JP2554943Y2 - Spindle motor - Google Patents
Spindle motorInfo
- Publication number
- JP2554943Y2 JP2554943Y2 JP1991110802U JP11080291U JP2554943Y2 JP 2554943 Y2 JP2554943 Y2 JP 2554943Y2 JP 1991110802 U JP1991110802 U JP 1991110802U JP 11080291 U JP11080291 U JP 11080291U JP 2554943 Y2 JP2554943 Y2 JP 2554943Y2
- Authority
- JP
- Japan
- Prior art keywords
- annular
- spindle motor
- hub member
- hub
- annular member
- 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 - Fee Related
Links
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
- F16C33/80—Labyrinth sealings
-
- 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
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
- F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
-
- 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
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/54—Systems consisting of a plurality of bearings with rolling friction
-
- 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
- F16C2380/00—Electrical apparatus
- F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Motor Or Generator Frames (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は、例えば、光・磁気ディ
スク駆動装置に搭載され、記録ディスクを回転駆動する
ためのスピンドルモータに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a spindle motor mounted on an optical / magnetic disk drive for rotating a recording disk.
【０００２】[0002]
【従来の技術】図３は、例えば記録ディスクとして磁気
ディスクを回転駆動するためのスピンドルモータであ
り、その断面図を示す。図３において、椀形状のハブ部
材ｂには磁気ディスクａが所定枚数装着される。静止部
材であるシャフトｃの両端には、一対の玉軸受ｍ，ｎが
装着され、この玉軸受ｍ，ｎを介して（実際には、ｎの
玉軸受には更にスペース部材ｈが介装される）、ハブ部
材ｂが回転自在に支持される。そして、電機子ｅと界磁
磁石ｆとの電磁作用により、ハブ部材ｂは、シャフトｃ
に対し相対回転駆動される。2. Description of the Related Art FIG. 3 is a sectional view of a spindle motor for rotating a magnetic disk as a recording disk, for example. In FIG. 3, a predetermined number of magnetic disks a are mounted on a bowl-shaped hub member b. A pair of ball bearings m and n are mounted on both ends of the shaft c which is a stationary member, and via the ball bearings m and n (actually, a space member h is further interposed on the n ball bearings). And the hub member b is rotatably supported. Then, by the electromagnetic action of the armature e and the field magnet f, the hub member b
Are driven to rotate relative to.
【０００３】通常スピンドルモータには、モータ内部空
間ｄに存する不浄な空気がモータ外部、すなわちディス
ク室内空間ｐへ流出することを防止するためにシール装
置が設けられる。図３においては、玉軸受ｍ，ｎの外側
に、突状部を有する環状部材ｊとｋを組み合わせて構成
されたラビリンスシールｇが設けられている。このラビ
リンスシールｇでは、シャフトｃ側に固定された環状部
材ｊと、これに対向して配置され、ハブ部材ｂ側に固定
された環状部材ｋと、により生成される微小間隙ｒが、
これに連通するモータ内部空間ｄとディスク室内空間ｐ
とを、実質上封止するものである。[0003] Usually, the spindle motor is provided with a seal device for preventing unclean air existing in the motor internal space d from flowing out of the motor, ie, into the disk room space p. In FIG. 3, a labyrinth seal g configured by combining annular members j and k having protruding portions is provided outside the ball bearings m and n. In this labyrinth seal g, a minute gap r generated by an annular member j fixed to the shaft c side and an annular member k arranged opposite thereto and fixed to the hub member b side,
The motor internal space d and the disk indoor space p communicating with this
Are substantially sealed.
【０００４】[0004]
【考案が解決しようとする課題】しかしながら、このよ
うなラビリンスシールｇを、スピンドルモータに設ける
ためには、上述の環状部材ｊやｋを所要の加工精度に仕
上げる必要があり、またこれらを精度良くハブ部材ｂや
シャフトｃに組み付けなければならない。そうしない
と、充分なシール機能が得られないばかりでなく、スピ
ンドルモータの回転によるズレやロック等の障害を伴う
こととなる。このため、部品管理上あるいは組み立て
上、対応する慎重な配慮を必要とし、これらは生産コス
トを押し上げる要因となっていた。また他方、磁性流体
シール装置を用いる手段もあるが、注入される磁性流体
の飛散の問題や、それ自体の部品コストが比較的高価な
こともあり、これらを併せた種々解決すべき課題を有し
ている。However, in order to provide such a labyrinth seal g in a spindle motor, it is necessary to finish the above-mentioned annular members j and k to a required processing accuracy, and to provide them with high precision. Must be assembled to hub member b and shaft c. Otherwise, not only a sufficient sealing function cannot be obtained, but also a problem such as displacement or lock due to rotation of the spindle motor is involved. For this reason, corresponding care must be taken in parts management or assembly, and these factors have increased production costs. On the other hand, there is a means using a magnetic fluid sealing device, but there is a problem of scattering of the injected magnetic fluid and a relatively high cost of parts itself. doing.
【０００５】本考案は、上記事実に鑑みなされたもので
あって、その課題とするところは、比較的容易な加工精
度や組み付けによっても、確実で且つ高いシール性能が
得られ、所要の特性を確保することができる、生産性と
信頼性の高いスピンドルモータを提供することである。[0005] The present invention has been made in view of the above-mentioned facts, and the problem is that a reliable and high sealing performance can be obtained even with relatively easy processing accuracy and assembling. An object of the present invention is to provide a spindle motor with high productivity and reliability that can be secured.
【０００６】[0006]
【課題を解決するための手段】上記課題を達成するため
に、本考案のスピンドルモータでは、記録ディスクが装
着される椀形状のハブ部材と、円柱形状の静止部材と、
該静止部材の両端部においてそれぞれ該ハブ部材との間
に設けられた一対の玉軸受と、該静止部材における該一
対の玉軸受の間に設けられた電機子と、該電機子の外周
に対向し該ハブ部材の内周に設けられた界磁磁石とを有
し、該ハブ部材が該静止部材に対して相対回転駆動され
るスピンドルモータにおいて、該玉軸受の回転軸線方向
外方の該ハブ部材の内周面には、該ハブ部材と共に回転
する環状部材が装着され、該環状部材の回転軸線方向内
方には、該玉軸受の外輪端面外周部に当接する段部が突
出形成され、該玉軸受と該環状部材との間には、該段部
より径方向内方において径方向間隙部が規定され、更
に、該環状部材の内周面と該静止部材の外周面との間に
径方向間隙部に連通する回転軸線方向微小間隙部が規定
され、該環状部材の回転軸線方向における内外部を、実
質上封止するラビリンスシールとされ、かつ該径方向間
隙部の外周部には、該環状部材と該段部と該外輪端面と
で囲まれた環状凹部が形成されてなるものとしている。In order to achieve the above object, a spindle motor according to the present invention comprises a bowl-shaped hub member on which a recording disk is mounted, a cylindrical stationary member,
Between the hub member at each end of the stationary member.
And a pair of ball bearings provided on the stationary member.
An armature provided between a pair of ball bearings and an outer periphery of the armature
And a field magnet provided on the inner periphery of the hub member facing the hub member.
And, in a spindle motor in which the hub member is driven rotates relative to the stationary member, the rotation axis direction of該玉bearing
The inner peripheral surface of the outer hub member rotates together with the hub member.
The annular member to be mounted is attached ,
The stepped portion that comes into contact with the outer periphery of the outer ring end surface of the ball bearing projects
The stepped portion is formed between the ball bearing and the annular member.
A radial gap is defined further inward, and
Between the inner peripheral surface of the annular member and the outer peripheral surface of the stationary member.
Defines a minute gap in the rotation axis direction communicating with the radial gap
Is, the inner and outer portions in the rotation axis direction of the annular member, is a substantially sealed to the labyrinth seal, and between該径direction
On the outer peripheral portion of the gap, the annular member, the step portion, the outer ring end surface,
An annular concave portion surrounded by is formed .
【０００７】[0007]
【０００８】[0008]
【作用】環状部材が規定する回転軸線方向微小間隙部
は、流体が通りにくいラビリンスシールを形成する。し
かも、環状部材が規定する径方向間隙部は、玉軸受から
の潤滑剤等の不浄な空気が流出してもハブ部材の回転駆
動に伴う遠心力により、段部の方向へ押し戻されるよう
に作用し、不浄な空気はスピンドルモータ外部に通じる
回転軸線方向微小間隙部から遠ざかる方向へ流れる。こ
の場合、押し戻された不浄な空気に含まれるダスト微粒
子は、環状凹部に保持される。よって、環状部材の回転
軸線方向の内外部を回転軸線方向微小間隙部と環状凹部
を含む径方向間隙部の二つの間隙部により、玉軸受から
流出する不浄な空気がスピンドルモータ外部へ散出する
ことを防止できる。更に、環状部材には段部があるの
で、玉軸受の内輪に接触しないように高精度に位置決め
をして径方向間隙部を形成することができる。従って、
ラビリンスシールを生成する部材を、従来のような複雑
な形状にしなくても充分なシール性能が得られる。その
ため、これに伴う加工精度や組み付け精度は、それほど
高度のものが要求されず、歩留まりの良い、高い生産性
を有したスピンドルモータが得られる。[Function] A minute gap in the rotation axis direction defined by the annular member.
Forms a labyrinth seal through which fluid cannot pass. I
The radial gap defined by the annular member is
Even if unclean air such as lubricant flows out, the rotation of the hub
As the centrifugal force accompanying the movement pushes back toward the step
And the unclean air passes outside the spindle motor
It flows in the direction away from the minute gap in the direction of the rotation axis. This
In the case of, dust fines contained in the unclean air pushed back
The child is held in the annular recess. Therefore, rotation of the annular member
Axial inner and outer parts are minute gaps and annular recesses in the rotation axis direction.
From the ball bearing by two radial gaps including
Unclean air flowing out diffuses out of the spindle motor
Can be prevented. Furthermore, the annular member has a step
High-precision positioning to avoid contact with the inner ring of the ball bearing
To form a radial gap . Therefore,
Sufficient sealing performance can be obtained even if the member that generates the labyrinth seal does not have a complicated shape as in the related art. Therefore, the machining accuracy and the assembling accuracy involved are not required to be so high, and a spindle motor with high yield and high productivity can be obtained.
【０００９】[0009]
【００１０】[0010]
【実施例】本考案に従うスピンドルモータの１実施例に
ついて、図１及び図２を参照しつつ説明する。図１は、
本考案の実施例として、記録ディスク（例えば磁気ディ
スク）駆動用のスピンドルモータであり、その断面図を
示したものである。図１において、２は椀形状をなすハ
ブ部材であり、例えばアルミニウム材等により形成され
ている。このハブ部材１の鍔（つば）部３６の上へ、ド
ーナツ形状をなす記録ディスク１が装着される。記録デ
ィスク１は、リング状のスペーサ部材８を介して順次５
枚が積層して取り付けられ、その最上部にクランプ部材
９が装着される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a spindle motor according to the present invention will be described with reference to FIGS. FIG.
As an embodiment of the present invention, a spindle motor for driving a recording disk (for example, a magnetic disk) is shown in a sectional view. In FIG. 1, reference numeral 2 denotes a bowl-shaped hub member, which is formed of, for example, an aluminum material. The donut-shaped recording disk 1 is mounted on the flange portion 36 of the hub member 1. The recording disk 1 is sequentially connected to the recording disk 1 via a ring-shaped spacer member 8.
The sheets are stacked and mounted, and the clamp member 9 is mounted on the uppermost part.
【００１１】クランプ部材９は略円盤形状を有し、取付
ネジ１３により、ハブ部材２に設けられた孔部１４へ螺
着され締め付けられる。これにより、記録ディスク１は
ハブ部材２に対して一体的に保持、固定される。３は、
静止部材であるシャフトであり、例えば鉄材等を加工し
て形成されている。シャフト３は、その両端部が図示省
略の駆動装置にネジ等により固定される。シャフト３に
は、軸受部材である一対の玉軸受４、５が嵌め込まれて
おり、この玉軸受４、５を介してハブ２が装着される。
具体的には、図１における上側の玉軸受４の外輪部が、
ハブ部材２の内周面１７へ固着され、また下側の玉軸受
５の外輪部は、環状に形成されたスペーサ部材１５を介
し、ハブ部材２の下側に位置する内周面３３へ固着され
る。The clamp member 9 has a substantially disk shape, and is screwed into a hole 14 provided in the hub member 2 by a mounting screw 13 and tightened. Thereby, the recording disk 1 is integrally held and fixed to the hub member 2. 3 is
The shaft is a stationary member, and is formed by processing, for example, an iron material. Both ends of the shaft 3 are fixed to a driving device (not shown) by screws or the like. A pair of ball bearings 4 and 5 as bearing members are fitted into the shaft 3, and the hub 2 is mounted via the ball bearings 4 and 5.
Specifically, the outer ring portion of the upper ball bearing 4 in FIG.
The outer ring portion of the lower ball bearing 5 is fixed to the inner peripheral surface 17 of the hub member 2 via the spacer member 15 formed in an annular shape. Is done.
【００１２】ハブ部材２の内周面１７における略中央部
には、円筒形状を有すると共に所要極数に着磁された界
磁磁石７が、磁性材料を用いたヨーク部材１１を介して
貼着されている。一方、このシャフト３の略中央部に
は、この界磁磁石７に対向して配置された電機子６が嵌
め込まれている。電機子７は、電磁鋼板が所要枚数積層
して形成され、図示省略の歯部に巻線が巻回して形成さ
れる。この巻線の端末部にはリード線１２が接続され、
これはシャフト３に穿設された孔部３２を経てスピンド
ルモータ外部へ導出される。このリード線に所要の信号
電力が入力されると、電機子６と界磁磁石７との電磁作
用により、ハブ部材２が回転駆動される。A field magnet 7 having a cylindrical shape and magnetized to a required number of poles is adhered to a substantially central portion of an inner peripheral surface 17 of the hub member 2 via a yoke member 11 using a magnetic material. Have been. On the other hand, an armature 6 arranged opposite to the field magnet 7 is fitted into a substantially central portion of the shaft 3. The armature 7 is formed by laminating a required number of electromagnetic steel sheets, and is formed by winding a winding around a tooth part (not shown). A lead wire 12 is connected to the terminal of this winding,
This is led out of the spindle motor through a hole 32 formed in the shaft 3. When a required signal power is input to the lead wire, the hub member 2 is driven to rotate by the electromagnetic action of the armature 6 and the field magnet 7.
【００１３】図２は、この図１に示した玉軸受４の周辺
部を拡大した断面図である。この図２を併せて参照しつ
つ説明する。玉軸受４及び５のそれぞれスピンドルモー
タにおける外側、すなわち回転軸線１０方向の外方に
は、環状部材２０、２１が設けられている。これら環状
部材２０、２１は例えばアルミニウム材等が用いられて
形成されている。スピンドルモータ上側に位置する環状
部材２０については、図２に示すように、その外周面２
２がハブ部材２の内周面１７へ貼着されている。FIG. 2 is an enlarged sectional view of the periphery of the ball bearing 4 shown in FIG. This will be described with reference to FIG. Outside the ball bearings 4 and 5 in the spindle motor, that is, outside in the direction of the rotation axis 10, annular members 20 and 21 are provided. These annular members 20 and 21 are formed using, for example, an aluminum material or the like. As shown in FIG. 2, the annular member 20 located on the upper side of the spindle motor
2 is adhered to the inner peripheral surface 17 of the hub member 2.
【００１４】環状部材２０の内周面２５は、シャフト３
の表面である外周面２４を包囲するように対向すると共
に、この双方は近接して配置されるている。図２は回転
軸線１０方向の断面図であるが、これによって示される
環状部材２０の内周面２５と、シャフト３の外周面２４
と、により規定される回転軸線方向微小間隙部である微
小間隙部２７は、略矩形状を成している。本実施例で
は、この微小間隙部２７における間隙幅ｔは、０．０５
ｍｍであり、また間隙長Ｌは１．６９ｍｍに設定されて
いる。この微小間隙部２７がラビリンスシールとして機
能する。The inner peripheral surface 25 of the annular member 20 is
Are opposed to each other so as to surround the outer peripheral surface 24, which is the surface of the, and both are arranged close to each other. FIG. 2 is a cross-sectional view in the direction of the rotation axis 10, which shows the inner peripheral surface 25 of the annular member 20 and the outer peripheral surface 24 of the shaft 3.
The minute gap 27, which is a minute gap in the rotation axis direction defined by the above, has a substantially rectangular shape. In this embodiment, the gap width t in the minute gap 27 is 0.05
mm, and the gap length L is set to 1.69 mm. The minute gap 27 functions as a labyrinth seal.
【００１５】環状部材２０の下側面４１には、段部４２
が設けられており、この段部４２の下面と外輪部４４
（玉軸受４）端面外周部とが当接して、回転軸線１０方
向の位置決めがなされる。また、この段部４２により、
玉軸受４の上側面４７と環状部材２０の下側面４１との
径方向間隙部である間隙部４５が規定され、かつ環状部
材２０と段部４２と外輪部４４端面とで囲まれる環状凹
部が規定される。この間隙部４５により、環状部材２０
は内輪部４３との接触を防止する。また、この間隙部４
５は、次のような機能を併せ持っている。すなわち、仮
に玉軸受４に含まれる潤滑剤が上側端部へ流出してもハ
ブ部材２の回転駆動に伴い、遠心力により潤滑剤は環状
部材２０の段部４２の方向へ押し戻され、その凹部に保
持されるように作用する。従って、この間隙部４５に連
通する微少間隙部２７を経て、こうした潤滑剤等を含む
不浄な空気は、容易にスピンドルモータ外部５１へ散出
することはない。The lower surface 41 of the annular member 20 has a step 42
Are provided, and the lower surface of the step portion 42 and the outer ring portion 44 are provided.
(Ball bearing 4) The outer peripheral portion of the end face abuts, and positioning in the direction of the rotation axis 10 is performed. Also, by this step portion 42,
Between the upper surface 47 of the ball bearing 4 and the lower surface 41 of the annular member 20;
A gap portion 45 that is a radial gap portion is defined , and an annular portion is provided.
Annular recess surrounded by the material 20, the step portion 42, and the end surface of the outer ring portion 44
Part is Ru are defined. This gap 45 allows the annular member 20
Prevents contact with the inner ring 43. The gap 4
5 also has the following functions. That is, even if the lubricant contained in the ball bearing 4 flows out to the upper end, the lubricant is pushed back in the direction of the step 42 of the annular member 20 due to the centrifugal force due to the rotation of the hub member 2 , and the concave portion thereof is formed. Keep
Acts to be carried . Therefore, the unclean air containing the lubricant and the like does not easily diffuse to the outside 51 of the spindle motor via the minute gap 27 communicating with the gap 45.
【００１６】一方、スピンドルモータ下側に位置する環
状部材２１は、前記環状部材２０と同様の形状寸法に設
定されており、玉軸受５の回転軸線１０方向の外方に位
置付けられる。そして、環状部材２１は、その外周面２
３がスペーサ部材１５の内周面１６に固着される。環状
部材２１の内周面２６は、シャフト３の外周面２４に対
して包囲するように近接して設けられる。前記環状部材
２０と同様に、環状部材２１とシャフト３の外周面２４
とにより規定される微小間隙部２８がラビリンスシール
として機能する。On the other hand, the annular member 21 located on the lower side of the spindle motor is set to have the same shape and size as the annular member 20, and is positioned outward of the ball bearing 5 in the direction of the rotation axis 10. The annular member 21 has its outer peripheral surface 2
3 is fixed to the inner peripheral surface 16 of the spacer member 15. The inner peripheral surface 26 of the annular member 21 is provided close to and surrounds the outer peripheral surface 24 of the shaft 3. Similarly to the annular member 20, the annular member 21 and the outer peripheral surface 24 of the shaft 3 are provided.
Function as a labyrinth seal.
【００１７】こうして、スピンドルモータ内部空間に存
する不浄な空気が、外部であるディスク室内空間５１へ
散出することが効果的に防止される。微小間隙部２７、
２８における間隙幅ｔに対する間隙長Ｌの比、すなわち
Ｌ／ｔは、本実施例のスピンドルモータの場合、３３．
８である。この比が３０以上あることにより、ラビリン
スシールの効果がより向上される。ちなみに、本実施例
のスピンドルモータから散出されるダストの量を、ダス
トカウンター装置で計測した結果を述べると、０．３ｕ
ｍの大きさのダストが、１立方フィートの空間内にて平
均１３５個であった。これに対して図３に示した同容量
の従来のスピンドルモータでは、８２０であった。In this way, it is possible to effectively prevent the unclean air existing in the inner space of the spindle motor from escaping into the outer disk space 51. Minute gap 27,
28, the ratio of the gap length L to the gap width t, that is, L / t, is 33.
8 When the ratio is 30 or more, the effect of the labyrinth seal is further improved. Incidentally, the result of measuring the amount of dust scattered from the spindle motor of the present embodiment with a dust counter device is as follows.
An average of 135 m-sized dust particles occupied one cubic foot of space. On the other hand, in the conventional spindle motor of the same capacity shown in FIG.
【００１８】以上、本考案に従うスピンドルモータの１
実施例について説明したが、本考案はかかる実施例に限
定されるものでなく、本考案の範囲を逸脱することなく
種々の変形乃至修正が可能である。例えば、本実施例の
スピンドルモータでは、このラビリンスシールを形成す
るために、スピンドルモータの上下に環状部材２０、２
１の二つを設けて説明したが、少なくとも一つを設け、
必要に応じて他のシール手段を併用してもよい。また、
軸受部材として玉軸受を用いたが、これに限定されず動
圧軸受やその他の軸受を用いても良く選定自在である。
その他、環状部材に用いる材質等も設計自由である。As described above, one of the spindle motors according to the present invention is described.
Although the embodiment has been described, the present invention is not limited to the embodiment, and various changes and modifications can be made without departing from the scope of the present invention. For example, in the spindle motor of the present embodiment, in order to form the labyrinth seal, annular members 20, 2
Although the description is provided by providing two of one, at least one is provided,
If necessary, other sealing means may be used in combination. Also,
Although a ball bearing was used as the bearing member, the present invention is not limited to this, and a dynamic pressure bearing or other bearings may be used and can be selected freely.
In addition, the material used for the annular member can be freely designed.
【００１９】[0019]
【考案の効果】本考案のスピンドルモータは、環状部材
が、環状部材の回転軸線方向の内外部を回転軸線方向微
小間隙部と環状凹部を含む径方向間隙部の二つの間隙部
により、玉軸受から流出する不浄な空気がスピンドルモ
ータ外部へ散出することを防止できる。この場合に、環
状部材には段部があるので、玉軸受の内輪に接触しない
ように位置決めをして径方向間隙部を形成することがで
きる。従って、ラビリンスシールを生成する部材を、従
来のような複雑な形状にしなくても充分なシール性能が
得られる。そのため、これに伴う加工精度や組み付け精
度は、それほど高度のものが要求されず、歩留まりの良
い、高い生産性を有したスピンドルモータが得られる。[Effect of the Invention] The spindle motor of the present invention is an annular member.
However, the inside and outside of the annular member in the rotation axis direction
Two gaps, a small gap and a radial gap including an annular recess
As a result, unclean air flowing out of the ball bearings
Can be prevented from spreading outside the data. In this case, the ring
The stepped part does not touch the inner ring of the ball bearing
Positioning to form a radial gap.
Wear. Therefore, the member that generates the labyrinth seal is
Sufficient sealing performance even without complicated shapes
can get. Therefore, the processing accuracy and assembly precision
The degree is not so high, and the yield is good.
Thus, a spindle motor having high productivity can be obtained.
【図１】本考案に従うスピンドルモータの１実施例を示
す断面図である。FIG. 1 is a sectional view showing an embodiment of a spindle motor according to the present invention.
【図２】図１に示したスピンドルモータの一部を拡大し
て示した断面図である。FIG. 2 is an enlarged sectional view showing a part of the spindle motor shown in FIG. 1;
【図３】従来のスピンドルモータを示す断面図である。FIG. 3 is a sectional view showing a conventional spindle motor.
１ 記録ディスク ２ ハブ部材 ３ シャフト（静止部材） ４ 玉軸受（軸受部材） ５ 玉軸受（軸受部材） ６ 電機子 ７ 界磁磁石 １０ 回転軸線 ２０ 環状部材 ２１ 環状部材 ２７ 微小間隙部 ２８ 微小間隙部 DESCRIPTION OF SYMBOLS 1 Recording disk 2 Hub member 3 Shaft (stationary member) 4 Ball bearing (bearing member) 5 Ball bearing (bearing member) 6 Armature 7 Field magnet 10 Rotation axis 20 Annular member 21 Annular member 27 Micro gap 28 Micro gap
Claims (1)
部材と、円柱形状の静止部材と、該静止部材の両端部に
おいてそれぞれ該ハブ部材との間に設けられた一対の玉
軸受と、該静止部材における該一対の玉軸受の間に設け
られた電機子と、該電機子の外周に対向し該ハブ部材の
内周に設けられた界磁磁石とを有し、 該 ハブ部材が該静止部材に対して相対回転駆動されるス
ピンドルモータにおいて、該玉軸受の回転軸線方向外方の該ハブ部材の内周面に
は、該ハブ部材と共に回転する 環状部材が装着され、 該環状部材の回転軸線方向内方には、該玉軸受の外輪端
面外周部に当接する段部が突出形成され、該玉軸受と該
環状部材との間には、該段部より径方向内方において径
方向間隙部が規定され、更に、該環状部材の内周面と該
静止部材の外周面との間に径方向間隙部に連通する回転
軸線方向微小間隙部が規定され、該環状部材の回転軸線
方向における内外部を、実質上封止するラビリンスシー
ルとされ、かつ該径方向間隙部の外周部には、該環状部
材と該段部と該外輪端面とで囲まれた環状凹部が形成さ
れた、ことを特徴とするスピンドルモータ。1. A bowl-shaped hub member on which a recording disk is mounted, a cylindrical stationary member, and two ends of the stationary member.
A pair of balls respectively provided between the hub member
A bearing, provided between the pair of ball bearings in the stationary member;
Armature and the hub member facing the outer periphery of the armature.
And a field magnet provided on an inner circumference, the spindle motor in which the hub member is driven rotates relative to the stationary member, the inner peripheral surface of the hub member rotational axis outwardly of該玉bearing To
An annular member that rotates together with the hub member is mounted, and an inner ring end of the ball bearing is provided inside the annular member in the rotation axis direction.
A stepped portion that contacts the outer peripheral portion of the surface is formed so as to protrude.
Between the annular member and the radially inward of the step
A direction gap is defined, and the inner peripheral surface of the annular member and the
Rotation communicating with the radial gap between the stationary member and the outer peripheral surface
An axial minute clearance is defined , a labyrinth seal for substantially sealing the inside and outside of the annular member in the rotation axis direction is provided , and an outer peripheral portion of the radial gap includes the annular portion.
An annular recess surrounded by the material, the step, and the end surface of the outer ring is formed.
Spindle motor was, characterized in that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991110802U JP2554943Y2 (en) | 1991-12-18 | 1991-12-18 | Spindle motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991110802U JP2554943Y2 (en) | 1991-12-18 | 1991-12-18 | Spindle motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0555772U JPH0555772U (en) | 1993-07-23 |
| JP2554943Y2 true JP2554943Y2 (en) | 1997-11-19 |
Family
ID=14545026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1991110802U Expired - Fee Related JP2554943Y2 (en) | 1991-12-18 | 1991-12-18 | Spindle motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2554943Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015149111A (en) * | 2014-02-06 | 2015-08-20 | セイコーインスツル株式会社 | Rolling bearing device and information recording device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0747982Y2 (en) * | 1988-06-29 | 1995-11-01 | 日本電産株式会社 | In-hub type brushless spindle motor |
-
1991
- 1991-12-18 JP JP1991110802U patent/JP2554943Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0555772U (en) | 1993-07-23 |
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