JP5194196B2 - 磁気粘性流体及びこれを用いたクラッチ - Google Patents
磁気粘性流体及びこれを用いたクラッチ Download PDFInfo
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- JP5194196B2 JP5194196B2 JP2012538124A JP2012538124A JP5194196B2 JP 5194196 B2 JP5194196 B2 JP 5194196B2 JP 2012538124 A JP2012538124 A JP 2012538124A JP 2012538124 A JP2012538124 A JP 2012538124A JP 5194196 B2 JP5194196 B2 JP 5194196B2
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- IQQRAVYLUAZUGX-UHFFFAOYSA-N 1-butyl-3-methylimidazolium Chemical class CCCCN1C=C[N+](C)=C1 IQQRAVYLUAZUGX-UHFFFAOYSA-N 0.000 description 1
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- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
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- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 description 1
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- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/44—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids
- H01F1/447—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids characterised by magnetoviscosity, e.g. magnetorheological, magnetothixotropic, magnetodilatant liquids
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D37/00—Clutches in which the drive is transmitted through a medium consisting of small particles, e.g. centrifugally speed-responsive
- F16D37/008—Clutches in which the drive is transmitted through a medium consisting of small particles, e.g. centrifugally speed-responsive the particles being carried by a fluid, to vary viscosity when subjected to electric change, i.e. electro-rheological or smart fluids
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D37/00—Clutches in which the drive is transmitted through a medium consisting of small particles, e.g. centrifugally speed-responsive
- F16D37/02—Clutches in which the drive is transmitted through a medium consisting of small particles, e.g. centrifugally speed-responsive the particles being magnetisable
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D37/00—Clutches in which the drive is transmitted through a medium consisting of small particles, e.g. centrifugally speed-responsive
- F16D2037/005—Clutches in which the drive is transmitted through a medium consisting of small particles, e.g. centrifugally speed-responsive characterised by a single substantially radial gap in which the fluid or medium consisting of small particles is arranged
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Soft Magnetic Materials (AREA)
Description
第1の磁性粒子には、平均粒子径が6.0μmのカルボニル鉄粉(ニューメタルスエンドケミカルス社製:UN3189)を用いた。第2の磁性粒子には以下のようにして形成した平均粒子径が0.1μmのFeナノ粒子を用いた。なお、平均粒子径はBET(Brunauer-Emmett-Teller)法により求めた。
<評価方法>
高せん断速度における測定が可能な自社製の回転粘度計を用いて、高せん断速度域におけるトルクを評価した。回転粘度計は、第1円板と、この第1円板に相対して所定の間隔をおいて配置された第2円板とを有している。第1円板は溝部を有し、その回転軸はサーボモーターと接続されている。第2円板は第1円板の溝部と相対する位置に凸部を有し、その回転軸にはトルクセンサが取り付けられている。溝部にMR流体を配置した状態で、第1円板と第2円板とを相対回転させることによりトルクが測定できる。円板の間隔は370μmとし、MR流体に磁場をかけずに測定を行った。測定の際のせん断速度は9000s-1とした。せん断速度は、第2円板の回転速度を既知の回転速度センサを用いて測定し、得られた測定値から計算した。トルクセンサによる測定を開始した4秒後に円板の回転を開始し、測定開始から15秒後から30秒後までの測定値の平均値をトルク値とした。測定開始から15秒後(回転開始から11秒後)以降の値を用いるのは、装置のシールに起因するトルクの変動を安定させるためである。
第1の磁性粒子として、平均粒径が2.0μmのカルボニル鉄粉(BASF社製:Softgrade SM)を用い、第2の磁性粒子として、平均粒子径が0.1μmのFeナノ粒子を用い、せん断応力の測定と同様にしてMR流体Fを調製した。Feナノ粒子はせん断応力を測定する際に用いたものと同じ方法により形成した。第1の磁性粒子及び第2の磁性粒子の総重量に対する第2の磁性粒子の重量比は、5wt%とした。
図5〜図8はそれぞれ、MR流体F〜Iについて回転粘度計により測定したトルクの経時変化を示している。第2の磁性粒子粒子を混合していないMR流体G及びIは、MR流体F及びHと比べてトルクの変動が大きくなった。
<評価方法>
容器にMR流体を入れ、3日間静置した。その後、全体の高さ及び上澄み部分の高さを測定し、以下の式を用いて沈降率を算出した。
沈降率(%)=(全体の高さ−上澄み部分の高さ)/全体の高さ×100
沈降率が大きいほど、磁性粒子が沈降しにくく、安定したMR流体であることを示す。
せん断応力の測定に用いたMR流体A〜Eについて、沈降率を測定した結果を図9に示す。第2の磁性粒子を加えていないMR流体Aの沈降率は57%であったが、第2の磁性粒子を添加することにより沈降率は大きく改善した。第2の磁性粒子を2wt%含むMR流体Bでは75%、5wt%含むMR流体Cでは80%、10wt%含むMR流体Dでは86%、20wt%含むMR流体Eでは95%となった。
12 水冷銅ハース
13 容器
14 直流電源
15 ガス循環ポンプ
16 粒子捕集器
18 アークプラズマ
21 金属材料
101 入力軸
102 出力軸
103 電磁石
104 オイルシール
105 MR流体
111 外筒
121 ローター
Claims (5)
- 磁性粒子混合体と、
前記磁性粒子混合体を分散させる分散媒とを備え、
前記磁性粒子混合体は、第1の磁性粒子及び第2の磁性粒子を含み、
前記第1の磁性粒子は、平均粒子径が1μm以上且つ50μm以下であり、
前記第2の磁性粒子は、平均粒子径が50nm以上且つ200nm以下であり、
前記第2の磁性粒子の前記磁性粒子混合体に占める割合は2wt%以上且つ10wt%以下であり、
前記第2の磁性粒子は、マグネタイト粒子、又はアークプラズマ法により形成した鉄微粒子からなる、磁気粘性流体。 - 前記第1の磁性粒子は、カルボニル鉄粉からなる、請求項1に記載の磁気粘性流体。
- 前記第2の磁性粒子は、その表面に表面改質層を有している、請求項1又は2に記載の磁気粘性流体。
- 前記表面改質層は、前記第2の磁性粒子の表面に結合された炭化水素鎖を有する化合物からなる、請求項3に記載の磁気粘性流体。
- 相対回転可能な第1の部材及び第2の部材と、
前記第1の部材と前記第2の部材との間に充填された磁気粘性流体と、
前記磁気粘性流体に磁場を加える磁場発生部とを備え、
前記磁気粘性流体は、請求項1〜4のいずれか1項に記載の磁気粘性流体である、クラッチ。
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JP2012538124A JP5194196B2 (ja) | 2011-03-08 | 2012-03-01 | 磁気粘性流体及びこれを用いたクラッチ |
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PCT/JP2012/001408 WO2012120842A1 (ja) | 2011-03-08 | 2012-03-01 | 磁気粘性流体及びこれを用いたクラッチ |
JP2012538124A JP5194196B2 (ja) | 2011-03-08 | 2012-03-01 | 磁気粘性流体及びこれを用いたクラッチ |
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US (1) | US9123462B2 (ja) |
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WO (1) | WO2012120842A1 (ja) |
Cited By (1)
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JP2013181598A (ja) * | 2012-03-01 | 2013-09-12 | Kurimoto Ltd | 磁気粘性流体及びこれを用いたクラッチ |
Families Citing this family (8)
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JP5194196B2 (ja) | 2011-03-08 | 2013-05-08 | 株式会社栗本鐵工所 | 磁気粘性流体及びこれを用いたクラッチ |
JP5913154B2 (ja) * | 2013-02-28 | 2016-04-27 | 株式会社栗本鐵工所 | 磁気粘性流体及びこれを用いたクラッチ |
JP6255715B2 (ja) * | 2013-05-17 | 2018-01-10 | 国立大学法人 名古屋工業大学 | 磁気機能性流体およびそれを用いたダンパ、クラッチ |
JP6163072B2 (ja) * | 2013-09-26 | 2017-07-12 | 株式会社イチネンケミカルズ | 高粘性変化性の磁気粘性流体 |
JP6057938B2 (ja) | 2014-03-20 | 2017-01-11 | 株式会社栗本鐵工所 | 磁気粘性流体及びこれを用いたクラッチ |
CN109564807B (zh) | 2016-07-21 | 2020-10-02 | 株式会社栗本铁工所 | 磁流变液 |
JP6722415B2 (ja) * | 2016-10-19 | 2020-07-15 | 株式会社免制震ディバイス | 積層ゴム免震装置 |
JP7117226B2 (ja) * | 2018-11-12 | 2022-08-12 | 株式会社フジミインコーポレーテッド | 粉末積層造形に用いるための粉末材料、これを用いた粉末積層造形法および造形物 |
Citations (4)
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