JP2014119030A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily assemble a cage having flange portions between inner and outer rings having U-type grooves by simple means.SOLUTION: In a rolling bearing which includes an inner ring 12 and an outer ring 14 rotated relatively to each other, a plurality of rolling elements 15 disposed between the inner ring 12 and the outer ring 14, and a cage 16 disposed between the inner ring 12 and the outer ring 14 and holding the rolling elements 15 at equal intervals in the circumferential direction, and in which U-type grooves 24 and 25 having the U-shaped cross section are annularly formed on an axial end portion of an outer diameter face of the inner ring 12 and an axial end portion of an inner diameter face of the outer ring 14, flange portions 20 and 21 radially extending and accommodated in the U-type groove 24 of the inner ring 12 and the U-type groove 25 of the outer ring 14 are disposed at an inner diameter side and an outer diameter of the axial end portion of the cage 16, and slits 26 and 27 cut in the radial direction are formed on the flange portions 20 and 21.

Description

  The present invention relates to a rolling bearing in which a synthetic resin cage that holds a rolling element so as to roll freely is incorporated between an inner ring and an outer ring.

  For example, various rolling bearings such as deep groove ball bearings and angular ball bearings are widely used for gear support shafts of transmissions of vehicles having motors.

  As shown in FIG. 6, this type of rolling bearing is disposed on the outer surface of an inner ring 112 having an inner rolling surface 111 formed on the outer diameter surface and on the outer side of the inner ring 112, and an outer rolling surface 113 is formed on the inner diameter surface. Between the inner ring 112 and the outer ring 114, and a plurality of rolling elements 115 movably interposed between the inner rolling surface 111 of the inner ring 112 and the outer rolling surface 113 of the outer ring 114. The main part is comprised by the seal | sticker 116 distribute | arranged and hold | maintain each rolling element 115 at the circumferential direction equal intervals, and the sealing member 117 distribute | arranged to the annular space formed between the inner ring | wheel 112 and the outer ring | wheel 114. Either the outer ring 114 or the inner ring 112 is attached to a fixed part such as a housing, and the other is attached to a rotating part such as a rotating shaft.

  In an electric vehicle or a hybrid vehicle in which such a rolling bearing is used, since high-speed motor rotation is input, a rotating portion such as a rotating shaft tends to be high-rotation, so it is made of a lightweight synthetic resin. A cage 116 is incorporated (see, for example, Patent Document 1). The cage 116 disclosed in Patent Document 1 is a pair of main part 118 having an annular shape, and a pair of protrusions integrally provided at equal intervals in the circumferential direction at intervals on one axial surface of the main part 118. Each of the elastic pieces 119 is provided with a pocket 120 which is recessed between the pair of elastic pieces 119 and opened to the outer diameter side and the inner diameter side. It has a crown shape to hold.

  On the other hand, this rolling bearing is provided with the above-described seal member 117 so that rainwater, dust, or the like does not enter the inside of the bearing, or a lubricant such as grease does not leak from the inside of the bearing. The seal member 117 includes an annular metal core 121 and a rubber-like member 122 that is integrally fixed to the metal core 121. In the case of an inner ring rotating type rolling bearing in which the outer ring 114 is mounted on the fixed portion and the inner ring 112 is mounted on the rotating portion, the seal member 117 is formed on the inner diameter surface of the outer ring 114 and has a U-shaped cross section. An outer peripheral part is fixed to the mold groove 123 in a fitted state. The inner ring 112 is formed with a U-shaped groove 123 having a U-shaped cross section at a position corresponding to the inner peripheral portion of the seal member 117, and a seal lip 125 formed on the inner peripheral portion of the seal member 117 is a U-shape of the inner ring 112. It is in sliding contact with the mold groove 123.

  In the rolling bearing provided with the crown-shaped cage 116 disclosed in Patent Document 1, the rolling element 115 is held from only one side as described above. As a result, when a large centrifugal force is applied, the rolling element 115 may fall out of the pocket 120 due to uneven deformation of the cage 116, or may interfere with other parts such as the inner and outer rings 112 and 114. In order to eliminate such concerns, various rolling bearings including axially symmetrical cages made of lightweight synthetic resin have been proposed for the purpose of suppressing deformation due to centrifugal force under high-speed rotation ( For example, see Patent Document 2).

  As shown in FIG. 7, the rolling bearing disclosed in Patent Document 2 is arranged between an inner ring 212 and an outer ring 214, and includes an inner rolling surface 211 of the inner ring 212 and an outer rolling surface 213 of the outer ring 214. A cage 216 for holding a plurality of rolling elements 215 interposed between them at equal intervals in the circumferential direction is provided. The retainer 216 has hemispherical pockets 219 for accommodating the rolling elements 215 formed in a plurality of locations in the circumferential direction on opposing surfaces 218 of the pair of annular bodies 217 facing in the axial direction, and each opposing surface 218 of the annular body 217. And a pair of annular bodies 217 are joined together.

  When the rolling bearing is used under oil bath lubrication, the rotating cage 216 acts like a compressor of the pump, and excessive lubricant is passed into the bearing through the inner and outer rings 212 and 214 and the cage 216. Since it is drawn and stirred by the rolling elements 215 and the cage 216 inside the bearing, the torque (heat generation) of the bearing increases due to the stirring resistance. For this reason, the rolling bearing has the following structure as means for restricting the inflow of lubricant into the bearing. The flange portions 220 and 221 extending in the radial direction are integrally provided on the inner diameter side and the outer diameter side of the axial end portion of the annular body 217 constituting the cage 216, and the flange portions 220 and 221 of the inner ring 212 and the outer ring 214 are integrally provided. And L-shaped grooves 224 and 225 having an L-shaped cross section are formed in the corresponding portions. Thus, the labyrinths 222 and 223 are configured by the flange portions 220 and 221 and the L-shaped grooves 224 and 225.

  As described above, the cage 216 has an axially symmetrical shape in which the flanges 220 and 221 are provided at the axial ends of the pair of annular bodies 217. Therefore, when the centrifugal force is applied under high-speed rotation, the cage 216 The ring bodies 217 can suppress the deformation of the retainer 216 with each other, so that the rolling element 215 falls out of the pocket 219 or interferes with other parts such as the inner and outer rings 212 and 214. Can be avoided. In addition, the labyrinths 222 and 223 formed by the flange portions 220 and 221 of the cage 216 and the L-shaped grooves 224 and 225 of the inner and outer rings 212 and 214 reliably prevent the lubricant from flowing excessively into the bearing. I can do it.

JP 2012-172834 A JP 2012-67826 A

  By the way, in the conventional rolling bearing disclosed in the above-mentioned Patent Document 2, a structure in which the flanges 220 and 221 are provided at the axial ends of the cage 216 for the purpose of restricting the inflow of the lubricant into the bearing. It has. When the cage 216 having the flanges 220 and 221 is assembled between the inner and outer rings 212 and 214, the pair of annular bodies 217 are brought close to each other from the outside in the axial direction, and the opposing surfaces 218 are brought into contact with each other to make a pair of annular rings. The body 217 is joined. At this time, since it is necessary to avoid interference with the flanges 220 and 221, the L-shaped grooves 224 and 225 are formed in portions corresponding to the flanges 220 and 221 of the inner ring 212 and the outer ring 214. The L-shaped grooves 224 and 225 are composed of an outer diameter surface and an inner diameter surface along the axial direction, and an end surface orthogonal to the outer diameter surface and the inner diameter surface (see FIG. 7).

  In order to form the L-shaped grooves 224 and 225 having such a shape on the outer diameter surface of the inner ring 212 and the inner diameter surface of the outer ring 214, a dedicated groove process is required. Will be invited. On the other hand, when the cage 216 having the flange portions 220 and 221 is to be incorporated into a rolling bearing (see FIG. 6) as in Patent Document 1 that does not require dedicated groove processing, the axial direction of the inner ring 112 and the outer ring 114 Since the U-shaped grooves 123 and 124 are formed at the ends, the flange portions 220 and 221 of the retainer 216 are connected to the inner ring 112 and the outer ring 114 when the pair of annular bodies 217 are joined close to each other from the outside in the axial direction. Of the U-shaped grooves 123 and 124 in the axial direction. This interference may damage the flanges 220 and 221, making it difficult to assemble the cage 216 between the inner ring 112 and the outer ring 114.

  Therefore, the present invention has been proposed in view of the above-described improvements, and the object of the present invention is to easily assemble a cage having a flange between inner and outer rings having a U-shaped groove by a simple means. It is to provide a rolling bearing to obtain.

  As technical means for achieving the above-mentioned object, the present invention is arranged between an inner ring and an outer ring that rotate relative to each other, a plurality of rolling elements interposed between the inner ring and the outer ring, and an inner ring and an outer ring. A rolling bearing comprising a cage that holds the rolling elements at equal intervals in the circumferential direction, and an annular U-shaped groove having a U-shaped cross section at the axial end of the inner ring or outer ring, At least one of the axial end portion of the cage in the inner diameter side or outer diameter side is provided with a collar portion extending in the radial direction and accommodated in the U-shaped groove of the inner ring or outer ring, and the slit cut in the radial direction is It was formed in the part. “At least one of the inner diameter side and the outer diameter side” means that when the collar portion is provided only on the inner diameter side, when the collar portion is provided only on the outer diameter side, the collar portion is provided on both the inner diameter side and the outer diameter side. It means to include all of the cases.

  In the present invention, a flange portion extending in the radial direction and accommodated in the U-shaped groove of the inner ring or the outer ring is provided on at least one of the inner diameter side and the outer diameter side of the axial end portion of the cage, and is cut in the radial direction. By forming the slits on the collar part, the rigidity of the collar part can be reduced as compared with the collar part without the slit. As a result, when the cage is incorporated into the rolling bearing, even if the collar portion interferes with the axially outer side portion of the U-shaped groove of the inner ring or the outer ring, the collar portion is deformed by the slit so that the collar portion is deformed by the slit. Can be easily accommodated in the U-shaped groove.

  As for the slit in this invention, the structure provided in the multiple places along the circumferential direction of a collar part is desirable. Thus, if the slit is provided at a plurality of locations along the circumferential direction of the collar part, it becomes easy to reduce the rigidity of the collar part. The slits in the present invention preferably have a structure provided at equal intervals along the circumferential direction of the collar portion. Thus, if a slit is provided in the circumferential direction of a collar part at equal intervals, a collar part can be deform | transformed uniformly over a perimeter and the improvement of the assembly | attachment property of a holder | retainer can be aimed at.

  The cage according to the present invention forms a pair of annular bodies by forming hemispherical pockets for accommodating rolling elements at a plurality of locations in the circumferential direction on opposing surfaces of a pair of annular bodies facing each other in the axial direction. A combined structure is desirable. By adopting such a structure, when centrifugal force is applied under high-speed rotation, the pair of annular bodies can suppress the deformation of each other, thereby suppressing the deformation of the entire cage. It is possible to avoid dropping from the pocket and interfering with other parts such as inner and outer rings.

  The cage in the present invention is preferably made of a synthetic resin in that the weight can be reduced. Further, this cage is preferably molded from any one synthetic resin selected from PPS, PA66, and PA46 in consideration of cost and oil resistance.

  According to the present invention, at least one of the inner diameter side and the outer diameter side of the axial end of the cage is provided with a flange portion that extends in the radial direction and is accommodated in the U-shaped groove of the inner ring or outer ring, and is cut in the radial direction. By forming the inserted slit in the collar part, the rigidity of the collar part can be made lower than that of the collar part without the slit. As a result, when the cage is incorporated into the rolling bearing, even if the collar portion interferes with the axially outer side portion of the U-shaped groove of the inner ring or the outer ring, the collar portion is deformed by the slit so that the collar portion is deformed by the slit. Can be easily accommodated in the U-shaped groove.

  As a result, it is not necessary to manufacture inner and outer rings having L-shaped grooves formed by dedicated groove processing, and a cage having a flange is assembled to inner and outer rings having U-shaped grooves that do not require dedicated groove processing. Therefore, it is possible to provide a rolling bearing for automobiles suitable for a high rotation bearing used in an electric vehicle or a hybrid vehicle. Further, in the rolling bearing as the high-rotation bearing, since the L-shaped groove is changed to the U-shaped groove, the lubricant flowing into the bearing can be further restricted, and further reduction in torque can be easily realized.

It is a fragmentary sectional view showing a rolling bearing in an embodiment of the present invention. It is an assembly exploded perspective view which shows a pair of annular body which comprises the holder | retainer of FIG. FIG. 2 is an assembled perspective view showing a pair of annular bodies constituting the cage of FIG. 1. It is an enlarged side view which shows the opposing surface of the annular body which comprises the holder | retainer of FIG. It is an enlarged side view which shows the opposite surface of the annular body which comprises the holder | retainer of FIG. It is a partial expanded sectional view which shows the prior art example of a rolling bearing. It is a partial expanded sectional view which shows the other conventional example of a rolling bearing.

  Embodiments of the rolling bearing according to the present invention will be described in detail below. The rolling bearing of this embodiment is particularly suitable for a high-speed rotary bearing for automobiles used under oil bath lubrication in an electric vehicle or a hybrid vehicle.

  As shown in FIG. 1, the rolling bearing of this embodiment has an inner ring 12 in which an inner rolling surface 11 is formed on an outer diameter surface, and an outer rolling surface 13 on an inner diameter surface that is disposed outside the inner ring 12. Between the formed outer ring 14, a plurality of rolling elements 15 movably interposed between the inner rolling surface 11 of the inner ring 12 and the outer rolling surface 13 of the outer ring 14, and between the inner ring 12 and the outer ring 14. The main part is comprised with the holder | retainer 16 which is distribute | arranged and hold | maintains each rolling element 15 at the circumferential direction equal intervals. Either the inner ring 12 or the outer ring 14 is attached to a fixed part such as a housing, and the other is attached to a rotating part such as a rotating shaft.

  This rolling bearing includes a cage 16 made of a lightweight synthetic resin for the purpose of suppressing deformation of the cage 16 due to centrifugal force under high-speed rotation. FIG. 2 shows a state before the pair of annular bodies 17 are joined, and FIG. 3 shows a state after the pair of annular bodies 17 are joined. 4 shows the facing surface of the annular body 17, and FIG. 5 shows the opposite surface of the annular body 17. As shown in FIGS. 2 to 5, the retainer 16 includes a hemispherical pocket 19 that accommodates the rolling elements 15 (see FIG. 1) on the opposed surfaces 18 of the pair of annular bodies 17 facing in the axial direction. It is formed in a plurality of locations, and has an axially symmetric shape in which the opposing surfaces 18 of the annular body 17 are abutted and a pair of annular bodies 17 are joined.

  The cage 16 of this rolling bearing has a pair of annular bodies 17 coupled with the following structure. Each of the pair of annular bodies 17 has an outer diameter side convex portion 31 formed by extending the outer diameter side of one circumferential end of the pocket 19 in the axial direction, and an inner diameter side concave portion 32 by denting the inner diameter side. And the inner diameter side of the other circumferential end of the pocket 19 is extended in the axial direction to form the inner diameter side convex portion 33 and the outer diameter side is recessed to form the outer diameter side concave portion 34. (See FIG. 2). By adopting such a structure, it is possible to make one annular body 17 and the other annular body 17 by using a kind of annular body 17 manufactured by one mold, and the product cost can be reduced.

  In this structure, the outer diameter side convex portion 31 of one annular body 17 is inserted into the outer diameter side concave portion 34 of the other annular body 17, and the inner diameter side convex portion 33 of one annular body 17 is inserted into the other annular body 17. By inserting into the inner diameter side concave portion 32, the outer diameter side convex portion 31 and the inner diameter side convex portion 33 are engaged in the axial direction with a predetermined tightening margin (see FIG. 3). Thus, by providing the joint part which consists of the outer diameter side convex part 31, the inner diameter side recessed part 32, the inner diameter side convex part 33, and the outer diameter side recessed part 34 in the circumferential direction both ends of the pocket 19 of the annular body 17, When a large centrifugal force is applied due to high rotation, even if one annular body 17 and the other annular body 17 are spaced apart from each other in the axial direction and the pocket 19 is to be opened, the rolling element 15 is moved by the above-described coupling portion. The state accommodated in the pocket 19 is maintained.

  When this rolling bearing is used under oil bath lubrication, the rotating cage 16 acts like a pump compressor, and the lubricant is drawn into the bearing through the inner and outer rings 12 and 14 and the cage 16. It is. Therefore, the rolling bearing of this embodiment has the following structure as means for limiting the inflow of lubricant into the bearing. The flanges 20 and 21 extending in the radial direction are provided on the inner diameter side and the outer diameter side of the end portion in the axial direction of the annular body 17, and the portions corresponding to the flange portions 20 and 21 of the inner ring 12 and the outer ring 14, that is, the inner ring 12. U-shaped grooves 24 and 25 in which the flange portions 20 and 21 are accommodated are formed at the axial end portion of the outer diameter surface and the axial end portion of the inner diameter surface of the outer ring 14.

  Note that the U-shaped grooves 24 and 25 are configured so that the seal lip 125 of the seal member 117 is the shaft of the outer diameter surface of the inner ring 112 in a rolling bearing as shown in Patent Document 1 that does not require dedicated groove processing (see FIG. 6). The U-shaped groove 123 slidably in contact with the directional end, and the U-shaped groove 124 for fixing the outer peripheral portion of the seal member 117 to the axial end of the inner diameter surface of the outer ring 114 in a fitted state. Is U-shaped. That is, the inner and outer rings 12 and 14 in the embodiment shown in FIG. 1 have the same shape as the inner and outer rings 112 and 114 in a conventional rolling bearing that does not require dedicated groove processing.

  As described above, the labyrinths 22 and 23 are formed by the flange portions 20 and 21 of the cage 16 and the U-shaped grooves 24 and 25 of the inner and outer rings 12 and 14, so that the lubricating oil excessively flows into the bearing. This is surely suppressed. Further, since the cage 16 has an axially symmetrical shape in which the flange portions 20 and 21 are provided at the axial ends of the pair of annular bodies 17, when the centrifugal force is applied under high-speed rotation, the pair of annular bodies 17 The bodies 17 can suppress the deformation of the cage 16 by suppressing the deformation thereof. As a result, the rolling element 15 can be prevented from falling off the pocket 19 and interfering with other parts such as the inner and outer rings 12 and 14.

  On the other hand, as shown in FIGS. 2 to 5, the retainer 16 is provided with slits 26 and 27 cut in the radial direction at the flange portions 20 and 21 located on the inner diameter side and the outer diameter side of the annular body 17. The structure is provided. The slits 26 and 27 are formed at a plurality of locations along the circumferential direction of the flange portions 20 and 21, and are formed at equal intervals along the circumferential direction of the flange portions 20 and 21. In this way, by forming the slits 26 and 27 in the flange portions 20 and 21, this implementation is more effective than the slit-free flange portions 220 and 221 (see FIG. 7) in the rolling bearing as disclosed in Patent Document 2. The rigidity of the collar parts 20 and 21 in a form can be reduced.

  In addition, the slits 26 and 27 are formed in the site | part corresponding to the axial direction thickness part in which the opposing surface 18 was formed between the pockets 19 of the annular body 17 was formed. Thus, the strength of the cage is reduced by the formation of the slit by forming it in the portion corresponding to the axially thick portion where the opposed surface 18 is formed between the pockets 19 of the annular body 17. This can be avoided and deformation of the cage can be prevented.

Here, as described above, the U-shaped grooves 24 and 25 of the inner and outer rings 12 and 14 in the embodiment shown in FIG. 1 are rolling bearings as in Patent Document 1 that do not require dedicated groove processing (see FIG. 6). Since this corresponds to the U-shaped grooves 123 and 124 of the inner and outer rings 112 and 114, the dimensional relationship between the inner and outer rings 12 and 14 and the cage 16 in this embodiment is as follows. That is, as shown in FIG. 1, the inner diameter D ₁ of the flange portion 20 located on the inner diameter side of the retainer 16 is smaller than the outer diameter D _{2 of the} outer portion in the axial direction of the U-shaped groove 24 of the inner ring 12 and is retained. The outer diameter D ₃ of the flange portion 21 located on the outer diameter side of the vessel 16 is larger than the inner diameter D _{4 of the} outer portion in the axial direction of the U-shaped groove 25 of the outer ring 14.

  When the cage 16 is incorporated into the rolling bearing, the inner ring 12 and the outer ring 14 and the cage 16 are in the dimensional relationship as described above when the pair of annular bodies 17 are joined close to each other in the axial direction. The flanges 20 and 21 interfere with the axially outer portion of the U-shaped groove 24 of the inner ring 12 and the axially outer portion of the U-shaped groove 25 of the outer ring 14. Even if there is such interference, the flanges 20 and 21 themselves have low rigidity due to the slits 26 and 27 provided in the flanges 20 and 21 of the retainer 16, so that the flanges 20 and 21 are easily elastically deformed. To do. By the elastic deformation of the flange portions 20 and 21, the flange portions 20 and 21 can be easily accommodated in the U-shaped grooves 24 and 25 of the inner ring 12 and the outer ring 14. In addition, by forming the plurality of slits 26 and 27 at equal intervals along the circumferential direction, the rigidity of the flange portions 20 and 21 can be easily reduced, and the flange portions 20 and 21 are extended over the entire circumference. It can be deformed evenly and the assembling property of the cage 16 is improved.

  As described above, by forming the slits 26 and 27 in the flange portions 20 and 21 of the cage 16, the inner and outer rings 212 and 214 having the L-shaped grooves 224 and 225 formed by dedicated groove processing (see FIG. 7). ) And the retainer 16 having the flange portions 20 and 21 on the inner and outer rings 112 and 114 (see FIG. 6) having the general U-shaped grooves 123 and 124 that do not require special groove processing. It becomes easy to assemble. As a result, as a high rotation bearing used in an electric vehicle or a hybrid vehicle, the cage 16 having the flanges 20 and 21 is provided on the inner and outer rings 12 and 14 (see FIG. 1) corresponding to the inner and outer rings 112 and 114 described above. The built-in rolling bearing can be used. Further, in a rolling bearing as a high rotation bearing, labyrinths 22 and 23 (see FIG. 1) constituted by U-shaped grooves 24 and 25 from labyrinths 222 and 223 (see FIG. 6) constituted by L-shaped grooves 224 and 225 (see FIG. 1). By changing to, the lubricant flowing into the bearing can be further restricted, and further reduction in torque becomes easy to realize.

  The pair of annular bodies 17 described above are made of synthetic resin in that the weight of the cage 16 can be reduced. Here, in view of cost and oil resistance, it is effective to mold with any one synthetic resin selected from PPS (polyphenylene sulfide), PA66 (polyamide 66) or PA46 (polyamide 46). .

  For example, when a lot of resin-aggressive components (phosphorus, sulfur) are contained in the oil used, it is preferable to use PPS because the superiority and inferiority of oil resistance is PPS> PA46> PA66. Further, considering the price of the resin material, since PA66> PA46> PPS, it is desirable to select the material in consideration of the resin aggressiveness of the oil used. As other resin materials, PA9T (polyamide 9T), PEEK (polyetheretherketone) or phenol resin can be used.

  In the embodiment described above, the case where the flange portions 20 and 21 are provided on both the inner diameter side and the outer diameter side of the axial end portion of the cage 16 is illustrated, but the present invention is not limited to this. Although not shown, the flange portions 20 and 21 are provided only on either the inner diameter side or the outer diameter side of the axial end of the cage 16, and the slits 26 and 27 are provided on the flange portions 20 and 21. Also good.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. It includes the equivalent meanings recited in the claims and the equivalents recited in the claims, and all modifications within the scope.

12 Inner ring 14 Outer ring 15 Rolling body 16 Cage 17 Annular body 18 Opposing surface 19 Pocket 20, 21 Gutter 24, 25 U-shaped groove 26, 27 Slit

Claims (5)

An inner ring and an outer ring that rotate relative to each other, a plurality of rolling elements interposed between the inner ring and the outer ring, and the inner ring and the outer ring, the rolling elements are held at equal intervals in the circumferential direction. A rolling bearing comprising an annular U-shaped groove having a U-shaped cross section at the axial end of the inner ring or outer ring,
At least one of the inner diameter side and the outer diameter side of the axial end of the cage is provided with a flange portion that extends in the radial direction and is accommodated in the U-shaped groove of the inner ring or outer ring, and is cut in the radial direction. A rolling bearing characterized in that a slit is formed in the flange.   The rolling bearing according to claim 1, wherein the slit is provided at a plurality of locations along a circumferential direction of the flange portion.   The rolling bearing according to claim 2, wherein the slits are provided at equal intervals along a circumferential direction of the flange portion.   The cage is formed with hemispherical pockets for accommodating rolling elements at a plurality of locations in the circumferential direction on opposing surfaces of a pair of annular members facing in the axial direction, and the opposing surfaces are abutted to join the pair of annular members. The rolling bearing according to any one of claims 1 to 3.   The rolling bearing according to any one of claims 1 to 4, wherein the cage is made of a synthetic resin.

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