WO2023026795A1 - Roulement à rouleaux et roulement à aiguilles - Google Patents

Roulement à rouleaux et roulement à aiguilles Download PDF

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Publication number
WO2023026795A1
WO2023026795A1 PCT/JP2022/029673 JP2022029673W WO2023026795A1 WO 2023026795 A1 WO2023026795 A1 WO 2023026795A1 JP 2022029673 W JP2022029673 W JP 2022029673W WO 2023026795 A1 WO2023026795 A1 WO 2023026795A1
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WO
WIPO (PCT)
Prior art keywords
roller bearing
rollers
column
holding member
roller
Prior art date
Application number
PCT/JP2022/029673
Other languages
English (en)
Japanese (ja)
Inventor
佳子 大村
秀司 伊藤
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 JP2021135821A external-priority patent/JP2023030599A/ja
Priority claimed from JP2021135819A external-priority patent/JP2023030597A/ja
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Priority to CN202280054286.4A priority Critical patent/CN117795215A/zh
Publication of WO2023026795A1 publication Critical patent/WO2023026795A1/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
    • F16C19/22—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
    • F16C19/24—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 radial load mainly
    • F16C19/26—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 radial load mainly 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
    • 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
    • F16C19/44—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
    • 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
    • F16C33/48—Cages for rollers or needles for multiple rows of rollers or needles

Definitions

  • the present invention relates to roller bearings and needle roller bearings.
  • roller bearing As a roller bearing, conventionally there is a roller bearing with a large load capacity that is used for decelerating the rotation of a hydraulic motor provided in construction machinery (Patent Document 1). That is, as shown in FIG. 20, the roller bearing described in Patent Document 1 has a plurality of rollers 1 arranged along the circumferential direction and held by a retainer 2 at regular intervals. .
  • the retainer 2 has two circular flanges 3a and 3b and a plurality of pillars 4 connecting the circular flanges 3a and 3b.
  • the needle roller 1 is housed in a pocket 5 formed between the .
  • the present invention is to improve the strength by increasing the cross-sectional area of the column portion by making the cross-sectional shape of the column portion of the holding member approximate to a trapezoid and effectively utilizing the space between the adjacent rollers. Further, it is an object of the present invention to provide a roller bearing and a needle roller bearing capable of improving the basic dynamic (static) load rating by increasing the number of rollers.
  • the roller bearing of the present invention has a pair of axially spaced annular portions and a plurality of pillars extending in the axial direction and connecting the annular portions.
  • a roller bearing having a holding member in which a roller is held in a pocket formed between adjacent pillars, wherein the holding member includes pillars facing each other in the circumferential direction such that the inner side of the pocket expands.
  • the opposing surface is an inclined surface, and 20° ⁇ 60°, where ⁇ is the inclination angle of the inclined surface, and the inclination angle is an angle formed with a radial line passing through the center of the pocket. It is.
  • the column facing surfaces facing each other along the circumferential direction are formed as inclined surfaces so that the inner side of the pocket expands. It is possible to set the cross-sectional area of the column to be relatively large even if it is arranged at Moreover, by setting the inclination angle of the inclined surface of the column facing surface to 20° ⁇ ⁇ ⁇ 60°, the space between the adjacent rollers can be effectively utilized.
  • direction thickness can be a thickness that stabilizes strength. That is, if ⁇ exceeds 60°, the plate thickness of the pillar (thickness in the radial direction of the pillar) may become too small, or the cross-sectional shape of the pillar may not be able to maintain a trapezoidal shape.
  • ⁇ is less than 20°, the width of the column must be reduced when forming the column in the space between the adjacent rollers, resulting in a decrease in the strength of the column.
  • the lower limit it is preferable to increase the cross-sectional area of the columnar portion as much as possible, and it is preferable to set the angle to about 20° in consideration of allowable variations during processing.
  • a corner formed between the annular portion and the column portion of the holding member is preferably an R-shaped curved surface portion.
  • the R shape of the portion located on the outer diameter side is set larger than the R shape of the central portion, or the R shape of the portion located on the inner diameter side of the curved surface portion is set to the R shape of the central portion.
  • the large R shape means that the radius of curvature is large, and as a result, the distance of the curved surface portion extending from the annular portion to the columnar portion is increased.
  • a second roller bearing of the present invention has a pair of axially spaced annular portions and a plurality of pillars extending in the axial direction and connecting the annular portions to each other.
  • a roller bearing having a holding member for holding the rollers in a pocket formed in the inner part of the pocket, wherein the holding member has a pillar-facing surface that faces along the circumferential direction as an inclined surface so that the inner side of the pocket expands.
  • the roller filling rate on the pitch circle of the rollers is 93% or more and less than 100%, and the column of the rollers and the holding member at the corresponding portion of the last clearance formed between the rollers adjacent to each other in the circumferential direction on the pitch circle.
  • B be the circumferential length of the column on the contact pitch circle with the part
  • A be the dimension between the rollers adjacent in the circumferential direction
  • rs be the dimension of the last clearance
  • D is the circumferential length of the column portion on the contact pitch circle at the location where the rollers adjacent in the circumferential direction come into contact
  • C is the dimension between the rollers adjacent in the circumferential direction.
  • C>D the roller filling rate
  • the final clearance is the clearance finally generated between the last roller and the first roller when the rollers adjacent to each other along the circumferential direction are assembled so as to be in contact with each other.
  • the roller pitch circle can be arranged on the outer diameter side of the roller pitch circle, or the inner diameter Even if it arrange
  • the pocket clearance is larger than the final clearance, the circumferential width of the column becomes smaller, and even if the specification reduces the load on the column, the holding member cannot withstand the load. may disappear.
  • the space provided between rollers adjacent in the circumferential direction (the space on the outer diameter side of the roller pitch circle and the space on the inner diameter side of the roller pitch circle) is By effectively utilizing it, the cross-sectional area of the column can be increased as much as possible. Moreover, it is possible to arrange the rollers to the same extent as in the so-called full roller state, in which there are portions in contact with rollers adjacent to each other in the circumferential direction.
  • the cross-sectional area of the column on the side corresponding to the one space area is 25% to 50% of the space area on either the outer diameter side or the inner diameter side of the pitch circle between the rollers adjacent in the circumferential direction. I prefer that one.
  • the cross-sectional area of the pillar can be stabilized in terms of strength, and contact with the pillar can be effectively suppressed. That is, when the cross-sectional area exceeds 50%, the pocket clearance ⁇ the final clearance, and the rollers and the column portion strongly interfere with each other.
  • the space area between the rollers may be on the outer diameter side of the roller pitch circle or on the inner diameter side of the roller pitch circle.
  • the space area may be on the pitch circle outer diameter side, and the column portion may be formed only on the pitch circle outer diameter side.
  • outer ring guide refers to positioning of the holding member by bringing the holding member into contact with the outer ring, and the outer surface serves as a guide surface and contacts the inner circumference of the outer ring.
  • the plate thickness of the column is 10% to 30% of the roller diameter.
  • the needle roller bearing of the present invention uses needle rollers as the rollers of the roller bearing. Therefore, in the present needle roller bearing, the cross-sectional area of the column portion can be set relatively large, and the thickness of the column portion (thickness in the radial direction of the column portion) can be set to a thickness that stabilizes strength. Therefore, a holding member is used. Therefore, by increasing the number of rollers, the basic dynamic (static) load rating of the bearing can be improved, and the strength is stable.
  • the number of rollers can be increased, the basic dynamic (static) load rating can be improved, and the strength of the column is not lowered.
  • FIG. 2 is an enlarged perspective view of a main portion of a holding member for a roller bearing according to the present invention
  • 1 is a simplified diagram of a roller bearing using a holding member for a first roller bearing of the present invention
  • FIG. FIG. 4 is a cross-sectional view of a main part of a holding member of the first roller bearing
  • FIG. 4 is a cross-sectional view of a main part of another holding member of the first roller bearing of the present invention
  • It is an enlarged plan view of the corner portion of the pocket.
  • It is an enlarged perspective view of a corner portion of the pocket.
  • FIG. 4 is a perspective view of a main part showing a holding member of the present invention in the middle of processing;
  • FIG. 4 is a perspective view of a main part showing a holding member of the present invention in the middle of processing
  • FIG. 11 is an enlarged cross-sectional view of a main part showing a pillar portion of the holding member during processing;
  • FIG. 4 is an enlarged cross-sectional view of a main part showing a post-machining of a column part;
  • FIG. 4 is an enlarged view of a main part of a holding member having a pocket having projections for preventing roller interference of the holding member;
  • FIG. 12 is a cross-sectional view of a main part of the holding member shown in FIG. 11;
  • FIG. 4 is a cross-sectional view of a main part of a holding member arranged on the inner diameter side of a roller pitch circle;
  • FIG. 5 is a simplified diagram of a portion of the second roller bearing in which a rear clearance is provided;
  • FIG. 4 is a simplified diagram of a portion where rollers are in contact with each other;
  • FIG. 4 is a cross-sectional view of a portion where rollers are in contact with each other;
  • FIG. 4 is a simplified diagram showing an inter-roller space formed between rollers adjacent in the circumferential direction;
  • FIG. 8 is a simplified diagram of a portion of another holding member of the second roller bearing of the present invention where the final clearance is provided;
  • FIG. 8 is a simplified view of a portion where rollers of another holding member of the second roller bearing of the present invention are in contact with each other;
  • FIG. 10 is a cross-sectional view of a conventional needle roller bearing;
  • FIG. 10 is a cross-sectional view of a retainer of a conventional needle roller bearing;
  • FIG. 10 is an enlarged cross-sectional view of a main part of a retainer of a conventional needle roller bearing;
  • FIG. 1 shows an enlarged perspective view of a main portion of a retaining member for a first roller bearing of the present invention.
  • This retaining member 10 includes a pair of axially spaced annular portions 11 and 12 and an axially extending The rollers 15 (see FIG. 2) are accommodated in pockets 14 formed between the adjacent pillars 13 .
  • the inner side of the pocket expands, that is, in the holding member 10 of the first roller bearing, the pocket 14 expands in the circumferential direction from the outer diameter side to the inner diameter side.
  • Slanted surfaces 16a and 16b are used as the pillar facing surfaces that face each other along the . Therefore, the cross-sectional shape of the column portion 13 is a shape that approximates a trapezoid.
  • the inclination angles ⁇ ( ⁇ 1, ⁇ 2) of the inclined surfaces 16a and 16b are 20° ⁇ ( ⁇ 1, ⁇ 2) ⁇ 60°.
  • the inclination angle is the angle formed with a radial line L passing through the center of the pocket.
  • Figures 14 to 16 also show a second roller bearing in which, again, the pillars are circumferentially opposed so that the inner side of the pocket expands, i.e., from the outer diameter to the inner diameter. Slanted surfaces 16a and 16b are used as the facing surfaces. Therefore, the cross-sectional shape of the column portion 13 is a shape that approximates a trapezoid. Further, the holding member 10 of the second roller bearing is arranged on the outer diameter side of the roller pitch circle P1.
  • the holding member 10 is formed into a molded product S by punching as shown in FIG.
  • the molded product S has annular portion-constituting portions 11A and 12A, and a plurality of column portion-constituting portions 13A connecting the annular portion-constituting portions 11A and 12A.
  • a pocket-constituting portion 14A is formed between. That is, as shown in FIG. 9, the pillar facing surfaces that face each other along the circumferential direction of the pillar are not inclined surfaces 16a and 16b, but end surfaces 17a and 17b extending in the radial direction.
  • the end surfaces 17a and 17b are cut by cutting or the like to cut off the inclined surfaces 16a and 16b.
  • the areas indicated by two-dot chain lines indicate the removed portions 21a and 21b.
  • the inclined surfaces 16a and 16b of the column portion 13 may be formed by press pressing (surface pressing).
  • the processing method of the inclined surfaces 16a and 16b is not limited to pressing, and cutting processing such as broaching and MC milling may be used depending on the production volume and production lead time. Furthermore, injection molding using a resin material or sintering processing using a powder material may be used if the strength is satisfied, and casting processing may be used if the size is relatively large. That is, the material of the holding member 10 may be metal or synthetic resin that has been conventionally used for the cage. ), etc.
  • the cross-sectional shape is triangular. If the cross-sectional shape of the column portion 13 becomes triangular in this way, the radial thickness T of the column portion 13 becomes small, and there is a possibility that the strength cannot be sufficiently maintained.
  • T1 the original plate thickness
  • T1>T2 the plate thickness after processing (after forming the inclined surface)
  • T1>T2 the plate thickness after processing (after forming the inclined surface)
  • the lower limit is about 20° in consideration of allowable variation during processing (during molding), and it is necessary to make the cross-sectional area of the column as large as possible while effectively using the space 30 between the adjacent rollers. is preferable.
  • Table 1 indicates x. Further, when ⁇ ( ⁇ 1) ( ⁇ 2) is 15° or less, the area H of the space 30 (the hatched space in FIG. 2) between the rollers adjacent in the circumferential direction can be effectively utilized to cannot be increased, and the strength of the column portion 13 cannot be sufficiently maintained. In this case, Table 1 indicates x. Therefore, as indicated by ⁇ in Table 1, it can be said that it is preferable to set the inclination angles ⁇ ( ⁇ 1) ( ⁇ 2) to 20° or more and 60° or less.
  • T/D the preferable ratio of the relationship (T/D) between the thickness of the holding member 10 (thickness in the radial direction of the column portion) T and the diameter of the roller (roller diameter) D
  • Table 2 shows T/D of less than 5%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, and 35% or more.
  • the rollers 15 and the column portion 13 interfere relatively strongly, and it is necessary to set the number of rollers to be reduced or to set the gap between the rollers large. , it may not be possible to improve the basic dynamic (static) load rating. Moreover, since it becomes necessary to reduce the width dimension in the circumferential direction of the holding member, there is a possibility that the strength of the column portion 13 cannot be sufficiently maintained. In this case, it is described as x in Table 2. Moreover, if the T/D is 5% or less, there is a possibility that the strength of the column portion 13 cannot be sufficiently maintained. In this case, it is described as x in Table 2. Therefore, as indicated by ⁇ in Table 2, the plate thickness (thickness in the radial direction of the column) T of the column 13 is 10% to 30% of the roller diameter (roller diameter) D (see FIG. 2). % is preferable.
  • the four corners between the annular portion 11 (12) and the column portion 13 are rounded curved surface portions 22 .
  • the R shape of the portion located on the outer diameter side is larger than the R shape of the central portion
  • the R shape of the portion located on the inner diameter side is larger than the R shape of the central portion. It is made larger than the R shape.
  • the large R shape means that the radius of curvature is large, and as a result, the distance of the curved surface portion 22 from the annular portion 11 (12) to the column portion 13 is increased.
  • the radius of curvature of the portion located on the outer diameter side is set larger than the radius of curvature of the central portion (thickness direction central portion 22c).
  • the radius of curvature of the portion located on the inner diameter side is set larger than the radius of curvature of the central portion (thickness direction central portion 22c).
  • the curvature radius of the outer diameter side portion 22a is R1
  • the curvature radius of the inner diameter side portion 22b is R2
  • the curvature radius of the central portion 22c in the thickness direction is R3, R1>R3 and R2>R3.
  • the stress generated in the state where the load is applied to the column portion 13 can be reduced, and the strength of the holding member 10 can be improved. Further, for example, by setting R1 ⁇ R2 and about 1.015 ⁇ (R1 ⁇ R2)/R3 ⁇ 1.5, it is possible to further reduce the generated stress in a state where the load is applied to the column portion 13, and the holding member 10 strength can be improved.
  • 1.015 ⁇ (R1 ⁇ R2)/R3 ⁇ 1.5 is the case where the rollers 15 come into contact with the radial center portions of the surfaces of the columns 14a and 14b.
  • the rollers 15 may be set closer to the inner diameter or outer diameter of the columns 14a and 14b. By doing so, the strength of the holding member 10 can be improved.
  • a projection 25 for preventing roller interference that bulges into the pocket is provided in the intermediate portion of the short side portion 24 of the pocket 14 in the annular portion 11 (12). Interference between the holding member 10 and the rollers 15 is effectively prevented by providing the interference prevention projections 25 on the rollers.
  • the holding member 10 is arranged on the outer diameter side of the roller pitch circle P, but the holding member 10 may be arranged on the inner diameter side of the roller pitch circle P. good.
  • the pocket 14 is expanded from the inner diameter side to the outer diameter side so that the inner side of the pocket expands, and the pillar facing surfaces facing along the circumferential direction are inclined surfaces 16a
  • the cross-sectional shape of the pillar portion 16b is a trapezoidal shape, and 20° ⁇ 60°, where ⁇ is the inclination angle of the inclined surfaces 16a and 16b.
  • the column facing surfaces facing each other along the circumferential direction are inclined surfaces 16a and 16b so that the inner side of the pocket expands. Even if it arrange
  • the plate thickness of the column 13 (thickness in the radial direction of the column) can be stabilized in terms of strength. It can be said. That is, if ⁇ exceeds 60°, the plate thickness of the column portion 13 (thickness in the radial direction of the column portion) may become too small, or the cross-sectional shape of the column portion may not maintain a trapezoidal shape. If .theta. is less than 20.degree., the width of the column 13 must be reduced when forming the column in the space between the adjacent rollers, resulting in reduced strength of the column. As for the lower limit, it is preferable to increase the cross-sectional area of the columnar portion as much as possible, and it is preferable to set the angle to about 20° in consideration of allowable variations during processing.
  • the number of rollers can be increased, the basic dynamic (static) load rating can be improved, and the strength of the column portion 13 is not lowered. Further, it is preferable that the thickness T of the columnar portion 13 (thickness in the radial direction of the columnar portion) be 10% to 30% of the diameter D of the roller. By setting in this manner, the strength of the column portion 13 is stabilized, and interference between the rollers 15 and the holding member 10 can be effectively prevented.
  • the corner between the annular portion 11 (12) and the column portion 13 is formed as an R-shaped curved surface portion 22 .
  • the R shape of the portion located on the outer diameter side is larger than the R shape of the central portion
  • the R shape of the portion located on the inner diameter side is made larger than the R shape of the central portion. That is, the radius of curvature of the portion located on the outer diameter side (outer diameter side portion 22a) is set larger than the radius of curvature of the central portion (thickness direction central portion 22c).
  • the radius of curvature of the portion located on the inner diameter side (inner diameter side portion 22b) is set larger than the radius of curvature of the central portion (thickness direction central portion 22c).
  • the curvature radius of the outer diameter side portion 22a is R1
  • the curvature radius of the inner diameter side portion 22b is R2
  • the curvature radius of the thickness direction central portion 22c is R3, R1>R3 and R2>R3.
  • the generated stress can be reduced when a load is applied to the column portion 13, and the strength of the holding member 10 can be improved.
  • R1 ⁇ R2 and about 1.015 ⁇ (R1 ⁇ R2)/R3 ⁇ 1.5 it is possible to further reduce the generated stress in a state where the load is applied to the column portion 13, and the holding member 10 strength can be improved.
  • 1.015 ⁇ (R1 ⁇ R2)/R3 ⁇ 1.5 is the case where the rollers 15 come into contact with the radial center portions of the surfaces of the columns 14a and 14b.
  • the rollers 15 may be set closer to the inner diameter or outer diameter of the columns 14a and 14b. By doing so, the strength of the holding member 10 can be improved.
  • the rollers adjacent in the circumferential direction may face each other with a gap, or may have a portion where the rollers adjacent in the circumferential direction come into contact with each other.
  • the cross-sectional area of the column portion 13 between the rollers adjacent in the circumferential direction is set to 25% to 50% of the area of the space 30 between the rollers adjacent in the circumferential direction.
  • the space 30 is a space indicated by cross hatching in FIG. 17, and in this case, it is a range on the outer diameter side of the roller pitch circle between the rollers adjacent along the circumferential direction.
  • the pillar portion 13 corresponding to the area of the space 30 is also provided on the outer diameter side of the pitch circle and corresponds to the cross-sectional area.
  • the space 30 is also within the range on the inner diameter side.
  • the radial thickness of the column portion 13 is preferably 10% to 30% of the roller diameter.
  • the area of the space 30 between the rollers adjacent in the circumferential direction is H
  • the cross-sectional area of the column portion 13 is S1
  • S1/H (%) is less than 20%, 20%, 25%, 30%, 40%, 50%, 55%, and 55%. It described in Table 3 about what exceeded.
  • Table 1 indicates x. If it is less than 20%, there is a possibility that the holding property of the rollers 15 is deteriorated. In this case, Table 1 indicates x. For this reason, the cross-sectional area of the pillars 13 between the rollers adjacent in the circumferential direction, which is indicated by ⁇ in Table 1, is set to 25% to 50% of the space area between the rollers adjacent in the circumferential direction. It is preferable to set
  • T /D the preferred ratio of the relationship (T/D) between the thickness of the holding member 10 (thickness in the radial direction of the column portion) T and the diameter of the roller (roller diameter) D is expressed as T /D is described in Table 4 for less than 5%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, and 35% or more.
  • the rollers 15 and the column portion 13 interfere relatively strongly, and it is necessary to set the number of rollers to be reduced or to set the gap between the rollers large. , it may not be possible to improve the basic dynamic (static) load rating. Moreover, since it becomes necessary to reduce the width dimension in the circumferential direction of the holding member, there is a possibility that the strength of the column portion 13 cannot be sufficiently maintained. In this case, it is indicated by x in Table 2. Moreover, if the T/D is 5% or less, there is a possibility that the strength of the column portion 13 cannot be sufficiently maintained. In this case, it is described as x in Table 4.
  • the plate thickness of the column portion 13 (thickness in the radial direction of the column portion) T is the roller diameter (roller diameter It can be said that it is preferable to set the diameter to 10% to 30% of D (see FIG. 2).
  • the holding member 10 was arranged on the outer diameter side of the roller pitch circle P1, but as shown in FIGS. It may be arranged on the side.
  • the pocket 14 is expanded from the inner diameter side to the outer diameter side, so that the inner side of the pocket is expanded, the column facing surfaces facing along the circumferential direction are inclined surfaces 16a and 16b, and the cross-sectional shape of the column is trapezoidal.
  • the shape is similar to Then, the circumferential length of the column portion 13 on the contact pitch circle P2 between the roller 15 and the column portion 13 at the position corresponding to the final clearance G formed between the rollers adjacent in the circumferential direction on the roller pitch circle P1.
  • the cross-sectional area of the column portion 22 between the rollers adjacent in the circumferential direction is set to 25% to 50% of the area of the space 30 between the rollers adjacent in the circumferential direction.
  • the space 30 is the space 30 and the range on the inner diameter side of the roller pitch circle between the rollers adjacent in the circumferential direction.
  • the radial thickness of the column portion 13 is preferably 10% to 30% of the roller diameter D1.
  • the column facing surfaces facing each other along the circumferential direction are inclined surfaces 16a and 16b so that the pocket inner side is enlarged, so that the roller pitch circle P1 is arranged on the outer diameter side of the roller pitch circle P1.
  • the cross-sectional area of the column portion can be set relatively large.
  • the space provided between the rollers adjacent in the circumferential direction (the space on the outer diameter side of the roller pitch circle P1 and the space on the inner diameter side of the roller pitch circle P1) ) can be effectively used to increase the cross-sectional area of the column as much as possible.
  • the number of rollers can be increased, the basic dynamic (static) load rating can be improved, and the strength of the column is not lowered.
  • the roller bearing can be of the outer ring guide type.
  • the term “outer ring guide” refers to positioning of the holding member 10 by bringing the holding member 10 into contact with the outer ring.
  • the roller bearing can be of an inner ring guide system.
  • the inner ring guide means positioning of the holding member 10 by bringing the holding member 10 into contact with the inner ring.
  • the corner between the annular portion 11 (12) and the column portion 13 is formed as a rounded curved surface portion 22 .
  • the R shape of the portion located on the outer diameter side is larger than the R shape of the central portion
  • the R shape of the portion located on the inner diameter side is made larger than the R shape of the central portion. That is, the radius of curvature of the portion located on the outer diameter side (outer diameter side portion 22a) is set larger than the radius of curvature of the central portion (thickness direction central portion 22c).
  • the radius of curvature of the portion located on the inner diameter side (inner diameter side portion 22b) is set larger than the radius of curvature of the central portion (thickness direction central portion 22c).
  • the curvature radius of the outer diameter side portion 22a is R1
  • the curvature radius of the inner diameter side portion 22b is R2
  • the curvature radius of the thickness direction central portion 22c is R3, R1>R3 and R2>R3.
  • the generated stress can be reduced when a load is applied to the column portion 13, and the strength of the holding member 10 can be improved.
  • R1 ⁇ R2 and about 1.015 ⁇ (R1 ⁇ R2)/R3 ⁇ 1.5 it is possible to further reduce the generated stress in a state where the load is applied to the column portion 13, and the holding member 10 strength can be improved.
  • 1.015 ⁇ (R1 ⁇ R2)/R3 ⁇ 1.5 is the case where the rollers 15 come into contact with the radial center portions of the surfaces of the columns 14a and 14b.
  • 15 may be set closer to the inner diameter or outer diameter of the pillars 14a and 14b. Accordingly, the strength of the holding member 10 can be improved.
  • the needle roller bearing of the present invention uses the holding member 10 (the holding member 10 for the first roller bearing or the holding member 10 for the second roller bearing). Therefore, in this needle roller bearing, the cross-sectional area of the column portion can be set relatively large, and the thickness of the column portion 13 (thickness in the radial direction of the column portion) is set to a thickness that stabilizes strength. The number of rollers is increased, the basic dynamic (static) load rating of the bearing is improved, and the strength is stable.
  • rollers may have portions in contact with rollers adjacent to each other in the circumferential direction.
  • the roller bearing is not limited to a needle roller bearing, and may be a cylindrical roller bearing, a tapered roller bearing, or the like.
  • the bearing is not limited to a single-row type, and may be a double-row type.
  • roller bearings for which this holding member is used are, for example, those used in general industrial machinery, but they can be used particularly for those requiring space saving and high load capacity. Can be used for robot mechanism parts, etc.
  • the roller bearing can be of the outer ring guide system.
  • the term “outer ring guide” refers to positioning of the holding member by bringing the holding member into contact with the outer ring, and the outer surface serves as a guide surface and contacts the inner circumference of the outer ring.
  • the roller bearing can be of the inner ring guide type.
  • the term “inner ring guide” refers to positioning of the holding member by bringing the holding member into contact with the inner ring.
  • a plurality of rollers arranged along the circumferential direction are held by a retainer at equal intervals.

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

Abstract

L'invention concerne un roulement à rouleaux comportant un élément de maintien doté d'une paire de parties annulaires espacées l'une par rapport à l'autre dans la direction axiale et une pluralité de parties de colonnes s'étendant dans la direction axiale et liant les parties annulaires l'une à l'autre et dans laquelle un rouleau est maintenu dans chacune des poches formées entre les parties de colonnes adjacentes. Dans l'élément de maintien, des surfaces opposées des parties de colonnes qui se font face suivant la direction sont formées comme des surfaces inclinées de telle sorte que les poches se dilatent vers le côté de la partie intérieure, et lorsque l'angle d'inclinaison de la surface inclinée est dénoté par θ, la relation 20°≤θ≤60° est satisfaite.
PCT/JP2022/029673 2021-08-23 2022-08-02 Roulement à rouleaux et roulement à aiguilles WO2023026795A1 (fr)

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CN202280054286.4A CN117795215A (zh) 2021-08-23 2022-08-02 滚子轴承和针状滚子轴承

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JP2021-135819 2021-08-23
JP2021-135821 2021-08-23
JP2021135821A JP2023030599A (ja) 2021-08-23 2021-08-23 ころ軸受および針状ころ軸受
JP2021135819A JP2023030597A (ja) 2021-08-23 2021-08-23 ころ軸受および針状ころ軸受

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006022821A (ja) * 2004-07-05 2006-01-26 Ntn Corp 円すいころ軸受
JP2007270852A (ja) * 2006-03-30 2007-10-18 Ntn Corp 液圧ポンプ用ころ軸受
JP2009210084A (ja) * 2008-03-06 2009-09-17 Nsk Ltd ラジアル針状ころ軸受
JP2018146041A (ja) * 2017-03-06 2018-09-20 Ntn株式会社 保持器付き針状ころおよびそれを備えた遊星歯車機構支持構造

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006022821A (ja) * 2004-07-05 2006-01-26 Ntn Corp 円すいころ軸受
JP2007270852A (ja) * 2006-03-30 2007-10-18 Ntn Corp 液圧ポンプ用ころ軸受
JP2009210084A (ja) * 2008-03-06 2009-09-17 Nsk Ltd ラジアル針状ころ軸受
JP2018146041A (ja) * 2017-03-06 2018-09-20 Ntn株式会社 保持器付き針状ころおよびそれを備えた遊星歯車機構支持構造

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