Retainer for a thrust bearing and thrust bearing

Abstract

A cage (1, 1') for a thrust bearing includes a radially inner inner bead (11, 11'), a radially outer outer bead (12, 12'), and an intermediate portion (13, 13') therebetween. The intermediate portion (13, 13') forms a plurality of pockets for mounting rolling elements (2) of the thrust bearing. At least one of the inner bead (11, 11') and the outer bead (12, 12') is formed with a notch portion (1C, 1C') that penetrates in an axial direction (A) of the cage (1, 1') and changes a radial dimension of the cage (1, 1'). A thrust bearing including the above-described cage (1, 1') improves an amount of lubricating oil that enters and exits the thrust bearing when the thrust bearing is in operation.

Description

Technical Field

[0001] This application relates to the field of bearings, and particularly to a cage for a thrust bearing and a thrust bearing including the cage. Background Technology

[0002] like Figure 1A As shown, in some typical applications of thrust bearings (such as when thrust bearings are used in gearboxes), the lubrication requirements for thrust bearings are becoming increasingly stringent due to the continuously increasing relative rotational speed between the shaft S and the housing H.

[0003] like Figure 1A and Figure 1B As shown, the thrust bearing includes a cage 10, rolling elements 20, a shaft ring 30, and a housing ring 40. The rolling elements 20 are typically needle rollers, while the shaft ring 30 and housing ring 40 can also be referred to as stamped kerf plates or thrust washers. To improve the lubrication performance of the thrust bearing, oil grooves are usually added to the shaft ring 30 and / or housing ring 40. Figure 1B This illustrates a scheme where a notch 30C is formed in the shaft ring 30 to serve as an oil groove, thereby improving the lubrication performance of the thrust bearing. When the above scheme is adopted, as... Figure 1B As shown, lubricating oil enters and exits the bearing through the gaps between the inner rolled edge of the cage 10 and the shaft ring 30, and between the outer rolled edge of the cage 10 and the shaft ring 30. Due to the structure and installation direction of the cage 10, although a notch 30C is formed in the shaft ring 30, there is still a large overlap between the shaft ring 30 and the inner rolled edge of the cage 10 in the axial direction A. Therefore, there is still a gap between the shaft ring 30 and the inner rolled edge of the cage 10 with a long axial dimension and a very small radial dimension. As a result, the amount of lubricating oil entering and exiting the bearing through this gap is still relatively small. Thus, when the relative rotational speed between the shaft S and the housing H is high, the amount of lubricating oil entering and exiting the bearing using the above solution is insufficient, which can easily lead to premature bearing failure. Moreover, when more lubricating oil needs to flow through the thrust bearing to provide lubrication for surrounding components, the amount of lubricating oil entering and exiting the bearing using the above solution is also insufficient. Summary of the Invention

[0004] The purpose of this application is to overcome or at least mitigate the shortcomings of the prior art described above, and to provide a novel thrust bearing cage that can increase the amount of lubricating oil entering and exiting the thrust bearing during operation. A thrust bearing including the aforementioned thrust bearing cage is also provided, which has the same effect.

[0005] To achieve the above objectives, the present application may adopt the following technical solutions.

[0006] This application provides a thrust bearing cage that is formed in an annular shape, the cage including an inner rolled edge on the radially inner side, an outer rolled edge on the radially outer side, and a middle portion between the two, the middle portion forming a plurality of pockets for mounting the rolling elements of the thrust bearing, the plurality of pockets being evenly distributed at intervals in the circumferential direction of the cage, and at least one of the inner rolled edge and the outer rolled edge forming a notch that passes through the axial direction of the cage and causes the radial dimension of the cage to change.

[0007] In one alternative embodiment, the inward rolled edge includes a first bend, a first connecting portion, and a first fold-back portion that are sequentially connected. The first bend and the first fold-back portion extend along the axial direction of the retainer, and the first fold-back portion is located radially inside the first bend.

[0008] The notch is formed in the first connecting portion and / or the first fold-back portion.

[0009] In another alternative embodiment, the first connecting portion extends at least partially along the radial direction.

[0010] In another alternative embodiment, the outward rolled edge includes a second bend, a second connecting portion, and a second fold-back portion that are sequentially connected, the second bend and the second fold-back portion extending along the axial direction of the cage, with the second fold-back portion located radially outward of the second bend.

[0011] The notch is formed in the second connecting portion and / or the second folding portion.

[0012] In another alternative embodiment, the second connection portion extends at least partially along the radial direction.

[0013] In another alternative embodiment, the cage is formed with a plurality of said notches, which are evenly distributed in the circumferential direction.

[0014] This application also provides a thrust bearing comprising a plurality of rolling elements, a shaft ring, a housing ring, and a thrust bearing cage as described in any of the above technical solutions, wherein the plurality of rolling elements are mounted in pockets of the cage and held by the cage between the shaft ring and the housing ring.

[0015] In an alternative embodiment, the inwardly rolled edge forms the notch, and the radial dimension of the retainer at the notch is smaller than the radial dimension of the retainer at other parts.

[0016] In another alternative embodiment, the outer rolled edge forms the notch, and the radial dimension of the retainer at the notch is smaller than the radial dimension of the retainer at other parts.

[0017] In another alternative embodiment, a first opening facing one axial direction and a second opening facing the other axial direction are formed between the shaft ring and the seat ring. The first opening is opposite to the inward rolled edge, and the second opening is opposite to the outward rolled edge.

[0018] Both the inward rolled edge and the outward rolled edge extend from the middle portion toward one side of the axial direction, with the outward rolled edge forming the notch portion; or both the inward rolled edge and the outward rolled edge extend from the middle portion toward the other side of the axial direction, with the inward rolled edge forming the notch portion.

[0019] By adopting the above technical solution, this application provides a novel cage for thrust bearings and a thrust bearing. The cage is integrally formed in an annular shape. The cage includes an inner rolled edge on the radially inner side, an outer rolled edge on the radially outer side, and a middle portion between the two. The middle portion forms a plurality of pockets for mounting the rolling elements of the thrust bearing, and the plurality of pockets are evenly distributed at intervals in the circumferential direction of the cage. Further, at least one of the inner rolled edge and the outer rolled edge is formed with a notch that extends through the axial direction of the cage and changes the radial dimension of the cage. By adopting the above solution, since a notch is provided on at least one of the inner rolled edge and the outer rolled edge, the radial clearance between the inner rolled edge and the bearing race and / or the radial clearance between the outer rolled edge and the bearing race is increased at the location where the notch is provided, thereby increasing the amount of lubricating oil entering and exiting the thrust bearing when the thrust bearing using this cage is in operation. Attached Figure Description

[0020] Figure 1A This is a partial cross-sectional schematic diagram showing a device that uses a thrust bearing.

[0021] Figure 1B It shows Figure 1A A partial cross-sectional view of the thrust bearing in the diagram.

[0022] Figure 2A This is a schematic diagram showing a partial structure of a thrust bearing according to a first embodiment of the present application, which shows a cage and rolling elements.

[0023] Figure 2B It shows Figure 2A An enlarged schematic diagram of a local structure.

[0024] Figure 2C This is a partial cross-sectional schematic diagram showing a thrust bearing according to a first embodiment of this application.

[0025] Figure 3 This is a partial cross-sectional schematic diagram showing a thrust bearing according to a second embodiment of the present application.

[0026] Figure 4AThis is a schematic diagram showing a partial structure of a thrust bearing according to a third embodiment of the present application, which shows a cage and rolling elements.

[0027] Figure 4B It shows Figure 4A An enlarged schematic diagram of a local structure.

[0028] Figure 4C This is a partial cross-sectional schematic diagram showing a thrust bearing according to a third embodiment of the present application.

[0029] Figure 5 This is a partial cross-sectional schematic diagram showing a thrust bearing according to a fourth embodiment of this application.

[0030] Explanation of reference numerals in the attached figures

[0031] 10 Cage 20 Rolling Elements 30 Shaft Ring 30C Notch 40 Seat Ring S Shaft H Housing

[0032] 1' Cage 1C' Notch 11' 11' Inward Rolled Edge 111' 111' First Bend 112' 112' First Connecting Part 112R' First Radial Part 113' 113' First Fold-Back Part 12' 12' Outward Rolled Edge 121' 121' Second Bend 122' 122' Second Connecting Part 122R' Second Radial Part 123' 123' Second Fold-Back Part 13' Middle Part

[0033] 2 Rolling element 3 Shaft ring 31 Shaft ring axial portion 32 Shaft ring radial portion 4 Seat ring 41 Seat ring axial portion 42 Seat ring radial portion 51 First opening 52 Second opening

[0034] A is axial, R is radial, and C is circumferential. Detailed Implementation

[0035] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaustively describe all possible methods of this application, nor to limit the scope of this application.

[0036] It should be noted that, unless otherwise specified, in this application, "axial," "radial," and "circumferential" refer to the axial, radial, and circumferential directions of the thrust bearing (cage), respectively, where "one side of the axial direction" refers to... Figure 2C , Figure 3 , Figure 4C and Figure 5 The right side of the axis, "the other side of the axis" refers to Figure 2C , Figure 3 , Figure 4C and Figure 5 On the left side of the middle.

[0037] The structure of the thrust bearing according to the first embodiment of this application will be described below with reference to the accompanying drawings.

[0038] (Structure of the thrust bearing according to the first embodiment of this application)

[0039] like Figures 2A to 2C As shown, the thrust bearing according to the first embodiment of this application includes a cage 1, a plurality of rolling elements 2, a shaft ring 3 and a seat ring 4. The rolling elements 2 are mounted in the pockets of the cage 1 and held by the cage 1 between the shaft ring 3 and the seat ring 4.

[0040] In this embodiment, as Figures 2A to 2C As shown, the retainer 1 is formed in a circular shape. The retainer 1 includes an inner rolled edge 11, an outer rolled edge 12, and a middle portion 13, all of which are also circular in shape. In this embodiment, the inner rolled edge 11, the outer rolled edge 12, and the middle portion 13 are formed as a single unit.

[0041] Specifically, such as Figure 2A and Figure 2B As shown, in the radial direction R, the middle portion 13 is located between the inner rolled edge 11 and the outer rolled edge 12, and the middle portion 13 is formed into a bulging shape by bending. The middle portion 13 forms a plurality of pockets for mounting the rolling element 2. The plurality of pockets are evenly distributed at intervals in the circumferential direction C.

[0042] like Figures 2A to 2C As shown, the inwardly rolled edge 11 is located radially inside the middle portion 13. The outer periphery of the inwardly rolled edge 11 is connected to the inner periphery of the middle portion 13, and the inwardly rolled edge 11 extends from the middle portion 13 toward the other side of the axial direction. The inwardly rolled edge 11 includes a first bent portion 111, a first connecting portion 112, and a first folded-back portion 113, which are integrally formed and sequentially connected. The first bent portion 111 is connected to the middle portion 13 and extends from the inner periphery of the middle portion 13 along the axial direction A toward the other side of the axial direction to the first connecting portion 112. The first connecting portion 112 bends 180 degrees from the first bent portion 111 and then connects to the first folded-back portion 113. The first folded-back portion 113 extends from the first connecting portion 112 along the axial direction A toward one side of the axial direction. The first folded-back portion 113 is located radially inside the first bent portion 111, and the first folded-back portion 113 and the first bent portion 111 overlap in the axial direction A.

[0043] like Figures 2A to 2CAs shown, the outer rolled edge 12 is located radially outside the middle portion 13. The inner periphery of the outer rolled edge 12 is connected to the outer periphery of the middle portion 13, and the outer rolled edge 12 extends from the middle portion 13 towards the other side of the axial direction. The outer rolled edge 12 includes a second bent portion 121, a second connecting portion 122, and a second folded-back portion 123, which are integrally formed and sequentially connected. The second bent portion 121 is connected to the middle portion 13 and extends from the outer periphery of the middle portion 13 along the axial direction A towards the other side of the axial direction to the second connecting portion 122. The second connecting portion 122 bends 180 degrees from the second bent portion 121 and then connects to the second folded-back portion 123. The second folded-back portion 123 extends from the second connecting portion 122 along the axial direction A towards one side of the axial direction. The second folded-back portion 123 is located radially outside the second bent portion 121, and the second folded-back portion 123 and the second bent portion 121 overlap in the axial direction A.

[0044] Understandable, Figure 2C In this configuration, the seat ring 4 is located on one axial side of the shaft ring 3, and the shaft ring 3 is located on the other axial side of the seat ring 4. Here, "one axial side" can also be described as the side where the seat ring is located, and "the other axial side" can also be described as the side where the shaft ring is located. Figure 2C In the middle, the inner rolled edge 11 and the outer rolled edge 12 extend or extend toward the side where the shaft ring is located.

[0045] In this embodiment, as Figures 2A to 2C As shown, the rolling element 2 is a cylindrical needle roller. A portion of the rolling element 2 is housed in a pocket of the cage 1 and is restrained by the cage 1.

[0046] In this embodiment, as Figure 2C As shown, the shaft ring 3 is integrally formed into an annular shape. The shaft ring 3 includes an integrally formed axial portion 31 and radial portion 32. The axial portion 31 extends from the inner periphery of the radial portion 32 along the axial direction A toward one side of the axial direction, and the radial portion 32 extends from the axial portion 31 along the radial direction R toward the radial direction outward.

[0047] In this embodiment, as Figure 2C As shown, the seat ring 4 is integrally formed into an annular shape. The seat ring 4 includes an integrally formed axial portion 41 and radial portion 42. The axial portion 41 extends from the outer periphery of the radial portion 42 along the axial direction A toward the other side of the axial direction, and the radial portion 42 extends from the axial portion 41 along the radial direction R toward the radially inward direction. The axial portion 41 is radially opposite to the axial portion 31 of the shaft ring, and the radial portion 42 is radially opposite to the radial portion 32 of the shaft ring, thereby forming a mounting space for the cage 1 and the rolling element 2 between the shaft ring 3 and the seat ring 4.

[0048] Furthermore, such as Figure 2CAs shown, a first opening 51 is formed between the axial portion 31 of the bearing ring and the radial portion 42 of the bearing ring, opening towards one axial side. The first opening 51 is opposite to the inner rolled edge 11. A second opening 52 is formed between the axial portion 41 of the bearing ring and the radial portion 32 of the bearing ring, opening towards the other axial side. The second opening 52 is opposite to the outer rolled edge 12. Because the gap between the outer rolled edge 12 of the cage 1 and the radial portion 32 of the bearing ring is relatively large and this gap is opposite to or connected to the second opening 52, even if a notch 1C is not formed on the outer rolled edge 12, it will not affect the lubricating oil entering and exiting the bearing through the second opening 52. However, the gap between the inner rolled edge 11 of the cage 1 and the axial portion 31 of the bearing ring is very small, so the lubricating oil passing through the first opening 51 has difficulty entering and exiting the bearing through this gap. Therefore, in this embodiment, as Figures 2A to 2C As shown, the inward rolled edge 11 has multiple notches 1C, and the multiple notches 1C are evenly distributed on the circumferential C.

[0049] like Figure 2B and Figure 2C As shown, notches 1C are formed in the first connecting portion 112 and the first folding portion 113. That is, by cutting the first connecting portion 112 and the first folding portion 113, multiple notches 1C extending a certain length in the circumferential direction C are formed at different locations in the first connecting portion 112 and the first folding portion 113. The notches 1C penetrate in the axial direction A, causing a change in the radial dimension of the retainer 1. Thus, the radial dimension of the retainer 1 at the notches 1C (the radial width of the retainer 1) is smaller than the radial dimension of the retainer 1 at other locations, resulting in a greater radial clearance (R) between the retainer 1 at the notches 1C and the axial portion 31 of the shaft ring than the radial clearance (R) between the retainer 1 at other locations except for the notches 1C and the axial portion 31 of the shaft ring. Therefore, as... Figure 2C As indicated by the arrow, the lubricating oil flowing in through the first opening 51 can smoothly pass through the notch 1C formed on the inner rolled edge 11 into the bearing and flow out from the second opening 52. Of course, Figure 2C The arrows in the diagram are for illustrative purposes only. In actual applications, lubricating oil can also enter the bearing through the second opening 52 and flow out through the first opening 51.

[0050] The structure of the thrust bearing according to the second embodiment of this application is described below.

[0051] (Structure of the thrust bearing according to the second embodiment of this application)

[0052] The structure of the thrust bearing according to the second embodiment of this application is basically the same as that of the thrust bearing according to the first embodiment of this application. The main differences between the two are described below.

[0053] In this embodiment, as Figure 3As shown, both the inner rolled edge 11 and the outer rolled edge 12 extend from the middle portion 13 toward one axial side. Therefore, since the gap between the inner rolled edge 11 of the cage 1 and the radial portion 42 of the bearing race is relatively large, and this gap is opposite to or connected to the first opening 51, even without forming a notch 1C in the inner rolled edge 11, the lubricating oil can enter and exit the bearing through the first opening 51. However, the gap between the outer rolled edge 12 of the cage 1 and the axial portion 41 of the bearing race is very small, making it difficult for the lubricating oil through the second opening 52 to enter and exit the bearing. Therefore, in this embodiment, as... Figure 3 As shown, the outer rolled edge 12 has multiple notches 1C, and the multiple notches 1C are evenly distributed on the circumferential C.

[0054] Understandable, with Figure 2C In different ways, Figure 3 In the middle, the inner rolled edge 11 and the outer rolled edge 12 extend or extend toward the side where the seat ring is located.

[0055] Notch 1C is formed in the second connecting portion 122 and the second folding portion 123. That is, by cutting the second connecting portion 122 and the second folding portion 123, multiple notches 1C extending a certain length in the circumferential direction C are formed at different locations in the second connecting portion 122 and the second folding portion 123. The notches 1C penetrate in the axial direction A, causing a change in the radial dimension of the retainer 1. Thus, the radial dimension of the retainer 1 at the notch 1C (the radial width of the retainer 1) is smaller than the radial dimension of the retainer 1 at other locations, resulting in a greater radial gap (R) between the retainer 1 at the notch 1C and the axial portion 41 of the seat ring than the radial gap (R) between the retainer 1 at other locations except the notch 1C and the axial portion 41 of the seat ring. Therefore, as... Figure 3 As indicated by the arrow, the lubricating oil flowing in through the second opening 52 can smoothly enter the bearing through the notch 1C formed on the outer rolled edge 12 and flow out from the first opening 51. Of course, Figure 3 The arrows in the diagram are for illustrative purposes only. In actual applications, lubricating oil can also enter the bearing from the first opening 51 and flow out from the second opening 52.

[0056] The following describes the structure of the thrust bearing according to the third embodiment of this application.

[0057] (Structure of the thrust bearing according to the third embodiment of this application)

[0058] The structure of the thrust bearing according to the third embodiment of this application is basically the same as that of the thrust bearing according to the first embodiment of this application. The following mainly describes the differences between the two.

[0059] In this embodiment, as Figures 4A to 4CAs shown, the retainer 1' includes an inward rolled edge 11', an outward rolled edge 12', and a middle portion 13', both of which extend from the middle portion 13' toward the other side of the axial direction. The inward rolled edge 11' includes a first bent portion 111', a first connecting portion 112', and a first folded-back portion 113'. In this embodiment, the first bent portion 111' and the first folded-back portion 113' have similar shapes to those in the first embodiment, but the first connecting portion 112' is not bent as in the first embodiment. Instead, it bends 90 degrees from the first bent portion 111', extends a certain distance along the radial direction R, and then bends 90 degrees again. Therefore, unlike the first embodiment, the first connecting portion 112' includes a first radial portion 112R' extending along the radial direction R. Similarly, the outward rolled edge 12' includes a second bent portion 121', a second connecting portion 122', and a second folded-back portion 123'. In this embodiment, the second bending portion 121' and the second fold-back portion 123' have similar shapes to those in the first embodiment. However, the second connecting portion 122' is not bent as in the first embodiment. Instead, it bends 90 degrees from the second bending portion 121', extends a certain distance along the radial direction R, and then bends 90 degrees again. Therefore, unlike the first embodiment, the second connecting portion 122' includes a second radial portion 122R' extending along the radial direction R.

[0060] exist Figure 4C In the middle, the inner rolled edge 11' and the outer rolled edge 12' extend or extend toward the side where the shaft ring is located.

[0061] Furthermore, in this embodiment, as Figure 4B and Figure 4C As shown, the notch 1C' can be formed on the first connecting portion 112' and the first folded-back portion 113'. In particular, the notch 1C' can be formed on at least the first radial portion 112R' and the first folded-back portion 113'. In this way, the same effect as the first embodiment can be achieved.

[0062] The following describes the structure of the thrust bearing according to the fourth embodiment of this application.

[0063] (Structure of the thrust bearing according to the fourth embodiment of this application)

[0064] The structure of the thrust bearing according to the fourth embodiment of this application is basically the same as that of the thrust bearing according to the third embodiment of this application. The main differences between the two are described below.

[0065] In this embodiment, as Figure 5As shown, both the inward rolled edge 11' and the outward rolled edge 12' extend from the middle portion 13' toward one side of the axial direction. Therefore, similar to the second embodiment, a notch 1C' is formed on the outward rolled edge 12'. The notch 1C' can be formed on the second connecting portion 122' and the second folded-back portion 123', and in particular, the notch 1C' can be formed on the second radial portion 122R' and the second folded-back portion 123'. In this way, the same effect as the second embodiment can be achieved.

[0066] Understandable, with Figure 4C In different ways, Figure 5 In the middle, the inner rolled edge 11' and the outer rolled edge 12' extend or extend toward the side where the seat ring is located.

[0067] Of course, this application is not limited to the above-described embodiments. Those skilled in the art can make various modifications to the above-described embodiments of this application under the guidance of this application, without departing from the scope of this application. Therefore, the following description is provided.

[0068] i. The above embodiments illustrate a scheme in which one of the inner rolled edges 11, 11' and the outer rolled edges 12, 12' is formed with a notch 1C, 1C', but this application is not limited thereto. If necessary, both the inner rolled edges 11, 11' and the outer rolled edges 12, 12' can be formed together with a notch of a certain width in the circumferential direction C to improve the lubrication performance of the thrust bearing.

[0069] ii. In order to ensure the strength of the cage, the size and number of notches 1C and 1C' can be adjusted as needed.

[0070] iii. The thrust bearing cage described in the first and second embodiments above can also be called a thrust closed double-rolled edge cage, and the thrust bearing cage described in the third and fourth embodiments above can also be called a thrust open double-rolled edge cage. In fact, the shapes of the inner rolled edges 11, 11' and the outer rolled edges 12, 12' can be designed according to the required dimensions and structural strength of the cage 1, 1'.

[0071] iv. In the above embodiments, the method for forming the notches 1C and 1C' may be that during the stamping process of the cage 1 and 1', the material corresponding to the notch forming part of the cage blank is cut off by a stamping die, and then the processed blank is turned over to form the cage 1 and 1'.

[0072] v. It is understood that, particularly in the third and fourth embodiments, the notch 1C' may also be formed in or only in the first connecting portion 112' and / or the second connecting portion 122'. For example, the notch 1C' may also be one or more through holes formed in the first connecting portion 112' and / or the second connecting portion 122'; the notch 1C' may also be formed in or only in the first bending portion 111' and / or the second bending portion 121'. For example, the notch 1C' may also be one or more through holes formed in the first bending portion 111' and / or the second bending portion 121'. This application does not limit the shape of these through holes, which may be various shapes such as circular, elliptical, elongated, or elongated with rounded corners.

[0073] vi. It is understood that the various structures or features in different embodiments may be appropriately combined or replaced.

Claims

1. A thrust bearing comprising a plurality of rolling elements (2), a shaft ring (3), a seat ring (4), and a cage (1, 1'), wherein a first opening (51) opening toward one axial side and a second opening (52) opening toward the other axial side are formed between the shaft ring (3) and the seat ring (4), the cage (1, 1') being formed in an annular shape, the cage (1, 1') comprising radially inner rolled edges (11, 11'), radially outer rolled edges (12, 12'), and an intermediate portion (13, 13') therebetween, the intermediate portion (13, 13') forming a plurality of pockets for mounting the rolling elements (2) of the thrust bearing, the plurality of pockets being evenly distributed at intervals along the circumference (C) of the cage (1, 1'). The first opening (51) is opposite to the inward rolled edge (11, 11'), and the second opening (52) is opposite to the outward rolled edge (12, 12'). Both the inward rolled edge (11, 11') and the outward rolled edge (12, 12') extend from the middle portion (13, 13') toward one side of the axial direction. The outward rolled edge (12, 12') has a notch (1C, 1C') that passes through the axial direction (A) of the retainer (1, 1') and causes the radial dimension of the retainer (1, 1') to change. Alternatively, both the inward rolled edge (11, 11') and the outward rolled edge (12, 12') extend from the middle portion (13, 13') toward the other side of the axial direction. The inward rolled edge (11, 11') has a notch (1C, 1C') that passes through the axial direction (A) of the retainer (1, 1') and causes the radial dimension of the retainer (1, 1') to change.

2. The thrust bearing according to claim 1, characterized in that, The inward rolled edge (11, 11') includes a first bent portion (111, 111'), a first connecting portion (112, 112'), and a first folded-back portion (113, 113') connected in sequence. The first bent portion (111, 111') and the first folded-back portion (113, 113') extend along the axial direction (A) of the retainer (1, 1'). The first folded-back portion (113, 113') is located radially inside the first bent portion (111, 111'). The notch (1C, 1C') is formed in the first connecting portion (112, 112') and / or the first folding portion (113, 113').

3. The thrust bearing according to claim 2, characterized in that, The first connecting portion (112') extends at least partially along the radial direction (R).

4. The thrust bearing according to any one of claims 1 to 3, characterized in that, The outer rolled edge (12, 12') includes a second bent portion (121, 121'), a second connecting portion (122, 122'), and a second folded-back portion (123, 123') connected in sequence. The second bent portion (121, 121') and the second folded-back portion (123, 123') extend along the axial direction (A) of the retainer (1, 1'). The second folded-back portion (123, 123') is located radially outside the second bent portion (121, 121'). The notch (1C, 1C') is formed in the second connecting portion (122, 122') and / or the second folding portion (123, 123').

5. The thrust bearing according to claim 4, characterized in that, The second connecting portion (122') extends at least partially along the radial direction (R).

6. The thrust bearing according to claim 1, 2, 3, or 5, characterized in that, The retainer (1, 1') is formed with a plurality of notches (1C, 1C'), which are evenly distributed in the circumferential direction (C).

7. The thrust bearing according to claim 1, characterized in that, The radial dimension of the retainer (1, 1') at the notch (1C, 1C') is smaller than the radial dimension of the retainer (1, 1') at other parts.

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