JPH0513348B2 - - Google Patents
Info
- Publication number
- JPH0513348B2 JPH0513348B2 JP58210756A JP21075683A JPH0513348B2 JP H0513348 B2 JPH0513348 B2 JP H0513348B2 JP 58210756 A JP58210756 A JP 58210756A JP 21075683 A JP21075683 A JP 21075683A JP H0513348 B2 JPH0513348 B2 JP H0513348B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- magnetic seal
- magnetic
- housing
- differential pressure
- 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
- 238000009423 ventilation Methods 0.000 claims description 15
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011553 magnetic fluid Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B25/00—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
- G11B25/04—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card
- G11B25/043—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card using rotating discs
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rotational Drive Of Disk (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
この発明は電子計算機の外部記憶装置として用
いられる磁気デイスク装置用スピンドル構造体の
改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement of a spindle structure for a magnetic disk device used as an external storage device of an electronic computer.
従来この種の装置として第１図に示すものがあ
つた。図において、１はベース、２はこのベース
１をおおつて、密閉容器を構成するエンクロージ
ヤ、３はスピンドル構造体を組立てるハウジン
グ、４はこのハウジング３の貫通するメインシヤ
フト、５はハウジング３の内部でメインシヤフト
４を回転支承する上部ベアリング、６は同じく下
部ベアリングである。７はメインシヤフト４に嵌
合したハブであり、このハブ７に磁気円板８ａと
８ｂがスペーサ９を介して積み重ねられている。
１０はハウジング３に取りつけられ、メインシヤ
フト４との間を気密に保つ磁気シールである。１
１はハウジング３とハブ７との間に形成され密閉
容器内と外気とを連通する通気路であり、磁気シ
ール１０の上下は通気路１１ｄと１１ｅに面して
いる。
A conventional device of this type is shown in FIG. In the figure, 1 is a base, 2 is an enclosure that covers the base 1 and forms a closed container, 3 is a housing for assembling the spindle structure, 4 is a main shaft that passes through the housing 3, and 5 is the inside of the housing 3. 6 is an upper bearing that rotatably supports the main shaft 4, and 6 is a lower bearing. 7 is a hub fitted to the main shaft 4, and magnetic discs 8a and 8b are stacked on this hub 7 with a spacer 9 in between.
A magnetic seal 10 is attached to the housing 3 and maintains airtightness between the housing 3 and the main shaft 4. 1
Reference numeral 1 denotes a ventilation passage formed between the housing 3 and the hub 7 to communicate the inside of the closed container with the outside air, and the upper and lower sides of the magnetic seal 10 face the ventilation passages 11d and 11e.
次に磁気シール１０にかかる差圧について第２
図を用いて説明する。 Next, regarding the differential pressure applied to the magnetic seal 10, the second
This will be explained using figures.
磁気シール１０は、永久磁石１３の磁路１５を
メインシヤフト４の方向に曲げる継鉄１２ａ，１
２ｂ及び各各の継鉄１２ａ，１２ｂとメインシヤ
フト４の間に入つた磁性流体１４ａ，１４ｂから
なり、通気路１１ｄと通気路１１ｅに面してい
る。通気路１１ｄの気圧をエンクロージヤ内圧力
P1、通気路１１ｅの気圧をエンクロージヤ外圧
力P0とすれば、差圧ΔP1＝P1−P0の磁気シール１
０に加わる差圧と呼ぶことにする。差圧ΔP1が限
界値PMAXをこえる、すなわちΔP1＞PMAXになる
と、磁気シールが破れその機能を発揮しなくな
る。 The magnetic seal 10 includes yokes 12a, 1 that bend the magnetic path 15 of the permanent magnet 13 in the direction of the main shaft 4.
2b and magnetic fluids 14a, 14b inserted between each yoke 12a, 12b and the main shaft 4, facing the ventilation path 11d and the ventilation path 11e. The air pressure in the air passage 11d is the enclosure internal pressure.
P 1 , and if the air pressure in the ventilation path 11e is the enclosure external pressure P 0 , then the magnetic seal 1 has a differential pressure ΔP 1 = P 1 −P 0
We will call it the differential pressure applied to 0. When the differential pressure ΔP 1 exceeds the limit value P MAX , that is, when ΔP 1 >P MAX , the magnetic seal breaks and ceases to perform its function.
従来のスピンドル構造体は以上のように構成さ
れているので、エンクロージヤ内圧力P1と、エ
ンクロージヤ外圧力P0とが磁気シールを介して
直接触れるので、差圧ΔP（＝P1−P0）が限界値
PMAXをこえないような条件下でしか使用に耐え
ないという欠点があつた。 Since the conventional spindle structure is configured as described above, the enclosure internal pressure P 1 and the enclosure external pressure P 0 come into direct contact via the magnetic seal, so the differential pressure ΔP (= P 1 − P 0 ) is the limit value
The drawback was that it could only be used under conditions that did not exceed P MAX .
この発明は上記のような従来のものの欠点を除
去するためになされたもので、ハウジングとハブ
間にラビリンス構造をつくり、ここに圧力差をも
たせることによつてエンクロージヤ内圧力とエン
クロージヤ外圧力との差圧を拡大せしめたスピン
ドル構造体を提供することを目的としている。
This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by creating a labyrinth structure between the housing and the hub and creating a pressure difference there, the pressure inside the enclosure and the pressure outside the enclosure can be adjusted. The object of the present invention is to provide a spindle structure that increases the differential pressure between the two.
以下、この発明の一実施例を図について説明す
る。第３図において、３はハウジング、７はハ
ブ、１０は磁気シール、１１は通気路である。１
６ａはこのハウジング３側に通気路１１ａ〜１１
ｂ間に設けられたラビリンスであり、１６ｂは同
じくハブ７側に対応して設けられたラビリンスで
ある。以下１６ａと１６ｂとを合わせてラビリン
ス構造１６と呼ぶことにする。
An embodiment of the present invention will be described below with reference to the drawings. In FIG. 3, 3 is a housing, 7 is a hub, 10 is a magnetic seal, and 11 is a ventilation path. 1
6a is a ventilation passage 11a to 11 on this housing 3 side.
A labyrinth 16b is provided between the hub 7 and the labyrinth 16b. Hereinafter, 16a and 16b will be collectively referred to as labyrinth structure 16.
次に、ラビリンス構造１６と磁気シール１０の
圧力関係について第４図を用いて説明する。エン
クロージヤ内圧力P2は通気路１１ａの位置で示
されるとすれば、エンクロージヤ外圧力Ｐ 0との
関係は、
P2＝△P2＋△P1＋Ｐ 0
ここで△P2はラビリンス構造１６の通気路１
１ａと１１ｂ間の差圧である。 Next, the pressure relationship between the labyrinth structure 16 and the magnetic seal 10 will be explained using FIG. 4. Assuming that the enclosure internal pressure P 2 is indicated by the position of the ventilation passage 11a, the relationship with the enclosure external pressure P 0 is P 2 = △P 2 + △P 1 + P 0 where △P 2 is the labyrinth Ventilation channel 1 of structure 16
This is the differential pressure between 1a and 11b.
スピンドル構造体の圧力負担を△Ｐとすれば、 △Ｐ＝P2−P0＝△P2＋△P1 となる。 If the pressure burden on the spindle structure is ΔP, then ΔP=P 2 −P 0 =ΔP 2 +ΔP 1 .
さて、一般にラビリンス構造１６の差圧は△
P2＞０であるから、△Ｐ＝△P2−＋△P1＞△P1
＞PMAXとなり、スピンドル構造体の圧力負担△
Ｐは磁気シール１０のみに比べて△P2だけ改善
されていることがわかる。△P2の大きさとラビ
リンス構造との関係を第５図を用いて説明する。
△P2の大きさはラビリンス構造１６の１６ａと
１６ｂのすき間１７の大きさ及びラビリンス構造
の長さ１８及びフインの数１９に関係する。△
P2を大きくするには、すき間の大きさを小さく
し、ラビリンス構造の長さを長くし、フインの数
を多くすればよい。 Now, generally speaking, the differential pressure in the labyrinth structure 16 is △
Since P 2 > 0, △P=△P 2 −+△P 1 > △P 1
＞P MAX , and the pressure burden on the spindle structure △
It can be seen that P is improved by ΔP 2 compared to the magnetic seal 10 alone. The relationship between the size of ΔP 2 and the labyrinth structure will be explained using FIG.
The size of ΔP 2 is related to the size of the gap 17 between 16a and 16b of the labyrinth structure 16, the length 18 of the labyrinth structure, and the number 19 of fins. △
In order to increase P 2 , the size of the gap should be reduced, the length of the labyrinth structure should be increased, and the number of fins should be increased.
また、スピンドル構造体の圧力負担△Ｐすなわ
ちエンクロージヤ内圧力とエンクロージヤ外圧力
の差はラビリンス構造１６の差圧△P2と磁気シ
ール１０の差圧△P1の２部分に分配する通気路
を構成しているから、磁気シール１０に印加され
る差圧△P1はスピンドル構造体の圧力負担△Ｐ
からラビリンス構造１６の差圧△P2を減じたも
のとみることもでき、より高い圧力負担△Ｐに至
るまで磁気シール１０には磁気シールの破れの限
界値PMAXを下まわる圧力しかかからず破れるこ
とがない。 In addition, the pressure burden ΔP of the spindle structure, that is, the difference between the enclosure internal pressure and the enclosure external pressure, is divided into two parts: the differential pressure ΔP 2 of the labyrinth structure 16 and the differential pressure ΔP 1 of the magnetic seal 10. Therefore, the differential pressure △P 1 applied to the magnetic seal 10 is equal to the pressure burden △P on the spindle structure.
It can be considered that the differential pressure △P 2 of the labyrinth structure 16 is subtracted from △P2, and until a higher pressure load △P is reached, the magnetic seal 10 is only subjected to a pressure below the limit value P MAX for breaking the magnetic seal. It will never tear.
なお、上記実施例ではラビリンス構造１６を通
気路１１ａと通気路１１ｂの中間に設けたものを
示したが、より磁気シール１０に近い通気路１１
ｃと通気路１１ｄの中間に設けても良い。また、
磁気シール１０と上部ベアリング５の間の通気路
１１ｅの位置に設けることもできる。 In the above embodiment, the labyrinth structure 16 is provided between the ventilation passage 11a and the ventilation passage 11b, but the ventilation passage 11 closer to the magnetic seal 10 is
It may be provided between the air passage c and the ventilation passage 11d. Also,
It can also be provided at the position of the air passage 11e between the magnetic seal 10 and the upper bearing 5.
以上説明したように、本願のスピンドル構造体
によれば、磁気円板を配置した密閉容器内が磁気
シールとラビリンス構造との差圧によつて二重に
シールされることになる。この結果、磁気シール
に印加される差圧（P1−P0）を磁気シールの限
界値PMAXより十分大きくすることが可能となる
ので、可動部と固定部とをシールする磁気シール
の磁性流体が破れてシール不能による磁気円板の
事故の発生を防止することができる。
As explained above, according to the spindle structure of the present application, the inside of the closed container in which the magnetic disk is arranged is doubly sealed by the differential pressure between the magnetic seal and the labyrinth structure. As a result, the differential pressure (P 1 − P 0 ) applied to the magnetic seal can be made sufficiently larger than the limit value P MAX of the magnetic seal, so the magnetic property of the magnetic seal that seals the movable part and the fixed part can be increased. It is possible to prevent an accident with the magnetic disk due to fluid rupture and sealing failure.
よつて、本発明によれば磁気円板を外気より高
く、しかも安定した圧力に保持された気密容器内
に収容する磁気デイスク装置用のスピンドル構造
体を提供することができる。 Therefore, according to the present invention, it is possible to provide a spindle structure for a magnetic disk device in which a magnetic disk is housed in an airtight container which is maintained at a stable pressure higher than the outside air.
第１図は従来のスピンドル構造体を示す断面
図、第２図は磁気シールの詳細を示す拡大図、第
３図はこの発明の一実施例を示す断面図、第４図
は圧力関係を示す説明図、第５図はラビリンス構
造を示す拡大図である。
３はハウジング、４はメインシヤフト、７はハ
ブ、１０は磁気シール、１１は通気路、１６はラ
ビリンス構造であつて、図中同一部分又は相当部
分には同一符号を付してある。
Fig. 1 is a sectional view showing a conventional spindle structure, Fig. 2 is an enlarged view showing details of a magnetic seal, Fig. 3 is a sectional view showing an embodiment of the present invention, and Fig. 4 shows pressure relationships. The explanatory diagram, FIG. 5, is an enlarged view showing the labyrinth structure. 3 is a housing, 4 is a main shaft, 7 is a hub, 10 is a magnetic seal, 11 is a ventilation path, and 16 is a labyrinth structure, and the same or equivalent parts in the drawings are given the same reference numerals.
Claims (1)
て外気と連通する通気路に設けられた磁気シール
により内部が気密に保持された密閉容器と、前記
ベースに固定されたハウジングに軸受けされ軸端
に固定されたハブを介して取付けられた磁気円板
を前記密閉容器内に配置させたメインシヤフトと
を備えたスピンドル構造体において、 前記ハウジングとハブの〓間で前記通気路の一
部を形成する通気路にラビリンス構造を設け該ラ
ビリンス構造と前記磁気シールで形成する差圧に
より前記密閉容器のシールを二重構造に構成した
ことを特徴とするスピンドル構造体。[Claims] 1. A closed container whose interior is kept airtight by a magnetic seal provided in a ventilation path that is surrounded by an enclosure that covers the surface of the base and communicates with the outside air, and a housing fixed to the base. A spindle structure including a main shaft in which a magnetic disk mounted via a hub supported by a shaft and fixed to an end of the shaft is disposed in the closed container, and the air passage is provided between the housing and the bottom of the hub. 1. A spindle structure characterized in that a labyrinth structure is provided in an air passage forming a part of the air passage, and the seal of the airtight container is configured to have a double structure due to the differential pressure formed between the labyrinth structure and the magnetic seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21075683A JPS60103554A (en) | 1983-11-11 | 1983-11-11 | Spindle structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21075683A JPS60103554A (en) | 1983-11-11 | 1983-11-11 | Spindle structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60103554A JPS60103554A (en) | 1985-06-07 |
| JPH0513348B2 true JPH0513348B2 (en) | 1993-02-22 |
Family
ID=16594604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21075683A Granted JPS60103554A (en) | 1983-11-11 | 1983-11-11 | Spindle structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60103554A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0679267A (en) * | 1992-09-07 | 1994-03-22 | Lintec Corp | Oil-absorbing sheet |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0869494B1 (en) * | 1997-04-01 | 2006-05-17 | Papst Licensing GmbH & Co. KG | Disk storage device with improved spindle torque and acceleration |
| EP1881497B1 (en) * | 1997-04-01 | 2009-08-19 | Papst Licensing GmbH & Co. KG | Disk storage device with improved spindle torque and acceleration |
| AU2635597A (en) * | 1997-04-01 | 1998-10-22 | Papst Licensing Gmbh | Disk storage device with improved spindle torque and acceleration |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS563831U (en) * | 1979-06-20 | 1981-01-14 | ||
| JPS57105863A (en) * | 1980-12-22 | 1982-07-01 | Nec Corp | Magnetic disc device |
| JPS57183682A (en) * | 1981-05-06 | 1982-11-12 | Nec Corp | Magnetic disk device |
| JPS6038762A (en) * | 1983-08-09 | 1985-02-28 | Comput Basic Mach Technol Res Assoc | Magnetic disk device |
-
1983
- 1983-11-11 JP JP21075683A patent/JPS60103554A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS563831U (en) * | 1979-06-20 | 1981-01-14 | ||
| JPS57105863A (en) * | 1980-12-22 | 1982-07-01 | Nec Corp | Magnetic disc device |
| JPS57183682A (en) * | 1981-05-06 | 1982-11-12 | Nec Corp | Magnetic disk device |
| JPS6038762A (en) * | 1983-08-09 | 1985-02-28 | Comput Basic Mach Technol Res Assoc | Magnetic disk device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0679267A (en) * | 1992-09-07 | 1994-03-22 | Lintec Corp | Oil-absorbing sheet |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60103554A (en) | 1985-06-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6525899B2 (en) | Hermetically sealed data storage device with adhesive seal | |
| JPH0513348B2 (en) | ||
| JPS62279587A (en) | Magnetic disk driving device | |
| JPH0743038B2 (en) | Non-contact end face seal | |
| JP2582928Y2 (en) | Gas meter | |
| JPH02275182A (en) | Non-contact type mechanical seal | |
| JPH03260980A (en) | Magnetic disk device | |
| JPS60160073U (en) | brushless motor | |
| JPS61104384A (en) | Disk device | |
| JP3031958B2 (en) | Dustproof seal structure of spindle motor | |
| JP2718672B2 (en) | Sealed magnetic disk drive | |
| JP2001143462A (en) | Disk-recording device | |
| JP2969279B2 (en) | motor | |
| JP2597044Y2 (en) | Seal structure of packing | |
| JPS6162345A (en) | Disk drive motor | |
| JPH02309065A (en) | Rotary bearing device for gas insulation opening/closing device | |
| JPS61151892A (en) | Air filter of magnetic disk device | |
| JP2570181B2 (en) | Magnetic disk drive | |
| JPH0922586A (en) | Magnetic disk device | |
| JPH0278069A (en) | Bearing structure | |
| JP2928461B2 (en) | Magnetic fluid sealing device | |
| JPH0384790A (en) | Magnetic disk device | |
| JPH07111026A (en) | Magnetic fluid sealing structure for motor | |
| JPH056616A (en) | Spindle motor for magnetic disk device | |
| JPH0425621A (en) | Support structure for low heat distortion bearing |