JP5531551B2 - Roller bearing cage, inner ring assembly, outer ring assembly and rolling bearing provided with the cage - Google Patents

Description

  The present invention relates to a rolling bearing cage capable of suitably supporting a high-speed rotating shaft such as a machine tool, and an inner ring assembly, an outer ring assembly, and a rolling bearing provided with the cage.

Patent Document 1 listed below discloses a rolling bearing used for supporting a main shaft of a machine tool. The spindle of this machine tool is supported by different rolling bearings on the tool side and the non-tool side. On the counter-tool side, in order to escape the thermal expansion of the spindle, a cylindrical roller bearing that can allow axial displacement of the spindle Is used.
The cylindrical roller bearing includes an inner ring having a raceway on the outer periphery, an outer ring having a raceway on the inner periphery, a plurality of cylindrical rollers arranged to roll between the raceways of the inner and outer rings, and the cylindrical roller in the circumferential direction. And a cage for holding at a predetermined interval.

  The cage used in the cylindrical roller bearing described in Patent Document 1 is made of synthetic resin, and as shown in FIG. 7A, a pair of axially-shaped annular portions 121 formed in an annular shape. And a plurality of column portions 122 provided in the circumferential direction between the pair of annular portions 121, and a pocket 123 for accommodating the cylindrical roller 113 between the pair of annular portions 121 and the column portions 122 adjacent in the circumferential direction. Is formed. Protruding portions 130 that protrude toward the pocket 123 side and radially outward are formed in a bifurcated shape at both circumferential ends of each column portion 122.

  When assembling a cylindrical roller bearing using such a cage 114, first, as an intermediate stage, the cage 114 is disposed on the outer peripheral side of the inner ring 112, and the cylindrical roller 113 is accommodated in the pocket 123 of the cage 114. Assemble the inner ring assembly. In the state of the inner ring assembly, the cylindrical rollers 113 in the pocket 123 are pressed by a pair of protrusions 130 disposed on both sides thereof so as not to fall out in the radial direction. And a cylindrical roller bearing is completed by fitting an outer ring | wheel with the outer peripheral part of this inner ring | wheel assembly.

JP 2004-316757 A

  In the technique described in Patent Document 1, when assembling the inner ring assembly, the cylindrical rollers 113 are pushed in between the pair of protrusions 130 formed on both sides in the circumferential direction of the pocket 123 from the outside in the radial direction to form the pair of protrusions 130. It is elastically deformed so as to spread outward in the circumferential direction as indicated by an arrow. At this time, the side surface on the front end side of the protrusion 130 is a tapered surface 130a as shown in FIG. 7B, so that the cylindrical roller 113 can be easily introduced into the pocket 123. Since the corner portion 130c exists between the side surface 130b and the side surface 130b, the cylindrical roller 113 comes into strong contact with the corner portion 130c, and there is a problem that the projection portion 130 is easily damaged.

  Further, when the spindle of the machine tool rotates at a high speed, the cylindrical roller 113 accommodated in the pocket 123 tries to bite between the pair of protrusions 130 on both sides, but is formed on the pocket 123 side of the protrusion 130. Since the corner portion 130e exists between the concave arcuate side surface 130d and the side surface 130b continuous to the outside in the radial direction, the cylindrical roller 113 is in strong contact with the corner portion 130e, and a projection is formed at the corner portion 130e. The portion 130 is damaged or remarkably generates heat, which hinders high-speed rotation.

  Therefore, according to the present invention, it is possible to smoothly insert a rolling element such as a cylindrical roller into the cage pocket so that the protrusion is not damaged, and to bite between the protrusions during rotation of the rolling bearing. There are provided a rolling bearing retainer, an inner ring assembly, an outer ring assembly, and a rolling bearing, which can improve the high-speed rotation performance of the rolling bearing by preventing the protrusions from being damaged or generating heat by the rolling element. The purpose is to provide.

The rolling bearing cage of the present invention (Claim 1) includes a plurality of annular portions formed in an annular shape and a plurality of spanned portions spaced between the pair of annular portions in the circumferential direction. A rolling bearing retainer comprising a column portion, and a pocket for accommodating a rolling element of a rolling bearing between a pair of annular portions and a column portion adjacent in the circumferential direction, and adjacent to each other with the pocket interposed therebetween Each of the pillars has a fork protruding from both sides in the circumferential direction of the outer peripheral surface of the pillar toward the pocket side and radially outward, and presses the rolling elements housed in the pocket from the radially outer side. A concave portion recessed inward in the radial direction is provided between the projecting portions that are integrally formed and project in a forked manner from the pillar portion, and the pocket is provided with the projecting portions provided on both sides in the circumferential direction on the outer side in the circumferential direction. By elastically deforming to the above from the radially outer side Are those elements are incorporated, on a side surface of the pillar portion and the projections facing the pocket, the guide surface for slidably guiding the rolling elements are formed, this guide surface, the outer peripheral surface of the rolling element A convex arc-shaped connection surface that is smoothly connected to the radially outer side of the arc surface on the side surface of the projection portion facing the pocket. And an introduction surface for introducing the rolling element into the pocket, which is smoothly connected to the outside in the radial direction of the connection surface and is inclined toward the anti-pocket side toward the tip of the protrusion, and the curvature of the connection surface A radius r and a diameter D of the rolling element have a relationship of 0.1 ≦ r / D ≦ 0.3, the center of the rolling element, the guide surface and the connection surface on both sides of the rolling element. Connection point (inflection point) P1 and wedge angle α , Is set to α = 120 ° ~140 °, the inclination angle beta of the inlet surface, characterized in that it is set to β = 2 ° ~30 °.

Further, the rolling bearing cage of the present invention (Claim 4) is provided between a pair of annular portions formed in an annular shape and a pair of annular portions spaced apart in the circumferential direction. A rolling bearing retainer including a plurality of column portions, and a pocket for accommodating a rolling element of the rolling bearing between the pair of annular portions and the column portions adjacent to each other in the circumferential direction. Each of the adjacent column portions protrudes in a bifurcated shape from both circumferential sides of the inner peripheral surface of the column portion toward the pocket side and radially inward, and presses the rolling elements housed in the pocket from the radially inner side. A protrusion is formed integrally, and a recess recessed radially outward is provided between the protrusion protruding in a bifurcated manner from the pillar, and the pocket includes the protrusion provided on both sides in the circumferential direction. By elastically deforming the outer circumferential direction, from the radial inner side Are those Kiten body is incorporated, the pillar portion and the side surface of the protrusion facing said pocket, said guide surface for slidably guiding the rolling elements are formed, this guide surface, the rolling element A convex arc shape formed in a concave arc shape corresponding to the outer peripheral surface of the convex portion, and a convex arc shape that is smoothly continuous radially inward of the arc surface on the side surface of the protrusion facing the pocket. A connection surface and an introduction surface for introducing the rolling element into the pocket are formed to smoothly connect to the radially inner side of the connection surface and incline toward the anti-pocket side toward the tip of the protrusion, and the connection The radius of curvature r of the surface and the diameter D of the rolling element have a relationship of 0.1 ≦ r / D ≦ 0.3, the center of the rolling element, and the guide surfaces on both sides of the rolling element Connection point (inflection point) P1 with the connection surface Beauty angle alpha is set to α = 120 ° ~140 °, the inclination angle beta of the inlet surface, characterized in that it is set to β = 2 ° ~30 °.

  In each of the above configurations, the phrase “... smoothly connected” means that two adjacent surfaces are connected without forming a corner, that is, the two surfaces are differentiable at the connection point. To do.

  According to each configuration described above, the connecting surface that is smoothly connected to the arc surface of the guide surface is formed on the side surface on the pocket side of the projecting portion, and there is no corner between the two, so that the high-speed rotation is performed. When the rolling element tries to bite between the protrusions, it is possible to prevent the rolling element from coming into strong contact with a part of the side surface of the protrusion and damaging the protrusion or increasing heat generation. it can. Thereby, the high-speed rotation performance of a rolling bearing can be improved. In addition, the side surface on the pocket side of the projecting portion is formed with an introduction surface that is smoothly connected to the connection surface, and there is no corner between the two, so that it is introduced when assembling the inner ring assembly or the outer ring assembly. When the rolling elements are pushed in between the protrusions via the surface, it is easy to widen the interval between the protrusions, and the rolling elements come into strong contact with part of the side surfaces of the protrusions and damage the protrusions. Can be prevented.

  An inner ring assembly according to the present invention (Claim 2) has a raceway on an outer peripheral surface, an inner race having a flange protruding radially outwardly on at least one axial side of the raceway, and a diameter of the inner race. The retainer according to claim 1, which is disposed on the outer side in the direction, and a plurality of rolling elements housed in a pocket of the retainer and disposed so as to be able to roll on a track of the inner ring. It is characterized by that.

  An outer ring assembly according to the present invention (Claim 5) has a raceway on the inner peripheral surface, and an outer race having a flange projecting radially inward on at least one axial side of the raceway; The cage according to claim 4, which is arranged on the radially inner side of the outer ring, and a plurality of rolling elements which are accommodated in a pocket of the cage and arranged to roll on the raceway of the outer ring, It is characterized by having.

  Further, the rolling bearing of the present invention (Claim 3) has an outer ring having a raceway on the inner peripheral surface, a raceway on the outer peripheral surface, and a flange portion protruding radially outward on at least one axial side of the raceway. The cage according to claim 1, which is disposed between the inner ring and the radial direction between the outer ring and the inner ring, and the track of the outer ring and the inner ring which is accommodated in a pocket of the cage. And a plurality of rolling elements arranged on the top so as to be capable of rolling.

  The rolling bearing according to the present invention (Claim 6) includes an inner ring having a raceway on the outer peripheral surface, and a flange portion having a raceway on the inner peripheral surface and projecting radially inward at least on one axial side of the raceway. And a cage according to claim 4 disposed between the outer ring and the inner ring in a radial direction, and a track of the outer ring and the inner ring that is accommodated in a pocket of the cage. And a plurality of rolling elements arranged on the top so as to be capable of rolling.

  According to the above inner ring assembly, outer ring assembly, and rolling bearing, the same effects as the above-described cage can be obtained.

  According to the present invention, the rolling element can be smoothly inserted into the cage pocket so that the protrusion is not damaged, and, while the rolling bearing is rotating, the rolling element tries to bite between the protrusions. It is possible to improve the high-speed rotation performance of the rolling bearing by suppressing damage to the protrusions and increase in heat generation.

It is sectional drawing of the rolling bearing which concerns on embodiment of this invention. It is the top view which looked at the holder | retainer from the outer peripheral side. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is IV-IV sectional drawing of FIG. It is the V section enlarged detail drawing of FIG. It is explanatory drawing which expands and shows the structure around a connection surface. It is sectional drawing of the cage for rolling bearings based on a prior art.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a rolling bearing 10 according to an embodiment of the present invention. The rolling bearing 10 includes an annular outer ring 11, an inner ring 12 concentrically disposed on the inner peripheral side of the outer ring 11, and a plurality of cylindrical rollers 13 as rolling elements disposed between the outer ring 11 and the inner ring 12. And a retainer 14 for retaining the cylindrical rollers 13 at predetermined intervals in the circumferential direction.

The outer ring 11 is a member formed in an annular shape using alloy steel such as bearing steel, and an outer ring raceway 16 on which the cylindrical roller 13 rolls is formed along the circumferential direction on the inner periphery thereof.
The inner ring 12 is also a member formed in an annular shape using alloy steel such as bearing steel, and the inner ring raceway on which the cylindrical roller 13 rolls faces the outer ring raceway 16 in a state where the inner ring raceway faces the outer ring raceway 16. Is formed. Further, on the outer periphery of the inner ring 12, an inner ring collar portion 18 that protrudes radially outward is formed on both axial sides of the inner ring raceway 17, and the axial movement of the cylindrical roller 13 relative to the inner ring 12 is caused by the inner ring collar portion 18. It is regulated.

The outer ring 11 is not formed with a flange portion, and the axial movement of the cylindrical roller 13 on the outer ring raceway 16 is allowed.
The plurality of cylindrical rollers 13 can roll on the outer ring raceway 16 and the inner ring raceway 17, whereby the outer ring 11 and the inner ring 12 are relatively rotatable.

  2 is a plan view of the cage 14 as viewed from the outer periphery side, FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2, FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. FIG. The cage 14 is formed using a synthetic resin such as a polyether ether ketone (PEEK) resin reinforced with carbon fiber or the like. The cage 14 includes a pair of annular portions 21 formed in an annular shape in the annular direction and a plurality of column portions 22 extending in a circumferential direction between the pair of annular portions 21. The plurality of column portions 22 are arranged at a certain interval in the circumferential direction, and a substantially rectangular space formed between the column portions 22 adjacent to the circumferential direction and the pair of annular portions 21 is formed by the cylindrical rollers 13. The pocket 23 can be accommodated. The cage 14 is disposed between the outer ring 11 and the inner ring 12 so as to be substantially concentric with these two rings. The cage 14 may be formed using a polyamide resin.

  As shown in FIGS. 2 and 3, a bulging portion 25 that bulges into the pocket 23 is formed on the inner side surface in the axial direction (the side surface facing the pocket 23) of the pair of annular portions 21. The cylindrical roller 13 has its axial end surface in sliding contact with the tip end surface 25 a of the bulging portion 25, so that the axial position in the pocket 23 is regulated. Therefore, the front end surface 25a of the bulging portion 25 constitutes an axial guide surface that guides the cylindrical roller 13 so as to be slidable.

As shown in FIG. 4, a recess 26 that is recessed inward in the radial direction is formed in the center in the circumferential direction of the outer peripheral surface 36 of the column portion 22 over the entire axial direction of the column portion 22. In addition, a bulging portion 29 that bulges into the pocket 23 is formed at the central portion in the axial direction of the circumferential side surface 22 a (see FIG. 3) of the column portion 22. Further, on both sides in the circumferential direction of the outer peripheral surface 36 of the column part 22 and at the axially central part, protrusions 30 projecting toward the pocket 23 side and radially outward are formed.
A minimum interval W (see FIG. 4) between the pair of protrusions 30 disposed on both sides of the pocket 23 is formed to be smaller than the diameter D of the cylindrical roller 13. For example, the interval W is set to a dimension of about 88 to 95% with respect to the diameter D of the cylindrical roller 13.

  As shown in FIG. 5, the cylindrical roller 13 has its outer peripheral surface in sliding contact with the tip end surface of the bulging portion 29 and the side surface on the pocket side of the protruding portion 30, so that the circumferential position in the pocket 23 is regulated. Yes. Therefore, the front end surface of the bulging portion 29 and the side surface of the protruding portion 30 constitute a circumferential guide surface (guide surface of the present invention) that guides the cylindrical roller 13 so as to be slidable.

  The circumferential guide surface includes a first guide surface 28 and a second guide surface 32. The first guide surface 28 is formed as a flat surface substantially along the radial line L passing through the axial center of the cylindrical roller bearing 10. On the other hand, the second guide surface 32 is smoothly connected to the radially outer side of the first guide surface 28 (differentiably connected to the first guide surface 28), and is a concave circle corresponding to the outer peripheral surface of the cylindrical roller 13. The arc surface is formed in an arc shape. As shown in FIG. 4, the radius of curvature R of the second guide surface 32 is set to a value slightly larger than the radius (D / 2) of the cylindrical roller 13. For example, when the radius of the cylindrical roller 13 is 3 mm (diameter D is 6 mm), the radius of curvature R of the second guide surface 32 is set to about 3.1 mm.

  Further, as shown in FIG. 5, a connection surface 34 is formed on the side surface on the pocket 23 side of the protrusion 30 on the radially outer side of the second guide surface 32, and the connection surface 34 is formed on the second guide surface 32. Are formed in a convex arc shape so as to be smoothly connected (differentiably connected). Further, an introduction surface 35 is formed on the radially outer side of the connection surface 34, and the introduction surface 35 is formed substantially flat so as to be smoothly connected to the connection surface 34 (differentiably connected). Yes. Therefore, the connection surface 34 has a function of smoothly connecting the second guide surface 32 and the introduction surface 35 without forming a corner portion.

  The introduction surface 35 is an inclined surface inclined at an angle β on the opposite side of the pocket 23 with respect to the radial line L passing through the axial center of the cylindrical roller bearing 10. In FIG. 5, the connection point (inflection point) between the second guide surface 32 and the connection surface 34 is indicated by P1, and the connection point (inflection point) between the connection surface 34 and the introduction surface 35 is indicated by P2. .

  As shown in FIG. 4, the cylindrical roller 13 is held between the pair of protrusions 30 at an angle α (hereinafter referred to as “wedge angle”) formed by the center and the inflection points P <b> 1 on both sides. . When the value of the wedge angle α is small, the protrusion 30 surrounds the cylindrical roller 13 in a wide range, and the behavioral stability of the cylindrical roller 13 is enhanced, which is advantageous in rotating the cylindrical roller bearing 10 at a high speed. However, as will be described later, it is difficult to insert the cylindrical roller 13 between the pair of projecting portions 30, and there is a disadvantage that the assemblability is poor. On the other hand, when the value of the wedge angle α is large, the opposite result is obtained. In this embodiment, the value of the wedge angle α is set to about 120 ° to 140 °, thereby achieving a good balance between the high-speed rotation performance and the assemblability of the cylindrical roller bearing 10. The relationship between the wedge angle α and the curvature radius r of the connection surface 34 will be described later.

  The cylindrical roller bearing 10 of this embodiment is assembled as follows. First, in a state where the cage 14 is disposed on the outer peripheral side of the inner ring 12, the cylindrical roller 13 is inserted from the radially outer side between the pair of protrusions 30, and the cylindrical roller 13 is fitted into the pocket 23. As a result, an “inner ring assembly” as an intermediate stage of the cylindrical roller bearing 10 is assembled. And the cylindrical roller bearing 10 is completed by fitting the outer ring | wheel 11 to the outer peripheral part of this inner ring assembly.

When assembling the inner ring assembly as described above, the cylindrical roller 13 is interposed between the pair of projections 30 because the introduction surface 35 formed of an inclined surface is formed at the tip of the projection 30 as shown in FIG. When inserted, the interval W between the pair of protrusions 30 can be easily expanded outward in the circumferential direction (arrow X direction). Further, by forming the connecting surface 34 smoothly connected to the introduction surface 35, the contact pressure of the cylindrical roller 13 passing through the width W with respect to the protruding portion 30 is reduced, thereby preventing the protruding portion 30 from being damaged. ing. The inclination angle β of the introduction surface 35 is preferably 2 ° to 30 °.
Further, in the state of the inner ring assembly, the protrusion 30 of the retainer 14 prevents the cylindrical roller 13 from being detached from the pocket 23 radially outward.

  When the cylindrical roller 13 tries to bite between the pair of protrusions 30 due to the high-speed rotation of the cylindrical roller bearing 10, there is no corner between the second guide surface (arc surface) 32 and the connection surface 34. Since 32 and 34 are connected smoothly, it is possible to suppress the contact pressure of the cylindrical roller 13 with respect to the protrusion 30 from being partially increased to damage the protrusion 30 or increase the heat generation at the contact portion. Thus, the high-speed rotation performance of the cylindrical roller bearing 10 can be improved.

Next, the curvature radius r of the connection surface 34 formed between the second guide surface 32 and the introduction surface 35 will be described in detail.
FIG. 6 is an explanatory diagram showing an enlarged structure around the connection surface 34, and the curvature radius r of the connection surface 34 is set to have the following relationship with the diameter D of the cylindrical roller 13. .
0.1 ≦ r / D ≦ 0.3 (1)

  FIG. 6 also shows two connection surfaces 34a and 34b as a comparative example (see the two-dot chain line), and the curvature radius ra of one connection surface 34a is the curvature radius r of the connection surface 34 of this embodiment. The curvature radius rb of the other connection surface 34b is set to be larger than the curvature radius r of the connection surface 34 of the present embodiment.

  Assuming that the minimum distance W between the pair of protrusions 30 is constant, when the radius of curvature of the connection surface is small (when the connection surface is 34a), the connection point with the second guide surface 32 P1a is located on the radially outer side compared to the connection point P1 of the present embodiment. Conversely, when the radius of curvature of the connection surface is large (when the connection surface is 34b), the connection point P1b with the second guide surface 32 is radially inward compared to the connection point P1 of the present embodiment. To position.

  Therefore, in the former case, the wedge angle α (see FIG. 2) becomes smaller and the behavioral stability of the cylindrical roller 13 can be improved to improve the high-speed rotation performance of the cylindrical roller bearing 10, but the connection point P1a There is a drawback in that the contact pressure of the cylindrical roller 13 with respect to the protrusion 30 in the vicinity increases, and the protrusion 30 is easily damaged. In the latter case, since the wedge angle α is larger, the cylindrical roller 13 is likely to bite between the pair of protrusions 30 to increase resistance and easily generate heat, and in terms of high-speed rotation performance. Disadvantageous.

  In this regard, in the present embodiment, the curvature radius r of the connection surface 34 is set as in the above formula (1), thereby balancing the damage prevention of the protrusion 30 and the improvement in the high speed rotation performance of the cylindrical roller bearing 10. It is well planned.

  In the cylindrical roller bearing 10 according to the embodiment described above, the inner ring flange 18 is formed on the outer peripheral surface of the inner ring 12, and the protruding part 30 protruding radially outward is formed on the column part 22 of the cage 14. 12, the retainer 14, and the cylindrical roller 13 constitute an inner ring assembly. However, in the present invention, an outer ring collar portion is formed on the inner peripheral surface of the outer ring 11, and the pillar portion 22 of the retainer 14 is A protrusion 30 is formed which protrudes toward the pocket 23 and radially inward and prevents the cylindrical roller 13 from escaping radially inward from the pocket 23. The outer ring assembly, the retainer 14 and the cylindrical roller 13 form the outer ring assembly. It is applicable also to the cylindrical roller bearing 10 comprised by these. In any case, the flange that regulates the axial position of the cylindrical roller 13 may be formed only on one side of the inner ring 12 or the outer ring 11 in the axial direction, and the other is a separate flange. A ring may be provided.

  DESCRIPTION OF SYMBOLS 10: Rolling bearing, 11: Outer ring, 12: Inner ring, 13: Cylindrical roller (rolling element), 14: Cage, 16: Outer ring raceway, 17: Inner ring raceway, 18: Inner ring collar part, 21: Ring part, 22: Column part, 23: Pocket, 30: Projection part, 32: Second guide surface (arc surface), 34: Connection surface, 35: Introduction surface

Claims (6)

A pair of annular portions formed in an annular shape and a plurality of pillars laid between the pair of annular portions at a predetermined interval in the circumferential direction, and adjacent to the pair of annular portions in the circumferential direction A rolling bearing retainer having a pocket for accommodating a rolling element of the rolling bearing between the pillar portion and
Each of the column portions adjacent to each other with the pocket interposed therebetween protrudes in a bifurcated shape from both circumferential sides of the outer peripheral surface of the column portion toward the pocket side and radially outward, and the rolling elements housed in the pockets have a diameter. Protrusions that are pressed from the outside in the direction are integrally formed,
A recess that is recessed radially inward is provided between the protrusions protruding in a bifurcated manner from the column part,
The pocket is one in which the rolling elements are incorporated from the radially outer side by elastically deforming the protrusions provided on both sides in the circumferential direction outward in the circumferential direction.
A guide surface that guides the rolling element in a slidable contact manner is formed on the side surfaces of the pillar portion and the protrusion portion facing the pocket, and the guide surface has a concave arc shape corresponding to the outer peripheral surface of the rolling element. Including the formed arc surface,
Further, on the side surface of the projection facing the pocket, a convex arc-shaped connection surface smoothly connected to the radially outer side of the arc surface, and smoothly connected to the radially outer side of the connection surface and the tip of the projection And an introduction surface for introducing the rolling element into the pocket, which is inclined toward the anti-pocket side.
The radius of curvature r of the connecting surface and the diameter D of the rolling element are:
0.1 ≦ r / D ≦ 0.3
Have the relationship
The wedge angle α formed by the center of the rolling element and the connection point (inflection point) P1 between the guide surface and the connection surface on both sides of the rolling element is as follows:
α = 120 ° to 140 °
Set to
The inclination angle β of the introduction surface is
β = 2 ° -30 °
A cage for a rolling bearing, characterized by being set to. An inner ring having a track on the outer peripheral surface, and having a flange projecting radially outward on at least one axial side of the track;
The cage according to claim 1, which is disposed on the radially outer side of the inner ring,
A plurality of rolling elements housed in a pocket of the cage and arranged to roll on the race of the inner ring;
An inner ring assembly comprising: An outer ring having a track on the inner peripheral surface;
An inner ring having a track on the outer peripheral surface, and having a flange projecting radially outward on at least one axial side of the track;
The cage according to claim 1, which is disposed between the outer ring and the inner ring in a radial direction,
A plurality of rolling elements housed in a pocket of the cage and arranged to roll on the raceway of the outer ring and the inner ring;
A rolling bearing characterized by comprising: A pair of annular portions formed in an annular shape and a plurality of pillars laid between the pair of annular portions at a predetermined interval in the circumferential direction, and adjacent to the pair of annular portions in the circumferential direction A rolling bearing retainer having a pocket for accommodating a rolling element of the rolling bearing between the pillar portion and
Each of the column portions adjacent to each other with the pocket interposed therebetween is projected into a bifurcated shape from both sides in the circumferential direction of the inner peripheral surface of the column portion toward the pocket side and radially inward, and a rolling element housed in the pocket is provided. Protrusions that are pressed from the outside in the radial direction are integrally formed,
A recess that is recessed radially outward is provided between the protrusions protruding in a bifurcated manner from the column part,
The pocket is one in which the rolling elements are incorporated from the radially inner side by elastically deforming the protrusions provided on both sides in the circumferential direction outward in the circumferential direction.
A guide surface is formed on a side surface of the pillar portion and the projection portion facing the pocket so as to guide the rolling element in a slidable manner, and the guide surface has a concave arc shape corresponding to the outer peripheral surface of the rolling element. Including a circular arc surface formed in
Furthermore, on the side surface of the projection facing the pocket, there is a convex arc-shaped connection surface smoothly connected radially inward of the arc surface, and the tip of the protrusion is smoothly connected radially inward of the connection surface. And an introduction surface for introducing the rolling element into the pocket, which is inclined toward the anti-pocket side.
The radius of curvature r of the connecting surface and the diameter D of the rolling element are:
0.1 ≦ r / D ≦ 0.3
Have the relationship
The wedge angle α formed by the center of the rolling element and the connection point (inflection point) P1 between the guide surface and the connection surface on both sides of the rolling element is as follows:
α = 120 ° to 140 °
Set to
The inclination angle β of the introduction surface is
β = 2 ° -30 °
A cage for a rolling bearing, characterized by being set to. An outer ring having a track on the inner peripheral surface and having a flange projecting radially inward on at least one axial side of the track;
The cage according to claim 4, which is disposed on the radially inner side of the outer ring,
A plurality of rolling elements housed in a pocket of the cage and arranged to roll on the raceway of the outer ring;
An outer ring assembly comprising: An inner ring having a track on the outer peripheral surface;
An outer ring having a track on the inner peripheral surface and having a flange projecting radially inward on at least one axial side of the track;
The cage according to claim 4, which is disposed between the outer ring and the inner ring in a radial direction,
A plurality of rolling elements housed in a pocket of the retainer and arranged so as to be able to roll on the races of the outer ring and the inner ring;
A rolling bearing characterized by comprising:

Images