JPH02280645A - Bearing structure - Google Patents
Bearing structureInfo
- Publication number
- JPH02280645A JPH02280645A JP10024889A JP10024889A JPH02280645A JP H02280645 A JPH02280645 A JP H02280645A JP 10024889 A JP10024889 A JP 10024889A JP 10024889 A JP10024889 A JP 10024889A JP H02280645 A JPH02280645 A JP H02280645A
- Authority
- JP
- Japan
- Prior art keywords
- metal ball
- transfer groove
- rotor
- section
- thrust bearing
- 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
- 239000002184 metal Substances 0.000 claims abstract description 65
- 238000005096 rolling process Methods 0.000 claims description 2
- 239000000758 substrate Substances 0.000 abstract description 5
- 230000002265 prevention Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 2
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Motor Or Generator Frames (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、磁気ディスク駆動装置等に用いられる薄型モ
ータ等に少了適な軸受構造に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bearing structure that is somewhat suitable for thin motors used in magnetic disk drives and the like.
第４図はこの種軸受構造の従来例を説明するための薄型
モータの概略断面図である。FIG. 4 is a schematic sectional view of a thin motor for explaining a conventional example of this type of bearing structure.
同図において、磁気ディスクのハブ（図示せず）と係合
するための駆動ビン２を設けた回転体の一部をなすター
ンテーブルｌは、その中央に回転軸としての中心軸３が
固定されていて、このターンテーブル１の垂下部分の外
側には、磁石５を固着した回転部材としてのロータ４が
固定されている。In the figure, a turntable l forming part of a rotating body is provided with a drive pin 2 for engaging with a hub (not shown) of a magnetic disk, and a central shaft 3 serving as a rotating shaft is fixed at the center of the turntable l. A rotor 4 serving as a rotating member to which magnets 5 are fixed is fixed to the outside of the hanging portion of the turntable 1.
一方、固定部材としてのステータは、基板６の上記磁石
５と対向する位置に配設された電磁コイル７を含み、上
記基板６の環状突起６ａの内側に固定した筒状の含油メ
タル８の内部に上記中心軸３が回転自在に嵌挿されてい
る。また、上記ロータ４の内周部と、上記基＋Ｉｉ、６
の環状突起６ａの周囲の受部６ｂとの間には、スラスト
荷重を受けるスラスト軸受９が設けられている。このス
ラスト軸受９は、金属球１０を断面略Ｕ字形の上下の金
属球転送溝９ａ、９ｂの中で転勤させて構成されている
。なお、図中の符号１１は金属製のカバーで、磁気シー
ルド板を兼ねている。On the other hand, the stator as a fixed member includes an electromagnetic coil 7 disposed on the substrate 6 at a position facing the magnet 5, and is inside a cylindrical oil-impregnated metal 8 fixed inside the annular projection 6a of the substrate 6. The central shaft 3 is rotatably fitted into the shaft. Further, the inner circumferential portion of the rotor 4 and the group +Ii, 6
A thrust bearing 9 that receives a thrust load is provided between the annular projection 6a and the surrounding receiving portion 6b. This thrust bearing 9 is constructed by displacing metal balls 10 in upper and lower metal ball transfer grooves 9a and 9b having a substantially U-shaped cross section. Note that the reference numeral 11 in the figure is a metal cover, which also serves as a magnetic shield plate.
ところで、上記したスラスト軸受９で金属球１０を転が
すためには、断面略Ｕ字形の金属球転送溝９ａ、９ｂの
曲率半径を金属球１０の半径よりも大きく設定しなけれ
ばならないが、このような構造では金属球１０の軌道が
不安定になるため、ターンテーブル１やロータ４に面ぶ
れや回転むらが起こりやすいという不具合があった。ま
た、含油メタル８を固定したステータ例の金属球転送溝
９ｂは、含油メタル８の内部に嵌挿される中心軸３との
同芯度が出しにくいので、金属球１０の軌道を高精度に
設定することが困難となり、この点からも面ぶれや回転
むらを起こしやすい構造であった。By the way, in order to roll the metal ball 10 with the above-mentioned thrust bearing 9, the radius of curvature of the metal ball transfer grooves 9a and 9b, which have a substantially U-shaped cross section, must be set larger than the radius of the metal ball 10. In such a structure, the orbit of the metal ball 10 becomes unstable, which causes problems in that the turntable 1 and the rotor 4 are likely to run out of plane or rotate unevenly. Furthermore, since it is difficult to achieve concentricity with the central shaft 3 that is inserted into the inside of the oil-impregnated metal 8 in the metal ball transfer groove 9b of the stator example in which the oil-impregnated metal 8 is fixed, the trajectory of the metal ball 10 is set with high precision. From this point of view, the structure was prone to surface runout and uneven rotation.
したがって本発明の目的とするところは、上記従来技術
の課題を解消し、ロータとステータ間に介在させる金属
球の軌道が安定して中心軸との同芯度も高く、面ぶれや
回転むらが防止できる薄型回転体の軸受構造を提供する
ことにある。Therefore, it is an object of the present invention to solve the above-mentioned problems of the prior art, and to ensure that the trajectory of the metal balls interposed between the rotor and stator is stable and highly concentric with the central axis, and that surface runout and uneven rotation are avoided. An object of the present invention is to provide a bearing structure for a thin rotating body that can prevent the above problems.
上記目的を達成するために、本発明は、含油メタルを介
して回転軸を回転自在に支持する固定部材と、この固定
部材に対向配置されて上記回転軸と一体に回転する回転
部材と１、：の回転部材と上記固定部材との間に金属球
を介在させてスラスト荷重を受けるスラスト軸受とを備
えた回転体の軸受構造において、上記スラスト軸受の上
記回転部材側で上記金属球との対向面に、この金属球と
２点で転接する断面略Ｖ字形の金属球転送溝を設ける構
成とした。In order to achieve the above object, the present invention provides a fixing member that rotatably supports a rotating shaft via an oil-impregnated metal, a rotating member that is arranged opposite to the fixing member and rotates integrally with the rotating shaft; : In a bearing structure for a rotating body comprising a thrust bearing that receives a thrust load by interposing a metal ball between the rotating member and the fixed member, the thrust bearing faces the metal ball on the rotating member side. A metal ball transfer groove having a substantially V-shaped cross section is provided on the surface to make rolling contact with the metal ball at two points.
一ヒ記の如くに構成すると、回転部材側の断面略Ｖ字形
の金属球転送溝と金属球との接触ラインが２本となるた
め、金属球の軌道が安定化し、また、固定部材側は平坦
面で金属球を受けることができるので、回転軸との芯ず
れを懸念する必要がなくなる。With the configuration as described in 1), since there are two contact lines between the metal ball transfer groove having a roughly V-shaped cross section on the rotating member side and the metal ball, the trajectory of the metal ball is stabilized, and the fixed member side Since the metal ball can be received on a flat surface, there is no need to worry about misalignment with the rotation axis.
以下、本発明の実施例を図に基づいて説明する。 Embodiments of the present invention will be described below based on the drawings.
第１図は本発明の一実施例に係る軸受＋ｇ造を示す薄型
モータの概略断面図、第２図はその要部説明図で、第４
図と対応する部分には同一符号を付し、重複する説明は
適宜省略する。Fig. 1 is a schematic sectional view of a thin motor showing a bearing + g construction according to an embodiment of the present invention, Fig. 2 is an explanatory view of the main parts thereof, and Fig. 4
Portions corresponding to those in the figures are given the same reference numerals, and overlapping explanations will be omitted as appropriate.
第１，２図において、ロータ４の内周部と基板６の受部
６ｂとの間に介在するスラスト軸受９は、中心軸３に嵌
合せしめたロータ４側に断面略Ｖ字形の金属球転送溝９
Ｃが形成してあり、ステータ側（基板６側）で金属球１
０と接触する面は平坦面９ｄとなっている。つまり、金
属球転送溝９Ｃを画成する内外２つのテーパ面がそれぞ
れ金属球１０に当接して２本の接触ラインが得られ、こ
の金属球転送溝９Ｃの中で転勤する金属球１０の軌道が
安定化することから、このスラスト軸受９のステータ側
の部分は金属球１０との接触面（スラスト荷重を受ける
面）が平坦であっても支障はない。そして、このスラス
ト軸受９のロータ４側は中心軸３と一体なので金属球転
送溝９ｃの同芯度を出すことは容易であり、一方、筒状
の含油メタル８を介して中心軸３を回転自在に支持する
ステータ側には金属球転送１を設ける必要がなく、よっ
て従来問題とされていた中心軸３との芯ずれを懸念する
必要がなくなり、金属球１０の軌道を高精度に設定する
ことが可能となっている。In FIGS. 1 and 2, the thrust bearing 9 interposed between the inner peripheral part of the rotor 4 and the receiving part 6b of the substrate 6 is a metal ball having a substantially V-shaped cross section on the side of the rotor 4 fitted to the central shaft 3. Transfer groove 9
A metal ball 1 is formed on the stator side (substrate 6 side).
The surface in contact with 0 is a flat surface 9d. In other words, the two inner and outer tapered surfaces defining the metal ball transfer groove 9C contact the metal ball 10 to form two contact lines, and the trajectory of the metal ball 10 transferring in the metal ball transfer groove 9C. is stabilized, there is no problem even if the contact surface of the stator side portion of the thrust bearing 9 with the metal ball 10 (the surface receiving the thrust load) is flat. Since the rotor 4 side of this thrust bearing 9 is integrated with the central shaft 3, it is easy to achieve concentricity of the metal ball transfer groove 9c, and on the other hand, the central shaft 3 is rotated through the cylindrical oil-impregnated metal 8. There is no need to provide the metal ball transfer 1 on the freely supported stator side, so there is no need to worry about misalignment with the central axis 3, which was a problem in the past, and the trajectory of the metal ball 10 can be set with high precision. It is now possible.
また、第２図に明らかなように、金属球転送溝９ｃを画
成する内側のテーパ面が外側のテーパ面よりも急勾配に
しであるので、金属球転送溝９ｃに沿って円運動する金
属球１０の回転抵抗は小さく、円滑に金属球１０を転勤
させることが可能となっている。Furthermore, as is clear from FIG. 2, since the inner tapered surface defining the metal ball transfer groove 9c has a steeper slope than the outer tapered surface, the metal ball that moves circularly along the metal ball transfer groove 9c The rotational resistance of the ball 10 is small, making it possible to smoothly transfer the metal ball 10.
その他、この１型モータの特に説明しない部分の構成は
、第４図に示した従来品と同等である。Other parts of this type 1 motor that are not specifically explained are the same as the conventional product shown in FIG.
このように、上記実施例にあっては、金属球１゜を挟ん
でスラスト軸受９のロータ４側に断面略Ｖ字形の金属球
転送＞４９ｃを設け、ステータ側は平坦面９ｄとしであ
るので、中心軸３との芯ずれのない安定した軌道で金属
球１０を円滑に転勤させることができ、ターンテーブル
１やロータ４に面ぶれや回転むらが起こりにくい軸受構
造が実現されている。As described above, in the above embodiment, a metal ball transfer>49c having a substantially V-shaped cross section is provided on the rotor 4 side of the thrust bearing 9 with the metal ball 1° in between, and the stator side is a flat surface 9d. A bearing structure is realized in which the metal ball 10 can be smoothly transferred on a stable trajectory without misalignment with the center axis 3, and the turntable 1 and the rotor 4 are less likely to run out or rotate unevenly.
第３図は本発明の他の実施例に係る軸受構造を示す薄型
モータの概略断面図であって、ロータ４がスラスト軸受
９の一方にネジ１２止めされておリ、このロータ４とス
テータ（基半反６および電磁コイル７）との位置関係が
先の実施例と逆になっている。FIG. 3 is a schematic sectional view of a thin motor showing a bearing structure according to another embodiment of the present invention, in which the rotor 4 is fixed with a screw 12 to one side of the thrust bearing 9, and the rotor 4 and the stator ( The positional relationship with the base plate 6 and the electromagnetic coil 7) is opposite to that of the previous embodiment.
なお、上述した各実施例ではいずれも、スラスト軸受９
のステータ側の平坦面９ｄに金属球ｌＯを当接させてい
るが、ステータ側に底面が平坦で幅広な凹溝を形成して
おき、この底面に金属球１０を当接させるようにしても
よい。また、金属球転送１９Ｃが形成されるスラスト軸
受９のロータ４側の部分を中心軸３と一体成形してもよ
い。In addition, in each of the above-mentioned embodiments, the thrust bearing 9
The metal ball 10 is brought into contact with the flat surface 9d on the stator side, but a wide concave groove with a flat bottom is formed on the stator side, and the metal ball 10 is brought into contact with this bottom surface. good. Further, the portion of the thrust bearing 9 on the rotor 4 side where the metal ball transfer 19C is formed may be integrally molded with the central shaft 3.
また、上記実施例では、いずれもモータに適用された軸
受構造を例示しているが、この構造はモータだけに使用
されるものではなく、同様の回転体の支持構造として広
く適用できることはいうまでもない。In addition, although the above embodiments all illustrate bearing structures applied to motors, it goes without saying that this structure is not only used for motors, but can also be widely applied as a support structure for similar rotating bodies. Nor.
以上説明したように、本発明は、スラスト軸受の回転部
材側で金属球との対向面に断面路■字形の金属球転送溝
が設けであるので、金、１球の軌道が安定化するととも
に、固定部材側に金属球転送溝を設ける必要がなくなっ
て金底球の軌道を高精度に設定することが可能となり、
よって回転体に面ぶれや回転むらが起こりにくい優れた
軸受構造を提供することができる。As explained above, in the present invention, a metal ball transfer groove with a cross-sectional shape of 1 is provided on the surface facing the metal ball on the rotating member side of the thrust bearing, so that the trajectory of the single ball is stabilized and It is no longer necessary to provide a metal ball transfer groove on the fixed member side, making it possible to set the trajectory of the gold-bottomed ball with high precision.
Therefore, it is possible to provide an excellent bearing structure in which surface runout and uneven rotation are less likely to occur in the rotating body.
第１図は本発明の一実施例に係る軸受構造を示す薄型モ
ータの概略断面図、第２図はその要部説明図、第３図は
本発明の他の実施例に係る軸受構造を示す薄型モータの
概略断面図、第４図は従来例に係る軸受構造を示す１型
モータの概略断面図である。
１・・・・・・・・・ターンテーブル、３・・・・・・
・・・中心軸、４・・・・・・・・・ロータ、５・・・
・・・・・・磁石、６・・・・・・・・・基ヰ反、７・
・・・・・・・・電磁コイル、８・・・・・・・・・含
油メタル、９・・・・・・・・・スラスト軸受、９Ｃ・
・・・・・・・・金属球転送溝、９ｄ・・・・・・・・
・平坦面、１０・・・・・・・・・金属球。
第１囚
第３区
′Ｉａ２ｒｇＪ
第４図Fig. 1 is a schematic sectional view of a thin motor showing a bearing structure according to an embodiment of the present invention, Fig. 2 is an explanatory diagram of its main parts, and Fig. 3 shows a bearing structure according to another embodiment of the invention. Schematic sectional view of a thin motor. FIG. 4 is a schematic sectional view of a type 1 motor showing a bearing structure according to a conventional example. 1...Turntable, 3...
...Central axis, 4...Rotor, 5...
・・・・・・Magnet, 6・・・・・・・Basic resistance, 7・
...... Electromagnetic coil, 8... Oil-impregnated metal, 9... Thrust bearing, 9C.
......Metal ball transfer groove, 9d...
・Flat surface, 10...Metal ball. 1st Prisoner, Ward 3'Ia2rgJ Figure 4
Claims (1)
材と、この固定部材に対向配置されて上記回転軸と一体
に回転する回転部材と、この回転部材と上記固定部材と
の間に金属球を介在させてスラスト荷重を受けるスラス
ト軸受とを備えた回転体の軸受構造において、上記スラ
スト軸受の上記回転部材側の上記金属球との対向面に、
この金属球と２点で転接する断面略Ｖ字形の金属球転送
溝を設けたことを特徴とする軸受構造。A fixed member that rotatably supports a rotating shaft via an oil-impregnated metal, a rotating member that is placed opposite to this fixed member and rotates together with the rotating shaft, and a metal ball between this rotating member and the fixed member. In a bearing structure for a rotating body including a thrust bearing that receives a thrust load with a
A bearing structure characterized in that a metal ball transfer groove having a substantially V-shaped cross section is provided in rolling contact with the metal ball at two points.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10024889A JPH02280645A (en) | 1989-04-21 | 1989-04-21 | Bearing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10024889A JPH02280645A (en) | 1989-04-21 | 1989-04-21 | Bearing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02280645A true JPH02280645A (en) | 1990-11-16 |
Family
ID=14268934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10024889A Pending JPH02280645A (en) | 1989-04-21 | 1989-04-21 | Bearing structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02280645A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4216489A1 (en) * | 1991-05-20 | 1992-11-26 | Teac Corp | Package motor for magnetic disc drive - has rotor with plate supporting magnets and having formed recess profile to improve stiffness |
| US6002188A (en) * | 1997-05-15 | 1999-12-14 | Sanyo Electric Co., Ltd. | Motor bearing arrangement and electric motor using the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63148846A (en) * | 1986-12-12 | 1988-06-21 | Copal Electron Co Ltd | Bearing mechanism for motor |
-
1989
- 1989-04-21 JP JP10024889A patent/JPH02280645A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63148846A (en) * | 1986-12-12 | 1988-06-21 | Copal Electron Co Ltd | Bearing mechanism for motor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4216489A1 (en) * | 1991-05-20 | 1992-11-26 | Teac Corp | Package motor for magnetic disc drive - has rotor with plate supporting magnets and having formed recess profile to improve stiffness |
| US6002188A (en) * | 1997-05-15 | 1999-12-14 | Sanyo Electric Co., Ltd. | Motor bearing arrangement and electric motor using the same |
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