Rolling bearings and cages

Abstract

The present invention provides a rolling bearing and a retainer. The rolling bearing (10) includes: an inner ring (11); an outer ring (12); a plurality of rolling elements; and a retainer (14). The retainer (14) includes: an annular body (31) positioned closer to a first side in an axial direction than the rolling elements; and a plurality of retainer claws (32) arranged to extend from the annular body (31) to a second side in an axial direction. The retainer claws (32) include a missing portion (37) arranged from the first side to the second side in the axial direction, so that the missing portion (37) is open to the second side in the axial direction and in the radial direction. The retainer claws (32) include a pair of retainer claw bodies (38), so that the retainer claw bodies (38) are arranged on both sides of the missing portion (37) in the circumferential direction and contact a corresponding rolling element, and a reinforcing rib (40) is provided between the retainer claw bodies (38).

Description

Technical Field

[0001] The invention relates to a rolling bearing and a retaining frame. Background Art

[0002] A rolling bearing includes an inner ring, an outer ring, a plurality of rolling elements disposed between the inner and outer rings, and an annular retainer. In the case of a ball bearing whose rolling elements are balls, a so-called snap-on retainer made of resin is used. Rolling bearings using a snap-on retainer have the following advantages: an area where lubricant such as grease is not agitated (a non-agitated area) is large, and shearing of the grease is suppressed. Japanese Unexamined Patent Application Publication No. 2003-35317 (JP2003-35317A) describes a rolling bearing including a snap-on retainer.

[0003] A snap-on retainer comprises an annular body positioned closer to a first side in the axial direction than the rolling elements, and a plurality of retainer claws. The retainer claws are arranged to extend from the annular body to a second side in the axial direction. Consequently, when the rolling bearing rotates, the distal ends of the retainer claws deform toward the outer ring due to centrifugal force. In particular, at high rotational speeds, there is a risk that the retainer claws may partially contact the outer ring, causing uneven retainer wear. Summary of the Invention

[0004] In view of the above, an object of the present disclosure is to realize a cage whose cage claws are less likely to be deformed by centrifugal force and whose strength is prevented from being reduced.

[0005] A rolling bearing according to a first aspect of the present disclosure includes: an inner ring; an outer ring; a plurality of rolling elements; and an annular retainer. The plurality of rolling elements are arranged between the inner ring and the outer ring. In the annular retainer, the plurality of rolling elements are held at intervals in the circumferential direction of the retainer. The retainer includes an annular body and a plurality of retainer claws, the annular body being positioned closer to a first side of the retainer in the axial direction than the plurality of rolling elements are to the first side of the retainer in the axial direction, and the plurality of retainer claws being arranged to extend from the annular body to a second side in the axial direction. Each of the plurality of retainer claws includes a missing portion provided from the first side of each of the plurality of retainer claws in the axial direction to the second side of each of the plurality of retainer claws in the axial direction, such that the missing portion is open to the second side in the axial direction and open in the radial direction of the retainer. Each of the plurality of retainer claws includes a pair of retainer claw bodies, the retainer claw bodies being disposed on both sides of the missing portion in the circumferential direction and being in contact with a corresponding one of the plurality of rolling elements. A reinforcement rib is provided between the pair of retainer claw bodies.

[0006] In this rolling bearing, the missing portion is formed in the retainer claws, reducing their weight and, consequently, the centrifugal force applied to the retainer. During rotation of the rolling bearing, the rolling elements contact the retainer claws circumferentially. While the missing portion reduces the retainer claws' strength, the reinforcing ribs prevent this reduction. Thus, by reducing the retainer claws' weight, they are less likely to deform due to centrifugal force, while the reinforcing ribs prevent any reduction in their strength.

[0007] Furthermore, in the above aspect, the inner ring may include an inner ring raceway with the balls serving as the plurality of rolling elements rolling against the inner ring raceway, and the cage may include a guide portion configured to position the cage by contacting the inner ring raceway. In this configuration, since the balls roll against the inner ring raceway, machining, such as grinding, can be performed on the inner ring raceway. When the guide portion contacts the inner ring raceway in this configuration, the cage is stably guided.

[0008] Furthermore, in the above aspect, the reinforcement rib can be provided between the pair of retainer claw bodies at a position closer to the radially inner side. In this configuration, the volume of the missing portion can be increased compared to a case where the reinforcement rib is provided closer to the radially outer side. This further enhances the effect of reducing the weight of the retainer claws.

[0009] Furthermore, in the above aspect, the reinforcing rib may include: a first rib portion, the first rib portion being disposed on the first side in the axial direction and connecting the annular body to the pair of retainer claw bodies; and a pair of second rib portions, the pair of second rib portions being spaced apart in the circumferential direction so as to extend from the first rib portion toward the second side in the axial direction, the second rib portions being connected to the pair of retainer claw bodies. In this configuration, a portion of the reinforcing rib is missing between the second rib portions, thereby limiting the increase in weight caused by the reinforcing rib. Furthermore, the pair of retainer claw bodies are connected to the annular body via the first and second rib portions, so that the reinforcing rib can fully function as a reinforcement for the pair of retainer claw bodies.

[0010] Furthermore, a retainer according to a second aspect of the present disclosure includes an annular body and a plurality of retainer claws. The annular body is positioned closer to a first side of the retainer in the axial direction than a plurality of rolling elements disposed in a rolling bearing are to the first side of the retainer in the axial direction. The plurality of retainer claws are disposed so as to extend from the annular body toward a second side in the axial direction. Each of the plurality of retainer claws includes a missing portion extending from the first side in the axial direction to the second side in the axial direction, such that the missing portion is open toward the second side in the axial direction and along the radial direction of the retainer. Each of the plurality of retainer claws includes a pair of retainer claw bodies, such that the pair of retainer claw bodies are disposed on either side of the missing portion in the circumferential direction of the retainer and such that the pair of retainer claw bodies contact a corresponding one of the plurality of rolling elements. A reinforcing rib is disposed between the pair of retainer claw bodies.

[0011] In this cage, a missing portion is formed in the cage claws. This reduces the weight of the cage claws, thereby reducing the centrifugal force applied to the cage. When the rolling bearing including this cage rotates, the rolling elements contact the cage claws circumferentially. Although the missing portion reduces the strength of the cage claws, the reinforcing ribs prevent this reduction in strength. Thus, by reducing the weight of the cage, the cage claws are less likely to deform due to centrifugal force, and the reinforcing ribs can prevent the reduction in strength of the cage claws.

[0012] Through various aspects of the present disclosure, the retainer claws of the retainer may be difficult to deform, and a reduction in strength of the retainer claws may be prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Features, advantages, and technical and industrial significance of illustrative embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals represent like elements, and in which:

[0014] Figure 1 is a cross-sectional view of a rolling bearing;

[0015] Figure 2 is a perspective view of the cage;

[0016] Figure 3 is a cross-sectional view showing the cage and its surrounding area;

[0017] Figure 4 is an enlarged view of a portion of the cage as viewed from the outside in the radial direction;

[0018] Figure 5 is an enlarged view of a portion of the cage as viewed from a second side in the axial direction; and

[0019] Figure 6 It is along Figure 4 A cross-sectional view taken along arrow VI in FIG. DETAILED DESCRIPTION

[0020] Figure 1 It is a cross-sectional view of a rolling bearing. Figure 1 The rolling bearing 10 shown in FIG. 1 includes an inner ring 11, an outer ring 12, a plurality of rolling elements disposed between the inner ring 11 and the outer ring 12, and an annular cage 14. The plurality of rolling elements in the present disclosure are balls 13, and the rolling bearing 10 is a ball bearing (deep groove ball bearing). Figure 1 A cross section including the center line C of the rolling bearing 10 (also referred to as “bearing center line C”) is shown.

[0021] In the present disclosure, the direction along the center line C of the rolling bearing 10 corresponds to the axial direction of the rolling bearing 10 and is simply referred to as the “axial direction.” The axial direction also includes a direction parallel to the center line C. Figure 1 The right side in is defined as the first side in the axial direction, Figure 1 The left side in the figure is defined as the second side in the axial direction. The direction perpendicular to the bearing centerline C corresponds to the radial direction of the rolling bearing 10 and is simply referred to as the "radial direction." The direction in which the rolling bearing (inner ring 11 in the present disclosure) rotates about the bearing centerline C corresponds to the circumferential direction of the rolling bearing 10 and is simply referred to as the "circumferential direction."

[0022] Figure 1The rolling bearing 10 shown in FIG. 1 further includes seals 15 on both sides in the axial direction. Seals 15 prevent lubricant, such as grease, in annular space 16 (also referred to as "bearing interior") formed between inner ring 11 and outer ring 12 from leaking to the outside (bearing exterior). Seals 15 also function to prevent foreign matter from entering the bearing interior.

[0023] The inner ring 11 is an annular member, and an inner ring raceway 21 with which the balls 13 roll in contact is formed within the outer periphery of the inner ring 11. Figure 1 In the cross section shown in , inner ring raceway 21 is composed of grooves formed in a concave arcuate shape with a radius slightly larger than that of ball 13. Respective recessed grooves 23 are formed on the respective outer peripheral surfaces of both axially oriented side portions of inner ring 11. Recessed grooves 23 face the respective inner peripheral portions of seal 15 via corresponding gaps. A labyrinth gap is formed by the plurality of gaps.

[0024] The outer ring 12 is an annular member, and the outer ring raceway 22 with which the balls 13 roll in contact is formed on the inner periphery of the outer ring 12. Figure 1 In the cross section shown in , the outer ring raceway 22 is composed of a groove formed in a concave arc shape having a radius slightly larger than that of the ball 13. Corresponding seal grooves 24 are formed on the respective inner peripheral surfaces of both side portions in the axial direction of the outer ring 12. The respective outer peripheral portions of the seal 15 are attached to the seal grooves 24.

[0025] The balls 13 are disposed between the inner ring raceway 21 and the outer ring raceway 22. When the rolling bearing 10 (the inner ring 11) rotates, the balls 13 roll on the inner ring raceway 21 and the outer ring raceway 22.

[0026] Figure 2 is a perspective view of the cage 14 . Figure 3 is a cross-sectional view showing the retainer 14 and its surrounding area. The retainer 14 includes an annular body (annular portion) 31 and a plurality of retainer claws (support portions) 32. The retainer 14 in the present disclosure further includes a guide portion 33. The annular body 31 is a portion having an annular shape, and the annular body 31 is positioned closer to the first side in the axial direction than the balls 13. All retainer claws 32 have the same shape. The retainer claws 32 are arranged to extend from the annular body 31 to the second side in the axial direction. The guide portion 33 is arranged inward from the retainer claws 32 in the radial direction. A gap 17 in the radial direction is provided between the retainer claws 32 and the guide portion 33. A space is provided between the retainer claws 32, which are arranged in pairs so as to be adjacent to each other in the circumferential direction. This space is formed on the second side of the annular body 31 in the axial direction and serves as a pocket 30 in which the balls 13 are stored. A plurality of pockets 30 are formed along the circumferential direction.

[0027] Thus, the balls 13 are retained at intervals in the circumferential direction of the retainer 14. A portion of the retainer claw 32 (retainer claw body 38 (described below)) serves as a first portion of the pocket 30, which has a surface 28 facing the circumferential direction. The balls 13 can contact the surface 28. A portion of the annular body 31 serves as a second portion of the pocket 30, which has a surface 29 facing the second side in the axial direction. The balls 13 contact the surface 29. For example, the retainer 14 is made of a resin (synthetic resin) such as polyamide and is manufactured by injection molding. The annular body 31, the retainer claw 32, and the guide portion 33 are integrally molded, and the retainer 14 is composed of a single component.

[0028] The guide portion 33 is further described below. The guide portion 33 is provided so as to extend from the radially inner portion 34 (see FIG. Figure 3 ) extends toward the second side in the axial direction. The guide portion 33 includes a guide body 61 connected to the annular body 31 and a protrusion 35 provided radially inward of the second side portion of the guide body 61 in the axial direction. The protrusion 35 protrudes toward the inner ring 11. A portion of the protrusion 35 can contact the inner ring raceway 21.

[0029] In a state where the center line of the retainer 14 coincides with the center line C of the bearing (in Figure 3 In the state of , a gap is formed between the protrusion 35 and the inner ring raceway 21. When the retainer 14 is displaced in the radial direction from this state, the protrusion 35 radially contacts the inner ring raceway 21. As a result, the displacement of the retainer 14 in the radial direction is restricted. Figure 3 When the retainer 14 is displaced to the first side in the axial direction, the protrusion 35 contacts the inner ring raceway 21 from the axial direction. As a result, the retainer 14 is restricted from being displaced to the first side in the axial direction. It should be noted that when the retainer 14 is displaced from Figure 3 When the retainer 14 is displaced to the second side in the axial direction, the surface 29 of the annular body 31 contacts the balls 13. Thus, the retainer 14 is restricted from being displaced to the second side in the axial direction.

[0030] Thus, the guide portion 33 functions to restrict the radial and axial movement of the retainer 14. Specifically, the guide portion 33 positions the retainer 14 by contacting the inner ring raceway 21. When the guide portion 33 contacts (slides in) the inner ring raceway 21, the rotation of the retainer 14 is guided. In other words, the retainer 14 in this disclosure functions as a raceway-guided retainer (an inner ring raceway-guided retainer).

[0031] Figure 4 This is an enlarged view of a portion of the cage 14 as viewed from the outside in the radial direction. Figure 5This is an enlarged view of a portion of the retainer 14 as viewed from the second side in the axial direction. The retainer claw 32 includes a missing portion 37. The missing portion 37 is provided from the first side in the axial direction of the retainer claw 32 to the second side in the axial direction of the retainer claw 32, so that the missing portion 37 is open toward the second side in the axial direction and in the radial direction. In the invention disclosed herein, the reinforcing rib 40 is provided at a position closer to the inner side of the retainer claw 32 in the radial direction (see FIG. 1 ). Figure 6 ), therefore, the missing portion 37 is open to the second side in the axial direction and is open to the outside in the radial direction, as described below. Figure 6 It is along Figure 4 A cross-sectional view taken along arrow VI in FIG.

[0032] Since the missing portion 37 is provided, the retainer claw 32 includes a pair of retainer claw bodies (pillar bodies) 38 such that the pair of retainer claw bodies 38 are provided on both sides of the missing portion 37 in the circumferential direction (see FIG. Figure 4 Each of the pair of retainer claw bodies 38 forms a first portion 30a of the pocket 30, which contacts the ball 13. It should be noted that the remaining second portion 30b of the pocket 30 is formed by the annular body 31. A reinforcing rib 40 is provided between the pair of retainer claw bodies 38. The reinforcing rib 40 is provided in a portion of the missing portion 37. The reinforcing rib 40 has a plate shape, and its radial dimension is smaller than that of the retainer claw body 38.

[0033] exist Figure 4 In the embodiment, the reinforcing ribs 40 include a first rib 41 and a pair of second ribs 42. The first rib 41 is provided on the first side in the axial direction of the missing portion 37 and connects the annular body 31 to the corresponding portions 39a on the first side in the axial direction of the pair of retainer pawl bodies 38. The second ribs 42 are provided at intervals in the circumferential direction. The second ribs 42 are portions extending from the first rib 41 to the second side in the axial direction and are connected to the corresponding portions 39b on the second side in the axial direction of the pair of retainer pawl bodies 38.

[0034] As described above, the second ribs 42 are arranged at intervals in the circumferential direction. Therefore, a portion between the second ribs 42 is missing. The missing portion is referred to as a "notch portion 43". Figure 4 As shown in FIG, when the reinforcement rib 40 is viewed from the outside in the radial direction, the notch portion 43 has a concave shape that does not have a corner. Therefore, the notch portion 43 makes it difficult to cause stress concentration on the reinforcement rib 40.

[0035] The reinforcing rib 40 is provided between the pair of retainer claw bodies 38 at a position closer to the inner side in the radial direction (see Figure 6The reinforcing rib 40 is provided radially inward from the center S in the radial direction of the retainer claw body 38. The side surface 40a on the second side in the axial direction of the reinforcing rib 40 is located closer to the annular body 31 than the side surface 38a on the second side in the axial direction of the retainer claw body 38. Figure 4 As shown in FIG, at least a portion of the reinforcing rib 40 (the second rib 42 ) is provided in a portion of a region across the retainer pawl body 38 opposite to a region J where the balls 13 contact the retainer pawl body 38 .

[0036] Now, focus on Figure 2 The plurality of retainer claws 32 are arranged on both sides of a pocket 30 in the circumferential direction, extending across a pocket 30 in which a ball 13 is stored. One of the plurality of retainer claws 32 is referred to as a first retainer claw 32-1, and the other retainer claw 32 is referred to as a second retainer claw 32-2. The retainer claws 32 are arranged in pairs such that a distance Q between the respective distal ends of the circumferentially adjacent retainer claws 32-1 and 32-2 on the second side in the axial direction is greater than the diameter of the ball 13.

[0037] The first retainer claw 32-1 includes a pair of retainer claw bodies 38 and is Figure 2 The retainer claw body 38 on the second retainer claw 32-2 side among the plurality of retainer claw bodies 38 is assigned a reference numeral "38-1". The second retainer claw 32-2 also includes a pair of retainer claw bodies 38, and Figure 2 The retainer pawl body 38 on the first retainer pawl 32-1 side among the plurality of retainer pawl bodies 38 is assigned reference numeral 38-2. A distance Q between a distal end on the second side in the axial direction of the first retainer pawl body 38-1 and a distal end on the second side in the axial direction of the second retainer pawl body 38-2 is greater than the diameter of the ball 13, wherein the distance Q spans one pocket 30 in which the ball 13 is stored.

[0038] In the above configuration, when retainer 14 is displaced to the first side in the axial direction, its displacement is not restricted by balls 13. Therefore, guide portion 33 of retainer 14 can axially contact inner ring raceway 21, as described above. Consequently, retainer 14 does not fall out from between inner ring 11 and outer ring.

[0039] It should be noted that in the case of ordinary deep groove ball bearings, a so-called snap-on retainer can be used. A snap-on retainer includes a pawl portion on the distal side of the retainer pawl, and is arranged in pairs so that the distance between the pawl portions of the retainer pawls adjacent to each other in the circumferential direction is less than the diameter of the ball. In this configuration, the axial movement of the snap-on retainer is restricted by the balls, so that the retainer does not fall out from between the inner and outer rings. Unlike this snap-on retainer, the retainer 14 of the present disclosure is not provided with pawl portions whose distance between them is less than the ball diameter, as is provided in ordinary snap-on retainers. Since no pawl portions are provided, the retainer 14 of the present disclosure is reduced in weight.

[0040] As described above, the retainer 14 provided in the rolling bearing 10 of the present disclosure includes an annular body 31 positioned closer to a first side in the axial direction than the balls 13, and retainer claws 32 extending from the annular body 31 to a second side in the axial direction. Each of the retainer claws 32 includes a missing portion 37. The missing portion 37 extends from the first side in the axial direction to the second side in the axial direction, opening toward the second side in the axial direction and in the radial direction. Due to the provision of the missing portion 37, each of the retainer claws 32 includes a pair of retainer claw bodies 38, disposed on either side of the missing portion 37 in the axial direction. Reinforcing ribs 40 are provided between the retainer claw bodies 38.

[0041] In the rolling bearing 10 (cage 14), the missing portion 37 formed in the retainer claw 32 reduces the weight of the retainer claw 32, thereby reducing the centrifugal force applied to the retainer 14. Each of the pair of retainer claw bodies 38 constitutes the first portion of the retainer 30, which contacts the balls 13. Therefore, when the rolling bearing 10 rotates, the balls 13 contact the retainer claw 32 (retainer claw body 38) circumferentially due to motion delays, etc. The missing portion 37 reduces the strength of the retainer claw 32, but the reinforcing rib 40 prevents this reduction in strength. Specifically, the reinforcing rib 40 increases the circumferential rigidity of the retainer claw 32 provided with the missing portion 37. Therefore, by reducing the weight of the retainer claw 32, deformation due to centrifugal force is less likely to occur, and the reinforcing rib 40 prevents any reduction in strength of the retainer claw 32.

[0042] In the rolling bearing 10 of the present disclosure, the cage 14 includes a guide portion 33. The guide portion 33 positions the cage 14 so that the protrusion 35 provided in the guide portion 33 contacts the inner ring raceway 21. Specifically, the guide portion 33 restricts radial and axial movement of the cage 14 and guides its rotation. Since the balls 13 roll in contact with the inner ring raceway 21, machining such as grinding can be performed on the inner ring raceway 21. With the guide portion 33 in contact with the inner ring raceway 21 in this configuration, the cage 14 is stably guided.

[0043] Because the rotation of cage 14 is guided by inner ring 11, cage 14 is positioned closer to inner ring 11. This allows the radius of cage 14 to be reduced. Due to a reduction in any of the mass of cage 14, the angular velocity of cage 14, or the distance (radius) of cage 14 from the center of rotation, centrifugal force is reduced. Therefore, in the cage 14 of the present disclosure, since cage 14 is positioned closer to inner ring 11, the centrifugal force exerted on cage 14 can be further reduced.

[0044] Because retainer 14 is an inner ring guided retainer, the gap between pockets 30 and balls 13 can be set wider than in a rolling element guided retainer guided by balls (not shown). Consequently, even if retainer claws 32 of retainer 14 elastically deform due to centrifugal force, balls 13 partially contact pockets 30, thereby preventing uneven wear of retainer 14.

[0045] like Figure 6 As shown in FIG, the reinforcing rib 40 is provided between the pair of retainer claw bodies 38 at a position closer to the inner side in the radial direction. Therefore, the volume of the missing portion 37 can be made larger than in a case where the reinforcing rib 40 is provided at a position closer to the outer side in the radial direction. This is because the circumferential length between the pair of retainer claw bodies 38 in one retainer claw 32 (see FIG. Figure 5 ) is smaller on the side closer to the radial inside and larger on the side closer to the radial outside. This enhances the effect of reducing the weight of the retainer claws 32. Furthermore, since the reinforcing ribs 40 are positioned closer to the radial inside, the distance (radius) from the center of rotation of the reinforcing ribs 40 is smaller than in a case where the reinforcing ribs 40 are positioned closer to the radial outside. Consequently, the centrifugal force applied to the reinforcing ribs 40 is reduced.

[0046] like Figure 4As shown in FIG, the reinforcing rib 40 includes a first rib 41 and a second rib 42. The first rib 41 is provided on a first side in the axial direction. The first rib 41 connects the annular body 31 to the pair of retainer claw bodies 38. The second ribs 42 are provided at intervals in the circumferential direction so as to extend from the first rib 41 to a second side in the axial direction and connect to the pair of retainer claw bodies 38.

[0047] The reinforcement ribs 40 are configured so that a portion between the second ribs 42 is missing, thus limiting the weight increase caused by the reinforcement ribs 40. Furthermore, the pair of retainer claw bodies 38 are connected to the annular body 31 via the first ribs 41 and the second ribs 42. Therefore, the reinforcement ribs 40 can sufficiently function as reinforcements for the pair of retainer claw bodies 38. Furthermore, the notches 43 are formed on the second side of the reinforcement ribs 40 in the axial direction. Consequently, the retainer claws 32 are particularly lightweight on the second side in the axial direction, making it less likely that the retainer claws 32 will deform toward the outer ring 12 due to centrifugal force.

[0048] Thus, the rolling bearing 10 of the present disclosure can reduce the centrifugal force applied to the retainer 14. Consequently, the retainer 14 is less likely to elastically deform toward the outer ring 12 due to the centrifugal force. This prevents a portion of the retainer 14 from partially contacting the outer ring 12 and unevenly wearing the retainer 14. Consequently, a longer operating life of the rolling bearing 10 can be achieved. In particular, the rolling bearing 10 (retainer 14) of the present disclosure is suitable for high-speed rotation.

[0049] The embodiments described herein are intended in all respects to be illustrative and non-restrictive. The scope of the present disclosure is not limited to the above-described embodiments and encompasses all modifications that are equivalent to the configurations described within the scope of the claims. The above-described embodiments address the case where the rolling bearing is a deep groove ball bearing, but the rolling bearing may be an angular contact ball bearing.

Claims

1. A rolling bearing (10), characterized in that include: Inner ring (11); Outer ring (12); a plurality of rolling elements disposed between the inner ring (11) and the outer ring (12); and An annular retainer (14) in which the plurality of rolling elements are retained at intervals in a circumferential direction of the retainer (14), wherein: The retainer (14) includes an annular body (31) and a plurality of retainer claws (32), wherein the annular body (31) is positioned closer to a first side of the retainer (14) in the axial direction than the plurality of rolling elements are to the first side of the retainer (14) in the axial direction, and the plurality of retainer claws (32) are arranged to extend from the annular body (31) toward a second side in the axial direction; Each of the plurality of retainer claws (32) includes a missing portion (37) provided from a first side of each of the plurality of retainer claws (32) in the axial direction to a second side of each of the plurality of retainer claws (32) in the axial direction, such that the missing portion (37) is open to the second side in the axial direction and is open in a radial direction of the retainer (14); Each of the plurality of retainer claws (32) includes a pair of retainer claw bodies (38), such that the pair of retainer claw bodies (38) are provided on both sides of the missing portion (37) in the circumferential direction, and such that the pair of retainer claw bodies (38) are in contact with a corresponding one of the plurality of rolling elements; A reinforcing rib (40) is provided between the pair of retainer claw bodies (38); The reinforcing rib (40) includes: a first rib portion (41) which is provided on the first side in the axial direction and connects the annular body (31) to the pair of retainer claw bodies (38); and a pair of second rib portions (42) which are provided at intervals in the circumferential direction in a manner extending from the first rib portion (41) toward the second side in the axial direction and are connected to the pair of retainer claw bodies (38); and A portion between the second ribs includes a notch portion having a concave shape without a corner.

2. The rolling bearing (10) according to claim 1, characterized in that: The inner ring (11) includes an inner ring raceway (21), and the balls (13) as the plurality of rolling elements are in rolling contact with the inner ring raceway (21); and The cage (14) includes a plurality of guide portions (33) configured to position the cage (14) by contacting the inner ring raceway (21).

3. The rolling bearing (10) according to claim 1 or 2, characterized in that The reinforcing rib (40) is provided between the pair of retainer pawl bodies (38) at a position closer to the inner side in the radial direction.

4. A retainer (14), characterized in that include: an annular body (31) disposed closer to a first side of the cage (14) in the axial direction than a plurality of rolling elements disposed in the rolling bearing (10) are to the first side of the cage (14) in the axial direction; and A plurality of retainer claws (32) are provided to extend from the annular body (31) toward the second side in the axial direction, wherein: Each of the plurality of retainer claws (32) includes a missing portion (37) provided from a first side of each of the plurality of retainer claws (32) in the axial direction to a second side of each of the plurality of retainer claws (32) in the axial direction, such that the missing portion (37) is open to the second side in the axial direction and is open in a radial direction of the retainer (14); Each of the plurality of retainer claws (32) includes a pair of retainer claw bodies (38), such that the pair of retainer claw bodies (38) are provided on both sides of the missing portion (37) in the circumferential direction of the retainer (14), and such that the pair of retainer claw bodies (38) are in contact with a corresponding one of the plurality of rolling elements; and A reinforcing rib (40) is provided between the pair of retainer claw bodies (38); The reinforcing rib (40) includes: a first rib portion (41) which is provided on the first side in the axial direction and connects the annular body (31) to the pair of retainer claw bodies (38); and a pair of second rib portions (42) which are provided at intervals in the circumferential direction in a manner extending from the first rib portion (41) toward the second side in the axial direction and are connected to the pair of retainer claw bodies (38); and A portion between the second ribs includes a notch portion having a concave shape without a corner.

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