JPH0425621A - Support structure for low heat distortion bearing - Google Patents

Support structure for low heat distortion bearing

Info

Publication number
JPH0425621A
JPH0425621A JP12422790A JP12422790A JPH0425621A JP H0425621 A JPH0425621 A JP H0425621A JP 12422790 A JP12422790 A JP 12422790A JP 12422790 A JP12422790 A JP 12422790A JP H0425621 A JPH0425621 A JP H0425621A
Authority
JP
Japan
Prior art keywords
rolling bearing
bearing
support structure
slit
annular
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
Application number
JP12422790A
Other languages
Japanese (ja)
Other versions
JP2897782B2 (en
Inventor
Takahiro Imamura
孝浩 今村
Takaharu Ariga
敬治 有賀
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP12422790A priority Critical patent/JP2897782B2/en
Publication of JPH0425621A publication Critical patent/JPH0425621A/en
Application granted granted Critical
Publication of JP2897782B2 publication Critical patent/JP2897782B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PURPOSE:To eliminate lowering of oscillation characteristics and rotation accuracy so as to prevent a rotating member from being dislocated by change in temperature by providing an annular slit of double-cantilever type around a part to be engaged with the outer race of rolling bearing of the rotating member. CONSTITUTION:A spindle hub 1 serving as a rotating member is made of aluminium and supported on a fixed shaft 3 by a rolling bearing 2. An annular slit 9 coaxial with the rolling bearing 2 is arranged so that a thin part 1a may be formed on the outer circumference of a part engaging with the outer race 2a of the bearing 2, and the opening of the slit 9 is closed with an annular member 10. When temperature decreases, since the hub 1 made of aluminium has a larger thermal expansion coefficient than that of the rolling bearing made of steel, it shirinks remarkably, but at this time the thin part 1a is deformed to absorb the shrinking amount. Since the free end of thin part 1a is supported by the annular member 10 and the support structure is of double- cantilever type, the deformation results in a circular form with symmetry with respect to the center line L in the bearing width direction. Consequently, this structure provides less decrease in the rotation accuracty of the bearing 2.

Description

【発明の詳細な説明】 〔概 要〕 回転体を支持するころがり軸受が外輪回転型である軸受
支持構造の低熱歪構造に関し、温度変化による回転体の
偏心を防止することを目的とし、 回転体を回転自在に支持するころがり軸受が外輪回転型
である軸受支持構造において、回転体のころがり軸受(
2)を嵌合する部分に、該ころがり軸受と同心で且つ一
方が開口した環状スリットを設け、該環状スリットの開
口部を環状部材で塞ぐように構成する。さらに回転体の
ころがり軸受外輪と接触する部分をころがり軸受幅方向
の中心付近に限定するように構成する。
[Detailed Description of the Invention] [Summary] The present invention relates to a low thermal distortion structure of a bearing support structure in which a rolling bearing that supports a rotating body is an outer ring rotating type, and the purpose of this invention is to prevent eccentricity of the rotating body due to temperature changes. In a bearing support structure in which the rolling bearing that rotatably supports the rotating body is an outer ring rotating type, the rolling bearing of the rotating body (
2) is provided with an annular slit that is concentric with the rolling bearing and open at one end, and the opening of the annular slit is closed with an annular member. Further, the portion of the rotating body that contacts the outer ring of the rolling bearing is limited to the vicinity of the center in the width direction of the rolling bearing.

〔産業上の利用分野〕[Industrial application field]

本発明は、回転体を支持するころがり軸受が外輪回転型
である軸受支持構造の低熱歪構造に関する。
The present invention relates to a low thermal distortion structure of a bearing support structure in which a rolling bearing that supports a rotating body is an outer ring rotating type.

以下回転体として磁気ディスク装置の磁気ディスク媒体
を支持するスピンドルハブに例をとり説明する。磁気デ
ィスク媒体に磁気ヘッドにより情報を記録し、再生する
磁気ディスク装置では、環境温度の変化によりスピンド
ルハブの軸受支持構造が熱歪を生じスピンドルハブを偏
心させることがあり、情報再生時に磁気ヘッドがトラッ
クずれを生じ情報再生が困難になるという問題が生ずる
Hereinafter, a spindle hub that supports a magnetic disk medium of a magnetic disk device will be explained as an example of a rotating body. In magnetic disk drives that use magnetic heads to record and reproduce information on magnetic disk media, changes in environmental temperature can cause thermal strain in the bearing support structure of the spindle hub, causing the spindle hub to become eccentric. A problem arises in that track deviation occurs and information reproduction becomes difficult.

このため磁気ディスク媒体を支持するスピンドルハブを
環境温度の変化があっても偏心しない様にするこ止が重
要である。
Therefore, it is important to prevent the spindle hub that supports the magnetic disk medium from becoming eccentric even when the environmental temperature changes.

〔従来の技術〕[Conventional technology]

従来の磁気ディスク装置におけるスピンドルハブの軸受
支持構造を第4図に示す。この軸受支持構造は、アルミ
製のスピンドルハブ1に対して鋼製のころがり軸受2の
外輪2aが嵌合され、その内輪2bが図示なき筐体に固
定された固定軸3により支持されている。なおスピンド
ルハブ1には、そのフランジ4上に複数枚の磁気ディス
ク媒体5がスペーサ6と交互に積層され、クランプリン
グ7と複数本のねじ8により押圧固定されている。
FIG. 4 shows a bearing support structure for a spindle hub in a conventional magnetic disk drive. In this bearing support structure, an outer ring 2a of a steel rolling bearing 2 is fitted into an aluminum spindle hub 1, and an inner ring 2b thereof is supported by a fixed shaft 3 fixed to a housing (not shown). A plurality of magnetic disk media 5 are stacked alternately with spacers 6 on a flange 4 of the spindle hub 1, and are pressed and fixed by a clamp ring 7 and a plurality of screws 8.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上記従来の磁気ディスク装置におけるスピンドルハブの
軸受支持構造では、アルミ製のスピンドルハブに対して
鋼製のころがり軸受2を嵌合しているため、環境温度が
変化すると、各材料の線膨張係数の差によりスピンドル
ハブ1はころがり軸受周辺部に熱変形を生ずる。この変
形は理論的には軸対称ではあるが、実際には、スピンド
ルハブ1ところがり軸受2の嵌合部は微視的には完全な
軸対称ではなく、またスピンドルハブ1とクランプリン
グ7、又はクランプリング7と最上層の磁気ディスク媒
体5a間の保持力(摩擦力)も同様に完全な軸対称では
ない。その結果、温度の変化によってスピンドルハブ1
上で最上層の磁気ディスク媒体5aがずれ、スピンドル
ハブ1のほぼ中央に位置するサーボディスク5bに対し
てトラック位置がずれる熱オフトラックが生ずるという
問題があった。
In the bearing support structure of the spindle hub in the conventional magnetic disk drive described above, the steel rolling bearing 2 is fitted to the aluminum spindle hub, so when the environmental temperature changes, the coefficient of linear expansion of each material changes. The difference causes thermal deformation of the spindle hub 1 around the rolling bearing. Although this deformation is theoretically axially symmetrical, in reality, the fitting part between the spindle hub 1 and the rolling bearing 2 is not microscopically completely axially symmetrical, and the spindle hub 1 and the clamp ring 7 are not completely axially symmetrical in reality. Similarly, the holding force (frictional force) between the clamp ring 7 and the uppermost magnetic disk medium 5a is not completely axially symmetrical. As a result, due to temperature changes, spindle hub 1
There is a problem in that the uppermost magnetic disk medium 5a is displaced and the track position is displaced relative to the servo disk 5b located approximately at the center of the spindle hub 1, resulting in a thermal off-track.

この問題を解決するため、第5図に示すようにスピンド
ルハブ1のころがり軸受嵌合部の外周に軸方向の一方が
開口した環状のスリット9を設ける方法がある。これは
スリット9を設けることにより、嵌合部付近の熱変形を
磁気ディスク媒体に伝えないことを目的としている。し
かしながら、この方法はスピンドルハブ1のころがり軸
受嵌合部付近は片持ち構造となり、ラジアル剛性が低下
して振動特性が悪化することと、嵌合部で生ずる熱応力
によりころがり軸受の外輪2aが軸受幅の中心線りに対
して非対称に変形し、回転精度が低下すること等により
、トラックに対するヘッド位置決め精度が低下するとい
う問題がある。
To solve this problem, as shown in FIG. 5, there is a method of providing an annular slit 9 on the outer periphery of the rolling bearing fitting portion of the spindle hub 1 with one axial end open. The purpose of this is to prevent thermal deformation near the fitting portion from being transmitted to the magnetic disk medium by providing the slit 9. However, this method results in a cantilevered structure in the vicinity of the rolling bearing fitting part of the spindle hub 1, which reduces radial rigidity and deteriorates vibration characteristics, and also causes the outer ring 2a of the rolling bearing to become unbearable due to thermal stress generated at the fitting part. There is a problem in that the head positioning accuracy with respect to the track is reduced due to asymmetrical deformation with respect to the center line of the width and a reduction in rotational accuracy.

本発明は上記従来の問題点に鑑み、温度変化による回転
体の偏心を防止した低熱歪軸受支持構造を提供すること
を目的とする。
SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to provide a low thermal strain bearing support structure that prevents eccentricity of a rotating body due to temperature changes.

〔課題を解決するための手段〕[Means to solve the problem]

上記目的を達成するために本発明の低熱歪軸受支持構造
では、回転体1を回転自在に支持するころがり軸受2が
外軸回転型である軸受支持構造において、回転体lのこ
ろがり軸受2を嵌合する部分に、該ころがり軸受2と同
心で、且つ一方が開口した環状スリット9を設け、該環
状スリット9の開口部を環状部材10で塞ぐように構成
したことを特徴とする。さらに回転体1のころがり軸受
外輪2aと接触する部分をころがり軸受幅方向の中心付
近に限定したことを特徴とする。
In order to achieve the above object, in the low thermal strain bearing support structure of the present invention, in a bearing support structure in which the rolling bearing 2 that rotatably supports the rotating body 1 is of an external shaft rotation type, the rolling bearing 2 of the rotating body l is fitted. It is characterized in that an annular slit 9 that is concentric with the rolling bearing 2 and open at one end is provided at the mating portion, and that the opening of the annular slit 9 is closed with an annular member 10. A further feature is that the portion of the rotating body 1 that contacts the rolling bearing outer ring 2a is limited to the vicinity of the center in the rolling bearing width direction.

〔作 用〕[For production]

回転体1に設けた環状スリット9の開口部を環状部材1
0で塞ぐことにより、該スリット9により片持構造とな
った部分が両持構造となるため、該部分のラジアル剛性
が増加し振動特性が改善されると共に、ころがり軸受外
輪2aの変形が非対称でなくなる。このため回転体1の
熱歪による偏心は小さくなる。さらに回転体1ところが
り軸受外輪2aとの接触部をころがり軸受幅の中心付近
に限定することにより、ころがり軸受外輪2aの変形が
対称となり、回転精度の低下を防ぐことができる。
The opening of the annular slit 9 provided in the rotating body 1 is connected to the annular member 1.
By closing the slit 9 with a cantilevered structure, the slit 9 becomes a double-sided structure, increasing the radial rigidity of the part and improving the vibration characteristics. It disappears. Therefore, the eccentricity of the rotating body 1 due to thermal strain is reduced. Further, by limiting the contact portion between the rotating body 1 and the rolling bearing outer ring 2a to the vicinity of the center of the rolling bearing width, the rolling bearing outer ring 2a is deformed symmetrically, and a decrease in rotation accuracy can be prevented.

〔実施例〕〔Example〕

第1図は本発明の第1の実施例を説明するための図であ
る。
FIG. 1 is a diagram for explaining a first embodiment of the present invention.

同図(a)において、1は回転体であり、磁気ディスク
装置のスピンドルハブを示している。該スピンドルハブ
lはアルミ製でありころがり軸受2によって図示なき筐
体に固定された固定$1113に支持されている。そし
て、ころがり軸受2の外輪2aとの嵌合部の外周には薄
肉部1aが形成されるように、ころがり軸受2と同心の
環状スリット9が設けられ、且つ該スリット9の開口部
を環状の部材10で塞いでいる。また該スピンドルハブ
1には、そのフランジ4上に複数枚の磁気ディスク媒体
5がスペーサ6と交互に積層支持され、その最上層をク
ランプリング7と複数本のねじ8によって押圧固定され
ている。
In FIG. 1A, 1 is a rotating body, which is a spindle hub of a magnetic disk device. The spindle hub 1 is made of aluminum and is supported by a rolling bearing 2 on a fixed bolt 1113 fixed to a casing (not shown). An annular slit 9 concentric with the rolling bearing 2 is provided so that a thin wall portion 1a is formed on the outer periphery of the fitting portion of the rolling bearing 2 with the outer ring 2a, and an annular slit 9 is provided at the opening of the slit 9. It is closed with a member 10. Further, a plurality of magnetic disk media 5 are supported on the flange 4 of the spindle hub 1 in a stacked manner alternately with spacers 6, and the uppermost layer thereof is pressed and fixed by a clamp ring 7 and a plurality of screws 8.

このように構成された本実施例は、第1図(a)に示す
状態から環境温度が低下すると、アルミ製のスピンドル
ハブ1は鋼製のころがり軸受より熱膨張係数が大である
ため、ころがり軸受2よりも大きく収縮する。この収縮
によりスピンドルハブ1は第1図(b)に示すように剛
性の低い薄肉部1aが変形し、収縮量を吸収する。この
薄肉部1aの変形は、該薄肉部1aの自由端が環状部材
10により支持されて両持構造となっているのでほぼ円
弧状に変形する。従ってころがり軸受2の外輪2aも多
少変形するが、その変形は軸受幅方向の中心線りに対し
てほぼ対称となる。このためころがり軸受の回転精度の
低下は少なくなる。また薄肉部1aの両持構造は片持構
造の場合よりも振動特性が向上するため、前記のころが
り軸受の回転精度の向上と相まってスピンドルハブの偏
心ヲ防止することができる。
In this embodiment configured in this way, when the environmental temperature decreases from the state shown in FIG. It contracts more than bearing 2. Due to this contraction, the thin wall portion 1a of the spindle hub 1 having low rigidity deforms as shown in FIG. 1(b), and absorbs the amount of contraction. The thin portion 1a deforms into a substantially arcuate shape because the free end of the thin portion 1a is supported by the annular member 10 to form a double-supported structure. Therefore, the outer ring 2a of the rolling bearing 2 is also deformed to some extent, but the deformation is approximately symmetrical with respect to the center line in the width direction of the bearing. As a result, the rotational accuracy of the rolling bearing is less likely to deteriorate. In addition, since the structure in which the thin wall portion 1a is supported on both sides has better vibration characteristics than in the case of a cantilevered structure, eccentricity of the spindle hub can be prevented in combination with the improvement in rotational accuracy of the rolling bearing.

第2図は本発明の第2の実施例を説明するための図であ
る。同図において第1図と同一部分は同一符号を付して
示した。なお11はスピンドルハブの薄肉部に形成した
突起である。
FIG. 2 is a diagram for explaining a second embodiment of the present invention. In this figure, the same parts as in FIG. 1 are designated by the same reference numerals. Note that 11 is a protrusion formed on the thin wall portion of the spindle hub.

本実施例は第1の実施例とほぼ同様であり、異なるとこ
ろは、スピンドルハブ1ところがり軸受外輪2aとの嵌
合部における接触部を、ころがり軸受2の軸方向の中心
部付近に限定したことである。このため薄肉部1aに突
起11を設けている。
This embodiment is almost the same as the first embodiment, and the difference is that the contact area between the spindle hub 1 and the rolling bearing outer ring 2a is limited to the vicinity of the axial center of the rolling bearing 2. That's true. For this purpose, a protrusion 11 is provided on the thin portion 1a.

このように構成された本実施例は第2図(b)に示すよ
うに、温度変化により薄肉部1aが変形しても、ころが
り軸受外輪2aは、その幅方向の中心部分で薄肉部1a
の突起11に接触しているのみであるので非対称な変形
は生じない。また、軸受の変形も小さくてすむ。このた
め回転精度も前実施例に増して良好となる。
As shown in FIG. 2(b), in this embodiment configured in this way, even if the thin wall portion 1a is deformed due to a temperature change, the rolling bearing outer ring 2a will maintain the thin wall portion 1a at the central portion in the width direction.
Since it is only in contact with the protrusion 11, no asymmetrical deformation occurs. Furthermore, deformation of the bearing can be kept small. Therefore, the rotation accuracy is also better than in the previous embodiment.

第3図は本発明の第3の実施例を示す図である。FIG. 3 is a diagram showing a third embodiment of the present invention.

同図において第2図と同一部分は同一符号を付して示し
た。
In this figure, the same parts as in FIG. 2 are designated by the same reference numerals.

本実施例は、基本的には第1図又は第2図に示した実施
例と同様であり、異なるところは、スリット9の開口部
を塞いだ環状部材10の代わりに、クランプリング7の
一部を用いたものである。これにより部品点数を少なく
して前実施例と同様の効果を得ることができる。
This embodiment is basically the same as the embodiment shown in FIG. 1 or 2, and the difference is that instead of the annular member 10 that closes the opening of the slit 9, a clamp ring 7 is used. This is the one using the part. This makes it possible to reduce the number of parts and obtain the same effects as in the previous embodiment.

以上の各実施例は回転体として磁気ディスク装置のスピ
ンドルハブを例にとり説明したが、ヘッドポジショナ−
ロータ等、他にも応用可能である。
Each of the above embodiments has been explained using the spindle hub of a magnetic disk device as an example of the rotating body, but the head positioner
It can also be applied to other applications such as rotors.

〔発明の効果〕〔Effect of the invention〕

以上説明した様に、本発明によれば、回転体のころがり
軸受外輪に嵌合する部分の周囲に両持構造の環状スリッ
トを設けることにより、振動特性及び回転精度の低下を
なくし、回転体の偏心を防止することが可能となる。
As explained above, according to the present invention, by providing an annular slit with a dual support structure around the part of the rotating body that fits into the outer ring of the rolling bearing, deterioration in vibration characteristics and rotational accuracy is eliminated, and the rotational accuracy of the rotating body is prevented. It becomes possible to prevent eccentricity.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の第1の実施例を説明するための図、 第2図は本発明の第2の実施例を説明するための図、 第3図は本発明の第3の実施例を示す図、第4図は従来
の磁気ディスク装置におけるスピンドルハブの軸受支持
構造を示す図、 第5ryJは従来の低熱歪軸受支持構造を示す図である
。 図において、 1はスピンドルハブ(回転体)、 2はころがり軸受、 2aはころがり軸受外輪、 2bはころがり軸受内輪、 3は固定軸、 4はフランジ、 5は磁気ディスク媒体、 6はスペーサ、 7はクランプリング、 8はねじ、 9は環状スリット、 10は環状部材、 11は突起 を示す。
FIG. 1 is a diagram for explaining a first embodiment of the present invention, FIG. 2 is a diagram for explaining a second embodiment of the present invention, and FIG. 3 is a diagram for explaining a third embodiment of the present invention. FIG. 4 is a diagram showing a bearing support structure for a spindle hub in a conventional magnetic disk device. FIG. 5 is a diagram showing a conventional low thermal distortion bearing support structure. In the figure, 1 is a spindle hub (rotating body), 2 is a rolling bearing, 2a is a rolling bearing outer ring, 2b is a rolling bearing inner ring, 3 is a fixed shaft, 4 is a flange, 5 is a magnetic disk medium, 6 is a spacer, 7 is a Clamp ring, 8 is a screw, 9 is an annular slit, 10 is an annular member, and 11 is a protrusion.

Claims (1)

【特許請求の範囲】 1、回転体(1)を回転自在に支持するころがり軸受(
2)が外輪回転型である軸受支持構造において、 回転体(1)のころがり軸受(2)を嵌合する部分に、
該ころがり軸受(2)と同心で且つ一方が開口した環状
スリット(9)を設け、該環状スリット(9)の開口部
を環状部材(10)で塞いだことを特徴とする低熱歪軸
受支持構造。 2、上記回転体(1)のころがり軸受外輪 (2a)と接触する部分を、ころがり軸受幅方向の中心
付近に限定したことを特徴とする請求項1記載の低熱歪
軸受支持構造。
[Claims] 1. A rolling bearing (which rotatably supports the rotating body (1))
In a bearing support structure in which 2) is an outer ring rotating type, a part of the rotating body (1) into which the rolling bearing (2) is fitted,
A low thermal strain bearing support structure characterized in that an annular slit (9) concentric with the rolling bearing (2) and open at one end is provided, and the opening of the annular slit (9) is closed with an annular member (10). . 2. The low thermal strain bearing support structure according to claim 1, wherein the portion of the rotating body (1) that contacts the rolling bearing outer ring (2a) is limited to the vicinity of the center in the width direction of the rolling bearing.
JP12422790A 1990-05-16 1990-05-16 Low thermal strain bearing support structure Expired - Fee Related JP2897782B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12422790A JP2897782B2 (en) 1990-05-16 1990-05-16 Low thermal strain bearing support structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12422790A JP2897782B2 (en) 1990-05-16 1990-05-16 Low thermal strain bearing support structure

Publications (2)

Publication Number Publication Date
JPH0425621A true JPH0425621A (en) 1992-01-29
JP2897782B2 JP2897782B2 (en) 1999-05-31

Family

ID=14880138

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12422790A Expired - Fee Related JP2897782B2 (en) 1990-05-16 1990-05-16 Low thermal strain bearing support structure

Country Status (1)

Country Link
JP (1) JP2897782B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2349922A (en) * 1999-05-14 2000-11-15 Bosch Gmbh Robert Pump unit bearing arrangement
JP2004522090A (en) * 2001-03-27 2004-07-22 ハンセン・トランスミッションズ・インターナショナル・ナムローゼフェンノートシャップ Roller bearing assembly
CN107659036A (en) * 2017-10-30 2018-02-02 南京磁谷科技有限公司 The radial direction magnetic bearing holder structure of thermal expansion deformation is compensated in magnetic suspension motor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2349922A (en) * 1999-05-14 2000-11-15 Bosch Gmbh Robert Pump unit bearing arrangement
GB2349922B (en) * 1999-05-14 2001-04-25 Bosch Gmbh Robert Pump unit
JP2004522090A (en) * 2001-03-27 2004-07-22 ハンセン・トランスミッションズ・インターナショナル・ナムローゼフェンノートシャップ Roller bearing assembly
CN107659036A (en) * 2017-10-30 2018-02-02 南京磁谷科技有限公司 The radial direction magnetic bearing holder structure of thermal expansion deformation is compensated in magnetic suspension motor

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