JPH06121484A - Spindle motor - Google Patents
Spindle motorInfo
- Publication number
- JPH06121484A JPH06121484A JP4297827A JP29782792A JPH06121484A JP H06121484 A JPH06121484 A JP H06121484A JP 4297827 A JP4297827 A JP 4297827A JP 29782792 A JP29782792 A JP 29782792A JP H06121484 A JPH06121484 A JP H06121484A
- Authority
- JP
- Japan
- Prior art keywords
- hub
- bracket
- boss
- shaft
- thrust bearing
- 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
- 239000012530 fluid Substances 0.000 claims abstract description 17
- 230000002093 peripheral effect Effects 0.000 description 17
- 230000004323 axial length Effects 0.000 description 2
- 230000002940 repellent Effects 0.000 description 2
- 239000005871 repellent Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/10—Sliding-contact bearings for exclusively rotary movement for both radial and axial load
- F16C17/102—Sliding-contact bearings for exclusively rotary movement for both radial and axial load with grooves in the bearing surface to generate hydrodynamic pressure
- F16C17/107—Sliding-contact bearings for exclusively rotary movement for both radial and axial load with grooves in the bearing surface to generate hydrodynamic pressure with at least one surface for radial load and at least one surface for axial load
-
- 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
- F16C2370/00—Apparatus relating to physics, e.g. instruments
- F16C2370/12—Hard disk drives or the like
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Sliding-Contact Bearings (AREA)
- Motor Or Generator Frames (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はスピンドルモータ、特
に、動圧流体スラストベアリングを用いたスピンドルモ
ータに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle motor, and more particularly to a spindle motor using a hydrodynamic thrust bearing.
【０００２】[0002]
【従来の技術】従来、動圧流体スラストベアリングを用
いたスピンドルモータとしては、図７に示すものがあっ
た。2. Description of the Related Art Conventionally, a spindle motor using a hydrodynamic thrust bearing has been shown in FIG.
【０００３】即ち、このスピンドルモータは、ブラケッ
トａに一端部ｂが固定されるシャフトｃと、シャフトｃ
に回転自在に枢支されるボス部ｄを有するハブｅと、を
備える。That is, this spindle motor has a shaft c having one end b fixed to a bracket a, and a shaft c.
And a hub e having a boss portion d rotatably supported by the hub.
【０００４】そして、シャフトｃの他端部ｆに、リング
体ｇを外嵌固定し、このリング体ｇの両面に、夫々動圧
発生溝が形成される。A ring body g is externally fitted and fixed to the other end portion f of the shaft c, and dynamic pressure generating grooves are formed on both surfaces of the ring body g.
【０００５】また、ハブｅの上壁に凹部ｈが形成され、
この凹部ｈに上記リング体ｇが内装され、この凹部ｈの
開口部が施蓋部材ｉにて施蓋される。そして、この凹部
ｈ内に流体ベアリングの流体としての油が充填される。A recess h is formed on the upper wall of the hub e,
The ring body g is housed in the recess h, and the opening of the recess h is covered by the cover member i. Then, the recess h is filled with oil as the fluid of the fluid bearing.
【０００６】従って、リング体ｇの内面側に、ハブｅに
軸心方向内方（ブラケット側）への押圧力を付与する動
圧流体スラストベアリング部が形成され、リング体ｇの
外面側に、ハブｅに上記押圧力と反対の方向の押圧力を
付与する動圧流体スラストベアリング部が形成され、こ
れにより、ハブｅは、軸心方向所定位置に保持される。Therefore, a dynamic fluid thrust bearing portion is formed on the inner surface side of the ring body g for applying a pressing force to the hub e inward in the axial direction (bracket side), and on the outer surface side of the ring body g. The hub e is formed with a hydrodynamic thrust bearing portion that applies a pressing force in a direction opposite to the pressing force, whereby the hub e is held at a predetermined position in the axial direction.
【０００７】なお、シャフトｃのボス部対応面部には、
複数の溝が形成されてなる一対の溝形成部ｊ，ｊが形成
され、ボス部ｄの内周面とシャフトｃのボス部対応面部
との間に上述の油が充填され、一対の動圧流体ラジアル
ベアリング部ｋ，ｋが形成される。これによってハブｅ
はブラケットａに対して回転自在に支持される。The boss-corresponding surface portion of the shaft c is
A pair of groove forming parts j, j formed by forming a plurality of grooves are formed, and the above-mentioned oil is filled between the inner peripheral surface of the boss portion d and the boss-corresponding surface portion of the shaft c. Fluid radial bearing parts k, k are formed. This makes hub e
Is rotatably supported with respect to the bracket a.
【０００８】[0008]
【発明が解決しようとする課題】従って、上述の従来の
スピンドルモータでは、施蓋部材ｉを必要とする。Therefore, the above-mentioned conventional spindle motor requires the lidding member i.
【０００９】そのため、部品点数が増加すると共に組立
て工数が増加し、また、軸心方向への占有スペースを要
するためラジアルベアリング部ｋ，ｋ間が短くなり、ラ
ジアル軸剛性が小さくなる。さらに、コイルスペースも
小さくなる欠点もあった。Therefore, the number of parts is increased, the number of assembling steps is increased, and the space occupied in the axial direction is required, so that the distance between the radial bearing parts k is shortened and the radial shaft rigidity is reduced. Further, there is a drawback that the coil space is also reduced.
【００１０】そこで、本発明では、施蓋部材が不要とな
って、全体の部品点数の減少を図ることができ、かつ、
コイルスペースの増加による出力の向上や効率の向上等
も図ることが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, according to the present invention, the cover member is not required, and the total number of parts can be reduced, and
An object of the present invention is to provide a spindle motor capable of improving output and efficiency by increasing the coil space.
【００１１】[0011]
【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、本発明に係るスピンドルモータは、ブラケットに
一端部が固定されるシャフトと、該シャフトに回転自在
に枢支されるボス部を有するハブと、を備えたスピンド
ルモータに於て、上記シャフトの他端部側に、上記ハブ
に軸心方向内方への第１押圧力を付与する第１動圧流体
スラストベアリング部を設けると共に、上記ハブのボス
部のブラケット対応端面とこれに対面するブラケットの
ボス部対応面との間に、上記ハブに上記第１押圧力と反
対の方向の第２押圧力を付与する第２動圧流体スラスト
ベアリング部を設けたものである。In order to achieve the above object, a spindle motor according to the present invention comprises a shaft having one end fixed to a bracket and a boss rotatably supported on the shaft. In a spindle motor including the hub having the first hydrodynamic thrust bearing portion for applying a first pressing force to the hub inward in the axial direction, on the other end side of the shaft, A second dynamic pressure that applies a second pressing force in a direction opposite to the first pressing force to the hub between a bracket-corresponding end surface of the hub boss and a bracket-facing surface of the bracket facing the hub. A fluid thrust bearing portion is provided.
【００１２】[0012]
【作用】ハブは、第１動圧流体スラストベアリング部に
て軸心方向内方への第１押圧力が付与され、第２動圧流
体スラストベアリング部にて第１押圧力と反対の第２押
圧力（軸心方向内方の押圧力）が付与されるので、ハブ
は軸心方向所定位置に位置決めされ、保持される。In the hub, the first hydrodynamic thrust bearing portion applies a first pressing force inward in the axial direction, and the second hydrodynamic fluid thrust bearing portion applies a second pressing force opposite to the first pressing force. Since a pressing force (a pressing force inward in the axial direction) is applied, the hub is positioned and held at a predetermined position in the axial direction.
【００１３】そして、第１押圧力と反対の第２押圧力を
付与する第２動圧流体スラストベアリング部は、ハブの
ボス部のブラケット対応面とこれに対面するブラケット
のボス部対応面との間に設けられるので、従来のよう
に、ハブの凹部に施蓋部材を設けて、リング体の外面側
に、動圧流体スラストベアリング部を設ける必要がな
い。The second hydrodynamic thrust bearing portion, which applies a second pressing force opposite to the first pressing force, is formed between the face of the hub corresponding to the bracket and the face of the bracket facing the bracket. Since it is provided between them, it is not necessary to provide a lidding member in the recess of the hub and to provide a hydrodynamic fluid thrust bearing portion on the outer surface side of the ring body as in the conventional case.
【００１４】[0014]
【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.
【００１５】図１は本発明に係るスピンドルモータを示
し、このモータは、ブラケット１に一端部２ａが固定さ
れるシャフト２と、該シャフト２に回転自在に枢支され
るボス部３を有するハブ４と、を備える。FIG. 1 shows a spindle motor according to the present invention. This motor has a hub having a shaft 2 whose one end 2a is fixed to a bracket 1 and a boss portion 3 which is rotatably supported by the shaft 2. 4 and.
【００１６】即ち、ブラケット１のボス部５にシャフト
２の一端部２ａが挿入固着され、該ボス部５にステータ
６が固定される。That is, the one end portion 2a of the shaft 2 is inserted and fixed to the boss portion 5 of the bracket 1, and the stator 6 is fixed to the boss portion 5.
【００１７】なお、ステータ６は、ステータコア６ａと
ステータコア６ａに巻設されるステータコイル６ｂとか
らなる。The stator 6 comprises a stator core 6a and a stator coil 6b wound around the stator core 6a.
【００１８】しかして、ハブ４は、円筒状の周壁７と、
上壁８と、該上壁８から垂下されるボス部３と、からな
り、図示省略の磁気ディスクが取付けられる。また、上
壁８の上面には、凹部９が設けられる。なお、ハブ４の
周壁７の内周面にはロータマグネット10が付設される。The hub 4 has a cylindrical peripheral wall 7 and
The upper wall 8 and the boss portion 3 that hangs down from the upper wall 8 are attached to a magnetic disk (not shown). A recess 9 is provided on the upper surface of the upper wall 8. A rotor magnet 10 is attached to the inner peripheral surface of the peripheral wall 7 of the hub 4.
【００１９】また、シャフト２は、ハブ４の軸心孔11に
挿通されるが、この場合、シャフト２の外周面12には、
複数の溝が形成されてなる一対の溝形成部15，15が形成
されると共に、シャフト２の外周面12と軸心孔11の内周
面との間の隙間に油が充填され、これにより、一対の動
圧ラジアルベアリング部16，16が形成される。The shaft 2 is inserted into the shaft center hole 11 of the hub 4. In this case, the outer peripheral surface 12 of the shaft 2 is
A pair of groove forming portions 15, 15 formed by forming a plurality of grooves are formed, and oil is filled in a gap between the outer peripheral surface 12 of the shaft 2 and the inner peripheral surface of the shaft center hole 11, whereby , A pair of dynamic pressure radial bearing portions 16, 16 are formed.
【００２０】しかして、このスピンドルモータには、シ
ャフト２の他端部２ｂ側に、ハブ４に軸心方向内方への
第１押圧力Ｆ1 を付与する第１動圧流体スラストベアリ
ング部17が設けられ、ハブ４のボス部３のブラケット対
応端面13とこれに対面するブラケット１のボス部対応面
14との間に、ハブ４に上記押圧力Ｆ1 と反対の方向へ第
２押圧力Ｆ2 を付与する第２動圧流体スラストベアリン
グ部18が設けられる。In this spindle motor, however, the first hydrodynamic thrust bearing portion 17 for applying the first pressing force F 1 to the hub 4 inward in the axial direction is provided on the other end 2b side of the shaft 2. Is provided, and the bracket-corresponding end surface 13 of the boss portion 3 of the hub 4 and the boss-corresponding surface of the bracket 1 facing the end surface 13
A second hydrodynamic thrust bearing portion 18 that applies a second pressing force F 2 to the hub 4 in a direction opposite to the pressing force F 1 is provided between the hub 4 and the hub 14.
【００２１】即ち、シャフト２の他端部２ｂ側に、ハブ
４の凹部９に内装されるリング体19が外嵌固着される。
この場合、リング体19の裏面20には、図２に示すよう
に、多数の溝22…が形成されると共に、リング体19の裏
面20と凹部９の底面21との間に油が充填され、これによ
り、第１動圧流体スラストベアリング部17が形成され
る。なお、溝22…はスパイラル状に配設される。That is, the ring body 19 housed in the recess 9 of the hub 4 is externally fitted and fixed to the other end 2b side of the shaft 2.
In this case, a large number of grooves 22 are formed on the back surface 20 of the ring body 19 as shown in FIG. 2, and oil is filled between the back surface 20 of the ring body 19 and the bottom surface 21 of the recess 9. As a result, the first hydrodynamic thrust bearing portion 17 is formed. The grooves 22 ... Are arranged in a spiral shape.
【００２２】また、ボス部３のブラケット対応端面13に
は、図３に示すように、多数の溝23…が形成されると共
に、ブラケット対応端面13とこれに対面するブラケット
１のボス部対応面14との間に油が充填され、これによ
り、第２動圧流体スラストベアリング部18が形成され
る。As shown in FIG. 3, a large number of grooves 23 are formed in the bracket-corresponding end surface 13 of the boss portion 3, and the bracket-corresponding end surface 13 and the boss portion-corresponding surface of the bracket 1 which faces the bracket-corresponding end surface 13 are formed. An oil is filled between the bearing 14 and the second bearing 14, thereby forming the second hydrodynamic thrust bearing portion 18.
【００２３】従って、油は、リング体19の裏面20と凹部
９の底面21との間からブラケット対応端面13とボス部対
応面14との間までに油が充填されることになる。Therefore, the oil is filled between the back surface 20 of the ring body 19 and the bottom surface 21 of the recess 9 and between the bracket-corresponding end surface 13 and the boss-corresponding surface 14.
【００２４】そこで、この場合、油飛散防止のために、
リング体19の外周面24とこれに対面する凹部９の内周面
25とに、夫々、撥油処理を施すと共に、ボス部３の外周
面26のブラケット対応端面13側の周面部27とこれに対面
するステータコア６ａの内周面28の対応部29との間にも
撥油処理を施すのが好ましい。Therefore, in this case, in order to prevent oil scattering,
The outer peripheral surface 24 of the ring body 19 and the inner peripheral surface of the concave portion 9 facing the outer peripheral surface 24.
25 and 25 are respectively subjected to oil repellent treatment, and between the peripheral surface portion 27 of the outer peripheral surface 26 of the boss portion 3 on the bracket corresponding end surface 13 side and the corresponding portion 29 of the inner peripheral surface 28 of the stator core 6a facing this. It is also preferable to apply an oil repellent treatment.
【００２５】撥油処理とは、例えば撥油性に優れたフッ
素系の樹脂を用いてコーティング等を行なうことをい
う。The oil repellency treatment means, for example, coating with a fluorine resin having excellent oil repellency.
【００２６】このように構成されたスピンドルモータに
よれば、第１動圧流体スラストベアリング部17と第２動
圧流体スラストベアリング部18とによってハブ４が軸心
方向所定位置に位置決めされた状態で保持されつつ回転
する。According to the spindle motor configured as described above, the hub 4 is positioned at the predetermined axial position by the first hydrodynamic fluid thrust bearing portion 17 and the second hydrodynamic fluid thrust bearing portion 18. It rotates while being held.
【００２７】また、リング体19の外面30側に、ハブ４に
動圧流体スラストベアリング部を設ける必要がなくな
り、リング体19の外面30に対面する施蓋部材を設ける必
要がなくなる。Further, it is not necessary to provide a dynamic pressure fluid thrust bearing portion on the hub 4 on the outer surface 30 side of the ring body 19, and it is not necessary to provide a lidding member facing the outer surface 30 of the ring body 19.
【００２８】従って、施蓋部材が省略される分、全体の
部品点数が減少し、組立て易くなり、また、軸心方向長
さが同一である従来のスピンドルモータ（施蓋部材を有
する。）と比べた場合、施蓋部材が省略される分、ハブ
４内部の空間を大きくとることができ、これにより、コ
イルスペースの増加を図ることができて、モータとして
のパワーを向上させることができると共に巻線作業が容
易となる。Therefore, since the cover member is omitted, the total number of parts is reduced, the assembly is facilitated, and the conventional spindle motor (having the cover member) has the same axial length. In comparison, since the lidding member is omitted, the space inside the hub 4 can be made larger, and thus the coil space can be increased and the power of the motor can be improved. Winding work becomes easy.
【００２９】さらに、動圧ラジアルベアリング部16，16
間の距離を大きくすることができ、安定した回転を得る
ことができる。Further, the dynamic pressure radial bearing portions 16, 16
The distance between them can be increased, and stable rotation can be obtained.
【００３０】図４はシャフト２の変形例を示し、この場
合、シャフト２とリング体19とが一体形成されたもので
ある。FIG. 4 shows a modified example of the shaft 2. In this case, the shaft 2 and the ring body 19 are integrally formed.
【００３１】次に、図５は他の実施例の要部を示し、こ
の場合、ブラケット１のボス部５には、凹窪部31が形成
され、この凹窪部31内に、ハブ４のブラケット対応端面
13が挿入される。Next, FIG. 5 shows an essential part of another embodiment. In this case, the boss portion 5 of the bracket 1 is provided with a concave recess portion 31 in which the hub 4 is inserted. Bracket compatible end surface
13 is inserted.
【００３２】即ち、凹窪部31の底面をもってボス部対応
面14とし、このボス部対応面14に、図３に示すように、
多数の溝23…を形成すると共に、このボス部対応面14と
ブラケット対応端面13との間に油を充填する。That is, the bottom surface of the concave portion 31 serves as the boss-corresponding surface 14, and as shown in FIG.
A large number of grooves 23 are formed, and oil is filled between the boss corresponding surface 14 and the bracket corresponding end surface 13.
【００３３】従って、この実施例によれば、油の飛散が
有効に防止される。Therefore, according to this embodiment, the scattering of oil is effectively prevented.
【００３４】さらに、ボス部３の外周面26のブラケット
対応端面13側の周面部27と、これに対面する凹窪部31の
内周面32とに、撥油性に優れた樹脂をコーティングする
撥油処理を施すのも好ましい。Further, the outer peripheral surface 26 of the outer peripheral surface 26 of the boss portion 3 on the bracket-corresponding end surface 13 side and the inner peripheral surface 32 of the concave portion 31 facing the outer peripheral surface 27 are coated with a resin having excellent oil repellency. It is also preferable to apply oil treatment.
【００３５】また、図６は別の実施例の要部を示し、こ
の場合、ブラケット１のボス部５を、フランジ部33に一
体の本体34と、この本体34に取付けられるリング体35
と、から形成している。FIG. 6 shows a main part of another embodiment. In this case, the boss portion 5 of the bracket 1 is a body 34 integral with the flange portion 33 and a ring body 35 attached to the body 34.
It is formed from.
【００３６】即ち、リング体35の表て面をもってボス部
対応面14とし、このボス部対応面14に、多数の溝を形成
すると共に、このボス部対応面14とブラケット対応端面
13との間に油を充填している。That is, the front surface of the ring body 35 is used as the boss-corresponding surface 14, a large number of grooves are formed in the boss-corresponding surface 14, and the boss-corresponding surface 14 and the bracket-corresponding end surface are formed.
It is filled with oil between 13 and.
【００３７】従って、この場合、溝はリング体35に形成
されるものであり、しかも、このリング体35は別部材と
して製造することができるので、その溝加工を簡単に行
なうことができる利点がある。Therefore, in this case, the groove is formed in the ring body 35, and since the ring body 35 can be manufactured as a separate member, there is an advantage that the groove processing can be easily performed. is there.
【００３８】なお、本発明は上述の実施例に限定され
ず、本発明の要旨を逸脱しない範囲で設計変更自由であ
り、例えば、第１動圧流体スラストベアリング部17を形
成するための溝22を、図例とは逆に、リング体19の裏面
20に対面する凹部９の底面21に形成するも自由であり、
また、第２動圧流体スラストベアリング部18を形成する
ための溝23を、図１と図５とは逆にボス部対応面14に形
成するも自由である。The present invention is not limited to the above-mentioned embodiment, and the design can be freely changed without departing from the gist of the present invention. For example, the groove 22 for forming the first hydrodynamic thrust bearing portion 17 is provided. Contrary to the example shown,
It is also free to form on the bottom surface 21 of the concave portion 9 facing the 20.
Further, it is also possible to form the groove 23 for forming the second hydrodynamic thrust bearing portion 18 on the boss portion corresponding surface 14 contrary to FIGS. 1 and 5.
【００３９】[0039]
【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.
【００４０】従来では必要としていた施蓋部材を省略す
ることができ、これにより、部品点数の減少及び組立工
数の減少を図ることができ、低コストに簡単に製造する
ことができる。It is possible to omit the lid-applying member which has been required in the past, and thereby the number of parts and the number of assembling steps can be reduced, and the manufacturing can be easily performed at low cost.
【００４１】また、施蓋部材を有する従来のスピンドル
モータと比べた場合、軸心方向長さを同じであれば、コ
イルスペースの増加を図ることができ、モータとしての
パワーを向上させることができると共に、モータ効率の
向上を図ることができ、しかも巻線作業も容易に行なえ
る利点がある。When compared with a conventional spindle motor having a cover member, if the axial length is the same, the coil space can be increased and the power of the motor can be improved. At the same time, there is an advantage that the motor efficiency can be improved and the winding work can be easily performed.
【００４２】さらに、施蓋部材を省略することができる
ので、その分、ラジアルベアリング部16，16間の距離を
大きくとることができ、ラジアル軸受けとしての剛性の
増加を図れ、ハブ４は常に安定して回転することができ
る。Further, since the cover member can be omitted, the distance between the radial bearing portions 16 and 16 can be increased correspondingly, the rigidity of the radial bearing can be increased, and the hub 4 is always stable. Then you can rotate.
【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】リング体の斜視図である。FIG. 2 is a perspective view of a ring body.
【図３】ハブのボス部の底面図である。FIG. 3 is a bottom view of a hub boss portion.
【図４】シャフトの変形例を示す断面図である。FIG. 4 is a cross-sectional view showing a modified example of the shaft.
【図５】他の実施例の要部断面図である。FIG. 5 is a cross-sectional view of main parts of another embodiment.
【図６】別の実施例の要部断面図である。FIG. 6 is a cross-sectional view of main parts of another embodiment.
【図７】従来のスピンドルモータを示す断面図である。FIG. 7 is a sectional view showing a conventional spindle motor.
１ ブラケット ２ シャフト ２ａ 一端部 ２ｂ 他端部 ３ ボス部 ４ ハブ 13 ブラケット対応端面 14 ボス部対応面 17 第１動圧流体スラストベアリング部 18 第２動圧流体スラストベアリング部 Ｆ1 第１押圧力 Ｆ2 第２押圧力1 Bracket 2 Shaft 2a One end 2b The other end 3 Boss 4 Hub 13 Bracket corresponding end face 14 Boss corresponding face 17 1st hydrodynamic fluid thrust bearing part 18 2nd hydrodynamic fluid thrust bearing part F 1 1st pressing force F 2 Second pressing force
Claims (1)
シャフト２と、該シャフト２に回転自在に枢支されるボ
ス部３を有するハブ４と、を備えたスピンドルモータに
於て、上記シャフト２の他端部２ｂ側に、上記ハブ４に
軸心方向内方への第１押圧力Ｆ1 を付与する第１動圧流
体スラストベアリング部17を設けると共に、上記ハブ４
のボス部３のブラケット対応端面13とこれに対面するブ
ラケット１のボス部対応面14との間に、上記ハブ４に上
記第１押圧力Ｆ1 と反対の方向の第２押圧力Ｆ2 を付与
する第２動圧流体スラストベアリング部18を設けたこと
を特徴とするスピンドルモータ。1. A spindle motor comprising: a shaft 2 having one end 2a fixed to a bracket 1; and a hub 4 having a boss portion 3 rotatably supported by the shaft 2. A second hydrodynamic thrust bearing portion 17 for applying a first pressing force F 1 to the hub 4 inward in the axial direction is provided on the other end portion 2b side of the hub 2, and the hub 4 is also provided.
The second pressing force F 2 in the direction opposite to the first pressing force F 1 is applied to the hub 4 between the bracket corresponding end surface 13 of the boss portion 3 and the boss corresponding surface 14 of the bracket 1 facing the boss portion 3. A spindle motor characterized in that a second dynamic fluid thrust bearing portion (18) to be provided is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04297827A JP3122260B2 (en) | 1992-10-09 | 1992-10-09 | Spindle motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04297827A JP3122260B2 (en) | 1992-10-09 | 1992-10-09 | Spindle motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06121484A true JPH06121484A (en) | 1994-04-28 |
| JP3122260B2 JP3122260B2 (en) | 2001-01-09 |
Family
ID=17851674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04297827A Expired - Lifetime JP3122260B2 (en) | 1992-10-09 | 1992-10-09 | Spindle motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3122260B2 (en) |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06150529A (en) * | 1992-11-12 | 1994-05-31 | Nec Corp | Spindle motor for magnetic disk device |
| US8277125B2 (en) | 2009-06-12 | 2012-10-02 | Nidec Corporation | Bearing apparatus, spindle motor, and disk drive apparatus |
| US8337086B2 (en) | 2009-06-18 | 2012-12-25 | Nidec Corporation | Bearing apparatus, spindle motor, and disk drive apparatus |
| US8472132B2 (en) | 2008-05-26 | 2013-06-25 | Nidec Corporation | Fluid dynamic bearing apparatus arranged to discharge air bubbles generated therein and a spindle motor and a disk drive apparatus including the same |
| US8508883B2 (en) | 2011-09-30 | 2013-08-13 | Nidec Corporation | Motor including hydrodynamic bearing and disk drive apparatus including same |
| US8514515B2 (en) | 2011-09-30 | 2013-08-20 | Nidec Corporation | Motor and disk drive apparatus |
| US8582233B2 (en) | 2012-02-01 | 2013-11-12 | Nidec Corporation | Motor and disk drive apparatus |
| US8587895B1 (en) | 2012-05-30 | 2013-11-19 | Nidec Corporation | Bearing mechanism, motor and disk drive apparatus |
| US8599513B1 (en) | 2012-05-30 | 2013-12-03 | Nidec Corporation | Bearing mechanism, motor, and disk drive apparatus |
| US8630063B2 (en) | 2012-05-30 | 2014-01-14 | Nidec Corporation | Bearing mechanism, motor, and disk drive apparatus |
| US8670209B2 (en) | 2012-07-13 | 2014-03-11 | Nidec Corporation | Spindle motor including a fluid dynamic bearing and disk drive apparatus with same |
| US8690435B2 (en) | 2009-11-25 | 2014-04-08 | Nidec Corporation | Dynamic pressure bearing and spindle motor using the same |
| US8711514B2 (en) | 2011-09-30 | 2014-04-29 | Nidec Corporation | Motor and disk drive apparatus |
| US8724257B2 (en) | 2012-09-18 | 2014-05-13 | Nidec Corporation | Hydrodynamic bearing apparatus and spindle motor and disk drive apparatus including the same |
| US8724256B2 (en) | 2012-09-18 | 2014-05-13 | Nidec Corporation | Bearing apparatus, spindle motor, and disk drive apparatus |
| US8773816B1 (en) | 2013-03-13 | 2014-07-08 | Nidec Corporation | Spindle motor with hydrodynamic bearing structure having capillary seal and disk drive apparatus including same |
| US8797678B1 (en) | 2013-03-14 | 2014-08-05 | Nidec Corporation | Spindle motor and disk drive apparatus |
| US8794839B2 (en) | 2009-06-12 | 2014-08-05 | Nidec Corporation | Bearing apparatus, spindle motor, and disk drive apparatus |
| US8941946B2 (en) | 2013-03-14 | 2015-01-27 | Nidec Corporation | Motor including dynamic bearing with seal portion and disk drive apparatus including the same |
| US9001460B2 (en) | 2013-08-21 | 2015-04-07 | Nidec Corporation | Spindle motor, and disk drive apparatus |
-
1992
- 1992-10-09 JP JP04297827A patent/JP3122260B2/en not_active Expired - Lifetime
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06150529A (en) * | 1992-11-12 | 1994-05-31 | Nec Corp | Spindle motor for magnetic disk device |
| US8472132B2 (en) | 2008-05-26 | 2013-06-25 | Nidec Corporation | Fluid dynamic bearing apparatus arranged to discharge air bubbles generated therein and a spindle motor and a disk drive apparatus including the same |
| US8517611B2 (en) | 2009-06-12 | 2013-08-27 | Nidec Corporation | Bearing apparatus, spindle motor, and disk drive apparatus |
| US8568033B2 (en) | 2009-06-12 | 2013-10-29 | Nidec Corporation | Bearing apparatus, spindle motor, and disk drive apparatus |
| US8967865B2 (en) | 2009-06-12 | 2015-03-03 | Nidec Corporation | Bearing apparatus, spindle motor, and disk drive apparatus |
| US8277125B2 (en) | 2009-06-12 | 2012-10-02 | Nidec Corporation | Bearing apparatus, spindle motor, and disk drive apparatus |
| US8794839B2 (en) | 2009-06-12 | 2014-08-05 | Nidec Corporation | Bearing apparatus, spindle motor, and disk drive apparatus |
| US8337086B2 (en) | 2009-06-18 | 2012-12-25 | Nidec Corporation | Bearing apparatus, spindle motor, and disk drive apparatus |
| US8690435B2 (en) | 2009-11-25 | 2014-04-08 | Nidec Corporation | Dynamic pressure bearing and spindle motor using the same |
| US8508883B2 (en) | 2011-09-30 | 2013-08-13 | Nidec Corporation | Motor including hydrodynamic bearing and disk drive apparatus including same |
| US8514515B2 (en) | 2011-09-30 | 2013-08-20 | Nidec Corporation | Motor and disk drive apparatus |
| US8711514B2 (en) | 2011-09-30 | 2014-04-29 | Nidec Corporation | Motor and disk drive apparatus |
| US8582233B2 (en) | 2012-02-01 | 2013-11-12 | Nidec Corporation | Motor and disk drive apparatus |
| US8599513B1 (en) | 2012-05-30 | 2013-12-03 | Nidec Corporation | Bearing mechanism, motor, and disk drive apparatus |
| US8630063B2 (en) | 2012-05-30 | 2014-01-14 | Nidec Corporation | Bearing mechanism, motor, and disk drive apparatus |
| US8587895B1 (en) | 2012-05-30 | 2013-11-19 | Nidec Corporation | Bearing mechanism, motor and disk drive apparatus |
| US8670209B2 (en) | 2012-07-13 | 2014-03-11 | Nidec Corporation | Spindle motor including a fluid dynamic bearing and disk drive apparatus with same |
| US8724257B2 (en) | 2012-09-18 | 2014-05-13 | Nidec Corporation | Hydrodynamic bearing apparatus and spindle motor and disk drive apparatus including the same |
| US8724256B2 (en) | 2012-09-18 | 2014-05-13 | Nidec Corporation | Bearing apparatus, spindle motor, and disk drive apparatus |
| US8773816B1 (en) | 2013-03-13 | 2014-07-08 | Nidec Corporation | Spindle motor with hydrodynamic bearing structure having capillary seal and disk drive apparatus including same |
| US8797678B1 (en) | 2013-03-14 | 2014-08-05 | Nidec Corporation | Spindle motor and disk drive apparatus |
| US8941946B2 (en) | 2013-03-14 | 2015-01-27 | Nidec Corporation | Motor including dynamic bearing with seal portion and disk drive apparatus including the same |
| US9001460B2 (en) | 2013-08-21 | 2015-04-07 | Nidec Corporation | Spindle motor, and disk drive apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3122260B2 (en) | 2001-01-09 |
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