JP2007071275A - 流体軸受装置用ハウジング - Google Patents
流体軸受装置用ハウジング Download PDFInfo
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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
- F16C17/102—Sliding-contact bearings for exclusively rotary movement for both radial and axial load with grooves in the bearing surface to generate hydrodynamic pressure
- F16C17/107—Sliding-contact bearings for exclusively rotary movement for both radial and axial load with grooves in the bearing surface to generate hydrodynamic pressure with at least one surface for radial load and at least one surface for 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
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/02—Rigid support of bearing units; Housings, e.g. caps, covers in the case of sliding-contact 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
- 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
- F16C43/00—Assembling bearings
- F16C43/02—Assembling sliding-contact bearings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
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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
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Sliding-Contact Bearings (AREA)
- Mounting Of Bearings Or Others (AREA)
- Motor Or Generator Frames (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
【解決手段】 80℃の雰囲気温度で80MPaの面圧を168時間負荷した際の圧縮クリープ量が8%以下である樹脂組成物で形成されたハウジングは、製品寿命相当期間使用した後も、圧入力を伴って固定された他部材、例えば、ハウジング内周に圧入された軸受スリーブと十分な固定力を有する。よって、ハウジングと他部材との固定位置がずれることはなく、長期間に渡り高い軸受性能が保たれる。
【選択図】図8
Description
(1)溶融樹脂を混練して射出成形する際には、炭素繊維が裁断されて短繊維化する。短繊維化が進行すると、強度や導電性等の低下が顕著となり、これらの要求特性を満足することが難しくなる。従って、樹脂に配合する炭素繊維としては、成形時の繊維の折れを見込んで長めの繊維を使用することが好ましく、具体的には平均繊維長100μm以上(より好ましくは1mm以上)の炭素繊維を使用するのが望ましい。
(2)その一方、射出成形工程においては、金型内で硬化した樹脂を取り出し、これを再度溶融させ、バージン樹脂組成物と混練して再使用(リサイクル使用)する場合がある。この場合、一部の繊維は繰返しリサイクルされることになるので、樹脂中の当初の繊維長が長すぎる場合には、リサイクルに伴う裁断により、繊維が当初の繊維長に比べて著しく短くなって、樹脂組成物の特性変化(溶融粘度の低下等)が顕著になる。特に溶融粘度の低下は、寸法精度に影響する重要な特性である。かかる特性変化を最小限に抑えるため、繊維長はある程度短い方が好ましく、具体的には平均繊維長を500μm以下(好ましくは300μm以下)とするのが望ましい。
(i)ベース樹脂種及び溶融粘度(測定温度、せん断速度、溶融粘度)
リニア型ポリフェニレンサルファイド(PPS):大日本インキ化学工業(株)製、グレード;LC−5G(310℃、103s-1、280Pa・s)
架橋型PPS:大日本インキ化学工業(株)製、グレード;T−4(310℃、103s-1、100Pa・s)
ポリエーテルエーテルケトン(PEEK):ビクトレックス・エムシー(株)製、150P(380℃、103s-1、120Pa・s)
液晶ポリマー(LCP):ポリプラスチックス(株)製、グレード;A950(310℃、103s-1、40Pa・s)
66ナイロン(PA66):BASF(株)製、グレード;A3(280℃、103s-1、100Pa・s)
(ii)充填剤
炭素繊維(PAN系):東邦テナックス(株)製、グレード;HM35−C6S、繊維径;7μm、平均繊維長;6mm、アスペクト比;857、引張り強さ;3240MPa
ガラス繊維:旭ファイバーグラス(株)製、グレード;CS03MA497、繊維径;13μm、平均繊維長;3mm、アスペクト比;230、引張り強さ;3450MPa
カーボンブラック:三菱化学(株)製、グレード;#3350B、粒子径;24nm
アルボレックス:四国化成工業(株)製、グレード;Y、主要構成要素;ホウ酸アルミニウム、平均径0.5〜1μm、平均繊維長;10〜30μm、アスペクト比;10〜60
(1)底部の下端面中央部にピンゲートが設けられた、上端開口のカップ状試験片(φ10mm(外径)×高さ15mm、側部厚さ1mm、底部厚さ2mm)を、図7に示す組成の材料で射出成形し、これを抜去力測定用の試験片とする。
(2)カップ状試験片の内周に、焼結金属製の軸受スリーブを圧入する。このときの軸受スリーブの外径寸法は、カップ状試験片との圧入代が0.2%となるように設定される。これを、雰囲気温度が130℃の恒温槽に投入し、5000h放置する。なお、この試験条件(130℃、5000h)は、一般的な使用雰囲気温度の上限・90℃と製品寿命・10年とから算出して設定されたものである。また、より実際の形態に近づけるために、圧入部に接着剤(例えば、嫌気性接着剤やエポキシ系接着剤)を介在させてもよい。ここでは、接着剤を使用しない方法で評価する。
(3)軸受スリーブの圧入直後に測定した軸受スリーブのカップ状試験片からの抜去力F0および、恒温層内で5000h放置後の軸受スリーブのカップ状試験片からの抜去力Fを、引張圧縮試験機で計測する。
(4)下記の数式に従って、各材料の抜去力低下率を計算し、この値に基づいて耐クリープ特性を評価する。
抜去力低下率:D(%)=((F0−F)/F0)×100
上式において、放置後の抜去力Fが0(N)となった場合、軸受スリーブの抜去力低下率Dは100%となる。合否判定基準は、抜去力低下率Dが90%以下なら合格(○)、90%を越えたら不合格(×)とした。
(1)図7に示す組成の材料で射出成形し、上端面に直径2mmのピンゲートを備えたφ10mm×高さ2mmの円柱状試験片を製作する。ピンゲート除去後、#2000のエメリー紙にて両端面を研磨し、これを圧縮クリープ量測定用の試験片とする。
(2)予め使用する冶具一式を80℃に余熱しておく。十分に剛性のある、具体的には測定荷重を加えても変位が2μm以内である定盤上に円柱状試験片を置き、両面を表面粗さが0.05μmとなるよう研磨したφ20mm×高さ10mmのSS製円盤を円柱状試験片の上に置く。この状態で、1/100mmまで測定可能なダイヤルゲージを定盤に設置し、円柱状試験片の初期高さL0を測定する。
(3)雰囲気温度を80℃に保ったまま、試験片の面圧が所定の値(本試験では80MPa)となるように、SS製円盤上から荷重を加える。その状態で168h放置した後、ダイヤルゲージで荷重負荷後の円柱状試験片の高さL168を測定する。
(4)以上で求めたL0およびL168をもとに、下記の数式に従って圧縮クリープ量を求めた。
圧縮クリープ量:C(%)=100×(L0−L168)/L0
2 軸
3 回転部材
4 ステータコイル
5 ロータマグネット
6 モータブラケット
7 ハウジング
8 軸受スリーブ
9 ハブ部
10 蓋部材
R1、R2 ラジアル軸受部
T1、T2 スラスト軸受部
S シール空間
Claims (5)
- 他部材と圧入力を伴って固定される流体軸受装置用ハウジングであって、
少なくとも他部材と圧入力を伴って接する部分が樹脂組成物で形成され、前記樹脂組成物は、80℃の雰囲気温度で80MPaの面圧を168時間負荷した際の圧縮クリープ量が8%以下であることを特徴とする流体軸受装置用ハウジング。 - 前記樹脂組成物の体積抵抗率が107Ω・cm以下である請求項1記載の流体軸受装置用ハウジング。
- 前記樹脂組成物は、ポリフェニレンサルファイド(PPS)をベース樹脂としたものである請求項1記載の流体軸受装置用ハウジング。
- 請求項1〜4何れかに記載の流体軸受装置用ハウジングと、ハウジングの内周に固定される軸受スリーブと、軸とを備えた流体軸受装置。
- 請求項4記載の流体軸受装置と、ロータマグネットと、ステータコイルとを有するモータ。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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JP2005257853A JP4901162B2 (ja) | 2005-09-06 | 2005-09-06 | 流体軸受装置及びこれを備えたモータ |
KR1020087003110A KR101289733B1 (ko) | 2005-09-06 | 2006-04-11 | 유체 베어링 장치용 하우징 |
CN2006800279901A CN101238300B (zh) | 2005-09-06 | 2006-04-11 | 用于流体动压轴承装置的壳体 |
US12/063,073 US20090302697A1 (en) | 2005-09-06 | 2006-04-11 | Housing for fluid dynamic bearing device |
PCT/JP2006/307655 WO2007029371A1 (ja) | 2005-09-06 | 2006-04-11 | 流体軸受装置用ハウジング |
US13/361,503 US8778242B2 (en) | 2005-09-06 | 2012-01-30 | Housing for fluid dynamic bearing device |
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JP2005257853A JP4901162B2 (ja) | 2005-09-06 | 2005-09-06 | 流体軸受装置及びこれを備えたモータ |
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JP2007071275A true JP2007071275A (ja) | 2007-03-22 |
JP4901162B2 JP4901162B2 (ja) | 2012-03-21 |
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US (2) | US20090302697A1 (ja) |
JP (1) | JP4901162B2 (ja) |
KR (1) | KR101289733B1 (ja) |
CN (1) | CN101238300B (ja) |
WO (1) | WO2007029371A1 (ja) |
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KR20140087292A (ko) * | 2012-12-28 | 2014-07-09 | 삼성전기주식회사 | 스핀들 모터 |
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JPH0544716A (ja) * | 1991-08-19 | 1993-02-23 | Nippon Seiko Kk | 動圧みぞ形すべり軸受 |
JPH09329146A (ja) * | 1996-06-06 | 1997-12-22 | Hitachi Powdered Metals Co Ltd | 内径溝付き軸受の製造方法及び内径溝付き軸受ユニット |
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US6390681B1 (en) * | 1999-04-05 | 2002-05-21 | Ntn Corporation | Dynamic pressure bearing-unit |
JP2003314534A (ja) | 2002-04-17 | 2003-11-06 | Sony Corp | 軸受けユニット、軸受けユニットを有するモータおよび電子機器 |
KR100968163B1 (ko) * | 2002-04-23 | 2010-07-06 | 엔티엔 가부시키가이샤 | 유체 베어링 장치 |
JP2004236390A (ja) * | 2003-01-29 | 2004-08-19 | Tokyo Parts Ind Co Ltd | 小型ブラシレスモータ |
JP2005003042A (ja) * | 2003-06-10 | 2005-01-06 | Ntn Corp | 動圧軸受装置 |
WO2005098251A1 (ja) * | 2004-03-30 | 2005-10-20 | Ntn Corporation | 動圧軸受装置 |
US7819585B2 (en) * | 2004-05-25 | 2010-10-26 | Ntn Corporation | Fluid dynamic bearing apparatus and a motor using the same |
JP2006070986A (ja) * | 2004-09-01 | 2006-03-16 | Ntn Corp | 動圧軸受装置用軸部材 |
JP4531584B2 (ja) * | 2005-02-17 | 2010-08-25 | Ntn株式会社 | 流体動圧軸受装置およびこれを備えたモータ |
JP5095115B2 (ja) * | 2006-03-27 | 2012-12-12 | Ntn株式会社 | 動圧軸受装置 |
JP2007263228A (ja) * | 2006-03-28 | 2007-10-11 | Ntn Corp | 動圧軸受装置 |
JP2008008368A (ja) * | 2006-06-28 | 2008-01-17 | Ntn Corp | 動圧軸受装置 |
US20100226601A1 (en) * | 2006-09-12 | 2010-09-09 | Ntn Corporation | Fluid dynamic bearing device |
-
2005
- 2005-09-06 JP JP2005257853A patent/JP4901162B2/ja active Active
-
2006
- 2006-04-11 WO PCT/JP2006/307655 patent/WO2007029371A1/ja active Application Filing
- 2006-04-11 KR KR1020087003110A patent/KR101289733B1/ko active IP Right Grant
- 2006-04-11 CN CN2006800279901A patent/CN101238300B/zh active Active
- 2006-04-11 US US12/063,073 patent/US20090302697A1/en not_active Abandoned
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2012
- 2012-01-30 US US13/361,503 patent/US8778242B2/en active Active
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JPH0544716A (ja) * | 1991-08-19 | 1993-02-23 | Nippon Seiko Kk | 動圧みぞ形すべり軸受 |
JPH09329146A (ja) * | 1996-06-06 | 1997-12-22 | Hitachi Powdered Metals Co Ltd | 内径溝付き軸受の製造方法及び内径溝付き軸受ユニット |
WO2004092600A1 (ja) * | 2003-03-31 | 2004-10-28 | Ntn Corporation | 流体軸受装置 |
Also Published As
Publication number | Publication date |
---|---|
KR20080058325A (ko) | 2008-06-25 |
US20090302697A1 (en) | 2009-12-10 |
CN101238300B (zh) | 2013-02-13 |
KR101289733B1 (ko) | 2013-07-26 |
WO2007029371A1 (ja) | 2007-03-15 |
US20120126443A1 (en) | 2012-05-24 |
JP4901162B2 (ja) | 2012-03-21 |
CN101238300A (zh) | 2008-08-06 |
US8778242B2 (en) | 2014-07-15 |
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