JPS6319488A - Rotary joint for fluid - Google Patents
Rotary joint for fluidInfo
- Publication number
- JPS6319488A JPS6319488A JP61164391A JP16439186A JPS6319488A JP S6319488 A JPS6319488 A JP S6319488A JP 61164391 A JP61164391 A JP 61164391A JP 16439186 A JP16439186 A JP 16439186A JP S6319488 A JPS6319488 A JP S6319488A
- Authority
- JP
- Japan
- Prior art keywords
- fluid
- annular gap
- rotary
- rotary joint
- outer diameter
- 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.)
- Pending
Links
- 239000012530 fluid Substances 0.000 title claims description 19
- 238000003754 machining Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000009291 secondary effect Effects 0.000 description 1
Landscapes
- Joints Allowing Movement (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
［産業上の利用分野１
この発明は、回転体の突出部外径と供給体内径との間に
適量の環状スキマを設けると同時に、環状スキマ部の回
転体突出部外径及び（または）供給体内径にフッ素系樹
脂をコーティングした流体周回体継手、具体的には工作
機械用回転流体圧シリンダに用いるものである。[Industrial Application Field 1] This invention provides an annular gap of an appropriate amount between the outer diameter of the protrusion of a rotating body and the inner diameter of the supply body, and at the same time This is a fluid circulating body joint whose internal diameter is coated with fluororesin, specifically for use in rotary fluid pressure cylinders for machine tools.
【従来の技術］
（１） 加工精度を上げることにより回転体の突出部
外径と供給体内径との間の環状スキマを小さくする。
（２） 回転体突出部外径と供給体内径とはハメアイ公
差程度の環状スキマとし、且つ流体漏れのないようグラ
ンドパツキン等のシール材を用いる。
［発明が解決しようとする間厘点］
しかし、前述のような前者の従来技術においては、気温
差による材料の膨張により、環状スキマが大きくなって
流体漏れが多くなったり、材料の収縮により環状スキマ
がなくなって焼付きを発生していた。
また、前述の後者の従来技術においては、流体漏れは少
なくすることができるものの、シール材と回転軸の摩擦
熱が大きくなり、そのため流体用回転継手自体の温度が
上昇し、たとえば工作機械用の回転流体圧シリンダとし
て使用に耐え得ないものとなっていた。
本発明は、従来技術では対処できなかった以上の欠点を
解決することにより加工能率、加工精度向上を技術開発
の指向とする工作機械メーカの要望に答え得る高速回転
可能な流体用回転継手の開発が可能となり、また気温差
等の環境変化にも対処し得ることとなった。
［問題点を解決するための手段］
回転体の突出部外径と供給体内径との間に適量の環状ス
キマを設けると共に、環状スキマ部の回転体突出部外径
または供給体内径にフッ素系樹脂をコーティングするこ
とにより、上述の従来技術の問題点の解決をはかるもの
である。
【実施例】
以下、本発明の実施例として回転エアシリンダについて
、第２図を用い詳しく説明する。
往復動可能なピストン２１を内蔵した回転体２６の突出
部２２と、該突出部に貫通し且つベアリング２３によっ
て支えられた前記回転体内のピストン２１に、エアを供
給する流路２４の穿設された静止部２７の供給体２５を
有する回転エアシリンダにおいて、第１図の部分拡大図
において図示するように、回転体の突出部外径１１と供
給体内径１２との間の環状スキマを、加工精度を不必要
にあげることなくエア漏れを減少させ、容量の大きなコ
ンプレッサが不要となる程度の最終環状スキマ１３を得
るため、たとえば雰囲気温度が２０℃の時は、初期環状
スキマ１４を５０μｍになるように加工し、供給体２５
の内径１２に、及び（または）回転体突出部外径１１に
フッ素系樹脂１５を１０〜２０μｍとなる厚さにコーテ
ィングをし、ｌＯμｍ前後の最終環状スキマ１３とする
。
雰囲気温度の温度差による材料収縮により、最終環状ス
キマ１３がなくなった場合、回転初期においてはフッ素
系樹脂１５が有する特性、すなわち低摩擦係数、自己潤
滑性、非溶着性、耐熱性により焼付くことはなく、また
前記期間経過後においては、供給体２７と回転体２６が
ベアリング２３によって支えられていることから、第３
図に図示するように接触する量はフッ素系樹脂３１の所
謂コールドフロラ（成形されたものが圧力により変形す
ること）により接触部分のフッ素系樹脂は接触していな
い部分に移動を行い、あるいは環状スキマ部からはみ出
し、最終的には最少の環状スキマで無接触の状態を得る
ことができるので、やはり焼付くことカーない。
同心度の加工精度不良、あるいはベアリングのラジアル
スキマにより、回転体の突出部外径と供給体内径との間
に当初から適量の環状スキマを設けることができない場
合にも、フッ素系樹脂の前記特性、即ち低摩擦係数、自
己潤滑性、非溶着性、耐熱性により焼付くことがないの
である。[Prior Art] (1) The annular gap between the outer diameter of the protrusion of the rotating body and the inner diameter of the supply body is reduced by increasing the machining accuracy. (2) There should be an annular gap between the outer diameter of the protruding part of the rotating body and the inner diameter of the supply body, and a sealing material such as gland packing should be used to prevent fluid leakage. [Disadvantages to be Solved by the Invention] However, in the former conventional technology as described above, the annular gap becomes large due to the expansion of the material due to temperature differences, resulting in increased fluid leakage, and the annular gap increases due to material contraction. There was no clearance and burn-in occurred. In addition, in the latter conventional technology mentioned above, although fluid leakage can be reduced, the frictional heat between the sealing material and the rotating shaft increases, which increases the temperature of the fluid rotary joint itself, and, for example, It had become unusable as a rotary fluid pressure cylinder. The present invention aims to develop a rotary joint for fluids capable of high-speed rotation, which can meet the needs of machine tool manufacturers who aim to improve machining efficiency and machining accuracy in technological development by solving the drawbacks that could not be addressed with conventional technology. It has also become possible to cope with environmental changes such as temperature differences. [Means for solving the problem] An appropriate amount of annular gap is provided between the outer diameter of the protrusion of the rotor and the inner diameter of the supply body, and a fluorine-based material is added to the outer diameter of the protrusion of the rotor or the inner diameter of the supply body in the annular gap. By coating with resin, the above-mentioned problems of the prior art are solved. [Embodiment] A rotary air cylinder as an embodiment of the present invention will be described in detail below with reference to FIG. A protrusion 22 of a rotary body 26 containing a reciprocating piston 21, and a passage 24 for supplying air to the piston 21 in the rotor, which penetrates the protrusion and is supported by a bearing 23. In a rotary air cylinder having a supply body 25 of a stationary part 27, as shown in the partially enlarged view of FIG. In order to obtain a final annular gap 13 that reduces air leakage without unnecessarily increasing accuracy and eliminates the need for a large-capacity compressor, for example, when the ambient temperature is 20°C, the initial annular gap 14 is set to 50 μm. The supply body 25 is processed as follows.
The inner diameter 12 of the rotor and/or the outer diameter 11 of the protrusion of the rotating body are coated with fluororesin 15 to a thickness of 10 to 20 μm to form a final annular gap 13 of approximately 10 μm. If the final annular gap 13 disappears due to material contraction due to the difference in ambient temperature, it will not seize at the beginning of rotation due to the characteristics of the fluororesin 15, namely, low coefficient of friction, self-lubricating property, non-welding property, and heat resistance. Moreover, since the supply body 27 and the rotary body 26 are supported by the bearing 23, the third
As shown in the figure, the amount of contact is determined by the so-called cold flora of the fluororesin 31 (deformation of the molded product due to pressure), which causes the fluororesin in the contact area to move to the non-contact area, or to form an annular shape. It protrudes from the gap, and in the end, a non-contact state can be achieved with the smallest annular gap, so there will be no seizure. Even if it is not possible to provide an appropriate amount of annular gap from the beginning between the outer diameter of the protruding part of the rotating body and the inner diameter of the supply body due to poor machining accuracy of concentricity or radial gap of the bearing, the above-mentioned characteristics of fluororesin can be used. That is, it does not seize due to its low coefficient of friction, self-lubricating properties, non-welding properties, and heat resistance.
本発明は、上記のように構成したものであって。
流体漏れを減少させ、流体がエアである場合にはエア漏
れを減少させることにより、容量の大きなコンプレッサ
を不要としつつ、フッ素系樹脂の前記特性を利用して焼
付きを防止するものである。
これにより、気温等の環状変化による環状スキマが大き
くなったり、小さくなったりすることによる前記弊害、
即ち流圧漏れの焼付の発生がなくなり、また流体用回転
継手を高速回転させる際に大きな障害となっていた流体
漏れ、焼付の発生、流体用回転継手の温度上昇という諸
問題点を同時に解決したものであって、工作機械メーカ
の要望に対処し得る高速回転可能な流体用回転継手の開
発を可能にするものである。
さらに、焼付いた部品を交換する必要がなくなるので、
メンテナンスが不用となり、ユーザに対し取扱いも簡単
な流体用回転継手を提供することができるという副次的
効果も生ずるものである。The present invention is configured as described above. By reducing fluid leakage, and reducing air leakage when the fluid is air, a large-capacity compressor is not required, and the properties of fluororesin are utilized to prevent seizure. As a result, the above-mentioned adverse effects due to the annular gap becoming larger or smaller due to annular changes in temperature, etc.
In other words, the occurrence of seizure due to fluid pressure leaks has been eliminated, and the problems of fluid leakage, seizure, and temperature rise of fluid rotary joints, which were major obstacles when rotating fluid rotary joints at high speeds, have been solved at the same time. This makes it possible to develop a fluid rotary joint capable of high-speed rotation that meets the needs of machine tool manufacturers. Additionally, there is no need to replace burned out parts.
This also has the secondary effect of requiring no maintenance and providing the user with a fluid rotary joint that is easy to handle.
第２図は、本発明の一実施例である回転エアシリンダの
断面図、第１図は、要部の部分拡大図、第３図は、要部
の態様を示す模式図である。
２２ ・・・・・・回転体の突出部
２３ ・・・・・・ベアリング
２５ ・・・・・・供給体
１１ ・・・・・・回転体の突出部外径１２ ・・・・
・・供給体内径
１４ ・・・・・・初期環状スキマ
１５ ・・・・・・ フッ素系樹脂
１３・・・・・・最終環状スキマ
特許出願人 株式会社北川鉄工所
第１図
第３図FIG. 2 is a sectional view of a rotary air cylinder according to an embodiment of the present invention, FIG. 1 is a partially enlarged view of the main part, and FIG. 3 is a schematic diagram showing the aspect of the main part. 22 ...Protrusion 23 of rotating body Bearing 25 Supply body 11 ...Protrusion outer diameter 12 of rotating body
...Inner diameter of supply body 14 ...Initial annular gap 15 ...Fluorine resin 13 ...Final annular gap Patent applicant Kitagawa Iron Works Co., Ltd. Figure 1 Figure 3
Claims (1)
グによって支えられた前記回転体内のピストンに流体を
供給する流路の穿設された供給体内径との間に適量の環
状スキマを設け、且つ前記環状スキマ部の回転体突出部
外径及び（または）供給体内径にフッ素系樹脂をコーテ
ィングしたことを特徴とした流体用回転継手。An appropriate amount of annular gap is provided between the outer diameter of the protruding part of the rotating body and the inner diameter of the supply body in which a passage is formed that penetrates the protruding part and supplies fluid to the piston in the rotary body, which is supported by a bearing. 1. A rotary joint for fluid, characterized in that the outer diameter of the rotating body protrusion and/or the inner diameter of the supply body of the annular gap are coated with a fluororesin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61164391A JPS6319488A (en) | 1986-07-11 | 1986-07-11 | Rotary joint for fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61164391A JPS6319488A (en) | 1986-07-11 | 1986-07-11 | Rotary joint for fluid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6319488A true JPS6319488A (en) | 1988-01-27 |
Family
ID=15792233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61164391A Pending JPS6319488A (en) | 1986-07-11 | 1986-07-11 | Rotary joint for fluid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6319488A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002139157A (en) * | 2000-11-07 | 2002-05-17 | Eagle Ind Co Ltd | Shaft sealing device |
| JP2005291455A (en) * | 2004-04-05 | 2005-10-20 | Kuroda Precision Ind Ltd | Rotary joint |
| JP2011501083A (en) * | 2007-10-29 | 2011-01-06 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | Coupling device for transferring media from stationary part to rotatable part |
-
1986
- 1986-07-11 JP JP61164391A patent/JPS6319488A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002139157A (en) * | 2000-11-07 | 2002-05-17 | Eagle Ind Co Ltd | Shaft sealing device |
| JP2005291455A (en) * | 2004-04-05 | 2005-10-20 | Kuroda Precision Ind Ltd | Rotary joint |
| JP2011501083A (en) * | 2007-10-29 | 2011-01-06 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | Coupling device for transferring media from stationary part to rotatable part |
| US8950786B2 (en) | 2007-10-29 | 2015-02-10 | Robert Bosch Gmbh | Coupling device for transferring a medium from a stationary part to a rotatable part |
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