CN107057807B - Grease composition, rolling bearing, and motor - Google Patents

Grease composition, rolling bearing, and motor Download PDF

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Publication number
CN107057807B
CN107057807B CN201610987206.7A CN201610987206A CN107057807B CN 107057807 B CN107057807 B CN 107057807B CN 201610987206 A CN201610987206 A CN 201610987206A CN 107057807 B CN107057807 B CN 107057807B
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salt
grease composition
acid
metal salt
rolling bearing
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CN107057807A (en
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浅井佑介
榎本祐介
高田真太郎
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Minebea Co Ltd
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Minebea Co Ltd
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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
    • 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
    • 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
    • C10M167/00—Lubricating compositions characterised by the additive being a mixture of a macromolecular compound, a non-macromolecular compound and a compound of unknown or incompletely defined constitution, each of these compounds being essential
    • 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
    • F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
    • F16C33/6633—Grease properties or compositions, e.g. rheological properties
    • 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
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H02K5/1735—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at only one end of the rotor
    • 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
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
    • 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/0206—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers used as base material
    • 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
    • C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms used as base material
    • 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/121—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms
    • C10M2207/123—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms polycarboxylic
    • 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C10M2207/127—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids polycarboxylic
    • 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/285—Esters of aromatic polycarboxylic acids
    • C10M2207/2855—Esters of aromatic polycarboxylic acids used as base material
    • 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
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
    • C10M2209/084—Acrylate; Methacrylate
    • 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
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
    • C10M2209/086—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type polycarboxylic, e.g. maleic acid
    • 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
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/10—Amides of carbonic or haloformic acids
    • C10M2215/1013—Amides of carbonic or haloformic acids used as thickening agents
    • 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
    • C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2217/04—Macromolecular compounds from nitrogen-containing monomers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2217/045—Polyureas; Polyurethanes
    • C10M2217/0456—Polyureas; Polyurethanes used as thickening agents
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/02—Groups 1 or 11
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/04—Groups 2 or 12
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/08—Resistance to extreme temperature
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/02—Bearings
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/14—Electric or magnetic purposes
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/10—Semi-solids; greasy
    • 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
    • F16C2380/00—Electrical apparatus
    • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators

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

Abstract

The invention provides a grease composition which is less thermally degraded even when used in a high-temperature environment, a rolling bearing which is excellent in acoustic characteristics even when used in a high-temperature environment, and a motor. The grease composition comprises a base oil, a thickener, and 0.5 wt% or more of a dispersant containing at least one of a metal salt of a carboxylic acid, a metal salt of a polycarboxylic acid, and a copolymer of a metal salt of a carboxylic acid and a hydrocarbon compound. The metal salt of a carboxylic acid, the metal salt of a polycarboxylic acid, and the metal salt of a carboxylic acid forming a copolymer of the metal salt of a carboxylic acid and a hydrocarbon compound may be an alkali metal salt containing at least one of a sodium salt, a lithium salt, and a potassium salt or an alkaline earth metal salt containing at least one of a magnesium salt and a calcium salt.

Description

Grease composition, rolling bearing, and motor
Technical Field
The invention relates to a grease composition, a rolling bearing and a motor.
Background
For a rolling bearing used for a fan motor of a home appliance or a communication device, a grease composition is used for lubrication. The grease composition contains a base oil, a thickener and an additive, and for example, there is a urea grease containing a urea compound as a thickener. Since the urea grease is excellent in heat resistance, a rolling bearing using the urea grease is excellent in acoustic characteristics even when used at high temperatures.
For example, patent document 1 discloses a urea grease which is a grease composition containing a base oil, a thickener and an additive, and which contains at least 1 of a urea compound as the thickener, and a carboxylic acid, a carboxylate and an ester as the additive (rust inhibitor).
Patent document 2 discloses a urea grease composition containing a base oil, a thickener and an additive, which contains an aromatic ester oil having a base oil content of 30 mass% (wt%) or more and 5 to 35 mass% (wt%) of a diurea compound.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2004-224823
Patent document 2: japanese patent laid-open publication No. 2004-339448
Disclosure of Invention
However, the use environment of the fan motor is increased due to an increase in the amount of heat generated by the household electrical appliances and communication equipment, and the use environment of the rolling bearing is increased accordingly. Therefore, the urea grease is required to be inhibited from thermal deterioration even when used in an environment at a higher temperature than before. However, even when the urea grease described in patent documents 1 and 2 is used, the heat resistance is insufficient, and therefore, there is a problem that the urea grease is agglomerated in the high-temperature environment as described above and the acoustic characteristics are deteriorated when used for a rolling bearing, and further improvement is required.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a grease composition which is less thermally deteriorated even when used in a high-temperature environment, and a rolling bearing and a motor which are excellent in acoustic characteristics when used in a high-temperature environment.
In order to solve the above problems and achieve the object, a grease composition according to one embodiment of the present invention is characterized by containing a base oil, a thickener, and 0.5 wt% or more of a dispersant containing at least one of a metal salt of a carboxylic acid, a metal salt of a polycarboxylic acid, and a copolymer of a metal salt of a carboxylic acid and a hydrocarbon compound.
In addition, a grease composition according to an aspect of the present invention is characterized in that at least one of the metal salt of the carboxylic acid and the metal salt of the polycarboxylic acid is an alkali metal salt containing at least one of a sodium salt, a lithium salt, and a potassium salt, or an alkaline earth metal salt containing at least one of a magnesium salt and a calcium salt.
In addition, a grease composition according to an aspect of the present invention is characterized in that the metal carboxylate salt forming the copolymer of the metal carboxylate salt and the hydrocarbon compound is an alkali metal salt containing at least one of a sodium salt, a lithium salt, and a potassium salt, or an alkaline earth metal salt containing at least one of a magnesium salt and a calcium salt.
In addition, a grease composition according to an embodiment of the present invention is characterized in that the content of the dispersant is 10 wt% or less.
In addition, a grease composition according to one embodiment of the present invention is characterized in that the thickener contains a diurea compound represented by the following general formula (1).
R1-NHCONH-R2-NHCONH-R3···(1)
Here, R1、R2、R3Is a hydrocarbon group selected from aliphatic hydrocarbon groups, alicyclic hydrocarbon groups and aromatic hydrocarbon groups.
A grease composition according to one embodiment of the present invention is characterized by containing a base oil, a thickener containing a diurea compound represented by the following general formula (1), and 0.5 to 10% by weight of a dispersant containing at least one of a sodium salt of sebacic acid, a sodium salt of polyacrylic acid, and a copolymer of a sodium salt of maleic acid and isobutylene.
R1-NHCONH-R2-NHCONH-R3···(1)
Here, R1、R2、R3Is a hydrocarbon group selected from aliphatic hydrocarbon groups, alicyclic hydrocarbon groups and aromatic hydrocarbon groups.
A rolling bearing according to an aspect of the present invention is a rolling bearing in which the grease composition is sealed.
A motor according to an aspect of the present invention includes the rolling bearing.
According to the present invention, a grease composition which is less thermally deteriorated even when used in a high-temperature environment, a rolling bearing which is excellent in acoustic characteristics even when used in a high-temperature environment, and a motor can be provided.
Drawings
Fig. 1 is a sectional view of a fan motor including a rolling bearing according to an embodiment of the present invention.
Fig. 2 is a sectional view of a rolling bearing according to an embodiment of the present invention.
FIG. 3 is a graph showing the experimental results of the example of the present invention.
FIG. 4 is a graph showing the experimental results of the example of the present invention.
Detailed Description
Hereinafter, embodiments of the grease composition, the rolling bearing, and the motor according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments. In the drawings, the same or corresponding elements are denoted by the same reference numerals as appropriate, and redundant description thereof is omitted as appropriate.
Fig. 1 is a sectional view of a fan motor 10 including a rolling bearing 20 according to an embodiment of the present invention. Fig. 2 is a sectional view of a rolling bearing 20 according to an embodiment of the present invention.
The fan motor 10 according to the embodiment of the present invention includes a rotor shaft 11, a rolling bearing 20, a stator 12, an impeller 13, and a casing 16. The rotor shaft 11 is rotatably held by a rolling bearing 20. The impeller 13 includes a rotor housing 14 and blades 15 provided on the outer periphery of the rotor housing 14.
The rolling bearing 20 includes an inner ring 21, an outer ring 22, a spherical rolling element 23, a cage 24, and a seal material 25. Further, the grease composition G is sealed inside the sealed portion of the sealing material 25. The rolling bearing 20 according to the embodiment to which the present invention is applied is not limited to the fan motor, and may be applied to other types of motors.
Next, a grease composition G according to an embodiment of the present invention will be described. The grease composition G according to the embodiment of the present invention contains a base oil and a thickener, and further contains at least one of a metal salt of a carboxylic acid, a metal salt of a polycarboxylic acid, and a copolymer of a metal salt of a carboxylic acid and a hydrocarbon compound as a dispersant. As a result of intensive studies on the grease composition, the present inventors have confirmed that when the grease composition is used in a rolling bearing and the rolling bearing is used in a high-temperature environment (for example, 140 ℃ or higher) for a long time, aggregates in the grease composition become coarse, and the acoustic characteristics of the rolling bearing deteriorate. Further, it was found that when the grease composition contains at least one of a metal salt of a carboxylic acid, a metal salt of a polycarboxylic acid, and a copolymer of a metal salt of a carboxylic acid and a hydrocarbon compound as a dispersant, coarsening of aggregates can be suppressed and deterioration of acoustic characteristics can be reduced even when the rolling bearing is used in a high-temperature environment for a long time. The grease composition G according to the embodiment of the present invention has been completed based on this finding.
The type of the base oil is not particularly limited, and generally, synthetic hydrocarbon oil, alkyl ether oil, alkyl diphenyl ether oil, ester oil, mineral oil, fluorine oil, silicone oil, and the like, which are useful as grease base oils, can be used alone or in combination. The content of the base oil may be, for example, 70 to 90 wt%.
Examples of the synthetic hydrocarbon oil include polyalphaolefins such as n-paraffin, isoparaffin, polybutene, polyisobutylene, 1-decene oligomer, and 1-decene ethylene oligomer. Examples of the ester oil include diester oils such as dibutyl sebacate, di-2-ethylhexyl sebacate, dioctyl adipate, diisodecyl adipate, ditridecyl glutarate (ジトリデシルタレート), methyl acetylricinoleate (メチル, アセチルシノレート), aromatic ester oils such as trioctyl trimellitate, tri-2-ethylhexyl trimellitate, tridecyl trimellitate, tetraoctyl pyromellitate, and tetra-2-ethylhexyl pyromellitate, polyol ester oils such as trimethylolpropane octanoate, trimethylolpropane nonanoate, pentaerythritol-2-ethylhexanoate, and pentaerythritol nonanoate, and carbonate oils. Examples of the alkyldiphenyl ether oil include monoalkyldiphenyl ether, dialkyldiphenyl ether, polyalkyldiphenyl ether, and the like. Among the above, aromatic ester oils are preferable, and they may be used alone or in combination. It is particularly preferable to use a base oil obtained by mixing tri-2-ethylhexyl trimellitate with tetra-2-ethylhexyl pyromellitate.
As the thickener, a non-urea compound or a urea compound can be used, but a urea compound is preferably used from the viewpoint of heat resistance and acoustic characteristics. The content of the thickener may be, for example, in the range of 10 to 30 wt%.
Examples of the non-urea compound include metal soaps and polytetrafluoroethylene resins. The metal soap can be synthesized from an aliphatic monocarboxylic acid such as stearic acid, an aliphatic monocarboxylic acid having at least one hydroxyl group such as 12-hydroxystearic acid, and an alkaline earth metal hydroxide. In addition, a complex metal soap synthesized from a dibasic acid such as an aliphatic monocarboxylic acid and an aliphatic dicarboxylic acid may also be used.
As the urea compound, urea compounds such as diurea compounds, triurea compounds, and polyurea compounds can be used. In particular, it is preferable to use a diurea compound from the viewpoint of heat resistance and acoustic characteristics (quietness). The diurea compound can be represented by the following formula (1).
R1-NHCONH-R2-NHCONH-R3···(1)
Here, R1、R2、R3Is a hydrocarbon group selected from aliphatic hydrocarbon groups, alicyclic hydrocarbon groups and aromatic hydrocarbon groups, specifically, R1、R2、R3The hydrocarbon group may be an aliphatic hydrocarbon group, an alicyclic hydrocarbon group, or an aromatic hydrocarbon group, and the number of carbon atoms is not particularly limited. R2Preferred are aromatic hydrocarbon groups, and more preferred are 1 or 2 substituted aromatic hydrocarbon groups of phenyl groups. Amine compounds and isocyanate compounds can be used as raw materials for synthesizing these compounds. As the amine compound, in addition to aliphatic amines typified by hexylamine, octylamine, dodecylamine, hexadecylamine, octadecylamine, stearylamine, oleylamine, and the like, alicyclic amines typified by cyclohexylamine, and the like, aromatic amines typified by aniline, p-toluidine, ethoxyaniline, and the like can be used. As the isocyanate compound, phenylene diisocyanate, toluene diisocyanate, diphenyl diisocyanate, diphenylmethane diisocyanate, octadecane diisocyanateAcid ester, decane diisocyanate, hexamethylene diisocyanate. It is preferable to use an aliphatic aromatic diurea compound synthesized from an aromatic isocyanate and an aliphatic amine and an aromatic amine as the amine raw material.
The carboxylic acid used as the metal salt of the carboxylic acid contained as the dispersant is not limited, but is preferably an aliphatic carboxylic acid, and may be an aliphatic saturated carboxylic acid or an aliphatic unsaturated carboxylic acid. The polycarboxylic acid used for the metal salt of the polycarboxylic acid is not limited, and the carboxylic acid constituting the polycarboxylic acid is preferably an aliphatic carboxylic acid, and may be an aliphatic saturated carboxylic acid or an aliphatic unsaturated carboxylic acid. As the carboxylic acid constituting the polycarboxylic acid, an aliphatic unsaturated carboxylic acid is more preferably used. Examples of the unsaturated carboxylic acid include acrylic acid, crotonic acid, isocrotonic acid, 3-butenoic acid, methacrylic acid, angelic acid, tiglic acid, 4-pentenoic acid, 2-ethyl-2-butenoic acid, 10-undecenoic acid, oleic acid, and examples of the saturated dicarboxylic acid include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, and sebacic acid. Examples of the saturated carboxylic acid include formic acid, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid, lauric acid, myristic acid, palmitic acid, margaric acid and stearic acid, and examples of the unsaturated dicarboxylic acid include fumaric acid, maleic acid and itaconic acid. The polycarboxylic acid composed of these carboxylic acids may be a polymer of monocarboxylic acid or a polymer of dicarboxylic acid. Polymers of unsaturated carboxylic acids containing 1 or 2 carboxyl groups are particularly preferred. The metal salt of the carboxylic acid may form a copolymer with a hydrocarbon compound. That is, the grease composition may contain a copolymer of a metal carboxylate and a hydrocarbon compound as a dispersant. The grease composition may have a structure including at least one of a metal carboxylate, a metal salt of a polycarboxylic acid, and a copolymer of a metal carboxylate and a hydrocarbon compound. Specific examples of the metal carboxylate salt and the metal salt of a polycarboxylic acid or the metal carboxylate salt forming a copolymer of the metal carboxylate salt and a hydrocarbon compound include at least one selected from the group consisting of alkali metal salts and alkaline earth metal salts. The alkali metal salt is preferably a sodium salt, a lithium salt, a potassium salt, or the like, and the alkaline earth metal salt is preferably a magnesium salt, a calcium salt, or the like. In the copolymer of the metal carboxylate and the hydrocarbon compound, examples of the hydrocarbon compound to be polymerized (polymerized) with the metal carboxylate include isobutylene, propylene, isoprene, butadiene and the like.
The weight average molecular weight of the polycarboxylic acid is preferably 5000 to 200000, more preferably 7000 to 80000, and still more preferably 9000 to 16000 in terms of polyethylene glycol-equivalent weight average molecular weight (Mw) obtained by Gel Permeation Chromatography (GPC).
In the grease composition G according to the embodiment of the present invention, the metal salt of carboxylic acid or the metal salt of polycarboxylic acid as the dispersant is preferably contained in an amount of 0.5 wt% or more. When the content of the metal carboxylate or the metal salt of a polycarboxylic acid is 0.5 wt% or more, the heat resistance can be sufficiently improved, the thermal deterioration can be reduced, and the acoustic characteristics can be improved. When the dispersant is a copolymer of a metal carboxylate and a hydrocarbon compound, it is preferably contained in an amount of 0.5 wt% or more. In the grease composition G according to the embodiment of the present invention, the content of the dispersant is preferably 10 wt% or less.
The grease composition G may contain, as other additives, an antioxidant, an anti-friction agent, a metal deactivator, an antirust agent, an oiliness agent, a viscosity index improver, and the like, as required.
In the grease composition, the rolling bearing, and the motor according to the present embodiment configured as described above, since the grease composition contains the dispersant, the grease composition has high heat resistance, and is less thermally degraded even when used in a high-temperature environment, and the rolling bearing has good acoustic characteristics. Here, since the grease composition contains the dispersant, coarsening of aggregates can be suppressed even when used in a high-temperature environment for a long time, and thus, when used in a rolling bearing, the acoustic characteristics become good even when used at a high temperature.
An embodiment in which the above-described respective components are combined as appropriate is also included in the present invention. Further, those skilled in the art can easily derive further modifications. Thus, the present invention in its broader aspects is not limited to the above embodiments, and various modifications may be made.
For example, in the above embodiment, the grease composition may contain a sodium salt of a carboxylic acid or a polycarboxylic acid as a dispersant. Further, the dispersant may be a metal salt of a polycarboxylic acid other than a carboxylic acid or a sodium salt of a polycarboxylic acid. Examples of the metal salt of a carboxylic acid or a polycarboxylic acid include, in addition to a sodium salt, a lithium salt, a potassium salt, a magnesium salt, and a calcium salt. In this case, at least 1 kind of metal salt of carboxylic acid or polycarboxylic acid may be contained. The grease composition containing a metal salt of a carboxylic acid or a polycarboxylic acid exerts the same effects as those of the grease composition G described in the above embodiment. Further, the copolymer of the metal carboxylate and the hydrocarbon compound may be a copolymer using a sodium salt or a metal salt other than a sodium salt. When the grease composition contains 2 or more of a metal carboxylate, a metal salt of a polycarboxylic acid, and a copolymer of a metal carboxylate and a hydrocarbon compound as a dispersant, the total content is preferably 0.5 wt% or more.
(examples and comparative examples)
Next, examples of the present invention and comparative examples will be explained. In the examples and comparative examples, various grease compositions were prepared, and their characteristics were compared and examined.
The grease compositions of examples 1 to 20 and comparative examples 1 to 9 were prepared by mixing the base oil, the thickener and the dispersant according to the components shown in tables 1 and 2. As the base oil, ester oil (TOTM (trioctyl trimellitate) + TOPM (tetraoctyl pyromellitate)), PAO (poly- α -olefin), mineral oil were used. As the thickener, a mixture obtained by mixing an aromatic urea compound and an aliphatic urea compound as a diurea compound a (diurea a in tables 1 and 2) and a mixture obtained by mixing an aliphatic urea compound and an alicyclic urea compound as a diurea compound B (diurea B in tables 1 and 2) were used. As the dispersant, a sodium salt of polyacrylic acid (a in tables 1 and 2) as a metal salt of a polycarboxylic acid, a copolymer of sodium salt of maleic acid and isobutylene (B in tables 1 and 2) as a copolymer of a metal salt of a carboxylic acid and a hydrocarbon compound, and a sodium salt of sebacic acid (C in tables 1 and 2) as a metal salt of a carboxylic acid were used. In tables 1 and 2, the numbers expressed as percentages indicate the content of the dispersant by mass%. That is, the grease compositions of examples 1 to 20 contained the dispersant A, B or C in the range of 0.5 wt% to 10.0 wt%. The grease compositions of comparative examples 1 to 3 did not contain a dispersant. The grease compositions of comparative examples 4, 5 and 8 each contained 0.1 wt% of dispersant A, B, C. The grease compositions of comparative examples 6 and 7 contained 2.0 wt% of each of an ammonium polyacrylate salt (D in table 2) and an amine polyacrylate salt (E in table 2) which are metal salts other than the polycarboxylic acid salt. The grease composition of comparative example 9 contained 2.0 wt% of ammonium sebacate (F in table 2) which is a carboxylate but is other than a metal salt. After the respective grease compositions thus prepared were subjected to a heating and standing test described later, the sizes of the aggregates were evaluated.
[ Table 1]
Figure BDA0001148867010000091
[ Table 2]
TABLE 2 (comparative example)
Figure BDA0001148867010000101
The size of the aggregate was evaluated by performing a heating and standing test in which each grease composition was allowed to stand at 160 ℃ for 500 hours, and then observing the size of the aggregate with an optical microscope. At this time, the maximum diameter of the aggregate was measured in a 1-point visual field of a 300 μm square area observed at a magnification of 200 times. The results of the above experiment are shown in tables 1 and 2.
As shown in the evaluation results of the heat resistance in tables 1 and 2, in examples 1 to 20, the maximum diameter of the aggregate was less than 100 μm even when the material was left standing for a long time in a high temperature environment of 160 ℃. On the other hand, in comparative examples 1 to 9, the aggregate in the grease composition was coarsened to 100 μm or more.
Further, the grease compositions of examples 3, 9 and 16 and comparative examples 1 and 4 were subjected to viscosity measurement as evaluation of heat resistance. Specifically, the grease compositions of examples 3, 9 and 16 and comparative examples 1 and 4 were subjected to a heating and standing test at temperatures of 120 ℃, 140 ℃ and 160 ℃ for 500 hours, respectively, and then the viscosity of each grease composition was measured. The viscosity was measured by using a rheometer under conditions of a temperature of 25 ℃, a shear rate of 1/s, and a pitch of 0.2 mm. The experimental results are shown in fig. 3. In fig. 3, the horizontal axis represents the standing temperature, and the vertical axis represents the viscosity. From the results of fig. 3, it is understood that the difference in viscosity between the examples and the comparative examples is not very large in the results of the heating and standing test at 120 ℃, but the grease compositions of examples 3, 9, and 16 have significantly lower viscosity than the grease compositions of comparative examples 1 and 4 after the heating and standing test in a high temperature environment such as 140 ℃ or 160 ℃. That is, it was confirmed that the grease compositions of examples 3, 9 and 16 were less thermally deteriorated even in a high-temperature environment exceeding 120 ℃, and the properties of the grease were maintained.
Further, as a heat resistance test, the grease compositions of examples 3, 9 and 16 and comparative examples 1 and 4 were subjected to the following heat rotation test: each grease composition was sealed in a rolling bearing, and the rolling bearing was rotated at a rotational speed of 3000rpm for 500 hours at test temperatures of 120 ℃, 140 ℃ and 160 ℃ respectively, and then the acoustic characteristics of the rolling bearing were examined.
Specifically, a test grease was sealed in a ball bearing with a steel boot (inner diameter 8mm, outer diameter 22mm, width 7mm) at 25% to 35% of the bearing volume. Then, the ball bearing was mounted in a housing, a shaft was inserted into the inner diameter of the bearing, the shaft was coupled to a rotating shaft of a test motor, and the ball bearing was rotated under each test temperature condition so as to rotate the inner ring, thereby performing a heat rotation test.
The acoustic properties after the heat rotation test were evaluated by measuring the Anderon value of the M band (300 to 1800Hz) using an anderson apparatus (manufactured by syuchi institute of voltage & tube) for the ball bearings rotated at each test temperature. The M-band frequency of 300 to 1800Hz is a harsh sound for humans. The results of this experiment are shown in fig. 4. In fig. 4, the horizontal axis represents the test temperature, and the vertical axis represents the Anderon value. As shown in fig. 4, it was confirmed that the grease compositions of examples 3, 9 and 16 also exhibited significantly lower Anderon values after the heat rotation test in a high temperature environment such as 140 ℃ and 160 ℃ than the grease compositions of comparative examples 1 and 4, and the acoustic characteristics (quietness) were good. For example, the Anderon values of examples 3, 9, and 16 after the 160 ℃ heat spinning test were all about 5, and were 1/2 or less or 1/3 or less of the Anderon values of comparative examples 1 and 4 (about 17 and about 13, respectively).
As shown in Table 2, the grease compositions of comparative examples 1 and 4 had the maximum diameters of the aggregates of 250 μm and 130 μm, respectively, and the sizes of the aggregates exceeded 100 μm, when subjected to the heat-standing test. The Anderon value of the grease compositions of comparative examples 1 and 4 after the heat rotation test at 160 ℃ was a value exceeding 10, and a harsh sound was felt. Therefore, as the grease composition, a grease composition containing a dispersant is preferred in which the maximum diameter of aggregates generated after the grease composition is subjected to a heating and standing test in which the grease composition is allowed to stand at 160 ℃ for 500 hours or less is 100 μm or less.
As is clear from the above examples and comparative examples, the dispersant of the present invention is contained in the grease composition for the purpose of suppressing coarsening of aggregates caused by thermal deterioration of the thickener such as a urea compound.
Description of the symbols
G grease composition
10 Motor (Fan motor)
11 rotor shaft
12 stator
13 impeller
14 rotor housing
15 blade
16 outer casing
20 rolling bearing
21 inner wheel
22 outer wheel
23 rotating body
24 holder
25 sealing Material

Claims (8)

1. A grease composition characterized by containing a base oil, a thickener and 0.5% by weight or more of a dispersant, wherein the base oil is ester oil, poly-alpha-olefin and mineral oil used singly or in combination,
the thickener contains an aromatic urea compound and an aliphatic urea compound, or an aliphatic urea compound and an alicyclic urea compound,
the dispersant contains a copolymer of a metal carboxylate salt and a hydrocarbon compound, and the metal carboxylate salt forming the copolymer of the metal carboxylate salt and the hydrocarbon compound is an alkali metal salt containing at least one of a sodium salt, a lithium salt, and a potassium salt, or an alkaline earth metal salt containing at least one of a magnesium salt and a calcium salt.
2. A grease composition according to claim 1, characterized in that the content of the dispersant is 10 wt% or less.
3. A grease composition characterized by containing a base oil, a thickener and 0.5 to 10% by weight of a dispersant, the base oil being ester oil, poly-alpha-olefin and mineral oil used alone or in combination, the thickener comprising an aromatic urea compound and an aliphatic urea compound, or an aliphatic urea compound and an alicyclic urea compound,
the dispersant contains a copolymer of sodium maleate and isobutylene.
4. A grease composition according to any one of claims 1 to 3, characterized in that the base oil is a mixed oil of trioctyl trimellitate and tetraoctyl pyromellitate, and the thickener is a thickener containing an aromatic urea compound and an aliphatic urea compound.
5. A rolling bearing in which the grease composition according to any one of claims 1 to 3 is sealed.
6. A rolling bearing in which the grease composition according to claim 4 is sealed.
7. A motor comprising the rolling bearing according to claim 5.
8. A motor comprising the rolling bearing according to claim 6.
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