JPH0615492Y2 - Disk spindle motor - Google Patents
Disk spindle motorInfo
- Publication number
- JPH0615492Y2 JPH0615492Y2 JP1987089325U JP8932587U JPH0615492Y2 JP H0615492 Y2 JPH0615492 Y2 JP H0615492Y2 JP 1987089325 U JP1987089325 U JP 1987089325U JP 8932587 U JP8932587 U JP 8932587U JP H0615492 Y2 JPH0615492 Y2 JP H0615492Y2
- Authority
- JP
- Japan
- Prior art keywords
- flange portion
- disk
- stator
- bearing support
- hub
- 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 - Lifetime
Links
Landscapes
- Rotational Drive Of Disk (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Motor Or Generator Frames (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案はディスク用スピンドルモータに関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a spindle motor for a disk.
従来のディスク用スピンドルモータに於ては、その回転
軸及びディスク取付用ハブの倒れに対する対策として、
例えば、板バネやＯリング等をベアリングとブラケット
支承部の間に介装することによって行っていた。この側
圧方式は或る程度の効果を有するが、モータブラケット
自体のひずみによる倒れに対しては、あまり効果がなか
った。In the conventional disk spindle motor, as a measure against the fall of the rotation shaft and the disk mounting hub,
For example, a leaf spring, an O-ring or the like is interposed between the bearing and the bracket support portion. This lateral pressure method has some effect, but has little effect on the collapse due to the distortion of the motor bracket itself.
本考案は、上記問題点を解決し、回転軸の回転の理論的
中心位置がズレるいわゆる「軸の倒れ」に起因するオフ
トラック現象を解消したディスク用スピンドルモータを
提供することを目的としている。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a disk spindle motor in which the off-track phenomenon caused by the so-called "shaft tilt" in which the theoretical center position of rotation of the rotating shaft is displaced is eliminated.
本考案は、略平板状のフランジ部と該フランジ部に対し
直交した略円筒形の軸受支承部とを有するモータブラケ
ットと、前記軸受支承部にベアリングを介して回転自在
に枢支された回転軸と、該回転軸に回転され磁気ディス
クが搭載されるハブと、前記軸受支承部の外周面に固着
されたステータと、を備えたディスク用スピンドルモー
タであって、前記ステータの鉄心における磁気ヘッドを
通るディスクの中心線に対してほぼ直交する径方向の外
周部と前記フランジ部との間の軸方向間隙部に、前記フ
ランジ部に対し前記ステータを前記フランジ部から遠ざ
かる軸心方向に常時弾発的に押圧する弾発部材を設けた
ものである。The present invention provides a motor bracket having a substantially flat plate-shaped flange portion and a substantially cylindrical bearing support portion orthogonal to the flange portion, and a rotary shaft rotatably supported by the bearing support portion via a bearing. A spindle motor for a disk, comprising: a hub on which a magnetic disk is mounted that is rotated by the rotating shaft; and a stator fixed to an outer peripheral surface of the bearing support portion, wherein a magnetic head in an iron core of the stator is provided. In the axial gap between the outer peripheral portion in the radial direction substantially orthogonal to the center line of the passing disk and the flange portion, the stator is constantly repulsed in the axial direction away from the flange portion with respect to the flange portion. It is provided with an elastic member that presses the target.
弾発部材により、軸心方向から見て、回転軸の端部（つ
まり、ディスク側の端部）を磁気ヘッドを通る中心線に
対してほぼ直交する方向に傾倒させることができる。The elastic member makes it possible to tilt the end of the rotary shaft (that is, the end on the disk side) in a direction substantially orthogonal to the center line passing through the magnetic head when viewed in the axial direction.
本考案の実施例を図面に基づいて詳説する。 An embodiment of the present invention will be described in detail with reference to the drawings.
第１図と第２図に於て、１はアルミダイカスト製のモー
タブラケットであり、略円筒形の軸受支承部２と、略平
板状のフランジ部３と、を有している。上記軸受支承部
２の内周面４には、一対のベアリング５，６が嵌合保持
され、該ベアリング５，６を介して、中心に回転軸７が
回動自在に枢支されている。回転軸７の一端にはアルミ
ダイカスト製のハブ８が固着され、このハブ８に仮想線
で示す磁気記録用ディスク９…が搭載される。回転軸７
の他端には、ロータ10が固着されており、このロータ10
は、浅皿状のロータホルダ11と該ロータホルダ11の外周
縁12の内面に配設されたマグネット13と、を有してい
る。14は該マグネット13の内径側に近接対向して配置さ
れたステータであり、上記軸受支承部２の外周面15に固
着される。図例では、モータブラケット１のフランジ部
３は軸受支承部２の軸心方向における中間部において一
体状に形成されており、上記ロータ10及びステータ14
は、上記フランジ部３に対し、上記ハブ８と反対側に設
けられる。In FIGS. 1 and 2, reference numeral 1 denotes a motor bracket made of aluminum die casting, which has a substantially cylindrical bearing support portion 2 and a substantially flat plate-shaped flange portion 3. A pair of bearings 5 and 6 are fitted and held on the inner peripheral surface 4 of the bearing support portion 2, and a rotary shaft 7 is rotatably supported about the center of the bearings 5 and 6 via the bearings 5 and 6. A hub 8 made of aluminum die casting is fixed to one end of the rotary shaft 7, and magnetic recording disks 9 ... Shown by phantom lines are mounted on the hub 8. Rotating shaft 7
The rotor 10 is fixedly attached to the other end of the rotor 10.
Has a shallow dish-shaped rotor holder 11 and a magnet 13 arranged on the inner surface of the outer peripheral edge 12 of the rotor holder 11. Reference numeral 14 denotes a stator which is arranged close to and facing the inner diameter side of the magnet 13, and is fixed to the outer peripheral surface 15 of the bearing support portion 2. In the illustrated example, the flange portion 3 of the motor bracket 1 is integrally formed at an intermediate portion in the axial direction of the bearing support portion 2, and the rotor 10 and the stator 14 are
Is provided on the side opposite to the hub 8 with respect to the flange portion 3.
しかして、ステータ14の鉄心21における磁気ヘッド17を
通るディスク９の中心線Ｍに対してほぼ直交する径方向
の外周部30と、モータブラケット１のフランジ部３との
間の軸心方向間隙部16に、弾発部材18を設ける。Thus, the axial gap between the outer peripheral portion 30 in the radial direction substantially orthogonal to the center line M of the disk 9 passing through the magnetic head 17 in the iron core 21 of the stator 14 and the flange portion 3 of the motor bracket 1. An elastic member 18 is provided at 16.
この弾発部材18はフランジ部３に対しステータ14をフラ
ンジ部３から遠ざかる軸心方向に常時弾発的に押圧す
る。上記弾発部材18はモータブラケット１のフランジ部
３における裏面19に接着剤等によって固着され、その先
端20はステータ14の鉄心21の表面22に係止している。具
体的には、弾発部材18はゴム等の弾性材料からなり、第
３図に示すように、略円筒状の本体部の先端20に係止小
突起23を一体形成したものであり、該小突起23を鉄心21
の表面22に付設した係止凹部24に嵌込んで鉄心表面22に
おける押圧部と弾発部材18との相互移動を防ぐ。弾発部
材18を上記所定部位に取付けるには、例えば、フランジ
部３に弾発部材18を固着した状態で行うが、このとき該
弾発部材18が所定量圧縮された状態となるようにステー
タ14を軸受支承部２における軸心方向の所定位置に嵌合
固着する。上記のように取付けられた弾発部材18によっ
て、ステータ14に対し強制的な軸心方向の押圧力を与え
ることにより、ステータ14は矢印Ｆ方向に押圧され、軸
受支承部２とベアリング６を夫々介して回転軸７の反ハ
ブ側が軸直角方向Ｒに押される結果、回転軸７のハブ８
側は矢印Ｂ方向の僅かな倒れを生じる。即ち、この倒れ
方向Ｂは、第２図に示すように、磁気ヘッド17の進退方
向Ａ（この場合、磁気ヘッド17を通るディスク９の中心
線Ｍ）に対してほぼ直交する直線Ｎに沿う。即ち、軸心
方向から見てこの中心線Ｍと中心線Ｎとがなす角度θは
約９０度である。The elastic member 18 constantly elastically presses the stator 14 against the flange portion 3 in the axial direction away from the flange portion 3. The elastic member 18 is fixed to the back surface 19 of the flange portion 3 of the motor bracket 1 with an adhesive or the like, and its tip 20 is locked to the surface 22 of the iron core 21 of the stator 14. Specifically, the elastic member 18 is made of an elastic material such as rubber, and as shown in FIG. 3, a small locking projection 23 is integrally formed on the tip 20 of the substantially cylindrical body. Small protrusion 23 to iron core 21
It is fitted into a locking recess 24 attached to the surface 22 of the iron core 22 to prevent mutual movement between the pressing portion and the elastic member 18 on the iron core surface 22. The elastic member 18 is attached to the predetermined portion, for example, in a state where the elastic member 18 is fixed to the flange portion 3. At this time, the stator is set so that the elastic member 18 is compressed by a predetermined amount. The bearing 14 is fitted and fixed to a predetermined position in the axial direction of the bearing support 2. The resilient member 18 attached as described above applies a forced axial force to the stator 14 so that the stator 14 is pressed in the direction of arrow F, and the bearing support portion 2 and the bearing 6 are respectively pressed. As a result, the non-hub side of the rotating shaft 7 is pushed in the direction R perpendicular to the shaft, and as a result, the hub 8 of the rotating shaft 7
The side slightly tilts in the direction of arrow B. That is, as shown in FIG. 2, the tilt direction B is along a straight line N that is substantially orthogonal to the advancing / retreating direction A of the magnetic head 17 (in this case, the center line M of the disk 9 passing through the magnetic head 17). That is, the angle θ formed by the center line M and the center line N when viewed from the axial direction is about 90 degrees.
回転軸７のハブ８側に生じる矢印Ｂ方向の倒れと共に、
ハブ８は同時に仮想線で示すように同方向に傾斜し、磁
気ディスク９…は矢印Ｂ方向に僅かに傾斜した理論回転
中心Ｃ廻りに回転する。しかし、磁気ディスク９…がこ
のように傾斜した状態で回転した場合、ディスク９…に
描かれたトラックと、これを読取る磁気ヘッド17との径
方向の相対的位置ずれによるオフトラックは量の最も少
ないのがθ≒90゜の場合である。With the tilt in the direction of arrow B that occurs on the hub 8 side of the rotating shaft 7,
At the same time, the hub 8 tilts in the same direction as shown by the phantom line, and the magnetic disks 9 rotate about the theoretical rotation center C slightly tilted in the arrow B direction. However, when the magnetic disks 9 ... Rotate in such a tilted state, the off-track due to the relative displacement in the radial direction between the track drawn on the disk 9 and the magnetic head 17 for reading the disk is the largest. The small number is when θ ≈ 90 °.
実際のスピンドルモータに於ては、モータブラケットの
歪みのため、回転軸７ひいてはハブ８は軸心Ｏに対し種
々異なる方向に傾斜しており、これが原因でオフトラッ
クを生じていた。従って、上記のように回転軸７及びハ
ブ８を強制的に一定方向に傾斜させることにより、ブラ
ケット１の上記歪みに基づくオフトラック等の現象を解
消すべくしたものである。In an actual spindle motor, due to distortion of the motor bracket, the rotary shaft 7 and thus the hub 8 are inclined in different directions with respect to the axis O, which causes off-track. Therefore, by forcibly inclining the rotary shaft 7 and the hub 8 in a certain direction as described above, the phenomenon such as off-track due to the above distortion of the bracket 1 is eliminated.
上記実施例の場合と異なり、弾発部材18については、第
４図と第５図に示すように、例えば略Ｚ字形の、バネ状
の弾性体を用いても差し支えない。なお、係止部25は鉄
心表面22に付設した係止凹部（図示せず）に係合され
る。Unlike the case of the above embodiment, the resilient member 18 may be a spring-like elastic body having, for example, a substantially Z shape, as shown in FIGS. 4 and 5. The locking portion 25 is engaged with a locking recess (not shown) attached to the iron core surface 22.
他の実施例について説明すると、第６図と第７図に示す
ように、ハブ８の内部に磁気シールド材26を嵌挿し、さ
らにその内側にマグネット13を嵌着したスピンドルモー
タに適用しても差し支えない。この場合、モータブラケ
ット１のフランジ部３は、軸受支承部２とその反ハブ８
側の端部において一体状とされており、また、ステータ
14はフランジ部３に対しハブ８と同じ側であって、マグ
ネット13の内周側に近接配置される。弾発部材18によっ
て軸心方向に強制的な押圧力を与えることにより、ステ
ータ14の押圧されている部分は矢印Ｆ方向に押圧され、
軸受支承部２とベアリング５を夫々介して回転軸７のハ
ブ側に矢印Ｂ方向の倒れを生じさせる。Another embodiment will be explained. As shown in FIGS. 6 and 7, the present invention can be applied to a spindle motor in which the magnetic shield material 26 is fitted inside the hub 8 and the magnet 13 is fitted inside thereof. It doesn't matter. In this case, the flange portion 3 of the motor bracket 1 includes the bearing support portion 2 and the opposite hub 8 thereof.
Is integrated at the end on the side of the
Reference numeral 14 is on the same side as the hub 8 with respect to the flange portion 3 and is arranged close to the inner peripheral side of the magnet 13. By applying a pressing force in the axial direction by the elastic member 18, the pressed portion of the stator 14 is pressed in the arrow F direction,
A tilt in the direction of arrow B is caused on the hub side of the rotary shaft 7 via the bearing support portion 2 and the bearing 5, respectively.
なお、本考案は上述の実施例に限らず、本考案の要旨を
逸脱しない範囲で設計変更自由であり、例えば、弾発部
材18を、上述の設置範囲内で複数個設けるも自由であ
る。The present invention is not limited to the above-described embodiments, and the design can be freely changed without departing from the scope of the present invention. For example, a plurality of elastic members 18 can be provided within the above-mentioned installation range.
本考案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.
弾発部材18により、軸心方向から見て、回転軸７の端部
（つまり、ディスク９側の端部）を磁気ヘッド17を通る
中心線Ｍに対してほぼ直交する方向に傾倒させることが
できる。従って、ハブ８及びこれに搭載したディスク９
…の倒れ方向を、磁気ヘッド17のリードライトに影響を
与えない方向に常に向くように保持することが可能とな
るので、オフトラック等の磁気ヘッド17の読み取り誤差
の原因となる不具合な現象を防止出来、高精密回転を実
現する。The elastic member 18 can tilt the end portion of the rotary shaft 7 (that is, the end portion on the disk 9 side) in a direction substantially orthogonal to the center line M passing through the magnetic head 17 when viewed from the axial direction. it can. Therefore, the hub 8 and the disk 9 mounted on the hub 8
It is possible to maintain the tilt direction of ... so that it will always be oriented in a direction that does not affect the read / write of the magnetic head 17. Therefore, a troublesome phenomenon that causes a read error of the magnetic head 17 such as off-track may occur. It can be prevented and realizes high precision rotation.
第１図は本考案の一実施例を示す断面正面図、第２図は
第１図のII−II線断面矢視図、第３図は弾発部材の拡大
斜視図、第４図は他の実施例を示す要部断面正面図、第
５図は弾発部材の他の具体例を示す斜視図、第６図はさ
らに他の実施例を示す断面正面図、第７図は第６図の平
面図である。 １……モータブラケット、５……ベアリング、６……ベ
アリング、７……回転軸、14ステータ、17……磁気ヘッ
ド、18……弾発部材、Ｏ……軸心。1 is a sectional front view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, FIG. 3 is an enlarged perspective view of an elastic member, and FIG. FIG. 5 is a perspective view showing another specific example of the elastic member, FIG. 6 is a sectional front view showing yet another embodiment, and FIG. 7 is FIG. FIG. 1 ... Motor bracket, 5 ... Bearing, 6 ... Bearing, 7 ... Rotating shaft, 14 Stator, 17 ... Magnetic head, 18 ... Resilient member, O ... Shaft center.
Claims (1)
部（３）に対し直交した略円筒形の軸受支承部（２）と
を有するモータブラケット（１）と、前記軸受支承部
（２）にベアリング（５）（６）を介して回転自在に枢
支された回転軸（７）と、該回転軸（７）に固着され磁
気ディスク（９）…が搭載されるハブ（８）と、前記軸
受支承部（２）の外周面(15)に固着されたステータ(14)
と、を備えたディスク用スピンドルモータであって、 前記ステータ(14)の鉄心(21)における磁気ヘッド(17)を
通るディスク（９）の中心線（Ｍ）に対してほぼ直交す
る径方向の外周部(30)と前記フランジ部（３）との間の
軸心方向間隙部(16)に、前記フランジ部（３）に対し前
記ステータ(14)を前記フランジ部（３）から遠ざかる軸
心方向に常時弾発的に押圧する弾発部材(18)を設けたこ
とを特徴とするディスク用スピンドルモータ。1. A motor bracket (1) having a substantially flat plate-shaped flange portion (3) and a substantially cylindrical bearing support portion (2) orthogonal to the flange portion (3), and the bearing support portion ( A rotary shaft (7) rotatably supported on the rotary shaft (2) via bearings (5) and (6), and a hub (8) on which magnetic disks (9) ... And a stator (14) fixed to the outer peripheral surface (15) of the bearing support portion (2).
And a disk spindle motor including: a radial direction substantially orthogonal to a center line (M) of the disk (9) passing through the magnetic head (17) in the iron core (21) of the stator (14). An axial center that separates the stator (14) from the flange portion (3) with respect to the flange portion (3) in the axial gap (16) between the outer peripheral portion (30) and the flange portion (3). A spindle motor for a disk, which is provided with an elastic member (18) that constantly elastically presses in a direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987089325U JPH0615492Y2 (en) | 1987-06-09 | 1987-06-09 | Disk spindle motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987089325U JPH0615492Y2 (en) | 1987-06-09 | 1987-06-09 | Disk spindle motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63198356U JPS63198356U (en) | 1988-12-21 |
| JPH0615492Y2 true JPH0615492Y2 (en) | 1994-04-20 |
Family
ID=30948216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987089325U Expired - Lifetime JPH0615492Y2 (en) | 1987-06-09 | 1987-06-09 | Disk spindle motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0615492Y2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6358861U (en) * | 1986-09-30 | 1988-04-19 |
-
1987
- 1987-06-09 JP JP1987089325U patent/JPH0615492Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63198356U (en) | 1988-12-21 |
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