WO2024018524A1

WO2024018524A1 - Roller bearing

Info

Publication number: WO2024018524A1
Application number: PCT/JP2022/028051
Authority: WO
Inventors: 昭人鳥居
Original assignee: 株式会社ジェイテクト
Priority date: 2022-07-19
Filing date: 2022-07-19
Publication date: 2024-01-25

Abstract

A roller bearing 1 according to the present disclosure is equipped with an inner ring 2, an outer ring 3, a plurality of rollers 4, and a resin cage 6 which holds the plurality of rollers 4 so as to be separated from one another by an interval in the circumferential direction. The cage 6 has a pair of ring-shaped bodies 10 and a plurality of columns 12 which connect the pair of ring-shaped bodies 10. Each of the plurality of columns 12 has a column main body 14 and a hook part 16, which is provided to the column main body 14 and prevents the rollers 4 inside a pocket 7 from falling out in the radial direction. The column main body 14 has a pair of projecting parts 20 which extend from the pair of ring-shaped bodies 10 in the axial direction, and a connecting column 22 which connects the pair of projecting parts 20. The connecting column 22 has an outside surface 24 which is oriented toward the outside 6a in the radial direction. The position of the outside surface 24 in the radial direction is farther toward the inside 6b in the radial direction relative to the positions in the radial direction of a pair of radial-direction surfaces 20a of the pair of projecting parts 20. The hook parts 16 are provided so as to project toward the outside 6a in the radial direction from the outside surface 24.

Description

roller bearing

The present invention relates to roller bearings.

A roller bearing includes an inner ring, an outer ring, a plurality of rollers, and an annular retainer that holds the plurality of rollers. The holder includes a pair of annular bodies and a plurality of columns connecting the pair of annular bodies. A pocket for holding the roller is located between the pair of annular portions and the pair of circumferentially adjacent columns.
Regarding such a cage, as shown in FIG. 6, claw portions 104 may be provided on the pillars 106a of the cage 106. The claw portion 104 prevents the roller 102 inside the pocket 100 from slipping out from the pocket 100.

The roller bearing includes an inner ring assembly and an outer ring. The inner ring assembly is, for example, a combination of an inner ring, rollers, and a cage. This bearing is then completed through a process of assembling the inner ring assembly and the outer ring.
The above-mentioned inner ring assembly is obtained by arranging the cage 106 on the outer peripheral side of the inner ring 108 and then arranging the rollers 102 in the pockets 100 of the cage 106.
Claws 104 retain rollers 102 on the inner ring assembly. The claw portion 104 prevents the roller 102 from slipping out from inside the pocket 100.

The retainer 106 is made of resin. The claw portion 104 is elastically deformable.
When the rollers 102 are inserted into the pockets 100 of the retainer 106 arranged on the outer circumferential side of the inner ring 108, the rollers 102 elastically deform the claws 104, the distance between the claws 104 expands, and the rollers 102 move into the pockets 100. Go inside.

JP 2016-35269 Publication

As the resin used for the cage, PPS (Polyphenylene sulfide) is sometimes used in consideration of rigidity and the like.
PPS has high rigidity. When PPS is applied to a cage, there are the following concerns.
The first concern is that when the rollers 102 elastically deform the claw portion 104, whitening, cracking, chipping, etc. may occur at the base end of the claw portion 104.
The second concern is that the claw portions 104 may be forcibly removed from the mold for forming the retainer 106, and whitening, cracking, chipping, etc. may occur at the proximal end portions of the claw portions 104.
Therefore, it is necessary to suppress the amount of elastic deformation of the claw portion 104.

If the length of the claw portions 104 in the radial direction is increased, the distance between the claw portions 104 can be expanded without significantly elastically deforming the claw portions 104. That is, by increasing the length of the claws 104 in the radial direction, the spacing between the claws 104 can be maintained at the same distance as before, and the strain caused by elastic deformation of the claws 104 can be reduced. However, the claw portion 104 may protrude radially outward and come into contact with the outer ring.

An embodiment according to the present disclosure is a roller bearing. This roller bearing includes an inner ring, an outer ring, a plurality of rollers interposed between the inner ring and the outer ring, and a resin retainer that holds the plurality of rollers at intervals along the circumferential direction. Equipped with. The retainer includes a pair of annular bodies and a plurality of columns connecting the pair of annular bodies. A space surrounded by a pair of adjacent pillars among the plurality of pillars and the pair of annular bodies constitutes a pocket that holds the roller. Each of the plurality of columns includes a column main body, and a claw portion provided on the column body to prevent the roller in the pocket from slipping out in the radial direction. The pillar main body has a pair of protrusions extending in the axial direction from the pair of annular bodies, and a connecting column that connects the pair of protrusions. The connecting column has a first surface facing toward a first radial side, which is either a radially outer side or a radially inner side of the retainer. The radial position of the first surface is greater than the radial position of the pair of radial surfaces facing toward the radial first side in the pair of protrusions, and the radial position is closer to the radial direction opposite to the radial first side. It is closer to the 2nd side. The claw portion is provided so as to protrude from the first surface toward the first radial side.

According to the present disclosure, it is possible to suppress the amount of elastic deformation of the claw portion when the claw portion is elastically deformed while suppressing the protrusion of the claw portion in the radial direction.

FIG. 1 is a sectional view of a roller bearing according to an embodiment. FIG. 2 is a perspective view of the cage. FIG. 3 is a partially enlarged view of the cage. FIG. 4 is a cross-sectional view of the claw portion when the roller bearing is cut along a plane perpendicular to the central axis. FIG. 5 is a sectional view of a roller bearing according to another embodiment. FIG. 6 is a cross-sectional view of a conventional roller bearing.

First, the contents of the embodiment will be listed and explained.
[Overview of embodiment]
(1) An embodiment according to the present disclosure is a roller bearing. This roller bearing includes an inner ring, an outer ring, a plurality of rollers interposed between the inner ring and the outer ring, and a resin retainer that holds the plurality of rollers at intervals along the circumferential direction. Equipped with. The retainer includes a pair of annular bodies and a plurality of columns connecting the pair of annular bodies. A space surrounded by a pair of adjacent pillars among the plurality of pillars and the pair of annular bodies constitutes a pocket that holds the roller. Each of the plurality of columns includes a column main body, and a claw portion provided on the column body to prevent the roller in the pocket from slipping out in the radial direction. The pillar main body has a pair of protrusions extending in the axial direction from the pair of annular bodies, and a connecting column that connects the pair of protrusions. The connecting column has a first surface facing toward a first radial side, which is either a radially outer side or a radially inner side of the retainer. The radial position of the first surface is greater than the radial position of the pair of radial surfaces facing toward the radial first side in the pair of protrusions, and the radial position is closer to the radial direction opposite to the radial first side. It is closer to the 2nd side. The claw portion is provided so as to protrude from the first surface toward the first radial side.

According to the above configuration, the radial position of the first surface is closer to the second radial side than the radial position of the pair of radial surfaces of the pair of protrusions, and the claw portion is radially away from the first surface. Since the roller bearing of the embodiment according to the present disclosure is provided so as to protrude toward the first side in the radial direction, the pawl portion can be prevented from protruding largely from the radial surface toward the first radial side, and the pawl portion A larger radial length of the portion can be ensured.
As a result, the roller bearing of the embodiment according to the present disclosure can suppress the protrusion of the claw portion in the radial direction and reduce the strain caused by the elastic deformation of the claw portion when the claw portion is elastically deformed.

(2) In the roller bearing, if each of the pair of protrusions has a tip surface that connects the radial surface and the first surface, there is a gap between the axial side surface of the pawl and the tip surface. It is preferable that a predetermined interval be provided between the two.
In this case, the roller bearing according to the embodiment of the present disclosure can reduce strain caused by elastic deformation in the claw portion over the entire region from the base end to the tip end.

(3) In the roller bearing, the radial position of the first surface is preferably closer to the second radial side than the radial position of the central axis of the plurality of rollers.
In this case, in the roller bearing of the embodiment according to the present disclosure, since the radial position of the first surface is closer to the second radial side, the protrusion of the pawl portion in the radial direction is suppressed, and the pawl portion is A larger radial length can be ensured.

(4) In the roller bearing, the radial position of the first surface is closer to the second radial side than the radial position of the pair of annular surfaces facing toward the second radial side of the pair of annular bodies. There may be.
In this case as well, in the roller bearing of the embodiment according to the present disclosure, the radial position of the first surface is closer to the second radial side, so that while the protrusion of the pawl portion in the radial direction is suppressed, the pawl portion A larger radial length can be ensured.

(5) In the roller bearing, the connecting column has a second surface facing the second radial side, and the radial position of the second surface is on the second radial side of the pair of annular bodies. The radial position of the pair of annular surfaces may be closer to the second radial side than the radial position of the pair of annular surfaces facing.
In this case, the roller bearing of the embodiment according to the present disclosure can ensure the appropriate radial thickness of the connecting column while ensuring the radial length of the claw portion.

[Details of embodiment]
Hereinafter, preferred embodiments will be described with reference to the drawings.
[About the first embodiment]
FIG. 1 is a sectional view of a roller bearing according to a first embodiment.
In FIG. 1, a roller bearing 1 can be used as a bearing that supports rotating shafts of various devices.
The roller bearing 1 includes an inner ring 2, an outer ring 3, a plurality of rollers 4, and a cage 6. In addition, in FIG. 1, the roller 4 is shown by a two-dot chain line.
The inner ring 2 and the outer ring 3 are annular members made of, for example, alloy steel for machine structures, bearing steel, or the like.
On the outer peripheral side of the inner ring 2, a raceway 2a and a pair of ribs 2b are provided. The pair of flanges 2b are provided at both ends of the inner ring 2 in the outer circumferential direction in the axial direction. A track 2a is provided between the pair of ribs 2b.
A raceway 3a is provided on the inner peripheral side of the outer ring 3. The track 2a and the track 3a are tracks on which the rollers 4 roll.

The plurality of rollers 4 are, for example, cylindrical members made of bearing steel or the like. The plurality of rollers 4 are rotatably interposed between the track 2a and the track 3a.
The cage 6 holds the plurality of rollers 4 at regular intervals in the circumferential direction.
The retainer 6 has a plurality of pockets 7 that accommodate and hold the plurality of rollers 4. The plurality of pockets 7 are provided at equal intervals in the circumferential direction.

FIG. 2 is a perspective view of the retainer 6. The cage 6 is made of PPS, for example, and is obtained by injection molding.
The retainer 6 has a pair of annular bodies 10 and a plurality of columns 12. A plurality of pillars 12 connect a pair of annular bodies 10 to each other.
The plurality of pillars 12 are connected to the pair of side surfaces 10a of the pair of annular bodies 10, and are provided at equal intervals along the circumferential direction of the retainer 6. The plurality of pillars 12 extend along the axial direction.
A space surrounded by a pair of adjacent pillars 12 among the plurality of pillars 12 and a pair of annular bodies 10 constitutes the pocket 7.

Note that the circumferential direction of the cage 6 is a direction along a circle centered on the central axis C of the cage 6 (a pair of annular bodies 10). The axial direction of the cage 6 is parallel to the central axis C. Further, the radial direction of the cage 6 is a direction perpendicular to the central axis C. Further, the radially outer side 6a of the cage 6 is the side facing the outer circumference of the cage 6 in the radial direction, as shown in FIG. Further, the radially inner side 6b of the cage 6 is a side facing toward the inner circumference of the cage 6 in the radial direction.

FIG. 3 is a partially enlarged view of the retainer 6, showing the columns 12.
As shown in FIG. 3, each of the plurality of columns 12 has a column main body 14 and a pair of claw parts 16.
The column main body 14 has a pair of protrusions 20 and a connecting column 22.
The pair of protrusions 20 extend inward in the axial direction from the side surfaces 10a of the pair of annular bodies 10.
The protrusion 20 has a first radial surface 20a, a second radial surface 20d, a pair of circumferential side surfaces 20b, and a tip surface 21a. The first radial surface 20a is a surface facing radially outward 6a. The first radial surface 20a is a cylindrical surface centered on the central axis C of the cage. The second radial surface 20d is a surface facing radially inward 6b. The second radial surface 20d is a cylindrical surface centered on the central axis C of the cage. The pair of circumferential side surfaces 20b are planes parallel to the plane containing the central axis C, respectively. The tip surface 21a is a plane perpendicular to the central axis C of the cage.
The side surface 10a of the annular body 10 is a plane perpendicular to the central axis C of the cage.

The connecting column 22 connects the pair of protrusions 20 to each other. Both ends of the connecting column 22 are connected to a pair of tip portions 21 of a pair of protrusions 20 .
The connecting column 22 has an outer surface 24 (first surface) facing toward the radially outer side 6a (radially first side), and an inner surface 26 (second surface) facing toward the radially inner side 6b (radially second side). , and a circumferential side surface 22b. The outer surface 24 (first surface) mainly includes a cylindrical surface centered on the central axis C of the cage. The inner surface 26 (second surface) is a cylindrical surface centered on the central axis C of the cage. The circumferential side surface 22b is a plane parallel to the plane containing the central axis C. The outer surface 24 and the inner surface 26 may be planes perpendicular to the radial direction and parallel to the axial direction at their respective circumferential centers.
Here, both end portions 22a of the connecting column 22 are connected to radially inner end portions of the pair of tip portions 21. The distal end surface 21 a is located on the radially outer side of the connecting column 22 in the distal end portion 21 .
The pair of tip surfaces 21a connect the first radial surfaces 20a of the pair of protrusions 20 and the outer surface 24. The radial position of the outer surface 24 is closer to the radial inner side 6b than the radial position of the pair of first radial surfaces 20a.
The pair of first radial surfaces 20a and the pair of annular outer peripheral surfaces 10b of the pair of annular bodies 10 are flush with each other. The pair of annular outer circumferential surfaces 10b are surfaces facing radially outward 6a of the pair of annular bodies 10. The pair of annular outer circumferential surfaces 10b are cylindrical surfaces centered on the central axis C of the cage.
Therefore, the radial position of the outer surface 24 is closer to the radial inner side 6b than the radial position of the pair of annular outer peripheral surfaces 10b.

The outer surface 24 has an outer surface portion 24a and a pair of concave curved surface portions 24b. The outer surface portion 24a is a surface located at the axial center of the connecting column 22. The outer surface portion 24a is a cylindrical surface centered on the central axis C of the cage. The pair of concave curved surface portions 24b connects the axial end edge 24a1 of the outer surface portion 24a and the radial inner end edge 21a1 of the tip surface 21a of the pair of tip portions 21. The concave curved surface portion 24b is a circular arc centered on the central axis C of the cage in a cross section of a plane perpendicular to the central axis C of the cage. The concave curved surface portion 24b is a circular arc that contacts the outer surface portion 24a and the tip surface 21a in a cross section of a plane including the central axis C of the retainer.
As shown in FIG. 1, the radial position of the outer surface portion 24a is closer to the radial inner side 6b than the radial position of the pair of annular inner peripheral surfaces 10c. The pair of annular inner circumferential surfaces 10c are surfaces facing the radially inner side 6b of the pair of annular bodies 10.
The annular inner circumferential surface 10c is a cylindrical surface centered on the central axis C of the cage. The pair of second radial surfaces 20d and the inner surface 26 are flush with each other.

Furthermore, the connecting column 22 and the pair of protrusions 20 protrude more radially inward than the pair of annular inner circumferential surfaces 10c.
The radial position of the pair of second radial surfaces 20d and the radial position of the inner surface 26 of the connecting column 22 are closer to the radial inner side 6b than the radial position of the pair of annular inner peripheral surfaces 10c.

As shown in FIGS. 1 and 3, the pair of claw portions 16 protrude from the outer surface portion 24a toward the radially outer side 6a.
FIG. 4 is a cross-sectional view of the claw portion 16 when the roller bearing 1 is cut along a plane perpendicular to the central axis C.
As shown in FIGS. 3 and 4, each of the pair of claws 16 has a base 28 and a tip 30. As shown in FIGS.
A predetermined interval is provided between each axial side surface 16a of the pair of claw portions 16 and the pair of tip surfaces 21a. Thereby, the claw portion 16 can be elastically deformed over the entire region from the base portion 28 to the tip portion 30.

The base portion 28 is a plate-shaped member extending along the radial direction and the axial direction. The base portion 28 is connected to the outer surface portion 24a. The base portion 28 is provided so as to protrude from the outer surface portion 24a toward the radially outer side 6a. A portion of the base portion 28 that is connected to the outer surface portion 24a is a base end portion 28a.
The base end portion 28a is connected closer to the circumferential center of the column 12 (connecting column 22) than to the circumferential edge 24a2 of the outer surface portion 24a.
Further, the circumferential side surface 22b and the circumferential side surface 20b are flush with each other.
In the state of the inner ring assembly in which the retainer 6 and the plurality of rollers 7 are assembled to the inner ring 2, the rollers 4 do not contact the bases 28 of the claws 16, but contact the circumferential side surfaces 20b of the pair of protrusions 20. come into contact with
As shown in FIG. 4, the diameter of the circle connecting the radial position farthest from the center axis C of the outer surface portion 24a (outer surface 24) is smaller than the pitch diameter of the roller set of rollers 7 (the diameter of the pitch circle P). It's also small. The radial position of each outer surface portion 24a is closer to the radial inner side 6b than the radial position of the central axis n of the roller 7.
In addition, in FIG. 4, in order to facilitate understanding, arcuate portions such as the pitch circle P and the annular body 10 are shown as straight lines.

The distal end portion 30 is a plate-shaped member extending from the distal end 28b of the base portion 28. The distal end portion 30 is inclined toward the pocket 7 as it extends radially outward from the distal end 28b.
The diameter of the circle connecting the radial positions of the tips 28b of the base 28 is larger than the pitch diameter of the roller set of the rollers 7 (the diameter of the pitch circle P). The radial position of the tip 28b is closer to the radial outer side 6a than the radial position of the central axis n of the roller 7. Further, the tip 30a of the tip portion 30 is located closer to the pocket 7 than the circumferential side surface 22b and the circumferential side surface 20b.
Therefore, the tip portion 30 of the claw portion 16 prevents the roller 4 within the pocket 7 from slipping out radially outward.

In the method for manufacturing the inner ring assembly of the roller bearing 1 of this embodiment, the rollers 4 are inserted into the pockets 7 after the retainer 6 is arranged on the outer peripheral side of the inner ring 2 . The inner ring assembly includes an inner ring 2, a cage 6, and a plurality of rollers 4.
When obtaining the above-mentioned inner ring assembly, in order to insert the roller 4 into the pocket 7, the pair of claws 16 arranged with the pocket 7 in between are elastically deformed, and the distance between the claws 16 is expanded.

The radial position of the outer surface 24 (first surface) is closer to the radial inner side 6b (radial second side) than the radial position of the pair of first radial surfaces 20a of the pair of protrusions 20, Since the claw portion 16 is provided so as to protrude from the outer surface 24 toward the radially outer side 6a (radially first side), the roller bearing 1 of the first embodiment has the claw portion 16. can be suppressed from protruding largely from the radially outer surface toward the radially outer side 6a, and a larger radial length of the claw portion 16 can be ensured.
As a result, the roller bearing 1 of the first embodiment suppresses the protrusion of the claw portion 16 in the radial direction, and reduces the strain (elastic deformation amount) due to the elastic deformation of the claw portion 16 when the claw portion 16 is elastically deformed. ) can be made smaller.

Further, in this embodiment, the radial position of the outer surface portion 24a is closer to the radial inner side 6b than the radial position of the central axis n of the roller 7. The diameter of the circle connecting the radial position farthest from the center axis C of the outer surface portion 24a (outer surface 24) of each connecting column 22 is smaller than the pitch diameter of the roller set of rollers 7 (the diameter of the pitch circle P) .
However, the radial position of the outer surface portion 24a may coincide with the radial position of the central axis n of the roller 7, or may be closer to the radial outer side 6a than the radial position of the central axis n of the roller 7. You can.
However, when the radial position of the outer surface part 24a is set closer to the radially inner side 6b than the pitch circle P, the radial position of the outer surface part 24a is set closer to the radially outer side 6a than the radial position of the central axis n of the roller 7. Compared to the above case, protrusion of the claw portion 16 in the radial direction can be effectively suppressed, and the length of the claw portion 16 in the radial direction can be ensured to be larger.

Further, in this embodiment, the radial position of the outer surface portion 24a is closer to the radial inner side 6b than the radial position of the pair of annular inner peripheral surfaces 10c.
However, the radial position of the outer surface portion 24a may be the same as the radial position of the pair of annular inner circumferential surfaces 10c, or may be closer to the radial outer side 6a than the radial position c of the pair of annular inner circumferential surfaces 10. good.
However, if the radial position of the outer surface portion 24a is set closer to the radial inner side 6b than the radial position of the pair of annular inner circumferential surfaces 10c, the radial position of the outer surface portion 24a is closer to the radial direction of the pair of annular inner circumferential surfaces 10c. The length of the claw portion 16 in the radial direction can be ensured to be larger than that in the case where the radial position is the same as the radial position or closer to the radial outer side 6a than the radial position of the pair of annular inner circumferential surfaces 10c.

Furthermore, in this embodiment, the radial position of the inner surface 26 of the connecting column 22 is closer to the radial inner side 6b than the radial position of the pair of annular inner circumferential surfaces 10c.
However, the radial position of the inner surface 26 may be flush with the radial position of the pair of annular inner circumferential surfaces 10c, or may be closer to the radial outer side 6a than the radial position of the pair of annular inner circumferential surfaces 10c. good.
However, if the radial position of the inner surface 26 of the connecting column 22 is set closer to the radial inner side 6b than the radial position c of the pair of annular inner circumferential surfaces 10, Compared to the case where the radial position of the pair of annular inner circumferential surfaces 10c is flush with the circumferential surface 10c or closer to the radial outer side 6a, the radial length of the claw portion 16 is ensured to be larger while connecting. The thickness of the pillar 22 in the radial direction can be ensured appropriately.

[About the second embodiment]
FIG. 5 is a sectional view of the roller bearing 1 according to the second embodiment.
The roller bearing 1 of the second embodiment is different from the roller bearing 1 of the first embodiment in that the inner ring 2 does not have a rib, but a pair of ribs 3b are provided on the inner peripheral side of the outer ring 3. They are different.
In the roller bearing 1 of the second embodiment, the radial position of the inner surface 26 of the connecting column 22 of the retainer 6 is the same as the radial position of the pair of radial surfaces 20c facing radially inward 6b in the pair of protrusions 20. The claw portion 16 protrudes from the inner surface 26 toward the radially inner side 6b.

In the method for manufacturing the outer ring assembly of the roller bearing 1 of this embodiment, the rollers 4 are inserted into the pockets 7 while the cage 6 is disposed on the inner peripheral side of the outer ring 3. The outer ring assembly includes an outer ring 3, a cage 6, and a plurality of rollers 4.
Also in the case of this embodiment, the radial position of the inner surface 26 (first surface) is higher than the radial position of the pair of radial surfaces 20c of the pair of protrusions 20, and The roller bearing of the second embodiment 1 can prevent the claw portion 16 from protruding largely from the radially outer surface to the radially inner side 6b, and can ensure a larger radial length of the claw portion 16.
As a result, the roller bearing 1 of the second embodiment can suppress the protrusion of the claw portion 16 in the radial direction and reduce the strain caused by the elastic deformation of the claw portion 16 when the claw portion 16 is elastically deformed. Can be done.

〔others〕
The embodiments disclosed herein are illustrative in all respects and are not restrictive.
The scope of the present invention is not limited to the above-described embodiments, and includes all modifications within the scope of equivalents to the configurations described in the claims.

1 Roller bearing 2 Inner ring 3 Outer ring 6 Cage 6a Radial outer side 6b Radial inner side 7 Pocket 10 Annular body 10b Annular outer circumferential surface 10c Annular inner circumferential surface 12 Column 14 Column main body 16 Claw portion 20 Projection portion 20a First radial surface 20c Radial surface 21 Tip portion 22 Connecting column 24 Outer surface (first surface)
26 Inner surface (second surface)

Claims

An inner ring, an outer ring, a plurality of rollers interposed between the inner ring and the outer ring, and a resin retainer that holds the plurality of rollers at intervals along the circumferential direction,
The retainer includes a pair of annular bodies and a plurality of columns connecting the pair of annular bodies, and is surrounded by a pair of adjacent columns among the plurality of columns and the pair of annular bodies. the space is a pocket that holds the roller;
Each of the plurality of columns has a column main body and a claw portion provided on the column body to prevent the roller in the pocket from slipping out in the radial direction,
The column main body has a pair of protrusions extending in the axial direction from the pair of annular bodies, and a connecting column that connects the pair of protrusions,
The connecting column has a first surface facing a first radial side that is either a radially outer side or a radially inner side of the retainer,
The radial position of the first surface is greater than the radial position of the pair of radial surfaces facing toward the radial first side in the pair of protrusions, and the radial position is closer to the radial direction opposite to the radial first side. It is closer to the 2nd side,
The claw portion is a roller bearing provided so as to protrude from the first surface toward the first radial side.
Each of the pair of protrusions has a tip surface that connects the radial surface and the first surface,
The roller bearing according to claim 1, wherein a predetermined interval is provided between an axial side surface of the claw portion and the tip end surface.
The roller bearing according to claim 1 or 2, wherein the radial position of the first surface is closer to the second radial side than the radial position of the central axis of the plurality of rollers.
The roller according to claim 1, wherein the radial position of the first surface is closer to the second radial side than the radial position of the pair of annular surfaces facing toward the second radial side of the pair of annular bodies. bearing.
The connecting column has a second surface facing the second radial side,
The rolling element according to claim 1, wherein the radial position of the second surface is closer to the radial second side than the radial position of the pair of annular surfaces facing toward the radial second side of the pair of annular bodies. roller bearings.