JP6750331B2 - Method for manufacturing cage for thrust roller bearing - Google Patents

Description

The present invention, the present invention relates to a retainer for manufacturing how a thrust roller bearing.

2. Description of the Related Art Conventionally, there is known a thrust roller bearing in which a plurality of rollers are rollably interposed between two races arranged to face each other. The thrust roller bearing is, for example, inserted in a transmission of a vehicle between a non-rotating member and a rotating member, and is used to smoothly rotate the rotating member while receiving a thrust force in the rotation axis direction.

In the thrust roller bearing, the plurality of rollers are rollably held by a cage. As a retainer used for a thrust roller bearing, a combination of two plate materials (hereinafter referred to as a two-sheet retainer) is known (for example, refer to Patent Document 1).

The double retainer is configured by combining an outer retainer and an inner retainer. The outer cage is formed in a U-shape with a cross section perpendicular to the circumferential direction opening in one side in the axial direction. The inner cage has a U-shaped cross section that is perpendicular to the circumferential direction and opens to the other axial direction. The opening-side end of the inner cage is inserted through the opening of the outer cage and is housed in the outer cage. The outer cage and the inner cage are integrated by caulking the outer periphery of the outer cage with the inner cage housed in the outer cage.

A plurality of holding holes for holding a plurality of rollers are formed in the outer cage and the inner cage, respectively. The width of the holding hole is formed to be smaller than the diameter of the roller, and by locking the roller to the outer cage or the inner cage around the periphery of the holding hole, the roller is prevented from coming off the cage.

Since the width of the holding hole is smaller than the diameter of the roller, when assembling the cage, the inner cage is housed in the outer cage with the rollers arranged in the holding hole of the inner cage, and the outer cage is It is necessary to suppress the separation between the outer cage and the inner cage by integrating the inner cage with the inner cage by caulking.

JP, 2008-075752, A

By the way, the cage and the cage are made of different materials and are subjected to different heat treatments and different finishing processes. Therefore, the heat treatment cannot be performed in a state where the cage and the unit are integrated.

Therefore, in the conventional thrust roller bearing, it is necessary to crimp the outer cage and the inner cage that have been heat-treated or surface-treated in advance. Since the outer cage and the inner cage after heat treatment have high surface hardness, when a tensile stress exceeding the material strength occurs during crimping, cracks or microcracks occur in the crimped portion.

In particular, if a material with high hardness is used for both cages to improve wear resistance, or if the surface hardness of both cages is increased by heat treatment, the workability of the outer cage and inner cage after heat treatment will increase. It further decreases, and cracks and minute cracks are likely to occur during caulking.

The present invention aims to provide a manufacturing how the suppressible thrust roller bearing cage that occur cracks or microcracks in the cage.

In order to achieve the above object, the present invention provides a cylindrical first inner cylinder portion and a cylindrical first outer cylinder provided on the outer periphery of the first inner cylinder portion coaxially with the first inner cylinder portion. And a first holding portion formed by connecting a plurality of first holding holes for holding a plurality of rollers by connecting one axial end portions of the first inner tubular portion and the first outer tubular portion to each other. A first retainer made of metal having, a cylindrical second inner cylinder part, and a cylindrical second outer part provided coaxially with the second inner cylinder part on the outer periphery of the second inner cylinder part. A second portion having a plurality of second holding holes for connecting the tubular portion, the other axial end portions of the second inner tubular portion and the second outer tubular portion, and holding the plurality of rollers. A second retainer made of a metal having a retainer, and the first retainer and the second retainer sandwiching the plurality of rollers so that the plurality of rollers are rollably retained. A method for manufacturing an annular thrust roller bearing retainer, wherein the other axial end portion of the first inner tubular portion is bent toward the outer peripheral side, and the other axial end portion of the first outer tubular portion is provided. And a first bending step of bending the second inner cylindrical portion toward the outer peripheral side, and bending one end portion of the second inner cylindrical portion in the axial direction toward the outer peripheral side, and one end portion of the second outer cylindrical portion in the axial direction toward the inner peripheral side. A second bending step of bending, and a press-fitting step of press-fitting the second cage into the first cage and engaging the first cage and the second cage after the first and second bending steps. And a method for manufacturing a cage for a thrust roller bearing.

According to the present invention can provide a manufacturing how the suppressible thrust roller bearing cage that cracks or micro-cracks in the cage occurs.

It is an exploded perspective view of a cage for thrust roller bearings. It is sectional drawing of the cage for thrust roller bearings of FIG. It is the perspective view which expanded the principal part of the cage for thrust roller bearings of FIG. It is a flow figure explaining the manufacturing method of the cage for thrust roller bearings. (A)-(c) is explanatory drawing explaining the assembly process in the manufacturing method of the cage for thrust roller bearings of FIG.

[Embodiment]
An embodiment of the present invention will be described with reference to FIGS. 1 to 5. The embodiment described below is shown as a preferred specific example for carrying out the present invention, and there are parts that specifically exemplify various technically preferable technical matters. The technical scope of the present invention is not limited to this specific embodiment.

(Overall structure of cage 1 for thrust roller bearing)
FIG. 1 is an exploded perspective view of a thrust roller bearing cage 1. FIG. 2 is a cross-sectional view taken along a plane passing through the central axis of the thrust roller bearing retainer 1. FIG. 3 is an enlarged perspective view of a main portion of the thrust roller bearing retainer 1. In addition, the positional relationship between the outer cage 4 and the inner cage 5 is upside down between FIG. 1 and FIGS. 2 and 3. Further, in FIG. 3, the roller 2 is omitted.

As shown in FIGS. 1 to 3, a thrust roller bearing retainer 1 (hereinafter, simply referred to as a retainer 1) holds a plurality of rollers 2 in a rollable manner, and is formed in an annular shape as a whole. There is. The cage 1 is used as a thrust roller bearing by being sandwiched by two races having a raceway surface on which a plurality of rollers 2 roll. A thrust roller bearing using the cage 1 is used, for example, in a vehicle transmission, and is inserted between a shaft-shaped rotating member and a non-rotating member such as a transmission housing, and is held by the cage 1. The rolling of the rollers 2 smoothes the rotation of the rotating member while receiving the thrust force in the axial direction.

The cage 1 is a combination of an outer cage 4 and an inner cage 5. The outer cage 4 is an aspect of the first cage of the present invention, and the inner cage 5 is an aspect of the second cage of the present invention.

(Description of outer cage 4)
The outer cage 4 includes a short cylindrical first inner cylinder portion 41 and a short cylindrical first outer cylinder portion 42 provided coaxially with the first inner cylinder portion 41 on the outer periphery of the first inner cylinder portion 41. And a first holding portion in which a plurality of first holding holes 43 for holding the plurality of rollers 2 are formed by connecting the first inner tubular portion 41 and the first outer tubular portion 42 to each other in the axial direction. 44 and 44 are integrated.

The first inner tubular portion 41 and the first outer tubular portion 42 are concentrically formed to form a pair, and both have the same axial length. At the other end of the first inner tubular portion 41 in the axial direction (the end opposite to the connecting side of the first holding portion 44), there is provided a first inner bent portion 41a in which the other end is bent to the outer peripheral side. Has been formed. Similarly, at the other end of the first outer tubular portion 42 in the axial direction (the end opposite to the connecting side of the first holding portion 44), the first outer side is bent toward the inner peripheral side. The bent portion 42a is formed. Details of the first inner bent portion 41a and the first outer bent portion 42a will be described later.

Hereinafter, the end portion (one end portion in the axial direction) on the coupling side of the first holding portion 44 in the first inner tubular portion 41 and the first outer tubular portion 42 is referred to as the “base end portion”, and the opposite end portion thereof. (The other end in the axial direction) is referred to as the "tip". The first inner bent portion 41a is formed by bending the tip end portion of the first inner tubular portion 41 outward in the radial direction, and the first outer bent portion 42a bends the tip end portion of the first outer tubular portion 42 in a radial direction. It is formed by bending inward in the direction.

Further, the first outer cylinder portion 42 is formed with one or more notches 42b that penetrate the first outer cylinder portion 42 in the radial direction and that are open to the tip side (in the other direction of the axial direction). .. The details of the notch 42b will be described later.

The first holding portion 44 connects the base end portions of the first inner tubular portion 41 and the first outer tubular portion 42 to each other and closes the gap between the first inner tubular portion 41 and the first outer tubular portion 42. Is provided. The first holding portion 44 has a plate shape perpendicular to the axial direction and is formed in an annular shape. The corner portion connecting the first holding portion 44 and the first inner tubular portion 41 and the corner portion connecting the first holding portion 44 and the first outer tubular portion 42 are formed in a rounded shape. ..

The first holding portion 44 is formed with the same number of first holding holes 43 as the plurality of rollers 2. The first holding hole 43 is a substantially rectangular through hole that penetrates the first holding portion 44 in the axial direction (thickness direction). A plurality of first holding holes 43 are radially formed in the first holding portion 44 so as to rollably hold the plurality of radially arranged rollers 2.

In the present embodiment, the first holding holes 43 are arranged in two rows, the inner side and the outer side in the radial direction, and the first holding holes 43 are formed at equal intervals in the circumferential direction in each row. However, the invention is not limited to this, and the first holding holes 43 formed at equal intervals in the circumferential direction may have only one row in the radial direction, or the first holding holes formed at equal intervals in the circumferential direction. The 43 rows may be arranged in three or more rows in the radial direction. Further, here, a case is shown in which 26 first holding holes 43 are formed on the radially inner side and 34 first holding holes 43 are formed on the radially outer side, but the first holding holes of each row are shown. The number of 43 is not limited to this.

The width of the first holding hole 43 in the short side direction is smaller than the diameter of the roller 2. As a result, the first holding portion 44 (the columnar portion formed between the first holding holes 43 adjacent to each other in the circumferential direction) on the peripheral edge of the first holding hole 43 interferes with the roller 2 and the cage 1 for the roller 2 is provided. Withdrawal from is suppressed.

(Explanation of the inner cage 5)
The inner cage 5 includes a short cylindrical second inner cylinder portion 51 and a short cylindrical second outer cylinder portion 52 provided on the outer circumference of the second inner cylinder portion 51 coaxially with the second inner cylinder portion 51. And a second holding in which a plurality of second holding holes 53 for holding a plurality of rollers 2 are formed by connecting the other axial end portions of the second inner tubular portion 51 and the second outer tubular portion 52 to each other. And a portion 54.

The second inner tubular portion 51 and the second outer tubular portion 52 are concentrically formed to form a pair, and the axial lengths of the two are equal. At the other end of the second inner tubular portion 51 in the axial direction (the end on the opposite side to the connecting side of the second holding portion 54), there is provided a second inner bent portion 51a in which the other end is bent to the outer peripheral side. Has been formed. Similarly, at the other end in the axial direction of the second outer cylinder part 52 (the end opposite to the connecting side of the second holding part 54), the other end is bent to the inner peripheral side and the second outer side is formed. The bent portion 52a is formed. Details of the second inner bent portion 51a and the first outer bent portion 52a will be described later.

Hereinafter, the end portion (the other end portion in the axial direction) of the second holding portion 54 in the second inner tubular portion 51 and the second outer tubular portion 52 on the coupling side is referred to as a “base end portion”, and the other end thereof. The part (one end in the axial direction) is referred to as a "tip part". The second inner bent portion 51a is formed by bending the tip end portion of the second inner tubular portion 51 outward in the radial direction, and the second outer bent portion 52a radiates the tip end portion of the second outer tubular portion 52. It is formed by bending inward in the direction.

The second holding portion 54 connects the base end portions of the second inner tubular portion 51 and the second outer tubular portion 52, and closes the gap between the second inner tubular portion 51 and the second outer tubular portion 52. Is provided. The second holding portion 54 has a plate shape perpendicular to the axial direction and is formed in an annular shape. The corner portion connecting the second holding portion 54 and the second inner cylinder portion 51 and the corner portion connecting the second holding portion 54 and the second outer cylinder portion 52 are formed in a rounded shape. ..

The second holding portion 54 has the same number of second holding holes 53 as the plurality of rollers 2. The second holding hole 53 is a substantially rectangular through hole that penetrates the second holding portion 54 in the axial direction (thickness direction). In the second holding portion 54, a plurality of second holding holes 53 are radially formed so as to rollably hold the plurality of radially arranged rollers 2.

In the present embodiment, the second holding holes 53 are arranged in two rows, the inner side and the outer side in the radial direction, and the second holding holes 53 are formed at equal intervals in the circumferential direction in each row. However, the configuration is not limited to this, and the second holding holes 53 formed along the circumferential direction may have only one row in the radial direction, or the second holding holes 53 formed along the circumferential direction. The rows may be arranged in three or more rows in the radial direction. Further, here, a case is shown in which 26 second holding holes 53 are formed on the radially inner side and 34 second holding holes 53 are formed on the radially outer side, but the second holding holes of each row are shown. The number of 53 is not limited to this.

The width of the second holding hole 53 in the short side direction is smaller than the diameter of the roller 2. As a result, the second holding portion 54 (the columnar portion formed between the second holding holes 53 adjacent to each other in the circumferential direction) on the periphery of the second holding hole 53 interferes with the roller 2 and the cage 1 for the roller 2 is provided. Withdrawal from is suppressed.

(Engagement of the outer cage 4 and the inner cage 5)
In the cage 1, the inner cage 5 is accommodated in the outer cage 4, and the outer cage 4 and the inner cage 5 are engaged with each other by the first inner bent portion 41a and the first outer bent portion 42a. ing. In the present embodiment, almost the entire inner cage 5 is housed in the outer cage 4, but a part of the inner cage 5 may protrude from the outer cage 4. The inner cage 5 is inserted and accommodated in the outer cage 4 from the tip portions of the second inner tubular portion 51 and the second outer tubular portion 52.

(Material of the outer cage 4 and the inner cage 5)
The outer cage 4 and the inner cage 5 are both made of metal. In the present embodiment, the outer cage 4 and the inner cage 5 are formed by punching and bending a steel plate by pressing or the like. By making the outer cage 4 and the inner cage 5 made of metal, the mechanical strength and durability of the cage 1 are improved as compared with the case where the outer cage 4 and the inner cage 5 are made of resin. it can. Further, the thrust roller bearing using the cage 1 can be applied to applications where resin cannot be applied.

In the present embodiment, SCM415 (chromium molybdenum steel) having excellent wear resistance is used as the steel plate used for the outer cage 4 and the inner cage 5. Although SCM415 has excellent wear resistance, it has relatively low workability, and cracks and minute cracks easily occur when it is largely bent after heat treatment. Therefore, it is desired to devise the manufacturing method of the cage 1 to suppress the generation of cracks and minute cracks. The plate thickness of the steel plate used for the outer cage 4 and the inner cage 5 is, for example, 0.4 mm or more and 0.6 mm or less.

(Description of manufacturing method of cage 1)
FIG. 4 is a flowchart illustrating the method for manufacturing the cage 1. In addition, FIGS. 5A to 5C are explanatory views for explaining the assembling steps in the manufacturing method of the cage 1.

As shown in FIG. 4, when manufacturing the cage 1, first, in step S1, a steel plate serving as a raw material is punched and bent by a press or the like to separate the outer cage 4 and the inner cage 5 from each other. Mold (molding process).

In the present embodiment, at the time of this molding step, a first bending step of bending the distal end portion of the first inner cylindrical portion 41 toward the outer peripheral side and bending the distal end portion of the first outer cylindrical portion 42 toward the inner peripheral side, The second bending step of bending the tip of the second inner cylinder portion 51 to the outer peripheral side and bending the tip of the second outer cylinder portion 52 to the inner peripheral side is performed at the same time. That is, the bending portions 41a, 42a, 51a, 52a are formed in a state in which the tip portions of the tubular portions 41, 42, 51, 52 are bent toward the roller 2 side during pressing. The first and second bending steps may be separately performed after the molding step.

Further, in the present embodiment, at the time of the molding step, one or more notches 42b that axially penetrate through the first outer tubular portion 42 and open in the other axial direction are formed in the first outer tubular portion 42. The notch forming step for forming is performed at the same time. That is, the notch 42b is formed by punching out the portion of the steel plate that becomes the notch 42b during pressing. The notch forming step may be separately performed after the molding step.

After that, in step S2, a heat treatment step of performing heat treatment (carburizing heat treatment) on the outer cage 4 and the inner cage 5 molded in step S1 is performed.

Then, in step S3, the assembly process of assembling the cage 1 is performed using the heat treated outer cage 4 and the inner cage 5. In the outer cage 4 and the inner cage 5 before assembly, as shown in FIG. 5A, the tip portions of the tubular portions 41, 42, 51, 52 are bent to the roller 2 side. ..

In the assembly process of step S3, first, in step S31, the rollers 2 are arranged in the respective second holding holes 53 of the inner cage 5. As shown in FIG. 5B, since the width of each second holding hole 53 in the short side direction is smaller than the diameter of the roller 2, the roller 2 is held by the second holding portion 54 at the peripheral edge of the second holding hole 53. It will be in the state of being.

Then, in step S32, a press-fitting process of press-fitting the inner cage 5 into the outer cage 4 and engaging the outer cage 4 and the inner cage 5 is performed.

In order to facilitate the press-fitting of the inner cage 5 into the outer cage 4 in the press-fitting process, the tip of the second inner tubular portion 51 is positioned radially outward of the tip of the first inner tubular portion 41. Moreover, it is desirable to adjust the bending condition of each of the bent portions 41a, 42a, 51a, 52a so that the tip end portion of the second outer tubular portion 52 is located radially inward of the first outer tubular portion 42. This facilitates the press-fitting of the inner cage 5 into the outer cage 4, and the positioning of both cages 4 and 5 can be performed only by placing the outer cage 4 on the inner cage 5. Therefore, the assemblability is improved. When the second inner and outer bent portions 51a and 52a are omitted, it becomes difficult to press-fit the inner cage 5 into the outer cage 4 in which the first inner and outer bent portions 41a and 42a are formed. The second inner and outer bent portions 51a and 52a are essential.

When the inner cage 5 is pushed into the outer cage 4, the cylindrical portions 41, 42, 51, 52 are elastically deformed, and the inner cage 5 is inserted into the outer cage 4. At this time, if the engagement between the outer cage 4 and the inner cage 5 is too large, it becomes difficult to press-fit the inner cage 5 into the outer cage 4, and if it is forcibly pushed in, the tubular portions 41, 42, 51 are pressed. There is a risk that the plastics 52 will be plastically deformed. In addition, if the engagement distance between the outer cage 4 and the inner cage 5 is too small, the amount of crimping (bending amount) in the caulking step described later increases, causing cracks and cracks. Therefore, it is necessary to adjust the clearance between the outer cage 4 and the inner cage 5 so that the load during press fitting does not become excessive and cracks or cracks do not occur in the caulking process.

It should be noted that the engagement distance between the outer cage 4 and the inner cage 5 referred to here is the maximum distance B along the radial direction between the inner peripheral surface of the second inner cylindrical portion 51 and the outer peripheral surface of the second outer cylindrical portion 52. , The minimum distance along the radial direction of the outer peripheral surface of the first inner tubular portion 41 and the inner peripheral surface of the first outer tubular portion 42 (that is, between the tip portions of the first inner tubular portion 41 and the first outer tubular portion 42). It is 1/2 of the value obtained by subtracting the distance A along the radial direction (see FIG. 5B).

Specifically, the clearance between the outer cage 4 and the inner cage 5 may be 5 μm or more and 50 μm or less. This is because if the running allowance is less than 5 μm, cracks or cracks are likely to occur during the caulking process, and if the running allowance exceeds 50 μm, it becomes difficult to press fit both cages 4, 5. The margin between the outer cage 4 and the inner cage 5 can be adjusted by the bending degree of each of the bent portions 41a, 42a, 51a, 52a in the forming step (first and second bending step) of step S1. ..

Further, in the present embodiment, the notch 42b is formed in the first outer cylinder portion 42 of the outer cage 4 in order to facilitate the press-fitting of the inner cage 5 into the outer cage 4. By forming the notch 42b, the first outer cylinder portion 42 is easily elastically deformed, and the inner retainer 5 is more easily press-fitted into the outer retainer 4. Therefore, even when the engagement distance between the outer cage 4 and the inner cage 5 is set to be relatively large, the inner cage 5 can be easily press-fitted into the outer cage 4, and cracks or cracks at the time of caulking can be obtained. It is possible to further suppress the occurrence of.

In order to facilitate press-fitting of the inner cage 5 into the outer cage 4, it is desirable to form a plurality of notches 42b, and it is more desirable to form three or more notches 42b at equal intervals in the circumferential direction. .. In the present embodiment, four notches 42b are formed at equal intervals in the circumferential direction, but the number of notches 42b is not limited to this.

When the number of the notches 42b is one, it is slanted into the outer cage 4 on the opposite side of the notches 42b (position of 180° rotational symmetry with the notch 42b with the central axis of the cage 1 as the axis of symmetry). It is advisable to insert the inner cage 5 into the inner cage 5 and then push the inner cage 5 into the outer cage 4 on the side of the notch 42b. When a plurality of (preferably three or more) notches 42b are formed at equal intervals in the circumferential direction, the inner cage 5 is placed inside the outer cage 4 with the outer cage 4 being overlaid on the inner cage 5. It can be easily press-fitted, and the assemblability is improved as compared with the case where only one notch 42b is provided.

As shown in FIG. 5C, when the inner cage 5 is press-fitted into the outer cage 4, the base end portion of the second inner tubular portion 51 (the second inner tubular portion 51 and the second holding portion 54 are connected to each other). The first inner bent portion 41a is engaged with a rounded corner portion of the second outer tubular portion 52, and the base end portion of the second outer tubular portion 52 (the second outer tubular portion 52 and the second holding portion 54 is connected to each other). The first outer bent portion 42a is engaged with the (cornered corner portion), and the outer cage 4 and the inner cage 5 are engaged. When the inner cage 5 is press-fitted into the outer cage 4, the tip ends of the first inner tubular portion 41 and the first outer tubular portion 42 of the outer cage 4 are the second inner tubular portions of the inner cage 5. The inner peripheral surface of the portion 51 and the outer peripheral surface of the second outer cylindrical portion 52 rub against each other, and scratch marks are formed on the inner peripheral surface of the second inner cylindrical portion 51 and the outer peripheral surface of the second outer cylindrical portion 52.

After performing the press-fitting step of step S32, in step S33, the tip portion of the first inner tubular portion 41 is further bent to the outer peripheral side, and the tip portion of the first outer tubular portion 42 is further bent to the inner peripheral side. Then, the crimping process of crimping the outer cage 4 and the inner cage 5 is performed. The tip ends of the first inner tubular portion 41 and the first outer tubular portion 42 can be bent by, for example, roll bending. In the present embodiment, since the tip portions of the first inner tubular portion 41 and the first outer tubular portion 42 are bent in advance, the crimping amount (bending amount) in the crimping step of step S33 is It is possible to suppress the occurrence of cracks and minute cracks due to caulking. By the crimping step of step S33, the cage 1 in which the outer cage 4 and the inner cage 5 are integrated is obtained.

If the outer cage 4 and the inner cage 5 are sufficiently fixed by the press-fitting step of step S32 and the outer cage 4 and the inner cage 5 can be sufficiently prevented from being separated, The crimping step of S33 may be omitted.

(Operation and Effect of Embodiment)
As described above, in the method for manufacturing the cage 1 according to the present embodiment, the distal end portion of the first inner tubular portion 41 is bent to the outer peripheral side and the distal end portion of the first outer tubular portion 42 is directed to the inner circumferential side. A first bending step of bending, a second bending step of bending the tip end portion of the second inner cylindrical portion 51 to the outer peripheral side and bending one end portion of the second outer cylindrical portion 52 in the axial direction to the inner peripheral side, After the first and second bending steps, a press-fitting step of press-fitting the inner cage 5 into the outer cage 4 and engaging the outer cage 4 and the inner cage 5 is included.

By forming the first inner and outer bent portions 41a and 42a in advance in the first bending step and press-fitting the inner cage 5 into the outer cage 4 in the press-fitting step, caulking in a later crimping step The amount (bending amount) can be reduced (or the crimping step can be omitted). As a result, even if a material with high hardness is used for both cages to improve wear resistance, or even if the surface hardness of both cages is increased by heat treatment, cracks and minute cracks due to caulking do not occur. It becomes possible to suppress.

In addition, by forming the second inner and outer bent portions 51a and 52a by the second bending step, even in the state where the first inner and outer bent portions 41a and 42a are formed in the outer cage 4, inside the outer cage 4 It becomes possible to press fit the inner cage 5 into the.

Furthermore, in the present embodiment, since the first and second bending steps are performed before the heat treatment step, it is possible to suppress the occurrence of cracks and minute cracks in the first and second bending steps.

Furthermore, in the present embodiment, since the first outer tubular portion 42 is formed with one or more notches 42b that penetrate the first outer tubular portion 42 in the axial direction and that are open to the tip side, When the inner cage 5 is press-fitted into the outer cage 4, the first outer tubular portion 42 is easily elastically deformed, and the press-fitting process can be easily performed.

DESCRIPTION OF SYMBOLS 1... Thrust roller bearing retainer (retainer), 2... Roller, 4... Outer retainer, 41... 1st inner cylinder part, 41a... 1st inner bending part, 42... 1st outer cylinder part, 42a... DESCRIPTION OF SYMBOLS 1 outer bending part, 42b... notch, 43... 1st holding hole, 44... 1st holding part, 5... inner side retainer, 51... 2nd inner cylinder part, 51a... 2 inner side bending part, 52... 2nd outer Cylindrical portion, 52a... Second outer bent portion, 53... Second holding hole, 54... Second holding portion

Claims (4)

A first cylindrical inner cylinder, a first cylindrical outer cylinder provided on the outer periphery of the first inner cylinder coaxially with the first inner cylinder, the first inner cylinder, and the first inner cylinder. A first retainer made of a metal having a first retaining portion that connects one axial end portions of the first outer tubular portion to each other and has a plurality of first retaining holes for retaining a plurality of rollers; ,
A cylindrical second inner tubular portion, a cylindrical second outer tubular portion provided on the outer periphery of the second inner tubular portion coaxially with the second inner tubular portion, the second inner tubular portion, and the second inner tubular portion A second holding made of metal having a second holding portion that connects the other axial end portions of the second outer tubular portion to each other and has a plurality of second holding holes for holding the plurality of rollers. And a container,
A method for manufacturing an annular thrust roller bearing retainer for rollingly holding the plurality of rollers by sandwiching the plurality of rollers between the first cage and the second cage,
A first bending step of bending the other end of the first inner cylinder in the axial direction toward the outer circumference and bending the other end of the first outer cylinder in the axial direction toward the inner circumference;
A second bending step of bending one end portion of the second inner cylinder portion in the axial direction toward the outer peripheral side and bending one end portion of the second outer cylinder portion in the axial direction toward the inner peripheral side;
A press-fitting step of press-fitting the second cage into the first cage and engaging the first cage and the second cage after the first and second bending steps.
Method of manufacturing cage for thrust roller bearing. The first cage and the second cage are made of steel plate,
A heat treatment step of performing heat treatment on the first cage and the second cage after the first and second bending steps and before the press-fitting step,
A method for manufacturing a cage for thrust roller bearings according to claim 1. Before the press-fitting step, a notch forming step of forming, in the first outer cylinder portion, one or more notches that penetrate the first outer cylinder portion in the axial direction and open in the other axial direction. Including,
A method for manufacturing a cage for thrust roller bearings according to claim 1 or 2. After the press-fitting step, the other end portion of the first inner tubular portion in the axial direction is further bent toward the outer peripheral side, and the other end portion of the first outer tubular portion in the axial direction is further bent toward the inner circumferential side, A crimping step of crimping the first cage and the second cage;
A method for manufacturing a cage for thrust roller bearings according to any one of claims 1 to 3.

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