JPH10309061A - Motor with hydrodynamic bearing - Google Patents

Motor with hydrodynamic bearing

Info

Publication number
JPH10309061A
JPH10309061A JP12628097A JP12628097A JPH10309061A JP H10309061 A JPH10309061 A JP H10309061A JP 12628097 A JP12628097 A JP 12628097A JP 12628097 A JP12628097 A JP 12628097A JP H10309061 A JPH10309061 A JP H10309061A
Authority
JP
Japan
Prior art keywords
groove
oil
dynamic pressure
pressure generating
sleeve
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
Application number
JP12628097A
Other languages
Japanese (ja)
Inventor
Masahisa Tsuchiya
昌久 土屋
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.)
Tokyo Parts Ind Co Ltd
Original Assignee
Tokyo Parts Ind Co 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 Tokyo Parts Ind Co Ltd filed Critical Tokyo Parts Ind Co Ltd
Priority to JP12628097A priority Critical patent/JPH10309061A/en
Publication of JPH10309061A publication Critical patent/JPH10309061A/en
Pending legal-status Critical Current

Links

Landscapes

  • Sliding-Contact Bearings (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent the leakage of dynamic pressure generating oil with a simple structure, by forming an oil collecting groove continuously from at least one end of a dynamic pressure generating groove in the peripheral direction. SOLUTION: An oil collecting groove 10 is formed on one end side of a dynamic pressure generating groove 1a. The groove 10 is continuously formed from the groove 1a in the peripheral direction. In addition, the depth of the groove 10 is made equal to or deeper than the groove 1a. Therefore, the oil 8 in the groove 1a is collected in the groove 10 and the leakage of the oil 8 to the outside from the groove 10 can be prevented. In addition, since the grooves 1a and 10 are continuously formed and the oil 8 collected in the groove 10 is supplied to the groove 1a without allowing the oil 8 to leak out, the oil 8 can be circulated excellently.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、動圧軸受型モータ
に係り、より具体的には動圧発生溝に介在する動圧発生
オイルの漏れ防止に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydrodynamic bearing type motor, and more particularly, to prevention of leakage of hydrodynamic oil generated in a hydrodynamic groove.

【0002】[0002]

【従来の技術】従来から、CD−ROM等のスピンドル
モータの軸受構造として動圧型流体軸受構造を用いたも
のが種々提案されており、例えば、特開平8−2987
47号公報や特開平8−331796号公報などに記載
されたものがあった。
2. Description of the Related Art Conventionally, various types of bearing structures for spindle motors such as CD-ROMs using a hydrodynamic fluid bearing structure have been proposed.
No. 47 and Japanese Patent Application Laid-Open No. 8-331796.

【0003】上記のものは、磁性流体を潤滑流体として
用いることによって、磁気力と毛細管力とを併用するシ
ール部によって流体保持機能を得るように構成したもの
であったり、スリーブ端面に薄板を配置し、スリーブ端
面との間にオイル保持空間を形成することにより軸受の
オイル流出を防止するものであった。
[0003] The above-mentioned structure is configured such that a magnetic fluid is used as a lubricating fluid so that a fluid holding function is obtained by a seal portion using both magnetic force and capillary force, or a thin plate is disposed on the end face of a sleeve. However, by forming an oil holding space between the sleeve and the end face of the sleeve, the oil is prevented from flowing out of the bearing.

【0004】[0004]

【発明が解決しようとする課題】しかしながら、上記の
ような動圧流体軸受構造であると、動圧発生流体として
特殊なオイルを使用しなければならず、また、部品点数
の増加を招くことによって構造的に複雑になってしまう
という問題を有していた。そのため、コスト的にも高コ
スト化してしまい、低コスト化への実現が難しいもので
あった。
However, in the above-described hydrodynamic bearing structure, a special oil must be used as a hydrodynamic fluid, and the number of parts increases. There was a problem that the structure became complicated. Therefore, the cost is increased, and it is difficult to reduce the cost.

【0005】そこで、本発明は上記したような問題を解
決して、簡素な構造により動圧軸受における動圧発生オ
イルの漏出等を防止し、長期にわたって前記オイルを保
持可能とすることにより高寿命で尚且つ信頼性の優れた
動圧軸受型モータを提供しようというものである。
Accordingly, the present invention solves the above-mentioned problems, prevents leakage of the dynamic pressure generating oil in the dynamic pressure bearing with a simple structure, and enables the oil to be retained for a long period of time, thereby achieving a long service life. It is an object of the present invention to provide a dynamic bearing type motor which is excellent in reliability.

【0006】[0006]

【課題を解決するための手段】本発明は、動圧発生溝の
少なくとも一端に、動圧発生溝と連続するような周方向
に形成されたオイル溜まり溝を配するようにしたもの
で、簡素な構造により動圧発生オイルのオイル漏れを防
止することができるようになり、このオイル溜まり溝は
動圧発生溝と連続しているため、動圧発生オイルの良好
な循環が実現可能となる。
According to the present invention, at least one end of a dynamic pressure generating groove is provided with an oil reservoir groove formed in a circumferential direction so as to be continuous with the dynamic pressure generating groove. With such a structure, it is possible to prevent oil leakage of the dynamic pressure generating oil, and since this oil reservoir groove is continuous with the dynamic pressure generating groove, it is possible to realize good circulation of the dynamic pressure generating oil.

【0007】[0007]

【発明の実施の形態】本発明の動圧軸受型モータは、回
転軸あるいはスリーブのいずれか一方に動圧発生溝を形
成し、前記回転軸と前記スリーブとの間に動圧発生流体
を介在させてなる動圧軸受型モータにおいて、前記動圧
発生溝の少なくとも一端には前記動圧発生溝と連続する
ようにして周方向に形成されたオイル溜まり溝が配され
てなるものである。また、前記オイル溜まり溝は、前記
スリーブの端面よりも内方に配されてなるのが好まし
い。
BEST MODE FOR CARRYING OUT THE INVENTION In a dynamic bearing type motor according to the present invention, a dynamic pressure generating groove is formed in one of a rotary shaft and a sleeve, and a dynamic pressure generating fluid is interposed between the rotary shaft and the sleeve. In the hydrodynamic bearing type motor formed as described above, at least one end of the dynamic pressure generating groove is provided with an oil sump groove formed in the circumferential direction so as to be continuous with the dynamic pressure generating groove. Further, it is preferable that the oil sump groove is disposed inward of an end face of the sleeve.

【0008】[0008]

【第1の実施例】図1は、本発明の第1の実施例におけ
るスピンドルモータの要部断面図であり、図2は、図1
における動圧流体軸受部の拡大図である。同図におい
て、1は動圧発生溝1aの形成された回転軸であり、ス
テータベース2に加締め等により固定されたステータハ
ウジング兼スリーブ3によって、この回転軸1はステー
タハウジング兼スリーブ3の内周面に形成されたスリー
ブ部3aによって保持されている。また、ステータハウ
ジング3の外周面にはステータコア4が固定されるよう
になり、このステータコア4には複数個のコイル5が施
されている。
FIG. 1 is a sectional view of a main part of a spindle motor according to a first embodiment of the present invention, and FIG.
FIG. 4 is an enlarged view of a hydrodynamic bearing portion in FIG. In FIG. 1, reference numeral 1 denotes a rotating shaft having a dynamic pressure generating groove 1a formed therein. The rotating shaft 1 is fixed to a stator base 2 by caulking or the like. It is held by a sleeve portion 3a formed on the peripheral surface. A stator core 4 is fixed to the outer peripheral surface of the stator housing 3, and a plurality of coils 5 are provided on the stator core 4.

【0009】また、回転軸1には圧入等によりカップ状
のロータヨーク6が固定されており、このロータヨーク
6の内周面にはステータコア4に所定の空隙を介してリ
ング状の界磁マグネット7が配されている。そして、回
転軸1とスリーブ部3aとの間に動圧発生オイル8とし
てフッ素系オイルを介在させることにより、ステータコ
ア4と界磁マグネット7との磁気的作用によって回転駆
動させる。なお、9は回転軸1をスラスト方向に保持す
るスラスト受けである。
Further, a cup-shaped rotor yoke 6 is fixed to the rotating shaft 1 by press-fitting or the like, and a ring-shaped field magnet 7 is provided on the inner peripheral surface of the rotor yoke 6 through a predetermined gap in the stator core 4. Are arranged. Then, by interposing fluorine-based oil as the dynamic pressure generating oil 8 between the rotating shaft 1 and the sleeve portion 3a, the stator core 4 and the field magnet 7 are driven to rotate by the magnetic action. Reference numeral 9 denotes a thrust receiver that holds the rotating shaft 1 in the thrust direction.

【0010】ここで、符号10で示すように動圧発生溝
1aの一端側にはオイル溜まり溝が配されている。この
オイル溜まり溝10は周方向に形成され、動圧発生溝1
aと連続した形状になっている。また、オイル溜まり溝
10の深さは動圧発生溝1aと同等かもしくはそれより
も大に形成されるが、動圧発生オイル8の循環を考慮す
ればオイル溜まり溝10と動圧発生溝1aとの深さは同
等であるのが好ましい。また、オイル溜まり溝10はス
リーブ部3aの端面よりも内方に配置されており、オイ
ル溜まり溝10に溜まる動圧発生オイル8の保持機能を
更に向上させるものである。
Here, as shown by reference numeral 10, an oil reservoir groove is arranged at one end of the dynamic pressure generating groove 1a. This oil sump groove 10 is formed in the circumferential direction, and the dynamic pressure generation groove 1
The shape is continuous with a. The depth of the oil reservoir groove 10 is equal to or greater than that of the dynamic pressure generating groove 1a. However, considering the circulation of the dynamic pressure generating oil 8, the oil reservoir groove 10 and the dynamic pressure generating groove 1a are formed. Are preferably equal to each other. Further, the oil sump groove 10 is arranged inside the end face of the sleeve portion 3a, and further improves the function of holding the dynamic pressure generating oil 8 accumulated in the oil sump groove 10.

【0011】上記のようにすれば、動圧発生溝1a内の
オイル8はオイル溜まり溝10で受け止められることに
なり、この溝10より外方へのオイル漏出を防止するこ
とができる。しかも、オイル溜まり溝10と動圧発生溝
1aとが連続していることから、オイル溜まり溝10に
溜まったオイル8は外部に漏れることなく動圧発生溝内
に供給されるため、動圧発生オイルの良好な循環が実現
可能となる。なお、上記実施例ではステータハウジング
とスリーブとを一体としているが、各々別個に構成して
も差し支えない。また、オイル溜まり溝10は動圧発生
溝1aの両端にそれぞれ配してもよい。
According to the above, the oil 8 in the dynamic pressure generating groove 1a is received by the oil sump groove 10, so that the oil can be prevented from leaking out of the groove 10. In addition, since the oil sump groove 10 and the dynamic pressure generation groove 1a are continuous, the oil 8 accumulated in the oil sump groove 10 is supplied to the dynamic pressure generation groove without leaking to the outside. Good circulation of oil can be realized. In the above embodiment, the stator housing and the sleeve are integrated, but they may be formed separately. Further, the oil sump grooves 10 may be arranged at both ends of the dynamic pressure generating groove 1a.

【0012】[0012]

【第2の実施例】図3は、本発明の第2の実施例におけ
るスリーブの構成を示した図である。前述した実施例で
は、回転軸1に動圧発生溝1aを設けたものであるが、
本実施例のようにスリーブ13の内周面に動圧発生溝1
3aを形成しても構わない。図中(a)は動圧発生溝1
3aの一端に、動圧発生溝13aと連続するようにして
周方向にオイル溜まり溝20を形成したものである。そ
の他の構成については前述した実施例と同様である。
Second Embodiment FIG. 3 is a view showing the structure of a sleeve according to a second embodiment of the present invention. In the above-described embodiment, the rotating shaft 1 is provided with the dynamic pressure generating groove 1a.
The dynamic pressure generating groove 1 is formed on the inner peripheral surface of the sleeve 13 as in this embodiment.
3a may be formed. (A) in the figure is the dynamic pressure generating groove 1
An oil reservoir groove 20 is formed at one end of 3a in the circumferential direction so as to be continuous with the dynamic pressure generating groove 13a. Other configurations are the same as those of the above-described embodiment.

【0013】また、(b)では動圧発生溝13aの両端
にオイル溜まり溝20を設けたものであり、(c)では
動圧発生溝13aの中央にオイル溜まり溝20を設けた
ものである。さらに、(d)においてはハの字形に形成
された動圧発生溝20の両端にオイル溜まり溝を配し、
(e)では螺旋状に形成された動圧発生溝の両端にオイ
ル溜まり溝20を配している。なお、(e)のタイプで
あれば正逆両回転に対応できる。いずれの場合において
も、オイル溜まり溝20はスリーブ13の端面よりも内
方に配しておくのがよい。
In FIG. 2B, the oil reservoir grooves 20 are provided at both ends of the dynamic pressure generating groove 13a, and in FIG. 2C, the oil reservoir grooves 20 are provided at the center of the dynamic pressure generating groove 13a. . Further, in (d), oil sump grooves are arranged at both ends of the C-shaped dynamic pressure generation groove 20,
In (e), the oil sump grooves 20 are arranged at both ends of the spirally formed dynamic pressure generating groove. The type (e) can cope with both forward and reverse rotations. In any case, it is preferable that the oil sump groove 20 be disposed inside the end face of the sleeve 13.

【0014】なお、本発明は上記した各実施例に限ら
ず、本発明の主旨を逸脱しない範囲において種々変更し
て実施可能であるのは言うまでもない。
It is needless to say that the present invention is not limited to the above-described embodiments, but can be carried out with various modifications without departing from the gist of the present invention.

【0015】[0015]

【発明の効果】以上述べたように本発明によれば、動圧
発生溝の少なくとも一端には動圧発生溝と連続するよう
にして周方向に形成されたオイル溜まり溝が配されてな
るので、動圧発生溝内のオイルはオイル溜まり溝で受け
止められることになり、この溝より外方へのオイル漏出
を防止することができる。しかも、オイル溜まり溝と動
圧発生溝とが連続していることから、オイル溜まり溝に
溜まったオイルは外部に漏れることなく動圧発生溝内に
供給されるため、動圧発生オイルの枯渇を防いで良好な
循環が実現可能となる。
As described above, according to the present invention, at least one end of the dynamic pressure generating groove is provided with an oil sump groove formed in the circumferential direction so as to be continuous with the dynamic pressure generating groove. The oil in the dynamic pressure generating groove is received by the oil sump groove, so that the oil can be prevented from leaking out of the groove. In addition, since the oil sump groove and the dynamic pressure generating groove are continuous, the oil accumulated in the oil sump groove is supplied into the dynamic pressure generating groove without leaking to the outside. Prevention and good circulation can be realized.

【0016】また、上記構成を採用するにあたっては、
特殊なオイルを用いることなく動圧発生オイルの漏出防
止手段を非常に簡単な構成で実現できることから、コス
ト的にも著しい低減化が図れる。
In adopting the above configuration,
Since the means for preventing leakage of the dynamic pressure generating oil can be realized with a very simple configuration without using special oil, the cost can be significantly reduced.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の第1の実施例におけるスピンドルモー
タの要部断面図である。
FIG. 1 is a sectional view of a main part of a spindle motor according to a first embodiment of the present invention.

【図2】図1における動圧流体軸受部の拡大図である。FIG. 2 is an enlarged view of a hydrodynamic bearing portion in FIG.

【図3】本発明の第2の実施例におけるスリーブの構成
を示した図である。
FIG. 3 is a diagram showing a configuration of a sleeve according to a second embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1‥‥回転軸 1a,13a‥‥動圧発生溝 3‥‥ステータハウジング兼スリーブ 3a‥‥スリーブ部 8‥‥動圧発生オイル 10,20‥‥オイル溜まり溝 1 Rotary shaft 1a, 13a Dynamic pressure generating groove 3 Stator housing and sleeve 3a Sleeve section 8 Dynamic pressure generating oil 10, 20 Oil storage groove

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 回転軸あるいはスリーブのいずれか一方
に動圧発生溝を形成し、前記回転軸と前記スリーブとの
間に動圧発生オイルを介在させてなる動圧軸受型モータ
において、前記動圧発生溝の少なくとも一端には前記動
圧発生溝と連続するようにして周方向に形成されたオイ
ル溜まり溝が配されてなることを特徴とする動圧軸受型
モータ。
1. A dynamic pressure bearing type motor in which a dynamic pressure generating groove is formed in one of a rotary shaft and a sleeve, and a dynamic pressure generating oil is interposed between the rotary shaft and the sleeve. A hydrodynamic bearing type motor, characterized in that at least one end of the pressure generating groove is provided with an oil sump groove formed in the circumferential direction so as to be continuous with the dynamic pressure generating groove.
【請求項2】 前記オイル溜まり溝は、前記スリーブの
端面よりも内方に配されてなる請求項1記載の動圧軸受
型モータ。
2. The dynamic pressure bearing type motor according to claim 1, wherein said oil sump groove is disposed inward of an end face of said sleeve.
JP12628097A 1997-04-30 1997-04-30 Motor with hydrodynamic bearing Pending JPH10309061A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12628097A JPH10309061A (en) 1997-04-30 1997-04-30 Motor with hydrodynamic bearing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12628097A JPH10309061A (en) 1997-04-30 1997-04-30 Motor with hydrodynamic bearing

Publications (1)

Publication Number Publication Date
JPH10309061A true JPH10309061A (en) 1998-11-17

Family

ID=14931313

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12628097A Pending JPH10309061A (en) 1997-04-30 1997-04-30 Motor with hydrodynamic bearing

Country Status (1)

Country Link
JP (1) JPH10309061A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007061223A2 (en) * 2005-11-23 2007-05-31 Daewoo Electronics Corporation Oilless bearing type motor with function of preventing oil leakage
US20120033905A1 (en) * 2010-08-05 2012-02-09 Samsung Electro-Mechanics Co., Ltd. Fluid dynamic bearing assembly

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007061223A2 (en) * 2005-11-23 2007-05-31 Daewoo Electronics Corporation Oilless bearing type motor with function of preventing oil leakage
WO2007061223A3 (en) * 2005-11-23 2009-06-04 Daewoo Electronics Corp Oilless bearing type motor with function of preventing oil leakage
US20120033905A1 (en) * 2010-08-05 2012-02-09 Samsung Electro-Mechanics Co., Ltd. Fluid dynamic bearing assembly
US8475049B2 (en) * 2010-08-05 2013-07-02 Samsung Electro-Mechanics Co., Ltd. Fluid dynamic bearing assembly

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