WO2024095825A1 - Dispositif de palier à roulement - Google Patents

Dispositif de palier à roulement Download PDF

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Publication number
WO2024095825A1
WO2024095825A1 PCT/JP2023/038311 JP2023038311W WO2024095825A1 WO 2024095825 A1 WO2024095825 A1 WO 2024095825A1 JP 2023038311 W JP2023038311 W JP 2023038311W WO 2024095825 A1 WO2024095825 A1 WO 2024095825A1
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Prior art keywords
oil
rolling bearing
lubricating oil
grease composition
bearing device
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PCT/JP2023/038311
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English (en)
Japanese (ja)
Inventor
一樹 園田
紘澄 葛谷
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Ntn株式会社
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Publication of WO2024095825A1 publication Critical patent/WO2024095825A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/02—Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation
    • 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
    • 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
    • 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
    • C10M129/68—Esters
    • 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
    • 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
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/16—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • 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
    • F16N—LUBRICATING
    • F16N7/00—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
    • F16N7/36—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated with feed by pumping action of the member to be lubricated or of a shaft of the machine; Centrifugal lubrication

Definitions

  • the present invention relates to a rolling bearing device having a rolling bearing and a lubricating oil supply mechanism, and in particular to a rolling bearing device used to support the spindle of a machine tool.
  • the main spindle of a machine tool is preferably one that rotates at high speed to increase machining efficiency, and various lubrication techniques are applied to its bearings.
  • Known lubrication methods suitable for a high-speed rotating spindle include, for example, air-oil lubrication and oil mist lubrication.
  • Grease lubrication is environmentally friendly as it does not require the air-oil supply device, which is ancillary equipment required for air-oil lubrication, or a structure for injecting air-oil into bearings, and it can reduce initial and operating costs.
  • Patent Document 1 shows a method of simultaneously using urea grease and a grease with good oil separating properties.
  • Patent Document 1 is relatively difficult to control, such as the arrangement of the two greases in the bearing space, and the amount and behavior of the base oil, and there is room for improvement in terms of reliability.
  • the rotational speed during the break-in is also in the high rotation range, making it easy for temporary temperature increases to occur during the break-in. If the temporary temperature increase is large, it is necessary to stop the break-in each time, and from the perspective of workability, it is desirable to suppress such temperature increases.
  • the present invention was made in consideration of these circumstances, and aims to provide a rolling bearing device that can ensure lubrication durability with grease lubrication even under high-speed rotation conditions, and can suppress temperature rise during break-in.
  • the rolling bearing device of the present invention comprises a rolling bearing having an inner ring, an outer ring, a plurality of rolling elements interposed between the inner ring and the outer ring, and a grease composition sealed in the bearing space between the inner ring and the outer ring, the grease composition containing a base oil having a kinetic viscosity of less than 120 mm2 /s at 40°C and a thickener consisting of a urea compound and having a worked penetration of 230 to 300 as measured in accordance with JIS K 2220, and a lubricating oil supply mechanism which supplies lubricating oil into the bearing space of the rolling bearing and supplies the lubricating oil to a raceway surface.
  • the base oil and the lubricating oil are each selected from the group consisting of synthetic hydrocarbon oils, ester oils, and mixed oils of synthetic hydrocarbon oils and ester oils.
  • the base oil and the lubricating oil each have a kinematic viscosity at 40° C. of 10 mm 2 /s to 50 mm 2 /s.
  • the grease composition is characterized by having a worked penetration of 250 to 280 as measured in accordance with JIS K 2220.
  • the urea compound is a diurea compound obtained by reacting a diisocyanate component with a monoamine component, and the monoamine component contains an aliphatic monoamine.
  • the base oil and the lubricating oil are each selected from the group consisting of a synthetic hydrocarbon oil, an ester oil, and a mixed oil of a synthetic hydrocarbon oil and an ester oil, the base oil and the lubricating oil both have a kinematic viscosity at 40°C of 10 mm 2 /s to 50 mm 2 /s, and the grease composition has a worked penetration of 250 to 280 as measured in accordance with JIS K 2220.
  • the lubricating oil supply mechanism is characterized by discharging lubricating oil toward the vicinity of the raceway surface of the inner ring.
  • the rolling bearing device of the present invention includes a rolling bearing in which the grease composition contains a base oil having a predetermined kinetic viscosity at 40°C and a thickener made of a urea compound, and has a mixed penetration of 230 to 300, and a lubricating oil supply mechanism that supplies lubricating oil to the bearing space of the rolling bearing and supplies the lubricating oil to the raceway surface. Therefore, by supplying lubricating oil while using urea grease, which is relatively advantageous in terms of lubrication durability, oil shortage on the raceway surface is prevented, and an oil film is easily formed even under high-speed rotation conditions.
  • the base oil and lubricating oil are each selected from the group consisting of a synthetic hydrocarbon oil, an ester oil, and a mixed oil of a synthetic hydrocarbon oil and an ester oil, and the base oil and lubricating oil both have a kinetic viscosity at 40°C of 10 mm 2 /s to 50 mm 2 /s, which makes it easy to eliminate aggregation of the thickener and to supply the lubricating oil to the raceway surface.
  • the grease composition has a worked penetration of 250 to 280, measured in accordance with JIS K 2220, making it easier to eliminate agglomerations of the thickener.
  • the urea compound is a diurea compound obtained by reacting a diisocyanate component with a monoamine component. Since the monoamine component contains an aliphatic monoamine, it is suitable for use under high-speed rotation conditions and is also advantageous in terms of eliminating the aggregation of the thickener.
  • the lubricating oil supply mechanism discharges lubricating oil near the raceway surface of the inner ring, so it can supply lubricating oil to the raceway surface while suppressing the effects of torque fluctuations caused by oil supply.
  • FIG. 1 is a schematic diagram showing an example of a rolling bearing device of the present invention.
  • FIG. 1 is a diagram showing an outline of calculation of the work of adhesion.
  • FIG. 2 shows an infrared spectrum trace of an ester oil.
  • FIG. 2 is a microscopic image of a grease composition.
  • the inventors of the present invention have conducted extensive research into grease lubrication, aiming to improve the durability of the lubrication under high-speed rotation conditions. As a result, they discovered that when urea grease is used, as the grease separates and the ratio of thickener in the grease increases, some of the grease aggregates due to the shear caused by the rotation of the bearing. They also discovered that supplying lubricating oil under such conditions resolves the oil shortage on the raceway surface and breaks down the thickener aggregates. The present invention is based on these findings.
  • a machine tool spindle includes a rotating shaft, a housing inner cylinder, a housing outer cylinder arranged on the outer periphery of the housing inner cylinder, and a bearing device that holds the rotating shaft rotatably relative to the housing inner cylinder.
  • the bearing device further has a rolling bearing.
  • the rolling bearing may be positioned by an inner ring spacer and an outer ring spacer that are respectively interposed on the inner ring side and the outer ring side.
  • the rolling bearing device 20 comprises an angular ball bearing 1 and a lubricating oil supply mechanism 11 that supplies lubricating oil into the bearing space of the angular ball bearing 1.
  • FIG. 1 shows the lubricating oil supply mechanism 11 in a functional block diagram.
  • an angular contact ball bearing 1 comprises an inner ring 2 having an inner ring raceway surface 2a on its outer peripheral surface, an outer ring 3 having an outer ring raceway surface 3a on its inner peripheral surface, a number of balls 4 interposed between the inner ring raceway surface 2a and the outer ring raceway surface 3a, and a retainer 5 that holds the balls 4 at regular intervals in the circumferential direction.
  • the inner ring 2 and outer ring 3 are in contact with the balls 4 at a predetermined angle ⁇ (contact angle) relative to the radial centerline, and can bear radial loads and unidirectional axial loads.
  • the retainer 5 is of an outer ring guide type, and is guided to the outer ring 3 by the outer ring guide surface 5a of the retainer 5 coming into contact with the inner peripheral surface of the outer ring 3.
  • the outer ring guide surface 5a is provided on a part of the outer peripheral surface of the retainer 5 (both axial ends).
  • a predetermined amount of grease composition 7 is sealed in the bearing space between the inner ring 2 and the outer ring 3.
  • a seal member 6 is attached to one axial end of the bearing space.
  • the inner ring 2 and the outer ring 3 are made of an iron-based metal material, and the grease composition 7 is interposed between the raceway surface with the balls 4 to lubricate them.
  • the lubricating oil supply mechanism 11 has a power supply unit 12, a control unit 13, a drive unit 14, a pump 15, and a tank 16.
  • the power supply unit 12 is connected to the control unit 13 and the drive unit 14 so as to be able to supply power to each of them.
  • the control unit 13 is, for example, a microcomputer, and is connected so as to be able to send commands to the drive unit 14.
  • the drive unit 14 is a drive circuit for operating the pump 15.
  • the pump 15 may be configured to suck up the lubricating oil in the tank 16 and discharge a predetermined amount of lubricating oil.
  • the pump 15 may be a pneumatic or hydraulically driven piston pump, a hydraulic pump such as a gear pump, a diaphragm pump, or the like.
  • the drive unit 14 Based on a command from the control unit 13, the drive unit 14 operates the pump 15, and lubricating oil is supplied to the bearing space through the nozzle 17.
  • the tip of the nozzle 17 extends into the bearing space.
  • the nozzle 17 ejects lubricating oil onto the outer peripheral surface of the inner ring 2. More specifically, the lubricating oil is ejected toward the vicinity of one side of the inner ring raceway surface 2a (the side opposite the shoulder portion 2b). In this case, the ejected lubricating oil moves to the inner ring raceway surface 2a by centrifugal force, resolving the oil shortage on that raceway surface.
  • the amount of oil supplied by the lubricating oil supply mechanism 11 each time is preferably an extremely small amount that does not affect the torque fluctuation of the bearing, for example, 0.001 mL to 0.1 mL.
  • the amount of oil supplied and the timing of oil supply may be controlled according to the lubrication state of the rolling bearing.
  • the lubrication state may be detected, for example, by a sensor installed inside or around the rolling bearing.
  • the initial grease composition that is pre-filled into the rolling bearing device of the present invention is a urea grease that contains a thickener made of a base oil and a urea compound.
  • the base oil used in the grease composition may be any of those commonly used in the field of greases.
  • mineral oils such as paraffinic mineral oil and naphthenic mineral oil, poly- ⁇ -olefin (PAO) oil, alkylbenzene oil, alkylnaphthalene oil, polyphenyl oil, synthetic naphthenic oil, polybutene oil and other synthetic hydrocarbon oils, ester oil, ether oil, silicone oil, fluorine oil, etc. These oils may be used alone or in combination of two or more.
  • the base oil is selected from the group consisting of synthetic hydrocarbon oils, ester oils, and mixed oils of synthetic hydrocarbon oils and ester oils, and it is more preferable that the base oil is a synthetic hydrocarbon oil or a mixed oil of synthetic hydrocarbon oils and ester oils.
  • PAO oil a synthetic hydrocarbon oil
  • PAO oil is a mixture of ⁇ -olefins or isomerized ⁇ -olefin oligomers or polymers.
  • ⁇ -olefins include 1-octene, 1-nonene, 1-decene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-nonadecene, 1-eicosene, 1-docosene, and 1-tetradocosene, and mixtures of these are usually used.
  • Ester oils are compounds that have an ester group in the molecule and are liquid at room temperature. Examples include diester oils such as dibutyl sebacate, di-2-ethylhexyl sebacate, and dioctyl adipate; aromatic ester oils such as trioctyl trimellitate, tridecyl trimellitate, and tetraoctyl pyromellitate; polyol ester oils such as trimethylolpropane caprylate, trimethylolpropane bellargonate, and pentaerythritol ester oil; carbonate ester oils, phosphate ester oils, and polymer ester oils.
  • diester oils such as dibutyl sebacate, di-2-ethylhexyl sebacate, and dioctyl adipate
  • aromatic ester oils such as trioctyl trimellitate, tridecyl trimellitate, and tetraoctyl pyromellitate
  • the base oil has a kinetic viscosity at 40°C (in the case of a mixed oil, the kinetic viscosity of the mixed oil, the same below) of less than 120 mm2 /s. This makes it possible to suppress stirring resistance, and for example, the extent of a temporary temperature rise during break-in can be suppressed.
  • the kinetic viscosity is preferably 10 mm2/s to 50 mm2/s, and more preferably 10 mm2/s to 40 mm2/s. By making the kinetic viscosity 10 mm2 /s or more, evaporation during operation can be easily prevented.
  • the thickener used in the grease composition is a urea compound obtained by reacting a polyisocyanate component with a monoamine component.
  • the polyisocyanate component include phenylene diisocyanate, tolylene diisocyanate, diphenyl diisocyanate, diphenylmethane diisocyanate, octadecane diisocyanate, decane diisocyanate, and hexane diisocyanate.
  • aromatic diisocyanates are more preferable.
  • polyisocyanates obtained by reacting a diamine (such as ethylene diamine or propane diamine) with a diisocyanate in excess of the diamine in terms of molar ratio can be used.
  • the monoamine component may be an aliphatic monoamine, an alicyclic monoamine, or an aromatic monoamine.
  • aliphatic monoamines include hexylamine, octylamine, dodecylamine, hexadecylamine, stearylamine, and oleylamine.
  • alicyclic monoamines include cyclohexylamine.
  • aromatic monoamines include aniline and p-toluidine.
  • an aliphatic monoamine as the monoamine component, and it is more preferable to use 50 mol% or more of an aliphatic monoamine based on the total amount of monoamines.
  • an aliphatic monoamine may be used as the monoamine component, or an aliphatic monoamine and an alicyclic monoamine may be used in combination, or an aliphatic monoamine and an aromatic monoamine may be used in combination. It is believed that the use of an aliphatic monoamine as the monoamine component makes it easier to break up aggregates.
  • a base grease is obtained by blending a diurea compound as a thickener with a base oil.
  • a base grease using a diurea compound as a thickener is produced by reacting a diisocyanate component with a monoamine component in a base oil.
  • the thickener is, for example, 5% to 30% by mass, preferably 10% to 20% by mass, more preferably more than 10% to 14% by mass, and even more preferably more than 10% to 13% by mass, based on the total amount (100% by mass) of the base oil and thickener.
  • additives can be added to the grease composition as necessary.
  • additives include antioxidants such as amine-based, phenol-based, and sulfur-based compounds; extreme pressure agents such as phosphate esters such as tricresyl phosphate, phosphite esters such as tricresyl phosphite, thiophosphates, thiophosphites, zinc alkyldithiophosphates (ZnDTP), molybdenum alkyldithiophosphates (MoDTP), and zinc dithiocarbamate (ZnDTC); and rust inhibitors such as Ca sulfonates and Ba sulfonates.
  • antioxidants such as amine-based, phenol-based, and sulfur-based compounds
  • extreme pressure agents such as phosphate esters such as tricresyl phosphate, phosphite esters such as tricresyl phosphite, thiophosphates, thiophosphites
  • the worked penetration of the grease composition is in the range of 230 to 300, preferably 250 to 280. As shown in the examples below, if the worked penetration is less than 230, the thickener will not easily dissolve agglomerations, and the resulting hardness will be more likely to induce vibration. On the other hand, if the worked penetration exceeds 300, there is a risk that break-in properties will be reduced.
  • the rolling bearing device of the present invention can eliminate oil shortages by supplying lubricating oil to the raceway surface through oil supply, and can also suppress the progression of deterioration of the grease composition and vibration by eliminating the aggregation of the thickener (see Figure 4, for example).
  • the lubricating oil supplied by the lubricating oil supply mechanism can be any of the various oils listed in the base oil section above.
  • the lubricating oil is preferably selected from the group consisting of synthetic hydrocarbon oil, ester oil, and a mixed oil of synthetic hydrocarbon oil and ester oil.
  • an ester oil can be used as the lubricating oil
  • a synthetic hydrocarbon oil or a mixed oil of synthetic hydrocarbon oil and ester oil can be used as the base oil.
  • the same type of oil as the base oil may also be used as the lubricating oil, and for example, synthetic hydrocarbon oil can be used as both the lubricating oil and the base oil.
  • the kinetic viscosity of the lubricating oil at 40° C. is preferably 10 mm 2 /s to 100 mm 2 /s, and more preferably 10 mm 2 /s to 50 mm 2 /s.
  • the kinetic viscosity of the lubricating oil at 40° C. is preferably within ⁇ 30 mm 2 /s of the kinetic viscosity of the base oil at 40° C., may be within ⁇ 20 mm 2 /s, may be within ⁇ 10 mm 2 /s, or may be the same as the kinetic viscosity of the base oil at 40° C.
  • a lubricant that has a high affinity with the base oil or has a kinetic viscosity similar to that of the base oil. This makes it easier for the lubricant to reach the desired location (such as the raceway surface) after lubrication, making it easier to optimally exert the effects of lubrication.
  • the increased oil separation rate of the grease composition can be reduced by supplying a lubricating oil.
  • the oil separation rate can be reduced from a state in which the oil separation rate is 50% or more (preferably 60% or more) to 30% or less (preferably 25% or less) by supplying oil.
  • the oil separation rate is calculated by the following formula (1).
  • Oil separation rate (wt%) ⁇ 1-(thickener concentration of new grease)/(thickener concentration of used grease) ⁇ 100 (1)
  • additives such as those listed in the grease composition may be added to the lubricating oil.
  • an angular contact ball bearing is shown as an example of a rolling bearing, but the rolling bearing in the rolling bearing device of the present invention can also be a deep groove ball bearing, a cylindrical roller bearing, a tapered roller bearing, a spherical roller bearing, a needle roller bearing, a thrust cylindrical roller bearing, a thrust tapered roller bearing, a thrust needle roller bearing, a thrust spherical roller bearing, etc.
  • the rolling bearing device of the present invention is not limited to the configuration shown in FIG. 1.
  • a pump or tank may be disposed inside the rolling bearing as part of the lubricating oil supply mechanism.
  • the rolling bearing device of the present invention has excellent lubrication durability even under high-speed rotation conditions and can be used for a long period of time.
  • the dn value is 70 ⁇ 10 4 or more, and preferably 110 ⁇ 10 4 or more.
  • the upper limit of the dn value is, for example, 200 ⁇ 10 4 or 180 ⁇ 10 4 .
  • the above-mentioned rolling bearing device is able to supply lubricating oil to the rolling area of the rolling bearing, which contributes to long-term stabilization of the rolling characteristics and improved lifespan.
  • Grease compositions with the compositions shown in Tables 1 and 2 were prepared as grease compositions to be filled in the rolling bearings in advance.
  • the content of the base oil and thickener indicates the content (mass%) relative to the base grease (base oil + thickener).
  • the monoamine component of the thickener was a combination of an aliphatic monoamine and an alicyclic monoamine, or a combination of an aliphatic monoamine and an aromatic monoamine, the molar ratio of each amine was 1:1.
  • the columns for the type of oil and additives used are indicated with " ⁇ ".
  • PAO oil is used as the synthetic hydrocarbon oil. Note that 1) to 8) below in Table 1 are the same in Table 2. The results of Example 3 are also listed in Table 2 for comparison.
  • Amount of oiling achieved by thickener 1-1 Work of adhesion
  • the work of adhesion is the energy required to separate two substances when they are attached at the interface, and the larger the work of adhesion, the stronger the adhesion.
  • the work of adhesion was measured using a "surface free energy contact angle meter (LSE-B100)" manufactured by Nick Co., Ltd., as a technique for quantitatively and simply evaluating the adhesion force between the thickener and steel.
  • the residue (organic solvent insoluble matter; grease solid component) obtained by Soxhlet extraction of the oil (organic solvent soluble matter) from the grease composition was homogenized with a homogenizer, and then diluted with petroleum benzine to prepare a dipping liquid.
  • Amount of oil supplied ⁇ Grease composition not containing ester oil in the base oil> Using a machine tool life tester, for example, a break-in operation with the grease composition was completed at a dn value of 150 x 104 , and then a predetermined amount of ester oil was applied as a lubricant (tracer) at a predetermined position of the tester, and the amount of movement of the ester oil was measured by FT-IR.
  • the absorbance of the peak derived from the ester group (dotted area in Figure 3 (b)) was obtained from the infrared spectrum, and the amount of movement was calculated from a calibration curve obtained in advance.
  • FIG. 4 shows a microscopic image of the grease composition.
  • FIG. 4(a) to (d) are images of the grease composition in each state observed with an optical microscope at a magnification of 200 times.
  • FIG. 4(a) and (b) show new (unused) grease compositions that have not been subjected to rolling or shearing forces. In these cases, no aggregates were observed regardless of the oil separation rate.
  • FIG. 4(c) shows aggregates of thickener fibers as shown in FIG. 4(c).
  • FIG. 4(d) shows the state after lubricating oil was fed to the grease composition in this state and stirred. As shown in FIG. 4(d), it was confirmed that the oil separation rate was significantly reduced (the reduction was about 48%) and the aggregates were finer.
  • Break-in property For example, break-in was performed with the grease composition at a dn value of 150 x 10 4 until the temperature stabilized. The break-in property was evaluated as follows: if the temporary temperature rise (temperature bump) during break-in was 30°C or less than the stable temperature (temperature after break-in) at each rotation speed, it was marked as "A”; if it was more than 30°C and less than 40°C, it was marked as "B”; if it was more than 40°C and less than 50°C, it was marked as "C”; and if it was more than 50°C, it was marked as "D” in Tables 1 and 2. Note that the break-in here does not include "short-term break-in" in which the engine is run at about the maximum rotation speed for about 1 minute, and this is repeated 2 to 3 times to break in the engine.
  • Examples 1 to 11 which combined a grease composition with a base oil having a 40°C kinematic viscosity of less than 120 mm2 /s and a worked penetration of 230 to 300 with lubricating oil, showed good results in all evaluations.
  • the evaluation of the ease of loosening of the thickener aggregates was more excellent by setting the grease composition's consistency and the lubricating oil's 40°C kinematic viscosity in an appropriate range (Examples 3, 8 to 11).
  • the lower the consistency the greater the amount of thickener, so there was a tendency for the thickener to be more likely to aggregate and less likely to be loosened (Comparative Example 3).
  • Comparative Example 4 was excellent in the evaluation of the ease of loosening of the thickener aggregates, but the break-in property was reduced. Comparative Example 4 had a high consistency and was soft, so the transition from the churning state to the channeling state was less likely to occur, and it is also assumed that the grease would re-flow into the raceway surface, which is thought to have reduced the break-in property.
  • the rolling bearing device of the present invention can ensure lubrication durability with grease lubrication even under high-speed rotation conditions, and can suppress temperature rise during break-in, making it particularly suitable for use in rolling bearing devices used at high speeds, such as bearings for machine tool main spindles.

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

Abstract

L'invention concerne un dispositif de palier à roulement grâce auquel il est possible d'assurer une durabilité de lubrification dans une lubrification de graisse même dans des conditions de roulement à grande vitesse et de supprimer toute augmentation de température pendant une opération de réchauffage. Le présent dispositif de palier à roulement (20) comprend : des roulements à billes angulaires (1) comportant une bague intérieure (2), une bague extérieure (3), une pluralité de billes (4) qui sont interposées entre la bague intérieure (2) et la bague extérieure (3), et une composition de graisse (7) qui est scellée dans un espace de palier entre la bague intérieure (2) et la bague extérieure (3), la composition de graisse (7) comprenant une huile de base qui présente une viscosité dynamique à 40 °C inférieure à 120 mm2/s et un épaississant qui comprend un composé d'urée, et la composition de graisse (7) présentant une consistance de mélange de 230 à 300 telle que mesurée conformément à JIS K 2220 ; et un mécanisme d'alimentation en huile de lubrification (11) permettant de fournir une huile de lubrification dans l'espace de palier dans les roulements à billes angulaires (1) et alimenter des surfaces orbitales en huile de lubrification.
PCT/JP2023/038311 2022-11-04 2023-10-24 Dispositif de palier à roulement WO2024095825A1 (fr)

Applications Claiming Priority (2)

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JP2022177726A JP2024067549A (ja) 2022-11-04 2022-11-04 転がり軸受装置
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0688085A (ja) * 1992-09-07 1994-03-29 Nippon Kouyu:Kk 回転機軸受用グリース組成物
JP2000169872A (ja) * 1998-10-02 2000-06-20 Ntn Corp 高速転がり軸受用グリ―スおよびスピンドル用転がり軸受
JP2003083341A (ja) * 2001-09-12 2003-03-19 Nsk Ltd 転がり軸受
JP2003193080A (ja) * 2001-10-16 2003-07-09 Nsk Ltd 転がり軸受用グリース組成物及び転がり軸受
JP2004083798A (ja) * 2002-08-28 2004-03-18 Nsk Ltd グリース組成物及び転動装置
JP2006029473A (ja) * 2004-07-16 2006-02-02 Nsk Ltd アンギュラ玉軸受及び工作機械
JP5916781B2 (ja) * 2007-02-26 2016-05-11 Ntn株式会社 転がり軸受
JP2020159547A (ja) * 2019-03-19 2020-10-01 Ntn株式会社 潤滑油供給ユニットおよび軸受装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0688085A (ja) * 1992-09-07 1994-03-29 Nippon Kouyu:Kk 回転機軸受用グリース組成物
JP2000169872A (ja) * 1998-10-02 2000-06-20 Ntn Corp 高速転がり軸受用グリ―スおよびスピンドル用転がり軸受
JP2003083341A (ja) * 2001-09-12 2003-03-19 Nsk Ltd 転がり軸受
JP2003193080A (ja) * 2001-10-16 2003-07-09 Nsk Ltd 転がり軸受用グリース組成物及び転がり軸受
JP2004083798A (ja) * 2002-08-28 2004-03-18 Nsk Ltd グリース組成物及び転動装置
JP2006029473A (ja) * 2004-07-16 2006-02-02 Nsk Ltd アンギュラ玉軸受及び工作機械
JP5916781B2 (ja) * 2007-02-26 2016-05-11 Ntn株式会社 転がり軸受
JP2020159547A (ja) * 2019-03-19 2020-10-01 Ntn株式会社 潤滑油供給ユニットおよび軸受装置

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