JP2010281406A - Thrust roller bearing - Google Patents

Abstract

To provide a thrust roller bearing capable of suppressing roller penetration into a cage and realizing high rigidity and high capacity.
In a thrust roller bearing, both axial end surfaces of each roller are spherical convex surfaces having a center of curvature on a central axis α of each roller, and each roller is connected to the radial direction of a cage. In the state of being displaced to the outermost side, the center portion of the outer diameter side end face 30 of each roller 2 is in contact with the inner peripheral surface 21a of the second outer diameter side cylindrical portion 21 so that each roller 2 has a diameter of the cage 3. The center part of the inner diameter side end face 31 of each roller 2 and the outer peripheral face 20a of the second inner diameter side cylindrical part 20 are in contact with each other while being displaced inward in the direction.
[Selection] Figure 2

Description

  The present invention relates to a thrust roller bearing used in a rotation support portion of various mechanical devices such as a transmission of a vehicle, a torque converter, a compressor for a car air conditioner, and a machine tool.

  A thrust roller bearing is attached to a rotating portion of a transmission or the like so as to support a thrust load applied to the rotating shaft or the like (see, for example, Patent Document 1). As shown in FIG. 6, the thrust roller bearing 101 used for such a rotating portion includes a plurality of rollers 102 (including needles) arranged in a radial direction, a cage 103 that holds these rollers 102, A pair of thrust traces (not shown) that sandwich the plurality of rollers 102 from both sides are provided. The cage 103 is constituted by two members having higher rigidity than that constituted by a single member.

  That is, the retainer 103 includes first and second retainer elements 105 and 106 each having a U-shaped cross section and formed in an annular shape as a whole. The first cage element 105 has a first inner diameter side cylindrical portion 109 and a first outer diameter side cylindrical portion 110 formed concentrically with each other on both inner and outer peripheral edges of the first annular portion 108. At a plurality of locations in the circumferential direction of the first annular portion 108, rectangular first through holes 111 that are long in the radial direction are provided. The second cage element 106 also has a second inner diameter side cylindrical portion 113 and a second outer diameter side cylindrical portion 114 formed concentrically with each other on the inner and outer peripheral edges of the second annular portion 112. At a plurality of locations in the circumferential direction of the second annular portion 112, rectangular second through holes 115 that are long in the radial direction are provided.

  The first and second cage elements 105 and 106 constitute a pocket p in a state in which the first through holes 111 and the second through holes 115 are aligned with each other in the axial direction, and the first outer diameter side cylinders. The second outer diameter side cylindrical portion 114 is fitted on the inner diameter side of the portion 110 and combined with the second inner diameter side cylindrical portion 113 being fitted on the outer diameter side of the first inner diameter side cylindrical portion 109. Then, the first outer diameter side cylindrical portion 110 is prevented from being separated from each other, for example, by bending the distal end edge radially inward.

  In the other thrust roller bearing 101a shown in FIG. 7, the outer diameter side and inner diameter side end surfaces 121a and 124 of the roller 102a are spherical convex surfaces having a center of curvature on the central axis α of each roller 102a. As for the diameter side and inner diameter side end faces 121a and 124, the respective central portions protrude most in the axial direction. Further, the first through holes 111a and the second through holes 115a of the first and second cage elements 105a and 106a are formed at radially outer portions of the first and second annular portions 108a and 112a. Each of the second through holes 115a is open to the outer peripheral edge of the second annular portion 112a. Then, in a state where each roller 102a held in each pocket p is displaced to the outermost side in the radial direction of the cage 103a, the center portion of the outer diameter side end surface 121a and the inner peripheral surface of the second outer diameter side cylindrical portion 114a Are in contact with each other.

Japanese Patent Laying-Open No. 2005-164023

  Meanwhile, in the thrust roller bearing 101 shown in FIG. 6, a force directed radially outward of the cage 103 is applied to each roller 102 based on the centrifugal force during use. Then, the outer diameter side end surface 121 of each roller 102 is pressed against the outer diameter side peripheral edge portions 122 a and 122 b of the cage 103 by this force. Actually, the outer diameter side end face 121 is pressed against one of the outer diameter side peripheral edge parts 122a and 122b on the outer diameter side peripheral edge part 122a (or 122b) based on manufacturing errors and axial displacement of the cage 103. In sliding contact with each other. For this reason, when the use rotational speed of the thrust roller bearing 101 is increased and the centrifugal force is increased, the surface pressure P at the sliding contact portion is increased. Further, since the sliding contact portion exists at a position away from the central axis α of each roller 102, the sliding speed V between the outer diameter side peripheral edge portion 122a (or 122b) and the outer diameter side end surface 121 is also increased to some extent. Become. For this reason, it is a product of the surface pressure P and the sliding speed V, and the PV value as a parameter affecting the wear increases. As a result, a dent based on wear is formed in the outer peripheral edge 122a (or 122b), and the roller 102 sinks into the back side of the first annular part 108 (or the second annular part 112) in which the dent is formed, The rollers 102 may not roll smoothly, and the efficiency of a mechanical device such as a transmission may deteriorate.

  On the other hand, in the thrust roller bearing 101a shown in FIG. 7, the outer diameter side end surface 121a of each roller 102a and the diameter of the cage 103a among the peripheral portions of the first and second through holes 111a and 115a constituting each pocket p. It is possible to prevent the outer diameter side peripheral edge portions 125a and 125b that are on the outside in the direction from rubbing each other, or even when rubbing each other, the PV value of the rubbing portion can be kept low. As a result, the wear of the abutting portion between the outer diameter side end surface 121a and the inner peripheral surface of the second outer diameter side cylindrical portion 114a is suppressed to a small extent, and the penetration of the roller 102a into the cage 103a is suppressed. However, in the thrust roller bearing 101a shown in FIG. 7, it is desired to further increase the bearing capacity.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a thrust roller bearing capable of suppressing the dive of the roller into the cage and realizing high rigidity and high capacity. is there.

(1) A thrust roller bearing comprising a plurality of rollers arranged in a radial direction, and an annular retainer having a plurality of pockets for holding the plurality of rollers in a freely rollable manner,
The cage is configured by overlapping first and second cage elements in the axial direction,
The first retainer element includes a first annular portion having a plurality of radially extending rectangular first through holes, which form the pockets, and a plurality of circumferential circumferential locations, and an inner peripheral edge of the first annular portion. A formed first inner diameter side cylindrical portion, and a first outer diameter side cylindrical portion formed on the outer peripheral edge of the first annular portion,
The second cage element includes a second annular portion having a plurality of radially extending rectangular through holes that form the pockets at a plurality of locations in the circumferential direction, and an inner peripheral edge of the second annular portion. A second inner diameter side cylindrical portion formed, and a second outer diameter side cylindrical portion formed on the outer peripheral edge of the second annular portion,
The first and second cage elements are arranged on the inner diameter side of the first outer diameter side cylindrical portion with the first through holes and the second through holes aligned with each other in the axial direction. While fitting the diameter side cylindrical portion, the second inner diameter side cylindrical portion is fitted on the outer diameter side of the first inner diameter side cylindrical portion,
In a state where the rollers are displaced to the outermost side in the radial direction of the cage, the outer diameter side end surface of the rollers and the inner peripheral surface of the second outer diameter side cylindrical portion are in contact with each other,
A thrust roller, wherein the inner diameter side end surface of each roller abuts the outer peripheral surface of the second inner diameter side cylindrical portion in a state where the rollers are displaced inward in the radial direction of the cage. bearing.
(2) Each axial end surface of each roller is a spherical convex surface having the center of curvature on the central axis of each roller,
In a state where the rollers are displaced to the outermost side in the radial direction of the cage, the center portion of the outer diameter side end surface of the rollers and the inner peripheral surface of the second outer diameter side cylindrical portion abut,
The center portion of the inner diameter side end surface of each roller and the outer peripheral surface of the second inner diameter side cylindrical portion are in contact with each roller in a state of being displaced inwardly in the radial direction of the cage. The thrust roller bearing according to (1).
(3) The both radial ends of the first through hole are on the outer diameter side of the inner peripheral surface of the second outer diameter side cylindrical portion, and on the inner diameter side of the outer peripheral surface of the second inner diameter side cylindrical portion. Located in each
Both end portions in the radial direction of the second through hole are located in the second outer diameter side cylindrical portion and the second inner diameter side cylindrical portion, respectively, beyond the second annular portion. The thrust roller bearing according to 1) or (2).
(4) It further comprises a thrust race provided with a race portion with which the plurality of rollers abut, and an outer cylinder portion formed over the entire circumference on the outer peripheral edge of the race portion,
The first and second cage elements are coupled to each other by bending the tip edge of the first inner diameter side cylindrical portion radially outward over the entire circumference,
The thrust trace has a locking portion that is locked to a leading edge of the first outer diameter side cylindrical portion by partially bending the distal end portion of the outer cylindrical portion at a plurality of locations in the circumferential direction. The thrust roller bearing according to any one of (1) to (3).
(5) It further comprises a thrust trace comprising a race portion with which the plurality of rollers abut, and an inner cylinder portion formed over the entire circumference on the inner periphery of the race portion,
The first and second cage elements are coupled to each other by bending the tip edge of the first outer diameter side cylindrical portion radially inward over the entire circumference;
The thrust race has a locking portion that is locked to a tip edge of the first inner diameter side cylindrical portion by partially bending the tip portion of the inner cylinder portion at a plurality of locations in the circumferential direction. The thrust roller bearing according to any one of (1) to (3).

  According to the thrust roller bearing of the present invention, high rigidity can be realized by configuring with the first and second cage elements. In addition, in a state where each roller is displaced to the outermost side in the radial direction of the cage, the outer diameter side end surface of each roller and the inner peripheral surface of the second outer diameter side cylindrical portion abut, and each roller is held in the cage. Since the inner diameter side end surface of each roller and the outer peripheral surface of the second inner diameter side cylindrical portion are in contact with each other with the innermost displacement in the radial direction, the outer diameter side end surface of each roller and the second outer surface Wear of the abutting portion with the diameter side cylindrical portion is suppressed to a small extent, and the length of each roller can be increased while suppressing the dive of the roller into the cage, thereby realizing a high capacity. .

  Further, both end surfaces in the axial direction of each roller are spherical convex surfaces having a center of curvature on the central axis of each roller, and the outer surfaces of the respective rollers are displaced in a state where each roller is displaced outwardly in the radial direction of the cage. The center of the inner diameter side end surface of each roller in a state where the center portion of the diameter side end surface is in contact with the inner peripheral surface of the second outer diameter side cylindrical portion and each roller is displaced inward in the radial direction of the cage Since the portion and the outer peripheral surface of the second inner diameter side cylindrical portion abut, wear of the contact portion between the outer diameter side end surface of each roller and the inner peripheral surface of the second outer diameter side cylindrical portion can be more reliably suppressed. .

  Further, both radial end portions of the first through hole are on the outer diameter side of the inner peripheral surface of the second outer diameter side cylindrical portion and on the inner diameter side of the outer peripheral surface of the second inner diameter side cylindrical portion, respectively. Since both end portions in the radial direction of the second through hole are located in the second outer diameter side cylindrical portion and the second inner diameter side cylindrical portion beyond the second annular portion, the second outer diameter side The roller length can be sufficiently secured between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the second inner diameter side cylindrical portion, and a high capacity can be realized.

  The first and second cage elements further comprise a thrust trace comprising a race portion with which the plurality of rollers abut, and an outer cylindrical portion formed over the entire outer periphery of the race portion. Are coupled to each other by bending the distal end edge of the first inner diameter side cylindrical portion radially outward over the entire circumference, and the thrust trace partially bends the distal end portion of the outer cylindrical portion at a plurality of locations in the circumferential direction. As a result, since it has a locking portion that locks to the tip edge of the first outer diameter side cylindrical portion, the axial width of the bearing can be reduced even when a thrust trace of the outer diameter side guide is provided.

  The first and second cage elements further comprise a thrust trace comprising a race portion with which a plurality of rollers abut, and an inner cylindrical portion formed over the entire circumference of the inner periphery of the race portion. Are connected to each other by bending the tip edge of the first outer diameter side cylindrical portion radially inward over the entire circumference, and the thrust trace is partially formed at a plurality of locations in the circumferential direction at the tip portion of the inner cylinder portion. Since it has a locking portion that locks to the tip end edge of the first inner diameter side cylindrical portion by bending, it is possible to reduce the axial width of the bearing when a thrust trace of the inner diameter side guide is provided.

It is sectional drawing of the thrust roller bearing which concerns on 1st Embodiment of this invention. (A) is sectional drawing which shows the roller and holder | retainer of FIG. 1, (b) is the front view seen from the II direction of (a). It is sectional drawing of the thrust roller bearing which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the roller and holder | retainer of FIG. (A) is sectional drawing of the thrust roller bearing which concerns on the modification of this invention, (b) is sectional drawing of the thrust roller bearing which concerns on the other modification of this invention. It is sectional drawing which shows the conventional thrust roller bearing. It is sectional drawing which shows the other conventional thrust roller bearing.

  Hereinafter, each embodiment of the thrust roller bearing according to the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 shows a thrust roller bearing according to a first embodiment of the present invention. In this embodiment, the thrust roller bearing 1 includes a plurality of rollers 2 arranged in a radial direction, an annular retainer 3 having a plurality of pockets p that hold the plurality of rollers 2 in a freely rolling manner, and a plurality of rollers A pair of thrust traces 4 and 5 are provided to clamp the roller 2 from both sides in the axial direction.

  One thrust trace 4 includes an annular race portion 6 with which a plurality of rollers 2 abut, and an outer tube portion 7 formed on the outer peripheral edge of the race portion 6 over the entire circumference. The other thrust race 5 includes an annular race portion 8 with which a plurality of rollers 2 abut, and an inner cylinder portion 9 formed over the entire periphery of the inner periphery of the race portion 8. One thrust trace 4 has the back surface of the race portion 6 abutted against the facing surface 40 a of the first member 40, and the outer cylinder portion 7 is fitted to the holding portion 40 b that is a circular recess of the first member 40. Yes. The other thrust trace 5 has the back surface of the race portion 8 in contact with the opposing surface 41 a of the second member 41.

  Further, one thrust race 4 has a locking portion 7 a that locks the outer peripheral edge of the cage 3 by partially bending the distal end portion of the outer cylindrical portion 7 radially inward at a plurality of locations in the circumferential direction. Have. The other thrust race 5 has a locking portion 9 a that locks the inner peripheral edge of the retainer 3 by partially bending the distal end portion of the inner cylinder portion 9 radially outward at a plurality of locations in the circumferential direction. Thereby, the component parts of the thrust roller bearing 1 are coupled to each other so as not to be separated from each other.

  As shown in FIG. 2, the retainer 3 is configured by first and second retainer elements 11 and 12 that are each U-shaped in cross section and formed in a ring shape in the axial direction. The first retainer element 11 includes a first annular portion 14 provided with a plurality of radially extending rectangular first through holes 13 constituting the pocket p at a plurality of locations in the circumferential direction, and an inner portion of the first annular portion 14. A first inner diameter side cylindrical portion 15 formed on the peripheral edge and a first outer diameter side cylindrical portion 16 formed on the outer peripheral edge of the first annular portion 14 are provided. The second cage element 12 includes a second annular portion 19 having a plurality of radially extending rectangular second through holes 18 constituting the pocket p at a plurality of locations in the circumferential direction, and an inner portion of the second annular portion 19. A second inner diameter side cylindrical portion 20 formed on the peripheral edge and a second outer diameter side cylindrical portion 21 formed on the outer peripheral edge of the second annular portion 19 are provided. As long as these first and second cage elements 11 and 12 have wear resistance, they do not need to be as strong as the thrust trace. For example, after carbon steel is pressed, carbonitriding or Manufactured by nitriding.

  The first and second cage elements 11 and 12 are arranged on the inner diameter side of the first outer diameter side cylindrical portion 16 in a state where the first through holes 13 and the second through holes 18 are aligned with each other in the axial direction. The second outer diameter side cylindrical portion 21 is fitted inside, the second inner diameter side cylindrical portion 20 is fitted on the outer diameter side of the first inner diameter side cylindrical portion 15, and the tip end edge of the first inner diameter side cylindrical portion 15 is fully fitted. They are joined together by bending radially outward over the circumference. In addition, in this embodiment, the latching | locking part 7a of the outer cylinder part 7 of one thrust race 4 makes the outer periphery of the holder | retainer 3 the front-end edge 16a of the 1st outer diameter side cylindrical part 16 which is not bent. It is crimped.

  Both ends of the first through hole 13 in the radial direction are on the outer diameter side of the inner peripheral surface 21a of the second outer diameter side cylindrical portion 21 and on the inner diameter side of the outer peripheral surface 20a of the second inner diameter side cylindrical portion 20. Each is located. Further, both radial end portions of the second through hole 18 are located in the second outer diameter side cylindrical portion 21 and the second inner diameter side cylindrical portion 20 beyond the second annular portion 19. That is, the inner peripheral surface 21a of the second outer diameter side cylindrical portion 21 and the outer peripheral surface 20a of the second inner diameter side cylindrical portion 20 constitute a surface closest to the roller 2 in the radial direction.

  Each roller 2 has a spherical convex surface having a center of curvature on the central axis α of each roller 2 on the outer diameter side and inner diameter side end faces 30 and 31 which are both end faces in the axial direction. As for the end surfaces 30 and 31, each center part protrudes most in the axial direction.

  Therefore, in a state where each roller 2 is displaced outwardly in the radial direction of the cage 3, the center portion of the outer diameter side end surface 30 of each roller 2 and the inner peripheral surface 21 a of the second outer diameter side cylindrical portion 21 Are in contact with each other, and the center of the inner diameter side end face 31 of each roller 2 and the outer peripheral face 20a of the second inner diameter side cylindrical part 20 are in a state where each roller 2 is displaced inward in the radial direction of the cage 3. Abut.

  In the thrust roller bearing 1 configured as described above, the cage 3 can have high rigidity by being composed of the first and second cage elements 11 and 12. In addition, even when a force directed radially outward of the cage 3 is applied to each roller 2 based on centrifugal force during use, the center portion of the outer diameter side end face 30 of each roller 2 and the second outer diameter side Since the inner peripheral surface 21a of the cylindrical portion 21 abuts against and rubs, the PV value can be kept low. Thereby, the wear of the contact portion between the outer diameter side end surface 30 and the inner peripheral surface 21a of the second outer diameter side cylindrical portion 21 is suppressed to be small, and the penetration of the roller 2 into the cage 3 is suppressed. Further, the length of each roller 2 can be maximized between the inner peripheral surface 21a of the second outer diameter side cylindrical portion 21 and the outer peripheral surface 20a of the second inner diameter side cylindrical portion 20, thereby increasing the capacity. Can be secured.

(Second Embodiment)
3 and 4 show a thrust roller bearing according to a second embodiment of the present invention. Note that portions that are the same as or equivalent to those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

  In the thrust roller bearing 1a of the present embodiment, the retainer 3a has first and second retainer elements 11a and 12a each having a U-shaped cross section and formed in an annular shape as in the first embodiment. It is composed by overlapping. However, in the present embodiment, the first and second cage elements 11a and 12a are arranged on the first outer diameter side in a state where the first through holes 13 and the second through holes 18 are aligned with each other in the axial direction. In the state where the second outer diameter side cylindrical portion 21 is fitted on the inner diameter side of the cylindrical portion 16 and the second inner diameter side cylindrical portion 20 is fitted on the outer diameter side of the first inner diameter side cylindrical portion 15, the first outer The distal end edges of the radial-side cylindrical portion 16 are coupled to each other by being bent radially inward over the entire circumference. In the present embodiment, the locking portion 9a of the inner cylindrical portion 9 of the other thrust race 5 adds the outer peripheral edge of the cage 3a by the tip edge 15a of the first inner diameter side cylindrical portion 15 that is not bent. It is tightened.

Therefore, also in the case of the thrust roller bearing 1a of the present embodiment, the roller 2 is prevented from entering the cage 3, and high rigidity and high capacity can be realized.
Other configurations and operations are the same as those in the first embodiment.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
In the thrust roller bearing of the above-described embodiment, a pair of thrust traces 4 and 5 are provided, but one or both thrust traces 4 and 5 are omitted, and the opposing surface 40a of the first member 40, the first The opposing surface 41a of the second member 41 may be a track surface.

  Here, as shown in FIG. 5 (a), in the case of the thrust roller bearing 1b provided with only the outer diameter side guiding thrust trace 4 having the outer cylindrical portion 7, the first and second cage elements 11 are provided. , 12 use the retainer 3 that is coupled to each other by bending the distal end edge of the first inner diameter side cylindrical portion 15 radially outward over the entire circumference, and locking the outer cylindrical portion 7 of the thrust trace 4 The portion 7 a is engaged with the leading edge 16 a of the first outer diameter side cylindrical portion 16. Thereby, the axial direction length of the outer cylinder part 7 can be shortened, and the axial direction width | variety of the thrust roller bearing 1b can also be made small.

  Similarly, as shown in FIG. 5 (b), in the case of the thrust roller bearing 1c provided with only the inner diameter side guiding thrust trace 5 having the inner cylindrical portion 9, the first and second cage elements 11a, 12a uses the retainer 3a that is coupled to each other by bending the distal end edge of the first outer diameter side cylindrical portion 16 radially inward over the entire circumference, and locking the inner cylindrical portion 9 of the thrust trace 5 The portion 9 a is engaged with the leading edge 15 a of the first inner diameter side cylindrical portion 15. Thereby, the axial direction length of the inner cylinder part 9 can be shortened, and the axial direction width | variety of the thrust roller bearing 1c can also be made small.

  Further, in this embodiment, the roller 2 is used with the outer diameter side and inner diameter side end faces 30 and 31 as spherical convex surfaces, but a planar end face type roller is used with the outer diameter side and inner diameter side end faces 30 and 31 as planes. In this case, the effective roller length can be set longer without changing the cage dimensions, and the load capacity can be increased as compared with the above embodiment. In addition, the shape which has a recessed part in a center part may be sufficient as a plane end surface type roller.

1, 1a, 1b, 1c Thrust roller bearing 2 Roller 3, 3a Cage 4, 5 Thrust trace 6 Race part 7 Outer cylinder part 8 Race part 9 Inner cylinder part 13 First through hole 14 First annular part 15 First 1 inner diameter side cylindrical portion 16 first outer diameter side cylindrical portion 18 second through hole 19 second annular portion 20 second inner diameter side cylindrical portion 21 second outer diameter side cylindrical portion

Claims (5)

A thrust roller bearing comprising a plurality of rollers arranged in a radial direction, and an annular retainer having a plurality of pockets for holding the plurality of rollers in a freely rolling manner,
The cage is configured by overlapping first and second cage elements in the axial direction,
The first retainer element includes a first annular portion having a plurality of radially extending rectangular first through holes, which form the pockets, and a plurality of circumferential circumferential locations, and an inner peripheral edge of the first annular portion. A formed first inner diameter side cylindrical portion, and a first outer diameter side cylindrical portion formed on the outer peripheral edge of the first annular portion,
The second cage element includes a second annular portion having a plurality of radially extending rectangular through holes that form the pockets at a plurality of locations in the circumferential direction, and an inner peripheral edge of the second annular portion. A second inner diameter side cylindrical portion formed, and a second outer diameter side cylindrical portion formed on the outer peripheral edge of the second annular portion,
The first and second cage elements are arranged on the inner diameter side of the first outer diameter side cylindrical portion with the first through holes and the second through holes aligned with each other in the axial direction. While fitting the diameter side cylindrical portion, the second inner diameter side cylindrical portion is fitted on the outer diameter side of the first inner diameter side cylindrical portion,
In a state where the rollers are displaced to the outermost side in the radial direction of the cage, the outer diameter side end surface of the rollers and the inner peripheral surface of the second outer diameter side cylindrical portion are in contact with each other,
A thrust roller, wherein the inner diameter side end surface of each roller abuts the outer peripheral surface of the second inner diameter side cylindrical portion in a state where the rollers are displaced inward in the radial direction of the cage. bearing. Each axial end surface of each roller is a spherical convex surface having the center of curvature on the central axis of each roller,
In a state where the rollers are displaced to the outermost side in the radial direction of the cage, the center portion of the outer diameter side end surface of the rollers and the inner peripheral surface of the second outer diameter side cylindrical portion abut,
The center portion of the inner diameter side end surface of each roller and the outer peripheral surface of the second inner diameter side cylindrical portion are in contact with each roller in a state of being displaced inwardly in the radial direction of the cage. The thrust roller bearing according to claim 1. Both ends of the first through hole in the radial direction are positioned on the outer diameter side of the inner peripheral surface of the second outer diameter side cylindrical portion and on the inner diameter side of the outer peripheral surface of the second inner diameter side cylindrical portion, respectively. And
The both ends of the radial direction of the second through hole are respectively located in the second outer diameter side cylindrical portion and the second inner diameter side cylindrical portion beyond the second annular portion. Item 3. A thrust roller bearing according to Item 1 or 2. And further comprising a thrust race provided with a race portion with which the plurality of rollers abut, and an inner cylinder portion formed over the entire circumference of the inner periphery of the race portion,
The first and second cage elements are coupled to each other by bending the tip edge of the first outer diameter side cylindrical portion radially inward over the entire circumference;
The thrust race has a locking portion that is locked to a tip edge of the first inner diameter side cylindrical portion by partially bending the tip portion of the inner cylinder portion at a plurality of locations in the circumferential direction. The thrust roller bearing according to any one of claims 1 to 3. And further comprising a thrust race provided with a race part with which the plurality of rollers abut, and an outer cylinder part formed over the entire circumference of the outer peripheral edge of the race part,
The first and second cage elements are coupled to each other by bending the tip edge of the first inner diameter side cylindrical portion radially outward over the entire circumference,
The thrust trace has a locking portion that is locked to a leading edge of the first outer diameter side cylindrical portion by partially bending the distal end portion of the outer cylindrical portion at a plurality of locations in the circumferential direction. The thrust roller bearing according to any one of claims 1 to 3.

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