Retainer

Abstract

To provide a retainer capable of stably locking an annular body.SOLUTION: A retainer includes a first annular body 51 and a second annular body 52. The first annular body 51 includes a first body 53, and a first claw 54 protruding from the first body 53. The second annular body 52 includes a second body 56, and a second claw 57 protruding from the second body 56. The first claw 54 includes a first extended portion 541, and a first return portion 542 protruding from the first extended portion 541 to one side in a circumferential direction. The second claw 57 includes a second extended portion 571, and a second return portion 572 protruding from the second extended portion 571 to the other side in the circumferential direction. The second extended portion 571 is positioned on one side in the circumferential direction with respect to the first extended portion 541. The second return portion 572 is positioned on a side opposite from the second body 56 with respect to the first return portion 542 and faces the first return portion 542 in an axial direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a cage. [Background technology]

[0002] Patent Document 1 describes a cage made up of a pair of annular bodies, in which locking portions located on the radially outer side are disposed in locking grooves located on the radially inner side, thereby locking the pair of annular bodies to each other. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-067367 Summary of the Invention [Problem to be solved by the invention]

[0004] The cage described in Patent Document 1 can be made smaller than, for example, a crown-shaped cage. However, for example, the centrifugal force generated by the rotation of the cage can cause the locking portion to separate from the locking groove, which can cause the locking of the annular body to become unstable.

[0005] An object of the present invention is to provide a cage that can stably lock an annular body. [Means for solving the problem]

[0006] The cage of the present invention is [1] "a cage comprising a first annular body and a second annular body aligned with the first annular body in the axial direction, wherein the first annular body has a first main body portion having an annular shape and a first claw portion protruding from the first main body portion toward the second annular body, and the second annular body has a second main body portion having an annular shape and a second claw portion protruding from the second main body portion toward the first annular body, wherein the first claw portion includes a first extending portion extending along the axial direction and a first return portion protruding from the first extending portion to one side in the circumferential direction, and the second claw portion includes a second extending portion extending along the axial direction and a second return portion protruding from the second extending portion to the other side in the circumferential direction, wherein the second extending portion is located on one side in the circumferential direction of the first extending portion, and the second return portion is located on the opposite side of the second body portion with respect to the first return portion and faces the first return portion in the axial direction."

[0007] In the cage described in [1] above, the second turned-up portion is located on the opposite side of the first turned-up portion from the second main body portion and faces the first turned-up portion in the axial direction. This allows the first annular body and the second annular body to be axially engaged with each other. Furthermore, the second extending portion is located on one circumferential side of the first extending portion, the first turned-up portion protruding from the first extending portion to one circumferential side, and the second turned-up portion protruding from the second extending portion to the other circumferential side. This ensures stable engagement between the first turned-up portion and the second turned-up portion, even if the first turned-up portion and the second turned-up portion are displaced radially due to centrifugal force generated by rotation of the cage. Therefore, this cage allows stable engagement between the first annular body and the second annular body.

[0008] The cage of the present invention may be [2] "the cage according to [1] above, wherein the first claw portion includes a first tip portion located on the opposite side from the first body portion, the second claw portion includes a second tip portion located on the opposite side from the second body portion, a first hole is formed in a surface of the first body portion facing the second annular body, a second hole is formed in a surface of the second body portion facing the first annular body, the first tip portion is disposed in the second hole, and the second tip portion is disposed in the first hole." This restricts movement of the first claw portion and the second claw portion in the radial direction.

[0009] The cage of the present invention may be [3] "the cage according to the above [2], wherein the width of the first hole in the circumferential direction is larger than the width of the first hole in the radial direction, and the width of the second hole in the circumferential direction is larger than the width of the second hole in the radial direction." This allows the first tip portions of the first claw portions to be positioned in the second holes while deforming the first claw portions in the circumferential direction, and the second tip portions of the second claw portions to be positioned in the first holes while deforming the second claw portions in the circumferential direction.

[0010] The cage of the present invention may be [4] "the cage according to any one of the above [1] to [3], wherein the first annular body further has a first retaining portion located on the other circumferential side of the first claw portion, the second annular body further has a second retaining portion located on one circumferential side of the second claw portion, the first retaining portion including a first retaining surface that retains the rolling elements, and the second retaining portion including a second retaining surface that retains the rolling elements." This improves the degree of freedom in designing each of the first claw portion, the second claw portion, the first retaining portion, and the second retaining portion, compared to, for example, a case where the first claw portion and the second claw portion also function as retaining portions.

[0011] The cage of the present invention may be [5] "the cage according to [4] above, wherein the first retaining portion is formed integrally with the first claw portion, the second retaining portion is formed integrally with the second claw portion, a first groove is formed between the first retaining portion and the first claw portion, and a second groove is formed between the second retaining portion and the second claw portion." This suppresses displacement of the first retaining portion due to displacement of the first claw portion in the circumferential direction when the first claw portion and the second claw portion are engaged, and suppresses displacement of the second retaining portion due to displacement of the second claw portion in the circumferential direction. Therefore, when the first claw portion and the second claw portion are engaged, interference between the first retaining portion and the second retaining portion and the rolling elements is suppressed, and as a result, a decrease in assembly efficiency of the cage is suppressed.

[0012] The cage of the present invention may be [6] "the cage according to the above [4] or [5], wherein the first retaining portion has a first through hole that opens into the first retaining surface, and the second retaining portion has a second through hole that opens into the second retaining surface." This ensures the supply of lubricating oil to the first retaining surface via the first through hole, and the supply of lubricating oil to the second retaining surface via the second through hole.

[0013] The cage of the present invention may be [7] "the cage according to any one of the above [1] to [6], wherein a gap is formed between the first and second turnpick portions when the first annular body, the second annular body, and the rolling elements are in contact with each other in the axial direction." This suppresses assembly defects between the first and second annular bodies caused by variations in the dimension of the first or second turnpick portion in the axial direction.

[0014] The cage of the present invention may be [8] "the cage according to any one of the above [1] to [7], wherein each of the first body portion and the second body portion has a plate shape with the axial direction as a thickness direction." This allows the cage to be made smaller in size in the axial direction. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a cage that can stabilize the engagement between the first annular body and the second annular body. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a front view of a rolling bearing according to an embodiment. [Figure 2] FIG. 2 is a perspective view of the cage shown in FIG. 1. [Figure 3] FIG. 2 is a side view of a portion of the retainer shown in FIG. 1. [Figure 4] FIG. 2 is a side view of a portion of the retainer shown in FIG. 1. [Figure 5] 2 is a perspective view of a portion of the first annular body shown in FIG. 1. FIG. [Figure 6] 2 is a perspective view of a portion of the second annular body shown in FIG. 1. FIG. [Figure 7] FIG. 10 is a partially enlarged view of a cage according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each drawing, the same or corresponding parts are designated by the same reference numerals, and duplicated explanations will be omitted.

[0018] As shown in Figure 1, rolling bearing 1 comprises an inner ring 2, an outer ring 3, multiple rolling elements 4, and a cage 5. Hereinafter, the direction parallel to the center line A of rolling bearing 1 will be referred to as the axial direction, the direction perpendicular to center line A will be referred to as the radial direction, and the direction along the circumference centered on center line A when viewed from a direction parallel to center line A will be referred to as the circumferential direction.

[0019] The inner ring 2 has a raceway surface 2a. The raceway surface 2a faces outward in the radial direction and extends annularly in the circumferential direction. As an example, the inner surface of the inner ring 2 in the radial direction is fitted onto a shaft (not shown).

[0020] The outer ring 3 is disposed radially outward of the inner ring 2. The outer ring 3 has a raceway surface 3a. The raceway surface 3a faces radially inward and extends annularly in the circumferential direction. As an example, the radially outer surface of the outer ring 3 is fitted into a housing (not shown).

[0021] The plurality of rolling elements 4 are arranged between the inner ring 2 and the outer ring 3. More specifically, the plurality of rolling elements 4 are arranged between the raceway surface 2a of the inner ring 2 and the raceway surface 3a of the outer ring 3. In this embodiment, each rolling element 4 is a ball (spherical body).

[0022] The cage 5 holds a plurality of rolling elements 4. More specifically, the cage 5 holds the plurality of rolling elements 4 at equal intervals so that each rolling element 4 can roll freely between the raceway surface 2a of the inner ring 2 and the raceway surface 3a of the outer ring 3. The cage 5 has a first annular body 51 and a second annular body 52 that are combined with each other. The first annular body 51 and the second annular body 52 are aligned in the axial direction. The first annular body 51 and the second annular body 52 are each made of a material such as a resin (e.g., PA66, PA46, etc.).

[0023] As shown in FIG. 2, the first annular body 51 has a first main body portion 53, a plurality of first claw portions 54, and a plurality of first retaining portions 55. The first main body portion 53 extends in the circumferential direction and has an annular shape. In this embodiment, the first main body portion 53 has an annular shape. The first main body portion 53 has a plate shape with the axial direction as its thickness direction. The first main body portion 53 includes a main surface 53a and a main surface 53b. The main surface 53a faces the second annular body 52 in the axial direction. The main surface 53b faces the opposite side to the main surface 53a in the axial direction.

[0024] The multiple first claw portions 54 are aligned along the circumferential direction. The first claw portions 54 protrude from the main surface 53a of the first main body portion 53 toward the second annular body 52. ​​The multiple first retaining portions 55 are aligned along the circumferential direction. The first retaining portions 55 protrude from the main surface 53a of the first main body portion 53 toward the second annular body 52. ​​The first retaining portions 55 are open to the inside in the radial direction, the outside in the radial direction, and toward the second annular body 52 in the axial direction. The first retaining portions 55 include a first retaining surface 55a that retains the rolling elements 4.

[0025] The first claw portions 54 and the first retaining portions 55 are each a partial area of ​​the side wall of the cylinder. When viewed in the axial direction, the first claw portions 54 and the first retaining portions 55 are located between the inner edge and the outer edge of the first main body portion 53. Because the first main body portion 53 is plate-shaped with its thickness in the axial direction and the first claw portions 54 and the first retaining portions 55 are each a partial area of ​​the side wall of the cylinder, the first annular body 51 can be made thinner and more compact.

[0026] The second annular body 52 has a second main body portion 56, a plurality of second claw portions 57, and a plurality of second retaining portions 58. The second main body portion 56 extends in the circumferential direction and has an annular shape. In this embodiment, the second main body portion 56 has an annular shape. The second main body portion 56 has a plate shape with the axial direction as its thickness direction. The second main body portion 56 includes a main surface 56a and a main surface 56b. The main surface 56a faces the first annular body 51 in the axial direction. The main surface 56b faces the opposite side to the main surface 56a in the axial direction.

[0027] The multiple second claw portions 57 are aligned along the circumferential direction. The second claw portions 57 protrude from the main surface 56a of the second main body portion 56 toward the first annular body 51. The multiple second retaining portions 58 are aligned along the circumferential direction. The second retaining portions 58 protrude from the main surface 56a of the second main body portion 56 toward the first annular body 51. The second retaining portions 58 are open to the radially inner side, the radially outer side, and the first annular body 51 side in the axial direction. The second retaining portions 58 include second retaining surfaces 58a that retain the rolling elements 4.

[0028] The second claw portions 57 and the second retaining portions 58 are each a partial area of ​​the side wall of the cylinder. When viewed in the axial direction, the second claw portions 57 and the second retaining portions 58 are located between the inner edge and the outer edge of the second main body portion 56. Because the second main body portion 56 is plate-shaped with its thickness in the axial direction and the second claw portions 57 and the second retaining portions 58 are each a partial area of ​​the side wall of the cylinder, the second annular body 52 can be made thinner and more compact.

[0029] The multiple first claw portions 54 and the multiple second claw portions 57 correspond one-to-one in the axial direction. Corresponding pairs of first claw portions 54 and second claw portions 57 engage with each other. The multiple first retaining portions 55 and the multiple second retaining portions 58 correspond one-to-one in the axial direction. A single pocket 50 is formed by a corresponding pair of first retaining portions 55 and second retaining portions 58. In this embodiment, the first retaining surface 55a of the first retaining portion 55 and the second retaining surface 58a of the second retaining portion 58 form the pocket 50. A rolling element 4 is arranged in the pocket 50.

[0030] FIG. 3 shows the corresponding first claw portion 54 and second claw portion 57. As shown in FIG. 3, the first claw portion 54 includes a first extending portion 541 and a first barbed portion 542. The first extending portion 541 extends along the axial direction. More specifically, the first extending portion 541 extends along the axial direction from the main surface 53a of the first main body portion 53 to the second main body portion 56. The first barbed portion 542 protrudes from the first extending portion 541 to one side in the circumferential direction (for example, the right side in FIG. 3). More specifically, the first barbed portion 542 protrudes to one side in the circumferential direction from an end of the first extending portion 541 opposite the first main body portion 53.

[0031] The first folded portion 542 includes an end surface 54a, a locking surface 54b, and an inclined surface 54c. The end surface 54a intersects with the circumferential direction. The end surface 54a faces the second claw portion 57 in the circumferential direction. The locking surface 54b is located at the end of the end surface 54a on the first main body portion 53 side. The locking surface 54b intersects with the axial direction. In this embodiment, the locking surface 54b is a flat surface perpendicular to the axial direction. The locking surface 54b faces the first main body portion 53 in the axial direction. The inclined surface 54c is located at the end of the end surface 54a on the second annular body 52 side. The inclined surface 54c is inclined toward the other side in the circumferential direction (e.g., the left side in FIG. 3 ) as it moves from the first main body portion 53 side toward the second annular body 52 side. The inclined surface 54c can guide the first claw portion 54 to the second claw portion 57.

[0032] The second claw portion 57 includes a second extending portion 571 and a second barbed portion 572. The second extending portion 571 extends along the axial direction. More specifically, the second extending portion 571 extends along the axial direction from the main surface 56a of the second main body portion 56 to the first main body portion 53. The second barbed portion 572 protrudes from the second extending portion 571 to the other side in the circumferential direction. More specifically, the second barbed portion 572 protrudes from an end of the second extending portion 571 opposite the second main body portion 56 to the other side in the circumferential direction.

[0033] The second folded portion 572 includes an end surface 57a, a locking surface 57b, and an inclined surface 57c. The end surface 57a intersects with the circumferential direction. The end surface 57a faces the first claw portion 54 in the circumferential direction. The locking surface 57b is located at the end of the end surface 57a on the second main body portion 56 side. The locking surface 57b intersects with the axial direction. In this embodiment, the locking surface 57b is a flat surface perpendicular to the axial direction. The locking surface 57b faces the second main body portion 56 in the axial direction. The inclined surface 57c is located at the end of the end surface 57a on the first annular body 51 side. The inclined surface 57c inclines toward one side in the circumferential direction from the second main body portion 56 side toward the first annular body 51 side. The inclined surface 57c can guide the second claw portion 57 to the first claw portion 54.

[0034] The first barb portion 542 is disposed in an area defined by the second main body portion 56, the second extending portion 571, and the second barb portion 572. The second barb portion 572 is disposed in an area defined by the first main body portion 53, the first extending portion 541, and the first barb portion 542. The second extending portion 571 is located on one side of the first extending portion 541 in the circumferential direction. The second barb portion 572 is located on the opposite side of the first barb portion 542 from the second main body portion 56. The second barb portion 572 faces the first barb portion 542 in the axial direction. The locking surface 57b of the second barb portion 572 faces the locking surface 54b of the first barb portion 542. The end surface 54a of the first barb portion 542 is in contact with the second extending portion 571. The end surface 57a of the second barb portion 572 is in contact with the first extending portion 541. In this way, the corresponding pair of first claw portions 54 and second claw portions 57 are engaged facing each other in both the circumferential and axial directions, thereby restricting axial and circumferential displacement of the second annular body 52 relative to the first annular body 51.

[0035] The first claw portion 54 includes a first tip portion 54d located on the opposite side to the first main body portion 53. The first tip portion 54d overlaps with the second main body portion 56 when viewed from the radial direction. The second claw portion 57 includes a second tip portion 57d located on the opposite side to the second main body portion 56. The second tip portion 57d overlaps with the first main body portion 53 when viewed from the radial direction.

[0036] A first hole 53c (see also FIG. 2) is formed in the main surface 53a of the first main body portion 53 (the surface of the first main body portion 53 facing the second annular body 52). In the present embodiment, the first hole 53c penetrates the first main body portion 53. That is, the first hole 53c is open to both the main surface 53a and the main surface 53b. The width of the first hole 53c in the radial direction is slightly larger than the width of the second tip portion 57d in the radial direction. The width of the first hole 53c in the circumferential direction is larger than the width of the second tip portion 57d in the circumferential direction. The width of the first hole 53c in the circumferential direction is larger than the width of the first hole 53c in the radial direction (see FIG. 6, for example). The difference between the width of the first hole 53c in the circumferential direction and the width of the second tip portion 57d in the circumferential direction is larger than the difference between the width of the first hole 53c in the radial direction and the width of the second tip portion 57d in the radial direction. The second tip portion 57d is disposed inside the first hole 53c.

[0037] A second hole 56c is formed in the main surface 56a of the second main body portion 56 (the surface of the second main body portion 56 facing the first annular body 51). In the present embodiment, the second hole 56c penetrates the second main body portion 56. That is, the second hole 56c is open to both the main surface 56a and the main surface 56b. The width of the second hole 56c in the radial direction is slightly larger than the width of the first tip portion 54d in the radial direction. The width of the second hole 56c in the circumferential direction is larger than the width of the first tip portion 54d in the circumferential direction. The width of the second hole 56c in the circumferential direction is larger than the width of the second hole 56c in the radial direction (see, for example, FIG. 5). The difference between the width of the second hole 56c in the circumferential direction and the width of the first tip portion 54d in the circumferential direction is larger than the difference between the width of the second hole 56c in the radial direction and the width of the first tip portion 54d in the radial direction. The first tip portion 54d is disposed inside the second hole 56c.

[0038] When the first annular body 51, the second annular body 52, and the rolling elements 4 are in contact with one another in the axial direction, a gap G is formed between the locking surface 54b of the first turned-up portion 542 and the locking surface 57b of the second turned-up portion 572. In other words, when the first annular body 51, the second annular body 52, and the rolling elements 4 are in contact with one another in the axial direction, the first turned-up portion 542 and the second turned-up portion 572 are separated from one another (are not in contact with one another).

[0039] FIG. 4 shows the corresponding first retaining portion 55 and second retaining portion 58. As shown in FIG. 4, the first retaining portion 55 is located on the other circumferential side of the first claw portion 54. The first retaining portion 55 includes a first main pillar 551 and a first sub-pillar 552. The first main pillar 551 protrudes from the main surface 53a of the first main body portion 53 toward the second annular body 52. ​​The first main pillar 551 includes a retaining surface 55b and an end surface 55c. The retaining surface 55b is the surface of the first main pillar 551 opposite to the first claw portion 54. The retaining surface 55b is part of a spherical surface. The retaining surface 55b is part of the first retaining surface 55a. The end surface 55c is the surface of the first main pillar 551 opposite to the first main body portion 53. The end surface 55c intersects with the axial direction. The end surface 55c faces the second annular body 52. ​​Note that the region of the holding surface 55b that is connected to the end surface 55c may be a part of a cylindrical surface having an axis along the radial direction.

[0040] The first main pillar 551 is integrally formed from the same material as the first claw portion 54. The first main pillar 551 is connected to the first claw portion 54. The first main pillar 551 and the first claw portion 54 are each a partial area of ​​a protrusion that protrudes from the first main body portion 53. A first groove 55d is formed between the first main pillar 551 and the first claw portion 54. The first groove 55d is recessed from the end face 55c toward the first main body portion 53.

[0041] The first sub-pillar 552 is located on the other circumferential side of the first main pillar 551. The first sub-pillar 552 protrudes from the main surface 53a of the first main body portion 53 toward the second annular body 52. ​​The first sub-pillar 552 includes a retaining surface 55e and an end surface 55f. The retaining surface 55e is the surface of the first sub-pillar 552 facing the first main pillar 551. The retaining surface 55e is part of a cylindrical surface having an axis along the radial direction. The retaining surface 55e is part of the first retaining surface 55a. The end surface 55f is the surface of the first sub-pillar 552 facing away from the first main body portion 53. The end surface 55f intersects with the axial direction. The end surface 55f faces the second annular body 52. ​​The end surface 55f is located on the first main body portion 53 side relative to the end surface 55c. The first sub-pillar 552 is spaced apart from the second claw portion 57 located on the other side of the first sub-pillar 552 in the circumferential direction.

[0042] The second retaining portion 58 is located on one side in the circumferential direction relative to the second claw portion 57. The second retaining portion 58 includes a second main pillar 581 and a second sub-pillar 582. The second main pillar 581 protrudes from the main surface 56a of the second main body portion 56 toward the first annular body 51. The second main pillar 581 includes a retaining surface 58b and an end surface 58c. The retaining surface 58b is the surface of the second main pillar 581 opposite to the second claw portion 57. The retaining surface 58b is part of a spherical surface. The retaining surface 58b is part of the second retaining surface 58a. The end surface 58c is the surface of the second main pillar 581 opposite to the second main body portion 56. The end surface 58c intersects with the axial direction. The end surface 58c faces the first annular body 51. End face 58c faces end face 55f of first sub-pillar 552 of first holding part 55. End face 58c is spaced apart from end face 55f. Note that the region of holding surface 58b that is connected to end face 58c may be part of a cylindrical surface having an axis along the radial direction.

[0043] The second main pillar 581 is integrally formed from the same material as the second claw portion 57. The second main pillar 581 is connected to the second claw portion 57. The second main pillar 581 and the second claw portion 57 are each a partial area of ​​the protrusion that protrudes from the second main body portion 56. A second groove 58d is formed between the second main pillar 581 and the second claw portion 57. The second groove 58d is recessed from the end face 58c toward the second main body portion 56.

[0044] The second sub-pillar 582 is located on one side in the circumferential direction relative to the second main pillar 581. The second sub-pillar 582 protrudes from the main surface 56a of the second main body portion 56 toward the first annular body 51. The second sub-pillar 582 includes a retaining surface 58e and an end surface 58f. The retaining surface 58e is the surface of the second sub-pillar 582 facing the second main pillar 581. The retaining surface 58e is part of a cylindrical surface having an axis along the radial direction. The retaining surface 58e is part of the second retaining surface 58a. The end surface 58f is the surface of the second sub-pillar 582 opposite to the second main body portion 56. The end surface 58f intersects with the axial direction. The end surface 58f faces the first annular body 51. The end surface 58f faces the end surface 55c of the first main pillar 551 of the first retaining portion 55. The end face 58f is spaced apart from the end face 55c. The end face 58f is located closer to the second main body portion 56 than the end face 58c. The second sub-pillar 582 is spaced apart from the first claw portion 54. The second sub-pillar 582 is spaced apart from the first claw portion 54 located on one side of the second sub-pillar 582 in the circumferential direction.

[0045] 5, the first support surface 55a includes a support surface 55g. The support surface 55g is located between the support surface 55b of the first main pillar 551 and the support surface 55e of the first sub-pillar 552. The support surface 55g is a concavely curved surface. The support surface 55g is a part of a spherical surface.

[0046] The first retaining portion 55 has a first through hole 55h that opens to the first retaining surface 55a. The first through hole 55h is formed in the retaining surface 55g. The first through hole 55h penetrates the first annular body 51. The first through hole 55h opens to both the first retaining surface 55a and the main surface 53b. The first through hole 55h has, for example, a circular shape. The main surface 53b may include a concave surface that extends annularly along the circumferential direction and is recessed toward the main surface 53a, or a convex surface that extends annularly along the circumferential direction and protrudes toward the opposite side from the main surface 53a. This allows the thickness of the first main body portion 53 to be optimized, thereby enabling the first annular body 51 to be made more compact.

[0047] 6, the second holding surface 58a includes a holding surface 58g. The holding surface 58g is located between the holding surface 58b of the second main pillar 581 and the holding surface 58e of the second sub-pillar 582. The holding surface 58g is a concavely curved surface. The holding surface 58g is a part of a spherical surface.

[0048] The second retaining portion 58 has a second through hole 58h that opens to the second retaining surface 58a. The second through hole 58h is formed in the retaining surface 58g. The second through hole 58h penetrates the second annular body 52. ​​The second through hole 58h opens to both the second retaining surface 58a and the main surface 56b. The second through hole 58h has, for example, a circular shape. The main surface 56b may include a concave surface that extends annularly along the circumferential direction and is recessed toward the main surface 56a, or a convex surface that extends along the circumferential direction and protrudes toward the opposite side from the main surface 56a. This allows the thickness of the second main body portion 56 to be optimized, thereby enabling the second annular body 52 to be made more compact.

[0049] As described above, in the cage 5, the second barbed portion 572 is located on the opposite side of the first barbed portion 542 from the second main body portion 56 and faces the first barbed portion 542 in the axial direction. This allows the first annular body 51 and the second annular body 52 to be locked to each other in the axial direction. Moreover, the second extending portion 571 is located on one side of the first extending portion 541 in the circumferential direction, the first barbed portion 542 protrudes from the first extending portion 541 to one side in the circumferential direction, and the second barbed portion 572 protrudes from the second extending portion 571 to the other side in the circumferential direction. As a result, even if the first and second turned-up portions 542 and 572 are displaced radially (toward the outside in the radial direction) due to centrifugal force caused by rotation of the cage 5 or elliptical deformation of the cage 5, the amount of displacement of the first and second turned-up portions 542 and 572 is substantially the same, ensuring stable engagement between the first and second turned-up portions 542 and 572. Therefore, the cage 5 can ensure stable engagement between the first and second annular bodies 51 and 52.

[0050] The first claw 54 includes a first tip portion 54d located on the opposite side from the first main body 53, and the second claw 57 includes a second tip portion 57d located on the opposite side from the second main body 56. A first hole 53c is formed in the main surface 53a of the first main body 53, and a second hole 56c is formed in the main surface 56a of the second main body 56. The first tip portion 54d is disposed in the second hole 56c, and the second tip portion 57d is disposed in the first hole 53c. This restricts radial movement of the first claw 54 and the second claw 57. This further stabilizes the engagement between the first annular body 51 and the second annular body 52.

[0051] The width of the first hole 53c in the circumferential direction is larger than the width of the first hole 53c in the radial direction. The width of the second hole 56c in the circumferential direction is larger than the width of the second hole 56c in the radial direction. This allows the first tip portion 54d of the first claw portion 54 to be positioned in the second hole 56c while deforming the first claw portion 54 in the circumferential direction, and the second tip portion 57d of the second claw portion 57 to be positioned in the first hole 53c while deforming the second claw portion 57 in the circumferential direction.

[0052] The first annular body 51 has a first retaining portion 55 located on the other circumferential side of the first claw portion 54, and the second annular body 52 has a second retaining portion 58 located on one circumferential side of the second claw portion 57. The first retaining portion 55 includes a first retaining surface 55a that retains the rolling element 4, and the second retaining portion 58 includes a second retaining surface 58a that retains the rolling element 4. This improves the degree of freedom in designing each of the first claw portion 54, the second claw portion 57, the first retaining portion 55, and the second retaining portion 58, compared to, for example, when the claw portion also functions as a retaining portion.

[0053] The first retaining portion 55 is formed integrally with the first claw portion 54, and the second retaining portion 58 is formed integrally with the second claw portion 57. A first groove 55d is formed between the first retaining portion 55 and the first claw portion 54, and a second groove 58d is formed between the second retaining portion 58 and the second claw portion 57. As a result, when the first claw portion 54 and the second claw portion 57 are engaged with each other, displacement of the first retaining portion 55 caused by displacement of the first claw portion 54 in the circumferential direction is suppressed, and displacement of the second retaining portion 58 caused by displacement of the second claw portion 57 in the circumferential direction is suppressed. Therefore, when the first claw portion 54 and the second claw portion 57 are engaged with each other, interference between the first retaining portion 55 and the second retaining portion 58 and the rolling elements 4 is suppressed, and as a result, a decrease in the assembly efficiency of the cage 5 is suppressed. Furthermore, the influence of the behavior of the first claw portion 54 on the first holding portion 55 is alleviated, and the influence of the behavior of the second claw portion 57 on the second holding portion 58 is alleviated.

[0054] A first through hole 55h opening to the first holding surface 55a is formed in the first holding portion 55, and a second through hole 58h opening to the second holding surface 58a is formed in the second holding portion 58. This ensures that the lubricating oil is supplied to the first holding surface 55a via the first through hole 55h, and that the lubricating oil is supplied to the second holding surface 58a via the second through hole 58h.

[0055] When the first annular body 51, the second annular body 52, and the rolling elements 4 are in contact with each other in the axial direction, a gap G is formed between the first return portion 542 and the second return portion 572. This prevents assembly defects between the first annular body 51 and the second annular body 52 caused by variations in the axial dimension of the first return portion 542 or the axial dimension of the second return portion 572. Furthermore, because movement of the first annular body 51 or the second annular body 52 in the axial direction is permitted at the level of the gap G, damage to the first annular body 51 or the second annular body 52 caused by the behavior of the rolling elements 4 is prevented.

[0056] Each of the first main body portion 53 and the second main body portion 56 has a plate shape with the thickness direction in the axial direction. This ensures the rigidity of the region of the first main body portion 53 where the pocket 50 is formed and the rigidity of the region of the second main body portion 56 where the pocket 50 is formed, and reduces the stress generated in the pocket 50. This allows the cage 5 to be made thinner, and the cage 5 can be made more compact.

[0057] The present invention is not limited to the above-described embodiment. As shown in FIG. 7 , the locking surface 54b of the first folded portion 542 may be inclined with respect to the axial direction. The locking surface 54b may be inclined toward the second folded portion 572 as it moves from the other circumferential side to one circumferential side. The locking surface 57b of the second folded portion 572 may be inclined with respect to the axial direction. The locking surface 57b may be inclined toward the first folded portion 542 as it moves from one circumferential side to the other circumferential side. This restricts circumferential displacement of the second annular body 52 relative to the first annular body 51.

[0058] In the embodiment, the first hole 53c is open to both the main surface 53a and the main surface 53b, but the first hole 53c does not have to be open to the main surface 53b. It is sufficient that the second tip portion 57d of the second claw portion 57 is arranged in the first hole 53c. In the embodiment, the second hole 56c is open to both the main surface 56a and the main surface 56b, but the second hole 56c does not have to be open to the main surface 56b. It is sufficient that the first tip portion 54d of the first claw portion 54 is arranged in the second hole 56c.

[0059] In the embodiment, the first holding part 55 has the first main pillar 551 and the first sub pillar 552, but the first holding part 55 does not have to have either the first main pillar 551 or the first sub pillar 552. In the embodiment, the second holding part 58 has the second main pillar 581 and the second sub pillar 582, but the second holding part 58 does not have to have either the second main pillar 581 or the second sub pillar 582.

[0060] In the embodiment, the first holding portion 55 is formed integrally with the first claw portion 54, but the first holding portion 55 may be formed separately from the first claw portion 54. The first holding portion 55 may be spaced apart from the first claw portion 54. In the embodiment, the second holding portion 58 is formed integrally with the second claw portion 57, but the second holding portion 58 may be formed separately from the second claw portion 57. The second holding portion 58 may be spaced apart from the second claw portion 57. [Explanation of symbols]

[0061] 5... Cage, 51... First annular body, 52... Second annular body, 53... First main body, 53a... Main surface (surface), 53c... First hole, 54... First claw, 54d... First tip portion, 55... First holding part, 55a... First holding surface, 55d... First groove, 55h... First through hole, 56... Second main body, 56a ...Main surface (surface), 56c...Second hole, 57...Second claw part, 57d...Second tip part, 58...Second holding part, 58a...Second holding surface, 58d...Second groove, 58h...Second through hole, 541...First extension part, 542...First return part, 571...Second extension part, 572...Second return part, G...Gap.

Claims

1. a first annular body; a second annular body axially aligned with the first annular body, the first annular body has a first main body portion having an annular shape and a first claw portion protruding from the first main body portion toward the second annular body, the second annular body has a second main body portion having an annular shape and a second claw portion protruding from the second main body portion toward the first annular body, The first claw portion includes a first extending portion extending along the axial direction and a first barbed portion protruding from the first extending portion to one side in the circumferential direction, the second claw portion includes a second extending portion extending along the axial direction and a second barbed portion protruding from the second extending portion to the other side in the circumferential direction, the second extension portion is located on one side in the circumferential direction with respect to the first extension portion, The second barb portion is located on the opposite side of the first barb portion from the second body portion and faces the first barb portion in the axial direction.

2. the first claw portion includes a first tip portion located on the opposite side to the first main body portion, the second claw portion includes a second tip portion located on the opposite side to the second main body portion, a first hole is formed in a surface of the first main body portion facing the second annular body, a second hole is formed in a surface of the second main body portion facing the first annular body, the first tip portion is disposed in the second hole; The retainer of claim 1 , wherein the second tip portion is disposed in the first hole.

3. a width of the first hole in a circumferential direction is greater than a width of the first hole in a radial direction; The cage according to claim 2 , wherein a width of the second hole in the circumferential direction is larger than a width of the second hole in the radial direction.

4. the first annular body further includes a first retaining portion located on the other side in the circumferential direction relative to the first claw portion, the second annular body further includes a second holding portion located on one side in the circumferential direction with respect to the second claw portion, the first retaining portion includes a first retaining surface that retains the rolling element, The cage according to claim 1 , wherein the second retaining portion includes a second retaining surface that retains the rolling element.

5. the first holding portion is integrally formed with the first claw portion, the second holding portion is integrally formed with the second claw portion, a first groove is formed between the first holding portion and the first claw portion, The cage according to claim 4 , wherein a second groove is formed between the second holding portion and the second claw portion.

6. a first through hole that opens to the first holding surface is formed in the first holding portion; The cage according to claim 4 , wherein the second holding portion is formed with a second through hole that opens into the second holding surface.

7. 2. The cage according to claim 1, wherein a gap is formed between the first and second turned-up portions when the first annular body, the second annular body, and the rolling elements are in axial contact with each other.

8. The cage according to claim 1 , wherein each of the first body portion and the second body portion has a plate shape with a thickness direction extending in the axial direction.

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