JPS6272920A - Spindle - Google Patents

Spindle

Info

Publication number
JPS6272920A
JPS6272920A JP21229485A JP21229485A JPS6272920A JP S6272920 A JPS6272920 A JP S6272920A JP 21229485 A JP21229485 A JP 21229485A JP 21229485 A JP21229485 A JP 21229485A JP S6272920 A JPS6272920 A JP S6272920A
Authority
JP
Japan
Prior art keywords
housing
magnetic
shaft
magnetic fluid
magnet
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
Application number
JP21229485A
Other languages
Japanese (ja)
Inventor
Shigeki Matsunaga
茂樹 松永
Akio Fujii
章雄 藤井
Shinichi Shirota
伸一 城田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NSK Ltd
Original Assignee
NSK Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NSK Ltd filed Critical NSK Ltd
Priority to JP21229485A priority Critical patent/JPS6272920A/en
Publication of JPS6272920A publication Critical patent/JPS6272920A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To prevent generation of precession movement and eccentric rotation of a sindle or a housing and reduce the amount of magnetic fluid by inserting a non-magnetic spindle into a non-magnetic housing, forming a radial bearing portion therebetween, providing the magnetic fluid in the space between the bearing portion and the housing or the spindle and providing magnets for holding the magnetic fluid. CONSTITUTION:There are provided on the inner periphery of a non-magnetic housing 11 annular magnetic poll pieces 13 to form a radial bearing portion, and two annular first magnets 14 having N and S poles are disposed between the poll pieces 13 with a spacer 15 interposed therebetween. A second magnet 17 is provided on the bottom of the housing 11 to form a thrust bearing portion of a non-magnetic spindle 16, and magnetic fluid 18 is interposed between the spindle 16 and the poll pieces 13 and the second magnet 17. This permits the magnetic fluid 18 to be held in a uniform thickness on the inner periphery of the poll pieces 13 and to function as a lubricant between the second magnet 17 and the spindle 16. Therefore, the spindle 16 or the housing 11 can be prevented from precession movement and eccentric rotation, and the required amount of the magnetic fluid is reduced.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明はスピンドルに関し、特に、軸受部と回転軸ま
たはハウジングとの間に漏洩磁束によって磁性流体を保
持し、これを潤滑剤として用いたスピンドルに関するも
のである。
Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a spindle, and in particular to a spindle in which a magnetic fluid is held between a bearing portion and a rotating shaft or a housing by leakage magnetic flux, and this is used as a lubricant. It is related to.

〔従来の技術〕[Conventional technology]

このようなスピンドルについては、特開昭60−882
23号において1つの提案がなされている。第5図に示
すものがそれである。
Regarding such a spindle, Japanese Patent Application Laid-Open No. 60-882
One proposal is made in No. 23. This is shown in FIG.

図において、1は非磁性体のハウジング、2は開口部2
aを広くとってハウジングlに明けためくら穴で、2b
はラジアル軸受部、2cはスラスト軸受部である。3は
磁石4とポールピース5とよりなるシール部材、6は透
磁性の軸、7は軸6とめくら穴2およびシール部材3と
の間に充填された磁性流体である。
In the figure, 1 is a non-magnetic housing, 2 is an opening 2
Make a wider hole and make a blind hole in the housing l, then 2b
2c is a radial bearing portion, and 2c is a thrust bearing portion. Reference numeral 3 indicates a sealing member consisting of a magnet 4 and a pole piece 5, 6 a magnetically permeable shaft, and 7 a magnetic fluid filled between the shaft 6, the blind hole 2, and the sealing member 3.

このスピンドルにおいては、磁石4の磁束がポールピー
ス5と軸6との間隙を横切り、ハウジング1と軸6とシ
ール部材3の間に磁束線が形成されるので、上記間隙g
1に磁性流体7が保持され、これが磁性流体シールとし
て機能する。したがって、ラジアル軸受部2bとスラス
ト軸受部2C部分に充填した磁性流体7は、軸6が回転
しても散逸するおそれはない。
In this spindle, the magnetic flux of the magnet 4 crosses the gap between the pole piece 5 and the shaft 6, and magnetic flux lines are formed between the housing 1, the shaft 6, and the seal member 3, so that the gap g
1 holds a magnetic fluid 7, which functions as a magnetic fluid seal. Therefore, there is no risk that the magnetic fluid 7 filled in the radial bearing portion 2b and the thrust bearing portion 2C will dissipate even when the shaft 6 rotates.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

しかしながら、この提案にかかるスピンドルにあっては
、上述のようにハウジングlおよびシール部材3と軸6
との間に磁性流体7を充填し、これを磁石4の磁束を利
用して間隙g1部分で保持した磁性流体7によってシー
ルする構造となっているので、軸6とラジアル軸受部2
bおよびスラスト軸受部2cとの間は、単なるすベリ軸
受となってしまう、このため、つぎのような問題があっ
た。
However, in the spindle according to this proposal, as described above, the housing l, the seal member 3 and the shaft 6 are
The structure is such that a magnetic fluid 7 is filled between the shaft 6 and the radial bearing part 2, and this is sealed by the magnetic fluid 7 held in the gap g1 using the magnetic flux of the magnet 4.
b and the thrust bearing portion 2c is simply a sliding bearing, which causes the following problem.

(1)軸6を鉛直方向に取り付けた場合でも、これが偏
荷重を受けると、めくら穴2の中で間隙gによって傾い
て歳差運動をする。
(1) Even if the shaft 6 is installed vertically, if it receives an uneven load, it will tilt and precess within the blind hole 2 due to the gap g.

(2)軸6を鉛直方向から傾けたり、あるいは水平に取
り付けたりすると、これがめくら穴2の中で間隙gによ
って傾くか、あるいは偏って偏心回転する。
(2) If the shaft 6 is tilted from the vertical direction or installed horizontally, it will tilt or eccentrically rotate due to the gap g in the blind hole 2.

(3)ラジアル軸受部2bとスラスト軸受部2c以外の
潤滑を要しない部分にも磁性流体7が一様に充填される
ので、高価な磁性流体の使用量が多くなり、コスト高に
なる。
(3) Since the magnetic fluid 7 is uniformly filled in parts other than the radial bearing part 2b and the thrust bearing part 2c that do not require lubrication, the amount of expensive magnetic fluid used increases, leading to high costs.

この発明は、このような従来の問題点を解決するために
なされたもので、軸またはハウジングが歳差運動や偏心
回転を起こすおそれがなく、かつ、磁性流体の使用量が
少なくて済むスピンドルを提供することを目的とする。
This invention was made in order to solve these conventional problems, and provides a spindle that does not cause the risk of precession or eccentric rotation of the shaft or housing, and that uses less magnetic fluid. The purpose is to provide.

〔問題点を解決するための手段〕[Means for solving problems]

この発明に係るスピンドルは、軸方向にめくら穴を有す
る非磁性体のハウジングと、めくら穴に挿入した非磁性
体の軸と、ハウジングの内周面または軸の廻りに形成し
たラジアル軸受部と、ラジアル軸受部とハウジングまた
は軸との間隙に磁性流体を保持する磁石と、ラジアル軸
受部と軸またはハウジングとの間隙に介在させた磁性流
体とを備えたものである。
The spindle according to the present invention includes a non-magnetic housing having a blind hole in the axial direction, a non-magnetic shaft inserted into the blind hole, and a radial bearing portion formed on the inner peripheral surface of the housing or around the shaft. It includes a magnet that holds a magnetic fluid in the gap between the radial bearing and the housing or the shaft, and a magnetic fluid that is interposed in the gap between the radial bearing and the shaft or the housing.

〔作用〕[Effect]

磁石の漏洩磁束がラジアル軸受部の周囲に生じ、ラジア
ル軸受部の内周面、すなわち、ラジアル軸受部とその近
傍に磁性流体が軸方向と円周方向に均一な厚さで保持さ
れ、潤滑剤として機能する。
Leakage magnetic flux of the magnet is generated around the radial bearing part, and the magnetic fluid is held on the inner peripheral surface of the radial bearing part, that is, in the radial bearing part and its vicinity, with a uniform thickness in the axial and circumferential directions, and the lubricant functions as

したがって、鉛直方向に取り付けた軸またはハウジング
が偏荷重を受けて偏心ないし傾こうとしても、ラジアル
軸受部に保持されている磁性流体の復元力、つまり軸方
向と円周方向に均一な厚さを維持しようとする力によっ
て求心作用を受けるので、歳差運動を起こすおそれはな
い、また、軸またはハウジングは、これを傾けたり、あ
るいは水平にして取り付けたりしても、同様に、求心作
用を受けるので、ハウジングまたは軸に対して偏心回転
をするおそれはない。
Therefore, even if the vertically installed shaft or housing receives an eccentric load and tends to become eccentric or tilt, the restoring force of the magnetic fluid held in the radial bearing section, that is, the uniform thickness in the axial and circumferential directions, can be maintained. There is no risk of precession because the shaft or housing is subjected to centripetal action by the force that is trying to maintain it, and even if the shaft or housing is tilted or installed horizontally, it will still be subject to centripetal action. Therefore, there is no risk of eccentric rotation with respect to the housing or shaft.

さらに、磁性流体は、磁石によってラジアル軸受部とそ
の近傍に保持される量だけあればよいから、磁性波体を
多量に使用する必要はなく、コストが安くなる。
Furthermore, since the magnetic fluid only needs to be in an amount that can be held in the radial bearing portion and its vicinity by the magnet, there is no need to use a large amount of magnetic wave body, and the cost is reduced.

〔実施例〕〔Example〕

第1図はこの発明の第1実施例を示す。 FIG. 1 shows a first embodiment of the invention.

図において、11は非磁性体のハウジング、12はハウ
ジング11に明けためくら穴、13はハウジング11の
内周面に一体に固着した環状の磁性体からなるポールピ
ース、すなわちラジアル軸受部である。14はポールピ
ース13の間に一体に嵌着した環状の第1磁石で、厚さ
方向、すなわちハウジング11の軸方向にN、S極を有
する磁石である。第1磁石14をはさんだ2個のポール
ピース13で1つのラジアル軸受部が形成され、この軸
受部が間座15をはさんで、つまり間隔をおいて2個所
設けである。16は非磁性体の軸、17はハウジング1
1に埋設され、めくら穴12の底部を形成する第2磁石
で、軸16の軸方向にN、S極を有する磁石である。上
記磁石17は、この実施例では、同時にスラスト軸受部
として機能する。18はポールピース13と軸16との
間隙g2、および軸16の端部16aとめくら穴12の
底部、すなわち:52磁石17との間隙g3またはそれ
らの近傍に介在させた磁性流体である。
In the figure, 11 is a non-magnetic housing, 12 is a blind hole drilled in the housing 11, and 13 is a pole piece made of an annular magnetic material that is integrally fixed to the inner peripheral surface of the housing 11, that is, a radial bearing portion. A first annular magnet 14 is fitted integrally between the pole pieces 13, and has N and S poles in the thickness direction, that is, in the axial direction of the housing 11. One radial bearing section is formed by the two pole pieces 13 that sandwich the first magnet 14, and these bearing sections are provided at two locations with spacers 15 in between, that is, at intervals. 16 is a non-magnetic shaft, 17 is the housing 1
The second magnet is embedded in the blind hole 12 and forms the bottom of the blind hole 12, and is a magnet having N and S poles in the axial direction of the shaft 16. In this embodiment, the magnet 17 also functions as a thrust bearing. Reference numeral 18 denotes a magnetic fluid interposed in the gap g2 between the pole piece 13 and the shaft 16, and in the gap g3 between the end 16a of the shaft 16 and the bottom of the blind hole 12, that is, the :52 magnet 17, or in the vicinity thereof.

つぎに作用を説明する。Next, the effect will be explained.

第1磁石14の漏洩磁束によってポールピース13の内
周面、つまりラジアル軸受部とその近傍に磁性流体18
が軸方向と円周方向に均一な厚さで保持され、軸16と
の間で潤滑剤として機能する。また同様に、第2磁石1
7の漏洩磁束によって、第2磁石17つまり、スラスト
軸受部とその近傍に磁性流体18が保持され、軸16と
の間で潤滑剤として機能する。
Due to the leakage magnetic flux of the first magnet 14, the magnetic fluid 18 is applied to the inner circumferential surface of the pole piece 13, that is, the radial bearing portion and its vicinity.
is maintained at a uniform thickness in the axial and circumferential directions, and functions as a lubricant between the shaft 16 and the shaft 16. Similarly, the second magnet 1
Due to the leakage magnetic flux 7, the magnetic fluid 18 is held in the second magnet 17, that is, in the thrust bearing portion and its vicinity, and functions as a lubricant between the second magnet 17 and the shaft 16.

したがって、第1図のように、鉛直方向に取り付けた軸
16が偏荷重を受けても、磁性流体18の復元力、つま
り、軸方向と円周方向に均一な厚さを維持しようとする
力によって求心作用を受けることになるから、歳差運動
または偏心回転を起こすおそれはない。また、軸16は
、これを傾けたり、あるいは水平にしたりして取り付け
ても、同様に、求心作用を受けるから、ハウジング11
に対して偏心回転するおそれはない。
Therefore, as shown in FIG. 1, even if the vertically attached shaft 16 receives an uneven load, the restoring force of the magnetic fluid 18, that is, the force that tries to maintain a uniform thickness in the axial and circumferential directions. Since it receives centripetal action, there is no risk of precession or eccentric rotation. Further, even if the shaft 16 is installed tilted or horizontally, it will similarly receive centripetal action, so the housing 11
There is no risk of eccentric rotation.

さらに、ラジアル軸受部とスラスト軸受部の潤滑は、そ
れらの軸受部とその近傍に保持された磁性流体18で可
能となるから、従来に比較してその使用量は格段に少量
で済み、コスト的に有利である。
Furthermore, since the radial bearing and thrust bearing can be lubricated by the magnetic fluid 18 held in and near these bearings, the amount used is much smaller than in the past, reducing costs. It is advantageous for

この実施例ではスラスト軸受部に第211i石17を設
け、磁性流体18を潤滑剤として用いたが、スラスト軸
受部は磁石17を使用しないで単なる軸端部とハウジン
グ底部との組合せでもよく、この場合は一般の潤滑油を
用いることが出来る。
In this embodiment, the 211i stone 17 was provided in the thrust bearing part and the magnetic fluid 18 was used as a lubricant, but the thrust bearing part may be simply a combination of the shaft end and the housing bottom without using the magnet 17. If so, a general lubricant can be used.

第2図は第2実施例を示す。FIG. 2 shows a second embodiment.

第1図と同一ないし相当部分には同符号が付しである。The same or corresponding parts as in FIG. 1 are given the same reference numerals.

この実施例の構成は、第1実施例との比較で言えば、ラ
ジアル軸受部としての磁性体のポールピース13と第1
磁石14を軸16に一体に固着して設けた点と、第1磁
石14をはさんだ5個のポールピース13で1つのラジ
アル軸受部が形成されてポールピースの外周部で磁性流
体18を保持している点で、第1実施例と異なる。
In comparison with the first embodiment, the configuration of this embodiment is that the magnetic pole piece 13 and the first
The fact that the magnet 14 is integrally fixed to the shaft 16 and the five pole pieces 13 sandwiching the first magnet 14 form one radial bearing part, and the magnetic fluid 18 is held on the outer periphery of the pole pieces. This embodiment differs from the first embodiment in that

第11a石14のように環状の磁石は、磁束密度が外周
側が内周側に比べて高い、従って、fJS2実施例の場
合は、磁性流体18の保持力がつよくなり、磁性流体1
8を円周上で均一に保持する性能が向上し、その結果、
求心力が高くなる。尚、スラスト軸受部は第1実施例と
同様、磁石を使用しないで、潤滑油として一般の潤滑油
を用いることが出来る。
In an annular magnet like the No. 11a stone 14, the magnetic flux density is higher on the outer circumferential side than on the inner circumferential side. Therefore, in the case of the fJS2 embodiment, the holding force of the magnetic fluid 18 is strong, and
The ability to hold 8 uniformly on the circumference has improved, and as a result,
Centripetal force increases. Incidentally, as in the first embodiment, the thrust bearing part does not use a magnet, and general lubricating oil can be used as the lubricating oil.

第3図は第3実施例を示す。FIG. 3 shows a third embodiment.

第2図と同一ないし相当部分には同符号が付しである。The same or corresponding parts as in FIG. 2 are given the same reference numerals.

この実施例は、第2実施例との比較で言えば、ラジアル
軸受部13を軸16の周囲に、軸方向に平行に一体形成
した点、第111!!石14を嵌着した上記ラジアル軸
受部13で1つのラジアル軸受部が形成されている点お
よび第2磁石17が装着されていない点で、第2実施例
と異なる。
In comparison with the second embodiment, this embodiment has the 111th point in that the radial bearing portion 13 is integrally formed around the shaft 16 in parallel to the axial direction! ! This embodiment differs from the second embodiment in that one radial bearing section is formed by the radial bearing section 13 to which the stone 14 is fitted, and that the second magnet 17 is not attached.

すなわち、ラジアル軸受部工3は軸16と同材質で、非
磁性体である。第1磁石14は棒状であって、その嵌着
状態において、軸16の径方向にN、S極を有する磁石
である。
That is, the radial bearing part work 3 is made of the same material as the shaft 16, and is non-magnetic. The first magnet 14 is rod-shaped and has N and S poles in the radial direction of the shaft 16 in the fitted state.

i11磁14の漏洩磁束によってラジアル軸受部13お
よびその近傍に磁性流体18が保持される。この実施例
で第2磁石17を必要としないのは、第1磁石14の漏
洩磁束で軸16の端部、つまり、スラスト軸受部に磁性
流体18を充分に保持できるからである。
The magnetic fluid 18 is held in the radial bearing part 13 and its vicinity by the leakage magnetic flux of the i11 magnet 14. The reason why the second magnet 17 is not required in this embodiment is that the leakage magnetic flux of the first magnet 14 can sufficiently hold the magnetic fluid 18 at the end of the shaft 16, that is, at the thrust bearing portion.

作用効果は、第1実施例と異なるところはない。なお、
ハウジング11側にラジアル軸受部13を形成する構成
としてもよい。
The operation and effect are the same as those of the first embodiment. In addition,
The radial bearing portion 13 may be formed on the housing 11 side.

尚、以に説明した実施例ではハウジングは一体的に加工
されためくら穴であるが、ハウジング底部を別体加工し
た蓋体としてハウジングに取付けてめくら穴としてもよ
い。
In the embodiment described above, the housing has a blind hole that is integrally machined, but the bottom of the housing may be separately machined and attached to the housing as a lid body to form a blind hole.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、この発明によれば、磁石の漏洩磁
束によって磁性流体をラジアル軸受部に保持する構成と
したから、軸またはハウジングが歳差運動や偏心回転を
起こすおそれはなく、また、磁性流体の使用量も少なく
て済むという効果が得られる。
As explained above, according to the present invention, since the magnetic fluid is held in the radial bearing part by the leakage magnetic flux of the magnet, there is no risk of the shaft or housing causing precession or eccentric rotation, and the magnetic The effect is that the amount of fluid used can be reduced.

【図面の簡単な説明】[Brief explanation of drawings]

:51図はこの発明の第1実施例の断面図、第2図は同
じく第2実施例の断面図、第3図は同じく第3実施例の
断面図、第4図は第3図における軸の断面図、第5図は
従来のスピンドルの断面図である。 図中、11はハウジング、12はハウジング11のめく
ら穴、13はラジアル軸受部(ポールピース)、14は
第1磁石、15は間座、16は軸、17は第2&i石、
18は磁性流体である。なお1各図において同符号は同
一ないし相当部分を示す。 第1因 第2図
: Figure 51 is a sectional view of the first embodiment of this invention, Figure 2 is a sectional view of the second embodiment, Figure 3 is a sectional view of the third embodiment, and Figure 4 is the axis in Figure 3. FIG. 5 is a cross-sectional view of a conventional spindle. In the figure, 11 is a housing, 12 is a blind hole in the housing 11, 13 is a radial bearing part (pole piece), 14 is a first magnet, 15 is a spacer, 16 is a shaft, 17 is a second &i.
18 is a magnetic fluid. Note that in each figure, the same reference numerals indicate the same or corresponding parts. First cause Figure 2

Claims (1)

【特許請求の範囲】[Claims] 軸方向にめくら穴を有する非磁性体のハウジングと、め
くら穴に挿入した非磁性体の軸と、ハウジングの内周面
または軸の廻りに形成したラジアル軸受部と、ラジアル
軸受部とハウジングまたは軸との間隙に磁性流体を保持
する磁石と、ラジアル軸受部と軸またはハウジングとの
間隙に介在させた磁性流体とを有するスピンドル。
A non-magnetic housing having a blind hole in the axial direction, a non-magnetic shaft inserted into the blind hole, a radial bearing formed on the inner peripheral surface of the housing or around the shaft, and a radial bearing and the housing or shaft. A spindle having a magnet for holding a magnetic fluid in a gap between the radial bearing part and the shaft or the housing, and a magnetic fluid interposed in the gap between the radial bearing part and the shaft or the housing.
JP21229485A 1985-09-27 1985-09-27 Spindle Pending JPS6272920A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21229485A JPS6272920A (en) 1985-09-27 1985-09-27 Spindle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21229485A JPS6272920A (en) 1985-09-27 1985-09-27 Spindle

Publications (1)

Publication Number Publication Date
JPS6272920A true JPS6272920A (en) 1987-04-03

Family

ID=16620200

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21229485A Pending JPS6272920A (en) 1985-09-27 1985-09-27 Spindle

Country Status (1)

Country Link
JP (1) JPS6272920A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010041764A (en) * 2008-07-31 2010-02-18 Doshisha Magnetic coupling

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS608523A (en) * 1983-06-27 1985-01-17 Nippon Telegr & Teleph Corp <Ntt> Magnetic fluid slide bearing structure
JPS6088223A (en) * 1983-09-21 1985-05-18 フエロフルイデイクス・コーポレイシヨン Magnetic fluid thrust and radial bearing assembly

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS608523A (en) * 1983-06-27 1985-01-17 Nippon Telegr & Teleph Corp <Ntt> Magnetic fluid slide bearing structure
JPS6088223A (en) * 1983-09-21 1985-05-18 フエロフルイデイクス・コーポレイシヨン Magnetic fluid thrust and radial bearing assembly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010041764A (en) * 2008-07-31 2010-02-18 Doshisha Magnetic coupling

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