WO2014088006A1 - 転動装置 - Google Patents
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- WO2014088006A1 WO2014088006A1 PCT/JP2013/082496 JP2013082496W WO2014088006A1 WO 2014088006 A1 WO2014088006 A1 WO 2014088006A1 JP 2013082496 W JP2013082496 W JP 2013082496W WO 2014088006 A1 WO2014088006 A1 WO 2014088006A1
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- yield stress
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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
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
- C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
- C10M105/18—Ethers, e.g. epoxides
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- 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
- C10M117/00—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof
- C10M117/02—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof having only one carboxyl group bound to an acyclic carbon atom, cycloaliphatic carbon atom or hydrogen
- C10M117/04—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof having only one carboxyl group bound to an acyclic carbon atom, cycloaliphatic carbon atom or hydrogen containing hydroxy groups
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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
- C10M169/02—Mixtures of base-materials and thickeners
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/121—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms
- C10M2207/1216—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms used as thickening agent
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/121—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms
- C10M2207/124—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms containing hydroxy groups; Ethers thereof
- C10M2207/1245—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms containing hydroxy groups; Ethers thereof used as thickening agent
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/1256—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids used as thickening agent
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/128—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof
- C10M2207/1285—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof used as thickening agents
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/283—Esters of polyhydroxy compounds
- C10M2207/2835—Esters of polyhydroxy compounds used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2010/00—Metal present as such or in compounds
- C10N2010/02—Groups 1 or 11
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/02—Viscosity; Viscosity index
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/68—Shear stability
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/76—Reduction of noise, shudder, or vibrations
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/02—Bearings
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/10—Semi-solids; greasy
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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
- 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
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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
- F16C2210/00—Fluids
- F16C2210/02—Fluids defined by their properties
- F16C2210/04—Fluids defined by their properties by viscosity
Definitions
- the present invention relates to a rolling device, and particularly aims to reduce torque and improve acoustic life.
- ⁇ Home appliance motors represented by air-conditioner fan motors support the rotating shaft with rolling bearings, which require low torque.
- As means for reducing the torque lowering the kinematic viscosity of the base oil or setting the consistency to a small value is performed.
- the base oil viscosity is too low, it is difficult to form an oil film on the rolling contact surface, and the lubrication performance is lost or the heat resistance is lowered, resulting in poor durability.
- lithium soap grease for example, see Patent Document 1 in which lithium soap is blended with low viscosity ester oil, or urea grease composition in which a urea compound is blended with synthetic hydrocarbon oil ( For example, see Patent Document 2).
- Patent Document 1 lithium soap grease
- Patent Document 2 urea grease composition in which a urea compound is blended with synthetic hydrocarbon oil
- the lithium soap-based grease has good acoustic characteristics, the heat resistance is not sufficient and there is a problem in durability at high temperatures.
- urea-based greases are excellent in high-temperature durability, but are inferior in acoustic characteristics as compared with lithium soap-based greases, and are difficult to use in places where quietness is required.
- the present invention has been made in view of such a situation, and aims to provide a rolling device that can reduce torque and improve the acoustic life, can maintain the quietness for a long period of time, and is suitable for home appliance motors. Objective.
- the present invention provides the following rolling device.
- a rolling device in which the grease composition is enclosed contains a mixture of a base oil having a kinematic viscosity at 40 ° C. of 15 to 80 mm 2 / s, lithium 12-hydroxystearate as a thickener, and fatty acid lithium having 6 to 12 carbon atoms, A rolling device having a dropping point of 190 to 240 ° C.
- the radius of curvature of the groove of the inner ring raceway is 51 to 56% with respect to the outer diameter of the rolling element, and the radius of curvature of the groove of the outer ring raceway is 55 to 63%.
- the rolling device according to the description (3) The rolling device according to (1) or (2), wherein the base oil is an ester oil.
- the lithium soap used for the thickener has fine fibers and excellent acoustic characteristics. Moreover, since the base oil viscosity is low, the torque is low. Furthermore, since the yield stress is high, the softening of the grease can be suppressed and leakage can be prevented, and the durability can be improved. Further, since the stirring resistance is reduced, the torque is reduced. Further, the heat resistance is further improved by using a mixture of 12-hydroxy lithium stearate and fatty acid lithium having 6 to 12 carbon atoms as a thickener.
- ester oil when used as the base oil, compatibility with the thickening agent lithium soap increases, and a strong network structure is formed, resulting in excellent shear stability and prevention of grease softening.
- FIG. 1 An example of a rolling device is the rolling bearing shown in FIG.
- the illustrated rolling bearing holds an inner ring 1 having an inner ring raceway 1a on an outer peripheral surface, an outer ring 2 having an outer ring raceway 2a on an inner peripheral surface, and a plurality of rolling elements 3 between the inner ring raceway 1a and the outer ring raceway 2a. It is held by a container 4 so as to be able to roll, and is further filled with a grease composition G for lubrication and sealed with a seal 5.
- the radius of curvature of the groove of the inner ring raceway 1a is preferably 51 to 56% with respect to the outer diameter of the rolling element 3, and the radius of curvature of the groove of the outer ring raceway 2a is larger than the outer diameter of the rolling element 3. It is preferably 55 to 63%.
- the radius of curvature of the groove of the inner ring raceway 1a is 53 to 56%, and the radius of curvature of the groove of the outer ring raceway 2a is 56 to 63%.
- a base oil having a kinematic viscosity at 40 ° C. of 15 to 80 mm 2 / s is used in the grease composition G.
- a base oil viscosity By using such a base oil viscosity, torque can be reduced.
- ester oil is preferable because it is excellent in affinity with the thickening agent lithium soap and can form a strong network structure. By strengthening the network structure, it becomes excellent in shear stability and softening of the grease composition can be suppressed. Moreover, ester oil is excellent also in heat resistance.
- the ester oil is not limited, but is obtained from the reaction of an aromatic tribasic acid or aromatic tetrabasic acid with a branched alcohol and a monobasic acid with a polyhydric alcohol.
- Preferred examples include polyol ester oils.
- aromatic ester oil pyromellitic acid ester oil, trimesic acid ester oil, specifically trioctyl trimellitate as ester oil obtained from the reaction of aromatic tribasic acid and branched alcohol.
- tridecyl trimellitate pyromellitic ester oil obtained from a reaction of an aromatic tetrabasic acid and a branched alcohol, specifically tetraoctyl pyromellitate, and the like.
- examples of the polyol ester oil include those obtained by reacting polyhydric alcohols and monobasic acids shown below in appropriate combinations.
- a monobasic acid may be individual and multiple may be used.
- examples of the polyhydric alcohol include trimethylolpropane, pentaerythritol, dipentaerythritol, neopentyl glycol, 2-methyl-2-propyl-1,3-propanediol and the like.
- monobasic acids are mainly monohydric fatty acids having 4 to 16 carbon atoms, specifically, butyric acid, valeric acid, caproic acid, caprylic acid, enanthic acid, pelargonic acid, capric acid, undecanoic acid.
- Lauric acid, mysteric acid, palmitic acid, beef tallow fatty acid, stearic acid, caproleic acid, palmitoleic acid, petrothelic acid, oleic acid, elaidic acid, asclepic acid, vaccenic acid, sorbic acid, linoleic acid, linoic acid, abinic acid, ricinol An acid etc. are mentioned.
- the thickener As the thickener, a mixture of 12-hydroxylithium stearate and lithium fatty acid having 6 to 12 carbon atoms is used because of its fine fibers and excellent acoustic characteristics. By using a mixture of lithium 12-hydroxystearate and a fatty acid lithium having 6 to 12 carbon atoms, the heat resistance is improved as compared with the case where lithium 12-hydroxystearate is used alone, and the acoustic characteristics are also improved. However, when mixed with a fatty acid lithium having 13 or more carbon atoms, the thickener is not firmly formed, so that the shear stability is deteriorated and the acoustic life is also reduced.
- the dropping point of the grease composition G is 190 to 240 ° C. If the dropping point is less than 190 ° C., the softening temperature is too low to obtain the required heat resistance. On the other hand, when the dropping point exceeds 240 ° C., the thickener is hardly formed uniformly, and the initial acoustic characteristics are deteriorated. Considering the acoustic lifetime, the preferred dropping point is 200 to 240 ° C.
- the yield stress of the grease composition G is 1.2 to 5 kPa.
- the grease composition is removed from the transfer surface due to shearing. However, if the yield stress is high, the grease composition tends to stay in a stable position after being excluded, and reflow into the excluded portion is suppressed.
- the grease composition tends to soften due to severe shearing under high surface pressure and high shear, and the softened grease composition flows inside the bearing and increases the agitation resistance. It becomes torque.
- the softened grease composition easily leaks from the bearing and loses its lubricating ability at an early stage, so that the durability is also lowered.
- the yield stress is increased to 1.2 kPa or more to suppress the softening of the grease composition, the torque is reduced, and the durability is improved.
- the higher the yield stress the lower the fluidity.
- a preferred yield stress is 2 to 4 kPa.
- the kinematic viscosity and type of the base oil, the type and content of the thickener, kneading at the time of production, etc. can be adjusted.
- the yield stress can be adjusted by the content of the thickener, kneading at the time of production, and the like.
- Examples 1 to 11 and Comparative Examples 1 to 12 A general single row deep groove ball bearing “608” (inner diameter: 8 mm, outer diameter: 22 mm, width: 7 mm) is prepared as a fan motor bearing, and the curvature of the grooves of the inner ring raceway and outer ring raceway is changed as shown in Table 1. Bearings A to C were produced.
- a grease composition was prepared with the composition shown in Table 2. At that time, the amount of thickener and kneading were adjusted so that the indicated dropping point and yield stress were obtained. The grease composition was subjected to (1) yield stress measurement, (2) drop point measurement, and (3) shear stability test. Each grease composition was enclosed in bearings A to C to prepare test bearings, which were subjected to (4) initial acoustic test, (5) bearing torque test, and (6) acoustic durability test.
- Comparative Example 1 uses lithium 12-hydroxystearate, and the yield stress is lower than the specified value.
- Example 4 lithium decanoate was used instead of lithium hexanoate to change the yield stress of the grease, but the acoustic life was long and the yield stress was high, so the torque was low. Moreover, although Example 7 uses lithium dodecanoate, since the acoustic life is long and the yield stress is also high in this case, the torque is reduced.
- the fatty acid lithium preferably has 6 to 12 carbon atoms.
- Comparative Example 2 uses a mixture of lithium 12-hydroxystearate and lithium hexanoate as a thickener, but the proportion of lithium hexanoate is increased to 90% by mass. As a result, the dropping point is very high, the solubility of the thickener during production is poor, the torque is larger than in Examples 1 to 3, and the acoustic life is shortened. Therefore, the proportion of the fatty acid lithium having 6 to 12 carbon atoms is preferably 75% by mass or less as in the examples.
- the dropping point is 260 ° C.
- the dropping point is in the range of 190 to 240 ° C., so that the dropping point is 190 to 240 ° C.
- Comparative Example 5 is a case where a urea compound is used as a thickener.
- the yield stress is high and the shear stability is excellent, the shear stability is too good and the supply of grease to the transfer surface is insufficient.
- the urea compound has thicker fibers than lithium soap, and the urea compound tends to be entangled into a large lump. Therefore, the resistance when a ball steps on a large mass of urea compound becomes very large, and the torque increases. Therefore, lithium soap is preferable as the thickener.
- Comparative Example 6 is a case where a grease composition having a yield stress smaller than a specified value was used. Moreover, although the comparative example 12 is the same composition as Example 4, since manufacturing conditions differ, the yield stress is smaller than a regulation value, Therefore The torque ratio is large. When the yield stress is small, the grease composition repelled from the raceway surface frequently re-inflows, resulting in high torque. On the other hand, Comparative Example 7 is a case where a grease composition having a yield stress larger than a specified value is used. However, since the grease composition does not move, the grease composition is not supplied to the raceway surface and the acoustic life is increased. Becomes shorter. Therefore, it can be said that the yield stress is 1.2 to 5 kPa as in the example.
- Comparative Example 8 is a case where a grease composition using PAO as the base oil was used. Since PAO and lithium soap are not compatible with each other, fine thickener fibers are not formed, the acoustic life is deteriorated, and the grease is hard to be hardened, so that the yield stress is lowered and the torque is increased. Moreover, although the mineral oil is used for the base oil in the comparative example 9, since the heat resistance of oil is not good, the acoustic life is shortened, and furthermore, the yield stress is low and the torque is high. Therefore, it can be said that an ester oil having good compatibility with lithium soap is preferable as the base oil as in the examples.
- the kinematic viscosity of the ester oil is changed. However, if the base oil viscosity is within this range, the torque can be reduced by increasing the yield stress, and the acoustic life is also increased. On the other hand, in Comparative Example 10, the kinematic viscosity of the ester oil is lower than the specified value. However, when the base oil viscosity is low, an oil film is hardly formed on the transfer surface, and metal contact is likely to occur. Moreover, since the evaporation amount of the base oil increases, the initial state cannot be maintained, and the acoustic life is reached early. In Comparative Example 11, the kinematic viscosity of the ester oil is higher than the specified value.
- the base oil viscosity is high, an oil film is easily formed on the contact surface and metal contact can be prevented. Then, viscous resistance becomes very large. From these facts, it can be said that the kinematic viscosity of the base oil is in the range of 15 to 80 mm 2 / s (40 ° C.).
- the relationship between the yield stress and the torque ratio is shown in FIG. 2, and the relationship between the yield stress and the acoustic life ratio is shown as a graph in FIG.
- FIG. 2 when the yield stress of the grease composition is increased, the torque tends to be low, and when the yield stress is less than 1.2 kPa, plastic deformation is likely to occur when subjected to shearing, and the internal stress of the bearing is reduced. Agitation increases and torque increases. Also from FIG. 3, if the yield stress is too small, the grease composition cannot remain around the raceway surface, and the lubrication capability is lost early and the acoustic life is shortened.
- the yield stress is too high, the grease composition does not move, and the grease composition is not supplied to the raceway surface, so that the acoustic life is shortened. Therefore, by setting the yield stress of the grease composition to 1.2 to 5 kPa, the torque ratio and the acoustic life ratio can be satisfied in a well-balanced manner, and it is particularly good in the range of 2 to 4 kPa.
- the rolling device of the present invention is suitable for various motors, and can reduce torque and improve acoustic life.
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Abstract
Description
(1)外周面に内輪軌道を有する内輪と、内周面に外輪軌道を有する外輪と、前記内輪軌道と前記外輪軌道との間に転動自在に設けられた複数の転動体と、保持器とを備え、グリース組成物が封入された転動装置において、
前記グリース組成物が、40℃における動粘度が15~80mm2/sの基油と、増ちょう剤として12-ヒドロキシステアリン酸リチウムと、炭素数6~12の脂肪酸リチウムとの混合物を含有し、かつ、滴点が190~240℃で、降伏応力が1.2~5kPaであることを特徴とする転動装置。
(2)前記転動体の外径に対して、前記内輪軌道の溝の曲率半径が51~56%であり、前記外輪軌道の溝の曲率半径が55~63%であることを特徴とする上記(1)記載の転動装置。
(3)前記基油が、エステル油であることを特徴とする上記(1)または(2)記載の転動装置。
ファンモータ用軸受として一般的な単列深溝玉軸受「608」(内径8mm、外径22mm、幅7mm)を用意し、その内輪軌道及び外輪軌道の溝の曲率を表1に示すように変えて軸受A~Cを作製した。
レオメーター(VAR型粘弾性測定装置、REOLOGICA社製)を用い、グリース組成物の降伏応力を測定した。測定は、パラレルプレートを用い、グリースのギャップは0.1mmとして下記の条件で行った。また、降伏応力の値としては、損失正接tanθ(=G’’/G’)が1を超えるときのせん断応力値を用いた。結果を表2に併記する。
(測定条件)
・測定モード:オシレーションモード
・試験温度:30℃
・周波数:10Hz
・せん断応力:10~5000Pa
JIS K 2220に従い、グリース中の増ちょう剤が基油に溶ける温度である滴点を測定した。結果を表2に併記する。
ASTM D 1831で規定されるシェルロール試験機を用い、下記の条件でせん断を与え、試験前後でのちょう度の変化量を求めた。結果を表2に、比較例1に対する相対値で示す。
(測定条件)
・グリース量:50g
・試験温度:25℃
・回転数:165min-1
・試験時間:2時間
日本国特開昭49-29886号公報に記載の方法に基づき、グリースノイズテスターを用いてグリース組成物の初期音特性を測定した。即ち、試験軸受(グリース封入量:160mg)について、回転開始30秒までのグリースノイズカウントを求めた。試験条件は、回転数1800min-1、荷重Fa=29.4N、M&H20、ディレータイム0.6秒、カウントレベル10で行った。結果を表2に併記する。
試験軸受(グリース封入量:160mg)を室温、内輪回転数1800min-1、アキシャル荷重29.4Nにて回転させ、60分後の回転トルクを測定した。結果を表2及び図2に、比較例1に対する相対値で示す。
試験軸受(グリース封入量:160mg)を120℃、内輪回転数1800min-1、アキシャル荷重29.4Nにて回転させ、アンデロン値が6に達するまでの時間を測定した。結果を表2及び図3に、比較例1に対する相対値で示す。
本出願は、2012年12月4日出願の日本特許出願(特願2012-265253)に基づくものであり、その内容はここに参照として取り込まれる。
1 内輪
2a 外輪軌道
2 外輪
3 転動体
4 保持器
5 シール
G グリース組成物
Claims (3)
- 外周面に内輪軌道を有する内輪と、内周面に外輪軌道を有する外輪と、前記内輪軌道と前記外輪軌道との間に転動自在に設けられた複数の転動体と、保持器とを備え、グリース組成物が封入された転動装置において、
前記グリース組成物が、40℃における動粘度が15~80mm2/sの基油と、増ちょう剤として12-ヒドロキシステアリン酸リチウムと、炭素数6~12の脂肪酸リチウムとの混合物を含有し、かつ、滴点が190~240℃で、降伏応力が1.2~5kPaであることを特徴とする転動装置。 - 前記転動体の外径に対して、前記内輪軌道の溝の曲率半径が51~56%であり、前記外輪軌道の溝の曲率半径が55~63%であることを特徴とする請求項1記載の転動装置。
- 前記基油が、エステル油であることを特徴とする請求項1または2記載の転動装置。
Priority Applications (4)
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US14/649,333 US20160201726A1 (en) | 2012-12-04 | 2013-12-03 | Rolling device |
CN201380062827.9A CN104822955A (zh) | 2012-12-04 | 2013-12-03 | 滚动装置 |
EP13859659.8A EP2930385A4 (en) | 2012-12-04 | 2013-12-03 | ROLLING DEVICE |
JP2014551108A JPWO2014088006A1 (ja) | 2012-12-04 | 2013-12-03 | 転動装置 |
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JP2012-265253 | 2012-12-04 | ||
JP2012265253 | 2012-12-04 |
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WO2014088006A1 true WO2014088006A1 (ja) | 2014-06-12 |
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EP (1) | EP2930385A4 (ja) |
JP (1) | JPWO2014088006A1 (ja) |
CN (1) | CN104822955A (ja) |
WO (1) | WO2014088006A1 (ja) |
Cited By (8)
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JP2017150615A (ja) * | 2016-02-26 | 2017-08-31 | ミネベアミツミ株式会社 | 転がり軸受 |
WO2018235611A1 (ja) * | 2017-06-23 | 2018-12-27 | Ntn株式会社 | グリースの評価方法、およびグリースの評価方法により評価されたグリース |
WO2021070887A1 (ja) * | 2019-10-10 | 2021-04-15 | Ntn株式会社 | グリース組成物および転がり玉軸受 |
WO2021070888A1 (ja) * | 2019-10-10 | 2021-04-15 | Ntn株式会社 | 車軸用軸受、グリース組成物、および転がり玉軸受 |
JP2021063521A (ja) * | 2019-10-10 | 2021-04-22 | Ntn株式会社 | 車軸用軸受 |
JP2021063154A (ja) * | 2019-10-10 | 2021-04-22 | Ntn株式会社 | グリース組成物および転がり玉軸受 |
JP2022035252A (ja) * | 2020-08-20 | 2022-03-04 | 住友電気工業株式会社 | ガイドローラ、光ファイバの製造方法 |
WO2023181407A1 (ja) * | 2022-03-25 | 2023-09-28 | 株式会社ジェイテクト | グリース |
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GB2565829B (en) * | 2017-08-24 | 2022-02-09 | Kenwood Ltd | Seal assembly for a kitchen appliance |
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CN104822955A (zh) | 2015-08-05 |
US20160201726A1 (en) | 2016-07-14 |
EP2930385A4 (en) | 2016-02-17 |
JPWO2014088006A1 (ja) | 2017-01-05 |
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