WO2024063023A1 - Palier à roulement à lubrifiant solide - Google Patents

Palier à roulement à lubrifiant solide Download PDF

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Publication number
WO2024063023A1
WO2024063023A1 PCT/JP2023/033737 JP2023033737W WO2024063023A1 WO 2024063023 A1 WO2024063023 A1 WO 2024063023A1 JP 2023033737 W JP2023033737 W JP 2023033737W WO 2024063023 A1 WO2024063023 A1 WO 2024063023A1
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WO
WIPO (PCT)
Prior art keywords
solid lubricant
solid
rolling elements
bearing
rolling
Prior art date
Application number
PCT/JP2023/033737
Other languages
English (en)
Japanese (ja)
Inventor
康介 鈴木
晋也 中条
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
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Publication of WO2024063023A1 publication Critical patent/WO2024063023A1/fr

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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
    • 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
    • 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 solid-lubricated rolling bearing equipped with a solid lubricant for use in environments such as high temperatures and vacuums.
  • Solid lubricated rolling bearings are used in high-temperature environments, vacuum environments, etc. where grease or lubricating oil cannot be used as lubricants.
  • this type of solid lubricated rolling bearing those described in Patent Document 1 and Patent Document 2 are conventionally known. In either configuration, components are used to separate the rolling elements and the solid lubricant from each other in the circumferential direction, and the solid lubricant is interposed between the two rolling elements. When the solid lubricant slides on the rolling elements and raceway rings, the lubricant is transferred to the rolling elements and raceway rings, or lubricant powder is generated on the rolling elements and raceway rings to lubricate the inside of the bearing.
  • a substantially U-shaped regulating member is employed as a component that separates the rolling elements and the solid lubricant in the circumferential direction.
  • a retainer that holds the rolling elements and the solid lubricant sandwiched therein is used as a component that separates the rolling elements and the solid lubricant in the circumferential direction. For this reason, in Patent Documents 1 and 2, it is difficult to make the diameter of the solid lubricant larger than the rolling element, and the wear life of the solid lubricant may be shortened.
  • An object of the present invention is to provide a solid lubricated rolling bearing that can extend the wear life of the solid lubricant.
  • the solid lubricated rolling bearing of the present invention includes an inner ring, an outer ring, a plurality of rolling elements interposed between the inner ring and the outer ring, and a solid lubricant that separates the rolling elements in the circumferential direction.
  • the solid lubricant rolling bearing is configured such that a volume percentage of the solid lubricant occupying an internal space of the bearing between the inner ring and the outer ring is set to 40 to 60%, and the solid lubricant is applied to the inner diameter surface of the outer ring or It is guided by at least one of the outer diameter surfaces of the inner ring.
  • the solid lubricant separates the rolling elements in the circumferential direction and is guided on at least one of the inner diameter surface of the outer ring or the outer diameter surface of the inner ring.
  • the solid lubricant causes the rolling elements to be spaced apart in the circumferential direction and is held relative to the inner and outer rings. Therefore, a regulating member that separates the rolling elements and the solid lubricant in the circumferential direction and a retainer that holds the rolling elements and the solid lubricant relative to the inner and outer rings can be omitted. In this way, by omitting the regulating member and the retainer, the solid lubricant can be made larger and the volume ratio can be optimized.
  • the volume percentage of the solid lubricant occupying the bearing internal space between the inner ring and the outer ring is set to 40 to 60%.
  • the life of a solid lubricated rolling bearing corresponds to the wear life of the solid lubricant.
  • the volume ratio of the solid lubricant occupying the internal space of the bearing is higher than that of the conventional technology, so that the life of the solid lubricated rolling bearing is extended.
  • the solid lubricant has a ring-shaped annular part and a plurality of pillar parts extending in the axial direction from the annular part and arranged at equal intervals in the circumferential direction, and the solid lubricant has A pocket portion in which the rolling element is housed may be formed between the portions.
  • the distance between the column parts adjacent in the circumferential direction, that is, the pocket gap may be set to 1.02 to 1.10 times the diameter of the rolling element.
  • FIG. 1 is a sectional view showing a solid lubricated rolling bearing according to a first embodiment of the present invention. It is a perspective view showing the solid lubricated rolling bearing.
  • FIG. 1 is a sectional view showing a solid lubricated rolling bearing 1 according to a first embodiment of the present invention
  • FIG. 2 is a perspective view thereof.
  • the solid lubricated rolling bearing 1 is used in a high temperature atmosphere (for example, 300° C. to 350° C.) or a vacuum atmosphere where grease or lubricating oil cannot be used as a lubricant.
  • the solid lubricated rolling bearing 1 shown in FIG. 1 includes an outer ring 2, an inner ring 4, and rolling elements 6 interposed between the outer ring 2 and the inner ring 4.
  • balls are used as the rolling elements 6.
  • the rolling elements 6 are not limited to balls.
  • the number of rolling elements 6 is eight, but the number of rolling elements 6 is not limited to this.
  • the outer ring 2, the inner ring 4, and the rolling elements 6 are made of, for example, high carbon chromium bearing steel (SUJ2) treated with a manganese phosphate film.
  • SUJ2 high carbon chromium bearing steel
  • the materials, surface treatments, etc. of the outer ring 2, inner ring 4, and rolling elements 6 are not limited to these.
  • a raceway surface 2aa on which the rolling elements 6 roll is formed on the inner diameter surface 2a of the outer ring 2.
  • the raceway surface 2aa is a surface recessed radially outward from the inner diameter surface 2a, and is located in the axial center of the inner diameter surface 2a.
  • annular outer locking grooves 2ab, 2ab are formed at both axial ends of the inner diameter surface 2a of the outer ring 2.
  • the raceway surface 4aa is a surface that is recessed radially inward from the outer diameter surface 4a, and is located at the axial center of the outer diameter surface 4a.
  • annular inner locking grooves 4ab, 4ab are formed at both axial ends of the outer diameter surface 4a of the inner ring 4.
  • the solid lubricated rolling bearing 1 also includes shields 8, 8 at both ends in the axial direction.
  • the shields 8, 8 close the bearing internal space SP between the outer ring 2 and the inner ring 4 from both sides in the axial direction. That is, the shields 8, 8 prevent foreign matter from entering the bearing internal space SP.
  • the shield 8 is, for example, a plate material made of SPTE (tinplate) treated with a manganese phosphate film.
  • the material, surface treatment, etc. of the shield 8 are not limited to these.
  • the shield 8 has one end 8a (upper end in FIG. 1) supported by one of the inner and outer rings 4 and 2, and the other end 8b (lower end in FIG. 1) close to the other.
  • one end portion (upper end portion in FIG. 1) 8a is locked in the outer locking groove 2ab of the outer ring 2
  • the other end portion (lower end portion in FIG. 1) 8b is locked in the inner locking groove 4ab of the inner ring 4. is sliding.
  • the solid lubricated rolling bearing 1 further includes a solid lubricant 10.
  • a solid lubricant 10 slides on the rolling elements 6 and the inner and outer rings 4 and 2 during bearing rotation, the lubricant 10 is transferred to the rolling elements 6 and the inner and outer rings 4 and 2, or lubricant powder of the lubricant 10 is transferred to the rolling elements 6 and the inner and outer rings 4 and 2. is generated by adhering to the rolling elements 6 and the inner and outer rings 4 and 2, thereby lubricating the inside of the bearing.
  • the solid lubricant 10 of this embodiment is a lubricant in which electrographite is impregnated with aluminum phosphate. Electrographite has better heat resistance than carbon graphite, and the impregnated aluminum phosphate moderately suppresses wear of the lubricant, contributing to the long life of the bearing.
  • the material of the solid lubricant 10 is not limited to this.
  • the solid lubricant 10 has a ring-shaped annular portion 12 and a plurality of pillar portions 14 extending in the axial direction from the annular portion 12 and arranged at equal intervals in the circumferential direction. It is a so-called comb-shaped solid lubricant.
  • a pocket portion 16 is formed between adjacent pillar portions 14, 14, and the rolling element 6 is accommodated in the pocket portion 16. That is, the same number of pocket portions 16 as the rolling elements 6 are provided. Therefore, in this embodiment, eight pillar portions 14 and eight pocket portions 16 are provided.
  • the rolling elements 6 are spaced apart in the circumferential direction by the column portions 14 of the solid lubricant 10. Further, a pocket gap 18 exists between the columnar portion 14 and the rolling element 6.
  • the distance (circumferential spacing) d2 between the pillar portions 14, 14 is larger than the diameter d1 (FIG. 1) of the rolling element 6 (d2>d1).
  • the distance d2 between the circumferentially adjacent columnar parts 14, 14 is set to 1.02 to 1.10 times the diameter d1 of the rolling element 6 (1.02 ⁇ (d2/d1) ⁇ 1 .10).
  • the solid lubricant 10 is guided by the inner diameter surface 2a of the outer ring 2 and the outer diameter surface 4a of the inner ring 4.
  • the outer diameter surface 10a of the solid lubricant 10 is guided by the inner diameter surface 2a of the outer ring 2
  • the inner diameter surface 10b of the solid lubricant 10 is guided by the outer diameter surface 4a of the inner ring 4.
  • the rolling elements 6 are positioned relative to the outer ring 2 and the inner ring 4 by the solid lubricant 10.
  • the solid lubricant 10 also functions as a retainer that holds the rolling elements 6.
  • the solid lubricant 10 of this embodiment has both the function of separating the rolling elements 6 in the circumferential direction and the function of holding the rolling elements 6. This makes it possible to omit the parts that space the rolling elements and the solid lubricant in the circumferential direction (hereinafter referred to as "separating parts") and the retainer.
  • the solid lubricant 10 is guided on both the inner diameter surface 2a of the outer ring 2 and the outer diameter surface 4a of the inner ring 4, but only on one of the inner diameter surface 2a of the outer ring 2 and the outer diameter surface 4a of the inner ring 4. You may be guided by
  • the solid lubricant 10 can be made larger by omitting the spacer parts and the retainer.
  • the life of the solid lubricant rolling bearing corresponds to the wear life of the solid lubricant, and the larger the solid lubricant 10, the longer the wear life of the solid lubricant 10.
  • the volume ratio of the solid lubricant 10 to the volume of the bearing internal space SP between the outer ring 2 and the inner ring 4 is set to 40 to 60%.
  • the "volume of the bearing internal space SP" is the radial space between the outer ring 2 and the inner ring 4, and refers to the volume of the ring-shaped space between both axial end surfaces of the bearing 1.
  • Table 1 shows the evaluation results of "life of the solid lubricant 10" and "rotability of the bearing” when the size of the solid lubricant 10, that is, the volume ratio of the solid lubricant 10 occupying the bearing internal space SP, changes. It shows. “ ⁇ ” in the table means good, and “x” means bad.
  • the volume percentage of the solid lubricant 10 occupying the bearing internal space SP is preferably 40 to 60%.
  • Table 2 shows the evaluation results of "bearing rotational performance" when the size of the pocket clearance 18, that is, the ratio (d2/d1) of the distance d2 between the column portions 14, 14 to the diameter d1 of the rolling element 6, is changed.
  • ⁇ means good
  • ⁇ means somewhat good
  • ⁇ means poor.
  • the pocket clearance 18 is an example of a "negative clearance".
  • (d2/d1) was less than 1.00, slipping occurred between the rolling elements 6 and the solid lubricant 10, and the rotatability was not good.
  • (d2/d1) is 1.00 to 1.02, the rotatability was not bad, but because the pocket clearance 18 was small, there was large interference between the rolling elements 6 and the solid lubricant 10, and the rotatability was poor. It was not good.
  • (d2/d1) was 1.02 to 1.10, the rotatability was good.
  • the size (d2/d1) of the pocket gap 18 is preferably 1.02 to 1.10.
  • the solid lubricant 10 separates the rolling elements 6 in the circumferential direction and is guided by the inner diameter surface 2a of the outer ring 2 and the outer diameter surface 4a of the inner ring 4. That is, the solid lubricant 10 causes the rolling elements 6 to be spaced apart in the circumferential direction and is held relative to the inner and outer rings 4 and 2. Therefore, a spacing member that separates the rolling elements 6 and the solid lubricant 10 in the circumferential direction and a retainer that holds the rolling elements 6 and the solid lubricant 10 relative to the inner and outer rings 4 and 2 can be omitted. In this way, by omitting the spacing member and the retainer, the solid lubricant 10 can be made larger and the volume ratio can be optimized.
  • the life of the solid lubricant rolling bearing 1 corresponds to the wear life of the solid lubricant 10.
  • the volume ratio of the solid lubricant 10 occupying the bearing internal space SP is higher than in the conventional technology, so that the solid lubricated rolling bearing has a longer life.
  • the distance between the circumferentially adjacent columnar parts 14, 14, ie, the pocket gap 18, is set to 1.02 to 1.10 times the diameter of the rolling element 6.
  • the present invention is not limited to the above embodiments, and various additions, changes, or deletions can be made without departing from the gist of the present invention.
  • balls are used as the rolling elements 6, but cylindrical rollers or conical rollers may be used. Therefore, such materials are also included within the scope of the present invention.

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

Abstract

Un palier à roulement à lubrifiant solide (1) comprend une bague extérieure (2), une bague intérieure (4), une pluralité d'éléments de roulement (6) interposés entre la bague extérieure (2) et la bague intérieure (4), et un agent de lubrification solide (10) séparant les éléments de roulement (6) les uns des autres dans une direction circonférentielle. Un rapport volumique de l'agent lubrifiant solide (10) occupant un espace interne de palier entre la bague extérieure (4) et la bague intérieure (2) est défini entre 40 et 60 %. L'agent lubrifiant solide (10) est guidé sur au moins l'une d'une surface de diamètre interne (2a) de la bague extérieure (2) et d'une surface de diamètre externe (4a) de la bague intérieure (4).
PCT/JP2023/033737 2022-09-20 2023-09-15 Palier à roulement à lubrifiant solide WO2024063023A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-149358 2022-09-20
JP2022149358A JP2024044045A (ja) 2022-09-20 2022-09-20 固体潤滑転がり軸受

Publications (1)

Publication Number Publication Date
WO2024063023A1 true WO2024063023A1 (fr) 2024-03-28

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PCT/JP2023/033737 WO2024063023A1 (fr) 2022-09-20 2023-09-15 Palier à roulement à lubrifiant solide

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JP (1) JP2024044045A (fr)
WO (1) WO2024063023A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0320724U (fr) * 1989-07-07 1991-02-28
JPH0367717U (fr) * 1989-10-27 1991-07-02
JP2008025791A (ja) * 2006-07-25 2008-02-07 Jtekt Corp 玉軸受用保持器
JP2009138863A (ja) * 2007-12-07 2009-06-25 Jtekt Corp 軸受用保持器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0320724U (fr) * 1989-07-07 1991-02-28
JPH0367717U (fr) * 1989-10-27 1991-07-02
JP2008025791A (ja) * 2006-07-25 2008-02-07 Jtekt Corp 玉軸受用保持器
JP2009138863A (ja) * 2007-12-07 2009-06-25 Jtekt Corp 軸受用保持器

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Publication number Publication date
JP2024044045A (ja) 2024-04-02

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