JPH06178488A - Spindle motor - Google Patents
Spindle motorInfo
- Publication number
- JPH06178488A JPH06178488A JP34976792A JP34976792A JPH06178488A JP H06178488 A JPH06178488 A JP H06178488A JP 34976792 A JP34976792 A JP 34976792A JP 34976792 A JP34976792 A JP 34976792A JP H06178488 A JPH06178488 A JP H06178488A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- hub
- motor
- dynamic pressure
- peripheral surface
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は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 a spindle motor.
【０００２】[0002]
【従来の技術】従来、磁気ディスクや光ディスク等の記
録ディスクを回転駆動するためのスピンドルモータとし
て、図６に例示するものが公知である。2. Description of the Related Art Conventionally, as a spindle motor for rotatably driving a recording disk such as a magnetic disk or an optical disk, the one exemplified in FIG. 6 is known.
【０００３】このスピンドルモータでは、シャフトｃの
一端部ｂをブラケットａに固着すると共にシャフトｃの
他端部ｆに円環状スラスト体ｇを固着して、ハブｅの凹
部ｈにスラスト体ｇを内装して施蓋部材ｉにて施蓋し、
さらに、ハブｅの円筒部ｄを、動圧流体ラジアル軸受部
ｋ，ｋにてシャフトｃに回転自在に枢支すると共に、ハ
ブｅを、動圧流体スラスト軸受部ｍ，ｍにて軸心方向所
定位置に保持していた。In this spindle motor, one end b of the shaft c is fixed to the bracket a, an annular thrust body g is fixed to the other end f of the shaft c, and the thrust body g is provided in the recess h of the hub e. And cover with the cover member i,
Further, the cylindrical portion d of the hub e is rotatably supported on the shaft c by the hydrodynamic fluid radial bearing portions k, k, and the hub e is axially supported by the hydrodynamic fluid thrust bearing portions m, m. It was held in place.
【０００４】この動圧流体ラジアル軸受部ｋ，ｋは、シ
ャフトｃの外周面に形成された動圧発生溝ｊ，ｊと、円
筒部ｄの内周面とシャフトｃの外周面との間に充填され
た動圧発生用流体である油と、からなる。また、動圧流
体スラスト軸受部ｍ，ｍは、スラスト体ｇの両端面に夫
々形成された動圧発生溝と、スラスト体ｇと凹部ｈ及び
施蓋部材ｉとの間に充填された動圧発生用流体である油
と、からなる。The hydrodynamic radial bearings k, k are provided between the dynamic pressure generating grooves j, j formed on the outer peripheral surface of the shaft c and the inner peripheral surface of the cylindrical portion d and the outer peripheral surface of the shaft c. It is composed of oil, which is a fluid for dynamic pressure generation filled. The hydrodynamic fluid thrust bearings m, m are the dynamic pressure generating grooves formed on both end surfaces of the thrust body g, and the dynamic pressure filled between the thrust body g, the recess h and the cover member i. It is composed of oil, which is a generation fluid.
【０００５】[0005]
【発明が解決しようとする課題】ところが、従来のスピ
ンドルモータでは、上記動圧発生用の油等が、動圧流体
ラジアル軸受部ｋ及び動圧流体スラスト軸受部ｍから軸
方向外方へ、にじみ出したり、飛散したりすると、その
まま隙間部ｒ，ｓからモータ外部へ漏れ出してしまう問
題があり、ディスク室等を汚染してしまう虞があった。However, in the conventional spindle motor, the oil or the like for generating the dynamic pressure oozes outward from the dynamic fluid radial bearing portion k and the dynamic fluid thrust bearing portion m in the axial direction. If it is scattered or scattered, there is a problem that it leaks to the outside of the motor as it is from the gaps r and s, which may contaminate the disk chamber or the like.
【０００６】そこで、本発明では、モータの軸受に用い
られる動圧発生用油等が、モータ外部へ漏れ出すのを防
止できるスピンドルモータを提供することを目的とす
る。Therefore, it is an object of the present invention to provide a spindle motor capable of preventing the dynamic pressure generating oil used for the bearing of the motor from leaking out of the motor.
【０００７】[0007]
【課題を解決するための手段】上述の目的を達成するた
めに、本発明は、動圧流体軸受部を備えたスピンドルモ
ータに於て、ハブの内部に、飛散した油等を収容して保
持する油溜りを凹設したものである。In order to achieve the above object, the present invention is a spindle motor having a hydrodynamic bearing, in which a scattered oil or the like is accommodated and held inside a hub. It is a recessed oil reservoir.
【０００８】[0008]
【作用】モータの軸受に用いられる動圧発生用油等が、
該軸受の外部へにじみ出したり、飛散したりすると、回
転するハブの遠心力によって、ハブ内部を外径方向へ移
動して油溜りに収容・保持され、上記油等がモータ外部
へ漏れ出さない。[Operation] The dynamic pressure generating oil used for the bearing of the motor is
If the bearing oozes or scatters to the outside of the bearing, the centrifugal force of the rotating hub moves it inside the hub in the outer diameter direction and is stored and held in the oil sump, so that the oil does not leak to the outside of the motor. .
【０００９】[0009]
【実施例】以下、実施例を示す図面に基づいて本発明を
詳説する。The present invention will be described in detail below with reference to the drawings illustrating the embodiments.
【００１０】図１と図２は本発明に係るスピンドルモー
タを例示し、このモータは、例えば、磁気ディスクや光
ディスク等の記録ディスクを回転駆動するために用いら
れる。1 and 2 exemplify a spindle motor according to the present invention, and this motor is used for rotating a recording disk such as a magnetic disk or an optical disk.
【００１１】しかして、１はブラケットであって、ブラ
ケット１は、フランジ部２と、フランジ部２の中央部に
立設された円筒状ボス部３と、を有している。However, 1 is a bracket, and the bracket 1 has a flange portion 2 and a cylindrical boss portion 3 provided upright in the center of the flange portion 2.
【００１２】ボス部３の厚肉状周囲壁３ａの外周面に
は、ステータコア６にステータコイル７を巻設してなる
ステータ８が取付けられる。A stator 8 formed by winding a stator coil 7 around a stator core 6 is attached to the outer peripheral surface of the thick peripheral wall 3a of the boss portion 3.
【００１３】このボス部３の軸心方向の小径孔部19ａ及
び大径孔部19ｂのうち、小径孔部19ａには円筒状スリー
ブ５が挿入固着される。このスリーブ５の基端面５ａに
は、軸心方向のボルト孔22が形成される。Of the small diameter hole portion 19a and the large diameter hole portion 19b of the boss portion 3 in the axial direction, the cylindrical sleeve 5 is inserted and fixed in the small diameter hole portion 19a. A bolt hole 22 in the axial direction is formed in the base end surface 5a of the sleeve 5.
【００１４】また、大径孔部19ｂには円板状の押え部材
20が嵌め込まれ、この押え部材20には、上記ボルト孔22
に対応する軸心方向の座グリ部付取付孔21が貫設され
る。この取付孔21を介して、図示省略のボルトをボルト
孔22に螺着することにより、押え部材20がスリーブ５に
固定される。29は連通孔で、スラスト体10等の表面に付
着した油の気泡を取付孔21の側へ（押え部材20の嵌込時
に）抜くための孔である。Further, a disc-shaped pressing member is provided in the large-diameter hole portion 19b.
20 is fitted into the holding member 20 and the bolt hole 22
A mounting hole 21 with a counterbore portion in the axial direction corresponding to the is formed. The pressing member 20 is fixed to the sleeve 5 by screwing a bolt (not shown) into the bolt hole 22 through the mounting hole 21. A communication hole 29 is a hole for removing oil bubbles adhering to the surface of the thrust body 10 and the like to the mounting hole 21 side (when the pressing member 20 is fitted).
【００１５】スリーブ５は、第１周面24ａ，凹周面24ｂ
及び第２周面24ｃからなる軸心孔23を有し、このスリー
ブ５には、シャフト４が、動圧流体ラジアル軸受部Ｒ，
Ｒにて、回転自在に枢支される。The sleeve 5 has a first peripheral surface 24a and a concave peripheral surface 24b.
And a shaft center hole 23 composed of the second peripheral surface 24c. The shaft 5 is provided in the sleeve 5 with the dynamic pressure fluid radial bearing portion R,
At R, it is rotatably supported.
【００１６】動圧流体ラジアル軸受部Ｒは、軸心孔23と
該軸心孔23に対応するシャフト４の外周面との間に充填
された動圧発生用流体である油等と、第１周面24ａ及び
第２周面24ｃに対応してシャフト４の外周面に形成され
た（図示省略の）動圧発生溝と、からなる。The hydrodynamic fluid radial bearing portion R includes oil, which is a fluid for dynamic pressure generation, filled between the shaft center hole 23 and the outer peripheral surface of the shaft 4 corresponding to the shaft center hole 23, and the first And a dynamic pressure generating groove (not shown) formed on the outer peripheral surface of the shaft 4 corresponding to the peripheral surface 24a and the second peripheral surface 24c.
【００１７】なお、この動圧発生溝は、シャフト４の外
周面でなく、第１周面24ａ及び第２周面24ｃに形成して
もよい。The dynamic pressure generating groove may be formed not on the outer peripheral surface of the shaft 4 but on the first peripheral surface 24a and the second peripheral surface 24c.
【００１８】また、シャフト４の基端部には円環状スラ
スト体10が圧入等により固定される。スラスト体10は、
スリーブ５の基端面５ａ側に形成された凹部41に内装さ
れ、スラスト体10の押え部材対応端面26と、押え部材20
のスラスト体対応面25が対面し、凹部41のスラスト対応
端面28と、スラスト体10のスリーブ対応面27が対面す
る。An annular thrust body 10 is fixed to the base end of the shaft 4 by press fitting or the like. Thrust body 10 is
The end surface 26 of the thrust body 10 corresponding to the holding member and the holding member 20 are housed in the recess 41 formed on the base end surface 5a side of the sleeve 5.
The thrust body corresponding surface 25 faces each other, and the thrust corresponding end surface 28 of the recess 41 and the sleeve corresponding surface 27 of the thrust body 10 face each other.
【００１９】このスラスト体10が、動圧流体スラスト軸
受部Ｓ，Ｓにて、軸心方向所定位置に位置決めされた状
態で回転可能に保持される。The thrust body 10 is rotatably held by the hydrodynamic fluid thrust bearing portions S, S while being positioned at a predetermined position in the axial direction.
【００２０】動圧流体スラスト軸受部Ｓは、凹部41とス
ラスト体10との間及びスラスト体10と押え部材20との間
に充填された動圧発生用流体である油等と、押え部材対
応端面26及びスリーブ対応面27に形成された（図示省略
の）動圧発生溝と、からなる。The hydrodynamic fluid thrust bearing portion S corresponds to a pressing member, such as oil which is a fluid for generating a dynamic pressure filled between the recess 41 and the thrust body 10 and between the thrust body 10 and the pressing member 20. And a dynamic pressure generating groove (not shown) formed in the end surface 26 and the sleeve-corresponding surface 27.
【００２１】なお、この動圧発生溝は、押え部材対応端
面26でなくスラスト体対応面25に形成してもよく、ま
た、スリーブ対応面27でなくスラスト対応端面28に形成
してもよい。The dynamic pressure generating groove may be formed not on the pressing member-corresponding end surface 26 but on the thrust body-corresponding surface 25, or on the thrust-corresponding end surface 28 instead of the sleeve-corresponding surface 27.
【００２２】ところで、上記動圧発生用の油は、押え部
材20を大径孔部19ｂに嵌め込む前に充填される。その充
填された油の中に気泡があると、押え部材20を大径孔部
19ｂに嵌め込む際、該気泡を、上記連通孔29を通じて取
付孔21からモータ外部へ抜け出させることができるよう
になっている。By the way, the oil for generating the dynamic pressure is filled before the pressing member 20 is fitted into the large diameter hole portion 19b. If there are air bubbles in the filled oil, the pressing member 20 will be
When fitted in 19b, the air bubbles can be made to escape from the mounting hole 21 to the outside of the motor through the communication hole 29.
【００２３】すなわち、押え部材20を嵌め込むと、大径
孔部19ｂは閉塞されるが、その際、油の充填部と、押え
部材20のスラスト体対応面25との隙間に空気が残る。こ
れが油の中へ気泡となって含まれることとなる。That is, when the holding member 20 is fitted, the large diameter hole portion 19b is closed, but at that time, air remains in the gap between the oil filling portion and the thrust body corresponding surface 25 of the holding member 20. This will be contained as bubbles in the oil.
【００２４】そしてスピンドルモータの温度上昇によ
り、油中の気泡が膨張して、後述するスリーブ５から油
が漏れ出るが、上述の構造によって、これを防止でき
る。When the temperature of the spindle motor rises, air bubbles in the oil expand, and the oil leaks from the sleeve 5 described later. This can be prevented by the above-mentioned structure.
【００２５】一方、シャフト４の一端部には碗型のハブ
９が固定されて、ハブ９，シャフト４及びスラスト体10
が一体化され、スリーブ５に対して一体回転する。On the other hand, a bowl-shaped hub 9 is fixed to one end of the shaft 4, and the hub 9, the shaft 4 and the thrust body 10 are provided.
Are integrated and rotate integrally with the sleeve 5.
【００２６】ハブ９は、シャフト４が取付けられた円盤
状部11と、周壁部12からなり、周壁部12の外周面には記
録ディスク13…が、クランプ具14を介してビス等にて装
着される。15はディスク装着時のハブ廻り止め用の孔で
ある。The hub 9 comprises a disk-shaped portion 11 to which the shaft 4 is attached and a peripheral wall portion 12. The outer peripheral surface of the peripheral wall portion 12 has recording disks 13 ... Attached by screws or the like via clamps 14. To be done. Reference numeral 15 is a hole for stopping the rotation of the hub when the disc is mounted.
【００２７】また、周壁部12の外周縁に形成された外鍔
部12ａには、円筒状ヨーク16を介してロータマグネット
17が取付けられ、ステータコア６の外周面とロータマグ
ネット17の内周面が近接対峙する。18はリード線で、こ
のリード線18を介して送られる制御電流等にてステータ
８が励磁する。The outer flange 12a formed on the outer peripheral edge of the peripheral wall 12 has a rotor magnet through a cylindrical yoke 16.
17 is attached, and the outer peripheral surface of the stator core 6 and the inner peripheral surface of the rotor magnet 17 closely face each other. Reference numeral 18 is a lead wire, and the stator 8 is excited by a control current or the like sent through the lead wire 18.
【００２８】しかして、図２に示すように、ハブ９の内
部には、環状受部材30により、所定の深さＬ及び間隔Ｔ
の環状の油溜り31が凹設される。Therefore, as shown in FIG. 2, a predetermined depth L and interval T are provided inside the hub 9 by the annular receiving member 30.
The annular oil sump 31 is provided as a recess.
【００２９】具体的には、図２に於て、受部材30は、そ
の外周面に、接合面33ａと、該接合面33ａよりも（上記
間隔Ｔに対応して）所定半径だけ小さい段付部33ｂと、
を有している。Specifically, in FIG. 2, the receiving member 30 has a joint surface 33a on the outer peripheral surface thereof, and a stepped portion smaller than the joint surface 33a by a predetermined radius (corresponding to the interval T). Part 33b,
have.
【００３０】この接合面33ａを、ハブ９の周壁部12の内
周面に、圧入又は接着等にて嵌込固着し、周壁部12の内
周面と段付部33ｂとで、軸方向外方（受部材30の先端面
32側）に開口する油溜り31が形成される。The joint surface 33a is fitted and fixed to the inner peripheral surface of the peripheral wall portion 12 of the hub 9 by press fitting or adhesion, so that the inner peripheral surface of the peripheral wall portion 12 and the stepped portion 33b are axially outside. Direction (tip surface of receiving member 30
The oil sump 31 opening to the (32 side) is formed.
【００３１】なお、周壁部12の内周面に段付部を形成し
て、受部材30の外周面を同一径にし、両者を接合して油
溜り31を形成してもよい。Alternatively, a stepped portion may be formed on the inner peripheral surface of the peripheral wall portion 12, the outer peripheral surface of the receiving member 30 may have the same diameter, and the two may be joined to form the oil sump 31.
【００３２】また、受部材30の先端面32の内周角部に
は、所定傾斜角度のテーパ部34が形成され、このテーパ
部34とハブ９の円盤状部11の端面35とで形成される間隙
部は、動圧流体ラジアル軸受部Ｒ等から連通路Ｇへ飛散
又はにじみ出した油等を捕捉しやすいように、内径側に
拡がっている。Further, a taper portion 34 having a predetermined inclination angle is formed at an inner peripheral corner portion of the tip surface 32 of the receiving member 30, and the taper portion 34 and the end surface 35 of the disk-shaped portion 11 of the hub 9 are formed. The gap portion is expanded to the inner diameter side so that oil or the like scattered or oozing out from the dynamic fluid radial bearing portion R or the like into the communication passage G can be easily captured.
【００３３】連通路Ｇは、ブラケット１のボス部３の先
端面38と、スリーブ５の先端面５ｂと、スリーブ５の先
端面５ｂ側に形成された凹部37と、凹部37に臨むように
円盤状部11に形成された凸状周壁部36と、円盤状部11の
端面35とで、形成される。The communicating passage G has a tip surface 38 of the boss portion 3 of the bracket 1, a tip surface 5b of the sleeve 5, a recess 37 formed on the tip surface 5b side of the sleeve 5, and a disk so as to face the recess 37. It is formed by the convex peripheral wall portion 36 formed on the plate-shaped portion 11 and the end surface 35 of the disk-shaped portion 11.
【００３４】この連通路Ｇに、動圧流体ラジアル軸受部
Ｒ等の油等が飛散又はにじみ出すと、回転するハブ９の
遠心力によって、油等が外径方向に向かって連通路Ｇ内
を移動し、受部材30の先端面32と円盤状部11の端面35と
の間の間隙部42を通って、油溜り31内に収容され保持さ
れる。When oil or the like in the dynamic pressure fluid radial bearing portion R or the like is scattered or oozes into the communication passage G, the centrifugal force of the rotating hub 9 causes the oil or the like to flow in the communication passage G in the outer diameter direction. It moves and passes through a gap 42 between the tip surface 32 of the receiving member 30 and the end surface 35 of the disk-shaped portion 11 and is accommodated and held in the oil sump 31.
【００３５】ひとたび油溜り31に収容された油は、容易
に間隙部42から流出しない。従ってスピンドルモータ外
部、すなわち記録ディスク13側へ油が漏れ出ることが効
果的に阻止されるため、ディスク室を汚染することがな
い。The oil once stored in the oil sump 31 does not easily flow out from the gap 42. Therefore, it is possible to effectively prevent the oil from leaking to the outside of the spindle motor, that is, to the side of the recording disk 13, so that the disk chamber is not contaminated.
【００３６】なお、油溜り31の間隔Ｔは、上記油が表面
張力によって球体状となる径Ｄ（図３参照）、ないし
は、毛細管現象により作用する「濡れ」現象の最大高さ
寸法よりも小さく設定するのが望ましい。具体的には、
Ｔ≦ 0.1mmに設定される。The interval T between the oil sumps 31 is smaller than the diameter D (see FIG. 3) at which the oil becomes spherical due to surface tension, or the maximum height dimension of the "wetting" phenomenon which is caused by the capillary phenomenon. It is desirable to set. In particular,
It is set to T ≤ 0.1 mm.
【００３７】このようにすれば、油溜り31内に入った油
は、毛細管現象により、周壁部12の内周面と段付部33ｂ
とで捕捉され、容易に外部へ流れ出すことが効果的に防
止される。By doing so, the oil that has entered the oil sump 31 is caused by the capillary phenomenon to the inner peripheral surface of the peripheral wall portion 12 and the stepped portion 33b.
It is effectively prevented from being captured by and easily flowing out.
【００３８】また、スリーブ５の（凹部37側の）内周縁
部は、軸心方向内方に縮径するテーパ面39に形成され、
このテーパ面39に対応させて、シャフト４の外周面に、
外径方向に開口する凹周溝40が形成される。Further, the inner peripheral edge of the sleeve 5 (on the side of the recess 37) is formed into a tapered surface 39 whose diameter decreases inward in the axial direction.
Corresponding to this tapered surface 39, on the outer peripheral surface of the shaft 4,
A concave circumferential groove 40 that opens in the outer diameter direction is formed.
【００３９】凹周溝40の軸心方向内方側は、スリーブ５
の第１周面24ａの先端部にて、約半分程度覆われてい
る。The sleeve 5 is provided on the inner side in the axial direction of the concave circumferential groove 40.
The tip of the first peripheral surface 24a is covered by about half.
【００４０】このようにすれば、動圧流体ラジアル軸受
部Ｒ等から漏れ出た油は、図４の符号Ｊ1 で示す如く、
第１周面24ａの先端部と凹周溝40によって、表面張力で
丸くなり、容易に連通路Ｇ方向へ、にじみ出すことがな
い。In this way, the oil leaking from the hydrodynamic radial bearing portion R, etc., is as shown by the symbol J 1 in FIG.
Due to the tip of the first peripheral surface 24a and the concave peripheral groove 40, the first peripheral surface 24a is rounded by the surface tension and does not easily exude in the direction of the communication path G.
【００４１】さらに、凹周溝40内で油が増えても、符号
Ｊ2 で示すように、凹周溝40とテーパ面39によって、油
が表面張力で丸くなり、容易に連通路Ｇ方向へ、にじみ
出すことがない。Further, even if the oil increases in the concave circumferential groove 40, the oil is rounded by the surface tension by the concave circumferential groove 40 and the tapered surface 39 as shown by the reference numeral J 2 , so that the oil can be easily moved in the communicating path G direction. , Never ooze out.
【００４２】なお、シャフト４の外周面及びテーパ面39
の符号Ｆで示す範囲に、油をはじく撥油剤を塗布するも
好ましく、油漏れを一層防止することができる。The outer peripheral surface of the shaft 4 and the tapered surface 39
It is also preferable to apply an oil-repellent agent that repels oil to the range indicated by the symbol F, so that oil leakage can be further prevented.
【００４３】ところで、図２に示すように、モータ組立
後において、スリーブ５の凹部37の端面37ａとハブ９の
凸状周壁部36の端面36ａとの間の間隔Ｈ1 は、スリーブ
５の先端面５ａ及びブラケット１の先端面38とハブ９の
端面35との間の間隔Ｈ2 よりも大になるように設定され
る。By the way, as shown in FIG. 2, after the motor is assembled, the distance H 1 between the end surface 37a of the concave portion 37 of the sleeve 5 and the end surface 36a of the convex peripheral wall portion 36 of the hub 9 is equal to the tip of the sleeve 5. It is set to be larger than the distance H 2 between the surface 5a and the end surface 38 of the bracket 1 and the end surface 35 of the hub 9.
【００４４】従って、モータ組立の際、図５に示すよう
に、スリーブ５の軸心孔23に上記油を塗布した後、仮想
線の如くハブ９と一体化したシャフト４を、実線で図示
するように軸心孔23に嵌め込むと、スリーブ５の先端面
５ｂとハブ９の端面35が当接して、凹部37の端面37ａと
ハブ９の凸状周壁部36の端面36ａとの間に隙間Ｅがで
き、これ以上隙間Ｅは小さくならない。Therefore, when assembling the motor, as shown in FIG. 5, the shaft 4 integrated with the hub 9 is shown by a solid line after the oil is applied to the shaft center hole 23 of the sleeve 5 as shown by an imaginary line. When it is fitted into the axial hole 23, the tip end surface 5b of the sleeve 5 and the end surface 35 of the hub 9 come into contact with each other, and a gap is formed between the end surface 37a of the recess 37 and the end surface 36a of the convex peripheral wall portion 36 of the hub 9. E is formed, and the gap E does not become smaller.
【００４５】この隙間Ｅを、上記油が表面張力によって
球体状となる径Ｄ（図３参照）よりも大きく設定して、
凹部37の端面37ａとハブ９の凸状周壁部36の端面36ａと
の間で毛細管現象が起きないようにする。The gap E is set to be larger than the diameter D (see FIG. 3) at which the oil becomes spherical due to surface tension,
Capillary phenomenon is prevented from occurring between the end surface 37a of the concave portion 37 and the end surface 36a of the convex peripheral wall portion 36 of the hub 9.
【００４６】これにより、スリーブ５の軸心孔23に塗布
された油が、テーパ面39側にあふれ出ても、毛細管現象
で外径方向へにじみ移動するのを防止できる。As a result, even if the oil applied to the shaft center hole 23 of the sleeve 5 overflows to the taper surface 39 side, it can be prevented from moving outward in the radial direction due to the capillary phenomenon.
【００４７】なお、シャフト４を、実線で図示するよう
に軸心孔23に嵌め込んだ後、図２に示す如く、スラスト
体10を圧入して押え部材20を装着することで、上記間隔
Ｈ1，Ｈ2 が確保される。After the shaft 4 is fitted in the shaft center hole 23 as shown by the solid line, the thrust member 10 is press-fitted and the pressing member 20 is mounted as shown in FIG. 1 and H 2 are secured.
【００４８】また、上記間隔Ｈ1 ，Ｈ2 を有する連通路
Ｇは、上記油等が飛び出しにくいラビリンス形状（構
造）も兼ねており、一層の油漏れ防止効果が期待でき
る。Further, the communication passage G having the intervals H 1 and H 2 also has a labyrinth shape (structure) in which the oil or the like does not easily come out, and a further oil leakage prevention effect can be expected.
【００４９】[0049]
【発明の効果】本発明は上述の如く構成されているの
で、次に記載する効果を奏する。Since the present invention is configured as described above, it has the following effects.
【００５０】モータの軸受に用いられる動圧発生用油等
が、該軸受の外部へにじみ出したり、飛散したりする
と、回転するハブ９の遠心力によって、ハブ９の内部
（連通路Ｇ）を外径方向へ移動して油溜り31に収容・保
持される。従って、上記油等がモータ外部へ漏れ出すの
を確実に防止できる。When the dynamic pressure generating oil or the like used for the bearing of the motor oozes or scatters to the outside of the bearing, the centrifugal force of the rotating hub 9 causes the inside of the hub 9 (communication passage G) to flow. It moves in the outer diameter direction and is stored and held in the oil sump 31. Therefore, it is possible to reliably prevent the oil or the like from leaking out of the motor.
【図１】本発明の一実施例を示す断面図である。FIG. 1 is a sectional view showing an embodiment of the present invention.
【図２】要部拡大断面図である。FIG. 2 is an enlarged sectional view of a main part.
【図３】表面張力で丸くなった油を示す説明図である。FIG. 3 is an explanatory diagram showing oil rounded by surface tension.
【図４】凹周溝の拡大断面図である。FIG. 4 is an enlarged cross-sectional view of a concave circumferential groove.
【図５】組立手順の説明図である。FIG. 5 is an explanatory diagram of an assembly procedure.
【図６】従来例を示す断面図である。FIG. 6 is a cross-sectional view showing a conventional example.
９ ハブ 31 油溜り 9 hub 31 oil sump
Claims (1)
タに於て、ハブ９の内部に、飛散した油等を収容して保
持する油溜り31を凹設したことを特徴とするスピンドル
モータ。1. A spindle motor having a hydrodynamic bearing, characterized in that an oil sump 31 for accommodating and holding scattered oil is held in the hub 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34976792A JP3405750B2 (en) | 1992-12-02 | 1992-12-02 | Spindle motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34976792A JP3405750B2 (en) | 1992-12-02 | 1992-12-02 | Spindle motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06178488A true JPH06178488A (en) | 1994-06-24 |
| JP3405750B2 JP3405750B2 (en) | 2003-05-12 |
Family
ID=18405978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34976792A Expired - Fee Related JP3405750B2 (en) | 1992-12-02 | 1992-12-02 | Spindle motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3405750B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4437837A1 (en) * | 1994-10-22 | 1996-04-25 | Hoechst Ag | Recovering low density, water-immiscible solvent |
| JPH09210054A (en) * | 1996-02-07 | 1997-08-12 | Sankyo Seiki Mfg Co Ltd | Dynamic pressure bearing device |
| JPH09217734A (en) * | 1996-02-07 | 1997-08-19 | Sankyo Seiki Mfg Co Ltd | Dynamic pressure bearing device |
| JPH09222121A (en) * | 1996-02-16 | 1997-08-26 | Sankyo Seiki Mfg Co Ltd | Dynamic pressure bearing device |
| KR20020005925A (en) * | 2000-07-11 | 2002-01-18 | 이형도 | Oil leakage protection structure for spindle motor |
-
1992
- 1992-12-02 JP JP34976792A patent/JP3405750B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4437837A1 (en) * | 1994-10-22 | 1996-04-25 | Hoechst Ag | Recovering low density, water-immiscible solvent |
| JPH09210054A (en) * | 1996-02-07 | 1997-08-12 | Sankyo Seiki Mfg Co Ltd | Dynamic pressure bearing device |
| JPH09217734A (en) * | 1996-02-07 | 1997-08-19 | Sankyo Seiki Mfg Co Ltd | Dynamic pressure bearing device |
| JPH09222121A (en) * | 1996-02-16 | 1997-08-26 | Sankyo Seiki Mfg Co Ltd | Dynamic pressure bearing device |
| KR20020005925A (en) * | 2000-07-11 | 2002-01-18 | 이형도 | Oil leakage protection structure for spindle motor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3405750B2 (en) | 2003-05-12 |
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