させることにより、着脱部材側凸部44を、ナット8の径方向にねじ軸4側へ変位させることが可能となる。
このため、潤滑剤供給体着脱部材40をナット8の端部へ取り付ける際に、着脱部材側凸部44を、ナット側凹部24よりもねじ軸4側へ変位させることが可能となり、着脱部材側凸部44をナット側凹部24へ嵌合させる作業が容易となる。
その結果、ナット8の組み立て作業が容易となり、ボールねじ1の組み立て作業に関する作業効率を向上させることが可能となる。
(3) In the ball screw 1 of the present embodiment, when the lubricant supply body attaching / detaching member 40 is attached to the end portion of the nut 8, the attaching / detaching member side elastic deformation portion 52 is elastically deformed, whereby the attaching / detaching member side convex portion 44 is provided. Can be displaced toward the screw shaft 4 in the radial direction of the nut 8.
For this reason, when attaching the lubricant supply body attaching / detaching member 40 to the end portion of the nut 8, the attaching / detaching member side convex portion 44 can be displaced to the screw shaft 4 side from the nut side recessed portion 24, and the attaching / detaching member side The operation | work which fits the convex part 44 to the nut side recessed part 24 becomes easy.
As a result, the assembling work of the nut 8 becomes easy, and the working efficiency related to the assembling work of the ball screw 1 can be improved.

(4)本実施形態のボールねじ1では、潤滑剤供給体着脱部材40の、着脱部材側凸部44と着脱部材側弾性変形部52との間の部分のうち、ねじ軸4の軸方向から見てボール循環部品12と重なる部分のナット8の径方向に沿った最大長さを、0.5mm以上としている。
このため、ボール循環部品12を通過するボール10によって衝撃が加わったボール循環部品12が、潤滑剤供給体着脱部材40をナット8の端面から外れる方向へ押圧しても、ボール循環部品12が潤滑剤供給体着脱部材40へ加える押圧力を抑制することが可能となる。
その結果、ボールねじ1の作動時において、潤滑剤供給体着脱部材40の変形を抑制することが可能となり、潤滑剤供給体着脱部材40のナット8の端面からの脱落を抑制することが可能となるため、ボールねじ1の作動に関する安定性を向上させることが可能となる。
(4) In the ball screw 1 of the present embodiment, from the axial direction of the screw shaft 4 in the portion between the attaching / detaching member side convex portion 44 and the attaching / detaching member side elastic deformation portion 52 of the lubricant supply member attaching / detaching member 40. The maximum length along the radial direction of the nut 8 that overlaps the ball circulating component 12 as viewed is 0.5 mm or more.
For this reason, even if the ball circulation component 12 subjected to an impact by the ball 10 passing through the ball circulation component 12 presses the lubricant supply body attaching / detaching member 40 in the direction away from the end face of the nut 8, the ball circulation component 12 is lubricated. The pressing force applied to the agent supply body attaching / detaching member 40 can be suppressed.
As a result, it is possible to suppress the deformation of the lubricant supply body attaching / detaching member 40 during the operation of the ball screw 1 and to prevent the lubricant supply body attaching / detaching member 40 from dropping from the end face of the nut 8. Therefore, it is possible to improve the stability related to the operation of the ball screw 1.

(5)本実施形態のボールねじ1では、逸脱抑制部材42の形状を、ねじ軸4の軸方向から見て、逸脱抑制部材42全体が潤滑剤供給体着脱部材40の一部と重なる形状とする。
このため、逸脱抑制部材42を、潤滑剤供給体38の逸脱を抑制するための部分を残して、ねじ軸4の軸方向から見て潤滑剤供給体着脱部材40よりも突出しない形状とすることが可能となる。
その結果、ねじ軸4の軸方向から見た逸脱抑制部材42の最小幅を、ねじ軸4の軸方向から見たナット8の最小幅以下とすることが可能となる。
(5) In the ball screw 1 of the present embodiment, the shape of the departure suppressing member 42 is a shape in which the entire departure suppressing member 42 overlaps a part of the lubricant supply body attaching / detaching member 40 when viewed from the axial direction of the screw shaft 4. To do.
For this reason, the deviation suppressing member 42 is formed in a shape that does not protrude from the lubricant supply body attaching / detaching member 40 when viewed from the axial direction of the screw shaft 4, leaving a portion for suppressing the deviation of the lubricant supply body 38. Is possible.
As a result, the minimum width of the deviation suppressing member 42 viewed from the axial direction of the screw shaft 4 can be made equal to or smaller than the minimum width of the nut 8 viewed from the axial direction of the screw shaft 4.

(6)本実施形態のボールねじ1では、逸脱抑制部材対向部42aに形成した逸脱抑制部材側凸部46を、着脱部材側抑制部材対向部40bに形成した着脱部材側凹部48に嵌合させることにより、逸脱抑制部材42を潤滑剤供給体着脱部材40へ取り付けることが可能となる。
このため、逸脱抑制部材42を潤滑剤供給体着脱部材40へ取り付けた状態で、逸脱抑制部材42に、ナット8の周方向や径方向への外力が加わった場合でも、逸脱抑制部材42が潤滑剤供給体着脱部材40から外れることを抑制することが可能となる。
その結果、ボールねじ1の作動時において、潤滑剤供給体着脱部材40に収容した潤滑剤供給体38の逸脱を抑制することが可能となり、ボールねじ1の作動性及び耐久性を向上させることが可能となる。
(6) In the ball screw 1 of this embodiment, the deviation suppressing member side convex portion 46 formed on the deviation suppressing member facing portion 42a is fitted into the detachable member side concave portion 48 formed on the detachable member side suppressing member facing portion 40b. Thus, the deviation suppressing member 42 can be attached to the lubricant supply body attaching / detaching member 40.
Therefore, even when an external force in the circumferential direction or the radial direction of the nut 8 is applied to the deviation suppressing member 42 with the deviation suppressing member 42 attached to the lubricant supply body attaching / detaching member 40, the deviation suppressing member 42 is lubricated. It is possible to prevent the agent supply body attaching / detaching member 40 from coming off.
As a result, it is possible to suppress the deviation of the lubricant supply body 38 accommodated in the lubricant supply body attaching / detaching member 40 during the operation of the ball screw 1, and the operability and durability of the ball screw 1 can be improved. It becomes possible.

(7)本実施形態のボールねじ1では、逸脱抑制部材42を潤滑剤供給体着脱部材40へ取り付ける際に、逸脱抑制部材側弾性変形部56を弾性変形させることにより、逸脱抑制部材側凸部46を、ナット8の径方向にねじ軸4側へ変位させることが可能となる。
このため、逸脱抑制部材42を潤滑剤供給体着脱部材40へ取り付ける際に、逸脱抑制部材側凸部46を、着脱部材側凹部48よりもねじ軸4側へ変位させることが可能となり、逸脱抑制部材側凸部46を着脱部材側凹部48へ嵌合させる作業が容易となる。
その結果、ナット8の組み立て作業が容易となり、ボールねじ1の組み立て作業に関する作業効率を向上させることが可能となる。
(7) In the ball screw 1 of the present embodiment, when the departure suppressing member 42 is attached to the lubricant supply body attaching / detaching member 40, the departure suppressing member side convex portion is formed by elastically deforming the departure suppressing member side elastic deformation portion 56. 46 can be displaced toward the screw shaft 4 in the radial direction of the nut 8.
For this reason, when attaching the deviation suppressing member 42 to the lubricant supply body attaching / detaching member 40, the deviation suppressing member side convex portion 46 can be displaced to the screw shaft 4 side rather than the attaching / detaching member side concave portion 48. The operation | work which fits the member side convex part 46 to the detachable member side recessed part 48 becomes easy.
As a result, the assembling work of the nut 8 becomes easy, and the working efficiency related to the assembling work of the ball screw 1 can be improved.

(8)本実施形態のボールねじ1では、樹脂材料を用いて形成した逸脱抑制部材42の、ねじ軸4と対向する部分に、ねじ軸側軌道溝16と接触する逸脱抑制部材側シール部を形成する。
このため、潤滑剤供給体着脱部材40とねじ軸側軌道溝16との間に形成される隙間を、逸脱抑制部材側シール部で閉塞することが可能となり、潤滑剤供給体38とねじ軸4の外周面との間への異物の侵入を抑制することが可能となる。
その結果、潤滑剤供給体38からねじ軸4の外周面への潤滑剤の供給が阻害されることを抑制することが可能となるため、ボールねじ1の作動性及び耐久性を向上させることが可能となる。
(8) In the ball screw 1 of the present embodiment, the deviation suppressing member side seal portion that comes into contact with the screw shaft side raceway groove 16 is provided on the portion of the deviation suppressing member 42 formed using a resin material, facing the screw shaft 4. Form.
For this reason, the gap formed between the lubricant supply body attaching / detaching member 40 and the screw shaft side raceway groove 16 can be closed by the deviation suppressing member side seal portion, and the lubricant supply body 38 and the screw shaft 4 can be closed. It is possible to suppress the intrusion of foreign matter between the outer peripheral surface of the two.
As a result, it is possible to suppress the supply of the lubricant from the lubricant supply body 38 to the outer peripheral surface of the screw shaft 4, thereby improving the operability and durability of the ball screw 1. It becomes possible.

(応用例)
以下、本実施形態のボールねじ1の応用例を列挙する。
(1)本実施形態のボールねじ1では、着脱部材側ナット対向部40aに着脱部材側凸部44を形成するとともに、ナット側対向部8aにナット側凹部24を形成し、着脱部材側凸部44をナット側凹部24に嵌合させることにより、潤滑剤供給体着脱部材40をナット8の端部へ取り付けたが、これに限定するものではない。すなわち、例えば、潤滑剤供給体着脱部材40をナット8の端部に配置した状態で、潤滑剤供給体着脱部材40及びナット8をナット8の径方向へ貫通するボルト等を用いて、潤滑剤供給体着脱部材40をナット8の端部へ取り付けてもよい。
(Application examples)
Hereinafter, application examples of the ball screw 1 of the present embodiment will be listed.
(1) In the ball screw 1 of the present embodiment, the detachable member-side convex portion 44 is formed on the detachable member-side nut facing portion 40a, and the nut-side concave portion 24 is formed on the nut-side facing portion 8a. Although the lubricant supply body attaching / detaching member 40 is attached to the end portion of the nut 8 by fitting 44 to the nut-side recess 24, the present invention is not limited to this. That is, for example, in a state where the lubricant supply body attaching / detaching member 40 is disposed at the end of the nut 8, the lubricant supply body attaching / detaching member 40 and a bolt that penetrates the nut 8 in the radial direction of the nut 8 are used. The supply body attaching / detaching member 40 may be attached to the end of the nut 8.

(2)本実施形態のボールねじ1では、潤滑剤供給体着脱部材40の構成を、着脱部材側弾性変形部52を備える構成としたが、これに限定するものではなく、潤滑剤供給体着脱部材40の構成を、着脱部材側弾性変形部52を備えていない構成としてもよい。この場合、潤滑剤供給体着脱部材40をナット8の端部へ取り付ける際には、例えば、潤滑剤供給体着脱部材40のナット8と対向する面全体を湾曲させて、着脱部材側凸部44をナット側凹部24に嵌合させる。
(3)本実施形態のボールねじ1では、着脱部材側弾性変形部52を、潤滑剤供給体着脱部材40のうち、ねじ軸4の軸方向から見てボール循環部品12と重なる部分の一部を貫通する開口部としたが、これに限定するものではない。すなわち、着脱部材側弾性変形部52を、例えば、ねじ軸4の軸方向から見てボール循環部品12と重なる部分の一部を、他の部分よりも薄肉に加工して形成してもよい。
(2) In the ball screw 1 of the present embodiment, the configuration of the lubricant supply body attaching / detaching member 40 includes the attachable / detachable member-side elastic deformation portion 52, but is not limited thereto, and the lubricant supply body attaching / detaching is not limited thereto. The configuration of the member 40 may be a configuration in which the detachable member-side elastic deformation portion 52 is not provided. In this case, when attaching the lubricant supply body attaching / detaching member 40 to the end portion of the nut 8, for example, the entire surface of the lubricant supply body attaching / detaching member 40 facing the nut 8 is curved so that the attaching / detaching member side convex portion 44 is provided. Is fitted into the nut-side recess 24.
(3) In the ball screw 1 of the present embodiment, the detachable member-side elastically deformable portion 52 is part of a portion of the lubricant supplier detachable member 40 that overlaps the ball circulation component 12 when viewed from the axial direction of the screw shaft 4. However, the present invention is not limited to this. That is, the detachable member-side elastic deformation portion 52 may be formed by, for example, processing a part of a portion overlapping the ball circulation component 12 as viewed from the axial direction of the screw shaft 4 to be thinner than the other portions.

(4)本実施形態のボールねじ1では、潤滑剤供給体着脱部材40の、着脱部材側凸部44と着脱部材側弾性変形部52との間の部分のうち、ねじ軸4の軸方向から見てボール循環部品12と重なる部分のナット8の径方向に沿った最大長さを、0.5mm以上としている。しかしながら、これに限定するものではなく、上記最大長さを、0.5mm未満としてもよい。
(5)本実施形態のボールねじ1では、潤滑剤供給体38の逸脱を抑制する逸脱抑制部材42を備える構成としたが、これに限定するものではない。すなわち、例えば、潤滑剤供給体38を潤滑剤供給体着脱部材40に収容した状態で、潤滑剤供給体38及び潤滑剤供給体着脱部材40をナット8の径方向へ貫通するボルト等を用いて、逸脱抑制部材42を潤滑剤供給体着脱部材40へ取り付けることにより、潤滑剤供給体38の逸脱を抑制してもよい。
(4) In the ball screw 1 of the present embodiment, from the axial direction of the screw shaft 4 in the portion between the attaching / detaching member side convex portion 44 and the attaching / detaching member side elastic deformation portion 52 of the lubricant supply member attaching / detaching member 40. The maximum length along the radial direction of the nut 8 that overlaps the ball circulating component 12 as viewed is 0.5 mm or more. However, the present invention is not limited to this, and the maximum length may be less than 0.5 mm.
(5) Although the ball screw 1 of the present embodiment includes the deviation suppressing member 42 that suppresses the deviation of the lubricant supplier 38, the invention is not limited thereto. That is, for example, a bolt or the like that penetrates the lubricant supply body 38 and the lubricant supply body attaching / detaching member 40 in the radial direction of the nut 8 in a state where the lubricant supply body 38 is accommodated in the lubricant supply body attaching / detaching member 40. The deviation of the lubricant supply body 38 may be suppressed by attaching the deviation suppression member 42 to the lubricant supply body attaching / detaching member 40.

(6)本実施形態のボールねじ1では、逸脱抑制部材対向部42aに逸脱抑制部材側凸部46を形成するとともに、着脱部材側抑制部材対向部40bに着脱部材側凹部48を形成し、逸脱抑制部材側凸部46を着脱部材側凹部48に嵌合させることにより、逸脱抑制部材42を潤滑剤供給体着脱部材40へ取り付けたが、これに限定するものではない。すなわち、例えば、逸脱抑制部材42を潤滑剤供給体着脱部材40の中空部内に配置した状態で、逸脱抑制部材42及び潤滑剤供給体着脱部材40をナット8の径方向へ貫通するボルト等を用いて、逸脱抑制部材42を潤滑剤供給体着脱部材40へ取り付けてもよい。 (6) In the ball screw 1 of the present embodiment, the departure suppressing member side convex portion 46 is formed in the departure suppressing member facing portion 42a, and the attaching / detaching member side recessed portion 48 is formed in the attaching / detaching member side suppressing member facing portion 40b. Although the deviation suppressing member 42 is attached to the lubricant supply member attaching / detaching member 40 by fitting the suppressing member side protruding portion 46 to the attaching / detaching member side recessed portion 48, the invention is not limited to this. That is, for example, a bolt or the like that penetrates the departure suppressing member 42 and the lubricant supply body attaching / detaching member 40 in the radial direction of the nut 8 in a state where the departure suppressing member 42 is disposed in the hollow portion of the lubricant supplying body attaching / detaching member 40 is used. Thus, the deviation suppressing member 42 may be attached to the lubricant supply body attaching / detaching member 40.

(7)本実施形態のボールねじ1では、逸脱抑制部材42の構成を、逸脱抑制部材側弾性変形部56を備える構成としたが、これに限定するものではなく、逸脱抑制部材42の構成を、逸脱抑制部材側弾性変形部56を備えていない構成としてもよい。この場合、逸脱抑制部材42を潤滑剤供給体着脱部材40へ取り付ける際には、例えば、逸脱抑制部材42全体を湾曲させて、逸脱抑制部材側凸部46を着脱部材側凹部48に嵌合させる。
(8)本実施形態のボールねじ1では、樹脂材料を用いて形成した逸脱抑制部材42の、ねじ軸4と対向する部分に、ねじ軸側軌道溝16と接触する逸脱抑制部材側シール部を形成したが、これに限定するものではない。すなわち、逸脱抑制部材42のねじ軸4と対向する部分に、上記逸脱抑制部材側シール部を形成しない構成としてもよい。
(7) In the ball screw 1 of the present embodiment, the configuration of the departure suppressing member 42 is configured to include the departure suppressing member side elastic deformation portion 56, but is not limited thereto, and the configuration of the departure suppressing member 42 is not limited thereto. The deviation suppressing member-side elastic deformation portion 56 may not be provided. In this case, when attaching the deviation suppressing member 42 to the lubricant supplier attaching / detaching member 40, for example, the deviation suppressing member 42 is entirely bent and the deviation suppressing member side convex portion 46 is fitted to the attaching / detaching member side concave portion 48. .
(8) In the ball screw 1 of the present embodiment, the deviation suppressing member side seal portion that comes into contact with the screw shaft side raceway groove 16 is provided on the portion of the deviation suppressing member 42 formed using a resin material, facing the screw shaft 4. Although formed, it is not limited to this. That is, it is good also as a structure which does not form the said deviation suppression member side seal part in the part facing the screw shaft 4 of the deviation suppression member 42. FIG.

1 ボールねじ
2 ボールねじ装置
4 ねじ軸
6 機台
8 ナット
10 ボール
12 ボール循環部品
14 循環部品固定部材
16 ねじ軸側軌道溝
18 ナット側軌道溝
20 ボール戻り路
22 固定部材側凸部
24 ナット側凹部
26 負荷転動路
28 ボール誘導路
30 固定部材側ねじ軸挿通孔
32 固定部材側弾性変形部
34 循環部品固定部材側シール部
36 循環部品嵌合部
38 潤滑剤供給体
40 潤滑剤供給体着脱部材
42 逸脱抑制部材
44 着脱部材側凸部
46 逸脱抑制部材側凸部
48 着脱部材側凹部
50 着脱部材側ねじ軸挿通孔
52 着脱部材側弾性変形部
54 逸脱抑制部材側ねじ軸挿通孔
56 逸脱抑制部材側弾性変形部
CLS ねじ軸の中心軸線
Wmin ねじ軸の軸方向から見たナットの最小幅
Lmax 循環部品固定部材の、固定部材側凸部と固定部材側弾性変形部との間の部分のうち、ねじ軸の軸方向から見てボール循環部品と重なる部分の、ナットの径方向に沿った最大長さ
DESCRIPTION OF SYMBOLS 1 Ball screw 2 Ball screw apparatus 4 Screw shaft 6 Machine base 8 Nut 10 Ball 12 Ball circulating component 14 Circulating component fixing member 16 Screw shaft side raceway groove 18 Nut side raceway groove 20 Ball return path 22 Fixed member side convex part 24 Nut side Concave part 26 Load rolling path 28 Ball guide path 30 Fixed member side screw shaft insertion hole 32 Fixed member side elastic deformation part 34 Circulating part fixing member side seal part 36 Circulating part fitting part 38 Lubricant supply body 40 Lubricant supply body attachment / detachment Member 42 Deviation suppression member 44 Detachment member side convex portion 46 Deviation suppression member side convex portion 48 Detachment member side concave portion 50 Detachment member side screw shaft insertion hole 52 Detachment member side elastic deformation portion 54 Deviation suppression member side screw shaft insertion hole 56 Deviation suppression Member side elastic deformation part CLS Center axis line of screw shaft Wmin Minimum width of nut viewed from axial direction of screw shaft Lmax Circulating component fixing member Of the portion between the stationary member side protrusion and the fixed member side elastic deformation portion, the portion viewed from the axial direction of the screw shaft overlaps with the ball circulating member, the maximum length along the radial direction of the nut

Claims (14)

螺旋状のねじ軸側軌道溝を外周面に有するねじ軸と、前記ねじ軸側軌道溝に対向するナット側軌道溝が内周面に形成され、且つボール戻り路が内部に形成されたナットと、前記両軌道溝間に形成される負荷転動路内に転動自在に装填され、且つ前記ねじ軸または前記ナットの回転運動に伴って前記負荷転動路内を転動する複数のボールと、前記ナットの端部に配置され、且つ前記負荷転動路と前記ボール戻り路とを連通するボール誘導路を有するボール循環部品と、を備えたボールねじであって、
前記ボール循環部品は、前記ねじ軸の軸方向から見て前記ナットの端部の一部のみと重なり、
前記ボール循環部品を間に挟んで前記ナットの端部に取り付けられて、前記ボール循環部品を前記ナットの端部に固定する板状の循環部品固定部材を備え、
前記循環部品固定部材は、前記ねじ軸の軸方向から見て、前記ボール循環部品の少なくとも一部と重なる固定部材側循環部品押え部と、当該固定部材側循環部品押え部から突出するとともに前記ナットの端部の一部と重なる固定部材側循環部品固定部と、を備え、
前記ナットは、前記ねじ軸の軸方向から見て、前記循環部品固定部材及び前記ナット側軌道溝と重なる部分以外の少なくとも一部が、前記循環部品固定部材と重なる部分よりも、前記ねじ軸の中心からの距離が短いことを特徴とするボールねじ。
A screw shaft having a spiral screw shaft side raceway groove on the outer peripheral surface, a nut having a nut side raceway groove opposed to the screw shaft side raceway groove formed on the inner peripheral surface, and a ball return path formed therein; A plurality of balls which are slidably loaded in a load rolling path formed between the both raceway grooves and roll in the load rolling path in accordance with the rotational movement of the screw shaft or the nut; A ball circulating part disposed at an end of the nut and having a ball guiding path that communicates the load rolling path and the ball return path,
The ball circulation component overlaps only a part of the end of the nut as viewed from the axial direction of the screw shaft,
A plate-like circulation component fixing member that is attached to the end of the nut with the ball circulation component in between, and fixes the ball circulation component to the end of the nut;
The circulating component fixing member, as viewed from the axial direction of the screw shaft, protrudes from the fixing member-side circulating component pressing portion that overlaps at least a part of the ball circulating component, and protrudes from the fixing member-side circulating component pressing portion and the nut A fixed member-side circulating component fixing part that overlaps a part of the end of
When viewed from the axial direction of the screw shaft, the nut has at least a portion other than the portion overlapping the circulating component fixing member and the nut side raceway groove than the portion overlapping the circulating component fixing member. A ball screw characterized by a short distance from the center.
前記循環部品固定部材は、前記ナットとナットの径方向で対向する固定部材側対向部を備え、
前記ナットは、前記循環部品固定部材と前記ナットの径方向で対向するナット側対向部を備え、
前記固定部材側対向部に、前記ねじ軸の軸方向から見て前記ナット側へ突出する固定部材側凸部を形成し、
前記ナット側対向部に、前記固定部材側凸部が嵌合するナット側凹部を形成したことを特徴とする請求項1に記載したボールねじ。
The circulating component fixing member includes a fixing member side facing portion facing the nut and the radial direction of the nut,
The nut includes a nut-side facing portion that faces the circulating component fixing member in the radial direction of the nut,
A fixing member side convex portion that protrudes toward the nut side when viewed from the axial direction of the screw shaft is formed on the fixing member side facing portion,
2. The ball screw according to claim 1, wherein a nut-side concave portion into which the fixing member-side convex portion is fitted is formed in the nut-side facing portion.
前記循環部品固定部材は、前記固定部材側対向部の少なくとも一部を弾性変形させて前記固定部材側凸部を前記ナットの径方向に前記ねじ軸側へ変位可能な固定部材側弾性変形部を備えることを特徴とする請求項2に記載したボールねじ。   The circulating component fixing member includes a fixing member-side elastic deformation portion capable of elastically deforming at least a part of the fixing member-side facing portion and displacing the fixing member-side convex portion toward the screw shaft in the radial direction of the nut. The ball screw according to claim 2, wherein the ball screw is provided. 前記固定部材側弾性変形部を、前記循環部品固定部材のうち前記ねじ軸の軸方向から見て前記ボール循環部品と重なる部分の一部を貫通する開口部とし、
前記循環部品固定部材の前記固定部材側凸部と前記固定部材側弾性変形部との間の部分のうち、前記ねじ軸の軸方向から見て前記ボール循環部品と重なる部分の前記ナットの径方向に沿った最大長さを、0.5mm以上としたことを特徴とする請求項3に記載したボールねじ。
The fixing member side elastic deformation portion is an opening that penetrates a part of the circulating component fixing member that overlaps the ball circulating component when viewed from the axial direction of the screw shaft,
The radial direction of the nut of the portion of the circulating component fixing member that overlaps the ball circulating component when viewed from the axial direction of the screw shaft, of the portion between the fixing member side convex portion and the fixing member side elastic deformation portion The ball screw according to claim 3, wherein the maximum length along the axis is 0.5 mm or more.
前記循環部品固定部材を、樹脂材料を用いて形成し、
前記循環部品固定部材の前記ねじ軸と対向する部分の少なくとも一部に、前記ねじ軸側軌道溝と接触する循環部品固定部材側シール部を形成したことを特徴とする請求項1から4のうちいずれか1項に記載したボールねじ。
The circulating component fixing member is formed using a resin material,
5. The circulating part fixing member side seal portion that contacts the screw shaft side raceway groove is formed on at least a part of a portion of the circulating part fixing member that faces the screw shaft. The ball screw described in any one of the items.
螺旋状のねじ軸側軌道溝を外周面に有するねじ軸と、前記ねじ軸側軌道溝に対向するナット側軌道溝が内周面に形成され、且つボール戻り路が内部に形成されたナットと、前記両軌道溝間に形成される負荷転動路内に転動自在に装填され、且つ前記ねじ軸または前記ナットの回転運動に伴って前記負荷転動路内を転動する複数のボールと、前記ナットの端部に配置され、且つ前記負荷転動路と前記ボール戻り路とを連通するボール誘導路を有するボール循環部品と、潤滑剤を含有し、且つ含有した潤滑剤を前記ねじ軸の外周面へ供給する円環状の潤滑剤供給体と、当該潤滑剤供給体を収容して前記ナットの端部側へ着脱可能に取り付ける略円筒状の潤滑剤供給体着脱部材と、を備えたボールねじであって、
前記ボール循環部品は、前記ねじ軸の軸方向から見て前記ナットの端部の一部のみと重なり、
前記潤滑剤供給体着脱部材を前記ナットの端部へ前記ボール循環部品を間に挟んで取り付けて、前記ボール循環部品を前記ナットの端部に固定し、
前記潤滑剤供給体着脱部材は、前記ねじ軸の軸方向から見て、前記ボール循環部品の少なくとも一部と重なる着脱部材側循環部品押え部と、当該着脱部材側循環部品押え部から突出するとともに前記ナットの端部の一部と重なる着脱部材側循環部品固定部と、を備え、
前記ナットは、前記ねじ軸の軸方向から見て、前記潤滑剤供給体着脱部材及び前記ナット側軌道溝と重なる部分以外の少なくとも一部が、前記潤滑剤供給体着脱部材と重なる部分よりも、前記ねじ軸の中心からの距離が短いことを特徴とするボールねじ。
A screw shaft having a spiral screw shaft side raceway groove on the outer peripheral surface, a nut having a nut side raceway groove opposed to the screw shaft side raceway groove formed on the inner peripheral surface, and a ball return path formed therein; A plurality of balls which are slidably loaded in a load rolling path formed between the both raceway grooves and roll in the load rolling path in accordance with the rotational movement of the screw shaft or the nut; A ball circulation part disposed at an end of the nut and having a ball guide path communicating the load rolling path and the ball return path; and a lubricant, and the lubricant contained in the screw shaft An annular lubricant supplier that is supplied to the outer peripheral surface of the outer peripheral surface, and a substantially cylindrical lubricant supplier attaching / detaching member that accommodates the lubricant supplier and is detachably attached to the end of the nut. A ball screw,
The ball circulation component overlaps only a part of the end of the nut as viewed from the axial direction of the screw shaft,
The lubricant supply body attaching / detaching member is attached to the end portion of the nut with the ball circulation component interposed therebetween, and the ball circulation component is fixed to the end portion of the nut,
The lubricant supply body attaching / detaching member protrudes from the attaching / detaching member-side circulating component pressing portion that overlaps at least a part of the ball circulating component and the attaching / detaching member-side circulating component pressing portion as viewed from the axial direction of the screw shaft. A detachable member side circulating component fixing portion that overlaps a part of the end of the nut, and
When viewed from the axial direction of the screw shaft, the nut has at least a portion other than the portion overlapping the lubricant supply body attaching / detaching member and the nut side raceway groove than the portion overlapping the lubricant supply body attaching / detaching member, A ball screw having a short distance from the center of the screw shaft.
前記潤滑剤供給体着脱部材は、前記ナットとナットの径方向で対向する着脱部材側ナット対向部を備え、
前記ナットは、前記潤滑剤供給体着脱部材と前記ナットの径方向で対向するナット側対向部を備え、
前記着脱部材側ナット対向部に、前記ねじ軸の軸方向から見て前記ナット側へ突出する着脱部材側凸部を形成し、
前記ナット側対向部に、前記着脱部材側凸部が嵌合するナット側凹部を形成したことを特徴とする請求項6に記載したボールねじ。
The lubricant supply body attaching / detaching member includes an attaching / detaching member side nut facing portion facing the nut in a radial direction of the nut,
The nut includes a nut-side facing portion that faces the lubricant supply body attaching / detaching member in the radial direction of the nut,
A detachable member side convex portion that protrudes toward the nut side when viewed from the axial direction of the screw shaft is formed on the detachable member side nut facing portion,
The ball screw according to claim 6, wherein a nut-side concave portion into which the detachable member-side convex portion is fitted is formed in the nut-side facing portion.
前記潤滑剤供給体着脱部材は、前記着脱部材側ナット対向部の少なくとも一部を弾性変形させて前記着脱部材側凸部を前記ナットの径方向に前記ねじ軸側へ変位可能な着脱部材側弾性変形部を備えることを特徴とする請求項7に記載したボールねじ。   The lubricant supply body attaching / detaching member is elastic on an attaching / detaching member side that is capable of elastically deforming at least part of the attaching / detaching member side nut facing portion and displacing the attaching / detaching member side convex portion toward the screw shaft side in a radial direction of the nut. The ball screw according to claim 7, further comprising a deformation portion. 前記着脱部材側弾性変形部を、前記循環部品固定部材のうち前記ねじ軸の軸方向から見て前記ボール循環部品と重なる部分の一部を貫通する開口部とし、
前記潤滑剤供給体着脱部材の前記着脱部材側凸部と前記着脱部材側弾性変形部との間の部分のうち、前記ねじ軸の軸方向から見て前記ボール循環部品と重なる部分の前記ナットの径方向に沿った最大長さを、0.5mm以上としたことを特徴とする請求項8に記載したボールねじ。
The detachable member side elastic deformation portion is an opening that penetrates a part of the circulating component fixing member that overlaps the ball circulating component when viewed from the axial direction of the screw shaft,
Of the portion of the lubricant supply body attaching / detaching member between the attaching / detaching member side convex portion and the attaching / detaching member side elastic deformation portion, the nut of the portion that overlaps with the ball circulation component when viewed from the axial direction of the screw shaft 9. The ball screw according to claim 8, wherein the maximum length along the radial direction is 0.5 mm or more.
前記潤滑剤供給体着脱部材に収容した前記潤滑剤供給体の逸脱を抑制する板状の逸脱抑制部材を備え、
前記逸脱抑制部材の形状を、前記ねじ軸の軸方向から見て前記逸脱抑制部材全体が前記潤滑剤供給体着脱部材と重なる形状としたことを特徴とする請求項6から9のうちいずれか1項に記載したボールねじ。
A plate-shaped deviation suppressing member that suppresses deviation of the lubricant supplying body housed in the lubricant supplying / detaching member;
The shape of the deviation suppressing member is a shape in which the entire deviation suppressing member overlaps with the lubricant supply member attaching / detaching member when viewed from the axial direction of the screw shaft. Ball screw described in the item.
前記逸脱抑制部材は、前記潤滑剤供給体着脱部材と前記ナットの径方向で対向する逸脱抑制部材側対向部を備え、
前記潤滑剤供給体着脱部材は、前記逸脱抑制部材と前記ナットの径方向で対向する着脱部材側対向部を備え、
前記逸脱抑制部材側対向部に、前記ねじ軸の軸方向から見て前記潤滑剤供給体着脱部材側へ突出する逸脱抑制部材側凸部を形成し、
前記着脱部材側対向部に、前記逸脱抑制部材側凸部が嵌合する着脱部材側凹部を形成したことを特徴とする請求項10に記載したボールねじ。
The departure suppressing member includes a departure suppressing member side facing portion that faces the lubricant supply body attaching / detaching member in the radial direction of the nut,
The lubricant supply body attaching / detaching member includes an attaching / detaching member side facing portion facing the deviation suppressing member in a radial direction of the nut,
A deviation suppressing member-side convex portion that protrudes toward the lubricant supply body attaching / detaching member side when viewed from the axial direction of the screw shaft is formed on the deviation suppressing member-side facing portion,
The ball screw according to claim 10, wherein a detachable member side concave portion into which the deviation suppressing member side convex portion is fitted is formed in the detachable member side facing portion.
前記逸脱抑制部材は、前記逸脱抑制部材側対向部の少なくとも一部を弾性変形させて前記逸脱抑制部材側凸部を前記ナットの径方向に前記ねじ軸側へ変位可能な逸脱抑制部材側弾性変形部を備えることを特徴とする請求項11に記載したボールねじ。   The departure restraining member elastically deforms at least a part of the departure restraining member side facing portion, and is capable of displacing the departure restraining member side convex portion toward the screw shaft in the radial direction of the nut. The ball screw according to claim 11, further comprising a portion. 前記逸脱抑制部材を、樹脂材料を用いて形成し、
前記逸脱抑制部材の前記ねじ軸と対向する部分の少なくとも一部に、前記ねじ軸側軌道溝と接触する逸脱抑制部材側シール部を形成したことを特徴とする請求項10から12のうちいずれか1項に記載したボールねじ。
The deviation suppressing member is formed using a resin material,
The deviation suppressing member side seal portion that contacts the screw shaft side raceway groove is formed in at least a part of a portion of the deviation suppressing member facing the screw shaft. The ball screw described in item 1.
請求項1から13のうちいずれか1項に記載した複数のボールねじを備え、
前記複数のボールねじを、互いに前記ねじ軸の軸方向を平行とし、且つ前記ねじ軸の軸方向から見て前記ナットの最小幅の部分同士を対向させて配列したことを特徴とするボールねじ装置。
A plurality of ball screws according to any one of claims 1 to 13, comprising:
The ball screw device, wherein the plurality of ball screws are arranged such that the axial directions of the screw shafts are parallel to each other, and the minimum width portions of the nuts are opposed to each other when viewed from the axial direction of the screw shafts .
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