Retainer, rolling bearing, and method for assembling rolling bearing

Abstract

The cage (14) has: a first wall facing a first end surface (26) of a roller (13) of the rolling bearing (10); a second wall facing a second end face (27) of the roller (13); and a plurality of columns connecting the first wall and the second wall. A space located between the first wall and the second wall and between the pair of columns serves as a pocket (29) for accommodating a roller (13). The column is provided with a falling-off prevention part on at least one of the first side and the second side in the radial direction, wherein the falling-off prevention part is used for preventing the rollers (13) accommodated in the pockets (29) from falling off. A connection portion between the first wall and the column has a first concave surface (44) located on a first side in the radial direction and a second concave surface (43) located on a second side in the radial direction, and the first concave surface (44) is recessed larger than the second concave surface (43).

Description

Technical Field

[0001] The invention relates to a retaining frame, a rolling bearing and an assembling method of the rolling bearing. Background Art

[0002] A rolling bearing comprises an inner ring, an outer ring, multiple rolling elements, and a cage that holds the rolling elements. The cage has multiple pockets for accommodating the rolling elements. The cage disclosed in Patent Document 1 comprises a first annular body that faces the first end face of the rollers (rolling elements), a second annular body that faces the second end face of the rollers, and multiple posts connecting the first and second annular bodies. The space between the first and second annular bodies and between the pair of posts serves as the pockets for accommodating the rollers.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2021-143765 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] Figure 21 This is a perspective view showing a portion of a conventional retainer. Figure 22 This figure shows the pockets of a conventional retainer, viewed along the roller axis. Retainer 90 has protrusions 92 that act as fall-out prevention features to prevent rollers 99 housed in pockets 91 from falling out. Two protrusions 92 are located in each pocket 91. The dimension B between the two protrusions 92 is smaller than the diameter D of roller 99. Therefore, when roller 99 is installed in pocket 91, it presses against protrusions 92, elastically deforming posts 93 of retainer 90. This results in stress concentration at the connection 95 between post 93 and annular body 94.

[0008] To alleviate this stress concentration, a recessed surface 96 is provided in the connection portion 95 between the column 93 and the annular body 94. Recessed surface 96 is formed over the entire area from the outer peripheral surface 97 to the inner peripheral surface 98 of the retainer 90. Since recessed surface 96 is formed over a wide area, the wall thickness of the connection portion 95 becomes smaller, which may result in insufficient strength of the retainer 90.

[0009] Furthermore, the contact area between roller 99 and annular body 94 is narrowed by recessed surface 96. For manufacturing purposes, roller 99 has a recessed portion 100 radially inwardly of end surface 99a. End surface 99a of roller 99 contacts annular body 94, but if recessed portion 100 is large and recessed surface 96 is radially wide, the contact area between roller 99 and annular body 94 becomes narrower. Therefore, particularly when retainer 90 is made of resin, a portion of annular body 94 is easily worn by contact with end surface 99a of roller 99.

[0010] Therefore, the present disclosure can alleviate stress concentration generated when rollers are installed in pockets in a cage of a rolling bearing, thereby suppressing wear caused by contact with the rollers.

[0011] Means for solving problems

[0012] The retainer of an embodiment of the present invention comprises: a first wall, opposite to the first end face of the roller of the rolling bearing; a second wall, opposite to the second end face of the roller; and a plurality of columns, connecting the first wall and the second wall, wherein the space between the first wall and the second wall and between a pair of the columns becomes a pocket for accommodating the roller, wherein the column has a fall-off prevention portion on at least one of the first side and the second side in the radial direction for preventing the roller accommodated in the pocket from falling off, and the connection portion between the first wall and the column has a first concave surface located on the first side in the radial direction and a second concave surface located on the second side in the radial direction, and the first concave surface is more recessed than the second concave surface.

[0013] Effects of the Invention

[0014] The cage of the present invention can alleviate stress concentration generated when rollers are installed in the cage pockets, and can suppress wear of the cage caused by contact with the rollers. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a cross-sectional view showing one embodiment of the rolling bearing of the present invention.

[0016] Figure 2 It is a three-dimensional diagram of the retainer.

[0017] Figure 3 This is an explanatory diagram when viewing the roller housed in the pocket along the center axis of the roller.

[0018] Figure 4 It is from Figure 3 The illustrations shown are diagrams in which the rollers are removed.

[0019] Figure 5 This is a partial enlarged view of the cage.

[0020] Figure 6 This is a cross-sectional view of a region where the concave arc surface is formed in the first connection portion as viewed along the radial direction of the retainer.

[0021] Figure 7 This is a cross-sectional view of a region where the recessed surface is formed in the first connection portion as viewed in the radial direction of the retainer.

[0022] Figure 8 Yes Figure 5 A perspective view of a modified example of the retainer shown.

[0023] Figure 9 Is used to illustrate Figure 8 The drawings of the cage shown are drawings when the pockets are viewed along the center axis of the rollers.

[0024] Figure 10 It is a cross-sectional view showing another embodiment of a rolling bearing.

[0025] Figure 11 yes Figure 10 A perspective view of a cage included in the rolling bearing shown.

[0026] Figure 12 Yes Figure 11 A perspective view of a modified example of the retainer shown.

[0027] Figure 13 It is a cross-sectional view showing another embodiment of a rolling bearing.

[0028] Figure 14 Yes Figure 13 A front view of a portion of a rolling bearing is shown.

[0029] Figure 15 It is a three-dimensional diagram of the retainer segment.

[0030] Figure 16 Yes Figure 8 FIG. 1 is a diagram showing a modified example of the retainer.

[0031] Figure 17 Yes Figure 9 FIG. 1 is a diagram showing a modified example of the retainer.

[0032] Figure 18 This is an enlarged cross-sectional view showing a portion of the rolling bearing.

[0033] Figure 19 This is a diagram showing still another modified example of the retainer.

[0034] Figure 20 Yes Figure 11 and Figure 12 FIG. 2 is a diagram showing yet another modified example of the retainer.

[0035] Figure 21 This is a perspective view showing a portion of a conventional retainer.

[0036] Figure 22 This is a diagram showing pockets of a conventional cage as viewed along the roller axis. DETAILED DESCRIPTION

[0037] <Overview of Embodiments of the Invention>

[0038] Hereinafter, embodiments of the present invention will be briefly described.

[0039] (1) A retainer according to an embodiment of the present invention comprises: a first wall opposite to a first end face of a roller of a rolling bearing; a second wall opposite to a second end face of the roller; and a plurality of columns connecting the first wall and the second wall, wherein a space between the first wall and the second wall and between a pair of the columns becomes a pocket for accommodating the roller, wherein the column has a fall-off prevention portion on at least one of the first side and the second side in the radial direction for preventing the roller accommodated in the pocket from falling off, and a connection portion between the first wall and the column has a first concave surface located on the first side in the radial direction and a second concave surface located on the second side in the radial direction, wherein the first concave surface is more recessed than the second concave surface.

[0040] In this retainer, to fit the roller into the pocket, the roller presses against the fall-out prevention portion, elastically deforming the post. In this case, the first concave surface mitigates stress concentration generated at the connection portion. The first concave surface exists on the first radial side and not on the second radial side. Therefore, compared to a case where the first concave surface extends from the first radial side to the second radial side, the contact area between the roller's first end face and the first wall is wider. This reduces wear on the retainer caused by this reduced contact area.

[0041] (2) Preferably, the first concave surface has an inclined surface, and a gap formed between the inclined surface and the roller becomes larger as the gap becomes farther away from the second concave surface in the radial direction.

[0042] The retainer in this case can enhance the function of ensuring a large contact area without impairing the function of alleviating the stress concentration.

[0043] (3) Preferably, the retainer is a retainer made of resin, the first wall has a connecting surface that connects the first concave surface on the column side of one of a pair of adjacent columns to the first concave surface on the column side of the other column, and the connecting surface is a surface in which the gap formed between the connecting surface and the roller gradually increases as it moves toward the first side in the radial direction.

[0044] In this case, when the retainer is formed using a die, the die can be easily pulled out toward the first side in the radial direction.

[0045] (4) Preferably, the first wall is a first annular body in the shape of a circular ring, and the second wall is a second annular body in the shape of a circular ring.

[0046] In this case, the retainer is annular and has a plurality of pockets, and rollers are housed in each pocket.

[0047] (5) Preferably, the retainer is composed of a plurality of retainer segments located in an annular space between an inner ring and an outer ring of the rolling bearing, wherein each retainer segment has the first wall, the second wall, and the two columns.

[0048] The retainer in this case is composed of a plurality of retainer segments.

[0049] (6) Preferably, the second radial side edge of the connecting surface is located closer to the first radial side than the second radial side end of each of the first concave surface on the one pillar side and the first concave surface on the other pillar side.

[0050] According to this structure, the surface of the first wall that can contact the roller is widened, and wear of this surface caused by sliding contact with the roller can be prevented.

[0051] (7) A rolling bearing according to an embodiment of the present invention includes: an inner ring; an outer ring; a plurality of rollers located between the inner ring and the outer ring; and the retainer that retains the rollers.

[0052] The cage included in the rolling bearing can alleviate stress concentration generated when the rollers are fitted into the pockets, thereby suppressing wear caused by contact with the rollers.

[0053] (8) The assembly method of the rolling bearing in the embodiment of the present invention has an integration step, in which the roller is installed relative to the pocket from at least one of the first side and the second side in the radial direction to obtain a unit of the retaining frame and the roller. In the integration step, the roller is installed in the pocket while the roller presses the anti-falling portion to elastically deform the column.

[0054] According to the above-described assembly method, stress concentration generated when the rollers are installed in the pockets can be alleviated, and wear caused by contact with the rollers in the cage of the assembled rolling bearing can be suppressed.

[0055] <Details of Embodiments of the Invention>

[0056] Hereinafter, embodiments of the present invention will be described.

[0057] [First method of rolling bearings]

[0058] Figure 1 This is a cross-sectional view showing one embodiment of the rolling bearing of the present invention. Figure 1 The rolling bearing 10 shown is a cylindrical roller bearing comprising an inner ring 11, an outer ring 12, multiple rollers (cylindrical rollers) 13, and a cage 14 that holds the rollers 13. The inner ring 11 and outer ring 12 have an annular shape. The rollers 13 are located between the inner ring 11 and the outer ring 12. The central axis of the inner ring 11 coincides with the central axis of the outer ring; these central axes form the central axis C of the rolling bearing 10.

[0059] Figure 1 The illustrated retainer 14 is annular. The various embodiments of the present invention describe a state in which the center axis of retainer 14 coincides with the center axis C of rolling bearing 10. With respect to inner ring 11, outer ring 12, and retainer 14, directions parallel to center axis C are defined as "axial directions." Directions perpendicular to center axis C are defined as "radial directions." Directions along a circle centered on center axis C are defined as "circumferential directions."

[0060] The inner ring 11 has an inner ring raceway 21 on its outer circumference. The outer ring 12 has an outer ring raceway 22 on its inner circumference. The outer ring 12 has flanges 23 on both axial sides of the outer ring raceway 22. The roller 13 is cylindrical and has a first end face 26, a second end face 27, and an outer circumferential surface 28. The roller 13 is in rolling contact with the inner ring raceway 21 and the outer ring raceway 22. The inner ring 11, outer ring 12, and roller 13 are made of steel. The retainer 14 is made of resin.

[0061] Figure 2 This is a perspective view of the retainer 14. The retainer 14 includes a first annular body 31, a second annular body 32, and a plurality of columns 33. The first annular body 31 is annular and forms a first wall facing the first end face 26 of the roller 13. The second annular body 32 is annular and forms a second wall facing the second end face 27 of the roller 13. The columns 33 connect the first annular body 31 and the second annular body 32. The columns 33 face the outer circumferential surface 28 of the roller 13. The space between a pair of circumferentially adjacent columns 33 located between the first annular body 31 and the second annular body 32 forms a pocket 29 for accommodating the roller 13.

[0062] The column 33 has an inner fall-out prevention portion 34 on the inner circumference of the retainer 14. The fall-out prevention portion 34 prevents the roller 13 accommodated in the pocket 29 from falling out. The fall-out prevention portion 34 is provided locally on the column 33 in the axial direction and is constituted by a protrusion protruding from the column 33. Figure 3This is an explanatory diagram of the roller 13 housed in the pocket 29 as viewed along the center axis P of the roller 13. When the roller 13 housed in the pocket 29 displaces radially inward of the retainer 14, it contacts the fall-off preventing portion 34, preventing the roller 13 from falling out.

[0063] The column 33 has an outer fall-off prevention portion 35 on the outer peripheral side of the retainer 14. The fall-off prevention portion 35 prevents the roller 13 accommodated in the pocket 29 from falling off. The fall-off prevention portion 35 is provided locally on the column 33 in the axial direction (see Figure 2 ), which is composed of a protrusion protruding from the column 33. In addition, the outer fall-off prevention portion 35 can also be omitted.

[0064] Figure 1 The method of assembling the rolling bearing 10 shown is as follows. With the cage 14 positioned on the inner circumference of the outer ring 12, the rollers 13 are installed in the pockets 29 of the cage 14. The rollers 13 are installed in the pockets 29 from the inner circumference of the cage 14. Figure 3 As shown, focusing on one pocket 29, the dimension B between the two fall-out prevention portions 34 is smaller than the diameter D of the roller 13. Therefore, when the roller 13 is installed in the pocket 29, the roller 13 presses against the fall-out prevention portion 34, elastically deforming the post 33. The structure in which all rollers 13 are installed in the pockets 29 of the retainer 14 located in the outer ring 12 is the outer ring assembly. The assembly comprising the inner ring 11 and the outer ring assembly is the rolling bearing 10.

[0065] exist Figure 2 In the example, the portion where the first annular body 31 connects to a single post 33 is the first connecting portion 41. The portion where the second annular body 32 connects to a single post 33 is the second connecting portion 42. Focusing on a unit pocket 15 that forms a single pocket 29, two posts 33 sandwich a single roller 13 housed in that pocket 29 in the circumferential direction of the retainer 14. Therefore, two first connecting portions 41 and two second connecting portions 42 exist in a single pocket 15.

[0066] Figure 4 It is from Figure 3 The roller 13 is removed from the illustrated illustration. Figure 5 It is a partial enlarged view of the retainer 14.

[0067] The first connection portion 41 has a concave arc surface (second concave surface) 43 located on the outer circumference and a recessed surface (first concave surface) 44 located on the inner circumference. The concave arc surface 43 is a surface having a cylindrical shape along a small radius. The recessed surface 44 is a surface that is more recessed than the concave arc surface 43. The concave arc surface 43 and the recessed surface 44 are also provided on the second connection portion 42. That is, the second connection portion 42 has a concave arc surface 43 located on the outer circumference and a recessed surface 44 located on the inner circumference. In this embodiment, the concave arc surface 43 of the first connection portion 41 and the concave arc surface 43 of the second connection portion 42 have the same shape, and the recessed surface 44 of the first connection portion 41 and the recessed surface 44 of the second connection portion 42 have the same shape.

[0068] The concave surface 44 is a surface having a shape along a cone. The concave surface 44 has an inclined surface 45 that becomes larger as it moves away from the concave arc surface 43 in the radial direction, that is, as it moves closer to the inner circumference. Figure 1 ) The gap e1 formed between the end faces 26 (27) of the first and second components 11 and 11 becomes larger as it approaches the inner peripheral side due to the inclined surface 45.

[0069] Figure 6 14 is a cross-sectional view of the region where the concave arc surface 43 is formed in the first connecting portion 41 as viewed in the radial direction of the retainer 14. Figure 4 as well as Figure 6 As shown, the column 33 has a side surface 33a opposite to the outer peripheral surface 28 of the roller 13. The first annular body 31 has a side surface 31a opposite to the first end surface 26 of the roller 13. The concave arc surface 43 is the surface of the intersection of the first annular body 31 and the column 33, when viewed in the radial direction (refer to Figure 6 ) The cross section becomes a concave arc shape. Figure 6 In the cross section shown, the side surface 33a of the column 33 is along the tangent line at the first end 43a of the concave arc surface 43. The side surface 31a of the first annular body 31 is along the tangent line at the second end 43b of the concave arc surface 43.

[0070] Figure 7 1 is a cross-sectional view of the region where the recessed surface 44 is formed in the first connection portion 41 as viewed along the radial direction of the retainer 14. Figure 4 and Figure 7 As shown, the concave surface 44 is the surface of the portion where the first annular body 31 and the column 33 intersect, and is viewed in the radial direction (refer to Figure 7 ) The cross section is a concave arc shape. Figure 7 In the cross section shown, the side surface 33a of the post 33 is along a tangent line at the first end 44a of the recessed surface 44. The side surface 31a of the first annular body 31 intersects a tangent line K at the second end 44b of the recessed surface 44. The recessed surface 44 is recessed from the side surface 31a of the first annular body 31 so as to be away from the end surface 26 of the roller 13.

[0071] Figure 8 Yes Figure 5 1 is a perspective view of a modified example of the retainer 14 shown. Figure 9 Is used to illustrate Figure 8 The drawings of the cage 14 shown are drawings when the pockets 29 are viewed along the center axis P of the roller 13. Figure 8 and Figure 9 The cage 14 shown and Figures 2 to 5 In the retainer 14 shown, the same structures are marked with the same reference numerals. Figure 8 and Figure 9 The retainer 14 shown is also Figures 2 to 5 The retainer 14 shown in the figure also has a first connection portion 41 having a concave arc surface 43 on the outer circumference and a recessed surface 44 on the inner circumference. The recessed surface 44 is a surface that is more recessed than the concave arc surface 43. The concave arc surface 43 and the recessed surface 44 are also provided on the second connection portion 42.

[0072] Figure 8 and Figure 9 The retainer 14 shown is similar to the first annular body 31 in that it has a connecting surface 46. Figures 2 to 5 The cage 14 shown is different. Figure 8 and Figure 9 In the case of the retainer 14 shown, the first annular body 31 has a connecting surface 46 that connects the recessed surface 44 on one side of a pair of circumferentially adjacent columns 33 to the recessed surface 44 on the other side of the column 33. The connecting surface 46 is a surface where the gap e2 formed between the connecting surface 46 and the roller 13 (first end face 26) gradually increases toward the inner circumference. The connecting surface 46 is a surface that is inclined from the side surface 31a of the first annular body 31. Similarly to the first annular body 31, the second annular body 32 may also have a connecting surface 46. When the retainer 14 is molded using a mold (injection mold), the connecting surface 46 facilitates radial removal of the mold.

[0073] Figure 16 and Figure 17 Yes Figure 8 and Figure 9 FIG. 1 is a diagram showing a modified example of the retainer 14. Figure 16 and Figure 17 The method shown and Figure 8 and Figure 9 In the embodiment shown, the connecting surface 46 is different, but the other structures are the same. The same structures are marked with the same reference numerals, and the description of the same structures is omitted. Figure 16 and Figure 17 In the case of the modified example shown, Figure 8 and Figure 9Compared to the embodiment shown, the radially outer edge 46e of the connecting surface 46 is located closer to the radially inner side. The edge 46e is a portion along the line where the connecting surface 46 intersects the side surface 31a.

[0074] Specifically, the end edge 46e of the connecting surface 46 is located radially inward of the radially outer end 44e of each of the concave surface 44 on the one column 33 side and the concave surface 44 on the other column 33 side. According to this structure, the area of ​​the side surface 31a that can contact the roller 13 in the first annular body 31 is larger than that of the first annular body 31. Figure 8 and Figure 9 As a result, the wear of the side surface 31a can be reduced.

[0075] exist Figure 8 and Figure 9 The method shown, and Figure 16 and Figure 17 In the embodiment shown, when the roller 13 is installed in the pocket 29, the intersection 25 between the end face 26 and the outer peripheral surface 28 of the roller 13 (see Figure 18 ) and the connecting surface 46. Therefore, the roller 13 is easily installed in the pocket 29. The intersection portion 25 is a convex rounded portion.

[0076] Figure 19 1 is a diagram showing another modified example of the retainer 14. Figure 17 In the case of the embodiment shown in FIG. 4 , the edge 46e of the connecting surface 46 has a straight line shape. Figure 19 In the embodiment shown, the end edge 46e of the connecting surface 46 has an arc shape. This arc shape is a circle shape that is concentric with the arc shape of the inner peripheral surface 31b of the first annular body 31. Figure 17 In the case of the embodiment shown, the effect of enlarging the area of ​​the side surface 31a is higher. Figure 19 The embodiment shown has a high effect of facilitating the assembly of the roller 13 into the pocket 29. The arc shape of the edge 46e may not be concentric with the arc shape of the inner peripheral surface 31b of the first annular body 31.

[0077] exist Figure 18 In FIG, the connecting surface 46 intersects the inner peripheral surface 31b of the first annular body 31. The intersection line is the inner edge 46f of the connecting surface 46 in the radial direction. Figure 18 In the embodiment shown, the inner edge 46f of the connecting surface 46 coincides with the radially inner end 44f of the recessed surface 44. However, the present invention is not limited thereto, and the inner edge 46f of the connecting surface 46 may be located axially closer to the roller 13 than the inner end 44f of the recessed surface 44.

[0078] In each of the above-described aspects of the retainer 14 , the second annular body 32 also has the same structure as the connecting surface 46 of the first annular body 31 .

[0079] [Second method of rolling bearings]

[0080] Figure 10 It is a cross-sectional view showing another embodiment of a rolling bearing. Figure 10 The rolling bearing 10 shown is a tapered roller bearing, and the rollers 13 arranged between the inner ring 11 and the outer ring 12 are tapered rollers. Figure 10 The rolling bearing 10 shown is Figure 1 The same components of the rolling bearing 10 are denoted by the same reference numerals, and description of the same components will be omitted.

[0081] Figure 11 yes Figure 10 The figure shows a perspective view of the retainer 14 of the rolling bearing 10. The retainer 14 includes a first annular body 31 with a large diameter, a second annular body 32 with a small diameter, and a plurality of columns 33. The first annular body 31 is annular and forms a first wall opposite the first end face 26 of the roller 13. The second annular body 32 is annular and forms a second wall opposite the second end face 27 of the roller 13. The columns 33 connect the first annular body 31 and the second annular body 32. The columns 33 face the outer peripheral surface 28 of the roller 13. The space between a pair of columns 33 located between the first annular body 31 and the second annular body 32 and adjacent in the circumferential direction forms a pocket 29 for accommodating the roller 13.

[0082] The column 33 has an inner fall-off prevention portion 34 on the inner circumference of the retainer 14. The fall-off prevention portion 34 prevents the roller 13 accommodated in the pocket 29 from falling off. The fall-off prevention portion 34 is locally provided on the column 33 in the axial direction and is composed of a protrusion protruding from the column 33. Figure 11 In the embodiment shown, the fall-off preventing portion 34 is provided closer to the first annular body 31 than the second annular body 32. When the roller 13 accommodated in the pocket 29 is displaced radially inward of the retainer 14, it contacts the fall-off preventing portion 34, preventing the roller 13 from falling out.

[0083] Figure 10 The method of assembling the rolling bearing 10 shown is as follows. With the cage 14 positioned on the inner circumference of the outer ring 12, the rollers 13 are installed in the pockets 29 of the cage 14. The rollers 13 are installed in the pockets 29 from the inner circumference of the cage 14. Figure 3), focusing on a single pocket 29, the dimension between the two fall-out prevention portions 34 is smaller than the diameter of the roller 13 at the location where these fall-out prevention portions 34 are formed. Therefore, when the roller 13 is installed in the pocket 29, the roller 13 presses against the fall-out prevention portion 34, causing the post 33 to elastically deform. The outer ring assembly comprises all rollers 13 installed in the pockets 29 of the retainer 14 located in the outer ring 12. The rolling bearing 10 comprises the inner ring 11 and outer ring assembly. During this installation, the end faces of the rollers 13 are pressed along the first concave surface 44 using an installation jig, allowing the rollers 13 to be smoothly installed in the pockets 29.

[0084] exist Figure 11 In the embodiment, the portion where the first annular body 31 is connected to one column 33 is the first connecting portion 41. The portion where the second annular body 32 is connected to one column 33 is the second connecting portion 42. In one pocket portion 15 constituting one pocket 29, there are two first connecting portions 41 and two second connecting portions 42. This is also similar to the first embodiment (see Figure 2 )same.

[0085] The first connection portion 41 has a concave arc surface 43 located on the outer circumference and a recessed surface 44 located on the inner circumference. The concave arc surface 43 is a surface having a cylindrical shape along a small radius. The recessed surface 44 is a surface that is more recessed than the concave arc surface 43. Figure 11 In the illustrated embodiment, the concave arc surface 43 and the recessed surface 44 are not provided on the second connection portion 42 , but may be provided on the second connection portion 42 .

[0086] The concave surface 44 is a surface having a shape along a cone. The concave surface 44 has an inclined surface 45 that becomes larger as it moves away from the concave arc surface 43 in the radial direction, that is, as it moves closer to the inner circumference. Figure 10 The gap e1 formed between the end faces 26 of the first embodiment ( Figure 6 and Figure 7 )same.

[0087] Figure 12 Yes Figure 11 1 is a perspective view of a modified example of the retainer 14 shown. Figure 12 The retainer 14 shown is similar to the first annular body 31 in that it has a connecting surface 46. Figure 11 The cage 14 shown is different. Figure 12In the case of the retainer 14 shown, the first annular body 31 has a connecting surface 46 that connects the concave surface 44 on the side of one of a pair of circumferentially adjacent columns 33 to the concave surface 44 on the side of the other column 33. The connecting surface 46 is a surface where the gap formed between the connecting surface 46 and the roller 13 (first end surface 26) gradually increases toward the inner circumference. The connecting surface 46 is a surface inclined from the side surface 31a of the first annular body 31. The connecting surface 46 is connected to the roller 13 (first end surface 26). Figure 8 The connecting surface 46 of the illustrated retainer 14 is similarly constructed.

[0088] Figure 20 Yes Figure 11 and Figure 12 FIG. 1 is a diagram showing another modified example of the retainer 14. Figure 20 The method shown and Figure 11 and Figure 12 In the embodiment shown, the connecting surface 46 is different, but the other structures are the same. The same structures are marked with the same reference numerals, and the description of the same structures is omitted. Figure 20 In the case of the modified example shown, Figure 12 Compared to the embodiment shown, the radially outer edge 46e of the connecting surface 46 is located closer to the radially inner side. The edge 46e is a portion along a line intersecting the connecting surface 46 and the side surface 31a.

[0089] Specifically, the end edge 46e of the connecting surface 46 is located radially inward of the radially outer end 44e of each of the concave surface 44 on the one column 33 side and the concave surface 44 on the other column 33 side. According to this structure, the area of ​​the side surface 31a that can contact the roller 13 in the first annular body 31 is larger than that of the first annular body 31. Figure 12 As a result, the wear of the side surface 31a can be reduced. The end edge 46e of the connecting surface 46 can be a straight line or a straight line. Figure 19 As described in the embodiment shown, it is in an arc shape.

[0090] In each of the above-described aspects of the retainer 14 , the second annular body 32 also has the same structure as the connecting surface 46 of the first annular body 31 .

[0091] [Third method of rolling bearings]

[0092] Figure 13 It is a cross-sectional view showing another embodiment of a rolling bearing. Figure 13 The rolling bearing 10 shown is a tapered roller bearing, and the rollers 13 arranged between the inner ring 11 and the outer ring 12 are tapered rollers. Figure 13 The rolling bearing 10 shown is Figure 1The same structures of the rolling bearing 10 shown are marked with the same reference numerals, and the description of the same structures is omitted. Figure 14 As shown, the third embodiment of the rolling bearing 10 includes a cage 14 composed of a plurality of cage segments 17. The plurality of cage segments 17 are located in the annular space S between the inner ring 11 and the outer ring 12. One cage segment 17 holds one roller 13.

[0093] Figure 15 This is a perspective view of the retainer segment 17. The retainer segment 17 has a first wall 51, a second wall 52, and two columns 53. The first wall 51 and the roller 13 (see Figure 13 ) faces first end face 26 of roller 13. Second wall 52 faces second end face 27 of roller 13. Post 53 connects first wall 51 and second wall 52. Post 53 faces outer circumferential surface 28 of roller 13. The space between first wall 51 and second wall 52 and between the pair of posts 53 forms pocket 29 for accommodating roller 13.

[0094] The column 53 has an outer fall-out prevention portion 35 on the outer circumference of the retainer segment 17. This fall-out prevention portion 35 prevents the roller 13 housed in the pocket 29 from falling out. The fall-out prevention portion 35 is formed by a protrusion protruding from the column 53. If the roller 13 housed in the pocket 29 moves radially outward from the retainer 14, it contacts the fall-out prevention portion 35, preventing the roller 13 from falling out.

[0095] The column 53 has an inner fall-out prevention portion 34 on the inner circumference of the retainer segment 17. This fall-out prevention portion 34 prevents the roller 13 housed in the pocket 29 from falling out. The fall-out prevention portion 34 is formed by a protrusion protruding from the column 53. When the roller 13 housed in the pocket 29 moves radially inward of the retainer 14, it contacts the fall-out prevention portion 34, preventing the roller 13 from falling out.

[0096] Figure 13 The method of assembling the rolling bearing 10 shown is as follows. The rollers 13 are installed in the pockets 29 of the retainer segments 17. The rollers 13 are installed in the pockets 29 from the outer circumference of the retainer segments 17. Figure 15 ), the distance between the two outer fall-out prevention portions 35 is smaller than the diameter of the roller 13 at the locations where these fall-out prevention portions 35 are formed. Therefore, when the roller 13 is installed in the pocket 29, the roller 13 presses against the outer fall-out prevention portions 35, elastically deforming the column 53. A structure in which all rollers 13 are assembled into the retainer segment 17 is a roller with a retainer. A roller with a retainer combined with the inner ring 11 and further combined with the outer ring 12 is a rolling bearing 10.

[0097] exist Figure 15In FIG. 4 , the portion connecting the first wall 51 and the one column 53 is the first connection portion 41. The portion connecting the second wall 52 and the one column 53 is the second connection portion 42. Two first connection portions 41 are present in one retainer segment 17, and two second connection portions 42 are present in one retainer segment 17.

[0098] The first connection portion 41 has a concave arc surface 43 located on the inner circumference and a recessed surface 44 located on the outer circumference. The concave arc surface 43 is a surface having a cylindrical shape along a small radius. The recessed surface 44 is a surface that is more recessed than the concave arc surface 43. The concave arc surface 43 and the recessed surface 44 are also provided on the second connection portion 42. That is, the second connection portion 42 has a concave arc surface 43 located on the inner circumference and a recessed surface 44 located on the outer circumference. The concave arc surface 43 of the first connection portion 41 and the concave arc surface 43 of the second connection portion 42 have the same shape, and the recessed surface 44 of the first connection portion 41 and the recessed surface 44 of the second connection portion 42 have the same shape.

[0099] The concave surface 44 is a surface having a shape along a cone. The concave surface 44 has an inclined surface 45 that becomes larger as it moves away from the concave arc surface 43 in the radial direction, that is, as it moves closer to the outer circumference. Figure 13 The gap formed between the end faces 26 (27) of the first embodiment ( Figure 6 and Figure 7 )same.

[0100] [Regarding each type of rolling bearing 10 and cage 14]

[0101] As described above, the retainer 14 of the rolling bearing 10 in each of the above-described embodiments includes a first annular body 31 (first wall 51) that faces the first end face 26 of the roller 13, a second annular body 32 (second wall 52) that faces the second end face 27 of the roller 13, and a plurality of columns 33 (columns 53) connecting the first annular body 31 (first wall 51) and the second annular body 32 (second wall 52). The space between the first annular body 31 (first wall 51) and the second annular body 32 (second wall 52) and between the pair of columns 33 (columns 53) serves as the pocket 29 that accommodates the roller 13.

[0102] The column 33 (column 53 ) has a fall-off prevention portion on a first side in the radial direction for preventing the roller 13 accommodated in the pocket 29 from falling out.

[0103] In the case of the retainer 14 of the first embodiment (see Figure 3 as well as Figure 4 ), and in the case of the retainer 14 of the second embodiment (see Figure 11), the first side in the radial direction is the inner peripheral side of the retainer 14, and the second side in the radial direction is the outer peripheral side of the retainer 14.

[0104] In the case of the retainer 14 (retainer segment 17) of the third embodiment (see Figure 15 ), the first side in the radial direction is the outer peripheral side of the retainer 14 (retainer segment 17 ), and the second side in the radial direction is the inner peripheral side of the retainer 14 (retainer segment 17 ).

[0105] In the retainer 14 of each of the above-described embodiments, the first connection portion 41 between the first annular body 31 (first wall 51) and the column 33 (column 53) includes a concave arcuate surface 43 located on the second radial side and a recessed surface 44 located on the first radial side. The recessed surface 44 is more recessed than the concave arcuate surface.

[0106] The assembly method for a rolling bearing 10 having a retainer 14 in each of the above-described embodiments includes an integration step in which the rollers 13 are installed into the pockets 29 from the first radial side, thereby forming a unit consisting of the retainer 14 and the rollers 13. During this integration step, the rollers 13 press against the fall-out prevention portion, elastically deforming the posts 33 (posts 53), thereby fitting the rollers 13 into the pockets 29.

[0107] The columns 33 (columns 53 ) elastically deform to fit the rollers 13 into the pockets 29 . Even in this case, the retainer 14 can alleviate the stress concentration generated in the first connection portion 41 through the recessed surface 44 .

[0108] The recessed surface 44 exists on the first radial side but not on the second radial side. This ensures a larger contact area between the first end surface 26 of the roller 13 and the first annular body 31 (first wall 51) than before. This reduces wear on the retainer 14 caused by this reduced contact area.

[0109] The recessed surface 44 exists on the first side in the radial direction, but does not exist on the second side in the radial direction. Therefore, a decrease in the strength of the retainer 14 is suppressed.

[0110] In the retainer 14 of each embodiment described above, the length of the elastically deformable portion of the column 33 (column 53 ) is increased by the recessed surface 44 , thereby facilitating the insertion of the roller 13 into the pocket 29 .

[0111] In the first and third embodiments, the second connection portion 42 between the second annular body 32 (second wall 52) and the column 33 (column 53) has, similar to the first connection portion 41, a concave arcuate surface 43 located on the second radial side and a recessed surface 44 located on the first radial side. The recessed surface 44 is more recessed than the concave arcuate surface 43. This ensures a larger contact area between the second end face 27 of the roller 13 and the second annular body 32 (second wall 52) than conventional methods.

[0112] In each of the above embodiments, the recessed surface 44 includes an inclined surface 45, and the gap formed between the inclined surface 45 and the roller 13 increases as the distance in the radial direction from the concave arc surface 43 increases. The inclined surface 45 ensures a large contact area between the first end surface 26 of the roller 13 and the first annular body 31 (first wall 51) without compromising the stress concentration mitigation function.

[0113] 〔About Other〕

[0114] In the above embodiments, the recessed surface (first concave surface) 44 connected to the concave arc surface (second concave surface) 43 has a shape that conforms to a cone. However, the recessed surface 44 may be a surface other than this. Although not shown, it may also conform to a cylindrical shape that is larger than the concave arc surface 43. For example, the recessed surface 44 may be composed of a surface that conforms to a cylindrical shape that is larger than the concave arc surface 43 and a surface that conforms to a cone.

[0115] In each of the above embodiments, the boundary between the concave arcuate surface 43 and the recessed surface 44 is located midway in the radial direction of the first connecting portion 41 (second connecting portion 42). The concave arcuate surface 43 can be formed to extend radially longer than the recessed surface 44, or the recessed surface 44 can be formed to extend radially longer than the concave arcuate surface 43. When the concave arcuate surface 43 is formed over a longer range, the contact area described above is further increased. When the recessed surface 44 is formed over a longer range, the stress concentration mitigation function is enhanced.

[0116] As described in relation to the above-mentioned embodiments, the shape of the cage may vary depending on the form of the rolling bearing, that is, depending on the rolling elements included in the rolling bearing.

[0117] The above-described embodiments are illustrative in all respects and are not restrictive. The scope of the present invention is indicated by the claims rather than the above-described embodiments, and includes all modifications within the scope of equivalence to the structures described in the claims.

[0118] Description of labels

[0119] 10 Rolling bearings

[0120] 11 Inner Circle

[0121] 12 outer ring

[0122] 13 Rollers

[0123] 14 Cage

[0124] 17 Cage section

[0125] 26 First end face

[0126] 27 Second end face

[0127] 29 pockets

[0128] 31 First annular body (first wall)

[0129] 32 Second annular body (second wall)

[0130] 33 columns

[0131] 34 Fall-off prevention part

[0132] 35 Fall-off prevention unit

[0133] 41 First connection part (connection part)

[0134] 42 Second connection

[0135] 43 concave arc surface (second concave surface)

[0136] 44 concave surface (first concave surface)

[0137] 44e end

[0138] 45 Inclined surface

[0139] 46 connecting surface

[0140] 46e edge

[0141] 51 First Wall

[0142] 52 Second Wall

[0143] 53 columns

Claims

1. A retainer, comprising: a first wall, which is opposite to a first end face of a roller of a rolling bearing; a second wall, which is opposite to a second end face of the roller; and a plurality of columns, which connect the first wall and the second wall, wherein a space between the first wall and the second wall and between a pair of the columns becomes a pocket for accommodating the roller, wherein: The column has a fall-off prevention portion on at least one of the first side and the second side in the radial direction for preventing the roller accommodated in the pocket from falling off. The connection portion between the first wall and the column has a first concave surface located on a first side in a radial direction and a second concave surface located on a second side in the radial direction, and the first concave surface is more concave than the second concave surface.

2. The retainer according to claim 1, wherein: The first concave surface has an inclined surface, and a gap formed between the inclined surface and the roller becomes larger as the gap becomes farther away from the second concave surface in the radial direction.

3. The retainer according to claim 2, wherein: The retainer is a resin retainer. The first wall has a connecting surface that connects the first concave surface on the column side of one of a pair of adjacent columns to the first concave surface on the column side of the other column. The connecting surface is a surface in which a gap formed between the connecting surface and the roller gradually increases toward a first side in a radial direction.

4. The cage according to any one of claims 1 to 3, wherein: The first wall is a first annular body in an annular shape. The second wall is a second annular body in an annular shape.

5. The cage according to any one of claims 1 to 3, wherein: The cage is composed of a plurality of cage segments, and the cage segments are located in the annular space between the inner ring and the outer ring of the rolling bearing. The retainer segments each have the first wall, the second wall, and two columns.

6. The retainer according to claim 3, wherein: The second radial side edge of the connecting surface is located closer to the first radial side than the second radial side ends of each of the first concave surface on the one column side and the first concave surface on the other column side.

7. A rolling bearing, wherein: The rolling bearing comprises: an inner ring; an outer ring; a plurality of rollers located between the inner ring and the outer ring; and a cage for holding the rollers. The cage is the cage according to any one of claims 1 to 6.

8. A method for assembling a rolling bearing, which is the method for assembling a rolling bearing according to claim 7, wherein: The rolling bearing assembly method includes an integration step, wherein the roller is installed relative to the pocket from at least one of a first side and a second side in a radial direction to obtain a unit of the cage and the roller. In the integration step, the roller is fitted into the pocket while the roller presses the fall-off prevention portion to elastically deform the column.

Images