JPH01153873A - Manufacture of sealing member for sealing magnetic fluid - Google Patents
Manufacture of sealing member for sealing magnetic fluidInfo
- Publication number
- JPH01153873A JPH01153873A JP62309464A JP30946487A JPH01153873A JP H01153873 A JPH01153873 A JP H01153873A JP 62309464 A JP62309464 A JP 62309464A JP 30946487 A JP30946487 A JP 30946487A JP H01153873 A JPH01153873 A JP H01153873A
- Authority
- JP
- Japan
- Prior art keywords
- pole piece
- annular
- magnetic fluid
- adhesive
- sealing
- 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
- 239000011553 magnetic fluid Substances 0.000 title claims abstract description 21
- 238000007789 sealing Methods 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000000853 adhesive Substances 0.000 claims abstract description 18
- 230000001070 adhesive effect Effects 0.000 claims abstract description 18
- 230000002093 peripheral effect Effects 0.000 abstract description 4
- 238000004073 vulcanization Methods 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000013040 rubber vulcanization Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000000465 moulding Methods 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Sealing Of Bearings (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、磁性流体シールに用いるシール部材の製造
方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a seal member used in a magnetic fluid seal.
従来の磁性流体シールとしては、磁気ディスク装置の軸
受に使用したものがある。これは、本件出願人が実開昭
５８−１９１４２３号公報において開示しているもので
ある。第６．７図に示すものがそれである。Conventional magnetic fluid seals include those used in bearings of magnetic disk drives. This is disclosed by the present applicant in Japanese Utility Model Application Publication No. 191423/1983. This is shown in Figure 6.7.
図において、１は筒状のハウジング、２はハウジング１
に軸受３を介して取り付けたシャフト、Ｃは環状の磁石
４とその両端面に接着剤で固着した環状ポールピース５
．６により形成した環状のシール部材本体７とその外周
部に一体形成したゴム環体８とよりなるシール部材であ
る。In the figure, 1 is a cylindrical housing, 2 is a housing 1
A shaft is attached to the shaft via a bearing 3, and C is an annular magnet 4 and an annular pole piece 5 fixed to both end faces of the annular magnet 4 with adhesive.
．． This is a sealing member consisting of an annular sealing member main body 7 formed by a rubber ring 8 formed integrally with the outer peripheral portion of the annular sealing member main body 7.
このシール部材Ｃは、以下の手順で製造されている。す
なわち、まず、第８図（ａ）のように、環状の磁石４の
両端面に環状のポールピース５゜６を接着剤１７で接着
して同図（ｂ）に示すシール部材本体７を造る。ついで
、このシール部材本体７に次工程で形成するゴム環体８
を接着するための接着剤１８を、同図（ｂ）のように、
塗布し、これを温度約１６５℃の下で約１０分間乾燥す
る。乾燥したところで、シール部材本体７を金型に入れ
てゴムを注入し、これを温度１９５℃、圧力数１０ Ｋ
ｇｆ／ｃｍ２の下で、約５分間加硫して、同図（Ｃ）の
ように、本体７の外周部にゴム環体８を一体形成する。This seal member C is manufactured by the following procedure. That is, first, as shown in FIG. 8(a), annular pole pieces 5.degree. 6 are adhered to both end surfaces of an annular magnet 4 with adhesive 17 to create the sealing member main body 7 shown in FIG. 8(b). . Next, a rubber ring 8 is formed on this seal member main body 7 in the next step.
As shown in the same figure (b), the adhesive 18 for bonding the
It is dried for about 10 minutes at a temperature of about 165°C. After drying, put the sealing member body 7 into a mold, inject rubber, and heat it at a temperature of 195°C and a pressure of 10K.
The rubber ring 8 is integrally formed on the outer periphery of the main body 7 by vulcanization for about 5 minutes under gf/cm2, as shown in FIG.
また、上記シール部材Ｃは、ポールピース５゜６と軸受
３の内輪９との間にギャップｇを設けて軸受３の外輪１
０の内壁面にゴム環体８の弾性力で固定しである。なお
、内輪９はシャフト２に固定され、外輪１０はハウジン
グ１に固定されている。軸受３とポールピース５，６は
磁性体よりなる。１１は上記隙間ｇに磁力によって保持
された磁性流体、すなわち、磁石４によって内輪９とシ
ール部材Ｃの間に形成された磁気回路によってキャップ
ｇに保持された磁性流体である。１２はシャフト２に嵌
着したディスク、１３は磁気ヘッド、１４はボール、１
５はボール保持器、１６はシール板である。Further, the sealing member C is configured such that a gap g is provided between the pole piece 5°6 and the inner ring 9 of the bearing 3, and the outer ring 1 of the bearing 3 is
It is fixed to the inner wall surface of 0 by the elastic force of the rubber ring 8. Note that the inner ring 9 is fixed to the shaft 2, and the outer ring 10 is fixed to the housing 1. The bearing 3 and the pole pieces 5 and 6 are made of magnetic material. Reference numeral 11 denotes a magnetic fluid held in the gap g by magnetic force, that is, a magnetic fluid held in the cap g by a magnetic circuit formed between the inner ring 9 and the seal member C by the magnet 4. 12 is a disk fitted on the shaft 2, 13 is a magnetic head, 14 is a ball, 1
5 is a ball holder, and 16 is a seal plate.
このような構成となっているので、シール部材Ｃと内輪
９の間は、両者Ｃ，９間に保持された磁性流体１１によ
ってシールされ、軸受３は外部から浸入する塵埃等から
保護される。With this configuration, the space between the seal member C and the inner ring 9 is sealed by the magnetic fluid 11 held between both C and 9, and the bearing 3 is protected from dust etc. that enter from the outside.
しかし、従来の磁性流体シールに使用されているシール
部材Ｃは、上述のように、シール部材本体７を先に造っ
ておき、これにゴム環体８を形成するという手順で製造
されているので、磁石４とポールピース５，６を接着し
ている接着剤１７が、ゴム加硫時の高熱で劣化して（通
常１４０〜１５０℃で劣化する。）部分的にはがれ、そ
の部分に隙間が生じていることがあった。However, the seal member C used in the conventional magnetic fluid seal is manufactured by the procedure of first making the seal member body 7 and then forming the rubber ring body 8 thereon, as described above. The adhesive 17 that adheres the magnet 4 and the pole pieces 5 and 6 deteriorates due to the high heat during rubber vulcanization (usually deteriorates at 140 to 150°C) and partially peels off, leaving a gap in that area. Something was happening.
このため、ギャップｇに保持されている磁性流体１１が
上記隙間に浸透して次第に減少し、シール性が低下する
とともに、シールの寿命が短くなるという問題があった
。なお、このように磁性流体１０が隙間に浸透するのは
、磁石４による磁性流体１０の保持力よりも磁性流体１
０が隙間に浸透する力の方が強いためである。Therefore, the magnetic fluid 11 held in the gap g penetrates into the gap and gradually decreases, resulting in a problem that the sealing performance is deteriorated and the life of the seal is shortened. Note that the reason why the magnetic fluid 10 penetrates into the gap in this way is that the magnetic fluid 10 penetrates into the gap more than the holding force of the magnetic fluid 10 by the magnet 4.
This is because the force of zero penetrating into the gap is stronger.
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、環状のポールピースと環状の磁石を接
着する接着剤の劣化による両者間の隙間の発生を防止で
き、したがって、磁性流体によるシール性とシール寿命
の低下を防止できる磁性流体シール用シール部材の製造
方法を提供することを目的とする。This invention was made to solve these conventional problems, and it is possible to prevent the generation of a gap between the annular pole piece and the annular magnet due to deterioration of the adhesive that adheres them. It is an object of the present invention to provide a method for manufacturing a sealing member for a magnetic fluid seal that can prevent deterioration in sealing performance and seal life due to fluid.
この発明に係るシール部材の製造方法は、環状のポール
ピースの外周部にゴムを加硫してゴム環体を一体形成し
てから、前記ポールピースに環状の磁石（必要に応じ他
のポールピース）を接着剤で接着することを特徴とする
ものである。The method for manufacturing a seal member according to the present invention includes integrally forming a rubber ring body by vulcanizing rubber on the outer periphery of an annular pole piece, and then attaching an annular magnet to the pole piece (other pole pieces as necessary). ) is bonded with adhesive.
（作用〕
環状のポールピースの外周部にゴム環体を形成してから
、同ポールピースに環状の磁石（必要に応じ他のポール
ピース）を接着するので、ポールピースと磁石を接着す
る接着剤が、上記ゴム環体形成時（ゴム加硫時）の高熱
によって劣化することはない。(Function) A rubber ring is formed on the outer periphery of the annular pole piece, and then the annular magnet (and other pole pieces if necessary) is adhered to the same pole piece, so the adhesive used to adhere the pole piece and the magnet is However, it does not deteriorate due to high heat during the formation of the rubber ring (rubber vulcanization).
以下、この発明の実施例によるシール部材の製造方法を
第１図によって工程順に説明する。Hereinafter, a method for manufacturing a seal member according to an embodiment of the present invention will be explained in order of steps with reference to FIG.
（１）まず、第１図（ａ）のように、ポールピース２１
の筒部２１ａの外周部に次工程で形成するゴム環体２３
を接着するための接着剤２２を塗布し、これを温度的１
６５℃の下で約１０分乾燥する。(1) First, as shown in Fig. 1(a), the pole piece 21
A rubber ring 23 is formed on the outer circumference of the cylindrical portion 21a in the next step.
Apply adhesive 22 to bond the
Dry at 65°C for about 10 minutes.
（２）ついで、この乾燥後のポールピース２１を金型に
入れてゴムを注入し、これを温度１９５℃、圧力数１０
Ｋｇｆ／ｃｍ２の下で、約５分間加硫して、同図（ｂ
）のように、ポールピース２１の外周部にゴム環体２３
を形成する。(2) Next, put this dried pole piece 21 into a mold, inject rubber, and press it at a temperature of 195°C and a pressure of 10
Vulcanize for about 5 minutes under Kgf/cm2, and
), a rubber ring 23 is attached to the outer periphery of the pole piece 21.
form.
（３）最後に、ゴム環体２３を形成したポールピース２
１に、同図（Ｃ）のように、環状の磁石２４と他の環状
のポールピース２５を、この順序でもって、接着剤２６
により常温下で接着する。(3) Finally, the pole piece 2 with the rubber ring 23 formed thereon.
1, as shown in FIG.
Adhere at room temperature.
同図（ｄ）は、上記工程によって製造されたシール部材
Ｃ３を示し、第２図は第７図の軸受３に同部材Ｃ３を使
用した状態を示したものである。FIG. 2(d) shows the seal member C3 manufactured by the above process, and FIG. 2 shows the same member C3 used in the bearing 3 of FIG. 7.
上述のように、この実施例においては、環状のポールピ
ース２１の外周部にゴム環体２３を一体成形してから、
同ポールピース２１に環状の磁石２４と他の環状のポー
ルピース２５を接着剤２６で接着するようにしたので、
この接着剤２６が、ゴム環体２３の成形時の高熱で劣化
することはない。As mentioned above, in this embodiment, after the rubber ring body 23 is integrally molded on the outer circumference of the annular pole piece 21,
Since the annular magnet 24 and another annular pole piece 25 are bonded to the same pole piece 21 with adhesive 26,
This adhesive 26 will not deteriorate due to high heat during molding of the rubber ring body 23.
したがって、従来のように、接着剤の劣化により、磁石
２４とポールピース２５の間に隙間が発生し、この隙間
に磁性流体１０が浸透して減少し、シール性が低下し、
シールの寿命が短くなるといった問題はなくなる。Therefore, as in the past, a gap is generated between the magnet 24 and the pole piece 25 due to the deterioration of the adhesive, and the magnetic fluid 10 penetrates into this gap and decreases, reducing the sealing performance.
The problem of shortened seal life is eliminated.
なお、この実施例の場合、ポールピース２１が筒部２１
ａを有するので、その内周面が、環状の磁石２４のポー
ルピース２１への接着工程において、同磁石２４のガイ
ド面と位置決め面になるという利点がある。In addition, in the case of this embodiment, the pole piece 21 is
a, the inner circumferential surface thereof becomes the guide surface and positioning surface of the annular magnet 24 in the process of adhering the annular magnet 24 to the pole piece 21.
第３図と第４図に示すシール部材Ｃ２と０３は、上記実
施例と同じ工程で造ったものである。Seal members C2 and 03 shown in FIGS. 3 and 4 were made in the same process as in the above embodiment.
第３図のものは、ポールピース２１の筒部２１ａ内周面
にもゴム環体２３を形成して、両者２１゜２３の一体性
を強化した例であり、第４図のものは、上記実施例のよ
うに筒部２１ａを有するポールピース２１に代えて、板
状のポールピース２７を使用した例である。The one in FIG. 3 is an example in which a rubber ring 23 is also formed on the inner circumferential surface of the cylindrical portion 21a of the pole piece 21 to strengthen the integrity of both parts 21 and 23, and the one in FIG. This is an example in which a plate-shaped pole piece 27 is used instead of the pole piece 21 having the cylindrical portion 21a as in the embodiment.
第５図のシール部材Ｃ４は、上記実施例におけるポール
ピース２５を使用しない構成のもので、第７図の軸受３
に使用した状態で示しである。これは、内、外輪９．１
０と磁石２４とポールピース２１と磁性流体１１とによ
って磁気回路を構成するのに適したものである。同部材
Ｃ４の製造方法は、上記実施例においてポールピース２
５を接着しないだけで、その他は同じである。作用効果
も上記実施例と異なるところはない。The seal member C4 in FIG. 5 has a structure that does not use the pole piece 25 in the above embodiment, and the bearing 3 in FIG.
It is shown in used condition. This is the inner and outer ring 9.1
0, the magnet 24, the pole piece 21, and the magnetic fluid 11 to form a magnetic circuit. The method for manufacturing the member C4 is as follows: pole piece 2 in the above embodiment.
The other things are the same except that 5 is not glued. The effects are also the same as those of the above embodiments.
以上説明したように、この発明によれば、ポールピース
の外周部にゴム環体を形成してから、同ポールピースに
環状の磁石を接着するようにしたので、ポールピースと
磁石の接着に使用した接着剤がゴム環体形成時の高熱に
よって劣化しない。As explained above, according to the present invention, a rubber ring is formed on the outer periphery of a pole piece, and then a ring-shaped magnet is bonded to the pole piece. The adhesive will not deteriorate due to the high heat during the formation of the rubber ring.
このため、ポールピースと磁石との間に上記接着剤の劣
化による隙間が発生するのを防止でき、したがって、上
記隙間に磁性流体が浸透することによるシール性とシー
ル寿命の低下を防止できる。Therefore, it is possible to prevent a gap from being generated between the pole piece and the magnet due to deterioration of the adhesive, and therefore, it is possible to prevent a decrease in sealing performance and seal life due to the magnetic fluid penetrating the gap.
第１図（ａ）〜（ｄ）はこの発明の実施例による磁性流
体シール用シール部材の製造方法を説明するための断面
図、第２図は実施例の製造方法によって得られたシール
部材の使用状態を示す断面図、第３図と第４図は実施例
と同じ製造方法で得られるシール部材の他の態様を示す
断面図、第５図は他の実施例によるシール部材の製造方
法によって得られたシール部材とその使用状態を示す断
面図、第６図は従来の磁気ディスク装置の断面図、第７
図は同装置の軸受に使用されている磁性流体シール用シ
ール部材の断面図、第８図（ａ）〜（Ｃ）は第７図のシ
ール部材の製造方法を説明すめための断面図である。
２１−−−−−−環状のポールピース
２３−−−−−ゴム環体
２４−−−−−−環状の磁石
２５−−−−−−環状のポールピース
２６−−−−一接着剤
Ｃ，−−−−−シール部材1(a) to (d) are cross-sectional views for explaining a method of manufacturing a sealing member for a magnetic fluid seal according to an embodiment of the present invention, and FIG. 3 and 4 are cross-sectional views showing other aspects of the seal member obtained by the same manufacturing method as in the example, and FIG. 5 is a cross-sectional view showing the seal member according to another example manufacturing method. FIG. 6 is a sectional view of a conventional magnetic disk device; FIG.
The figure is a sectional view of a magnetic fluid sealing member used in the bearing of the device, and FIGS. 8(a) to (C) are sectional views for explaining the manufacturing method of the sealing member of FIG. 7. . 21------Annular pole piece 23------Rubber ring 24------Annular magnet 25------Annular pole piece 26---One adhesive C ,---Seal member
Claims (2)
ム環体を一体形成してから、前記ポールピースに環状の
磁石を接着剤で接着することを特徴とする磁性流体シー
ル用シール部材の製造方法。(1) A magnetic fluid seal characterized in that a rubber ring is integrally formed by vulcanizing rubber on the outer periphery of an annular pole piece, and then an annular magnet is bonded to the pole piece with an adhesive. Method of manufacturing parts.
環状のポールピースを前記環状の磁石に接着することを
特徴とする特許請求の範囲第１項に記載の磁性流体シー
ル用シール部材の製造方法。(2) A sealing member for a magnetic fluid seal according to claim 1, characterized in that when an annular magnet is adhered to a pole piece, another annular pole piece is adhered to the annular magnet. manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62309464A JPH01153873A (en) | 1987-12-09 | 1987-12-09 | Manufacture of sealing member for sealing magnetic fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62309464A JPH01153873A (en) | 1987-12-09 | 1987-12-09 | Manufacture of sealing member for sealing magnetic fluid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01153873A true JPH01153873A (en) | 1989-06-16 |
Family
ID=17993306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62309464A Pending JPH01153873A (en) | 1987-12-09 | 1987-12-09 | Manufacture of sealing member for sealing magnetic fluid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01153873A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017044315A (en) * | 2015-08-28 | 2017-03-02 | グローブライド株式会社 | Bearing with magnetic fluid seal |
-
1987
- 1987-12-09 JP JP62309464A patent/JPH01153873A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017044315A (en) * | 2015-08-28 | 2017-03-02 | グローブライド株式会社 | Bearing with magnetic fluid seal |
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