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WO2024053321A1 - Roulement à rouleaux - Google Patents

Roulement à rouleaux Download PDF

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Publication number
WO2024053321A1
WO2024053321A1 PCT/JP2023/028982 JP2023028982W WO2024053321A1 WO 2024053321 A1 WO2024053321 A1 WO 2024053321A1 JP 2023028982 W JP2023028982 W JP 2023028982W WO 2024053321 A1 WO2024053321 A1 WO 2024053321A1
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WO
WIPO (PCT)
Prior art keywords
roller
distance
spherical
inner ring
roller bearing
Prior art date
Application number
PCT/JP2023/028982
Other languages
English (en)
Japanese (ja)
Inventor
隆司 村井
聡希 中野
渓太 山田
真一 河田
晋 高野
Original Assignee
日本精工株式会社
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 日本精工株式会社 filed Critical 日本精工株式会社
Publication of WO2024053321A1 publication Critical patent/WO2024053321A1/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
    • F16C19/34—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
    • F16C19/38—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 two or more rows 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
    • F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
    • F16C23/06—Ball or roller bearings
    • F16C23/08—Ball or roller bearings self-adjusting
    • 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.
  • a roller bearing is a type of rolling bearing.
  • a roller bearing includes an inner ring and an outer ring that extend in the circumferential direction around a central shaft, rollers that are arranged between the inner ring and the outer ring, and a cage that is provided with pockets that hold the rollers (for example, (See Patent Document 1).
  • Patent Document 1 discloses a technique for reducing rotational noise of a roller bearing by setting the maximum diameter Dw of the roller and the minimum clearance C between the inner surface of the pocket and the inner surface of the pocket to values within a predetermined range.
  • Patent Document 1 does not disclose any description regarding longevity.
  • An object of the present invention is to provide a roller bearing that can have a long service life.
  • a roller bearing includes an inner ring and an outer ring that extend in the circumferential direction around the central shaft, a plurality of rollers that are arranged between the inner ring and the outer ring, and a roller bearing that extends in the axial direction of the central shaft.
  • a cage in which a plurality of extending columnar portions are provided along the circumferential direction, and the roller is held between two circumferentially adjacent columnar portions among the plurality of columnar portions;
  • Two pillars adjacent in the circumferential direction are a first pillar and a second pillar, a roller disposed between the first pillar and the second pillar is a first roller, and the central axis is the center of the roller.
  • the pitch circle is a circle passing through the axis of the first roller, then the first distance, which is the moving distance of the first roller along the circumference of the pitch circle when viewed from the axial direction, is The second distance, which is the separation distance between the first column part and the second column part along the circumference of the pitch circle, is greater than 0.5% and less than 1.8%.
  • the ratio of the first distance to the second distance is 0.5% or less, for example, when the inner ring is rotated relative to the outer ring, the temperature of the outer ring becomes too high and it becomes unusable.
  • the ratio of the first distance to the second distance is greater than 1.8%, for example, when the inner ring is rotated relative to the outer ring, the inner ring is likely to peel off, reducing the life of the roller bearing. From the above, by setting the first distance to be greater than 0.5% and less than 1.8% of the second distance, it is possible to extend the life of the roller bearing.
  • FIG. 1 is a partially cross-sectional perspective view schematically showing a self-aligning roller bearing according to an embodiment.
  • FIG. 2 is a schematic cross-sectional view of the self-aligning roller bearing of FIG. 1.
  • FIG. 3 is a schematic diagram of a part of the cage viewed from the outer peripheral side.
  • FIG. 4 is a plan view of the spherical roller according to the embodiment.
  • FIG. 5 is a schematic diagram of a part of the self-aligning roller bearing of FIG. 2 viewed from the axial direction.
  • FIG. 6 is a schematic diagram showing the spherical roller before and after movement in FIG. 5.
  • FIG. 5 is a schematic diagram showing the spherical roller before and after movement in FIG. 5.
  • FIG. 7 is a schematic diagram showing the first cage, the second cage, and the spherical rollers as viewed from the axial direction.
  • FIG. 8 is a schematic diagram comparing the amount of movement of the spherical rollers in the first cage and the second cage.
  • FIG. 9 is a partially cross-sectional perspective view schematically showing a single row cylindrical roller bearing according to another embodiment.
  • FIG. 10 is a plan view of the cylindrical roller of FIG. 9.
  • FIG. 11 is a bar graph summarizing the results of the examples.
  • FIG. 12 is a schematic diagram of a part of the cage according to another embodiment, viewed from the outer circumferential side.
  • FIG. 1 is a partially cross-sectional perspective view schematically showing a self-aligning roller bearing according to an embodiment.
  • FIG. 2 is a schematic cross-sectional view of the self-aligning roller bearing of FIG. 1.
  • FIG. 3 is a schematic diagram of a part of the cage viewed from the outer peripheral side.
  • FIG. 4 is a plan view of the spherical roller according to the embodiment.
  • the X1 side is one side in the axial direction of the inner ring 1 and the outer ring 2, and the X2 side is the other side in the axial direction.
  • the self-aligning roller bearing 100 includes an inner ring 1, an outer ring 2, spherical rollers 32, and a cage 4.
  • the inner ring 1 and the outer ring 2 have an annular shape extending in the circumferential direction around the central axis AX10.
  • a plurality of spherical rollers 32 are arranged in two rows with the axial center line CL of the inner ring 1 and outer ring 2 interposed therebetween.
  • rows of spherical rollers 32 arranged along the circumferential direction are formed on the X1 side (one side in the axial direction) and the X2 side (the other side) of the inner ring 1 and the outer ring 2 with the center line CL in between.
  • the axial centers AX20 of these two rows of spherical rollers 32 are inclined with respect to the central axis AX10.
  • the axis AX20 of the spherical roller 32 on the X1 side is inclined so as to approach the center axis AX10 as it goes toward the X1 side.
  • the axis AX20 of the spherical roller 32 on the X1 side is inclined radially inward as it goes toward the X1 side.
  • the axis AX20 of the spherical roller 32 on the X2 side is inclined toward the center axis AX10 as it goes toward the X2 side.
  • the axis AX20 of the spherical roller 32 on the X2 side is inclined radially inward as it goes to the X2 side.
  • an observation device such as a high-speed camera 500 is arranged on an extension of the axis AX20 of the spherical roller 32 on the X2 side. Since the high-speed camera 500 is arranged along the axis AX20, it is inclined with respect to the central axis AX10.
  • the high-speed camera 500 may be placed on the extension of the axis AX20 of the spherical roller 32 on the X1 side, or on the extension of the axis AX20 of the spherical roller 32 on the X1 side and the axis of the spherical roller 32 on the X2 side.
  • the high-speed cameras 500 may be placed on the extension lines of the heart AX20.
  • the inner ring 1 has an outer circumferential surface 11 and an inner circumferential surface 12, and the outer circumferential surface 11 is provided with raceway surfaces 13 and 14 of the spherical rollers 32.
  • the raceway surface 13 is the raceway surface of the spherical roller 32 on the X1 side.
  • the raceway surface 13 is inclined radially inward toward the X1 side.
  • the raceway surface 14 is the raceway surface of the spherical roller 32 on the X2 side.
  • the raceway surface 14 is inclined radially inward toward the X2 side.
  • the outer ring 2 has an outer circumferential surface 22 and an inner circumferential surface 21, and the inner circumferential surface 21 serves as the raceway surface 23 of the spherical rollers 32.
  • the inner circumferential surface 21 is a circular arc centered on the center O2.
  • the center O2 which is the center of curvature of the raceway surface 23 of the outer ring 2
  • the retainer 4 includes rim portions 43, 44, and 45 and a column portion 40.
  • the rim portion 43 extends annularly along the center line CL of the retainer 4. That is, the rim portion 43 is located at the center of the inner ring 1 and the outer ring 2 in the axial direction.
  • the rim part 44 is arranged on the X2 side with respect to the rim part 43, and the rim part 45 is arranged on the X1 side with respect to the rim part 43.
  • the rim portion 43 extends annularly along the center line CL.
  • the rim portions 44 and 45 extend substantially parallel to the rim portion 43.
  • the column portion 40 extends from the rim portion 43 toward the X1 side or the X2 side.
  • the column portion 40 is substantially orthogonal to the rim portions 43, 44, and 45.
  • the pillar portions 40 are arranged at equal intervals along the circumferential direction.
  • a pocket 46 is provided between a pair of circumferentially adjacent pillar parts 40, rim part 43, and rim part 44, and between a pair of circumferentially adjacent pillar parts 40, rim part 43, and rim part 45.
  • the spherical roller 32 is arranged in the pocket 46.
  • the column portion 40 on the X2 side is arranged between two column portions 40 adjacent in the circumferential direction on the X1 side.
  • the rollers 3 applied to the self-aligning roller bearing 100 are, for example, spherical rollers 32 shown in FIG. 4.
  • the outer peripheral surface 32a of the spherical roller 32 has a spherical shape, and the diameter at the center in the axial direction is larger than the diameter at the end in the axial direction.
  • the end face 32b of the spherical roller 32 in the axial direction of the axis AX20 has a plane along a second plane 230 orthogonal to the axis AX20.
  • the entire surface of the axial end surface 32b may be a plane along the second plane 230.
  • FIG. 5 is a schematic diagram of a part of the self-aligning roller bearing of FIG. 1 viewed from the axial direction.
  • FIG. 6 is a schematic diagram showing the spherical roller before and after movement in FIG. 5.
  • the spherical roller 32 when viewed from the axial direction of the center axis AX10, the spherical roller 32 is disposed between two circumferentially adjacent column parts 40.
  • the two pillar parts 40 adjacent to each other in the circumferential direction are, for example, the first pillar part 41 and the second pillar part 42.
  • FIG. 5 is a schematic diagram of a part of the self-aligning roller bearing of FIG. 1 viewed from the axial direction.
  • FIG. 6 is a schematic diagram showing the spherical roller before and after movement in FIG. 5.
  • the spherical roller 32 when viewed from the axial direction of the center axis AX10, the spherical roller 32 is disposed between two circumferentially adjacent column
  • a first column portion 41 is provided on one side in the circumferential direction, and a second column portion 42 is provided on the other side in the circumferential direction. Therefore, in other words, the spherical roller 32 is arranged between the first column part 41 and the second column part 42.
  • the spherical rollers 32 are also referred to as first rollers 30.
  • the first roller 30 either a spherical roller 32 or a cylindrical roller 31, which will be described later, can be used.
  • a circle passing through the axis AX20 of the spherical roller 32 centered on the central axis AX10 is defined as a pitch circle C1.
  • the circumference of the pitch circle C1 is drawn with a straight dashed-dotted line.
  • the separation distance between the first column part 41 and the second column part 42 along the circumference of the pitch circle C1 is a second distance L2. More specifically, the circumference of the pitch circle C1 between the radial center of the side surface 41a of the first column part 41 on the spherical roller 32 side and the radial center of the side surface 42a of the second column part 42 on the spherical roller 32 side.
  • the separation distance along the line is the second distance L2.
  • the center along the circumferential direction between the radial center of the side surface 41a and the radial center of the side surface 42a is the center O1
  • the radial center of the side surface 41a and the side surface 42a are centered around the center O1.
  • An imaginary circle C2 passing through the radial center of is shown by a broken line.
  • the side surface 41a of the first columnar section 41 and the side surface 42a of the second columnar section 42 are arcuate along the circumference of the virtual circle C2.
  • the spherical rollers 32 move along the circumference of the pitch circle C1 between the first column part 41 and the second column part 42. It is possible to move. Specifically, the spherical roller 32 is movable between the side surface 41a of the first column part 41 and the side surface 42a of the second column part 42. That is, when the inner ring 1 and the outer ring 2 rotate relative to each other, the spherical rollers 32 do not necessarily come into contact with the side surface 41a of the first column part 41 or the side surface 42a of the second column part 42.
  • the spherical roller 32 moves by the maximum distance, it comes into contact with both the side surface 41a of the first column part 41 and the side surface 42a of the second column part 42.
  • FIG. 6 when the spherical roller 32 is viewed from the axial direction, consider a case where the spherical roller 32 located at the position indicated by the solid line moves to the position indicated by the broken line. In this case, the first portion 33 of the outer circumferential surface 32a of the spherical roller 32 located at the position P1 indicated by the solid line moves to the first region 33 located at the position P2 indicated by the broken line. Therefore, the moving distance of the spherical roller 32 along the circumference of the pitch circle C1 (see FIG.
  • the moving distance of the spherical roller 32 is the first distance L1, which is the moving distance of the first portion 33, as shown in FIG.
  • the moving distance of the spherical roller 32 can be calculated by photographing the movement of the spherical roller 32 in the circumferential direction using an observation device such as the high-speed camera 500 shown in FIGS. 1 and 2, for example.
  • the high-speed camera 500 is arranged on an extension of the axis AX20 of the spherical roller 32, as shown in FIGS. 1 and 2.
  • the first distance L1 is greater than 0.5% and less than 1.8% of the second distance L2.
  • the value obtained by dividing the first distance L1 by the second distance L2 is greater than 0.005 and less than or equal to 0.018. If the ratio of the first distance L1 to the second distance L2 is 0.5% or less, for example, when the inner ring 1 is rotated relative to the outer ring 2, the temperature of the outer ring 2 becomes too high to be used. On the other hand, if the ratio of the first distance L1 to the second distance L2 is larger than 1.8%, for example, when the inner ring 1 is rotated relative to the outer ring 2, the inner ring 1 is likely to peel off and self-align. The life of the roller bearing 100 is reduced.
  • the first distance L1 is 1.65% or more and 1.8% or less with respect to the second distance L2.
  • the value obtained by dividing the first distance L1 by the second distance L2 is more preferably 0.0165 or more and 0.018 or less.
  • FIG. 7 is a schematic diagram showing the first cage, the second cage, and the spherical rollers as viewed from the axial direction.
  • FIG. 8 is a schematic diagram comparing the amount of movement of the spherical rollers in the first cage and the second cage.
  • the cage 4 can be, for example, a cage 4A and a cage 4B.
  • the first column portion 41A and the second column portion 42A of the cage 4A are arranged on the circumference of the pitch circle C1.
  • the first column portion 41B and the second column portion 42B of the retainer 4B are arranged radially inward of the self-aligning roller bearing 100 than the first column portion 41A and the second column portion 42A. That is, the distance between the radial center of the first column portion 41A and the second column portion 42A of the cage 4A and the center axis AX10 of the self-aligning roller bearing 100 is determined by PCD (Pitch Circle Diameter). ).
  • the distance between the radial center portions of the first column portion 41B and the second column portion 42B of the retainer 4B and the central axis AX10 of the self-aligning roller bearing 100 is smaller than the PCD.
  • a side surface 41Aa of the first column part 41A and a side surface 42Aa of the second column part 42A in the cage 4A are arcuate along the circumference of the virtual circle C2.
  • the side surface 41Ba of the first column part 41B and the side surface 42Ba of the second column part 42B in the cage 4B are also arcuate along the circumference of the virtual circle C2.
  • the side surface 42Aa of the second column part 42A of the cage 4A and the side surface 42Ba of the second column part 42B of the cage 4B are arranged on the circumference of the virtual circle C2. Therefore, when the column portions of the cage are arranged on the circumference of the virtual circle C2, the cage 4A and the cage 4B are compared to determine which one has a larger maximum movement distance of the spherical rollers 32.
  • the maximum movement distance L10 of the spherical rollers 32 held by the cage 4A and the maximum movement distance L20 of the spherical rollers 32 held by the cage 4B will be described. That is, the maximum value of the movement distance of the first portion 33 of the outer circumferential surface 32a of the spherical roller 32 explained in FIG. 6 is compared between the cage 4A and the cage 4B.
  • the spherical rollers 32 normally move within a range where they do not come into contact with the cage 4A.
  • the first portion 33A of the outer peripheral surface 32a of the spherical roller 32 located at the position P1 moves to the first portion 33A located at the position P2 and comes into contact with the retainer 4A.
  • position P2 is a position where the outer circumferential surface 32a of the spherical roller 32 contacts the side surface 42Aa of the second column portion 42A.
  • the maximum movement distance L10 is defined as distance a. That is, the maximum moving distance L10 (distance a) is the maximum distance that the spherical rollers 32 held by the cage 4A can move.
  • the spherical rollers 32 normally move within a range where they do not come into contact with the cage 4B.
  • the moving distance becomes maximum
  • the first portion 33B of the outer circumferential surface 32a of the spherical roller 32 located at the position P1 moves to the first portion 33B located at the position P2 and comes into contact with the retainer 4B.
  • position P2 is a position where the outer circumferential surface 32a of the spherical roller 32 contacts the side surface 42Ba of the second column portion 42B.
  • the spherical roller 32 moves along a straight line from position P1 to position P2.
  • the maximum movement distance L20 is defined as distance b.
  • the maximum moving distance L20 (distance b) is the maximum distance that the spherical rollers 32 held by the cage 4B can move. Therefore, below, the maximum movement distance L10 (distance a) when arranging the holder 4A is compared with the maximum movement distance L20 (distance b) when arranging the holder 4B.
  • intersection of the straight line connecting the axis AX20 and the first portion 33B at the position P1 and the retainer 4B is defined as the intersection 33C.
  • intersection angle between the straight line connecting the axial center AX20 and the first portion 33A at the position P1 and the straight line connecting the axial center AX20 and the first portion 33B at the position P1 is defined as an angle ⁇ .
  • a right triangle is formed by the intersection point 33C, the first portion 33B at position P1, and the first portion 33B at position P2.
  • Example 1 In Example 1, the lifespan (rolling life: long-term life) of the spherical roller bearing A was verified.
  • the cage used was the cage 4B described in FIG. 7. (Roughness condition) ⁇ Outer ring roughness: 0.15 um or less ⁇ Inner ring roughness: 0.1 um or less ⁇ Spherical roller roughness: 0.1 um or less
  • test conditions are as follows. ⁇ Test radial load: 45200N ⁇ Test axial load: 0N ⁇ Inner ring rotation speed: 1500min -1 ⁇ Lubrication method: JX Nippon Oil FBK oil RO68, forced supply circulation
  • Example 2 In Example 2, the lifespan (rolling life: long-term life) of the self-aligning roller bearing B was verified.
  • the cage used was the cage 4B described in FIG. 7. (Roughness condition) ⁇ Outer ring roughness: 0.1 um or less ⁇ Inner ring roughness: 0.1 um or less ⁇ Spherical roller roughness: 0.1 um or less
  • test conditions were the same as in Example 1.
  • Example 3 In Example 3, the life of the self-aligning roller bearing C was verified.
  • Example 2 The roughness conditions and test conditions were the same as in Example 2. That is, the third embodiment differs from the second embodiment only in the retainer.
  • Example 4 In Example 4, the lifespan (seizure life: short-term life) of the self-aligning roller bearing D was verified.
  • test conditions are as follows. ⁇ Test radial load: 75700N ⁇ Test axial load: 0N ⁇ Inner ring rotation speed: 1300, 1950, 2600, 3250min -1 ⁇ Lubrication method: Clean forced lubrication, general-purpose multi-purpose lubricant VG68
  • the temperature of the outer ring is preferably 70°C or lower, for example. However, in Example 4, this temperature is exceeded. As described above, the temperature of the outer ring of the self-aligning roller bearing D became too high, resulting in the result that it could not be used (long-term life test was not possible). Further, as a result of rotating the inner ring of the self-aligning roller bearing D and verifying the amount of movement of the spherical rollers, the ratio of the first distance L1 to the second distance L2 was 0.005 (0.5%).
  • FIG. 11 is a bar graph summarizing the results of the examples.
  • the actual life ratio of spherical roller bearing B was 3, and the actual life ratio of spherical roller bearing C was 4.26.
  • the actual lifespan ratio of the spherical roller bearing B is 1.82% and 1.65%, respectively
  • the ratio of the first distance L1 to the second distance L2 is 1.82% and 1.65%, respectively. It was confirmed in Examples that the ratio is preferably 1.8% or less.
  • the ratio of the first distance L1 to the second distance L2 in the self-aligning roller bearing D is 0.5% or less. Therefore, it was confirmed in the example that the ratio of the first distance L1 to the second distance L2 is preferably larger than 0.5%.
  • the self-aligning roller bearing (roller bearing) 100 is arranged between the inner ring 1 and the outer ring 2, which extend in the circumferential direction around the center axis AX10, and the inner ring 1 and the outer ring 2.
  • a plurality of spherical rollers 32 (rollers 3) and a plurality of columnar portions 40 extending in the axial direction of the central axis AX1 are provided along the circumferential direction, and two of the plurality of columnar portions 40 that are adjacent to each other in the circumferential direction are provided.
  • a retainer 4 in which the spherical rollers 32 are held between the column parts 40 is provided.
  • first roller 30 Two pillars 40 adjacent in the circumferential direction are referred to as a first pillar 41 and a second pillar 42, and a spherical roller 32 disposed between the first pillar 41 and second pillar 42 is referred to as a first roller 30.
  • the pitch circle C1 is a circle centered on the center axis AX10 and passing through the axis of the first roller 30
  • the distance the first roller 30 moves along the circumference of the pitch circle C1 when viewed from the axial direction is the pitch circle C1.
  • 1 distance L1 is greater than 0.5% and 1.8% with respect to the second distance L2, which is the separation distance between the first column part 41 and the second column part 42 along the circumference of the pitch circle C1. It is as follows.
  • the self-aligning roller bearing 100 when the inner ring 1 and the outer ring 2 rotate relative to each other, the spherical rollers 32 in the cage 4 rotate. Therefore, slipping and friction occur between the inner ring 1, outer ring 2, or cage 4 and the spherical rollers 32. This friction may, for example, cause damage such as peeling to the inner ring 1 or outer ring 2, or cause the temperature of the inner ring 1 or outer ring 2 to become high, reducing the life of the self-aligning roller bearing 100.
  • the ratio of the first distance L1 to the second distance L2 is 0.5% or less, for example, when the inner ring 1 is rotated relative to the outer ring 2, the temperature of the outer ring 2 becomes too high and it cannot be used. Sometimes it disappears.
  • the ratio of the first distance L1 to the second distance L2 is greater than 1.8%, for example, when the inner ring 1 is rotated relative to the outer ring 2, there may be slippage between the rollers in the load area and the inner ring 1. occurs more frequently, and the inner ring 1 is more likely to peel off, reducing the lifespan of the spherical roller bearing 100.
  • FIG. 9 is a partially cross-sectional perspective view schematically showing a single row cylindrical roller bearing according to another embodiment.
  • FIG. 10 is a plan view of the cylindrical roller of FIG. 9.
  • the single-row roller bearing 100A includes an inner ring 1A, an outer ring 2A, cylindrical rollers (first roller 30, roller 3) 31, and a cage 4C.
  • the inner ring 1A and the outer ring 2A have an annular shape extending in the circumferential direction around the central axis AX10.
  • the outer circumferential surface of the inner ring 1A serves as the raceway surface of the cylindrical rollers 31, and the inner circumference of the outer ring 2A serves as the raceway surface of the cylindrical rollers 31.
  • the cage 4C is provided with a plurality of column parts 40A arranged in the circumferential direction. Cylindrical rollers 31 are arranged between a pair of circumferentially adjacent column parts 40A. A gap is provided in the circumferential direction between the cylindrical roller 31 and the pillar portion 40A.
  • the cylindrical rollers 31 are movable between the pair of pillar portions 40A along the circumferential direction of the roller bearing 100A. Furthermore, an observation device such as the high-speed camera 500 is arranged along the axis AX20 of the cylindrical rollers 31 on the side of the roller bearing 100A.
  • the outer peripheral surface 31a of the cylindrical roller 31 has a cylindrical surface extending in the circumferential direction around the axis AX20. That is, the outer peripheral surface 31a of the cylindrical roller 31 has the same diameter at any position in the axial direction.
  • the single row roller bearing 100A This makes it possible to extend the service life of the first distance L1 to be larger than 0.5% and 1.8% or less with respect to the second distance L2, the single row roller bearing 100A This makes it possible to extend the service life of the first distance L1 to be larger than 0.5% and 1.8% or less with respect to the second distance L2, the single row roller bearing 100A This makes it possible to extend the service life of the first distance L1 to be larger than 0.5% and 1.8% or less with respect to the second distance L2, the single row roller bearing 100A This makes it possible to extend the service life of the first distance L1 to be larger than 0.5% and 1.8% or less with respect to the second distance L2, the single row roller bearing 100A This makes it possible to extend the service life of the first distance L1 to be larger than 0.5% and 1.8% or less with respect to the second distance L2, the single row roller bearing 100A This makes it possible to extend the service life of the first distance L1 to be larger than 0.5% and 1.8% or less with respect to the second distance L2, the single row roller bearing 100A
  • FIG. 12 is a schematic diagram of a part of the cage according to another embodiment, viewed from the outer circumferential side.
  • the retainer 4D includes a rim portion 43 and a column portion 40.
  • the rim portion 43 extends annularly along the center line CL of the retainer 4D. That is, the rim portion 43 is located at the center of the inner ring 1 and the outer ring 2 in the axial direction.
  • the column portion 40 extends from the rim portion 43 toward the X1 side or the X2 side.
  • the column portion 40 is substantially perpendicular to the rim portion 43.
  • the pillar portions 40 are arranged at equal intervals along the circumferential direction. In other words, the annular rim portion 43 extends in the circumferential direction and is connected to the plurality of pillar portions 40 .
  • pockets 46 are provided between a pair of circumferentially adjacent pillars 40 and rim 43 and between a pair of circumferentially adjacent pillars 40 and rim 43.
  • the column portion 40 on the X2 side is arranged between two column portions 40 adjacent in the circumferential direction on the X1 side.
  • the rollers 3 applied to the self-aligning roller bearing 100 are, for example, spherical rollers 32 shown in FIG. 4. The spherical roller 32 is arranged in the pocket 46. As shown in FIG.
  • the end surface 32b of the spherical roller 32 in the axial direction of the axis AX20 has a second plane 230 orthogonal to the axis AX20.
  • the entire surface of the axial end surface 32b may be the second plane 230.
  • the rim portion 43 has an axial side surface 430.
  • Side surface 430 includes side surfaces 431 and 432.
  • Side 430 faces pocket 46.
  • the side surface 431 is located on the X1 side with respect to the center line CL when the rim portion 43 is viewed from the radial direction.
  • the side surface 432 is located on the X2 side with respect to the center line CL when the rim portion 43 is viewed from the radial direction.
  • the side surfaces 431 and 432 have a protrusion 433 that protrudes toward the X1 side or the X2 side (that is, in the axial direction).
  • Projection 433 includes projections 434 and 435.
  • the protruding portion 434 protrudes from the side surface 431 toward the X1 side.
  • the protruding portion 435 protrudes from the side surface 432 toward the X2 side.
  • the protrusion 433 has an end face 433a in the axial direction.
  • a plane perpendicular to the central axis AX10 is defined as a first plane 200.
  • the first plane 200 includes a first plane 210 located on the X1 side of the center line CL, and a first plane 220 located on the X2 side of the center line CL.
  • the axial end surface 433a has a first plane 200. That is, the axial end surface 433a of the protrusion 434 located on the X1 side with respect to the center line CL has the first plane 210 and can come into contact with the axial end surface 32b of the spherical roller 32 (see FIG. 4). be.
  • the axial end surface 433a of the protrusion 435 located on the X2 side with respect to the center line CL has a first plane 220, and can come into contact with the axial end surface 32b of the spherical roller 32 (see FIG. 4). be. More specifically, the entire surface of the axial end surface 433a of the protrusion 434 is the first plane 210, and the entire surface of the axial end surface 433a of the protrusion 435 is the first plane 220.
  • the retainer 4 includes a plurality of pillar parts 40 and an annular rim part 43 that extends in the circumferential direction and connects to the plurality of pillar parts 40, and has a rim
  • the portion 43 has a protruding portion 433 that protrudes in the axial direction from the axial side surface 430 of the rim portion 43, and the axial end surface 433a of the protruding portion 433 has a first plane 200 orthogonal to the central axis AX10.
  • the spherical roller (first roller) 32 has an end face 32b in the axial direction, the end face 32b in the axial direction has a second plane 230 extending along the first plane 200, and the protrusion 433 of the rim part 43
  • the axial end surface 433a can be brought into contact with the axial end surface 32b of the spherical roller (first roller) 32.
  • the present embodiment is better than the spherical roller 32 and the protrusion 433 of the rim part 43.
  • the difference in rotational speed (circumferential speed) between the spherical rollers 32 and the inner ring 1 of the bearing is smaller, and as a result, the slippage of the spherical rollers 32 with respect to the inner ring 1 is reduced.
  • the actual life time which is the time it takes for peeling to occur, becomes longer.
  • the entire surface of the end surface 433a in the axial direction of the protrusion 433 is the first plane 200. According to this, since the frictional force between the spherical rollers 32 and the protrusion 433 of the rim portion 43 becomes even larger, the slippage of the spherical rollers 32 against the inner ring 1 becomes smaller, and as a result, it is the time when the inner ring 1 peels off. Actual life time becomes longer.

Landscapes

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

Abstract

L'invention concerne un roulement à rouleaux qui comprend : une bague interne et une bague externe s'étendant dans une direction circonférentielle autour d'un axe central ; une pluralité de rouleaux disposés entre la bague interne et la bague externe ; et une cage dans laquelle une pluralité de piliers s'étendant dans une direction axiale de l'axe central sont disposés le long de la direction circonférentielle, et le rouleau est maintenu entre deux piliers circonférentiellement adjacents de la pluralité de piliers. Lorsque les deux piliers circonférentiellement adjacents sont définis comme étant un premier pilier et un second pilier, le rouleau disposé entre le premier pilier et le second pilier est défini comme étant un premier rouleau, et un cercle centré sur l'axe central et passant à travers le centre axial du premier rouleau est défini comme étant un cercle primitif, une première distance qui est une distance de déplacement du premier rouleau le long de la circonférence du cercle primitif lorsqu'elle est vue depuis la direction axiale, est supérieure à 0,5 % et inférieure ou égale à 1,8 % par rapport à une seconde distance qui est une distance de séparation entre le premier pilier et le second pilier le long de la circonférence du cercle primitif.
PCT/JP2023/028982 2022-09-08 2023-08-08 Roulement à rouleaux WO2024053321A1 (fr)

Applications Claiming Priority (2)

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JP2022143151 2022-09-08
JP2022-143151 2022-09-08

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WO2024053321A1 true WO2024053321A1 (fr) 2024-03-14

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007127167A (ja) * 2005-11-02 2007-05-24 Nsk Ltd 保持器付自動調心ころ軸受

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007127167A (ja) * 2005-11-02 2007-05-24 Nsk Ltd 保持器付自動調心ころ軸受

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