WO1999001527A1 - Palier rotatif - Google Patents
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- Publication number
- WO1999001527A1 WO1999001527A1 PCT/JP1998/002891 JP9802891W WO9901527A1 WO 1999001527 A1 WO1999001527 A1 WO 1999001527A1 JP 9802891 W JP9802891 W JP 9802891W WO 9901527 A1 WO9901527 A1 WO 9901527A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rolling
- lubricant
- bearing
- compound
- aromatic
- Prior art date
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Classifications
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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
- C10M169/06—Mixtures of thickeners and additives
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M115/00—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof
- C10M115/08—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof containing nitrogen
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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
- C10M117/00—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof
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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
- C10M125/08—Metal carbides or hydrides
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- 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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- 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
- C10M125/26—Compounds containing silicon or boron, e.g. silica, sand
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- 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
- C10M125/26—Compounds containing silicon or boron, e.g. silica, sand
- C10M125/30—Clay
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
- C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
- C10M129/26—Carboxylic acids; Salts thereof
- C10M129/28—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M129/30—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 7 or less carbon atoms
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- C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
- C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
- C10M129/26—Carboxylic acids; Salts thereof
- C10M129/28—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M129/38—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms
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- 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
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- C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
- C10M135/12—Thio-acids; Thiocyanates; Derivatives thereof
- C10M135/14—Thio-acids; Thiocyanates; Derivatives thereof having a carbon-to-sulfur double bond
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- C10M135/12—Thio-acids; Thiocyanates; Derivatives thereof
- C10M135/14—Thio-acids; Thiocyanates; Derivatives thereof having a carbon-to-sulfur double bond
- C10M135/18—Thio-acids; Thiocyanates; Derivatives thereof having a carbon-to-sulfur double bond thiocarbamic type, e.g. containing the groups
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- C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
- C10M135/20—Thiols; Sulfides; Polysulfides
- C10M135/28—Thiols; Sulfides; Polysulfides containing sulfur atoms bound to a carbon atom of a six-membered aromatic ring
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- C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
- C10M135/32—Heterocyclic sulfur, selenium or tellurium compounds
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- C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
- C10M135/32—Heterocyclic sulfur, selenium or tellurium compounds
- C10M135/36—Heterocyclic sulfur, selenium or tellurium compounds the ring containing sulfur and carbon with nitrogen or oxygen
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
- C10M137/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having no phosphorus-to-carbon bond
- C10M137/04—Phosphate esters
- C10M137/10—Thio derivatives
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- C10M139/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing atoms of elements not provided for in groups C10M127/00 - C10M137/00
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- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
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- C10M2201/061—Carbides; Hydrides; Nitrides
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- C10M2201/066—Molybdenum sulfide
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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
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
- F16C33/6633—Grease properties or compositions, e.g. rheological properties
Definitions
- the present invention relates to a rolling bearing, and particularly to an electric component of an automobile engine such as an alternator used in a case where water is mixed in a lubricant, in a high-temperature, high-speed rotation, or in an operating environment affected by vibration.
- the present invention relates to a rolling bearing that is suitable for Background art
- rolling bearings used on the assumption that moisture enters the lubricant include work roll bearings for rolling mills made of steel materials.
- a work roll bearing is provided with a contact rubber seal on a chock (bearing box) having a bearing therein, thereby preventing a large amount of rolling water from entering the chick, thereby providing a bearing inside the bearing.
- Water was prevented from mixing into the enclosed lubricant, but if the contact rubber seal deteriorated or was damaged, Water can enter the bearings and consequently water can enter the lubricant inside the bearing.
- a technology has recently been proposed to avoid the entry of water into the lubricant by installing a contact rubber seal inside the bearing (K.YAMAM0T0, M.YA MAZAKI, M. AKIYAMA, K. FURUMURA: ⁇ Introducing of Sealed Bearings for Work Roll Necks in Rolling Mills ”, Proceedings of the JSLE international Tribology Conference, pp. 609-614, July 8-10, 1985, Tokyo, Japan; ]
- the rubber attached to the zipper is used by using a contact rubber seal attached to the chock outside the receiving portion and a contact rubber seal attached to the inside of the bearing.
- the water concentration in the lubricant could be reduced from 40% to less than 10%, and the consumption of lubricant was 1/2000 It has been reported that the number of accidents was several times a year, and that there were no accidents that caused damage.
- Another important example of another rolling bearing in which moisture can enter the lubricant is a bearing for an electric / auxiliary device of an automobile engine.
- Electrical components of automobile engines Auxiliary equipment bearings are driven by belts external to the automobile engine, such as bearings for alternators, bearings for electromagnetic clutches for power and air conditioners, bearings for idler pulleys, and bearings for water pumps.
- the bearings for auxiliary equipment and auxiliary equipment are designed to easily penetrate muddy water or rainwater that jumps from the road surface into the bearings. Circulating water easily enters the inside of the bearing. From this point of view, in bearings for electrical components and accessories of automobile engines, the internal seal is used as a means to prevent water from entering the lubricant inside the bearing. Techniques for improving the sealing performance have been proposed (NSK Technical Journal, No. 660, pp. 15-22, 1995; and No. 652, pp. 66-67, 1992; Third conventional technology ”).
- Bearings for work rolls are generally used under high-temperature conditions, so it is difficult to apply a contact rubber seal used for bearings for work rolls and bearings for automotive wheels in consideration of heat resistance. It has been considered to use a high-temperature rubber to prevent water from entering.
- the bearings for automobile wheels and other rolling bearings are basically used to contact the lubricant inside the bearings by using contact rubber seals.
- these other conventional techniques for rolling are referred to as “fifth conventional technique”.
- Document 5 (Masao Seki: Rolling fatigue symposium preprints, pp. 125-130, 1993; hereinafter referred to as “Document 5”). According to Documents 4 and 5, even if water is not directly mixed into the lubricant from the outside, the lubricant may contain water due to environmental changes, etc. In order to avoid this, it is necessary to consider means other than the above-mentioned contact rubber seal as a countermeasure against water intrusion into the lubricant.
- the first prior art can reduce the water concentration in the lubricant from 40% to less than 10% as described above, and can reduce the consumption of the lubricant.
- a subsequent survey of the performance of bearings used for crawls revealed that the number of seizures had decreased dramatically.However, it was found that the operating time up to the occurrence of separation, that is, the bearing life L, did not improve much. .
- the reason for the decrease in the burn-in accident is that the contact rubber seal built into the bearing has reduced the outflow of lubricant to the outside.
- the reason that the bearing life L has not been improved is that the water content in the lubricant is not improved. This is considered to be due to the fact that the rolling contact fatigue strength of the bearing is greatly reduced by the mixing.
- the lubrication does not depend on the waterproof ability of the contact rubber seal as in the first prior art. There is a problem in that it is difficult to prevent almost completely moisture infiltration such that the water concentration in the agent is 100 ppm or less.
- the third prior art is similar in principle to the first prior art, in that the intrusion of moisture is prevented by a contact rubber seal, and as described above, the water concentration in the lubricant is reduced to 10%. It is difficult to suppress the concentration to 0 ppm or less, and there is a problem that desired durability cannot be obtained.
- the fifth prior art uses a contact rubber seal in principle, similarly to the first prior art, and has a problem that it is difficult to prevent perfect infiltration of moisture. .
- the thermal conductivity of stainless steel is lower than that of low alloy steel, so that seizure damage is liable to occur, and the above-mentioned lubrication method in which moisture is mixed in the lubricant.
- the corrosion resistance of the stainless steel is maintained by a passivation film formed on the surface.However, in a rolling bearing, when the raceway surface of a bearing ring contacts a rolling surface of a rolling element, the passivation film is formed. The pits are broken, and as a result, the corrosion selectively proceeds to form holes (pits), so that there is also a problem that separation rupture starting from the holes is likely to occur.
- the quenching temperature of stainless steel is as high as 110 ° C to 170 ° C, so it is necessary to use a salt bath furnace as the heating furnace. Therefore, there is also a problem that the production equipment may rise in price (Iron and Steel Institute of Japan: Heat Treatment of Steel Revised 5th Edition, p.563-568 (1989)).
- the stainless steel has a low thermal conductivity as described above, the grinding speed is reduced and the grinding cost is expensive.
- the stainless steel is a high alloy steel, There is also a problem that the cost may rise.
- the present invention has been made in view of such a problem, and has a sufficient bearing life even under a use condition where water is mixed into the lubricant from the outside or by dew condensation, or under the influence of vibration.
- a rolling bearing according to the present invention has a raceway ring composed of an outer ring and an inner ring, and is disposed so as to roll freely between the outer ring and the inner ring.
- a rolling bearing comprising a rolling element, wherein a lubricant is sealed in an annular space defined by the rolling element and the raceway, wherein a hydrogen ion index pH of the lubricant is 7 to 13;
- the first feature is that it is set.
- the applicant of the present application has conducted further studies focusing on the function of such an organic metal salt, and as a result, when the lubricant contains an organic metal salt, the hydrogen ion index pH is set to 5 or more. We have found that it is possible to prevent early peeling of bearings. Furthermore, it was also found that the same action and effect as in the case of the organic metal salt can be obtained when the lubricant contains ashless dialkyldithiol dibasic acid (ADTC) instead of the organic metal salt.
- ADTC ashless dialkyldithiol dibasic acid
- the second feature of the rolling bearing according to the present invention is that the lubricant contains an organometallic salt or ADTC, and the lubricant has a hydrogen ion exponent pH of 5 to 13.
- a method of preventing the progress of corrosion of the bearing portion in addition to the above-described method of suppressing the force source reaction, a method of forming between the non-metallic inclusions on the bearing material and the metal base material is used. It is considered effective to suppress the generation of the minute gap itself that can be made.
- by improving the oil film formation at the interface between the raceway surface and the raceway surface it is possible to reduce the tangential force between the raceway surface and the raceway surface, thereby suppressing the generation of minute gaps. Conceivable.
- the applicant of the present application has further studied diligently focusing on such a point, and as a result, the fine particles comprising an inorganic compound having an average particle diameter of 2 m or less are contained in the lubricant, and the hydrogen ion exponent pH of the lubricant is determined.
- a sufficiently strong oil film can be formed between the raceway surface and the raceway surface, thereby preventing metal-to-metal contact and improving the bearing life L under high temperature and high speed conditions. It turned out to be.
- the rolling bearing according to the present invention is characterized in that an inorganic compound having an average particle diameter of 2 m or less is contained in the lubricant, and the hydrogen ion exponent PH of the lubricant is set to 5 to 13. It is characterized by 3.
- the rolling bearing according to the present invention is characterized in that the thickener of the lubricant is a diurea compound containing an aromatic amine or a mixture of two or more of the diurea compounds, and that the lubricant has a hydrogen ion index pH Is set to 5 to 13 as the fourth feature.
- the intended purpose of the rolling bearing of the present invention can be achieved not only by the first to fourth features alone, but also by appropriately combining the first to fourth features.
- FIG. 1 is a characteristic diagram showing the relationship between the amount of TeDTC added and the separation life in the second embodiment.
- FIG. 2 is a characteristic diagram showing the relationship between the hydrogen ion index pH and the peeling life in the second embodiment.
- FIG. 3 is a characteristic diagram showing the relationship between the amount of the diurea compound added and the aromatic ring molar ratio Z in the fourth embodiment.
- Rolling bearings are generally used by enclosing a lubricant in a space defined by rolling elements and races. As described above, it is known that the lubricating condition including moisture in the lubricant causes a decrease in the rolling fatigue strength of the bearing material. It is not clear why the contamination reduces the rolling fatigue strength (E. Ioannides, B. Jacobson: "Dirty lubricants-reduced bearing life", Ball Bearing Journal Special '89, pp. 22-27, 1989).
- the present applicant has first started to theoretically elucidate the above mechanism. If water is mixed into the lubricant, it is difficult to form an oil film even when the amount of water is very small, and the rolling elements and the raceway make metal contact between the rolling surface and the raceway surface. However, the surface condition of the rolling elements and races is not uniform and uneven, and inevitable non-metallic inclusions such as oxides and sulfides are formed on the rolling surfaces and raceways. If water is mixed in the lubricant, a local battery is formed when water enters the interface between these non-metallic inclusions and the metal base (matrix) mainly composed of Fe. Local corrosion occurs.
- the lubricant absorbs moisture from the atmosphere, it usually contains a certain amount of water.Therefore, there is no mixing of water into the lubricant from the outside, and corrosion is caused by the water originally contained in the lubricant. Reaction may occur.
- H (ads) indicates hydrogen atoms adsorbed on the surface of the bearing material
- H (abs) indicates hydrogen atoms absorbed inside the bearing material
- the cathode of the chemical reaction formula (1) is used. It is important to suppress the reaction.
- the hydrogen ion index pH of the lubricant and the composition of the lubricant (base oil, thickener, pH modifier) in the present embodiment will be described below.
- the hydrogen ion exponent pH can be increased by adding it to the agent, but the reaction rate of chemical reaction formula II is reduced to achieve sufficient suppression of hydrogen absorption into the raceway material.
- the hydrogen index pH of the lubricant is limited to 7 to 13.
- the base oil responsible for the lubricating action is not particularly limited, and any oil that is usually used as a base oil for a lubricating oil can be used, but a low temperature that may occur when low-temperature fluidity is insufficient.
- the kinematic viscosity at 40 ° C is 40 to 400 mm Vsec, preferably 60 to 25 to ensure the occurrence of abnormalities at start-up and the formation of a stronger oil film to secure seizure resistance. It is desirable to use a base oil of 0 mm V sec.
- mineral oil-based lubricants can be used as the base oil.
- synthetic oil-based lubricants can be used as the base oil.
- natural oil-based lubricants can be used as the base oil.
- Mineral oil-based lubricating oils are those obtained by appropriately combining mineral oils under reduced pressure distillation, oil removal, solvent extraction, hydrocracking, solvent dewaxing, sulfuric acid washing, white clay purification, hydrogenation purification, etc. Can be used.
- hydrocarbon-based oil hydrocarbon-based oil, aromatic-based oil, ester-based oil, ether-based oil and the like can be used.
- hydrocarbon-based oil examples include polyparaffins such as normal paraffin, isoparaffin, polybutene, polyisobutylene, 1—deceneoligoma, 1—decene, and ethylenoligoma. (PA ⁇ ), or a hydride thereof can be used.
- polyparaffins such as normal paraffin, isoparaffin, polybutene, polyisobutylene, 1—deceneoligoma, 1—decene, and ethylenoligoma. (PA ⁇ ), or a hydride thereof can be used.
- aromatic oil examples include alkylbenzene such as monoalkylbenzene and dialkylbenzene, and alkylnaphthalene such as monoalkylnaphthylene, dialkylnaphthalene, and polyalkylnaphthalene.
- ester oils include dibutyl sebaguet, di-2-ethylhexyl senogate, octyl adipate, diisodecyl adipate, ditridecyl adipate, ditridecyl glutarate, Diester oils such as methyl acetyl sinolate, aromatic ester oils such as trioctyl trimellitate, tridecyl trimellitate and tetra octyl bilomerate, or triester oils Polyester ester oils such as methyl propane caprilet, trimethylolpropane peralgonate, pendus erythritol-12-ethyl ethyl hexanoet, pendus erythritol peralgonite, and many more Alcohol and dibasic acid. Complex ester oils, which are oligoesters of mixed basic acids with fatty acids, can be used.
- ether-based oils include polyethylene glycol, polypropylene glycol, polyethylene glycol monoether, and polypropylene glycol such as polypropylene glycol monoether, and monoalkyl triphenyl ether and ⁇ -alkyl. Oils such as rutile diphenyl ether, dialkyl diphenyl ether (DAPE), pen diphenyl ether, tetraphenyl ether, monoalkyl tetraphenyl ether, dialkyl tetraphenyl ether, etc. Can be used.
- DAPE dialkyl diphenyl ether
- tricresyl phosphate silicone oil, perfluoroalkyl ether and the like
- silicone oil perfluoroalkyl ether
- perfluoroalkyl ether perfluoroalkyl ether
- a base oil a mixture prepared by mixing two or more lubricating oils to have a desired kinematic viscosity can also be used as a base oil. it can.
- the thickener is contained in the lubricant in order to keep the lubricant in a semi-solid state and to improve the properties (viscosity, elasticity, plasticity, etc.) of the oil.
- Molecules or crystals are linked in a chain to form a fiber, which is dispersed in base oil to form a gel structure.
- the thickener is not particularly limited as long as it has a holding ability to hold the base oil in the gel structure.
- metal stones composed of Li, Na, etc. It is possible to appropriately select and use metal experiments such as composite metal stones selected from i, Na, Ba, and Ca, or rare compounds such as diurea compounds and polyurea compounds. is there.
- the diurea compound is a compound obtained by reacting a diisocyanate with a monoamine under predetermined conditions, and is represented by the general formula (1). 0 0
- the hydrogen ion exponent pH of the lubricant It is added to make the range of ⁇ 13. And, as described above, since water dissolves a small amount of carbon dioxide contained in the atmosphere, the hydrogen ion index of the lubricant is often 7 or less, and therefore, the hydrogen ion exponent pH?
- an alkaline substance as a pH adjusting agent.
- the alkaline substance include an amide compound, an organic metal salt, and an organic acid metal salt. At least one selected from the group consisting of alkaline inorganic compounds can be used.
- any of the primary to tertiary amines represented by the general formulas (2) to (4) can be used.
- R 5 wherein R 4 to R 6 are an aliphatic hydrocarbon group, an alicyclic hydrocarbon group, an aromatic hydrocarbon group, or a derivative thereof having a carbon number C n of n 1 to 24.
- R 4 to R 6 may be the same group or different groups.
- Aliphatic hydrocarbon groups include methyl, ethyl, propyl, butyl, And octyl, octyl, dodecyl, tetradodecyl, octadecyl, eicosyl and the like.
- a typical example of the alicyclic hydrocarbon group is a cyclohexyl group.
- aromatic hydrocarbon group examples include a phenyl group, a methylphenyl group, and an ethylphenyl group.
- These derivatives include a polyoxyalkylene group, a polyoxyethylene group, a polyoxyethylene group and the like.
- alkaline inorganic compound examples include metals such as sodium hydroxide (NaOH), hydroxide hydroxide (KOH), and aluminum hydroxide (Al (OH)).
- NaOH sodium hydroxide
- KOH hydroxide hydroxide
- Al (OH) aluminum hydroxide
- additives such as gelling agents, antioxidants, extreme pressure agents, oily agents, inhibitors, metal deactivators, viscosity index improvers, etc., as needed to further enhance the performance as a lubricant It is also a preferred embodiment to include an additive in the lubricant.
- examples of the gelling agent include metal stone, benton, and silicic acid gel
- examples of the antioxidant include amine-based, phenol-based, and thio-based zinc dithiophosphates. is there.
- examples of extreme pressure agents include chlorinated, zeolite, phosphorus, zinc dithiophosphate, organic molybdenum, and the like
- oily agents include fatty acids, animal and vegetable oils, and the like.
- petroleum sulfonate, dinonylnaphthalene sulfonate, sorbitan ester and the like are used as fire retardants.
- sodium nitrite examples of the viscosity index improver include polymethacrylate, polyisobutylene, and polystyrene.
- additives can be used alone or in combination of two or more.
- the content of the additive is not particularly limited, but is usually adjusted so that the content in the lubricant is 20 wt% or less.
- the applicant of the present application also examined the separation characteristics of each bearing part when moisture was mixed into the lubricant.
- the time required for the rolling bearing to separate decreases, but the bearing component where separation occurs is generally
- the most common is fixed wheels, followed by rotating wheels and rolling elements, in which order the frequency of separation decreases.
- the reason why the frequency of occurrence of separation in the rolling elements is lower than the frequency of occurrence of separation in the orbital rings is that the amount of hydrogen absorbed by the rolling elements is smaller than that of the orbital rings. This can be considered.
- the rolling speed of a rolling bearing is much higher in a rolling element than in a raceway.Thus, even if a small gap is formed on the rolling surface of the rolling element, moisture that has entered the minute gap will have a centrifugal force. , Which suppresses the progress of the corrosion reaction and reduces the amount of hydrogen absorbed into the material.
- the rolling ratio of the rolling element from the structural material is greater than the processing ratio of the raceway from the structural material, and the non-metallic material existing on the rolling surface of the rolling element Inclusions are smaller than non-metallic inclusions on the raceway surface of the bearing ring. Therefore, in the rolling element, the interface between the non-metallic inclusion and the metal base is small and shallow, so that the progress of the hydrogen-generating corrosion reaction is suppressed, and the amount of hydrogen absorbed into the material is small.
- the separation frequency of the rotating wheels is lower than that of the fixed wheels for the following reasons. That is, in general, it is considered that the rotating wheel is less likely to absorb hydrogen and absorbs less hydrogen than the stationary wheel, and therefore, the frequency of occurrence of peeling is smaller than that of the fixed wheel, even if water enters the minute gaps formed in the raceway surface. available.
- the inner ring and the rotating shaft are fitted with a close fit, tensile stress always acts on the raceway surface of the rotating ring, so stress corrosion is promoted even when the inner ring is a rotating ring.
- the chemical reaction of the above chemical reaction formula (1) actively proceeds and the amount of hydrogen absorbed by the rotating wheel also increases, so that the frequency of separation increases.
- the frequency of separation of the rotating wheel is the same as the frequency of separation of the fixed wheel. Etc., or more than equivalent. It should be noted that when the inner ring is a fixed wheel and the inner ring and the rotating shaft are fitted together by interference fit, the amount of absorbed hydrogen is larger than when fitted by clearance fit. Needless to say.
- rolling we focused on the metal contact between the rolling surface of the rolling element and the raceway surface of the bearing ring, and determined the metal base side inside the gap formed at the interface between the metal base and the non-metallic compound. It is effective to change the corrosion mode from local corrosion to contact corrosion by using a metal base on the rolling surface of the rolling element as a force source.
- the metal substrate existing on the rolling surface of the rolling element (hereinafter referred to as “rolling surface metal substrate”) is more electrochemically more valuable than the metal substrate existing on the raceway surface of the bearing ring (hereinafter referred to as "track metal substrate"). Accordingly, the metal base side inside the gap can be used as an anode, and the metal base on the rolling surface can be used as a force source.
- the corrosion reaction is an oxygen-consuming corrosion reaction, which can suppress the absorption of hydrogen into the inside of the race and prevent the bearing life from being shortened due to hydrogen embrittlement.
- the carbide inside the gap is still a force source, but on the carbide, the chemical reaction formula (3) causing hydrogen embrittlement hardly progresses as described above, and mainly Since the reaction of chemical reaction formula (1) proceeds, there is no absorption of hydrogen into the orbit.
- the Ms point is determined by the chemical composition of the base steel, the concentration of surface carbon or nitrogen added by carburizing or carbonitriding, the metal structure before quenching, the quenching temperature, the quenching time, etc. .
- the higher the Mn content of the base steel the higher the concentration of residual austenite, and the higher the concentration of residual austenite that has already been carburized before quenching and has already been increased.
- the concentration of residual austenite increases.
- the smaller the particle size of the carbide the higher the quenching temperature, and the longer the quenching temperature holding time, the higher the concentration of the residual oxide.
- the residual austenite concentration becomes higher than when the shot peening is performed.
- the bearing material As described above, stainless steel (SUS440C) was used as the bearing material. It is technically difficult and economically disadvantageous to suppress the corrosion reaction by using a high-alloy steel such as that described above, so use low-alloy steel as the material steel for the bearing. Is preferred.
- the material steel of each bearing part the chemical composition is, for example, C: 0.10 to 1.10 wt%, Si: 0.75 wt% or less, and Mn: 1.
- the formation of the nonmetallic inclusion is required to prevent the corrosion. It is also preferable to suppress the oxygen content to form oxides, sulfides, and titanium compounds, which are constituents of nonmetallic inclusions, by 9 ppm or less, and the io content by 5 Oppm or less. It is also desirable to reduce the titanium content to 40 ppm or less. Furthermore, in order to obtain good adhesion between the non-metallic inclusions and the metal base and to avoid the generation of minute gaps at the interface, the final refining method of the receiving material must be ESR or VAR. It is desirable to do this.
- the lubricant contains an organic metal salt or an ashless dialkyldithiocarboxylic acid (ADTC) to contain a non-metal. A strong reaction film is formed in the minute gaps formed between the inclusions and the metal base, so that even if the hydrogen ion exponent pH is 7 or less, if it is 5 or more, rolling with a desired bearing life L Bearings can now be obtained.
- ADTC ashless dialkyldithiocarboxylic acid
- reaction film forming agent organic metal which is a feature of the second embodiment is described below. Salt or ADTC)) and the hydrogen ion exponent pH.
- organic metal salts have been used as additives for lubricants as extreme pressure agents and some antioxidants, etc.
- a reactive film By containing the organic metal salt in the lubricant, a strong reaction film composed of the organic metal salt is formed in the minute gaps formed between the non-metallic inclusions on the surface of the bearing material and the metal base. .
- metal-to-metal contact is prevented and the coefficient of friction is reduced, so that load resistance, seizure resistance, and wear resistance can be improved.
- a specific organic metal salt is contained in the lubricant, and the above-mentioned strong reaction film is formed in the minute gaps before the hydrogen-evolving type corrosion reaction occurs, so that the force represented by the chemical reaction formula (1) is obtained.
- the progress of the softening reaction is suppressed, or the diffusion of hydrogen atoms adsorbed on the surface of the bearing material into the bearing material is prevented, thereby avoiding the premature separation of the bearing material, and the bearing life L Can be improved.
- organic metal salt having such an effect examples include a dialkyldithiocarbamic acid (DTC) -based compound represented by the general formula (5) and a dialkyldithiocarbamate represented by the general formula (6).
- Acid (DTP) compounds can be used.
- n 2, 3, 4,
- M represents a metal type, and specifically, Sb, Bi, Sn, Ni, Te, Se, Fe, Cu, Mo, or Zn is used.
- R 7 and R 8 may be the same or different, and represent an alkyl group, a cycloalkyl group, an alkenyl group, an aryl group, an alkylaryl group, or an arylalkyl group. Show. Particularly preferred groups are 1,1,3,3—tetramethylbutyl, 1,1,3,3—tetramethylhexyl, 1,1,3—tri Methylhexyl group, 1,3-dimethylbutyl group, 1-methylbenzyldecane group, 1-methylhexyl group, 1-methylpentyl group, 2-ethylbutyl group, 2-ethylhexyl group, 2— Methylcyclohexyl group, 3—heptyl group, 4—methylcyclohexyl group, n-butyl group, isobutyl group, isopyl pill group, isoheptyl group, isopentyl group, pendecyl Group, eicosyl group, e
- organic zinc compounds represented by the general formulas (7) to (9) can also be used.
- R 9 and R ′ D are both hydrogen atoms, mercaptobenzothiazolyl zinc (general formula (7)), benzamidothiophenol zinc (general formula (8)) , And mercaptobenzimidazol zinc (general formula (9)) can be preferably used.
- zinc alkylxanthate represented by the general formula (10) can also be used.
- organometallic salts represented by the general formulas (5) to (10) can be used alone or in combination of two or more. However, the combination is not particularly limited. Absent. Further, the same function and effect as the above-mentioned organometallic salt can be obtained by using ADTC such as methylenebisdialkyldithiocarbamic acid represented by the general formula (11).
- the organometallic salt or ADTC has the effect of forming a reaction film in minute gaps to suppress the progress of the corrosion reaction.However, if the content is less than 0.1 wt%, it is possible to exhibit a sufficient effect. Can not.
- the upper limit of the content does not need to be particularly limited, the compound used as the reaction film-forming agent is relatively expensive, and excessive addition of the reaction film-forming agent is difficult to obtain. Reaction may be abnormally promoted, leading to corrosion and abnormal wear. Therefore, considering such a point, it is preferable to limit the content of the reaction film forming agent to 10 wt% or less.
- the addition amount of the reaction film forming agent is 0.1 to 10 vvt. Set to%. In addition, a more preferable range of the addition amount is 0.1 to 5 wt%.
- the hydrogen ion concentration of the lubricant is high, in other words, when the hydrogen ion index pH is low, the rate of formation of corrosion products is high, and as a result, the reaction film has very small pores. It is not formed sufficiently between them, and the absorption of hydrogen into the bearing material cannot be sufficiently suppressed. Therefore, it is necessary to suppress the hydrogen ion concentration by adding an alkaline pH adjuster.
- the lower limit of the hydrogen ion index pH is set to 5 to satisfy sufficient bearing reliability. did.
- the upper limit of the hydrogen odor index pH is set to 13 in order to avoid such a problem.
- the range of the hydrogen exponent pH is set to 5 to 3 in the second embodiment.
- the fine particles made of an inorganic compound having an average particle diameter of 2 m or less are contained in the lubricant at 0.01 to 3 wt%, so that the raceway surface and the rolling surface can be separated.
- the tangential force between the raceway surface and the rolling surface was reduced by improving the oil film formation between them.
- the generation of the minute gap itself is suppressed, and the durability of the rolling bearing can be improved.
- the lubricant base oil, thickener, and pH adjusting agent are the same as those in the first and second embodiments, and the fine particles made of an inorganic compound, which is a feature of the third embodiment.
- the hydrogen ion exponent pH will be described below.
- the fine particles made of an inorganic compound are uniformly dispersed in the lubricant and intervene in the oil film even if the oil film receives a large shear stress due to high-speed rotation or the oil film becomes thin during high-temperature rotation.
- the oil film is firmly held at the contact surface between the rolling surface and the raceway surface by the fine particles, avoiding metal contact and improving the seizure life of the bearing.
- the fine particles made of such an inorganic compound penetrate into the fibrous thickener, whereby the gel structure is further strengthened.
- an inorganic compound whose surface is modified to be lipophilic and among the above inorganic compounds, the inorganic compound itself is used. ⁇ Metal oxides and viscous minerals with the action of thickeners are even more preferred.
- the fine particles made of the inorganic compound are finer than the gel structure formed by the thickener, they penetrate into the fibrous thickener as described above, thereby further strengthening the gel structure of the thickener. In other words, it increases the ability to form an oil film or increases the damping effect of the lubricant, thereby contributing to the improvement of the bearing life L. I Therefore, as long as the production cost is not expensive, the smaller the particle size, the better, and if the average particle size is 1 m or less, good seizure resistance can be exhibited. Furthermore, considering the seizure life, it is desirable that the particle size be smaller than the oil film of the base oil. That is, the oil film of the base oil used for the rolling bearing is practically 0.2 m or less, and therefore, the particle diameter is preferably 0.2 / m or less.
- the particle system of the inorganic compound is limited to an average particle size of 2 m or less, preferably 0. 0 or less.
- the shape of the fine particles is preferably as close to spherical as possible. However, if the average particle size is 2 m or less, polyhedral such as cubic or rectangular parallelepiped or needle-shaped may be used.
- the addition of the fine particles made of an inorganic compound to the lubricant contributes to the improvement of the durability of the lubricating material.
- the addition amount is less than 0.001 wt%, the intended effect is sufficiently obtained.
- the addition amount exceeds 3 wt%, the number of particles of the inorganic compound increases, abrasion is accelerated, and the seizure resistance is adversely affected. Therefore, in the present embodiment, the addition amount of the fine particles made of an inorganic compound is limited to 0.001 to 3 wt%, preferably, to 0.05 to 3 wt%.
- the hydrogen ion concentration of the lubricant is high, in other words, when the hydrogen ion index PH is low, the rate of formation of corrosion products is high, and as a result, a strong oil film is not sufficiently formed in minute gaps. Hydrogen absorption inside the material cannot be sufficiently suppressed. Therefore, similarly to the second embodiment, it is necessary to suppress the hydrogen ion concentration.
- the lower limit of the hydrogen ion index pH is set to 5 in order to satisfy sufficient bearing reliability.
- the upper limit of the hydrogen odor index pH is set to 13 to avoid occurrence of such a problem.
- the range of the hydrogen ion exponent pH is set to 5 to i 3.
- the thickener is not particularly limited.
- a diurea compound containing an aromatic amine is used.
- aromatic diurea compound or a mixture of an aromatic diurea compound and a diurea compound containing no aromatic amine (hereinafter referred to as “non-aromatic diurea compound”).
- a thickener comprising a mixture with an aromatic diurea compound has a stronger gel structure and can improve the rolling fatigue life.
- the diurea compound can be obtained by reacting a diisocyanate with a monoamine under specified conditions, while the aromatic diurea compound is represented by the general formula (12) or (13).
- the non-aromatic diurea compound is represented by the general formula (14).
- specific examples thereof include toluoyl, xylyl, ⁇ -phenyl, t-butylphenyl, dodecylphenyl, benzyl, methylbenzyl and the like.
- a cycloalkyl group a methylcyclohexyl group, a dimethylcyclohexyl group, an ethylcyclohexyl group, a acetylcyclohexyl group, a propylcyclohexyl group, an isopropyl Cyclohexyl, 1-methyl-3-propylcyclohexyl, butylcyclohexyl, pentylcyclohexyl, pentylmethylcyclohexyl, hexylcyclohexyl, ethyl, butyl, octyl
- aromatic cyclic molar ratio Z of formula (I) As for the relationship between the aromatic Zokua Mi emissions residues R 14 and nonaromatic Zokua Mi emissions residues R 16, in the embodiment of the present invention, as the aromatic cyclic molar ratio Z of formula (I) defined The aromatic ring molar ratio Z is set to 0.5 to 0.95.
- the aromatic ring molar ratio Z is set in the range of 0.5 to 0.95, and for that purpose, the compounds represented by the general formulas (12) to (14) are used. Can be appropriately mixed.
- aromatic ring molar ratio Z is laid preferred is 0.6 5 to 0.8 5, nonaromatic Zokua Mi emissions remaining
- the aromatic ring molar ratio Z is preferably from 0.70 to 0.95.
- examples of the diurea compound represented by the general formula (12) include structural formulas (18) and (19).
- examples of the diurea compound represented by the general formula (13) include compounds represented by the structural formulas (21) to (23), and the diurea compound represented by the general formula (14).
- Examples of the rare compound include compounds represented by structural formulas (24 :) to (27).
- the present applicant used a high-carbon chromium bearing steel type 2 (SUJ2) as a bearing material and quenched and tempered (immersion quenching) to produce a bearing member. Then, a deep groove ball bearing with a contact rubber seal is assembled using the bearing material, and greases having different hydrogen ion exponents pH are sealed in an annular space defined by the rolling elements and the races, thereby producing an automobile engine. It was assembled into a testing machine as a pulley-side bearing for the alternative, and a durability life test was performed.
- the cage used was a plastic molded product.
- the inner ring was a rotating wheel and the outer ring was a fixed ring.
- the bearing specifications are as follows.
- Rolling element 6 3 Residual austenite concentration y R
- the residual austenite deviation 7 is obtained by subtracting the residual austenite concentration on the rolling surface of the rolling element from the residual austenite concentration on the raceway surface of the bearing ring. Incidentally, come and there is a difference in the residual austenite concentration between the inner ring and the outer ring, it calculates the deviation delta 7 R using the higher value of.
- Table 1 shows the specifications of the grease used in this endurance life test and the test results of the endurance life test.
- Jiurea compound A used as a thickener is Jiisoshiane preparative residue R 2 consists Jifue two Rumechi Le group 4, 4'—Diphenylmethane diisocyanate (MDI) and cyclohexylamine (CHA), in which the amide residues R 1 and R 3 are cyclohexyl groups, are in a molar ratio of 1: 2. It is made by blending it.
- the diurea compound B used as the thickener was obtained by mixing MDI with cyclohexylamine (CHA) and stearylamine. And (StA) were prepared in a molar ratio of 1: 1: 1.
- diisopropyl Soshiane preparative residue R 2 is Jifuwenirume butyl group
- R 1 is a cyclohexyl group sik b
- is ⁇ Mi emissions residues R 3 O pin definition dodecyl (steering Li Group).
- Examples 1 to 3 6 to 8 and Comparative Example 51, as the base oil, a poly- ⁇ -olefin ( ⁇ ⁇ ⁇ ) having a kinematic viscosity at 40 m of 48 mraVsec was used.
- a poly- ⁇ -olefin ( ⁇ ⁇ ⁇ ) having a kinematic viscosity at 40 m of 48 mraVsec was used.
- DAPE dialkyl diphenyl ether
- the method for producing grease is not particularly limited, but in this example, grease was produced as follows.
- a predetermined amount of MDI is added to the base oil and maintained at a predetermined temperature (70 to 80 ° C) required for the reaction, and a predetermined amount of stearylamine (StA) or Z and Z Chlohexylamine (CHA) was added for reaction, and the reaction product was heated to a temperature of 160 with stirring, and 0.5 wt% of 2,6 as an antioxidant was added.
- Add the —g-t-butyl-p-cresole derivative and then stir to cool to around room temperature (about 20 ° C).
- Example 1 As a pH adjusting agent, octylamine (0 cA) was used in Example 1, Comparative Examples 53 and 54, and stearylamine (StA) was used in Example 2.
- Example 3 uses Na 2 C 0, and Example 4 uses lithium carbonate (K 2 C 0 3 ). It was used. Furthermore, Examples 5 and 6 used lithium stearate (StLi), and Examples 7 and 8 used NaOH. In Comparative Examples 51 and 52, no pH adjusting agent was added.
- the admixture consistency in Table 1 is a value indicating the softness of the grease.
- the admixture consistency of the NLGI grade is set to No. 2 (265) so as to be suitable for receiving sealed grease. 2295) and No. 3 (220 to 250), and the mixing ratio of the base oil and the thickener was adjusted.
- test conditions for the durability life test are as follows.
- test load is the tension of the drive belt suspended on the pulley, and the tension of the drive belt is applied to the pulley. Further, the drive belt is configured to receive the applied load on the pulley-side bearing and the anti-pulley-side bearing. Is adjusted.
- the rotation speed of the rotating shaft is set to be the acceleration time for accelerating from 2000 rpm to 140 rpm and the deceleration time for deceleration from 140 rpm to 2000 rpm. In seconds, the operation was repeated between 2000 rpm and 14000 rpm.
- the life test was carried out by fabricating each of the bearings of Examples 1 to 8 and Comparative Examples 51 to 54 for each of the five bearings.
- the operating time of the first separated bearing was defined as the bearing life L, and the rated life of the bearing.
- the durability life of the bearing was evaluated in comparison with L10.
- the durability evaluation of the rolling bearing is at least the rated life L ,. Needs to be satisfied. In other words, it is used not only when water enters the lubricant from the outside but also when the moisture in the lubricant is greatly affected by vibrations and the like even if the water does not enter the inside of the bearing from the outside. If the rated life L,. Separation often occurs during the following operation times. Therefore, in the evaluation of durability, at least the time when separation occurs is at least the rated life L,. It is necessary to be above.
- the hydrogen index pH was in the range of 7 to 13 and the rated life of all the test pieces was L>. It can be seen that the above bearing life L can be obtained and the desired durability can be satisfied.
- Example 7 and Comparative Example 5 3, 5 4 residual ose Tenai as preparative deviation delta gamma R becomes delta ⁇ R rather 0, the concentration of residual Osutenai I 1 l vo l%
- Example 7 ′ and Comparative Example 5 4 ′ corresponding to Example 7 and Comparative Example 54 were performed. ⁇ All 5 bearings have a rated life L, respectively. No separation occurred even after passing.
- Comparative Example 5 3 which corresponds to the ratio Shiborei 5 3, although ⁇ even after rated life L 1 0 is one cry occurred for three, two remaining 1 One peeled off in 688 hours and the other peeled off in 640 hours.
- the applicant of the present invention prepared a plurality of types of grease in which an organometallic salt or ADTC was added and a hydrogen ion index pH was adjusted with a pH adjusting agent, and the first example was performed.
- the grease thus produced was sealed in a deep groove ball bearing and subjected to a durability life test.
- a poly- ⁇ -olefin ( ⁇ ⁇ ⁇ ) having a kinematic viscosity of 48 mmVsec at 40 ° C was used as the base oil, and the addition amount of the diurea compound as a thickener was 15 wt%. It was prepared as follows. In other words, MDI was added to PAO as a base oil. The solution is maintained at a predetermined temperature (70 to 80 ° C) required for the reaction, and then these cyclohexylamine (CHA) and octadecylamine are added at a mole ratio of 1 mole to 1 mole of MD11. Hexylamine (CHA) and octadecylamine were added to the solution and reacted.
- CHA cyclohexylamine
- octadecylamine Hexylamine
- octadecylamine were added to the solution and reacted.
- reaction mixture is heated to a temperature of 160 ° C. while stirring, and 0.5 wt% of a 2,6-di-t-butyl-p-cresol derivative as an antioxidant is added. Add, then let cool while stirring to around room temperature (about 20 ° C). Then, in the cooling step, 3 wt% of barium dinolylnaphthalenesulfonate as a heat-resistant agent previously dispersed or dissolved is added, and a predetermined pH adjusting agent and a predetermined organic metal salt or ADTC was added. Finally, the product cooled to near room temperature was ground with a roll mill to obtain grease.
- the above-mentioned grease was prepared so as to have a mixing consistency of NLGI grade No. 2 (265-295) so as to be suitable for use in receiving a sealed grease.
- the bearing specifications and the test conditions for the durability life test are the same as those in the first embodiment, and the method of measuring the hydrogen ion exponent pH is the same as that in the first embodiment.
- Table 2 shows the specifications of the grease subjected to this durability life test and the test results of the durability life test.
- pH-adjusting agents examples include octylamine (0 cA) in Examples 11; stearylamine (StA) in Examples 11 to 14; and octalamin (StA) in Examples 15 and 16.
- Nsan'na Application Benefits um (0 c N a)
- example 1 7 using carbonate mosquito re um K 2 C 0 3
- Comparative example 6 1, 6 2 was not added [rho Eta preparations .
- Example 11 used molybdenum dialkyldithio-potamidate (MoDTC) and Example 12 used nickel dialkyldithio-potassium (NiDTC).
- Example 13 used Mo DTC and molybdenum dialkyldithiophosphate (Mo DTP), and Example 14 used Mo DTC and zinc dialkyldithiolate (ZnDTP).
- Example 15 used dialkyldithiopotassium antimonate (SbDTC), Example 16 used bismuth dialkyldithiocarbamate (BiDTC), and Comparative Example 62 used Comparative Example 62. Tellurium dialkyldithiocarbamate (Te DTC) was used. In Example 17, ADTC was used.
- the hydrogen ion exponent pH was adjusted to 5.2 to 5.7 and all were adjusted to 5 or more, and 0 to 3.Owt% of the reaction film forming agent (Organic metal salt or ADTC) is added, and it can be seen that the rated life L of all test pieces can be 10 or more, and the desired durability can be satisfied.
- the reaction film forming agent Organic metal salt or ADTC
- the applicant of the present invention added 0 1 ⁇ % StA as a PH preparation agent to grease to adjust the hydrogen ion exponent pH to 5.1 to 5.3, while the reaction membrane Greases with different addition amounts of TeDTC as a forming agent were prepared, and the relationship between the addition amount of the reaction film forming agent and the bearing separation (bearing life L) was examined.
- FIG. 1 is a characteristic diagram showing the relationship between TeDTC as a reaction film-forming agent and the release of sulfur, and the number of test pieces subjected to the durability test is four.
- the rated life L of the test piece starts from the point when the amount of addition exceeds 0.07 wt%. It can be seen that the effect of the addition amount of 0.1 wt% or more on the sulfur receiving life L is sufficient.
- FIG. 2 is a characteristic diagram showing the relationship between the hydrogen ion exponent pH of grease and the desorption from grease, and four test pieces were subjected to the durability test.
- the applicant of the present application added a plurality of types of greases having fine particles made of an inorganic compound having an average particle diameter of 2 m or less and having a hydrogen ion exponent pH adjusted by a pH adjusting agent.
- the grease thus obtained was sealed in a deep groove ball bearing, and a durability life test was performed.
- Table 3 shows the specifications of the grease subjected to this durability life test and the test results of the durability life test.
- the thickener used was diurea compound A or didurea compound B, as in the first example, and the base oil used was PAO or DAPE, similarly to the first example. .
- the base oil and the thickener are added and reacted, and the reaction product is heated to 160 with stirring, and furthermore, an antioxidant is added and sufficiently stirred, and the cooling process is carried out by using the antioxidant or the like.
- a predetermined pH adjuster and a predetermined amount of a metal oxide as an inorganic compound having an average particle diameter of 2 ⁇ m or less are added, and after cooling to around room temperature, the product is ground with a roll mill to obtain a grease. Was.
- Example 21 As the pH adjusting agent, K 2 C 0 was used in Example 21 and Comparative Example 72, 0 c ⁇ ⁇ was used in Example 22 and Example 26, and S 2 was used in Example 25. t A was used. In Example 23 and Comparative Example 73, sodium stearate (St Na) was used, and in Example 24, sodium octoate (OcNa) was used. did.
- the above greases are suitable for sealed bearings and have a blending consistency of NLGI grade No. 2 (265-295) or No. 3 (220-250). It was prepared as follows.
- bearing specifications and the test conditions for the durability life test are the same as those in the first embodiment, and the method of measuring the hydrogen ion exponent pH is also the same as in the first embodiment, and therefore, the description is omitted.
- the number of test pieces in each example and comparative example is four.
- the applicant of the present application added a diurea compound containing an aromatic amine as a thickening agent and prepared a hydrogen ion index pH using a pH adjusting agent.
- a kind of grease was produced, and the produced grease was sealed in a deep groove ball bearing, and a durability life test and a grease leakage test were performed.
- Table 4 shows the specifications of the grease produced in the fourth embodiment.
- Jiisoshiane Bokuzanmoto R 15 consists Bok Lil groups Application Benefits range iso Xia Natick preparative (TDI) or Jifue two Rumechiru group or Ranaru MD I .
- aromatic ⁇ Mi emissions residues R 14 uses Aniri emissions consisting of p- toluidine or phenyl groups consisting preparative drill group (R 14 component), a non-aromatic residue R 16 is a cyclohexyl group consequent opening consisting cyclohex Kishiruami emissions (C HA) or using Suteariruami emissions consisting of linear alkyl groups (S t a) or Okuchirua Mi emissions (0 c a) (R 16 component).
- C HA cyclohex Kishiruami emissions
- S t a Suteariruami emissions consisting of linear alkyl groups
- Okuchirua Mi emissions (0 c a)
- DAPE DAPE
- PAO diester
- polyolester DAPE
- mineral oil DAPE, PAO, diester, polyolester and mineral oil
- the aromatic amine residue R is adjusted so that the aromatic ring molar ratio Z becomes the predetermined ratio.
- a predetermined amount of a compound containing 14 and a non-aromatic amine residue R16 is added and reacted, and the reaction product is heated to a temperature of 160 ° C while stirring, and oxidation is prevented. Add the agent and then let it cool while stirring to around room temperature (about 20 ° C). Then, in the cooling step, a promotional agent and a predetermined pH adjusting agent were added. Finally, the product cooled to around room temperature was ground with a roll mill to obtain grease.
- the grease was prepared by mixing the ratio of the base oil and the thickener so that the mixing consistency was about 200 to 300.
- Table 5 shows the hydrogen ion exponent pH of the above grease and the results of a durability life test and a grease leakage test. Table 5 Life test results of bearing grease
- the method of measuring the hydrogen ion exponent pH, the specifications of the bearing, and the test conditions of the durability life test are the same as those of the first to third examples, and there are four test pieces in each example and comparative example. .
- Examples 31 to 41 a diurea compound containing an aromatic amine was added to a lubricant as a thickener, and the hydrogen ion exponent pH was 5.1 to 8.1. Since both 0 and 5 are adjusted to 5 or more, it can be seen that the rated life of all the test specimens can be obtained, and the ⁇ life expectancy L of 10 or more can be obtained, and the desired durability can be satisfied.
- the grease leakage test is performed under the following conditions with grease sealed in a deep groove ball bearing with a contact rubber seal.The amount of grease leaked by the end of the test is measured. Less than 0 wt% was determined to be acceptable. In addition, each test piece is addressed to four pieces.
- Examples 40 and 41 are the grease hydrogen ion fingers.
- the bearing life L was satisfactory since the number pH was 5 or more, but the grease softened at high temperatures because the aromatic ring molar ratio Z was as low as 0.30 or 0.40.
- the leakage amount exceeds 10 ⁇ %.
- FIG. 3 is a characteristic diagram showing a relationship between the addition amount (wt%) of the diurea compound and the aromatic ring molar ratio Z.
- the addition amount is less than 8 wt%, the gelling ability is insufficient, so that sufficient hardness cannot be obtained and grease may leak at high temperatures.On the other hand, if the addition amount exceeds 35 wt%, the temperature becomes high. ⁇ The durability at high speed may be deteriorated. If the aromatic ring molar ratio Z is less than 0.5 as described above, the grease may easily leak to the outside of the bearing, and sufficient leakage resistance may not be obtained. If the ratio Z exceeds 0.95, the fluidity of the grease is reduced, and there is a possibility that seizure damage may occur early.
- the addition amount shown in the region A is 8 to 35 wt% and the aromatic ring molar ratio Z is 0.5 to 0.95.
- Kishiruami emissions (CHA) cyclohexane as a measurement result from R 16 components in Table 4 lay preferred is 0.6 5 to 0.8 5 aromatic rings molar ratio Z is indicated by realm B , stearyl Mi in as the R 16 component (S t a) Ya Okuchiruami down (0 c a) 0. the case of using a straight chain alkyl group shown by the aromatic ring molar ratio Z is the region B, etc. 7
- the range of 0 to 0.95 is preferable, and the more preferable range of the addition amount of the diurea compound is 17 to 33 wt%.
- a rolling bearing according to the present invention includes: a track ring including an outer ring and an inner ring; and a rolling element rotatably disposed between the outer ring and the inner ring.
- a hydrogen ion exponent pH of the lubricant is set to 7 to 13. Therefore, even in the case of bearings for electrical components and accessories for automobile engines that are susceptible to the influence of moisture in the lubricant due to vibration or vibration, the separation of the bearing parts may occur. Can be prevented, and the durability can be improved.
- the hydrogen ion index pH is in the range of 5 to 13 as described above.
- the hydrogen index pH is within the range of 5 to 13. The same effect as described above can be obtained.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Rolling Contact Bearings (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19881083T DE19881083T1 (de) | 1997-07-02 | 1998-06-26 | Wälzlager |
GB9904560A GB2332683B (en) | 1997-07-02 | 1998-06-26 | Roller bearing with lubricant |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19076197 | 1997-07-02 | ||
JP9/190761 | 1997-07-02 | ||
JP28425897A JP3969503B2 (ja) | 1997-07-02 | 1997-10-02 | 転がり軸受 |
JP9/284258 | 1997-10-02 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09254172 A-371-Of-International | 1999-03-02 | ||
US10/091,394 Continuation US20030040442A1 (en) | 1997-07-02 | 2002-03-07 | Rolling bearing |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999001527A1 true WO1999001527A1 (fr) | 1999-01-14 |
Family
ID=26506291
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1998/002891 WO1999001527A1 (fr) | 1997-07-02 | 1998-06-26 | Palier rotatif |
Country Status (4)
Country | Link |
---|---|
JP (1) | JP3969503B2 (ja) |
DE (1) | DE19881083T1 (ja) |
GB (1) | GB2332683B (ja) |
WO (1) | WO1999001527A1 (ja) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000047700A1 (fr) * | 1999-02-12 | 2000-08-17 | Nsk Ltd. | Dispositif de roulement |
JP4888401B2 (ja) * | 2000-10-19 | 2012-02-29 | 日本精工株式会社 | 転がり軸受 |
JP2002195277A (ja) | 2000-10-19 | 2002-07-10 | Nsk Ltd | 転がり軸受 |
US6652149B2 (en) | 2001-02-20 | 2003-11-25 | Nsk Ltd. | Rolling bearing |
JP2002349681A (ja) * | 2001-05-23 | 2002-12-04 | Harmonic Drive Syst Ind Co Ltd | 波動歯車装置の潤滑機構 |
JP4730432B2 (ja) * | 2001-07-17 | 2011-07-20 | 日本精工株式会社 | 転がり軸受 |
US7196042B2 (en) | 2002-03-07 | 2007-03-27 | Nsk Ltd. | Grease composition and rolling apparatus |
JP2006016441A (ja) * | 2004-06-30 | 2006-01-19 | Nsk Ltd | グリース組成物及び転がり軸受 |
CN115536554B (zh) * | 2022-08-08 | 2024-04-26 | 青海师范大学 | 一种1,1′-(1,4-亚苯基)双(3-苯基脲)/苯胺缓蚀剂及其制备方法和应用 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02232297A (ja) * | 1989-03-04 | 1990-09-14 | Nippon Oil Co Ltd | グリース組成物 |
JPH0328299A (ja) * | 1989-06-27 | 1991-02-06 | Kyodo Yushi Kk | ウレアグリース組成物 |
-
1997
- 1997-10-02 JP JP28425897A patent/JP3969503B2/ja not_active Expired - Fee Related
-
1998
- 1998-06-26 DE DE19881083T patent/DE19881083T1/de not_active Withdrawn
- 1998-06-26 GB GB9904560A patent/GB2332683B/en not_active Expired - Fee Related
- 1998-06-26 WO PCT/JP1998/002891 patent/WO1999001527A1/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02232297A (ja) * | 1989-03-04 | 1990-09-14 | Nippon Oil Co Ltd | グリース組成物 |
JPH0328299A (ja) * | 1989-06-27 | 1991-02-06 | Kyodo Yushi Kk | ウレアグリース組成物 |
Also Published As
Publication number | Publication date |
---|---|
GB9904560D0 (en) | 1999-04-21 |
JP3969503B2 (ja) | 2007-09-05 |
GB2332683A (en) | 1999-06-30 |
GB2332683B (en) | 2001-10-24 |
JPH1172120A (ja) | 1999-03-16 |
DE19881083T1 (de) | 1999-07-15 |
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