JPS6028092A - Rotary shaft sealing structure of disk drive motor - Google Patents
Rotary shaft sealing structure of disk drive motorInfo
- Publication number
- JPS6028092A JPS6028092A JP13716883A JP13716883A JPS6028092A JP S6028092 A JPS6028092 A JP S6028092A JP 13716883 A JP13716883 A JP 13716883A JP 13716883 A JP13716883 A JP 13716883A JP S6028092 A JPS6028092 A JP S6028092A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- rotary shaft
- ring
- hub
- rotating 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
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/20—Driving; Starting; Stopping; Control thereof
Landscapes
- Rotational Drive Of Disk (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は磁気ディスク装置の回転軸シール構造について
、ハブに配設された軟磁性のリングによって、ポールピ
ース及びマグネットから成る磁性流体シール機構と閉磁
気回路を構成し、リングとポールピースの間の空隙に磁
性流体を注入して回転軸シールを行うディスクドフィプ
モータの回転軸シール構造に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary shaft seal structure for a magnetic disk device, in which a magnetic fluid seal mechanism and a closed magnetic circuit consisting of a pole piece and a magnet are constructed by a soft magnetic ring disposed on a hub. The present invention relates to a rotary shaft sealing structure for a disk-type motor that performs rotary shaft sealing by injecting magnetic fluid into the gap between a ring and a pole piece.
一般にハードディスクドフィプと呼ばれる磁気ディスク
装置に於ては、磁気ディスク記録面への記録再生を浮上
磁気ヘッドにより行っていて、浮上磁気ヘッドの浮上量
が概ね１ミクロン以下である為に浮上磁気ヘッド及び磁
気ディスク部の防塵性が非常に重要であシ、ディスクド
フィプモータ部分よシ発生する塵を防止する為にディス
クドフィブモータの回転軸シールが必要である。従って
防塵性の要求から、回転軸シールに比較的構造が簡単で
比較的トルク損失の少ない磁性流体による回転軸シール
が用いられている。In a magnetic disk device generally called a hard disk drive, a floating magnetic head performs recording and reproduction on the magnetic disk recording surface, and since the flying height of the floating magnetic head is approximately 1 micron or less, the floating magnetic head Dust-proofing of the magnetic disk part is very important, and a rotating shaft seal of the disk-fib motor is required to prevent dust from being generated in the disk-fib motor part. Therefore, due to the requirement for dustproof properties, a rotating shaft seal made of magnetic fluid is used, which has a relatively simple structure and relatively low torque loss.
磁性流体による一般的な回転軸シール構造は、嬉１図に
、示す如く、軟磁性の回転軸ｌ、マグネット２．軟磁性
の上ポールピース３−（α’ ｅ 軟ｍ 性）下ボルル
ピース３−［ｂｌ、磁性流体５．で構成され、第１図中
の矢印方向の磁束によって回転軸とポールピースとの間
の空隙で磁性流体を保持し回転軸のシールを行っている
。ここで特に上下２枚のポールピースでマグネットを挾
持させた部分４を磁性流体シール機構と呼ぶ、第１図の
如き回転軸シール構造の場合、回転軸が軟磁性である為
に回転軸を介してディスクドフィブモータで発生する電
磁ノイズが磁気ヘッドに入り正常な磁気記録再生を限害
する恐れがあシ、また、ディスクドライブモータ組立時
に予め磁性流体シール機構の空隙へ磁性流体を入れると
回転軸を挿入するときに回転軸に磁性流体が付着した状
態となり磁性流体の損失となる。従ってディスクドフィ
ブモータの回転軸シール構造は次に述べるような構造を
とっている。A general rotary shaft seal structure using a magnetic fluid, as shown in Figure 1, consists of a soft magnetic rotary shaft l, a magnet 2. Soft magnetic upper pole piece 3 - (α' e soft m property) lower pole piece 3 - [bl, magnetic fluid 5. The magnetic flux in the direction of the arrow in FIG. 1 holds the magnetic fluid in the gap between the rotating shaft and the pole piece, thereby sealing the rotating shaft. In particular, in the case of a rotary shaft seal structure as shown in Fig. 1, in which the part 4 in which the magnet is held between two upper and lower pole pieces is called a magnetic fluid seal mechanism, the rotary shaft is soft magnetic, so the Electromagnetic noise generated by the disk drive motor may enter the magnetic head and limit normal magnetic recording and playback. Also, if magnetic fluid is inserted into the gap in the magnetic fluid sealing mechanism beforehand when assembling the disk drive motor, the rotating shaft may be damaged. When inserting the rotary shaft, magnetic fluid adheres to the rotating shaft, resulting in loss of magnetic fluid. Therefore, the rotary shaft seal structure of the disk-fib motor has the following structure.
従来のディスクドフィプモ〜りの回転軸シール構造は、
第２図に示す如く、複数の磁気ディスクＩＩ 、該磁気
ディスクを保持するハブ、該ハブが嵌合固定される回転
軸１３．該回転軸の）・プ嵌合部より下（第２図中下）
に位置する部分に嵌合或いは接着固定される軟磁性のリ
ング１４、該リングよりさらに下に位置する回転軸の部
分に固定或いは係合される止め輪１８、軸方向荷重を止
め輪を介して受けるベアリング１９（第２図の場合軸方
向荷重は止め輪を介してベアリング内輪に伝達されベア
リング外輪がハウジング２０に固定される）、ハウジン
グ２０にはベアリング及び磁性流体シール機Ｍ（第２図
中１５及び１６で構成される部分）が嵌合或いは接着固
定され磁性流体シール機構は第１図で述べた如く、上ポ
ールピース１５−１ａｌ、下ポールピース１５− ｆｂ
＋ 、上下ポールピースで挾持されるマグネット１６に
よって構成されており、上下ポールピースとリングとの
空隙に生じる磁束で磁性流体１７を保持し回転軸のシー
ルを行っている。第２図の如き従来の回転軸シール構造
では、次のような欠点を有している。The rotary shaft seal structure of the conventional disc dop model is
As shown in FIG. 2, a plurality of magnetic disks II, a hub for holding the magnetic disks, and a rotating shaft 13 to which the hubs are fitted and fixed. below the fitting part of the rotating shaft (bottom center in Figure 2)
A soft magnetic ring 14 is fitted or adhesively fixed to a portion of the rotating shaft located below the ring, and a retaining ring 18 is fixed or engaged to a portion of the rotating shaft located further below the ring. The housing 20 is equipped with a bearing 19 (in FIG. 2, the axial load is transmitted to the inner ring of the bearing via a retaining ring, and the outer ring of the bearing is fixed to the housing 20), and a magnetic fluid seal machine M (in FIG. 2). 15 and 16) are fitted or fixed with adhesive, and the magnetic fluid sealing mechanism is as described in FIG.
+, It is composed of a magnet 16 held between the upper and lower pole pieces, and the magnetic flux generated in the gap between the upper and lower pole pieces and the ring holds the magnetic fluid 17 and seals the rotating shaft. The conventional rotating shaft seal structure as shown in FIG. 2 has the following drawbacks.
【１）回転軸と非磁性のハブ（アルミ材が多い）との嵌
合力が弱く嵌合面面積を増大させるか回転軸のハブとの
嵌合面にギアを切っておき嵌合力を増加させなければな
らず、ハブの後加工（回転軸へ固定後に振れ取シ加工及
びバランス数カ加工）が困難である。[1] The mating force between the rotating shaft and the non-magnetic hub (mostly made of aluminum) is weak. Increase the mating surface area or cut a gear on the mating surface of the rotating shaft and the hub to increase the mating force. Therefore, post-processing of the hub (run-out processing and balance processing after fixing to the rotating shaft) is difficult.
＋２１軸方向荷重をベアリングに伝達する為に回転軸に
止め輪を固定或いは係合しなければならず、リングと止
め輪を同一部材で構成することは一般にベアリングが軟
磁性の材料を用いている為にベアリングに磁力による悪
影１８（寿命、騒音）を与えてしまう。+21 In order to transmit axial load to the bearing, a retaining ring must be fixed or engaged with the rotating shaft, and the ring and retaining ring are generally made of the same material because the bearing is made of soft magnetic material. Therefore, the magnetic force causes negative effects 18 (lifespan, noise) on the bearing.
１３１止め輪が必要な為に部品点数及び工数が増大しコ
ストアップにつナカル。The need for a 131 retaining ring increases the number of parts and man-hours, leading to increased costs.
（４）磁気ディスク面の高さ精度がノ・プの回転軸への
嵌合精度及び止め輪の取付精度によシ決定され、ハブと
止め輪の２部品での回転軸への取付精度で磁気ディスク
面の高さ精度を出すことは困促ｆである。(4) The height accuracy of the magnetic disk surface is determined by the fitting accuracy of the knob to the rotating shaft and the installation accuracy of the retaining ring, and the accuracy of the attachment of the two parts, the hub and the retaining ring, to the rotating shaft. It is difficult to achieve height accuracy of the magnetic disk surface.
（５）回転軸とノ・プとの嵌合面が多く必要なことと止
め輪を軸に付加しなければならない為、軸方向荷重を受
けるベアリングと回転軸を受ける他のベアリング（メタ
ル軸受でも可）との間のスパン長が短くなシ、回転軸ひ
いては磁気ディスクのラジアル振れ及びアキシャル振れ
が増大し磁気記録再生精度が悪くなってし塘う。(5) Since a large number of mating surfaces are required between the rotating shaft and the knob, and a retaining ring must be added to the shaft, it is necessary to use a bearing that receives axial loads and other bearings that receive the rotating shaft (even metal bearings). If the span length between the magnetic disk and the rotary shaft is short, the radial and axial vibrations of the rotating shaft and thus the magnetic disk will increase, resulting in poor magnetic recording and reproducing accuracy.
１６１止め輪の替りに回転軸を段付に加工したとすれば
工数が増すだけでなく回転軸の精度が悪くなる。If the rotating shaft is machined into a stepped shape instead of the 161 retaining ring, not only will the number of man-hours increase, but the accuracy of the rotating shaft will deteriorate.
本発明は以上の如き従来の欠点を除去したものでその目
的は、ディスクドライブモータの回転軸シール構造の簡
略化に伴う工数の低減と低コスト化、回転軸とハブとの
嵌合面面積の増加による嵌合強度の増大、マグネットに
よる磁気的悪幣の低減、磁気ディスク回転精度の向上、
にある。The present invention eliminates the above-mentioned conventional drawbacks, and its objectives are to reduce man-hours and costs by simplifying the rotary shaft seal structure of a disk drive motor, and to reduce the mating surface area between the rotary shaft and the hub. Increased mating strength due to increase in strength, reduction of magnetic debris due to magnets, improvement of magnetic disk rotation accuracy,
It is in.
以下実施例に基づいて本発明の詳細な説明する。The present invention will be described in detail below based on Examples.
第３図に於て、２１は複数の磁気ディスク、２２は磁気
ディスクを保持する非磁性のハブ、２３はノ１プが嵌合
固定される非磁性の回転軸、冴はノ・プに配設された軟
磁性のリング％謳−（α）は軟磁性の上ポールピース、
２５−（５１は軟磁性の下ポールピース、２６ ｉｔマ
グネット、２７は磁性流体、２８はベアリング、２９は
ハウジングである。第３図の如く本実施例では軟磁性の
リングはハブと回転軸との嵌合円筒部分Ω外周の一部分
に嵌合或いは接着固定されており、リングとポールピー
スの空隙で磁性流体を保持し回転軸シールを行っている
。また、上下２枚のポールピースでマグネットを挾持し
て磁性流体シール機構を構成し、磁性流体シール機構は
ハウジングに嵌合或いは接着によシ固定され、ベアリン
グも同様にノ・つ〉ングに外輪を固定される。In Fig. 3, 21 is a plurality of magnetic disks, 22 is a non-magnetic hub that holds the magnetic disks, 23 is a non-magnetic rotating shaft to which the knob is fitted and fixed, and Sae is arranged on the knob. The soft magnetic ring (α) is the soft magnetic upper pole piece,
25-(51 is a soft magnetic lower pole piece, 26 is an IT magnet, 27 is a magnetic fluid, 28 is a bearing, and 29 is a housing. As shown in Fig. 3, in this embodiment, the soft magnetic ring is connected to the hub and rotating shaft. The fitting cylindrical part Ω is fitted or fixed with adhesive to a part of the outer circumference, and the gap between the ring and pole piece holds the magnetic fluid and seals the rotating shaft.In addition, the two upper and lower pole pieces hold the magnet. The magnetic fluid seal mechanism is clamped to form a magnetic fluid sealing mechanism, and the magnetic fluid sealing mechanism is fixed to the housing by fitting or adhesive, and the outer ring of the bearing is similarly secured to the nozzle.
第３図の如き回転軸シール構造により回転軸とハブとの
嵌合面積は約２倍に増加し、はめあ込が同じであれば嵌
合強度も同様に約２倍となりスペースの有効利用を可能
にしている許シでなく、・・プの回転軸との嵌合同筒部
分の下面で軸方向荷重をベアリングに伝達しており工数
及び部品点数が低減されハブの取付高さ精度も向上して
いる。また、ハブからベアリングに至るまでの軸方向の
長さも従来例より低減可能で軸受間のスパン長も長くな
り回転軸の振れ等の回転精度は向上する。さらに、転軸
基準によるハブの後加工、特に磁気ディスク保持面のラ
ジアル振れ及びアキシャル振れを減する加工、及びダイ
ナミックバランス取９加工、が容易になり、ハブの回転
体としての精度は向上している。なお、磁性流体を保持
する磁気回路は上ポールピース、リング、下ポールピー
ス、マグネットによＱ閉磁気回路を構成しており、ポー
ルピースとリングとの間の空隙で磁性流体を保持してい
る。ハブと回転軸とハウジングは非磁性の材料によ多構
成し、磁気的ノイズを発生しにぐい構造になっている。With the rotary shaft seal structure shown in Figure 3, the mating area between the rotary shaft and the hub is approximately doubled, and if the fit is the same, the mating strength is also approximately doubled, allowing for effective use of space. The axial load is transmitted to the bearing on the bottom surface of the cylinder part that fits with the rotating shaft of the hub, which reduces the number of man-hours and parts and improves the accuracy of the hub installation height. ing. Furthermore, the axial length from the hub to the bearing can be reduced compared to the conventional example, and the span length between the bearings is also increased, improving rotation accuracy such as vibration of the rotating shaft. Furthermore, post-processing of the hub based on the rolling axis standard, especially processing to reduce radial and axial runout of the magnetic disk holding surface, and dynamic balance processing, has become easier, improving the accuracy of the hub as a rotating body. There is. The magnetic circuit that holds the magnetic fluid consists of the upper pole piece, ring, lower pole piece, and magnet to form a Q closed magnetic circuit, and the magnetic fluid is held in the gap between the pole piece and the ring. . The hub, rotating shaft, and housing are made of non-magnetic materials and have a structure that does not easily generate magnetic noise.
本発明と従来例を比較すると、本発明で軟磁性のリング
をハブの一部に配設することができたために、部品点数
の低減が可能になっただけでなく。Comparing the present invention and the conventional example, the present invention not only makes it possible to reduce the number of parts because the soft magnetic ring can be disposed in a part of the hub.
軸受間のスパン長が長くなり回転軸の回転精度が向上し
、ハブの取付精度及び回転精度も向上した。The span length between the bearings has been lengthened, improving the rotational accuracy of the rotating shaft, and the hub mounting accuracy and rotational accuracy have also been improved.
本発明は磁気ディスク装置の磁気ディスク及び磁気ヘッ
ドが所在する部分の防塵密封構造につして、ディスクド
フィブモータの回転軸シール構造に関するもので、本発
明による回転軸シール構造をとることにより、・・プと
回転軸の嵌合強度が大きくなυノ・ブの後加工が容易に
なるだけでなく、構造が省スペース的で部品点数の低減
と組立工数の低減によるコストダウンが可能であり、回
転軸を保持する２個の軸受間のスパン長も長くでき回転
軸及びハブの振れも低減でき、磁気的ノイズも発生及び
伝播し難い、等の優れた効果を有するもので、固定型磁
気ディスク装置のディスクドフィプモータの回転軸シー
ル等、非常に高度な防塵性を必要とするディスクドフィ
ブモータの回転軸シールに好適である。The present invention relates to a dust-proof sealing structure for a portion of a magnetic disk drive where a magnetic disk and a magnetic head are located, and relates to a rotary shaft seal structure for a disk-dove motor.By adopting the rotary shaft seal structure according to the present invention, ...Not only does the post-processing of the υ knob, which has a strong mating strength between the pulley and the rotating shaft, become easier, but the structure is space-saving, and costs can be reduced by reducing the number of parts and assembly man-hours. The fixed magnetic It is suitable for the rotating shaft seal of a disk-fibbed motor that requires extremely high dustproof properties, such as the rotating shaft seal of a disk-fibbed motor of a disk device.
第１図は一般的な回転軸シール構造の断面図であり、１
は回転軸、２はマグネット、３−（α１は上ポールピー
ス、３−１ｂ１は下ポールピース、４は磁性流体シール
機構、５は磁性流体である。
第２図は従来のディスクドフィプモータの回転軸シール
構造の断面概観図である。
第３図は本発明によるディスクドフィプモータの回転軸
シール構造の断面概観図であり、２１は磁気ディスク、
２２は）−プ、おは回転軸、２４はリング、５はポール
ピース、２６はマグネット、２７は磁性流体、郡はベア
リング、２９はハウジングである。
以 上
出願人 株式会社諏訪精工舎
第１図Figure 1 is a cross-sectional view of a general rotary shaft seal structure.
is a rotating shaft, 2 is a magnet, 3-(α1 is an upper pole piece, 3-1b1 is a lower pole piece, 4 is a magnetic fluid sealing mechanism, and 5 is a magnetic fluid. Figure 2 shows a conventional disk-type motor. Fig. 3 is a cross-sectional view of the rotary shaft seal structure of the disk-type motor according to the present invention, in which 21 is a magnetic disk;
22 is a rotary shaft, 24 is a ring, 5 is a pole piece, 26 is a magnet, 27 is a magnetic fluid, 2 is a bearing, and 29 is a housing. Applicant: Suwa Seikosha Co., Ltd. Figure 1
Claims (1)
クを保持する非磁性のハブ、該ハブを嵌合する回転軸、
該回転軸を受けるベアリング、該ベアリングが保持固定
されるハウジングを有するディスクドフィプモータの回
転軸シール構造について、前記ハブの前記回転軸への嵌
春円筒部分外周に軟磁性のリングを配設し、一方、前記
ハウジングには２枚の軟磁性のポールピースでマグネッ
トを挾持せしめる磁性流体シール機構を配設し、前記リ
ングと前記ポールピースとの間の空隙に磁性流体を注入
し、回転軸シールを前記ハブに配設された。前記リング
の外周で行うことを特徴とするディスクドフィプモータ
の回転軸シール構造。A magnetic disk as a magnetic recording and reproducing medium, a non-magnetic hub that holds the magnetic disk, a rotating shaft that fits the hub,
Regarding the rotary shaft seal structure of a disk-type motor having a bearing that receives the rotary shaft and a housing in which the bearing is held and fixed, a soft magnetic ring is arranged on the outer periphery of the cylindrical portion of the hub that is fitted onto the rotary shaft. On the other hand, the housing is provided with a magnetic fluid sealing mechanism in which a magnet is held between two soft magnetic pole pieces, and a magnetic fluid is injected into the gap between the ring and the pole pieces, and the rotating shaft is A seal is disposed on the hub. A rotary shaft seal structure for a disc dop motor, characterized in that sealing is performed on the outer periphery of the ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13716883A JPS6028092A (en) | 1983-07-27 | 1983-07-27 | Rotary shaft sealing structure of disk drive motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13716883A JPS6028092A (en) | 1983-07-27 | 1983-07-27 | Rotary shaft sealing structure of disk drive motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6028092A true JPS6028092A (en) | 1985-02-13 |
Family
ID=15192405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13716883A Pending JPS6028092A (en) | 1983-07-27 | 1983-07-27 | Rotary shaft sealing structure of disk drive motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6028092A (en) |
-
1983
- 1983-07-27 JP JP13716883A patent/JPS6028092A/en active Pending
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