JP2971115B2 - Spindle motor - Google Patents

Spindle motor

Info

Publication number
JP2971115B2
JP2971115B2 JP2264613A JP26461390A JP2971115B2 JP 2971115 B2 JP2971115 B2 JP 2971115B2 JP 2264613 A JP2264613 A JP 2264613A JP 26461390 A JP26461390 A JP 26461390A JP 2971115 B2 JP2971115 B2 JP 2971115B2
Authority
JP
Japan
Prior art keywords
hub
bearing
bearing means
spindle motor
bracket
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2264613A
Other languages
Japanese (ja)
Other versions
JPH04161033A (en
Inventor
徳門 小河
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nidec Corp
Original Assignee
Nidec Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nidec Corp filed Critical Nidec Corp
Priority to JP2264613A priority Critical patent/JP2971115B2/en
Publication of JPH04161033A publication Critical patent/JPH04161033A/en
Application granted granted Critical
Publication of JP2971115B2 publication Critical patent/JP2971115B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C27/00—Elastic or yielding bearings or bearing supports, for exclusively rotary movement
    • F16C27/04—Ball or roller bearings, e.g. with resilient rolling bodies
    • 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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/042—Housings for rolling element bearings for rotary movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/52—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
    • F16C19/525—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions related to temperature and heat, e.g. insulation
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2380/00—Electrical apparatus
    • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Motor Or Generator Frames (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Description

【発明の詳細な説明】 〔技術分野〕 本発明は、磁気ディスクの如き記録部材を回転駆動す
るスピンドルモータに関する。Description: TECHNICAL FIELD The present invention relates to a spindle motor for rotating a recording member such as a magnetic disk.

〔従来技術及びその欠点〕(Conventional technology and its disadvantages)

例えば、スピンドルモータは、ブラケットと、ブラケ
ットに対して相対的に回転自在であるハブ手段を備え、
ブラケットとハブ手段との間には軸受手段が介在されて
いる。例えば、軸固定型のスピンドルモータでは、ブラ
ケットに軸部材が固定され、この軸部材に一対の軸受部
材を介してハブ手段が回転自在に支持されている。For example, a spindle motor includes a bracket and hub means that is rotatable relative to the bracket,
Bearing means is interposed between the bracket and the hub means. For example, in a fixed shaft type spindle motor, a shaft member is fixed to a bracket, and hub means is rotatably supported by the shaft member via a pair of bearing members.

しかしながら、従来のスピンドルモータにおいては、
軸受部材の外輪が鉄材料から形成され、ハブ手段がアル
ミニウム材料から形成されており、このことに関連し
て、次の通りの解決すべき問題が存在る。一般に、アル
ミニウム材料の熱膨張係数は鉄材料の熱膨張係数よりも
大きい。それ故に、雰囲気温度が低下した場合に、ハブ
手段の熱収縮量が軸受部材の外輪の熱収縮量よりも大き
くなり、ハブ手段によって軸受部材の外輪に圧縮応力が
作用する。この圧縮応力が大きくなると、軸受部材の外
輪が幾分変形し、かかる変形によりハブ手段（従って、
これに装着されている記録部材）の振れが大きくなり、
このことが原因となってリードライト不良が発生する。However, in the conventional spindle motor,
The outer race of the bearing member is formed from a ferrous material, and the hub means is formed from an aluminum material. In this connection, there are the following problems to be solved. Generally, the coefficient of thermal expansion of an aluminum material is larger than the coefficient of thermal expansion of an iron material. Therefore, when the ambient temperature decreases, the heat shrinkage of the hub means becomes larger than the heat shrinkage of the outer ring of the bearing member, and a compressive stress acts on the outer ring of the bearing member by the hub means. When this compressive stress increases, the outer race of the bearing member deforms somewhat, and the deformation causes the hub means (and thus the
The deflection of the recording member attached to this increases.
This causes a read / write failure.

〔発明の目的〕[Object of the invention]

本発明は、上記事実に鑑みてなされたものであり、そ
の主目的は、温度変化に伴う軸受部材の外輪の変形を効
果的に少なくすることができるスピンドルモータを提供
することである。SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and a main object of the present invention is to provide a spindle motor capable of effectively reducing deformation of an outer ring of a bearing member due to a temperature change.

〔発明の概要〕[Summary of the Invention]

本発明によれば、ブラケットに立設された軸部材と、
該軸部材に一対の軸受手段を介して回転自在に支持され
記録部材が装着されたるハブ手段と、該ハブ手段に装着
されたロータマグネットと、該ロータマグネットに対向
して配設されたステータとを具備するスピンドルモータ
において、該ハブ手段は、一端部内周に一方の軸受手段
が直接装着される逆椀状のハブ本体と該ハブ本体の他端
部内周と他方の軸受手段との間に介在された環状のブッ
シュ部材からなり、ハブ本体の一端部における前記一方
の軸受手段の近傍で当該軸受手段を支持する部位、及び
前記ブッシュ部材における前記他方の軸受手段の近傍に
それぞれ環状凹部が設けられ、かつ該各環状凹部が前記
軸受手段に対してその軸線方向寸法の半分より長い長さ
で半径方向に対向していることを特徴とするスピンドル
モータが提供される。According to the present invention, a shaft member erected on the bracket,
A hub means rotatably supported on the shaft member via a pair of bearing means and having a recording member mounted thereon, a rotor magnet mounted on the hub means, and a stator disposed opposed to the rotor magnet; In the spindle motor, the hub means is interposed between the inner circumference of the other end of the hub body having an inverted bowl shape in which one bearing means is directly mounted on the inner circumference of one end and the other bearing means. A ring-shaped recessed portion is provided at one end of the hub main body in the vicinity of the one bearing means for supporting the bearing means, and in the bush member near the other bearing means. A spindle motor wherein each of the annular recesses is radially opposed to the bearing means by a length longer than half the axial dimension thereof. .

発明の具体例〕 以下、添付図面を参照して、本発明に従うスピンドル
モータの一具体例について説明する。Specific Example of the Invention] Hereinafter, a specific example of the spindle motor according to the present invention will be described with reference to the accompanying drawings.

第１図において、図示のスピンドルモータは、ブラケ
ット２と、ハブ手段４と、ブラケット２及びハブ手段４
の間に介在された一対の軸受部材６及び８（軸受手段を
構成する）とを備えている。ブラケット２は略円形状の
ブラケット本体部10を有している。このブラケット本体
部10の周縁部にはフランジ部12が設けられており、この
フランジ部12が駆動装置のフレーム（図示せず）に取り
付けられる。In FIG. 1, the illustrated spindle motor includes a bracket 2, a hub means 4, a bracket 2 and a hub means 4.
And a pair of bearing members 6 and 8 (constituting bearing means) interposed therebetween. The bracket 2 has a substantially circular bracket body 10. A flange portion 12 is provided on a peripheral portion of the bracket body 10, and the flange portion 12 is attached to a frame (not shown) of the driving device.

ブラケット本体ブラケット10の略中央部には環状垂下
部14が設けられ、かかる垂下部14に軸部材16の一端部
（下端部）が固定されている。軸部材16はブラケット２
から実質上垂直上方に延びており、ハブ手段４は、上記
一対の軸受部材６及び８を介して軸部材16に回転自在に
支持されている。An annular hanging portion 14 is provided at substantially the center of the bracket body bracket 10, and one end (lower end) of the shaft member 16 is fixed to the hanging portion 14. The shaft member 16 is the bracket 2
The hub means 4 is rotatably supported by the shaft member 16 via the pair of bearing members 6 and 8.

ハブ手段４はハブ本体18を備えている。ハブ本体18は
円筒スリーブ状の本体部20を有し、この本体部20の一端
部（下端部）には半径方向外方に突出するフランジ部22
が設けられており、またその他端部（上端部）には半径
方向内方に突出する端壁部24が設けられている。具体例
では、ハブ本体18の一端部が環状のブッシュ部材26を介
して片方の軸受部材６に支持され、ハブ本体18の他端部
が直接他方の軸受部材８に支持されている。ハブ本体18
及びブッシュ部材26は、例えば、アルミニウム材料から
形成することができる。軸受部材６及び８に関連する支
持構造については、後に詳述する。The hub means 4 has a hub body 18. The hub main body 18 has a cylindrical sleeve-shaped main body 20. One end (lower end) of the main body 20 has a flange 22 projecting outward in the radial direction.
The other end portion (upper end portion) is provided with an end wall portion 24 protruding inward in the radial direction. In a specific example, one end of the hub main body 18 is supported by one bearing member 6 via an annular bush member 26, and the other end of the hub main body 18 is directly supported by the other bearing member 8. Hub body 18
And the bush member 26 can be formed from, for example, an aluminum material. The support structure related to the bearing members 6 and 8 will be described later in detail.

このハブ本体18の内周面にはヨーク部材28を介して環
状のロータマグネット30が装着されている。ロータマグ
ネット30に対向してステータ32が配置されている。ステ
ータ32は、軸部材16（一対の軸受部材６及び８間の部
位）に固定されたステータコア34を有し、このステータ
コア34にコイル36が所要の通り巻かれている。ステータ
32のコイル16に電流を所要の通り供給すると、ステータ
32とロータマグネット30の作用によってハブ手段４が所
定方向に回動され、これにより記録部材（図示せず）も
一体に回動される。An annular rotor magnet 30 is mounted on the inner peripheral surface of the hub main body 18 via a yoke member 28. A stator 32 is arranged so as to face the rotor magnet 30. The stator 32 has a stator core 34 fixed to the shaft member 16 (a portion between the pair of bearing members 6 and 8), and a coil 36 is wound around the stator core 34 as required. Stator
When current is supplied to the 32 coils 16 as required, the stator
The hub means 4 is rotated in a predetermined direction by the action of the rotor magnet 32 and the rotor magnet 30, whereby the recording member (not shown) is also integrally rotated.

次いで、ハブ手段４の支持様式について説明する。ま
ず、片方の軸受部材６について説明すると、軸受部材６
は、軸部材16に固定された内輪38と、内輪38の外側に配
設された外輪40と、内輪38及び外輪40の間に介在された
複数個のボール42を有している。内輪38、外輪40及びボ
ール42は、例えば、鉄材料から形成することができる。
そして、外輪40がブッシュ部材26の内周面に固定されて
いる。この軸受部材６に関連して、ブッシュ部材26の径
方向略中央部には、所定幅の環状凹部44が設けられてお
り、環状凹部44は、図示する通り、その一端面（第１図
において上端面）から他端面に向けて軸線方向に延びて
いる。この環状凹部44は、軸受部材６に対しその軸線方
向寸法の半分より長い長さで半径方向に対向している。
尚、環状凹部44をブッシュ部材26の他端面から一端面に
向けて形成するようにしてもよい。かく環状凹部44を設
けることにより、容易に理解される如く、ブッシュ部材
26の内周部46は半径方向外方に幾分弾性変形することが
でき、その外周部48は半径方向内方に幾分弾性変形する
ことができる。Next, the manner of supporting the hub means 4 will be described. First, one of the bearing members 6 will be described.
Has an inner ring 38 fixed to the shaft member 16, an outer ring 40 disposed outside the inner ring 38, and a plurality of balls 42 interposed between the inner ring 38 and the outer ring 40. The inner ring 38, the outer ring 40, and the balls 42 can be formed from, for example, an iron material.
The outer ring 40 is fixed to the inner peripheral surface of the bush member 26. In connection with this bearing member 6, an annular concave portion 44 having a predetermined width is provided at a substantially central portion in the radial direction of the bush member 26, and the annular concave portion 44 has one end surface (in FIG. It extends in the axial direction from the upper end surface) to the other end surface. The annular concave portion 44 is radially opposed to the bearing member 6 with a length longer than half of the axial dimension.
Note that the annular concave portion 44 may be formed from the other end surface of the bush member 26 toward one end surface. By providing the annular recess 44, the bush member is easily understood.
The inner periphery 46 of 26 can be somewhat elastically deformed radially outward, and its outer periphery 48 can be somewhat elastically deformed radially inward.

また、他方の軸受部材８は、上記軸受部材６と実質上
同一の構成であり、軸部材16に固定された内輪50と、ハ
ブ本体18に固定された外輪52と、これら内輪50及び外輪
52の間に介在されたボール54を有している。これら内輪
50、外輪52及びボール54も例えば鉄材料から形成するこ
とができる。この軸受部材８に関連して、更に、ハブ本
体18の端壁24の内周部には、所定幅の環状凹部56が軸受
部材８に近接して設けられており、環状凹部56は、端壁
24の内面（第１図において下面）から外面（第１図にお
いて上面）に向けて軸線方向に延びている。この環状凹
部56は、軸受部材８に対しその軸線方向寸法の半分より
長い長さで半径方向に対向している。かく環状凹部56を
設けることにより、端壁24の内周部58が半径方向内方に
幾分変形することができる。The other bearing member 8 has substantially the same configuration as the bearing member 6, and includes an inner ring 50 fixed to the shaft member 16, an outer ring 52 fixed to the hub main body 18, these inner ring 50 and the outer ring.
It has a ball 54 interposed between 52. These inner rings
The outer ring 50, the outer ring 52, and the balls 54 can also be formed of, for example, an iron material. In connection with this bearing member 8, an annular concave portion 56 having a predetermined width is provided in the inner peripheral portion of the end wall 24 of the hub body 18 in the vicinity of the bearing member 8. wall
24 extends in the axial direction from the inner surface (lower surface in FIG. 1) to the outer surface (upper surface in FIG. 1). The annular recess 56 is radially opposed to the bearing member 8 with a length longer than half the axial dimension. By providing the annular concave portion 56, the inner peripheral portion 58 of the end wall 24 can be slightly deformed radially inward.

軸受部材６及び８の内輪38及び50並びに外輪40及び52
は、圧入又は接着の如き手段により軸部材16及びハブ手
段４に固定される。これら軸受部材６及び８の外側に
は、また、磁性流体シール機構53及び55が配設されてい
る。Inner rings 38 and 50 and outer rings 40 and 52 of bearing members 6 and 8
Is fixed to the shaft member 16 and the hub means 4 by means such as press-fitting or bonding. Outside these bearing members 6 and 8, magnetic fluid sealing mechanisms 53 and 55 are provided.

かかる構成のスピンドルモータにおいては、雰囲気温
度の変化によりハブ手段４と軸受部材６及び８の外輪40
及び52との間に熱変形差が生じると、かかる熱変形差
は、以下の如くして吸収される。片方に軸受部材６側に
おいては、上記熱変形差により応力が発生すると、かか
る応力によってブッシュ部材26の内周部46及び／又は外
周部48が幾分変形し、かかる変形により上記応力が解放
され、かくして軸受部材６の外輪40に比較的大きい応力
が作用することが回避される。また、他方の軸受部材８
側においては、上記熱変形により応力が発生すると、か
かる応力によってハブ本体18の端壁24の内周部58が幾分
変形し、かかる変形により上記応力が解放され、かくし
て軸受部材８の外輪52に比較的大きい応力が作用するこ
とが回避される。上述の結果、軸受部材６及び８の外輪
40及び52の変形が効果的に防止られ、ハブ手段４の振れ
が著しく低減される。また、環状凹部44及び56の存在に
より、軸受部材６及び８の装着時における変形も効果的
に防止される。In the spindle motor having such a configuration, the hub means 4 and the outer races 40 of the bearing members 6 and 8 are changed by the change in the ambient temperature.
And 52, the difference in thermal deformation is absorbed as follows. On one side of the bearing member 6, when stress is generated due to the difference in thermal deformation, the applied stress slightly deforms the inner peripheral portion 46 and / or the outer peripheral portion 48 of the bush member 26, and the stress is released by the deformation. Thus, a relatively large stress acting on the outer ring 40 of the bearing member 6 is avoided. Also, the other bearing member 8
On the side, when the stress is generated by the thermal deformation, the inner peripheral portion 58 of the end wall 24 of the hub body 18 is slightly deformed by the stress, and the stress is released by the deformation, and thus the outer ring 52 of the bearing member 8 is released. Is avoided. As a result of the above, the outer rings of the bearing members 6 and 8
Deformation of 40 and 52 is effectively prevented, and runout of hub means 4 is significantly reduced. In addition, the presence of the annular concave portions 44 and 56 effectively prevents deformation when the bearing members 6 and 8 are mounted.

尚、外輪40及び52の変形を効果的に防止するには、上
記環状凹部44及び56は軸受部材６及び８のボール42及び
54の配設部位近傍まで延びているのが好ましい。In order to effectively prevent deformation of the outer races 40 and 52, the annular recesses 44 and 56 are provided with the balls 42 of the bearing members 6 and 8, respectively.
It preferably extends to the vicinity of the 54 arrangement site.

以上、本発明に従うスピンドルモータの一具体例につ
いて説明したが、本発明はかかる具体例に限定されるも
のではなく、本発明の範囲を逸脱することなく種々の変
性乃至修正が可能である。As described above, one specific example of the spindle motor according to the present invention has been described. However, the present invention is not limited to such specific example, and various modifications or modifications can be made without departing from the scope of the present invention.

例えば、図示の具体例では、ブッシュ部材26の内周部
46及び外周部48の双方を幾分弾性変形可能に構成してい
るが、これらの一方、即ち内周部46又は外周部48を弾性
変形可能に構成してもよい。For example, in the illustrated example, the inner peripheral portion of the bush member 26
Although both the 46 and the outer peripheral portion 48 are configured to be somewhat elastically deformable, one of them, that is, the inner peripheral portion 46 or the outer peripheral portion 48 may be configured to be elastically deformable.

〔発明の効果〕〔The invention's effect〕

本発明のスピンドルモータによれば、ハブ手段の所定
部位に熱変形吸収用の環状凹部が設けられている故に、
温度が低下してハブ手段と軸受手段との間に熱変形量の
差が生じたとしても、かかる熱変形が上記環状凹部によ
り所要の通り吸収される。従って、比較的大きい熱応力
が軸受手段に作用することがなく、軸受手段の変形が防
止される。According to the spindle motor of the present invention, since the annular concave portion for absorbing thermal deformation is provided at a predetermined portion of the hub means,
Even if the temperature decreases and a difference in the amount of thermal deformation occurs between the hub means and the bearing means, such thermal deformation is absorbed by the annular recess as required. Therefore, relatively large thermal stress does not act on the bearing means, and deformation of the bearing means is prevented.

【図面の簡単な説明】[Brief description of the drawings]

第１図は、本発明に従うスピンドルモータの一具体例を
示す断面図。 ２……ブラケット ４……ハブ手段 ６及び８……軸受部材 18……ハブ本体 26……ブッシュ部材 40及び52……外輪 44及び56……環状凹部FIG. 1 is a sectional view showing a specific example of a spindle motor according to the present invention. 2 bracket 4 hub means 6 and 8 bearing member 18 hub body 26 bush members 40 and 52 outer rings 44 and 56 annular recess

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) H02K 5/04 H02K 5/16 H02K 5/173 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) H02K 5/04 H02K 5/16 H02K 5/173

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】ブラケットに立設された軸部材と、該軸部
材に一対の軸受手段を介して回転自在に支持され記録部
材が装着されるハブ手段と、該ハブ手段に装着されたロ
ータマグネットと、該ロータマグネットに対向して配設
されたステータとを具備するスピンドルモータにおい
て、該ハブ手段は、一端部内周に一方の軸受手段が直接
装着されるほぼ逆椀状のハブ本体と該ハブ本体の他端部
内周と他方の軸受手段との間に介在された環状のブッシ
ュ部材からなり、ハブ本体の一端部における前記一方の
軸受手段の近傍で当該軸受手段を支持する部位、及び前
記ブッシュ部材における前記他方の軸受手段の近傍にそ
れぞれ環状凹部が設けられ、かつ該各環状凹部が前記軸
受手段に対してその軸線方向寸法の半分より長い長さで
半径方向に対向していることを特徴とするスピンドルモ
ータ。1. A shaft member erected on a bracket, hub means rotatably supported on the shaft member via a pair of bearing means, and a recording member mounted thereon, and a rotor magnet mounted on the hub means. And a stator disposed opposite to the rotor magnet, wherein the hub means comprises a substantially inverted bowl-shaped hub body having one bearing means directly mounted on the inner circumference at one end, and the hub An annular bush member interposed between the inner periphery of the other end of the main body and the other bearing means, a portion for supporting the bearing means at one end of the hub body near the one bearing means, and the bush; Annular recesses are respectively provided in the vicinity of the other bearing means in the member, and each of the annular recesses faces the bearing means in a radial direction with a length longer than half of an axial dimension thereof. The spindle motor according to claim Rukoto.
JP2264613A 1990-10-01 1990-10-01 Spindle motor Expired - Fee Related JP2971115B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2264613A JP2971115B2 (en) 1990-10-01 1990-10-01 Spindle motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2264613A JP2971115B2 (en) 1990-10-01 1990-10-01 Spindle motor

Publications (2)

Publication Number Publication Date
JPH04161033A JPH04161033A (en) 1992-06-04
JP2971115B2 true JP2971115B2 (en) 1999-11-02

Family

ID=17405760

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2264613A Expired - Fee Related JP2971115B2 (en) 1990-10-01 1990-10-01 Spindle motor

Country Status (1)

Country Link
JP (1) JP2971115B2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3493442B2 (en) * 1994-06-07 2004-02-03 自動車電機工業株式会社 Small motor and its clearance adjustment method
JP4839897B2 (en) 2006-03-10 2011-12-21 日本電産株式会社 Rotor hub, motor and recording disk drive device
JP5072311B2 (en) * 2006-10-06 2012-11-14 アルファナテクノロジー株式会社 Hard disk drive motor and method of manufacturing hard disk drive motor
JP6550947B2 (en) 2015-06-11 2019-07-31 株式会社Ihi Rotating machine
CN110325752A (en) * 2017-03-30 2019-10-11 株式会社牧野铣床制作所 Main shaft device

Also Published As

Publication number Publication date
JPH04161033A (en) 1992-06-04

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