JP2005207527A - Cylindrical roller screw device - Google Patents

Cylindrical roller screw device Download PDF

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JP2005207527A
JP2005207527A JP2004016047A JP2004016047A JP2005207527A JP 2005207527 A JP2005207527 A JP 2005207527A JP 2004016047 A JP2004016047 A JP 2004016047A JP 2004016047 A JP2004016047 A JP 2004016047A JP 2005207527 A JP2005207527 A JP 2005207527A
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cylindrical roller
cylindrical
cage
screw
nut
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Kenichi Sugiyama
健一 杉山
Masahito Taniguchi
雅人 谷口
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NSK Ltd
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NSK Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller screw device unlikely to cause poor performance of operation and a frictional motion, and capable of being constructed at low cost. <P>SOLUTION: The cylindrical roller screw device is equipped with a screw shaft 1 furnished at the outside surface with thread grooves 1a having approximately a V-section continuing spirally, a nut 2 furnished at the inside surface with thread grooves 2a having approximately a V-section mating with the thread grooves 1a in the screw shaft 1, and a plurality of cylindrical rollers 3 interposed between the two groups of thread grooves 1a and 2a in such a way as capable of rolling. Retainer guide cylinder portions 5 approximately in a cylindrical shape are provided at the two ends in the axial direction of the nut 2. A retainer 4 approximately in a cylindrical shape to hold the rollers 3 rolling between the two groups of grooves 1a and 2a is interposed between the screw shaft 1 and the nut 2. The retainer 4 has pockets 4a to accommodate the rollers 3, which roll in the condition held in the specified position of the retainer 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、非循環式の円筒ころねじ装置に関する。   The present invention relates to a non-circular cylindrical roller screw device.

直線運動する機械部品を駆動するために転がりねじ装置が使用されており、その中でも、転動体としてボールを用いたボールねじ装置が最もよく使用されている。ボールねじ装置は、ボールと軌道面とが点接触しているため、作動効率が良好である反面、負荷容量が小さいという問題があった。よって、射出成形機，プレス機等における駆動装置のように大きな負荷容量が必要となる場合には、ボールねじ装置は適用できない場合があった。   Rolling screw devices are used to drive linearly moving mechanical parts, and among them, ball screw devices using balls as rolling elements are most often used. Since the ball screw device is in point contact with the ball and the raceway surface, the operation efficiency is good, but the load capacity is small. Therefore, when a large load capacity is required as in a drive device in an injection molding machine, a press machine, etc., the ball screw device may not be applicable.

このようなことから、高負荷容量の転がりねじ装置として、転動体としてころを用いたころねじ装置が提案されている（特許文献１，２を参照）。
特開平７−７７２６１号公報 特開平１１−２１０８５８号公報 特開２００１−２６３４４５号公報 For this reason, roller screw devices using rollers as rolling elements have been proposed as high load capacity rolling screw devices (see Patent Documents 1 and 2).
JP-A-7-77261 JP-A-11-210858 JP 2001-263445 A

特許文献１，２に記載のころねじ装置は、循環式のころねじ装置である。すなわち、ねじ軸とナットとの間に形成された転動体転動路内を転動するころを、転動体転動路の終点において掬い上げ、転動体戻し路を介して転動体転動路の始点に戻すことによって、ころを無限に循環させるという機構を有しているころねじ装置である。
しかしながら、このような循環式のころねじ装置は、ころを循環させる機構が複雑であるため、作動不良が生じやすく、また、製造コストが高いという問題があった。さらに、転動体転動路内に複数のころが配置されているとともに、転動体戻し路を有しているため、転動体転動路内においてころが等配に配置されず（隣接するころ間の隙間にばらつきが生じる）、ころ同士に競り合いが生じる場合があった。 The roller screw device described in Patent Literatures 1 and 2 is a circulating roller screw device. That is, the roller that rolls in the rolling element rolling path formed between the screw shaft and the nut is scooped up at the end of the rolling element rolling path, and the rolling element rolling path passes through the rolling element return path. It is a roller screw device having a mechanism of circulating the rollers infinitely by returning to the starting point.
However, such a circulation type roller screw device has a problem that operation failure is likely to occur and the manufacturing cost is high because the mechanism for circulating the rollers is complicated. Furthermore, since the plurality of rollers are arranged in the rolling element rolling path and the rolling element return path is provided, the rollers are not evenly arranged in the rolling element rolling path (between adjacent rollers). In some cases, there is a variation in the gap between the rollers).

このような競り合いを抑制することを目的として、ころ用リテーナを備えたころねじ装置が特許文献３に提案されている。しかしながら、リテーナの構造が複雑であるため、ころねじ装置の製造コストが高くなるという問題があった。
そこで、本発明は、上記のような従来のころねじ装置が有する問題点を解決するものであり、作動不良や競り合いが生じにくく且つ安価なころねじ装置を提供することを課題とする。 Patent Document 3 proposes a roller screw device provided with a roller retainer for the purpose of suppressing such competition. However, since the structure of the retainer is complicated, there is a problem that the manufacturing cost of the roller screw device increases.
Therefore, the present invention solves the problems of the conventional roller screw device as described above, and an object thereof is to provide an inexpensive roller screw device that is unlikely to cause malfunction and competition.

前記課題を解決するため、本発明は次のような構成からなる。すなわち、本発明に係る円筒ころねじ装置は、螺旋状に連続する断面略Ｖ字状のねじ溝が外周面に形成されたねじ軸と、前記ねじ軸のねじ溝に対向する断面略Ｖ字状のねじ溝が内周面に形成されたナットと、前記両ねじ溝間に転動自在に介装された複数の円筒ころと、を備え、前記ねじ軸と前記ナットとの相対回転運動により、前記円筒ころの転動を介して、前記ねじ軸と前記ナットとが軸方向へ相対移動するようになっている円筒ころねじ装置において、前記両ねじ溝間に前記円筒ころを転動自在に保持する略円筒形状の保持器が、前記ねじ軸と前記ナットとの間に介装されていて、前記円筒ころは前記保持器の所定位置に保持された状態で転動するようになっていることを特徴とする。
前記保持器は、かご形型式又はもみ抜き型式の保持器としてもよい。また、前記保持器は、耐摩耗性を向上させる硬質皮膜を有していてもよい。 In order to solve the above problems, the present invention has the following configuration. That is, the cylindrical roller screw device according to the present invention includes a screw shaft in which a spiral groove having a substantially V-shaped cross section is formed on the outer peripheral surface, and a substantially V-shaped cross section facing the screw groove of the screw shaft. And a plurality of cylindrical rollers interposed between the two screw grooves so as to be capable of rolling, and by a relative rotational motion of the screw shaft and the nut, In the cylindrical roller screw device in which the screw shaft and the nut move relative to each other in the axial direction via the rolling of the cylindrical roller, the cylindrical roller is rotatably held between the screw grooves. A substantially cylindrical retainer is interposed between the screw shaft and the nut, and the cylindrical roller is configured to roll while being held at a predetermined position of the retainer. It is characterized by.
The cage may be a cage type or a machined type cage. The cage may have a hard film that improves wear resistance.

本発明の円筒ころねじ装置は、作動不良や競り合いが生じにくく且つ安価である。   The cylindrical roller screw device of the present invention is less prone to malfunction and competition, and is inexpensive.

本発明に係る円筒ころねじ装置の実施の形態を、図面を参照しながら詳細に説明する。図１は、本発明の一実施形態である円筒ころねじ装置の軸方向に平行な平面で破断した断面図であり、図２は、図１の円筒ころねじ装置の部分拡大断面図である。
図１，２に示すように、本実施形態の円筒ころねじ装置は、螺旋状に連続する断面略Ｖ字状のねじ溝１ａが外周面に形成されたねじ軸１と、ねじ軸１のねじ溝１ａに対向する断面略Ｖ字状のねじ溝２ａが内周面に形成されたナット２と、両ねじ溝１ａ，２ａ間に転動自在に介装された複数の円筒ころ３と、を備えている。ナット２の軸方向両端には、略円筒形状の保持器案内円筒部５，５が設けられていて、保持器案内円筒部５に挿通されるねじ軸１のねじ溝１ａ上に位置する円筒ころ３が、保持器案内円筒部５の内周面に接触するようになっている。 Embodiments of a cylindrical roller screw device according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view taken along a plane parallel to the axial direction of a cylindrical roller screw device according to an embodiment of the present invention, and FIG. 2 is a partially enlarged sectional view of the cylindrical roller screw device of FIG.
As shown in FIGS. 1 and 2, the cylindrical roller screw device according to the present embodiment includes a screw shaft 1 in which a screw groove 1 a having a substantially V-shaped cross section that is spirally continuous is formed on the outer peripheral surface, A nut 2 in which a thread groove 2a having a substantially V-shaped cross section facing the groove 1a is formed on the inner peripheral surface, and a plurality of cylindrical rollers 3 interposed between the thread grooves 1a and 2a so as to be freely rollable. I have. At both ends in the axial direction of the nut 2, substantially cylindrical cage guide cylindrical portions 5, 5 are provided, and cylindrical rollers located on the thread groove 1 a of the screw shaft 1 inserted through the cage guide cylindrical portion 5. 3 comes into contact with the inner peripheral surface of the cage guide cylindrical portion 5.

また、両ねじ溝１ａ，２ａ間に円筒ころ３を転動自在に保持する略円筒形状の保持器４が、ねじ軸１とナット２との間に介装されている。この保持器４は、円筒ころ３が収納されるポケット４ａを有しており、円筒ころ３は保持器４の所定位置（すなわちポケット４ａ）に保持された状態で転動するようになっている。
このような円筒ころねじ装置のねじ軸１とナット２とを相対回転運動させると、円筒ころ３は保持器４に保持された状態で両ねじ溝１ａ，２ａ間を転動し、この円筒ころ３の転動を介して、ナット２と保持器４とがねじ軸１に対して軸方向へ相対移動する。ねじ軸１の外周面とナット２の内周面との間（以降は「ねじ軸−ナット間」と記す）以外の部分に位置している保持器４及び円筒ころ３は、ねじ軸１の外周面と保持器案内円筒部５の内周面との間に位置しているので、円筒ころ３が軸方向へ相対移動する際には、ねじ軸−ナット間以外の部分に位置している円筒ころ３は保持器案内円筒部５の内周面に案内されて軸方向に相対移動することとなり、この円筒ころ３の相対移動に伴って保持器４も相対移動することとなる。 Further, a substantially cylindrical cage 4 that rotatably holds the cylindrical roller 3 between the screw grooves 1 a and 2 a is interposed between the screw shaft 1 and the nut 2. The cage 4 has a pocket 4a in which the cylindrical roller 3 is accommodated, and the cylindrical roller 3 rolls while being held at a predetermined position of the cage 4 (that is, the pocket 4a). .
When the screw shaft 1 and the nut 2 of such a cylindrical roller screw device are relatively rotated, the cylindrical roller 3 rolls between the screw grooves 1a and 2a while being held by the cage 4, and this cylindrical roller 3, the nut 2 and the cage 4 move relative to the screw shaft 1 in the axial direction. The cage 4 and the cylindrical roller 3 located in a portion other than between the outer peripheral surface of the screw shaft 1 and the inner peripheral surface of the nut 2 (hereinafter referred to as “between the screw shaft and the nut”) Since it is located between the outer peripheral surface and the inner peripheral surface of the cage guide cylindrical portion 5, when the cylindrical roller 3 is relatively moved in the axial direction, it is positioned at a portion other than between the screw shaft and the nut. The cylindrical roller 3 is guided by the inner peripheral surface of the cage guide cylindrical portion 5 and relatively moves in the axial direction, and the cage 4 also moves relative to the relative movement of the cylindrical roller 3.

例えば、図３に示すように、ねじ軸１とナット２との相対回転運動により、ナット２が長さＬだけ右方に移動したとすると、円筒ころ３及び保持器４は長さＬ１だけ右方に移動する。
従来のころねじ装置は、前述のように、ころを循環させる機構を備えた循環式のころねじ装置である。すなわち、ねじ軸とナットとの間に形成された転動体転動路内を転動するころを、転動体転動路の終点において掬い上げ、転動体戻し路を介して転動体転動路の始点に戻すことによって、ころを無限に循環させるという機構を有しているころねじ装置である。 For example, as shown in FIG. 3, if the nut 2 is moved to the right by the length L due to the relative rotational movement of the screw shaft 1 and the nut 2, the cylindrical roller 3 and the cage 4 are moved to the right by the length L1. Move towards.
As described above, the conventional roller screw device is a circulating roller screw device provided with a mechanism for circulating rollers. That is, the roller that rolls in the rolling element rolling path formed between the screw shaft and the nut is scooped up at the end of the rolling element rolling path, and the rolling element rolling path passes through the rolling element return path. It is a roller screw device having a mechanism of circulating the rollers infinitely by returning to the starting point.

これに対して本実施形態の円筒ころねじ装置は、ころを循環させる機構を備えていない非循環式のころねじ装置である。すなわち、円筒ころ３は保持器４に保持され、しかも保持器４の所定位置（ポケット４ａ）に保持された状態を保ちながらねじ軸１とナット２との間で転動するようになっており、ナット２の相対移動に伴って保持器４に保持された状態で相対移動するようになっているので、円筒ころ３を循環させることなく円筒ころねじ装置を作動させることができる。   On the other hand, the cylindrical roller screw device of this embodiment is a non-circular roller screw device that does not include a mechanism for circulating the rollers. That is, the cylindrical roller 3 is held by the cage 4 and rolls between the screw shaft 1 and the nut 2 while maintaining the state of being held in a predetermined position (pocket 4a) of the cage 4. Since the nut 2 is moved relative to the cage 4 while being held by the cage 4, the cylindrical roller screw device can be operated without circulating the cylindrical roller 3.

このような本実施形態の円筒ころねじ装置は、ころを循環させる機構を備えておらず構造が単純であるため、製造が容易で安価であり且つ作動不良が生じにくい。また、保持器４により各円筒ころ３が所定の間隔を空けて等配に配され（隣接する円筒ころ間の隙間にばらつきがほとんどない）、且つ円筒ころ３の姿勢が一定に保たれるので、円筒ころ同士の競り合いが抑制される。よって、競り合いを抑制することを目的として、隣接する円筒ころ間にリテーナを介装する必要もない。   Since the cylindrical roller screw device of this embodiment is not provided with a mechanism for circulating the rollers and has a simple structure, it is easy to manufacture and inexpensive, and hardly causes malfunction. In addition, since the cylindrical rollers 3 are arranged at equal intervals with a predetermined interval by the cage 4 (the gap between adjacent cylindrical rollers has almost no variation), and the posture of the cylindrical rollers 3 is kept constant. The competition between the cylindrical rollers is suppressed. Therefore, it is not necessary to interpose a retainer between adjacent cylindrical rollers for the purpose of suppressing competition.

ここで、保持器４について詳細に説明する。本実施形態の円筒ころねじ装置に使用される保持器４は、図４に示すようなかご形型式の保持器であり、軸方向に延びる帯状の開口からなるポケット４ａを複数備え、全体として略円筒形状をなしている。そして、図５の部分斜視図（ただし、ナット２及び保持器案内円筒部５は存在しないものとして、円筒ころ３及び保持器４を図示してある）から分かるように、各ポケット４ａに複数の円筒ころ３が一列に並んで収納されている。   Here, the cage 4 will be described in detail. The cage 4 used in the cylindrical roller screw device of the present embodiment is a cage-type cage as shown in FIG. 4, and includes a plurality of pockets 4 a made up of strip-shaped openings extending in the axial direction, and is substantially a whole. It has a cylindrical shape. As can be seen from the partial perspective view of FIG. 5 (however, the cylindrical roller 3 and the retainer 4 are shown as if the nut 2 and the retainer guide cylindrical portion 5 are not present), a plurality of pockets 4 a Cylindrical rollers 3 are stored in a line.

なお、保持器４の種類は、図６に示すようなもみ抜き型式の保持器でもよい。すなわち、全体として略円筒形状をなし、１個の円筒ころ３を収納する略円形のポケットの複数が、両ねじ溝１ａ，２ａに対応するように螺旋状に並べて設けられた保持器でもよい。また、保持器４の材質としては、金属，樹脂等が好適である。さらに、保持器４の表面のうち、円筒ころ３，ねじ軸１，ナット２と接触する部分には、耐摩耗性を向上させる硬質皮膜を形成してもよい。そうすれば、保持器４の耐久性が向上し、円筒ころねじ装置が長寿命となる。硬質皮膜としては、例えば、ダイヤモンドライクカーボン，ＣｒＮ，ＴｉＮ等の皮膜があげられる。   The type of the cage 4 may be a machined type cage as shown in FIG. That is, a cage having a substantially cylindrical shape as a whole and a plurality of substantially circular pockets for accommodating one cylindrical roller 3 arranged in a spiral shape so as to correspond to both screw grooves 1a and 2a may be used. Moreover, as a material of the cage 4, a metal, a resin, or the like is preferable. Furthermore, you may form the hard film which improves abrasion resistance in the part which contacts the cylindrical roller 3, the screw shaft 1, and the nut 2 among the surfaces of the holder | retainer 4. FIG. If it does so, durability of the holder | retainer 4 will improve and a cylindrical roller screw apparatus will become a long life. Examples of the hard coating include diamond-like carbon, CrN, TiN coatings, and the like.

図７に示すように、保持器４のポケット４ａの幅は、円筒ころ３の直径よりも若干大きく設計されており、このため円筒ころ３を円周上に均等に配置することができる。ポケット４ａの幅は、円筒ころ３の直径よりも０．０５〜０．４ｍｍ大きい方が好ましい。このように、ポケット４ａの寸法が大きいので、保持器４を製造する際に高い加工精度を必要としない。よって、プレス加工を用いた打ち抜き保持器や、射出成形等を用いた成形保持器を採用することもできる。   As shown in FIG. 7, the width of the pocket 4a of the cage 4 is designed to be slightly larger than the diameter of the cylindrical roller 3, so that the cylindrical roller 3 can be evenly arranged on the circumference. The width of the pocket 4a is preferably 0.05 to 0.4 mm larger than the diameter of the cylindrical roller 3. Thus, since the dimension of the pocket 4a is large, when manufacturing the holder | retainer 4, a high processing precision is not required. Therefore, it is possible to employ a punching cage using press working or a molding cage using injection molding or the like.

また、図２から分かるように、保持器４は、その外周面がナット２の内周面と近接していて、軸方向に相対移動する際にはナット２によって案内される（ナット案内）。ただし、図８に示すように、保持器４の内周面をねじ軸１の外周面と近接させて、軸方向に相対移動する際にはねじ軸１によって案内されるようにしてもよい（ねじ軸案内）。ねじ軸１の直径が５０〜１２０ｍｍである場合には、近接する保持器４の外周面とナット２の内周面との間の隙間、又は、保持器４の内周面とねじ軸１の外周面との間の隙間は、０．１〜０．８ｍｍ程度とすることが好ましい。   As can be seen from FIG. 2, the retainer 4 is guided by the nut 2 when the outer peripheral surface thereof is close to the inner peripheral surface of the nut 2 and relatively moves in the axial direction (nut guide). However, as shown in FIG. 8, the inner peripheral surface of the cage 4 may be brought close to the outer peripheral surface of the screw shaft 1 and guided by the screw shaft 1 when moving relative to the axial direction ( Screw shaft guide). When the diameter of the screw shaft 1 is 50 to 120 mm, the gap between the outer peripheral surface of the adjacent cage 4 and the inner peripheral surface of the nut 2 or the inner peripheral surface of the cage 4 and the screw shaft 1 The gap between the outer peripheral surface is preferably about 0.1 to 0.8 mm.

次に、円筒ころ３について詳細に説明する。図２から分かるように、本実施形態においては、円筒ころ３のころ直径ところ長さとはほぼ同一であるが、図９のように前記両者が同一でない円筒ころを用いてもよい。また、本実施形態のように端面が平面である円筒ころでもよいが、端面が曲面である円筒ころでもよいし、円すいころでもよい。
また、本実施形態の円筒ころねじ装置においては、ねじ軸１及びナット２のねじ溝１ａ，２ａが２つの溝面１０，１０で構成され、断面略Ｖ字状をなしている（図１０を参照）。そして、この溝面１０とねじ軸１の外周面又はナット２の内周面とのなす角度は、４５°である。ただし、この角度は必ずしも４５°に設定する必要はなく、例えば図１１に示すように６０°としてもよい。 Next, the cylindrical roller 3 will be described in detail. As can be seen from FIG. 2, in the present embodiment, the roller diameter and length of the cylindrical roller 3 are substantially the same, but cylindrical rollers that are not the same as shown in FIG. 9 may be used. In addition, a cylindrical roller having a flat end surface as in the present embodiment may be used, but a cylindrical roller having a curved end surface may be used, or a tapered roller may be used.
Further, in the cylindrical roller screw device of the present embodiment, the thread grooves 1a and 2a of the screw shaft 1 and the nut 2 are constituted by two groove surfaces 10 and 10 and have a substantially V-shaped cross section (see FIG. 10). reference). The angle formed by the groove surface 10 and the outer peripheral surface of the screw shaft 1 or the inner peripheral surface of the nut 2 is 45 °. However, this angle is not necessarily set to 45 °, and may be set to 60 ° as shown in FIG. 11, for example.

さらに、円筒ころねじ装置においては、ねじ溝１ａ，２ａを構成する２つの溝面１０，１０のうち一方に円筒ころ３の転動面が転がり接触し（すなわち、この溝面１０上を円筒ころ３が転動する）、他方に円筒ころ３の端面が接触することとなり、いずれの溝面１０に円筒ころ３が転がり接触するようにしても差し支えない。本実施形態の円筒ころねじ装置においては、図１２に示すように、全ての円筒ころ３が同一の溝面１０に転がり接触するようにしているが、一部の円筒ころ３を一方の溝面１０に転がり接触させ、他部の円筒ころ３を他方の溝面１０に転がり接触させてもよい。例えば、図１３に示すように、一方の溝面１０に転がり接触させた円筒ころ３Ａと、他方の溝面１０に転がり接触させた円筒ころ３Ｂとを、ねじ溝１ａ，２ａに沿って交互に並べて配してもよい（以降は、クロス配置と記す）。このように円筒ころ３をクロス配置すれば、両方向の軸方向荷重を支持することが可能となる。   Further, in the cylindrical roller screw device, the rolling surface of the cylindrical roller 3 is in rolling contact with one of the two groove surfaces 10 and 10 constituting the screw grooves 1a and 2a (that is, the cylindrical roller is placed on the groove surface 10). 3 rolls), and the end surface of the cylindrical roller 3 comes into contact with the other, and the cylindrical roller 3 may be brought into rolling contact with any groove surface 10. In the cylindrical roller screw device of this embodiment, as shown in FIG. 12, all the cylindrical rollers 3 are in rolling contact with the same groove surface 10, but some cylindrical rollers 3 are connected to one groove surface. The other cylindrical roller 3 may be brought into rolling contact with the other groove surface 10. For example, as shown in FIG. 13, cylindrical rollers 3 </ b> A that are in rolling contact with one groove surface 10 and cylindrical rollers 3 </ b> B that are in rolling contact with the other groove surface 10 are alternately arranged along screw grooves 1 a and 2 a. They may be arranged side by side (hereinafter referred to as cross arrangement). If the cylindrical rollers 3 are arranged in a cross manner in this way, it is possible to support axial loads in both directions.

保持器４が図６のもみ抜き型式の保持器である場合は、回転軸を傾斜させて配された円筒ころ３を収納するために、ポケット４ａも傾斜して形成されている。例えば、図１４に示すように、ポケット４ａをなす穴は、保持器４の外周面に対して４５°をなす方向を向いて形成されている。よって、前述のように円筒ころ３をクロス配置する場合には、図１５に示すように、傾斜方向の異なる２種のポケット４ａを、円筒ころ３の向きに合わせて交互に配置する必要がある。   When the cage 4 is the machined type cage shown in FIG. 6, the pocket 4a is also formed to be inclined in order to accommodate the cylindrical rollers 3 arranged with the rotation shaft inclined. For example, as shown in FIG. 14, the hole forming the pocket 4 a is formed so as to face a direction forming 45 ° with respect to the outer peripheral surface of the cage 4. Therefore, when the cylindrical rollers 3 are arranged in a cross manner as described above, it is necessary to alternately arrange two types of pockets 4a having different inclination directions in accordance with the direction of the cylindrical rollers 3, as shown in FIG. .

本発明の円筒ころねじ装置は、例えば、射出成形機やプレス機に使用可能である。   The cylindrical roller screw device of the present invention can be used in, for example, an injection molding machine or a press machine.

本発明の一実施形態である円筒ころねじ装置の断面図である。It is sectional drawing of the cylindrical roller screw apparatus which is one Embodiment of this invention. 図１の円筒ころねじ装置の部分拡大断面図である。It is a partial expanded sectional view of the cylindrical roller screw device of FIG. 円筒ころねじ装置の作動後の状態を説明する断面図である。It is sectional drawing explaining the state after the action | operation of a cylindrical roller screw apparatus. かご形型式の保持器の斜視図である。It is a perspective view of a cage type cage. 図１の円筒ころねじ装置の部分斜視図である。It is a fragmentary perspective view of the cylindrical roller screw device of FIG. もみ抜き型式の保持器の斜視図である。It is a perspective view of a machined type retainer. 保持器のポケットの幅と円筒ころの直径との関係を説明する図である。It is a figure explaining the relationship between the width | variety of the pocket of a holder | retainer, and the diameter of a cylindrical roller. ねじ軸案内の円筒ころねじ装置の部分拡大断面図である。It is a partial expanded sectional view of the cylindrical roller screw device of a screw shaft guide. ころ直径ところ長さとが同一でない円筒ころを用いた場合の円筒ころねじ装置の部分拡大断面図である。It is a partial expanded sectional view of a cylindrical roller screw device at the time of using a cylindrical roller whose roller diameter and length are not the same. ねじ溝の溝面を説明する部分拡大断面図である。It is a partial expanded sectional view explaining the groove surface of a screw groove. ねじ溝の溝面とねじ軸の外周面とのなす角度が６０°の場合の円筒ころねじ装置を説明する部分拡大断面図である。It is a partial expanded sectional view explaining a cylindrical roller screw device in case the angle which the groove surface of a screw groove and the outer peripheral surface of a screw shaft make is 60 degrees. 全ての円筒ころが同一の溝面に転がり接触するように配された円筒ころねじ装置の部分拡大図である。It is the elements on larger scale of the cylindrical roller screw apparatus distribute | arranged so that all the cylindrical rollers may roll-contact to the same groove surface. 円筒ころがクロス配置された円筒ころねじ装置の部分拡大図である。It is the elements on larger scale of the cylindrical roller screw device by which the cylindrical roller was cross-arranged. もみ抜き型式の保持器のポケットの構造を説明する保持器の部分断面図である。It is a fragmentary sectional view of a cage explaining the structure of a pocket of a machined type cage. 保持器がもみ抜き型式である場合の、円筒ころがクロス配置された円筒ころねじ装置の部分拡大図である。It is the elements on larger scale of the cylindrical roller screw device by which the cylindrical roller was cross-arranged in case a cage is a machined type.

符号の説明Explanation of symbols

１ ねじ軸
１ａ ねじ溝
２ ナット
２ａ ねじ溝
３ 円筒ころ
４ 保持器
４ａ ポケット
５ 保持器案内円筒部
１０ 溝面 DESCRIPTION OF SYMBOLS 1 Screw shaft 1a Thread groove 2 Nut 2a Thread groove 3 Cylindrical roller 4 Cage 4a Pocket 5 Cage guide cylindrical part 10 Groove surface

Claims (3)

螺旋状に連続する断面略Ｖ字状のねじ溝が外周面に形成されたねじ軸と、前記ねじ軸のねじ溝に対向する断面略Ｖ字状のねじ溝が内周面に形成されたナットと、前記両ねじ溝間に転動自在に介装された複数の円筒ころと、を備え、前記ねじ軸と前記ナットとの相対回転運動により、前記円筒ころの転動を介して、前記ねじ軸と前記ナットとが軸方向へ相対移動するようになっている円筒ころねじ装置において、
前記両ねじ溝間に前記円筒ころを転動自在に保持する略円筒形状の保持器が、前記ねじ軸と前記ナットとの間に介装されていて、前記円筒ころは前記保持器の所定位置に保持された状態で転動するようになっていることを特徴とする円筒ころねじ装置。 A screw shaft having a substantially V-shaped thread groove continuous in a spiral shape formed on the outer peripheral surface, and a nut having a substantially V-shaped screw groove facing the screw groove of the screw shaft formed on the inner peripheral surface And a plurality of cylindrical rollers interposed so as to be freely rollable between the two screw grooves, and the screw is rotated by rolling of the cylindrical rollers by a relative rotational movement of the screw shaft and the nut. In the cylindrical roller screw device in which the shaft and the nut are adapted to move relative to each other in the axial direction,
A substantially cylindrical cage that holds the cylindrical roller in a freely rollable manner between the screw grooves is interposed between the screw shaft and the nut, and the cylindrical roller is positioned at a predetermined position of the cage. A cylindrical roller screw device which is configured to roll while being held by the roller. 前記保持器は、かご形型式又はもみ抜き型式の保持器であることを特徴とする請求項１に記載の円筒ころねじ装置。   The cylindrical roller screw device according to claim 1, wherein the cage is a cage type or a machined type cage. 前記保持器は、耐摩耗性を向上させる硬質皮膜を有することを特徴とする請求項１又は請求項２に記載の円筒ころねじ装置。   The cylindrical roller screw device according to claim 1, wherein the cage has a hard coating that improves wear resistance.
JP2004016047A 2004-01-23 2004-01-23 Cylindrical roller screw device Withdrawn JP2005207527A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011514492A (en) * 2008-03-06 2011-05-06 ツェットエフ、フリードリッヒスハーフェン、アクチエンゲゼルシャフト Friction clutch device operating device and torque transmission device formed thereby
CN107714420A (en) * 2017-09-09 2018-02-23 邯郸学院 A kind of medical apparatus
CN109386581A (en) * 2018-12-09 2019-02-26 扬州海通电子科技有限公司 A kind of closely-pitched self-locking type gear hobbing lead screw

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011514492A (en) * 2008-03-06 2011-05-06 ツェットエフ、フリードリッヒスハーフェン、アクチエンゲゼルシャフト Friction clutch device operating device and torque transmission device formed thereby
CN107714420A (en) * 2017-09-09 2018-02-23 邯郸学院 A kind of medical apparatus
CN109386581A (en) * 2018-12-09 2019-02-26 扬州海通电子科技有限公司 A kind of closely-pitched self-locking type gear hobbing lead screw
CN109386581B (en) * 2018-12-09 2024-01-23 扬州海通电子科技有限公司 Self-locking type thread hobbing screw

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