JP5305314B2 - 流体軸受用潤滑流体、それを用いた流体軸受及びモータ並びに流体軸受の潤滑方法 - Google Patents
流体軸受用潤滑流体、それを用いた流体軸受及びモータ並びに流体軸受の潤滑方法 Download PDFInfo
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Images
Classifications
-
- 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
- F16C33/109—Lubricant compositions or properties, e.g. viscosity
-
- 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
-
- 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
- F16C2370/00—Apparatus relating to physics, e.g. instruments
- F16C2370/12—Hard disk drives or the like
Description
下記一般式(1):
R1-O-CO-(CH2)n-S-(CH2)m-CO-O-R2・・・(1)
[式中、R1及びR2はそれぞれ独立にその構造中に硫黄原子を含んでもよい炭素数6〜10のアルキル基であり、nおよびmはそれぞれ独立に1〜2の整数である。]で表される化合物を基油として含有する流体軸受用潤滑流体(以下単に潤滑流体という場合がある)であって、40℃での動粘度が5〜100mm2/sで、酸価が5mgKOH/g以下であることを特徴とし、好ましくは、40℃の動粘度が8〜15mm2/sで、酸価が1mgKOH/g以下で、粘度指数が100以上で且つ流動点が-30℃以下である。
下記一般式(2):
R3-O-CO-(CH2)n-S-(CH2)m-CO-O-R4・・・(2)
[式中、R3はその構造中に硫黄原子を含んでもよい炭素数6〜10のモノ又はポリオキシアルキレン基であり、R4はその構造中に硫黄原子を含んでもよい炭素数6〜10のアルキル基及びモノ又はポリオキシアルキレン基であり、nおよびmはそれぞれ独立に1〜2の整数である。]で表される化合物を基油として含有する流体軸受用潤滑流体(以下単に潤滑流体という場合がある)であって、40℃での動粘度が5〜100mm2/sで、酸価が5mgKOH/g以下であることを特徴とし、好ましくは、40℃の動粘度が8〜15mm2/sで、酸価が1mgKOH/g以下で、粘度指数が100以上で且つ流動点が-30℃以下である。
限定されるものではない。
添加剤A:n-オクタデシル−3−(3,5−ジ−tert−ブチル−4−ヒドロキシフェニル)
添加剤B:ジオクチルジフェニルアミン
添加剤C:トリクレジルホスファイト
添加剤D:ベンゾトリアゾール誘導体
添加剤E:トリメチロールプロパン由来グリシジルポリエーテル
2) -40℃動粘度:ASTM D 5133に準じ、スキャンニングブッルクフィールド粘度計を用い絶対粘度を測定し、それぞれの密度より動粘度を算出した。
3) 熱安定性試験:内径30mm、高さ40mmのビーカーに、試料油を5g入れ、150℃の回転盤付恒温槽に3日間静置し、蒸発量の観察及びJIS K 2283に準じた動粘度測定を行い、試験前後での粘度変化率を算出した。粘度変化率は以下の式(3)により算出した。
粘度変化率(%)=〔(試験後動粘度−試験前動粘度)/試験前動粘度〕 × 100 ・・式(3)
4) 流動点:JIS K 2269に準じて測定した。
5) 熱安定性試験(SUS):内径30mm、高さ40mmのビーカーに、試料油を5g、SUS304粉末(100 mesh)を1g入れ、150℃の回転盤付恒温槽に3日間静置し、蒸発量を観察した後、金属粉を除去し、JIS K 2283に準じた動粘度測定を行い、試験前後での粘度変化率を算出した。粘度変化率は上記の式(3)により算出した。
2 ブラケット
3 ロータハブ
4 ステータ
11 軸部材
12 スリーブ部材
13 スリーブ支持部材
14 スラストブッシュ部材
15 シール部材
111 軸部
112 スラストプレート部
121a,121b ラジアル動圧発生溝
121c,141 スラスト動圧発生溝
Claims (6)
- 流体軸受に用いられる潤滑流体であって、
下記一般式(2):
R3−O−CO−(CH2)n−S−(CH2)m−CO−O−R4・・・(2)
[式中、R3はその構造中に酸素原子を含む炭素数6〜10のアルキル基であり、R4 は 炭素数6〜10のアルキル基又はその構造中に酸素原子を含む炭素数6〜10のアルキル基であり、nおよびmはそれぞれ独立に1〜2の整数である。]で表される化合物を基油として潤滑流体全量基準で80重量%以上含有する流体軸受用潤滑流体。 - R 3 及びR 4 が共に酸素原子を含む炭素数6〜10のアルキル基である請求項1に記載の流体軸受用潤滑流体。
- R 3 及びR 4 が共に[(2−エチルヘキシル)オキシ]エチル基である請求項2に記載の流体軸受用潤滑流体。
- 軸部材とスリーブ部材とが回転自在に嵌合し、該スリーブ部材に設けられた軸受面と、該軸部材に設けられた軸受面とが、微小間隙を介して対向し、前記微小間隙には請求項1〜3のいずれか1項に記載の流体軸受用潤滑流体を用いることを特徴とする流体軸受。
- ステータを保持するブラケットと、該ブラケットに対して相対回転するロータと、該ロータに固着され該ステータと協働して回転磁界を発生するロータマグネットと、該ロータの回転を支持する流体軸受とを備えたモータにおいて、前記流体軸受は、請求項4に記載した流体軸受であることを特徴とするモータ。
- 請求項4に記載の流体軸受を請求項1〜3のいずれか1項に記載の流体軸受用潤滑流体を用いて潤滑することを特徴とする流体軸受の潤滑方法。
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