JP2019184019A - Self-aligning roller bearing - Google Patents

Abstract

To provide a self-aligning roller bearing capable of preventing leakage of grease from an inner peripheral portion of an outer ring while suppressing abrasion of a lip of a seal.SOLUTION: Double row spherical rollers 4 are respectively assembled between a spherical raceway 5 of an outer ring 2 and each of double raw raceways 10, 10 of an inner ring 3, the spherical roller 4 of each raw is retained by two retainers 13, 13, a first seal 6 is retained by axial both end portions of an inner peripheral portion of the outer ring 2, and a lip portion 20 of the first seal 6 is kept into slide-contact with an outer peripheral portion of an outer annular portion 15 of the retainer 13. A second seal 7 is retained by an axial outer end portion of an outer annular portion 15 of the retainers 13, and a lip portion 23 of the second seal 7 is kept into slide-contact with an axial outer end portion of a flange 11 of an outer peripheral portion of the inner ring 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a self-aligning roller bearing incorporated in a rotation support portion of various industrial machine devices.

  In general, a large load is applied to the rotating shaft support portion of various industrial machines such as construction machines, steel facilities, and wind power generators. For this reason, self-aligning roller bearings are often used as roller bearings that have a high ability to apply radial loads, axial loads in both directions, and composite loads thereof, and can receive vibration and impact loads.

  As this self-aligning roller bearing, for example, an inner ring having a pair of spherical raceways in two rows, an outer ring having a spherical raceway, and a double row spherical roller interposed between the spherical raceway of the outer ring and both spherical raceways of the inner ring And a pair of cage-shaped cages in which the spherical rollers in each row are equally arranged in the circumferential direction are known.

  In such a self-aligning roller bearing, the outer ring of the outer ring is used in poor conditions such as a pinch roll of a continuous casting apparatus, a cast guide roll, etc. One with seals at both ends of the inner periphery is recommended.

  The seal has an annular cored bar and an elastic body made of synthetic rubber that is integrally fixed to the cored bar, and a lip is formed on the inner peripheral portion of the elastic body. The seal is attached by press-fitting to the inner periphery of the outer ring, and the lip is in sliding contact with the end of the outer periphery of the inner ring.

  A self-aligning roller bearing provided with a seal is normally in a state in which the lip of the seal is in sliding contact with the outer peripheral surface of an inner ring which is a rotating wheel. For this reason, there is a problem that the wear of the lip progresses due to an increase in the rotational speed of the inner ring with respect to the outer ring, which is a stationary ring, and the bearing life is reduced.

  Therefore, a self-aligning roller bearing intended to reduce the wear of the lip has been proposed (see Patent Document 1). As shown in FIGS. 5 and 6, the self-aligning roller bearing described in Patent Document 1 includes a double row spherical roller between a spherical raceway 31 of the outer ring 30 and a pair of spherical raceways 33 of the two rows of the inner ring 32. 34, the spherical rollers 34 in each row are held at equal intervals in the circumferential direction by a pair of cage-shaped cages 35, 35, and a seal 40 is placed on the annular portion 36 on the axially outer side of each cage-type cage 35. It is fixed.

  The seal 40 includes an annular cored bar 41 and an elastic body 42 made of an elastomer fixed integrally to the cored bar 41, and an outer lip 43 is formed on the outer peripheral portion of the elastic body 42. An inner lip 44 is formed on the inner peripheral portion of 42.

  The core metal 41 is fixed to the annular portion 36 of the cage retainer 35 with screws 45. The outer lip 43 is in sliding contact with the outer side of the inner ring 32 in the axial direction, and the inner lip 44 is in sliding contact with the outer side of the inner ring 32 in the axial direction. Then, grease is sealed in an annular bearing space formed between the outer ring 30 and the inner ring 32.

  When the inner ring 32 rotates and the outer ring 30 stops, the revolution speed of the plurality of spherical rollers 34 in each row, that is, the rotation speed of the cage retainer 35 is smaller than the rotation speed of the inner ring 32. For this reason, the seal 40 fixed to the annular portion 36 of the cage retainer 35 rotates at a rotational speed smaller than that of the inner ring 32.

  In the seal 40 that rotates in this way, the outer lip 43 that is in sliding contact with the inner peripheral portion of the outer ring 30 and the inner lip 44 that is in sliding contact with the outer peripheral portion of the inner ring 32 are restrained from progressing wear and prevent a reduction in bearing life. can do.

DE102012207745A1

  Incidentally, in the self-aligning roller bearing described in Patent Document 1, grease is sealed in an annular bearing space formed between the outer ring 30 and the inner ring 32. The grease in the bearing space may be blown to the inner periphery of the outer ring 30 by centrifugal force as the inner ring 32 rotates.

  Since the seal 40 has the outer lip 43 that is in sliding contact with the inner peripheral portion of the outer ring 30, the grease blown to the inner peripheral portion of the outer ring 30 is from between the outer lip 43 and the inner peripheral portion of the outer ring 30. There was a risk of leakage.

  Accordingly, the problem to be solved by the present invention is to provide a self-aligning roller bearing that prevents leakage of grease from the inner peripheral portion of the outer ring while suppressing wear of the lip of the seal.

  In order to solve the above problems, the present invention includes an outer ring having a spherical track on the inner periphery, an inner ring having a double row track on the outer periphery, a spherical track of the outer ring, and a double row track of the inner ring. A double-row spherical roller incorporated between the two rollers, two cages for holding the spherical roller for each row, and an annular first roller that blocks both axial sides between the inner peripheral portion of the outer ring and the cage. An annular second seal that closes both sides in the axial direction between the retainer and the outer peripheral portion of the inner ring, and an inner annular portion in which each of the retainers is positioned on the inner side in the axial direction; An outer annular portion located on the outer side, and a plurality of pillars disposed between the inner annular portion and the outer annular portion, wherein the first seal is axially opposite ends of the inner peripheral portion of the outer ring. A lip portion that is slidably contacted with the outer peripheral portion of the outer annular portion of the cage, and Is held on one of the inner circumferential part of the outer annular part of the cage or the axially opposite sides of the outer circumferential part of the inner ring, and the inner circumferential part of the outer annular part of the cage or the outer circumferential part of the inner ring. A configuration having a lip portion that is in sliding contact with the other of both axial sides can be employed.

  In this configuration, when the inner ring is rotating and the outer ring is stationary, each cage rotates in the same direction as the inner ring at a rotational speed smaller than the rotational speed of the inner ring. A 1st seal | sticker is hold | maintained at the axial direction both ends of the inner peripheral part of an outer ring | wheel, and a lip | rip part contacts the outer peripheral part of the outer side annular part of a holder | retainer. For this reason, the lip portion of the first seal is in sliding contact with the outer peripheral portion of the outer annular portion of the cage that rotates at a rotation speed smaller than the rotation speed of the inner ring.

  Further, the inner ring rotates relative to the cage by a rotational speed difference between the rotational speed of the inner ring and the rotational speed of the cage. The second seal is held on the one side, and the lip portion is in sliding contact with the other side. For this reason, the second seal is rotated by a rotational speed difference between the rotational speed of the inner ring and the rotational speed of the cage, and the lip portion is in sliding contact with the other.

  Furthermore, the grease sealed in the bearing space formed between the outer peripheral part of the inner ring and the inner peripheral part of the outer ring may be blown to the inner peripheral part of the outer ring by centrifugal force as the inner ring rotates. Since the first seal is held at both ends in the axial direction of the inner peripheral portion of the outer ring, leakage of grease that is blown to the inner peripheral portion of the outer ring is prevented.

  The outer ring of the inner ring has a collar formed on both sides in the axial direction, the outer annular part of the cage is formed to extend radially inward, and the inner circumferential part of the outer annular part is formed on the collar. It is in a state opposed to the radial direction, and has a second seal mounting portion for holding the second seal at the axially outer end of the inner peripheral portion of the outer annular portion of each of the cages, The structure which has the 2nd seal groove part which the lip | rip part of said 2nd seal slides to the axial direction outer end part of the said collar can be employ | adopted.

  The outer ring of the inner ring has a flange formed on both sides in the axial direction, the outer ring part of the cage is formed to extend radially inward, and the inner ring part of the outer ring part is A second seal in which the lip portion of the second seal slides on the outer end in the axial direction of the inner peripheral portion of the outer annular portion of each of the cages in a state of opposing the collar in the radial direction. A configuration having a groove portion and having a second seal mounting portion for holding the second seal at the axially outer end portion of the collar can be adopted.

  According to the above configuration, the cage is guided to the inner ring, and the axially both sides between the cage and the outer circumference of the inner ring are sealed by the second seal using the collar of the outer circumference of the inner ring and the outer annular portion of the cage. Can be closed.

  In the above configuration, the outer circumferential portion of the outer annular portion of the cage is tapered such that the outer circumferential portion of the outer annular portion of the cage is inclined inward in the radial direction toward the outer side in the axial direction. A configuration having a radius of curvature around the center of the bearing and having a circular arc shape protruding outward in the radial direction can be employed.

  In this invention, since the lip portion of the first seal is in sliding contact with the outer peripheral portion of the outer annular portion of the cage that rotates at a rotational speed smaller than the rotational speed of the inner ring, the seal is in contact with the outer peripheral portion of the outer ring Compared with the case where it hold | maintains between, the abrasion of the lip | rip part of a 1st seal | sticker can be suppressed.

  Further, the second seal rotates at a rotational speed difference between the rotational speed of the inner ring and the rotational speed of the cage, and the lip is in sliding contact with the other. Thereby, compared with the case where a seal is hold | maintained between the inner peripheral part of an outer ring | wheel, and the outer peripheral part of an inner ring | wheel, abrasion of the lip | rip part of a 2nd seal can be suppressed.

  Furthermore, since the first seal is held at both ends in the axial direction of the inner peripheral portion of the outer ring, leakage of grease that is blown to the inner peripheral portion of the outer ring by centrifugal force is prevented.

Longitudinal sectional view of the self-aligning roller bearing of the first embodiment according to the present invention Longitudinal sectional view of the main part of the spherical roller bearing Longitudinal sectional view of the main part of the self-aligning roller bearing of the modified example of the first embodiment Longitudinal sectional view of the main part of the self-aligning roller bearing of the second embodiment Longitudinal section of a conventional spherical roller bearing Longitudinal sectional view of the main part of the spherical roller bearing

  Hereinafter, a self-aligning roller bearing according to a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the self-aligning roller bearing 1 according to this embodiment includes an outer ring 2, an inner ring 3 disposed inside the outer ring 2, and a spherical roller incorporated between the outer ring 2 and the inner ring 3. 4 and two cages 13 and 13 for holding the spherical roller 4.

  Further, the self-aligning roller bearing 1 includes a first seal 6 that closes both sides in the axial direction between the inner peripheral portion of the outer ring 2 and the cage 13, and an axial direction between the retainer 13 and the outer peripheral portion of the inner ring 3. A second seal 7 that closes both sides is provided, and grease is sealed in a bearing space formed between the outer ring 2 and the inner ring 3.

  Here, the “circumferential direction” refers to a circumferential direction around the center axis of the bearing unless otherwise specified. Unless otherwise specified, the direction along the bearing central axis is simply referred to as “axial direction”, and the direction perpendicular to the central axis is simply referred to as “radial direction”.

  The outer ring 2 is composed of an integral annular part. The outer ring 2 has a spherical track 5 formed on the inner peripheral portion and first seal mounting portions 8 formed on both ends of the spherical track 5 in the axial direction. The first seal mounting portion 8 has a groove shape formed over the entire circumference in the radially outward direction.

  The outer ring 2 has an oil supply hole 9 penetrating from the outer peripheral surface thereof to the spherical track 5. A plurality of oil supply holes 9 are provided in the circumferential direction at the center in the axial direction of the outer ring 2.

  The inner ring 3 is a double-row raceway ring having two double-row raceways 10 and 10 on the outer periphery. The outer peripheral part of the inner ring 3 has a collar 11 formed on both sides in the axial direction, and a second seal groove part 12 formed on the outer end part in the axial direction of the collar 11.

  The second seal groove portion 12 is formed in a stepped shape that is recessed radially inward from the outer peripheral portion of the collar 11, and the outer peripheral surface is a cylindrical surface.

  Between each of the tracks 10, 10 and the spherical track 5 of the outer ring 2, a plurality of spherical rollers 4 arranged at equal intervals in the circumferential direction are incorporated in a double row, and the plurality of spherical rollers 4 for each row are cages 13, 13 is held so that it can roll.

  The spherical roller 4 has a generatrix rolling surface that makes point contact with the spherical raceway 5 of the outer ring 2 on a plane including the central axis of the spherical roller 4.

  Each retainer 13 is disposed between an inner annular portion 14 located on the inner side in the axial direction, an outer annular portion 15 located on the outer side in the axial direction, and a facing portion between the inner annular portion 14 and the outer annular portion 15. And a plurality of column portions 16.

  Each cage 13 has a plurality of pockets formed by the inner annular portion 14, the outer annular portion 15 and the adjacent pillar portions 16 and 16. Each spherical pocket 4 is accommodated in each pocket.

  The inner annular portions 14 of the cages 13 are opposed to each other in the axial direction, and the outer surfaces in the axial direction are formed in parallel with the inner end surfaces in the axial direction of the spherical rollers 4. The axially inner end surface of the spherical roller 4 is guided by the axially outer surface of the inner annular portion 14.

  The outer annular portion 15 is formed such that the inner surface in the axial direction is parallel to the outer end surface in the axial direction of the spherical roller 4. The outer annular portion 15 extends radially inward with respect to the column portion 16. The inner peripheral portion of the outer annular portion 15 faces the collar 11 of the inner ring 3 in the radial direction.

  The inner peripheral portion of the outer annular portion 15 has a second seal mounting portion 17 formed at the outer end portion in the axial direction. The second seal mounting portion 17 is formed in a step shape that is recessed radially outward from the inner peripheral portion of the outer annular portion 15. The outer peripheral surface of the second seal mounting portion 17 is a cylindrical surface, and faces the second seal groove portion 12 of the inner ring 3 in the radial direction.

  The outer peripheral portion of the outer annular portion 15 has a tapered shape inclined inward in the radial direction toward the axially outer side, and the radially outer surface 15a is a conical surface.

  As shown in FIG. 2, the first seal 6 includes an annular cored bar 18 made of a metal plate and an elastic body 19 that is integrally fixed to the cored bar 18. The elastic body 19 is provided so as to cover the entire core metal 18 except for the inner surface of the intermediate portion in the radial direction of the core metal 18.

  In the first seal 6, a lip portion 20 is formed on the inner peripheral portion of the elastic body 19, and the outer peripheral portion of the elastic body 19 is press-fitted and fixed to the first seal mounting portions 8 on both axial sides of the outer ring 2. By this press-fitting and fixing, the first seal 6 is held by the first seal mounting portion 8, and the lip portion 20 is in sliding contact with the radially outer surface 15 a of the outer annular portion 15 of the cage 13.

  The first seal 6 held by the first seal mounting portion 8 is in a state of closing both axial sides between the outer ring 2 and the outer annular portion 15 of the cage 13.

  The second seal 7 includes an annular cored bar 21 made of a metal plate and an elastic body 22 that is integrally fixed to the cored bar 21. The cored bar 21 is formed by integrally forming a cylindrical portion 21a positioned on the radially outer side and a disk portion 21b extending radially inward from the cylindrical portion 21a.

  The elastic body 22 is provided so as to cover the outer surface of the intermediate portion in the radial direction of the disc portion 21b of the core metal 21 and the inner end portion in the radial direction of the disc portion 21b. The second seal 7 has a lip portion 23 formed on the inner peripheral portion of the elastic body 22.

  In the second seal 7, the cylindrical portion 21 a of the core metal 21 is press-fitted and fixed to the second seal mounting portion 17 at the inner peripheral portion of the outer annular portion 15 of each of the cages 13 and 13. By this press-fitting and fixing, the second seal 7 is held by the second seal mounting portion 17, and the lip portion 23 comes into sliding contact with the second seal groove portion 12 at the outer peripheral portion of the inner ring 3.

  The second seal 7 held by the second seal mounting portion 17 is in a state of closing both sides in the axial direction between the outer annular portion 15 of the cage 13 and the outer peripheral portion of the inner ring 3.

  The self-aligning roller bearing 1 according to the first embodiment is configured as described above. In this self-aligning roller bearing 1, each of the cages 13 is incorporated between the outer ring 2 and the inner ring 3 with the inner annular portions 14 facing each other. In the assembled state, the inner peripheral portion of the outer annular portion 15 is guided by the collars 11 of the inner ring 3.

  Further, the spherical roller bearing 1 is in a state where both sides in the axial direction between the outer ring 2 and the outer annular portion 15 of the cage 13 are closed by the first seal 6, and the cage 13 is sealed by the second seal 7. Both sides in the axial direction between the outer annular portion 15 and the outer peripheral portion of the inner ring 3 are closed.

  In the self-aligning roller bearing 1, for example, when the inner ring 3 rotates and the outer ring 2 is stationary, the double-row spherical roller 4 has a spherical raceway 5 of the outer ring 2 and a double-row raceway 10 of the inner ring 3, 10 and revolve in the direction of rotation of the inner ring 3. The revolution speed of the spherical roller 4 is smaller than the rotation speed of the inner ring 3.

  Retainers 13, 13 holding the revolving double-row spherical rollers 4, 4 rotate in the same direction as the inner ring 3 at a rotational speed smaller than the rotational speed of the inner ring 3.

  In the retainer 13, the lip portion 20 of the first seal 6 is in sliding contact with the radially outer surface 15 a of the outer annular portion 15. For this reason, compared with the case where a seal is hold | maintained between the inner peripheral part of an outer ring | wheel, and the outer peripheral part of an inner ring | wheel, the 1st seal | sticker 6 can suppress wear of the lip | rip part 20. FIG.

  Further, the inner ring 3 rotates relative to the cage 13 at a rotational speed difference between the rotational speed of the inner ring 3 and the rotational speed of the cage 13. Here, the second seal 7 is held by the second seal mounting portion 17 of the outer annular portion 15 of the cage 13, and the lip portion 23 is in sliding contact with the second seal groove portion 12 on the outer peripheral portion of the inner ring 3.

  For this reason, the second seal 7 is rotated by a rotational speed difference between the rotational speed of the inner ring and the rotational speed of the cage 13, and the lip portion 23 is in sliding contact with the second seal groove 12 on the outer peripheral portion of the inner ring 3. Become. Thereby, compared with the case where a seal is hold | maintained between the inner peripheral part of an outer ring | wheel, and the outer peripheral part of an inner ring | wheel, abrasion of the lip | rip part 23 of the 2nd seal 7 can be suppressed.

  Further, in the self-aligning roller bearing 1, the grease sealed in the bearing space may be blown to the inner peripheral portion of the outer ring 2 by centrifugal force as the inner ring 3 rotates.

  Here, the first seal 6 is held in a state where the outer peripheral portion made of the elastic body 19 is press-fitted into the first seal mounting portions 8 on both axial sides of the inner peripheral portion of the outer ring 2. Due to the outer peripheral portion of the first seal 6, leakage of grease that is blown to the inner peripheral portion of the outer ring 2 to the outside is prevented.

  Furthermore, the retainer 13 has a tapered shape in which the outer peripheral surface 15a of the outer annular portion 15 is inclined radially inward toward the axially outer side. As a result, when an angular misalignment occurs between the central axis of the outer ring 2 and the central axis of the inner ring 3, the sliding between the lip portion 20 of the first seal 6 and the outer peripheral portion of the outer annular portion 15 of the cage 13 occurs. Changes in contact pressure can be suppressed.

  As shown in FIG. 3, the retainer 13 has an outer peripheral surface 15 a having an outer peripheral surface 15 a having a radius of curvature centered on the center of the bearing and a radially arcuate cross section protruding outward in the radial direction. It may be.

  In this case, when angular misalignment occurs between the central axis of the outer ring 2 and the central axis of the inner ring 3, the sliding contact pressure between the lip portion of the first seal and the outer peripheral portion of the outer annular portion of the cage changes. do not do.

  Next, a self-aligning roller bearing according to a second embodiment of the present invention will be described with reference to FIG. In the self-aligning roller bearing 1 of this embodiment, a lip portion 23 made of an elastic body 22 is formed on the outer peripheral portion of the second seal 7, and the second seal 7 is located between the cage 13 and the outer peripheral portion of the inner ring 3. This is different from the first embodiment described above in that both sides in the axial direction are closed. In other configurations, the same configurations as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The outer peripheral portion of the inner ring 3 in this embodiment has a second seal mounting portion 24 formed at the axially outer end portion of the collar 11. The second seal mounting portion 24 is formed in a step shape that is recessed radially inward from the outer peripheral portion of the collar 11, and the inner peripheral surface thereof is a cylindrical surface.

  The outer annular portion 15 of each retainer 13, 13 has a second seal groove portion 25 formed at the axially outer end portion of the inner peripheral portion. The second seal groove portion 25 is formed in a step shape that is recessed radially outward from the inner peripheral portion of the outer annular portion 15, and the outer peripheral surface thereof is a cylindrical surface.

  In the second seal 7, the cylindrical portion 21a of the metal core 21 made of a metal plate is located on the radially inner side, and the elastic body 22 is located on the outer surface of the radially intermediate portion of the disk portion 21b and the radially outer side of the disk portion 21b. It is provided so as to cover the end. The second seal 7 has a lip 23 formed on the outer peripheral portion of the elastic body 22.

  In the second seal 7, the cylindrical portion 21 a of the core metal 21 is press-fitted and fixed to the second seal mounting portions 24 at the outer end portions on both axial sides of the collar 11 of the inner ring 3. By this press-fitting and fixing, the second seal 7 is held by the second seal mounting portion 24, and the inner peripheral portion of the second seal groove portion 25 in which the lip portion 23 is formed in the outer annular portion of each retainer 13, 13. It will be in the state which touches.

  The second seal 7 held by the second seal mounting portion 24 is in a state of closing both sides in the axial direction between the outer annular portion 15 of the cage 13 and the outer peripheral portion of the inner ring 3.

  In the self-aligning roller bearing 1 of the second embodiment, as described above, for example, when the inner ring 3 rotates and the outer ring 2 stops, the inner ring 3 rotates relative to the cage 13 with the rotational speed of the inner ring 3. And the rotation speed difference between the rotation speed of the cage 13 and relative rotation.

  Here, the second seal 7 is held by the second seal mounting portion 24 on the outer peripheral portion of the inner ring 3, and the lip portion 23 is in sliding contact with the second seal groove portion 25 of the outer annular portion 15 of the cage 13.

  For this reason, the second seal 7 is rotated by a rotational speed difference between the rotational speed of the inner ring 3 and the rotational speed of the cage 13, and the lip portion 23 is formed in the second seal groove 25 of the outer annular portion 15 of the cage 13. It will be in sliding contact.

  Thereby, compared with the case where a seal is hold | maintained between the inner peripheral part of an outer ring | wheel, and the outer peripheral part of an inner ring | wheel, abrasion of the lip | rip part 23 of the 2nd seal 7 can be suppressed.

DESCRIPTION OF SYMBOLS 1 Self-aligning roller bearing 2 Outer ring 3 Inner ring 4 Spherical roller 5 Spherical track 6 First seal 7 Second seal 8 First seal mounting part 9 Lubrication hole 10 Track 11 Collar 12, 25 Second seal groove 13 Cage 14 Inner ring Part 15 Outer annular part 15a Surface 16 Column part 17, 24 Second seal mounting part 18, 21 Core metal 19, 22 Elastic body 20, 23 Lip part 21a Cylindrical part 21b Disc part 30 Outer ring 31 Spherical track 32 Inner ring 33 Spherical path 34 spherical roller 35 cage retainer 36 annular part 40 seal 41 cored bar 42 elastic body 43 outer lip 44 inner lip 45 screw

Claims (5)

An outer ring (2) having a spherical track (5) on the inner periphery, an inner ring (3) having a double row track (10) on the outer periphery, a spherical track (5) of the outer ring (2), and the inner ring (3) A double row spherical roller (4) incorporated between each of the double row raceways (10), two cages (13) holding the spherical roller (4) for each row, and the outer ring An annular first seal (6) that closes both sides in the axial direction between the inner periphery of (2) and the cage (13), and the outer periphery of the cage (13) and the inner ring (3) An annular second seal (7) that closes both sides in the axial direction,
Each of the cages (13) has an inner annular portion (14) positioned on the inner side in the axial direction, an outer annular portion (15) positioned on the outer side in the axial direction, the inner annular portion (14), and the outer annular portion (15). And a plurality of pillars (16) arranged between
The first seal (6) is held at both axial ends of the inner peripheral portion of the outer ring (2), and slidably contacts the outer peripheral portion of the outer annular portion (15) of the retainer (13). )
The second seal (7) is held on one of the inner peripheral portion of the outer annular portion (15) of the retainer (13) or the axially opposite sides of the outer peripheral portion of the inner ring (3), and the retainer A self-aligning roller bearing having a lip portion (23) slidably in contact with the other of the inner circumferential portion of the outer annular portion (15) of (13) or the outer circumferential portion of the inner ring (3) in the axial direction. The outer ring portion of the inner ring (3) has collars (11) formed on both sides in the axial direction, and the outer annular portion (15) of the cage (13) is formed to extend radially inward, The inner peripheral part of the outer annular part (15) is in a state of facing the collar (11) in the radial direction,
A second seal mounting portion (17) for holding the second seal (7) is provided at the axially outer end of the inner peripheral portion of the outer annular portion (15) of each of the cages (13), The self-aligning roller bearing according to claim 1, further comprising a second seal groove portion (12) in which a lip portion (23) of the second seal (7) slides at an axially outer end portion of the collar (11). The outer ring portion of the inner ring (3) has collars (11) formed on both sides in the axial direction, and the outer annular portion (15) of the cage (13) is formed to extend radially inward, The inner peripheral part of the outer annular part (15) is in a state of facing the collar (11) in the radial direction,
A second seal groove portion (25) in which the lip portion (23) of the second seal (7) slides at the axially outer end portion of the inner peripheral portion of the outer annular portion (15) of each retainer (13). The self-aligning roller bearing according to claim 1, further comprising a second seal mounting portion (24) for holding the second seal (7) at an axially outer end portion of the collar (11).   The automatic adjustment according to any one of claims 1 to 3, wherein an outer peripheral portion of the outer annular portion (15) of the retainer (13) has a tapered shape inclined radially inward toward the outer side in the axial direction. Center roller bearing.   The outer annular portion (15) of the cage (13) has an outer peripheral portion having a radius of curvature centered on the center of the bearing, and has a circular arc shape protruding outward in the radial direction. Spherical roller bearings described in any of the above.

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