JP2867386B2 - Feed screw support device - Google Patents
Feed screw support deviceInfo
- Publication number
- JP2867386B2 JP2867386B2 JP63217748A JP21774888A JP2867386B2 JP 2867386 B2 JP2867386 B2 JP 2867386B2 JP 63217748 A JP63217748 A JP 63217748A JP 21774888 A JP21774888 A JP 21774888A JP 2867386 B2 JP2867386 B2 JP 2867386B2
- Authority
- JP
- Japan
- Prior art keywords
- nut
- screw shaft
- support
- intermediate support
- feed screw
- 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.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
- B23Q5/22—Feeding members carrying tools or work
- B23Q5/34—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission
- B23Q5/38—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously
- B23Q5/40—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously by feed shaft, e.g. lead screw
- B23Q5/404—Screw bearings therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
- F16H2025/2436—Intermediate screw supports for reducing unsupported length of screw shaft
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、送りねじの支持間距離（スパン）が長い場
合、送りねじの危険速度が低い回転数域となることによ
る送りねじの共振を回避するため、送りねじ軸の中間部
を補助的に支持する送りねじ支持装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a technique for reducing the resonance of a feed screw caused by the fact that the critical speed of the feed screw is in a low rotation speed range when the distance between supports of the feed screw is long. In order to avoid this, the present invention relates to a feed screw support device for supporting an intermediate portion of a feed screw shaft.
送りねじのねじ軸の回転による振動がねじ軸の固有振
動数と共振すると危険である。この危険速度はねじ軸の
支持スパンの２乗に反比例する。NC制御の平面研削盤な
どのようにテーブルストロークが長い場合には、ねじ軸
が長くなり、ねじ軸の支持スパンが長くなるので危険速
度が低くなる。送り速度の高速化に伴い送りねじの回転
数が上がり、危険速度領域で使用しなければならない場
合があり、このような場合は中間サポートを設けて支持
スパンを短くし、ねじ軸の固有振動数を高くする手段が
知られている。It is dangerous that the vibration caused by the rotation of the screw shaft of the feed screw resonates with the natural frequency of the screw shaft. This critical speed is inversely proportional to the square of the support span of the screw shaft. When the table stroke is long, such as in an NC-controlled surface grinder, the screw shaft becomes long and the supporting span of the screw shaft becomes long, so that the critical speed becomes low. As the feed speed increases, the number of revolutions of the feed screw increases, and it may be necessary to use it in a critical speed range.In such a case, an intermediate support is provided to shorten the support span, and the natural frequency of the screw shaft is increased. Means for increasing the pressure are known.
従来のこの種の手段としては、例えば特開昭58−1092
42号公報に示されるものがある（以下、単に従来例とい
う）。このものは、第５図に模式的に示すように、送り
ねじのねじ軸１の両端部を支える軸受SA,SBの間に、送
り方向に移動自在で２個の送りねじ支持部A,Bを持つ中
間サポートＳを設け、送りねじの回転によって移動する
ナット２を前記２個の送りねじ支持部A,Bの間に位置せ
しめ、ナット２の移動を妨けないよう前記中間サポート
Ｓがナット２の移動距離より短い距離をナット２に係か
り合って移動するうようにしたものである。Conventional means of this type include, for example, JP-A-58-1092.
No. 42 (hereinafter simply referred to as a conventional example). This material, as schematically shown in Figure 5, bearing S A supporting both end portions of the screw shaft 1 of the feed screw, between the S B, 2 pieces of the feed screw supporting portion A movable in feeding direction , B, the intermediate support S is provided so that the nut 2 which is moved by the rotation of the feed screw is positioned between the two feed screw supports A, B so that the movement of the nut 2 is not hindered. Are adapted to move in relation to the nut 2 over a shorter distance than the moving distance of the nut 2.
上記従来例にあっては、中間サポートＳの送りねじ支
持部A,Bは、その側面が工作機械のベッドの案内面と接
触して、中間サポートＳ全体が送りねじの両端部を支え
る軸受SA,SBの間で送り方向に自由に移動できるように
している。しかしながら、中間サポートＳの送りねじ支
持部A,Bは、左右方向の振れに対しては拘束されている
が上方には拘束されていないので、上向きに作用する振
動荷重を支持できないため高次の振動がでるという問題
点があった。In the above conventional example, the feed screw supporting portions A and B of the intermediate support S have their side surfaces in contact with the guide surface of the bed of the machine tool so that the entire intermediate support S supports the both ends of the feed screw. a, it is free to move in the feeding direction between the S B. However, the feed screw support portions A and B of the intermediate support S are restrained against run-out in the left-right direction but are not restrained upward, so that they cannot support an upwardly acting vibration load. There was a problem that vibration occurred.
更に、中間サポートの送りねじ支持部A,Bは、ベッド
の案内面と面接触しつつ移動するものであるから、摩擦
抵抗が大きく、駆動損失が大となると共に追従性が悪く
なるという問題点があった。Furthermore, since the feed screw supports A and B of the intermediate support move while being in surface contact with the guide surface of the bed, there is a problem that friction resistance is large, driving loss is large, and followability is deteriorated. was there.
又更に、第５図に示すように、軸受SA,SB間（距離2
l）に介挿した中間サポートＳは、その支持部A,B（距離
ｌ）に当接してから移動し始めるので、ナット２が支持
部A,Bの中間位置にある間は、支持スパンの間隔Ａ〜SA
またはＢ〜SBが軸受SA,SB間距離2lと中間サポートの支
持部A,B間距離ｌとの差ｌにより定まり、それ以上の短
縮はできないという問題点があった。なお、第６図は軸
受SA,SB間を往復移動する中間サポートＳの支持部A,B点
及びナット２の運動の相対位置関係を表し、1A→2A→3A
→4Aは支持部Ａの動きを、1B→2B→3B→4Bは支持部Ｂの
動きを、直線L2はナット２の動きを示す。Further, as shown in FIG. 5, between the bearings S A and S B (distance 2
Since the intermediate support S inserted in l) starts moving after abutting on the support portions A and B (distance l), while the nut 2 is at the intermediate position between the support portions A and B, the intermediate support S Interval A to S A
Alternatively, B to SB are determined by the difference 1 between the distance 2l between the bearings S A and S B and the distance l between the support portions A and B of the intermediate support, and there is a problem that further reduction is not possible. FIG. 6 shows the relative positions of the points A and B of the intermediate support S reciprocating between the bearings S A and S B and the movement of the nut 2, 1A → 2A → 3A
→ 4A is a movement of the support portion A, 1B → 2B → 3B → 4B is a movement of the support portion B, the straight line L 2 indicates the movement of the nut 2.
そこで本発明は、転がり摩擦で軽く動けることを長所
とするリニアガイド装置を利用してねじ軸中間サポート
を支持せしめると共に、ナットと中間サポートとを常時
連動せしめる手段を併設した送りねじ支持装置を提供し
て上記従来の問題点を解決することを目的とする。Therefore, the present invention provides a feed screw support device that supports a screw shaft intermediate support using a linear guide device having an advantage of being able to move lightly by rolling friction, and is provided with means for constantly linking the nut and the intermediate support. Then, it aims at solving the said conventional problem.
上記の目的を達成する本発明は、両端部が軸受を介し
て回転自在に支持されたねじ軸にナットが螺合され、該
ナットの軸方向には、ねじ軸のラジアル荷重を受けると
共にねじ軸方向に連動する一対の中間サポートが、ナッ
トの両側に位置せしめて連結して配設された送りねじ支
持装置において、前記ねじ軸の両端部の軸受間に、ねじ
軸に平行にリニアガイド装置を併設し、該リニアガイド
装置のスパイダに前記一対の中間サポートを取付けると
共に、該中間サポートと前記ねじ軸とを滑り係合せし
め、且つ、それら両中間サポートにそれぞれ配設した動
滑車とこれに巻き掛けして一端を固定し他端は前記ナッ
トに係止させた帯状部材とよりなり、中間サポートへの
前記ナットの移動力の伝達およびナット移動量に対する
中間サポート移動量の規制を兼用する滑車装置を併設し
たものである。According to the present invention, which achieves the above object, a nut is screwed onto a screw shaft whose both ends are rotatably supported via bearings. In the axial direction of the nut, the nut receives a radial load on the screw shaft and receives the screw shaft. In a feed screw support device in which a pair of intermediate supports interlocking in the direction are positioned and connected on both sides of the nut, a linear guide device is provided between bearings at both ends of the screw shaft in parallel with the screw shaft. At the same time, the pair of intermediate supports are attached to the spider of the linear guide device, and the intermediate support and the screw shaft are slidably engaged with each other. It is a belt-shaped member that is hung and fixed at one end and the other end is locked to the nut. The transmission of the moving force of the nut to the intermediate support and the movement of the intermediate support relative to the nut movement It is that features a pulley device that also serves as a control.
リニアガイド装置のスライダは、案内レールに跨架さ
れ、両者の側面に対向させて軸方向に設けられたボール
転動溝内に装着された多数のボールの転動を介して軸方
向に自在に移動する構成であり、案内レールの上下左右
方向には強固に拘束されているが案内レールの前後方向
へは極めて軽く移動できる。そのスライダに中間サポー
トを取付けたため、中間サポートが上向き荷重をも支持
できるようになり、且つ移動追従性が極めて良好であ
る。The slider of the linear guide device is straddled on the guide rail, and can freely move in the axial direction through the rolling of a large number of balls mounted in ball rolling grooves provided in the axial direction so as to face both sides. The guide rail is firmly restrained in the vertical and horizontal directions of the guide rail, but can move very lightly in the front and rear directions of the guide rail. Since the intermediate support is attached to the slider, the intermediate support can also support an upward load, and the movement followability is extremely good.
更にまた、ナットに連動して中間サポートが軸方向に
移可能とした滑車装置を併設したため、中間サポートが
常時ナットと共に移動し、ねじ軸の支持スパンが従来よ
り短縮される。Furthermore, since the pulley device that allows the intermediate support to be moved in the axial direction in conjunction with the nut is also provided, the intermediate support always moves together with the nut, and the support span of the screw shaft is shortened as compared with the related art.
以下、本発明の実施例を図とともに説明する。第１図
ないし第３図は、本発明の第１実施例を示すものであ
る。Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a first embodiment of the present invention.
装置の構成を示す第１図において、１はボールねじの
ねじ軸、２はこのねじ軸１に螺合されたボールねじのナ
ット（チューブ式片フランジダブルナット）である。ね
じ軸１の両端部は、機台３に間隔Ｌを隔てて固着された
２個の軸受ハウジング4,4にそれぞれ取付けた軸受５で
回転自在に支持されると共に、一方の軸端は軸受ハウジ
ング４に固着された回転駆動装置Ｍにカップリング６を
介して連結されている。ナット２は、ナットハウジング
７を介して機械テーブル８に取付けられている。機械テ
ーブル８は、その移動方向に対する左右の両サイド部
が、機台３上にねじ軸１と平行に取付けた１対の図示さ
れないリニアガイド装置で支承されている。In FIG. 1 showing the configuration of the apparatus, 1 is a screw shaft of a ball screw, and 2 is a ball screw nut (tube type single flange double nut) screwed to the screw shaft 1. Both ends of the screw shaft 1 are rotatably supported by bearings 5 attached to two bearing housings 4, 4 fixed to the machine base 3 with a space L therebetween, and one shaft end has a bearing housing. 4 is connected via a coupling 6 to a rotation drive device M fixed to 4. The nut 2 is mounted on a machine table 8 via a nut housing 7. The left and right sides of the machine table 8 with respect to the moving direction are supported by a pair of linear guide devices (not shown) mounted on the machine base 3 in parallel with the screw shaft 1.
このリニアガイド装置は、軸方向に長く延び機台３に
固定された案内レールと、その上に移動可能に跨架され
機械テーブル８に固定されたスライダとを備え、案内レ
ールの両外側面とスライダの内側面には対向させてボー
ル転動溝が配設され、これらの両ボール転動溝の間には
多数のボールが転動自在に装填され、そのボールの転動
を介してスライダが案内レール上を軸方向に軽く移動す
るようにした周知の構造のものである。The linear guide device includes a guide rail that extends in the axial direction and is fixed to the machine base 3, and a slider movably straddled thereon and fixed to the machine table 8. Ball rolling grooves are disposed on the inner surface of the slider so as to face each other, and between these two ball rolling grooves, a large number of balls are loaded so as to freely roll, and the slider is moved through the rolling of the balls. It has a well-known structure adapted to move lightly in the axial direction on the guide rail.
上記の機械テーブル８を支承するリニアガイド装置の
は別に、更に他の１個のリニアガイド装置10がねじ軸１
と平行に配設される。その案内レール11は、支点間距離
Ｌを隔てて向き合うねじ軸１の軸受ハウジング４の間に
おいて、機台３の一段低くされた面3a上に固定されてお
り、この案内レール11上に２個のスライダ12が取付けら
れている。Apart from the linear guide device that supports the machine table 8 described above, another one linear guide device 10 is a screw shaft 1.
It is arranged in parallel with. The guide rail 11 is fixed on a lower surface 3a of the machine base 3 between the bearing housings 4 of the screw shafts 1 facing each other at a distance L between the fulcrums. Slider 12 is mounted.
そして、これら２個のスライダ12の上面に、ねじ軸１
のラジアル荷重を受ける一対の中間サポート20A,20B
が、それぞれに固着されている。各中間サポート20A,20
Bはすべり軸受であり、ねじ軸１とは僅かの隙間を保っ
て挿通されている。一方、スライダ２はボールの転動を
介して極めて軽く案内レール11上を軸方向に移動可能で
ある。したがって中間サポート20A,20Bはスライダ12と
共に、滑らかに移動可能である。これら中間サポート20
A,20Bはナット２の両側に位置せしめて配設され、およ
そL/2の間隔を隔てて連結棒21で連動的に連結されてい
る。A screw shaft 1 is provided on the upper surface of these two sliders 12.
A pair of intermediate supports 20A and 20B that receive a radial load of
Are fixed to each. Each intermediate support 20A, 20
B denotes a slide bearing, which is inserted with a slight gap from the screw shaft 1. On the other hand, the slider 2 is extremely lightly movable in the axial direction on the guide rail 11 through the rolling of the ball. Therefore, the intermediate supports 20A and 20B can move smoothly together with the slider 12. These intermediate supports 20
A and 20B are disposed on both sides of the nut 2 and connected to each other by a connecting rod 21 at an interval of about L / 2.
更に、中間サポート20A,20Bとナット２との間には、
滑車装置22が併設されている。すなわち、中間サポート
20A,20Bのそれぞれに動滑車23A,23Bが取付けてあり、そ
れらの間に帯状部材である索24がループ状に張設されて
いる。索24は、その中央部で機台３に係止されると共に
反対側でナット２に係止されている。この実施例の索24
は、一端が機台３に係止固定されるとともに他端側がナ
ット２に係止された２本の索（24,24）よりなるものと
実質的に同じといえる。これにより、中間サポート20A,
20Bはナット２に連動して軸方向にすべり移動可能であ
る。Further, between the intermediate supports 20A, 20B and the nut 2,
A pulley device 22 is provided. That is, intermediate support
Movable pulleys 23A and 23B are attached to each of 20A and 20B, and a rope 24 as a belt-like member is stretched between them in a loop shape. The cable 24 is locked to the machine base 3 at its center and to the nut 2 on the opposite side. Cable 24 of this embodiment
Can be said to be substantially the same as one composed of two ropes (24, 24) having one end locked and fixed to the machine base 3 and the other end locked to the nut 2. As a result, the intermediate support 20A,
20B can slide in the axial direction in conjunction with the nut 2.
次に作用を説明する。 Next, the operation will be described.
回転駆動装置Ｍに駆動されてねじ軸１が所定の方向へ
回転すると、ナット２が例えば第１図で左方に移動し、
これに伴って機械テーブル８がその両サイドをリニアガ
イド装置に案内されつつ滑らかに移動する。このとき、
ねじ軸１の支点間距離Ｌが長いと、L2の値に反比例する
危険速度ｕの値が小さいから、ねじ軸１は比較的低速で
共振するおそれがある。しかし、中間サポート20A,20B
を設けたため、支点間距離（支持スパン）が最大値でも
L/2となり、その結果危険速度はｕの４倍と大幅にアッ
プし、共振しにくい。When the screw shaft 1 is rotated in a predetermined direction by being driven by the rotation drive device M, the nut 2 moves leftward in FIG.
Along with this, the machine table 8 moves smoothly while being guided on both sides by the linear guide device. At this time,
When distance between supporting points L of the screw shaft 1 is long, the value of the critical speed u is inversely proportional to the value of L 2 is small, the screw shaft 1 is likely to resonate relatively low speed. However, intermediate support 20A, 20B
The distance between fulcrums (support span) is the maximum value
L / 2 is obtained, and as a result, the critical speed is greatly increased to four times u, and resonance is difficult.
この実施例では更に、ナット２と中間サポート20A,20
Bとが滑車装置22を介して連動する。すなわち、いま第
２図において、両端の軸受5,5間の距離Ｌを1/4づつに区
切る点をP0,P1,P2,P3,P4とする。ナット２と中間サポー
ト20Bとが共にねじ軸１の右端P0点にあるとする（第２
図（ａ））。このとき支持スパンは、ねじ軸１の左端
（P4点）と中間サポート20A（P2）間において最長で、P
2〜P4＝L/2である。In this embodiment, the nut 2 and the intermediate supports 20A, 20A
B interlocks with the pulley device 22. That is, in FIG. 2, points at which the distance L between the bearings 5 at both ends is divided into quarters are P 0 , P 1 , P 2 , P 3 , and P 4 . The nut 2 and the intermediate support 20B are both a far right P 0 point of the screw shaft 1 (second
Figure (a). Support span this time, the left end of the screw shaft 1 (P 4 points) and a maximum in between intermediate supports 20A (P 2), P
2 to P 4 = L / 2.
この状態から機械テーブル８が左方に移動し、これに
伴いナット２が左方に移動しつつ滑車装置22（第２図で
は省略）の索24,動滑車23Bを介して中間サポート20A,20
Bを引っ張る。動滑車の作用で、ナット２の移動量に対
して1/2の割合で中間サポート20A,20Bも移動する。した
がって、ナット２が右端からL/4移動してP1点に達した
とき、左端の軸受５と中間サポート20A間の支持スパン
ａはａ＝3/8Lになり、従来の場合におけるL/2より短縮
されている（第２図（ｂ））。更にナット２がL/4左方
に移動してP2点に達したときは、中間サポート20AはL/8
左方に進行しており、P3点の位置になり、支持スパンａ
はａ＝L/4に縮小している（第２図（ｃ））。これから
更にナット２がL/4左方に移動してP3点に達したとき
は、中間サポート20Aも更にL/8左方に進行しており、P3
〜P4点の中間の位置になり、支持スパンａはａ＝L/8に
縮小する（第２図（ｄ））。又更にナット２がL/4左方
に移動して左端のP4点に達したときは、中間サポート20
Aも更にL/8左方に進行しており、左端P4点の位置にな
る。このとき支持スパンａはａ＝０になる。一方、右側
の中間サポート20BはP2点になり、右端P0点との間の支
持スパンｄは最長のL/2となる（第２図（ｅ））。From this state, the machine table 8 moves to the left, and accordingly the nut 2 moves to the left while the intermediate supports 20A, 20A move through the rope 24 of the pulley device 22 (not shown in FIG. 2) and the moving pulley 23B.
Pull B. Due to the action of the moving pulley, the intermediate supports 20A and 20B also move at a rate of 1/2 of the moving amount of the nut 2. Thus, when the nut 2 reaches the point P to L / 4 moves from the right end, the support span a between the left end of the bearing 5 and the intermediate support 20A becomes a = 3 / 8L, L / 2 in the case of the conventional It is even shorter (FIG. 2 (b)). Further when the nut 2 reaches the two points P moves to the L / 4 leftward, intermediate supports 20A is L / 8
And proceeding to the left, is the positioning of the P 3-point, support span a
Is reduced to a = L / 4 (FIG. 2 (c)). When it reaches the P 3 points further nut 2 now moves to the L / 4 leftward, and further proceeds to L / 8 leftward intermediate supports 20A, P 3
Becomes an intermediate position to P 4-point, support span a is reduced to a = L / 8 (FIG. 2 (d)). Still further when the nut 2 reaches the left end of the P 4 points go to L / 4 leftward, intermediate supports 20
A is also proceeding further to the left by L / 8, which is the position of the leftmost P 4 points. At this time, the support span a becomes a = 0. On the other hand, the right side of the intermediate support 20B becomes two points P, support span d between the right end P 0 point is the longest L / 2 (FIG. 2 (e)).
かくして、左方の支持スパンａは、ナット２の左方移
動と共に順次縮小していき、左端において零となり、反
対に右方の支持スパンｄは、ナット２の左方移動と共に
順次拡大していき、最大L/2となる。Thus, the left support span a gradually decreases with the leftward movement of the nut 2 and becomes zero at the left end, while the right support span d sequentially increases with the leftward movement of the nut 2. , And the maximum is L / 2.
ナット２がねじ軸１の左端部に至り左側の中間サポー
ト20Aに当接すると、図外のリミットスイッチが作動し
て回転駆動装置Ｍが停止され、ねじ軸１の回転が停止す
ると同時に、機械テーブル８の中間サポート20A,20Bも
停止するようにされ、安全が図られていることは云うま
でもない。When the nut 2 reaches the left end of the screw shaft 1 and abuts on the intermediate support 20A on the left side, a limit switch (not shown) is operated to stop the rotation drive device M, and at the same time the rotation of the screw shaft 1 is stopped and the mechanical table is stopped. It goes without saying that the intermediate supports 20A and 20B of the eighth unit are also stopped, thereby ensuring safety.
次に、回転駆動装置Ｍを反対方向に回転させると、ナ
ット２は機械テーブル８と共に第１図で右方に移動を始
める。Next, when the rotation drive device M is rotated in the opposite direction, the nut 2 starts to move rightward in FIG.
ナット２が左端から右方へ移動する場合は、軸受５と
中間サポート20Bとの支持スパンｄが上記支持スパンａ
と同様に連続的に縮小されていく（第２図（ｅ）→
（ａ））。When the nut 2 moves from the left end to the right, the support span d between the bearing 5 and the intermediate support 20B is equal to the support span a.
Is continuously reduced in the same manner as in FIG. 2 (e) →
(A)).
第３図は上記の支持スパンの変化を表したもので、直
線20aは中間サポート20Aの、直線20bは中間サポート20B
の、直線L2はナット２の、往復移動線である。FIG. 3 shows the change in the support span described above, where a straight line 20a is the intermediate support 20A, and a straight line 20b is the intermediate support 20B.
Of the straight line L 2 is of the nut 2, a reciprocating line.
この機械テーブル８及び中間サポート20A,20Bの送り
は、ボールナット２のみならず特にリニアガイド装置10
におけるスライダ12の作動を介して行われるから、高速
でも極めて円滑で追従性が良く、且つねじ軸１に対して
上下左右への振れも抑制され高精度である。これは、リ
ニアガイド装置10にあっては、案内レール11とスライダ
12とが、両者の側面に対向させて設けられたボール転動
溝内を転動する多数のボールを介して高剛性・高精度に
組み合わせてあり、スライダ12の直線移動性が非常に軽
くしかも安定しているためである。The feed of the machine table 8 and the intermediate supports 20A and 20B is performed not only by the ball nut 2 but also by the linear guide device 10 in particular.
Since the movement is performed through the operation of the slider 12 in the above, the movement is extremely smooth and has good followability even at a high speed, and the vibration of the screw shaft 1 in the vertical and horizontal directions is suppressed and the precision is high. In the linear guide device 10, the guide rail 11 and the slider
12 are combined with high rigidity and high precision through a number of balls rolling in ball rolling grooves provided opposite to both side surfaces, and the linear movement of the slider 12 is very light and Because it is stable.
ナット２が距離Ｌを移動し、中間サポート20A,20Bが
これに連動して、やがてねじ軸１の右端部に至ると、左
端部におけると同様の図外のリミットスイッチが作動し
て回転駆動装置Ｍが停止され、ねじ軸１の回転が停止す
ると同時に、機械テーブル８と中間サポート20A,20Bも
停止するようにされている。When the nut 2 moves a distance L, and the intermediate supports 20A and 20B move in conjunction therewith and eventually reach the right end of the screw shaft 1, a limit switch (not shown) similar to that at the left end is operated to rotate the rotation drive device. M is stopped, and the rotation of the screw shaft 1 is stopped, and at the same time, the machine table 8 and the intermediate supports 20A, 20B are also stopped.
この実施例によれば、ナット２の位置がねじ軸１の両
端部にあるときを除き、中間サポート20A,20Bによるね
じ軸１の支持スパンは、常に従来より短くなり、したが
って軸危険速度が安全側に高められる。According to this embodiment, the support span of the screw shaft 1 by the intermediate supports 20A and 20B is always shorter than before, except when the position of the nut 2 is at both ends of the screw shaft 1, so that the critical speed of the shaft is safe. Raised to the side.
第４図には他の実施例を示す。 FIG. 4 shows another embodiment.
この実施例は、滑車装置22の構成が第１実施例とは異
なる。すなわち、動滑車23A,23Bに共通の索24をループ
状に張設する代わりに、独立の索25,26をそれぞれに張
設し、各索毎にナット２及び機台３に係止している。This embodiment differs from the first embodiment in the configuration of the pulley device 22. That is, instead of extending the rope 24 common to the moving pulleys 23A and 23B in a loop shape, independent ropes 25 and 26 are respectively extended and engaged with the nut 2 and the machine base 3 for each rope. I have.
作用、効果の点で、第１実施例と本質的に異なるとこ
ろはない。There is essentially no difference in operation and effect from the first embodiment.
なお、上記の実施例において、ナット２はダブルナッ
トを用いた場合を説明したが、シングルナットでも同様
の効果が得られることは勿論である。In the above embodiment, the case where a double nut is used as the nut 2 has been described, but it is a matter of course that the same effect can be obtained with a single nut.
また、上記実施例では、滑車装置22の帯状部材として
索24を用いたものを述べたが、その他スチールベルトな
どでも良い。Further, in the above embodiment, the pulley device 22 using the cable 24 as the belt-like member has been described, but a steel belt or the like may be used.
また、中間サポート20A,20Bの支点間距離について
は、所定のねじ軸１の所要回転数と危険速度との関係を
考慮して設定される。Further, the distance between the fulcrums of the intermediate supports 20A and 20B is set in consideration of the relationship between the required rotation speed of the predetermined screw shaft 1 and the critical speed.
以上説明したように、本発明によれば、ナットが螺合
され、両端が回転自在に支持されたねじ軸のナットを挟
み、ねじ軸の中間サポートがねじ軸方向に移動可能に配
設された送りねじ支持装置において、前記中間サポート
をリニアガイド装置で支承すると共に、中間サポートと
機台とナット間に動滑車を有する滑車装置を併設した。
リニアガイド装置は、案内レールに跨架されたスライダ
が案内レールの上下左右方向に強固に拘束されているが
案内レールの前後方向へは極めて軽く移動できるから、
中間サポートが上向き振動荷重をも支持できるようにな
り、且つ高速移動の追従性が極めて良好になるという効
果が得られる。As described above, according to the present invention, the nut is screwed, and both ends of the screw shaft are rotatably supported, and the intermediate support of the screw shaft is disposed movably in the screw axis direction. In the feed screw support device, the intermediate support is supported by a linear guide device, and a pulley device having a moving pulley is provided between the intermediate support, the machine base, and the nut.
In the linear guide device, the slider straddled on the guide rail is firmly restrained in the vertical and horizontal directions of the guide rail, but can move very lightly in the front and rear direction of the guide rail,
The effect that the intermediate support can support the upward vibration load and the followability of the high-speed movement is extremely improved is obtained.
加えて、中間サポートが滑車装置を介してナットに連
動するから、ねじ軸の支持スパンがナットの移動に伴い
順次短縮されるという効果が得られる。In addition, since the intermediate support is interlocked with the nut via the pulley device, the effect is obtained that the support span of the screw shaft is sequentially reduced as the nut moves.
第１図ないし第３図は本発明の第１実施例で、第１図は
一部を断面で表した側面図、第２図（ａ）〜（ｅ）はナ
ットと中間サポートとの作動説明図、第３図は中間サポ
ートの支持部及びナットの運動に伴う相対位置関係の変
化を表す図、第４図は本発明の第２実施例の一部を断面
で表した側面図、第５図（ａ）〜（ｅ）は従来例におけ
るナットと中間サポートとの作動説明図、第６図は同じ
く従来の中間サポートの支持部及びナットの運動に伴う
相対位置関係の変化を表す図である。 １はねじ軸、２はナット、５は軸受、10はリニアガイド
装置、12はスライダ、20A,20Bは中間サポート、22は滑
車装置。FIGS. 1 to 3 show a first embodiment of the present invention. FIG. 1 is a side view showing a part in section, and FIGS. 2 (a) to 2 (e) explain the operation of a nut and an intermediate support. FIG. 3 is a diagram showing a change in the relative positional relationship with the movement of the support portion and the nut of the intermediate support. FIG. 4 is a side view showing a part of the second embodiment of the present invention in cross section. (A) to (e) are explanatory diagrams of the operation of the nut and the intermediate support in the conventional example, and FIG. 6 is a diagram similarly showing a change in the relative positional relationship with the movement of the support portion and the nut of the conventional intermediate support. . 1 is a screw shaft, 2 is a nut, 5 is a bearing, 10 is a linear guide device, 12 is a slider, 20A and 20B are intermediate supports, and 22 is a pulley device.
Claims (1)
たねじ軸にナットが螺合され、該ナットの軸方向には、
ねじ軸のラジアル荷重を受けると共にねじ軸方向に連動
する一対の中間サポートが、ナットの両側に位置せしめ
て連結して配設された送りねじ支持装置において、 少なくとも前記ねじ軸の両端部の軸受間に、ねじ軸に平
行にリニアガイド装置を併設し、該リニアガイド装置の
スライダに前記一対の中間サポートを取り付けると共
に、該中間サポートと前記ねじ軸とを滑り係合せしめ、
且つ、それら両中間サポートにそれぞれ配設した動滑車
とこれに巻き掛けして一端を固定し他端は前記ナットに
係止させた帯状部材とよりなり、中間サポートへの前記
ナットの移動力の伝達およびナット移動量に対する中間
サポート移動量の規制を兼用する滑車装置を併設したこ
とを特徴とする送りねじ支持装置。A nut is screwed onto a screw shaft whose both ends are rotatably supported via bearings, and an axial direction of the nut is
In a feed screw support device, which receives a radial load on a screw shaft and is interlocked in the screw shaft direction and is disposed on both sides of the nut and connected to each other, at least between bearings at both ends of the screw shaft. In addition, a linear guide device is provided in parallel with the screw shaft, and the pair of intermediate supports are attached to a slider of the linear guide device, and the intermediate support and the screw shaft are slidably engaged with each other,
In addition, each of the intermediate supports is provided with a moving pulley and a belt-like member wound around the moving pulley and fixed at one end, and the other end is locked to the nut, and the moving force of the nut to the intermediate support is reduced. A feed screw support device provided with a pulley device that also serves to regulate an intermediate support movement amount with respect to a transmission and a nut movement amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63217748A JP2867386B2 (en) | 1988-08-31 | 1988-08-31 | Feed screw support device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63217748A JP2867386B2 (en) | 1988-08-31 | 1988-08-31 | Feed screw support device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0266359A JPH0266359A (en) | 1990-03-06 |
| JP2867386B2 true JP2867386B2 (en) | 1999-03-08 |
Family
ID=16709130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63217748A Expired - Fee Related JP2867386B2 (en) | 1988-08-31 | 1988-08-31 | Feed screw support device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2867386B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101837554A (en) * | 2010-05-19 | 2010-09-22 | 杭州机床集团有限公司 | Pull-type follow-up bearing device of long lead screw of machine tool |
| JP2011174507A (en) * | 2010-02-23 | 2011-09-08 | Tsubaki Emerson Co | Straight line operating device |
| KR101512763B1 (en) * | 2014-02-19 | 2015-04-16 | 히윈 테크놀러지스 코포레이션 | Support structure for a ball screw |
| WO2017163422A1 (en) | 2016-03-25 | 2017-09-28 | アズビル株式会社 | Conveying device and storage device |
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|---|---|---|---|---|
| JP2585882Y2 (en) * | 1990-06-06 | 1998-11-25 | 株式会社協豊製作所 | Ball screw moving device |
| JP2526816B2 (en) * | 1992-10-14 | 1996-08-21 | 日本精工株式会社 | Movable body feeding device |
| JPH0643407U (en) * | 1992-11-25 | 1994-06-10 | 八千代工業株式会社 | Sliding body drive |
| US5531557A (en) * | 1994-07-01 | 1996-07-02 | Rite-Hite Corporation | Drive screw system with nested mobile supports |
| US5425607A (en) * | 1994-07-13 | 1995-06-20 | Thermwood Corporation | Anti-whip device for machine drive screws |
| JP3221804B2 (en) * | 1994-09-28 | 2001-10-22 | 先生精機株式会社 | Actuator |
| DE19758916B4 (en) * | 1996-09-06 | 2011-12-08 | Bosch Rexroth Mechatronics Gmbh | Linear guide unit |
| DE19636272A1 (en) * | 1996-09-06 | 1998-03-12 | Star Gmbh | Linear guide device |
| WO2001039923A2 (en) * | 1999-11-30 | 2001-06-07 | HüLLER HILLE GMBH | Machine tool, in particular a long-bed machine tool |
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Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63163059A (en) * | 1986-12-24 | 1988-07-06 | Toshiba Corp | Bearing device |
-
1988
- 1988-08-31 JP JP63217748A patent/JP2867386B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011174507A (en) * | 2010-02-23 | 2011-09-08 | Tsubaki Emerson Co | Straight line operating device |
| CN101837554A (en) * | 2010-05-19 | 2010-09-22 | 杭州机床集团有限公司 | Pull-type follow-up bearing device of long lead screw of machine tool |
| KR101512763B1 (en) * | 2014-02-19 | 2015-04-16 | 히윈 테크놀러지스 코포레이션 | Support structure for a ball screw |
| WO2017163422A1 (en) | 2016-03-25 | 2017-09-28 | アズビル株式会社 | Conveying device and storage device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0266359A (en) | 1990-03-06 |
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