JP2002233099A - Spindle motor for magnetic disk and its manufacturing method - Google Patents
Spindle motor for magnetic disk and its manufacturing methodInfo
- Publication number
- JP2002233099A JP2002233099A JP2001022543A JP2001022543A JP2002233099A JP 2002233099 A JP2002233099 A JP 2002233099A JP 2001022543 A JP2001022543 A JP 2001022543A JP 2001022543 A JP2001022543 A JP 2001022543A JP 2002233099 A JP2002233099 A JP 2002233099A
- Authority
- JP
- Japan
- Prior art keywords
- hub
- bearing
- bearings
- spindle motor
- magnetic disk
- 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.)
- Pending
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
- 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
- F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
- F16C35/067—Fixing them in a housing
-
- 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
- F16C19/54—Systems consisting of a plurality of bearings with rolling friction
-
- 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)
- Mechanical Engineering (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Mounting Of Bearings Or Others (AREA)
- Rotational Drive Of Disk (AREA)
- Motor Or Generator Frames (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、磁気ディスク用ス
ピンドルモータとその製造方法に関するものであり、特
に軸受組み付け部分の初期モータ特性の改善と信頼性の
向上を図るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle motor for a magnetic disk and a method of manufacturing the same, and more particularly to an improvement in initial motor characteristics and reliability in a bearing assembly portion.
【０００２】[0002]
【従来の技術】磁気ディスク用スピンドルモータは、図
５，図６に示すように、固定側としてのベース１にシャ
フト８の基端部が圧入され、シャフト８の外周部には一
対のベアリング６ａ，６ｂを介してディスク１４を搭載
するハブ３が回転自在に支持されている。2. Description of the Related Art As shown in FIGS. 5 and 6, a spindle motor for a magnetic disk has a base 1 of a shaft 8 press-fitted into a base 1 as a fixed side, and a pair of bearings 6a on an outer periphery of the shaft 8. , 6b rotatably supports the hub 3 on which the disk 14 is mounted.
【０００３】ベース１にはステータコアにコイルを巻き
つけた固定子２が接着剤にて固定され、ハブ３の固定子
２との対向面には磁気回路を構成するバックヨーク４を
介してマグネット５が取り付けられ、固定子２とマグネ
ット５とが一定の空隙を持って配置され、コイルに流れ
る電流が形成する交流磁界とマグネット５との磁界によ
りハブ３に回転力が生じるよう構成されている。A stator 2 having a coil wound around a stator core is fixed to the base 1 with an adhesive, and a magnet 5 is provided on a surface of the hub 3 facing the stator 2 via a back yoke 4 constituting a magnetic circuit. Is mounted, the stator 2 and the magnet 5 are arranged with a certain gap, and a rotating force is generated in the hub 3 by an AC magnetic field generated by a current flowing through the coil and the magnetic field of the magnet 5.
【０００４】シャフト８の先端には、ベアリング６ａ，
６ｂの間で発生するオイルミストの磁気ディスク１４へ
の飛散を防ぐためにラビリンスシール７が配置され、ラ
ビリンスシール７はその外周部がハブ３の内側に圧入固
定され、圧入部の外側は図示されていない接着剤にてシ
ールされている。[0004] Bearings 6a,
A labyrinth seal 7 is arranged to prevent the oil mist generated between 6b from scattering on the magnetic disk 14, and the outer periphery of the labyrinth seal 7 is press-fitted and fixed inside the hub 3, and the outside of the press-fit portion is shown. Not sealed with no adhesive.
【０００５】上記のように構成されたスピンドルモータ
では、軸受け部分において非常に高精度な部品精度と温
度変化による変形が小さいことが要求されるため、ベア
リング６ａ，６ｂのハブ３への取り付けは、一般にしま
りばめ設計にて行われる。すなわち、ベアリング６ａ，
６ｂの取り付け位置におけるハブ３の内径Ｒ１をベアリ
ング６ａ，６ｂの外径Ｒ３よりも小さく設定して、ハブ
３の内側にベアリング６ａ，６ｂを圧入し、ベアリング
６ａ，６ｂの外周面をハブ３の内周面に締め付けるとと
もに接着剤１５にて固定している。In the spindle motor constructed as described above, it is required that the bearings have extremely high precision in the parts and small deformation due to temperature changes. Therefore, the mounting of the bearings 6a and 6b to the hub 3 requires Generally, it is performed with a tight fit design. That is, the bearings 6a,
The inner diameter R1 of the hub 3 at the mounting position of the hub 6b is set smaller than the outer diameter R3 of the bearings 6a and 6b, and the bearings 6a and 6b are pressed into the hub 3 and the outer peripheral surfaces of the bearings 6a and 6b are It is fastened to the inner peripheral surface and fixed with an adhesive 15.
【０００６】なお、図７に示すように、ハブ３もしくは
ベアリング６ａ，６ｂの一部に凹部１６のように接着剤
１５を溜める目的で逃がしが形成されているものもある
が、全て常温環境下（２５℃想定）においてベアリング
６ａ，６ｂの外径Ｒ３がハブ３の内径Ｒ１よりも大きく
なるよう設計されている。[0007] As shown in FIG. 7, there is a hub 3 or a part of the bearings 6 a, 6 b in which a relief is formed for the purpose of storing the adhesive 15, such as a concave portion 16, but all of them are formed under a normal temperature environment. The outer diameter R3 of the bearings 6a and 6b is designed to be larger than the inner diameter R1 of the hub 3 (assumed at 25 ° C.).
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、上記の
ようなしまりばめによるベアリング６ａ，６ｂのハブ３
への取り付け方法では、ベアリング６ａ，６ｂを精度良
く仕上げても、ハブ３への圧入時にベアリング６ａ，６
ｂの外輪１１に対して変形やひずみを与えてしまい、ス
ピンドルモータの初期性能が劣るという問題がある。However, the hub 3 of the bearings 6a, 6b is formed by the above-mentioned interference fit.
According to the mounting method, the bearings 6a and 6b can be press-fitted into the hub 3 even if the bearings 6a and 6b are finished with high precision.
Deformation or distortion is applied to the outer ring 11 of (b), and the initial performance of the spindle motor is deteriorated.
【０００８】また、ベアリング６ａ，６ｂの変形やひず
みを生じたまま組み立てたスピンドルモータでは、温度
変化が生じるとベアリング６ａ，６ｂとハブ３との材質
の違いから組立初期に歪んでいた要素がさらに変化し
て、モータ特性を大きく変化させてしまう。In a spindle motor assembled with the bearings 6a, 6b deformed or distorted, if the temperature changes, the elements distorted in the initial stage of assembly due to the difference in the materials of the bearings 6a, 6b and the hub 3 are further increased. Changes, which greatly changes the motor characteristics.
【０００９】なお、ハブ３の内径Ｒ１をベアリング６
ａ，６ｂの外径Ｒ３よりも大きく設計すると、ベアリン
グ６ａ，６ｂとハブ３の内周面との間に隙間が生じるた
め、組立を行う際に位置ズレや抜け落ちが発生し、さら
に一対のベアリング６ａ，６ｂの芯ずれが発生すること
から、このような設計の採用は行われていない。The inner diameter R1 of the hub 3 is
If the outer diameter R3 is designed to be larger than the outer diameter R3 of the bearings 6a and 6b, a gap is generated between the bearings 6a and 6b and the inner peripheral surface of the hub 3, so that a displacement or dropout occurs during assembly, and a pair of bearings is formed. Such a design has not been adopted since the misalignment of 6a and 6b occurs.
【００１０】本発明は前記問題点を解決し、ベアリング
とハブの組み付け精度が良く、モータの初期特性の改善
と信頼性の向上が図れる磁気ディスク用スピンドルモー
タを提供することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic disk spindle motor which solves the above-mentioned problems, has a high accuracy in assembling a bearing and a hub, and can improve initial characteristics and reliability of the motor.
【００１１】[0011]
【課題を解決するための手段】本発明の磁気ディスク用
スピンドルモータは、ベアリングの外径よりも大きく設
計したハブの内周面の一部に凸部を設けて、すきまばめ
としまりばめによりベアリングをハブに取り付けたこと
特徴とする。SUMMARY OF THE INVENTION A spindle motor for a magnetic disk according to the present invention is provided with a convex portion on a part of an inner peripheral surface of a hub designed to be larger than an outer diameter of a bearing so as to have a clearance fit and an interference fit. The bearing is attached to the hub by means of
【００１２】この本発明によると、ベアリングの平衡度
の改善が図れ、モータ初期性能の大幅な改善が実現でき
る。本発明の磁気ディスク用スピンドルモータの製造方
法は、ハブの内側のベアリングの配置位置に一対の凸部
を設けて一対の凸部の間に接着剤を塗布してベアリング
をハブに取り付けることを特徴とする。According to the present invention, the balance of the bearing can be improved, and the initial performance of the motor can be greatly improved. The method for manufacturing a spindle motor for a magnetic disk according to the present invention is characterized in that a pair of convex portions are provided at the positions of the bearings inside the hub, an adhesive is applied between the pair of convex portions, and the bearing is attached to the hub. And
【００１３】この本発明によると、容易な圧入荷重で組
みつけを行うだけでベアリングの外輪精度に影響を与え
ることなくベアリングをハブに取り付けられ、組み付け
精度が良く、信頼性の高いスピンドルモータを実現でき
る。According to the present invention, the bearing can be mounted on the hub without affecting the outer race accuracy of the bearing simply by assembling with a simple press-fitting load, realizing a spindle motor with good assembling accuracy and high reliability. it can.
【００１４】[0014]
【発明の実施の形態】本発明の請求項１記載の磁気ディ
スク用スピンドルモータは、シャフトの外周とハブの内
周との間にベアリングを設けて前記ハブを前記シャフト
に対して回転自在に支持したスピンドルモータであっ
て、ベアリングの取り付け位置におけるハブの内径を前
記ベアリングの外径よりも大きく設定するとともに、そ
の一部は前記ベアリングの外径よりも小さくなるよう前
記ハブの内周面に環状の凸部を設け、ハブの内側に配置
された前記ベアリングをすきばめするとともに、前記凸
部でしまりばめして前記ベアリングをハブの内側に取り
付けたことを特徴とする。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a spindle motor for a magnetic disk according to a first aspect of the present invention, a bearing is provided between an outer periphery of a shaft and an inner periphery of a hub to support the hub rotatably with respect to the shaft. The inner diameter of the hub at the mounting position of the bearing is set to be larger than the outer diameter of the bearing, and a part of the hub is annularly formed on the inner peripheral surface of the hub so as to be smaller than the outer diameter of the bearing. And the bearing arranged inside the hub is shrink-fitted, and the bearing is fitted inside the hub by tightly fitting the bearing.
【００１５】この構成によると、ベアリング外輪精度に
影響を与えることなくベアリングのハブへの組み付けが
行え、上下ベアリングの平衡度の改善とモータ初期性能
の改善が実現でき、さらに環境温度の変化によるモータ
特性の劣化を低減して長期にわたって安定した駆動を実
現できる。According to this configuration, the bearing can be assembled to the hub without affecting the accuracy of the outer race of the bearing, the balance of the upper and lower bearings can be improved, and the initial performance of the motor can be improved. Deterioration of characteristics can be reduced, and stable driving can be realized for a long time.
【００１６】本発明の請求項２記載の磁気ディスク用ス
ピンドルモータは、請求項１において、前記凸部の厚み
が０．５ｍｍ以下であることを特徴とする。この構成に
よると、より精度が良く、安定したベアリングの取り付
けが実現できる。According to a second aspect of the present invention, in the spindle motor for a magnetic disk according to the first aspect, the thickness of the projection is 0.5 mm or less. According to this configuration, more accurate and stable mounting of the bearing can be realized.
【００１７】本発明の請求項３記載の磁気ディスク用ス
ピンドルモータは、請求項１または請求項２において、
前記凸部と前記ベアリングの外輪の肉厚部とが対向する
よう前記ハブと前記ベアリングを配置したことを特徴と
する。According to a third aspect of the present invention, there is provided a magnetic disk spindle motor according to the first or second aspect.
The hub and the bearing are arranged so that the convex portion and the thick portion of the outer ring of the bearing face each other.
【００１８】この構成によると、しまりばめによる応力
がベアリングの肉厚部にかかるため、ベアリング外輪精
度へ与える影響を低減できる。本発明の請求項４記載の
磁気ディスク用スピンドルモータは、請求項１〜請求項
３のいずれかにおいて、前記凸部を、ベアリングの外輪
とボールの当接位置と同じか外側に設けたことを特徴と
する。According to this configuration, since the stress due to the interference fit is applied to the thick portion of the bearing, the influence on the accuracy of the outer race of the bearing can be reduced. According to a fourth aspect of the present invention, there is provided a magnetic disk spindle motor according to any one of the first to third aspects, wherein the convex portion is provided at the same position as or outside the contact position between the outer ring of the bearing and the ball. Features.
【００１９】この構成によると、ベアリング組み付け芯
ズレ精度を確保して、ベアリングの平衡度を改善でき
る。本発明の請求項５記載の磁気ディスク用スピンドル
モータは、請求項１〜請求項４のいずれかにおいて、前
記凸部のしめ代を１μｍ〜１５μｍに設定したことを特
徴とする。According to this configuration, it is possible to secure the accuracy of the misalignment of the bearing assembly center and improve the balance of the bearing. A magnetic disk spindle motor according to a fifth aspect of the present invention is characterized in that, in any one of the first to fourth aspects, the interference of the projection is set to 1 μm to 15 μm.
【００２０】この構成によると、外輪精度に影響を与え
ずに容易な圧入荷重でベアリングをハブに組みつけられ
る。本発明の請求項６記載の磁気ディスク用スピンドル
モータの製造方法は、シャフトの外周とハブの内周との
間に一対のベアリングを配置して前記ハブを前記シャフ
トに対して回転自在に支持したスピンドルモータを製造
するに際し、ベアリングの取り付け位置におけるハブの
内径を前記ベアリングの外径よりも大きく設定するとと
もに、その一部は前記ベアリングの外径よりも小さくな
るよう前記ハブの内周面に凸部を設け、前記一対の凸部
が形成された位置の内側に接着剤を塗布したハブに前記
ベアリングを圧入して前記ベアリングをすきばめすると
ともに前記凸部でしまりばめし、前記ベアリングを前記
ハブの内側に取り付けることを特徴とする。According to this configuration, the bearing can be assembled to the hub with an easy press-fit load without affecting the accuracy of the outer race. According to a sixth aspect of the present invention, in the method of manufacturing a magnetic disk spindle motor, a pair of bearings are disposed between an outer periphery of the shaft and an inner periphery of the hub, and the hub is rotatably supported with respect to the shaft. When manufacturing the spindle motor, the inner diameter of the hub at the mounting position of the bearing is set to be larger than the outer diameter of the bearing, and a part of the inner diameter is convex to the inner peripheral surface of the hub so as to be smaller than the outer diameter of the bearing. Part, and press-fits the bearing into a hub coated with an adhesive inside the position where the pair of protrusions are formed, fits the bearing together, and fits the bearing together. It is characterized in that it is attached inside the hub.
【００２１】この構成によると、ベアリング外輪精度に
影響を与えずにベアリングとハブの固定を強固にでき
る。以下、本発明の具体的な実施の形態を、図１〜図４
を用いて説明する。According to this configuration, the bearing and the hub can be firmly fixed without affecting the accuracy of the bearing outer ring. Hereinafter, specific embodiments of the present invention will be described with reference to FIGS.
This will be described with reference to FIG.
【００２２】なお、上記従来例を示す図５〜図７と同様
の構成をなすものには、同一の符号を付けて説明する。
図１，図２に示すように、図５，図６と同様に構成され
た磁気ディスク用スピンドルモータにおいて、この実施
の形態では、ベアリング６ａ，６ｂの外径Ｒ３よりも大
きく設計されたハブ３の内周面の一部に凸部９を設け
て、ハブ３の内側にすきまばめされたベアリング６ａ，
６ｂを凸部９でしまりばめした点で、上記従来例とは異
なる。The components having the same configuration as that of the conventional example shown in FIGS. 5 to 7 are denoted by the same reference numerals.
As shown in FIGS. 1 and 2, in the magnetic disk spindle motor constructed in the same manner as in FIGS. 5 and 6, in this embodiment, the hub 3 designed to be larger than the outer diameter R3 of the bearings 6a and 6b. The protrusions 9 are provided on a part of the inner peripheral surface of the bearing 3a, and the bearings 6a,
6B is different from the above-mentioned conventional example in that the protrusions 6b are fitted with the convex portions 9.
【００２３】詳細には、シャフト８の外周とハブ３の内
周との間にベアリング６ａ，６ｂを設けてハブ３をシャ
フト８に対して回転自在に支持したスピンドルモータに
おいて、ハブ３のベアリング６ａ，６ｂの取り付け位置
における内径Ｒ１は、常温状態（２５℃）でベアリング
６ａ，６ｂの外径Ｒ３よりも大きく形成されている。More specifically, in a spindle motor in which bearings 6a and 6b are provided between the outer periphery of the shaft 8 and the inner periphery of the hub 3 to rotatably support the hub 3 with respect to the shaft 8, the bearing 6a , 6b is larger than the outer diameter R3 of the bearings 6a, 6b at room temperature (25 ° C.).
【００２４】このハブ３の内周面の一部には、その内径
Ｒ２がベアリング６ａ，６ｂの外径Ｒ３よりも小さくな
るように環状の凸部９が形成されている。ここで、ハブ
３はアルミニウム（Ａ２０１１）からなり、凸部９は切
削加工により形成されている。An annular projection 9 is formed on a part of the inner peripheral surface of the hub 3 so that its inner diameter R2 is smaller than the outer diameter R3 of the bearings 6a and 6b. Here, the hub 3 is made of aluminum (A2011), and the projections 9 are formed by cutting.
【００２５】上記のように構成されたハブ３の内側にベ
アリング６ａ，６ｂが配置されると、ベアリング６ａ，
６ｂの外径Ｒ３よりもその内径Ｒ１が大きい部分ではベ
アリング６ａ，６ｂがすきばめされ、凸部９が形成され
た部分、すなわち内径Ｒ２がベアリング６ａ，６ｂの外
径Ｒ３よりも小さく形成された部分では、凸部９が塑性
変形してベアリング６ａ，６ｂがしまりばめされる。When the bearings 6a and 6b are arranged inside the hub 3 configured as described above, the bearings 6a and 6b
The bearings 6a and 6b are loosely fitted in the portion where the inner diameter R1 is larger than the outer diameter R3 of the bearing 6b, and the portion where the convex portion 9 is formed, that is, the inner diameter R2 is formed smaller than the outer diameter R3 of the bearings 6a and 6b. In the bent portion, the convex portion 9 is plastically deformed, and the bearings 6a and 6b are tightly fitted.
【００２６】このようにすきまばめされた部分を設ける
ことでベアリング６ａ，６ｂの外輪１１にかかる力が小
さくなって外輪１１の変形やひずみを低減でき、モータ
の初期性能の劣化を抑制できる。また、すきまばめされ
た部分の一部にしまりばめされた部分を設けることでベ
アリング６ａ，６ｂの位置ズレや抜け落ちを防止でき
る。さらに、精度の良いベアリング６ａ，６ｂの取り付
けが行えるため、使用時に温度変化が生じても、ベアリ
ング６ａ，６ｂとハブ３との素材の違いによるモータ特
性の劣化を低減できる。By providing such a loosely fitted portion, the force applied to the outer ring 11 of the bearings 6a and 6b is reduced, so that deformation and distortion of the outer ring 11 can be reduced, and deterioration of the initial performance of the motor can be suppressed. In addition, by providing the interference fit portion in a part of the clearance fit portion, it is possible to prevent the bearings 6a and 6b from being displaced or falling off. Furthermore, since the bearings 6a and 6b can be mounted with high accuracy, even if a temperature change occurs during use, deterioration of motor characteristics due to a difference in material between the bearings 6a and 6b and the hub 3 can be reduced.
【００２７】また、図３に示すように、凸部９の厚み、
具体的にはシャフト８の軸心方向の厚みｄを０．５ｍｍ
以下と幅狭にすると、ベアリング６ａ，６ｂの外輪１１
のゆがみをより低減できる。凸部９の厚みｄが０．５ｍ
ｍよりも大きくなると、ベアリング６ａ，６ｂの外輪１
１にかかる応力が大きくなりすぎて、外輪１１の精度に
影響を与える可能性がでてくる。Further, as shown in FIG.
Specifically, the thickness d of the shaft 8 in the axial direction is 0.5 mm.
When the width is reduced to the following, the outer race 11 of the bearings 6a and 6b is
Distortion can be further reduced. The thickness d of the projection 9 is 0.5 m
m, the outer rings 1 of the bearings 6a, 6b
There is a possibility that the stress applied to 1 becomes too large and affects the accuracy of the outer ring 11.
【００２８】また、凸部９をベアリング６ａ，６ｂの外
輪１１の肉厚部１１ａと対向するよう配置すると、しま
りばめによる応力がベアリング６ａ，６ｂの肉厚部１１
ａにかかるため、しまりばめされた部分での外輪１１の
変形を抑制でき、ベアリングの外輪精度へ与える影響を
低減できる。When the convex portion 9 is arranged so as to face the thick portion 11a of the outer ring 11 of the bearings 6a and 6b, the stress caused by the interference fit causes the thick portion 11 of the bearings 6a and 6b to be formed.
Therefore, the deformation of the outer ring 11 at the tightly fitted portion can be suppressed, and the influence of the bearing on the outer ring accuracy can be reduced.
【００２９】また凸部９とベアリング６ａ，６ｂの外輪
１１とのしめ代は、１μｍ〜１５μに設定するとより効
果的である。しめ代が１μｍよりも小さいと、ベアリン
グ６ａ，６ｂの位置ずれや芯ずれが発生しやすく、１５
μｍよりも大きいと、外輪１１に力がかかりすぎて外輪
精度に影響を与える可能性が生じる。It is more effective to set the interference between the projection 9 and the outer ring 11 of the bearings 6a and 6b to 1 μm to 15 μm. If the interference is smaller than 1 μm, the bearings 6a and 6b are likely to be misaligned or misaligned.
If it is larger than μm, there is a possibility that an excessive force is applied to the outer ring 11 to affect the accuracy of the outer ring.
【００３０】さらに、図４に示すように、一対の凸部９
を、ベアリング６ａの外輪１１とボール１３の当接位置
と同じか外側に設けることが好ましい。すなわち、ベア
リング６ａをしまりばめする凸部９はベアリング６ａの
外輪１１とボール１３の当接位置Ａと同じか外側の領域
Ｓ１に、ベアリング６ｂをしまりばめする凸部９はベア
リング６ａの外輪１１とボール１３の当接位置Ｂと同じ
が外側の領域Ｓ２に設けると、ベアリング６ａ，６ｂの
ボール１３に余分な力がかからなくなるため、ベアリン
グ組み付け芯ズレ精度を確保してベアリングの平衡度を
改善でき、モータの初期性能に優れたスピンドルモータ
が実現できる。Further, as shown in FIG.
Is preferably provided at the same position or outside of the contact position between the outer ring 11 of the bearing 6a and the ball 13. That is, the convex portion 9 for tightly fitting the bearing 6a is in the region S1 which is the same as or outside the contact position A between the outer ring 11 of the bearing 6a and the ball 13, and the convex portion 9 for tightly fitting the bearing 6b is in the outer ring of the bearing 6a. When the same contact position B between the ball 11 and the ball 13 is provided in the outer region S2, no extra force is applied to the ball 13 of the bearings 6a and 6b. And a spindle motor having excellent initial performance of the motor can be realized.
【００３１】また、上記のように構成されたスピンドル
モータを組み立てるに際し、ハブ３の一対の凸部９が形
成された位置の内側に接着剤１５を塗布してベアリング
６ａ，６ｂを圧入することで、ベアリング６ａ，６ｂの
外輪１１精度に影響を与えることなく、ベアリング６
ａ，６ｂとハブ３の固定を強固に行える。When assembling the spindle motor configured as described above, the adhesive 15 is applied to the inside of the position where the pair of convex portions 9 of the hub 3 is formed, and the bearings 6a and 6b are press-fitted. , Without affecting the accuracy of the outer race 11 of the bearings 6a, 6b.
a, 6b and the hub 3 can be firmly fixed.
【００３２】[0032]
【発明の効果】以上のように本発明の磁気ディスク用ス
ピンドルモータによると、シャフトの外周とハブの内周
との間にベアリングを設けて前記ハブを前記シャフトに
対して回転自在に支持したスピンドルモータであって、
ベアリングの取り付け位置におけるハブの内径を前記ベ
アリングの外径よりも大きく設定するとともに、その一
部は前記ベアリングの外径よりも小さくなるよう前記ハ
ブの内周面に環状の凸部を設け、ハブの内側に配置され
た前記ベアリングをすきばめするとともに、前記凸部で
しまりばめして前記ベアリングをハブの内側に取り付け
ることで、組み立て時のベアリングの位置ずれや抜け落
ち、また一対のベアリングの芯ずれを抑制できるだけで
なくベアリングのひずみを低減でき、精度のよいベアリ
ングのハブへの組み付けが行え、モータの初期性能の低
下を抑制できる。また、環境温度の変化によるモータ特
性の劣化を低減でき、長期間にわたって安定した駆動を
実現でき磁気ディスクドライブの用途拡大に寄与でき
る。As described above, according to the spindle motor for a magnetic disk of the present invention, the spindle provided with the bearing between the outer periphery of the shaft and the inner periphery of the hub and rotatably supporting the hub with respect to the shaft. A motor,
The inner diameter of the hub at the mounting position of the bearing is set larger than the outer diameter of the bearing, and a part thereof is provided with an annular convex portion on the inner peripheral surface of the hub so as to be smaller than the outer diameter of the bearing. By fitting the bearings arranged inside of the hub together and fitting the bearings inside the hub by fitting the bearings inside the hub, misalignment and dropout of the bearings during assembly, and the core of a pair of bearings Not only can the displacement be suppressed, but also the distortion of the bearing can be reduced, the bearing can be accurately assembled to the hub, and a decrease in the initial performance of the motor can be suppressed. Further, deterioration of motor characteristics due to a change in environmental temperature can be reduced, and stable driving can be realized for a long period of time, which can contribute to the expansion of applications of the magnetic disk drive.
【００３３】また、本発明のスピンドルモータの製造方
法によると、ベアリングの取り付け位置におけるハブの
内径を前記ベアリングの外径よりも大きく設定するとと
もに、その一部は前記ベアリングの外径よりも小さくな
るよう前記ハブの内周面に凸部を設け、前記一対の凸部
が形成された位置の内側に接着剤を塗布したハブに前記
ベアリングを圧入して前記ベアリングをすきばめすると
ともに前記凸部でしまりばめし、前記ベアリングを前記
ハブの内側に取り付けることで、容易な圧入荷重でベア
リングのハブへの組みつけを実現できる。According to the spindle motor manufacturing method of the present invention, the inner diameter of the hub at the mounting position of the bearing is set larger than the outer diameter of the bearing, and a part of the hub is smaller than the outer diameter of the bearing. A convex portion is provided on the inner peripheral surface of the hub, and the bearing is press-fitted into a hub coated with an adhesive inside a position where the pair of convex portions are formed, and the bearing is shrink-fitted and the convex portion is formed. By tightly fitting and mounting the bearing inside the hub, the bearing can be assembled to the hub with an easy press-fit load.
【図１】本発明の実施の形態におけるスピンドルモータ
の縦断面図FIG. 1 is a longitudinal sectional view of a spindle motor according to an embodiment of the present invention.
【図２】図１の組み付け状態を説明する分解図FIG. 2 is an exploded view illustrating an assembled state of FIG. 1;
【図３】図１の要部拡大断面図FIG. 3 is an enlarged sectional view of a main part of FIG. 1;
【図４】ベアリングとハブとの接合状態を示す要部拡大
模式図FIG. 4 is an enlarged schematic view of a main part showing a joint state between a bearing and a hub.
【図５】従来のスピンドルモータの縦断面図FIG. 5 is a longitudinal sectional view of a conventional spindle motor.
【図６】図５の組み付け状態を説明する分解図FIG. 6 is an exploded view illustrating the assembled state of FIG. 5;
【図７】図５の要部拡大図FIG. 7 is an enlarged view of a main part of FIG. 5;
３ ハブ ６ａ，６ｂ ベアリング ８ シャフト ９ 凸部 １１ 外輪 １３ ボール １５ 接着剤 Ｒ１ ハブの内径 Ｒ２ 凸部の内径 Ｒ３ ベアリングの外径 3 Hub 6a, 6b Bearing 8 Shaft 9 Convex part 11 Outer ring 13 Ball 15 Adhesive R1 Inner diameter of hub R2 Inner diameter of convex part R3 Outer diameter of bearing
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｈ０２Ｋ 21/22 Ｈ０２Ｋ 21/22 Ｍ Ｆターム(参考） 3J017 AA03 CA01 DA02 DB07 DB09 5D109 BA03 BA04 BA14 BA18 BA20 BA25 BB03 BB13 BB16 BB21 5H605 BB05 BB14 BB19 CC02 CC03 CC04 CC10 DD03 DD05 EA06 EA07 EB10 EB16 EB37 EB38 GG07 5H621 BB07 GA01 HH01 JK08 JK15 JK17 JK19 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) H02K 21/22 H02K 21/22 MF term (Reference) 3J017 AA03 CA01 DA02 DB07 DB09 5D109 BA03 BA04 BA14 BA18 BA20 BA25 BB03 BB13 BB16 BB21 5H605 BB05 BB14 BB19 CC02 CC03 CC04 CC10 DD03 DD05 EA06 EA07 EB10 EB16 EB37 EB38 GG07 5H621 BB07 GA01 HH01 JK08 JK15 JK17 JK19
Claims (6)
リングを設けて前記ハブを前記シャフトに対して回転自
在に支持したスピンドルモータであって、 ベアリングの取り付け位置におけるハブの内径を前記ベ
アリングの外径よりも大きく設定するとともに、その一
部は前記ベアリングの外径よりも小さくなるよう前記ハ
ブの内周面に環状の凸部を設け、 ハブの内側に配置された前記ベアリングをすきばめする
とともに、前記凸部でしまりばめして前記ベアリングを
ハブの内側に取り付けた磁気ディスク用スピンドルモー
タ。1. A spindle motor in which a bearing is provided between an outer periphery of a shaft and an inner periphery of a hub and the hub is rotatably supported with respect to the shaft. An annular convex portion is provided on the inner peripheral surface of the hub so that the outer diameter of the bearing is set to be larger than the outer diameter of the bearing and a part thereof is smaller than the outer diameter of the bearing. A spindle motor for a magnetic disk, wherein the bearing is fitted inside the hub while being fitted and fitted with the convex portion.
求項１記載の磁気ディスク用スピンドルモータ。2. The spindle motor for a magnetic disk according to claim 1, wherein the thickness of the projection is 0.5 mm or less.
とが対向するよう前記ハブと前記ベアリングを配置した
請求項１または請求項２記載の磁気ディスク用スピンド
ルモータ。3. The spindle motor for a magnetic disk according to claim 1, wherein the hub and the bearing are arranged so that the convex portion and a thick portion of an outer ring of the bearing face each other.
当接位置と同じか外側に設けた請求項１〜請求項３のい
ずれかに記載の磁気ディスク用スピンドルモータ。4. The spindle motor for a magnetic disk according to claim 1, wherein the convex portion is provided at the same position as or outside the contact position between the ball and the outer race of the bearing.
定した請求項１〜請求項４のいずれかに記載の磁気ディ
スク用スピンドルモータ。5. The spindle motor for a magnetic disk according to claim 1, wherein the interference of said projection is set to 1 μm to 15 μm.
のベアリングを配置して前記ハブを前記シャフトに対し
て回転自在に支持したスピンドルモータを製造するに際
し、 ベアリングの取り付け位置におけるハブの内径を前記ベ
アリングの外径よりも大きく設定するとともに、その一
部は前記ベアリングの外径よりも小さくなるよう前記ハ
ブの内周面に凸部を設け、 前記一対の凸部が形成された位置の内側に接着剤を塗布
したハブに前記ベアリングを圧入して前記ベアリングを
すきばめするとともに前記凸部でしまりばめし、前記ベ
アリングを前記ハブの内側に取り付ける磁気ディスク用
スピンドルモータの製造方法。6. When manufacturing a spindle motor in which a pair of bearings are arranged between an outer periphery of a shaft and an inner periphery of a hub and the hub is rotatably supported with respect to the shaft, the hub at a mounting position of the bearing. The inner diameter of the hub is set larger than the outer diameter of the bearing, and a part thereof is provided with a convex portion on the inner peripheral surface of the hub so as to be smaller than the outer diameter of the bearing, and the pair of convex portions is formed. A method of manufacturing a spindle motor for a magnetic disk, wherein the bearing is press-fitted into a hub having an adhesive applied inside the position and the bearing is shrink-fitted and interference-fitted with the convex portion, and the bearing is mounted inside the hub. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001022543A JP2002233099A (en) | 2001-01-31 | 2001-01-31 | Spindle motor for magnetic disk and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001022543A JP2002233099A (en) | 2001-01-31 | 2001-01-31 | Spindle motor for magnetic disk and its manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002233099A true JP2002233099A (en) | 2002-08-16 |
Family
ID=18887946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001022543A Pending JP2002233099A (en) | 2001-01-31 | 2001-01-31 | Spindle motor for magnetic disk and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002233099A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005341713A (en) * | 2004-05-27 | 2005-12-08 | Victor Co Of Japan Ltd | Motor with core |
| JP2009296759A (en) * | 2008-06-04 | 2009-12-17 | Alphana Technology Co Ltd | Motor and disk drive apparatus using the motor |
| JP2010205378A (en) * | 2009-03-06 | 2010-09-16 | Alphana Technology Co Ltd | Disk drive device |
-
2001
- 2001-01-31 JP JP2001022543A patent/JP2002233099A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005341713A (en) * | 2004-05-27 | 2005-12-08 | Victor Co Of Japan Ltd | Motor with core |
| JP4699710B2 (en) * | 2004-05-27 | 2011-06-15 | アルファナテクノロジー株式会社 | Core motor |
| JP2009296759A (en) * | 2008-06-04 | 2009-12-17 | Alphana Technology Co Ltd | Motor and disk drive apparatus using the motor |
| JP2010205378A (en) * | 2009-03-06 | 2010-09-16 | Alphana Technology Co Ltd | Disk drive device |
| US8564901B2 (en) | 2009-03-06 | 2013-10-22 | Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd | Disk drive device and method of press-fitting with reduced hub deformation |
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