WO2024248027A1 - 転がり軸受及びその製造方法 - Google Patents

転がり軸受及びその製造方法 Download PDF

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Publication number
WO2024248027A1
WO2024248027A1 PCT/JP2024/019667 JP2024019667W WO2024248027A1 WO 2024248027 A1 WO2024248027 A1 WO 2024248027A1 JP 2024019667 W JP2024019667 W JP 2024019667W WO 2024248027 A1 WO2024248027 A1 WO 2024248027A1
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WO
WIPO (PCT)
Prior art keywords
rolling bearing
cage
rolling
resin
outer ring
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2024/019667
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English (en)
French (fr)
Japanese (ja)
Inventor
康男 松崎
克 菅原
泰右 丸山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NSK Ltd
Original Assignee
NSK Ltd
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
Application filed by NSK Ltd filed Critical NSK Ltd
Priority to CN202480036695.0A priority Critical patent/CN121219502A/zh
Priority to JP2024565203A priority patent/JP7740579B2/ja
Priority to EP24815508.7A priority patent/EP4722550A1/en
Publication of WO2024248027A1 publication Critical patent/WO2024248027A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • F16C19/163—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 with angular contact
    • 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
    • F16C33/32—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
    • F16C33/38—Ball cages
    • F16C33/41—Ball cages comb-shaped
    • F16C33/412—Massive or moulded comb cages, e.g. snap ball cages
    • F16C33/414—Massive or moulded comb cages, e.g. snap ball cages formed as one-piece cages, i.e. monoblock comb cages
    • F16C33/416—Massive or moulded comb cages, e.g. snap ball cages formed as one-piece cages, i.e. monoblock comb cages made from plastic, e.g. injection moulded comb cages
    • 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
    • F16C33/38—Ball cages
    • F16C33/44—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
    • F16C33/38—Ball cages
    • F16C33/44—Selection of substances
    • F16C33/445—Coatings
    • 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
    • F16C33/46—Cages for rollers or needles
    • F16C33/56—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
    • F16C33/46—Cages for rollers or needles
    • F16C33/56—Selection of substances
    • F16C33/565—Coatings
    • 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
    • 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
    • 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
    • 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
    • F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
    • 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
    • F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
    • F16C33/6688—Lubricant compositions or properties, e.g. viscosity
    • 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
    • F16C33/6696—Special parts or details in view of lubrication with solids as lubricant, e.g. dry coatings, powder
    • 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
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/02—Plastics; Synthetic resins, e.g. rubbers comprising fillers, fibres
    • F16C2208/04—Glass fibres
    • 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
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/60—Polyamides [PA]
    • 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
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/60—Polyamides [PA]
    • F16C2208/62—Polyamides [PA] high performance polyamides, e.g. PA12, PA46
    • 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
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/80—Thermosetting resins
    • F16C2208/90—Phenolic resin
    • 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
    • F16C2300/00—Application independent of particular apparatuses
    • F16C2300/20—Application independent of particular apparatuses related to type of movement
    • F16C2300/22—High-speed rotation

Definitions

  • the present invention relates to a rolling bearing and a manufacturing method thereof.
  • a rolling bearing is roughly constructed by holding multiple rolling elements between an outer ring and an inner ring at equal intervals by a cage so that they can roll freely, and filling the bearing space formed by the outer ring, inner ring, and rolling elements with a lubricant.
  • Metallic cages made of iron or other materials are often used as cages, as in Patent Document 1, for example.
  • Metallic cages have the advantage of being strong and can be easily manufactured by machining such as pressing.
  • the present invention aims to provide a rolling bearing with a long life without increasing costs.
  • the inventors discovered that when a plastic cage is used, a coating derived from the constituent material of the cage is formed on the inner ring, outer ring, and rolling elements, and this led to the completion of the present invention.
  • the above object of the present invention is achieved by the following configuration [1] related to the rolling bearing.
  • a rolling bearing comprising a plurality of rolling elements held by a cage between an outer ring and an inner ring so as to be freely rollable at equal intervals and filled with a lubricant,
  • the cage is a resin cage
  • a rolling bearing characterized in that at least one of the outer ring, the inner ring and the rolling elements has a coating derived from a constituent material of the resin cage.
  • a method for manufacturing a rolling bearing having a plurality of rolling elements held by a cage between an outer ring and an inner ring so as to be freely rollable at equal intervals and filled with a lubricant comprising the steps of: A resin cage is used as the cage, A method for manufacturing a rolling bearing, characterized in that a coating derived from a constituent material of the resin cage is formed on at least one of the outer ring, the inner ring, and the rolling elements by rotating the rolling bearing.
  • a plastic cage is used, and a coating derived from the constituent material of the plastic cage is formed on at least one of the outer ring, inner ring, and rolling elements, preventing direct contact between the inner and outer rings and the rolling elements, suppressing seizure and providing a rolling bearing with a long life.
  • a coating can be formed as the bearing rotates, eliminating the need for hardening processes and the like, and without increasing manufacturing costs.
  • FIG. 1 is a cross-sectional view that typically shows a ball bearing, which is an example of the rolling bearing of the present invention.
  • FIG. 2 is a schematic diagram showing a measuring device used for measuring the thickness of the oil film on the rolling surface in the examples.
  • FIG. 3 is a graph showing the test results of the test bearing using an iron cage in Test 1, in which (A) shows the change in outer ring temperature per rotation time, (B) shows the change in lubricating coating thickness in the gap between the inner ring raceway surface and the ball rolling surface per rotation time, and (C) shows the change in impedance per rotation time.
  • FIG. 1 is a cross-sectional view that typically shows a ball bearing, which is an example of the rolling bearing of the present invention.
  • FIG. 2 is a schematic diagram showing a measuring device used for measuring the thickness of the oil film on the rolling surface in the examples.
  • FIG. 3 is a graph showing the test results of the test bearing using an iron cage in Test 1, in which (A) shows the change in outer
  • Fig. 1 is a cross-sectional view showing a ball bearing.
  • the ball bearing shown in the figure is roughly configured such that balls 3, which are multiple rolling elements, are held by a cage 4 between an inner ring raceway surface 1a formed on the outer peripheral surface of an inner ring 1 and an outer ring raceway surface 2a formed on the inner peripheral surface of an outer ring 2, and a lubricant G filled in a bearing space 6 formed by the inner ring 1, the outer ring 2, and the balls 3 is sealed by a seal 5.
  • Reference symbol 2b denotes a seal fitting groove provided in the outer ring 2.
  • a resin cage is used as the cage 4, and a coating (hereinafter referred to as the "specific coating") derived from the constituent material of the resin cage is formed on at least one of the inner ring 1, outer ring 2, and ball 3, more specifically, on at least one of the inner ring raceway surface 1a, outer ring raceway surface 2a, and rolling surfaces of the ball 3.
  • This specific coating is formed when the resin cage wears as the bearing rotates, and wear powder made of the constituent material is transferred to the inner ring raceway surface 1a, outer ring raceway surface 2a, and rolling surfaces of the ball 3.
  • the inner ring 1 and outer ring 2 do not come into direct contact with the ball 3, and seizure is prevented even if the inner ring 1, outer ring 2, and ball 3 are all made of metal, and the rolling bearing has a long life.
  • the specific coating acts like a protective film to prevent seizure.
  • the resin cage is preferably made of a resin composition containing glass fiber for reinforcement. Accordingly, SiO2 is present in the specific coating.
  • the thickness of the specific coating is preferably 1 nm or more, and more preferably 10 nm or more. If the thickness is less than 1 nm, there is a risk that the anti-seizure effect will not be sufficient.
  • the lubricant G may be either a lubricating oil or a grease composition, but additive-free lubricating oil and grease composition base oils are preferred.
  • Additive-free means lubricating oils and base oils that do not contain various additives that are typically used in lubricating oils and base oils of grease compositions filled in bearings, such as antioxidants such as amines, phenols, sulfurs, zinc dithiophosphates, and zinc dithiocarbamates, rust inhibitors such as metal sulfonates, esters, amines, metal naphthenates, and succinic acid derivatives, extreme pressure agents such as phosphorus, zinc dithiophosphate, and organic molybdenum, oiliness improvers such as fatty acids and animal and vegetable oils, and metal deactivators such as benzotriazole.
  • a specific coating is formed on the inner ring 1, outer ring 2, and balls 3, but if the lubricating oil or base oil contains additives, the additive
  • the type of lubricating oil and base oil is not limited, and may be any of mineral oil, synthetic oil, and natural oil.
  • Mineral oil may be one that has been refined by a suitable combination of vacuum distillation, oil deasphalting, solvent extraction, hydrocracking, solvent dewaxing, sulfuric acid washing, clay refining, hydrorefining, and the like.
  • Synthetic oils include hydrocarbon oils, aromatic oils, ester oils, ether oils, and the like.
  • Natural oils include fat-and-oil oils such as beef tallow, lard, soybean oil, rapeseed oil, rice bran oil, coconut oil, palm oil, palm kernel oil, and the like, or hydrogenated products thereof.
  • There is also no limit to the viscosity but considering the lubricity of rolling bearings, a kinetic viscosity of 5 to 400 mm 2 /s at 40°C is preferable.
  • the specific coating is formed as the bearing rotates on at least one of the inner ring raceway surface 1a, the outer ring raceway surface 2a, and the rolling surfaces of the balls 3.
  • the rotation conditions of the bearing such as the rotation speed, temperature, preload, and rotation time, are controlled so as to achieve a desired film thickness, preferably 1 nm or more.
  • a plastic cage is used as the cage 4, and after the bearing is assembled, the rotation conditions of the bearing are controlled to stop the rotation when a predetermined film thickness is reached.
  • the base resin of the plastic cage is polyamide, and that it is filled with additive-free lubricating oil or a grease composition whose base oil is additive-free lubricating oil.
  • Test 1 A resin cage made of polyamide 66 and an iron cage were prepared as cages for ball bearings with designation number "608,” and test bearings were assembled using these cages. In addition, 1 mg of additive-free poly- ⁇ -olefin oil (kinetic viscosity: 130 mm 2 /s, 40°C) was used as the lubricant. A life test was then conducted on both test bearings using the test device 200 shown in FIG. 2.
  • the test bearing 210 rotatably supports the rotating shaft 220.
  • the rotating shaft 220 is rotated by a motor 230.
  • the rotating shaft 220 is connected to an LCR meter 250 via a rotating connector 240.
  • the rotating connector 240 is configured using, for example, a carbon brush, and the test bearing 210 is electrically connected to the LCR meter 250.
  • the angular frequency ⁇ and AC voltage V of the AC power source are input to the LCR meter 250, and the impedance of the test bearing 210 is output from the LCR meter 250 in response.
  • the thickness of the lubricating film is then found using information on the AC voltage V of the angular frequency ⁇ and the relative dielectric constant at the high frequency limit.
  • the test involved applying an alternating current of 0.2 V and 1 MHz frequency to the test device 200, and continuously rotating the test bearing 210 at 6,000 revolutions per minute while applying an axial load of 32 N, a radial load of 0 N, and a maximum contact load of 1.0 GPa to the test bearing 210, and determining the relationship between rotation time and the thickness of the lubricant film.
  • the outer ring temperature of the test bearing was set to 150°C, and rotation was stopped when the temperature rose by 10°C, as it was determined that seizure had occurred.
  • FIG. 3 shows the test results of a test bearing using an iron cage, where (A) is the change in outer ring temperature per rotation time t (min), (B) is the change in lubricant film thickness in the gap between the inner ring raceway surface and the ball rolling surface per rotation time t (min), and (C) is the change in impedance per rotation time t (min).
  • FIG. 4 shows the test results of a test bearing using a plastic cage, where (A) is the change in outer ring temperature per rotation time t (min), (B) is the change in lubricating coating thickness in the gap between the inner ring raceway surface and the ball rolling surface per rotation time t (min), and (C) is the change in impedance per rotation time t (min).
  • Test 2 A ball bearing with designation number "608" was assembled using a resin cage made of glass fiber-containing polyamide 66. 1 mg of additive-free poly- ⁇ -olefin oil (dynamic viscosity: 130 mm 2 /s, 40°C) was used as the lubricant. Using the test apparatus 200 shown in FIG. 2, an alternating current of 0.2 V and 1 MHz frequency was applied to the test apparatus 200, and the assembled ball bearing was subjected to an axial load of 32 N, a radial load of 0 N, and a maximum contact load of 1.0 GPa, and rotated continuously at 6000 rpm for 3500 minutes with the outer ring temperature at 150°C.
  • Tests 1 and 2 show that using a plastic cage results in a longer life than a metal cage, and that a specific coating derived from the constituent components of the plastic cage is formed as the bearing rotates.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
PCT/JP2024/019667 2023-05-30 2024-05-29 転がり軸受及びその製造方法 Ceased WO2024248027A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202480036695.0A CN121219502A (zh) 2023-05-30 2024-05-29 滚动轴承及其制造方法
JP2024565203A JP7740579B2 (ja) 2023-05-30 2024-05-29 転がり軸受及びその製造方法
EP24815508.7A EP4722550A1 (en) 2023-05-30 2024-05-29 Rolling bearing and method for producing same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2023088743 2023-05-30
JP2023-088743 2023-05-30

Publications (1)

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WO2024248027A1 true WO2024248027A1 (ja) 2024-12-05

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EP (1) EP4722550A1 (https=)
JP (1) JP7740579B2 (https=)
CN (1) CN121219502A (https=)
WO (1) WO2024248027A1 (https=)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6164523U (https=) * 1984-10-02 1986-05-01
JPH0988967A (ja) * 1995-09-29 1997-03-31 Ntn Corp プーリ及びプーリ用玉軸受
JPH11125248A (ja) * 1996-08-28 1999-05-11 Nippon Seiko Kk 転動装置
JP2014224608A (ja) 2009-05-21 2014-12-04 日本精工株式会社 転がり軸受及びその製造方法
JP2015017661A (ja) * 2013-07-11 2015-01-29 日本精工株式会社 転がり軸受
JP2015209936A (ja) 2014-04-28 2015-11-24 日本精工株式会社 転がり軸受
JP2022189424A (ja) 2021-06-11 2022-12-22 日本精工株式会社 転がり軸受の製造方法
JP2023088743A (ja) 2021-12-15 2023-06-27 積水化学工業株式会社 建物ユニットの上面雨仕舞構造および上面雨仕舞方法

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JPS6164523U (https=) * 1984-10-02 1986-05-01
JPH0988967A (ja) * 1995-09-29 1997-03-31 Ntn Corp プーリ及びプーリ用玉軸受
JPH11125248A (ja) * 1996-08-28 1999-05-11 Nippon Seiko Kk 転動装置
JP2014224608A (ja) 2009-05-21 2014-12-04 日本精工株式会社 転がり軸受及びその製造方法
JP2015017661A (ja) * 2013-07-11 2015-01-29 日本精工株式会社 転がり軸受
JP2015209936A (ja) 2014-04-28 2015-11-24 日本精工株式会社 転がり軸受
JP2022189424A (ja) 2021-06-11 2022-12-22 日本精工株式会社 転がり軸受の製造方法
JP2023088743A (ja) 2021-12-15 2023-06-27 積水化学工業株式会社 建物ユニットの上面雨仕舞構造および上面雨仕舞方法

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