WO2021070887A1 - Composition de graisse et palier à billes de roulement - Google Patents

Composition de graisse et palier à billes de roulement Download PDF

Info

Publication number
WO2021070887A1
WO2021070887A1 PCT/JP2020/038084 JP2020038084W WO2021070887A1 WO 2021070887 A1 WO2021070887 A1 WO 2021070887A1 JP 2020038084 W JP2020038084 W JP 2020038084W WO 2021070887 A1 WO2021070887 A1 WO 2021070887A1
Authority
WO
WIPO (PCT)
Prior art keywords
grease composition
oil
grease
ball bearing
rolling ball
Prior art date
Application number
PCT/JP2020/038084
Other languages
English (en)
Japanese (ja)
Inventor
川村　隆之
涼太 近藤
Original Assignee
Ntn株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Publication of WO2021070887A1 publication Critical patent/WO2021070887A1/fr

Links

Images

Classifications

    • 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
    • C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
    • C10M101/02—Petroleum fractions
    • 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
    • C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
    • 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
    • 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 and a rolling ball bearing in which the grease composition is sealed.
  • a grease composition for lubrication is sealed inside the rolling ball bearing for the purpose of reducing rolling friction and sliding friction.
  • Rolling ball bearings filled with a grease composition have a long life, do not require an external lubrication unit, and are inexpensive, so they are often used for general-purpose applications such as automobiles and industrial equipment.
  • Bearing torque (also called rotational torque) in rolling ball bearings is an important characteristic of products, and low torque is required from the viewpoint of energy saving and resource saving.
  • the rotational torque of rolling ball bearings is related to the behavior of grease such as channeling and churning.
  • channeling the grease is squeezed out during rotation, the amount of grease adhering to the rolling element surface and the raceway surface is reduced, and the torque tends to be low.
  • churning the grease that has been scraped off by rotation returns to the raceway surface, so that the amount of grease adhering to the rolling element surface or the raceway surface always increases, and the torque tends to be high. Therefore, it is desired to develop a grease that is in a channeling state as the behavior of the grease.
  • Patent Document 1 contains a base oil and a thickener, the thickener is lithium 12-hydroxystearate, and the mass ratio of the thickener to the total mass of the grease composition is 15% or less.
  • a grease composition having a yield stress of 2 kPa or more is disclosed. In Patent Document 1, the yield stress is increased to improve the channeling property and reduce the torque.
  • the present invention has been made in view of such circumstances, and provides a grease composition having low torque and excellent bearing life even under light load conditions and low-speed rotation conditions, and a rolling ball bearing containing the same.
  • the purpose is to do.
  • the grease composition of the present invention is a grease composition sealed in a rolling ball bearing used in a rotation speed range of 2000 min -1 or less and an axial load and a radial load of 5 kgf or less. Is characterized by containing a base oil, a thickener and an additive, and having a yield stress of 3000 Pa or more at 25 ° C. measured by a dynamic viscoelasticity measuring method using a rheometer.
  • the base oil is a mixed oil of a mineral oil and a synthetic hydrocarbon oil, and is characterized by containing 50% by mass or more of the synthetic hydrocarbon oil with respect to the entire base oil.
  • the base oil has a kinematic viscosity at 40 ° C. of 50 to 80 mm 2 / s, and the kinematic viscosity of the mineral oil at 40 ° C. is higher than the kinematic viscosity of the synthetic hydrocarbon oil at 40 ° C.
  • the thickener is a diurea compound obtained by reacting a diisocyanate component with a monoamine component, and the thickener is characterized in that the monoamine component is an aliphatic monoamine or an alicyclic monoamine.
  • the above additive is characterized by containing a calcium-based additive.
  • the rolling ball bearing of the present invention includes a rolling ball bearing including an inner ring and an outer ring, a ball interposed between the inner ring and the outer ring, a cage for holding the ball, and a grease composition sealed around the ball.
  • the grease composition is the grease composition of the present invention.
  • the grease composition of the present invention is sealed in a rolling ball bearing used in a rotation speed range of 5 kgf or less and 2000 min -1 or less in axial load and radial load, and contains a base oil, a thickener and an additive. Including, since the yield stress is 3000 Pa or more, the channeling property of the grease is enhanced even under a light load condition and a low speed rotation condition, so that the rotation torque can be reduced and the bearing life is also excellent.
  • the base oil is a mixed oil of a mineral oil and a synthetic hydrocarbon oil, contains 50% by mass or more of the synthetic hydrocarbon oil with respect to the entire base oil, and has a kinematic viscosity at 40 ° C. of 50 mm 2 / s to 80 mm 2. Since it is / s, a relatively high viscosity can contribute to prolonging the life of the oil.
  • FIG. 1 It is sectional drawing which shows an example of the rolling ball bearing of this invention. It is a partial perspective view of the cage in FIG. It is a figure which shows the state of the grease in a cage pocket.
  • FIG. 1 is a partial cross-sectional view of a deep groove ball bearing incorporating a crown bearing as the rolling ball bearing of the present invention
  • FIG. 2 is a partial perspective view of the crown cage.
  • an inner ring 2 having a raceway surface 2a on the outer peripheral surface and an outer ring 3 having a raceway surface 3a on the inner peripheral surface are arranged concentrically.
  • a plurality of balls 4 are arranged between the raceway surface 2a of the inner ring and the raceway surface 3a of the outer ring. The plurality of balls 4 are held by the crown-shaped cage 5.
  • the deep groove ball bearing 1 includes an annular seal member 6 provided at both ends in the axial direction of the inner and outer rings, and is a bearing inner space composed of an inner ring 2, an outer ring 3, a cage 5, and a seal member 6. It is lubricated by the grease composition 7 sealed in.
  • This grease composition 7 corresponds to the grease composition of the present invention.
  • the crown-shaped cage 5 forms a pair of opposing holding claws 8 on the upper surface of the annular main body 5a at a constant pitch in the circumferential direction, and the opposing holding claws 8 approach each other.
  • a pocket 9 for holding a ball, which is a rolling element, is formed between the holding claws 8 while bending in the direction of bending.
  • a flat portion 10 serving as a rising reference surface for the holding claws 8 is formed between the back surfaces of the holding claws 8 that are adjacent to each other and are formed on the edges of the adjacent pockets 9.
  • the grease composition of the present invention contains a base oil, a thickener and an additive, and is characterized in that the yield stress at 25 ° C. measured by a dynamic viscoelasticity measurement method using a rheometer is 3000 Pa or more. There is.
  • the yield stress of the grease composition is measured by a dynamic viscoelasticity measuring method based on JIS K7244 using a rheometer. Specifically, the swing angle is changed with a rheometer under predetermined conditions, and the storage elastic modulus G'representing the elastic component of the grease and the loss elastic modulus G'representing the viscous component are measured and their ratios (tan ⁇ ).
  • the storage elastic modulus G' corresponds to the energy that can be elastically stored in the external force received by the grease composition, and the loss elastic modulus G ′′ corresponds to the heat in the external force received by the grease composition. Corresponds to the energy dissipated as.
  • the conditions for dynamic viscoelasticity measurement are preferably a frequency of 1 Hz and a temperature of 25 ° C.
  • the rheometer it is preferable to use a rheometer having a parallel plate type cell. Since this rheometer has a feature that a constant stress can be applied, it is suitable for measuring the yield stress of a grease composition.
  • FIG. 3 shows a photograph of the grease adhering state inside the bearing taken by an X-ray CT scanner using a model bearing.
  • resin is used for the inner and outer rings, balls, cages, and seals so that X-rays can be transmitted. Further, 5% by mass of tungsten was added to the grease as a tracer so that the contrast between the grease and the member could be easily obtained.
  • the bearing was operated while measuring torque, and a churn product (torque 13 Nmm) stopped at the initial stage (5 hours) and a channeling product (torque 5 N mm) stopped at a long time (23 hours) were observed. As shown in FIG.
  • the grease composition of the present invention has a yield stress of 3000 Pa or more at 25 ° C.
  • the grease composition is squeezed out during rotation even under light load conditions and low rotation speed conditions, and the grease composition is once repelled from the raceway surface. Is positioned and is less likely to be introduced into the raceway surface.
  • the grease composition moves from the raceway surface to the inner ring inner surface surface by centrifugal force and is deposited there as a mass.
  • the amount of grease adhering to the ball surface or the raceway surface is reduced, resulting in a channeling state, and the rotational torque is reduced.
  • the deposited grease composition or its separated oil is returned to the raceway surface to lubricate the bearing.
  • the yield stress of the grease composition is preferably 3500 Pa or more.
  • the higher the yield stress the more likely it is that the grease composition, which is driven by vibration or temperature rise, is prevented from moving to the raceway surface, and a stable channeling state can be maintained.
  • the upper limit of the yield stress is, for example, 5000 Pa. When the yield stress becomes high, it becomes difficult to supply the lubricating component, and the bearing life may be shortened.
  • the yield stress of the grease composition is preferably 3500 Pa to 4500 Pa.
  • the grease composition of the present invention contains a base oil, a thickener and an additive, and is not particularly limited as long as the above-mentioned yield stress is within a predetermined range.
  • a base oil general ones usually used in the field of grease can be used.
  • the base oil for example, highly refined oil, mineral oil, ester oil, ether oil, synthetic hydrocarbon oil (PAO oil), silicone oil, fluorine oil and a mixed oil thereof can be used.
  • paraffin-based mineral oil either paraffin-based mineral oil or naphthenic mineral oil can be used, but it is preferable to use paraffin-based mineral oil because the change in viscosity at high temperature is small.
  • PAO oils are ⁇ -olefins or mixtures of isomerized ⁇ -olefin oligomers or polymers.
  • ⁇ -olefin examples include 1-octene, 1-nonene, 1-decene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1 -Nonadecene, 1-eicosene, 1-dodecene, 1-tetradocene, etc. are mentioned, and a mixture thereof is usually used.
  • the base oil is preferably a mixed oil of mineral oil and PAO oil.
  • the mixing ratio is not particularly limited, but it is more preferable that PAO oil is contained in an amount of 50% by mass or more with respect to the entire base oil (mixed oil).
  • the base oil is more preferably a mixed oil containing 50% by mass to 70% by mass of PAO oil and 30% by mass to 50% by mass of mineral oil.
  • the mineral oil and PAO oil may be a mixed oil of two or more oils (mixed mineral oil or mixed PAO oil), respectively.
  • the kinematic viscosity of the mineral oil at 40 ° C. is higher than the kinematic viscosity of the PAO oil at 40 ° C.
  • the mixed oil preferably comprises a low viscosity PAO oil and a high viscosity mineral oil.
  • the kinematic viscosity of the PAO oil at 40 ° C. is 20 mm 2 / s to 50 mm 2 / s, and the kinematic viscosity of the mineral oil at 40 ° C.
  • the kinematic viscosity of the mixed mineral oil is 80 mm 2 / s to 120 mm 2 / s.
  • the combination of low-viscosity PAO oil and high-viscosity mineral oil can significantly increase the yield stress value as compared with the combination of low-viscosity mineral oil and high-viscosity PAO oil.
  • Lower torque can be achieved under light load conditions and low speed rotation conditions.
  • the kinematic viscosity of the entire base oil is, for example, 50 mm 2 / s to 100 mm 2 / s at 40 ° C. It is preferably 50 mm 2 / s to 80 mm 2 / s, and more preferably 60 mm 2 / s to 80 mm 2 / s.
  • the kinematic viscosity of the base oil is preferably low from the viewpoint of reducing torque, but it may shorten the bearing life.
  • the grease composition of the present invention can maintain the kinematic viscosity of the base oil at a relatively high viscosity (50 mm 2 / s or more) by setting the yield stress within a predetermined range, so that both low torque and long life can be achieved. It is easier to plan.
  • the thickener of the grease composition of the present invention is not particularly limited, and general ones usually used in the field of grease can be used.
  • soap-based thickeners such as metal soaps and composite metal soaps
  • non-soap-based thickeners such as Benton, silica gel, urea compounds, and urea-urethane compounds
  • the metal soap include sodium soap, calcium soap, aluminum soap, lithium soap and the like
  • the urea compound and the urea / urethane compound include a diurea compound, a triurea compound, a tetraurea compound, another polyurea compound and a diurethane compound.
  • a diurea compound having excellent high temperature durability is preferable.
  • the diurea compound is obtained by reacting a diisocyanate component with a monoamine component.
  • aliphatic / alicyclic diurea compounds are particularly preferable.
  • the aliphatic / alicyclic diurea compound can be obtained by using an aliphatic monoamine and an alicyclic monoamine as monoamine components.
  • the blending ratio (for example, mol%) of the aliphatic monoamine and the alicyclic monoamine is not particularly limited, but the alicyclic monoamine is preferably more than the aliphatic monoamine. Specifically, it is preferable that the alicyclic monoamine is 60 mol% or more with respect to the entire monoamine.
  • Examples of the diisocyanate component constituting the diurea compound include phenylenediocyanate, tolylene diisocyanate, diphenyl diisocyanate, diphenylmethane diisocyanate (MDI), octadecane diisocyanate, decane diisocyanate, and hexane diisocyanate.
  • Examples of the aliphatic monoamine include hexylamine, octylamine, dodecylamine, hexadecylamine, octadecylamine, stearylamine, and oleylamine.
  • Examples of the alicyclic monoamine include cyclohexylamine.
  • an alicyclic diurea compound using an alicyclic monoamine an aliphatic diurea compound using an aliphatic monoamine, and an aromatic diurea compound using an aromatic monoamine (p-toluidine, etc.) can also be used. ..
  • Base grease can be obtained by blending a thickener with the base oil.
  • a base grease containing a diurea compound as a thickener is prepared by reacting a diisocyanate component and a monoamine component in a base oil.
  • the blending ratio of the thickener in the entire grease composition is, for example, 5% by mass to 40% by mass, preferably 10% by mass to 30% by mass, and more preferably 10% by mass to 20% by mass. If the content of the thickener is less than 5% by mass, the thickening effect is reduced and grease formation becomes difficult. Further, if it exceeds 40% by mass, the obtained base grease becomes too hard, and it becomes difficult to obtain the desired effect.
  • Examples of the additive used in the present invention include extreme pressure agents such as organic zinc compounds and organic molybdenum compounds, antioxidants such as amine-based, phenol-based and sulfur-based compounds, and anti-wear agents such as sulfur-based and phosphorus-based compounds. , Anti-rust agents such as polyhydric alcohol esters, friction reducing agents such as molybdenum disulfide and graphite, and oily agents such as esters and alcohols.
  • the additive contains a calcium-based additive.
  • the calcium-based additive include hyperbasic Ca sulfonate and neutral Ca sulfonate.
  • the calcium-based additive is preferably contained in an amount of 0.05% by mass to 0.3% by mass, more preferably 0.05% by mass to 0.2% by mass, based on the total amount of Ca in the grease composition.
  • a calcium-based additive and an additive containing sulfur, phosphorus, and zinc in the molecular structure can be used in combination.
  • the barium-based additive for example, hyperbasic Ba sulfonate, etc.
  • the barium-based additive is not contained in the grease composition.
  • the mixing consistency (JIS K 2220) of the grease composition is preferably in the range of 200 to 350. If the consistency is less than 200, oil separation may be small and lubrication may be poor. On the other hand, when the consistency exceeds 350, the grease is soft and easily flows out of the bearing, which is not preferable.
  • the rolling ball bearing of the present invention is a bearing used under light load conditions and low-speed rotation conditions. Specifically, it is used in a rotation speed range in which an axial load and a radial load are 5 kgf or less and 2000 min -1 or less. Will be done.
  • the bearing is more preferably used in a rotational speed range where the axial and radial loads are 3 kgf or less and 1600 min -1 or less. Examples of rolling ball bearings used under such conditions include general-purpose motor bearings for industrial use. Further, as shown in Examples described later, the rolling ball bearing of the present invention exhibits low torque under light load conditions and low rotation conditions, and is also excellent in high temperature durability. Suitable for rolling ball bearings used under conditions.
  • the deep groove ball bearing is shown in FIG. 1 above, but the form of the rolling ball bearing is not limited to this. For example, it may be applied to angular contact ball bearings and hub bearings of automobiles that use balls as rolling elements.
  • the rolling ball bearing of the present invention has an extremely wide range of industrial applications and can be used in various devices and the like.
  • Example 1 For Example 1 and Comparative Examples 1 to 7, a grease composition was obtained by mixing a base oil and a thickener with the compounding composition (mass%) shown in Table 1. The yield stress was calculated using each of the obtained grease compositions.
  • the synthetic hydrocarbon oil used in Comparative Example 7 is a mixture of PAO oil having a kinematic viscosity of 46 mm -1 / s at 40 ° C. and PAO oil having a kinematic viscosity of 155 mm -1 / s at 40 ° C. at a weight ratio of 35:65.
  • the mixed PAO oil was prepared, and the kinematic viscosity of this mixed PAO oil at 40 ° C. was 116.9 mm -1 / s.
  • the grease composition (Example 1) having a yield stress of 3000 Pa or more at 25 ° C. exhibits low torque under light load conditions and low-speed rotation conditions, and has a long life even under high temperature conditions. Indicated.
  • a mixed oil of low-viscosity PAO oil and high-viscosity mineral oil (mass ratio 50:50) was used as the base oil (Example 1), only PAO oil was used (Comparative Example 5).
  • the mixed oil with excess mineral oil (Comparative Example 6) the rotational torque was about 1/2 that of the mixed oil of low-viscosity mineral oil and high-viscosity PAO oil (Comparative Example 7).
  • the bearing torque usually tends to decrease as the kinematic viscosity of the base oil decreases.
  • the kinematic viscosity of the base oil tends to be relatively high, and the bearing torque tends to be high.
  • the bearing torque of the first embodiment is low.
  • the grease composition used under the low speed rotation condition can maintain a low torque even with a relatively high viscosity by increasing the yield stress, and can prevent the consumption of the base oil due to the high channeling characteristics. The life of grease can be extended.
  • the grease composition of the present invention has low torque and excellent bearing life even under light load conditions and low-speed rotation conditions, it has an extremely wide range of industrial applications and can be used in various devices and the like.

Landscapes

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

Abstract

L'invention concerne : une composition de graisse ayant un faible couple et fournissant une excellente durée de vie même dans des conditions de charge légère ou des conditions de rotation à faible vitesse ; et un palier à billes de roulement enfermant la composition de graisse. La composition de graisse 7 est une composition de graisse qui : est enfermée dans un palier à billes de roulement utilisé dans une plage de vitesse de rotation de 2000 min-1 ou moins et ayant une charge axiale et une charge radiale de 5 kgf ou moins ; contenant une huile de base, un épaississant et des additifs ; et ayant une limite d'élasticité d'au moins 3000 Pa à 25 °C telle que mesurée par un procédé de mesure de viscoélasticité dynamique à l'aide d'un rhéomètre.
PCT/JP2020/038084 2019-10-10 2020-10-08 Composition de graisse et palier à billes de roulement WO2021070887A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-187021 2019-10-10
JP2019187021A JP2021063155A (ja) 2019-10-10 2019-10-10 グリース組成物および転がり玉軸受

Publications (1)

Publication Number Publication Date
WO2021070887A1 true WO2021070887A1 (fr) 2021-04-15

Family

ID=75437243

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/038084 WO2021070887A1 (fr) 2019-10-10 2020-10-08 Composition de graisse et palier à billes de roulement

Country Status (2)

Country Link
JP (1) JP2021063155A (fr)
WO (1) WO2021070887A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013023644A (ja) * 2011-07-25 2013-02-04 Nsk Ltd グリース組成物
WO2014088006A1 (fr) * 2012-12-04 2014-06-12 日本精工株式会社 Dispositif de laminage
JP2017172714A (ja) * 2016-03-24 2017-09-28 日本精工株式会社 転がり軸受

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013023644A (ja) * 2011-07-25 2013-02-04 Nsk Ltd グリース組成物
WO2014088006A1 (fr) * 2012-12-04 2014-06-12 日本精工株式会社 Dispositif de laminage
JP2017172714A (ja) * 2016-03-24 2017-09-28 日本精工株式会社 転がり軸受

Also Published As

Publication number Publication date
JP2021063155A (ja) 2021-04-22

Similar Documents

Publication Publication Date Title
US7932219B2 (en) Grease composition and method for production thereof, and rolling bearing having the grease composition sealed therein
US9139793B2 (en) Grease composition, grease-packed bearing, universal joint and linear motion device
JP2004238630A (ja) グリース組成物および転がり軸受
JP6691679B2 (ja) グリース組成物および当該グリース組成物が封入された転がり軸受
JP6722379B2 (ja) グリース組成物およびその製造方法、ならびに当該グリース組成物が封入された転がり軸受
WO2021070888A1 (fr) Palier pour essieux, composition de graisse et palier à billes de roulement
WO2021070887A1 (fr) Composition de graisse et palier à billes de roulement
JP7419012B2 (ja) 車軸用軸受
JP4829538B2 (ja) ハブベアリング
JP6699332B2 (ja) 転動装置
JP2005255977A (ja) グリース組成物および転がり軸受
JP7350608B2 (ja) グリース組成物および転がり玉軸受
JP7166068B2 (ja) グリース封入転がり軸受
JP4262630B2 (ja) 鉄道車両用軸受
JP2017200981A (ja) グリース組成物および転がり軸受
WO2018180826A1 (fr) Composition de graisse lubrifiante, palier à roulement et roulement de moyeu
WO2019049963A1 (fr) Composition de graisse et roulement à rouleaux rempli de graisse
JP2017025189A (ja) グリース組成物、グリース封入軸受、自在継手および直動装置
JP5119068B2 (ja) トランスミッション用軸受
JP7303659B2 (ja) 円すいころ軸受
JP2009019129A (ja) 自在継手用グリースおよび自在継手
JP2009019128A (ja) グリース組成物およびグリース封入転がり軸受
WO2019082870A1 (fr) Roulement graissé étanche
JP2019078312A (ja) グリース封入ころ軸受
JP2019078313A (ja) グリース封入ころ軸受

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20873420

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20873420

Country of ref document: EP

Kind code of ref document: A1