JP2015161405A - Roller bearing with seal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller bearing including a seal capable of measuring a bearing clearance when the bearing is fixed to various types of machinery and being used at a position requiring that the bearing can be moved in an axial direction or at a free side position.SOLUTION: An axial end surface 12d of an outer racing 12 is formed with a salient part 12p protruded at a seal holder 21. An outer circumferential part and an inner circumferential part of the seal holder 21 are formed with an outer circumferential protrusion 21h and an inner circumferential protrusion 21i protruded at the outer racing 12 in an axial direction. Under a state in which a seal 25 is arranged at the inner circumferential surface of the salient 12p of the outer racing 12, the seal holder 21 is inserted in an axial direction toward the outer racing 12 to cause the seal 25 to be fastened and fixed to the outer racing 12 by the inner circumferential protrusion 21i and the outer circumferential surface of the salient 12p of the outer racing 12 and the inner circumferential surface of the protrusion 21h at the outer circumferential side of the seal holder 21 are fitted and fixed.

Description

  The present invention relates to a rolling bearing with a sealing device.

  Machines such as conveyors used in mining equipment are used in harsh environments such as mountainous areas and desert areas. Therefore, it is desired that the bearings used in these machines be improved in durability and life by providing a sealing device (seal). As a conventional bearing provided with a seal member, there has been proposed a bearing capable of preventing water and foreign matters from both ends by fixing oil seals to seal cases at both ends of an outer ring (see, for example, Patent Document 1). ).

  Further, machines such as conveyors used in mining equipment are often used under heavy load and impact load conditions. Therefore, a self-aligning roller bearing having a large load capacity is used in such a machine. As a conventional self-aligning roller bearing provided with a seal, there has been proposed a bearing capable of preventing water and foreign matters from both ends by an oil seal mounted by fitting a cored bar to both ends of the outer ring. (For example, refer to Patent Document 2).

JP 2002-339997 A Japanese Utility Model Publication No. 4-29130

  By the way, in the bearing of the said patent document 1, since the seal case is not fixed to the outer ring | wheel in the axial direction, the bearing holding | suppressing is needed on the axial direction both sides of a bearing. For this reason, there was a problem that it was difficult to use at the free side position. In addition, since the bearing retainer is used, it is difficult to move the bearing in the axial direction. For example, it is difficult to use in a device in which the shaft expands and contracts due to thermal expansion, such as a conveyor or a vibrating screen used in mining equipment. There was a problem of being.

  In addition, when installing a bearing on a machine used in mining equipment, it is necessary to measure the bearing clearance by inserting a thickness gauge or the like into the gap between the outer ring raceway surfaces in order to check the mounting condition of the bearing. There is. Here, the bearing of Patent Document 2 has a problem that it is difficult to measure the bearing clearance because the oil seal needs to be provided to the customer after being attached to the bearing in advance.

  The present invention has been made in view of the above circumstances, and is capable of measuring the bearing clearance when the bearing is mounted on various machines and used at a position where the bearing needs to be movable in the axial direction or at a free side position. It is an object of the present invention to provide a rolling bearing with a sealing device that can be used.

The above object of the present invention can be achieved by the following constitution.
(1) an outer ring having a raceway surface on the inner peripheral surface;
An inner ring having a raceway surface on the outer peripheral surface;
A plurality of rollers provided in a freely rollable manner between the raceways of the outer ring and the inner ring;
A sealing device having a seal holder fixed to an axial end of the outer ring, and a seal attached to the seal holder;
A rolling bearing with a sealing device comprising:
On the axial end surface of the outer ring, a convex portion protruding toward the seal holder in the axial direction is formed,
On the outer circumferential side and inner circumferential side of the seal holder, an outer circumferential projection and an inner circumferential projection that protrude toward the outer ring in the axial direction are formed,
With the seal disposed on the inner peripheral surface of the convex portion of the outer ring, the seal is inserted into the outer ring in the axial direction and fitted, so that the seal protrudes toward the inner peripheral side of the seal holder. A rolling bearing with a sealing device, which is fixed to the outer ring by a portion, and an outer peripheral surface of a convex portion of the outer ring and an inner peripheral surface of an outer peripheral side protrusion of the seal holder are fitted and fixed.
(2) The rolling bearing with a sealing device according to (1), wherein the seal is mounted by being fitted and fixed to an inner peripheral surface of the seal holder.
(3) an outer ring having a raceway surface on the inner peripheral surface;
An inner ring having a raceway surface on the outer peripheral surface;
A plurality of rollers provided in a freely rollable manner between the raceways of the outer ring and the inner ring;
A sealing device having a seal holder fixed to an axial end of the inner ring, and a seal attached to the seal holder;
A rolling bearing with a sealing device comprising:
On the axial end surface of the inner ring, a convex portion protruding toward the seal holder in the axial direction is formed,
On the outer circumferential side and inner circumferential side of the seal holder, an outer circumferential projection and an inner circumferential projection that protrude toward the inner ring in the axial direction are formed,
With the seal disposed on the outer peripheral surface of the convex portion of the inner ring, the seal holder is inserted in the axial direction toward the inner ring and fitted, whereby the seal is formed by the outer peripheral side protrusion of the seal holder. A rolling bearing with a sealing device, which is fixed to the inner ring, and an inner peripheral surface of a convex portion of the inner ring and an outer peripheral surface of an inner peripheral side protrusion of the seal holder are fitted and fixed.
(4) The rolling bearing with a sealing device according to (3), wherein the seal is mounted by being fitted and fixed to an outer peripheral surface of the seal holder.
(5) The rolling bearing is a self-aligning rolling bearing,
The raceway surface of the outer ring is provided as a spherical concave surface having a single center on the inner peripheral surface of the outer ring,
The inner ring raceway surface is provided in two rows on the outer circumferential surface of the inner ring so as to face the outer ring raceway surface,
The plurality of rollers are spherical rollers provided in two rows so as to be able to roll between the raceway surfaces of the inner ring and the outer ring, according to any one of (1) to (4). Rolling bearing with sealing device.

According to the rolling bearing with a sealing device of the present invention, since the seal can be easily and firmly fixed by the seal holder, the bearing and the sealing device can be separated and delivered to the customer. This makes it possible to fix the sealing device after measuring the bearing clearance when mounting the bearing on various machines.
Further, since the sealing device is firmly fixed, it becomes possible to use the bearing at a position where it is necessary to be able to move in the axial direction or a free side position, and a structure that restricts the axial movement of the sealing device, for example, A structure that restricts the axial movement of the sealing device 20 by extending the housing radially inward becomes unnecessary.

It is sectional drawing of the self-aligning roller bearing with a sealing device which concerns on 1st Embodiment of this invention. It is principal part sectional drawing of the self-aligning roller bearing with a sealing device. It is sectional drawing of the self-aligning roller bearing with a sealing device which concerns on 2nd Embodiment of this invention. It is sectional drawing of the self-aligning roller bearing with a sealing device which concerns on 3rd Embodiment of this invention.

  Hereinafter, a rolling bearing with a sealing device according to each embodiment of the present invention will be described with reference to FIGS.

(First embodiment)
Hereinafter, a rolling bearing with a sealing device according to a first embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the self-aligning roller bearing 1 according to the first embodiment has dimensions of an outer diameter of 540 mm, an inner diameter of 320 mm, and a width of 176 m, for example, and between the inner ring 11 and the outer ring 12, A plurality of spherical rollers 13, 13 are arranged in two rows. The spherical rollers 13 in each row are held at a constant circumferential interval by a cage 16. The cage 16 is made of metal and is used for outer ring guidance.

  Two rows of raceway surfaces 11 b and 11 b are formed on the outer peripheral surface 11 c of the inner ring 11. The inner peripheral surface 11f of the inner ring 11 is formed in a tapered shape.

  The outer ring 12 has a raceway surface 12a which is a spherical concave surface on the inner peripheral surface 12c, and the center of curvature of the raceway surface 12a coincides with the center of the self-aligning roller bearing 1, and Alignment is ensured.

  The spherical rollers 13 arranged in each row have a barrel-shaped rolling surface 13 a and roll between the raceway surface 11 b of the inner ring 11 and the raceway surface 12 a of the outer ring 12.

  The sealing device 20 includes an annular seal holder 21 fixed to the axial end surface 12 d (axial end) of the outer ring 12 and a seal 26 attached to the seal holder 21. The seal 26 is configured to cover a core bar composed of a first core bar 25 and a second core bar 29. The first metal core 25 has a substantially cylindrical shape extending to the inner peripheral side, and is axially inner than the first metal core 25 swaged and fixed to the outer ring 12 and the radially inner end of the first metal core 25. The second cored bar 29 is arranged and extends inward in the radial direction.

  The seal 26 is formed of an elastic body such as rubber, and the first extending portion 22 having a substantially linear cross section fixed to the outer surface in the axial direction of the first metal core 25 and the outer side in the axial direction of the second metal core 29. The second extending portion 23 having a substantially linear cross section fixed to the side surface, the first extending portion 22 and the second extending portion 23 are continuous with each other, and the radially inner end portion of the first cored bar 25 and the second extending portion 23. And a connecting portion 24 for connecting a radially outer end portion of the cored bar 29. Here, since the radially inner end of the first cored bar 25 is positioned more radially outward than the radially outer end of the second cored bar 29, the connecting portion 24 of the seal 26 is axially inner. It is set as the cross-sectional substantially linear shape which inclines in radial direction as it goes to.

  The seal 26 has a lip portion 28 that is connected to the radially inner end portion of the second extending portion 23 and is fixed to the radially inner end portion of the second core metal 29 in the axial direction. The radially inner end of the lip portion 28 is in sliding contact with the outer peripheral surface 11 c of the inner ring 11 to seal between the outer ring 12 and the inner ring 11. Since it is necessary to make the lip portion 28 slidably contact the outer peripheral surface 11 c of the inner ring 11, a tightening spring 27 is attached to the outer peripheral surface of the lip portion 28, and the lip portion is applied by the elastic force of the tightening spring 27. 28 is urged toward the outer peripheral surface 11 c of the inner ring 11. The lip portion 28 is in sliding contact with the outer peripheral surface 11c of the inner ring 11, so that the bearing space is sealed, so that liquid and foreign matter can be prevented from entering from the outside, and the lubricant enclosed in the bearing space can be prevented from flowing out. Can do.

  Here, referring also to FIG. 2, the axial end surface 12d of the outer ring 12 is formed with a convex portion 12p protruding in the axial direction toward the seal holder 21 (axially outer side), and on the inner peripheral surface of the convex portion 12p. Is provided with a semicircular seal groove 12q that is smoothly connected to the axial end face 12d.

  In addition, an outer peripheral side protrusion 21h and an inner peripheral protrusion 21i that protrude toward the outer ring 12 (in the axial direction) in the axial direction are formed at the outer peripheral end and the inner peripheral end of the seal holder 21. The inner peripheral surface of the outer peripheral protrusion 21 h is fitted with the outer peripheral surface of the convex portion 12 p of the outer ring 12. The inner peripheral surface 21j of the inner peripheral projection 21i is an inclined surface that is inclined inward in the axial direction toward the outer peripheral side, and a straight portion 25b of the first core metal 25 described later is formed by the tip 21k. It is possible to crimp the outer ring 12.

  The first cored bar 25 fixed to the seal groove 12q is in contact with the base portion 25a having a semicircular cross section corresponding to the seal groove 12q and the axial end surface 12d of the outer ring 12 extending from the base portion 25a to the inner peripheral side. The linear portion 25b has an inclined portion 25c that is inclined outward in the axial direction as extending from the linear portion 25b toward the inner peripheral side, and is opposed to the inner peripheral surface 21j of the inner peripheral side protruding portion 21i through a gap.

  Then, the seal holder 21 and the seal 26 are fixed to the outer ring 12 in a state where the first metal core 25 is disposed in the seal groove 12q of the convex portion 12p of the outer ring 12, and the seal holder 21 is axially directed toward the outer ring 12. This is done by inserting. As a result, the straight portion 25 b of the first metal core 25 is crimped to the axial end surface 12 d of the outer ring 12 by the tip 21 k of the inner peripheral projection 21 i of the seal holder 21, and the seal 26 is fixed to the outer ring 12. At the same time, the inner peripheral surface of the outer peripheral projection 21h of the seal holder 21 is fitted and fixed to the outer peripheral surface of the convex portion 12p of the outer ring 12, and the seal holder 21 (sealing device 20) and the outer ring 12 are firmly fixed to each other. . Thus, in this embodiment, the seal holder 21 also has a function as a caulking jig for the seal 26. At this time, the seal holder 21 does not extend outward from the outer peripheral surface 12 e of the outer ring 12 and does not extend outward in the axial direction from the axial end surface of the inner ring 11. An increase in the radial dimension and the axial dimension is suppressed.

  With this configuration, the seal holder 21 and the seal 26 are firmly fixed to the outer ring 12 and, consequently, the self-aligning roller bearing 1, so that it is not necessary to use a bearing retainer. As a result, the structure can be simplified and can be used while maintaining the sealing performance of the self-aligning roller bearing 1 even at a position where the apparatus is free or where the bearing needs to be movable in the axial direction. It becomes. That is, a structure for restricting the axial movement of the sealing device 20, for example, a structure for restricting the axial movement of the sealing device 20 by extending the housing radially inward becomes unnecessary.

  Further, as described above, the inner peripheral surface 11f of the inner ring 11 is formed in a taper shape. However, if the amount of axial bearing pressing is large, the inner ring 11 expands, resulting in a decrease in bearing clearance. However, according to the self-aligning self-aligning roller bearing 1 of the present embodiment, the seal 26 can be easily and firmly fixed by the seal holder 21, so the bearing body and the sealing device 20 are separated from each other to the customer. Can deliver. Therefore, it is possible to measure the bearing clearance for the purpose of confirming the mounting state of the bearing before mounting on various machines. Then, by pressing the bearing in the axial direction so that the measured value of the bearing clearance becomes an appropriate value, it is possible to perform appropriate installation and improve maintainability.

  Further, since the position of the seal 26 is fixed by fixing the seal holder 21, the sealing performance can be further improved.

  In addition, at least one surface layer of the inner ring 11, the outer ring 12, and the spherical roller 13 is preferably formed of a carburized or carbonitrided material having a retained austenite amount (γR vol%) of 20 to 45 vol%. . Alternatively, at least one surface layer of the inner ring 11, the outer ring 12, and the spherical roller 13 has a retained austenite amount (γR vol%) of 20 to 45 vol%, C; 0.1 to 1.2 wt%, Cr; 1 The surface hardness (Hv) of the surface layer that is carburized or carbonitrided with Mo of 2.0 wt% or less and 1/3 or more of the Cr content. It is preferably formed from an alloy steel in a range of −4.7 × (γR vol%) + 920 ≦ Hv ≦ −4.7 × (γR vol%) + 1020 with respect to the amount of retained austenite. Alternatively, at least one surface layer of the inner ring 11, the outer ring 12, and the spherical roller 13 has a retained austenite amount (γR vol%) of 20 to 45 vol%, C; 0.1 to 1.2 wt%, Cr; 1 The surface hardness (Hv) of the surface layer that is carburized or carbonitrided with Mo of 2.0 wt% or less and 1/3 or more of the Cr content. It is preferably formed from an alloy steel in a range of −4.7 × (γR vol%) + 920 ≦ Hv ≦ −4.7 × (γR vol%) + 1020 with respect to the amount of retained austenite. By forming the surface layer of at least one of the inner ring 11, the outer ring 12 and the spherical roller 13 with these materials, the durability of the self-aligning roller bearing 1 can be further improved and the life can be extended. Although these materials are desirably used for any of the surface layers of the inner ring 11, the outer ring 12, and the spherical roller 13, it is possible to obtain a sufficient effect even when used only in a portion that is easily damaged. For example, when the self-aligning roller bearing 1 is rotating the outer ring, these materials may be used only for the surface layer of the inner ring 11.

  In the present embodiment, the inner peripheral surface of the outer peripheral projection 21h of the seal holder 21 is directly fitted to the outer peripheral surface of the convex portion 12p of the outer ring 12, but a rubber ring-shaped member is interposed therebetween. It is good also as a structure to arrange.

(Second Embodiment)
Hereinafter, a rolling bearing with a sealing device according to a second embodiment of the present invention will be described with reference to FIG. Parts having the same configuration as in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 3, the self-aligning roller bearing 1 according to the second embodiment further includes an O-ring 30 between the axial end surface 12 d of the outer ring 12 and the seal holder 21. The O-ring 30 is disposed on the outer peripheral side of the convex portion 12p of the outer ring 12. By arranging the O-ring 30 in this way, the sealing performance can be further improved, and liquid and foreign matter can be prevented from entering the bearing from the outer peripheral side of the outer ring 12 of the self-aligning roller bearing 1. If necessary, an O-ring groove (not shown) for fixing the O-ring 30 may be provided on the axial end surface 12d of the outer ring 12 or the end surface of the seal holder 21 facing the outer ring 12.

(Third embodiment)
Hereinafter, a rolling bearing with a sealing device according to a third embodiment of the present invention will be described with reference to FIG. Parts having the same configuration as in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 4, in this embodiment, unlike the above-described embodiment, the seal groove 12 q (see FIG. 2) is not formed on the inner peripheral surface of the convex portion 12 p of the outer ring 12. Moreover, the 1st metal core 25 does not have the base 25a (refer FIG. 2) of cross-sectional semicircle shape. On the other hand, a first cored bar 25 and a seal 26 are fitted and fixed to the inner peripheral surface of the seal holder 21 (inner peripheral side protruding portion 21i). Therefore, since the seal 26 (first core metal 25) is attached to the seal holder 21 so as to be integrated, it is possible to improve the handleability.

  Then, the seal holder 21 and the seal 26 are fixed to the outer ring 12 by attaching the seal 26 (first core metal 25) to the seal holder 21 in advance and then inserting the seal holder 21 toward the outer ring 12. Is called. As a result, the first cored bar 25 is disposed on the inner peripheral surface of the convex part 12p of the outer ring 12, and the straight part 25b of the first cored bar 25 is further formed by the tip 21k of the inner peripheral side protruding part 21i of the seal holder 21. Is fitted to the axial end surface 12 d of the outer ring 12, and the seal 26 is fixed to the outer ring 12. At the same time, the inner peripheral surface of the outer peripheral projection 21h of the seal holder 21 is fitted and fixed to the outer peripheral surface of the convex portion 12p of the outer ring 12, and the seal holder 21 (sealing device 20) and the outer ring 12 are firmly fixed to each other. .

  Therefore, according to the present embodiment, the handleability of the seal 21 and the seal 26 (first core metal 25) can be improved, and the same effects as those of the first embodiment can be achieved.

  In the present embodiment as well, an O-ring may be provided on the axial end surface 12d of the outer ring 12 or the end surface of the seal holder 21 facing the outer ring 12 in order to improve the sealing performance as in the second embodiment. Absent.

  In the first to third embodiments described above, if the tension force of the seal 26 is too low, the followability of the shaft may be deteriorated. Further, the seal 26 cannot withstand the pressure of the lubricant in the bearing space, and there is a possibility that the sealing performance cannot be secured. On the other hand, if the tension of the seal 26 is too high, wear tends to occur between the lip portion 28 and the outer peripheral surface 11 c of the inner ring 11. For this reason, the tension force of the seal 26 is preferably 10 to 100N, and more preferably 30 to 80N.

  In addition, this invention is not limited to embodiment mentioned above, A change, improvement, etc. are possible suitably.

  For example, in the above-described embodiment, the seal holder 21 is fixed to the axial end of the outer ring 12, but may be fixed to the axial end of the inner ring 11 (not shown). In this case, the sealing device 20 is in an inverted state on the inner peripheral side and the outer peripheral side, and the lip 28 of the seal 26 comes into sliding contact with the inner peripheral surface 12 c of the outer ring 12. Further, a convex portion that protrudes toward the seal holder 21 in the axial direction is formed on the axial end surface of the inner ring 11, and the outer peripheral side end and the inner peripheral side end of the seal holder 21 have an inner ring side ( An outer peripheral protrusion and an inner peripheral protrusion that protrude inward in the axial direction are formed. Then, with the seal 26 disposed on the outer peripheral surface of the convex portion of the inner ring 11, the seal holder 21 is inserted in the axial direction toward the inner ring 11, so that the seal 11 is inserted into the inner ring 11 by the outer peripheral side protrusion of the seal holder 21. And the inner peripheral surface of the convex portion of the inner ring 11 and the outer peripheral surface of the inner peripheral side protrusion of the seal holder 21 are fitted and fixed. Even with such a configuration, it is possible to obtain the same effects as those of the above-described embodiment.

  Even in this case, similarly to the third embodiment, the seal 26 and the first metal core 25 are configured to be mounted in advance by being fitted and fixed to the outer peripheral surface of the seal holder 21, and are easy to handle. It may be possible to improve.

  In the above-described embodiment, the inner peripheral surface 11f of the inner ring 11 is formed in a tapered shape, but the inner peripheral surface 11f may be formed in a cylindrical shape.

  Further, the sealing device in the embodiment described above can be attached to both ends of a bearing other than the self-aligning roller bearing, for example, a cylindrical roller bearing, a tapered roller bearing, or a combination bearing in which two or more of the above-described bearings are combined. Are also within the scope of the present invention. Moreover, the rolling bearing with a sealing device according to the present invention can be used not only on the free side of industrial machines, for example, mining equipment machines, but also on the fixed side.

DESCRIPTION OF SYMBOLS 1 Spherical roller bearing 11 Inner ring 11b Inner ring raceway surface 11c Inner ring outer peripheral surface 11f Inner ring inner peripheral surface 12 Outer ring 12a Outer ring raceway surface 12c Outer ring inner peripheral surface 12d Outer ring axial end surface 12e Outer ring outer peripheral surface 12p Protruding part 12q Seal groove 13 Spherical roller 13a Rolling surface 16 Cage 16a Annulus 16b Column 20 Sealing device 21h Outer peripheral projection 21i Inner peripheral projection 21j Inner peripheral surface 21k Tip 22 First extension 23 Second extension 24 Connection 25 First cored bar 25a Base 25b Straight line 25c Inclined part 26 Seal 27 Clamping spring 28 Lip part 29 Second cored bar

Claims (5)

An outer ring having a raceway surface on the inner peripheral surface;
An inner ring having a raceway surface on the outer peripheral surface;
A plurality of rollers provided in a freely rollable manner between the raceways of the outer ring and the inner ring;
A sealing device having a seal holder fixed to an axial end of the outer ring, and a seal attached to the seal holder;
A rolling bearing with a sealing device comprising:
On the axial end surface of the outer ring, a convex portion protruding toward the seal holder in the axial direction is formed,
On the outer circumferential side and inner circumferential side of the seal holder, an outer circumferential projection and an inner circumferential projection that protrude toward the outer ring in the axial direction are formed,
With the seal disposed on the inner peripheral surface of the convex portion of the outer ring, the seal is inserted into the outer ring in the axial direction and fitted, so that the seal protrudes toward the inner peripheral side of the seal holder. A rolling bearing with a sealing device, which is fixed to the outer ring by a portion, and an outer peripheral surface of a convex portion of the outer ring and an inner peripheral surface of an outer peripheral side protrusion of the seal holder are fitted and fixed. The rolling bearing with a sealing device according to claim 1, wherein the seal is mounted by being fitted and fixed to an inner peripheral surface of the seal holder. An outer ring having a raceway surface on the inner peripheral surface;
An inner ring having a raceway surface on the outer peripheral surface;
A plurality of rollers provided in a freely rollable manner between the raceways of the outer ring and the inner ring;
A sealing device having a seal holder fixed to an axial end of the inner ring, and a seal attached to the seal holder;
A rolling bearing with a sealing device comprising:
On the axial end surface of the inner ring, a convex portion protruding toward the seal holder in the axial direction is formed,
On the outer circumferential side and inner circumferential side of the seal holder, an outer circumferential projection and an inner circumferential projection that protrude toward the inner ring in the axial direction are formed,
With the seal disposed on the outer peripheral surface of the convex portion of the inner ring, the seal holder is inserted in the axial direction toward the inner ring and fitted, whereby the seal is formed by the outer peripheral side protrusion of the seal holder. A rolling bearing with a sealing device, which is fixed to the inner ring, and an inner peripheral surface of a convex portion of the inner ring and an outer peripheral surface of an inner peripheral side protrusion of the seal holder are fitted and fixed. The rolling bearing with a sealing device according to claim 3, wherein the seal is mounted by being fitted and fixed to an outer peripheral surface of the seal holder. The rolling bearing is a self-aligning rolling bearing;
The raceway surface of the outer ring is provided as a spherical concave surface having a single center on the inner peripheral surface of the outer ring,
The inner ring raceway surface is provided in two rows on the outer circumferential surface of the inner ring so as to face the outer ring raceway surface,
5. The sealing device according to claim 1, wherein the plurality of rollers are spherical rollers provided in two rows so as to be able to roll between the raceway surfaces of the inner ring and the outer ring. Rolling bearing with.

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