Roller with thrust retainer

Abstract

To provide a roller with a thrust retainer having a high lubrication performance.SOLUTION: A retainer 12 of a roller 10 with a thrust retainer has a first retaining member 13 and a second retaining member 14. The first retaining member 13 has a first outer annular body 21, an inner annular body 22, and plural first columns 23, and a space surrounded by the two adjacent first columns 23, the first outer annular body 21, and the inner annular body 22 is a first pocket 16. The second retaining member 14 has a second outer annular body 31, plural second columns 33 extending inward in the radial direction from the second outer annular body 31, and plural presser parts 32 extending from an inner radial end 34 of the second column 33, and a space surrounded by the two adjacent second columns 33 and the second inner annular body 31 is a second pocket 17. The retainer 12 has an opening 19 opened in the inner radial direction between the adjacent presser parts 32 on a second axial side of the inner annular body 22, and the opening 19 is coupled with the second pocket 17.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a thrust roller and cage assembly. [Background technology]

[0002] Patent Document 1 discloses a thrust roller and cage assembly. The thrust roller and cage assembly includes a plurality of rollers and a cage. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-2449 A Summary of the Invention [Problem to be solved by the invention]

[0004] Figure 8 is a cross-sectional view of a conventional thrust roller and cage assembly. A thrust roller and cage assembly 90 has a plurality of rollers 91 and a cage 92. The cage 92 has a first retaining member 93 on a first axial side (upper side in Figure 8) and a second retaining member 94 on a second axial side (lower side in Figure 8).

[0005] The first retaining member 93 has a first outer annular body 81 located on the radially outer side, a first inner annular body 82 located on the radially inner side, and a plurality of first pillars 83 connecting the first outer annular body 81 and the first inner annular body 82. A space surrounded by two first pillars 83 adjacent to each other in the circumferential direction of the retainer 92, the first outer annular body 81, and the first inner annular body 82 is a first pocket 95 that exposes a portion of the roller 91.

[0006] The second retaining member 94 has a second outer annular body 84 located on the radially outer side, a second inner annular body 85 located on the radially inner side, and a plurality of second pillars 86 connecting the second outer annular body 84 and the second inner annular body 85. The space surrounded by two second pillars 86, the second outer annular body 84, and the second inner annular body 85 adjacent to each other in the circumferential direction of the retainer 92 is a second pocket 96 that exposes a portion of the roller 91.

[0007] The first outer annular body 81 and the second outer annular body 84 are positioned so as to overlap and are in contact with each other in the radial direction. The first inner annular body 82 and the second inner annular body 85 are positioned so as to overlap and are in contact with each other in the radial direction. The cage 92 is a two-piece cage that combines a first retaining member 93 and a second retaining member 94. For this reason, the spatial volume for the passage of the lubricating oil inside the bearing is small, and there is a possibility that the oil permeability, which is the characteristic of whether the lubricating oil can easily pass between the radial inside and outside of the cage, may decrease.

[0008] The first outer annular body 81 and the second outer annular body 84 each have a circumferentially continuous ring shape, and the first inner annular body 82 and the second inner annular body 85 each have a circumferentially continuous ring shape. For this reason, for example, lubricating oil is less likely to infiltrate into the inside of the bearing from the central axis C side of the cage 92. A retainer 92 for retaining rollers 91 is provided between a first raceway member 98 on the first axial side and a second raceway member 99 on the second axial side. Inflow paths 89 for lubricant oil obtained between the retainer 92 and each of the first raceway member 98 and the second raceway member 99 are narrow. For this reason, it is difficult for the lubricant oil to pass through the inflow path 89 and to be supplied to at least one of the rolling and sliding contact between the rollers 91 and the first raceway member 98, the sliding contact between the retainer 92 and the first raceway member 98, the rolling and sliding contact between the rollers 91 and the second raceway member 99, and the sliding contact with the retainer 92.

[0009] For the above reasons, in the case of a two-blade cage, the locations of rolling and sliding contact and sliding contact tend to be poorly lubricated. In particular, if the lubricating oil has a low viscosity or the thrust roller and cage assembly rotates at a low speed, an environment is created in which it is difficult for an oil film to form in at least one of the locations of rolling and sliding contact between rollers 91 and first raceway member 98, sliding contact between cage 92 and first raceway member 98, rolling and sliding contact between rollers 91 and second raceway member 99, and sliding contact between cage 92 and second raceway member 99.

[0010] A thrust roller and cage assembly 90 may be used for grease lubrication. In the case of a conventional cage 92 shown in Fig. 8, it is difficult to seal grease inside the cage between a first retaining member 93 and a second retaining member 94. For this reason, a thrust roller and cage assembly that makes it easy to supply grease from the outside of the bearing to the inside of the bearing is desired.

[0011] SUMMARY OF THE PRESENT DISCLOSURE OF THE PRESENT DISCLOSURE AN OBJECT OF THE PRESENT DISCLOSURE ... [Means for solving the problem]

[0012] (1) A thrust roller and cage assembly of the present invention comprises a plurality of rollers and an annular cage, said cage having a first retaining member on a first axial side and a second retaining member on a second axial side, said first retaining member having a first outer annular body located on the radially outer side, an inner annular body located on the radially inner side, and a plurality of first pillars connecting said first outer annular body and said inner annular body, a space surrounded by two of said first pillars, said first outer annular body, and said inner annular body adjacent in the circumferential direction is a first pocket exposing a portion of said rollers, and said second retaining member has a second outer annular body located on the radially outer side, and a plurality of first pillars connecting said first outer annular body and said inner annular body. The retainer has a plurality of second pillars extending radially inward and a plurality of retaining portions extending from the radially inner ends of the second pillars to a first axial side, and a space surrounded by two circumferentially adjacent second pillars and the second outer annular body is a second pocket exposing a portion of the roller, the first outer annular body and the second outer annular body are in radial contact, and a portion of the retaining portions and a portion of the inner annular body are in radial contact, and the retainer has an opening that opens radially inward between the retaining portions adjacent to each other in the circumferential direction on the second axial side of the inner annular body, and the opening is connected to the second pocket.

[0013] In the thrust roller and cage assembly having the above-described configuration, the space between the pressing portions adjacent in the circumferential direction on the second axial side of the inner annular body serves as a supply path for a lubricant such as lubricating oil or grease. By supplying the lubricant from the supply path to the inside of the bearing, a thrust roller and cage assembly with high lubrication performance can be obtained.

[0014] (2) Preferably, the pressing portion has a boundary portion with the second pillar, and a width dimension of the boundary portion along the circumferential direction is smaller than a width dimension of the second pillar along the circumferential direction. According to the above-mentioned configuration, a gap is provided between the roller and the pressing portion, and the lubricant is easily supplied to the inside of the bearing through the gap.

[0015] (3) Preferably, a first width dimension of the first pocket in a direction perpendicular to the radial direction is smaller than a diameter of the roller, and a second width dimension of the second pocket in a direction perpendicular to the radial direction is smaller than the diameter of the roller and larger than the first width dimension. According to the above configuration, when the thrust roller and cage assembly rotates and the rollers rotate on their axes, the rollers come into contact with the first pillars that form the first pocket. In contrast, the rollers do not come into contact with the second pillars that form the second pocket. This makes it possible to reduce oil film breakdown on the roller surfaces due to contact between the rollers and the cage.

[0016] (4) In the thrust roller and cage assembly of (2), preferably, the pressing portion has a tip end on a first axial side, and a width dimension of the pressing portion along the circumferential direction gradually decreases from the boundary portion toward the tip end. According to this configuration, a larger gap can be obtained between the roller and the pressing portion. Effect of the Invention

[0017] According to the present invention, a thrust roller and cage assembly having a supply path for a lubricant such as lubricating oil or grease and having high lubricating performance can be obtained. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a plan view showing an example of a thrust roller and cage assembly. [Diagram 2] FIG. 2 is a cross-sectional view taken along the line II in FIG. [Diagram 3] FIG. 3 is a cross-sectional view taken along the line III in FIG. [Figure 4] FIG. 4 is an explanatory diagram of the cage that holds the rollers, as viewed from the radial inside. [Diagram 5] FIG. 5 is an explanatory diagram of an annular plate-shaped member before plastic deformation. [Figure 6] FIG. 6 is an explanatory diagram of an annular plate-shaped member before plastic deformation. [Figure 7] FIG. 7 is a cross-sectional view taken along the line VI in FIG. [Figure 8] FIG. 8 is a cross-sectional view of a conventional thrust roller and cage assembly. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] [Thrust roller and cage assembly] Fig. 1 is a plan view showing an example of a thrust roller and cage assembly. Fig. 2 is a cross-sectional view taken along the line II in Fig. 1. Fig. 3 is a cross-sectional view taken along the line III in Fig. 1. The thrust roller and cage assembly 10 has a plurality of rollers 11 and an annular cage 12 that holds the plurality of rollers 11.

[0020] The directions of the thrust roller and cage assembly 10 are defined below. The direction along the central axis C of the thrust roller and cage assembly 10 and the direction parallel to the central axis C are defined as the "axial direction". The direction perpendicular to the central axis C is defined as the "radial direction". The direction along a circle centered on the central axis C is defined as the "circumferential direction".

[0021] The thrust roller and cage assembly 10 (see Figs. 2 and 3) is disposed between a first raceway member 7 on a first axial side and a second raceway member 8 on a second axial side which rotate relatively about a central axis C. The thrust roller and cage assembly 10 supports an axial load acting between the first raceway member 7 and the second raceway member 8. The first raceway member 7 in this embodiment is one of a shaft raceway member and a housing raceway member, and the second raceway member 8 is the other of the shaft raceway member and the housing raceway member.

[0022] In the following description, the first axial side will be referred to as the "upper side" and the second axial side as the "lower side" as shown in Figures 2 and 3. Each figure shows a state in which the central axis of the cage 12 coincides with the central axis C of the thrust roller and cage assembly 10. Below, each configuration of the thrust roller and cage assembly 10 in this state will be described. Figure 4 is an explanatory diagram of the cage 12 that holds the rollers 11, viewed from the radial inside.

[0023] The retainer 12 has an upper first retaining member 13 and a lower second retaining member 14. As will be described later, each of the first retaining member 13 and the second retaining member 14 is manufactured by plastically deforming a circular plate-shaped metal member.

[0024] The first retaining member 13 has one first outer annular body 21, one inner annular body 22, and a plurality of first pillars 23. The first outer annular body 21 is located radially outward from the plurality of first pillars 23. The inner annular body 22 is located radially inward from the plurality of first pillars 23. The first outer annular body 21 and the inner annular body 22 each have a circumferentially continuous annular shape (cylindrical shape). The first pillar 23 has a shape that is elongated in the radial direction. The first pillar 23 connects the first outer annular body 21 and the inner annular body 22.

[0025] The space surrounded on all four sides by the first outer annular body 21, the inner annular body 22, and the two circumferentially adjacent first pillars 23 is the first pocket 16. A portion of the roller 11 is exposed from the first pocket 16.

[0026] The second retaining member 14 has one second outer annular body 31, a plurality of second pillars 33, and a plurality of pressing portions 32. The second outer annular body 31 is located radially outward of the plurality of second pillars 33. The second outer annular body 31 has a circumferentially continuous ring shape (cylindrical shape). The second pillar 33 is a portion extending radially inward from the second outer annular body 31, and has a shape elongated in the radial direction. The pressing portion 32 (see Figures 3 and 4) is a protruding piece extending upward from a radially inner end portion 34 of the second pillar 33.

[0027] The space surrounded on three sides by the second outer annular body 31 and the two circumferentially adjacent second pillars 33 is the second pocket 17. A portion of the roller 11 is exposed from the second pocket 17.

[0028] 4, the inner annular body 22 has a ring shape that is continuous in the circumferential direction. The pressing portions 32 are discontinuous in the circumferential direction. Each pressing portion 32 is continuous with one second pillar 33, and is provided intermittently along the circumferential direction, similar to the second pillars 33. The inner annular body 22 is axially shorter than the first outer annular body 21 (see FIG. 3), and covers an upper part 37 of the pressing portion 32 .

[0029] The upper part 37 of the pressing portion 32 and the inner annular body 22 overlap in the radial direction, and as shown in Fig. 3, the upper part 37 of the pressing portion 32 and a part of the inner annular body 22 are in contact with each other in the radial direction. The upper part 37 of the pressing portion 32 is in intermittent contact with the inner annular body 22 in the circumferential direction. The upper part 37 of the pressing portion 32 and the inner annular body 22 are brought into contact with each other by a crimping process described later. In this embodiment, the upper part 37 of the pressing portion 32 is located radially outward of the inner annular body 22.

[0030] 2 and 3, the first outer annular body 21 and the second outer annular body 31 overlap each other in the radial direction, and are in contact with each other in the radial direction. The first outer annular body 21 and the second outer annular body 31 are in contact with each other over the entire circumference. The first outer annular body 21 and the second outer annular body 31 are brought into contact with each other by a crimping process described later. In this embodiment, the first outer annular body 21 is located radially outside the second outer annular body 31.

[0031] As described above, each of the first holding member 13 and the second holding member 14 has a bent shape as shown in Figs. 2 and 3, formed by plastically deforming annular plate-like members. Fig. 5 is an explanatory diagram of annular plate-like member 27 before plastic deformation. This annular plate-like member 27 becomes second holding member 14 after processing. An outer peripheral portion 27a of annular plate-like member 27 is plastically deformed, and the outer peripheral portion 27a becomes second outer annular body 31 (see Figs. 2 and 3). In Fig. 5, the boundary between outer peripheral portion 27a, which will become second outer annular body 31 after processing, and portion 27b, which will become second pillar 33 after processing, is indicated by a two-dot chain line.

[0032] Inner periphery 27c of annular plate-like member 27 is plastically deformed, and inner periphery 27c becomes pressing portion 32 (see Figs. 3 and 4). In Fig. 5, the boundary between inner periphery 27c, which will become pressing portion 32 after processing, and portion 27b, which will become second pillar 33 after processing, is indicated by a two-dot chain line. Annular plate-like member 27 has inner periphery 27c, which will become pressing portion 32 after processing, intermittently arranged along the circumferential direction.

[0033] Fig. 6 is an explanatory diagram of an annular, plate-like member 28 before plastic deformation. This annular, plate-like member 28 becomes the first holding member 13 after processing. An outer peripheral portion 28a of the annular, plate-like member 28 is plastically deformed, and the outer peripheral portion 28a becomes the first outer annular body 21 (see Figs. 2 and 3). In Fig. 6, the boundary between the outer peripheral portion 28a that will become the first outer annular body 21 after processing and a portion 28b that will become the first pillar 23 after processing is indicated by a two-dot chain line.

[0034] An inner peripheral portion 28c of the annular, plate-like member 28 is plastically deformed, and the inner peripheral portion 28c becomes the inner annular body 22 (see Figs. 3 and 4). In Fig. 6, the boundary between the inner peripheral portion 28c, which will become the inner annular body 22 after processing, and the portion 28b, which will become the first pillar 23 after processing, is indicated by a two-dot chain line. The annular, plate-like member 28 has an inner peripheral portion 28c, which will become the inner annular body 22 after processing, that is annular along the circumferential direction.

[0035] A method for manufacturing the thrust roller and cage assembly 10 will now be described. The first retaining member 13 is placed on the second retaining member 14 obtained by plastic deformation as described above, and on the plurality of rollers 11 located in the second pocket 17 of the second retaining member 14. The first outer annular body 21 is located radially outward of the second outer annular body 31. The inner annular body 22 is located radially inward of the pressing portion 32. The inner annular body 22 is press-fitted into the pressing portion 32. In this state, the edge of the outer circumferential portion of the first retaining member 13 is plastically deformed into an annular shape by crimping. As a result of the plastic deformation caused by this crimping, the first retaining member 13 and the second retaining member 14 become one body. In this manner, the thrust roller and cage assembly 10 is manufactured.

[0036] As shown in FIG. 4, the cage 12 in which the first holding member 13 and the second holding member 14 are integrated is located below the inner annular body 22 and has an opening 19 between two pressing portions 32 adjacent to each other in the circumferential direction. The opening 19 opens toward the radially inner side. The opening 19 is connected to the second pocket 17.

[0037] FIG. 7 is a cross-sectional view taken along the arrow VI in FIG. 1. One first column 23 and one second column 33 are located at the same position in the circumferential direction. The first pocket 16 and the second pocket 17 are located at the same position in the circumferential direction. One first pocket 16 and one second pocket 17 located at the same position in the circumferential direction constitute one pocket 15 for holding the roller 11.

[0038] The first width dimension W1 in the direction orthogonal to the radial direction of the first pocket 16 is smaller than the diameter D of the roller 11 (W1 < D). That is, the cage 12 has a portion where the interval (W1) between two adjacent first columns 23 in the circumferential direction is smaller than the diameter D of the roller 11. The second width dimension W2 in the direction orthogonal to the radial direction of the second pocket 17 is smaller than the diameter D of the roller 11 (W2 < D). That is, the cage 12 has a portion where the interval (W2) between two adjacent second columns 33 in the circumferential direction is smaller than the diameter D of the roller 11. With this configuration (W1 < D, W2 < D), the roller 11 does not drop off axially from the pocket 15 to the cage 12.

[0039] In the case of this embodiment (see FIG. 7), the second width dimension W2 is larger than the first width dimension W1 (W2 > W1). When the roller 10 with a thrust cage rotates about the central axis C, the roller 11 is substantially guided by the first pocket 16 and revolves about the central axis C.

[0040] As shown in FIGS. 3 and 4, the pressing portion 32 is a protruding piece that is bent from the inner end portion 34 in the radial direction of the second column 33 and extends upward. The pressing portion 32 has a boundary portion 35 with the second column 33. The boundary portion 35 corresponds to the portion of the pressing portion 32 that is bent from the second column 33. As shown in FIG. 4, the width dimension B1 along the circumferential direction (tangential direction) of the boundary portion 35 is smaller than the width dimension B2 along the circumferential direction (tangential direction) of the second column 33 (B1 < B2). The width dimension B2 is the dimension along the circumferential direction (tangential direction) at the inner end portion in the radial direction of the second column 33.

[0041] The pressing portion 32 has a tip portion 36 on the upper side. The width dimension B along the circumferential direction (tangential direction) of the pressing portion 32 gradually decreases from the boundary portion 35 toward the tip portion 36. In the case of this embodiment, the shape of the pressing portion 32 is trapezoidal when viewed from the inner side in the radial direction.

[0042] 〔Thrust bearing 10 with cage of this embodiment〕 As described above, the thrust bearing 10 with cage of this embodiment has a plurality of rollers 11 and an annular cage 12. The cage 12 has an upper first holding member 13 and a lower second holding member 14.

[0043] The first holding member 13 has a first outer annular body 21 located on the outer side in the radial direction, an inner annular body 22 located on the inner side in the radial direction, and a plurality of first columns 23. The plurality of first columns 23 connect the first outer annular body 21 and the inner annular body 22. The space surrounded by two adjacent first columns 23, the first outer annular body 21, and the inner annular body 22 in the circumferential direction is a first pocket 16 that exposes a part of the roller 11.

[0044] The second holding member 14 has a second outer annular body 31 located on the outer side in the radial direction, a plurality of second columns 33, and a plurality of pressing portions 32. The second column 33 is a portion that extends radially inward from the second outer annular body 31. The pressing portion 32 is a portion that extends upward from the inner end portion 34 in the radial direction of the second column 33. The space surrounded by two adjacent second columns 33 and the second outer annular body 31 in the circumferential direction is a second pocket 17 that exposes a part of the roller 11.

[0045] The first outer annular body 21 and the second outer annular body 31 are in contact with each other in the radial direction. A portion 37 of the pressing portion 32 and a portion of the inner annular body 22 are in contact with each other in the radial direction. The retainer 12 has an opening 19 that opens radially inward between two circumferentially adjacent pressing portions 32 below the inner annular body 22. The opening 19 is connected to the second pocket 17.

[0046] According to the thrust roller and cage assembly 10 having the above-described configuration, the opening 19 located on the lower side of the inner annular body 22 and between two circumferentially adjacent pressing portions 32 serves as a supply path for a lubricant such as lubricating oil or grease. In this embodiment, lubricating oil is used as the lubricant. The lubricating oil can enter the inside of the cage between the first retaining member 13 and the second retaining member 14, where the rollers 11 are present, through the openings 19. Lubricating oil is supplied from opening 19 into the inside of the cage, where it adheres to the surfaces of rollers 11 inside the cage, and is discharged from first pocket 16, where it is supplied to the rolling and sliding contact between rollers 11 and first raceway member 7, and to the sliding contact between cage 12 and first raceway member 7. Lubricating oil is supplied from opening 19 into the inside of the bearing cage, where it adheres to the surfaces of rollers 11 inside the cage, and is discharged from second pocket 17, where it is supplied to the rolling and sliding contact between rollers 11 and second raceway member 8, and to the sliding contact between cage 12 and second raceway member 8. The provision of opening 19 makes it possible to obtain a thrust roller and cage assembly 10 with high lubrication performance.

[0047] The cage 12 of this embodiment is a two-piece cage that combines a first retaining member 13 and a second retaining member 14. A two-piece cage has higher strength and can have a higher capacity than a cage made of a single retaining member. That is, in this embodiment, the cage 12 can retain a large number of rollers 11.

[0048] The roller 10 with a thrust retainer according to this embodiment is used in various devices. For example, it is used in a multi-stage transmission of an automobile. In this application, the roller 10 with a thrust retainer requires a high capacity. On the other hand, for the low fuel consumption of the automobile, the viscosity of the lubricating oil is reduced, and it is difficult to form an oil film between the roller 11, the retainer 12, the first raceway member 7, and the second raceway member 8. However, the retainer 12 of this embodiment can introduce lubricating oil into the retainer from the opening 19, making it easy to form an oil film between the roller 11, the retainer 12, the first raceway member 7, and the second raceway member 8, thus improving the lubrication performance.

[0049] Further, the roller 10 with a thrust retainer according to this embodiment is used in an actuator for an electric brake of an automobile. In this application, the roller 10 with a thrust retainer requires a high capacity, and furthermore, grease may be used as a lubricant. Moreover, the operation of the roller 10 with a thrust retainer is a rocking motion at an extremely low speed. For this reason, it is difficult to form an oil film on the roller 11. However, the retainer 12 of this embodiment can enclose a large amount of grease from the opening 19, making it easy to supply grease for the rolling and sliding contact between the roller 11 and the first raceway member 7, the sliding contact between the retainer 12 and the first raceway member 7, the rolling and sliding contact between the roller 11 and the second raceway member 8, and the sliding contact between the retainer 12 and the second raceway member 8, thus improving the lubrication performance.

[0050] As described above, grease may be adopted as the lubricant for the roller 10 with a thrust retainer according to this embodiment. In this case, the completed retainer 12 is a two-piece retainer as described above, and grease can be supplied to the retainer 12 through the opening 19, making the manufacturing easy.

[0051] In the case of this embodiment, as shown in FIG. 4, the width dimension B1 along the circumferential direction of the boundary portion 35 between the pressing portion 32 and the second column 33 is smaller than the width dimension B2 along the circumferential direction of the second column 33 (B1 < B2). Due to the relationship of B1 < B2, when the roller 10 with a thrust retainer is viewed from the inner circumferential side, a gap e is provided between the roller 11 and the pressing portion 32. The lubricating oil is easily supplied into the bearing through the gap e. Due to the relationship where the aforementioned B1 < B2, when the second holding member 14 is molded, it is easy to bend between the second pillar 33 and the pressing portion 32. That is, along the boundary indicated by the dashed two-dot line in FIG. 5, it is easy to bend between the portion 27b that becomes the second pillar 33 and the inner peripheral portion 27c that becomes the pressing portion 32, so the workability is good.

[0052] Furthermore, in the case of this embodiment (see FIG. 4), the width dimension B along the circumferential direction of the pressing portion 32 gradually decreases from the boundary portion 35 toward the tip portion 36. With this configuration, the gap e obtained between the roller 11 and the pressing portion 32 becomes larger.

[0053] As shown in FIG. 7, the first width dimension W1 of the first pocket 16 is smaller than the diameter D of the roller 11. The second width dimension W2 of the second pocket 17 is smaller than the diameter D of the roller 11 and larger than the first width dimension W1. Since the second width dimension W2 of the second pocket 17 is larger than the first width dimension W1 of the first pocket 16, when the roller 10 with a thrust retainer rotates and the roller 11 rotates, the roller 11 contacts the first pillar 23 that constitutes the first pocket 16. On the other hand, the roller 11 does not contact the second pillar 33 that constitutes the second pocket 17. It becomes possible to reduce the breakage of the oil film on the surface of the roller due to the contact between the roller 11 and the retainer 12.

[0054] [Others] The embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the rights of the present invention is not limited to the above-described embodiments, but includes all modifications within the scope equivalent to the configuration described in the claims.

Explanation of Reference Numerals

[0055] 10 Roller with Thrust Retainer 11 Roller 12 Retainer 13 First Holding Member 14 Second Holding Member 16 First Pocket 17 Second Pocket 19 Opening 21 First outer annular body 22 Inner Annulus 23 Pillar 1 31 Second outer annular body 32 Clamp 33 Pillar 2 34 End 35 Boundary 36 Tip 37 part W1 First width dimension W2 Second width dimension B Width dimension B1 Width dimension B2 Width dimension D Roller diameter

Claims

1. The bearing has a plurality of rollers and an annular cage, The cage has a first retaining member on a first axial side and a second retaining member on a second axial side, The first retaining member is a first outer annular body located radially outward, an inner annular body located radially inward, and a plurality of first pillars connecting the first outer annular body and the inner annular body; a space surrounded by two of the first pillars adjacent to each other in the circumferential direction, the first outer annular body, and the inner annular body is a first pocket that exposes a portion of the roller, The second holding member is a second outer annular body located radially outward; a plurality of second pillars extending radially inward from the second outer annular body; and a plurality of pressing portions extending from radially inner ends of the second pillars to a first axial direction side, a space surrounded by two of the second pillars adjacent to each other in the circumferential direction and the second outer annular body is a second pocket that exposes a portion of the roller, the first outer annular body and the second outer annular body are in radial contact with each other, A portion of the pressing portion and a portion of the inner annular body are in radial contact with each other, the retainer has an opening portion that opens radially inward between the pressing portions adjacent to each other in the circumferential direction on a second axial side of the inner annular body, and the opening portion is connected to the second pocket. Thrust roller and cage assembly.

2. The holding portion has a boundary portion with the second pillar, The width dimension of the boundary portion along the circumferential direction is smaller than the width dimension of the second pillar along the circumferential direction.

2. The thrust roller and cage assembly according to claim 1.

3. The first pocket has a first width dimension in a direction perpendicular to the radial direction that is smaller than a diameter of the roller, A second width dimension of the second pocket in a direction perpendicular to the radial direction is smaller than a diameter of the roller and larger than the first width dimension.

3. The thrust roller and cage assembly according to claim 1 or 2.

4. The pressing portion has a tip portion on a first axial side, A width dimension of the pressing portion along a circumferential direction gradually decreases from the boundary portion toward the tip portion.

3. The thrust roller and cage assembly according to claim 2.

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