JP2013245721A - Linear motion guide device - Google Patents

Linear motion guide device Download PDF

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JP2013245721A
JP2013245721A JP2012118483A JP2012118483A JP2013245721A JP 2013245721 A JP2013245721 A JP 2013245721A JP 2012118483 A JP2012118483 A JP 2012118483A JP 2012118483 A JP2012118483 A JP 2012118483A JP 2013245721 A JP2013245721 A JP 2013245721A
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rolling
guide rail
slider
inner sleeve
sleeve portion
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Hiroki Yamaguchi
宏樹 山口
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NSK Ltd
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NSK Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a linear motion guide device capable of striking a balance between the alignment performance (absorptivity of an installation error) and the security of load capacity determined by a rolling element and a rolling groove without the problem of member strength, with an inexpensive constitution.SOLUTION: Rolling grooves 11, 12, 211 and 212 formed on both sides in the width direction of a guide rail 1 and in respective sleeve parts 21 of a slider 2, are respectively formed in two rows, balls 3 are used as rolling elements, member rigidity of the sleeve part 21 of the slider 2 is made smaller than rigidity of ball contact parts in the rolling grooves 211 and 212 of the sleeve parts, and a thickness of a base part 22 of the slider 2 is set larger than a diameter of the ball 3. Both sleeve parts 21 of the slider are constituted of an inner sleeve part 21a integrally continued with the base part 22, constituting a portion on the guide rail side and forming the rolling grooves, and an outer sleeve part 21b formed as a separate body from this inner sleeve part 21a and installed outside in the width direction of the inner sleeve part 21a.

Description

本発明は、案内レールに跨架されるとともに、転動体を介して案内レールに沿ってスライド移動可能なスライダを備える直動案内装置に係る。   The present invention relates to a linear motion guide device that includes a slider that is laid over a guide rail and that is slidable along the guide rail via a rolling element.

この種の直動案内装置を使用する分野においては、直動案内装置を用いる装置のコンパクト化が進んでいる。その一方、直動案内装置に対して幅広い荷重条件への対応が求められ、高精度な取付面精度の確保が難しい中で大きな負荷荷重を受けての使用例が増えている。
そのような一般搬送装置のなかには、コストの制約等により直動案内装置用の取付け面の精度や組付精度が十分に確保されないまま直動案内装置が使用され、これにより、騒音発生や早期破損等が生じる場合がある。そこで、例えば特許文献1では、直動案内装置を構成する案内レールを、弾性変形する形状とした柔構造により前記精度の誤差を吸収する構造としている。同文献によれば、この柔構造によって直動案内装置の取付け誤差を吸収し得るとされる。
In the field where this type of linear motion guide device is used, downsizing of the device using the linear motion guide device is progressing. On the other hand, the linear motion guide device is required to cope with a wide range of load conditions, and there are increasing examples of use under a large load while it is difficult to ensure high accuracy of the mounting surface.
Among such general conveying devices, linear motion guide devices are used without sufficient accuracy and mounting accuracy for the linear motion guide devices due to cost constraints, etc., which can cause noise and early breakage. Etc. may occur. Therefore, in Patent Document 1, for example, the guide rail constituting the linear motion guide device has a structure that absorbs the accuracy error by a flexible structure that is elastically deformed. According to the document, this flexible structure can absorb the mounting error of the linear motion guide device.

特開2004−44770号公報JP 2004-44770 A 実公平6−20894号公報Japanese Utility Model Publication No. 6-20894

しかしながら、特許文献1記載の技術では、柔構造とした案内レールの強度確保については考慮されていない。そのため、柔構造とした案内レールに応力が集中すれば、大荷重作用時や繰返し荷重作用時に、柔構造部の強度不足によって転動体(ころ)の定格荷重よりも小さな負荷で早期破損となり、ころを使って高負荷容量とした効果が得られない可能性がある。   However, the technique described in Patent Document 1 does not consider securing the strength of the flexible guide rail. Therefore, if stress concentrates on the guide rail with flexible structure, it will cause early breakage at a load smaller than the rated load of the rolling element (roller) due to insufficient strength of the flexible structure part under heavy load action or repeated load action. It may not be possible to obtain the effect of using a high load capacity.

さらに、特許文献1記載の技術では、長尺な案内レールを異形形状の柔構造としたので、引抜等の生産性が悪化するためスライダー本体を異形形状とした場合に比べて製造コストが増大する。また、特許文献1の形状で案内レールを柔構造にすると従来の2倍の取付けボルトが必要になるため、コストアップになるとともに組立、走行の基準となる案内レールの真直度の確保が難しくなり取付け性が低下する。そのため、機台に組み付けたときに取付け誤差が大きくなるおそれがある。   Furthermore, in the technique described in Patent Document 1, since the long guide rail has an irregularly shaped flexible structure, productivity such as drawing is deteriorated, so that the manufacturing cost increases compared to the case where the slider body is irregularly shaped. . In addition, if the guide rail has a flexible structure in the shape of Patent Document 1, twice as many mounting bolts as before are required, which increases the cost and makes it difficult to ensure the straightness of the guide rail as a reference for assembly and travel. Mounting is reduced. Therefore, there is a possibility that the mounting error becomes large when assembled to the machine base.

また、特許文献2には案内レールを上向きのU字状に形成した例が記載されていて、その中にスライダが設置されて相対的に進退するようになっている。ここで、同文献2には前記剛性についての明文での説明は記載されていないものの、案内レール部材の肉厚がボールの直径以下の寸法の薄板であることが図示されており、ボールと転動溝との接触部剛性よりも案内レールの部材剛性のほうが小さいという点が読み取れる。   Further, Patent Document 2 describes an example in which a guide rail is formed in an upward U-shape, and a slider is installed in the guide rail so as to relatively advance and retreat. Here, although the literature 2 does not include a clear explanation about the rigidity, it is illustrated that the thickness of the guide rail member is a thin plate having a dimension equal to or smaller than the diameter of the ball. It can be read that the member rigidity of the guide rail is smaller than the rigidity of the contact portion with the moving groove.

しかしながら、特許文献2に記載の案内レールとスライダは薄板をプレス成形等で折り曲げで成形しているから軽量且つコンパクトである利点があり、コスト面でも有利であるが、その反面、部材強度の制約から、ボールと転動溝とで定まる負荷容量を大きく下回る軽荷重しか支持することができず、軽量テーブルのスライド部等、一部の搬送装置への使用に留まっている。   However, since the guide rail and the slider described in Patent Document 2 are formed by bending a thin plate by press molding or the like, there is an advantage that it is lightweight and compact, and it is advantageous in terms of cost. Therefore, only a light load that greatly falls below the load capacity determined by the ball and the rolling groove can be supported, and the use is limited to some conveying devices such as a slide portion of a lightweight table.

そこで、本発明は、このような問題点に着目してなされたものであって、案内レールを柔構造にする特許文献1の技術とは異なる技術によって、安価な構成としつつも、調芯性(取付け誤差の吸収性)と、部材強度の問題なく、転動体と転動溝とで定まる負荷容量の確保を両立させ、一般搬送装置に広く使用が可能な直動案内装置を提供することを目的としている。   Therefore, the present invention has been made paying attention to such a problem, and the alignment property can be reduced while using a technique different from the technique of Patent Document 1 in which the guide rail has a flexible structure. To provide a linear motion guide device that can be used widely in general conveying devices, ensuring both the load capacity determined by the rolling elements and the rolling groove without any problem of (attachment error absorption) and member strength. It is aimed.

この発明の第1の態様の直動案内装置は、案内レールとこれに跨架されたスライダとこれらの間に介在する複数個の転動体とで構成され、案内レールは、幅方向両側面に転動体の転動溝が形成され、スライダは、案内レールの幅方向両側に配置されて案内レール側の面に前記案内レールの転動溝に対向する転動溝が形成された2つの袖部と、案内レールの厚さ方向一端側に配置されて両袖部を連結する基部と、これらの直動方向両端に配置されるエンドキャップとからなり、転動体の循環を伴いながら案内レールおよびスライダの一方が他方に対して相対的に直動する直動案内装置において、前記案内レールの幅方向両側面及び前記各袖部に形成する転動溝は各2列をなし、且つ前記転動体としてボールを用いるものとし、前記スライダの袖部の部材剛性を、袖部の転動溝におけるボール接触部の剛性よりも小さくするとともに、前記基部の肉厚をボールの直径よりも大きく設定したことを特徴としている。   A linear motion guide device according to a first aspect of the present invention includes a guide rail, a slider straddled by the guide rail, and a plurality of rolling elements interposed therebetween, and the guide rail is formed on both side surfaces in the width direction. Rolling grooves of the rolling element are formed, and the slider is arranged on both sides in the width direction of the guide rail, and has two sleeve portions in which rolling grooves facing the rolling groove of the guide rail are formed on the surface of the guide rail. A guide rail and a slider with circulation of the rolling elements, and a base portion arranged at one end side in the thickness direction of the guide rail and connecting both sleeve portions and end caps arranged at both ends of the linear motion direction. In the linear motion guide device in which one of the linear motions moves linearly relative to the other, the rolling grooves formed on both side surfaces in the width direction of the guide rail and the respective sleeve portions form two rows, respectively, and serve as the rolling elements. Balls shall be used and the sleeve of the slider The member stiffness, as well as smaller than the rigidity of the ball contact portion of the rolling groove of the sleeve portion, and characterized in that the thickness of the base portion is set larger than the diameter of the ball.

また、第2の態様の直動案内装置は、前記第1の態様において、前記案内レールとスライダの各転動溝の断面形状をゴシックアーク形状としたことを特徴としている。
さらに、第3の態様の直動案内装置は、前記第1又は第2の態様において、前記スライダの両袖部は、前記基部に連続して一体をなして前記案内レール側の部分を構成し前記転動溝が形成された内袖部と、この内袖部とは別体をなして内袖部の幅方向外側に装着された外袖部とからなることを特徴としている。
さらに、第4の態様の直動案内装置は、前記第3の態様において、前記案内レール側面の2列の転動溝と、これに対向して形成された内袖部の2列の転動溝とにより構成された転動通路に連続する少なくとも1列の戻し通路を、前記外袖部に形成したことを特徴としている。
Further, the linear motion guide device of the second aspect is characterized in that, in the first aspect, the cross-sectional shape of each rolling groove of the guide rail and the slider is a Gothic arc shape.
Further, in the linear motion guide device according to the third aspect, in the first or second aspect, both sleeve portions of the slider are continuously integrated with the base portion to constitute a portion on the guide rail side. It is characterized by comprising an inner sleeve portion in which the rolling groove is formed and an outer sleeve portion which is separated from the inner sleeve portion and is mounted on the outer side in the width direction of the inner sleeve portion.
Furthermore, the linear motion guide device according to the fourth aspect is the same as that according to the third aspect, in which the two rows of rolling grooves on the side surface of the guide rail and the two rows of rolling of the inner sleeve portion formed to face the rolling grooves. The outer sleeve portion is formed with at least one line of return passages that are continuous with the rolling passage formed by the grooves.

この発明によれば、前記基部と前記袖部とからなる断面略逆U字形状のスライダにおける前記袖部の肉厚を可及的に小さくしており、ボールと転動溝との接触部剛性よりも両袖部の部材剛性の方を小さくしている。また、基部の肉厚はボール径より大きくなっている。このため、取付誤差は、低剛性とした袖部の部材変形で多くを吸収することができ、従来品よりも大きな調芯性(特に横方向(案内レールの幅方向)に対して)を持つことになる。一方で、肉を削った両袖部は、大荷重が作用した際の一発破壊や塑性変形あるいは繰り返し疲労による破損の防止に留意した断面形状と肉厚となっており、さらに基部はボール径より大きい厚みを持つことから、ボールと転動溝とで定まる負荷容量を制約することがない。さらに2点接触とすることで通常使用状態では低摩擦力となり、各転動溝をゴシックアーク溝とすることで通常は2溝で負荷を受けるが大荷重作用時には4溝で負荷を受けることができ、一層、高負荷容量となる。   According to the present invention, the thickness of the sleeve portion of the slider having a substantially inverted U-shaped cross section composed of the base portion and the sleeve portion is made as small as possible, and the rigidity of the contact portion between the ball and the rolling groove is reduced. The member rigidity of both sleeves is made smaller than that. The thickness of the base is larger than the ball diameter. For this reason, mounting errors can be absorbed much by the deformation of the sleeve part with low rigidity, and the alignment is greater than that of conventional products (especially in the lateral direction (width direction of the guide rail)). It will be. On the other hand, both sleeves that have been shaved have a cross-sectional shape and wall thickness that take into account the prevention of one-time failure, plastic deformation, or damage due to repeated fatigue when a large load is applied, and the base has a ball diameter Since it has a larger thickness, the load capacity determined by the ball and the rolling groove is not restricted. Furthermore, by using two-point contact, the friction force is low in normal use, and by making each rolling groove a gothic arc groove, a load is normally received by two grooves, but a load is received by four grooves when a large load is applied. It can be further increased in load capacity.

特に第3の態様においては、スライダの袖部を、スライダの基部に連続して一体をなして案内レール側の部分を構成する内袖部と、この内袖部とは別体をなして内袖部の幅方向外側に装着された外袖部とから構成している。このため、外袖部にはボール転動溝を有する内袖部ほどに高い剛性と強度を求められないから、外袖部を、内袖部をなす鋼材よりも安価な合成樹脂や軽金属により形成することができる。その結果、外袖部の材料や加工のコストが低くなるので、直動案内装置全体のコストを低減することができるとともに、移動部となるスライダの軽量化もはかれる。ここで、異形となる袖部の欠肉部である外袖部を、引抜が可能となる外形形状とすることで、大幅なコストアップを避けることができる。   In particular, in the third aspect, the sleeve portion of the slider is connected to the base portion of the slider so as to be integrated with the inner sleeve portion constituting the guide rail side portion, and the inner sleeve portion is separated from the inner sleeve portion. The outer sleeve portion is mounted on the outer side in the width direction of the sleeve portion. For this reason, the outer sleeve is not required to be as rigid and strong as the inner sleeve with the ball rolling groove, so the outer sleeve is formed of a synthetic resin or light metal that is less expensive than the steel material forming the inner sleeve. can do. As a result, the material of the outer sleeve portion and the processing cost are reduced, so that the cost of the entire linear guide device can be reduced, and the weight of the slider serving as the moving portion can be reduced. Here, a significant increase in cost can be avoided by forming the outer sleeve portion, which is a lacking portion of the sleeve portion, which has an irregular shape, into an outer shape that can be pulled out.

(a)は第1の実施形態を示す断面図。(b)は(a)のスライダにおける基部と内袖部とを示す断面図。(A) is sectional drawing which shows 1st Embodiment. (B) is sectional drawing which shows the base and inner sleeve part in the slider of (a). 第1の実施形態における内袖部と外袖部との関係を説明する分解斜視図。The disassembled perspective view explaining the relationship between the inner sleeve part and outer sleeve part in 1st Embodiment. 第2の実施形態を示す断面図。Sectional drawing which shows 2nd Embodiment. 第3の実施形態を示す断面図。Sectional drawing which shows 3rd Embodiment. 第4の実施形態を示す断面図。Sectional drawing which shows 4th Embodiment.

図1、2は本発明の第1の実施形態の直動案内装置を示す図である。この直動案内装置は、案内レール1と、これに跨架されたスライダ2と、これらの間に介在する複数個のボール3とで構成されている。案内レール1は材料が鋼からなり、横断面が大体において四角形をなし、その幅方向、つまりこの実施形態では左右の両側面にボール3の転動溝11、12が各2列長手方向に延びて形成されている。スライダ2は、案内レール1の幅方向、つまり同じく左右の両側に配置された袖部21と、案内レール1の厚さ方向一端側(図1では案内レールの上端側)に配置されて両袖部21を連結する基部22と、これらの直動方向、つまり案内レールの長手方向の両端に配置されるエンドキャップ23とからなる。袖部21には、案内レール1側の面に前記案内レール1の転動溝11、12に対向する各2列の転動溝211、212が形成され、これら対向する転動溝11、211によりボール3の転動路31が形成され、また同転動溝12、212により、ボール3の転動路32が構成されている。   1 and 2 are views showing a linear guide apparatus according to a first embodiment of the present invention. This linear motion guide device includes a guide rail 1, a slider 2 straddling the guide rail 1, and a plurality of balls 3 interposed therebetween. The guide rail 1 is made of steel and has a substantially rectangular cross section. In this embodiment, the rolling grooves 11 and 12 of the balls 3 extend in the longitudinal direction of each two rows on the left and right sides in this embodiment. Is formed. The slider 2 is disposed on the width direction of the guide rail 1, that is, on both sides of the left and right sides, and on one end side in the thickness direction of the guide rail 1 (the upper end side of the guide rail in FIG. 1). The base part 22 which connects the part 21 and the end cap 23 arrange | positioned at these linear motion directions, ie, the both ends of the longitudinal direction of a guide rail, are comprised. In the sleeve portion 21, two rows of rolling grooves 211, 212 facing the rolling grooves 11, 12 of the guide rail 1 are formed on the surface of the guide rail 1, and these facing rolling grooves 11, 211 are formed. Thus, a rolling path 31 of the ball 3 is formed, and the rolling grooves 12 and 212 form a rolling path 32 of the ball 3.

スライダ2の両袖部21は、内袖部21aと外袖部21bとからなる。内袖部21aは、前記基部22に連続して一体をなしており、袖部21の前記案内レール1側の部分を構成し、また前記2列の転動溝211、212が形成されている。また外袖部21bは、前記内袖部21aとは別体をなして内袖部21aの幅方向外側に装着されている。基部22と内袖部21aは鋼からなり、この実施形態では概略で下向きの断面U字状をなし、また外袖部21bは合成樹脂からなる。   Both sleeve portions 21 of the slider 2 include an inner sleeve portion 21a and an outer sleeve portion 21b. The inner sleeve portion 21a is continuously integrated with the base portion 22, constitutes a portion of the sleeve portion 21 on the guide rail 1 side, and the two rows of rolling grooves 211 and 212 are formed. . The outer sleeve portion 21b is mounted on the outer side in the width direction of the inner sleeve portion 21a so as to be separate from the inner sleeve portion 21a. The base portion 22 and the inner sleeve portion 21a are made of steel. In this embodiment, the base portion 22 and the inner sleeve portion 21a have a generally downward U-shaped cross section, and the outer sleeve portion 21b is made of synthetic resin.

この実施形態における左右の外袖部21bは、図2に示す基部22の直動方向の両端に位置する前後の連結部24により一体化されており、これら両外袖部21bと両連結部22とが、この実施形態においては平面四角形をなす合成樹脂製の枠をなしている。この枠をなす両外袖部21bと両連結部22とが、基部22と内袖部21aとに四周から嵌合することにより、外袖部21bが内袖部21aの外側に装着されている。また、相対的に嵌合状態にある両者間は、平面四角形の枠をなしている両外袖部21bと両連結部22とが形成される合成樹脂の嵌合時の弾性変形による復元力により、特に外袖部21bが内袖部21aの外面に圧接してその摩擦力により相対位置が維持されている。しかし、ビスその他の固着手段を加えて着脱可能に固着することも可能である。   The left and right outer sleeve portions 21b in this embodiment are integrated by front and rear connecting portions 24 positioned at both ends of the base portion 22 in the linear movement direction shown in FIG. 2, and both the outer sleeve portions 21b and the both connecting portions 22 are integrated. However, in this embodiment, a frame made of a synthetic resin having a planar quadrangle is formed. The outer sleeve portion 21b and the connecting portion 22 forming the frame are fitted to the base portion 22 and the inner sleeve portion 21a from four sides, so that the outer sleeve portion 21b is mounted on the outer side of the inner sleeve portion 21a. . In addition, between the two in the relatively fitted state, due to the restoring force due to the elastic deformation at the time of fitting of the synthetic resin in which both the outer sleeve portions 21b and the two connecting portions 22 forming a flat rectangular frame are formed. In particular, the outer sleeve portion 21b is pressed against the outer surface of the inner sleeve portion 21a, and the relative position is maintained by the frictional force. However, it is possible to detachably fix by adding screws or other fixing means.

なお、図2は外袖部21bを内袖部21aの外側に装着させるための構造の一例を説明し、またこれらとエンドキャップ23との位置関係を説明するための概略図である。したがって、ボールの転動溝や方向転換路などの各部の構造について正確に表現するものではない。
前記したスライダ2の内袖部21aは、図1に示すように、その肉厚を、ボール3と転動溝211、212との接触部の剛性よりも内袖部21aの部材の剛性が小さくなるように、外側面の側の肉を削り落とすことによって薄肉にしている。この薄肉化の結果としてボール3の戻り通路を形成する場所を補うのが前記外袖部21bということになる。
FIG. 2 is a schematic diagram for explaining an example of a structure for attaching the outer sleeve portion 21b to the outer side of the inner sleeve portion 21a, and for explaining the positional relationship between these and the end cap 23. Therefore, it does not accurately represent the structure of each part such as a ball rolling groove and a direction changing path.
As shown in FIG. 1, the inner sleeve portion 21a of the slider 2 has a thickness that is smaller than the rigidity of the contact portion between the ball 3 and the rolling grooves 211 and 212. In order to achieve this, the meat on the outer surface side is thinned by scraping off. As a result of this thinning, the outer sleeve portion 21b supplements the place where the return path of the ball 3 is formed.

本実施形態では、前記転動溝11、211からなる転動路31の戻り通路33が基部22と内袖部21aとの中間に形成され、また前記転動溝12、212からなる転動路32の戻り通路34が合成樹脂からなる外袖部21bに形成されている。戻り通路34を鋼である基部22と内袖部21aに形成せずに、合成樹脂である外袖部21bに形成したから、穴加工のコストが緩和される。   In this embodiment, the return path 33 of the rolling path 31 composed of the rolling grooves 11 and 211 is formed in the middle of the base portion 22 and the inner sleeve portion 21a, and the rolling path composed of the rolling grooves 12 and 212. 32 return passages 34 are formed in the outer sleeve portion 21b made of synthetic resin. Since the return passage 34 is not formed in the base portion 22 and the inner sleeve portion 21a that are made of steel, but is formed in the outer sleeve portion 21b that is a synthetic resin, the cost of drilling is reduced.

また、本実施形態では、図1に示すスライダ2の横断面形状において、荷重負荷時のスライダ2の左右の内袖部21aの弾性変形量Ds(同図(b)に一点鎖線のイメージで示す)は、ボール3と転動溝211、212との接触部での弾性変形量Dt(同図に破線のイメージで示す)の約2倍(FEM解析に基づく結果より)としている。このとき、内袖部21aの、両転動溝211、212の間における肉厚Kはボール3直径の1.3〜1.7倍の範囲(好適には1.5倍)に設定している。   Further, in the present embodiment, in the cross-sectional shape of the slider 2 shown in FIG. 1, the elastic deformation amount Ds of the left and right inner sleeve portions 21a of the slider 2 when a load is applied (shown by a dashed line image in FIG. 1B). ) Is approximately twice the amount of elastic deformation Dt (shown by a broken line image in the figure) at the contact portion between the ball 3 and the rolling grooves 211 and 212 (from the result based on the FEM analysis). At this time, the wall thickness K between the rolling grooves 211 and 212 of the inner sleeve portion 21a is set to a range of 1.3 to 1.7 times the ball 3 diameter (preferably 1.5 times). Yes.

またスライダ2の内袖部21aの最薄肉部Sや上側の転動溝211部分や戻り通路33周辺部での最薄肉部S’に極端な応力が集中しないように、内袖部21aの肉厚や戻り通路33の位置を定めている。このため、取付誤差は、低剛性とした内袖部21aの部材変形で吸収でき、大荷重作用時であっても内袖部21aの各部に極端な応力集中を生じることなく負荷を受けることができ、一発破壊や塑性変形、繰り返し疲労による破損に対して有利となる。   Further, the inner sleeve 21a has a thickness so that extreme stress does not concentrate on the thinnest portion S of the inner sleeve 21a of the slider 2, the upper rolling groove 211, and the thinnest portion S 'around the return passage 33. The thickness and the position of the return passage 33 are determined. For this reason, the mounting error can be absorbed by deformation of the inner sleeve portion 21a having low rigidity, and even when a large load is applied, the load can be received without causing extreme stress concentration in each portion of the inner sleeve portion 21a. This is advantageous for one-time fracture, plastic deformation, and damage due to repeated fatigue.

よって、本実施形態の直動案内装置は調芯性を持つとともに、低剛性とした部材部の強度確保のため負荷容量の制約を受けることなく高負荷容量を維持することが可能である。ここで、内袖部21aの肉厚を薄くすればするほど部材剛性が低下し、取付誤差吸収等の調芯性は増すが、一方で荷重負荷時の応力が増し部材の強度が低下する。強度低下が著しいとボールと転動溝とで定まる負荷容量以下で使用する必要が生じ、部材強度の制約から本来の負荷容量を生かすことができなくなる。そこで、本実施形態では、内袖部21aの前記肉厚Kは前記のようにボール3直径の1.3〜1.7倍の範囲(好適には1.5倍)に設定しており、調芯性と負荷容量確保の両立をはかっている。   Therefore, the linear motion guide device of the present embodiment has a centering property and can maintain a high load capacity without being restricted by the load capacity in order to ensure the strength of the low rigidity member. Here, the thinner the inner sleeve portion 21a is, the lower the rigidity of the member is and the alignment property such as attachment error absorption is increased. On the other hand, the stress at the time of loading is increased and the strength of the member is reduced. If the strength is significantly reduced, it becomes necessary to use the load below the load capacity determined by the ball and the rolling groove, and the original load capacity cannot be utilized due to the restriction of the member strength. Therefore, in the present embodiment, the thickness K of the inner sleeve portion 21a is set in the range of 1.3 to 1.7 times (preferably 1.5 times) the diameter of the ball 3 as described above. Both alignment and load capacity are ensured.

また、下側の転動溝212の戻り通路34は、内袖部21aの外側に配置した別部材の樹脂体からなる外袖部21bに設けたため、その分の戻り通路の加工が鋼からなる内袖部21aにおいては不要になったから低コストになる。
さらに、本実施形態では、前記転動路31、32におけるボール3の接触構造をDB接触構造(各内袖部21aの2列の転動路31、32を転動するボール3列の荷重作用線の交点が、案内レール1の中心から見て、転動路31、32よりも幅方向で外側に存在している構造)としている。このため、部材変形する内袖部21aの中央部分に転動溝211、212とボール3の接触位置を定めることができるから、DF接触構造(各内袖部21aの2列の転動路31、32を転動するボール3列の荷重作用線の交点が、案内レール1の中心から見て、転動路31、32よりも幅方向で内側に存在している構造)とした場合に比して部材変形を効果的に利用できるし、部材の強度面でも有利になっている。
Further, since the return passage 34 of the lower rolling groove 212 is provided in the outer sleeve portion 21b made of a resin body, which is a separate member, disposed outside the inner sleeve portion 21a, the processing of the return passage is made of steel. The inner sleeve portion 21a is no longer necessary, so the cost is reduced.
Furthermore, in this embodiment, the contact structure of the balls 3 in the rolling paths 31 and 32 is a DB contact structure (the load action of the three rows of balls rolling on the two rolling paths 31 and 32 of each inner sleeve portion 21a). The structure is such that the intersection of the lines exists outside the rolling paths 31 and 32 in the width direction as viewed from the center of the guide rail 1). For this reason, since the contact position of the rolling grooves 211 and 212 and the ball 3 can be determined in the central portion of the inner sleeve portion 21a to be deformed, the DF contact structure (the two rows of rolling paths 31 of each inner sleeve portion 21a). , 32, the intersection of the load action lines of the three rows of balls rolling is a structure in which the intersection exists in the width direction with respect to the rolling paths 31 and 32 when viewed from the center of the guide rail 1). Thus, the member deformation can be used effectively, and the strength of the member is also advantageous.

また、各転動溝11、12、211、212はゴシックアーク溝になっていて、通常の圧縮荷重は荷重方向に応じた2つの転動路32、32(いずれも転動溝12、212からなる)で負荷を受けるが、大荷重のときには荷重を受けて変位する他の2つの転動路31、31(いずれも転動溝11、211からなる)も加わり、合計4つの転動路31、31、32、32により負荷を受けることができるから、さらに高負荷容量になる。なお、ここでは、通常荷重とは、動定格荷重の20%以下の荷重をいい、前記20%超のときを大荷重と称した。さらに、前記のようにゴシックアーク溝で且つDB接触構造としてボールと転動溝を2点接触にしたため、通常時はボール3転動時の摩擦抵抗が低く、モータ等の駆動系の負担を低く抑えることができる。   Each of the rolling grooves 11, 12, 211, 212 is a Gothic arc groove, and a normal compressive load is applied to two rolling paths 32, 32 (both from the rolling grooves 12, 212) according to the load direction. The two other rolling paths 31 and 31 (both consisting of rolling grooves 11 and 211) that are displaced by receiving a load when a heavy load is added are added, for a total of four rolling paths 31. , 31, 32, 32, the load capacity can be further increased. Here, the normal load refers to a load that is 20% or less of the dynamic load rating, and a load exceeding 20% is referred to as a large load. Furthermore, since the ball and the rolling groove are in a two-point contact as a DB contact structure as described above with a Gothic arc groove, the frictional resistance during the rolling of the ball 3 is normally low, and the load on the drive system such as a motor is low. Can be suppressed.

また、転動体としてボール3を採用したため、案内レール1の転動溝11、12及び内袖部21aの転動溝211、212も、断面がゴシックアーク形状その他の円弧状をなすことになる。この点につき、転動体としてころを採用した場合と比較して考察すると次のようになる。つまりころの場合には前記溝の断面が三角形になって、その溝底が角状になるから、これが前記内袖部21aに形成されると、内袖部21aの前記角状の溝底に応力が集中することになって内袖部21aの部材強度を低下させるおそれがある。しかし、この実施形態では前記転動溝211、212の断面は円弧状をなすから、前記の応力集中は抑制されることになり、部材強度の面で有利となる。   Further, since the balls 3 are adopted as the rolling elements, the rolling grooves 11 and 12 of the guide rail 1 and the rolling grooves 211 and 212 of the inner sleeve portion 21a also have a Gothic arc shape or other arc shape in cross section. Considering this point in comparison with the case where rollers are used as rolling elements, the following is obtained. In other words, in the case of a roller, the groove has a triangular cross section, and the groove bottom has a square shape. Therefore, when this is formed on the inner sleeve portion 21a, the groove has a rectangular groove bottom on the inner sleeve portion 21a. There is a possibility that stress is concentrated and the strength of the member of the inner sleeve portion 21a is lowered. However, in this embodiment, since the rolling grooves 211 and 212 have a circular cross section, the stress concentration is suppressed, which is advantageous in terms of member strength.

図3は第2の実施形態を示す図であり、これは前記第1の実施形態に対して、この第2の実施形態ではボール3の接触をDF接触構造にした点と、案内レール1の上側の転動溝11の上フランクをなくした点と、戻り通路33の位置が基部22側に変更された点が相違している。
この第2の実施形態では前記のようにDF接触構造にしたため、DB接触構造の前記第1の実施形態に比してローリング方向の調芯性は大きく向上するが、横方向の調芯性は低下する。本発明のように、スライダ2の袖部21の部材変形で調芯性を向上させた場合には、変形する梁(すなわちスライダ2の袖部21)の根元と端部(つまり長手方向両端部分)に接触位置をもつDF接触構造よりも、梁の中央部に接触位置をもつDB接触のほうが、より効果的に調芯性を引き出すことができるので有利である。一方、案内レール1を2本平行に組み付けて、それぞれに跨架されたスライダ2にテーブルを架設する形態で使用するのではなく、コストダウン等のために案内レール1を1本で使用する直動案内構造とした場合にはスライダ2が倒れやすい形態になるために、これに対抗してローリング方向の調芯性に優れる本実施形態のDF接触構造としたほうが有利である。
FIG. 3 is a diagram showing a second embodiment, which is different from the first embodiment in that the contact of the ball 3 is a DF contact structure in the second embodiment, and the guide rail 1 The difference is that the upper flank of the upper rolling groove 11 is eliminated and the position of the return passage 33 is changed to the base 22 side.
In the second embodiment, since the DF contact structure is used as described above, the alignment property in the rolling direction is greatly improved as compared with the first embodiment of the DB contact structure, but the alignment property in the lateral direction is descend. When the alignment is improved by deforming the sleeve 21 of the slider 2 as in the present invention, the root and end of the deformed beam (that is, the sleeve 21 of the slider 2) (that is, both end portions in the longitudinal direction). The DB contact having the contact position in the center of the beam is more advantageous than the DF contact structure having the contact position in FIG. On the other hand, instead of using two guide rails 1 mounted in parallel and laying a table on a slider 2 straddled on each of them, a single guide rail 1 is used for cost reduction. When the moving guide structure is adopted, the slider 2 is likely to fall down. Therefore, the DF contact structure according to the present embodiment, which is excellent in alignment in the rolling direction, is advantageous.

また、この第2の実施形態では、レール1の上側の転動溝11の上フランクをなくしたことで、大荷重作用時の引っ張り及び横方向の負荷容量は低下するものの、戻り通路33の位置の自由度が増加する。この実施形態ではスペースに余裕のある基部22の中央寄りに位置させたので、戻り通路33周辺部での薄肉化を回避することにより、生産性に対して有利となっている。他の構成と作用については第1の実施形態と同様である。   In the second embodiment, the upper flank of the rolling groove 11 on the upper side of the rail 1 is eliminated, so that the tensile force and the lateral load capacity during a large load action are reduced, but the position of the return passage 33 is reduced. The degree of freedom increases. In this embodiment, since it is located closer to the center of the base portion 22 with sufficient space, avoiding thinning in the periphery of the return passage 33 is advantageous for productivity. Other configurations and operations are the same as those in the first embodiment.

図4は第3の実施形態を示す図であり、これは前記第1の実施形態に対して、この第3の実施形態では案内レール1の転動溝11、12をサーキュラアーク溝とした点が相違している。このような構造としたため第1の実施形態に比して大荷重時の負荷容量は低下(すなわち圧縮力、引張力、横力に対抗する力は低下)するが、案内レール1に加工している保持器用の溝(図1(a)において符号13で示される)を省略することができる。また案内レール1の左右にある上下一対の転動溝11、12におけるボール3の保持器を一体とすることができるから、これにより部品点数を減らすことができて、直動案内装置の生産性向上とコスト低減に役立つ。他の構成と作用は第1の実施形態と同様である。   FIG. 4 is a diagram showing a third embodiment, which is different from the first embodiment in that the rolling grooves 11 and 12 of the guide rail 1 are circular arc grooves in the third embodiment. Is different. Due to such a structure, the load capacity at the time of a large load is reduced as compared to the first embodiment (that is, the force against the compression force, tensile force, and lateral force is reduced). The cage groove (indicated by reference numeral 13 in FIG. 1A) can be omitted. Further, since the cages of the balls 3 in the pair of upper and lower rolling grooves 11 and 12 on the left and right of the guide rail 1 can be integrated, this can reduce the number of parts and increase the productivity of the linear motion guide device. Helps improve and reduce costs. Other configurations and operations are the same as those of the first embodiment.

図5は第4の実施形態を示す図であり、これは前記第1の実施形態に対して、この第4の実施形態では、戻り通路33も他方の戻り通路34と同様に外袖部21bに形成した点が相違している。このようにしたため、鋼でできている基部22と内袖部21aへの穴加工がその分だけ不要になるから、この点でも直動案内装置の生産性向上とコスト低減に貢献することができる。前記第1の実施形態では、転動路と戻り通路を繋ぐ循環R部の内側案内部材(リターンガイド)を上の転動路31と下の転動路32の循環路で共通使用するため、転動路と戻り通路との距離が同一となるように内袖部21a側に設けたが、この実施形態では上下の通路を繋ぐ一体形状の内側案内部材(リターンガイド)を使用しており、その点でも第1の実施形態よりも生産性及びコストの面で有利となっている。この実施形態でも他の構成と作用は第1の実施形態と同様である。   FIG. 5 is a view showing the fourth embodiment, which is different from the first embodiment in that in the fourth embodiment, the return passage 33 is also the outer sleeve portion 21b in the same manner as the other return passage 34. The points formed are different. Since it did in this way, since the hole processing to the base 22 and the inner sleeve part 21a which are made from steel becomes unnecessary, it can contribute to the productivity improvement and cost reduction of a linear motion guide apparatus also in this point. . In the first embodiment, the inner guide member (return guide) of the circulation R section that connects the rolling path and the return path is commonly used in the circulating path of the upper rolling path 31 and the lower rolling path 32. Although provided on the inner sleeve portion 21a side so that the distance between the rolling path and the return path is the same, in this embodiment, an integral inner guide member (return guide) that connects the upper and lower paths is used. In this respect as well, it is more advantageous in terms of productivity and cost than the first embodiment. In this embodiment, other configurations and operations are the same as those in the first embodiment.

以上、各実施形態に基づいて本発明を説明したが、本発明では案内レールとスライダの部材強度が不足することなく、調芯性すなわち取付誤差吸収性の確保と、部材強度の問題なく、転動体と転動溝とで定まる負荷容量の確保が両立し且つ安価な直動案内装置を得ることができる。したがって請求項に記載された発明の範囲において仕様の形態を変更することができるもので、各実施形態の仕様に限定されるものではない。スライダの袖部の部材強度を確保しつつ同袖部の剛性を小さくすることが重要である。   As described above, the present invention has been described based on each embodiment. However, the present invention does not have insufficient member strength of the guide rail and the slider, ensures alignment, that is, secures mounting error absorption, and does not have a problem of member strength. It is possible to obtain an inexpensive linear motion guide device that is compatible with securing the load capacity determined by the moving body and the rolling groove. Therefore, the form of the specification can be changed within the scope of the invention described in the claims, and is not limited to the specification of each embodiment. It is important to reduce the rigidity of the sleeve portion while securing the strength of the sleeve portion of the slider.

1 案内レール
11、12 転動溝
2 スライダ
21 袖部
21a 内袖部
21b 外袖部
211、212 転動溝
22 基部
3 ボール
31、32 転動路
33、34 戻り通路
DESCRIPTION OF SYMBOLS 1 Guide rail 11, 12 Rolling groove 2 Slider 21 Sleeve part 21a Inner sleeve part 21b Outer sleeve part 211, 212 Rolling groove 22 Base part 3 Ball 31, 32 Rolling path 33, 34 Return path

Claims (4)

案内レールとこれに跨架されたスライダとこれらの間に介在する複数個の転動体とで構成され、案内レールは、幅方向両側面に転動体の転動溝が形成され、スライダは、案内レールの幅方向両側に配置されて案内レール側の面に前記案内レールの転動溝に対向する転動溝が形成された2つの袖部と、案内レールの厚さ方向一端側に配置されて両袖部を連結する基部と、これらの直動方向両端に配置されるエンドキャップとからなり、転動体の循環を伴いながら案内レールおよびスライダの一方が他方に対して相対的に直動する直動案内装置において、
前記案内レールの幅方向両側面及び前記各袖部に形成する転動溝は各2列をなし、且つ前記転動体としてボールを用いるものとし、前記スライダの袖部の部材剛性を、袖部の転動溝におけるボール接触部の剛性よりも小さくするとともに、前記基部の肉厚をボールの直径よりも大きく設定したことを特徴とする直動案内装置。
It consists of a guide rail, a slider straddled by this, and a plurality of rolling elements interposed between them. The guide rail has rolling grooves on both sides in the width direction, and the slider is a guide. Two sleeves arranged on both sides of the rail in the width direction and formed with rolling grooves facing the rolling grooves of the guide rail on the surface of the guide rail, and arranged on one end in the thickness direction of the guide rail It consists of a base part that connects both sleeve parts and end caps that are arranged at both ends of these linear movement directions. One of the guide rail and the slider linearly moves relative to the other while circulating the rolling elements. In the motion guide device,
The rolling grooves formed on both side surfaces of the guide rail in the width direction and the respective sleeve portions are each in two rows, and balls are used as the rolling elements, and the member rigidity of the sleeve portion of the slider is determined by A linear guide device characterized in that it is smaller than the rigidity of the ball contact portion in the rolling groove and the thickness of the base portion is set larger than the diameter of the ball.
前記案内レールとスライダの各転動溝の断面形状をゴシックアーク形状としたことを特徴とする請求項1に記載の直動案内装置。   2. The linear motion guide device according to claim 1, wherein a cross-sectional shape of each rolling groove of the guide rail and the slider is a Gothic arc shape. 前記スライダの両袖部は、前記基部に連続して一体をなして前記案内レール側の部分を構成し前記転動溝が形成された内袖部と、この内袖部とは別体をなして内袖部の幅方向外側に装着された外袖部とからなることを特徴とする請求項1又は2に記載の直動案内装置。   The sleeves of the slider are formed as a separate piece from the inner sleeve part, which is formed integrally with the base part to form a part on the guide rail side and the rolling groove is formed. The linear motion guide device according to claim 1, further comprising an outer sleeve portion mounted on the outer side in the width direction of the inner sleeve portion. 前記案内レール側面の2列の転動溝と、これに対向して形成された内袖部の2列の転動溝とにより構成された転動通路に連続する少なくとも1列の戻し通路を、前記外袖部に形成したことを特徴とする請求項3に記載の直動案内装置。   At least one return passage continuing to the rolling passage formed by two rows of rolling grooves on the side surface of the guide rail and two rows of rolling grooves of the inner sleeve formed opposite to the rolling grooves, The linear guide device according to claim 3, wherein the linear guide device is formed on the outer sleeve portion.
JP2012118483A 2012-05-24 2012-05-24 Linear motion guide device Pending JP2013245721A (en)

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WO2015178382A1 (en) * 2014-05-21 2015-11-26 Thk株式会社 Rolling guidance device

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