JPH08322191A - Motor - Google Patents
MotorInfo
- Publication number
- JPH08322191A JPH08322191A JP7126130A JP12613095A JPH08322191A JP H08322191 A JPH08322191 A JP H08322191A JP 7126130 A JP7126130 A JP 7126130A JP 12613095 A JP12613095 A JP 12613095A JP H08322191 A JPH08322191 A JP H08322191A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- dynamic pressure
- sleeve
- pressure generating
- electric motor
- 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
- 230000002093 peripheral effect Effects 0.000 claims description 31
- 230000002265 prevention Effects 0.000 claims description 12
- 230000000717 retained effect Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 46
- 239000002184 metal Substances 0.000 abstract description 46
- 150000002739 metals Chemical class 0.000 abstract description 13
- 238000005086 pumping Methods 0.000 abstract description 8
- 230000007812 deficiency Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 87
- 239000000463 material Substances 0.000 description 6
- 239000010687 lubricating oil Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 150000005690 diesters Chemical class 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- -1 polyol ester Chemical class 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 102200082816 rs34868397 Human genes 0.000 description 1
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】本発明は、電動機に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor.
【０００２】[0002]
【従来の技術】従来の動圧型流体軸受を用いた電動機の
一例の構成を図８、図９、図１０に示す。図８は電動機
の正面図、図９は電動機の断面図、図１０はラジアル軸
受部の断面図である。図８、図９において、ステータ１
にはコイル２、隈取コイル３ａ，３ｂ、フレーム４，５
が取り付けられ、さらにフレーム５には樹脂等で作られ
たスラスター６が固定され、フレーム４にはスリーブ７
が固定され、ステータユニット８を構成している。ま
た、回転軸９にはロータ１０が固定され、スリーブ７を
はさんでオイルもれ防止リング１１，１２が配置され、
回転軸先端には負荷が接続されており、ロータユニット
１３を構成し、軸受を介して回転自在に取り付けられて
いる。2. Description of the Related Art FIG. 8, FIG. 9 and FIG. 10 show the structure of an example of a conventional electric motor using a hydrodynamic bearing. 8 is a front view of the electric motor, FIG. 9 is a sectional view of the electric motor, and FIG. 10 is a sectional view of the radial bearing portion. 8 and 9, the stator 1
The coil 2, the kumadori coils 3a, 3b, the frames 4, 5
, A thruster 6 made of resin or the like is fixed to the frame 5, and a sleeve 7 is attached to the frame 4.
Are fixed and constitute the stator unit 8. Further, the rotor 10 is fixed to the rotary shaft 9, and the oil leakage prevention rings 11 and 12 are arranged with the sleeve 7 interposed therebetween.
A load is connected to the tip of the rotating shaft, constitutes a rotor unit 13, and is rotatably attached via a bearing.
【０００３】次に、軸受について図１０を用いて説明す
ると、スリーブ内周面の負荷側及びロータ側の２箇所に
はボール転造等により、動圧発生溝１４，１５が形成さ
れている。この動圧発生溝１４，１５には潤滑油として
オイル１６が注油され、ラジアル軸受１７，１８を構成
している。また、図９において回転軸９の反負荷側端面
は球面に仕上げられておりスラスター６と接触しスラス
ト軸受１９を構成する。Next, the bearing will be described with reference to FIG. 10. Dynamic pressure generating grooves 14 and 15 are formed at two positions on the inner peripheral surface of the sleeve on the load side and the rotor side by ball rolling or the like. The dynamic pressure generating grooves 14 and 15 are filled with oil 16 as lubricating oil to form radial bearings 17 and 18. Further, in FIG. 9, the end face of the rotary shaft 9 on the side opposite to the load side is finished into a spherical surface and comes into contact with the thruster 6 to form a thrust bearing 19.
【０００４】[0004]
【発明が解決しようとする課題】しかしながらこのよう
な従来の電動機の構成では、オイル１６の蒸発や、回転
によるオイル１６の飛散や、２箇所の動圧発生溝１４，
１５のポンピング力の差等によるオイル１６の流れ出し
等が起こり、最終的には動圧発生溝１４，１５のオイル
不足が発生することで回転数の低下や電流値の増加、異
音が発生し、さらには、ロータユニット１３のロックが
発生し、信頼性を確保することが困難であった。However, in the structure of such a conventional electric motor, the oil 16 evaporates, the oil 16 scatters due to rotation, and the dynamic pressure generating grooves 14,
The oil 16 flows out due to the difference in the pumping force of 15, etc., and finally the oil shortage in the dynamic pressure generating grooves 14, 15 occurs, so that the rotation speed decreases, the current value increases, and abnormal noise occurs. Furthermore, the rotor unit 13 is locked, and it is difficult to ensure reliability.
【０００５】本発明は、上記課題を解決するもので、動
圧発生溝１４，１５のオイル不足を少なくし円滑な運転
が可能で高信頼性、長寿命の電動機を提供することを目
的とする。The present invention has been made to solve the above problems, and an object of the present invention is to provide a motor having high reliability and a long life, which is capable of smooth operation by reducing oil shortage in the dynamic pressure generating grooves 14, 15. .
【０００６】[0006]
【課題を解決するための手段】本発明の電動機は上記目
的を達成するために、請求項１記載に係る発明は軸とス
リーブを備え、前記軸の外周面又はスリーブの内周面に
動圧発生溝を形成し、前記動圧発生溝にオイルを保持す
る動圧型流体軸受を用いた電動機であって、前記動圧発
生溝の近傍に動圧発生溝に保持しているオイルと特性が
同一のオイルを含浸させた多孔質体を配置したものであ
る。In order to achieve the above object, an electric motor of the present invention comprises a shaft and a sleeve, and a dynamic pressure is applied to an outer peripheral surface of the shaft or an inner peripheral surface of the sleeve. An electric motor using a dynamic pressure type hydrodynamic bearing that forms a generation groove and holds oil in the dynamic pressure generation groove, and has the same characteristics as the oil held in the dynamic pressure generation groove near the dynamic pressure generation groove. The porous body impregnated with the oil is arranged.
【０００７】また、請求項２記載に係る発明は、多孔質
体は、軸と隙間を保ってスリーブに固定したリングとし
たものである。In the invention according to claim 2, the porous body is a ring fixed to the sleeve with a gap maintained between the porous body and the shaft.
【０００８】また、請求項３記載に係る発明は、スリー
ブに固定されているリングと軸との隙間は、動圧発生溝
の部分のスリーブと軸の隙間より大寸法もしくは同寸法
としたものである。Further, in the invention according to claim 3, the gap between the ring fixed to the sleeve and the shaft is larger than or equal to the gap between the sleeve and the shaft in the dynamic pressure generating groove portion. is there.
【０００９】また、請求項４記載に係る発明は、多孔質
体は、軸に固定されているリングとしたものである。In the invention according to claim 4, the porous body is a ring fixed to the shaft.
【００１０】また、請求項５記載に係る発明は、軸とス
リーブを備え、前記スリーブは複数で構成され、前記複
数のスリーブには各々動圧発生溝が形成されており、前
記動圧発生溝にオイルを保持する動圧型流体軸受を用い
た電動機であって、前記複数のスリーブの間に前記動圧
発生溝に保持しているオイルと特性が同一のオイルを含
浸させた多孔質体を配置し、また前記複数のスリーブを
同軸上に配置したものである。According to a fifth aspect of the present invention, a shaft and a sleeve are provided, the sleeve is composed of a plurality of sleeves, and a dynamic pressure generating groove is formed in each of the plurality of sleeves. An electric motor using a dynamic pressure type fluid bearing for holding oil, wherein a porous body impregnated with oil having the same characteristics as the oil held in the dynamic pressure generating groove is arranged between the plurality of sleeves. In addition, the plurality of sleeves are coaxially arranged.
【００１１】また、請求項６記載に係る発明は、多孔質
体を複数のスリーブの間と外周面を覆うように配置した
ものである。In the invention according to claim 6, the porous body is arranged so as to cover between the plurality of sleeves and the outer peripheral surface.
【００１２】また、請求項７記載に係る発明は、複数の
スリーブ端よりも、前記複数のスリーブの外周面を覆っ
ている多孔質体を軸方向に出したものである。In the invention according to claim 7, the porous body covering the outer peripheral surfaces of the plurality of sleeves is extended in the axial direction rather than the ends of the plurality of sleeves.
【００１３】また、請求項８記載に係る発明は、複数の
スリーブの間又は外側の多孔質体の少なくとも一方の内
周面の全部もしくは一部にも動圧発生溝を形成したもの
である。The invention according to claim 8 is one in which a dynamic pressure generating groove is formed on all or part of the inner peripheral surface of at least one of the porous bodies between the plurality of sleeves or on the outer side.
【００１４】また、請求項９記載に係る発明は、軸とス
リーブを備え、前記軸の外周面又はスリーブの内周面の
いずれか一方に動圧発生溝を形成し、前記動圧発生溝に
オイルを保持する動圧型流体軸受を用いた電動機であっ
て、前記スリーブ両端もしくは片端の内周面に径を大き
くした部分を設け、スリーブ両端もしくは片端の内周面
の径を大きくした部分に前記軸に固定されたリングを配
置したものである。The invention according to claim 9 comprises a shaft and a sleeve, wherein a dynamic pressure generating groove is formed on either the outer peripheral surface of the shaft or the inner peripheral surface of the sleeve, and the dynamic pressure generating groove is formed in the dynamic pressure generating groove. An electric motor using a hydrodynamic bearing for holding oil, wherein a portion having a large diameter is provided on the inner peripheral surface of both ends or one end of the sleeve, and the portion having a large diameter of the inner peripheral surface of both ends of the sleeve or one end is provided. It is a ring fixed to the shaft.
【００１５】[0015]
【作用】本発明の電動機は前記の構成により、十分な量
のオイルを保持した多孔質体からオイルがにじみ出し動
圧発生溝へオイルを供給するため、動圧発生溝のオイル
不足を抑えることが出来る。With the above structure, the electric motor of the present invention suppresses oil shortage in the dynamic pressure generation groove because the oil exudes from the porous body holding a sufficient amount of oil and supplies the oil to the dynamic pressure generation groove. Can be done.
【００１６】[0016]
（実施例１）以下、本発明の実施例１について図１、図
２、図８を参照しながら説明する。図１は本発明の実施
例１の電動機の断面図、図２は同電動機のラジアル軸受
部の断面図である。なお、図１、図２及び後述する図
３、図４、図５、図６において従来構成と同一あるいは
同一機能のものは同一符号を付す。図１、図８におい
て、ステータ１にはコイル２、及び隈取コイル３ａ，３
ｂ、フレーム４，５が取り付けられ、さらにフレーム５
には樹脂等で作られたスラスター６が固定され、フレー
ム４にはスリーブ７が固定され、ステータユニット８を
構成している。また、回転軸９には珪素鋼板およびアル
ミニウムで作られたロータ１０が固定され、回転軸先端
には負荷が接続されており、ロータ１０とスリーブ７の
間には弾性を有する樹脂等（例えば、ＰＥＳやＰＢＴ
等）で作られたオイルもれ防止リング２０、スリーブ７
の負荷側にはオイルもれ防止リング２１が配置され、ロ
ータユニット１３を構成し、軸受を介して回転自在に取
り付けられている。(Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1, 2 and 8. 1 is a sectional view of an electric motor according to a first embodiment of the present invention, and FIG. 2 is a sectional view of a radial bearing portion of the electric motor. In FIGS. 1 and 2 and later-described FIGS. 3, 4, 5, and 6, components having the same or the same functions as those of the conventional configuration are designated by the same reference numerals. 1 and 8, the stator 1 has a coil 2, and the decoupling coils 3a and 3a.
b, frames 4 and 5 are attached, and further frame 5
A thruster 6 made of resin or the like is fixed to the, and a sleeve 7 is fixed to the frame 4 to form a stator unit 8. A rotor 10 made of a silicon steel plate and aluminum is fixed to the rotary shaft 9, a load is connected to the tip of the rotary shaft, and an elastic resin or the like is provided between the rotor 10 and the sleeve 7 (for example, PES and PBT
Oil leakage prevention ring 20, sleeve 7 made of
An oil leakage prevention ring 21 is disposed on the load side of the rotor, constitutes a rotor unit 13, and is rotatably attached via a bearing.
【００１７】次に、軸受について図２を用いて説明する
と、スリーブ内周面の負荷側及びロータ側の２箇所には
ボール転造等により、動圧発生溝１４，１５が形成され
ている。この動圧発生溝１４，１５には潤滑油としてオ
イル１６が注油され、回転軸９と数μｍの隙間を保ちラ
ジアル軸受１７，１８を構成している。また、動圧発生
溝１４，１５の間にはオイルだまりを設け動圧発生溝１
４，１５に保持したオイル１６の余剰分を保持してい
る。また、回転軸９の反負荷側端面は球面に仕上げられ
ておりスラスター６と接触しスラスト軸受１９を構成す
る（図１）。尚、スリーブ材料としては銅合金等が通常
使われる。回転軸材料はＳ４５ＣやＳＵＳ３０３，ＳＵ
Ｓ４２０Ｊ２等が用途によって使い分けられるが、特に
使用温度範囲が広い場合、スリーブ材料と線膨張係数の
近い材料が好ましく、例えば、スリーブ材料を銅合金と
した時、回転軸材料はＳＵＳ３０３等を使用することが
好ましい。オイル１６はジエステル、ポリオールエステ
ル、ａ−オレフィン、ふっ素樹脂オイル、鉱油等を用
い、条件によっては若干の添加剤を加えたものを用い
る。Next, the bearing will be described with reference to FIG. 2. Dynamic pressure generating grooves 14 and 15 are formed on the inner peripheral surface of the sleeve at two positions on the load side and the rotor side by ball rolling or the like. The dynamic pressure generating grooves 14 and 15 are filled with oil 16 as lubricating oil to form radial bearings 17 and 18 while maintaining a gap of several μm with the rotary shaft 9. Further, an oil pool is provided between the dynamic pressure generating grooves 14 and 15, and the dynamic pressure generating groove 1 is provided.
The surplus of the oil 16 held in Nos. 4 and 15 is held. The end face of the rotating shaft 9 on the side opposite to the load side is finished into a spherical surface and comes into contact with the thruster 6 to form a thrust bearing 19 (FIG. 1). A copper alloy or the like is usually used as the sleeve material. The material of the rotating shaft is S45C, SUS303, SU
S420J2 and the like can be used properly according to the application, but especially when the operating temperature range is wide, a material having a linear expansion coefficient close to that of the sleeve material is preferable. For example, when the sleeve material is a copper alloy, use SUS303 or the like as the rotating shaft material. Is preferred. As the oil 16, diester, polyol ester, a-olefin, fluororesin oil, mineral oil, or the like is used, and some additives are added depending on the conditions.
【００１８】また、スリーブ両端に多孔質体のリングと
しての焼結メタル２２，２３が固定され、この焼結メタ
ル２２，２３には動圧発生溝１４，１５に注油したオイ
ルと同一のオイル１６が含浸され、軸受ユニット２４を
構成している。Further, sintered metals 22 and 23 as rings of a porous body are fixed to both ends of the sleeve, and the same oil 16 as the oil injected into the dynamic pressure generating grooves 14 and 15 is fixed to the sintered metals 22 and 23. Are impregnated to form the bearing unit 24.
【００１９】上記構成において動作を説明すると、オイ
ル１６は蒸発や、回転による飛散や、２箇所の動圧発生
溝１４，１５のポンピング力の差等による流れ出し等が
起こり、オイル１６が流出しようとするが、スリーブ両
端に設置されたオイル１６を含浸した焼結メタル２２，
２３が、回転軸９の回転偏芯により内周面へオイル１６
がにじみ出し、又動圧発生溝１４，１５のポンピング
力、回転軸９と動圧発生溝１４，１５との小さな隙間Ｒ
による毛細管現象でオイル１６が動圧発生溝１４，１５
に引き込まれ、焼結メタル２２，２３から動圧発生溝１
４，１５へオイル１６が供給され、動圧発生溝１４，１
５のオイル不足を抑え、さらに、動圧発生溝１４，１５
から流出したオイル１６を焼結メタル２２，２３が保持
する働きによって、オイルの流出を減少させることで、
電動機の高信頼性、長寿命化に効果がある。The operation of the above structure will be described. The oil 16 evaporates, scatters due to rotation, and flows out due to a difference in pumping force between the dynamic pressure generating grooves 14 and 15 at two places, so that the oil 16 tends to flow out. However, the sintered metal 22 impregnated with the oil 16 installed on both ends of the sleeve,
23 causes oil 16 to move to the inner peripheral surface due to the eccentric rotation of the rotary shaft 9.
Bleeding out, pumping force of the dynamic pressure generating grooves 14 and 15, and a small gap R between the rotary shaft 9 and the dynamic pressure generating grooves 14 and 15.
Oil 16 causes dynamic pressure generation grooves 14 and 15 due to capillary phenomenon caused by
To the dynamic pressure generating groove 1 from the sintered metal 22 and 23.
The oil 16 is supplied to the hydraulic pressure generating grooves 14 and 1
The oil shortage of 5 is suppressed, and the dynamic pressure generating grooves 14, 15
Since the sintered metal 22, 23 holds the oil 16 that has flowed out of the
Effective for high reliability and long life of electric motors.
【００２０】また、焼結メタル２２，２３と回転軸９の
隙間ｒ１は、動圧発生溝１４，１５と回転軸９の隙間Ｒ
と同じかまたは大きくしている。これは、動圧発生溝部
１４，１５に発生した圧力で回転軸９が軸受ユニット２
４と非接触で回転するが、焼結メタル２２，２３と回転
軸９の隙間ｒ１を動圧発生溝１４，１５と回転軸９の隙
間Ｒより小さくすれば、焼結メタル２２，２３と回転軸
９が軸受ユニット２４と接触回転し、非接触回転するが
故の低振動、低騒音、低軸受摩擦トルク、耐摩耗性等の
特性の低下につながる。よって、焼結メタル２２，２３
と回転軸９の隙間ｒ１は、動圧発生溝１４，１５と回転
軸９の隙間Ｒと同じか又は大きくしていることで、回転
軸９が軸受ユニット２４と非接触回転をし、低振動、低
騒音、低軸受摩擦トルク、耐摩耗性等の特性を保ち効果
がある。The clearance r1 between the sintered metals 22 and 23 and the rotary shaft 9 is the clearance R between the dynamic pressure generating grooves 14 and 15 and the rotary shaft 9.
Same as or larger than. This is because the rotary shaft 9 is rotated by the pressure generated in the dynamic pressure generating groove portions 14 and 15 and the bearing unit 2
4 does not rotate, but if the gap r1 between the sintered metals 22 and 23 and the rotary shaft 9 is made smaller than the gap R between the dynamic pressure generating grooves 14 and 15 and the rotary shaft 9, the sintered metal 22 and 23 will rotate. Since the shaft 9 rotates in contact with the bearing unit 24 and rotates in non-contact, characteristics such as low vibration, low noise, low bearing friction torque, and wear resistance are deteriorated. Therefore, the sintered metal 22, 23
The gap r1 between the rotary shaft 9 and the rotary shaft 9 is equal to or larger than the gap R between the dynamic pressure generating grooves 14 and 15 and the rotary shaft 9, so that the rotary shaft 9 rotates in a non-contact manner with the bearing unit 24, resulting in low vibration. It is effective in maintaining characteristics such as low noise, low bearing friction torque, and wear resistance.
【００２１】さらに、スリーブ７の焼結メタル２２，２
３が固定された外側は、回転軸９に固定されたオイルも
れ防止リング２０，２１がスリーブ７に覆われるよう
に、オイルもれ防止リング２０，２１の外径よりも若干
スリーブ７の内径を大きくしているので、オイル１６が
回転軸９を伝わって流出するのをオイルもれ防止リング
２０，２１が防止し、回転によってオイル１６がスリー
ブ内に飛ばされ、スリーブ７に固定された焼結メタル２
２，２３によってオイル１６が保持される。特に冷蔵庫
庫内空気循環用モータ等、食品の近くで使用するような
場合、回転軸９を伝わってオイル１６が周囲に飛散する
ことは禁物であるため、オイルもれ防止リング２０，２
１によって、周囲へのオイル１６の飛散を抑え、また、
周囲から埃等のスリーブ内への混入防止も行うという効
果がある。Further, the sintered metal 22, 2 of the sleeve 7
The outer side where 3 is fixed is slightly larger than the outer diameter of the oil leakage prevention rings 20 and 21 so that the oil leakage prevention rings 20 and 21 fixed to the rotating shaft 9 are covered by the sleeve 7. Since the oil leakage prevention rings 20 and 21 prevent the oil 16 from flowing out along the rotating shaft 9, the oil 16 is blown into the sleeve by the rotation and is fixed to the sleeve 7. Metal 2
The oil 16 is held by 2, 23. Especially when used near food such as a motor for circulating air in a refrigerator, it is forbidden that the oil 16 is scattered around the rotating shaft 9 and therefore the oil leakage prevention rings 20, 2 are prevented.
1 prevents the oil 16 from scattering to the surroundings, and
This is effective in preventing dust from entering the sleeve from the surroundings.
【００２２】（実施例２）本発明の実施例２について図
３を参照しながら説明する。図３は本発明の実施例２の
電動機のラジアル軸受部の断面図である。実施例１で
は、多孔質体のリングとしての焼結メタル２２，２３を
スリーブ７側に設置したが、図３のように回転軸９に多
孔質体のリングとしての焼結メタル２５，２６を設ける
と、回転による遠心力でオイル１６が焼結メタル２５，
２６の外周表面ににじみ出し、動圧発生溝１４，１５の
ポンピング力と回転軸９と動圧発生溝１４，１５との小
さな隙間による毛細管現象でオイル１６が動圧発生溝１
４，１５に引き込まれ、動圧発生溝１４，１５へオイル
１６が供給され、動圧発生溝１４，１５のオイル不足を
抑える。(Second Embodiment) A second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a sectional view of a radial bearing portion of an electric motor according to a second embodiment of the present invention. In the first embodiment, the sintered metals 22 and 23 as the rings of the porous body are installed on the sleeve 7 side, but the sintered metals 25 and 26 as the rings of the porous body are attached to the rotating shaft 9 as shown in FIG. When installed, the oil 16 will cause the sintered metal 25,
The oil 16 oozes to the outer peripheral surface of 26, and the oil 16 is generated by the capillarity due to the pumping force of the dynamic pressure generating grooves 14 and 15 and the small gap between the rotary shaft 9 and the dynamic pressure generating grooves 14 and 15.
The oil 16 is drawn into the dynamic pressure generating grooves 14 and 15, and the oil 16 is supplied to the dynamic pressure generating grooves 14 and 15 to suppress the oil shortage in the dynamic pressure generating grooves 14 and 15.
【００２３】（実施例３）本発明の実施例３について図
４を参照しながら説明する。図４は本発明の実施例３の
電動機のラジアル軸受部の断面図である。図４におい
て、２個のスリーブ７ａ，７ｂが円筒部材２７に固定さ
れ、この２個のスリーブ７ａ，７ｂは同軸上に配置さ
れ、それぞれ動圧発生溝１４，１５が形成され、潤滑油
としてオイル１６が注油されて、回転軸９と数μｍの隙
間を保ちラジアル軸受１７，１８を構成している。ま
た、２つのスリーブ７ａ，７ｂの間には多孔質体の焼結
メタル２８が配置されており、この焼結メタル２８には
動圧発生溝１４，１５に注油したオイル１６と同一のオ
イルが含浸され、軸受ユニット２９を構成している。
尚、焼結メタル２８と回転軸９の隙間ｒ２は、動圧発生
溝１４，１５と回転軸９の隙間Ｒと同じか大きくしてい
る。(Embodiment 3) A third embodiment of the present invention will be described with reference to FIG. FIG. 4 is a sectional view of a radial bearing portion of an electric motor according to a third embodiment of the present invention. In FIG. 4, two sleeves 7a and 7b are fixed to a cylindrical member 27, the two sleeves 7a and 7b are coaxially arranged, and dynamic pressure generating grooves 14 and 15 are formed, respectively, and oil is used as a lubricating oil. 16 is lubricated to form radial bearings 17 and 18 while maintaining a gap of several μm with the rotating shaft 9. In addition, a porous sintered metal 28 is arranged between the two sleeves 7a and 7b, and the same oil as the oil 16 injected into the dynamic pressure generating grooves 14 and 15 is placed in this sintered metal 28. It is impregnated to form the bearing unit 29.
The gap r2 between the sintered metal 28 and the rotary shaft 9 is the same as or larger than the gap R between the dynamic pressure generating grooves 14 and 15 and the rotary shaft 9.
【００２４】上記構成における動作は実施例１と同様
に、スリーブ７ａ，７ｂの間に設置されたオイル１６を
含浸した焼結メタル２８が、回転軸９の回転偏芯により
内周面へオイル１６がにじみ出し、又動圧発生溝１４，
１５のポンピング力、回転軸９と動圧発生溝１４，１５
との小さな隙間Ｒによる毛細管現象でオイル１６が動圧
発生溝１４，１５に引き込まれ、焼結メタル２８から動
圧発生溝１４，１５へオイル１６が供給され、動圧発生
溝１４，１５のオイル不足を抑え、電動機の高信頼性、
長寿命化に効果がある。As with the first embodiment, the operation in the above-described structure is such that the sintered metal 28 impregnated with the oil 16 placed between the sleeves 7a and 7b moves to the inner peripheral surface of the oil 16 due to the eccentric rotation of the rotary shaft 9. Bleeding out, dynamic pressure generating groove 14,
15 pumping force, rotating shaft 9 and dynamic pressure generating grooves 14, 15
The oil 16 is drawn into the dynamic pressure generating grooves 14 and 15 by the capillary phenomenon due to the small gap R between the oil and the metal 16, and the oil 16 is supplied from the sintered metal 28 to the dynamic pressure generating grooves 14 and 15, Suppressing oil shortage, high reliability of electric motor,
Effective in extending the service life.
【００２５】（実施例４）本発明の実施例４について図
５を参照しながら説明する。図５は本発明の実施例４の
電動機のラジアル軸受部の断面図である。実施例３で
は、軸受ユニット２９の２個のスリーブ７ａ，７ｂの間
に多孔質体として焼結メタル２８を配置したが、図５の
ように、２個のスリーブ７ａ，７ｂの外周面にも多孔質
体として焼結メタル３０で覆ったものである。また、２
個のスリーブ７ａ，７ｂの外側端面よりスリーブ外周面
を覆った焼結メタル３０が軸方向に突出した軸受ユニッ
ト３１の構成になっている。さらに、回転軸９には軸受
ユニット両端近傍にオイルもれ防止リング２０，２１が
配置されている。(Fourth Embodiment) A fourth embodiment of the present invention will be described with reference to FIG. FIG. 5 is a sectional view of a radial bearing portion of an electric motor according to a fourth embodiment of the present invention. In the third embodiment, the sintered metal 28 is arranged as a porous body between the two sleeves 7a, 7b of the bearing unit 29, but as shown in FIG. 5, the sintered metal 28 is also provided on the outer peripheral surfaces of the two sleeves 7a, 7b. The porous body is covered with the sintered metal 30. Also, 2
The sintered metal 30 covering the outer peripheral surfaces of the sleeves 7a and 7b covers the outer peripheral surfaces of the sleeves 7a and 7b to form a bearing unit 31 that projects in the axial direction. Further, oil leakage prevention rings 20 and 21 are arranged on the rotary shaft 9 near both ends of the bearing unit.
【００２６】上記構成において動作を説明すると、オイ
ル１６は蒸発や、回転による飛散や、２箇所の動圧発生
溝１４，１５のポンピング力の差等による流れ出し等が
起こり、オイル１６が流出しようとするが、２個のスリ
ーブ間に設置されたオイル１６を含浸した焼結メタル３
０が、回転軸９の回転偏芯により内周面へオイル１６が
にじみ出し、又動圧発生溝１４，１５のポンピング力と
回転軸９と動圧発生溝１４，１５との小さな隙間ｒ２に
よる毛細管現象でオイルが動圧発生溝１４，１５に引き
込まれ、焼結メタル３０から動圧発生溝１４，１５へオ
イル１６を供給し、さらに、動圧発生溝１４，１５から
回転軸９を伝わって流出しようとするオイル１６をオイ
ルもれ防止リング２０，２１の回転により焼結メタル内
に再度保持させ、焼結メタル内と動圧発生溝の間をオイ
ル１６が循環する。このオイルの循環により、軸受ユニ
ット３１からオイル１６が減ることなく常に動圧発生溝
１４，１５へオイルを供給し、また熱交換が促進され摩
擦熱によるオイルの劣化を抑えることが出来、実施例３
より更に電動機の高信頼性、長寿命化に効果がある。The operation of the above structure will be described. The oil 16 evaporates, scatters due to rotation, and flows out due to a difference in pumping force between the dynamic pressure generating grooves 14 and 15 at two places, so that the oil 16 tends to flow out. However, the sintered metal 3 impregnated with the oil 16 installed between the two sleeves 3
0 due to the rotational eccentricity of the rotating shaft 9 causes the oil 16 to bleed to the inner peripheral surface, and also due to the pumping force of the dynamic pressure generating grooves 14 and 15 and the small gap r2 between the rotating shaft 9 and the dynamic pressure generating grooves 14 and 15. The oil is drawn into the dynamic pressure generating grooves 14 and 15 by the capillary phenomenon, the oil 16 is supplied from the sintered metal 30 to the dynamic pressure generating grooves 14 and 15, and further transmitted from the dynamic pressure generating grooves 14 and 15 through the rotary shaft 9. The oil 16 that is about to flow out is retained again in the sintered metal by the rotation of the oil leakage prevention rings 20 and 21, and the oil 16 circulates between the sintered metal and the dynamic pressure generating groove. By this oil circulation, the oil is constantly supplied from the bearing unit 31 to the dynamic pressure generating grooves 14 and 15 without being reduced, and heat exchange is promoted to prevent deterioration of the oil due to frictional heat. Three
It is even more effective in improving the reliability and life of the electric motor.
【００２７】（実施例５）本発明の実施例５について図
６を参照しながら説明する。図６は本発明の実施例５の
電動機のラジアル軸受部の断面図である。実施例４では
２個のスリーブ７ａ，７ｂの間の多孔質体として焼結メ
タル３０からオイル１６を動圧発生溝１４，１５へ供給
したが、図６のようにスリーブ７ａ，７ｂの外側端付近
にも多孔質体として焼結メタル３２，３３を配置し、軸
受ユニット３４を構成し、回転軸９との隙間ｒ３を動圧
発生溝１４，１５との隙間Ｒと同じか又は大きくしたも
のである。このスリーブ７ａ，７ｂの外側端付近の焼結
メタル３２，３３は、２個のスリーブ７ａ，７ｂ間の焼
結メタル３０と別部材とし圧入等で固定することもある
が、一体成形することもある。(Fifth Embodiment) A fifth embodiment of the present invention will be described with reference to FIG. 6 is a sectional view of a radial bearing portion of an electric motor according to a fifth embodiment of the present invention. In the fourth embodiment, the oil 16 was supplied from the sintered metal 30 to the dynamic pressure generating grooves 14 and 15 as a porous body between the two sleeves 7a and 7b, but as shown in FIG. Sintered metals 32 and 33 are also arranged in the vicinity as porous bodies to form a bearing unit 34, and a gap r3 with the rotating shaft 9 is equal to or larger than a gap R with the dynamic pressure generating grooves 14 and 15. Is. The sintered metal 32, 33 near the outer ends of the sleeves 7a, 7b may be fixed by press-fitting or the like as a separate member from the sintered metal 30 between the two sleeves 7a, 7b, or may be integrally molded. is there.
【００２８】上記構成により、スリーブ７ａ，７ｂの両
端よりオイル１６を供給することが可能となり、実施例
４より更に電動機の高信頼性、長寿命化に効果がある。With the above structure, the oil 16 can be supplied from both ends of the sleeves 7a and 7b, which is more effective than the fourth embodiment in improving the reliability and life of the electric motor.
【００２９】（実施例６）本発明の実施例６について図
７を参照しながら説明する。図７は本発明の実施例６の
電動機のラジアル軸受部の断面図である。実施例５では
単に焼結メタル３２，３３を配置しているだけである
が、図７のように多孔質体としての焼結メタル３５，３
６，３７，３８の一部にも動圧発生溝１４ａ，１４ｂ，
１５ａ，１５ｂを形成し軸受ユニット３９を構成したこ
とにより、焼結メタル３５，３６，３７，３８と回転軸
９の隙間ににじみ出したオイル１６が動圧発生溝１４
ａ，１４ｂ，１５ａ，１５ｂに沿って動圧発生溝１４，
１５の中心に集まろうと働くため、動圧発生溝１４，１
５への焼結メタル３５，３６，３７，３８からのオイル
１６の供給がより積極的に行われ、さらに、焼結メタル
３５，３６，３７，３８の一部にも動圧が発生するた
め、焼結メタル３５，３６，３７，３８からのオイル１
６のにじみ出し及び焼結メタル３５，３６，３７，３８
へのオイル１６の流入がより積極的に行われる。このよ
うに、常時オイル１６が焼結メタル内と動圧発生溝の間
を循環することにより、実施例５より更に電動機の高信
頼性、長寿命化に効果がある。(Sixth Embodiment) A sixth embodiment of the present invention will be described with reference to FIG. 7 is a sectional view of a radial bearing portion of an electric motor according to a sixth embodiment of the present invention. In the fifth embodiment, the sintered metals 32 and 33 are simply arranged, but as shown in FIG. 7, the sintered metals 35 and 3 as the porous body are arranged.
6, 37 and 38 also have dynamic pressure generating grooves 14a, 14b,
By forming the bearing units 39 by forming 15a and 15b, the oil 16 oozing into the gaps between the sintered metals 35, 36, 37 and 38 and the rotary shaft 9 is formed into the dynamic pressure generating groove 14.
a, 14b, 15a, 15b along the dynamic pressure generating groove 14,
Since they work to gather in the center of 15, the dynamic pressure generating grooves 14, 1
Since the oil 16 is more positively supplied from the sintered metal 35, 36, 37, 38 to the 5, the dynamic pressure is generated in a part of the sintered metal 35, 36, 37, 38. , Oil from sintered metal 35, 36, 37, 38
Exudation of 6 and sintered metal 35, 36, 37, 38
Inflow of the oil 16 into the oil is performed more positively. Thus, the oil 16 is constantly circulated in the sintered metal and between the dynamic pressure generating grooves, which is more effective than the fifth embodiment in improving the reliability and extending the life of the electric motor.
【００３０】なお、電動機構造、電動機形式、軸受構
造、オイル、多孔質体等は各実施例に限定されるもので
はなく、様々な設計変更が可能であることは言うまでも
ない。また、上記実施例において、動圧発生溝はスリー
ブ内周面に形成したが、回転軸に形成してもよく、さら
に、軸が回転するようにしているが、軸受ユニットが回
転し、軸が固定される構成でもよい。It is needless to say that the electric motor structure, electric motor type, bearing structure, oil, porous body, etc. are not limited to the respective embodiments, and various design changes are possible. Further, in the above-mentioned embodiment, the dynamic pressure generating groove is formed on the inner peripheral surface of the sleeve, but it may be formed on the rotating shaft, and further, the shaft is made to rotate. It may be fixed.
【００３１】[0031]
【発明の効果】以上の説明から明らかなように、本発明
によれば動圧発生溝の近傍に配置した焼結メタルから動
圧発生溝へオイルが供給され、動圧発生溝のオイル不足
を抑え、さらに焼結メタルと動圧発生溝の間をオイルが
循環することで常時動圧発生溝へオイルを供給し、高信
頼性、長寿命の電動機が得られるという大きな効果を有
するものである。As is apparent from the above description, according to the present invention, oil is supplied to the dynamic pressure generating groove from the sintered metal arranged in the vicinity of the dynamic pressure generating groove, and the oil shortage in the dynamic pressure generating groove is prevented. Further, the oil circulates between the sintered metal and the dynamic pressure generating groove to constantly supply the oil to the dynamic pressure generating groove, which has a great effect that a highly reliable and long-life motor can be obtained. .
【図１】本発明の実施例１の電動機の断面図FIG. 1 is a sectional view of an electric motor according to a first embodiment of the present invention.
【図２】本発明の実施例１のラジアル軸受部の断面図FIG. 2 is a sectional view of the radial bearing portion according to the first embodiment of the present invention.
【図３】本発明の実施例２のラジアル軸受部の断面図FIG. 3 is a sectional view of a radial bearing portion according to a second embodiment of the present invention.
【図４】本発明の実施例３のラジアル軸受部の断面図FIG. 4 is a sectional view of a radial bearing portion according to a third embodiment of the present invention.
【図５】本発明の実施例４のラジアル軸受部の断面図FIG. 5 is a sectional view of a radial bearing portion according to a fourth embodiment of the present invention.
【図６】本発明の実施例５のラジアル軸受部の断面図FIG. 6 is a sectional view of a radial bearing portion according to a fifth embodiment of the present invention.
【図７】本発明の実施例６のラジアル軸受部の断面図FIG. 7 is a sectional view of a radial bearing portion according to a sixth embodiment of the present invention.
【図８】従来例の電動機の正面図FIG. 8 is a front view of a conventional electric motor.
【図９】従来例の電動機の断面図FIG. 9 is a cross-sectional view of a conventional motor
【図１０】従来例のラジアル軸受部の断面図FIG. 10 is a sectional view of a radial bearing portion of a conventional example.
１ ステータ ２ コイル ３ａ，３ｂ 隈取コイル ４，５ フレーム ６ スラスター ７，７ａ，７ｂ スリーブ ８ ステータユニット ９ 回転軸 １０ ロータ １１，１２，２０，２１ オイルもれ防止リング １４，１４ａ，１４ｂ，１５，１５ａ，１５ｂ 動圧発
生溝 １６ オイル １９ スラスト軸受 ２２，２３，２５，２６，２８，３０，３２，３３，３
５，３６，３７，３８焼結メタル（多孔質体） ２４，２９，３１，３４，３９ 軸受ユニットDESCRIPTION OF SYMBOLS 1 stator 2 coil 3a, 3b shading coil 4,5 frame 6 thruster 7, 7a, 7b sleeve 8 stator unit 9 rotating shaft 10 rotor 11, 12, 20, 21 oil leak prevention ring 14, 14a, 14b, 15, 15a , 15b Dynamic pressure generating groove 16 Oil 19 Thrust bearing 22, 23, 25, 26, 28, 30, 32, 33, 3
5,36,37,38 Sintered metal (porous material) 24,29,31,34,39 Bearing unit
Claims (10)
は前記スリーブの内周面に動圧発生溝を形成し、前記動
圧発生溝にオイルを保持する動圧型流体軸受を用いた電
動機であって、前記動圧発生溝の近傍に前記オイルと特
性が同一のオイルを含浸させた多孔質体を配置している
ことを特徴とする電動機。1. An electric motor comprising a shaft and a sleeve, wherein a dynamic pressure generating groove is formed on an outer peripheral surface of the shaft or an inner peripheral surface of the sleeve, and the dynamic pressure generating groove holds oil in the dynamic pressure generating groove. An electric motor characterized in that a porous body impregnated with oil having the same characteristics as the oil is arranged near the dynamic pressure generation groove.
に固定したリングとしたことを特徴とする請求項１記載
の電動機。2. The electric motor according to claim 1, wherein the porous body is a ring fixed to the sleeve with a gap maintained between the porous body and the shaft.
の隙間は、動圧発生溝部の前記スリーブと前記軸の隙間
より大寸法もしくは同寸法としたことを特徴とする請求
項２記載の電動機。3. The electric motor according to claim 2, wherein the gap between the ring fixed to the sleeve and the shaft is larger than or equal to the gap between the sleeve and the shaft in the dynamic pressure generating groove portion. .
ことを特徴とする請求項１記載の電動機。4. The electric motor according to claim 1, wherein the porous body is a ring fixed to a shaft.
数で構成され、前記複数のスリーブには各々動圧発生溝
が形成されており、前記動圧発生溝にオイルを保持する
動圧型流体軸受を用いた電動機であって、前記複数のス
リーブの間に前記オイルと特性が同一のオイルを含浸さ
せた多孔質体を配置し、また前記複数のスリーブを同軸
上に配置したことを特徴とする電動機。5. A dynamic pressure type hydrodynamic bearing comprising a shaft and a sleeve, wherein the sleeve is composed of a plurality of sleeves, and a dynamic pressure generating groove is formed in each of the plurality of sleeves, and the dynamic pressure generating groove holds oil. And a porous body impregnated with the oil having the same characteristics as the oil is arranged between the plurality of sleeves, and the plurality of sleeves are arranged coaxially. Electric motor.
を覆うように配置したことを特徴とする請求項５記載の
電動機。6. The electric motor according to claim 5, wherein the porous body is arranged between the plurality of sleeves and so as to cover the outer peripheral surface.
リーブの外周面を覆っている多孔質体を軸方向に出した
ことを特徴とする請求項６記載の電動機。7. The electric motor according to claim 6, wherein the porous body covering the outer peripheral surfaces of the plurality of sleeves is extended in the axial direction rather than the ends of the plurality of sleeves.
の少なくとも一方の内周面の全部もしくは一部にも動圧
発生溝を形成したことを特徴とする請求項３，５，６、
または請求項７のいずれかに記載の電動機。8. A dynamic pressure generating groove is also formed on all or part of the inner peripheral surface of at least one of the porous bodies between the plurality of sleeves or on the outer side of the plurality of sleeves.
Alternatively, the electric motor according to claim 7.
は前記スリーブの内周面のいずれか一方に動圧発生溝を
形成し、前記動圧発生溝にオイルを保持する動圧型流体
軸受を用いた電動機であって、前記スリーブ両端もしく
は片端の内周面に径を大きくした部分を設け、前記スリ
ーブ両端もしくは片端の内周面の径を大きくした部分に
前記軸に固定されたオイルもれ防止リングを配置したこ
とを特徴とする電動機。9. A dynamic pressure type fluid bearing comprising a shaft and a sleeve, wherein a dynamic pressure generating groove is formed on either the outer peripheral surface of the shaft or the inner peripheral surface of the sleeve, and oil is retained in the dynamic pressure generating groove. In the electric motor using, the oil having a large diameter is provided on the inner peripheral surface of both ends or one end of the sleeve, and the oil fixed to the shaft is also provided on the part of the inner peripheral surface having both ends of the sleeve or one end having a large diameter. An electric motor that is equipped with an anti-skid ring.
又は前記スリーブの内周面に動圧発生溝を形成し、前記
動圧発生溝にオイルを保持し、前記動圧発生溝の近傍に
前記オイルと特性が同一のオイルを含浸させた多孔質体
を配置している動圧型流体軸受を用いた電動機であっ
て、前記スリーブもしくは前記多孔質体の両端もしくは
片端の内周面に径を大きくした部分を設け、前記スリー
ブもしくは前記多孔質体の両端もしくは片端の内周面の
径を大きくした部分に前記軸に固定されたオイルもれ防
止リングを配置した請求項１または請求項７記載の電動
機。10. A shaft and a sleeve are provided, and a dynamic pressure generation groove is formed on an outer peripheral surface of the shaft or an inner peripheral surface of the sleeve, and oil is retained in the dynamic pressure generation groove, and the vicinity of the dynamic pressure generation groove is provided. A motor using a hydrodynamic bearing in which a porous body impregnated with oil having the same characteristics as that of the oil is disposed in the sleeve or the inner surface of one end of the porous body or one end of the porous body. The oil leakage prevention ring fixed to the shaft is arranged at a portion where the diameter of the inner peripheral surface at both ends or one end of the sleeve or the porous body is increased, and the oil leakage prevention ring is disposed at the portion where the diameter is increased. The electric motor described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12613095A JP3637632B2 (en) | 1995-05-25 | 1995-05-25 | Electric motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12613095A JP3637632B2 (en) | 1995-05-25 | 1995-05-25 | Electric motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08322191A true JPH08322191A (en) | 1996-12-03 |
| JP3637632B2 JP3637632B2 (en) | 2005-04-13 |
Family
ID=14927415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12613095A Expired - Fee Related JP3637632B2 (en) | 1995-05-25 | 1995-05-25 | Electric motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3637632B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000004298A1 (en) * | 1998-07-17 | 2000-01-27 | Koninklijke Philips Electronics N.V. | Dynamic groove bearing comprising a porous lubricant reservoir |
| JP2005083506A (en) * | 2003-09-09 | 2005-03-31 | Canon Inc | Air bearing device |
| KR100516745B1 (en) * | 1996-12-25 | 2006-01-12 | 엔티엔 가부시키가이샤 | Dynamic Pressure Porous Oil Bearings & Bearings |
| JP2007057048A (en) * | 2005-08-25 | 2007-03-08 | Nidec Copal Electronics Corp | Fluid dynamic pressure bearing and motor comprising the same |
| WO2007102359A1 (en) * | 2006-03-09 | 2007-09-13 | Ntn Corporation | Fluid bearing device |
| JP2007239920A (en) * | 2006-03-09 | 2007-09-20 | Ntn Corp | Fluid bearing device |
| WO2007142062A1 (en) * | 2006-06-07 | 2007-12-13 | Ntn Corporation | Fluid bearing device and its manufacturing method |
| JP2009127860A (en) * | 2007-11-22 | 2009-06-11 | Taida Electronic Ind Co Ltd | Motor, and its bearing structure |
-
1995
- 1995-05-25 JP JP12613095A patent/JP3637632B2/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100516745B1 (en) * | 1996-12-25 | 2006-01-12 | 엔티엔 가부시키가이샤 | Dynamic Pressure Porous Oil Bearings & Bearings |
| WO2000004298A1 (en) * | 1998-07-17 | 2000-01-27 | Koninklijke Philips Electronics N.V. | Dynamic groove bearing comprising a porous lubricant reservoir |
| US6196723B1 (en) | 1998-07-17 | 2001-03-06 | U.S. Philips Corporation | Dynamic groove bearing comprising a porous lubricant reservoir |
| KR100721389B1 (en) * | 1998-07-17 | 2007-05-23 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | Dynamic groove bearing comprising a porous lubricant reservoir |
| JP2005083506A (en) * | 2003-09-09 | 2005-03-31 | Canon Inc | Air bearing device |
| JP2007057048A (en) * | 2005-08-25 | 2007-03-08 | Nidec Copal Electronics Corp | Fluid dynamic pressure bearing and motor comprising the same |
| WO2007102359A1 (en) * | 2006-03-09 | 2007-09-13 | Ntn Corporation | Fluid bearing device |
| JP2007239920A (en) * | 2006-03-09 | 2007-09-20 | Ntn Corp | Fluid bearing device |
| US8177434B2 (en) | 2006-03-09 | 2012-05-15 | Ntn Corporation | Fluid dynamic bearing device |
| KR101347146B1 (en) * | 2006-03-09 | 2014-01-03 | 엔티엔 가부시키가이샤 | Fluid bearing device |
| WO2007142062A1 (en) * | 2006-06-07 | 2007-12-13 | Ntn Corporation | Fluid bearing device and its manufacturing method |
| US8529132B2 (en) | 2006-06-07 | 2013-09-10 | Ntn Corporation | Fluid dynamic bearing device and method of manufacturing the same |
| KR101405075B1 (en) * | 2006-06-07 | 2014-06-10 | 엔티엔 가부시키가이샤 | Fluid bearing device and its manufacturing method |
| JP2009127860A (en) * | 2007-11-22 | 2009-06-11 | Taida Electronic Ind Co Ltd | Motor, and its bearing structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3637632B2 (en) | 2005-04-13 |
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