JP2018132115A - Radial roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radial roller bearing in which disengagement of a roller from a pocket of a cage can be suppressed.SOLUTION: A radial roller bearing 1 comprises an outer ring 2 having a pair of rib parts 21, 22 protruding to the radial direction-inside from both ends of a cylindrical body part 20, a plurality of rollers 3, and a cage 4. The cage 4 has a pair of annular parts 41, 42 arranged inside a pair of the rib parts 21, 22, and a plurality of bar parts 43 for connecting a pair of the annular parts 41, 42 in an axial direction. The plurality of rollers 3 are accommodated respectively between a plurality of the bar parts 43. The bar parts 43 have heavy-walled parts 430 thicker than a pair of the annular parts 41, 42 in the radial direction, and a pair of connecting parts 431, 432 provided respectively between the heavy-walled parts 430 and a pair of the annular parts 41, 42. The radial direction-rigidity of a pair of the connecting parts 431, 432 is lower than those of the heavy-walled parts 430, and an outside diameter Dof the cage 4 in the heavy-walled parts 430 is larger than an outside diameter Dof the cage 4 in a pair of the annular parts 41, 42.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a radial roller bearing for supporting a rotating member to which a radial load in the radial direction is applied.

  Conventionally, a radial roller bearing capable of receiving a radial load in the radial direction is used for supporting a rotating member in, for example, an automobile transmission. Such a radial roller bearing includes a plurality of rollers, a cage that holds the plurality of rollers, and an outer ring that has a raceway surface on which the plurality of rollers roll. A pair of flanges projecting inward in the radial direction are provided at both axial ends of the outer ring, and the plurality of rollers and the cage are prevented from coming off from the outer ring by the pair of flanges. (For example, refer to Patent Document 1).

  The radial roller bearing described in Patent Document 1 is a shell-type needle roller bearing in which flanges at both ends of the outer ring are formed in a U shape by pressing a steel plate, and a plurality of needle rollers are in the axial direction of the outer ring. In FIG. 2, it arrange | positions between a pair of collar parts. The cage is formed by connecting a pair of annular portions provided at both end portions in the axial direction by a plurality of column portions extending in the axial direction, and needle rollers are respectively provided in a plurality of pockets formed between the plurality of column portions. Contained. When assembling the shell needle roller bearing, the needle roller elastically deforms the column portion and is inserted into the pocket from the inside of the cage.

JP 2009-168173 A

  The radial roller bearing (shell needle roller bearing) configured as described above has a cage inner diameter (D1 in FIG. 1A of Patent Document 1) of the outer ring, and a cage outer diameter (FIG. 1). It is formed larger than D2) in 1 (a), and the cage can rotate without causing frictional resistance to the outer ring by the gap due to the diameter difference. However, since the position of the needle roller relative to the outer ring is not restricted by the rotating member to be supported before the radial roller bearing is attached to the device to be attached such as a transmission, the retainer has an outer peripheral surface of the annular portion of the annular portion. It can move in the radial direction with respect to the outer ring until it comes into contact with the inner peripheral surface. For this reason, when the annular portion of the cage comes into contact with the flange portion of the outer ring, the distance between the outer circumferential surface of the cage and the inner circumferential surface of the outer ring is widened at the portion corresponding to the opposite side of the contact position. There is a risk that the needle roller in the detachment from the pocket to the outer ring side may cause a riding-up phenomenon in which the detached needle roller is caught between the retainer column part and the outer ring.

  Such a riding phenomenon is likely to occur particularly in a large-diameter radial roller bearing in which the ratio of the inner diameter of the raceway surface of the outer ring to the diameter of the needle roller is large. Further, since the radial roller bearing in which the ride-on phenomenon occurs cannot be attached to the attachment target device as it is, the needle roller must be manually returned to the pocket or the radial roller bearing must be discarded.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a radial roller bearing that can prevent the roller from being detached from the pocket of the cage.

  In order to achieve the above object, the present invention has a cylindrical main body portion having a raceway surface formed on an inner peripheral surface, and a pair of flange portions protruding radially inward from both axial ends of the main body portion. An outer ring, a plurality of rollers that roll on the raceway surface of the outer ring, and a cylindrical retainer that retains the plurality of rollers, the retainer being radially inward of the pair of flanges Each of the plurality of rollers in a plurality of pockets formed between the plurality of column portions, and a plurality of column portions that connect the pair of annular portions in the axial direction. Each of the column portions is provided between a thick portion having a larger radial thickness than the pair of annular portions, and between the axial end portions of the thick portion and the pair of annular portions. And a part of the outer diameter side of the thick part is disposed between the pair of flanges. Is, the connecting portion is lower than the stiffness thick portion in the radial direction, to provide a radial roller bearing.

  According to the radial roller bearing according to the present invention, it is possible to prevent the roller from separating from the pocket of the cage.

It is a perspective view which shows the radial roller bearing which concerns on embodiment of this invention. It is a perspective view which shows a part of holder | retainer. It is a fragmentary sectional view which shows a part of radial roller bearing in the cross section orthogonal to an axial direction. It is a fragmentary sectional view which shows a part of radial roller bearing in the cross section along an axial direction. (A)-(d) is explanatory drawing which shows the assembly procedure of a radial roller bearing.

[Embodiment]
An embodiment of the present invention will be described with reference to FIGS. In addition, although embodiment described below is shown as a suitable specific example in implementing this invention, although there are some parts which have illustrated various technical matters that are technically preferable. The technical scope of the present invention is not limited to this specific embodiment.

  FIG. 1 is a perspective view showing a radial roller bearing according to an embodiment of the present invention. The radial roller bearing 1 includes an outer ring 2, a plurality of rollers 3, and a cylindrical cage 4 that holds the plurality of rollers 3 inside the outer ring 2. Further, the radial roller bearing 1 can be rotated while receiving a radial load in the radial direction with a rotating member inserted inside the cage 4 with an outer ring 2 fixed to a case member (transmission case) of a transmission of an automobile, for example. Used to support. In FIG. 1, the central axis O of the cage 4 is indicated by a one-dot chain line. Hereinafter, a direction parallel to the central axis O is referred to as an axial direction.

  FIG. 2 is a perspective view showing a part of the cage 4. FIG. 3 is a partial cross-sectional view showing a part of the radial roller bearing 1 in a cross section orthogonal to the axial direction. FIG. 4 is a partial cross-sectional view showing a part of the radial roller bearing 1 in a cross section along the axial direction. FIG. 3 shows a partial cross section of the rotating member 5 supported by the radial roller bearing 1. In FIG. 4, a part of the roller 3 is broken, and the cage 4 on the back side of the roller 3 is indicated by a broken line. 3 and 4 show a state in which the central axis of the outer ring 2 and the central axis O of the cage 4 coincide with each other.

  In the present embodiment, the outer ring 2 and the roller 3 are made of steel, and the cage 4 is made of injection-molded resin. Specifically, polyamide 66 can be suitably used as the material of the cage 4. However, it is also possible to form the cage 4 from a steel material. The cage 4 has a symmetrical shape with respect to a virtual plane that bisects the cage 4 in the axial direction perpendicular to the central axis O of the cage 4.

  The outer ring 2 is formed by press forming of a steel plate, and as shown in FIG. 4, a cylindrical main body portion 20 and a pair of flange portions 21 and 22 protruding radially inward from both axial ends of the main body portion 20. Are integrated. Hereinafter, one of the pair of collars 21 and 22 is referred to as a first collar 21, and the other is referred to as a second collar 22. The first flange portion 21 is an annular plate-shaped end wall portion 211 extending radially inward from one axial end portion of the main body portion 20, and the radially inner side of the end wall portion 211. It consists of a short cylindrical folded piece 212 folded back from the end to the other side in the axial direction (the second flange 22 side). Similarly, the second flange portion 22 has an annular plate-shaped end wall portion 221 extending radially inward from the other axial end portion of the main body portion 20, and the radial direction of the end wall portion 221. It consists of a short cylindrical folded piece 222 folded back from the inner end to one axial side (the first flange 21 side).

  The roller 3 is a cylindrical (needle-shaped) rolling element held by the cage 4 so that a direction parallel to the axial direction of the outer ring 2 is a longitudinal direction, and a part of the circumferential direction of the roller 3 is a first flange. It arrange | positions between the part 21 and the 2nd collar part 22. FIG. The main body portion 20 of the outer ring 2 has a part of its inner peripheral surface formed as a raceway surface 20 a for rolling the plurality of rollers 3. As shown in FIG. 3, the plurality of rollers 3 are arranged between the outer peripheral surface 5 a of the rotating member 5 that is a supported body and the main body portion 20 of the outer ring 2, and roll on the raceway surface 20 a to rotate the rotating member. 5 is smoothly rotated with respect to the outer ring 2.

  The cage 4 integrally includes a pair of annular portions 41 and 42 provided at both axial ends, and a plurality of column portions 43 that connect the pair of annular portions 41 and 42 in the axial direction. The pair of annular portions 41 and 42 are disposed on the radially inner side of the first and second flange portions 21 and 22 in the outer ring 2. Hereinafter, of the pair of annular portions 41, 42, one annular portion 41 disposed on the radially inner side of the first flange portion 21 is referred to as a first annular portion 41, and the second flange portion 22 The other annular portion 42 arranged on the radially inner side is referred to as a second annular portion 42.

The first annular portion 41 has a short cylindrical shape having an outer diameter smaller than the inner diameter of the first flange portion 21, and the second annular portion 42 has an outer diameter smaller than the inner diameter of the second flange portion 22. It is a short cylinder shape having. In the present embodiment, the inner diameter of the first flange 21 and the inner diameter of the second flange 22 are equal to each other. The outer diameter and inner diameter of the first annular portion 41 and the outer diameter and inner diameter of the second annular portion 42 are equal to each other, and the radial thickness of the cage 4 in the first and second annular portions 41 and 42 is the same. Are the same. In FIG. 4, the inner diameter of the first and second flange portions 21 and 22 (the inner diameter of the folded pieces 212 and 222) in the outer ring 2 is indicated by D ₁ . The outer and inner diameters of the first and second annular portions 41 and 42 in the cage 4 are indicated by D ₂ and D ₃ , respectively. Cage 4, a distance corresponding to the difference between the outer diameter D ₂ of the first and second annular portions 41, 42 to the inner diameter D ₁ of the first and second flange portions 21, the diameter with respect to the outer ring 2 It can move in the direction.

  The plurality of pillar portions 43 extend in the axial direction between the first annular portion 41 and the second annular portion 42, and between the two pillar portions 43 adjacent in the circumferential direction, the plurality of rollers 3. A plurality of pockets 40 are formed to accommodate each of them. The thickness of the pocket 40 in the radial direction of the cage 4 (thickness of the thick portion 430 of the column portion 43 described later) is smaller than the diameter of the roller 3, and a part of the roller 3 is radially outward from the pocket 40. The other part of the roller 3 protrudes from the pocket 40 to the radially inner side of the cage 4. The plurality of rollers 3 are accommodated one by one in the pocket 40 of the cage 4 and can roll in the pocket 40.

  The column part 43 includes a thick part 430 having a larger radial thickness than the first and second annular parts 41, 42, both axial ends of the thick part 430, and the first and second annular parts 41, 42, a pair of connecting portions 431 and 432 provided between them. Hereinafter, of the pair of connection parts 431 and 432, one connection part 431 that connects one end of the thick part 430 and the first annular part 41 is referred to as a first connection part 431, and the other of the thick part 430. The other connecting portion 432 that connects the end and the second annular portion 42 is referred to as a second connecting portion 432.

In FIG. 4, the outer diameter and inner diameter in the thick part 430 of the cage 4 are indicated by D ₄ and D ₅ , respectively. The outer diameter D ₄ of the retainer 4 in the thick wall portion 430 is larger than the outer diameter D ₂ of the retainer 4 in the first and second annular portions 41 and 42, and the retainer 4 has an outer diameter in the center in the axial direction. It is a two-stage shape that increases in size. Further, the outer diameter D ₄ of the cage 4 in the thick part 430 is larger than the inner diameter D _{1 of} the first and second flange parts 21. For this reason, a part of the outer diameter side of the thick portion 430 is disposed between the first flange portion 21 and the second flange portion 22 of the outer ring 2. Furthermore, the inner diameter D ₅ of the thick part 430 of the cage 4 is formed larger than the inner diameter D _{3 of} the first and second annular parts 41, 42. The radial dimensions D _{1 to} D ₅ of these parts have a relationship that satisfies the following inequality (1).
D ₃ <D ₅ <D ₂ <D ₁ <D ₄ (1)

  The thick part 430 has a rod shape with a constant thickness in the radial direction of the cage 4, and projections 44 that prevent the rollers 3 from coming out of the pocket 40 are provided integrally with the thick part 430 at both ends in the axial direction. ing. The protrusions 44 are provided at the radially inner ends of the both side surfaces 430 a of the thick wall portion 430 constituting the inner surface of the pocket 40, and project from the both side surfaces 430 a along the circumferential direction of the cage 4. The distance d (see FIG. 3) between the tip portions of the protrusions 44 facing each other in the two adjacent column portions 43 is smaller than the diameter D of the roller 3 accommodated in the pocket 40 between the two adjacent column portions 43. . As a result, the rollers 3 are prevented from falling out of the pocket 40 to the inside of the cage 4.

Further, the diameter D of the roller 3 is larger than a half of the difference between the outer diameter D ₄ and the inner diameter D ₅ in the thick part 430 of the cage 4. That is, the outer diameter D ₄ and inner diameter D ₅ in the thick part 430 of the cage ₄ and the diameter D of the roller 3 have a relationship satisfying the following inequality (2).
D> (D ₄ -D ₅ ) / 2 (2)

  In the first and second connecting portions 431 and 432, the radial rigidity of the cage 4 is lower than the rigidity of the thick portion 430. That is, the first and second connecting portions 431 and 432 are formed as weak portions in the column portion 43, and are more easily elastically deformed in the radial direction of the cage 4 than the thick portion 430. In the present embodiment, the thickness of the first and second connecting portions 431 and 432 in the radial direction of the cage 4 is smaller than the thickness of the thick portion 430 in the same direction, whereby the first and second connecting portions. The rigidity of 431 and 432 is lower than the rigidity of the thick part 430.

The outer peripheral surface 431a of the first connecting portion 431 in the cage 4 has a tapered shape in which the outer diameter increases toward the thick portion 430 side. A part of the outer peripheral surface 431 a faces the first flange portion 21 of the outer ring 2 in the axial direction and faces the main body portion 20 of the outer ring 2 in the radial direction. Further, the inner peripheral surface 431b of the first connecting portion 431 of the cage 4, one of the thick portion 430 side to the inner diameter D ₅ of the thick portion 430 made from the cylindrical surface of the same diameter, the first annular portion It consists of a conical surface whose outer diameter gradually decreases as the other side on the 41 side approaches the second annular portion 42.

Similarly, the outer peripheral surface 432a of the second connecting portion 432 in the cage 4 has a tapered shape in which the outer diameter increases toward the thick portion 430 side. A part of the outer peripheral surface 432a faces the second flange portion 22 of the outer ring 2 in the axial direction and faces the main body portion 20 of the outer ring 2 in the radial direction. Further, the inner peripheral surface 432b of the second coupling portion 432 of the cage 4, one of the thick portion 430 side to the inner diameter D ₅ of the thick portion 430 made from the cylindrical surface of the same diameter, the second annular portion As the other side on the 42 side approaches the second annular portion 42, the outer diameter gradually decreases.

  A concave portion 431 c for reducing the rigidity of the first connecting portion 431 is formed on the outer peripheral surface 431 a of the first connecting portion 431. In the present embodiment, three concave portions 431 c are formed on the outer peripheral surface 431 a of the first connecting portion 431. Each recessed part 431c is a groove | channel shape extended in the circumferential direction of the holder | retainer 4, and the cross-sectional shape is a semicircle shape as shown in FIG.

  Similarly, a concave portion 432 c that reduces the rigidity of the second connecting portion 432 is formed on the outer peripheral surface 432 a of the second connecting portion 432. In the present embodiment, three concave portions 432 c are formed on the outer peripheral surface 432 a of the second connecting portion 432. Each recessed part 432c is a groove | channel shape extended in the circumferential direction of the holder | retainer 4, and the cross-sectional shape is semicircle shape.

  The length L (see FIG. 2) of the concave portions 431c and 432c in the circumferential direction of the cage 4 is shorter than the circumferential width W (see FIG. 2) of the first and second connecting portions 431 and 432, and the concave portion 431c. , 432 c does not communicate with the pocket 40. The shapes of the recesses 431c and 432c are not limited to those described above, and may be, for example, a groove shape extending along the axial direction. You may form the recessed part which reduces the rigidity of the 1st and 2nd connection parts 431 and 432 in the internal peripheral surfaces 431b and 432b.

(Assembly method of radial roller bearing 1)
Next, a method for assembling the radial roller bearing 1 will be described with reference to FIG. FIG. 5 is an explanatory view showing the procedure for assembling the radial roller bearing 1.

  The radial roller bearing 1 is performed by inserting the plurality of rollers 3 into the pocket 40 from the inner side of the cage 4 after assembling the cage 4 on the inner side of the outer ring 2. 5A to 5C show a process of assembling the cage 4 to the outer ring 2, and FIG. 5D shows a process of mounting the plurality of rollers 3 to the cage 4.

  When the retainer 4 is assembled to the outer ring 2, the outer ring 2 and the retainer 4 are arranged side by side in the axial direction, and the retainer 4 is inserted into the inner side of the main body 20 of the outer ring 2 while being reduced in diameter by elastic deformation. To do. In the following description, the case where the cage 4 is inserted from the second flange portion 22 side of the outer ring 2 will be described. However, the present invention is not limited to this, and the cage 4 is inserted from the first flange portion 21 side. Also good.

  In FIG. 5A, the outer peripheral surface 431 a of the first connecting portion 431 of the cage 4 is in contact with the corner R portion 22 a between the end wall portion 221 and the folded piece 222 in the second flange portion 22. Is shown. In the cage 4, the outer peripheral surface 431 a of the first connecting portion 431 comes into contact with the corner R portion 22 a, so that the first connecting portion 431 is elastically deformed radially inward to reduce the diameter. The corner R portion 22a is formed in an arc shape in a cross section along the axial direction.

FIG. 5B shows a state in which the outer peripheral surface 430 b of the thick portion 430 in the column portion 43 of the cage 4 is in contact with the inner peripheral surface 222 a of the folded piece 222 in the second flange portion 22. At this time, the cage 4, by the elastic deformation of the first and second connecting portions 431 and 432, the outer diameter of the thick portion 430 of the plurality of pillar portions 43 is equal to the inner diameter _{D 1} of the second flange portion 22 The diameter is reduced.

FIG. 5C shows a state in which the column part 43 of the cage 4 has passed through the inner side of the second flange part 22. In this state, the cage 4 is in a natural state where it is not compressed by the outer ring 2, and the outer diameters of the thick wall portions 430 of the plurality of column portions 43 become the size before deformation (D ₄ shown in FIG. ₄ ).

  FIG. 5D shows a state in which the roller 3 is mounted on the cage 4. The roller 3 is attached to the cage 4 in a state where the cage 4 is arranged on the inner side of the outer ring 2 and the width of the pocket 40 in the circumferential direction of the cage 4 is expanded by elastic deformation of the column portion 43. Done. At this time, the column portion 43 is elastically deformed until the distance d between the tip portions of the two projections 44 facing the circumferential direction of the cage 4 becomes equal to the diameter D of the roller 3, and the roller 3 is between the two projections 44. After passing, the distance d between the tips of the protrusions 44 is restored to the state before deformation. Then, when all the rollers 3 are mounted on the cage 4, the radial roller bearing 1 is completed. In FIG. 5D, the roller 3 before being inserted into the pocket 40 is indicated by a two-dot chain line, and the roller 3 inserted into the pocket 40 is indicated by a solid line.

(Operation and effect of the embodiment)
According to the present embodiment described above, the following operations and effects can be obtained.

(1) In the present embodiment, the outer diameter D ₄ of the cage 4 in the thick portion 430 of the column portion 43 is larger than the outer diameter D ₂ of the cage ₄ in the first and second annular portions 41, 42. . Thereby, the thickness of the pocket 40 in the radial direction of the cage 4 is increased as compared with the case where the outer diameter of the column portion and the outer diameter of the annular portion are the same as in a conventional radial roller bearing, for example. Thereby, the space | interval of the raceway surface 20a of the outer ring | wheel 2 and the holder | retainer 4 becomes narrow, and it suppresses that the roller 3 detach | leaves from the pocket 40 of the holder | retainer 4 to the radial direction outer side (outer ring | wheel 2 side). Can do. For this reason, it is possible to prevent the occurrence of the riding-up phenomenon in which the separated roller 3 is caught between the pillar portion 43 of the retainer 4 and the outer ring 2.

(2) Since the first and second connecting portions 431 and 432 of the pillar portion 43 are thinner in the radial direction of the cage 4 than the thick portion 430 and less rigid than the thick portion 430, the outer ring 2 When inserting the retainer 4 on the inner side, the plurality of column portions 43 can be easily bent radially inward, and as a result, the thick portion 430 can be reduced in diameter. Thereby, it becomes possible to make workability | operativity at the time of the assembly of the radial roller bearing 1 favorable. Moreover, since the recessed parts 431c and 432c which further reduce the rigidity in the radial direction of the cage 4 are formed in the first and second connecting parts 431 and 432, the plurality of column parts 43 can be more easily deformed. It becomes possible.

(3) The outer diameter D ₄ of the cage 4 in the thick part 430 is larger than the inner diameter D ₁ of the first and second flange parts 21 and 22 of the outer ring 2. Therefore, when the plurality of rollers 3 are mounted on the cage 4, the cage 4 does not come out of the outer ring 2, and the work of mounting the plurality of rollers 3 can be easily performed.

(4) The outer peripheral surfaces 431a and 432a of the first and second connecting portions 431 and 432 in the cage 4 are tapered so that the thicker portion 430 has a larger outer diameter. Therefore, the diameter of the cage 4 can be reduced by moving the cage 4 relative to the outer ring 2 in the axial direction, and the work of inserting the cage 4 on the inner side of the outer ring 2 can be easily performed. It becomes possible.

(5) Since the protrusions 44 for preventing the rollers 3 from coming off are provided on the end portions on the inner diameter side of the thick portion 430 having a relatively high rigidity, the rollers 3 hold the rollers 43. It is possible to more surely prevent the container 4 from slipping out to the inner side.

(6) Since the first and second annular portions 41, 42 and the plurality of column portions 43 are made of an integral resin, the cage 4 is inserted into the inner side of the outer ring 2, and When the plurality of rollers 3 are inserted into the pocket 40 and attached to the cage 4, the cage 4 can be easily elastically deformed.

  As mentioned above, although this invention was demonstrated based on embodiment, these embodiment does not limit the invention which concerns on a claim. In addition, it should be noted that not all the combinations of features described in the embodiments are essential to the means for solving the problems of the invention. Further, the present invention can be appropriately modified and implemented without departing from the spirit of the present invention. For example, the number of rollers 3 and the dimensions or materials of the inner and outer diameters of the outer ring 2 and the cage 4 can be determined as appropriate depending on the required load resistance and the size of the rotating member to be supported.

DESCRIPTION OF SYMBOLS 1 ... Radial roller bearing 2 ... Outer ring 20 ... Main-body part 20a ... Raceway surface 21 ... 1st collar part 22 ... 2nd collar part 3 ... Roller 4 ... Cage 40 ... Pocket 41 ... 1st annular part 42 ... 1st Two annular parts 43 ... pillar part 430 ... thick part 431 ... first connecting part 432 ... second connecting part 431a, 432a ... outer peripheral surface 431c, 432c ... recessed part 44 ... projection

Claims (7)

An outer ring having a cylindrical main body portion with a raceway surface formed on the inner peripheral surface, and a pair of flanges projecting radially inward from both axial ends of the main body portion;
A plurality of rollers rolling on the raceway surface of the outer ring;
A cylindrical retainer for retaining the plurality of rollers,
The retainer has a pair of annular portions respectively disposed on the radially inner side of the pair of flange portions, and a plurality of column portions that connect the pair of annular portions in the axial direction. The plurality of rollers are respectively accommodated in a plurality of pockets formed between the pillar portions,
The column portion is a thick portion having a larger radial thickness than the pair of annular portions, and a pair of connecting portions provided between the axial end portions of the thick portion and the pair of annular portions, respectively. And
The pair of connecting parts has a radial rigidity lower than that of the thick part,
The outer diameter of the cage in the thick wall portion is larger than the outer diameter of the cage in the pair of annular portions,
Radial roller bearing. The diameter of the roller is larger than one half of the difference between the outer diameter and the inner diameter of the thick part of the cage,
The radial roller bearing according to claim 1. An outer diameter of the cage in the thick wall portion is larger than an inner diameter of the pair of flange portions of the outer ring,
The radial roller bearing according to claim 1 or 2. The outer peripheral surface of the connecting portion in the cage is a tapered shape whose outer diameter increases toward the thick portion side,
The radial roller bearing according to any one of claims 1 to 3. A concave portion is formed in the connecting portion,
The radial roller bearing according to any one of claims 1 to 4. Two adjacent pillars are provided with protrusions facing each other at the radially inner end,
The distance between the protrusions of the two adjacent column parts is smaller than the diameter of the roller accommodated in the pocket between the two adjacent column parts,
The radial roller bearing according to any one of claims 1 to 5. The retainer is made of a resin in which the pillar portion and the pair of annular portions are integrated.
The radial roller bearing according to any one of claims 1 to 6.

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