JP2000257638A - Holder for roller bearing and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a holder for a roller bearing with a large load capacity in light weight and a manufacturing method of this holder, by molding a pipe- shaped material by bulging work into an annular member having a prescribed sectional shape, and forming a window for roller holding in the annular member, in this invention. SOLUTION: A plurality of windows 10 for charging with roller are formed by punching in an annular member formed by bulging work from a thin metal- made pipe-shaped material. A pillar part 3 of a holder 1 left to be formed in a barrel part, when the window 10 is formed, comprises a pillar central part 4 formed in the axial direction center, pillar end parts 6 integrally connected to a pair of annular side parts 2, and pillar sloped parts 8 integrally connecting the pillar central part 4 and the pillar end parts 6. Thickness of the annular side part 2 is formed in thin thickness similar to thickness of the pillar part 3, and the holder 1, reduced in weight, displays good rotational quality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cage in which needle rollers are incorporated in a roller bearing such as a needle roller bearing, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventional roller bearings with cages are excellent in rotational performance used in high-speed rotating parts and engine parts of various machines. As shown in FIGS. 9 to 11, a conventional roller bearing 30 with a retainer is configured by incorporating a large number of needle rollers 41 into a substantially cylindrical retainer 31 having an M-shaped cross section and high rigidity. ing. The retainer 31 has an annular side portion 32 at both ends in the axial direction, and both annular side portions 32.
A plurality of pillar portions 33 are formed integrally with each annular side portion 32 and extend in parallel with each other and are spaced apart in the axial direction to connect the annular side portions 32. A window 40 into which each of the needle rollers 41 is inserted is formed by the annular side portion 32 and a pair of adjacent pillar portions 33, 33. Therefore, a plurality of windows 40 are formed on the body peripheral wall of the retainer 31 at equal intervals in the circumferential direction.

As shown in FIG. 9, in each pillar 33,
Column central portion 34 located at the center of holder 31 as viewed in the axial direction
Are bent inward in the radial direction, and both column ends 36 are bent radially outward from the column central portion 34 toward both ends in the axial direction via column inclined portions 38, respectively. Each is connected to both annular side parts 32. Therefore, the retainer 31 is formed such that the cross-sectional shape is substantially M-shaped. Both side surfaces 39 facing the circumferential direction of each column inclined portion 38
Is a guide surface for guiding the rotation of the needle rollers 41 inserted into the window 40. At the radially inner edge of the column center portion 34, an inner protrusion 35 protruding into the window 40
Are formed. The inner protrusion 35 is engaged with the needle roller 41 to prevent the needle roller 41 from dropping radially inward. At the radially outer edge of the column end 36, a window 40
An outer protrusion 37 protruding inward is formed. The outer protrusion 37 is engaged with the needle roller 41 to prevent the needle roller 41 from dropping radially outward.

[0004] The diameter of the needle rollers 41 incorporated in each window 40 is larger than the thickness of the cage 31, but the difference between the diameters is very small. A roller bearing composed of the cage 31 and the needle rollers 41 incorporated and held in the cage 31 can take advantage of the processing accuracy of the raceway surface if it is combined with a heat-treated and ground finished shaft and a housing hole as the raceway surface. It can be used in a small space. Although the pillar portion 33 is thin, it is formed to be largely bent in a substantially M-shape, so that the retainer 31 exhibits sufficiently high rigidity. Further, since a large amount of lubricant is held around the needle rollers 41 in the window 40, the lubricant holding capacity of the retainer 31 is large. Since the cage 31 accurately guides the needle rollers 41, the roller bearings configured by incorporating the needle rollers 41 into the cage 31 have excellent rotation performance, and are widely used in bearings for high-speed rotation over a long period of time. Used for applications.

[0005] The retainer 31 is conventionally manufactured by a manufacturing method using cutting. That is, a tubular material having a width similar to that of the cage 31 as a finished product is processed into an annular member having an M-shaped cross section by turning, and a press working is performed on a body portion of the annular member processed into an M-shaped cross section. In this way, a plurality of windows for inserting needle rollers are perforated at intervals in the circumferential direction, thereafter, heat treatment is performed, and if necessary, outer peripheral grinding is performed, and finally, a surface treatment (for example,
Silver plating is performed after copper plating.

As another manufacturing method of the cage, it can be manufactured by roll forming. That is, a material or a thin pipe material obtained by pressing a thin metal plate into a cylindrical shape by press working is loosely fitted with a small-diameter female roll from the inside, and the female roll and a large-diameter male roll disposed outside. By pressing both rolls at high speed while pressing the cylindrical material therebetween, the cylindrical material is compression-molded into an M-shaped cross section. Cross section M
A window for accommodating needle rollers is formed in the cylindrical material formed into a mold by punching.

[0007]

In a cage manufactured by turning shown in FIG. 9, an annular side portion 32 and a column portion 33 are provided.
In order to prevent the occurrence of cracks due to local stress, a corner R is intentionally added to the inner corner portion of the integral joint portion 42 with the inner corner portion. Further, when chucking the annular material in the turning process, the portion corresponding to the annular side portion 32 is chucked, so that the thickness of the annular side portion 32 is considerably larger than the thickness of the column portion 33. As a result, processing becomes complicated in the manufacture of the cage, and the amount of material required for manufacturing the cage increases. This limits the manufacturing cost and the weight of the cage.

In recent years, there has been a demand for an inexpensive, lightweight bearing having a large load capacity while maintaining the same performance as a conventional roller bearing. Therefore, there is a problem to be solved in that a bulge process is applied in the manufacture of a cage to provide a cage capable of further reducing the weight of the cage and manufacturing the roller bearing at a lower cost, and a method of manufacturing the same. is there.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to increase the yield when manufacturing a cage as a product from a raw material and reduce the amount of material used. As a result, it is possible to provide a cage that further reduces the weight of the cage, improves the rotational performance, and increases the load capacity of the roller bearing. In addition, it is possible to manufacture an M-shaped cage inexpensively and efficiently by a simple process. It is an object of the present invention to provide a method for manufacturing a cage.

The invention comprises a pair of opposed annular sides,
A plurality of pillars extending in parallel in the axial direction and integrally connecting the two annular side parts and formed circumferentially spaced apart from each other, and a bearing roller is provided between the adjacent pillar parts. A window for accommodating the same, the column portion is formed at a central portion in the axial direction, a column end radially deviated from the column central portion and coupled to the annular side portion. And a roller inclination retainer comprising a column inclined portion connecting the column central portion and the column end portion, wherein the annular side portion and the column portion have substantially the same thickness. .

According to this roller bearing retainer, the annular side portion and the column portion have substantially the same thickness, so that the annular side portion is formed as thin as the column portion. The so-called M-shaped cage, in which the center of the pillar is radially deviated from the end of the pillar via the inclined portion of the pillar, is further reduced in weight. It shows great rotation. Since the annular side part and the pillar part have substantially the same thickness,
The partial rigidity of the retainer is substantially uniform between the annular side portion and the column portion, and does not decrease at the column portion as compared with the annular side portion. In addition, since the annular side portion is formed to be thin like the column portion, the balance as the cage is little affected, and the roller having a long length can be incorporated into the cage, and the load capacity as a roller bearing can be reduced. growing. Further, according to the cage which is reduced in weight, less material is used, and the material cost is reduced.

In this roller bearing retainer, the central portion of the column is deviated radially inward from the column end, and the annular side portion is formed by being bent radially inward from the column end. Have been. This cage is a so-called M-shaped cage. Also, contrary to the shape of the above cage,
The retainer may be a retainer in which the column central portion is deviated radially outward from the column end, and the annular side portion is bent radially outward from the column end. is there. This retainer is a so-called inverted M-shaped retainer.

In this roller bearing retainer, the circumferential distance between the adjacent column center portions and the circumferential direction interval between the adjacent column end portions are smaller than the roller diameter of the bearing roller, and the adjacent column portions are smaller than the roller diameter of the bearing roller. The circumferential interval of the inclined portion is formed larger than the roller diameter of the bearing roller. The column center and the column end work to prevent the bearing rollers from deviating from the cage,
The column slopes serve to guide the rotation of the bearing rollers. In addition, a bend R by bulging is attached to an inner corner portion of the integral joint portion between the column end portion and the annular side portion, thereby preventing local stress of the integral joint portion.

Further, according to the present invention, a tubular metal material is formed by bulging a central portion of a tubular member radially deviated from a body end portion through a body inclined portion, and the tubular metal material is bent radially from the body end portion. And forming a plurality of windows for accommodating bearing rollers in the body of the annular member at a circumferential distance from each other. The present invention relates to a method for manufacturing a vessel.

According to the method for manufacturing a roller bearing retainer, the tubular material is formed by bulging into an annular member having a predetermined shape and an annular side portion.
According to the bulging process, an annular member as an intermediate molded product of the cage is manufactured accurately, easily, and in a clean environment by a molding die and pressure. By forming a plurality of windows circumferentially spaced in the annular member manufactured in this way, a cage as a practically finished product is manufactured.

In the method for manufacturing a roller bearing retainer, the central portion of the trunk is deviated radially inward from the end of the trunk, and the annular side portion is bent radially inward from the end of the trunk. Formed. This cage is a so-called M-shaped cage. In addition, contrary to the shape of the retainer, the retainer has a barrel central portion that is deviated radially outward from the trunk end, and the annular side portion is radially displaced from the trunk end. The cage may be formed by being bent outward. This retainer is a so-called inverted M-shaped retainer.

In the method for manufacturing a roller bearing retainer, a pillar portion is formed by punching and forming the body portion to form the window, and a pillar portion is formed on the body portion. The circumferential interval between adjacent pillar central portions formed to be left, and the circumferential interval between adjacent pillar ends formed to be left at the body end in the punching, are the same as those of the bearing roller. The circumferential distance between adjacent column inclined portions formed to be smaller than the diameter and left in the body inclined portion in the punch forming is formed larger than the roller diameter of the bearing roller.

By punching and forming the body to form the window, a pillar is formed on the body.
Circumferential spacing between adjacent pillar center portions formed at the trunk center and circumferential spacing between adjacent pillar ends formed at the trunk end are smaller than the roller diameter of the bearing roller. Since it is also small, the bearing rollers are prevented from falling off the cage in the radial direction inside and the radial direction outside. In addition, since the circumferential interval between adjacent column inclined portions formed on the body inclined portion is formed larger than the roller diameter of the bearing roller, the bearing roller is rotatably held by the column inclined portion. Is done.

In the method for manufacturing a cage for a roller bearing, the bulging is performed by disposing the tubular metal material in a female mold having a molding die corresponding to the outer shape of the cage formed therein, and having an incompressible inside. An isotropic compression tool made of an elastic body filled with a fluid is loaded inside the tubular metal material, the isotropic compression tool is axially pressed, and the isotropic compression tool is radially expanded. Pressing the tubular metal material against the forming die of the female die.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a roller bearing retainer and a method of manufacturing the same according to the present invention. FIG. 1 is a partially enlarged sectional view showing one embodiment of a roller bearing cage according to the present invention, and FIG. 2 is a partial sectional view of the roller bearing cage shown in FIG. Figure,
FIG. 3 is a cross-sectional view showing a tubular material which is a material before starting the processing of the cage in the method for manufacturing a roller bearing cage according to the present invention, and FIG. FIG. 5 is a cross-sectional view showing an intermediate molded product of a cage formed by performing bulging on the tubular material shown in FIG.
FIG. 2 is a cross-sectional view of a roller bearing retainer obtained by subjecting the intermediate molded product shown in FIG.

In the method for manufacturing a roller bearing retainer according to the present invention, first, as shown in FIG. 3, a thin metal tubular material 12 is prepared. The tubular material 12 is generally a fixed-sized thin pipe material (steel pipe) or a material obtained by pressing a steel plate into a cylindrical shape. The thickness t of the tubular material 12 is substantially the same as the thickness of the completed roller bearing retainer 1. The tubular material 12 shown in FIG.
As shown in FIG. 4, the annular member 13 having a substantially M-shaped partial cross section as a whole is formed by bulging as described later.
(Intermediate molded product).

The annular member 13 has side portions 14 at both ends in the axial direction.
And a body portion 15 that integrally connects the side portions 14 with each other. The torso portion 15 includes a torso central portion 16 deviated radially inward as viewed in a cross section including the central axis, and a
The body 14 includes a body end portion 18 which is formed by bending through the body 7 and is deflected radially outward, and the side portion 14 is formed by being bent inward in the radial direction at both body end portions 18. The roller bearing retainer 1 shown in FIG. 5 is formed by punching windows 10 which are circumferentially spaced apart in parallel with each other in the body 15 of the annular member 13 shown in FIG.
(Hereinafter, in the description of the embodiment, it is abbreviated as "cage 1".)
Is completed. The side part 14 of the annular member 13 becomes the annular side part 2 of the cage 1, and the body part 15 in which the window 10 is formed becomes the pillar part 3. In FIG. 5, the number of the windows 10 is reduced for the sake of simplicity.

The retainer 1 formed in this manner is shown in FIGS. 1 and 2 as a partially enlarged sectional view. FIG.
And a retainer 1 shown in FIG. 2 includes a pair of annular side portions 2 and 2,
A plurality of pillars 3 are formed so as to be spaced apart from each other in the circumferential direction between the annular side parts 2, and are integrally connected to the annular side parts 2. Column center part 4 of each column part 3
Is a portion formed in the body central portion 16 when the window 10 is formed in the body portion 15 of the annular member 13, and is deflected radially inward. Since the distance L1 between the opposing side surfaces 5 and 5 of the pair of circumferentially adjacent pillar central portions 4 and 4 is smaller than the roller diameter D, the pillar central portion 4 has a needle-like shape without particularly forming a projection. It has a function of preventing the rollers 11 from dropping inward in the radial direction. The column ends 6, 6 of the respective column portions 3 are portions formed on the body end 18 when the window 10 is formed in the body 15 of the annular member 13, and are formed from the column central portion 4. It is bent in the radial direction by the column inclined portion 8 and is displaced radially outward. Since the distance L2 between the circumferentially opposite side surfaces 7, 7 of the pair of adjacent column ends 6, 6 is smaller than the roller diameter D, the column ends 6 are needle rollers 1
1 has a function of preventing falling off to the outside in the radial direction. The column inclined portion 8 is a portion formed by being left on the body inclined portion 17 when the window 10 is formed in the body 15 of the annular member 13.
The distance L3 between the side surfaces 9 and 9 of the adjacent column inclined portion 8 is the roller diameter D
Since it is larger, the column inclined portion 8 loosely fits the needle roller 11 rotatably, and guides the outer peripheral portion of the needle roller 41 in contact with the roller bearing. The needle roller 11 is forcibly pushed into the window 10 from the inside of the cage 1 to be assembled with the cage 1 to complete the roller bearing with the cage.

The retainer 1 thus constructed has a so-called M-shaped holding structure in which the pillar portion 3 has a pillar center portion 4 which is radially deviated from the pillar end portion 6 via the pillar inclined portion 8. It is a vessel.
The pillar portion 3 and the annular side portion 2 have substantially the same thickness, and the annular side portion 2 is reasonably formed into a thin shape like the pillar portion 3 without difficulty. It is lightweight and, when assembled into a bearing, rotates lightly and exhibits good rotational properties.
Further, the partial rigidity of the retainer 1 is substantially uniform between the annular side portion 2 and the column portion 3, and does not significantly decrease at the column portion 3 as compared with the annular side portion 2. Therefore, it is possible to form the window 10 long in the axial direction up to the vicinity of the annular side portion 2 and to incorporate the long rollers into the retainer 1, thereby increasing the load capacity as a roller bearing. Further, according to the retainer 1 which is reduced in weight, the material to be used is small, the material cost is reduced, and the manufacturing cost can be reduced.

The retainer 1 is formed by forming a tubular material 12 having a uniform thickness t as shown in FIG. 3 into an annular member 13 having a M-shaped partial cross section as shown in FIG.
Since the annular member 13 is manufactured by forming a window in the radial direction, the metal structure is in a state of a fiber flow that is integrally connected. In the annular member 13, a bend R is naturally formed at an inner corner portion which is an integral connection portion 19 (see FIG. 4) of the side portion 14 and the body portion 15 by using a bulge processing mold. The bending R of the integral joint portion 19 is left as it is in the cage 1 as a finished product, and the integral joint portion 19 is not cracked due to local stress, and a strong integral joint portion 19 is obtained. be able to. In addition, the cage 1 is of course also used as a bearing that is assembled in a single row or a double row in the outer ring or the outer ring and the inner ring.

Next, details of the bulging process for forming the tubular material 12 shown in FIG. 3 into the annular member 13 shown in FIG.
This will be described with reference to FIGS. 6 is a perspective view showing a female mold used for bulging, FIG. 7 is a perspective view showing one split mold and a male mold of the female mold shown in FIG. 6, and FIG. 8 is shown in FIGS. 6 and 7. It is sectional drawing which shows the mode of the process of the bulge process using a type | mold.

The female mold 20 used for bulging is shown in FIG.
As shown in FIG. 8 to FIG. 8, a pair of split dies 21 and 21 are provided. On the inner circumference of the split dies 21 and 21, there is formed a molded portion 22 formed of a concave portion that matches the outer peripheral shape of the cage 1 as a finished product, that is, a substantially M-shaped shape. The split molds 21 and 21 are firmly fastened by fasteners (not shown) inserted into the fastening holes 23, and the pair of molded portions 22 in the aligned state match the outer peripheral shape of the retainer 1. As shown in FIGS. 7 and 8, the male mold 24 used for bulging is composed of an isotropic compression tool 25 made of polyurethane resin and a processing punch 26 for pressing the isotropic compression tool 25. The isotropic compression tool 25 has an incompressible fluid 2 inside.
7 comprises an elastic body 28 in which is sealed.

As the isotropic compression tool 25, the elastic body 28 in which the incompressible fluid 27 is sealed is composed of an elastic hollow body made of thermoplastic polyurethane resin in which the incompressible fluid 27 is directly sealed, and an elastic hollow body made of this elastic hollow body. And a shape-retaining elastic encapsulating body made of a thermosetting polyurethane resin forming the periphery. As this isotropic compression tool, for example, Japanese Patent Publication No. 3-5
There is one disclosed in Japanese Patent No. 6836.

The bulging is performed in the following procedure. The tubular material 12 to be processed is loaded into the forming portions 22 of the pair of split dies 21 and 21 of the female die 20 with the isotropic compression tool 25 fitted therein. The processing table 29 is formed with a slightly raised base 29a corresponding to the molding portion 22 of the female mold 20. The pair of split dies 21 and 21 assembled on the processing table 29 has a tubular material. 12 is inserted from above, so that the tubular material 1 placed on the pedestal 29a is
2 is loaded at a position corresponding to the molding portion 22 of the female mold 20. When the isotropic compression tool 25 fitted to the tubular material 12 is pressed in the axial direction by the working punch 26, the isotropic compression tool 25
Expands in the radial direction and applies a large pressure from the inside of the tubular material 12 to form a shape according to the forming portion 22 of the female mold 20 as shown in FIG.

According to this bulging process, as in the prior art,
Turning the tubular material 12 does not produce the inevitable shavings, improves the yield, and reduces the amount of metal material consumed. The molding jig is a female mold 20
The mold consists of only a split mold 21 as a mold, and an isotropic compression tool 25 made of a polyurethane resin as a male mold 24. The molding operation can be performed simply by pressing the isotropic compression tool 25. In a short time. In the above example, a so-called M-shaped cage is manufactured. However, by inverting the shape of the molding die 22 of the female mold 20, a so-called inverted M-shaped cage can be manufactured. Needless to say, there is.

[0031]

According to the roller bearing retainer and the method of manufacturing the same according to the present invention, a metal tubular material is formed into a body having a predetermined shape and an annular side by bulging using a forming die and pressure. Since it is molded into an annular member consisting of a part, an annular member as an intermediate molded product of the cage is manufactured,
By forming a plurality of windows circumferentially spaced in the annular member, the cage can be manufactured accurately, easily, and in a clean environment. Therefore, in the manufacture of conventional cages, conventional machining without using machining oil or machine tools that generate shavings or cold rolling using large machine tools with rotating parts It is possible to manufacture an inexpensive cage having performance equal to or higher than that of the above cage. In addition, since the retainer manufactured in such a manner is formed such that the thickness of the annular side portion is as thin as the thickness of the column portion, it is possible to obtain a lightweight and highly rotatable retainer. It is also possible to increase the load capacity of the roller bearing obtained by incorporating the rollers in the container. Furthermore, the roller bearing retainer according to the present invention is formed by uniform pressure by bulge processing even when compared with a retainer manufactured by roll forming, so that the retainer has high roundness and is formed by roll forming. The finished surface is smooth with no trace of time.

[Brief description of the drawings]

FIG. 1 is a partially enlarged sectional view showing one embodiment of a roller bearing retainer according to the present invention.

FIG. 2 is a partial cross-sectional view of the roller bearing retainer shown in FIG. 1 taken along the line AA in FIG.

FIG. 3 is a cross-sectional view showing a tubular material which is a material before starting to process the cage in the method for manufacturing a roller bearing cage according to the present invention.

FIG. 4 is a cross-sectional view showing an intermediate molded product of the cage formed by subjecting the tubular material shown in FIG. 1 to bulging in the method of manufacturing a roller bearing cage according to the present invention.

FIG. 5 is a cross-sectional view of a roller bearing retainer obtained by punching a window into the intermediate molded product shown in FIG. 4 to obtain a finished product.

FIG. 6 is a perspective view showing a female mold used in the method of manufacturing a retainer according to the present invention.

FIG. 7 is a perspective view showing one split mold and a male mold of the female mold shown in FIG. 6 separately.

8 is a cross-sectional view showing a state of a bulging process using the mold shown in FIGS. 6 and 7. FIG.

FIG. 9 is a partial cross-sectional view of a retainer used for a conventional needle roller bearing.

FIG. 10 is a sectional view of the retainer shown in FIG.

11 is a top view of the retainer shown in FIG. 10 as viewed from the direction of arrow C.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cage 2 Ring side part 3 Column part 4 Column center part 6 Column end part 8 Column inclination part 10 Window 11 Needle roller 12 Tubular material 13 Ring member 14 Side part 15 Body part 16 Body center part 17 Body inclination part 18 Body End 19 Integrally connected part 20 Female mold 21 Split mold 22 Molded part 24 Male mold 25 Isotropic compression tool 27 Incompressible fluid 28 Elastic body L1 Distance between column center portions L2 Distance between column end portions L3 ..Distance between pillar slopes

Claims (10)

[Claims] 1. A pair of opposed annular side portions, and a plurality of pillar portions extending in parallel in the axial direction, integrally connecting the two annular side portions, and formed at circumferentially spaced intervals from each other. A window for accommodating a bearing roller is formed between the adjacent column portions, and the column portion is formed in a central portion in the axial direction, a column central portion, and a radial direction with respect to the column central portion. A column end that is displaced and connected to the annular side portion, and a column inclined portion that connects the column center portion and the column end portion, wherein the annular side portion and the column portion are substantially the same. A roller bearing retainer having a thickness of 2. The method according to claim 1, wherein the pillar center portion is deviated radially inward from the pillar end portion, and the annular side portion is formed by being bent radially inward from the pillar end portion. The cage for a roller bearing according to claim 1. 3. The column center portion is deviated radially outward from the column end portion, and the annular side portion is formed by being bent radially outward from the column end portion. The cage for a roller bearing according to claim 1. 4. A circumferential interval between adjacent column central portions and a circumferential interval between adjacent column end portions are smaller than a roller diameter of the bearing roller, and a circumferential interval between adjacent column inclined portions. The roller bearing retainer according to any one of claims 1 to 3, wherein the roller is formed to be larger than a roller diameter of the bearing roller. 5. The method according to claim 1, wherein an inner corner portion of the integrally joined portion between the pillar end portion and the annular side portion has a bend R by bulging. Roller bearing cage. 6. A torso portion in which a central portion of the torso is radially deviated from a torso end portion through a torso portion by bulging a tubular metal material, and an annular side bent radially from the torso end portion. And forming a plurality of windows for accommodating bearing rollers in the body of the annular member at circumferentially spaced intervals. . 7. The torso central part is deviated radially inward from the torso end, and the annular side part is formed by being bent radially inward from the torso end. Item 7. A method for manufacturing a roller bearing retainer according to Item 6. 8. The torso center portion is deviated radially outward from the torso end, and the annular side portion is formed by being bent radially outward from the torso end. Item 7. A method for manufacturing a roller bearing retainer according to Item 6. 9. A pillar portion is formed by punching and forming the body portion to form the window, while leaving a pillar portion on the body portion.
Circumferential spacing between adjacent pillar central portions formed by being left at the trunk center portion in the punch forming, and circumferential spacing between adjacent pillar end portions formed by being left at the barrel end portion during the punch forming. Is smaller than the roller diameter of the bearing roller, and the circumferential interval between adjacent column inclined portions formed by being left on the body inclined portion in the punching is larger than the roller diameter of the bearing roller. The method for manufacturing a roller bearing cage according to any one of claims 6 to 8, wherein the cage is formed. 10. The bulging process includes disposing the tubular metal material in a female mold in which a molding die corresponding to the outer shape of the retainer is formed, and forming an elastic body having an incompressible fluid sealed therein. The isotropic compression tool is loaded inside the tubular metal material, the isotropic compression tool is pressurized in the axial direction, and the isotropic compression tool is radially expanded to form the tubular metal material into the female mold. The method for manufacturing a roller bearing retainer according to any one of claims 6 to 9, comprising pressing against the forming die.