JPH06315241A - Manufacture of spindle motor and bearing component - Google Patents
Manufacture of spindle motor and bearing componentInfo
- Publication number
- JPH06315241A JPH06315241A JP10276993A JP10276993A JPH06315241A JP H06315241 A JPH06315241 A JP H06315241A JP 10276993 A JP10276993 A JP 10276993A JP 10276993 A JP10276993 A JP 10276993A JP H06315241 A JPH06315241 A JP H06315241A
- Authority
- JP
- Japan
- Prior art keywords
- forming
- shaped bearing
- concave groove
- bearing member
- groove
- 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
Links
Landscapes
- Sliding-Contact Bearings (AREA)
- Motor Or Generator Frames (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、スピンドルモータお
よび軸受け用部品の製造方法に関し、特に、動圧軸受け
構造を採用したスピンドルモータおよび同軸受け構造部
品の製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a spindle motor and a bearing component, and more particularly to a method of manufacturing a spindle motor and a coaxial bearing structural component that employ a dynamic pressure bearing structure.
【０００２】[0002]
【従来の技術】磁気ディスク装置の回転駆動用のモータ
として、従来から、ブラシレス多相直流モータが用いら
れている。この種のモータはスピンドルモータとも呼ば
れ、基本的な構成として、励磁状態において電流磁界を
発生するステータコイルを備えたステータと、このステ
ータコイルの電流磁界との電磁相互作用により回転力を
得るロータマグネットを備えたロータとを有している。2. Description of the Related Art Conventionally, a brushless polyphase DC motor has been used as a motor for rotating a magnetic disk drive. This type of motor is also called a spindle motor, and as a basic configuration, a stator including a stator coil that generates a current magnetic field in an excited state, and a rotor that obtains a rotational force by electromagnetic interaction between the current magnetic field of the stator coil And a rotor provided with a magnet.
【０００３】このような構造のスピンドルモータでは、
近時、磁気ディスク装置の小型化に伴って、モータも小
型化が強く要請されており、この要請に応える技術とし
て、ステータとロータとの間に設けられる軸受け構造に
おいて、動圧軸受けを採用することが検討されている。
この動圧軸受けは、例えば、特開平３−６０３５５号公
報にその一例が開示されているように、ロータとステー
タとの周方向の摺接面に、ヘリングボーン状の溝を刻設
し、ロータが回転することにより、溝部分に充填されて
いる潤滑剤の圧力を高め、この圧力上昇により、ロータ
とステータとの間を離間させ、ラジアル方向の軸受け部
として機能させる。In the spindle motor having such a structure,
Recently, along with the downsizing of magnetic disk devices, there has been a strong demand for downsizing of motors. As a technology to meet this demand, a dynamic pressure bearing is adopted in the bearing structure provided between the stator and the rotor. Is being considered.
For example, as disclosed in Japanese Patent Laid-Open No. 3-60355, an example of this dynamic pressure bearing is that a herringbone-shaped groove is formed on a circumferential sliding contact surface between a rotor and a stator to form a rotor. Rotates, the pressure of the lubricant filled in the groove portion is increased, and this increase in pressure causes the rotor and the stator to be separated from each other, and functions as a radial bearing portion.
【０００４】また、スラスト方向の動圧軸受け部として
は、ロータの回転軸の端面側にスパイラル状の溝を設
け、回転軸の回転に伴うポンピング作用により、この部
分の圧力を高め、上昇した圧力により軸を浮上させるも
のである。しかしながら、このようなスピンドルモータ
の動圧軸受け部には、以下に説明する技術的課題があっ
た。Further, as a dynamic pressure bearing portion in the thrust direction, a spiral groove is provided on the end face side of the rotary shaft of the rotor, and the pumping action accompanying the rotation of the rotary shaft increases the pressure in this portion to raise the pressure. The axis is levitated by. However, such a dynamic pressure bearing portion of the spindle motor has the technical problems described below.
【０００５】[0005]
【発明が解決しようとする課題】すなわち、上述したス
ピンドルモータの動圧軸受け部では、ヘリングボーン状
ないしはスパイラル状の溝を刻設することになるが、こ
の溝の形成は、通常、化学的なエッチングにより行って
いたので、製作工程が複雑になり、製造コストが上昇す
るという問題があった。That is, in the above-mentioned dynamic pressure bearing portion of the spindle motor, a herringbone-shaped or spiral-shaped groove is engraved, but this groove is usually formed chemically. Since the etching is performed, there is a problem that the manufacturing process becomes complicated and the manufacturing cost increases.
【０００６】本発明は、このような問題点に鑑みてなさ
れたものであり、その目的とするところは、簡単な工程
により、安価に製造することができるスピンドルモータ
および軸受け部品の製造方法を提供することにある。The present invention has been made in view of the above problems, and an object of the present invention is to provide a spindle motor and a bearing component manufacturing method which can be manufactured at low cost by a simple process. To do.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するた
め、第１の発明は、励磁状態で電流磁界を発生するステ
ータコイルを備えた静止部材と、前記ステータコイルの
電流磁界との電磁相互作用により回転力を得るロータマ
グネットを備えた回転部材と、前記静止部材と回転部材
との間に設けられた動圧軸受け部とを有するスピンドル
モータにおいて、前記動圧軸受け部は、前記静止部材側
に設けられた円盤状軸受け部材に形成された凹状溝を有
し、前記円盤状軸受け部材は、その面上に前記凹状溝が
プレス加工により形成されることを特徴とする。In order to achieve the above object, a first invention is an electromagnetic interaction between a stationary member having a stator coil for generating a current magnetic field in an excited state, and the current magnetic field of the stator coil. In a spindle motor having a rotating member provided with a rotor magnet that obtains a rotating force and a dynamic pressure bearing portion provided between the stationary member and the rotating member, the dynamic pressure bearing portion is provided on the stationary member side. The disk-shaped bearing member is provided with a concave groove formed therein, and the disk-shaped bearing member is characterized in that the concave groove is formed on the surface thereof by press working.
【０００８】前記円盤状軸受け部材は、前記凹状溝が形
成される面に対応して、その外周縁に凹状の切欠部を設
けることができる。また、前記円盤状軸受け部材は、前
記凹状溝を形成する面が、半径方向内方に向けて、軸線
方向内方に傾斜したテーパー面に形成することができ
る。さらに、前記円盤状軸受け部材は、前記凹状溝を形
成する面が、当該凹状溝の形成中心から半径方向内外方
向に向けて、軸線方向外方に傾斜したテーパ面に形成す
ることができる。The disk-shaped bearing member may be provided with a concave cutout portion on the outer peripheral edge thereof in correspondence with the surface on which the concave groove is formed. Further, in the disc-shaped bearing member, a surface forming the concave groove may be formed as a taper surface inclined inward in the axial direction toward the inner side in the radial direction. Further, in the disc-shaped bearing member, the surface forming the concave groove may be formed as a tapered surface inclined inward in the radial direction from the center of formation of the concave groove and outward in the axial direction.
【０００９】また、第２の発明は、軸受け用部品の製造
方法として、円筒状の軸部と、この軸部から半径方向外
方に突出する円盤状軸受け部とを有する静止部材を形成
する工程と、前記円盤状軸受け部の少なくとも片面にプ
レス加工を施してスラスト軸受け用の凹状溝を形成する
工程とを含むことを特徴とする。前記軸受け用部品の製
造方法では、前記円盤状軸受け部材にプレス加工を施し
て、その両面に同時に前記凹状溝を形成することができ
る。また、前記静止部材を形成する工程と前記凹状溝を
形成する工程との間に、前記円盤状軸受け部の前記凹状
溝が形成される面の外周縁に凹状の切欠部を形成する工
程を設けることができる。A second aspect of the present invention is a method of manufacturing a bearing component, which includes a step of forming a stationary member having a cylindrical shaft portion and a disk-shaped bearing portion projecting radially outward from the shaft portion. And a step of forming a concave groove for thrust bearing by pressing at least one surface of the disk-shaped bearing portion. In the method of manufacturing the bearing component, the disc-shaped bearing member may be subjected to press working to simultaneously form the recessed grooves on both surfaces thereof. Further, between the step of forming the stationary member and the step of forming the concave groove, there is provided a step of forming a concave cutout portion on an outer peripheral edge of a surface of the disc-shaped bearing portion on which the concave groove is formed. be able to.
【００１０】さらに、前記静止部材を形成する工程と前
記凹状溝を形成する工程との間に、前記円盤状軸受け部
の前記凹状溝が形成される面を半径方向内方に向けて、
軸線方向内方に傾斜したテーパ面に形成する工程を設け
ることができる。さらにまた、前記静止部材を形成する
工程と前記凹状溝を形成する工程との間に、前記円盤状
軸受け部の前記凹状溝が形成される面を当該凹状溝の形
成中心から半径方向内外方向に向けて、軸線方向外方に
傾斜した面に形成する工程を設けることができる。Further, between the step of forming the stationary member and the step of forming the concave groove, the surface of the disc-shaped bearing portion on which the concave groove is formed is directed inward in the radial direction,
A step of forming a tapered surface inclined inward in the axial direction can be provided. Furthermore, between the step of forming the stationary member and the step of forming the recessed groove, the surface of the disk-shaped bearing portion on which the recessed groove is formed is moved radially inward and outward from the center of formation of the recessed groove. A step of forming a surface inclined outward in the axial direction can be provided.
【００１１】[0011]
【作用】上記構成のスピンドルモータによれば、動圧軸
受け部は、静止部材側に設けられた円盤状軸受け部材に
形成された凹状溝を有し、円盤状軸受け部材は、その面
上に前記凹状溝がプレス加工により形成されるので、こ
の凹状溝を容易に形成することができ、スピンドルモー
タを安価に提供することができる。また、請求項２の構
成によれば、円盤状軸受け部材と軸部とを別体に形成
し、円盤状軸受け部材を軸部に嵌着した状態で、プレス
加工を施すので、凹状溝をプレス成形する際に、円盤状
軸受け部材の軸部に嵌着された個所が、凹状溝の形成に
伴って、部分的に内方に膨出変形し、この膨出変形によ
り、円盤状軸受け部材が軸部に固設される。According to the spindle motor having the above structure, the dynamic pressure bearing portion has the concave groove formed in the disc-shaped bearing member provided on the stationary member side, and the disc-shaped bearing member has the above-mentioned surface on its surface. Since the concave groove is formed by press working, the concave groove can be easily formed, and the spindle motor can be provided at low cost. Further, according to the structure of claim 2, since the disc-shaped bearing member and the shaft portion are separately formed, and the disc-shaped bearing member is fitted in the shaft portion, press working is performed, so that the concave groove is pressed. At the time of molding, the portion fitted to the shaft portion of the disc-shaped bearing member partially bulges and deforms inward due to the formation of the concave groove, and the bulging deformation causes the disc-shaped bearing member to be deformed. It is fixed to the shaft.
【００１２】また、請求項３の構成によれば、円盤状軸
受け部材は、凹状溝が形成される面に対応して、その外
周縁に凹状の切欠部が設けられているので、この切欠部
が潤滑剤の溜部となるとともに、凹状溝をプレス成形す
る際の、軸受け部材の外周縁側の膨出変形が、切欠部の
形成部分でのみ発生し、軸受け部材の外周縁の有害な変
形が防止される。According to the third aspect of the present invention, the disc-shaped bearing member is provided with the concave cutout portion at the outer peripheral edge thereof corresponding to the surface on which the concave groove is formed. Becomes a reservoir for the lubricant, and bulging deformation on the outer peripheral edge side of the bearing member when press-forming the concave groove occurs only at the portion where the notch is formed, causing harmful deformation of the outer peripheral edge of the bearing member. To be prevented.
【００１３】さらに、請求項４または５の構成によれ
ば、円盤状軸受け部材は、凹状溝を形成する面が、半径
方向内方に向けて、軸線方向内方に傾斜したテーパー
面、もしくは、当該凹状溝の形成中心から半径方向内外
方向に向けて、軸線方向外方に傾斜した面に形成されて
いるので、凹状溝をプレス形成する際の、軸受け部材の
面方向の膨出変形が、これらのテーパー面で吸収され、
軸受け部材の有害な面変形が防止される。Further, according to the structure of claim 4 or 5, in the disc-shaped bearing member, the surface forming the concave groove is a tapered surface inclined inward in the axial direction toward the inner side in the radial direction, or Since it is formed on the surface inclined outward in the axial direction from the center of formation of the recessed groove in the radial direction inward and outward, bulging deformation in the surface direction of the bearing member during press forming of the recessed groove, Absorbed by these tapered surfaces,
The harmful surface deformation of the bearing member is prevented.
【００１４】[0014]
【実施例】以下本発明の好適な実施例について添附図面
を参照して詳細に説明する。図１から図３は、本発明に
かかるスピンドルモータの第１実施例を示している。同
図に示すスピンドルモータは、シャフト固定型の直流モ
ータであって、断面が概略凸形に形成された静止部材
（ステータ）１０と、断面が略ハット状に形成された回
転部材（ロータ）１１とを有している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. 1 to 3 show a first embodiment of a spindle motor according to the present invention. The spindle motor shown in the figure is a fixed shaft DC motor, and includes a stationary member (stator) 10 having a substantially convex cross section and a rotating member (rotor) 11 having a substantially hat cross section. And have.
【００１５】静止部材１０は、ブラケット１２と中心軸
部１３とから構成されている。ブラケット１２は、外周
に設けられたリング状のフランジ部１４と、このフラン
ジ部１４の内側に位置する外周壁部１５と、外周壁部１
５の内方に形成された環状の底部１６と、底部１６の内
周側に設けられた円筒状の内周壁部１７とを有してい
る。The stationary member 10 is composed of a bracket 12 and a central shaft portion 13. The bracket 12 includes a ring-shaped flange portion 14 provided on the outer periphery, an outer peripheral wall portion 15 located inside the flange portion 14, and an outer peripheral wall portion 1.
5 has an annular bottom portion 16 formed inward of the inner wall 5 and a cylindrical inner peripheral wall portion 17 provided on the inner peripheral side of the bottom portion 16.
【００１６】ブラケット１２の内周壁部１７の中心に
は、上下に貫通する円形断面の孔部１８が形成されてい
る。中心軸部１３は、上方に設けられた大径部１３ａ
と、下方に設けられた小径部１３ｂとを有し、孔部１８
内には、中心軸部１３の小径部１３の下端側が嵌着固定
されている。また、内周壁部１７の外周には、環状の積
層体からなるステータコア１９が固着され、ステータコ
ア１９には、ステータコイル２０が捲回されている。At the center of the inner peripheral wall portion 17 of the bracket 12, there is formed a hole portion 18 having a circular cross section that penetrates vertically. The central shaft portion 13 has a large diameter portion 13a provided above.
And a small-diameter portion 13b provided below the hole portion 18
The lower end side of the small diameter portion 13 of the central shaft portion 13 is fitted and fixed therein. A stator core 19 made of an annular laminate is fixed to the outer circumference of the inner peripheral wall portion 17, and a stator coil 20 is wound around the stator core 19.
【００１７】回転部材１１は、従来別部品で構成されて
いたスリーブを一体化したロータハブ２１を有してい
る。ロータハブ２１は、環状の基部２２と、基部２２の
下端外周縁に突設され、内周面に段部２３が形成された
中空筒部２４と、基部２２の外周に形成された環状壁部
２５と、環状壁部２５の外周に垂設された環状外壁部２
６と、環状外壁部２６の下端外周に周設された環状張出
部２７とを有している。The rotating member 11 has a rotor hub 21 in which a sleeve, which is conventionally formed as a separate component, is integrated. The rotor hub 21 has an annular base portion 22, a hollow cylindrical portion 24 protruding from the lower end outer peripheral edge of the base portion 22 and having a step portion 23 formed on the inner peripheral surface thereof, and an annular wall portion 25 formed on the outer periphery of the base portion 22. And the annular outer wall portion 2 vertically provided on the outer periphery of the annular wall portion 25.
6 and an annular projecting portion 27 that is provided around the lower end outer periphery of the annular outer wall portion 26.
【００１８】また、基部２２の中心には、これを上下方
向に貫通する貫通孔２８が形成され、この貫通孔２８内
には、前記中心軸部１３の大径部１３ａが挿通されてい
る。そして、ロータハブ２１の環状外壁部２６の内周面
には、環状のロータヨーク２９が、全高の略半分を下方
に突出するようにして固設されており、ロータヨーク２
９の内周面には、ステータコア１９に対向するようにし
てロータマグネット３０が固設されている。Further, a through hole 28 is formed in the center of the base portion 22 so as to penetrate therethrough in the vertical direction, and the large diameter portion 13a of the central shaft portion 13 is inserted into the through hole 28. An annular rotor yoke 29 is fixed to the inner peripheral surface of the annular outer wall portion 26 of the rotor hub 21 such that approximately half of the total height thereof projects downward.
A rotor magnet 30 is fixedly provided on the inner peripheral surface of 9 so as to face the stator core 19.
【００１９】ロータハブ２１の環状外壁部２６の外周に
は、円盤状の磁気ディスク３１が上下方向に所定の間隔
をおいて嵌着され、磁気ディスク３１は、環状壁部２５
に穿設されたネジ孔３２にビス３３を螺着することによ
り装着される取付金具３４により固定されている。ま
た、ブラケット１２は、磁気ディスク装置側の取付ベー
ス３５に接着固定されるとともに、中心軸部１３は、そ
の先端に形成された雄ネジ３６に磁気ディスク装置側の
カバー３７を挿入し、ナット３８を螺着することにより
固定される。A disk-shaped magnetic disk 31 is fitted on the outer periphery of the annular outer wall portion 26 of the rotor hub 21 at predetermined intervals in the vertical direction.
It is fixed by a mounting member 34 that is mounted by screwing a screw 33 into a screw hole 32 formed in the. Further, the bracket 12 is adhesively fixed to a mounting base 35 on the magnetic disk device side, and the central shaft portion 13 inserts a cover 37 on the magnetic disk device side into a male screw 36 formed at its tip, and a nut 38. It is fixed by screwing.
【００２０】なお、図１中において符号３９で示した部
材は、ステータコイル２０に直流電流を供給するフレキ
シブルプリント基板であり、また、同４０は、ネジ孔３
２を閉塞するシール部材、同４１は、防塵カバーであ
る。以上のように構成されたスピンドルモータでは、中
心軸部１３の大径部１３ａの外周面とロータハブ２１の
貫通孔２８の内周面とが摺接する部分が、潤滑剤を充填
したラジアル動圧軸受け部４２となるので、大径部１３
ａの外周面にヘリングボーン状溝４３が形成されてい
る。A member indicated by reference numeral 39 in FIG. 1 is a flexible printed circuit board for supplying a direct current to the stator coil 20, and a member 40 is a screw hole 3.
A seal member 41 for closing 2 is a dustproof cover. In the spindle motor configured as described above, the portion where the outer peripheral surface of the large diameter portion 13a of the central shaft portion 13 and the inner peripheral surface of the through hole 28 of the rotor hub 21 are in sliding contact is a radial dynamic pressure bearing filled with a lubricant. Since it becomes the portion 42, the large diameter portion 13
A herringbone-shaped groove 43 is formed on the outer peripheral surface of a.
【００２１】この実施例では、ヘリングボーン状溝４３
は、上下方向に所定の間隔をおいて２個所形成されてい
て、各ヘリングボーン状溝４３の中心は、図１に破線で
示すように、環状外壁部２５に装着される磁気ディスク
３１の厚み方向の中心軸と一致するように形成されてい
る。また、スラスト方向の動圧軸受け部４４は、中心軸
部１３の小径部１３ｂの上端に中心に透孔４５が形成さ
れた円盤状軸受け部材４６を固着し、この円盤状軸受け
部材４６の上下面にそれぞれヘリングボーン状の凹状溝
４７を形成し、円盤状軸受け部材４６の外周縁が段部２
３の内周面から僅かな間隔をおいて離間するようにし、
軸受け部材４６の下方に、段部２３に固着されたスラス
ト板４８を配置し、潤滑剤を充填することにより構成し
ている。In this embodiment, the herringbone-shaped groove 43 is formed.
Are formed at two positions in the vertical direction at a predetermined interval, and the center of each herringbone-shaped groove 43 is the thickness of the magnetic disk 31 mounted on the annular outer wall portion 25, as shown by the broken line in FIG. It is formed so as to coincide with the central axis of the direction. Further, the thrust-direction dynamic pressure bearing portion 44 is fixed to a disc-shaped bearing member 46 having a through hole 45 formed at the center at the upper end of the small diameter portion 13b of the central shaft portion 13, and the upper and lower surfaces of the disc-shaped bearing member 46 are fixed. A herringbone-shaped concave groove 47 is formed in each of the stepped portions 2.
It is separated from the inner peripheral surface of 3 with a slight distance,
A thrust plate 48 fixed to the step portion 23 is arranged below the bearing member 46, and is configured by filling a lubricant.
【００２２】図２は、円盤状軸受け部材４６に形成され
る凹状溝４７の詳細を示している。凹状溝４７は、図２
には現れていないが、軸受け部材４６の下面側にも形成
されており、略く字形に屈曲した形状を有し、軸受け部
材４６の内外周円に沿った円周上にあって、周方向に所
定の間隔をおいて複数形成されている。各凹状溝４７の
中心を結ぶ仮想円ｃは、軸受け部材４６の幅方向の中心
にほぼ位置している。このような凹状溝４７は、本実施
例では以下のようにして形成される。すなわち、凹状溝
４７は、円盤状軸受け部材４６を中心軸部１３の小径部
１３ｂに嵌着した状態で、軸受け部材４６の上下面に凹
状溝が形成されるような型を押圧するプレス加工によっ
て形成される。FIG. 2 shows details of the concave groove 47 formed in the disc-shaped bearing member 46. The concave groove 47 is shown in FIG.
Although not shown in the figure, it is also formed on the lower surface side of the bearing member 46, has a shape bent in a substantially V shape, is on the circumference along the inner and outer circumference circles of the bearing member 46, A plurality of them are formed at predetermined intervals. An imaginary circle c connecting the centers of the concave grooves 47 is located substantially at the center of the bearing member 46 in the width direction. Such a concave groove 47 is formed as follows in this embodiment. That is, the recessed groove 47 is formed by pressing the die in which the recessed groove is formed on the upper and lower surfaces of the bearing member 46 with the disc-shaped bearing member 46 fitted in the small diameter portion 13b of the central shaft portion 13. It is formed.
【００２３】このようにして、凹状溝４７をプレス加工
により形成すると、凹状溝４７をプレス成形する際に、
円盤状軸受け部材４６の中心軸部１３の小径部１３ｂに
嵌着された個所、すなわち、図３においてａで示す上下
２個所が、凹状溝４７の形成に伴って、部分的に内方に
膨出変形し、この膨出変形により、円盤状軸受け部材４
６が小径部１３ｂに強固に固設される。When the concave groove 47 is formed by pressing in this way, when the concave groove 47 is press-formed,
The portion fitted into the small diameter portion 13b of the central shaft portion 13 of the disk-shaped bearing member 46, that is, the two upper and lower portions shown by a in FIG. 3, partially expands inward as the concave groove 47 is formed. The disk-shaped bearing member 4 is deformed by the bulging deformation.
6 is firmly fixed to the small diameter portion 13b.
【００２４】さて、以上のように構成されたスピンドル
モータでは、フレキシブルプリント基板３９を介してス
テータコイル２０に所定の直流電流を供給すると、ステ
ータコイル２０により電流磁界が発生し、この電流磁界
とロータマグネット３０との間に電磁相互作用が発生
し、この作用力により回転部材１１が回転する。このと
き、ロータハブ２１の貫通孔２８の内周面と中心軸部１
３の大径部１３ａの外周面との間には、ラジアル動圧軸
受け部４２が設けられ、また、円盤状軸受け部材４６の
上面とロータハブ２１の基部２２の下端面との間、およ
び、円盤状軸受け部材４６の下面とスラスト板４８の上
面との間にスラスト動圧軸受け部４４がそれぞれ設けら
れているので、ロータハブ２１を円滑に回転させること
ができる。In the spindle motor configured as described above, when a predetermined direct current is supplied to the stator coil 20 via the flexible printed board 39, a current magnetic field is generated by the stator coil 20, and this current magnetic field and the rotor are generated. Electromagnetic interaction is generated between the magnet 30 and the rotary member 11 is rotated by this acting force. At this time, the inner peripheral surface of the through hole 28 of the rotor hub 21 and the central shaft portion 1
The radial dynamic pressure bearing portion 42 is provided between the outer peripheral surface of the large diameter portion 13a of No. 3 and the upper surface of the disc-shaped bearing member 46 and the lower end surface of the base portion 22 of the rotor hub 21, and the disc. Since the thrust dynamic pressure bearing portions 44 are respectively provided between the lower surface of the cylindrical bearing member 46 and the upper surface of the thrust plate 48, the rotor hub 21 can be smoothly rotated.
【００２５】この場合、本実施例のスピンドルモータで
は、特に、円盤状軸受け部材４６に形成される凹状溝４
７がプレス加工により形成され、しかも、プレス加工時
の放出変形により軸受け部材４６を中心軸部１３に固設
するので、簡単な工程により凹状溝４７を形成すること
ができるとともに、組み立て工程も簡略化することが可
能になる。In this case, in the spindle motor of this embodiment, the concave groove 4 formed in the disc-shaped bearing member 46 is particularly preferable.
7 is formed by press working, and furthermore, the bearing member 46 is fixedly mounted on the central shaft portion 13 by discharge deformation during press working, so that the concave groove 47 can be formed by a simple process and the assembling process is also simplified. Can be converted.
【００２６】なお、図示の例では、凹状溝４７の一端
（内側端）は、軸受け部材４６の内周縁近傍まで延び、
それらの他端は、軸受け部材４６の外周縁近傍まで延び
ているが、図４に示す通り、それらの他端を軸受け部材
４６の外周縁に到達するように延長形成することもでき
る。かく形成した場合には、軸受け部材４６の外周面と
ハブ２１の段部２３の内周面との間に存在する潤滑剤が
凹状溝４７に流入し易くなる。In the illustrated example, one end (inner end) of the concave groove 47 extends to the vicinity of the inner peripheral edge of the bearing member 46,
The other ends thereof extend to the vicinity of the outer peripheral edge of the bearing member 46, but as shown in FIG. 4, the other ends thereof can be extended so as to reach the outer peripheral edge of the bearing member 46. In this case, the lubricant existing between the outer peripheral surface of the bearing member 46 and the inner peripheral surface of the step portion 23 of the hub 21 easily flows into the concave groove 47.
【００２７】図５は、本発明にかかるスピンドルモータ
の第２実施例を示しており、以下にその特徴点について
のみ説明する。同図に示す実施例では、スラスト動圧軸
受け部４４の主構成部である円盤状軸受け部材４６ａに
は、ヘリングボーン状の凹状溝４７が形成される面に対
応させて、その外周縁に凹状の切欠部４９が形成されて
いる。FIG. 5 shows a second embodiment of the spindle motor according to the present invention, and only the characteristic points will be described below. In the embodiment shown in the figure, the disc-shaped bearing member 46a, which is the main component of the thrust dynamic pressure bearing portion 44, has a concave shape on the outer peripheral edge thereof corresponding to the surface on which the herringbone-shaped concave groove 47 is formed. The cutout portion 49 is formed.
【００２８】このように構成された円盤状軸受け部材４
６ａは、上記実施例と同様に中心軸部１３の小径部１３
ｂに嵌着した状態でプレス加工により凹状溝４７が形成
され、上記第１実施例と同等の作用効果が得られる。こ
のとき、凹状溝４７と切欠部４９とをプレス加工で同時
に形成することもできるが、まず、第１のプレス加工で
切欠部４９を形成し、しかる後に、第２のプレス加工で
凹状溝４７を形成するのが望ましい。The disk-shaped bearing member 4 thus constructed
6a is the small diameter portion 13 of the central shaft portion 13 as in the above embodiment.
The concave groove 47 is formed by pressing in the state of being fitted in b, and the same effect as the first embodiment can be obtained. At this time, the concave groove 47 and the notch portion 49 can be simultaneously formed by pressing, but first, the notch 49 is formed by the first pressing, and then the concave groove 47 is formed by the second pressing. Is preferably formed.
【００２９】本実施例の切欠部４９は、動圧軸受け用の
潤滑剤の溜部となるとともに、凹状溝４７をプレス成形
する際の、軸受け部材４６ａの外周縁側の膨出変形が、
切欠部４９の形成部分でのみ発生し、軸受け部材４６ａ
の外周縁の変形が切欠部４９により吸収される。このた
め、軸受け部材４６ａをモータに組み込んだ際に、軸受
け部材４６ａの外周縁と、段部２３の内周面との間隔が
異常に近接して、ロータハブ２１の円滑な回転が阻害さ
れることを防止することができる。The notch 49 of this embodiment serves as a reservoir for the lubricant for the dynamic pressure bearing, and the bulging deformation on the outer peripheral edge side of the bearing member 46a when the concave groove 47 is press-formed is
The bearing member 46a is generated only in the portion where the cutout portion 49 is formed.
The deformation of the outer peripheral edge of is absorbed by the notch portion 49. Therefore, when the bearing member 46a is incorporated in the motor, the distance between the outer peripheral edge of the bearing member 46a and the inner peripheral surface of the stepped portion 23 becomes abnormally close, and smooth rotation of the rotor hub 21 is hindered. Can be prevented.
【００３０】図６は、本発明にかかるスピンドルモータ
の第３実施例を示しており、以下にその特徴点について
のみ説明する。同図に示す実施例では、スラスト動圧軸
受け部４４の主構成部である円盤状軸受け部材４６ｂに
は、その上下面に、中心側（半径方向内方）に向かっ
て、軸線方向内方に傾斜するテーパ面５０が形成されて
いる。FIG. 6 shows a third embodiment of the spindle motor according to the present invention, and only the characteristic points will be described below. In the embodiment shown in the figure, the disc-shaped bearing member 46b, which is the main constituent part of the thrust dynamic pressure bearing portion 44, has its upper and lower surfaces directed toward the center side (inward in the radial direction) and inward in the axial direction. An inclined taper surface 50 is formed.
【００３１】このように構成された円盤状軸受け部材４
６ｂは、上記実施例と同様に中心軸部１３の小径部１３
ｂに嵌着した状態でプレス加工により凹状溝４７が形成
され、上記第１実施例と同等の作用効果が得られる。こ
のとき、テーパ面５０は、動圧軸受け用の潤滑剤の溜部
となるとともに、凹状溝４７をプレス成形する際の、軸
受け部材４６ｂの上下面側の膨出変形が、予め厚みを薄
くしているテーパ面５０の部分で発生し、軸受け部材４
６ｂの上下面の変形がテーパ面５０で吸収される。The disk-shaped bearing member 4 thus constructed
6b is a small diameter portion 13 of the central shaft portion 13 as in the above embodiment.
The concave groove 47 is formed by pressing in the state of being fitted in b, and the same effect as the first embodiment can be obtained. At this time, the tapered surface 50 serves as a lubricant reservoir for the dynamic pressure bearing, and the bulging deformation of the upper and lower surfaces of the bearing member 46b during press molding of the concave groove 47 reduces the thickness in advance. Is generated at the tapered surface 50, and the bearing member 4
The deformation of the upper and lower surfaces of 6b is absorbed by the tapered surface 50.
【００３２】このため、軸受け部材４６ｂをモータに組
み込んだ際に、軸受け部材４６ｂの上下面と、基部２２
の下端面およびスラスト板４８の上面との間隔が異常に
近接して、ロータハブ２１の円滑な回転が阻害されるこ
とを防止することができる。図７は、本発明にかかるス
ピンドルモータの第４実施例を示しており、以下にその
特徴点についてのみ説明する。同図に示す実施例では、
スラスト動圧軸受け部４４の主構成部である円盤状軸受
け部材４６ｃには、その上下面に、凹状溝４７の中心を
結ぶ仮想円ｃを中心として、半径方向内外方向に向かっ
て、軸線方向外方に傾斜するテーパ面５１，５２が形成
されている。Therefore, when the bearing member 46b is incorporated in the motor, the upper and lower surfaces of the bearing member 46b and the base portion 22 are formed.
It is possible to prevent the distance between the lower end surface of the rotor and the upper surface of the thrust plate 48 from approaching abnormally and hindering the smooth rotation of the rotor hub 21. FIG. 7 shows a fourth embodiment of the spindle motor according to the present invention, and only the characteristic points will be described below. In the embodiment shown in FIG.
The disk-shaped bearing member 46c, which is the main constituent part of the thrust dynamic pressure bearing portion 44, has an upper and lower surface centered on an imaginary circle c connecting the centers of the concave grooves 47, and radially outward and outward in the axial direction. Tapered surfaces 51 and 52 that are inclined toward one side are formed.
【００３３】このように構成された円盤状軸受け部材４
６ｃは、上記実施例と同様に中心軸部１３の小径部１３
ｂに嵌着した状態でプレス加工により凹状溝４７が形成
され、上記第１実施例と同等の作用効果が得られる。こ
のとき、テーパ面５１，５２は、動圧軸受け用の潤滑剤
の溜部となるとともに、凹状溝４７をプレス成形する際
の、軸受け部材４６ｃの上下面側の膨出変形が、予め厚
みを薄くしているテーパ面５１，２の部分で発生し、軸
受け部材４６ｃの上下面の変形がテーパ面５０で吸収さ
れる。The disk-shaped bearing member 4 thus constructed
6c is the small diameter portion 13 of the central shaft portion 13 as in the above embodiment.
The concave groove 47 is formed by pressing in the state of being fitted in b, and the same effect as the first embodiment can be obtained. At this time, the tapered surfaces 51 and 52 serve as a reservoir for the lubricant for the dynamic pressure bearing, and the bulging deformation on the upper and lower surfaces of the bearing member 46c at the time of press molding the concave groove 47 has a predetermined thickness. The tapered surfaces 50 absorb the deformation of the upper and lower surfaces of the bearing member 46c, which occurs at the thin tapered surfaces 51 and 2.
【００３４】このため、軸受け部材４６ｃをモータに組
み込んだ際に、図５に示した第３実施例と同様に、軸受
け部材４６ｃの上下面と、基部２２の下端面およびスラ
スト板４８の上面との間隔が異常に近接して、ロータハ
ブ２１の円滑な回転が阻害されることを防止することが
できる。なお、上記実施例では、軸受け部材４６と中心
軸部１３とを別体に形成した場合を例示したが、凹状溝
４７を形成するためのプレス加工は、中心軸部１３と軸
受け部材４６を一体に形成したものにも適用することが
でき、このときにもプレス加工によって凹状溝４７を所
望の通りに形成することができる。また、上記実施例で
は、ラジアル動圧軸受け部４２のヘリングボーン溝４３
を中心軸部１３の外周面に形成したものを例示したが、
この溝４３は基部２２の貫通孔２８の内周面に形成して
もよい。Therefore, when the bearing member 46c is incorporated into the motor, the upper and lower surfaces of the bearing member 46c, the lower end surface of the base portion 22 and the upper surface of the thrust plate 48, as in the third embodiment shown in FIG. It is possible to prevent that the interval of (1) becomes abnormally close and smooth rotation of the rotor hub 21 is hindered. In the above embodiment, the case where the bearing member 46 and the central shaft portion 13 are formed separately is illustrated, but the press work for forming the concave groove 47 is performed by integrally forming the central shaft portion 13 and the bearing member 46. The concave groove 47 can also be formed as desired by pressing. Further, in the above embodiment, the herringbone groove 43 of the radial dynamic pressure bearing portion 42 is used.
Although the one formed on the outer peripheral surface of the central shaft portion 13 is illustrated,
The groove 43 may be formed on the inner peripheral surface of the through hole 28 of the base portion 22.
【００３５】さらに、中心軸部１３を貫通孔２８に固着
し、中心軸部１３の小径部１３ｂの外周面とブラケット
１２の孔部１８の内周面との間にラジアル動圧軸受け部
を設け、軸回転型のスピンドルモータとした場合にも本
発明を適用することができる。また、実施例では、軸受
け部材４６の両面に凹状溝４７を設けているが、少なく
ともその片面に凹状溝４７を設けることによってスラス
ト軸受けとして機能させることができる。Further, the central shaft portion 13 is fixed to the through hole 28, and a radial dynamic pressure bearing portion is provided between the outer peripheral surface of the small diameter portion 13b of the central shaft portion 13 and the inner peripheral surface of the hole portion 18 of the bracket 12. The present invention can be applied to the case of a shaft rotation type spindle motor. Further, in the embodiment, the concave groove 47 is provided on both surfaces of the bearing member 46, but by providing the concave groove 47 on at least one surface thereof, it is possible to function as a thrust bearing.
【００３６】[0036]
【発明の効果】以上、実施例で詳細に説明したように、
本発明にかかるスピンドルモータおよび軸受け用部品の
製造方法によれば、動圧軸受け部の凹状溝がプレス加工
により形成されるので、工程が簡単になり、しかも、こ
の凹状溝のプレス加工を利用して軸受け部材の固設が行
えるので、製造工程の簡略化とコストの低減とが可能に
なる。As described above in detail in the embodiments,
According to the method of manufacturing the spindle motor and the bearing component of the present invention, since the concave groove of the dynamic pressure bearing portion is formed by press working, the process is simplified, and the press working of the concave groove is utilized. Since the bearing member can be fixedly installed, the manufacturing process can be simplified and the cost can be reduced.
【図１】本発明にかかるスピンドルモータの第１実施例
を示す断面図である。FIG. 1 is a sectional view showing a first embodiment of a spindle motor according to the present invention.
【図２】図１の円盤状軸受け部材の斜視図である。FIG. 2 is a perspective view of the disc-shaped bearing member of FIG.
【図３】図２に示した軸受け部材を軸部に固着した状態
の断面説明図である。3 is a cross-sectional explanatory view of a state where the bearing member shown in FIG. 2 is fixed to a shaft portion.
【図４】円盤状軸受け部材の変形例を示す斜視図であ
る。FIG. 4 is a perspective view showing a modified example of a disc-shaped bearing member.
【図５】本発明にかかるスピンドルモータの第２実施例
を示す要部断面図である。FIG. 5 is a sectional view of an essential part showing a second embodiment of the spindle motor according to the present invention.
【図６】本発明にかかるスピンドルモータの第３実施例
を示す要部断面図である。FIG. 6 is a cross-sectional view of essential parts showing a third embodiment of the spindle motor according to the present invention.
【図７】本発明にかかるスピンドルモータの第４実施例
を示す要部断面図である。FIG. 7 is a cross-sectional view of essential parts showing a fourth embodiment of the spindle motor according to the present invention.
１０ 静止部材 １１ 回転部材 １２ ブラケット １３ 中心軸部 １３ａ 大径部 １３ｂ 小径部 １９ ステータコア ２０ ステータコイル ２１ ロータハブ ２９ ロータヨーク ３０ ロータマグネット ３１ 磁気ディスク ４２ ラジアル動圧軸受け部 ４３ ヘリングボーン状溝 ４４ スラスト動圧軸受け部 ４６ 円盤状軸受け部材 ４７ 凹状溝 ４９ 切欠部 ５０ テーパ面 10 stationary member 11 rotating member 12 bracket 13 central shaft portion 13a large diameter portion 13b small diameter portion 19 stator core 20 stator coil 21 rotor hub 29 rotor yoke 30 rotor magnet 31 magnetic disk 42 radial dynamic pressure bearing portion 43 herringbone groove 44 thrust thrust pressure bearing Part 46 Disc-shaped bearing member 47 Concave groove 49 Notch part 50 Tapered surface
Claims (10)
コイルを備えた静止部材と、前記ステータコイルの電流
磁界との電磁相互作用により回転力を得るロータマグネ
ットを備えた回転部材と、前記静止部材と回転部材との
間に設けられた動圧軸受け部とを有するスピンドルモー
タにおいて、 前記動圧軸受け部は、前記静止部材側に設けられた円盤
状軸受け部材に形成された凹状溝を有し、 前記円盤状軸受け部材は、前記凹状溝がプレス加工によ
り形成されることを特徴とするスピンドルモータ。1. A stationary member including a stator coil that generates a current magnetic field in an excited state, a rotating member including a rotor magnet that obtains a rotational force by electromagnetic interaction with the current magnetic field of the stator coil, and the stationary member. In a spindle motor having a dynamic pressure bearing portion provided between the rotary member and the rotary member, the dynamic pressure bearing portion has a concave groove formed in the disk-shaped bearing member provided on the stationary member side, In the disc-shaped bearing member, the concave groove is formed by press working.
体に形成され、前記軸部に嵌着した状態でその面上に前
記凹上溝がプレス加工により形成されることを特徴とす
る請求項１記載のスピンドルモータ。2. The disc-shaped bearing member is formed separately from the shaft portion, and the concave upper groove is formed by press working on the surface of the disc-shaped bearing member in a state of being fitted to the shaft portion. The spindle motor according to claim 1.
形成される面に対応して、その外周縁に凹状の切欠部が
設けられていることを特徴とする請求項１または２記載
のスピンドルモータ。3. The disk-shaped bearing member according to claim 1, wherein a concave cutout is provided on an outer peripheral edge of the disk-shaped bearing member corresponding to a surface on which the concave groove is formed. Spindle motor.
形成する面が、半径方向内方に向けて、軸線方向内方に
傾斜したテーパー面に形成されていることを特徴とする
請求項１ないし３のいずれか１記載のスピンドルモー
タ。4. The disk-shaped bearing member is characterized in that a surface forming the concave groove is formed as a taper surface inclined inward in the axial direction toward the inner side in the radial direction. The spindle motor according to any one of 1 to 3.
形成する面が、当該凹状溝の形成中心から半径方向内外
方向に向けて、軸線方向外方に傾斜した面に形成されて
いることを特徴とする請求項１ないし３のいずれか１記
載のスピンドルモータ。5. The disc-shaped bearing member is such that a surface forming the concave groove is formed in a surface inclined axially outward from a center of formation of the concave groove inward and outward in the radial direction. The spindle motor according to any one of claims 1 to 3, characterized in that:
外方に突出する円盤状軸受け部とを有する静止部材を形
成する工程と、 前記円盤状軸受け部の少なくとも片面にプレス加工を施
してスラスト軸受け用の凹状溝を形成する工程とを含む
ことを特徴とする軸受け用部品の製造方法。6. A step of forming a stationary member having a cylindrical shaft portion and a disc-shaped bearing portion protruding outward in the radial direction from the shaft portion, and press working on at least one surface of the disc-shaped bearing portion. And a step of forming a concave groove for thrust bearing, the method for manufacturing a bearing component.
して、その両面に同時に前記凹状溝を形成することを特
徴とする請求項６記載の軸受け用部品の製造方法。7. The method of manufacturing a bearing component according to claim 6, wherein the disc-shaped bearing member is subjected to press working to simultaneously form the recessed grooves on both surfaces thereof.
溝を形成する工程との間に、前記円盤状軸受け部の前記
凹状溝が形成される面の外周縁に凹状の切欠部を形成す
る工程を設けることを特徴とする請求項６または７記載
の軸受け用部品の製造方法。8. A concave notch is formed on an outer peripheral edge of a surface of the disk-shaped bearing portion on which the concave groove is formed, between the step of forming the stationary member and the step of forming the concave groove. The method for manufacturing a bearing component according to claim 6 or 7, wherein a step is provided.
溝を形成する工程との間に、前記円盤状軸受け部の前記
凹状溝が形成される面を半径方向内方に向けて、軸線方
向内方に傾斜したテーパ面に形成する工程を設けること
を特徴とする請求項６または７記載の軸受け用部品の製
造方法。9. Between the step of forming the stationary member and the step of forming the recessed groove, the surface of the disk-shaped bearing portion on which the recessed groove is formed is directed inward in the radial direction, and the axial direction is set. 8. The method of manufacturing a bearing component according to claim 6, further comprising a step of forming a tapered surface that is inclined inward.
状溝を形成する工程との間に、前記円盤状軸受け部の前
記凹状溝が形成される面を当該凹状溝の形成中心から半
径方向内外方向に向けて、軸線方向外方に傾斜した面に
形成する工程を設けることを特徴とする求項６または７
記載の軸受け用部品の製造方法。10. Between the step of forming the stationary member and the step of forming the recessed groove, the surface of the disk-shaped bearing portion on which the recessed groove is formed is radially inward and outward from the center of formation of the recessed groove. 6 or 7, wherein a step of forming a surface inclined outward in the axial direction toward the direction is provided.
A method for manufacturing the bearing component described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10276993A JP3338117B2 (en) | 1993-04-28 | 1993-04-28 | Method of manufacturing spindle motor and bearing parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10276993A JP3338117B2 (en) | 1993-04-28 | 1993-04-28 | Method of manufacturing spindle motor and bearing parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06315241A true JPH06315241A (en) | 1994-11-08 |
| JP3338117B2 JP3338117B2 (en) | 2002-10-28 |
Family
ID=14336378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10276993A Expired - Fee Related JP3338117B2 (en) | 1993-04-28 | 1993-04-28 | Method of manufacturing spindle motor and bearing parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3338117B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001086703A (en) * | 2000-07-31 | 2001-03-30 | Hitachi Ltd | Spindle motor |
| JP2003307267A (en) * | 2002-04-12 | 2003-10-31 | Koyo Seiko Co Ltd | Cam follower |
| US7946770B2 (en) | 2002-10-24 | 2011-05-24 | Ntn Corporation | Hydrodynamic bearing device |
| DE102011085681A1 (en) * | 2011-11-03 | 2013-05-08 | Abb Turbo Systems Ag | Hydrodynamic thrust bearing |
| US8506167B2 (en) | 2004-03-30 | 2013-08-13 | Ntn Corporation | Dynamic bearing device having a thrust bearing portion |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4590898B2 (en) * | 2003-03-31 | 2010-12-01 | パナソニック株式会社 | Spindle motor and disk drive device |
-
1993
- 1993-04-28 JP JP10276993A patent/JP3338117B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001086703A (en) * | 2000-07-31 | 2001-03-30 | Hitachi Ltd | Spindle motor |
| JP2003307267A (en) * | 2002-04-12 | 2003-10-31 | Koyo Seiko Co Ltd | Cam follower |
| US7946770B2 (en) | 2002-10-24 | 2011-05-24 | Ntn Corporation | Hydrodynamic bearing device |
| US8506167B2 (en) | 2004-03-30 | 2013-08-13 | Ntn Corporation | Dynamic bearing device having a thrust bearing portion |
| DE102011085681A1 (en) * | 2011-11-03 | 2013-05-08 | Abb Turbo Systems Ag | Hydrodynamic thrust bearing |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3338117B2 (en) | 2002-10-28 |
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