WO2019039535A1 - Palier à roulement - Google Patents

Palier à roulement Download PDF

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Publication number
WO2019039535A1
WO2019039535A1 PCT/JP2018/031105 JP2018031105W WO2019039535A1 WO 2019039535 A1 WO2019039535 A1 WO 2019039535A1 JP 2018031105 W JP2018031105 W JP 2018031105W WO 2019039535 A1 WO2019039535 A1 WO 2019039535A1
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Prior art keywords
rolling
bearing
oil
steel
rolling bearing
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PCT/JP2018/031105
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English (en)
Japanese (ja)
Inventor
則暁 三輪
元博 伊藤
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Ntn株式会社
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Publication of WO2019039535A1 publication Critical patent/WO2019039535A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
    • C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
    • C10M133/04—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M133/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M133/08—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/24—Nitriding
    • C23C8/26—Nitriding of ferrous surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/62—Selection of substances
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten

Definitions

  • the present invention relates to a rolling bearing, and more particularly to a rolling bearing used at high-temperature and high-speed rotation in a motor such as an automobile electrical equipment / auxiliary device or industrial equipment.
  • Patent Document 1 As a prior art technique for improving the resistance to hydrogen embrittlement of rolling bearings, there is one in which a passivated film is formed on the steel surface by adding a large amount of Cr to the steel material to suppress the penetration of hydrogen into the steel (Patent Document 1) . Further, from the viewpoint of lubricant, there is known a method of improving resistance to hydrogen embrittlement by blending a passivator, bismuth dithiocarbamate, or the like with a lubricant (grease composition).
  • An object of the present invention is to provide a rolling bearing which can effectively prevent an early peeling due to hydrogen embrittlement under the conditions of use of the rolling bearing, and which can be used for a long time.
  • the rolling bearing of the present invention is a rolling bearing having an inner ring, an outer ring, a plurality of rolling elements interposed between the inner ring and the outer ring, and a lubricant composition enclosed around the plurality of rolling elements.
  • the lubricant composition is a lubricating oil or grease containing a base oil and an alkanolamine, and when the alkanolamine is the lubricating oil, it is 0.1 to 10 with respect to the entire lubricating oil.
  • 0.1 to 10 parts by weight is contained per 100 parts by weight of the total amount of the base oil and the thickener, and the above inner ring, the above outer ring, and the above rolling are included.
  • At least one bearing member selected from a moving body is made of steel, and the steel has a hydrogen diffusion coefficient of less than 2.6 ⁇ 10 ⁇ 11 m 2 / s.
  • the bearing member is characterized in that the surface layer thereof contains nitrogen, and the surface nitrogen concentration is 0.05 to 0.6 mass%.
  • the steel is a bearing steel, and the amount of retained austenite of the steel is 10 to 40% by volume.
  • the hardness of the bearing member is 58 to 64 HRC.
  • the alkanolamine is characterized in that it is diethanolamine.
  • the rolling bearing of the present invention has an inner ring, an outer ring, a plurality of rolling elements interposed between the inner ring and the outer ring, and a lubricant composition enclosed around the rolling elements, and this lubricant composition Is a predetermined composition containing a base oil and an alkanolamine, and at least one bearing member selected from an inner ring, an outer ring, and a rolling element is made of steel, and the steel has a hydrogen diffusion coefficient of 2. Because it is less than 6 ⁇ 10 -11 m 2 / s, it suppresses hydrogen generation and hydrogen diffusion inside the steel even if the oil film becomes thin under severe use conditions, and causes hydrogen embrittlement. Early peeling can be prevented.
  • the present inventors focused on the hydrogen diffusion coefficient of the steel material in order to delay the time for hydrogen to move through the steel material.
  • the use of a steel material having a small hydrogen diffusion coefficient (less than 2.6 ⁇ 10 ⁇ 11 m 2 / s) extends the time until the early peeling occurs.
  • peeling at a contact surface due to hydrogen embrittlement can be more effectively prevented by using a base oil in which alkanolamine is added as an essential additive as the lubricant composition.
  • the present invention is based on such findings.
  • the rolling bearing of the present invention has an inner ring, an outer ring, a plurality of rolling elements interposed between the inner ring and the outer ring, and a lubricant composition enclosed around the rolling elements.
  • the rolling bearing of the present invention will be described based on FIG. FIG. 1 is a cross-sectional view of a deep groove ball bearing.
  • the inner ring 2 having the inner ring rolling surface 2a on the outer peripheral surface and the outer ring 3 having the outer ring rolling surface 3a on the inner peripheral surface are concentrically arranged.
  • the inner ring rolling surface 2a and the outer ring rolling surface 3a A plurality of balls 4 which are rolling elements are disposed between the two.
  • the ball 4 is held by the holder 5.
  • both end openings 8 a and 8 b of the inner and outer rings are sealed by the seal member 6, and the lubricant composition 7 is enclosed at least around the ball 4.
  • the lubricant composition 7 intervenes on the rolling surface with the rolling element 4 and is lubricated.
  • the inner ring 2, the outer ring 3 and the balls 4 are all made of steel. Furthermore, the hydrogen diffusion coefficient of the steel material used for at least one bearing component selected from the inner ring 2, the outer ring 3 and the balls 4 is less than 2.6 ⁇ 10 ⁇ 11 m 2 / s.
  • the hydrogen diffusion coefficient is preferably less than 2.1 ⁇ 10 ⁇ 11 m 2 / s, more preferably less than 1.9 ⁇ 10 ⁇ 11 m 2 / s, still more preferably 1.6 ⁇ 10 ⁇ 11. It is less than m 2 / s, particularly preferably less than 1.4 ⁇ 10 ⁇ 11 m 2 / s. That is, from the viewpoint of the diffusion of hydrogen into the steel material, it is preferable that the hydrogen diffusion coefficient be smaller.
  • any material generally used as a bearing material can be used as long as the steel material has a hydrogen diffusion coefficient of less than 2.6 ⁇ 10 ⁇ 11 m 2 / s.
  • high carbon chromium bearing steel (SUJ1, SUJ2, SUJ3, SUJ4, SUJ5 etc .; JIS G 4805), carburized steel (SCr 420, SCM 420 etc .; JIS G 4053), stainless steel (SUS440C etc .; JIS G 4303), high speed Steel (M50, etc.), cold rolled steel, etc.
  • the steel materials used for each bearing member may be different materials.
  • the surface layer of the bearing member made of steel material it is preferable to subject the surface layer of the bearing member made of steel material to a nitriding treatment.
  • a nitriding treatment By nitriding the surface layer of the bearing steel, the hydrogen diffusion coefficient of the steel material can be reduced.
  • the inner and outer rings (bearing rings) are subjected to nitriding treatment on the rolling surfaces of the bearing rings.
  • the nitriding treatment is performed, for example, in an atmosphere in which ammonia gas is added to RX gas at a temperature of 850 ° C.
  • the surface nitrogen concentration of the bearing member is preferably 0.05 to 0.6% by mass, more preferably 0.2 to 0.6% by mass, and 0.4 to 0.6 More preferably, it is mass%. If the amount is less than 0.05% by mass, the reduction of the hydrogen diffusion coefficient is insufficient, and the effect of life improvement by nitriding may not be obtained. On the other hand, when the surface nitrogen concentration exceeds 0.6% by mass, a large amount of Cr carbonitride is generated, so the amount of Cr contributing to the hardenability is deficient and there is a possibility that sufficient hardenability can not be secured.
  • the bearing member is nitrided to be hardened and then tempered.
  • the tempering conditions are not particularly limited and publicly known conditions can be adopted, but in bearing steels (SUJ2, SUJ3 etc.), tempering is carried out under conditions such that the amount of retained austenite of the steel is 10 to 40% by volume. It is more preferable to temper under the conditions of preferably 20 to 40% by volume.
  • the tempering temperature is 150 to 200 ° C. Since austenite has a hydrogen diffusion coefficient smaller than that of martensite, by increasing the amount of retained austenite, the hydrogen diffusion coefficient of the bearing member can be reduced, and thus, early separation can be suppressed. On the other hand, when the amount of retained austenite exceeds 40% by volume, dimensional stability may be deteriorated.
  • the hardness of the bearing member made of a steel material is preferably 58 to 64 in Rockwell hardness, and more preferably 60.5 to 64. By setting it as the said numerical range, the deformation
  • Rockwell hardness is C scale hardness (HRC) (JIS Z 2245).
  • the inner ring and the outer ring are made of a bearing steel having a hydrogen diffusion coefficient of less than 2.6 ⁇ 10 -11 m 2 / s.
  • the surface nitrogen concentration of the running surface is 0.2 to 0.6% by mass
  • the residual austenite content of the bearing steel is 20 to 40% by volume
  • the hardness of the inner ring and the outer ring is 60.5 to 64 HRC.
  • the ball which is a rolling element is also comprised similarly to the said inner ring and outer ring
  • the lubricant composition will be described below.
  • the boundary lubrication condition may be a state in which the surfaces of the ferrous metals are in direct contact with each other. Since the lubricant composition of the present invention contains an alkanolamine as an essential component, even if the oil film becomes thin under severe conditions (boundary lubrication conditions) on the sliding surface, the frictional wear surface or the wear at the contact portion In the exposed iron-based metal nascent surface, the alkanolamine is adsorbed or the like to prevent direct contact between the nascent surface and the lubricating oil or grease.
  • Embodiments of the lubricant composition used for the rolling bearing of the present invention include (1) a lubricating oil essentially comprising a predetermined base oil and an alkanolamine, and (2) a predetermined base oil, a thickener and an alkanolamine There are two types of greases, which are essential components.
  • alkanolamines used in the present invention primary alkanolamines such as monoisopropanolamine, monoethanolamine, and mono-n-propanolamine, N-alkyl monoethanolamines, and secondary alkanolamines such as N-alkyl monopropanolamine And trialkanolamines such as triethanolamine, cyclohexyldiethanolamine, tri (n-propanol) amine, triisopropanolamine, N, N-dialkylethanolamine, and N-alkyl (or alkenyl) diethanolamine.
  • primary alkanolamines such as monoisopropanolamine, monoethanolamine, and mono-n-propanolamine
  • N-alkyl monoethanolamines such as N-alkyl monopropanolamine
  • trialkanolamines such as triethanolamine, cyclohexyldiethanolamine, tri (n-propanol) amine, triisopropanolamine, N
  • N-alkyl (or alkenyl) diethanolamine of the following formula (1) because it is excellent in compatibility with the base oil and in the ability to prevent premature peeling and also in availability.
  • R in the formula represents a linear or branched alkyl or alkenyl group having 1 to 20 carbon atoms.
  • the number of carbon atoms is preferably 1 to 12, and more preferably 1 to 8.
  • Specific compounds include, for example, N-methyldiethanolamine, N-ethyldiethanolamine, N-propyldiethanolamine, N-butyldiethanolamine, N-pentyldiethanolamine, N-hexyldiethanolamine, N-heptyldiethanolamine, N-octyldiethanolamine, N -Nonyldiethanolamine, N-decyldiethanolamine, N-undecyldiethanolamine, N-lauryldiethanolamine, N-tridecyldiethanolamine, N-myristyldiethanolamine, N-pentadecyldiethanolamine, N-palmityldiethanolamine, N-heptadecyldiethanolamine, N
  • the alkanolamines may be used alone or in combination of two or more. Further, the alkanolamine is preferably liquid or paste at room temperature and use temperature. In addition, it may be in a state of being dispersed in a solvent, mineral oil or the like. By using such an alkanolamine, even if the oil film of the sliding portion becomes thin under severe conditions, it easily enters the sliding portion.
  • the kinematic viscosity of the alkanolamine is preferably 10 to 100 mm 2 / s at 40 ° C., and more preferably 40 to 70 mm 2 / s at 40 ° C.
  • Examples of commercially available products of alkanolamines include Adekaqui Club FM-812, Adekaqui Club FM-832, and the like manufactured by Adeka.
  • the blending ratio of alkanolamine is 0.1 to 10% by mass with respect to the entire lubricant composition. Within this range, it is possible to prevent the unique peeling due to hydrogen embrittlement. If it exceeds 10% by mass, the reaction with iron becomes too high to cause corrosion and wear, etc., so that the life of peeling can not be extended.
  • the content is preferably 0.3 to 10% by mass, more preferably 0.3 to 5% by mass, and still more preferably 2 to 5% by mass.
  • the blending ratio of alkanolamine is 0.1 to 10 parts by weight with respect to 100 parts by weight in total of the base oil and the thickener. Within this range, it is possible to prevent the unique peeling due to hydrogen embrittlement. If the amount is more than 10 parts by weight, the reactivity with iron becomes too high to cause corrosion and wear, etc., so that the life of peeling can not be extended.
  • the amount is preferably 0.3 to 10 parts by weight, more preferably 0.3 to 5 parts by weight, and still more preferably 2 to 5 parts by weight.
  • At least one oil selected from mineral oil, highly refined mineral oil, and water-soluble lubricating oil is used as a base oil of the lubricant composition.
  • Mineral oils include spindle oil, refrigeration oil, turbine oil, machine oil, dynamo oil and the like.
  • Water-soluble lubricating oils include water-glycol based hydraulic oils and the like.
  • Highly refined mineral oil is obtained, for example, by catalytically hydrocracking and synthesizing a slug wax obtained from the residue of vacuum distillation.
  • the highly refined oil preferably has a sulfur content of less than 0.1% by mass, more preferably less than 0.01% by mass.
  • Other examples include GTL oils synthesized by the Fischer-Tropsch method.
  • At least one oil selected from alkyl diphenyl ether oil, PAO and ester oil is used as a base oil of the lubricant composition. These are excellent in heat resistance and lubricity.
  • PAO synthetic hydrocarbon oil
  • PAO synthetic hydrocarbon oil
  • PAO is usually a mixture of oligomers or polymers of ⁇ -olefins or isomerized ⁇ -olefins.
  • ⁇ -olefins include 1-octene, 1-nonene, 1-decene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1 -Nonadecene, 1-eicosene, 1-docosene, 1-tetradococene and the like, and mixtures thereof are usually used.
  • ester oil polyol ester oil, phosphoric acid ester oil, polymer ester oil, aromatic ester oil, carbonic ester oil, diester oil, polyglycol oil and the like can be mentioned. These base oils may be used alone or in combination of two or more.
  • the kinematic viscosity of the base oil is preferably 10 to 200 mm 2 / s at 40 ° C. More preferably, it is 10 to 100 mm 2 / s, further preferably 30 to 100 mm 2 / s.
  • a thickener is further blended.
  • the thickener is not particularly limited, and common thickeners that are usually used in the field of grease can be used.
  • soap-based thickeners such as metal soaps and complex metal soaps, and non-soap-based thickeners such as bentones, silica gels, urea compounds and urea-urethane compounds can be used.
  • metal soaps include sodium soap, calcium soap, aluminum soap, lithium soap and the like, and urea compounds
  • examples of the urea-urethane compound include diurea compounds, triurea compounds, tetraurea compounds, other polyurea compounds, diurethane compounds and the like.
  • the urea compound is obtained by reacting the polyisocyanate component with the monoamine component.
  • the polyisocyanate component phenylene diisocyanate, tolylene diisocyanate, diphenyl diisocyanate, diphenylmethane diisocyanate, octadecane diisocyanate, decane diisocyanate, hexane diisocyanate, etc. may be mentioned.
  • the monoamine component aliphatic monoamines, alicyclic monoamines and aromatic monoamines can be used.
  • aliphatic monoamines examples include hexylamine, octylamine, dodecylamine, hexadecylamine, octadecylamine, stearylamine and oleylamine.
  • alicyclic monoamines examples include cyclohexylamine and the like.
  • the aromatic monoamines include aniline and p-toluidine.
  • diurea compounds using aromatic diisocyanate as the polyisocyanate component for example, aromatic diurea compounds using aromatic monoamine as the monoamine component, aliphatic monoamines, are used because they are particularly excellent in heat resistance and durability. It is preferable to use aliphatic diurea compounds and alicyclic diurea compounds using alicyclic monoamines.
  • a base grease is obtained by blending a base oil with a thickener such as a urea compound.
  • the base grease having a urea compound as a thickener is prepared by reacting the above-mentioned polyisocyanate component and monoamine component in a base oil.
  • the proportion of the thickener contained in the base grease is 1 to 40% by mass, preferably 3 to 25% by mass. If the content of the thickener is less than 1% by mass, the thickening effect is reduced and the formation of the grease becomes difficult, and if it exceeds 40% by mass, the obtained base grease becomes too hard to obtain the desired effect. Become.
  • an alkanolamine is blended with a base oil, and a method of preparing a thickener using this base oil, or a method of preparing a grease and then adding a dispersion thereto is also possible.
  • the alkanolamine contains an amino group
  • the above-mentioned polyisocyanate component and monoamine component are reacted in a base oil to prepare a base grease, and then the alkanolamine is added. It is a preferred method.
  • the combined penetration is preferably in the range of 200 to 350. If the consistency is less than 200, oil separation may be small, resulting in poor lubrication. On the other hand, when the consistency is more than 350, the grease is soft and tends to flow out of the bearing, which is not preferable.
  • the alkanolamine is present as it is, not in the form of a reaction product like a salt with an acid. Therefore, as other additives, additives which form a salt with an alkanolamine such as fatty acid are not included.
  • the above-mentioned lubricant composition may contain known additives as needed, as long as the object of the present invention is not impaired.
  • Additives include, for example, antioxidants such as organic zinc compounds, amines and phenols, metal deactivators such as benzotriazole, viscosity index improvers such as polymethacrylates and polystyrenes, molybdenum disulfide, graphite and the like Examples thereof include solid lubricants, rust inhibitors such as metal sulfonates and polyhydric alcohol esters, esters, oil agents such as alcohols, and other antiwear agents. These can be added alone or in combination of two or more.
  • the grease it is preferable to contain at least one antioxidant selected from a phenolic antioxidant, an amine antioxidant and zinc dithiophosphate.
  • a phenolic antioxidant an amine antioxidant and zinc dithiophosphate.
  • zinc dithiophosphate is essential, and it is preferable to use one of a phenol type antioxidant and an amine type antioxidant together.
  • zinc dithiophosphate in combination with an amine antioxidant.
  • the blending ratio of these antioxidants is preferably 0.5 to 5 parts by weight in total with respect to 100 parts by weight in total of the base oil and the thickener.
  • ZnDTP zinc dithiophosphate
  • R 1 in the formula represents a primary or secondary alkyl group having 1 to 24 carbon atoms or an aryl group having 6 to 30 carbon atoms.
  • R 1 for example, methyl group, ethyl group, propyl group, isopropyl group, butyl group, secondary butyl group, isobutyl group, pentyl group, 4-methylpentyl group, hexyl group, 2-ethylhexyl group, heptyl group Octyl, nonyl, decyl, isodecyl, dodecyl, tetradecyl, hexadecyl, octadecyl, eicosyl, docosyl, tetracosyl, cyclopentyl, cyclohexyl, methylcyclohexyl, ethylcyclohexyl, dimethylcyclohexyl Group, cycloheptyl group, phenyl group
  • R 1 is preferably a primary alkyl group because it is excellent in stability and also contributes to the prevention of separation on the rolling contact surface due to hydrogen embrittlement. Also, in the case where R 1 is an alkyl group, the larger the number of carbon atoms, the better the heat resistance and the more easily it is soluble in the base oil. On the other hand, the smaller the number of carbon atoms, the better the wear resistance and the like, and the less soluble in the base oil. As a preferable commercial item of ZnDTP, for example, Adeka company make: Adekaqui Club Z112 etc. are mentioned.
  • the lubricant composition does not contain an alkali metal salt of an inorganic acid and an alkaline earth metal salt of an inorganic acid. Furthermore, it is preferable that the lubricant composition does not contain a solid powder that does not dissolve in the base oil.
  • FIG. 1 illustrates ball bearings as rolling bearings
  • the rolling bearings of the present invention are cylindrical roller bearings other than those described above, tapered roller bearings, self-aligning roller bearings, needle roller bearings, thrust cylindrical roller bearings, thrust tapered rollers Bearings, thrust needle roller bearings, thrust spherical roller bearings, etc. can also be used.
  • the rolling bearing according to the present invention has the bearing member made of the above-described steel material and encloses the above-described lubricant composition, so that it is possible to prevent specific peeling due to hydrogen embrittlement at the contact surface of the bearing member.
  • the bearing life is extended even under severe conditions such as high temperature and high speed. For this reason, it can be suitably used as a bearing used in high-temperature high-speed rotation used for a motor of an automobile electrical equipment / auxiliary machine or an industrial device.
  • rolling bearings such as alternators, compressors, electromagnetic clutches for car air conditioners, intermediate pulleys, electric car motors and accessories such as electric fan motors, motors for ventilation fans, blower motors for fuel cells, cleaner motors, fan motors, servo motors, stepping motors Motors for industrial machines, starter motors for automobiles, electric power steering motors, tilt motors for steering adjustment, blower motors, wiper motors, motors for electrical equipment such as power window motors, motors for driving electric vehicles and hybrid vehicles, etc. It can be suitably used as a rolling bearing.
  • Hydrogen Diffusion Coefficient Measurement Test pieces made of each steel material were produced by the steel types shown in Table 1 and heat treatment.
  • the heat treatment of the reference examples 1, 2 and 4 was carried out by carbonitriding treatment by adding ammonia gas in an RX gas atmosphere at 850 ° C. for quenching and then tempering at 180 ° C. for 120 minutes.
  • the heat treatment without carbonitriding in Comparative Example 1 and Reference Examples 3 and 5 was heated in an RX gas atmosphere at 850 ° C., subjected to slip oil quenching, and then subjected to tempering at 180 ° C. for 120 minutes.
  • Table 1 also shows the surface nitrogen concentration and retained austenite amount of each steel material.
  • FIG. 2 shows a schematic view of an apparatus for measuring the hydrogen diffusion coefficient of a steel material.
  • the hydrogen diffusion coefficient results are shown in Table 1 and FIG.
  • the hydrogen diffusion coefficient of the steel material in which SUJ 2 of Comparative Example 1 was sous hardened was 2.63 ⁇ 10 -11 m 2 / s, while the hydrogen diffusion coefficients of the steel materials of Reference Examples 1 to 5 were all compared. It was smaller than the value of Example 1.
  • the hydrogen diffusion coefficient was smaller in the steels which had been carbonitrided.
  • the higher the surface nitrogen concentration the smaller the hydrogen diffusion coefficient.
  • the residual hardening of SUJ2 and SUJ3 is compared, the larger the amount of retained austenite, the smaller the hydrogen diffusion coefficient.
  • FIG. 5 shows the relationship between the hydrogen diffusion coefficient and the life (L 10 ) in the rolling fatigue test.
  • the results of Reference Examples 1 to 4 and Comparative Example 1 are plotted in FIG.
  • FIG. 5 there is a linear correlation between the hydrogen diffusion coefficient and the life, and the smaller the hydrogen diffusion coefficient, the longer the life. From this, it can be said that by setting the hydrogen diffusion coefficient to be smaller than Comparative Example 1 (2.63 ⁇ 10 ⁇ 11 m 2 / s), it is possible to suppress the early peeling caused by the hydrogen embrittlement.
  • the obtained grease was sealed in a rolling bearing to conduct a rapid acceleration / deceleration test.
  • the test method and test conditions are shown below. Also, the results are shown in Table 2.
  • the above grease was sealed in an inner ring rotating rolling bearing (inner ring, outer ring, steel ball bearing steel SUJ2) supporting an axis of rotation by simulating an alternator, which is an example of an electrical accessory, and a rapid acceleration / deceleration test was conducted.
  • the rapid acceleration / deceleration test conditions were such that the load on the pulley attached to the end of the rotary shaft was set to 1960 N, the rotational speed was set to 0 rpm to 18000 rpm under an atmosphere of 120 ° C., and 0. 1 in the test bearing (6203).
  • the test was performed with a current of 5 A flowing. Then, the time when the abnormal peeling occurred in the bearing and the vibration of the vibration detector became equal to or more than the set value and stopped (the peeling occurrence life time, h) was measured.
  • each reference lubricant compounded with alkanolamine was able to significantly extend the peeling occurrence life time as compared with each comparative lubricant. It is considered that this is because the specific peeling due to hydrogen embrittlement occurring on the rolling contact surface was effectively prevented.
  • Comparative Lubricant 3 in the case of the diol, the effect of extending the life time of peeling was not obtained.
  • Reference lubricants 8-11, comparative lubricants 7-9 A needle roller bearing (inner ring outer diameter ⁇ 24 mm, outer ring inner diameter ⁇ 32 mm, width 20 mm, roller ⁇ 4 ⁇ 16.8 mm ⁇ 14) was lubricated with a lubricating oil of the composition shown in Table 3, and a life test was conducted.
  • the life test is a rapid acceleration / deceleration repeating a radial load 6.76 kN, rotational speed 3000 rpm, 500 rpm, 3000 rpm, 500 rpm in order, the bearing is rotated at an ambient temperature of 100 ° C, and peeling time occurs on the rolling surface Life time, h) was measured.
  • the results are shown in Table 3.
  • each reference lubricant blended with alkanolamine (diethanolamine) was able to significantly extend the exfoliation occurrence life time as compared with the comparative lubricant 7 using only water glycol type hydraulic oil.
  • the reference lubricant 11 in which alkanolamine (diethanolamine) is blended in the lubricant oil consisting of mineral oil and water greatly extends the exfoliation occurrence life time as compared with the comparative lubricant 9 which is the same lubricant which does not blend this. did it.
  • Table 4 shows L 10 , L 50 and Weibull slope (shape parameter) e obtained by applying to a two-parameter Weibull distribution as the peeling lives of Example 1 and Comparative Examples 1 to 3.
  • L 10 could be extended by 55.6 hours as compared with Comparative Example 1 by adding an alkanolamine.
  • Comparative Example 3 L 10 could be extended by 35.4 hours as compared with Comparative Example 1 by reducing the hydrogen diffusion coefficient.
  • Example 1 L 10 can be extended by 170.7 hours as compared with Comparative Example 1 by adding an alkanolamine and reducing the hydrogen diffusion coefficient, and Comparative Example 2 and Comparative Example 1 Even in comparison with Example 3, the life extending effect was remarkable.
  • the predetermined steel material is used for the bearing member and the predetermined lubricant composition is enclosed, it is possible to effectively prevent the early peeling on the contact surface due to hydrogen embrittlement, and the long life is achieved. is there. Therefore, it can be widely used as a rolling bearing, and is particularly suitable for a rolling bearing used under severe conditions of use.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Lubricants (AREA)
  • Rolling Contact Bearings (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

L'invention concerne un palier à roulement qui peut être efficacement empêché de subir un décapage précoce associé à une fragilité à l'hydrogène dans les conditions où le palier à roulement est utilisé, et qui peut être utilisé pendant une longue période de temps. Le palier à roulement (1) est pourvu d'une bague interne (2), d'une bague externe (3), de multiples billes (4) disposées entre la bague interne (2) et la bague externe (3) et d'une composition lubrifiante (7) remplie autour des multiples billes (4), la composition lubrifiante (7) étant une huile lubrifiante ou une graisse comprenant chacune une huile de base et une alcanolamine, l'alcanolalimine est contenue dans une quantité de 0,1 à 10 % en masse par rapport à la quantité totale de l'huile lubrifiante lorsque la composition lubrifiante est une huile lubrifiante et est contenue dans une quantité de 0,1 à 10 parties en poids par rapport à la quantité totale, c'est-à-dire 100 parties en poids, de l'huile de base et d'un agent épaississant lorsque la composition lubrifiante est une graisse, au moins un élément de support choisi parmi la bague interne (2), la bague externe (3) et les billes (4) étant réalisé à partir d'un matériau d'acier et le matériau d'acier ayant un coefficient de diffusion d'hydrogène inférieur à 2,6 × 10-11 m2/s.
PCT/JP2018/031105 2017-08-23 2018-08-23 Palier à roulement WO2019039535A1 (fr)

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EP4317374A1 (fr) * 2021-03-30 2024-02-07 NTN Corporation Palier à roulement étanche

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002004003A (ja) * 2000-06-22 2002-01-09 Nsk Ltd 転動軸
JP2003227520A (ja) * 2001-11-27 2003-08-15 Nippon Parkerizing Co Ltd 回転部材およびその製造方法
JP2011168648A (ja) * 2010-02-16 2011-09-01 Showa Shell Sekiyu Kk 潤滑油組成物
JP2013119930A (ja) * 2011-12-08 2013-06-17 Ntn Corp 軸受部品、転がり軸受およびこれらの製造方法
JP2015021566A (ja) * 2013-07-19 2015-02-02 Ntn株式会社 転がり軸受
JP2016133144A (ja) * 2015-01-16 2016-07-25 Ntn株式会社 モータ用グリース封入軸受

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002004003A (ja) * 2000-06-22 2002-01-09 Nsk Ltd 転動軸
JP2003227520A (ja) * 2001-11-27 2003-08-15 Nippon Parkerizing Co Ltd 回転部材およびその製造方法
JP2011168648A (ja) * 2010-02-16 2011-09-01 Showa Shell Sekiyu Kk 潤滑油組成物
JP2013119930A (ja) * 2011-12-08 2013-06-17 Ntn Corp 軸受部品、転がり軸受およびこれらの製造方法
JP2015021566A (ja) * 2013-07-19 2015-02-02 Ntn株式会社 転がり軸受
JP2016133144A (ja) * 2015-01-16 2016-07-25 Ntn株式会社 モータ用グリース封入軸受

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