JP5285871B2 - 気体動圧軸受機構、及びそれを備えたモータ - Google Patents
気体動圧軸受機構、及びそれを備えたモータ Download PDFInfo
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- JP5285871B2 JP5285871B2 JP2007139463A JP2007139463A JP5285871B2 JP 5285871 B2 JP5285871 B2 JP 5285871B2 JP 2007139463 A JP2007139463 A JP 2007139463A JP 2007139463 A JP2007139463 A JP 2007139463A JP 5285871 B2 JP5285871 B2 JP 5285871B2
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- 230000007246 mechanism Effects 0.000 title claims description 50
- 230000005494 condensation Effects 0.000 claims description 33
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- 230000004323 axial length Effects 0.000 claims description 6
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- 230000002093 peripheral effect Effects 0.000 description 15
- 230000006835 compression Effects 0.000 description 14
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- 238000002474 experimental method Methods 0.000 description 11
- 238000006073 displacement reaction Methods 0.000 description 10
- 238000010008 shearing Methods 0.000 description 7
- 238000004088 simulation Methods 0.000 description 7
- 230000033001 locomotion Effects 0.000 description 6
- 230000001050 lubricating effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
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- 230000006837 decompression Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/10—Sliding-contact bearings for exclusively rotary movement for both radial and axial load
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
- F16C17/026—Sliding-contact bearings for exclusively rotary movement for radial load only with helical grooves in the bearing surface to generate hydrodynamic pressure, e.g. herringbone grooves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
- F16C17/045—Sliding-contact bearings for exclusively rotary movement for axial load only with grooves in the bearing surface to generate hydrodynamic pressure, e.g. spiral groove thrust bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/10—Construction relative to lubrication
- F16C33/1005—Construction relative to lubrication with gas, e.g. air, as lubricant
- F16C33/101—Details of the bearing surface, e.g. means to generate pressure such as lobes or wedges
- F16C33/1015—Pressure generating grooves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/10—Construction relative to lubrication
- F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
- F16C33/106—Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid
- F16C33/107—Grooves for generating pressure
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Sliding-Contact Bearings (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Description
図8から、使用状態における相対湿度RH=60%では、結露発生圧力が約1.7atmである。したがって、これを一時的にせよこの圧力を下回る状態を作り出すことが必要である。
(1)軸受内(軸受隙間hの空間を表す。)の他方向(軸受隙間hの空間のx,y方向)に比べ隙間方向(z方向)が十分小さく2次元として扱える、
(2)軸受内の気体の流れが完全に発達した境界層の流れである、
(3)気体に作用する力は、圧力勾配による力と粘性力とし、慣性力は無視し、さらに粘性力はせん断力のみで他は無視する、
の条件にて導き出されたレイノルズ方程式である軸受シミュレーションの基本方程式(数1)により計算し求めた圧力である。
(イ)主な緒元を表2に示すような気体動圧軸受機構1において、回転数60krpmおよび回転数70krpmで回転させて実験を行った。
10 回転シャフト(回転軸)
10a,10b,10c へリングボーン溝
20 固定スリーブ(固定部材)
30 固定シャフト(固定部材)
31 ブッシュ
32 回路基板
33 巻き線
34 アキシャルマグネット
40 回転スリーブ(回転軸)
41 ハブ
42 ポリゴンミラー
43 ミラー押さえばね
44,45 バックヨーク
46 マグネット
47 アキシャルマグネット
48 カバー
300 モータ
Claims (5)
- 回転軸と、該回転軸の面と所定の軸受隙間を置いて相対する面を有する固定部材と、該回転軸の面にその回転方向に等間隔に配置された本数N本の溝で構成され前記軸受隙間に回転したときに動圧を発生させるヘリングボーン溝と、を含む気体動圧軸受機構であって、
前記へリングボーン溝を構成する本数N本の溝は、前記回転軸の軸方向の一端部の縁を一端とし該回転軸の軸方向の中央に向けて所定吸入角β(0<β≦90度)で、前記溝の軸方向の長さと該回転軸の軸径との比がα(0.2<α<0.8)で設けられており、さらに、
前記溝は、ほぼ周囲湿度60%RHの環境下で前記回転軸がM(40<M≦60:単位krpm)の回転数で回転したときに発生する前記軸受隙間内の動圧変化の極大圧力値が現れる位置で、前記極大圧力値と交互に現れるN個の極小圧力値が、結露する圧力値1.7atm以下となる間隔になる本数Nで構成されることを特徴とする気体動圧軸受機構。 - 前記Nは、3〜5のいずれかの整数であることを特徴とする請求項1に記載の気体動圧軸受機構。
- 回転軸と、該回転軸の面と所定の軸受隙間を置いて相対する面を有する固定部材と、該回転軸の面にその回転方向に等間隔に配置された本数N本の溝で構成され前記軸受隙間に回転したときに動圧を発生させるヘリングボーン溝とを含む気体動圧軸受機構を有し、前記回転軸に取り付けられる、レーザ光を走査する走査部材、又は風を吹き付けるファンを回転させるために利用されるモータであって、
前記へリングボーン溝は、本数N本の溝からなり、各該溝は、前記回転軸の軸方向の一端部の縁を一端とし該回転軸の軸方向の中央に向けて吸入角β(0<β≦90度)で、前記該溝の軸方向の長さと該回転軸の軸径との比αがほぼ0.2〜0.8の範囲に設けられ、
さらに、前記溝の本数Nは、ほぼ、周囲温度が60℃以下、周囲湿度60%RHの環境下で前記回転軸がM(40<M≦60:単位krpm)の回転数で回転したときに発生する前記軸受隙間内の動圧変化の極大圧力値が現れる位置で、前記極大圧力値と交互に現れるN個の極小圧力値が1.7atm以下となる間隔になる数で構成されることを特徴とするモータ。 - 前記円周方向に等間隔で配置された前記各溝の該円周方向の長さの合計が、前記回転軸の円周の長さより短くされていることを特徴とする請求項3に記載のモータ。
- 前記Nは、3〜5のいずれかの整数であることを特徴とする請求項3又は4に記載のモータ。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007139463A JP5285871B2 (ja) | 2007-05-25 | 2007-05-25 | 気体動圧軸受機構、及びそれを備えたモータ |
PCT/JP2008/001264 WO2008146468A1 (ja) | 2007-05-25 | 2008-05-21 | 気体動圧軸受機構を備えたモータ |
CN2008800174947A CN101743682B (zh) | 2007-05-25 | 2008-05-21 | 具备气体动压轴承机构的马达 |
US12/451,665 US8449189B2 (en) | 2007-05-25 | 2008-05-21 | Motor with aerodynamic pressure bearing mechanism |
Applications Claiming Priority (1)
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---|---|---|---|
JP2007139463A JP5285871B2 (ja) | 2007-05-25 | 2007-05-25 | 気体動圧軸受機構、及びそれを備えたモータ |
Publications (2)
Publication Number | Publication Date |
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JP2008291946A JP2008291946A (ja) | 2008-12-04 |
JP5285871B2 true JP5285871B2 (ja) | 2013-09-11 |
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JP2007139463A Active JP5285871B2 (ja) | 2007-05-25 | 2007-05-25 | 気体動圧軸受機構、及びそれを備えたモータ |
Country Status (4)
Country | Link |
---|---|
US (1) | US8449189B2 (ja) |
JP (1) | JP5285871B2 (ja) |
CN (1) | CN101743682B (ja) |
WO (1) | WO2008146468A1 (ja) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5770039B2 (ja) * | 2011-07-27 | 2015-08-26 | 日本電産コパル電子株式会社 | 空気動圧軸受および該空気動圧軸受を用いた送風機 |
JP2015014370A (ja) * | 2014-09-09 | 2015-01-22 | サムスン電機ジャパンアドバンスドテクノロジー株式会社 | ディスク駆動装置 |
JP6618757B2 (ja) * | 2015-10-15 | 2019-12-11 | 株式会社三共製作所 | 流体動圧軸受 |
JP2020165471A (ja) | 2019-03-29 | 2020-10-08 | 日本電産株式会社 | 気体動圧軸受、モータおよび送風装置 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0833266A (ja) * | 1994-07-15 | 1996-02-02 | Toshiba Corp | 動圧軸受形モータ及びポリゴンミラー駆動用スキャナモータ |
JP3069039B2 (ja) * | 1996-02-02 | 2000-07-24 | 日本電産コパル電子株式会社 | 動圧気体軸受 |
JPH11190329A (ja) * | 1997-12-25 | 1999-07-13 | Copal Electron Co Ltd | 周回流型の動圧軸受 |
JP3539876B2 (ja) * | 1998-09-17 | 2004-07-07 | 日本電産株式会社 | ディスク駆動装置 |
JP2003222124A (ja) * | 1999-07-14 | 2003-08-08 | Sumitomo Electric Ind Ltd | スピンドルモータ |
KR20010080462A (ko) * | 1999-09-17 | 2001-08-22 | 오카야마 노리오 | 기동 특성을 개선한 동압 베어링 |
JP2001330026A (ja) * | 2000-05-19 | 2001-11-30 | Tokyo Parts Ind Co Ltd | 動圧軸受と動圧軸受を用いたスピンドルモータ |
CN2617988Y (zh) * | 2003-06-02 | 2004-05-26 | 奇臻微机电股份有限公司 | 气体动压轴承结构 |
WO2006049114A1 (ja) * | 2004-11-02 | 2006-05-11 | Matsushita Electric Industrial Co., Ltd. | スラスト動圧軸受およびこれを用いたスピンドルモータならびにこのスピンドルモータを用いた情報記録再生装置 |
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2007
- 2007-05-25 JP JP2007139463A patent/JP5285871B2/ja active Active
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2008
- 2008-05-21 WO PCT/JP2008/001264 patent/WO2008146468A1/ja active Application Filing
- 2008-05-21 US US12/451,665 patent/US8449189B2/en active Active
- 2008-05-21 CN CN2008800174947A patent/CN101743682B/zh active Active
Also Published As
Publication number | Publication date |
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US20100166348A1 (en) | 2010-07-01 |
WO2008146468A1 (ja) | 2008-12-04 |
CN101743682B (zh) | 2012-07-18 |
CN101743682A (zh) | 2010-06-16 |
US8449189B2 (en) | 2013-05-28 |
JP2008291946A (ja) | 2008-12-04 |
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