WO2021039852A1 - Composition de graisse, et procédé pour produire une composition de graisse et palier à roulement - Google Patents

Composition de graisse, et procédé pour produire une composition de graisse et palier à roulement Download PDF

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Publication number
WO2021039852A1
WO2021039852A1 PCT/JP2020/032209 JP2020032209W WO2021039852A1 WO 2021039852 A1 WO2021039852 A1 WO 2021039852A1 JP 2020032209 W JP2020032209 W JP 2020032209W WO 2021039852 A1 WO2021039852 A1 WO 2021039852A1
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Prior art keywords
grease composition
base oil
thickener
grease
formula
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PCT/JP2020/032209
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English (en)
Japanese (ja)
Inventor
一徳 三宅
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株式会社ジェイテクト
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Filing date
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Publication of WO2021039852A1 publication Critical patent/WO2021039852A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M115/00—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof
    • C10M115/08—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof containing nitrogen
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
    • C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
    • C10M133/22—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms containing a carbon-to-nitrogen double bond, e.g. guanidines, hydrazones, semicarbazones
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/06—Mixtures of thickeners and additives
    • 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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/24—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly
    • F16C19/26—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly with a single row of rollers
    • 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
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication

Definitions

  • the present invention relates to a grease composition, a method for producing the same, and a rolling bearing in which the grease composition is sealed.
  • Patent Document 1 describes a ball bearing for a motor, which contains a synthetic hydrocarbon oil and a urea-based compound and has a grease composition having an apparent viscosity of 45 Pa ⁇ s or less at ⁇ 30 ° C. The thing is filled.
  • the grease composition moves to the seal side during use and shifts to a channeling state, making it extremely difficult to supply oil to the contact surface between the raceway surface of the inner ring and the rolling element. Therefore, seizure may occur at an early stage.
  • conventional grease compositions it has been difficult to avoid such problems.
  • the present inventors have conducted diligent studies to solve the above problems, and have found that a grease composition containing niglosin can improve oil supplyability with almost no change in consistency.
  • the present invention has been completed.
  • the grease composition of the present invention Base oil and Diurea represented by the structural formula (1) as a thickener, and R 1- NHCONH-R 2- NHCONH-R 3 ... (1)
  • R 1 and R 3 are linear alkyl groups having 16 to 22 carbon atoms independently of each other, and R 2 is a functional group represented by the formula (2).
  • Including Nigrosin The content of the thickener is 13 to 25% by mass with respect to the total amount of the base oil and the thickener.
  • the content of the above niglocin is 0.5 to 7% by mass with respect to the total amount of the base oil and the thickener.
  • the grease composition of the present invention contains a predetermined amount of niglosin in addition to the base oil and the thickener. Therefore, the grease composition has an excellent oil supply property while having the same consistency as the grease composition having the same composition except that it does not contain niglocin. It is presumed that the reason for this is that in the above grease composition containing niglosin, one thickener is in a large size and a small number in the state of crystals.
  • the method for producing a grease composition of the present invention is A method for producing the above grease composition.
  • Solution A containing an aliphatic amine and a base oil represented by the following structural formula (3), and R 4- NH 2 ... (3) (In formula (3), R 4 is a linear alkyl group having 16 to 22 carbon atoms.)
  • Solution B containing 4,4'-diphenylmethane diisocyanate and base oil, To have a step of reacting an aliphatic amine with 4,4'-diphenylmethane diisocyanate. Before mixing the solution A and the solution B, niglosin is dissolved in at least one of the solution A and the solution B.
  • a production method having such a step is suitable for producing the grease composition of the present invention having a good oil supply property.
  • the rolling bearing of the present invention is a rolling bearing in which the above grease composition is sealed.
  • the rolling bearing according to the embodiment of the present invention is a ball bearing filled with grease made of the grease composition according to the embodiment of the present invention.
  • FIG. 1 is a cross-sectional view showing a ball bearing according to an embodiment of the present invention.
  • the ball bearing 1 includes an inner ring 2, an outer ring 3 provided on the radial outer side of the inner ring 2, a ball 4 as a plurality of rolling elements provided between the inner ring 2 and the outer ring 3, and these. It is provided with an annular cage 5 that holds the balls 4. Further, the ball bearing 1 is provided with seals 6 on one side and the other side in the axial direction, respectively. Further, the annular region 7 between the inner ring 2 and the outer ring 3 is filled with grease G made of the grease composition according to the embodiment of the present invention.
  • the inner ring 2 is formed with an inner raceway surface 21 on which the ball 4 rolls.
  • the outer ring 3 has an outer raceway surface 31 on which the ball 4 rolls.
  • a plurality of balls 4 are interposed between the inner track surface 21 and the outer track surface 31, and roll on the inner track surface 21 and the outer track surface 31.
  • the grease G sealed in the region 7 also intervenes in the contact points between the ball 4 and the inner raceway surface 21 of the inner ring 2 and the contact points between the ball 4 and the outer raceway surface 31 of the outer ring 3.
  • the grease G is sealed so as to occupy 20 to 40% by volume with respect to the volume of the space surrounded by the inner ring 2, the outer ring 3, and the seal 6 excluding the ball 4 and the cage 5. ..
  • the seal 6 is an annular member including an annular metal ring 6a and an elastic member 6b fixed to the metal ring 6a.
  • the radial outer portion is fixed to the outer ring 3, and the lip tip of the radial inner portion is an inner ring. It is attached to 2 so that it can be slidably contacted.
  • the seal 6 prevents the sealed grease G from leaking to the outside.
  • the ball bearing 1 configured in this way is filled with grease as grease G, which is composed of the grease composition according to the embodiment of the present invention described later. Therefore, the ball bearing 1 in which the grease G is sealed has contact points between the ball 4 and the outer raceway surface 31 of the outer ring 3 and the inner raceway surface 21 of the ball 4 and the inner ring 2 even during ultra-high speed rotation. Oil can be supplied to the contact points.
  • the grease composition constituting the grease G is the grease composition according to the embodiment of the present invention, and contains a base oil, a thickener, and niglosin. Since the grease composition contains niglocin, it has the same consistency as the grease composition having the same composition except that it does not contain niglocin, and is excellent in oil supply.
  • base oil examples include poly- ⁇ -olefin (PAO), ester oil, polyalkylene glycol, fluorine oil, silicone oil, ether oil and the like. Of these, poly- ⁇ -olefins (PAOs) are preferred. Poly- ⁇ -olefins are suitable because they are low in cost and have good heat resistance.
  • poly- ⁇ -olefin examples include those obtained by oligomerizing or polymerizing ⁇ -olefins such as 1-hexene, 1-octene, 1-nonene, 1-decene, 1-dodecene, and 1-tetradecene. Is a hydrogenated version of these.
  • PAO4 to PAO8 obtained by oligomerizing 1-decene are preferable.
  • the kinematic viscosity of the base oil at 40 ° C. is preferably 15 to 50 mm 2 / s.
  • the base oil is particularly suitable for being supplied to the contact portion between the rolling elements and the respective raceway surfaces of the inner and outer rings.
  • the kinematic viscosity of the base oil (40 ° C.) is more preferably 25 to 35 mm 2 / s.
  • the kinematic viscosity of the base oil is a value based on JIS K 2283 (2000).
  • the thickener is diurea represented by the following structural formula (1).
  • R 1- NHCONH-R 2- NHCONH-R 3 ...
  • R 1 and R 3 are linear alkyl groups having 16 to 22 carbon atoms independently of each other. That is, R 1 and R 3 are independent of each other and are any of linear hexadecyl group, heptadecyl group, octadecyl group, nonadecylic group, icosyl group, henicosyl group, and docosyl group. Both R 1 and R 3 are preferably octadecyl groups having 18 carbon atoms.
  • R 2 is a functional group represented by the following formula (2).
  • the diurea represented by the above structural formula (1) is a long-chain aliphatic diurea in which R 1 and R 3 are composed of an alkyl group having a relatively long carbon chain. Since the grease composition using such a long-chain aliphatic diurea has high oil-retaining property, it can be targeted with a small amount of thickener, and the life can be extended by increasing the amount of oil. It is suitable as a thickener constituting the above grease composition.
  • the diurea represented by the structural formula (1) is a reaction product of an aliphatic amine having 16 to 22 carbon atoms and 4,4'-diphenylmethane diisocyanate (hereinafter, also referred to as 4,4'-MDI).
  • the aliphatic amine is an aliphatic amine represented by the following structural formula (3).
  • R 4- NH 2 ... (3) (In formula (3), R 4 is a linear alkyl group having 16 to 22 carbon atoms.) That is, the aliphatic amine is hexadecylamine, heptadecylamine, octadecylamine, nonadecilamine, icosylamine, henicosylamine, or docosylamine.
  • the above aliphatic amines may be used alone or in combination of two or more.
  • the aliphatic amine and the diisocyanate compound can be reacted under various conditions, but the diurea compound having high uniform dispersibility as a thickener. Is obtained, so it is preferable to react in the base oil. Further, the reaction between the aliphatic amine and the diisocyanate compound may be carried out by adding the base oil in which the diisocyanate compound is dissolved to the base oil in which the aliphatic amine is dissolved, or the base oil in which the diisocyanate compound is dissolved. A base oil in which an aliphatic amine is dissolved may be added therein.
  • the content of the thickener is 13 to 25% by mass with respect to the total amount of the base oil and the thickener.
  • the content of the thickener is less than 13% by mass, when the grease composition is sealed in a rolling bearing and used, the oil supply property is improved, but the leakage resistance is insufficient and the grease composition leaks from the rolling bearing. It may end up.
  • the content of the thickener exceeds 25% by mass, the torque of the rolling bearing may increase, or the calorific value during rotation of the bearing may become excessive to accelerate the deterioration of the grease composition. ..
  • the grease composition contains niglosin.
  • Niglosin is an azine compound.
  • the oil supply property is improved with almost no change in consistency.
  • the grease composition has the same degree of consistency as the grease composition having the same composition except that it does not contain niglocin, and is excellent in oil supply property.
  • a commercially available product can also be used.
  • specific examples of commercially available products include, for example, NUBIAN (registered trademark) BLACK NH-805, NUBIAN BLACK NH-815, NUBIAN BLACK TN-870, NUBIAN BLACK TN-877, NUBIAN BLACK TH-807, and NUBIAN BLACK (NUBIAN BLACK).
  • Examples thereof include Black S, Black SF, and Black 109 (all manufactured by Chuo Synthetic Chemical Co., Ltd.). These may be used alone or in combination of two or more.
  • the content of the niglocin is 0.5 to 7% by mass with respect to the total amount of the base oil and the thickener. If the content of the niglocin is less than 0.5% by mass, the effect of the present invention for improving the oil supply property may not be enjoyed while maintaining the consistency. On the other hand, if the content of the niglosin exceeds 7% by mass, the bearing acoustic value is deteriorated and the life is shortened.
  • the content of the niglocin is preferably 1 to 5% by mass with respect to the total amount of the base oil and the thickener.
  • the grease composition further includes other additives such as rust preventive, antioxidant, dispersant, extreme pressure agent, oily agent, abrasion resistant agent, dye, hue stabilizer, thickener, and structural stability. It may contain an agent, a metal deactivator, a viscosity index improver and the like.
  • the mixing consistency (60W) of the above grease composition is not particularly limited, but it is preferably about 220 to 260 in that it is suitable for a grease composition for rolling bearings used under the harsh conditions as described above.
  • the mixing consistency (60W) can be measured by a method based on "7 Consistency test method" of JIS K 2220 (2013).
  • the degree of oil release (100 ° C. x 24 hours) of the grease composition is preferably 1% by mass or more. In this case, the grease composition will have excellent oil supply.
  • the degree of oil release is preferably 3% by mass or less. If the degree of oil release exceeds 3% by mass, oil leakage may be promoted and the life may be shortened.
  • the degree of oil release can be measured by a method based on "11 Oil release degree test method" of JIS K 2220 (2013).
  • Base oil, aliphatic amine, 4,4'-MDI, and niglosin are weighed as raw materials for the grease composition.
  • the base oil is divided into two containers A and B (for example, half the amount each).
  • Aliphatic amine is added to one container (container A), and 4,4'-MDI is added to the other container (container B).
  • Nigrosink is added to one or both of the two containers A and B.
  • niglocin when niglocin is added only to one of the two containers, niglocin may be added only to the container A or only to the container B.
  • the solution A in the container A and the solution B in the container B are mixed, and the aliphatic amine is reacted with 4,4'-MDI to synthesize diurea (thickener).
  • the temperature and time in the reaction of the aliphatic amine with 4,4'-MDI are not particularly limited, and the same conditions as those usually adopted in this type of reaction may be adopted.
  • the reaction temperature is preferably 150 ° C. to 170 ° C. from the viewpoint of solubility and volatility of the aliphatic amine and 4,4'-MDI.
  • the reaction time is 0.5 to 2.0 hours from the viewpoint of completing the reaction between the aliphatic amine and 4,4'-MDI and shortening the production time to efficiently produce the grease. preferable.
  • the grease composition containing niglosin can be produced.
  • the additives weighed in advance are used as various additives, such as after reacting an aliphatic amine with 4,4'-MDI. It may be added and mixed at an appropriate timing according to the situation.
  • the grease composition constituting the grease G sealed in the ball bearing 1 a grease composition containing a predetermined amount of niglosin in addition to the above-mentioned base oil and thickener is adopted.
  • the ball bearing 1 in which the grease G is sealed causes early seizure even when used in a harsh environment such as use under high-speed rotation conditions. Can be avoided.
  • the present invention is not limited to the above embodiment, and can be implemented in other embodiments.
  • the rolling bearing according to the embodiment of the present invention is not limited to a ball bearing filled with grease composed of the grease composition according to the embodiment of the present invention.
  • the rolling bearing is another rolling bearing such as a roller bearing in which a rolling element other than a ball is used as long as it is filled with grease made of the grease composition according to the embodiment of the present invention. Is also good.
  • the raw materials used for preparing the grease composition are as follows.
  • (Raw material for grease composition) (1) Base oil: Poly- ⁇ -olefin (PAO) PAO6 (manufactured by Ineos Oligomers, (trade name) Duracin 166 polyphaolefin, kinematic viscosity (40 ° C.) 29-33 mm 2 / s) (2) Thickener: Diurea (reactant of diisocyanate and amine compound) (2-1) Diisocyanate 4,4'-diphenylmethane diisocyanate (4,4'-MDI) (2-2) Amine Compound 1-Amino Octadecane (Octadecylamine) (3) Niglosin NUBIAN BLACK TN-870 (manufactured by Orient Chemical Co., Ltd.)
  • Example 1 (1) Weigh the base oil (PAO6), 4,4'-MDI, 1-aminooctadecane, and niglosin.
  • Nigrosin is weighed so as to be 1% by mass with respect to the total amount of the base oil and diurea.
  • the amine solution in the stainless steel container B is dropped into the stainless steel container A and gradually added to the isocyanate solution. (5) After confirming that the entire amount of the amine solution in the stainless steel container B has been charged into the stainless steel container A, the temperature is raised to 150 ° C. (6) Stir while heating, and keep the temperature at 150 ° C. for 30 minutes.
  • Example 2 A grease composition was prepared in the same manner as in Example 1 except that the blending amount of niglocin was changed to an amount of 3% by mass with respect to the total amount of the base oil and the thickener.
  • Example 3 A grease composition was prepared in the same manner as in Example 1 except that the blending amount of niglocin was changed to an amount of 5% by mass with respect to the total amount of the base oil and the thickener.
  • the oil supply (oil release degree) can be improved with almost no change in the mixing consistency.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Lubricants (AREA)

Abstract

L'invention concerne une composition de graisse ayant une excellente capacité d'alimentation en huile. Cette composition de graisse comprend une huile de base, une diurée représentée par la formule structurale (1) qui est utilisé en tant qu'épaississant et nigrosine, la teneur de l'épaississant étant de 13 à 25 % en masse par rapport à la quantité totale de l'huile de base et de l'épaississant et la teneur en nigrosine étant de 0,5 à 7 % en masse par rapport à la quantité totale de l'huile de base et de l'épaississant.　Formule (1) : R1-NHCONH-R2-NHCONH-R3 [Dans la formule (1), R1 and R3 représentent indépendamment un groupe alkyle à chaîne droite ayant 16 à 22 atomes de carbone et R2 représente un groupe fonctionnel représenté par la formule (2).]
PCT/JP2020/032209 2019-08-30 2020-08-26 Composition de graisse, et procédé pour produire une composition de graisse et palier à roulement WO2021039852A1 (fr)

Applications Claiming Priority (2)

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JP2019158798A JP2021038283A (ja) 2019-08-30 2019-08-30 グリース組成物、グリース組成物の製造方法および転がり軸受
JP2019-158798 2019-08-30

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WO2021039852A1 true WO2021039852A1 (fr) 2021-03-04

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003253283A (ja) * 2002-03-01 2003-09-10 Asahi Kasei Corp 樹脂組成物
JP2005171107A (ja) * 2003-12-12 2005-06-30 Ricoh Co Ltd 電子写真用潤滑剤、潤滑剤塗布装置、プロセスカートリッジ及び画像形成装置
JP2008195800A (ja) * 2007-02-09 2008-08-28 Fujifilm Corp グリース組成物、及び機械要素
JP2008286230A (ja) * 2007-05-15 2008-11-27 Nsk Ltd モータ用転がり軸受
JP2009007440A (ja) * 2007-06-27 2009-01-15 Kyowa Hakko Chemical Co Ltd 油類用添加剤およびこれを含有する潤滑油
JP2013104037A (ja) * 2011-11-16 2013-05-30 Kyodo Yushi Co Ltd 磁気粘性グリース組成物
JP2015101619A (ja) * 2013-11-22 2015-06-04 日本精工株式会社 グリース組成物及び転動装置
JP2016133144A (ja) * 2015-01-16 2016-07-25 Ntn株式会社 モータ用グリース封入軸受

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003253283A (ja) * 2002-03-01 2003-09-10 Asahi Kasei Corp 樹脂組成物
JP2005171107A (ja) * 2003-12-12 2005-06-30 Ricoh Co Ltd 電子写真用潤滑剤、潤滑剤塗布装置、プロセスカートリッジ及び画像形成装置
JP2008195800A (ja) * 2007-02-09 2008-08-28 Fujifilm Corp グリース組成物、及び機械要素
JP2008286230A (ja) * 2007-05-15 2008-11-27 Nsk Ltd モータ用転がり軸受
JP2009007440A (ja) * 2007-06-27 2009-01-15 Kyowa Hakko Chemical Co Ltd 油類用添加剤およびこれを含有する潤滑油
JP2013104037A (ja) * 2011-11-16 2013-05-30 Kyodo Yushi Co Ltd 磁気粘性グリース組成物
JP2015101619A (ja) * 2013-11-22 2015-06-04 日本精工株式会社 グリース組成物及び転動装置
JP2016133144A (ja) * 2015-01-16 2016-07-25 Ntn株式会社 モータ用グリース封入軸受

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