JP2024099473A - Rolling bearing, rotating device, and manufacturing method for rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing in which a resin cover for preventing electrolytic corrosion is accurately attached to a race.

SOLUTION: A rolling bearing comprises: an inner ring and an outer ring 20 arranged coaxially with each other; rolling bodies arranged between the inner ring and the outer ring 20; and a resin cover 60 fitted to the outer ring 20. The outer ring 20 has: an outer peripheral surface 25 facing a side opposite to the inner ring; and an end surface 26 facing an axial direction. The resin cover 60 has: a peripheral wall part 61 covering the outer peripheral surface 25; and a flange part 62 connected to the peripheral wall part 61, and covering the end surface 26. The flange part 62 has a constant width in a radial direction, extends over a whole circumference, and has an opening formation region in which an opening 63 for exposing the end surface 26 is formed.

SELECTED DRAWING: Figure 4

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to rolling bearings, rotating equipment, and methods for manufacturing rolling bearings.

A known rolling bearing has an outer ring whose outer periphery is covered with an insulating film made of an electrically insulating resin or the like to prevent electrolytic corrosion that may occur in the environment in which the rolling bearing is used (see, for example, Patent Documents 1 and 2). When the rolling bearing is mounted on a motor or the like, the end face of the outer ring must also be covered with an insulating film to prevent the end face of the outer ring from contacting metal parts.

The insulating film can be formed by embedding the outer ring in resin by insert molding. In this method, the outer ring is positioned radially and axially within a mold, and then resin is poured into the mold. The outer ring is positioned radially by inserting a positioning member such as a core pin inside the outer ring. The outer ring is positioned axially by abutting the ejector sleeve against the end face of the outer ring. Since it is necessary to cover the end face of the outer ring with an insulating film, for example, by configuring the ejector sleeve to contact the inner peripheral portion of the end face of the outer ring, it is possible to cover most of the end face of the outer ring with an insulating film that is integrated with the portion covering the outer peripheral surface of the outer ring.

It is also possible to cover the inner peripheral surface and end face of the inner ring with an insulating film instead of the outer ring. Even in this case, the insulating film can be formed by insert molding, just like in the case of the outer ring.

JP 2019-206980 A JP 2001-99176 A

In small bearings, the radial width of the end face of the outer ring is small, so in order to ensure the area of the portion of the end face of the outer ring that is covered with the insulating film, the outer diameter of the ejector sleeve must be reduced. However, since the outer ring can shift radially due to the gap with the positioning member, if the difference between the outer diameter of the ejector sleeve and the inner diameter of the end face of the outer ring is small, there is a possibility that the ejector sleeve will not contact the outer ring in some circumferential areas when the outer ring shifts radially from the desired position relative to the mold. In this case, the outer ring will not be positioned in the desired orientation within the mold, and there is a risk of the precision of the molded product decreasing.

The present invention provides a rolling bearing in which a plastic cover for preventing electrolytic corrosion is attached with precision to the raceway, a rotating device equipped with such a rolling bearing, and a method for manufacturing a rolling bearing that allows a plastic cover to be attached with precision to the raceway to prevent electrolytic corrosion.

The rolling bearing according to the first aspect of the present invention comprises an inner ring and an outer ring arranged coaxially with each other, rolling elements arranged between the inner ring and the outer ring, and a resin cover attached to one of the raceways of the inner ring and the outer ring, the one raceway having a peripheral surface facing the opposite side of the other raceway of the inner ring and the outer ring, and an end face facing in the axial direction, the resin cover having a peripheral wall portion covering the peripheral surface and a flange portion connected to the peripheral wall portion and covering the end face, the flange portion having a constant width in the radial direction and extending around the entire circumference, and having an opening forming region in which an opening exposing the end face is formed.

According to the first aspect, when the resin cover is insert-molded integrally with the one raceway ring, a part of the mold can be butted against the portion of the end face of the one raceway ring that is exposed by the opening. Therefore, even if a sufficient space for the mold to contact the periphery of the portion of the end face of the one raceway ring that is covered by the flange portion is not secured in order to allow the one raceway ring to be radially displaced from the desired position in the mold, the one raceway ring can be positioned in the desired orientation in the mold by butting a part of the mold against the end face of the one raceway ring. Therefore, the resin cover for preventing electrolytic corrosion can be attached to the one raceway ring with high precision.
In addition, resin is disposed on both circumferential sides of the opening in the opening formation region. Therefore, although the coverage area of the end face of one of the raceways by the flange portion is reduced due to the formation of the opening, the flange portion can cover a wide radial range of the end face of one of the raceways. Therefore, the insulating performance of the flange portion can be ensured.
In addition, since there is no need to secure sufficient space for a mold to contact the periphery of the portion of the end face of one of the races that is covered by the flange portion, it is possible to arrange the flange portion over a wide radial range. Therefore, the flange portion can insulate the one of the races from the other component that faces the end face of the one of the races, and the contact between the flange portion and the other component can be stabilized.

The rolling bearing according to the second aspect of the present invention is the rolling bearing according to the first aspect, wherein the flange portion further has a covering region that is adjacent to the opening forming region in the radial direction, extends around the entire circumference, and entirely covers the end face.

According to the second aspect, the flange portion has portions located on both circumferential sides of the opening that are connected by the covering region of the flange portion. This ensures the strength of the opening forming region of the flange portion. It also ensures the mechanical strength and friction strength against contact between the flange portion and other components.

The rolling bearing according to the third aspect of the present invention is the rolling bearing according to the first or second aspect, wherein the total area of the opening is smaller than half the area of the opening formation region.

According to the third aspect, the strength of the opening formation area of the flange portion can be ensured. In addition, the mechanical strength and the strength against friction against contact between the flange portion and other parts can be ensured.

The rolling bearing according to the fourth aspect of the present invention is a rolling bearing according to any one of the first to third aspects described above, in which the opening may open to the periphery of the flange portion on the opposite side of the peripheral wall portion.

According to the fourth aspect, during injection molding (insert molding), there is no need to pour the resin that flows from the cavity corresponding to the peripheral wall of the mold to the cavity corresponding to the flange portion into the narrow cavity on the opposite side of the peripheral wall from the opening. This makes it easier to mold the resin cover.

The rolling bearing according to the fifth aspect of the present invention is the rolling bearing according to the second aspect, wherein the covering region is adjacent to the opening forming region on the opposite side of the peripheral wall portion in the radial direction.

According to the fifth aspect, the portions of the flange portion located on both sides of the opening in the circumferential direction are connected by both the covering region and the peripheral wall portion. Therefore, the strength of the opening forming region of the flange portion can be further improved.

The rolling bearing according to the sixth aspect of the present invention is a rolling bearing according to any one of the first to fifth aspects described above, in which the flange portion may have a gap around the entire circumference with respect to the periphery on the opposite side of the periphery at the end face when viewed in the axial direction.

According to the sixth aspect, during injection molding (insert molding), it is possible to prevent the resin from flowing from the cavity corresponding to the flange portion across the periphery of the end face of one of the raceways into the opposite side of the cavity corresponding to the peripheral wall portion in the radial direction. This makes it possible to prevent molding defects from occurring in the manufacturing process of the resin cover, and ultimately to reduce the manufacturing costs of the rolling bearing.

The rolling bearing according to the seventh aspect of the present invention is a rolling bearing according to any one of the first to sixth aspects described above, in which the openings may be arranged at equal intervals in the circumferential direction.

According to the seventh aspect, it is possible to prevent the occurrence of deviation in the center of gravity of the rolling bearing due to the provision of an opening in the resin cover.

The rolling bearing according to the eighth aspect of the present invention is a rolling bearing according to any one of the first to seventh aspects described above, in which the flange portion has a first flange portion covering a first end face of the one raceway and a second flange portion covering a second end face of the one raceway, and the first flange portion and the second flange portion may be formed to have the same shape as each other when viewed in the axial direction.

According to the eighth aspect, the appearance of the rolling bearing is roughly symmetrical on the front and back. This eliminates the need to distinguish between the front and back of the rolling bearing and install it in the device.

The rolling bearing according to the ninth aspect of the present invention is a rolling bearing according to any one of the first to eighth aspects described above, in which the one race is attached to a mounting member, and the opening may be fitted to the mounting member so as not to rotate relative to the mounting member.

According to the ninth aspect, it is possible to restrict the rotation of one of the raceways relative to the mounted member. Furthermore, since the fitting structure with the mounted member is provided on the resin cover, the workability of the one of the raceways is improved and the decrease in the roundness of the one of the raceways due to forming it into a complex shape can be suppressed compared to when a fitting structure with the mounted member is provided on a metal raceway. Therefore, it is possible to suppress the occurrence of creep while suppressing the decrease in accuracy of the rolling bearing.

The rotating device according to the tenth aspect of the present invention comprises a rotatably arranged rotating body, a support that rotatably supports the rotating body, and a rolling bearing according to any one of the first to ninth aspects interposed between the rotating body and the support.

According to the tenth aspect, the rolling bearing is provided with a resin cover to prevent electrolytic corrosion, so that the increase in the rotational resistance of the rolling bearing caused by electrolytic corrosion can be suppressed. Therefore, the life of the rotating equipment can be extended.

The manufacturing method of a rolling bearing according to the eleventh aspect of the present invention is a manufacturing method of a rolling bearing in which a resin cover that is attached to a race of the rolling bearing and covers the peripheral surface and end faces of the race is insert-molded integrally with the race, and the race is embedded in the resin cover using a mold having a core that holds the race alone and an ejector sleeve that has multiple pin portions in the circumferential direction that abut against the end faces.

According to the eleventh aspect, the resin cover can be insert molded integrally with the raceway ring while the pin portion is abutted against the raceway ring. Therefore, even if the raceway ring is displaced radially from the desired position in the mold and sufficient space cannot be secured for the ejector sleeve to contact the inner or outer periphery of the end face of the raceway ring, the pin portion can be abutted against the end face of the raceway ring to position the raceway ring in the desired orientation in the mold. Therefore, the resin cover for preventing electrolytic corrosion can be attached to the raceway ring with high precision.
Moreover, because cavities are formed on both circumferential sides of the pin portion of the mold, resin is placed in the resin cover at locations corresponding to the cavities. Therefore, although the area of the end face of the raceway ring covered by the resin cover is reduced by providing the pin portion on the ejector sleeve, the resin cover can cover a wide radial range of the end face of the raceway ring. This ensures the insulating performance of the resin cover.
In addition, since there is no need to secure sufficient space for the ejector sleeve to come into contact with the inner or outer periphery of the end face of the raceway, the portion of the resin cover that covers the end face of the raceway can be disposed over a wide radial range. This allows the raceway to be insulated from other components that face the end face of the raceway by the resin cover, and also allows for stable contact between the resin cover and other components.
Furthermore, because the core holds the raceway alone, unlike when the core holds an assembled rolling bearing, the raceway to which the resin cover is attached can be stabilized within the mold, and the resin cover can be attached to the raceway with high precision.

According to the present invention, a resin cover for preventing electrolytic corrosion can be attached to the raceway with high precision.

1 is a vertical cross-sectional view showing a fan motor according to an embodiment of the present invention; FIG. 2 is a plan view of the rolling bearing of the first embodiment. 1 is a vertical sectional view of a rolling bearing according to a first embodiment. FIG. FIG. 2 is a plan view of the outer ring and the resin cover according to the first embodiment. FIG. 5 is an enlarged view of a portion V in FIG. 4 . FIG. 2 is an enlarged view showing a portion VI in FIG. 3A to 3C are diagrams illustrating a manufacturing method of the rolling bearing according to the first embodiment. FIG. 7 is an enlarged plan view of an outer ring and a resin cover of a first modified example of the first embodiment, corresponding to FIG. 5 . FIG. 7 is an enlarged plan view of an outer ring and a resin cover of a second modified example of the first embodiment, corresponding to FIG. 5 . FIG. 11 is a plan view of the outer ring and the resin cover according to the second embodiment. FIG. 11 is an enlarged view of a portion XI in FIG. FIG. 11 is a vertical sectional view of a rolling bearing according to a third embodiment.

The following describes an embodiment of the present invention with reference to the drawings. In the following description, components having the same or similar functions are given the same reference numerals. Furthermore, duplicate descriptions of those components may be omitted.

FIG. 1 is a vertical cross-sectional view showing a fan motor according to an embodiment.
The fan motor 100 shown in FIG. 1 is an example of a rotating device. The fan motor 100 includes a rotor 110 having a shaft portion 111, a base portion 120 supporting the rotor 110, a drive portion 130 rotating the rotor 110 relative to the base portion 120, and a pair of rolling bearings 1 mounted on the base portion 120 and rotatably supporting the shaft portion 111. In the following description, the rolling bearings 1 may be simply referred to as bearings 1. In addition, in this embodiment, the direction in which the central axis O of the shaft portion 111 of the rotor 110 extends is referred to as the axial direction, the direction extending radially from the central axis O perpendicular to the central axis O is referred to as the first radial direction, and the direction revolving around the central axis O is referred to as the first circumferential direction. In addition, one of the directions parallel to the axial direction and pointing in opposite directions is defined as the upward direction, and the other is defined as the downward direction.

The base portion 120 has a cylindrical portion 121 extending in the axial direction. The shaft portion 111 of the rotor 110 is inserted into the cylindrical portion 121.
The rotating body 110 is disposed above the base 120. The rotating body 110 includes a shaft portion 111 and a fan 112 connected to the shaft portion 111 on the outside of the cylindrical portion 121. The fan 112 is fixed to the upper end of the shaft portion 111. The fan 112 includes a flange 113 that protrudes outward in the first radial direction from the upper end of the shaft portion 111 and extends over the entire first circumferential direction, a peripheral wall 114 that extends downward from the entire outer circumferential edge of the flange 113, and a plurality of blades 115 that are arranged at intervals in the first circumferential direction outside the peripheral wall 114 in the first radial direction. The peripheral wall 114 surrounds the cylindrical portion 121 over the entire circumference while being spaced apart from the cylindrical portion 121 in the first radial direction.

The driving unit 130 is a motor. The driving unit 130 includes a stator 131 having a coil and a rotor 132 having a magnet. The stator 131 is fixed to the base 120 on the outside of the shaft portion 111. The rotor 132 is fixed to the peripheral wall 114 of the fan 112 on the outside of the stator 131 in the first radial direction.

The pair of bearings 1 are each interposed between the inner peripheral surface of the cylindrical portion 121 and the outer peripheral surface of the shaft portion 111. Each bearing 1 is a ball bearing. The pair of bearings 1 are arranged coaxially with each other. The pair of bearings 1 are arranged with a gap in between in the axial direction.

The pair of bearings 1 are the first bearing 1A and the second bearing 1B. The first bearing 1A is inserted into the cylindrical portion 121 from the rotating body 110 side. The first bearing 1A is in contact with the biasing member 101 and the collar 102. The biasing member 101 is a coil spring. The biasing member 101 is disposed on the opposite side of the rotating body 110 across the first bearing 1A. The biasing member 101 is inserted onto the shaft portion 111 of the rotating body 110 and is disposed coaxially with the central axis O. The biasing member 101 is disposed inside the cylindrical portion 121 in a compressed state. The biasing member 101 is in contact with the outer ring 20 (see FIG. 2) of the first bearing 1A and compressed. As a result, the biasing member 101 biases the first bearing 1A toward the rotating body 110 side with respect to the cylindrical portion 121. The collar 102 is disposed on the opposite side of the first bearing 1A from the biasing member 101. The collar 102 is interposed between the inner ring 10 of the first bearing 1A and the flange 113 of the fan 112.

The second bearing 1B is inserted into the cylindrical portion 121 from the opposite side of the rotating body 110. The outer ring 20 of the second bearing 1B is restricted from displacement toward the rotating body 110 by a stepped surface 122 on the inner peripheral surface of the cylindrical portion 121. The inner ring 10 of the second bearing 1B (see FIG. 2) contacts a C-ring 103 attached to the shaft portion 111, and is restricted from displacement in the direction away from the rotating body 110 relative to the shaft portion 111.

[First embodiment]
Fig. 2 is a plan view of the rolling bearing of the first embodiment. Fig. 3 is a longitudinal sectional view of the rolling bearing of the first embodiment, showing a section taken along line III-III in Fig. 2. Note that Fig. 2 shows a resin cover 60, which will be described later, in a partially cutaway view.
1, 2 and 3, the pair of bearings 1 have the same configuration. Each bearing 1 includes an inner ring 10 and an outer ring 20 which are raceways, a plurality of rolling elements 30, a cage 40, a pair of seal members 50, and a resin cover 60. The inner ring 10 and the outer ring 20 share a common central axis O.

The inner ring 10 is provided as a rotating ring. The inner ring 10 is fitted onto the shaft portion 111. The outer ring 20 is provided as a fixed ring. The outer ring 20 surrounds the inner ring 10 from the outside in the first radial direction, with an annular space provided between the inner ring 10 and the outer ring 20. The multiple rolling elements 30 are disposed between the inner ring 10 and the outer ring 20, and are held by the retainer 40 so that they can roll. The retainer 40 holds each rolling element 30 rotatably, with the multiple rolling elements 30 evenly arranged in the first circumferential direction. The seal member 50 covers the annular space between the inner ring 10 and the outer ring 20 from the outside in the axial direction.

The outer ring 20 is formed in an annular shape from a metal material such as stainless steel or bearing steel. The outer ring 20 has an outer ring body 21 whose axial width is equal to the axial width of the inner ring 10, and a protruding portion 22 that protrudes from the outer ring body 21 toward the inside in the first radial direction and extends over the entire first circumferential direction. The outer ring body 21 has an inner circumferential surface 21a that extends axially inward from the opening edge of the outer ring 20. The protruding portion 22 is formed in a portion of the outer ring body 21 that is located at the center of the axial direction. The axial width of the protruding portion 22 is shorter than the axial width of the outer ring body 21 and is larger than the outer diameter of the rolling element 30.

An outer ring raceway surface 23 is formed on the inner circumferential surface of the protruding portion 22, recessed outward in the first radial direction. The outer ring raceway surface 23 is formed hemispherically in cross section so as to conform to the outer surface of the rolling elements 30, and is formed in an annular shape extending in the first circumferential direction around the entire circumference of the inner circumferential surface of the protruding portion 22. The outer ring raceway surface 23 is formed on a portion of the inner circumferential surface of the protruding portion 22 that is located in the center in the axial direction. The portion of the inner circumferential surface of the protruding portion 22 excluding the outer ring raceway surface 23 extends in the axial direction with a constant inner diameter.

The outer ring 20 has an outer peripheral surface 25 and a pair of end faces 26. The outer peripheral surface 25 faces the opposite side of the inner ring 10. The outer peripheral surface 25 coincides with the outer peripheral surface of the outer ring body 21. The end faces 26 face outward in the axial direction. The end faces 26 coincide with the end faces of the outer ring body 21 facing outward in the axial direction. The end faces 26 have a constant width in the first radial direction and extend in the first circumferential direction. The end faces 26 are the portions that extend from the outer peripheral edge of the outer ring 20 to the inner peripheral edge of the outer ring body 21 when viewed from the axial direction. In the illustrated example, the axial end of the outer ring 20 is chamfered, but the chamfered portions are included in the end faces 26.

The inner ring 10 is formed in an annular shape from a metal material such as stainless steel or bearing steel. The outer peripheral surface of the inner ring 10 is formed with an inner ring raceway surface 11 that is recessed inward in the first radial direction. The inner ring raceway surface 11 is formed in a hemispherical shape in cross section so as to follow the outer surface of the rolling elements 30, and is formed in an annular shape extending in the first circumferential direction around the entire circumference of the outer peripheral surface. The inner ring raceway surface 11 is formed in a portion of the outer peripheral surface of the inner ring 10 that is located in the center in the axial direction, and is arranged to face the outer ring raceway surface 23 in the first radial direction. The portion of the outer peripheral surface of the inner ring 10 other than the inner ring raceway surface 11 extends in the axial direction with a constant outer diameter.

The inner ring 10 has an inner peripheral surface 15 and a pair of end faces 16. The inner peripheral surface 15 faces the opposite side of the outer ring 20. The end faces 16 face outward in the axial direction. The end faces 16 have a constant width in the first radial direction and extend in the first circumferential direction. The end faces 16 are the portions that extend from the inner peripheral edge to the outer peripheral edge of the inner ring 10 when viewed in the axial direction.

The multiple rolling elements 30 are formed into a spherical shape from a metal material such as stainless steel or bearing steel. The multiple rolling elements 30 are disposed between the outer ring raceway surface 23 and the inner ring raceway surface 11, and are supported by the outer ring raceway surface 23 and the inner ring raceway surface 11 so as to be able to roll. The multiple rolling elements 30 are spaced apart in the first circumferential direction by the cage 40.

As shown in FIG. 3, the retainer 40 is made of synthetic resin or metal material and is generally annular. The retainer 40 is arranged coaxially with the central axis O. The retainer 40 includes an annular portion 41 that is annular and arranged below the rolling elements 30, and a plurality of column portions 42 that protrude upward from the annular portion 41 and are arranged at intervals in the first circumferential direction. The column portions 42 are arranged evenly in the first circumferential direction. A pair of column portions 42 adjacent to each other in the first circumferential direction forms a ball pocket between them. The ball pocket penetrates the retainer 40 in the first radial direction and opens upward at the upper end surface of the retainer 40. The ball pockets are provided in accordance with the number of the rolling elements 30 and hold the rolling elements 30 so that they can roll individually. As a result, the retainer 40 arranges the rolling elements 30 evenly at intervals in the first circumferential direction.

2 and 3, the seal member 50 is formed in a circular plate shape. The seal member 50 is arranged coaxially with the central axis O. The seal member 50 is attached to the outer ring 20. The seal member 50 is arranged on both sides of the rolling elements 30 in the axial direction. The seal member 50 includes a base portion 51 that overlaps the protruding portion 22 of the outer ring 20 from the outside in the axial direction, a step portion 52 that extends from the inner peripheral edge of the base portion 51 to the outside in the axial direction, a cover portion 53 that protrudes inward in the first radial direction from the axially outer end edge of the step portion 52, and a locking portion 54 that extends outward in the first radial direction and outward in the axial direction from the outer peripheral edge of the base portion 51. The seal member 50 extends in the first radial direction so as to straddle at least the center of the rolling elements 30 in a plan view. The inner peripheral edge of the cover portion 53 is arranged on the outer peripheral surface of the inner ring 10 with a gap therebetween. The outer peripheral edge of the locking portion 54 is locked to the inner peripheral surface 21a of the outer ring body 21 from the inside in the axial direction. This fixes the seal member 50 to the outer ring 20.

FIG. 4 is a plan view of the outer ring and the resin cover according to the first embodiment.
As shown in Figs. 3 and 4, the resin cover 60 is attached to the outer ring 20 so that it cannot be displaced relative to the outer ring 20. The resin cover 60 is made of an insulating resin material. The resin cover 60 is preferably made of polybutylene terephthalate (PBT) or polyphenylene sulfide (PPS), which has low moisture absorption, is easy to mold with high precision, and has excellent chemical resistance. In addition, potassium titanate whiskers are preferably added to the resin as a reinforcing material. The potassium titanate whiskers are preferably mixed in an amount of 5% to 40%, and more preferably 10% to 30%. It is preferable not to add glass fiber or carbon fiber to the resin as a reinforcing material. If hard glass fiber or carbon fiber is added to the resin, it is difficult to process the resin cover after insert molding when finishing it by machining such as centerless machining, and it is likely to damage the grinding wheel or cutting tool. On the other hand, potassium titanate whiskers are softer than glass fiber or carbon fiber, and are small in both diameter and length, making them easy to machine. Resins containing potassium titanate whiskers are easier to machine than resins alone.

The resin cover 60 is formed in a cylindrical shape. The resin cover 60 includes a peripheral wall portion 61 that covers the outer peripheral surface 25 of the outer ring 20, and a pair of flange portions 62 that are connected to the peripheral wall portion 61 and cover the end face 26 of the outer ring 20. The peripheral wall portion 61 covers the entire outer peripheral surface 25 of the outer ring 20 from the outside in the first radial direction. The peripheral wall portion 61 extends in the axial direction with a constant outer diameter. The pair of flange portions 62 are formed in the same shape as each other when viewed in the axial direction. The flange portions 62 protrude inward in the first radial direction from the axial end portion of the peripheral wall portion 61. The flange portions 62 extend all around the center axis O. The flange portions 62 are portions that extend inward in the first radial direction from a position that overlaps with the outer peripheral edge of the end face 26 of the outer ring 20 when viewed in the axial direction. That is, the peripheral wall portion 61 protrudes outward in the axial direction from the outer ring 20 and is connected to the outer peripheral edge of the flange portions 62.

The inner peripheral edge 62a of the flange portion 62 is circular with the axis P extending in the axial direction as the center. In the following description, the direction extending radially from the axis P perpendicular to the axis P is referred to as the second radial direction, and the direction circling around the axis P is referred to as the second circumferential direction. In this embodiment, the axis P coincides with the central axis O. Therefore, the second radial direction coincides with the first radial direction, and the second circumferential direction coincides with the first circumferential direction. The inner diameter of the flange portion 62 is larger than the inner diameter of the end face 26 of the outer ring 20. As a result, the inner peripheral edge 62a of the flange portion 62 is located outside the inner peripheral edge of the end face 26 of the outer ring 20 in the first radial direction, and has a gap around the entire circumference with respect to the inner peripheral edge of the end face 26 of the outer ring 20. However, the axis P may be shifted in the first radial direction with respect to the central axis O due to a positional deviation during manufacturing, which will be described later. In this case, a portion of the inner peripheral edge 62a of the flange portion 62 may be in contact with the inner peripheral edge of the end face 26 of the outer ring 20 when viewed in the axial direction.

The flange portion 62 has an opening 63. A plurality of openings 63 (eight in the illustrated example) are provided at equal intervals in the second circumferential direction. All openings 63 are formed to have the same shape. The shape of the opening 63 when viewed from the axial direction has a constant width in the second radial direction and extends in the second circumferential direction. However, the shape of the opening 63 is not particularly limited. The opening 63 penetrates the flange portion 62 in the axial direction to expose the end face 26 of the outer ring 20. The opening 63 opens at the inner peripheral edge 62a of the flange portion 62 and opens inward in the second radial direction. The entire opening 63 is located inside the outer peripheral edge of the flange portion 62. The length of the opening 63 in the second circumferential direction is smaller than the distance in the second circumferential direction between adjacent openings 63.

FIG. 5 is an enlarged view of a portion V in FIG.
As shown in FIG. 5, the flange portion 62 has an opening forming region 65 in which all the openings 63 are formed. The opening forming region 65 has a constant width in the second radial direction and extends over the entire circumference in the second circumferential direction, and is an annular region centered on the axis P when viewed from the axial direction. The opening forming region 65 includes all the openings 63 as a whole, and is defined as a range in which at least one opening 63 is inscribed. For this reason, in this embodiment, the outer peripheral edge of the opening forming region 65 contacts all the openings 63 from the outside in the second radial direction, and the inner peripheral edge of the opening forming region 65 coincides with the inner peripheral edge 62a of the flange portion 62. That is, the opening forming region 65 is an annular region sandwiched between the arc-shaped virtual line L1 shown in FIG. 5 and the inner peripheral edge 62a of the flange portion 62. The total area of the openings 63 is smaller than half the area of the opening forming region 65.

The flange portion 62 has a covering region 66 adjacent to the opening forming region 65 in the second radial direction. The covering region 66 extends over the entire circumference in the second circumferential direction. The covering region 66 is located on the peripheral wall portion 61 side (i.e., outside in the second radial direction) of the opening forming region 65 in the second radial direction, and is adjacent to the opening forming region 65 over the entire circumference. The entire covering region 66 covers the end face 26 of the outer ring 20. The covering region 66 is defined as a range that covers the end face 26 of the outer ring 20. Therefore, the outer peripheral edge of the covering region 66 coincides with the outer peripheral edge of the end face 26 of the outer ring 20 when viewed from the axial direction, and the inner peripheral edge of the covering region 66 coincides with the outer peripheral edge of the opening forming region 65. That is, the covering region 66 is an annular region sandwiched between the arc-shaped virtual line L1 shown in FIG. 5 and the outer peripheral edge of the end face 26 of the outer ring 20.

FIG. 6 is an enlarged view showing a portion VI in FIG.
As shown in Fig. 6, the bearing 1 is arranged such that the opening 63 of the flange portion 62 is fitted into the base portion 120 of the fan motor 100 so as to be unable to rotate relative to the base portion 120. In the base portion 120, protrusions 125 are formed on a stepped surface 122 on the inner circumferential surface of a cylindrical portion 121 as fitted portions that fit into the openings 63 of the flange portion 62 of the bearing 1. The protrusions 125 are inserted into the openings 63 in a one-to-one relationship. The protrusions 125 are provided on the stepped surface 122 in the same number as or less than the number of openings 63. It is desirable that each protrusion 125 is formed such that there is substantially no gap in the first circumferential direction and the first radial direction with respect to the openings 63 into which the protrusions 125 are inserted.

The resin cover 60 is insert-molded integrally with the outer ring 20. The mold 70 for insert-molding the resin cover 60 will be described in detail.
FIG. 7 is a diagram illustrating the method for manufacturing the rolling bearing of the first embodiment, and is a cross-sectional view illustrating a cut surface including the axis P of the outer ring and the die.
7, the mold 70 has a fixed-side cavity 71, a movable-side cavity 72, a core pin 73, and an ejector sleeve 74. With the outer ring 20 fitted onto the core pin 73, the fixed-side cavity 71 is aligned with the core pin 73 and the movable-side cavity 72 to form a cavity corresponding to the resin cover 60 around the outer ring 20. The reference symbol PL in the figure indicates a parting line.

The core pin 73 is formed in a cylindrical shape centered on the axis P. The core pin 73 is inserted inside the outer ring 20 and supports the inner peripheral surface of the outer ring 20. In this embodiment, the core pin 73 supports the inner peripheral surface of the protruding portion 22 of the outer ring 20. When the core pin 73 supports the outer ring 20 coaxially, the central axis O and the axis P coincide in the molded product. On the other hand, when the core pin 73 supports the outer ring 20 in an eccentric state due to the difference between the outer diameter of the core pin 73 and the inner diameter of the outer ring 20, the central axis O and the axis P differ from each other in the molded product. The core pin 73 is abutted against the fixed side cavity 71.

The movable side cavity 72 is arranged to surround the core pin 73. The movable side cavity 72 has a cavity C1 that faces the outer peripheral surface 25 of the outer ring 20. The cavity C1 corresponds to the peripheral wall portion 61 of the resin cover 60. The movable side cavity 72 abuts against the fixed side cavity 71.

The ejector sleeve 74 is formed in a cylindrical shape centered on the axis P. The ejector sleeve 74 is fitted onto the core pin 73 and is interposed between the core pin 73 and the movable cavity 72. The ejector sleeve 74 has an inner peripheral portion 75 and a pin portion 76 that are abutted against the first end face 26A of the outer ring 20, and a cavity C2 that faces the first end face 26A of the outer ring 20. The inner peripheral portion 75 extends in the second circumferential direction with a constant width when viewed from the axial direction. The inner peripheral portion 75 is in close contact with the first end face 26A of the outer ring 20 over the entire circumference. The inner peripheral portion 75 forms the inner peripheral edge 62a of the flange portion 62. A plurality of pin portions 76 are provided in the circumferential direction. The pin portion 76 is connected to the inner peripheral portion 75. The pin portion 76 protrudes outward in the second radial direction from the inner peripheral portion 75. The pin portions 76 are provided at equal intervals in the second circumferential direction. The pin portions 76 abut against the first end face 26A of the outer ring 20. The pin portions 76 abut against a location on the inside in the first radial direction from the outer peripheral edge of the first end face 26A of the outer ring 20. The pin portions 76 form the opening 63 of the flange portion 62. Therefore, the pin portions 76 have a constant width in the second radial direction corresponding to the shape of the opening 63 and extend in the second circumferential direction. The length of the pin portions 76 in the second circumferential direction is smaller than the interval in the second circumferential direction between adjacent pin portions 76. The cavity C2 corresponds to the flange portion 62 of the resin cover 60 facing the first end face 26A of the outer ring 20. The cavity C2 is located on the second radial outside of the inner peripheral portion 75 and around the pin portions 76. The cavity C2 communicates with the cavity C1 of the movable side cavity 72.

The fixed side cavity 71 supports the second end face 26B of the outer ring 20 on the parting line PL. The fixed side cavity 71 has a cavity C3 that faces the second end face 26B of the outer ring 20 and a gate 77 that communicates with the cavity C3. The cavity C3 corresponds to the flange portion 62 of the resin cover 60 that faces the second end face 26B of the outer ring 20. The cavity C3 communicates with the cavity C1 of the movable side cavity 72. The fixed side cavity 71 is in close contact with the second end face 26B of the outer ring 20 over the entire circumference on the second radial inner side of the cavity C3. The fixed side cavity 71 has a fixed side pin portion 78 that abuts against the second end face 26B of the outer ring 20 to form an opening 63 of the flange portion 62 in order to make the cavity C3 correspond to the flange portion 62.

As described above, in the bearing 1 of this embodiment, the flange portion 62 of the resin cover 60 has a constant width in the second radial direction and extends around the entire circumference, and has an opening forming region 65 in which an opening 63 that exposes the end face 26 of the outer ring 20 is formed. In addition, the outer ring 20 is embedded in the resin cover 60 by insert molding using a mold 70 having a core pin 73 that holds the outer ring 20 alone and an ejector sleeve 74 that has a plurality of pin portions 76 in the circumferential direction that abut against the end face 26 of the outer ring 20. With this configuration, when the resin cover 60 is insert molded integrally with the outer ring 20, the pin portions 76 of the ejector sleeve 74 can abut against the portions of the end face 26 of the outer ring 20 that are exposed by the openings 63. Therefore, even if sufficient space is not secured for contacting the ejector sleeve 74 around the portion of the end face 26 of the outer ring 20 that is covered by the flange portion 62 of the resin cover 60 (the inner peripheral portion of the end face 26) of the end face 26 of the outer ring 20 to allow the outer ring 20 to shift in the second radial direction from the desired position within the mold 70, the pin portion 76 of the ejector sleeve 74 can be abutted against the end face 26 of the outer ring 20 to position the outer ring 20 in the desired orientation within the mold 70. Therefore, the resin cover 60 for preventing electrolytic corrosion can be attached to the outer ring 20 with high precision.

In addition, because a cavity C2 is formed on both sides of the pin portion 76 of the mold 70 in the second circumferential direction, resin is disposed on both sides of the opening 63 in the opening formation region 65 in the second circumferential direction. Therefore, although the area of the end face 26 of the outer ring 20 covered by the flange portion 62 is reduced by providing the pin portion 76 on the ejector sleeve 74 to form the opening 63, the flange portion 62 can cover the end face 26 of the outer ring 20 over a wide area in the second radial direction. Therefore, the insulating performance of the flange portion 62 can be ensured.

In addition, since there is no need to secure sufficient space around the portion of the end face 26 of the outer ring 20 that is covered by the flange portion 62 (the inner periphery of the end face 26) for the ejector sleeve 74 to come into contact with, it is possible to arrange the flange portion 62 over a wide area in the second radial direction. Therefore, the flange portion 62 can ensure insulation of the outer ring 20 from the biasing member 101, etc. that faces the end face 26 of the outer ring 20, and the contact between the flange portion 62 and the biasing member 101, etc. can be stabilized.

Furthermore, when the resin cover 60 is insert-molded integrally with the outer ring 20, the core pin 73 holds the outer ring 20 alone, so unlike when the core pin holds the assembled bearing, the outer ring 20 to which the resin cover 60 is attached can be stabilized within the mold 70. Therefore, the resin cover 60 can be attached to the outer ring 20 with high precision.

The flange portion 62 further has a covering region 66 that is adjacent to the opening forming region 65 in the second radial direction and extends around the entire circumference, completely covering the end face 26 of the outer ring 20. With this configuration, the portions of the flange portion 62 located on both sides of the opening 63 in the second circumferential direction are connected by the covering region 66 of the flange portion 62. Therefore, the strength of the opening forming region 65 of the flange portion 62 can be ensured. In addition, the mechanical strength and friction strength against contact between the flange portion 62 and the biasing member 101, etc. can be ensured.

The total area of the opening 63 is smaller than half the area of the opening formation region 65. This configuration ensures the strength of the opening formation region 65. It also ensures mechanical strength and resistance to friction against contact between the flange portion 62 and the biasing member 101, etc.

The opening 63 opens into the inner peripheral edge 62a of the flange portion 62 on the opposite side to the peripheral wall portion 61. With this configuration, during injection molding (insert molding), the resin that flows from the cavity C1 corresponding to the peripheral wall portion 61 of the mold 70 to the cavities C2 and C3 corresponding to the flange portion 62 does not need to flow into the narrow cavity on the opposite side of the peripheral wall portion 61 from the opening 63. This makes it easier to mold the resin cover 60.

When viewed from the axial direction, the flange portion 62 has a gap around the entire circumference relative to the inner peripheral edge of the end face 26 of the outer ring 20. This configuration makes it possible to prevent resin from flowing from the cavities C2 and C3 corresponding to the flange portion 62 across the inner peripheral edge of the end face 26 of the outer ring 20 to the opposite side of the cavity C1 corresponding to the peripheral wall portion 61 in the radial direction (the radially inner side of the outer ring 20) during injection molding (insert molding). This makes it possible to prevent molding defects from occurring in the manufacturing process of the resin cover 60, and ultimately to reduce the manufacturing costs of the bearing 1.

The openings 63 are arranged at equal intervals in the second circumferential direction. This configuration makes it possible to prevent deviations in the center of gravity of the bearing 1 caused by providing the openings 63 in the resin cover 60.

The pair of flanges 62 are formed to have the same shape when viewed in the axial direction. With this configuration, the appearance of the bearing 1 is roughly symmetrical on the front and back. This eliminates the need to distinguish between the front and back of the bearing 1 and install it on the base 120 of the fan motor 100.

The fan motor 100 of this embodiment is equipped with a bearing 1 to which a resin cover 60 is attached to prevent electrolytic corrosion, so that an increase in the rotational resistance of the bearing 1 due to electrolytic corrosion can be suppressed. Therefore, a longer life for the fan motor 100 can be achieved.

Furthermore, the opening 63 of the resin cover 60 fits into the base 120 so that it cannot rotate relative to the base 120. With this configuration, it is possible to restrict the rotation of the outer ring 20 relative to the base 120. Furthermore, since the resin cover 60 is provided with a fitting structure with the base 120, the workability of the outer ring 20 is improved and the decrease in the roundness of the outer ring 20 due to forming it into a complex shape can be suppressed compared to when a fitting structure with the base 120 is provided on a metal outer ring 20. Therefore, it is possible to suppress the occurrence of slippage of the outer ring 20 while suppressing the decrease in accuracy of the bearing 1.

In the first embodiment, the flange portion 62 has a covered region 66, but the flange portion does not have to have a covered region. In this case, the opening forming region is the entire flange portion. Even in this case, the portions of the flange portion located on both sides of the opening in the second circumferential direction are connected by the peripheral wall portion of the resin cover. Therefore, the above-mentioned action and effect are achieved.

Furthermore, the peripheral wall portion 61 of the resin cover 60 may be formed with a recess that is continuous with the opening 63. Below, a modified example in which a recess is formed in the peripheral wall portion 61 will be described.

FIG. 8 is a plan view of an outer ring and a resin cover according to a first modified example of the first embodiment, and is an enlarged view corresponding to FIG. 5.
As shown in Fig. 8, a recess 64 is formed on an end surface of the peripheral wall portion 61 of the resin cover 60 facing outward in the axial direction. The recess 64 is connected to the opening 63 on the inside in the first radial direction. The recess 64 is formed so as to extend the opening 63 outward in the second radial direction. In this modification, the recess 64 has a gap in the first radial direction with respect to the outer circumferential surface of the peripheral wall portion 61. For example, the depth of the recess 64 is equal to the depth of the opening 63.

This modified example provides the same effects as the first embodiment. Furthermore, since the recess 64 connected to the opening 63 is formed on the end face of the peripheral wall 61, it is possible to insert the protrusion 125 provided on the base 120 of the fan motor 100 from the opening 63 to the recess 64. Therefore, the outer ring 20 can be more reliably prevented from rotating relative to the base 120.

FIG. 9 is a plan view of an outer ring and a resin cover according to a second modified example of the first embodiment, and is an enlarged view corresponding to FIG.
9, this modification differs from the first modification in that the recess 64 is open across the end face and the outer circumferential face of the peripheral wall portion 61. Even with this configuration, the same effects as those of the first modification can be achieved.

[Second embodiment]
Next, a second embodiment will be described with reference to Fig. 10. The second embodiment differs from the first embodiment in that the opening 163 of the resin cover 160 does not open to the inner peripheral edge 162a of the flange portion 162. Note that the configuration other than that described below is the same as that of the first embodiment.

FIG. 10 is a plan view of the outer ring and the resin cover of the second embodiment.
As shown in Fig. 10, an opening 163 is formed in the flange portion 162 instead of the opening 63 of the first embodiment. The shape of the opening 163 when viewed from the axial direction is circular. However, the shape of the opening 163 is not particularly limited. The opening 163 penetrates the flange portion 162 in the axial direction to expose the end face 26 of the outer ring 20. The entire opening 163 is located inside the outer circumferential edge of the flange portion 162 and outside the inner circumferential edge 162a of the flange portion 162.

FIG. 11 is an enlarged view of a portion XI in FIG.
As shown in FIG. 11, the flange portion 162 has an opening forming region 165, an outer peripheral covering region 166A, and an inner peripheral covering region 166B. The opening forming region 165 is defined in the same manner as the opening forming region 65 of the first embodiment. In this embodiment, the inner peripheral edge of the opening forming region 165 contacts all the openings 163 from the inside in the second radial direction, and is located outside the inner peripheral edge 162a of the flange portion 162 in the second radial direction. That is, the opening forming region 165 is an annular region sandwiched between the arc-shaped virtual lines L2 and L3 shown in FIG. 11. The total area of the openings 163 is smaller than half the area of the opening forming region 165.

The outer peripheral covering region 166A is configured in the same manner as the covering region 66 of the first embodiment. That is, the outer peripheral covering region 166A is an annular region sandwiched between the arc-shaped virtual line L2 shown in FIG. 11 and the outer peripheral edge of the end face 26 of the outer ring 20. The inner peripheral covering region 166B extends over the entire circumference in the second circumferential direction. The inner peripheral covering region 166B is located on the opposite side of the peripheral wall portion 61 in the second radial direction of the opening forming region 165 (i.e., on the inside in the second radial direction) and is adjacent to the opening forming region 165 over the entire circumference. The entire inner peripheral covering region 166B covers the end face 26 of the outer ring 20. The inner peripheral covering region 166B is defined as a range that covers the end face 26 of the outer ring 20. Therefore, the outer peripheral edge of the inner peripheral covering region 166B coincides with the inner peripheral edge of the opening forming region 165, and the inner peripheral edge of the inner peripheral covering region 166B coincides with the inner peripheral edge 162a of the flange portion 162. In other words, the inner peripheral covering region 166B is an annular region sandwiched between the arc-shaped virtual line L3 shown in FIG. 11 and the inner peripheral edge 162a of the flange portion 162.

This embodiment has the same effects as the first embodiment. In addition, in this embodiment, the flange portion 162 has an inner peripheral covering region 166B adjacent to the opening forming region 165 on the opposite side of the peripheral wall portion 61 in the second radial direction. With this configuration, the portions of the flange portion 162 located on both sides of the opening 163 in the second radial direction are connected by both the outer peripheral covering region 166A and the inner peripheral covering region 166B. Therefore, the strength of the opening forming region 165 of the flange portion 162 can be further improved.

In the second embodiment, the flange portion 162 has an outer peripheral covering region 166A, but the flange portion does not have to have an outer peripheral covering region. Even in this case, the portions of the flange portion located on both sides of the opening in the second circumferential direction are connected by both the inner peripheral covering region 166B and the peripheral wall portion of the flange portion. Therefore, the above-mentioned action and effect are achieved.

[Third embodiment]
Next, a third embodiment will be described with reference to Fig. 12. The third embodiment differs from the first embodiment in that a resin cover 260 is attached to the inner ring 10. Note that the configuration other than that described below is the same as that of the first embodiment.

FIG. 12 is a vertical sectional view of a rolling bearing according to the third embodiment.
As shown in FIG. 12, the resin cover 260 includes a peripheral wall portion 261 that covers the inner peripheral surface 15 of the inner ring 10, and a pair of flange portions 262 that are connected to the peripheral wall portion 261 and cover the end face 16 of the inner ring 10. The peripheral wall portion 261 covers the entire inner peripheral surface 15 of the inner ring 10 from the inside in the first radial direction. The peripheral wall portion 261 extends in the axial direction with a constant inner diameter. The pair of flange portions 262 are formed to have the same shape as each other when viewed in the axial direction. The flange portions 262 protrude outward in the first radial direction from the axial end portion of the peripheral wall portion 261. The flange portions 262 extend all around the center axis O. The flange portions 262 are portions that extend outward in the first radial direction from a position that overlaps with the inner peripheral edge of the end face 16 of the inner ring 10 when viewed in the axial direction.

The outer peripheral edge 262a of the flange portion 262 is circular with the axis P extending in the axial direction as the center. The flange portion 262 has an opening 263 formed therein. A plurality of openings 263 are provided at equal intervals in the second circumferential direction. All openings 263 are formed in the same shape. The openings 263 penetrate the flange portion 262 in the axial direction to expose the end face 16 of the inner ring 10. The openings 263 open at the outer peripheral edge 262a of the flange portion 262 and open outward in the second radial direction. The entire opening 263 is located outside the inner peripheral edge of the flange portion 262. As a result, the flange portion 262 has an opening forming region and a covering region, similar to the flange portion 62 of the first embodiment. As described above, the present embodiment has the same effect as the first embodiment.

The present invention is not limited to the above-described embodiment explained with reference to the drawings, and various modifications are possible within the technical scope of the present invention.
For example, in the above embodiment, a fan motor is exemplified as a rotating device, but the rotating device is not limited to this. For example, the present invention may be applied to a dental handpiece, a spindle motor of a hard disk drive, or the like as a rotating device. Also, in the above embodiment, the inner ring 10 is provided as a rotating ring, and the outer ring 20 is provided as a fixed ring. However, the inner ring may be provided as a fixed ring, and the outer ring may be provided as a rotating ring.

In each of the above embodiments, the pair of flange portions 62 are formed to have the same shape as each other when viewed from the axial direction, but this configuration is not limited to this. For example, an opening may be formed in only one of the flange portions.

In addition, in each of the above embodiments, a distinction is made between the first radial direction and the second radial direction, but since the eccentricity of the central axis O and the axis P is substantially small, the first radial direction and the second radial direction may be regarded as the same direction. The same is true for the first circumferential direction and the second circumferential direction.

In addition, the components in the above-described embodiments may be replaced with well-known components as appropriate without departing from the spirit of the present invention, and the above-described embodiments and variations may be combined as appropriate.

1...rolling bearing 10...inner ring 15...inner circumferential surface (circumferential surface) 16...end surface 20...outer ring 25...outer circumferential surface (circumferential surface) 26...end surface 30...rolling element 60, 160, 260...resin cover 61, 261...circumferential wall portion 62, 162, 262...flange portion 63, 163, 263...opening 65, 165...opening forming area 66...covered area 70...mold 73...core pin (core) 74...ejector sleeve 76...pin portion 100...fan motor (rotating device) 110...rotating body 120...base (mounted member, support) 166A...outer circumferential covered area (covered area) 166B...inner circumferential covered area (covered area)

Claims (11)

An inner ring and an outer ring arranged coaxially with each other;
A rolling element disposed between the inner ring and the outer ring;
a resin cover attached to one of the inner ring and the outer ring;
Equipped with
The one raceway is
a circumferential surface facing the opposite side of the other of the inner ring and the outer ring;
An end face facing an axial direction;
having
The resin cover is
A peripheral wall portion covering the peripheral surface;
a flange portion connected to the peripheral wall portion and covering the end surface;
having
The flange portion has a constant width in a radial direction, extends around the entire circumference, and has an opening forming region in which an opening exposing the end surface is formed.
Rolling bearing. The flange portion further includes a covering region adjacent to the opening forming region in the radial direction, extending around the entire circumference, and entirely covering the end surface.
2. The rolling bearing according to claim 1. The total area of the opening is smaller than half the area of the opening formation region.
3. The rolling bearing according to claim 1 or 2. The opening is open to a peripheral edge of the flange portion opposite to the peripheral wall portion.
3. The rolling bearing according to claim 1 or 2. The covering region is adjacent to the opening forming region on the opposite side of the peripheral wall portion in the radial direction.
3. The rolling bearing according to claim 2. The flange portion has a gap over the entire circumference with respect to a peripheral edge on the opposite side of the peripheral surface of the end face when viewed in the axial direction.
3. The rolling bearing according to claim 1 or 2. The openings are arranged at equal intervals in the circumferential direction.
3. The rolling bearing according to claim 1 or 2. The flange portion is
a first flange portion covering a first end face of the one of the bearing rings;
a second flange portion covering a second end face of the one of the raceways;
having
The first flange portion and the second flange portion are formed to have the same shape as each other when viewed in the axial direction.
3. The rolling bearing according to claim 1 or 2. The one raceway is attached to a member to be attached,
The opening is fitted to the mounting member so as not to rotate relative to the mounting member.
3. The rolling bearing according to claim 1 or 2. A rotating body that is rotatably arranged;
A support that rotatably supports the rotating body;
The rolling bearing according to claim 1 or 2, which is interposed between the rotating body and the support body;
A rotating device comprising: A method for manufacturing a rolling bearing, comprising insert-molding a resin cover that is attached to a raceway of the rolling bearing and covers a peripheral surface and an end surface of the raceway, integrally with the raceway, the method comprising the steps of:
A core for holding the bearing ring alone;
an ejector sleeve having a plurality of pin portions in a circumferential direction that are abutted against the end surface;
and embedding the raceway in the resin cover using a mold having the above structure.

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