JP2003021217A - Ball screw - Google Patents
Ball screwInfo
- Publication number
- JP2003021217A JP2003021217A JP2001204287A JP2001204287A JP2003021217A JP 2003021217 A JP2003021217 A JP 2003021217A JP 2001204287 A JP2001204287 A JP 2001204287A JP 2001204287 A JP2001204287 A JP 2001204287A JP 2003021217 A JP2003021217 A JP 2003021217A
- Authority
- JP
- Japan
- Prior art keywords
- ball screw
- screw shaft
- ball
- groove
- nut
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、ねじ軸に循環用
の部材を設けたボールねじに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball screw having a screw shaft provided with a circulating member.
【０００２】[0002]
【従来の技術】ボールねじにおいて、ボールの循環用の
部材はナットに設けられる。循環方式としては、リター
ンチューブ式、エンドキャップ式、駒式、ガイドプレー
ト式がある。ナット外径をコンパクトに設計するのに、
最も有利な循環方式は駒式であり、外径を小さく設計す
るような用途では駒式を採用する場合が多い。2. Description of the Related Art In a ball screw, a member for circulating a ball is provided on a nut. As the circulation method, there are a return tube type, an end cap type, a bridge type, and a guide plate type. To design the nut outer diameter compactly,
The most advantageous circulation method is the bridge type, and the bridge type is often used in applications where the outer diameter is designed to be small.
【０００３】図４は、従来の駒式ボールねじを示す。ボ
ールねじ軸５１とナット５３とは、各々に設けられた外
ねじ溝５２と内ねじ溝５４間のボール５５を介して螺合
している。ナット５３の円筒胴部には、内外の周面に貫
通して嵌合孔５６が穿設され、この嵌合孔５６に、駒部
材５７が嵌合している。駒部材５７は、内ねじ溝５４の
隣合う１周部分同士を連結する連結溝５８を形成した部
品であり、内ねじ溝５４の略１周の部分と連結溝５８と
で、ボール５５の周回路が構成される。周回路内の内外
のねじ溝５２，５４間に介在した多数のボール５５は、
ねじ溝５２，５４に沿って転動して、駒部材５７の連結
溝５８に案内され、ボールねじ軸５１のねじ山を乗り越
えて隣接する内ねじ溝５４に戻り循環可能とされてい
る。FIG. 4 shows a conventional piece type ball screw. The ball screw shaft 51 and the nut 53 are screwed together via a ball 55 between an outer screw groove 52 and an inner screw groove 54 provided in each. A fitting hole 56 is formed in the cylindrical body of the nut 53 so as to penetrate through the inner and outer peripheral surfaces thereof, and a piece member 57 is fitted in the fitting hole 56. The piece member 57 is a component in which a connecting groove 58 is formed to connect adjacent one-circumferential portions of the inner screw groove 54, and the portion of the inner screw groove 54 substantially one lap and the connecting groove 58 form the circumference of the ball 55. The circuit is constructed. A large number of balls 55 interposed between the inner and outer screw grooves 52 and 54 in the peripheral circuit are
It rolls along the screw grooves 52 and 54, is guided by the connecting groove 58 of the piece member 57, goes over the thread of the ball screw shaft 51, and returns to the adjacent inner screw groove 54 to be circulated.
【０００４】[0004]
【発明が解決しようとする課題】ボールねじは、通常、
ナットに循環部材を設けるため、ナットの外径が大きく
なり、コンパクト化ができないという問題がある。コン
パクト化のためには、上記のように循環方式として、リ
ターンチューブ式やガイドプレート式等よりも駒式の方
が有利であり、通常は駒式が採用される。しかし、駒式
においても、図４に示すように、ナット５３には駒部材
５７を装着するための窓５６が必要であり、コンパクト
化にも限界がある。Ball screws are usually
Since the nut is provided with the circulation member, there is a problem that the outer diameter of the nut becomes large and the nut cannot be made compact. In order to make the device compact, the piece type is more advantageous than the return tube type or the guide plate type as the circulation method as described above, and the piece type is usually used. However, in the piece type as well, as shown in FIG. 4, the nut 53 requires the window 56 for mounting the piece member 57, and there is a limit to downsizing.
【０００５】また、駒式に限らず、駒部材５７等の循環
部材を持ったボールねじにおいて、駒部材５７等の循環
部材のある位置には、負荷を受けるボールが存在しな
い。ボールねじの取付時に、モーメント荷重やラジアル
荷重の加わる方向が予め判っている場合は、駒部材５７
等の循環部材を負荷の少ない位置に配置するのが有利と
なる。しかし、ナット回転方式で使用される場合、駒部
材５７等の循環部材をナットに配置していると、循環部
材も回転するため、負荷の少ない位置に循環部材を配置
するような設計は採れない。Further, the ball screw having a circulation member such as the piece member 57 is not limited to the piece type, and there is no ball to be loaded at a position where the circulation member such as the piece member 57 exists. If the direction in which the moment load or radial load is applied is known in advance when mounting the ball screw, the bridge member 57
It is advantageous to arrange the circulation members such as the above in positions where the load is small. However, in the case of using the nut rotation method, if the circulation member such as the piece member 57 is arranged in the nut, the circulation member also rotates, so that the design in which the circulation member is arranged at the position where the load is small cannot be adopted. .
【０００６】この発明の目的は、コンパクト化が可能
で、ボールを循環させるための循環部材を負荷の少ない
位置に容易に配置できるボールねじを提供することを目
的とする。An object of the present invention is to provide a ball screw which can be made compact and in which a circulating member for circulating a ball can be easily arranged at a position where a load is small.
【０００７】[0007]
【課題を解決するための手段】この発明のボールねじ
は、いずれもボールねじ軸側にボール循環用の手段を設
けたものである。この発明の第１の発明のボールねじ
は、回転不可で、かつ軸方向移動可能なボールねじ軸
と、このボールねじ軸に対向して内周に内ねじ溝を有
し、回転可能で、かつ軸方向移動不可なナットと、上記
ボールねじ軸と内ねじ溝との間に形成された転動路に連
なって配置され、上記ナットとボールねじ軸の間で力を
伝達するための複数のボールとを備え、ねじ溝同士を連
結し、上記ボールが循環する連結溝を上記ボールねじ軸
に形成すると共に、ボールを元のねじ溝に戻すための遮
蔽部材を装着したものである。この構成によると、ボー
ルねじ軸にボール循環用の連結溝を形成し、遮蔽部材を
装着したため、ナットにボールを循環させるための循環
部材を配置する必要がなく、それだけナットの外径を小
さくでき、ボールねじをコンパクトに構成できる。ま
た、循環部材である遮蔽部材を回転不可のボールねじ軸
側に設置するので、ボールねじの取付時にモーメント荷
重やラジアル荷重の加わる方向が予め分かっている場合
に、前記遮蔽部材を負荷の少ない位置に片寄せて配置す
るように容易に設計することができ、ボールねじの長寿
命化が可能となる。All the ball screws according to the present invention are provided with a ball circulating means on the ball screw shaft side. A ball screw according to a first invention of the present invention has a non-rotatable and axially movable ball screw shaft, and an inner screw groove in an inner periphery facing the ball screw shaft, and is rotatable, and A plurality of balls for transmitting force between the nut and the ball screw shaft, which are arranged in series with a nut that cannot move in the axial direction and a rolling path formed between the ball screw shaft and the inner screw groove. And connecting the screw grooves to each other, forming a connecting groove through which the ball circulates on the ball screw shaft, and mounting a shielding member for returning the ball to the original screw groove. According to this structure, since the ball groove connecting groove is formed on the ball screw shaft and the shielding member is mounted, it is not necessary to dispose a circulating member for circulating the ball in the nut, and the outer diameter of the nut can be reduced accordingly. The ball screw can be made compact. In addition, since the shielding member, which is a circulation member, is installed on the non-rotatable ball screw shaft side, when the direction in which the moment load or radial load is applied is known in advance when mounting the ball screw, the shielding member is placed at a position where the load is small. The ball screw can be easily designed so that the ball screws can be placed closer to each other, and the life of the ball screw can be extended.
【０００８】この発明において、上記遮蔽部材が、ねじ
溝と同じリードを有する螺旋状の線材からなり、この線
材を上記ねじ軸のねじ溝に嵌合しても良い。このように
遮蔽部材を螺旋状の線材とした場合、構成が簡単で、ま
た遮蔽部材をねじ溝に嵌め込むことによりボールねじ軸
へ容易に装着することができる。In the present invention, the shielding member may be made of a spiral wire rod having the same lead as the screw groove, and the wire rod may be fitted in the screw groove of the screw shaft. In this way, when the shield member is a spiral wire rod, the structure is simple, and the shield member can be easily mounted on the ball screw shaft by fitting it into the thread groove.
【０００９】この発明の第２の発明のボールねじは、回
転不可で、かつ軸方向移動可能なボールねじ軸と、この
ボールねじ軸に対向して内周に内ねじ溝を有し、回転可
能で、かつ軸方向移動不可なナットと、上記ボールねじ
軸と内ねじ溝との間に形成された転動路に連なって配置
され、上記ナットとボールねじ軸の間で力を伝達するた
めの複数のボールとを備え、ねじ溝同士を連結し、上記
ボールが循環する連結溝を有する駒部材を上記ボールね
じ軸に装着したものである。この構成の場合、ボール循
環用の連結溝を有する駒部材をボールねじ軸に装着した
ため、ナットにボールを循環用の部材を配置する必要が
なく、それだけナットの外径を小さくでき、ボールねじ
をコンパクトに構成できる。また、循環部材である駒部
材を回転不可のボールねじ軸側に設置するので、ボール
ねじの取付時にモーメント荷重やラジアル荷重の加わる
方向が予め分かっている場合には、前記駒部材を負荷の
少ない位置に片寄せて配置するように容易に設計するこ
とができ、ボールねじの長寿命化が可能となる。The ball screw according to the second aspect of the present invention has a non-rotatable, axially movable ball screw shaft and an inner thread groove on the inner circumference facing the ball screw shaft and is rotatable. And a nut which is immovable in the axial direction and a rolling path formed between the ball screw shaft and the inner screw groove, are arranged in series to transmit a force between the nut and the ball screw shaft. A plurality of balls are provided, the thread grooves are connected to each other, and a piece member having a connection groove for circulating the balls is mounted on the ball screw shaft. In the case of this configuration, since the piece member having the connecting groove for ball circulation is mounted on the ball screw shaft, it is not necessary to arrange the member for circulating the ball in the nut, and the outer diameter of the nut can be reduced accordingly, and the ball screw It can be made compact. Further, since the piece member which is the circulation member is installed on the non-rotatable ball screw shaft side, when the direction in which the moment load or the radial load is applied when the ball screw is attached is known in advance, the piece member is less loaded. The ball screw can be easily designed so as to be shifted to one position, and the life of the ball screw can be extended.
【００１０】この発明において、上記ねじ溝に嵌合する
係止部を上記駒部材に一体形成しても良い。このように
係止部を設けることにより、位置精度良く駒部材をボー
ルねじ軸に装着できる。In the present invention, the engaging portion that fits into the thread groove may be integrally formed with the piece member. By providing the locking portion in this manner, the piece member can be mounted on the ball screw shaft with high positional accuracy.
【００１１】また、この発明において、上記ボールねじ
軸を中空とし、このボールねじ軸に内径側から上記駒部
材を装着すると共に、この駒部材を塑性変形により上記
ボールねじ軸に固定しても良い。このように内径側から
駒部材を装着する構成とした場合、駒部材の取付けや位
置決めが簡単になる。In the present invention, the ball screw shaft may be hollow, the piece member may be mounted on the ball screw shaft from the inner diameter side, and the piece member may be fixed to the ball screw shaft by plastic deformation. . When the piece member is mounted from the inner diameter side in this way, the piece member can be easily attached and positioned.
【００１２】なお、この発明の第１および第２の発明に
おいて、ボールねじ軸を回転不可，軸方向移動可能とし
た構成に変えて、ボールねじ軸を回転可能，軸方向移動
不可とし、かつナットを回転可能，軸方向移動不可とし
た構成に変えて、ナットを回転不可，軸方向移動不可と
しても良い。この構成の場合、荷重の加わる方向や位置
に応じて循環用の部材を配置することはできないが、コ
ンパクト化や、その他の効果は上記各構成の場合と同様
に得られる。In the first and second aspects of the present invention, the ball screw shaft is made non-rotatable and axially movable, so that the ball screw shaft is rotatable and axially immovable and the nut is nut. The nut may be non-rotatable or axially immovable, instead of being rotatable or axially immovable. In the case of this configuration, it is not possible to arrange the members for circulation in accordance with the direction and position of the load, but downsizing and other effects can be obtained as in the case of each of the above configurations.
【００１３】[0013]
【発明の実施の形態】この発明の一実施形態を図１と共
に説明する。このボールねじ２０は、ボールねじ軸２１
と、ナット２２と、複数のボール２３とを備える。ボー
ルねじ軸２１は外周面に外ねじ溝２４を有し、ナット２
２は外ねじ溝２４に対向する内ねじ溝２５を有する。ボ
ール２３は、ボールねじ軸２１の外ねじ溝２４とナット
２２の内ねじ溝２５との間に形成された転動路２６に連
なって配置され、ナット２２とボールねじ軸２１の間で
力を伝達する。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIG. The ball screw 20 has a ball screw shaft 21.
A nut 22, and a plurality of balls 23. The ball screw shaft 21 has an outer thread groove 24 on the outer peripheral surface, and the nut 2
2 has an inner thread groove 25 facing the outer thread groove 24. The ball 23 is arranged in series with a rolling path 26 formed between an outer thread groove 24 of the ball screw shaft 21 and an inner thread groove 25 of the nut 22 to generate a force between the nut 22 and the ball screw shaft 21. introduce.
【００１４】ボールねじ軸２１には、軸方向の１箇所ま
たは複数箇所に、外ねじ溝２４の隣合う１周部分同士を
連結する連結溝２７が形成される。この連結溝２７で連
結される隣合う外ねじ溝２４の一部には、外ねじ溝２４
と同じリードを有する螺旋状の線材からなる遮蔽部材２
８が装着される。遮蔽部材２８は、その端面２８ａが連
結溝２７の内面に続くように案内面として設けられ、外
ねじ溝２４の隣合う１周部分同士のうち、一方の１周部
分に移動したボール２３を連結溝２７へ案内して元の１
周部分に戻す部材である。連結溝２７の深さは、ボール
２３が、連結溝２７内でナット２２の内ねじ溝２５のね
じ山を越えることができる深さとされている。このよう
に構成されることで、ボールねじ軸２１の外ねじ溝２４
と連結溝２７とで、１周の連続した周回経路が形成さ
れ、その周回経路をボール２３が循環可能となる。ここ
では、連結溝２７が軸方向に並べて複数箇所設けられ、
これにより外ねじ溝２４は、複数条並んだ周回経路に分
割される。なお、ここでは、ボールねじ軸２１として中
空軸を用いているが、これに限らず中実軸を用いても良
い。このボールねじ２０の使用形態として、ボールねじ
軸２１は回転不可で、かつ軸方向に移動可能なように設
置され、ナット２２は回転可能で、かつ軸方向に移動不
可なように設置される。The ball screw shaft 21 is formed with a connecting groove 27 for connecting adjacent one circumferential portions of the outer screw groove 24 at one or a plurality of positions in the axial direction. The external thread groove 24 is provided in a part of the adjacent external thread groove 24 connected by the connection groove 27.
Shield member 2 made of a spiral wire having the same lead as
8 is attached. The shielding member 28 is provided as a guide surface so that its end surface 28a continues to the inner surface of the connecting groove 27, and connects the ball 23 that has moved to one of the adjacent one peripheral portions of the outer thread groove 24. Guidance to groove 27, original 1
It is a member that returns to the peripheral portion. The depth of the connection groove 27 is set so that the ball 23 can pass over the thread of the inner thread groove 25 of the nut 22 in the connection groove 27. With this configuration, the outer screw groove 24 of the ball screw shaft 21
The connecting groove 27 forms a continuous circular path, and the ball 23 can circulate in the circular path. Here, the connection grooves 27 are arranged in a plurality of positions in the axial direction,
As a result, the outer thread groove 24 is divided into a plurality of circumferentially arranged circumferential paths. In addition, although the hollow shaft is used as the ball screw shaft 21 here, it is not limited to this and a solid shaft may be used. As a usage pattern of this ball screw 20, a ball screw shaft 21 is installed so as not to be rotatable and movable in the axial direction, and a nut 22 is installed so as to be rotatable but not movable in the axial direction.
【００１５】この構成のボールねじ２０によると、ボー
ルねじ軸２１に連結溝２７を形成すると共に遮蔽部材２
８を装着して、ボール２３を循環させる１周の連続した
周回経路を構成したため、ナット２２に周回経路を構成
するための循環部材を配置する必要がない。そのため、
ナット２２の外径を小さくでき、ボールねじ２０をコン
パクトに構成できる。また、前記周回経路を構成する循
環部材である遮蔽部材２８を回転しないボールねじ軸２
１側に設置するので、ボールねじ２０の取付時にモーメ
ント荷重やラジアル荷重の加わる方向が予め分かってい
る場合には、前記遮蔽部材２８を負荷の少ない位置に片
寄せて配置するように容易に設計することができ、これ
によりボールねじ２０の長寿命化が可能になる。また、
この実施形態では、遮蔽部材２８が、ボールねじ軸２１
の外ねじ溝２４と同じリードを有する螺旋状の線材から
なるので、外ねじ溝２４に嵌合させることによりボール
ねじ軸２１へ容易に遮蔽部材２８を装着することができ
る。遮蔽部材２８としては、このほかブロック状のもの
を用いてボールねじ軸２１に接着等で固定して、外ねじ
溝２４の一部を塞ぐようにしても良い。According to the ball screw 20 having this structure, the ball screw shaft 21 is formed with the connecting groove 27 and the shielding member 2 is formed.
Since 8 is mounted to form a continuous circulation path for circulating the ball 23, it is not necessary to dispose a circulation member for forming the circulation path on the nut 22. for that reason,
The outer diameter of the nut 22 can be reduced, and the ball screw 20 can be made compact. Further, the ball screw shaft 2 that does not rotate the shielding member 28 that is the circulation member that constitutes the circulating path.
Since it is installed on the first side, when the direction in which a moment load or a radial load is applied when the ball screw 20 is attached is known in advance, the shielding member 28 is easily designed so as to be offset to a position where the load is small. Therefore, the life of the ball screw 20 can be extended. Also,
In this embodiment, the shielding member 28 is the ball screw shaft 21.
Since it is made of a spiral wire having the same lead as that of the outer screw groove 24, the shielding member 28 can be easily attached to the ball screw shaft 21 by fitting it into the outer screw groove 24. In addition, as the shielding member 28, a block-shaped member may be used and fixed to the ball screw shaft 21 by adhesion or the like so as to close a part of the outer screw groove 24.
【００１６】図２は、この発明の第２の実施形態にかか
るボールねじを示す。この実施形態のボールねじ２０Ａ
は、第１の実施形態において、ボールねじ軸２１に連結
溝２７を形成する構成、および遮蔽部材２８を設ける構
成に変えて、表面に連結溝２７Ａを有する駒部材２９を
ボールねじ軸２１に装着したものである。駒部材２９の
連結溝２７Ａは、外ねじ溝２４の隣合う１周部分同士を
連結する溝であり、第１の実施形態における遮蔽部材２
８の端面２８ａで形成される案内面を兼ねる。ボールね
じ軸２１には中空軸が用いられ、駒部材２９を装着する
駒部材嵌合用開口３０が内外の周面に貫通して形成され
ている。FIG. 2 shows a ball screw according to the second embodiment of the present invention. Ball screw 20A of this embodiment
In place of the configuration in which the connection groove 27 is formed in the ball screw shaft 21 and the configuration in which the shielding member 28 is provided in the first embodiment, the piece member 29 having the connection groove 27A on the surface is attached to the ball screw shaft 21. It was done. The connecting groove 27A of the piece member 29 is a groove for connecting adjacent one circumferential portions of the external thread groove 24, and the shielding member 2 in the first embodiment.
8 also serves as a guide surface formed by the end surface 28a. A hollow shaft is used as the ball screw shaft 21, and a piece member fitting opening 30 for mounting the piece member 29 is formed so as to penetrate through the inner and outer peripheral surfaces.
【００１７】駒部材２９には、ボールねじ軸２１の外ね
じ溝２４の一部に嵌合する係止部２９ａが一体形成され
ており、この係止部２９ａを外ねじ溝２４に嵌合させる
ことで、位置精度良く駒部材２９をボールねじ軸２１に
装着できる。駒部材２９はボールねじ軸２１に対して複
数個が軸方向に並べて設けてあり、これによりボールね
じ軸２１の外ねじ溝２４は、複数条並んだ周回経路に分
割される。この実施形態におけるその他の構成は第１の
実施形態と同じである。The piece member 29 is integrally formed with a locking portion 29a which fits into a part of the outer screw groove 24 of the ball screw shaft 21, and the locking portion 29a is fitted into the outer screw groove 24. Thus, the piece member 29 can be mounted on the ball screw shaft 21 with high positional accuracy. A plurality of the piece members 29 are arranged side by side in the axial direction with respect to the ball screw shaft 21, so that the outer screw groove 24 of the ball screw shaft 21 is divided into a plurality of circumferential paths. Other configurations in this embodiment are the same as those in the first embodiment.
【００１８】この構成のボールねじ２０によると、ボー
ルねじ軸２１に連結溝２７を有する駒部材２９を装着
し、ボール２３を循環させる周回経路を構成したため、
ナット２２に前記周回経路を構成するための循環部材を
配置する必要がない。そのためナット２２の外径を小さ
くでき、ボールねじ２０をコンパクトに構成できる。こ
の実施形態の場合も、駒部材２９を回転しないボールね
じ軸２１側に設置するので、ボールねじ２０の取付時に
モーメント荷重やラジアル荷重の加わる方向が予め分か
っている場合には、前記駒部材２９を負荷の少ない位置
に片寄せて配置するように容易に設計することができ、
これによりボールねじ２０の長寿命化が可能となる。ま
た、駒部材２９には、ボールねじ軸２１の外ねじ溝２４
に嵌合する係止部２９ａを一体形成しているので、位置
精度良く駒部材２９をボールねじ軸２１に装着できる。According to the ball screw 20 having this structure, the piece member 29 having the connecting groove 27 is mounted on the ball screw shaft 21 to form the circulating path for circulating the ball 23.
It is not necessary to arrange a circulation member in the nut 22 to form the circulating path. Therefore, the outer diameter of the nut 22 can be reduced, and the ball screw 20 can be made compact. Also in this embodiment, since the piece member 29 is installed on the side of the ball screw shaft 21 that does not rotate, when the direction in which the moment load or the radial load is applied when the ball screw 20 is attached is known in advance, the piece member 29 is used. Can be easily designed to be placed in a position with less load,
As a result, the life of the ball screw 20 can be extended. Further, the piece member 29 has an outer thread groove 24 of the ball screw shaft 21.
Since the locking portion 29a that fits into the ball screw shaft 21 is integrally formed, the piece member 29 can be mounted on the ball screw shaft 21 with high positional accuracy.
【００１９】なお、この実施形態において、駒部材２９
の係止部２９ａは必ずしも設けなくても良い。係止部２
９ａを設けない場合は、駒部材２９ａを駒部材嵌合用開
口３０に内側から嵌合させることができるため、係止部
２９ａを設けるか否かで、組立方法が変わる。係止部２
９ａを設ける場合は、駒部材２９を軸外側から嵌め込
み、中空穴３１側から加締または接着等で駒部材２９を
ボールねじ軸２１に固定するようにすることが好まし
い。これにより容易にかつ堅固に固定が行える。係止部
２９ａを設けない場合は、駒部材２９を、ボールねじ軸
２１の中空穴３１内に挿入して、内側から駒部材嵌合用
開口３０に嵌合させて接着することにより、駒部材２９
をボールねじ軸２１に装着できる。この他の組立方法と
して、上記した手順で駒部材嵌合用開口３０に駒部材２
９を嵌合させた後に、中空穴３１内から駒部材嵌合用開
口３０の底部に埋め栓（図示せず）を設けることで、駒
部材２９を装着しても良い。In this embodiment, the piece member 29
It is not always necessary to provide the locking portion 29a. Locking part 2
If 9a is not provided, the piece member 29a can be fitted into the piece member fitting opening 30 from the inside, so the assembly method changes depending on whether or not the locking portion 29a is provided. Locking part 2
When 9a is provided, it is preferable that the piece member 29 is fitted from the outside of the shaft and the piece member 29 is fixed to the ball screw shaft 21 by caulking or adhering from the hollow hole 31 side. This allows for easy and firm fixation. When the locking portion 29a is not provided, the piece member 29 is inserted into the hollow hole 31 of the ball screw shaft 21 and fitted to the piece member fitting opening 30 from the inside to be adhered.
Can be attached to the ball screw shaft 21. As another assembling method, the piece member 2 is inserted into the piece member fitting opening 30 by the above-described procedure.
After fitting 9 together, the bridge member 29 may be mounted by providing a plug (not shown) at the bottom of the bridge member fitting opening 30 from within the hollow hole 31.
【００２０】図３はこの発明の第３の実施形態を示す。
この実施形態は、図２の実施形態において、１本の連結
溝２７Ａを有する駒部材２９を設けた構成に変えて、複
数本の連結溝２７Ａを有する駒部材２９Ｂを用いたもの
である。駒部材２９の各連結溝２７Ａは、外ねじ溝２４
の隣合う１周部分同士を連結する溝である。この実施形
態におけるその他の構成は図２の実施形態と同じであ
る。FIG. 3 shows a third embodiment of the present invention.
This embodiment uses a piece member 29B having a plurality of connecting grooves 27A instead of the piece member 29 having one connecting groove 27A in the embodiment of FIG. Each connecting groove 27A of the piece member 29 has an external thread groove 24.
Is a groove that connects adjacent one-circumferential portions. The other structure in this embodiment is the same as that of the embodiment of FIG.
【００２１】この構成のボールねじ２０Ｂの場合、ボー
ルねじ軸２１に１つの駒部材２９Ｂを装着するだけで、
外ねじ溝２４を軸方向に並ぶ複数条（図示の例では３
条）の周回経路に分割することができる。In the case of the ball screw 20B having this structure, it suffices to mount one piece member 29B on the ball screw shaft 21.
A plurality of threads (3 in the example shown in the figure) are arranged along the outer thread groove 24 in the axial direction.
Article) can be divided into circular routes.
【００２２】[0022]
【発明の効果】この発明の第１の発明のボールねじは、
ボールねじ軸に、ねじ溝同士を連結する連結溝を形成す
ると共に遮蔽部材を装着したため、ナットの外径を小さ
くでき、ボールねじをコンパクトに構成できる。また、
ボールねじ軸を回転不可とし、この回転不可のボールね
じ軸側に遮蔽部材を設置するので、ボールねじの取付時
に偏荷重が加わることが予想される場合には、前記遮蔽
部材を負荷の少ない位置に片寄せて配置するように容易
に設計することができ、長寿命化が可能となる。遮蔽部
材が、ねじ溝と同じリードを有する螺旋状の線材からな
る場合は、遮蔽部材の構成が簡単で、また遮蔽部材をね
じ溝に嵌め込むことによりボールねじ軸へ容易に装着す
ることができる。この発明の第２の発明のボールねじ
は、ボールねじ軸に、連結溝を有する駒部材を装着した
ため、ナットの外径を小さくでき、ボールねじをコンパ
クトに構成できる。また、駒部材を回転不可のボールね
じ軸側に設置するので、ボールねじの取付時に偏荷重が
加わることが予想される場合には、前記駒部材を負荷の
少ない位置に片寄せて配置するように容易に設計するこ
とができ、長寿命化が可能となる。上記ねじ溝に嵌合す
る係止部を駒部材に一体形成した場合は、位置精度良く
駒部材をボールねじ軸に装着できる。また、ボールねじ
軸を中空とし、この内径側から上記駒部材を装着すると
共に、この駒部材を塑性変形により上記ボールねじ軸に
固定した場合は、塑性変形処理をボールねじ軸の中空穴
側から行えるので、駒部材の取付けを容易に行うことが
できる。The ball screw of the first invention of the present invention comprises:
Since the connecting groove for connecting the screw grooves is formed on the ball screw shaft and the shielding member is attached, the outer diameter of the nut can be reduced and the ball screw can be made compact. Also,
Since the ball screw shaft is not rotatable and the shielding member is installed on the non-rotatable ball screw shaft side, if an unbalanced load is expected to be applied when mounting the ball screw, place the shielding member on a position with less load. It can be easily designed so as to be placed closer to one another, and the life can be extended. When the shield member is made of a spiral wire having the same lead as the screw groove, the shield member has a simple structure and can be easily mounted on the ball screw shaft by fitting the shield member into the screw groove. . In the ball screw according to the second aspect of the present invention, since the piece member having the connecting groove is mounted on the ball screw shaft, the outer diameter of the nut can be reduced and the ball screw can be made compact. Further, since the piece member is installed on the non-rotatable ball screw shaft side, if it is expected that an unbalanced load will be applied when the ball screw is attached, the piece member should be offset to a position where the load is small. It can be designed easily and can have a long life. When the locking portion that fits into the screw groove is integrally formed with the piece member, the piece member can be mounted on the ball screw shaft with high positional accuracy. When the ball screw shaft is hollow and the piece member is mounted from the inner diameter side and the piece member is fixed to the ball screw shaft by plastic deformation, the plastic deformation process is performed from the hollow hole side of the ball screw shaft. Since it can be performed, the piece member can be easily attached.
【図１】（Ａ），（Ｂ）は、各々この発明の一実施形態
にかかるボールねじの断面正面図および破断側面図であ
る。1A and 1B are respectively a sectional front view and a broken side view of a ball screw according to an embodiment of the present invention.
【図２】（Ａ），（Ｂ）は、各々この発明の他の実施形
態にかかるボールねじの断面正面図および破断側面図で
ある。2A and 2B are respectively a sectional front view and a broken side view of a ball screw according to another embodiment of the present invention.
【図３】同ボールねじの変形例を示す断面正面図であ
る。FIG. 3 is a sectional front view showing a modified example of the ball screw.
【図４】従来例の破断正面図である。FIG. 4 is a cutaway front view of a conventional example.
２０，２０Ａ，２０Ｂ…ボールねじ ２１…ボールねじ軸 ２２…ナット ２３…ボール ２４…外ねじ溝 ２５…内ねじ溝 ２６…転動路 ２７，２７Ａ…連結溝 ２８…遮蔽部材 ２８ａ…端面 ２９，２９Ｂ…駒部材 ２９ａ…係止部 ３０…駒部材嵌合用開口 ３１…中空穴 20, 20A, 20B ... Ball screw 21 ... Ball screw shaft 22 ... Nut 23 ... Ball 24 ... External thread groove 25 ... Inner thread groove 26 ... Rolling path 27, 27A ... Connection groove 28 ... Shielding member 28a ... end face 29, 29B ... Piece member 29a ... Locking part 30 ... Opening for piece member fitting 31 ... Hollow hole
───────────────────────────────────────────────────── フロントページの続き (72)発明者 吉岡 守久 静岡県磐田市東貝塚1578番地 エヌティエ ヌ株式会社内 Ｆターム(参考） 3J062 AB22 AC07 BA12 BA16 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Morihisa Yoshioka Entier, 1578 Higashi-Kaizuka, Iwata City, Shizuoka Prefecture Nu Co., Ltd. F-term (reference) 3J062 AB22 AC07 BA12 BA16
Claims (5)
ルねじ軸と、このボールねじ軸に対向して内周に内ねじ
溝を有し、回転可能で、かつ軸方向移動不可なナット
と、上記ボールねじ軸と内ねじ溝との間に形成された転
動路に連なって配置され、上記ナットとボールねじ軸の
間で力を伝達するための複数のボールとを備え、ねじ溝
同士を連結し、上記ボールが循環する連結溝を上記ボー
ルねじ軸に形成すると共に、ボールを元のねじ溝に戻す
ための遮蔽部材を装着したことを特徴とするボールね
じ。1. A ball screw shaft which is non-rotatable and movable in the axial direction, and a nut which has an inner screw groove on the inner circumference facing the ball screw shaft and is rotatable and non-movable in the axial direction. A plurality of balls for transmitting force between the nut and the ball screw shaft, which are arranged in series with a rolling path formed between the ball screw shaft and the inner screw groove, A ball screw, in which a connecting groove through which the ball circulates is formed on the ball screw shaft, and a shielding member for returning the ball to the original screw groove is attached.
有する螺旋状の線材からなり、この線材を上記ボールね
じ軸のねじ溝に嵌合した請求項１に記載のボールねじ。2. The ball screw according to claim 1, wherein the shielding member is made of a spiral wire rod having the same lead as the screw groove, and the wire rod is fitted in the screw groove of the ball screw shaft.
ルねじ軸と、このボールねじ軸に対向して内周に内ねじ
溝を有し、回転可能で、かつ軸方向移動不可なナット
と、上記ボールねじ軸と内ねじ溝との間に形成された転
動路に連なって配置され、上記ナットとボールねじ軸の
間で力を伝達するための複数のボールとを備え、ねじ溝
同士を連結し、上記ボールが循環する連結溝を有する駒
部材を上記ボールねじ軸に装着したことを特徴とするボ
ールねじ。3. A ball screw shaft which is non-rotatable and movable in the axial direction, and a nut which has an inner screw groove on the inner periphery facing the ball screw shaft and is rotatable and non-movable in the axial direction. A plurality of balls for transmitting force between the nut and the ball screw shaft, which are arranged in series with a rolling path formed between the ball screw shaft and the inner screw groove, And a piece member having a connecting groove through which the ball circulates is mounted on the ball screw shaft.
材に一体形成した請求項３に記載のボールねじ。4. The ball screw according to claim 3, wherein a locking portion that fits into the screw groove is integrally formed with the piece member.
ルねじ軸に内径側から上記駒部材を装着すると共に、こ
の駒部材を塑性変形により上記ボールねじ軸に固定した
請求項３または請求項４に記載のボールねじ。5. The ball screw shaft is hollow, the piece member is attached to the ball screw shaft from the inner diameter side, and the piece member is fixed to the ball screw shaft by plastic deformation. Ball screw described in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001204287A JP4098499B2 (en) | 2001-07-05 | 2001-07-05 | Ball screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001204287A JP4098499B2 (en) | 2001-07-05 | 2001-07-05 | Ball screw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003021217A true JP2003021217A (en) | 2003-01-24 |
| JP4098499B2 JP4098499B2 (en) | 2008-06-11 |
Family
ID=19040783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001204287A Expired - Lifetime JP4098499B2 (en) | 2001-07-05 | 2001-07-05 | Ball screw |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4098499B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104418216A (en) * | 2013-08-22 | 2015-03-18 | 陈铭津 | Rotating member for lifting device |
| KR101534057B1 (en) * | 2014-06-16 | 2015-07-06 | 하이윈 테크놀로지스 코포레이션 | Ball screw assembly having a tunnel raceway |
| WO2015137494A1 (en) * | 2014-03-14 | 2015-09-17 | Ntn株式会社 | Ball screw and method for producing same |
| JP2015190471A (en) * | 2014-03-27 | 2015-11-02 | Ntn株式会社 | ball screw |
-
2001
- 2001-07-05 JP JP2001204287A patent/JP4098499B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104418216A (en) * | 2013-08-22 | 2015-03-18 | 陈铭津 | Rotating member for lifting device |
| WO2015137494A1 (en) * | 2014-03-14 | 2015-09-17 | Ntn株式会社 | Ball screw and method for producing same |
| JP2015175406A (en) * | 2014-03-14 | 2015-10-05 | Ntn株式会社 | Ball screw and its manufacturing method |
| JP2015190471A (en) * | 2014-03-27 | 2015-11-02 | Ntn株式会社 | ball screw |
| KR101534057B1 (en) * | 2014-06-16 | 2015-07-06 | 하이윈 테크놀로지스 코포레이션 | Ball screw assembly having a tunnel raceway |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4098499B2 (en) | 2008-06-11 |
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