WO2007145305A1 - 潤滑剤の劣化防止方法、潤滑剤、及び動圧軸受装置 - Google Patents
潤滑剤の劣化防止方法、潤滑剤、及び動圧軸受装置 Download PDFInfo
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- WO2007145305A1 WO2007145305A1 PCT/JP2007/062074 JP2007062074W WO2007145305A1 WO 2007145305 A1 WO2007145305 A1 WO 2007145305A1 JP 2007062074 W JP2007062074 W JP 2007062074W WO 2007145305 A1 WO2007145305 A1 WO 2007145305A1
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- lubricant
- acid
- ester
- salt
- lubricating oil
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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
- C10M177/00—Special methods of preparation of lubricating compositions; Chemical modification by after-treatment of components or of the whole of a lubricating composition, not covered by other classes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/10—Construction relative to lubrication
- F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
- F16C33/109—Lubricant compositions or properties, e.g. viscosity
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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
- C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
- C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
- C10M105/32—Esters
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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
- C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
- C10M125/10—Metal oxides, hydroxides, carbonates or bicarbonates
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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
- C10M169/04—Mixtures of base-materials and additives
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/10—Sliding-contact bearings for exclusively rotary movement for both radial and axial load
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/10—Construction relative to lubrication
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- 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
- F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
- F16C41/008—Identification means, e.g. markings, RFID-tags; Data transfer means
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/20—Driving; Starting; Stopping; Control thereof
- G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
- G11B19/2036—Motors characterized by fluid-dynamic bearings
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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
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/06—Metal compounds
- C10M2201/062—Oxides; Hydroxides; Carbonates or bicarbonates
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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
- 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
- C10M2207/122—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms monocarboxylic
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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
- 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
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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
- 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
- C10M2207/126—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 monocarboxylic
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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
- 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
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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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/14—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to carbon atoms of six-membered aromatic rings
- C10M2207/141—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to carbon atoms of six-membered aromatic rings monocarboxylic
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- 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
- C10M2207/281—Esters of (cyclo)aliphatic monocarboxylic acids
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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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/282—Esters of (cyclo)aliphatic oolycarboxylic acids
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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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/283—Esters of polyhydroxy compounds
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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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/284—Esters of aromatic monocarboxylic acids
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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
- 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
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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
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
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- 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
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- 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
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- 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
- C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2370/00—Apparatus relating to physics, e.g. instruments
- F16C2370/12—Hard disk drives or the like
Definitions
- the present invention relates to a method for preventing deterioration of a lubricant, which is mainly used for lubrication of a bearing device, a lubricant, and a hydrodynamic bearing device using the lubricant.
- the bearing mechanism is usually lubricated with a lubricant. While the lubricant lubricates the parts that make up the bearing mechanism, it gradually deteriorates due to acid and so on. In particular, in a hydrodynamic bearing mechanism used for a spindle motor for a hard disk drive, the temperature during use rises to about 60 degrees and is used for a long period of time.
- a trimethylolpropane fatty acid triester is used as a base oil, and it contains a hindered phenol-based antioxidation agent and a benzotriazole derivative.
- Lubricants see Patent Document 1, lubricants containing specific hindered phenolic antioxidants and aromatic amine amine antioxidants in specific ratios (see Patent Document 2), carbonate ester base oil, sulfur Lubricant containing phenolic antioxidant and zinc-based extreme pressure agent (see Patent Document 3), Lubricant using phenolic acid / antioxidant for base oil mainly composed of carbonate (see Patent Document 4) ) Has been proposed.
- Patent Document 1 JP-A-1 188592
- Patent Document 2 Japanese Patent Laid-Open No. 1-225697
- Patent Document 3 JP-A-8-34987
- Patent Document 4 Japanese Patent Laid-Open No. 10-183159
- the period during which deterioration is suppressed can be extended, but a significant improvement is difficult.
- the period during which deterioration is suppressed can be extended to some extent by increasing the amount added, but if it exceeds a certain amount, the suppression period will not increase no matter how much it is increased.
- the present invention has been made in view of such problems, and it is possible to suppress deterioration, particularly oxidation deterioration, of a lubricant used for lubricating a bearing device or the like over a long period of time. With the goal.
- a nonionic compound that hardly dissolves in an ester-based lubricating oil is prepared, and a selected deterioration preventing agent is prepared and brought into contact with the ester-based lubricating oil. Lubricate the target with the ester lubricant in this state.
- the lubricating oil need not always be in contact with the deterioration preventing agent.
- the lubricating oil that lubricates the bearing device circulates inside the bearing device as the parts slide together, and it is sufficient to touch the deterioration preventive agent in the middle of this circulation flow. .
- the device to be lubricated is provided with a container for storing lubricating oil, particles of the deterioration preventing agent may be put into the container.
- a deterioration preventing agent that hardly dissolves in the lubricating oil is used, even if such deterioration preventing agent is added, separation or precipitation occurs.
- the lubricant can be brought into contact with the deterioration preventing agent, the deterioration of the lubricant can be prevented.
- the ionic compound refers to a substance that forms a molecule or a crystal by combining a cation and an anion mainly by ionic bond. Such substances are generally difficult to dissolve in oil.
- the following effects can be obtained by using an anti-degradation agent in contact with the lubricating oil that does not dissolve in the lubricating oil or does not dissolve in a slight force.
- impurities that dissolve in the lubricating oil from the surroundings are absorbed by the deterioration preventing agent, thereby preventing changes in the characteristics of the lubricating oil.
- a deterioration preventing agent that is only slightly dissolved in the lubricating oil can be always supplied, the state in which the lubricating oil contains a small amount of the deterioration preventing agent can be maintained for a long period of time.
- the physical properties of the lubricating oil such as viscosity are Even if a deterioration inhibitor is present, it does not change.
- the deterioration inhibitor to be used is selected from salts having a structure in which atoms constituting the acid molecule are substituted with hydrogen atom metal ions released as hydrogen cations upon ionization. You can also. These materials often have low solubility in ester-based lubricants.
- salts substances that exhibit an excellent effect of preventing deterioration are found, such as alkali metal carbonates, alkali metal hydrogen carbonates, and alkali metal carboxylates that show alkalinity when made into an aqueous solution.
- the deterioration preventing agent does not need to be solid.
- a solution obtained by dissolving an ionic compound in a solvent such as water may be used.
- the interface refers to the boundary that appears at the contact area when water and oil that do not mix with each other come into contact with each other. Not only the liquids but also the part where the solid and the liquid are in contact is called the interface.
- the deterioration preventing agent is held at any part of the shaft or the bearing, and the surface thereof is brought into contact with the lubricating liquid.
- a depression, a groove, a hole, or the like can be used. Further, it may be packed in the pores of a sintered member such as a metal sintered body.
- the deterioration preventing agent that has been used in the past is dissolved in the lubricating oil
- such a deterioration preventing agent is used in combination with the deterioration preventing agent that does not dissolve in the lubricating oil characterized in the present invention. You can also do it. By using together, deterioration is further suppressed.
- a lubricating oil that has good characteristics as a lubricating oil and can be used for a long period of time. Further, by using this lubricating oil, it is possible to obtain a highly reliable hydrodynamic bearing device that exhibits stable performance over a long period of time.
- FIG. 1 is a longitudinal sectional view showing a recording disk drive device.
- FIG. 2 is a longitudinal sectional view showing a spindle motor equipped with the hydrodynamic bearing device of the present invention.
- FIG. 3 is a diagram showing the rate of generation of acid and soot deterioration products with respect to a base oil of an alkali carbonate metal salt.
- FIG. 4 is a diagram showing the amount of sodium carbonate added to the base oil and the rate of formation of acid-degraded products.
- the base oil used in the lubricating oil of the present invention is an ester oil.
- ester oil Specifically, monoester, diester, polyol ester (trimethylolpropane, pentaerythritol monoole, dipentaerythritolore, neopentinoregiomonoreesterol, complex ester), polydaricol ester, glycerin ester, An aromatic ester etc. can be mentioned.
- ester-based lubricating oils such as alkylated diphenyl ethers, alkyl ether triphenyl ethers, alkylated tetraphenyl ethers, alkylated polyether ethers, various poly-olefins, various silicones. Oil or various fluorine oils may be added.
- strong prillic acid strong puric acid, lauric acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, oleic acid, ricinoleic acid, linoleic acid, linolenic acid, arachidonic acid, Any one of organic acids such as icosapentaenoic acid, erucic acid, docosahexaenoic acid, lignoceric acid, and methanol, ethanol, propanol, butanol, pentanol, hexanol, heptanol, octanol, nonanol, decano Monoesterol, which is composed of any one of monovalent anolecores such as alcohol, undenoyl, dodecanol, tridecanol, tetradecanol, pentadecanol and the like.
- Examples of the diester include malonic acid, methylmalonic acid, succinic acid, methylsuccinic acid, dimethylmalonic acid, ethylmalonic acid, glutamic acid, adipic acid, dimethylsuccinic acid, pimelic acid, tetramethylsuccinic acid, suberic acid, and azelain.
- Any one of organic acids having two carboxy groups such as acid, sebacic acid and brassic acid, and methanol, ethanol, propanol, butanol, pentanol, hexanol, heptanol, octanol, nonanol, decanol, undephenol, dodecanol And diesters consisting of two molecules of the same kind or two kinds of molecules among monohydric alcohols such as tridecanol, tetradecanol and pentadecanol.
- polyol ester examples include trimethylolethane, trimethylolpropane, and pentaerythritol, and strong prillic acid, strong puric acid, lauric acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, and olein.
- polyol esters composed of any one of acids, ricinoleic acid, linoleic acid, linolenic acid, arachidonic acid, icosapentaenoic acid, erucic acid, docosahexaenoic acid, and lignoceric acid.
- Examples of the polydaricol ester include force prillic acid, force puric acid, lauric acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, oleic acid, ricinoleic acid, linoleic acid, linolenic acid, arachidonic acid, icosapentaenoic acid , Glycerin ester consisting of any of L-force acid, docosahexaenoic acid, lignoceric acid and polydaricol
- Examples of the glycerin ester include mono-fatty acid glycerin ester, di-fatty acid glycerin ester, and tri-fatty acid glycerin ester.
- Fatty acids bound to glycerin are: strength prillic acid, strength purine acid, lauric acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, oleic acid, ricinoleic acid, linoleic acid, linolenic acid, arachidonic acid, icosapentaenoic acid Any one or more of erucic acid, docosahexaenoic acid, and lignoceric acid.
- Polyethylene ether may be one having no alkyl group, or one having a linear or branched alkyl group.
- alkyl group include, for example, Til, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n pentyl, isopentyl, neopentyl, tert pentyl, 2-methinolebutinole, n-hexyl, isohexyl, 3-methylpentyl, ethylbutyl, n-heptyl, 2-methylhexyl, n-octyl, 2-ethylhexyl, 3 methylheptyl, n-nonyl, methyloctyl, ethylpeptyl, n-decyl, n-undecyl, n-dodecyl,
- the base oil of the lubricating oil of the present invention a diester oil is used, but it is also possible to use a mixture of the above base oils. Two or more kinds of oils can be mixed by a conventionally known mixing method.
- a deterioration inhibitor selected from ionic compounds is added to the base oil of the lubricating oil.
- the ionic compound refers to a substance in which a cation and an anion are bonded mainly by ionic bonds to form a molecule or a crystal.
- Such ionic compounds generally have low solubility in oil.
- a substance that hardly dissolves in such base oil is used as a deterioration preventing agent.
- alkali metal carbonates, alkali metal hydrogen carbonates, and alkali metal carboxylates are particularly suitable.
- the lithium salt has little effect on preventing the deterioration of acid.
- These metal carbonates may be used alone or in combination of two or more.
- the acid dissociation constant pKa of these substances is approximately in the range of 9-11.
- the carboxylic acid constituting the carboxylic acid metal salt includes various types, such as aliphatic saturated monocarboxylic acid, aliphatic unsaturated carboxylic acid, aliphatic dicarboxylic acid, and aromatic carboxylic acid. It is done.
- aliphatic saturated monocarboxylic acid examples include formic acid, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, strong prillic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, Straight-chain saturated acids such as arachidic acid, serotic acid, rataceric acid, or isopropionic acid, isobutanoic acid, isopentane Acid, 2-methylpentanoic acid, 2-methylbutanoic acid, 2,2-dimethylbutanoic acid, 2-methylhexanoic acid, 5-methylhexanoic acid, 2,2 dimethylheptanoic acid, 2-ethyl-2-methylbutanoic acid, 2-Ethylhexanoic acid, dimethylhexanoic acid, 2-n-propylpentanoic acid, 3, 5, 5-trimethylhexanoic acid, dimethyloctanoic acid, isotridecano
- Examples of the unsaturated carboxylic acid include lumitoreic acid, oleic acid, elaidic acid, linoleic acid, linolenic acid, and unsaturated hydroxy acids such as ricinoleic acid.
- Examples of the aliphatic dicarboxylic acid include adipic acid, azelaic acid, and sebacic acid, and examples of the aromatic carboxylic acid include benzoic acid, phthalic acid, trimellitic acid, and pyrometic acid.
- alicyclic fatty acids such as naphthenic acid can be used. Two or more of the above carboxylic acids may be used in combination.
- the number of metal elements combined per one carboxylic acid is not limited to one, and may be two or more. In addition, one or more metal carbonates and metal carboxylates may be used.
- phenolic antioxidants include 4,4'-methylenebis (2,6ditert-butylbutyl), 4,4,1bis (2,6ditert-butylphenol), 4,4, 1-bis (2-methyl 6-tert-butylphenol), 2, 2, 1-methylenebis (4-ethyl-6-tert-butylphenol), 2, 2, -methylenebis (4-methyl-6-tert-butylphenol), 4, 4, -butylidenebis ( 3-methyl-6-tert-butylphenol), 4, 4, monoisopropylidenebis (2, 6-dibutylbutylphenol), 2, 2, -methylenebis (4-methyl-6-noylphenol), 2, 2'-isobuty Redenbis (4, 6 dimethyl phenol), 2, 2, monomethylene bis (4-methyl 6 cyclohexylphenol), 2, 6 tert butyl 4 methyl phenol, 2, 6 tert butyl 4 2,4 Dimethyl-6-tert-Butylphenol, 2,6 Di-tert----
- Examples of the amine-based antioxidation agent include monoalkyl diphenylamines such as monooctyldiphenylamine and mono-nordiphenylamine, 4, 4 'dibutyldiphenylamine, 4, 4 '-Dipentyldiphenylamine, 4,4'-dihexyldiphenylamine, 4,4'-diheptyldiphenylamine, 4,4'-dioctyldiphenylamine, 4,4'-zino Dialkyldiphenylamines such as -rudiphenylamine, polybutyldiphenylamines such as tetrabutyldiphenylamine, tetrahexyldiphenylamine, tetraoctyldiphenylamine, tetra-diphenylamine, tetra-diphenylamine, ⁇ -naphthylamine , phenylene Lou ⁇
- the content thereof is usually 5.
- the amount is preferably 3.0% by weight or less, more preferably 1.0% by weight or less. If its content exceeds 5.0% by weight, it is sufficient to match the blending amount. This is not preferable because it does not provide a good anti-oxidation property.
- the viscosity index improver the pour point depressant, the metal deactivator, the surfactant, the antifungal agent, the corrosion inhibitor, and the like have been conventionally produced while further producing the effects of the present invention as necessary.
- Various known additives may be blended.
- the composition of 12 types of lubricants according to the present invention and 7 types of comparative lubricants will be described.
- the base oil used for embodiment mentioned below is a diester.
- Embodiment 1 1% by weight of sodium carbonate is added to 100 parts by weight of base oil.
- Embodiment 2 1% by weight of sodium carbonate is added to 100 parts by weight of base oil, and 2, 6 g te rt-butyl- A mixture of 4 ethylphenol and 4, 4 'dibutyldiphenylamine 0
- Embodiment 3 1% by weight of sodium hydrogen carbonate and 100% by weight of base oil, and 0.2% by weight of a mixture of 2,6 ditert-butyl-4-ethylphenol and 4,4,1-dibutyldiphenylamine, Thrown in.
- Embodiment 4 1 wt% of lithium carbonate with respect to 100 parts by weight of base oil, and a mixture of 2,6 tert-butyl-4-ethylphenol and 4,4'dibutyldiphenylamine is 0.
- Embodiment 5 1 part by weight of potassium carbonate with respect to 100 parts by weight of the base oil, and a mixture of 2,6 di-tert-butyl-4-ethylphenol and 4,4′-dibutyldiphenylamine is 0.
- Embodiment 6 1 part by weight of rubidium carbonate with respect to 100 parts by weight of base oil, and a mixture of 2,6 di-tert-butyl-4-ethylphenol and 4,4 'dibutyldiphenylamine
- Embodiment 7 1 part by weight of cesium carbonate with respect to 100 parts by weight of base oil, and a mixture of 2,6 tert-butyl-4-ethylphenol and 4,4′dibutyldiphenylamine is 0.
- Embodiment 8 1 part by weight of sodium formate and 100 parts by weight of base oil and a mixture of 2,6 di-tert-butyl-4-ethylphenol and 4,4'-dibutyldiphenylamine
- Embodiment 9 1 wt% of sodium acetate and 100% by weight of base oil and a mixture of 2,6 di-tert-butyl-4-ethylphenol and 4,4'dibutyldiphenylamine
- Embodiment 10 Ethylenediamin tetraacetic acid monosodium (EDTA) per 100 parts by weight of base oil
- Embodiment 11 0.5 parts by weight of sodium carbonate and 100 parts by weight of base oil, and a mixture of 2,6 ditert-butyl-4-ethylphenol and 4,4,1 dibutyldiphenylamine 2% by weight input.
- Embodiment 12 0.25 wt% sodium carbonate with respect to 100 parts by weight of the base oil, and a mixture of 2,6-di-tert-butyl-4-ethylphenol and 4,4'dibutyldiphenylamine 0.2% by weight input.
- Comparative Example 2 To 100 parts by weight of base oil, 0.2% by weight of an anti-oxidation agent mixed with 2,6 ditert-butyl-4-ethylphenol and 4,4'dibutyldiphenylamine was added. Things.
- Comparative Example 3 1% by weight of calcium carbonate with respect to 100 parts by weight of base oil, and 0.2% by weight of a mixture of 2,6 di-ter-butyl-4-ethylphenol and 4,4′-dibutyldiphenylamine , What I put in.
- Comparative Example 4 1 part by weight of barium carbonate with respect to 100 parts by weight of the base oil and a mixture of 2,6 di-tert-butyl-4-ethylphenol and 4,4′-dibutyldiphenylamine 2% by weight input.
- Comparative Example 5 1% by weight of jetyl carbonate and 100% by weight of base oil, and a mixture of 2,6 di-tert-butyl-4-ethylphenol and 4,4′-dibutyldiphenylamine
- Comparative Example 6 1% by weight of sodium sulfate with respect to 100 parts by weight of the base oil, and a mixture of 2,6 di-tert-butyl-4-ethylphenol and 4,4′-dibutyldiphenylamine
- Comparative Example 7 0.3% by weight of sodium hydroxide and 100% by weight of base oil, and a mixture of 2,6 di-tert-butyl-4-ethylphenol and 4,4′-dibutyldiphenylamine
- Embodiments 1 to 10 and Comparative Examples 1 to 7 were subjected to the following high-pressure oxygen test to investigate the oxidative deterioration of the lubricating oil.
- the lubricant was held in a thermostatic bath at 150 ° C. for 60 hours under oxygen filling (0.9 MPa) (8 hours for Embodiment 1 and Comparative Example 1), and then the deterioration rate of the lubricating oil was measured.
- Embodiment 1 has a significantly low degradation rate of polymer acid. is there. In other words, high molecular oxidative degradation is remarkably suppressed by the introduction of sodium carbonate.
- Embodiment 2 When the analysis values of Embodiment 2 and Comparative Example 2 are compared, in Embodiment 2, the polymer oxidative degradation rate is further improved than that in Embodiment 1, and both the strength and the low molecular acid degradation rate are reduced. Great improvement. That is, it can be seen that sodium carbonate further suppresses both high-molecular oxidative degradation and low-molecular oxidative degradation in the presence of conventional oxidative degradation inhibitors.
- Table 2 shows Embodiments 4, 2, 5, 6, and 7 extracted from the embodiments of Table 1.
- Lithumka also has a table comparing the effects of alkali metal carbonates up to cesium.
- Figure 3 shows this result in a graph.
- lithium carbonate is not very clear as it suppresses the deterioration of acidity.
- Lithium is originally a somewhat special element among alkali metals, and carbonates have different physical properties from other alkali metal carbonates. Such a difference may be a difference in the amount of improvement.
- Table 3 shows the results of the high-temperature oxygen test for Embodiments 2, 11, 12 and Comparative Example 2.
- Lubricant (Embodiment 13) in which 1 mL of metal carbonate aqueous solution was added to 50 g of base oil to which a mixture of 2, 6 g tert-butyl-4 ethynyl and 4,4 'dibutyldiphenylamine was added, and 2, Prepare a lubricant (Embodiment 14) in which 1.2 ml of an aqueous solution of EDTA-4Na is added to a base oil mixed with a mixture of 6 tert-butyl-4-butylphenol and 4,4′-dibutyldiphenylamine. It was used for the acid stability test.
- the RBOT value was calculated. That is, water, copper coil, and lubricating oil are put together in the sealable container together with the above aqueous solution, pressurized to 620 kPa with oxygen, the sealed container is put in a thermostatic bath at 150 degrees, and the container is placed at 30 degrees. While maintaining this angle, it continued to rotate at 100 revolutions per minute. The time from when the internal pressure reached the maximum until the pressure dropped to 175 kPa was measured. The same test was performed for the lubricating oil of Comparative Example 2 without adding the aqueous solution. In this case, the lubricating oil was subjected to the test in contact with water that was not an aqueous solution. The results are shown in Table 4.
- FIG. 1 shows the internal configuration of a disk drive device (hard disk device in this example) 60.
- the interior of the housing 61 of the disk drive device 60 is a clean space with extremely little dust.
- a spindle motor 1 for driving a disc on which a disc-shaped recording medium 62 on which information is recorded is mounted, and an access unit 63 for writing and reading information on the recording medium 62. Has been.
- FIG. 2 is a longitudinal sectional view showing the configuration of the spindle motor 1.
- the spindle motor 1 includes a stationary member and a rotating member.
- the rotating member is supported to be rotatable about the rotating shaft portion 32 with respect to the fixed member.
- the base 10 has a flat portion 11 provided at the center thereof and an annular boss portion 13 provided at the center of the flat portion 11.
- An annular recess is formed between the annular boss portion 13 and the annular step portion 14 provided on the outer peripheral portion of the flat portion 11.
- a state 17 fixed to the flat portion 11 and a rotor magnet 34 attached to a hub 31 to be described later are disposed in this recess.
- the annular boss portion 13 is provided at a position near the outer peripheral portion of the cylindrical support wall 15 protruding upward, and the stator 17 is fixed to the outer periphery thereof.
- the stator 17 also has a force with an annular stator core 17a formed by laminating a plurality of electromagnetic steel sheets, and a multiphase (for example, three-phase) winding 17b wound around each tooth of the stator core 17a.
- the stator 17 is fixed by using a means such as press-fitting or adhesion by fitting a stator core 17a to the cylindrical support wall 15.
- the stator 17 is fixed to the cylindrical support wall 15.
- the fixing method is press-fitting, adhesion or the like.
- the bearing stationary portion 20 includes a substantially cylindrical sleeve 21 and a counter plate 22 that closes the lower end opening of the sleeve 21.
- the inner peripheral surface of the through hole of the sleeve 21 is formed over almost the entire length of the sleeve 21, and is formed by a small-diameter inner peripheral surface 21a where the radial bearing portion is located, and a lower-diameter inner peripheral surface 21a located under the sleeve 21.
- the inner diameter inner peripheral surface 21b is expanded, and the inner diameter inner surface 21c is located at the lowermost end of the sleeve 21 and is further expanded from the inner diameter inner surface 21b.
- the counter plate 22 is disposed in a space inside the large-diameter inner peripheral surface 21c, and is fixed to the sleeve 21 by a method such as press-fitting, pressing, welding, or bonding.
- the lower half of the outer peripheral surface of the sleeve 21 is fixed to the inner peripheral surface of the annular boss 13 by a method such as press fitting, bonding, or welding.
- a tapered surface 23 is formed on the upper outer peripheral surface of the sleeve 21 to form an inner peripheral surface of a taper seal portion described later.
- the tapered surface 23 has a shape in which the central axial force of the bearing is also separated as it goes upward in the figure.
- the rotor 30 includes an inverted cup-shaped hub 31 and a rotation shaft portion 32 disposed at the rotation center position of the hub 31. Since the rotary shaft portion 32 is supported by the bearing stationary portion 20, the rotor 30 is rotatable with respect to the flat portion 11.
- the hub 31 is made of a ferromagnetic material such as iron or stainless steel.
- a cylindrical portion 31b extending downward in the figure is connected to the outer peripheral portion of the disc portion 3 la constituting the top plate portion. At the lower end of the cylindrical part 3 lb, there is a flange part 31c projecting radially outward.
- An annular wall 31d extending downward from the disk portion 31a is arranged inside the cylindrical portion 31b.
- the annular wall 31d is disposed between the sleeve 21 and the cylindrical support wall 15 and surrounds the upper outer periphery of the sleeve 21.
- the annular wall 31d forms a labyrinth gap constituting a labyrinth seal with the cylindrical support wall 15.
- the mounting hole 31e is formed in the center of the disk portion 31a, and the upper end portion of the rotating shaft portion 32 having a slightly smaller diameter is press-fitted therein. As a result, the hub 31 and the rotating shaft 32 are integrated.
- the rotating shaft portion 32 is hollow, and an internal thread 32b is formed on the inner peripheral surface over almost the entire length.
- the outer peripheral surface 32a of the rotary shaft portion 32 and the small-diameter inner peripheral surface 21a of the sleeve 21 face each other in the radial direction (radial direction) through a slight gap.
- the tip of the rotary shaft portion 32 passed through the sleeve 21 slightly protrudes below the small-diameter inner peripheral surface 21a.
- the retaining member 33 has a male screw portion 33a and a circular plate portion 33b that are screwed into the female screw 32b of the rotary shaft portion 32.
- the circular plate portion 33b has an outer diameter larger than the outer diameter of the rotating shaft portion 32 and smaller than the inner diameter of the medium-diameter inner peripheral surface 21b.
- a gap is secured between the circular plate portion 33b and the sleeve, and the rotation shaft portion 32 including the retaining member 33 can freely rotate with respect to the sleeve 21.
- annular mouth magnet 34 formed by arranging a plurality of magnetic poles in the circumferential direction is arranged inside the cylindrical portion 31b of the hub 31.
- the rotor magnet 34 is disposed at a position surrounding the stator 17 from the outer periphery.
- a hub 31 made of a ferromagnetic material also serves as a background for the magnet 34.
- One or a plurality of disc-shaped recording disks (hard disks) (not shown) are placed on the flange portion 31c of the hub 31.
- the hard disk has a hole in the center, and the edge of the hole is in contact with the outer peripheral surface of the cylindrical wall 31b.
- a clamp member is attached to the hub. The clamp member makes contact with the upper surface near the hole of the disk to clamp the disk. Insert and fix together with the lunge 31c.
- the clamp member is screwed to the rotary shaft portion by a screw screwed into the female screw 32b of the rotary shaft portion 32 from above.
- a minute gap is secured between the small-diameter inner peripheral surface 21a of the sleeve 21 and the outer peripheral surface 32a of the rotating shaft portion 32, and between the lower surface of the disk portion 31a of the hub 31 and the upper end surface of the sleeve 21. It is filled with lubricating oil 40. Lubricating oil 40 is loaded with a mixture of 2,6 di-tert-butyl 4-ethylphenol and 4,4'-dibutyldiphenylamine.
- the lubricating oil 40 also fills the space surrounded by the inner diameter inner peripheral surface 21 b of the sleeve 21, the surface of the counter plate 22, and the surface of the circular plate portion 33 b of the retaining member 33.
- Lubricating oil 40 is in contact with the outside air at a taper seal portion 41 formed by the inner peripheral surface 31f of the annular wall 31d of the hub 31 and the tapered surface 23 of the upper outer periphery of the sleeve 21, and the cross section has an arc shape.
- the liquid level is maintained.
- the taper seal portion 41 has a taper shape in which the gap decreases as it advances upward.
- herringbone-shaped dynamic pressure generating grooves are formed at two locations corresponding to 42 and 43 in the drawing and spaced apart from each other in the axial direction.
- the dynamic pressure generating groove generates a supporting force for holding the rotating shaft portion 32 in the radial direction when the spindle motor rotates in a predetermined direction.
- a pair of radial dynamic pressure bearings are disposed on the 42 and 43.
- a spiral dynamic pressure generating groove is also formed on the upper end surface of the sleeve 21 to constitute a thrust dynamic pressure bearing portion 44. This spiral groove increases the pressure of the lubricating oil inside the region where the dynamic pressure generating groove is formed when the spindle motor rotates in the predetermined direction.
- a supporting force is generated that causes the hub 31 to float upward in the axial direction.
- the sleeve 21 has a communication hole 45 penetrating in the axial direction, and the inside is filled with a lubricating oil 40.
- the through hole 45 has a lower end opened inside the inner peripheral surface 21b of the medium diameter portion, and an upper end opened closer to the inner peripheral portion than the thrust dynamic pressure bearing portion 44 in the thrust minute gap.
- the communication hole 45 is configured to allow communication between both end portions of the two radial dynamic pressure bearing portions 42 and 43, and enables the lubricating oil 40 to circulate within the bearing device.
- a recess 70 is formed on the outer peripheral portion of the inner peripheral surface 21b of the medium diameter portion. Inside this recess 70 In this case, potassium carbonate is fixed and is always in contact with the lubricating oil 40. Instead of this carbonated lithium, an aqueous solution of potassium carbonate may be arranged.
- a porous sintered metal can be used instead of stainless steel.
- potassium carbonate or an aqueous solution thereof can be sealed inside the hole.
- a state in which the lubricating oil and potassium carbonate are in contact with each other inside the sintered body can be created by filling the inside of the hole with the lubricating oil.
- potassium carbonate is disposed slightly below (71) the wall surface of the taper seal portion 41, and when the lubricating oil 40 expands due to a temperature rise and the interface moves downward, it contacts with the force potassium carbonate. It can also be set as the structure which does not. In this case, the lubricating oil 40 comes into contact with potassium carbonate, which is a deterioration preventing agent, only at a high temperature where deterioration progresses quickly. It is possible to effectively prevent the deterioration of the lubricating oil while minimizing the contact between the potassium carbonate and the lubricating oil.
- the dynamic pressure bearing device has a structure including two radial dynamic pressure bearing portions and one thrust dynamic pressure bearing portion.
- the structure of the dynamic pressure bearing device is limited to this.
- the formation position of the dynamic pressure generating groove is not limited to the position of the above embodiment.
- the ionic compound that is brought into contact with the lubricating oil is not limited to one that produces an effect of preventing the deterioration of acid.
- a material such as silica gel having hygroscopicity may be disposed in the recess 60 in FIG.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Inorganic Chemistry (AREA)
- Lubricants (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/304,595 US20090247433A1 (en) | 2006-06-15 | 2007-06-15 | Method of preventing lubricant from deteriorating, lubricant, and dynamic-pressure bearing device |
JP2008521261A JPWO2007145305A1 (ja) | 2006-06-15 | 2007-06-15 | 潤滑剤の劣化防止方法、潤滑剤、及び動圧軸受装置 |
KR1020087030569A KR101088193B1 (ko) | 2006-06-15 | 2007-06-15 | 윤활제의 열화 방지 방법, 윤활제 및 동압 축받이 장치 |
CN2007800223671A CN101473021B (zh) | 2006-06-15 | 2007-06-15 | 防止润滑剂劣化的方法、润滑剂和动压轴承装置 |
Applications Claiming Priority (2)
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JP2006-165426 | 2006-06-15 | ||
JP2006165426 | 2006-06-15 |
Publications (1)
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WO2007145305A1 true WO2007145305A1 (ja) | 2007-12-21 |
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PCT/JP2007/062074 WO2007145305A1 (ja) | 2006-06-15 | 2007-06-15 | 潤滑剤の劣化防止方法、潤滑剤、及び動圧軸受装置 |
Country Status (5)
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US (1) | US20090247433A1 (ja) |
JP (1) | JPWO2007145305A1 (ja) |
KR (1) | KR101088193B1 (ja) |
CN (1) | CN101473021B (ja) |
WO (1) | WO2007145305A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019043989A (ja) * | 2017-08-30 | 2019-03-22 | スギムラ化学工業株式会社 | プランジャー潤滑剤組成物 |
WO2020189193A1 (ja) * | 2019-03-19 | 2020-09-24 | 住友重機械工業株式会社 | 減速装置、減速装置の腐食防止方法、潤滑剤、潤滑剤の製造方法および添加剤 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130342062A1 (en) * | 2012-06-22 | 2013-12-26 | Nidec Corporation | Motor for rotationally supporting a hard disk |
US9368150B2 (en) * | 2014-09-24 | 2016-06-14 | HGST Netherlands B.V. | Charge control agent for fluid dynamic bearing motor lubricant |
DE102015112655A1 (de) * | 2015-07-31 | 2017-02-02 | Minebea Co., Ltd. | Basisfluid zur Verwendung in einer Schmiermittelzusammensetzung in fluiddynamischen Lagersystemen |
DE102019110510A1 (de) * | 2019-04-23 | 2020-10-29 | Minebea Mitsumi Inc. | Schmiermittelzusammensetzung für fluiddynamische Lagersysteme |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5261673A (en) * | 1975-11-14 | 1977-05-21 | Ntn Toyo Bearing Co Ltd | Lubrication grease composition |
JPS5430997A (en) * | 1977-08-12 | 1979-03-07 | Kao Corp | Lubricating composition for treating synthetic fiber |
JPS5430998A (en) * | 1977-08-12 | 1979-03-07 | Kao Corp | Lubricating composition for treating synthetic fiber |
JPS588799A (ja) * | 1981-07-10 | 1983-01-18 | Nissan Motor Co Ltd | 金属加工油剤 |
JPH0867796A (ja) * | 1994-08-29 | 1996-03-12 | Ntn Corp | 四フッ化エチレン樹脂組成物 |
JP2001247887A (ja) * | 2000-03-02 | 2001-09-14 | Sumitomo Metal Ind Ltd | 鋼材の冷間塑性加工用潤滑剤組成物 |
JP2006071104A (ja) * | 1997-07-02 | 2006-03-16 | Nsk Ltd | 転がり軸受 |
WO2006068270A1 (ja) * | 2004-12-24 | 2006-06-29 | Sumitomo Metal Industries, Ltd. | 冷間塑性加工用潤滑剤組成物及びそれを用いた冷間塑性加工方法 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030040442A1 (en) * | 1997-07-02 | 2003-02-27 | Nsk Ltd. | Rolling bearing |
JPH1190130A (ja) * | 1997-09-18 | 1999-04-06 | Tanaka Hidekazu | オイルの酸化・劣化防止方法及びオイルフィルタ |
JP2000063874A (ja) * | 1998-08-22 | 2000-02-29 | Nippon Grease Kk | Hdd用等軸受グリース組成物 |
JP4045942B2 (ja) * | 2002-12-06 | 2008-02-13 | 松下電器産業株式会社 | 流体軸受装置及びこれを用いた磁気ディスク装置 |
-
2007
- 2007-06-15 WO PCT/JP2007/062074 patent/WO2007145305A1/ja active Application Filing
- 2007-06-15 KR KR1020087030569A patent/KR101088193B1/ko active IP Right Grant
- 2007-06-15 US US12/304,595 patent/US20090247433A1/en not_active Abandoned
- 2007-06-15 JP JP2008521261A patent/JPWO2007145305A1/ja not_active Withdrawn
- 2007-06-15 CN CN2007800223671A patent/CN101473021B/zh not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5261673A (en) * | 1975-11-14 | 1977-05-21 | Ntn Toyo Bearing Co Ltd | Lubrication grease composition |
JPS5430997A (en) * | 1977-08-12 | 1979-03-07 | Kao Corp | Lubricating composition for treating synthetic fiber |
JPS5430998A (en) * | 1977-08-12 | 1979-03-07 | Kao Corp | Lubricating composition for treating synthetic fiber |
JPS588799A (ja) * | 1981-07-10 | 1983-01-18 | Nissan Motor Co Ltd | 金属加工油剤 |
JPH0867796A (ja) * | 1994-08-29 | 1996-03-12 | Ntn Corp | 四フッ化エチレン樹脂組成物 |
JP2006071104A (ja) * | 1997-07-02 | 2006-03-16 | Nsk Ltd | 転がり軸受 |
JP2001247887A (ja) * | 2000-03-02 | 2001-09-14 | Sumitomo Metal Ind Ltd | 鋼材の冷間塑性加工用潤滑剤組成物 |
WO2006068270A1 (ja) * | 2004-12-24 | 2006-06-29 | Sumitomo Metal Industries, Ltd. | 冷間塑性加工用潤滑剤組成物及びそれを用いた冷間塑性加工方法 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019043989A (ja) * | 2017-08-30 | 2019-03-22 | スギムラ化学工業株式会社 | プランジャー潤滑剤組成物 |
WO2020189193A1 (ja) * | 2019-03-19 | 2020-09-24 | 住友重機械工業株式会社 | 減速装置、減速装置の腐食防止方法、潤滑剤、潤滑剤の製造方法および添加剤 |
Also Published As
Publication number | Publication date |
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CN101473021A (zh) | 2009-07-01 |
CN101473021B (zh) | 2012-07-18 |
JPWO2007145305A1 (ja) | 2009-11-12 |
KR20090015123A (ko) | 2009-02-11 |
US20090247433A1 (en) | 2009-10-01 |
KR101088193B1 (ko) | 2011-11-30 |
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