JP2013068264A - Retainer for rolling bearing and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retainer for rolling bearing which makes the accuracy of dimensions of a retainer higher, improves the deficiency of strength, improves the adhesiveness of retainer constitutional members and further can be applied to various shapes of the retainer, and to provide a method for manufacturing the retainer for rolling bearing.SOLUTION: The retainer for rolling bearing is made by subjecting resin material to insertion molding together with a core metal 1 by using a mold. In the retainer for rolling bearing, the core material 1 is embedded in a resin part 2 made of the resin material and support site exposure parts 16 in which support sites 6 for supporting the core metal 1 are exposed in a cavity of the mold are disposed on a plurality of sites.

Description

  The present invention relates to a rolling bearing retainer and a method for manufacturing the same, and to a technique in which a resin material is insert-molded together with a core metal.

  As a resin cage used for a bearing, there are, for example, one in which only a resin material is insert-molded, and one in which a resin material is insert-molded together with an insert member made of an iron plate or the like (Patent Documents 1 to 5). Among these, the cage shown in FIG. 12 is provided with an insert member 51 on the bottom surface 50 on the back side of the pocket Pt in the resin-made crown cage. The cage shown in FIG. 13 is provided with an insert member 52 on the side surface of the crown type cage.

JP-A-8-145041 Japanese Patent Laid-Open No. 9-79265 JP 2003-120684 A JP 2007-278418 A JP 2007-298164 A

The resin cage in which only the above-described resin material is insert-molded has the following problems.
-The surface of the molded product was undesirably dented, and it was difficult to manufacture the cage with high dimensional accuracy.
-At the time of molding, a resin bond portion, that is, a weld line was generated, and the strength might be insufficient.

In the resin cage shown in FIGS. 11 and 12, the insert members 51 and 52 must be supported in the mold cavity during insert molding. Therefore, the insert members 51 and 52 cannot be embedded in the resin part, and are provided on the bottom surface or the side surface of the cage so that the support surfaces 51a and 52a are exposed on the surface of the cage. If the insert members 51 and 52 are provided only on the cage surface portion such as the cage bottom surface or side surface, it is caused by the difference in the linear expansion coefficient between the resin material and the insert member (iron plate) when the bearing is used. Thus, there is a risk that the strength of the bond with the resin may be insufficient, such as when the insert member is peeled off from the resin at high temperatures or when the insert member is peeled off from the resin due to vibration.
Further, with the conventional insert technology, only a crown-shaped cage in which a pocket is formed on one side surface of an annular body can be formed. For example, when insert-molding a ladder-shaped cage, it is difficult to form a pocket and the shape of the insert member is complicated.

  The object of the present invention is to improve the dimensional accuracy of the cage, to improve the lack of strength, to improve the adhesion of the cage component, and to be applied to various cage shapes. It is providing the rolling bearing retainer and its manufacturing method.

  The rolling bearing cage of the present invention is a rolling bearing cage in which a resin material is insert-molded with a core together with a metal mold, the core metal is embedded in the resin portion made of the resin material, and the resin portion is The support part exposure part which exposed the support part supported in the cavity of the said metal mold | die of the said metal core was provided in multiple places.

  According to this configuration, since the core metal is embedded in the resin portion, the strength of the entire cage is improved and the adhesion between the resin portion and the core metal is improved as compared with the configuration in which the core metal is provided on the surface of the resin portion. Can be achieved. For this reason, when the bearing is used, even if the coupling strength between one surface of the metal core and the resin part is reduced due to temperature rise or vibration of the cage, for example, the other surface of the metal core is in close contact with and supported by the resin part. Is done. Therefore, there is no possibility that the core metal is undesirably peeled from the resin portion. The cored bar is embedded in the resin part. Since the resin part is provided with a plurality of support portion exposed parts, the cored bar can be stably supported in the cavity, and insert molding can be performed. Furthermore, the ratio of the resin material in the entire cage can be reduced as compared with the cage made of only the resin material. As a result, sink marks or the like which are peculiar to the resin can be reduced, and the dimensional accuracy can be increased. Moreover, since it is the structure which embeds a metal core in a resin part and provides a support location exposed part, it can respond to various cage shapes unlike what provides a metal core on the cage surface.

  The resin portion includes an annular body and a plurality of support columns that extend in an axial direction from the annular body and form pockets that hold a rolling element therebetween. An annular body embedded portion embedded in the annular body and a plurality of support body embedded portions extending from the annular body embedded portion and embedded in each of the support columns may be provided. In this way, the cored bar is formed over the entire skeleton including the annular body and the columnar body by embedding the cored bar over the annular body of the resin portion and the respective columnar bodies. Therefore, the rigidity can be increased as compared with the conventional cage in which the insert member is provided on the bottom surface or the side surface of the back side of the pocket.

The cored bar may be a pressed product of a metal plate. In this case, the metal plate can be formed into a desired core metal shape by, for example, pressing such as punching, bending, or forming.
Each of the post embedded parts may be a bent piece that is bent with respect to the annular embedded part at the base end.
In these cases, it is possible to reduce the number of processing steps and manufacture the core bar at a lower cost than those obtained by processing the cored bar by cutting or the like.

  The support portion of the core metal may be a recessed portion formed on the outer side in the axial direction on the non-projecting side of the embedded portion in the support column in the annular embedded portion. In this case, the cored bar can be easily supported in the cavity of the mold simply by forming a recess in the cored bar without adding a dedicated part to the cored bar.

The cage may be formed in a ladder shape by a pair of annular bodies opposed to each other with an interval in the axial direction and a plurality of support bodies connected across the annular bodies.
The cage is formed in a crown shape by one annular body and a plurality of support pillars that form axial pockets extending from one side surface of the annular body to hold balls between them. It may be what was done.
The retainer is formed in a comb shape by one annular body and a plurality of support bodies that form a pocket extending axially from one side surface of the annular body to hold a roller therebetween. There may be.

In the rolling bearing retainer formed in the ladder shape, the cored bar is a combination of a pair of cored bar parts facing each other in the axial direction, and each of the cored bar divided bodies is formed in an annular body. You may have an embedding part and the support | pillar body embedding part extended in an axial direction from this annular body embedding part. In this case, it is possible to insert-mold by supporting the annular embedded part in each core metal split body on one or the other of the molds to be combined.
The cored bar may be configured such that the pair of cored bar divided bodies have the same shape and face each other in opposite directions. In this case, it becomes possible to make a pair of core metal division bodies into the same-shaped combined parts, and the production cost can be further reduced.

The mold has a fixed mold and a movable mold that is movable relative to the fixed mold over a mold open state and a mold clamped state, and in either or both of the fixed mold and the movable mold, It is also possible to provide a support protrusion that protrudes to support the support portion of the core metal. The movable mold is separated from the fixed mold and the mold is opened, and the supporting portion of the core metal is supported by the supporting protrusion protruding into the cavity. Thereafter, the cage can be molded by moving the movable mold to a clamped state, filling the cavity with a resin material, and curing the resin material.
The rolling bearing according to the present invention uses any one of the above cages.

The rolling bearing retainer manufacturing method according to the present invention is a rolling bearing retainer manufacturing method in which a resin material is insert-molded with a metal mold together with a metal core. The metal mold protrudes from the cavity and protrudes from the cavity. A core bar excluding a support part of the core metal supported by the support protrusion by having a support protrusion for supporting the support metal at least in two places in the circumferential direction, filling the cavity with a resin material, and curing the resin material. The support part exposed part, which is entirely embedded in the resin part and exposes the support part, is formed into a shape having the resin part.
According to this configuration, by embedding the entire core metal excluding the support portion of the core metal with the resin portion, the strength of the entire cage is improved and the resin portion and the core are improved compared to the configuration in which the core metal is provided on the surface of the resin portion. The adhesion with gold can be improved. The cored bar is embedded in the resin part. Since the resin part is provided with a plurality of support portion exposed parts, the cored bar can be stably supported in the cavity, and insert molding can be performed. Furthermore, the ratio of the resin material in the entire cage can be reduced as compared with the cage made of only the resin material. As a result, sink marks or the like which are peculiar to the resin can be reduced, and the dimensional accuracy can be increased. Moreover, since it is the structure which embeds a metal core in a resin part and provides a support location exposed part, it can respond to various cage shapes unlike what provides a metal core on the cage surface.

  The rolling bearing cage of the present invention is a rolling bearing cage in which a resin material is insert-molded with a core together with a metal mold, the core metal is embedded in the resin portion made of the resin material, and the resin portion is Since the support location exposed part that exposes the support location to be supported in the cavity of the mold of the core metal is provided at a plurality of locations, the dimensional accuracy of the cage is increased, and the lack of strength is improved. It is possible to improve the adhesion of the cage component and further apply to various cage shapes.

  The rolling bearing retainer manufacturing method of the present invention is a rolling bearing retainer manufacturing method in which a resin material is insert-molded with a metal mold together with a metal core. The metal mold protrudes from the cavity and protrudes from the cavity. A core bar excluding a support part of the core metal supported by the support protrusion by having a support protrusion for supporting the support metal at least in two places in the circumferential direction, filling the cavity with a resin material, and curing the resin material. The support part exposed part, which is entirely embedded in the resin part and exposes the support part, is formed into a shape having the resin part. For this reason, it is possible to increase the dimensional accuracy of the cage, to improve the strength shortage, to improve the adhesion of the cage component, and to apply to various cage shapes.

It is sectional drawing of the cage for rolling bearings concerning 1st Embodiment of this invention. It is the side view which carried out the partial fracture | rupture which looked at the same cage for rolling bearings from the axial direction. (A) is one side view which looked at the metal core of the cage for rolling bearings from one side in the axial direction, and (B) is a perspective view schematically showing the metal core. (A) is a sectional view taken along line IV (A) -IV (A) in FIG. 1, and (B) is a sectional view taken along line IV (B) -IV (B) in FIG. It is an expanded sectional view of the principal part of the cage for rolling bearings. It is a figure which shows the support process which supported the metal core of the cage for rolling bearings to the metal mold | die. It is an expanded sectional view which expands and shows the support location of a concentric bar. It is a figure which shows the covering process filled with the resin material in the cavity of the metal mold | die. It is sectional drawing of the cage for rolling bearings concerning other embodiment of this invention. It is sectional drawing of the cage for rolling bearings concerning further another embodiment of this invention. It is sectional drawing of the cage for rolling bearings concerning further another embodiment of this invention. It is a perspective view of the cage for rolling bearings of a prior art example. It is a perspective view of the cage for rolling bearings of other conventional examples.

  A rolling bearing retainer according to a first embodiment of the present invention will be described with reference to FIGS. The following description also includes a description of a method for manufacturing a rolling bearing cage. The cage according to this embodiment is a cage for a cylindrical roller bearing of a radial bearing, and holds a plurality of rollers, which are rolling elements, rotatably at regular intervals in the circumferential direction. As shown in FIG. 1, this cage is a so-called ladder-type cage, which is formed by insert molding a resin material together with a core metal with a mold (described later), and includes the core metal 1 and the resin material. And a resin portion 2. Among these, the cored bar 1 has a support portion 6 to be supported in the cavity of the mold, and the entire cored bar excluding the support point 6 is embedded in the resin portion 2. The resin part 2 has a pair of annular bodies 2A and a plurality of support bodies 2B. In the resin portion 2, each of the annular bodies 2A is provided with support location exposed portions 16 described later at a plurality of locations. The plurality of pillars 2B extend in the axial direction from the annular body 2A, and form a pocket Pt for holding the rolling element T therebetween, as shown in FIG.

  As shown in FIG. 1, the cored bar 1 is a combination of a pair of cored bar segments 3 and 3 facing each other in the axial direction, and the cored bar segments 3 and 3 are combined into a skeleton inside the cage. It is formed to become. As shown in FIGS. 3 (A) and 3 (B), each cored bar 3 is a pressed product of a metal plate, is formed in the same shape as each other, and is disposed so as to face each other in opposite directions. ing. As the metal plate, for example, a cold rolled steel plate or the like is used. The surface roughness of each cored bar divided body 3 is set to 1S or more and 5S or less. Each cored bar 3 has a flat annular embedded part 3a and a plurality of pillar embedded parts 3b. Among these, the plurality of strut embedded portions 3b extend from the one annular embedded portion 3a to the facing annular embedded portion, that is, in the axial direction, and are arranged at regular intervals in the circumferential direction. The annular body embedded portion 3 a is embedded in the annular body 2 </ b> A in the resin portion 2, and each supporting column embedded portion 3 b is embedded in each supporting column body 2 </ b> B in the resin portion 2. Each strut embedded portion 3b is formed of a bent piece bent at the proximal end with respect to the annular embedded portion 3a.

The pillar embedded part 3b indicated by the one-dot chain line in FIG. 3A represents a state before being bent in the axial direction, and the pillar embedded part 3b indicated by the solid line in FIG. 3B is bent in the axial direction. Represents a state. The core metal is formed into a desired shape shown in FIG. 3 (B) by punching into the shape of FIG. 3 (A) with a press and then bending the embedded portions 3b in each pillar with the press. .
Each strut embedded portion 3b is narrower than the pillar width of each strut body 2B (FIG. 2), and is defined by a width dimension determined in the circumferential direction. However, the strut embedded portion 3b in this example is formed in a tapered shape in which the width dimension becomes narrower from the proximal end connected to the inner diameter side edge of the annular embedded portion 3a toward the opposite annular body. Yes.

As shown in FIG. 1, one side 3 ba of the pillar embedded portion 3 b is formed in parallel with the axial direction and the other side 3 bb is inclined so as to be inclined in the axial direction. A slanted piece 3bb in the pillar embedded part 3b connected to one annular body embedded part 3a and a slanted piece 3bb in the pillar embedded part 3b connected to the other annular body embedded part 3a have a predetermined gap in the circumferential direction. Are arranged adjacent to each other. In this manner, the plurality of support embedded portions 3b in the pair of core metal divided bodies 3 and 3 are combined from each other with the minute angle phase shifted from each other, and are defined from the intermediate portion to the tip portion of each support embedded portion 3b. It is arranged through a gap.
As shown in FIG. 3 (A), a plurality of (eight in this example) holes 4 for allowing the resin material to flow on the front and back sides are arranged at regular intervals in the circumferential direction in the annular embedded portion 3a of each cored bar 3. Is formed. Each hole 4 is, for example, a round hole having a diameter of 0.5 mm or more and 5.0 mm or less, and is formed in a radially intermediate portion of the annular body embedded portion 3a. However, each hole 4 is not limited to the diameter size.

  4A is a cross-sectional view taken along line IV (A) -IV (A) in FIG. 1, and FIG. 3B is a cross-sectional view taken along line IV (B) -IV (B) in FIG. As shown in FIGS. 4A and 4B, the cored bar 1 is formed to be a skeleton inside the cage by embedding the cored bar in the resin portion 2. The distance L1 between the outer surface of one annular body embedded part 3a and the outer surface of the annular body 2A covering this annular body embedded part 3a, the outer surface of the other annular body embedded part 3a, and this annular body embedded part 3a The distance L1 from the outer surface of the annular body 2A covering the same is defined to have the same dimension. As shown in FIG. 4B, the annular embedded part 3a and the support embedded part 3b are formed by bending the cored bar 1 into an L-shaped cross section.

  As shown in FIG. 5, a plurality of support points 6 that support the core metal 1 within the cavity of the mold 5 are equally arranged in the circumferential direction on the outer surface of the annular body embedded portion 3 a in the core metal divided body 3. Is provided. These support points 6 are provided at at least two circumferentially equidistant positions. Each support location 6 is a recessed portion formed on the outer side in the axial direction on the non-projecting side of the embedded in-support portion 3b in the annular embedded portion 3a. In this example, the recessed portion is formed of a non-through hole, and the support portion 7 of the annular body embedded portion 3a is fitted into the support protrusion 7 provided with the die by tight fitting, so that each core metal divided body 3 is made of gold. The mold 5 is positioned and supported. The resin portion 2 is provided with support location exposed portions 16 in which the support locations 6 are exposed at a plurality of locations in the circumferential direction corresponding to the support locations 6. In addition, the support location 6 provided in one annular body implantation part 3a and the support location 6 provided in the other annular body implantation part 3a are provided in the same number and in the same phase. A plurality of support points 6 may be provided at three or more circumferentially equidistant positions. It is also possible to provide a plurality of support points 6 non-equally. The recess may be a through hole.

  As shown in FIG. 6, the mold 5 has a fixed mold 8 and a movable mold 9 to be combined. The fixed mold 8 is fixed to the frame 10 or the like, and a pantograph-like moving mechanism 11 is attached to the movable mold 9. The cavity portion 12 of the movable mold 9 and the cavity portion 13 of the fixed mold 8 are arranged to face each other. A cavity 14 is formed in a state where these cavity portions 12 and 13 are combined. The movable mold 9 is configured to be movable with respect to the fixed mold 8 through the moving mechanism 11 in the mold opening state shown in FIG. 6 and the mold clamping state shown in FIG. In the mold open state of FIG. 6, as shown in FIG. 7, the support portion 6 of the one cored bar divided body 3 is fitted to the support protrusion 7 protruding into the cavity portion 13 of the fixed mold 8, thereby moving the movable mold. The support portion 6 of the other cored bar divided body 3 is fitted into the support protrusion 7 that protrudes into the cavity portion 12 of 9. Thereafter, the movable mold 9 is moved, and in the mold clamping state shown in FIG. 8, the cavity 14 is filled with a resin material and cured. At the time of molding by the mold 5, a pocket Pt of the rolling element is also formed. The fixed die 8 is provided with a gate (not shown) for filling the cavity 14 with a resin material. Note that the pocket Pt may be post-processed after the molded product is removed from the mold 5.

  According to the rolling bearing cage described above, since the core metal 1 is embedded in the resin portion 2, the strength of the entire cage is improved and the resin portion 2 is improved as compared with the configuration in which the core metal is provided on the surface of the resin portion. It is possible to improve the adhesion between the metal core 1 and the metal core 1. For this reason, when the bearing is used, for example, even if the coupling strength between one surface of the core metal 1 and the resin portion 2 is reduced due to a temperature rise or vibration of the cage, the other surface of the core metal 1 becomes the resin portion 2. Closely supported. Therefore, there is no possibility that the core metal 1 is undesirably peeled from the resin portion 2. Although the core metal 1 is embedded in the resin part 2, since the support part exposed part 16 is provided in the resin part 2, the core metal 1 can be stably supported in the cavity 14, and insert molding can be performed. Furthermore, the ratio of the resin material in the entire cage can be reduced as compared with the cage made of only the resin material. As a result, sink marks or the like which are peculiar to the resin can be reduced, and the dimensional accuracy can be increased. Moreover, since it is the structure which embeds the metal core 1 in the resin part 2, and provides the support location exposed part 16, it can respond to various cage shapes unlike what provides a metal core on the cage surface. Furthermore, since the entire cored bar is embedded in the resin portion 2 and the support points 6 of the cored bar 1 are provided equally in the circumferential direction, the center of gravity of the cage does not deviate from the intended position. The runout accuracy during rotation can be kept within a specified value. This makes it possible to extend the life of the cage as compared with the prior art.

The cored bar 1 is a pressed product of a metal plate, and the post embedded part 3b is a bent piece that is bent with respect to the annular embedded part 3 at the base end. It can be manufactured at a low cost by reducing the number of man-hours for processing. Since the pair of cored bar segments 3 and 3 are combined so as to face each other in the axial direction, the pair of cored bar segments 3 and 3 can be combined with each other in the same shape, thereby further reducing the manufacturing cost. be able to.
Since the column part 3b of the core metal 1 is formed to taper from the base end part connected to the inner diameter edge side of the annular body embedded part 3a toward the opposite annular body embedded part side, the pillar body embedded part 3b The rigidity of the base end portion of the core can be increased more than that of the tip end portion, and the strength of the entire core bar can be further increased.

  When the hole 4 through which the resin material flows is provided in the annular body embedded portion 3a of the core metal 1, when the cage is insert-molded by the mold 5, the resin material flows through the hole 4 of the annular body embedded portion 3a. To do. Thereby, the fluidity | liquidity of a resin material improves and it can prevent that malfunctions, such as a space | gap, generate | occur | produce in the resin part 2 beforehand. Therefore, it is possible to further reduce sink marks and the like on the surface of the resin portion and to improve the dimensional accuracy. By preventing the malfunction of the resin part 2, the yield can be improved and the productivity can be increased. In addition, since a part of the resin portion 2 enters the hole 4 of the annular body embedded portion 3a, the adhesion between the cored bar 1 and the resin portion 2 can be improved. Moreover, since the surface roughness of the cored bar 1 is set to 1S or more and 5S or less, it is possible to improve the bonding strength between the cored bar 1 and the resin portion 2 and to improve the adhesion between them.

Another embodiment will be described.
In the following description, the same reference numerals are given to the portions corresponding to the matters described in the preceding forms in each embodiment, and the overlapping description is omitted. When only a part of the configuration is described, the other parts of the configuration are the same as those described in the preceding section.
As shown in FIG. 8, a plurality of protrusions 15 that protrude in the axial direction may be provided on the inner surface of the annular embedded part 3 a of the cored bar 3 on which the pillar embedded part 3 b extends. Each protrusion 15 is formed in a conical shape that becomes thinner toward the tip side. In this case, the bond strength between the cored bar 1 and the resin part 2 can be further improved, and the adhesion between them can be improved.

As shown in FIG. 9, the cage may be applied to a crown-shaped ball bearing cage. This crown-shaped cage has a single cored bar 1 instead of a pair of cored metal divisions, and a resin part 2 that covers the entire cored bar except for the support portion 6 (FIG. 4) in the cavity. Further, in the cage of this example, a pocket Pt for holding the rolling elements is formed at the time of molding with a mold.
As shown in FIG. 10, the cage may be applied to a comb-shaped roller bearing cage. This comb-shaped roller bearing retainer also has a single core metal 1 and a resin portion 2 that covers the entire core metal except for the support portion 6 in the cavity, and a pocket for holding the rolling element when molding with a mold. Pt is formed.
According to these cages, since the entire core metal is covered with the resin portion 2 except for the support portion 6, the ratio of the resin material in the entire cage can be reduced as compared with the cage made of only the resin material. As a result, sink marks and the like can be reduced, and dimensional accuracy can be increased. Further, by covering the entire cored bar with the resin part 2, it is possible to improve the strength deficiency and improve the adhesion between the resin part 2 and the cored bar 1.
In each embodiment, the support location 6 is a recess, and the recess is fitted to the support projection 7 of the mold. Instead of this configuration, the support location 6 is a projection protruding outward in the axial direction. The convex portion may be fitted into the concave portion in the cavity of the mold.

DESCRIPTION OF SYMBOLS 1 ... Core metal 2 ... Resin part 2A ... Ring body 2B ... Support body 3 ... Core metal division | segmentation body 3a ... Ring body embedded part 3b ... Strut body embedded part 5 ... Mold 7 ... Supporting protrusion 8 ... Fixed mold 9 ... Movable Mold 14 ... Cavity 16 ... Supported part exposed part

Claims (13)

In a rolling bearing cage formed by insert molding a resin material with a core metal in a mold,
The core part is embedded in the resin part made of the resin material, and support part exposure parts are provided at a plurality of places in which the support part to be supported in the mold cavity of the core metal is exposed in the resin part. A cage for rolling bearings.   In Claim 1, the resin part has an annular body and a plurality of support pillars extending in the axial direction from the annular body to form a pocket for holding a rolling element between the annular body, A rolling bearing retainer provided with an annular body embedded portion embedded in the annular body of the resin portion and a plurality of support body embedded portions extending from the annular body embedded portion and embedded in the support columns.   The rolling bearing retainer according to claim 2, wherein the cored bar is a pressed product of a metal plate.   4. The rolling bearing retainer according to claim 2 or 3, wherein each of the support body embedded portions is a bent piece which is bent with respect to the annular embedded portion at the base end.   5. The support portion of the metal core according to claim 2, wherein the support portion of the core metal is a recessed portion formed in an axially outer side surface of the annular embedded portion on the non-projecting side of the strut embedded portion. Roller bearing cage.   In any one of Claims 2 thru / or 5, The above-mentioned maintenance machine is a pair of annular bodies which mutually opposed at intervals in the direction of an axis, and a plurality of pillars connected over these annular bodies, Roller bearing cage formed in a ladder shape.   6. The retainer according to claim 2, wherein the cage includes one annular body and a circular pocket that extends in an axial direction from one side surface of the annular body and holds a ball therebetween. A cage for a rolling bearing formed in a crown shape with a plurality of support columns forming the same.   6. The holder according to claim 2, wherein the retainer forms one annular body and a pocket that extends in an axial direction from one side surface of the annular body and holds the rollers therebetween. A rolling bearing cage formed in a comb shape with a plurality of support bodies.   7. The cored bar according to claim 6, wherein the cored bar is a combination of a pair of cored bar parts facing each other in the axial direction, and each cored bar divided body includes an annular body embedded part and an annular body embedded part, respectively. A cage for a rolling bearing having an embedded portion in the column extending in the axial direction from the bearing.   The rolling bearing retainer according to claim 9, wherein the cored bar is configured so that the pair of cored bar divided bodies have the same shape and face each other in opposite directions.   11. The mold according to claim 1, wherein the mold includes a fixed mold and a movable mold that is movable with respect to the fixed mold over a mold opening state and a mold clamping state. A rolling bearing cage in which one or both of a mold and a movable mold are provided with a support protrusion that protrudes into a cavity and supports a support portion of the core metal.   A rolling bearing using the cage according to any one of claims 1 to 11. In the manufacturing method of a rolling bearing cage formed by insert molding a resin material with a core with a die,
The mold has support protrusions that protrude from the cavity and support the core metal in at least two places in the circumferential direction. The support protrusions are filled with a resin material and cured in the cavity. Manufacture of a rolling bearing retainer in which the entire core metal except the support part of the core metal supported by the resin part is embedded in the resin part, and the support part exposed part in which the support part is exposed is formed into the shape of the resin part. Method.

Images