JPH01124965U - - Google Patents
Info
- Publication number
- JPH01124965U JPH01124965U JP2025588U JP2025588U JPH01124965U JP H01124965 U JPH01124965 U JP H01124965U JP 2025588 U JP2025588 U JP 2025588U JP 2025588 U JP2025588 U JP 2025588U JP H01124965 U JPH01124965 U JP H01124965U
- Authority
- JP
- Japan
- Prior art keywords
- magnetic fluid
- housing
- magnetic
- fluid seals
- shaft
- 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 claims description 21
- 230000005291 magnetic effect Effects 0.000 claims description 6
- 230000004907 flux Effects 0.000 claims 1
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Rotational Drive Of Disk (AREA)
Description
第１図は本考案の各実施例に共通の磁気デイス
ク装置搭載のスピンドルモータの構成を示す断面
図、第２図は第１実施例による磁性流体シールの
構成を示す断面図、第３図は第２実施例による磁
性流体シールの構成を示す断面図、第４図は第３
実施例による磁性流体シールの構成を示す断面図
、第５図イ，ロは各々従来の磁性流体シールの構
成を示す断面図及び平面図、第６図は第５図に示
した磁性流体シールの分解斜視図、第７図イ，ロ
は各々従来の磁性流体シールのポールピースの偏
心状態を示す断面図である。
１０……スピンドルモータ、１１……シヤフト
、１２……ハウジング、１２Ａ……上部ハウジン
グ（第１ハウジング）、１２Ｂ……下部ハウジン
グ（第２ハウジング）、１５……上部軸受（軸受
）、１６……下部軸受（軸受）、１７……スピン
ドルハブ、１９Ａ〜１９Ｄ……磁気デイスク、２
５……磁性流体シール（第１磁性流体シール）、
２６……磁性流体シール（第２磁性流体シール）
、２７……リングマグネツト、２８，２９……強
磁性体リング、３０……ポールピース、３１……
磁性流体、３２……リングマグネツト、３３，３
４……強磁性体リング、３５……ポールピース、
４０……磁性流体シール（第１磁性流体シール）
、４１，４２……クラツド鋼板リング、４３……
ポールピース、５０……磁性流体シール（第１磁
性流体シール）、５１，５２……テフロン／磁性
体リング、５３……ポールピース。
FIG. 1 is a cross-sectional view showing the configuration of a spindle motor equipped with a magnetic disk device common to each embodiment of the present invention, FIG. 2 is a cross-sectional view showing the configuration of a magnetic fluid seal according to the first embodiment, and FIG. A sectional view showing the structure of the magnetic fluid seal according to the second embodiment, FIG.
A sectional view showing the structure of a magnetic fluid seal according to an embodiment, FIGS. 5A and 5B are a sectional view and a plan view showing the structure of a conventional magnetic fluid seal, respectively, and FIG. The exploded perspective view and FIGS. 7A and 7B are cross-sectional views showing the eccentric state of the pole piece of a conventional magnetic fluid seal. 10... Spindle motor, 11... Shaft, 12... Housing, 12A... Upper housing (first housing), 12B... Lower housing (second housing), 15... Upper bearing (bearing), 16... Lower bearing (bearing), 17...Spindle hub, 19A to 19D...Magnetic disk, 2
5...Magnetic fluid seal (first magnetic fluid seal),
26...Magnetic fluid seal (second magnetic fluid seal)
, 27...Ring magnet, 28, 29...Ferromagnetic ring, 30...Pole piece, 31...
Magnetic fluid, 32...Ring magnet, 33,3
4...Ferromagnetic ring, 35...Pole piece,
40...Magnetic fluid seal (first magnetic fluid seal)
, 41, 42... Clad steel plate ring, 43...
Pole piece, 50...Magnetic fluid seal (first magnetic fluid seal), 51, 52...Teflon/magnetic ring, 53...Pole piece.
Claims (1)
ウジングと、該ハウジング内部に垂設され前記第
１ハウジングに軸方向一端部を固定され且つ前記
第２ハウジングに軸方向他端部を固定されたシヤ
フトと、外周部に磁気デイスクが実装されるスピ
ンドルハブと、前記シヤフト両端部にそれぞれ磁
性流体を介して嵌入固定された第１及び第２の磁
性流体シールと、該第１及び第２の磁性流体シー
ルの間に位置され前記スピンドルハブを前記シヤ
フトに回転支持させる軸受とを具備してなり、 前記第１及び第２磁性流体シールは、前記第１
及び第２磁性流体シールから発生する磁束を前記
第１及び第２磁性流体シールの前記シヤフト外周
部と対向する内周部へ集中させる構造であること
を特徴とする磁気デイスク装置。[Claims for Utility Model Registration] A housing consisting of a first housing and a second housing, which is vertically disposed inside the housing, has one axial end fixed to the first housing, and has the other axial end fixed to the second housing. a spindle hub on which a magnetic disk is mounted on the outer periphery; first and second magnetic fluid seals fitted and fixed to both ends of the shaft via magnetic fluid, respectively; and a bearing positioned between the first and second magnetic fluid seals and rotatably supporting the spindle hub on the shaft, the first and second magnetic fluid seals being arranged between the first and second magnetic fluid seals.
and a magnetic disk device characterized in that the magnetic flux generated from the second magnetic fluid seal is concentrated on the inner circumferential portions of the first and second magnetic fluid seals that are opposed to the outer circumferential portions of the shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2025588U JPH01124965U (en) | 1988-02-18 | 1988-02-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2025588U JPH01124965U (en) | 1988-02-18 | 1988-02-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01124965U true JPH01124965U (en) | 1989-08-25 |
Family
ID=31236465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2025588U Pending JPH01124965U (en) | 1988-02-18 | 1988-02-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01124965U (en) |
-
1988
- 1988-02-18 JP JP2025588U patent/JPH01124965U/ja active Pending