Rolling bearing manufacturing method

Abstract

The present disclosure relates to a method for manufacturing a rolling bearing provided with a retainer. A retainer (6) has a first annular component (10) and a second annular component (12). The second annular component (12) includes a plurality of plate-form members (20) and a plurality of rod-form parts (22) that connect the plurality of plate-form members (20) in an annular manner. End surfaces (36) of the plate-form members (20) each have a first chamfered part (36b). The rod-form parts (22) each have a first inclined surface (41), a second inclined surface (42), and a first convex curved surface part (43) that joins an edge (41a) of the first inclined surface (41) and an edge (42a) of the second inclined surface (42) at the radial-direction widthwise center of a first surface (40). A circumferential-direction end (43a) of the first convex curved surface part (43) is joined to the first chamfered part (36b). In this manufacturing method, the rod-form parts (22), and outer hooks (30) and inner hooks (32) of holding parts (28) of the first annular component (10), are butted against each other, the first annular component (10) and the second annular component (12) are pressed against each other in the axial direction, and the rod-form parts (22) are held between the holding parts (28).

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a rolling bearing. [Background technology]

[0002] A conventional wave reducer includes a flexspline, a cam, and a rolling bearing. The rolling bearing is provided between the flexspline and the cam. The rolling bearing is, for example, a ball bearing. The rolling bearing used in the strain wave reducer includes a so-called mating cage that is assembled by combining a pair of annular bodies. The mating cage is made up of two annular parts (see, for example, Patent Document 1).

[0003] FIG. 10 is a diagram showing a conventional cage. The cage is made of resin and includes a first annular component 100 and a second annular component 102. The first annular component 100 has an annular body 104 and a plurality of pillars 106. The plurality of pillars 106 are provided so as to protrude from the side surface of the annular body 104. Each of the tips of the plurality of posts 106 has a pair of engaging claws 108 . The second annular component 102 has a plurality of plate-like members 110 and a plurality of rod-like portions 112. The plurality of plate-like members 110 are arranged at equal intervals in the circumferential direction of the second annular component 102. The rod-like portions 112 connect adjacent pairs of the plurality of plate-like members 110 in an annular shape. The rod-like portions 112 are connected to the end faces in the circumferential direction of the pair of adjacent plate-like members 110.

[0004] Each of the rod-shaped portions 112 is fitted into a pair of engaging claws 108. The pair of engaging claws 108 holds the rod-shaped portion 112 between them. The first annular part 100 and the second annular part 102 are joined together by fitting the rod-shaped part 112 into the pair of engaging claws 108. The space defined by the annular body 104, the second annular part 102, and the multiple posts 106 is a pocket that holds the rolling elements. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 5-47544 Summary of the Invention [Problem to be solved by the invention]

[0006] The conventional cage described above is assembled as follows: The first annular component 100 and the second annular component 102 are positioned circumferentially and radially by abutting the pair of engaging claws 108 and the rod-shaped portion 112 against each other. The first annular component 100 and the second annular component 102 are pressed relative to each other in the axial direction. The rod-shaped portion 112 is fitted into the engaging claws 108.

[0007] At this time, if misalignment occurs between the first annular part 100 and the second annular part 102 in the circumferential and radial directions, the edges of the circumferential ends of the engaging claws 108 come into contact with the edges of the circumferential edges of the pair of plate-like members 110 adjacent to the rod-like part 112. When misalignment occurs, the edges of the circumferential edges of the engaging claws 108 and the edges of the circumferential edges of the plate-like members 110 may gall. Such galling can cause poor bonding between the first annular component 100 and the second annular component 102. Furthermore, if the engaging claws 108 are forcibly fitted into the rod-shaped portion 112 when galling has occurred, the circumferential edges of the engaging claws 108 and / or the circumferential edges of the plate-shaped member 110 may be torn off, which could damage the appearance. For these reasons, it is necessary to suppress the occurrence of galling in conventional cages. [Means for solving the problem]

[0008] An embodiment according to the present disclosure is a method for manufacturing a rolling bearing including an inner ring, an outer ring, multiple rolling elements, and a cage that holds the multiple rolling elements. The cage includes a first annular component and a second annular component. The first annular component includes an annular body having a side surface facing a first axial direction of the first annular component, and multiple pillars disposed on the side surface and extending in the axial direction. The second annular component includes multiple plate-shaped members arranged at equal intervals in the circumferential direction and multiple rod-shaped members that connect the multiple plate-shaped members in an annular shape. The multiple pillars include multiple main body portions extending from the side surface and multiple clamping portions disposed at the tips of the multiple main body portions. Each of the clamping portions includes a radially outer outer claw protruding from the tip of the main body portion and a radially inner inner claw protruding from the tip of the main body portion for clamping the rod-shaped member between the outer claw and the main body portion. Each of the rod-shaped members is connected to a pair of end faces of a pair of adjacent plate-shaped members among the multiple plate-shaped members. Each of the pair of end faces has a flat portion facing the other end face and a first chamfered portion connecting the flat portion to a first side surface of the plate-like member facing a first axial side of the second annular component. The rod-shaped portion has a first surface facing the first axial side of the second annular component between the pair of end faces. The first surface has a first inclined surface that slopes from the first axial side to the second axial side of the second annular component as it extends radially outward from the radial width center of the first surface, a second inclined surface that slopes from the first axial side to the second axial side of the second annular component as it extends radially inward from the radial width center of the first surface, and a first convex curved surface portion that connects an edge of the first inclined surface to an edge of the second inclined surface at the radial width center of the first surface. A circumferential end of the first convex curved surface portion is connected to the first chamfered portion. In this manufacturing method, the central axis of the first annular part is aligned with the central axis of the second annular part, and a first axial side of the first annular part is opposed to a first axial side of the second annular part, and then the outer claws and inner claws of each of the multiple clamping parts are butted against the rod-shaped parts, and the first annular part and the second annular part are pressed against each other in the axial direction, so that the rod-shaped parts are clamped by the multiple clamping parts. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to suppress galling that occurs during assembly of the cage. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view of a rolling bearing. [Figure 2] FIG. 2 is a perspective view of the cage. [Figure 3] FIG. 3 is an exploded perspective view of the cage. [Figure 4] FIG. 4 is a partially enlarged view of the first annular part. [Figure 5] FIG. 5 is an enlarged view of the second annular component as viewed from the axial direction. [Figure 6] FIG. 6 is an enlarged perspective view of the second annular part. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. [Figure 8A] FIG. 8A is a diagram for explaining the method for manufacturing the rolling bearing according to this embodiment. [Figure 8B] FIG. 8B is a diagram for explaining the method for manufacturing the rolling bearing according to this embodiment. [Figure 9A] FIG. 9A is a cross-sectional view taken along the radial direction when the clamping portion and the rod-shaped portion are butted against each other. [Figure 9B] FIG. 9B is a diagram of the clamping portion and the rod-shaped portion when they are butted against each other, as viewed from the radial direction. [Figure 10] FIG. 10 is a diagram showing a conventional cage. DETAILED DESCRIPTION OF THE INVENTION

[0011] First, the contents of the embodiment will be listed and explained. [Outline of the embodiment] (1) An embodiment according to the present disclosure is a method for manufacturing a rolling bearing including an inner ring, an outer ring, a plurality of rolling elements, and a cage that holds the plurality of rolling elements. The cage includes a first annular component and a second annular component. The first annular component includes an annular body having a side surface facing a first axial direction of the first annular component, and a plurality of pillars disposed on the side surface and extending in the axial direction. The second annular component includes a plurality of plate-shaped members arranged at equal intervals in the circumferential direction, and a plurality of rod-shaped members that connect the plurality of plate-shaped members in an annular shape. The plurality of pillars include a plurality of main body portions extending from the side surface, and a plurality of clamping portions disposed at the tips of the main body portions. Each of the clamping portions includes a radially outer outer claw that protrudes from the tip of the main body portion, and a radially inner inner claw that protrudes from the tip of the main body portion and clamps the rod-shaped member between the outer claw and the rod-shaped member. Each of the rod-shaped portions is connected to a pair of end surfaces of a pair of adjacent plate-shaped members among the plurality of plate-shaped members. Each of the pair of end surfaces has a flat portion facing the other end surface and a first chamfered portion connecting the flat portion to a first side surface of the plate-shaped member facing a first axial side of the second annular component. The rod-shaped portion has a first surface facing the first axial side of the second annular component between the pair of end surfaces. The first surface has a first inclined surface that inclines from the first axial side to the second axial side of the second annular component as it extends radially outward from the radial width center of the first surface, a second inclined surface that inclines from the first axial side to the second axial side of the second annular component as it extends radially inward from the radial width center of the first surface, and a first convex curved surface portion that connects an edge of the first inclined surface to an edge of the second inclined surface at the radial width center of the first surface. In this manufacturing method, the central axis of the first annular component is aligned with the central axis of the second annular component, a first axial side of the first annular component is opposed to a first axial side of the second annular component, the outer claws and inner claws of each of the plurality of clamping parts are butted against the rod-shaped parts, and the first annular component and the second annular component are pressed against each other in the axial direction to clamp the rod-shaped parts between the plurality of clamping parts.

[0012] According to the above configuration, when the outer and inner claws of the clamping part are butted against the rod-shaped part, the first convex curved surface and the subsequent first and second inclined surfaces slide against the outer and inner claws. This allows the relative radial position between the clamping part and the rod-shaped part to be appropriately adjusted. Furthermore, the outer and inner claws elastically deform, widening the gap between the outer and inner claws. When the rod-shaped part then passes between the tips of the outer and inner claws, the rod-shaped part is clamped between the outer and inner claws. According to the above configuration, the circumferential ends of the first convex curved surface portions are connected to the first chamfered portions of the pair of adjacent plate-like members, so that when the outer and inner claws of the clamping part are butted against the rod-like part, the outer and inner claws come into contact with the first chamfered portions before the outer and inner claws are expanded by the first inclined surfaces and the second inclined surfaces. Therefore, even if a slight misalignment occurs between the clamping portion and the rod-shaped portion in the circumferential direction, the outer and inner claws and the first chamfered portion slide against each other, and the clamping portion and the rod-shaped portion move relatively in the circumferential direction, adjusting their relative positions in the circumferential direction, thereby properly guiding the clamping portion and the rod-shaped portion into the space between a pair of adjacent plate-shaped members. In other words, when assembling the retainer, the first annular part and the second annular part are pressed against each other, and when the outer claws and inner claws are expanded by the first inclined surface and the second inclined surface, the relative circumferential position between the clamping portion and the rod-shaped part has already been appropriately adjusted, so that the outer claws, inner claws and rod-shaped part can be prevented from being pushed in out of alignment with each other, and galling can be prevented from occurring between the outer claws, inner claws and plate-shaped member.

[0013] (2) In the above-mentioned method for manufacturing a rolling bearing, it is preferable that the first side surface and the top of the first convex curved surface portion are aligned in the axial direction. In this case, when the outer claws and inner claws of the clamping portion are butted against the rod-shaped portion, the outer claws and inner claws can come into contact with the first chamfered portion at an earlier stage. This allows the outer claws and inner claws to more reliably contact the first chamfered portion before the outer claws and inner claws are expanded.

[0014] (3) In the method for manufacturing a rolling bearing described above, each of the pair of end faces further has a second chamfered portion connecting the flat portion to a second side surface of the plate-like member facing a second axial side of the second annular component. The rod-shaped component has a second surface facing the second axial side of the second annular component between the pair of end faces. The second surface has a third inclined surface that inclines from the second axial side to the first axial side of the second annular component as it extends radially outward from a center of the radial width of the second surface, a fourth inclined surface that inclines from the second axial side to the first axial side of the second annular component as it extends radially inward from the center of the width, and a second convex curved surface portion that connects an edge of the third inclined surface to an edge of the fourth inclined surface at the center of the radial width of the second surface. In the aforementioned configuration, a circumferential end of the second convex curved surface portion may be connected to the second chamfered portion.

[0015] In this case, the first axial side and the second axial side of the second annular component have the same configuration. Therefore, even if the first axial side of the first annular component and the second axial side of the second annular component are mistakenly opposed to each other and the first and second annular components are pressed in the axial direction, the rod-shaped component can be clamped by the clamping component while preventing galling between the outer claws and the plate-shaped component and between the inner claws and the plate-shaped component.

[0016] [Details of the embodiment] Preferred embodiments will now be described with reference to the drawings. [Regarding rolling bearings and cages] FIG. 1 is a cross-sectional view of a rolling bearing. In Fig. 1, the rolling bearing 1 is a ball bearing used in a wave reducer. In addition to the rolling bearing 1, the wave reducer is equipped with a circular spline, a flexspline, and a cam. The cam is provided on the inner periphery of the flexspline. The rolling bearing 1 is disposed between the flexspline and the cam.

[0017] The rolling bearing 1 includes an inner ring 2 , an outer ring 3 , a plurality of balls 4 , and a cage 6 . The inner ring 2 and the outer ring 3 are made of metal (steel) such as bearing steel. The balls 4 are also made of metal (steel), for example, bearing steel. The inner ring 2 has a raceway groove 2a on its outer peripheral surface, the cross section of which is arc-shaped. The outer ring 3 has a raceway groove 3a on its inner peripheral surface, the cross section of which is arc-shaped. The balls 4 are interposed between the raceway grooves 2a and 3a so as to be able to roll freely. The cage 6 holds the balls 4 at regular intervals in the circumferential direction.

[0018] The cage 6 has a plurality of pockets 7 for accommodating a plurality of balls 4. The plurality of pockets 7 are provided at equal intervals in the circumferential direction.

[0019] Fig. 2 is a perspective view of the cage 6. Fig. 3 is an exploded perspective view of the cage 6. The cage 6 is made of, for example, resin. The cage 6 is obtained by injection molding. The cage 6 has a first annular component 10 and a second annular component 12. The cage 6 is assembled by combining the first annular component 10 and the second annular component 12 together. In other words, the cage 6 is a so-called mating cage. The first annular component 10 and the second annular component 12, both made of resin, are each obtained by injection molding. In FIG. 3, the central axis of the first annular part 10 and the central axis of the second annular part 12 coincide with the central axis C.

[0020] As shown in FIG. 3, the first annular component 10 has an annular body 14 and a plurality of posts 16 . The annular body 14 has a side surface 14a that faces the first axial side 10a of the first annular component 10. 2 and 3, the axial direction of the first annular part 10 refers to the direction parallel to the central axis C of the first annular part 10 (annular body 14). The radial direction of the first annular part 10 refers to the direction perpendicular to the central axis C. The circumferential direction refers to the direction along a circle centered on the central axis C. The first axial side 10a of the first annular part 10 refers to the side on which multiple pillars 16 are provided, of both sides of the first annular part 10 facing the axial direction.

[0021] The plurality of pillars 16 are provided on the side surface 14a of the annular body 14. The plurality of pillars 16 are provided at equal intervals along the circumferential direction. The plurality of pillars 16 extend in the axial direction. The space surrounded by the annular body 14, the plurality of posts 16, and the second annular part 12 constitutes the pocket 7.

[0022] The second annular part 12 has a plurality of plate-shaped members 20 and a plurality of rod-shaped portions 22. The number of plate-shaped members 20 and the number of rod-shaped portions 22 are the same. The plurality of plate-like members 20 are arranged at equal intervals along the circumferential direction of the second annular part 12. 2 and 3, the circumferential direction of the second annular component 12 refers to the direction along a circle centered on the central axis C of the second annular component 12. The radial direction refers to the direction perpendicular to the central axis C. The axial direction refers to the direction parallel to the central axis C. The first axial side 12a of the second annular component 12 refers to one of the two axial sides of the second annular component 12. The second axial side 12b of the second annular component 12 refers to the other axial side of the second annular component 12. In FIG. 3, a first axial side 10a of the first annular component 10 and a second axial side 12a of the second annular component 12 face each other.

[0023] The plurality of rod-shaped portions 22 connect the plurality of plate-shaped members 20 in a ring shape. Each of the plurality of rod-shaped portions 22 is disposed between a pair of adjacent plate-shaped members 20 among the plurality of plate-shaped members 20. The rod-shaped portions 22 connect the pair of adjacent plate-shaped members 20 to each other.

[0024] FIG. 4 is a partially enlarged view of the first annular part 10. As shown in FIG. As shown in FIG. 4, each pillar 16 has a main body portion 26 and a clamping portion 28. The main body 26 is a columnar member extending axially from the side surface 14a. The clamping portion 28 is provided at the tip 26a of the main body portion 26. The clamping portion 28 has an outer claw 30 and an inner claw 32. The outer claws 30 are provided radially outward from the tip 26a, and the inner claws 32 are provided radially inward from the tip 26a. The clamping portion 28 clamps the rod-shaped portion 22 between the outer claws 30 and the inner claws 32. The inner surface 30b on the radially inner side of the outer claws 30 and the inner surface 32b on the radially outer side of the inner claws 32 are combined with each other to form a cylindrical surface. The inner surface 30b and the inner surface 32b are sized to be able to contact and clamp the outer periphery of the rod-shaped portion 22. Furthermore, the distance between the tip end 30a of the outer claw 30 and the tip end 32a of the inner claw 32 is slightly narrower than the thickness of the rod-shaped portion 22. Therefore, when the rod-shaped portion 22 is clamped between the outer claw 30 and the inner claw 32, the rod-shaped portion 22 is held by the outer claw 30 and the inner claw 32 so as not to come off.

[0025] Fig. 5 is an enlarged view of the second annular component 12 as viewed from the axial direction. Fig. 6 is an enlarged perspective view of the second annular component 12. Fig. 5 shows the first axial side 12a of the second annular component 12. The second axial side 12b of the second annular component 12 has the same configuration as the first axial side 12a of the second annular component 12. As described above, the rod-shaped portions 22 connect a pair of adjacent plate-shaped members 20. The rod-shaped portions 22 are connected to a pair of end faces 36 of the pair of plate-shaped members 20. The end faces 36 are located on both sides of the plate-shaped members 20 in the circumferential direction.

[0026] The end face 36 of each plate-shaped member 20 has a flat portion 36a and a first chamfered portion 36b. The flat portion 36a is a flat portion facing the other end face 36. The first chamfered portion 36b connects the first side surface 20a of the plate-shaped member 20 and the flat portion 36a via a convex curved surface. The first side surface 20a is a side portion of the plate-shaped member 20 that faces the first axial side 12a of the second annular component 12. The first chamfered portion 36b has a rounded chamfered shape that connects the first side surface 20a and the flat surface portion 36a. Of course, the first chamfered portion 36b is formed by injection molding, just like the first side surface 20a and the flat surface portion 36a.

[0027] Fig. 7 is a cross-sectional view taken along line VII-VII in Fig. 5. In Fig. 7, the right side of the paper is the radially inner side of the second annular part 12, and the left side of the paper is the radially outer side. 7, the end surface 36 further has a second chamfered portion 36c. The second chamfered portion 36c connects the second side surface 20b and the flat portion 36a of the plate-shaped member 20 via a convex curved surface. The second side surface 20b is a side surface portion of the plate-shaped member 20 that faces the second axial side 12b of the second annular part 12. The second chamfered portion 36c has a rounded chamfered shape that connects the second side surface 20b and the flat surface portion 36a. Of course, the second chamfered portion 36c is formed by injection molding, just like the second side surface 20b and the flat surface portion 36a. Note that there is also a rounded chamfer between the flat portion 36a and the other side surfaces other than the first side surface 20a and the second side surface 20b.

[0028] 7, the rod-shaped portion 22 is a rod-shaped member. The cross-sectional shape of the rod-shaped portion 22 is square overall, with the corners of the square replaced by convex curves. In other words, each ridge portion of the rod-shaped portion 22 has an R-shape. Between the pair of end faces 36, the rod-shaped portion 22 has a first surface 40, a second surface 50, and a pair of side surfaces 52. The first surface 40 faces the first axial side 12a of the second annular component 12. The second surface 50 faces the second axial side 12b of the second annular component 12. The pair of side surfaces 52 are rounded surfaces that connect the first surface 40 and the second surface 50. The distance between the pair of side surfaces 52 is set to be greater than the distance between the tip end 30a of the outer claw 30 and the tip end 32a of the inner claw 32.

[0029] The first surface 40 has a first inclined surface 41, a second inclined surface 42, and a first convex curved surface portion 43. The first inclined surface 41 is an inclined surface that inclines from the first axial side 12a to the second axial side 12b of the second annular component 12 as it moves radially outward from the center of the radial width of the first surface 40. The second inclined surface 42 is an inclined surface that inclines from the first axial side 12a to the second axial side 12b of the second annular component 12 as it moves radially inward from the center of the radial width of the first surface 40. The first convex curved surface portion 43 is a convex curved surface that connects the edge portion 41a of the first inclined surface 41 and the edge portion 42a of the second inclined surface 42 at the center of the radial width of the first surface 40. The first convex curved surface portion 43 is a ridge portion of the rod-shaped portion 22, which is rounded.

[0030] As shown in FIGS. 5 and 6, a circumferential end 43a of the first convex curved surface portion 43 is connected to the first chamfered portion 36b. As shown in FIG. 7, the top 43b of the first convex curved surface portion 43 and the first side surface 20a are aligned in the axial direction.

[0031] As shown in FIG. 7, the second surface 50 has a third inclined surface 46, a fourth inclined surface 47, and a second convex curved surface portion . The third inclined surface 46 is an inclined surface that inclines from the second axial side 12b to the first axial side 12a of the second annular component 12 as it moves radially outward from the center of the radial width of the second surface 50. The fourth inclined surface 47 is an inclined surface that inclines from the second axial side 12b to the first axial side 12a of the second annular component 12 as it moves radially inward from the center of the radial width of the second surface 50. The second convex curved surface portion 48 is a convex curved surface that connects the edge portion 46a of the third inclined surface 46 and the edge portion 47a of the fourth inclined surface 47 at the center of the radial width of the second surface 50. The second convex curved surface portion 48 is a ridge portion of the rod-shaped portion 22, which is rounded.

[0032] Similar to the end 43a of the first convex curved surface portion 43, the circumferential end of the second convex curved surface portion 48 is connected to the second chamfered portion 36c. As shown in FIG. 7, the top 48b of the second convex curved surface portion 48 and the second side surface 20b are aligned in the axial direction.

[0033] [Regarding the manufacturing method of rolling bearings] 8A and 8B are diagrams for explaining a method for manufacturing the rolling bearing 1 according to this embodiment. When manufacturing the rolling bearing 1, first, an assembly A and a second annular component 12 are prepared, as shown in Fig. 8A. The assembly A includes an inner ring 2, an outer ring 3, and a first annular component 10. Each pillar 16 is disposed between each ball 4. Next, the central axis of the second annular component 12 is aligned with the central axis of the first annular component 10 included in the assembly A. The first axial side 12a of the second annular component 12 is opposed to the first axial side 10a of the first annular component 10. In this state, the rod-shaped portion 22 is placed between the tip ends 30a of the outer claws 30 and the tip ends 32a of the inner claws 32 of the clamping unit 28. In other words, the central axis of the first annular member 10 included in the assembly A is aligned with the central axis of the second annular member 12, the first axial side 10a of the first annular member 10 is opposed to the first axial side 12a of the second annular member 12, and the outer claws 30 and inner claws 32 of the clamping portion 28 are butted against the rod-shaped portion 22.

[0034] Next, the second annular part 12 is pressed axially against the first annular part 10 and inserted between the outer claws 30 and the inner claws 32. As shown in FIG. 8B , the rod-shaped part 22 is sandwiched between the inner surfaces 30b of the outer claws 30 and the inner surfaces 32b of the inner claws 32. That is, the first annular member 10 and the second annular member 12 are pressed against each other in the axial direction, and the rod-shaped portion 22 is clamped by the clamping portion 28, as shown in FIG. 8B. By this manufacturing method, the first annular component 10 and the second annular component 12 are integrally combined with each other. By this manufacturing method, the rolling bearing 1 includes the cage 6 assembled.

[0035] 9A is a cross-sectional view taken along the radial direction when the clamping portion 28 and the rod-shaped portion 22 are butted against each other. That is, Fig. 9A shows a cross-section taken along the radial direction of the rod-shaped portion 22 placed between the tip end 30a of the outer claw 30 and the tip end 32a of the inner claw 32 of the clamping portion 28. When the rod-shaped portion 22 is placed between the tip portions 30a of the outer claws 30 and the tip portions 32a of the inner claws 32 of the clamping portion 28 and pressed, the first convex curved surface portion 43 and the first inclined surface 41 and second inclined surface 42 connected thereto come into sliding contact with the outer claws 30 and the inner claws 32. The outer claws 30 and the inner claws 32 elastically deform so as to move away from each other, and the gap between the tip portions 30a of the outer claws 30 and the tip portions 32a of the inner claws 32 expands. Thereafter, when the rod-shaped portion 22 passes between the tip portions 30a of the outer claws 30 and the tip portions 32a of the inner claws 32, the rod-shaped portion 22 is clamped between the outer claws 30 and the inner claws 32. When the rod-shaped portion 22 is clamped between the outer claws 30 and the inner claws 32 , the first convex curved surface portion 43 and the pair of side surfaces 52 abut against the inner surfaces 30 b of the outer claws 30 and the inner surfaces 32 b of the inner claws 32 .

[0036] Thus, in this embodiment, when the rod-shaped portion 22 is placed between the outer claws 30 and inner claws 32 of the clamping portion 28 and pressed, the first convex curved surface portion 43 and the first inclined surface 41 and second inclined surface 42 that follow therefrom come into sliding contact with the outer claws 30 and inner claws 32. Therefore, even if the position of the rod-shaped portion 22 is slightly misaligned in the radial direction with respect to the clamping portion 28, the rod-shaped portion 22 moves relative to the clamping portion 28 along the radial direction, and the radial position of the rod-shaped portion 22 relative to the clamping portion 28 is appropriately adjusted. That is, in this embodiment, when the outer claws 30 and inner claws 32 of the clamping portion 28 are butted against the rod-shaped portion 22, the first convex curved surface portion 43 and the first inclined surface 41 and second inclined surface 42 that follow therefrom come into sliding contact with the outer claws 30 and inner claws 32. Therefore, even if a slight radial misalignment occurs between the clamping portion 28 and the rod-shaped portion 22, the clamping portion 28 and the rod-shaped portion 22 move relatively along the radial direction, and the relative radial positions are appropriately adjusted.

[0037] 9B is a view of the clamping portion 28 and the rod-shaped portion 22 when they are butted against each other, as viewed from the radial direction. That is, FIG. 9B shows the appearance of the rod-shaped portion 22 when placed between the tip end 30a of the outer claw 30 and the tip end 32a of the inner claw 32 of the clamping portion 28, as viewed from the radial direction. In this embodiment, the circumferential end 43a of the first convex curved surface portion 43 is connected to the first chamfered portion 36b of the plate-like member 20. Therefore, when the rod-like portion 22 is placed on the outer claws 30 and inner claws 32 of the clamping unit 28, the first chamfered portion 36b may come into contact with the outer claws 30 and inner claws 32. In this way, even if the rod-shaped portion 22 is slightly misaligned in the circumferential direction relative to the clamping portion 28, when the rod-shaped portion 22 is pressed axially against the first annular component 10, the first chamfered portion 36b slides against the outer claws 30 and the inner claws 32, and the rod-shaped portion 22 moves relative to the clamping portion 28 in the circumferential direction, so that each rod-shaped portion 22 is placed between the tip ends 30a of the outer claws 30 and the tip ends 32a of the inner claws 32 of the clamping portion 28. Then, the rod-shaped portion 22 passes between the tip ends 30a of the claws 30 and the tip ends 32a of the inner claws 32, and the rod-shaped portion 22 is clamped between the outer claws 30 and the inner claws 32.

[0038] That is, in this embodiment, the circumferential end 43a of the first convex curved surface portion 43 is connected to the first chamfered portion 36b of the plate-shaped member 20. Therefore, when the outer claws 30 and inner claws 32 of the clamping portion 28 are abutted against the rod-shaped portion 22, the outer claws 30 and inner claws 32 come into contact with the first chamfered portion 36b before the outer claws 30 and inner claws 32 are expanded by the first inclined surface 41 and the second inclined surface 42. Therefore, even if a slight misalignment occurs between the clamping portion 28 and the rod-shaped portion 22 in the circumferential direction, the outer claws 30 and inner claws 32 and the first chamfered portion 36b slide against each other, and the clamping portion 28 and the rod-shaped portion 22 move relatively in the circumferential direction, adjusting their relative positions in the circumferential direction. As a result, the clamping portion 28 and the rod-shaped portion 22 are properly guided into the space between a pair of adjacent plate-shaped members 20.

[0039] In other words, with this manufacturing method, when assembling the retainer 6, when the second annular part 12 is pressed against the first annular part 10 and the outer claws 30 and inner claws 32 are expanded by the first inclined surface 41 and the second inclined surface 42, the position of the rod-shaped part 22 relative to the clamping part 28 has already been appropriately adjusted in the circumferential and radial directions, so that the rod-shaped part 22 can be prevented from being pushed in while remaining misaligned relative to the outer claws 30 and inner claws 32, and the outer claws 30 and inner claws 32 and the plate-shaped member 20 can be prevented from being forcibly pressed against each other, and galling can be prevented from occurring in at least one of the outer claws 30, inner claws 32 and plate-shaped member 20. In other words, when assembling the retainer 6, the first annular part 10 and the second annular part 12 are pressed against each other, and the outer claws 30 and the inner claws 32 are expanded by the first inclined surface 41 and the second inclined surface 42, the relative position between the clamping portion 28 and the rod-shaped portion 22 has already been appropriately adjusted in the circumferential and radial directions, so that the outer claws 30 and the inner claws 32 and the rod-shaped portion 22 can be prevented from being pushed in out of alignment with each other, and galling can be prevented from occurring between the outer claws 30 and the inner claws 32 and the plate-shaped member 20.

[0040] Furthermore, in this embodiment, as shown in Figure 7, the first side surface 20a of the plate-shaped member 20 and the apex 43b of the first convex curved portion 43 are aligned in the axial direction, so the plate-shaped member 20 can move from a state in which it is in contact with the tip end 30a of the outer claw 30 and / or the tip end 32a of the inner claw 32 of the clamping portion 28 to a state in which the rod-shaped portion 22 is placed between the tip end 30a of the outer claw 30 and the tip end 32a of the inner claw 32 of the clamping portion 28, while changing the posture of the second annular part 32 relatively smoothly.

[0041] Furthermore, in this embodiment, as shown in Figure 7, the first side surface 20a of the plate-shaped member 20 and the apex 43b of the first convex curved surface portion 43 are aligned in the axial direction, so when the outer claws 30 and inner claws 32 of the clamping portion 28 are butted against the rod-shaped portion 22, the outer claws 30 and inner claws 32 can come into contact with the first chamfered portion 36b at an earlier stage. This allows the outer claws 30 and inner claws 32 to more reliably contact the first chamfered portions 36b before the outer claws 30 and inner claws 32 are expanded.

[0042] Furthermore, in this embodiment, the circumferential end of the second convex curved surface portion 48 on the second axial side 12b of the second annular component 12 is connected to the second chamfered portion 36c, similar to the end 43a of the first convex curved surface portion 43. Therefore, even if the first axial side 10a of the first annular component 10 and the second axial side 12b of the second annular component 12 are opposed to each other and the first annular component 10 and the second annular component 12 are pressed in the axial direction, the rod-shaped portion 22 can be clamped by the clamping portion 28 while suppressing galling between the outer claws 30 and the inner claws 32 and the plate-shaped member 20.

[0043] 〔others〕 The embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is not limited to the above-described embodiments, but includes all modifications within the scope of equivalents to the configurations described in the claims. [Explanation of symbols]

[0044] 1. Rolling bearings 2. Inner circle 3 outer ring 4 balls 6 Cage 10 First annular part 10a Axial first side 12 Second annular part 12a First axial side 12b Second axial side 14 Cycloids 14a Side 16 pillars 20 Plate-shaped member 20a First side 20b 2nd side 22 Rod-shaped part 26 Main body 26a tip 28 Clamping part 30 External claw 32 Inner Claw 36 End face 36a Flat part 36b First chamfer 36c Second chamfer 40 Page 1 41 First inclined surface 41a Edge 42 Second inclined surface 42a Edge 43 First convex curved surface 43a End 43b Top 46 Third inclined surface 46a Edge 47 Fourth inclined surface 47a Edge 48 Second convex curved surface 48b Top 50 Second surface

Claims

1. A method for manufacturing a rolling bearing including an inner ring, an outer ring, a plurality of rolling elements, and a cage that holds the plurality of rolling elements, comprising: the cage has a first annular component and a second annular component; the first annular component has an annular body having a side surface facing a first axial direction of the first annular component, and a plurality of pillars provided on the side surface and extending in the axial direction, the second annular component includes a plurality of plate-like members arranged at equal intervals in a circumferential direction, and a plurality of rod-like portions connecting the plurality of plate-like members in an annular shape, the plurality of pillars each having a plurality of main body portions extending from the side surface and a plurality of clamping portions provided at tips of the plurality of main body portions, Each of the plurality of clamping portions has a radially outer outer claw protruding from a tip of the main body portion, and a radially inner inner claw protruding from the tip of the main body portion and configured to clamp the rod-shaped portion between the outer claw and the clamping portion, each of the plurality of rod-shaped portions is connected to a pair of end surfaces of a pair of adjacent plate-shaped members among the plurality of plate-shaped members; Each of the pair of end surfaces is a flat portion facing the other end surface; a first chamfered portion connecting a first side surface of the plate-like member facing a first axial direction side of the second annular component and the flat portion, the rod-shaped portion has a first surface facing a first axial side of the second annular component between the pair of end surfaces, The first surface is a first inclined surface that inclines from a first axial side to a second axial side of the second annular component as it extends radially outward from a center of a width of the first surface in the radial direction; a second inclined surface inclined from a first axial side to a second axial side of the second annular component as it extends radially inward from a center of a width of the first surface in the radial direction; a first convex curved surface portion connecting an edge portion of the first inclined surface and an edge portion of the second inclined surface at a center of a width in a radial direction of the first surface, a circumferential end of the first convex curved surface portion is connected to the first chamfered portion, a central axis of the first annular component is aligned with a central axis of the second annular component, a first axial side of the first annular component is opposed to a first axial side of the second annular component, and then the outer claws and the inner claws of each of the plurality of clamping portions are butted against the rod-shaped portions; The first annular component and the second annular component are pressed against each other in the axial direction, and the rod-shaped components are clamped by the clamping portions. Manufacturing method for rolling bearings.

2. The first side surface and the top of the first convex curved surface portion are aligned in the axial direction. A method for manufacturing a rolling bearing according to claim 1.

3. Each of the pair of end surfaces is a second chamfered portion connecting a second side surface of the plate-like member facing a second axial direction side of the second annular component to the flat portion, the rod-shaped portion has a second surface facing a second axial side of the second annular component between the pair of end surfaces, The second surface is a third inclined surface inclined from a second axial side to a first axial side of the second annular component as it extends radially outward from a center of a width of the second surface in the radial direction; a fourth inclined surface inclined from the second axial side to the first axial side of the second annular component as it extends radially inward from the width center; a second convex curved surface portion connecting an edge portion of the third inclined surface and an edge portion of the fourth inclined surface at a center of a width of the second surface in a radial direction, A circumferential end of the second convex curved surface portion is connected to the second chamfered portion. A method for manufacturing a rolling bearing according to claim 1 or 2.

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