JPH06245427A - Spindle motor - Google Patents
Spindle motorInfo
- Publication number
- JPH06245427A JPH06245427A JP5050065A JP5006593A JPH06245427A JP H06245427 A JPH06245427 A JP H06245427A JP 5050065 A JP5050065 A JP 5050065A JP 5006593 A JP5006593 A JP 5006593A JP H06245427 A JPH06245427 A JP H06245427A
- Authority
- JP
- Japan
- Prior art keywords
- lubricant
- substantially cylindrical
- sleeve
- shaft
- cylindrical 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
- 239000000314 lubricant Substances 0.000 claims abstract description 85
- 230000002093 peripheral effect Effects 0.000 claims description 56
- 230000002265 prevention Effects 0.000 claims description 24
- 239000005871 repellent Substances 0.000 claims description 8
- 230000002940 repellent Effects 0.000 claims description 6
- 239000003921 oil Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000717 retained effect Effects 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Sliding-Contact Bearings (AREA)
- Motor Or Generator Frames (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、軸体に対しスリーブ体
が、潤滑剤を介して自在に相対回転し得るように外嵌さ
れた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 in which a sleeve body is externally fitted to a shaft body so as to freely rotate relative to the shaft body through a lubricant.
【0002】[0002]
【従来の技術及び解決しようとする課題】パーソナルコ
ンピュータ等の機器の一層の小形化、高容量化により、
それらに組み込まれる記録媒体(例えばハードディス
ク)駆動用のスピンドルモータについても、一層の小形
化、高精度化が要請されている。そしてそれに伴い、ス
ピンドルモータの軸受についても一層の小形化、高精度
化が要求されている。2. Description of the Related Art Due to further miniaturization and higher capacity of devices such as personal computers,
Further miniaturization and higher precision are also required for spindle motors for driving recording media (for example, hard disks) incorporated therein. Along with this, further miniaturization and higher precision are required for the bearings of the spindle motor.
【0003】従来、スピンドルモータに用いる軸受とし
ては、玉軸受が多く採用されている。ところが、スピン
ドルモータの小形化、特に小外径化が進行すると、それ
に見合う小外径の玉軸受を用いたのでは、モータ組立時
に内外輪の変形が生じ易いこと等により、十分な回転精
度を実現することが実際上困難なものとなりがちであ
る。また騒音や振動の問題も起こり易い。Conventionally, ball bearings have been widely used as bearings used in spindle motors. However, as miniaturization of spindle motors, especially smaller outer diameters progresses, ball bearings with smaller outer diameters that match the smaller spindle motors may be used, which may cause deformation of the inner and outer rings during motor assembly. It tends to be practically difficult to achieve. Also, noise and vibration problems are likely to occur.
【0004】記録媒体駆動用のスピンドルモータの場
合、小外径化に伴い高速回転が要求されるので、これら
の問題が一層助長される。さらに、外径の大小にかかわ
らず、玉軸受の精度には限界があり、要求仕様を満足し
ない場合が考えられる。In the case of a spindle motor for driving a recording medium, high speed rotation is required as the outer diameter becomes smaller, so these problems are further aggravated. Furthermore, regardless of the size of the outer diameter, there is a limit to the accuracy of the ball bearing, and it may be possible that the required specifications are not satisfied.
【0005】そのため、主として小形のスピンドルモー
タとして、ロータハブ部の基部の内周側に回転スリーブ
部を有し、その回転スリーブ部が固定軸体に外嵌されて
回転自在に支持されることにより動圧ラジアル軸受が構
成されているスピンドルモータが提案されている。Therefore, as a small-sized spindle motor, a rotary sleeve portion is provided on the inner peripheral side of the base portion of the rotor hub portion, and the rotary sleeve portion is externally fitted to the fixed shaft body and rotatably supported to move. A spindle motor having a pressure radial bearing has been proposed.
【0006】ところが、回転駆動される記録媒体面上に
磁気ヘッド等をミクロン或はサブミクロンオーダで浮上
させて読み/書きを行うためのスピンドルモータの場合
などにおいては、軸受の潤滑剤が飛散して記録媒体面等
を汚損することが回避されなければならないので、回転
スリーブ部と固定軸体との間の動圧ラジアル軸受部に十
分に潤滑剤を行き渡らせると共に、回転スリーブ部と固
定軸体との間からの潤滑剤の漏出は防止される必要があ
る。また、固定軸体のうち回転スリーブ部から突出した
部分を、例えばブラケット等に圧入や接着により固定す
る場合に、そのような突出部の外周面に潤滑剤が付着す
ると、それを除去しなければ固定を適切に行い得ないた
め、そのような潤滑剤の付着が防止されることが望まれ
る。However, in the case of a spindle motor for reading / writing by flying a magnetic head or the like on the surface of a recording medium that is rotationally driven in the order of microns or submicrons, the lubricant of the bearing is scattered. Therefore, it is necessary to prevent the recording medium surface and the like from being soiled, so that the dynamic pressure radial bearing portion between the rotating sleeve portion and the fixed shaft body can be sufficiently spread with the lubricant, and the rotating sleeve portion and the fixed shaft body can be covered. Leakage of lubricant from between and should be prevented. Further, when a portion of the fixed shaft protruding from the rotary sleeve is fixed to a bracket or the like by press fitting or adhesion, if lubricant adheres to the outer peripheral surface of such a protruding portion, it must be removed. It is desirable to prevent such lubricants from adhering, as they cannot be properly fixed.
【0007】本発明は、従来技術に存した上記のような
問題点に鑑み行われたものであって、その目的とすると
ころは、スリーブ体と軸体との間の動圧ラジアル軸受部
に十分に潤滑剤を行き渡らせることを容易に行い得ると
共に、スリーブ体と軸体との間からの潤滑剤の漏出、及
び軸体のうちスリーブ体から突出した部分に対する潤滑
剤の付着が効果的に防止され得る、動圧ラジアル軸受利
用のスピンドルモータを提供することにある。The present invention has been made in view of the above problems existing in the prior art, and an object of the present invention is to provide a dynamic pressure radial bearing portion between a sleeve body and a shaft body. The lubricant can be easily spread sufficiently, and the leakage of the lubricant from between the sleeve body and the shaft body and the adhesion of the lubricant to the portion of the shaft body protruding from the sleeve body are effective. (EN) Provided is a spindle motor using a dynamic pressure radial bearing which can be prevented.
【0008】[0008]
【課題を解決するための手段】上記目的を達成するため
に、本発明のスピンドルモータは、略円筒面形状外周部
を有してなる軸体と、その略円筒面形状外周部に外嵌さ
れた略円筒面形状内周部を有してなるスリーブ体とを備
えてなり、軸体に対しスリーブ体が、潤滑剤を介して自
在に相対回転し得るスピンドルモータであって、軸体の
一端側に、スリーブ体の略円筒面形状内周部から突出し
た突出部を有し、軸体の略円筒面形状外周部のうちスリ
ーブ体の略円筒面形状内周部に相対する部分に、内表面
に撥油処理が施された環状の潤滑剤流出防止溝を有し、
略円筒面形状外周部と略円筒面形状内周部との間隙部の
うち、潤滑剤流出防止溝からみて突出部とは逆の側にお
ける少なくとも2個所に、軸体に対するスリーブ体の相
対回転により、介装された潤滑剤に荷重支持圧を発生さ
せるラジアル動圧軸受部を有し、ラジアル動圧軸受部同
士の間において、略円筒面形状外周部及び略円筒面形状
内周部に、それぞれ軸体側中間溝部及びスリーブ側中間
溝部を向い合った状態で有するものとしている。In order to achieve the above object, a spindle motor according to the present invention has a shaft body having a substantially cylindrical outer peripheral portion and an outer peripheral portion fitted to the outer peripheral portion of the substantially cylindrical outer surface. And a sleeve body having a substantially cylindrical inner surface, wherein the sleeve body can freely rotate relative to the shaft body through a lubricant, and one end of the shaft body is provided. On the side, there is a protruding portion that protrudes from the substantially cylindrical surface-shaped inner peripheral portion of the sleeve body. Has an annular lubricant outflow prevention groove with oil repellent treatment on the surface,
In the gap between the outer peripheral portion of the substantially cylindrical surface shape and the inner peripheral portion of the substantially cylindrical surface shape, at least two positions on the opposite side to the protruding portion when viewed from the lubricant outflow prevention groove are formed by relative rotation of the sleeve body with respect to the shaft body. , Having a radial dynamic pressure bearing portion for generating a load bearing pressure on the interposed lubricant, between the radial dynamic pressure bearing portions, the substantially cylindrical surface-shaped outer peripheral portion and the substantially cylindrical surface-shaped inner peripheral portion, respectively. The shaft-side intermediate groove portion and the sleeve-side intermediate groove portion are provided so as to face each other.
【0009】[0009]
【作用】スリーブ体の略円筒面形状内周部内への軸体の
挿入を、その軸体の突出部から行い始め、潤滑剤流出防
止溝まで挿入した際に、スリーブ体の略円筒面形状内周
部の入り口に潤滑剤を配し、更に軸体の挿入を進める
と、略円筒面形状外周部と略円筒面形状内周部の間に潤
滑剤が徐々に引き込まれる。When the shaft body is inserted into the inner peripheral portion of the substantially cylindrical surface of the sleeve body from the protruding portion of the shaft body and is inserted into the lubricant outflow prevention groove, the inner surface of the sleeve body is substantially cylindrical. When a lubricant is arranged at the inlet of the peripheral portion and the shaft body is further inserted, the lubricant is gradually drawn between the outer peripheral portion of the substantially cylindrical surface shape and the inner peripheral portion of the substantially cylindrical surface shape.
【0010】軸体の挿入を進めると、軸体側中間溝部
が、略円筒面形状内周部の入り口を通過する際にそこに
配された前記潤滑剤を多量に取り込みつつ、スリーブ体
の略円筒面形状内周部内に挿入される。それによって、
略円筒面形状外周部と略円筒面形状内周部の間隙のう
ち、軸体側中間溝部及びスリーブ側中間溝部並びにそれ
らを挟むラジアル動圧軸受部に、潤滑剤が十分に行き渡
る。As the insertion of the shaft advances, the intermediate groove portion on the shaft side takes in a large amount of the lubricant disposed therein when passing through the entrance of the inner peripheral portion of the substantially cylindrical surface shape, and at the same time the substantially cylindrical shape of the sleeve body. It is inserted in the inner peripheral portion of the surface shape. Thereby,
In the gap between the outer peripheral portion of the substantially cylindrical surface shape and the inner peripheral portion of the substantially cylindrical surface shape, the lubricant is sufficiently distributed to the shaft-side intermediate groove portion, the sleeve-side intermediate groove portion, and the radial dynamic pressure bearing portion sandwiching them.
【0011】但し、潤滑剤流出防止溝は、潤滑剤がスリ
ーブ体の略円筒面形状内周部の入り口に配される前に略
円筒面形状内周部内に挿入されており、而も、その潤滑
剤流出防止溝において径方向間隙が拡大し、内表面には
撥油処理が施されているので、軸体挿入の際に潤滑剤流
出防止溝に潤滑剤が流出することは表面張力により防止
される。従って潤滑剤流出防止溝よりも更に突出部側の
軸体の外周面に潤滑剤が付着することは防がれる。However, the lubricant outflow prevention groove is inserted in the substantially cylindrical inner peripheral portion before the lubricant is disposed at the inlet of the substantially cylindrical inner peripheral portion of the sleeve body. The radial gap is expanded in the lubricant outflow prevention groove and the oil repellent treatment is applied to the inner surface, so the surface tension prevents the lubricant from flowing into the lubricant outflow prevention groove when the shaft is inserted. To be done. Therefore, it is possible to prevent the lubricant from adhering to the outer peripheral surface of the shaft body further on the protrusion side than the lubricant outflow prevention groove.
【0012】また軸体挿入完了後においても、略円筒面
形状外周部と略円筒面形状内周部の間に介在する潤滑剤
が突出部側へ移動しようとした場合、同様に表面張力に
より、潤滑剤流出防止溝を越えて突出部側へ移動するこ
とが阻止される。Even after the shaft is completely inserted, when the lubricant intervening between the outer peripheral portion of the substantially cylindrical surface shape and the inner peripheral portion of the substantially cylindrical surface shape tries to move to the protruding portion side, similarly due to the surface tension, It is prevented from moving beyond the lubricant outflow prevention groove to the protruding portion side.
【0013】またスリーブ側中間溝部と軸体側中間溝部
が相対する部分においては、径方向間隙が大きいので、
モータ回転時における潤滑剤の抵抗がラジアル動圧軸受
部よりも低くなる。Since the radial gap is large at the portion where the sleeve-side intermediate groove portion and the shaft-side intermediate groove portion face each other,
The resistance of the lubricant when the motor rotates becomes lower than that of the radial dynamic pressure bearing portion.
【0014】[0014]
【実施例】本発明の実施例を、図面を参照しつつ説明す
る。図1は、本発明の1実施例としての軸固定型の記録
媒体駆動用のスピンドルモータの断面図、図2乃至図4
はその要部拡大図である。対象となる記録媒体として
は、ハードディスクや、それ以外の種々の記録媒体を挙
げることができる。Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a spindle motor for driving a recording medium of a fixed shaft type according to an embodiment of the present invention, and FIGS.
Is an enlarged view of the relevant part. The target recording medium may be a hard disk or various other recording media.
【0015】ブラケット10は、その上方開口の環状凹
部10aの内周部に上方突出部10bを有し、環状凹部
10aの外周側にフランジ部10cを有する。上方突出
部10bの中央部には、上下方向の貫通孔10dが設け
られている。なお、ブラケット10は、例えばハードデ
ィスク駆動装置の基盤内に一体的に形成することも勿論
可能である。The bracket 10 has an upper projecting portion 10b on the inner peripheral portion of an annular recess 10a of the upper opening, and a flange portion 10c on the outer peripheral side of the annular recess 10a. A vertical through hole 10d is provided in the central portion of the upper protruding portion 10b. The bracket 10 can of course be integrally formed in the base of the hard disk drive, for example.
【0016】ブラケット10の貫通孔10d内に、円柱
状をなす固定軸体12(軸体)の下端部が嵌合固定さ
れ、もってその固定軸体12がブラケット10の中央部
に立設されている。上方突出部10bの外周部には上向
きの環状突部10b1が設けられ、その環状突部10b
1の外周部に、ステータコア14の内周下部が外嵌固定
されている。ステータコア14には、ステータコイル1
6が捲回されている。ステータコイル14の引出し部1
4aは、ブラケット10の環状凹部10aを貫通する引
き出し孔10eを通じて下方に引き出されている。A lower end portion of a cylindrical fixed shaft body 12 (shaft body) is fitted and fixed in the through hole 10d of the bracket 10, so that the fixed shaft body 12 is erected at the central portion of the bracket 10. There is. An upward annular protrusion 10b1 is provided on the outer peripheral portion of the upward protrusion 10b.
The lower inner peripheral portion of the stator core 14 is externally fitted and fixed to the outer peripheral portion of 1. In the stator core 14, the stator coil 1
6 is wound. Pull-out portion 1 of the stator coil 14
4a is pulled out downward through a pull-out hole 10e that penetrates the annular recess 10a of the bracket 10.
【0017】環状のスラスト板18は、固定軸体12の
上部に外嵌固定されている。スラスト板18の上下面
は、固定軸体12の略円筒面形状外周部に対し垂直状を
なす。なお、スラスト板は、固定軸体に一体的に形成さ
れていてもよい。The annular thrust plate 18 is externally fitted and fixed to the upper portion of the fixed shaft body 12. The upper and lower surfaces of the thrust plate 18 are perpendicular to the outer peripheral portion of the fixed shaft body 12 having a substantially cylindrical surface shape. The thrust plate may be formed integrally with the fixed shaft body.
【0018】スリーブ部材20(スリーブ体)は、上端
部の外径が拡開された略円筒形状をなし、内周部は、全
体として小径の略円筒面形状をなすラジアル滑部20a
(略円筒面形状内周部)と、その上方において拡径され
た中内径部20bと、中内径部20bの上方において更
に拡径された大内径部20cからなる。The sleeve member 20 (sleeve body) has a substantially cylindrical shape in which the outer diameter of the upper end portion is widened, and the inner peripheral portion has a radial sliding portion 20a having a generally small cylindrical surface shape.
(Inner peripheral portion of substantially cylindrical surface), a medium inner diameter portion 20b having a diameter enlarged above it, and a large inner diameter portion 20c having a diameter further enlarged above the middle inner diameter portion 20b.
【0019】スリーブ部材20は、固定軸体12に外嵌
され、スリーブ部材20の大内径部20cに、内周部が
固定軸体12との間に僅かな径方向間隙を隔てる状態で
環状のスラスト押え板22が内嵌され、大内径部20c
の上端部が内側へかしめられることによりスラスト押え
板22が固定されている。そして、スラスト押え板22
とスリーブ部材20によって中内径部20bの内側に形
成された径方向内方開口の環状凹部24内に、スラスト
板18が嵌合している。固定軸体12の下部は、スリー
ブ部材20の下方に突出し、その大部分がブラケット1
0の貫通孔10dに嵌合している。以下、固定軸体12
のうちこの突出した部分を突出部12aという。また、
固定軸体12の略円筒面形状外周部のうちラジアル滑部
20aに相対する部分を、ラジアル受部12bという。The sleeve member 20 is externally fitted to the fixed shaft body 12, and has an annular shape with a large inner diameter portion 20c of the sleeve member 20 such that the inner peripheral portion thereof forms a slight radial gap with the fixed shaft body 12. The thrust retainer plate 22 is fitted in the large inner diameter portion 20c.
The thrust pressing plate 22 is fixed by crimping the upper end of the thrust pressing plate 22 inward. Then, the thrust pressing plate 22
The thrust plate 18 is fitted in the annular recess 24 formed in the inner diameter portion 20b by the sleeve member 20 and having an opening in the radial direction. The lower part of the fixed shaft body 12 projects below the sleeve member 20, and most of it is in the bracket 1.
It is fitted in the 0 through hole 10d. Hereinafter, the fixed shaft body 12
Of these, the protruding portion is referred to as a protruding portion 12a. Also,
A portion of the substantially cylindrical outer peripheral portion of the fixed shaft body 12 facing the radial sliding portion 20a is referred to as a radial receiving portion 12b.
【0020】ロータハブ28は、略カップ形状をなす。
ロータハブ28の周壁部28aの上端部内方に、中央部
が円形に開口する基部28bが位置し、周壁部28aの
下端外方に外方張出部28cが位置する。このロータハ
ブ28は、基部28bにおいてスリーブ部材20の上端
部に外嵌固定されることにより、スリーブ部材20と同
軸状をなしている。そして接着剤29によって、基部2
8bの上端内周部と大内径部20cの上端部とスラスト
押え板22の外周状端部とが固定され、それらの間が密
閉されている。なお、ロータハブ28とスリーブ部材2
0が一体に形成されたものであっても差し支えない。The rotor hub 28 has a substantially cup shape.
A base portion 28b having a circular opening in the center is located inside the upper end of the peripheral wall portion 28a of the rotor hub 28, and an outward projecting portion 28c is located outside the lower end of the peripheral wall portion 28a. The rotor hub 28 is coaxial with the sleeve member 20 by being externally fitted and fixed to the upper end portion of the sleeve member 20 at the base portion 28b. Then, with the adhesive 29, the base 2
The inner peripheral portion of the upper end of 8b, the upper end portion of the large inner diameter portion 20c, and the outer peripheral end portion of the thrust pressing plate 22 are fixed, and the space between them is sealed. The rotor hub 28 and the sleeve member 2
It does not matter even if 0 is integrally formed.
【0021】周壁部28aの内周部には、円筒状のロー
タヨーク30が内嵌固定され、その内周側に保持された
ロータマグネット32は、ステータコア14に対し径方
向空隙を隔てて相対している。基部28bには、周壁部
28aに外嵌されたハードディスク等の記録媒体(図示
を略す。)を外方張出部28cとの間に挟圧保持するた
めのクランパ(図示を略す。)を螺子止めするための螺
子孔34が形成されている。A cylindrical rotor yoke 30 is internally fitted and fixed to the inner peripheral portion of the peripheral wall portion 28a, and the rotor magnet 32 held on the inner peripheral side thereof faces the stator core 14 with a radial gap therebetween. There is. On the base portion 28b, a clamper (not shown) for holding a recording medium (not shown) such as a hard disk fitted on the peripheral wall portion 28a between the outer protrusion portion 28c and a recording medium is screwed. A screw hole 34 for stopping is formed.
【0022】スリーブ部材20のラジアル滑部20aに
おける上部及び下部の環状部分に、上下ヘリングボーン
溝(図示を略す。)が設けられ、その上下ヘリングボー
ン溝と、固定軸体12のラジアル受部12bとの間隙
部、すなわち上下ラジアル動圧軸受部36・38は、ス
リーブ部材20の順方向回転により、そこに介装された
液状の潤滑剤39にラジアル荷重支持圧を発生させる。
特に、上下ヘリングボーン溝により、その荷重支持圧が
高められる。なお、このようなヘリングボーン溝は、固
定軸体12のラジアル受部12bに設けてもよい。また
ヘリングボーン溝以外の溝を採用することも可能であ
る。The upper and lower annular portions of the radial sliding portion 20a of the sleeve member 20 are provided with upper and lower herringbone grooves (not shown), and the upper and lower herringbone grooves and the radial receiving portion 12b of the fixed shaft body 12. The gaps between the upper and lower radial dynamic pressure bearing portions 36, 38 generate a radial load supporting pressure in the liquid lubricant 39 interposed therein by the forward rotation of the sleeve member 20.
In particular, the upper and lower herringbone grooves increase the load bearing pressure. Note that such a herringbone groove may be provided in the radial receiving portion 12b of the fixed shaft body 12. It is also possible to adopt a groove other than the herringbone groove.
【0023】上下ラジアル動圧軸受部36・38同士の
間において、ラジアル滑部20a及びラジアル受部12
bに、それぞれスリーブ側中間溝部20d及び軸体側中
間溝部12cを向い合った状態で有する。図2は、この
部分の拡大図である。なお、本実施例ではスリーブ側中
間溝部20dと軸体側中間溝部12cの軸線方向長さが
等しく、而も軸線方向位置も一致しているが、これらは
必須の条件ではない。Between the upper and lower radial dynamic pressure bearing portions 36 and 38, the radial sliding portion 20a and the radial receiving portion 12 are provided.
b, the sleeve-side intermediate groove portion 20d and the shaft-body-side intermediate groove portion 12c are faced to each other. FIG. 2 is an enlarged view of this portion. In the present embodiment, the sleeve-side intermediate groove portion 20d and the shaft-body-side intermediate groove portion 12c have the same axial length and the same axial position, but these are not essential conditions.
【0024】固定軸体12のラジアル受部12bにおけ
る下ラジアル動圧軸受部38の下方に、内表面に撥油処
理が施された環状の軸体側潤滑剤流出防止溝12dを有
する。またスリーブ部材20のラジアル滑部20aに、
軸体側潤滑剤流出防止溝12dに向い合ったスリーブ側
潤滑剤流出防止溝20eを有する。図3は、この部分の
拡大図である。スリーブ側潤滑剤流出防止溝20eは、
中央溝部20e1と、その中央溝部20e1の軸線方向
両側に位置し、中央溝部20e1よりも浅い上下側溝部
20e2・20e3からなり、内表面に撥油処理が施さ
れている。中央溝部20e1は、軸体側潤滑剤流出防止
溝12dと、軸線方向長さが等しく、而も軸線方向位置
も一致している。Below the lower radial dynamic pressure bearing portion 38 of the radial receiving portion 12b of the fixed shaft body 12, there is provided an annular shaft side lubricant outflow prevention groove 12d having an oil repellent treatment on its inner surface. Further, in the radial sliding portion 20a of the sleeve member 20,
It has a sleeve side lubricant outflow prevention groove 20e facing the shaft side lubricant outflow prevention groove 12d. FIG. 3 is an enlarged view of this portion. The sleeve side lubricant outflow prevention groove 20e is
The central groove portion 20e1 and upper and lower side groove portions 20e2 and 20e3, which are located on both sides in the axial direction of the central groove portion 20e1 and are shallower than the central groove portion 20e1, have an oil repellent treatment on the inner surface. The central groove portion 20e1 has the same axial length as the axial body side lubricant outflow prevention groove 12d, and also coincides with the axial position.
【0025】スラスト板18の上下環状面(アキシャル
受部)と環状凹部24の上下環状面(アキシャル滑部)
とにより、それぞれアキシャル動圧軸受部A1・A2が
構成されている。スラスト板18の上下環状面と環状凹
部24の上下環状面はそれぞれ平行状に相対し、それら
の間には、液状の潤滑剤39が介在して僅かな軸線方向
ギャップを隔てている。スラスト板18の上下環状面に
おける全周に亙って、ヘリングボーン状溝(図示を略
す。)が設けられている。このヘリングボーン状溝は、
スリーブ部材20及びスラスト押え板22の順方向回転
により、環状凹部24の上下環状面との間に介在する潤
滑剤39に高圧を発生させる。なお、このようなヘリン
グボーン状溝は、環状凹部24の上下環状面に設けても
よい。またヘリングボーン状溝以外の溝を採用すること
も可能である。Upper and lower annular surfaces of the thrust plate 18 (axial receiving portions) and upper and lower annular surfaces of the annular recess 24 (axial sliding portions).
And constitute axial dynamic pressure bearing portions A1 and A2, respectively. The upper and lower annular surfaces of the thrust plate 18 and the upper and lower annular surfaces of the annular recessed portion 24 face each other in parallel, and a liquid lubricant 39 is interposed between them to separate a slight axial gap. Herringbone-shaped grooves (not shown) are provided over the entire circumference of the upper and lower annular surfaces of the thrust plate 18. This herringbone groove is
By the forward rotation of the sleeve member 20 and the thrust pressing plate 22, a high pressure is generated in the lubricant 39 interposed between the sleeve member 20 and the thrust pressing plate 22 and the upper and lower annular surfaces of the annular recess 24. It should be noted that such herringbone-shaped grooves may be provided on the upper and lower annular surfaces of the annular recess 24. It is also possible to adopt a groove other than the herringbone-shaped groove.
【0026】スラスト押え板22の内周部のうち軸線方
向中間位置に、内表面に撥油処理が施された押え板側環
状溝22aを有し、固定軸体12の外周部に、その押え
板側環状溝22aに向い合った軸体側環状溝12eを有
する。軸体側環状溝12eの内表面も撥油処理が施され
ている。図4は、この部分の拡大図である。押え板側環
状溝22aは、中央溝部22a1と、その中央溝部22
a1の軸線方向両側に位置し、中央溝部22a1よりも
浅い上下側溝部22a2・22a3からなり、中央溝部
22a1は、軸体側環状溝12eと、軸線方向長さが等
しく、而も軸線方向位置も一致している。An inner peripheral surface of the thrust pressing plate 22 is provided with an annular groove 22a on the pressing plate side, the inner surface of which is oil-repellent treated, at an intermediate position in the axial direction. It has a shaft-side annular groove 12e facing the plate-side annular groove 22a. The inner surface of the shaft-side annular groove 12e is also oil-repellent treated. FIG. 4 is an enlarged view of this portion. The holding plate side annular groove 22a includes a central groove portion 22a1 and the central groove portion 22a.
It is located on both sides of a1 in the axial direction and is composed of upper and lower side groove portions 22a2 and 22a3 which are shallower than the central groove portion 22a1. I am doing it.
【0027】このようにして、固定軸体12及びステー
タコア14等に対し、スリーブ部材20及びロータハブ
28等が、潤滑剤39を介して自在に回転し得るよう構
成されている。上下ラジアル動圧軸受部36・38によ
って、スリーブ部材20の回転中における固定軸体12
に対する径方向変位を十分に小さく抑えることができ、
アキシャル動圧軸受部A1・A2によって、スリーブ部
材20の回転中における固定軸体12に対する軸線方向
変位を十分に小さく抑えることができる。In this manner, the sleeve member 20, the rotor hub 28, etc. are configured to be freely rotatable with respect to the fixed shaft body 12, the stator core 14, etc. via the lubricant 39. The upper and lower radial dynamic pressure bearing portions 36 and 38 allow the fixed shaft body 12 to rotate while the sleeve member 20 is rotating.
Radial displacement with respect to
By the axial dynamic pressure bearings A1 and A2, the axial displacement of the sleeve member 20 with respect to the fixed shaft body 12 during rotation can be sufficiently suppressed.
【0028】固定軸体12に対しスリーブ部材20が相
対回転すると、上下ラジアル動圧軸受部36・38は、
そこに介装された潤滑剤39に主としてラジアル方向の
荷重支持圧を発生させ、アキシャル動圧軸受部A1・A
2は、そこに介装された潤滑剤39に主としてアキシャ
ル方向の荷重支持圧を発生させる。回転停止状態におい
て下ラジアル動圧軸受部38に隣接するスリーブ側潤滑
剤流出防止溝20eの上側溝部20e2に潤滑剤39が
漏出していた場合、その潤滑剤39を下ラジアル動圧軸
受部38内に取り込む。また、同じく押え板側環状溝2
2aの下側溝部22a3に潤滑剤39が漏出していた場
合、その潤滑剤39をアキシャル動圧軸受部A1に取り
込む。When the sleeve member 20 rotates relative to the fixed shaft body 12, the upper and lower radial dynamic pressure bearing portions 36, 38 are
The load bearing pressure mainly in the radial direction is generated in the lubricant 39 interposed therein, and the axial dynamic pressure bearing portions A1 and A
2 mainly generates a load bearing pressure in the axial direction on the lubricant 39 interposed therein. When the lubricant 39 leaks to the upper groove portion 20e2 of the sleeve side lubricant outflow prevention groove 20e adjacent to the lower radial dynamic pressure bearing portion 38 in the rotation stopped state, the lubricant 39 is leaked to the lower radial dynamic pressure bearing portion 38. Take in. Similarly, the holding plate side annular groove 2
When the lubricant 39 leaks to the lower groove portion 22a3 of the 2a, the lubricant 39 is taken into the axial dynamic pressure bearing portion A1.
【0029】スリーブ側中間溝部20dと軸体側中間溝
部12cが向かい合った部分は径方向間隙が大きくなる
ので、介装された潤滑剤39のモータ回転時における抵
抗がラジアル動圧軸受部よりも低い。そのため全体とし
ての回転抵抗が低減される。Since the radial gap is large in the portion where the sleeve-side intermediate groove portion 20d and the shaft-side intermediate groove portion 12c face each other, the resistance of the interposed lubricant 39 at the time of motor rotation is lower than that of the radial dynamic pressure bearing portion. Therefore, the rotation resistance as a whole is reduced.
【0030】回転が停止し、固定軸体12とスリーブ部
材20との間に相対的な傾斜が生じた場合、下ラジアル
動圧軸受部38において保持しきれない潤滑剤39は上
側溝部20e2に漏出し、アキシャル動圧軸受部A1に
おいて保持しきれない潤滑剤39は下側溝部22a3に
漏出する。When the rotation is stopped and a relative inclination is generated between the fixed shaft body 12 and the sleeve member 20, the lubricant 39 which cannot be retained in the lower radial dynamic pressure bearing portion 38 is retained in the upper groove portion 20e2. The lubricant 39 that leaks and cannot be held in the axial dynamic pressure bearing portion A1 leaks to the lower groove portion 22a3.
【0031】しかしながら、その潤滑剤39は、それぞ
れ上側溝部20e2及び下側溝部22a3に毛管現象に
より保持される。潤滑剤39が更に軸体側潤滑剤流出防
止溝12dや中央溝部20e1、並びに軸体側環状溝1
2eや中央溝部22a1へと流出しようとしても、その
ような流出は、潤滑剤39の表面張力により防止され
る。また、そのため、潤滑剤39が漏出してモータ外部
の空間を汚染することが効果的に防止される。なお、軸
体側潤滑剤流出防止溝12d及び軸体側環状溝12eへ
の潤滑剤39の流出がそれぞれ表面張力により防止され
るという作用は、スリーブ側潤滑剤流出防止溝20e及
び押え板側環状溝22aがなくとも実現され得る。However, the lubricant 39 is retained in the upper groove portion 20e2 and the lower groove portion 22a3 by capillarity. The lubricant 39 is further applied to the shaft side lubricant outflow prevention groove 12d, the central groove portion 20e1, and the shaft side annular groove 1.
Even if an attempt is made to flow out to 2e or the central groove portion 22a1, such outflow is prevented by the surface tension of the lubricant 39. Further, therefore, the lubricant 39 is effectively prevented from leaking and contaminating the space outside the motor. The action of preventing the lubricant 39 from flowing into the shaft-side lubricant outflow prevention groove 12d and the shaft-side annular groove 12e by the surface tension has the effect of preventing the sleeve-side lubricant outflow prevention groove 20e and the holding plate side annular groove 22a. Can be realized without.
【0032】以上に説明したスピンドルモータを組み立
てる場合、図5に示されるように、スリーブ部材20の
ラジアル滑部20a内への固定軸体12の挿入を、その
突出部12aから行い始め、図6に示されるように、軸
体側潤滑剤流出防止溝12dまで挿入した際に、スリー
ブ部材20のラジアル滑部20aの上側入り口において
固定軸体12の周囲に潤滑剤39を配し、更に固定軸体
12の挿入を進めると、ラジアル受部12bとラジアル
滑部20aの間に潤滑剤39が徐々に引き込まれる。When assembling the spindle motor described above, as shown in FIG. 5, the insertion of the fixed shaft body 12 into the radial sliding portion 20a of the sleeve member 20 is started from the projecting portion 12a thereof, and then, as shown in FIG. As shown in FIG. 4, when the lubricant is prevented from entering the shaft side lubricant outflow prevention groove 12d, the lubricant 39 is arranged around the fixed shaft body 12 at the upper entrance of the radial sliding portion 20a of the sleeve member 20, and the fixed shaft body is further fixed. When the insertion of 12 is advanced, the lubricant 39 is gradually drawn between the radial receiving portion 12b and the radial sliding portion 20a.
【0033】固定軸体12の挿入を進めると、図7に示
されるように、軸体側中間溝部12cが、ラジアル滑部
20aの入り口を通過する際にそこに配された前記潤滑
剤39を多量に取り込みつつ、スリーブ部材20のラジ
アル滑部20a内に挿入される。それによって、図8に
示されるようにラジアル受部12bとラジアル滑部20
aの間隙のうち、軸体側中間溝部12c及びスリーブ側
中間溝部20d並びにそれらを挟む上下ラジアル動圧軸
受部36・38に、潤滑剤39が十分に行き渡る。As the insertion of the fixed shaft body 12 progresses, as shown in FIG. 7, when the shaft body side intermediate groove portion 12c passes through the entrance of the radial sliding portion 20a, a large amount of the lubricant 39 disposed therein is introduced. It is inserted into the radial sliding portion 20a of the sleeve member 20 while being taken in. Thereby, as shown in FIG. 8, the radial receiving portion 12b and the radial sliding portion 20 are provided.
The lubricant 39 is sufficiently distributed in the shaft-side intermediate groove portion 12c, the sleeve-side intermediate groove portion 20d, and the upper and lower radial dynamic pressure bearing portions 36 and 38 that sandwich them in the gap a.
【0034】但し、軸体側潤滑剤流出防止溝12dは、
潤滑剤39がスリーブ部材20のラジアル滑部20aの
入り口に配される前にラジアル滑部20a内に挿入され
ており、而もその軸体側潤滑剤流出防止溝12dにおい
て径方向間隙が拡大し、また内表面には撥油処理が施さ
れているので、固定軸体12挿入の際に軸体側潤滑剤流
出防止溝12dに潤滑剤39が流出することは表面張力
により防止される。従ってそれよりも更に突出部12a
側の固定軸体12の外周面に潤滑剤39が付着すること
も防がれる。However, the shaft side lubricant outflow preventing groove 12d is
The lubricant 39 is inserted into the radial sliding portion 20a before being arranged at the entrance of the radial sliding portion 20a of the sleeve member 20, and the radial gap in the shaft side lubricant outflow prevention groove 12d is enlarged. Further, since the inner surface is subjected to the oil repellent treatment, the surface tension prevents the lubricant 39 from flowing into the shaft side lubricant outflow preventing groove 12d when the fixed shaft 12 is inserted. Therefore, the protrusion 12a is further than that.
It is also possible to prevent the lubricant 39 from adhering to the outer peripheral surface of the fixed shaft body 12 on the side.
【0035】なお、軸体側中間溝部12cの軸線方向寸
法は、上下ラジアル動圧軸受部36・38の有効領域に
影響を与えない範囲で大きく設定することが望ましい。
これにより、固定軸体12の挿入の際にラジアル受部1
2bとラジアル滑部20aの間隙に潤滑剤39が取り込
まれる速度が上がり、生産性の向上が図られるからであ
る。軸体側中間溝部12cの軸線方向寸法を上ラジアル
動圧軸受部36よりも長くすると、より好ましい。固定
軸体12を挿入する際に、軸体側中間溝部12cの上端
がラジアル滑部20aの上側入り口の上方に位置し、軸
体側中間溝部12cの下端がスリーブ側中間溝部20d
の上端よりも下方に位置する状態が実現し、ラジアル受
部12bとラジアル滑部20aの間隙への潤滑剤39の
取り込み速度が一層上がるからである。以上の各実施例
についての記述における上下位置関係は、単に図に基づ
いた説明の便宜のためのものであって、実際の使用状態
等を限定するものではない。The axial dimension of the shaft-side intermediate groove portion 12c is preferably set large within a range that does not affect the effective area of the upper and lower radial dynamic pressure bearing portions 36 and 38.
Thereby, when the fixed shaft body 12 is inserted, the radial receiving portion 1
This is because the speed at which the lubricant 39 is taken into the gap between the 2b and the radial sliding portion 20a is increased, and the productivity is improved. It is more preferable that the axial dimension of the shaft-side intermediate groove portion 12c is longer than that of the upper radial dynamic pressure bearing portion 36. When inserting the fixed shaft body 12, the upper end of the shaft body side intermediate groove portion 12c is located above the upper entrance of the radial sliding portion 20a, and the lower end of the shaft body side intermediate groove portion 12c is the sleeve side intermediate groove portion 20d.
This is because the state of being located below the upper end of is realized, and the speed at which the lubricant 39 is taken into the gap between the radial receiving portion 12b and the radial sliding portion 20a is further increased. The vertical positional relationship in the description of each of the above embodiments is merely for convenience of description based on the drawings, and does not limit the actual usage state or the like.
【0036】[0036]
【発明の効果】本発明のスピンドルモータでは、スリー
ブ体の略円筒面形状内周部内への軸体の挿入をその突出
部から行い始め、潤滑剤流出防止溝まで挿入した際に、
スリーブ体の略円筒面形状内周部の入り口に潤滑剤を配
し、更に軸体の挿入を進めることにより、スリーブ体と
軸体との間の動圧ラジアル軸受部に十分に潤滑剤を行き
渡らせることを容易に行い得ると共に、軸体のうち潤滑
剤流出防止溝よりも突出部側の外周面は、軸体挿入の際
における潤滑剤の付着が防止される。また、軸体挿入完
了後において、略円筒面形状外周部と略円筒面形状内周
部の間に介在する潤滑剤が潤滑剤流出防止溝を越えて突
出部側へ移動して外部へと漏出することが防止される。
更に、スリーブ側中間溝部と軸体側中間溝部が相対する
部分において、モータ回転時における潤滑剤の抵抗が低
いので、全体としての回転抵抗が低減される。According to the spindle motor of the present invention, when the shaft body is inserted into the inner peripheral portion of the sleeve body having the substantially cylindrical surface shape from its protruding portion and is inserted into the lubricant outflow preventing groove,
By disposing a lubricant at the entrance of the inner surface of the cylindrical body of the sleeve body and by further inserting the shaft body, the lubricant can be sufficiently spread over the dynamic pressure radial bearing section between the sleeve body and the shaft body. In addition, the outer peripheral surface of the shaft body on the projecting side of the lubricant outflow prevention groove is prevented from adhering the lubricant when the shaft body is inserted. Also, after the shaft is completely inserted, the lubricant existing between the outer peripheral portion of the substantially cylindrical surface shape and the inner peripheral portion of the substantially cylindrical surface shape moves over the lubricant outflow prevention groove to the protruding side and leaks to the outside. Is prevented.
Furthermore, since the resistance of the lubricant during motor rotation is low at the portion where the sleeve-side intermediate groove portion and the shaft-side intermediate groove portion face each other, the overall rotational resistance is reduced.
【図1】スピンドルモータの断面図である。FIG. 1 is a sectional view of a spindle motor.
【図2】図1の要部拡大図である。FIG. 2 is an enlarged view of a main part of FIG.
【図3】図1の要部拡大図である。FIG. 3 is an enlarged view of a main part of FIG.
【図4】図1の要部拡大図である。FIG. 4 is an enlarged view of a main part of FIG.
【図5】スピンドルモータの組み立て工程図である。FIG. 5 is an assembly process diagram of a spindle motor.
【図6】スピンドルモータの組み立て工程図である。FIG. 6 is an assembly process diagram of a spindle motor.
【図7】スピンドルモータの組み立て工程図である。FIG. 7 is an assembly process diagram of a spindle motor.
【図8】スピンドルモータの組み立て工程図である。FIG. 8 is an assembly process diagram of a spindle motor.
12 固定軸体 12b ラジアル受部 12c 軸体側中間溝部 12d 軸体側潤滑剤流出防止溝 20 スリーブ部材 20a ラジアル滑部 20d スリーブ側中間溝部 36 ラジアル動圧軸受部 38 ラジアル動圧軸受部 39 潤滑剤 12 Fixed shaft body 12b Radial receiving part 12c Shaft side intermediate groove part 12d Shaft side lubricant outflow prevention groove 20 Sleeve member 20a Radial sliding part 20d Sleeve side intermediate groove part 36 Radial dynamic pressure bearing part 38 Radial dynamic pressure bearing part 39 Lubricant
Claims (1)
部を有してなるスリーブ体とを備えてなり、 軸体に対しスリーブ体が、潤滑剤を介して自在に相対回
転し得るスピンドルモータであって、 軸体の一端側に、スリーブ体の略円筒面形状内周部から
突出した突出部を有し、軸体の略円筒面形状外周部のう
ちスリーブ体の略円筒面形状内周部に相対する部分に、
内表面に撥油処理が施された環状の潤滑剤流出防止溝を
有し、 略円筒面形状外周部と略円筒面形状内周部との間隙部の
うち、潤滑剤流出防止溝からみて突出部とは逆の側にお
ける少なくとも2個所に、軸体に対するスリーブ体の相
対回転により、介装された潤滑剤に荷重支持圧を発生さ
せるラジアル動圧軸受部を有し、 ラジアル動圧軸受部同士の間において、略円筒面形状外
周部及び略円筒面形状内周部に、それぞれ軸体側中間溝
部及びスリーブ側中間溝部を向い合った状態で有するこ
とを特徴とするスピンドルモータ。1. A shaft body having a substantially cylindrical surface-shaped outer peripheral portion, and a sleeve body having a substantially cylindrical surface-shaped inner peripheral portion externally fitted to the substantially cylindrical surface-shaped outer peripheral portion. In the spindle motor in which the sleeve body can freely rotate relative to the shaft body via the lubricant, a protruding portion protruding from the substantially cylindrical inner surface of the sleeve body is provided on one end side of the shaft body. Having a portion of the outer peripheral portion of the substantially cylindrical surface of the shaft body facing the inner peripheral portion of the substantially cylindrical surface of the sleeve body,
It has an annular lubricant outflow prevention groove with oil repellent treatment on the inner surface, and protrudes from the lubricant outflow prevention groove in the gap between the outer peripheral part of the substantially cylindrical surface shape and the inner peripheral part of the substantially cylindrical surface shape. At least two locations on the side opposite to the section have radial dynamic pressure bearing portions for generating load supporting pressure on the interposed lubricant by relative rotation of the sleeve body with respect to the shaft body. A spindle motor characterized by having a shaft-side intermediate groove portion and a sleeve-side intermediate groove portion facing each other on a substantially cylindrical surface-shaped outer peripheral portion and a substantially cylindrical surface-shaped inner peripheral portion, respectively.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP05006593A JP3234030B2 (en) | 1993-02-15 | 1993-02-15 | Spindle motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP05006593A JP3234030B2 (en) | 1993-02-15 | 1993-02-15 | Spindle motor |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH06245427A true JPH06245427A (en) | 1994-09-02 |
JP3234030B2 JP3234030B2 (en) | 2001-12-04 |
Family
ID=12848599
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP05006593A Expired - Fee Related JP3234030B2 (en) | 1993-02-15 | 1993-02-15 | Spindle motor |
Country Status (1)
Country | Link |
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JP (1) | JP3234030B2 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
US6219199B1 (en) | 1997-09-12 | 2001-04-17 | Matsushita Electric Industrial Co., Ltd. | Spindle device having a dynamic-pressure-fluid bearing |
WO2009001960A1 (en) * | 2007-06-28 | 2008-12-31 | Nidec Corporation | Fluid dynamic pressure bearing, motor with the fluid dynamic pressure bearing, and method of producing fluid dynamic pressure bearing |
JP2015055202A (en) * | 2013-09-12 | 2015-03-23 | ダイキン工業株式会社 | Rotary compressor |
JP2016102557A (en) * | 2014-11-28 | 2016-06-02 | 大豊工業株式会社 | Half bearing |
-
1993
- 1993-02-15 JP JP05006593A patent/JP3234030B2/en not_active Expired - Fee Related
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
US6219199B1 (en) | 1997-09-12 | 2001-04-17 | Matsushita Electric Industrial Co., Ltd. | Spindle device having a dynamic-pressure-fluid bearing |
US6301074B2 (en) | 1997-09-12 | 2001-10-09 | Matsushita Electric Industrial Co. Ltd. | Spindle device having a dynamic-pressure-fluid bearing |
US6404586B2 (en) | 1997-09-12 | 2002-06-11 | Matsushita Electric Industrial Co., Ltd. | Spindle device having a dynamic-pressure-fluid bearing |
WO2009001960A1 (en) * | 2007-06-28 | 2008-12-31 | Nidec Corporation | Fluid dynamic pressure bearing, motor with the fluid dynamic pressure bearing, and method of producing fluid dynamic pressure bearing |
JP2015055202A (en) * | 2013-09-12 | 2015-03-23 | ダイキン工業株式会社 | Rotary compressor |
JP2016102557A (en) * | 2014-11-28 | 2016-06-02 | 大豊工業株式会社 | Half bearing |
Also Published As
Publication number | Publication date |
---|---|
JP3234030B2 (en) | 2001-12-04 |
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