WO2019082870A1 - Roulement graissé étanche - Google Patents

Roulement graissé étanche

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Publication number
WO2019082870A1
WO2019082870A1 PCT/JP2018/039272 JP2018039272W WO2019082870A1 WO 2019082870 A1 WO2019082870 A1 WO 2019082870A1 JP 2018039272 W JP2018039272 W JP 2018039272W WO 2019082870 A1 WO2019082870 A1 WO 2019082870A1
Authority
WO
WIPO (PCT)
Prior art keywords
grease
bearing
roller
roller bearing
inner ring
Prior art date
Application number
PCT/JP2018/039272
Other languages
English (en)
Japanese (ja)
Inventor
涼太 近藤
川村　隆之
Original Assignee
Ntn株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2017204692A external-priority patent/JP2019078312A/ja
Priority claimed from JP2017204704A external-priority patent/JP2019078313A/ja
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Publication of WO2019082870A1 publication Critical patent/WO2019082870A1/fr

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Classifications

    • 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
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • 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
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/36—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers
    • 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
    • F16C33/34—Rollers; Needles
    • 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
    • F16C33/34—Rollers; Needles
    • F16C33/36—Rollers; Needles with bearing-surfaces other than cylindrical, e.g. tapered; with grooves in the bearing surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/62—Selection of substances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/64—Special methods of manufacture
    • 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

Definitions

  • the present invention relates to a grease-sealed roller bearing used under high temperature conditions and light load conditions, and more particularly to a tapered roller bearing.
  • Roller bearings are widely used as bearings for high loads such as power transmission systems for automobiles and industries. Grease is enclosed in such a roller bearing in order to provide lubricity.
  • the use environment of the roller bearings is becoming more and more severe, and greases exhibiting excellent lubricating characteristics even under high load conditions. Examinations are being conducted.
  • Patent Document 1 describes that incorporation of a melamine (iso) cyanuric acid adduct into a grease exhibits excellent lubricating properties even under severe conditions and is also excellent in bearing life.
  • Grease-sealed roller bearings are used not only under heavy load conditions but also under light load conditions. It is desirable that the roller bearings used under such light load conditions also have excellent bearing life. However, there is still room for improvement in the grease of the roller bearing.
  • the present invention has been made in view of the above circumstances, and has excellent bearing life in use under high temperature conditions and light load conditions (conditions in which rollers and ridges are in a predetermined contact state).
  • An object of the present invention is to provide a sealed roller bearing.
  • the grease-sealed roller bearing according to the present invention comprises an inner ring and an outer ring which is a bearing ring, a plurality of rollers rolling between the inner ring and the outer ring, and a grease sealed around the roller.
  • a grease-sealed roller bearing having a ridge and in sliding contact with the roller at the ridge, the roller bearing being used under high temperature conditions of 80 ° C. or higher and light load conditions under these conditions.
  • the contact state between the buttocks and the rollers belongs to the isoviscous-rigid region in the Greenwood-Johnson diagram, the base oil of the grease is mainly composed of mineral oil, and the thickener of the grease is aliphatic. It is characterized by being a diurea compound.
  • the light load condition is characterized in that the maximum contact surface pressure of the bearing ring is 0.3 GPa or less and the surface pressure of the heel portion is 0.1 GPa or less.
  • the bearing member of at least one of the inner ring, the outer ring, and the roller is made of carburized steel.
  • the grease-sealed roller bearing is a tapered roller bearing, and the roller is a tapered roller, and the inner ring has a small bowl and a large bowl as the collar portion, and is in sliding contact with the tapered roller at the large bowl. It is characterized by
  • the selection method of the present invention comprises an inner ring and an outer ring which are races, a plurality of rollers rolling between the inner ring and the outer ring, and a grease sealed around the rollers, and the inner ring has a ridge portion A grease-sealed roller bearing having a sliding contact with the roller at the buttock portion, the selection method of selecting a thickener for the grease, wherein the base oil of the grease contains a mineral oil as a main component;
  • the method includes a calculation step of calculating a lubrication area in a Greenwood-Johnson diagram from use conditions of the roller bearing, and a selection step of selecting the thickener according to the calculated lubrication area, and the selection step includes In the calculation step, it is determined that the use condition of the roller bearing is used under the high temperature condition of 80 ° C. or more and the light load condition and belongs to the equal viscosity-rigid region.
  • a step of selecting the thickener of the grease aliphatic diurea compound
  • the grease-sealed roller bearing according to the present invention is a bearing in which a ridge is formed on the inner ring and is in sliding contact with the roller at the ridge, and the roller bearing is used under high temperature conditions of 80 ° C. or higher and light load conditions
  • the contact with the buttocks under these conditions belongs to the isoviscous-rigid region in the Greenwood-Johnson diagram.
  • the surfaces of the tapered roller and the buttocks that are in sliding contact with each other are completely separated by the grease (fluid lubrication state).
  • the base oil of grease is mineral oil as the main component and the thickener of grease is an aliphatic diurea compound, so bearing life when used under high temperature conditions of 80 ° C or more and light load conditions Can be extended.
  • the contact state between the roller and the collar portion in the grease-sealed roller bearing, attention is paid to the contact state between the roller and the collar portion.
  • the contact between the roller and the ridge in the presence of grease can be considered using the elastic fluid lubrication (EHL) theory. That is, the contact state in use may be considered as any of four lubricating regions considering the presence or absence of elastic deformation of the friction surface of two objects and the presence or absence of viscosity change of grease (lubricating oil) it can.
  • the tapered roller bearing 11 has an inner ring 12 having a tapered raceway surface 12a on the outer peripheral surface, an outer ring 13 having a tapered raceway surface 13a on the inner peripheral surface, and a raceway surface 12a of the inner ring 12 And a raceway surface 13a of the outer ring 13, and a cage 15 for holding each tapered roller 14 in a pocket portion so as to roll freely.
  • the cage 15 has a large diameter ring portion and a small diameter ring portion connected by a plurality of column portions, and the tapered roller 14 is housed in a pocket portion between the column portions.
  • a large weir 12b is integrally formed on the large diameter end of the inner ring 12, and a small weir 12c is integrally formed on the small diameter end.
  • the inner ring in a tapered roller bearing has a tapered raceway surface and therefore has a small diameter side and a large diameter side as viewed in the axial direction, and "small ridge” is a weir provided at the small diameter side end, "large diameter” “ ⁇ ” is a bowl provided at the large diameter end.
  • the tapered roller 14 is pressed to the large diameter side, and the large diameter 12b receives this load.
  • the small roller 12c prevents the tapered roller 14 from falling off to the small diameter side until the bearing is incorporated into various devices.
  • the tapered roller 14 receives rolling friction between the raceway surface 12 a of the inner ring 12 and the raceway surface 13 a of the outer ring 13, and receives sliding friction between the raceway 12 b of the inner ring 12.
  • Grease 16 is enclosed at least around tapered roller 14 to reduce these frictions.
  • tapered roller bearings are characterized in that they are used under high temperature conditions of 80 ° C. or higher and under light load conditions.
  • the light load condition is a condition in which the surface pressure at the buttocks (including the large ridges) is smaller than the surface pressure of a general tapered roller bearing.
  • the contact state with the heel under high temperature conditions of 80 ° C. or higher and light load conditions belongs to the isoviscous-rigid region in the Greenwood-Johnson diagram.
  • Tapered roller bearings are subject to rolling friction and sliding friction in the presence of grease.
  • the state of friction at the sliding portion in the presence of the lubricant is (1) equal viscosity from the point of presence or absence of elastic deformation of the sliding member and presence or absence of viscosity increase of the lubricant due to pressure.
  • -Rigid body area IR area
  • PR area high pressure viscosity-rigid body area
  • IE area isometric viscosity-elastic body area
  • PE area high pressure viscosity-elastic body area 4 It is roughly divided into two areas.
  • the light load condition” in the present invention is a condition in which the state of friction in the buttocks belongs to the IR region among the four regions.
  • the deformation on the friction surface between the tapered roller and the buttock can be ignored, and the viscosity increase due to the pressure of the grease can be ignored. That is, in the state where the contact state at the buttocks belongs to the IR region, the surfaces of the tapered rollers and the buttocks that are in sliding contact with each other are completely separated by the grease (fluid lubrication state).
  • the lubrication region diagram is also referred to as a Greenwood-Johnson diagram, and is a diagram in which the horizontal axis is dimensionless number g E which is an elastic parameter and the vertical axis is dimensionless number g V which is a viscosity parameter.
  • the dimensionless number g E and the dimensionless number g V are respectively represented by the following equations (1) and (2).
  • g E ( ⁇ / ER X 2 ) 8/3 / ( ⁇ 0 u / ER X ) 2 (1)
  • g V ( ⁇ E) ( ⁇ / ER X 2 ) 3 / ( ⁇ 0 u / ER X ) 2 (2)
  • R X represents the equivalent radius in the plane including the x axis
  • u (u 1 + u 2 ) / 2
  • ⁇ 0 is the viscosity under atmospheric pressure
  • ⁇ is the pressure of viscosity Indicate a coefficient
  • ⁇ indicates a load
  • E indicates an equivalent elastic modulus.
  • the lubricating region diagram of FIG. 2 is divided into the above-mentioned regions (1) to (4) according to the dimensionless numbers g E and g V.
  • the dimensionless numbers g E and g V calculated by the above equation are applied to FIG. 2 to identify to which region the contact state under the use conditions belongs.
  • the grease-sealed roller bearing of the present invention is used under the condition that the contact state between the flange and the tapered roller belongs to the IR region.
  • the surface pressure of the buttock portion is 0.1 GPa or less, preferably 0.05 GPa or less, more preferably 0.01 GPa or less. At this time, it is particularly preferable that the maximum contact surface pressure at the bearing ring is 0.3 GPa or less.
  • the bearing members of the inner ring, the outer ring, and the roller are made of an iron-based metal material.
  • the iron-based metal material bearing steel, carburized steel, carbon steel for machine structure, cold-rolled steel, or hot-rolled steel can be used. Among these, it is preferable to use a carburized steel having high heat resistance.
  • carburized steel SCM415 grade
  • the iron-based metal materials used for the bearing members may be different from each other.
  • the grease sealed in the grease-sealed roller bearing of the present invention is composed of a base oil containing mineral oil and a thickener.
  • mineral oil spindle oil, refrigeration oil, turbine oil, machine oil, dynamo oil, highly refined mineral oil and the like can be mentioned.
  • Highly refined mineral oil is obtained, for example, by catalytically hydrocracking and synthesizing a slug wax obtained from the residue of vacuum distillation.
  • the highly refined mineral oil preferably has a sulfur content of less than 0.1% by weight, more preferably less than 0.01% by weight.
  • Other examples include GTL oils synthesized by the Fischer-Tropsch method.
  • the above-mentioned base oil consists only of mineral oil or is a mixture of mineral oil and other base oils.
  • a mineral oil for example, ether oil, ester oil, synthetic hydrocarbon oil (PAO oil), silicone oil, fluorine oil and a mixture of these oils can be used.
  • PAO oil synthetic hydrocarbon oil
  • silicone oil silicone oil
  • fluorine oil fluorine oil
  • the base oil of the present invention contains a mineral oil as a main component, the content of the mineral oil is 50% by mass or more, preferably 80% by mass or more based on the whole base oil (mixed oil).
  • the kinematic viscosity of the base oil is preferably 10 to 200 mm 2 / s at 40 ° C. More preferably, it is 10 to 100 mm 2 / s, further preferably 30 to 100 mm 2 / s.
  • the base oil is preferably contained in an amount of 60 to 90% by mass with respect to the entire grease. If the content of the base oil is less than 60% by mass, the life may be reduced, and if it exceeds 90% by mass, the amount of the thickening agent may be relatively reduced to make it difficult to form a grease.
  • Aliphatic diurea compounds are used as thickening agents. Aliphatic diurea compounds are obtained by reacting a diisocyanate component with a monoamine component.
  • the diisocyanate component include phenylene diisocyanate, tolylene diisocyanate, diphenyl diisocyanate, diphenylmethane diisocyanate (MDI), octadecane diisocyanate, decane diisocyanate, hexane diisocyanate, and the like. Among these, aromatic diisocyanates are more preferred.
  • aliphatic monoamines are used as the monoamine component, and examples thereof include hexylamine, octylamine, dodecylamine, hexadecylamine, octadecylamine, stearylamine, oleylamine and the like.
  • An aliphatic diurea compound is blended with a base oil as a thickener to obtain a base grease.
  • the base grease having an aliphatic diurea compound as a thickener is prepared by reacting a diisocyanate component and a monoamine component in a base oil.
  • the proportion of the thickener contained in the base grease is 10% by mass or more and less than 30% by mass, preferably 10% by mass or more and less than 20% by mass.
  • the combined penetration (JIS K 2220) of the grease is preferably in the range of 200 to 350. If the consistency is less than 200, oil separation may be small, resulting in poor lubrication. On the other hand, when the consistency is more than 350, the grease is soft and tends to flow out of the bearing, which is not preferable.
  • additives can be added to the grease as required.
  • Additives include, for example, extreme pressure agents such as organic zinc compounds and organic molybdenum compounds, antioxidants such as amines, phenols and sulfur compounds, antiwear agents such as sulfur and phosphorus compounds, polyhydric alcohols
  • Antirust agents such as esters, friction reducing agents such as molybdenum disulfide and graphite, and oil agents such as esters and alcohols.
  • the grease-sealed roller bearing is the end portion of the roller and the flange portion of the bearing ring (the large diameter of the tapered roller bearing and both axial ends of the inner ring in the cylindrical roller bearing).
  • cylindrical roller bearings, self-aligning roller bearings, needle roller bearings, thrust cylindrical roller bearings, thrust tapered roller bearings, thrust needles may be used as long as they have a sliding contact with the wedge).
  • Roller bearings, thrust spherical roller bearings, etc. can be used.
  • the grease-sealed roller bearing of the present invention is excellent in durability under high temperature, it is used at high temperature of 80 ° C. or more. Preferably, it is used at a high temperature of 100 ° C. or more.
  • the grease-sealed roller bearing according to the present invention is a high temperature of 100 ° C. or more, and a maximum contact surface pressure at the bearing ring is 0.3 GPa or less, and a surface pressure at the heel portion is 0.1 GPa or less It is particularly preferable to be used under the following conditions, or at a high temperature of 100 ° C. or more, and a condition in which the contact state with the buttocks belongs to the IR region. As an apparatus used as such a use condition, a transmission etc. are mentioned, for example.
  • Example 1 Comparative Example 1, and Comparative Example 2 ⁇ Seized life test>
  • the greases having the compositions shown in Table 1 were each enclosed in 1.8 g of tapered roller bearings 30204 (bearing dimensions: inner diameter 20 mm, outer diameter 47 mm, width 15.25 mm) to produce test bearings.
  • the obtained test bearing was rotated at a rotational speed of 5000 min ⁇ 1 under the conditions of a bearing outer ring outer temperature of 120 ° C., a radial load of 67 N and an axial load of 67 N, and the time until the seizure was measured. Under this test condition, the maximum contact surface pressure at the bearing ring is 0.21 GPa, and the surface pressure at the gutter is 0.05 Pa.
  • the dimensionless number g E calculated from the above equation (1) is 2
  • the dimensionless number g V calculated from the above equation (2) is 5, so Belongs.
  • 1500 hours or more was taken as pass.
  • all the bearings were implemented in the open state without the seal cover. The results are shown in Table 1.
  • Example 1 The result was a pass only when the grease of Example 1 was used. From Table 1, when aliphatic diurea compounds are used as thickeners, the life is longer than when aromatic diurea compounds are used (Comparative Example 1) or when lithium soap is used (Comparative Example 2). It could be extended significantly. The bearing life due to the difference between these thickeners was greater for aromatic diurea compounds than for lithium soaps, and was further greater for aliphatic diurea compounds than for aromatic diurea compounds. On the other hand, when deep groove ball bearings were used as reference data, the magnitude of the bearing life was surprisingly reversed.
  • the bearing life of the aromatic diurea compound was larger than that of the aliphatic diurea compound, and further, the lithium soap was larger than that of the aromatic diurea compound.
  • the tapered roller bearing unlike the ball bearing, has a portion (ridge portion) in sliding contact with the rolling element, and it is considered that the difference in the type of contact is different between the roller bearing and the ball bearing.
  • the thickening agent suitable for extending the bearing life is different from the ball bearing. That is, when the above contact state is in a state of belonging to the IR region, an aliphatic diurea compound can be selected as a thickener.
  • the present invention can also be said to be a selection method of selecting a thickener for grease according to the contact state between the roller and the heel portion. This selection method includes a calculation step of calculating the lubrication region in the Greenwood-Johnson diagram from the use conditions of the roller bearings, and a selection step of selecting a thickener when the calculated lubrication region is in the IR region.
  • the contact pressure of the buttocks (large diameter in the case of tapered roller bearings) is 0.08 GPa or more, and the maximum contact surface pressure at the bearing ring is 0.4 GPa or more is there. Furthermore, it is more preferable that the contact pressure of the buttocks be 0.09 GPa or more and the maximum contact surface pressure at the bearing ring be 0.5 GPa or more.
  • an aromatic diurea compound is used as a thickener.
  • the aromatic diurea compound is obtained by reacting a diisocyanate component with a monoamine component.
  • the diisocyanate component include phenylene diisocyanate, tolylene diisocyanate, diphenyl diisocyanate, diphenylmethane diisocyanate (MDI), octadecane diisocyanate, decane diisocyanate, hexane diisocyanate, and the like.
  • aromatic diisocyanates are more preferred.
  • aromatic monoamine component aromatic monoamine is used, and examples thereof include aniline and p-toluidine.
  • Grease used in the PE area is the same as in the IR area with respect to the conditions other than the thickener, such as the blending amount of base oil and thickener, consistency of grease, types of additives, applicable bearing types, etc. is there.
  • the grease-sealed roller bearing in which the grease is sealed is excellent in the durability under a high load, it is suitable, for example, as a roller bearing used in a transmission device or differential device such as an automobile, an industrial machine, and a railway vehicle.
  • Test Example 1 to Test Example 3 ⁇ Seized life test>
  • the greases having the compositions shown in Table 2 were each enclosed in 1.8 g of tapered roller bearings 30204 (bearing size: inner diameter 20 mm, outer diameter 47 mm, width 15.25 mm) to prepare test bearings.
  • the obtained test bearing was rotated at a rotational speed of 5000 min ⁇ 1 under the conditions of a bearing outer ring outer temperature of 120 ° C., a radial load of 67 N, and an axial load of 640 N, and the time until the seizure was measured. Under this test condition, the maximum contact surface pressure at the bearing ring is 0.56 GPa, and the surface pressure at the gutter is 0.09 GPa.
  • the dimensionless number g E calculated from the above equation (1) is 220
  • the dimensionless number g V calculated from the above equation (2) is 1300, so Belongs.
  • 500 hours or more was taken as passing.
  • the aromatic diurea compound can be selected as the thickener, and the contact state belongs to the IR region.
  • the selection method of the present invention includes a calculation step of calculating the lubrication region in the Greenwood-Johnson diagram from the use condition of the roller bearing, and the calculated lubrication And a selection step of selecting the thickener according to the region, and the calculation step includes (1) the high temperature condition of 80.degree. C.
  • the roller bearing is the maximum contact surface pressure of the bearing ring Is 0.5 GPa or more, and the contact pressure of the buttocks is 0.09 GPa or more, and the contact state between the buttocks and the rollers is Greenwood-Johnso It is a process of determining that it is in the state of belonging to the high pressure viscosity-elastic region in the diagram, and the selection step is the thickener thickening agent of the grease in the case of belonging to the equal viscosity-rigid region of (1) above. Is selected as an aliphatic diurea compound, and when it belongs to the high pressure viscosity-elastic region of (2), it is a step of selecting a thickener of the grease as an aromatic diurea compound.
  • the grease-sealed roller bearing according to the present invention has excellent bearing life in use under high temperature conditions and light load conditions, and thus can be widely used as grease-sealed roller bearings used under such conditions. For example, it is used for a transmission.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

L'invention concerne un roulement à rouleaux graissé étanche ayant une durée de vie de roulement exceptionnelle lorsqu'il est utilisé dans des conditions de haute température et des conditions de charge légère. Un roulement à rouleaux coniques 11 comprend : une bague intérieure 12 et une bague extérieure 13, qui sont des bagues de roulement ; une pluralité de rouleaux coniques 14, qui roulent entre la bague intérieure 12 et la bague extérieure 13 ; et de la graisse 16 retenue au niveau des périphéries des rouleaux coniques 14. La bague intérieure 12 comporte une grande bride 12b et vient en contact glissant avec les rouleaux coniques 14 dans la grande bride 12b, le roulement à rouleaux coniques 11 est utilisé dans des conditions de haute température de 80 °C, ou plus, et dans des conditions de charge légère, l'état de contact entre la grande bride 12b et les rouleaux coniques 14 dans ces conditions se situe sous une zone de corps rigide de viscosité égale dans un diagramme Greenwood-Johnson, l'huile de base de la graisse 16 comprend une huile minérale en tant que composant primaire, et un épaississant de la graisse 16 est un composé de diurée aliphatique.
PCT/JP2018/039272 2017-10-23 2018-10-23 Roulement graissé étanche WO2019082870A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2017-204692 2017-10-23
JP2017-204704 2017-10-23
JP2017204692A JP2019078312A (ja) 2017-10-23 2017-10-23 グリース封入ころ軸受
JP2017204704A JP2019078313A (ja) 2017-10-23 2017-10-23 グリース封入ころ軸受

Publications (1)

Publication Number Publication Date
WO2019082870A1 true WO2019082870A1 (fr) 2019-05-02

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PCT/JP2018/039272 WO2019082870A1 (fr) 2017-10-23 2018-10-23 Roulement graissé étanche

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WO (1) WO2019082870A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008111515A (ja) * 2006-10-31 2008-05-15 Ntn Corp 鉄道車両用軸受
JP2008303893A (ja) * 2007-06-05 2008-12-18 Nsk Ltd 円筒ころ軸受
WO2017150609A1 (fr) * 2016-03-01 2017-09-08 Ntn株式会社 Roulement comportant un joint d'étanchéité, et roulement à billes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008111515A (ja) * 2006-10-31 2008-05-15 Ntn Corp 鉄道車両用軸受
JP2008303893A (ja) * 2007-06-05 2008-12-18 Nsk Ltd 円筒ころ軸受
WO2017150609A1 (fr) * 2016-03-01 2017-09-08 Ntn株式会社 Roulement comportant un joint d'étanchéité, et roulement à billes

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