JPS63246577A - Sealing device - Google Patents
Sealing deviceInfo
- Publication number
- JPS63246577A JPS63246577A JP62076350A JP7635087A JPS63246577A JP S63246577 A JPS63246577 A JP S63246577A JP 62076350 A JP62076350 A JP 62076350A JP 7635087 A JP7635087 A JP 7635087A JP S63246577 A JPS63246577 A JP S63246577A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- housing
- members
- gap
- sealing device
- 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
- 238000007789 sealing Methods 0.000 title claims abstract description 25
- 239000011553 magnetic fluid Substances 0.000 claims abstract description 11
- 230000004907 flux Effects 0.000 abstract description 6
- 239000011800 void material Substances 0.000 abstract description 4
- 230000000717 retained effect Effects 0.000 abstract 1
- 239000000696 magnetic material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Classifications
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/762—Sealings of ball or roller bearings by means of a fluid
- F16C33/763—Sealings of ball or roller bearings by means of a fluid retained in the sealing gap
- F16C33/765—Sealings of ball or roller bearings by means of a fluid retained in the sealing gap by a magnetic field
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
- F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は磁性流体を使用した密封装置に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a sealing device using magnetic fluid.
第４図は磁気ディスク装置における従来の防塵用密封装
置を示す。この密封装置はハウジングとシャフトとの間
を密封するためのものである。FIG. 4 shows a conventional dustproof sealing device for a magnetic disk device. This sealing device is for sealing between the housing and the shaft.
図において、Ｈは磁性体で造ったハウジング、Ｓは同じ
く磁性体で造ったシャフト、Ｃはシール部材である。シ
ール部材Ｃは、アキシャル方向に磁化された環状の磁石
１とこれを一体に挟持する２枚の環状のボールピース２
．３とより構成されており、両ボールピース２，３とシ
ャフトＳとの間に空隙ｇを設けてハウジング１（に固定
しである。Ｚは磁石ｌによって上記空隙ｇに発生する磁
界によって保持された磁性流体である。In the figure, H is a housing made of a magnetic material, S is a shaft also made of a magnetic material, and C is a sealing member. The seal member C includes an annular magnet 1 magnetized in the axial direction and two annular ball pieces 2 that integrally sandwich the magnet 1.
．． 3, and is fixed to the housing 1 (with a gap g between both ball pieces 2, 3 and the shaft S. Z is held by a magnetic field generated in the gap g by a magnet l). It is a magnetic fluid.
この密封装置は、ボールピース２，３を磁性体であるハ
ウジングＨに直接固定した構造虹な７ているので°、両
者２．３とＨが磁気的に短絡し、磁石１からでる磁束の
大部分がハウジングＨ＆：流れる。This sealing device has a structure in which the ball pieces 2 and 3 are directly fixed to the housing H, which is a magnetic material. Part housing H&: flows.
このため、シャフトＳとボールピース２．３との間の空
隙ｇの磁束密度が低下して磁性流体Ｚの保持力が弱くな
り、磁性流体Ｚの耐圧力が著しく低ドするという問題が
あった。For this reason, there was a problem in that the magnetic flux density in the gap g between the shaft S and the ball piece 2.3 was reduced, the holding force of the magnetic fluid Z was weakened, and the withstand pressure of the magnetic fluid Z was significantly lowered. .
この問題は、ハウジングＨをアルミニウム等の非磁性体
で造れば解決できると考えられる。しかし、これでは転
がり軸受のようにハンシングが磁性体であって、非磁性
体のハウジングをもって代えられないものには、有効な
解決策とならない。It is thought that this problem can be solved if the housing H is made of a non-magnetic material such as aluminum. However, this is not an effective solution for rolling bearings where the housing is magnetic and cannot be replaced with a non-magnetic housing.
こうしたｌ［悄から、ハウジングＨが磁性体であること
を萌提とした解決策がすでに提案されている。第５図に
示す密封装置がそれである。この装置は、シール部材Ｃ
とハウジングＨとの間に非磁性体からなるリングＲを介
装したものである。その他の構成は第４図と同じである
。In view of this problem, a solution has already been proposed in which the housing H is made of a magnetic material. This is the sealing device shown in FIG. This device has a seal member C
A ring R made of a non-magnetic material is interposed between the housing H and the housing H. The other configurations are the same as in FIG. 4.
（発明が解決しようとする問題点）
しかし、このような構造の密封装置にあっては、ハウジ
ングＨにシール部材Ｃだけでなく、リングＲも組み込ま
なければならないので、その分、材料費が高くなる。(Problem to be Solved by the Invention) However, in a sealing device having such a structure, not only the sealing member C but also the ring R must be incorporated into the housing H, so the material cost is correspondingly high. Become.
また、ハウジングＨとシール部材Ｃとの間にリングＲを
介するので、嵌め合い部が１カ所増えることになり、ボ
ールピース２，３のシャフトＳに対する位置精度が悪く
なる。すなわち、両者間の空隙ｇのシャフトｓ４つにお
ける寸法にバラツキが生ずる。このため、例えば、第６
図に示すような磁気ディスク装置の軸受の内輪４と外輪
５の間に、シール部材ＣとリングＲを組み込んで、ボー
ル６の潤滑部を密封しようとする場合などには、上記両
輪４．５の間隔か２１１ＩＩｉ程度と極めて狭いため、
両部材Ｃ，Ｒを精度よく取り付けることが困難であった
。一定の精度を得ようとすれば、ボールピース２，３と
リンクＲの加工精度を上げなければならず、製造コスト
が高くついた。Further, since the ring R is interposed between the housing H and the seal member C, the number of fitting parts increases by one, and the positional accuracy of the ball pieces 2 and 3 with respect to the shaft S deteriorates. That is, variations occur in the dimensions of the gap g between the four shafts s. For this reason, for example, the sixth
When a seal member C and a ring R are installed between an inner ring 4 and an outer ring 5 of a bearing of a magnetic disk drive as shown in the figure to seal the lubricating part of a ball 6, the two wheels 4. Because the interval is extremely narrow, about 211IIi,
It was difficult to accurately attach both members C and R. In order to obtain a certain level of precision, the processing precision of the ball pieces 2 and 3 and the link R must be increased, resulting in high manufacturing costs.
この発明は、上記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、スペースの狭小なところでも容易に
、しかも精度よく取り付けることができる安価な密封装
置を得ることを目的とする。This invention was made to solve the above-mentioned conventional problems, and aims to provide an inexpensive sealing device that can be easily and accurately installed even in a narrow space.
（問題点を解決するための手段）
この発明に係る密封装置は、−・定の間隔をもって相対
移動する第１磁性部材と第２＆ｆｉ性部材との間に取り
付けて両部材間を密封する装置であって、＠石とこれを
挟持する２個のボールピースとで形成され、かつ両ボー
ルピースと第２磁性部材との間に空隙を設けて第１磁性
部材に固定するシール部材と、前記空隙に磁石によって
発生する磁界によって保持する磁性流体とより構成され
。(Means for Solving the Problems) A sealing device according to the present invention is a device that is attached between a first magnetic member and a second magnetic member that move relative to each other at a certain interval to seal the two members. a sealing member formed of a @ stone and two ball pieces sandwiching the same, and fixed to the first magnetic member with a gap provided between both ball pieces and the second magnetic member; It is composed of magnetic fluid and held by a magnetic field generated by a magnet.
かつ少なくとも−・方のボールピースは、シール部材の
取付状態において、第１磁性部材との間に空隙部が形成
される大きさとしたことを特徴とするものである。At least one of the ball pieces has a size such that a gap is formed between the ball piece and the first magnetic member when the seal member is attached.
（作用）
（１）＠石によってボールピースから第１磁性部材に流
れようとする磁束は、透磁率の低い空気層よりなる空隙
部において遮られるので、ボールピースと第２６ｆｉ性
部材との間の空隙には高い磁界が発生する。このため、
磁性流体は、その高い磁界によって空隙に保持され、そ
の耐圧力は大きくなる。(Function) (1) Since the magnetic flux that attempts to flow from the ball piece to the first magnetic member by the stone is blocked in the gap formed by the air layer with low magnetic permeability, the magnetic flux between the ball piece and the 26th magnetic member is blocked by the stone. A high magnetic field is generated in the air gap. For this reason,
The magnetic fluid is held in the air gap by its high magnetic field, increasing its withstand pressure.
（２）第１磁性部材とボールピースとの間を流れる磁束
を、空隙部で遮るようにしたので、従来、そのために使
用していた非磁性リングが不要となり、その公使用部材
が減り、コスト削減が可能になる。(2) Since the magnetic flux flowing between the first magnetic member and the ball piece is blocked by the gap, the non-magnetic ring that was conventionally used for this purpose is no longer required, reducing the number of commonly used parts and reducing costs. reduction becomes possible.
（３）従来の非磁性リングが不要となるので、使用部材
が減り、シール部材の第１磁性部材への取り付けが容易
になる。特に、第１．第２の両磁性部材の間隔が技手な
場合に容易である。(3) Since the conventional non-magnetic ring is not required, the number of members used is reduced, and attachment of the seal member to the first magnetic member is facilitated. In particular, the first. This is easy if the distance between the second magnetic members is a certain distance.
（４）また、従来の非磁性リングが不要となるので、シ
ール部材の第１磁性部材への取り付け精度は、両部材の
間で一義的に決まることになる。このため、上述のよう
に、第１．第２両部材の間隔が技手な場合でも、両者間
にシール部材を精度よ〈取り付けることができる。(4) Furthermore, since the conventional non-magnetic ring is no longer necessary, the precision with which the sealing member is attached to the first magnetic member is uniquely determined between the two members. For this reason, as mentioned above, the first. Even if the distance between the second and second members is not precise, it is possible to attach the sealing member between the two members with high precision.
〔実施例） 以−ド、この発明の実施例を第１図によって説明する。〔Example) An embodiment of the present invention will now be described with reference to FIG.
図において、Ｈ，Ｓ、Ｚ、ｇは第４図の従来例における
と同一部分を示す。このうち、Ｈはハウジングで、この
発明における第１磁性部材、Ｓはシャフトで、この発明
における第２磁性部材である。Ｃ０はシール部材で、ア
キシャル方向に磁化された環状のｖＡＡｌＩ３、この磁
石１１を一体に挟持する２個の環状のボールピース１２
．１３とで構成されている。一方のボールピース１２は
、シール部材ＣＩのハウシングＨへの取り付け状態にお
いて、そのハウジングＨとの間に空隙部Ｇが形成される
大きさにしである。したかって、ボールピース１２は、
他方のボールピース１３と比べた場合、その幅方−向に
おいて外径側が幅ａだけ狭くし°Ｃある。In the figure, H, S, Z, and g indicate the same parts as in the conventional example of FIG. 4. Among these, H is a housing, which is the first magnetic member in this invention, and S is a shaft, which is a second magnetic member in this invention. C0 is a sealing member, which includes an annular vAAlI3 magnetized in the axial direction, and two annular ball pieces 12 that integrally sandwich this magnet 11.
．． It consists of 13. One ball piece 12 has a size such that a gap G is formed between the seal member CI and the housing H when the seal member CI is attached to the housing H. Therefore, the ball piece 12 is
When compared with the other ball piece 13, the outer diameter side is narrower by the width a in the width direction.
次に上記構成に基〈作用を説明する。Next, the operation will be explained based on the above configuration.
磁石１１によってボールピース１２からハウシンクＨに
ｌｆＬれようと−４−る磁束は、空隙部Ｇにおいて遮ら
れるので、ボールピース１２，１３とシャフトＳとの間
の空隙ｇには高い磁界が発生ずる。The magnetic flux trying to flow from the ball piece 12 to the housing sink H by the magnet 11 is blocked in the gap G, so a high magnetic field is generated in the gap g between the ball pieces 12, 13 and the shaft S. .
磁性流体Ｚは、この高い磁界によって空隙ｇに強く保持
される。この点は、第５図に示す従来例の場合と同様で
ある。The magnetic fluid Z is strongly held in the air gap g by this high magnetic field. This point is similar to the conventional example shown in FIG.
上記空隙部Ｇは、従来例における非磁性体からなるリン
グＲに、実質的に相当するものである。The gap G substantially corresponds to the ring R made of a non-magnetic material in the conventional example.
したかって、この実施例の場合、上記リングＲを使用す
る必要がない。このため、使用部材か減り、材料費の節
減かり能になる。また、部材が減った分だけ、ハウジン
グＨへの取り付け工数が減り、取り付け紡くなる。特に
、第３図に示す軸受のように、外輪（第１Ｗｌ性部材）
１４と内輪（第２磁性部材）１５の間隔が狭小な場合に
取り付け易くなる。なお、１６はボールである。Therefore, in this embodiment, there is no need to use the ring R described above. Therefore, the number of parts used is reduced, and material costs can be reduced. Moreover, the number of man-hours required for attaching the housing H to the housing H is reduced as the number of members is reduced. In particular, as in the bearing shown in Fig. 3, the outer ring (first Wl member)
The attachment becomes easier when the distance between 14 and the inner ring (second magnetic member) 15 is narrow. Note that 16 is a ball.
さらに、シール部材ＣのハウジングＨへの取り付け精度
は、両部材Ｃ，Ｈの間で一人的に決まるので、上述の軸
受のように、狭小な内輪１４と外輪１５の間ても、シー
ル部材Ｃを精度よく取り付けることができる。Furthermore, since the accuracy with which the seal member C is attached to the housing H is determined solely between the two members C and H, the seal member C can be installed accurately.
第２図は他の実施例を示す。FIG. 2 shows another embodiment.
この実施例は、第１図におけるボールピース１３を一方
のボールピース１２と同じ大きさに形成したシール部材
Ｃ２を使用し、両ボールピース１２．１３とハウジング
Ｈとの間に空隙部Ｇを設けた例である。なお、ｋはボー
ルピース１２とハウジングＨとの間に介装した非磁性の
間座である６作用効果はＦ記実施例におけると異ならな
い。ただ、この実施例は、空隙部Ｇを両方のボールピー
ス１２，１３とハウジングＨの間に設けられるようにし
たので、磁性流体Ｚの保持力を大きくする」二で優れて
いる。In this embodiment, a seal member C2 is used in which the ball piece 13 in FIG. 1 is formed to have the same size as one of the ball pieces 12, and a gap G is provided between both ball pieces 12. This is an example. Incidentally, k is a non-magnetic spacer interposed between the ball piece 12 and the housing H. 6 Functions and effects are the same as in the embodiment F. However, this embodiment is superior in that the gap G is provided between both ball pieces 12, 13 and the housing H, so that the holding force of the magnetic fluid Z is increased.
〔発明の効果）
以上説明したように、この発明によれば、第２磁性部材
に対し・一定の間隔をもって相対移動する第１磁性部材
に、シール部材を取り付ける場合、そのボールピースと
第１磁性部材との間に空隙部を設けるようにしたので、
第１．第２両部材の間隔が狭小な場合でも８紡に、しか
も精度よく取り付けることができ、かつ安価な密封装置
を得ることができる。[Effects of the Invention] As explained above, according to the present invention, when the seal member is attached to the first magnetic member that moves relative to the second magnetic member at a constant interval, the ball piece and the first magnetic member Since we created a gap between the parts,
1st. Even when the distance between the second members is narrow, the sealing device can be attached to 8 spindles with high accuracy, and an inexpensive sealing device can be obtained.
ｉｔ図はこの発明の実施例を示す断面図、第２図は他の
実施例を示す断面図、第３図は７１図の実施例による密
封装置を軸受に適用した例を示す断面図、第４図は従来
の密封装置を示す断面図、第５図は従来の他の密封装置
を示す断面図、第６図は第５図の密封装置を軸受に適用
した例を示す断面図である。
図において２Ｈはハウジング（第１Ｍｉ性部材）、Ｓは
シャフト（第２＆ｔｉ性部材）、Ｃ＋はシール部材、１
１は磁石、１２．１３はボールピース、Ｚは磁性流体、
Ｇは空隙部である。
なお、図中、同一符号は同一・または相当部分を示す。FIG. 2 is a sectional view showing another embodiment of the invention, FIG. 3 is a sectional view showing an example in which the sealing device according to the embodiment of FIG. 71 is applied to a bearing, and FIG. 4 is a sectional view showing a conventional sealing device, FIG. 5 is a sectional view showing another conventional sealing device, and FIG. 6 is a sectional view showing an example in which the sealing device shown in FIG. 5 is applied to a bearing. In the figure, 2H is the housing (first Mi member), S is the shaft (second &ti member), C+ is the seal member, 1
1 is a magnet, 12.13 is a ball piece, Z is a magnetic fluid,
G is a void. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
性部材との間に取り付けて両部材間を密封する装置であ
って、磁石とこれを挟持する２個のボールピースとで形
成され、かつ両ボールピースと第２磁性部材との間に空
隙を設けて第１磁性部材に固定するシール部材と、前記
空隙に磁石によって発生する磁界によって保持する磁性
流体とより構成され、かつ少なくとも一方のボールピー
スは、シール部材の取り付け状態において、第１磁性部
材との間に空隙部が形成される大きさとしたことを特徴
とする密封装置。A device that is attached between a first magnetic member and a second magnetic member that move relative to each other at a constant interval to seal the two members, the device is formed of a magnet and two ball pieces that sandwich the magnet, and A sealing member fixed to the first magnetic member with a gap provided between both ball pieces and the second magnetic member, and a magnetic fluid held in the gap by a magnetic field generated by a magnet, and at least one of the balls A sealing device characterized in that the piece has a size such that a gap is formed between the piece and the first magnetic member when the seal member is attached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62076350A JPS63246577A (en) | 1987-03-31 | 1987-03-31 | Sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62076350A JPS63246577A (en) | 1987-03-31 | 1987-03-31 | Sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63246577A true JPS63246577A (en) | 1988-10-13 |
Family
ID=13602907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62076350A Pending JPS63246577A (en) | 1987-03-31 | 1987-03-31 | Sealing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63246577A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4989885A (en) * | 1988-12-23 | 1991-02-05 | Hitachi Metals, Ltd. | Magnetic fluid retainer, and shaft sealer employing same |
| JP2015065900A (en) * | 2013-09-30 | 2015-04-13 | グローブライド株式会社 | Fishing reel |
| JP2015089358A (en) * | 2013-11-06 | 2015-05-11 | グローブライド株式会社 | Bearing with magnetic fluid seal, and fishing reel equipped with bearing with magnetic fluid seal |
| JP2016189756A (en) * | 2015-03-31 | 2016-11-10 | 株式会社シマノ | Fishing reel and magnetic seal mechanism for the same |
| WO2017090778A1 (en) * | 2015-11-26 | 2017-06-01 | グローブライド株式会社 | Ferrofluid seal-equipped bearing |
| JP2019050830A (en) * | 2018-12-12 | 2019-04-04 | 株式会社シマノ | Fishing reel and magnetic seal mechanism for the same |
-
1987
- 1987-03-31 JP JP62076350A patent/JPS63246577A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4989885A (en) * | 1988-12-23 | 1991-02-05 | Hitachi Metals, Ltd. | Magnetic fluid retainer, and shaft sealer employing same |
| JP2015065900A (en) * | 2013-09-30 | 2015-04-13 | グローブライド株式会社 | Fishing reel |
| JP2015089358A (en) * | 2013-11-06 | 2015-05-11 | グローブライド株式会社 | Bearing with magnetic fluid seal, and fishing reel equipped with bearing with magnetic fluid seal |
| US9797451B2 (en) | 2013-11-06 | 2017-10-24 | Globeride, Inc. | Magnetic fluid sealed bearing and fishing reel having the magnetic fluid sealed bearing |
| JP2016189756A (en) * | 2015-03-31 | 2016-11-10 | 株式会社シマノ | Fishing reel and magnetic seal mechanism for the same |
| WO2017090778A1 (en) * | 2015-11-26 | 2017-06-01 | グローブライド株式会社 | Ferrofluid seal-equipped bearing |
| JP2017096451A (en) * | 2015-11-26 | 2017-06-01 | グローブライド株式会社 | Bearing with magnetic fluid seal |
| CN108291581A (en) * | 2015-11-26 | 2018-07-17 | 古洛布莱株式会社 | Bearing with magnetic fluid seal |
| US20180355911A1 (en) * | 2015-11-26 | 2018-12-13 | Globeride, Inc. | Magnetic fluid sealed bearing |
| EP3382224A4 (en) * | 2015-11-26 | 2019-03-27 | Globeride, Inc. | Ferrofluid seal-equipped bearing |
| US10520034B2 (en) | 2015-11-26 | 2019-12-31 | Globeride, Inc. | Magnetic fluid sealed bearing |
| JP2019050830A (en) * | 2018-12-12 | 2019-04-04 | 株式会社シマノ | Fishing reel and magnetic seal mechanism for the same |
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