JP2832388B2 - Spindle motor - Google Patents
Spindle motorInfo
- Publication number
- JP2832388B2 JP2832388B2 JP11438590A JP11438590A JP2832388B2 JP 2832388 B2 JP2832388 B2 JP 2832388B2 JP 11438590 A JP11438590 A JP 11438590A JP 11438590 A JP11438590 A JP 11438590A JP 2832388 B2 JP2832388 B2 JP 2832388B2
- Authority
- JP
- Japan
- Prior art keywords
- yoke
- hub
- hub member
- rotor magnet
- yoke member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 ［技術分野］ 本発明は、スピンドルモータ、更に詳しくはハブ部材
とヨーク部材とが熱膨張係数の異なる材料から形成され
ているスピンドルモータに関する。Description: TECHNICAL FIELD The present invention relates to a spindle motor, and more particularly, to a spindle motor in which a hub member and a yoke member are formed of materials having different coefficients of thermal expansion.
［従来技術及びその欠点］ 一般に、磁気ディスクの如き記録部材を回転駆動する
ためのスピンドルモータは、取付ブラケットと、この取
付ブラケットに対して相対的に回転自在であるハブ部材
と、ハブ部材の内側に配設されたロータマグネットと、
ロータマグネットの外側に配設されたヨーク部材と、ロ
ータマグネットに対向してその内側に配設されたステー
タと、を備えており、記録部材はハブ部材の外周面に装
着される。この種のスピンドルモータでは、ハブ部材は
アルミニウム又はアルミ合金から形成され、またヨーク
部材は鉄から形成され、ハブ部材とヨーク部材の熱膨張
係数が異なっている。[Prior Art and its Defects] Generally, a spindle motor for rotating a recording member such as a magnetic disk includes a mounting bracket, a hub member rotatable relative to the mounting bracket, and an inner side of the hub member. A rotor magnet arranged in
A yoke member is provided outside the rotor magnet, and a stator is provided inside the rotor magnet so as to face the rotor magnet. The recording member is mounted on the outer peripheral surface of the hub member. In this type of spindle motor, the hub member is formed of aluminum or an aluminum alloy, and the yoke member is formed of iron, and the hub member and the yoke member have different thermal expansion coefficients.
このハブ部材とヨーク部材を実質上全長に渡って焼ば
め等の手段により固定すると、次の通りの問題が生じ
る。即ち、ハブ部材とヨーク部材の熱膨張係数が異なる
故に、雰囲気温度が上昇又は下降すると、ハブ部材とヨ
ーク部材の膨張又は収縮の程度に差が生じ、かかる差が
大きくなると記録部材に変形が生じ、回転時のうねり、
騒音等の原因になる。If the hub member and the yoke member are fixed over substantially the entire length by means such as shrink fitting, the following problem occurs. That is, since the hub member and the yoke member have different thermal expansion coefficients, when the ambient temperature rises or falls, a difference occurs in the degree of expansion or contraction between the hub member and the yoke member, and when the difference increases, the recording member deforms. Swelling during rotation,
May cause noise.
［発明の目的］ 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、比較的簡単な構成でもって、ハブ部材とヨー
ク部材の熱膨張係数の差に起因する熱変形を吸収するこ
とができる、改良されたスピンドルモータを提供するこ
とである。[Object of the Invention] The present invention has been made in view of the above facts, and has a main object of absorbing a thermal deformation caused by a difference in thermal expansion coefficient between a hub member and a yoke member with a relatively simple configuration. To provide an improved spindle motor.
［発明の概要］ 本発明によれば、取付ブラケットと、該取付ブラケッ
トに対して相対的に回転自在であるハブ部材と、該ハブ
部材の内側に配設されたロータマグネットと、該ロータ
マグネットの外側に配設されたヨーク部材と、該ロータ
マグネットに対向してその内側に配設されたステータ
と、を具備し、該ハブ部材と該ヨーク部材が熱膨張係数
の異なる材料から形成されているスピンドルモータにお
いて、 該ヨーク部材の一端部は該ハブ部材の一端部に固定さ
れ、その他端部は該ハブ部材の他端部に固定されたブッ
シュ部材に形成されている環状凹部に受入れられ、該ヨ
ーク部材と該ハブ部材の間には、該ヨーク部材の実質上
全長に渡って間隙が存在しており、 また、該環状凹部には、該ヨーク部材の他端部を半径
方向に弾性的に偏倚せしめるための第１の偏倚手段と、
該ヨーク部材の他端部をその一端側に向けて軸方向に弾
性的に偏倚せしめるための第２の偏倚手段とが配設され
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。SUMMARY OF THE INVENTION According to the present invention, a mounting bracket, a hub member rotatable relative to the mounting bracket, a rotor magnet disposed inside the hub member, An outer yoke member and a stator disposed inside the rotor magnet so as to face the rotor magnet, wherein the hub member and the yoke member are formed of materials having different thermal expansion coefficients. In the spindle motor, one end of the yoke member is fixed to one end of the hub member, and the other end is received in an annular recess formed in a bush member fixed to the other end of the hub member. A gap exists between the yoke member and the hub member over substantially the entire length of the yoke member, and the annular concave portion has the other end of the yoke member elastically radially. Bias A first biasing means for Mel,
A second biasing means for resiliently biasing the other end of the yoke member in the axial direction toward the one end thereof is provided.
［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取付ブラ
ケット２、軸部材４及びハブ部材６を備えている。取付
ブラケット２は略円板形状であり、その中央部にはボス
部2aが設けられている。この取付ブラケット２は駆動装
置のフレーム（図示せず）に装着される。In FIG. 1, the illustrated spindle motor includes a mounting bracket 2, a shaft member 4, and a hub member 6. The mounting bracket 2 is substantially disc-shaped, and has a boss 2a at the center. The mounting bracket 2 is mounted on a frame (not shown) of the driving device.
軸部材４は取付ブラケット２に固定され、この軸部材
４にハブ部材６が回転自在に装着されている。具体例で
は、軸部材４の下端部が圧入等の手段により取付ブラケ
ット２のボス部2aに固定されている。ハブ部材６は略円
筒形であり、その一端部（上端部）の内径は他の部分の
内径よりも小さくなっている。このハブ部材６の内周面
には所定の間隔を置いてヨーク部材８が配設され、この
ヨーク部材８の長手方向略中央部内周面に環状のロータ
マグネット10が取付けられている。ハブ部材６とヨーク
部材８の固定様式については、後に詳述する。The shaft member 4 is fixed to the mounting bracket 2, and a hub member 6 is rotatably mounted on the shaft member 4. In a specific example, the lower end of the shaft member 4 is fixed to the boss 2a of the mounting bracket 2 by means such as press fitting. The hub member 6 has a substantially cylindrical shape, and the inside diameter of one end (upper end) is smaller than the inside diameter of the other part. A yoke member 8 is arranged at a predetermined interval on the inner peripheral surface of the hub member 6, and an annular rotor magnet 10 is attached to the inner peripheral surface of the yoke member 8 at a substantially central portion in the longitudinal direction. The manner of fixing the hub member 6 and the yoke member 8 will be described later in detail.
このハブ部材６は一対の軸受部材12及び14を介して軸
部材４に回転自在に支持されている。具体例では、図示
する通り、ハブ部材６は、一端部（かかる一端部は肉厚
部16となっている）が磁性のスリーブ部材17を介して軸
受部材12に回転自在に支持され、他端部においてハブ部
材６の内周面に装着されたブッシュ部材18を介して他方
の軸受部材14に回転自在に支持されている。軸受部材12
及び14の外側には磁性流体シール機構20及び22が配設さ
れている。片方の磁性流体シール機構20は軸受部材12の
外側にてハブ部材６の一端部に固定された環状スリーブ
部材24を含み、このスリーブ部材に環状磁石26及び一対
のポールピース28が装着され、ポールピース28と軸部材
４に固定された環状部材24の間に磁性流体が充填されて
いる。また、他方の磁性流体シール機構22はブッシュ部
材18に装着された環状磁石32及び一対のポールピース34
を有しポールピース34と軸部材４に固定された環状部材
30との間に磁性流体が充填されている。磁性流体シール
機構20のブッシュ部材24と軸受部材12の内輪36との間に
はプレート状ばね部材38が介在され、ばね部材38は軸受
部材12及び14に予圧を付与する。The hub member 6 is rotatably supported by the shaft member 4 via a pair of bearing members 12 and 14. In a specific example, as shown, the hub member 6 has one end (the one end is a thick portion 16) rotatably supported by the bearing member 12 via a magnetic sleeve member 17, and the other end. The portion is rotatably supported by the other bearing member 14 via a bush member 18 mounted on the inner peripheral surface of the hub member 6. Bearing member 12
The magnetic fluid sealing mechanisms 20 and 22 are provided outside the and. One magnetic fluid sealing mechanism 20 includes an annular sleeve member 24 fixed to one end of the hub member 6 outside the bearing member 12, and an annular magnet 26 and a pair of pole pieces 28 are mounted on the sleeve member. A magnetic fluid is filled between the piece 28 and the annular member 24 fixed to the shaft member 4. Further, the other magnetic fluid seal mechanism 22 includes an annular magnet 32 mounted on the bush member 18 and a pair of pole pieces 34.
And an annular member fixed to the pole piece 34 and the shaft member 4
The magnetic fluid is filled between the gaps 30 and 30. A plate-shaped spring member 38 is interposed between the bush member 24 of the magnetic fluid seal mechanism 20 and the inner ring 36 of the bearing member 12, and the spring member 38 applies a preload to the bearing members 12 and 14.
ロータマグネット10の内側にはステータ40が配設さ
れ、このステータ40は軸部材４の中間部（一対の軸受部
材12及び14間の部位）に固定されている。ステータ40と
軸部材４の環状突部42の間には、ハブ部材６の回転を制
御するための回路基板44が配設されている。A stator 40 is disposed inside the rotor magnet 10, and the stator 40 is fixed to an intermediate portion of the shaft member 4 (a portion between the pair of bearing members 12 and 14). A circuit board 44 for controlling the rotation of the hub member 6 is provided between the stator 40 and the annular projection 42 of the shaft member 4.
かくの通りのスピンドルモータにおいては、第１図に
一点鎖線で示す如く、ハブ部材６の外周面に複数枚の磁
気ディスクの如き記録ディスク46がスペーサ部材48を介
して積層状態に装着され、最下位の記録ディスク46はハ
ブ部材６のフランジ部50に載置される。そして、取付ブ
ラケット２、軸部材４及びステータ40に対して、ハブ部
材６（これと一体にヨーク部材８及びロータマグネット
10）及び記録ディスク46が所定方向に回転駆動される。In the spindle motor as described above, as shown by a dashed line in FIG. 1, a plurality of recording disks 46 such as magnetic disks are mounted on the outer peripheral surface of the hub member 6 via a spacer member 48 in a stacked state. The lower recording disk 46 is mounted on the flange portion 50 of the hub member 6. Then, the hub member 6 (the yoke member 8 and the rotor magnet integrally with the hub member 6) are attached to the mounting bracket 2, the shaft member 4 and the stator 40.
10) and the recording disk 46 is driven to rotate in a predetermined direction.
次に、第１図と共に第２図を参照して、ハブ部材６と
ヨーク部材８の固定様式について説明する。具体例で
は、ハブ部材６はアルミニウム又はアルミ合金から形成
され、ヨーク部材８は鉄から形成され、ハブ部材６の熱
膨張係数がヨーク部材８の熱膨張係数よりも大きい。一
般に、雰囲気温度が上昇又は下降すると両者の熱膨張又
は熱収縮の差に起因して熱変形が発生するが、具体例で
は、上記熱変形が所要の通り吸収される構成となってい
る。尚、ブッシュ部材18はハブ部材６と同様の材料、即
ちアルミニウム又はアルミ合金から形成される。即ち、
ハブ部材６とヨーク部材８は、それらの一端部が焼ばめ
の如き手段によって固定され、かかるヨーク部材８の実
質上全長に渡って全周囲に間隙が設けられている。図示
の例では、ハブ部材６の一端部内周縁部には内方に突出
する環状突部51が設けられており、かかる環状突部51の
外周面にヨーク部材８の一端部が焼ばめにより固定され
ている。焼ばめに代えて、圧入又は接着剤等の手段によ
り固定するようにしてもよい。Next, the manner of fixing the hub member 6 and the yoke member 8 will be described with reference to FIG. 2 together with FIG. In a specific example, the hub member 6 is formed from aluminum or an aluminum alloy, the yoke member 8 is formed from iron, and the coefficient of thermal expansion of the hub member 6 is larger than the coefficient of thermal expansion of the yoke member 8. Generally, when the ambient temperature rises or falls, thermal deformation occurs due to the difference in thermal expansion or contraction between the two, but in a specific example, the thermal deformation is absorbed as required. The bush member 18 is formed of the same material as the hub member 6, that is, aluminum or an aluminum alloy. That is,
The hub member 6 and the yoke member 8 are fixed at one end by means such as shrink fitting, and a gap is provided around the entire length of the yoke member 8 over substantially the entire length thereof. In the example shown in the figure, an annular protrusion 51 projecting inward is provided at the inner peripheral edge of one end of the hub member 6, and one end of the yoke member 8 is shrink-fitted on the outer peripheral surface of the annular protrusion 51. Fixed. Instead of shrink fitting, it may be fixed by means such as press-fitting or an adhesive.
また、ブッシュ部材18の内面には環状凹部52が形成さ
れており、かかる環状凹部52にヨーク部材８の他端部が
受入れられている。環状凹部52の幅はヨーク部材８の厚
さよりも大きく、また環状凹部52はヨーク部材８の他端
を越えて延びており、従ってヨーク部材８の他端部は上
記環状凹部52に受入れられた状態にて半径方向及び軸方
向に変位可能である。An annular recess 52 is formed on the inner surface of the bush member 18, and the other end of the yoke member 8 is received in the annular recess 52. The width of the annular recess 52 is greater than the thickness of the yoke member 8, and the annular recess 52 extends beyond the other end of the yoke member 8, so that the other end of the yoke member 8 is received in the annular recess 52. In this state, it can be displaced in the radial and axial directions.
具体例では、環状凹部52の片側周面を規定する面に矩
形状の環状受溝53が形成され、この環状受溝53に、例え
ば合成ゴムから形成することができるＯ−リング54（第
１の偏倚手段を構成する）が装着されている。Ｏ−リン
グ54はヨーク部材８の内周面に作用して半径方向外方に
偏倚せしめ、かかる偏倚力によってヨーク部材８の外周
面が環状凹部52の他側周面を規定する面に弾性的に押圧
される。また、環状凹部52の底部には断面略Ｕ字状の皿
ばねの如き弾性リング部材56（第２の偏倚手段を構成す
る）が配設されている。このリング部材56はヨーク部材
８の他端面（下端面）に作用して軸線方向上方に偏倚せ
しめる。従って、容易に理解される如く、ヨーク部材８
の他端部はＯ−リング54及びリング部材56によって環状
凹部52内に確実に支持される。In a specific example, a rectangular annular receiving groove 53 is formed on a surface that defines one peripheral surface of the annular concave portion 52, and an O-ring 54 (the first ring) that can be formed of, for example, synthetic rubber is formed in the annular receiving groove 53. (Which constitutes the biasing means). The O-ring 54 acts on the inner peripheral surface of the yoke member 8 to be deflected radially outward, and the biasing force causes the outer peripheral surface of the yoke member 8 to be elastically deformed on the surface defining the other peripheral surface of the annular recess 52. Is pressed. An elastic ring member 56 (constituting a second biasing means) such as a disc spring having a substantially U-shaped cross section is provided at the bottom of the annular concave portion 52. The ring member 56 acts on the other end surface (lower end surface) of the yoke member 8 to be deflected upward in the axial direction. Therefore, as will be easily understood, the yoke member 8
Is securely supported in the annular recess 52 by the O-ring 54 and the ring member 56.
かくの通りのスピンドルモータは、次の通りの特徴を
有する。The spindle motor as described above has the following features.
ヨーク部材８の一端部はハブ部材６の一端部に固定さ
れ、その他端部はブッシュ部材18に形成された環状凹部
52に半径方向及び軸方向に移動可能に受入れられてお
り、それ故に、雰囲気温度の変化によってハブ部材６と
ヨーク部材８が相対的に伸縮してもヨーク部材８の他端
部が環状凹部52内を変位するのみであり、従ってハブ部
材６の異常変形が防止され、記録ディスク46のうねりの
発生等が防止される。また、ハブ部材６の内周面とヨー
ク部材８の外周面との間にはヨーク部材の実質上全長に
渡ってその全周に間隙が存在しそれ故に雰囲気温度の変
化によってハブ部材６とヨーク部材８が相対的に伸縮し
てもハブ部材６に悪影響を与えることはなく、これによ
っても記録ディスク46のうねりの発生等が防止される。One end of the yoke member 8 is fixed to one end of the hub member 6, and the other end is an annular recess formed in the bush member 18.
The other end of the yoke member 8 is received in the annular recess 52 even if the hub member 6 and the yoke member 8 relatively expand and contract due to a change in the ambient temperature. Therefore, the hub member 6 is prevented from being abnormally deformed, and the undulation of the recording disk 46 is prevented. Further, a gap exists between the inner peripheral surface of the hub member 6 and the outer peripheral surface of the yoke member 8 over substantially the entire length of the yoke member. Even if the member 8 relatively expands and contracts, the hub member 6 is not adversely affected, and this also prevents the recording disk 46 from undulating.
更に、Ｏ−リング54がヨーク部材８の他端部を半径方
向に弾性的に偏倚せしめ、またリング部材56がヨーク部
材８の他端部を軸線方向に弾性的に偏倚せしめ、それ故
に、ヨーク部材８の他端部はＯ−リング54及びリング部
材56によって確実に支持される。Further, the O-ring 54 resiliently biases the other end of the yoke member 8 in the radial direction, and the ring member 56 resiliently biases the other end of the yoke member 8 in the axial direction. The other end of the member 8 is securely supported by the O-ring 54 and the ring member 56.
以上、本発明に従うスピンドルモータの具体例につい
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形
乃至修正が可能である。As described above, the specific examples of the spindle motor according to the present invention have been described. However, the present invention is not limited to such specific examples, and various modifications and corrections can be made without departing from the scope of the present invention.
例えば、図示の具体例では、ヨーク部材８の他端部内
側にＯ−リング54を配設してこの他端部を半径方向外方
に弾性的に偏倚せしめているが、これとは反対に、ヨー
ク部材８の他端部外側にＯ−リング54を配設してこの他
端部を半径方向内方に弾性的に偏倚せしめるようにして
もよい。For example, in the illustrated embodiment, the O-ring 54 is disposed inside the other end of the yoke member 8 and the other end is elastically biased outward in the radial direction. Alternatively, an O-ring 54 may be provided outside the other end of the yoke member 8, and the other end may be elastically biased radially inward.
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。 第２図は、第１図のスピンドルモータの一部を拡大して
示す断面図。 ２……取付ブラケット ４……軸部材 ６……ハブ部材 ８……ヨーク部材 10……ロータマグネット 18……ブッシュ部材 40……ステータ 46……記録ディスク 52……環状凹部 54……Ｏ−リング 56……弾性リング部材FIG. 1 is a sectional view showing a specific example of a spindle motor according to the present invention. FIG. 2 is an enlarged sectional view showing a part of the spindle motor shown in FIG. 1; 2 Mounting bracket 4 Shaft member 6 Hub member 8 Yoke member 10 Rotor magnet 18 Bush member 40 Stator 46 Recording disk 52 Annular recess 54 O-ring 56 …… Elastic ring member
Claims (1)
して相対的に回転自在であるハブ部材と、該ハブ部材の
内側に配設されたロータマグネットと、該ロータマグネ
ットの外側に配設されたヨーク部材と、該ロータマグネ
ットに対向してその内側に配設されたステータと、を具
備し、該ハブ部材と該ヨーク部材が熱膨張係数の異なる
材料から形成されているスピンドルモータにおいて、 該ヨーク部材の一端部は該ハブ部材の一端部に固定さ
れ、その他端部は該ハブ部材の他端部に固定されたブッ
シュ部材に形成されている環状凹部に受入れられ、該ヨ
ーク部材と該ハブ部材の間には、該ヨーク部材の実質上
全長に渡って間隙が存在しており、 また、該環状凹部には、該ヨーク部材の他端部を半径方
向に弾性的に偏倚せしめるための第１の偏倚手段と、該
ヨーク部材の他端部をその一端側に向けて軸方向に弾性
的に偏倚せしめるための第２の偏倚手段とが配設されて
いる、 ことを特徴とするスピンドルモータ。A mounting bracket; a hub member rotatable relative to the mounting bracket; a rotor magnet disposed inside the hub member; and a rotor magnet disposed outside the rotor magnet. A spindle motor, comprising: a yoke member; and a stator disposed inside the rotor magnet so as to face the rotor magnet, wherein the hub member and the yoke member are formed of materials having different thermal expansion coefficients. One end of the member is fixed to one end of the hub member, and the other end is received in an annular recess formed in a bush member fixed to the other end of the hub member. And a gap extending over substantially the entire length of the yoke member, and a first portion for elastically biasing the other end of the yoke member radially in the annular concave portion. of Spindle motor for a 倚 means, second biasing means for allowing resiliently biased axially toward the other end portion of said yoke member at one end is provided, characterized in that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11438590A JP2832388B2 (en) | 1990-04-28 | 1990-04-28 | Spindle motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11438590A JP2832388B2 (en) | 1990-04-28 | 1990-04-28 | Spindle motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0412648A JPH0412648A (en) | 1992-01-17 |
| JP2832388B2 true JP2832388B2 (en) | 1998-12-09 |
Family
ID=14636350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11438590A Expired - Fee Related JP2832388B2 (en) | 1990-04-28 | 1990-04-28 | Spindle motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2832388B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2734873B2 (en) * | 1992-04-20 | 1998-04-02 | 日本電気株式会社 | Spindle motor for magnetic disk drive |
| US9062700B2 (en) | 2012-06-29 | 2015-06-23 | Saint-Gobain Performance Plastics Rencol Limited | Tolerance ring with component engagement structures |
-
1990
- 1990-04-28 JP JP11438590A patent/JP2832388B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0412648A (en) | 1992-01-17 |
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