JP2016148453A - Movement guide device - Google Patents
Movement guide device Download PDFInfo
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- JP2016148453A JP2016148453A JP2016044228A JP2016044228A JP2016148453A JP 2016148453 A JP2016148453 A JP 2016148453A JP 2016044228 A JP2016044228 A JP 2016044228A JP 2016044228 A JP2016044228 A JP 2016044228A JP 2016148453 A JP2016148453 A JP 2016148453A
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Abstract
Description
本発明は、油路の上流側と下流側とを互いに連通して上流側より下流側の断面積を減少させる油路用絞りを利用した油路絞り装置を設けた移動案内装置に関するものである。 The present invention relates to a movement guide device provided with an oil passage throttle device that uses a throttle for an oil passage that communicates the upstream side and the downstream side of the oil passage with each other to reduce the cross-sectional area downstream from the upstream side. .
従来の移動案内装置では、案内体と移動体との間の滑り面間に油膜を形成するために静圧軸受のポケットに油を供給する油路が設けられている(例えば下記の特許文献1を参照)。 In a conventional movement guide device, an oil passage that supplies oil to a pocket of a hydrostatic bearing is provided in order to form an oil film between sliding surfaces between the guide body and the moving body (for example, Patent Document 1 below). See).
このような油路では、静圧軸受の油ポケットより上流側に供給される流量を制限して油ポケットの圧力を安定させるために絞りを設けることが一般に行われている。しかし、絞り流量を維持するために絞り内の油路の断面積を大きくし過ぎると、絞り内の油路で乱流を生じるおそれがある。そのような絞りから油ポケット側へ広がって流出する油は、絞りと油ポケットとの間の油路で乱流を生じるおそれがあるため、乱流による流速の変動とともに圧力の変動が大きくなって油ポケットの圧力が不安定になり、案内体に対する移動体の移動抵抗も不安定になる。その結果、工作機械においては加工精度が低下する。 In such an oil passage, it is a common practice to provide a throttle in order to stabilize the pressure in the oil pocket by limiting the flow rate supplied to the upstream side of the oil pocket of the hydrostatic bearing. However, if the cross-sectional area of the oil passage in the throttle is made too large to maintain the throttle flow rate, turbulence may occur in the oil passage in the throttle. The oil that flows out from the throttle to the oil pocket side may cause turbulent flow in the oil passage between the throttle and the oil pocket. The pressure in the oil pocket becomes unstable, and the movement resistance of the moving body with respect to the guide body also becomes unstable. As a result, machining accuracy is reduced in the machine tool.
この発明は、油の乱流の発生を極力防止する油路用絞りを利用した油路絞り装置を設けた移動案内装置を提供することを目的としている。 An object of the present invention is to provide a movement guide device provided with an oil passage throttle device using an oil passage throttle that prevents the occurrence of turbulent oil flow as much as possible.
後記実施形態の図面(図1〜2)の符号を援用して本発明を説明する。
請求項1の発明にかかる移動案内装置においては、案内体(2)上に静圧軸受(5)を介して移動体(3)を支持するとともに、駆動手段(4)によりこの移動体(3)を案内体(2)に対し移動させるようにしている。案内体(2)と移動体(3)との間の滑り面(8)間に配設されている静圧軸受(5)の油ポケット(6)に油路(7)が接続され、前記駆動手段(4)を挟む幅方向の両側で滑り面(8)に連通する油排出溝(8a)が形成されている。前記油路(7)に、複数の細路(13a,13b)を並列状態に配設した細路群(10)を有している油路用絞り(9)を、油路(7)の上流側と下流側とを互いに連通して上流側より下流側の断面積を減少させるように設けた油路絞り装置を備えている。請求項1の発明では、移動案内装置において油路用絞り(9)から静圧軸受(5)の油ポケット(6)側へ流出する油の乱流の発生を極力防止することができる。
The present invention will be described with reference to the reference numerals of the drawings (FIGS. 1 and 2) of the embodiments described later.
In the movement guide device according to the first aspect of the present invention, the movable body (3) is supported on the guide body (2) via the hydrostatic bearing (5), and the movable body (3) is driven by the driving means (4). ) Is moved relative to the guide body (2). An oil passage (7) is connected to the oil pocket (6) of the hydrostatic bearing (5) disposed between the sliding surface (8) between the guide body (2) and the moving body (3), Oil discharge grooves (8a) communicating with the sliding surface (8) are formed on both sides in the width direction across the drive means (4). An oil passage throttle (9) having a narrow passage group (10) in which a plurality of narrow passages (13a, 13b) are arranged in parallel to the oil passage (7) is connected to the oil passage (7). An oil passage throttle device is provided so that the upstream side and the downstream side communicate with each other to reduce the cross-sectional area downstream from the upstream side. According to the first aspect of the present invention, it is possible to prevent the occurrence of the turbulent flow of the oil flowing out from the oil passage restriction (9) to the oil pocket (6) side of the hydrostatic bearing (5) as much as possible in the movement guide device.
請求項1の発明を前提とする請求項2の発明にかかる移動案内装置において、複数の細路(13a,13b)は油路(7)の上流側から下流側へ油ポケット(6)に向けて互いに平行に直線的に延設されている。請求項2の発明では、細路群(10)の各細路(13a,13b)を通過する油を整流として流出させ易くして乱流の発生を極力防止することができる。 In the movement guide apparatus according to the invention of claim 2 based on the invention of claim 1, the plurality of narrow passages (13a, 13b) are directed from the upstream side to the downstream side of the oil passage (7) toward the oil pocket (6). And extend linearly parallel to each other. According to the second aspect of the present invention, the oil passing through the narrow passages (13a, 13b) of the narrow passage group (10) can be easily discharged as rectification to prevent the occurrence of turbulence as much as possible.
本発明は、移動案内装置において油路用絞り(9)から静圧軸受(5)の油ポケット(6)側へ流出する油の乱流の発生を極力防止することができる。 The present invention can prevent the occurrence of turbulent flow of oil flowing out from the oil passage throttle (9) to the oil pocket (6) side of the hydrostatic bearing (5) as much as possible in the movement guide device.
以下、本発明の一実施形態にかかる油路用絞り、その油路用絞りを利用した油路絞り装置、その油路絞り装置を利用した移動案内装置について図面を参照して説明する。
この移動案内装置は例えば工作機械において加工テーブルを移動案内する場合に適用され、図1に示すように、機台1上に載設された案内体2上には加工テーブルを構成する移動体3が油膜を介して非接触状態で支持されている。案内体2と移動体3との間には駆動手段としてのリニアモータ4が設けられているとともに静圧軸受5が設けられている。静圧軸受5にはリニアモータ4を挟む幅方向の両側の側面及び上面でそれぞれ複数の油ポケット6が図示紙面と直交する長手方向に沿って配設されている。リニアモータ4は、案内体2側に設けられたコイルよりなる固定子4aと、移動体3側に設けられたマグネットよりなる移動子4bとを備え、案内体2に対し移動体3を一軸線に沿って長手方向へ移動させることができる。
Hereinafter, an oil passage throttle according to an embodiment of the present invention, an oil passage throttle device using the oil passage throttle, and a movement guide device using the oil passage throttle device will be described with reference to the drawings.
This movement guide device is applied, for example, when a machining table is moved and guided in a machine tool. As shown in FIG. 1, a moving body 3 constituting a machining table is provided on a guide body 2 mounted on a machine base 1. Is supported in a non-contact state via an oil film. Between the guide body 2 and the moving body 3, a linear motor 4 is provided as a driving means and a hydrostatic bearing 5 is provided. The hydrostatic bearing 5 is provided with a plurality of oil pockets 6 along the longitudinal direction perpendicular to the drawing sheet on both side surfaces and upper surface in the width direction across the linear motor 4. The linear motor 4 includes a stator 4 a made of a coil provided on the guide body 2 side and a mover 4 b made of a magnet provided on the moving body 3 side, and the moving body 3 is uniaxial with respect to the guide body 2. Along the longitudinal direction.
図2に示すように、静圧軸受5の各油ポケット6は、油路7に接続され、油路7から供給された油により、案内体2と移動体3との間の滑り面8間に油膜を形成する。案内体2にはリニアモータ4を挟む幅方向の両側でそれぞれ滑り面8に連通する油排出溝8aが形成されている。油路7には上流側より下流側の断面積を減少させる絞り9が油ポケット6より若干上流側で油ポケット6に面して着脱可能に取着されている。 As shown in FIG. 2, each oil pocket 6 of the hydrostatic bearing 5 is connected to an oil passage 7, and between the sliding surfaces 8 between the guide body 2 and the moving body 3 by the oil supplied from the oil passage 7. An oil film is formed on the surface. The guide body 2 is formed with oil discharge grooves 8 a communicating with the sliding surface 8 on both sides in the width direction across the linear motor 4. A throttle 9 for reducing the cross-sectional area downstream from the upstream side is detachably attached to the oil passage 7 so as to face the oil pocket 6 slightly upstream from the oil pocket 6.
図3に示すように、絞り9は、油路7の上流側と下流側とを互いに連通する細路群10と、細路群10の上流側に配設されて油路7に介在された流入口部11とを有している。絞り9の流入口部11の外周には雄ねじ部11aが形成されている。絞り9の流入口部11の内周には六角形状の回し孔11bが形成されている。細路群10は互いに束ねられて保持管12に圧入されて挿着された複数の細路管13を有している。保持管12は、流入口部11に対し溶接などにより取着されている。保持管12の外周面は油路7の内周面に対し隙間を有している。各細路管13内の細路13a以外に、保持管12内で互いに隣接する各細路管13間にも細路13bが設けられている。各細路管13内の細路13a,13bは、流入口部11の回し孔11bに連通され、油路7の上流側から下流側へ油ポケット6に向けて互いに平行な並列状態で直線的に延設され、それぞれ同一の流路径及び同一の流路長さを有している。その流路径及び流路長さや細路管13の本数は諸条件に応じて適宜設定することができる。 As shown in FIG. 3, the throttle 9 is disposed on the upstream side of the narrow passage group 10 that connects the upstream side and the downstream side of the oil passage 7 to each other, and interposed in the oil passage 7. And an inlet portion 11. A male screw portion 11 a is formed on the outer periphery of the inlet portion 11 of the throttle 9. A hexagonal rotation hole 11 b is formed on the inner periphery of the inlet portion 11 of the throttle 9. The narrow path group 10 has a plurality of narrow path pipes 13 which are bundled together and press-fitted into the holding pipe 12 and inserted. The holding tube 12 is attached to the inflow port portion 11 by welding or the like. The outer peripheral surface of the holding tube 12 has a gap with respect to the inner peripheral surface of the oil passage 7. In addition to the narrow passages 13 a in the narrow passages 13, narrow passages 13 b are also provided between the narrow passages 13 adjacent to each other in the holding tube 12. The narrow passages 13a and 13b in each narrow pipe 13 are communicated with the turning hole 11b of the inflow port portion 11, and are linearly parallel to each other from the upstream side to the downstream side of the oil passage 7 toward the oil pocket 6. And have the same channel diameter and the same channel length. The diameter and length of the flow path and the number of narrow pipes 13 can be appropriately set according to various conditions.
絞り9に隣接する油路7の開口部には絞り9より大径の雌ねじ部7aが形成され、その雌ねじ部7aにはシールリング14を装着した止めねじ15が着脱可能に螺合されてその油路7の開口部を閉塞している。絞り9は開口部の雌ねじ部7aから油路7内に挿入され、油路7に形成された雌ねじ部7bに流入口部11の雄ねじ部11aが螺合されている。流入口部11の回し孔11bに挿嵌されたレンチにより、その雌ねじ部7bと雄ねじ部11aとで進退させて絞り9の位置を調節することができる。 A female screw portion 7a having a diameter larger than that of the restrictor 9 is formed in the opening of the oil passage 7 adjacent to the restrictor 9, and a set screw 15 fitted with a seal ring 14 is detachably screwed into the female screw portion 7a. The opening of the oil passage 7 is closed. The restrictor 9 is inserted into the oil passage 7 from the female screw portion 7 a of the opening, and the male screw portion 11 a of the inflow port portion 11 is screwed into the female screw portion 7 b formed in the oil passage 7. With the wrench inserted in the rotation hole 11b of the inflow port portion 11, the position of the throttle 9 can be adjusted by advancing and retreating with the female screw portion 7b and the male screw portion 11a.
次に、このような移動案内装置に利用した油路絞り装置の絞り作用を説明する。
油路7において絞り9の上流側から流入口部11に流入した油は、保持管12内の各細路13a,13bを通過して絞り9の下流側へ流出する。各細路13a,13bを通過する油は、乱流を生じにくくなって安定するため、絞り9から整流として静圧軸受5の油ポケット6側へ流出され易くなる。そのため、油ポケット6の圧力が安定して、案内体2に対する移動体3の移動抵抗も安定にする。
Next, the squeezing action of the oil passage squeezing device used in such a movement guide device will be described.
In the oil passage 7, the oil flowing into the inlet portion 11 from the upstream side of the throttle 9 passes through the narrow passages 13 a and 13 b in the holding pipe 12 and flows out downstream of the throttle 9. The oil that passes through the narrow passages 13a and 13b is less likely to generate turbulent flow and is stable, so that the oil is likely to flow out from the throttle 9 to the oil pocket 6 side of the hydrostatic bearing 5 as rectification. Therefore, the pressure of the oil pocket 6 is stabilized, and the movement resistance of the moving body 3 with respect to the guide body 2 is also stabilized.
本実施形態は下記の効果を有する。
(1)静圧軸受5を採用した移動案内装置に備えた油路絞り装置の絞り9においては、複数の細路13a,13bを並列状態に配設した細路群10により、油路7における絞り流量を維持したまま上流側より下流側の断面積を減少させたので、細路群10の各細路13a,13bを通過して絞り9から静圧軸受5の油ポケット6側へ流出する油は、整流として流出され易くなって乱流の発生を極力防止することができる。
This embodiment has the following effects.
(1) In the throttle 9 of the oil passage throttle device provided in the movement guide device adopting the hydrostatic bearing 5, the narrow passage group 10 in which a plurality of narrow passages 13a and 13b are arranged in parallel causes the oil passage 7 to Since the cross-sectional area on the downstream side from the upstream side is reduced while maintaining the throttle flow rate, it passes through the narrow passages 13a and 13b of the narrow passage group 10 and flows out from the throttle 9 to the oil pocket 6 side of the hydrostatic bearing 5. The oil is easily discharged as rectification, and the generation of turbulent flow can be prevented as much as possible.
(2)複数の細路管13を保持管12に挿着して束ねたので、複数の細路13a,13bを並列状態に配設した細路群10を容易に設けることができる。
前記実施形態以外にも例えば下記のように構成してもよい。
(2) Since the plurality of narrow passages 13 are inserted into the holding tube 12 and bundled, the narrow passage group 10 in which the plurality of narrow passages 13a and 13b are arranged in parallel can be easily provided.
For example, the following embodiment may be configured as follows.
・保持管12に複数の細路管13を挿着して束ねた細路群10に代えて、一本の軸に複数の細路を貫設して細路群を設けてもよい。
・各細路管13内の細路13a,13bについては、互いに異なる流路径としてもよい。
-Instead of the narrow path group 10 in which a plurality of narrow path pipes 13 are inserted into the holding pipe 12 and bundled, a plurality of narrow paths may be provided through a single shaft to provide the narrow path group.
-About the narrow paths 13a and 13b in each narrow path pipe 13, it is good also as a mutually different flow path diameter.
・油路絞り装置は、工作機械において加工テーブルを移動案内する移動案内装置以外にも適用することができる。また、移動案内装置以外にも油路を絞る必要のある各種の装置に適用することができる。 The oil path throttle device can be applied to other than the movement guide device that moves and guides the machining table in the machine tool. In addition to the movement guide device, the present invention can be applied to various devices that need to narrow the oil passage.
2…案内体、3…移動体、4…リニアモータ(駆動手段)、5…静圧軸受、6…油ポケット、7…油路、8…滑り面、9…絞り、10…細路群、11…流入口部、12…保持管、13…細路管、13a,13b…細路。 2 ... guide body, 3 ... moving body, 4 ... linear motor (drive means), 5 ... hydrostatic bearing, 6 ... oil pocket, 7 ... oil path, 8 ... sliding surface, 9 ... throttle, 10 ... narrow path group, DESCRIPTION OF SYMBOLS 11 ... Inlet part, 12 ... Holding pipe, 13 ... Narrow pipe, 13a, 13b ... Narrow path.
Claims (2)
案内体と移動体との間の滑り面間に配設されている静圧軸受の油ポケットに油路が接続され、前記駆動手段を挟む幅方向の両側で滑り面に連通する油排出溝が形成されており、
前記油路に、複数の細路を並列状態に配設した細路群を有している油路用絞りを、油路の上流側と下流側とを互いに連通して上流側より下流側の断面積を減少させるように設けた油路絞り装置を備えることを特徴とする移動案内装置。 In the movement guide device which supports the moving body via the hydrostatic bearing on the guide body and moves the moving body with respect to the guide body by the driving means,
An oil passage is connected to an oil pocket of a hydrostatic bearing disposed between the sliding surface between the guide body and the moving body, and an oil discharge groove communicating with the sliding surface on both sides in the width direction sandwiching the driving means. Formed,
An oil passage throttle having a group of narrow passages in which a plurality of narrow passages are arranged in parallel to the oil passage, the upstream side and the downstream side of the oil passage communicate with each other, and the downstream side from the upstream side. A movement guide device comprising an oil passage throttle device provided so as to reduce a cross-sectional area.
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Citations (2)
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JPS4731668U (en) * | 1971-04-27 | 1972-12-09 | ||
JP2005238442A (en) * | 2005-03-30 | 2005-09-08 | Toyoda Mach Works Ltd | Slide guide device |
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JPS4731668U (en) * | 1971-04-27 | 1972-12-09 | ||
JP2005238442A (en) * | 2005-03-30 | 2005-09-08 | Toyoda Mach Works Ltd | Slide guide device |
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