JPH0522088B2 - - Google Patents
Info
- Publication number
- JPH0522088B2 JPH0522088B2 JP59255429A JP25542984A JPH0522088B2 JP H0522088 B2 JPH0522088 B2 JP H0522088B2 JP 59255429 A JP59255429 A JP 59255429A JP 25542984 A JP25542984 A JP 25542984A JP H0522088 B2 JPH0522088 B2 JP H0522088B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic fluid
- shaft
- hub
- housing
- magnetic
- 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.)
- Expired - Lifetime
Links
- 239000011553 magnetic fluid Substances 0.000 claims description 32
- 230000001154 acute effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 2
- 230000036316 preload Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
-
- 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
-
- 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
- F16C2370/00—Apparatus relating to physics, e.g. instruments
- F16C2370/12—Hard disk drives or the like
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Of Bearings (AREA)
- Rotational Drive Of Disk (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はデイスク装置に用いられる磁性流体シ
ールを備えた軸受けユニツト（以下、「スピンド
ル」と称するに関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a bearing unit (hereinafter referred to as a "spindle") equipped with a magnetic fluid seal used in a disk device.
（従来の技術）
従来、この種のスピンドルは第４図に示すよう
にハブ２にシヤフト１を圧入し、ハウジング３に
ボールベアリング４を介してシヤフト１を取り付
け、シヤフト１に取り付けたストツパー６側のボ
ールベアリング４をプリロードスプリング５でプ
リロードを加えてストツパー６に当接させて固定
している。(Prior Art) Conventionally, in this type of spindle, as shown in FIG. 4, a shaft 1 is press-fitted into a hub 2, the shaft 1 is attached to a housing 3 via a ball bearing 4, and a stopper 6 attached to the shaft 1 is attached to the side of the stopper 6 attached to the shaft 1. A ball bearing 4 is preloaded with a preload spring 5 and is fixed in contact with a stopper 6.
このスピンドルが磁気デイスク装置に使用され
る場合は、ボールベアリング４から発生するグリ
ース及びグリース蒸気、更に磁気デイスク装置の
ケースの外の空気が磁気デイスク装置内に入り込
まないよう、第４図のＡ部を第５図に拡大して示
すように磁性流体シールをおこなつている。 When this spindle is used in a magnetic disk device, the area A in FIG. As shown in the enlarged view of FIG. 5, a magnetic fluid seal is provided.
第５図について説明すると、環状のマグネツト
８とマグネツト８を挟んだ一対のヨーク７がハウ
ジング３に設けられ、磁気回路を構成できる鋼ま
たはステンレス鋼の材料によつて作られたシヤフ
ト１とマグネツト８とヨーク７によつて磁気回路
が構成されている。この結果シヤフト１とヨーク
７の微小すきまの間に磁性流体９を入れることに
よつて、シヤフト１が回転しても磁性流体９は飛
散することなく、シヤフト１とヨーク９の間に保
持される。このようにしてシヤフト１とヨーク７
の間はシヤフト１の回転運動にもかかわらず、空
気を遮断することができる。 Explaining FIG. 5, a housing 3 is provided with an annular magnet 8 and a pair of yokes 7 sandwiching the magnet 8, and a shaft 1 and a magnet 8 made of steel or stainless steel material capable of forming a magnetic circuit. A magnetic circuit is constituted by the yoke 7 and the yoke 7. As a result, by putting the magnetic fluid 9 between the minute gap between the shaft 1 and the yoke 7, the magnetic fluid 9 is retained between the shaft 1 and the yoke 9 without scattering even when the shaft 1 rotates. . In this way, shaft 1 and yoke 7
During this period, air can be shut off despite the rotational movement of the shaft 1.
（発明が解決しようとする問題点）
上述の従来のスピンドルでは、磁性流体９は飛
散することがないと考えられているが、磁性流体
の充填量が多かつたり充填位置が適切でなかつた
りすると、シヤフト１とハブ２の回転遠心力で微
小の磁性流体がシヤフト１、ハブ２の第４図にお
ける下側の面（細かい斜線で示す）のＣ部を伝わ
つてスピンドルの外へ飛散するという欠点があつ
た。特にこのスピンドルを磁気デイスク装置に使
用した場合、磁性流体の飛散によつて磁気デイス
クと磁気ヘツドがクラツシユするという大きな事
故に発展することがあつた。(Problems to be Solved by the Invention) In the conventional spindle described above, it is thought that the magnetic fluid 9 does not scatter, but if the amount of magnetic fluid filled is large or the filling position is not appropriate, , The disadvantage is that minute magnetic fluid is transmitted through the C part of the lower surface (shown with fine hatching) of the shaft 1 and the hub 2 in FIG. It was hot. In particular, when this spindle was used in a magnetic disk device, the magnetic disk and magnetic head could collide due to the scattering of the magnetic fluid, which could lead to a serious accident.
本発明はシヤフトに固着されたハブに磁性流体
溜めを設けることにより、上記欠点を解決し、磁
性流体がスピンドルの外へ出ることを防止したス
ピンドルを提供することにある。 The present invention solves the above-mentioned drawbacks by providing a magnetic fluid reservoir in a hub fixed to the shaft, and provides a spindle in which the magnetic fluid is prevented from coming out of the spindle.
（問題点を解決するための手段）
本発明の磁性流体シールを備えた軸受けは、ボ
スを有するハウジングと、
このハウジングに回転自在に取りつけられたシ
ヤフトと、
このシヤフトに固着され、前記ハウジングのボ
スを非接触で覆い、その内面が円筒状に形成され
たハブと、
前記ハウジングのハブに覆われた部分に付設さ
れた磁気回路とを備え、この磁気回路と前記シヤ
フトの間に磁性流体を保持させた軸受けユニツト
において、
前記ハブの円筒状の内面に鋭角に開口した磁性
流体溜めを設けたことを特徴とする。(Means for Solving the Problems) A bearing equipped with a magnetic fluid seal of the present invention includes a housing having a boss, a shaft rotatably attached to the housing, and a shaft fixed to the shaft and having a boss of the housing. a hub whose inner surface is formed into a cylindrical shape, and a magnetic circuit attached to a portion of the housing covered by the hub, and a magnetic fluid is held between the magnetic circuit and the shaft. The bearing unit is characterized in that a magnetic fluid reservoir having an acute angle opening is provided on the cylindrical inner surface of the hub.
（実施例）
次に本発明の実施例について図面を参照して説
明する。(Example) Next, an example of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例の右半分を断面とし
た正面図で、Ｂ部を除けば第１図と同じ構成であ
る。Ｂ部の詳細図である第２図に示すように、ハ
ブ２の内側の面（シヤフト１の中心方向に向う
面）に、シヤフト中心方向に鋭角に開口した磁性
流体溜め１１を設けている。第２図では、この磁
性流体溜め１１は、フランジ１０とハブとを一体
成形することにより形成されており、ハブ２の内
側にシヤフトの中心軸を中心として環状に形成さ
れている。またフランジ１０がハブ２の内側の面
より出ているとイモノの鋳造上問題がある場合に
は、第３図に示すような角度θの磁性流体溜１
１′の溝を切削加工してもよい。 FIG. 1 is a front view of an embodiment of the present invention, with the right half taken in section, and the structure is the same as that of FIG. 1 except for section B. As shown in FIG. 2, which is a detailed view of part B, a magnetic fluid reservoir 11 is provided on the inner surface of the hub 2 (the surface facing toward the center of the shaft 1) and is opened at an acute angle toward the center of the shaft. In FIG. 2, the magnetic fluid reservoir 11 is formed by integrally molding the flange 10 and the hub, and is formed in an annular shape inside the hub 2 around the central axis of the shaft. If the flange 10 protruding from the inner surface of the hub 2 causes problems in casting, the magnetic fluid reservoir 1 at an angle θ as shown in FIG.
The groove 1' may be cut.
角度θは、ハブ２の回転遠心力に対し磁性流体
が伝わらないようにすればよいことから５＜θ≦
90°の範囲が適当であるが、30°≦θ≦60°が有効で
ある。 The angle θ should be 5<θ≦ since it is sufficient to prevent the magnetic fluid from being transmitted to the rotational centrifugal force of the hub 2.
A range of 90° is appropriate, but 30°≦θ≦60° is effective.
更にこれらのフランジ、溝の位置は第４図に示
すＣ部であればどの位置でも有効であることは明
白である。なお、以下の説明では、スピンドルの
シヤフトを垂直に設置した場合を前提として説明
している。しかし、磁性流体溜にたまる磁性流体
はきわめて小量であるためスピンドルのシヤフト
を水平に設置しても、磁性流体が磁性流体溜から
もれ出してスピンドル回転時に飛散することはな
いので、本発明は、スピンドルのシヤフトを水平
に設置した場合にも用いることができる。 Furthermore, it is clear that the positions of these flanges and grooves can be any position as long as they are in section C shown in FIG. Note that the following description is based on the assumption that the shaft of the spindle is installed vertically. However, since the amount of magnetic fluid that accumulates in the magnetic fluid reservoir is extremely small, even if the shaft of the spindle is installed horizontally, the magnetic fluid will not leak from the magnetic fluid reservoir and scatter when the spindle rotates. can also be used when the spindle shaft is installed horizontally.
（発明の効果）
本発明は以上説明したように、スピンドルのハ
ブに磁性流体溜めを設けることによつて、磁性流
体がスピンドルの外へ飛散することを防ぐことが
できる効果である。(Effects of the Invention) As described above, the present invention has the effect of being able to prevent the magnetic fluid from scattering outside the spindle by providing the magnetic fluid reservoir in the hub of the spindle.
第１図は本発明の一実施例の判断面正面図、第
２図は第１図に示すＢ部の拡大断面図、第３図は
本発明の他の実施例のＢ部に相当する部分の拡大
断面図、第４図は従来のスピンドルの半断面正面
図、第５図は第４図に示すＡ部の拡大断面図であ
る。
１……シヤフト、２……ハブ、３……ハウジン
グ、４……ボールベアリング、５…プリロードス
プリング、６……ストツパー、７……ヨーク、８
……マグネツト、９…磁性流体、１０……フラン
ジ、１１，１１′……磁性流体溜。
FIG. 1 is a front view of the judgment surface of one embodiment of the present invention, FIG. 2 is an enlarged sectional view of section B shown in FIG. 1, and FIG. 3 is a section corresponding to section B of another embodiment of the present invention. 4 is a half-sectional front view of a conventional spindle, and FIG. 5 is an enlarged sectional view of section A shown in FIG. 4. 1...Shaft, 2...Hub, 3...Housing, 4...Ball bearing, 5...Preload spring, 6...Stopper, 7...Yoke, 8
...Magnet, 9...Magnetic fluid, 10...Flange, 11, 11'...Magnetic fluid reservoir.
Claims (1)
ヤフトと、 このシヤフトに固着され、前記ハウジングのボ
スを非接触で覆い、その内面が円筒状に形成され
たハブと、 前記ハウジングのハブに覆われた部分に付設さ
れた磁気回路とを備え、この磁気回路と前記シヤ
フトの間に磁性流体を保持させた軸受けユニツト
において、 前記ハブの円筒状の内面に鋭角に開口した磁性
流体溜めを設けたことを特徴とする磁性流体シー
ルを備えた軸受けユニツト。 ２ 磁性流体溜めがフランジによつて形成される
特許請求の範囲第１項記載の磁性流体シールを備
えた軸受けユニツト。 ３ 磁性流体溜めが溝によつて形成される特許請
求の範囲第１項記載の磁性流体シールを備えた軸
受けユニツト。[Scope of Claims] 1. A housing having a boss, a shaft rotatably attached to the housing, and a shaft fixed to the shaft, covering the boss of the housing without contacting the housing, and having an inner surface formed in a cylindrical shape. A bearing unit comprising a hub and a magnetic circuit attached to a portion of the housing covered by the hub, the bearing unit having a magnetic fluid held between the magnetic circuit and the shaft, the cylindrical inner surface of the hub having an acute angle. A bearing unit equipped with a magnetic fluid seal, characterized in that a magnetic fluid reservoir is provided with an opening. 2. A bearing unit equipped with a magnetic fluid seal according to claim 1, wherein the magnetic fluid reservoir is formed by a flange. 3. A bearing unit equipped with a magnetic fluid seal according to claim 1, wherein the magnetic fluid reservoir is formed by a groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59255429A JPS61136020A (en) | 1984-12-03 | 1984-12-03 | Spindle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59255429A JPS61136020A (en) | 1984-12-03 | 1984-12-03 | Spindle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61136020A JPS61136020A (en) | 1986-06-23 |
| JPH0522088B2 true JPH0522088B2 (en) | 1993-03-26 |
Family
ID=17278642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59255429A Granted JPS61136020A (en) | 1984-12-03 | 1984-12-03 | Spindle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61136020A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0414513U (en) * | 1990-05-28 | 1992-02-05 | ||
| US5367416A (en) * | 1992-12-31 | 1994-11-22 | International Business Machines Corporation | Spindle grounding device using magnetic fluid |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5972361U (en) * | 1982-11-05 | 1984-05-16 | 日本精工株式会社 | Bearing unit using magnetic fluid seal |
-
1984
- 1984-12-03 JP JP59255429A patent/JPS61136020A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61136020A (en) | 1986-06-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3059381U (en) | Magnetic fluid sealing device | |
| JPH0522088B2 (en) | ||
| JP2548059Y2 (en) | Rotation detection device | |
| JPH0713408Y2 (en) | Spindle motor | |
| JPH034866Y2 (en) | ||
| JPS5942535Y2 (en) | magnetic clutch | |
| US5633769A (en) | Magnetic disc drive device | |
| JPH0316770Y2 (en) | ||
| JP2002159655A (en) | Windmill device | |
| JPH05276715A (en) | Method of assembling revolving-field type rotor | |
| JP2880563B2 (en) | Spindle motor | |
| JPH0639171Y2 (en) | Sealing device | |
| JPH0142059B2 (en) | ||
| JP2819342B2 (en) | Spindle motor | |
| JPH088768B2 (en) | Spindle motor | |
| JP2963172B2 (en) | Spindle motor | |
| JP2901254B2 (en) | Rotary magnetic head positioning device for magnetic disk drive | |
| JPH0719857Y2 (en) | Vehicle air conditioner damper device | |
| JP2931074B2 (en) | Spindle motor | |
| JP2535736Y2 (en) | Magnetic fluid sealing device | |
| JPH0753399Y2 (en) | Spindle motor | |
| JP3124650B2 (en) | Spindle motor | |
| JP2549541Y2 (en) | Rotation detection device | |
| JP2789492B2 (en) | Motor shaft support structure | |
| JPS631086Y2 (en) |