JP5218231B2 - 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 shaft that rotates at high speed, 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.

  Further, the cage used in the cylindrical roller bearing described in Patent Document 1 is made of synthetic resin, and as shown in FIG. 6, a pair of axially-shaped annular portions 121 formed in an annular shape and a pair of A plurality of column portions 122 extending between the annular portions 121 in the circumferential direction, and a pocket 123 for accommodating the cylindrical roller 113 is formed between the pair of annular portions 121 and the column portions 122 adjacent in the circumferential direction. Yes. 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 this state of the inner ring assembly, the cylindrical roller 113 in the pocket 123 is pressed by the protrusion 130 so as not to fall out radially outward. And a cylindrical roller bearing is assembled by fitting an outer ring | wheel to the outer peripheral part of this inner ring assembly.

JP 2004-316757 A

  In the technique described in Patent Document 1, when the spindle of the machine tool rotates at a high speed, the contact force between the retainer 114 of the cylindrical roller bearing and the cylindrical roller 113 also increases, so that the cylindrical rollers 113 accommodated in the pocket 123 are on both sides. Biting between the protrusions 130 increases the rotational resistance. Therefore, in order to prevent the cylindrical rollers 113 from biting between the protrusions 130 and cope with high-speed rotation of the main shaft, it is required to increase the rigidity of the protrusions 130.

  On the other hand, when assembling the inner ring assembly of the cylindrical roller bearing of Patent Document 1, the cylindrical roller 113 is pushed between the protruding portions 130 formed on both sides in the circumferential direction of the pocket 123 so that the protruding portion 130 is expanded outward in the circumferential direction. It must be elastically deformed. Therefore, when the rigidity of the protrusion 130 is too high, it is difficult to assemble the cylindrical roller 113, and local stress is generated at the base of the protrusion 130 (particularly, the boundary portion P between the outer peripheral surface 136 and the side surface of the column 122). There is a problem that it becomes easy to do.

  Accordingly, the present invention provides a rolling bearing retainer that can easily assemble cylindrical rollers and prevent the occurrence of local stress without significantly reducing the rigidity of the protrusion, and an inner ring provided with the retainer. An object is to provide an assembly, an outer ring assembly, and a rolling bearing.

  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 The column portion is formed with a protrusion that protrudes radially outward from the pocket and presses the rolling element housed in the pocket from the radially outer side, and is adjacent to the base of the protrusion in the axial direction. An inclined surface that is gradually inclined inward in the radial direction toward the pocket side is formed on the outer peripheral surface of the portion.

  The rolling bearing retainer of the present invention (Claim 5) 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. A protruding portion that protrudes toward the pocket side and radially inward and presses the rolling element accommodated in the pocket from the radially inner side is formed in the adjacent column portion, and is axially formed with respect to the base portion of the protruding portion. An inclined surface is formed on the inner peripheral surface of the adjacent column part so as to be gradually inclined outward in the radial direction toward the pocket side.

  According to each of the above configurations, since the inclined surface is formed on the outer peripheral surface or the inner peripheral surface of the pillar portion, when the protrusion portion is elastically deformed to accommodate the rolling element in the pocket, the protrusion portion Generation of local stress at the base can be prevented. Moreover, since only the inclined surface is formed on the outer peripheral surface or the inner peripheral surface of the column portion, the rigidity of the projection portion is slightly reduced, and it is possible to cope with high-speed rotation.

  It is preferable that the inclined surface is formed on an outer peripheral surface or an inner peripheral surface of the column portion adjacent to both sides in the axial direction with respect to the base portion of the protruding portion (Claims 2 and 6). Thereby, the local stress with respect to the base part of a projection part can be prevented more reliably.

  An inner ring assembly according to the present invention (Claim 3) has an inner ring having a raceway on the outer peripheral surface and a flange projecting radially outward on at least one axial side of the raceway, and a diameter of the inner ring. The cage according to claim 1 or 2, which is disposed on the outer side in the direction, and a plurality of rolling elements housed in a pocket of the cage and arranged to roll on a track of the inner ring. It is characterized by.

  An outer ring assembly according to the present invention (Claim 7) has a track on the inner peripheral surface, and an outer ring having a flange projecting radially inward on at least one axial side of the track; The cage according to claim 5 or 6, 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 a track of the outer ring. And.

  Further, the rolling bearing of the present invention (Claim 4) has an outer ring having a raceway on the inner peripheral surface, a raceway on the outer peripheral surface, and a flange portion projecting radially outward on at least one axial side of the raceway. The retainer according to claim 1 or 2, which is disposed between the inner ring and the outer ring and the inner ring in a radial direction, and is accommodated in a pocket of the retainer, and the outer ring and the inner ring And a plurality of rolling elements arranged so as to be able to roll on the track.

  Further, the rolling bearing of the present invention (Claim 8) has 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 on at least one axial side of the raceway. And a retainer according to claim 5 or 6, which is disposed between the outer ring and the inner ring in a radial direction, and is accommodated in a pocket of the retainer, and the outer ring and the inner ring. And a plurality of rolling elements arranged so as to be able to roll on the track.

  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, it is possible to facilitate the assembly of the cylindrical roller without significantly reducing the rigidity of the protrusion, and to prevent the generation of local stress at the base of the protrusion.

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 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 an inner ring raceway 17 on which the cylindrical roller 13 rolls is formed on the outer periphery thereof so as to face the outer ring raceway 16. . 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. 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 sectional view taken along line III-III in FIG. 2, and FIG. 4 is a sectional view taken along line IV-IV in FIG. The cage 14 is formed using a synthetic resin such as polyetheretherketone (PEEK) resin. 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. In addition, you may form the holder | retainer 14 using a polyamide resin.

An axial guide portion that bulges into the pocket 23 on the axially inner side surfaces (side surfaces facing the pocket 23) of the pair of annular portions 21, and whose front end surface is slidable in contact with the axial end surface of the cylindrical roller 13. 25 is formed. The axial direction guide portion 25 regulates the axial position of the cylindrical roller 13 in the pocket 23.
At the center in the circumferential direction of the outer peripheral surface of the column portion 22, a recess 26 that is recessed radially inward is formed over the entire axial direction of the column portion 22.

Further, in the circumferential side surface 22a of the column portion 22 and in the axial center portion, it bulges into the pocket 23, and its front end surface (first guide surface 28) can slide on the outer peripheral surface of the cylindrical roller 13. A circumferential guide 29 is formed. The first guide surface 28 is formed in a substantially flat surface and regulates the position of the cylindrical roller 13 in the circumferential direction of the cage.
Protrusions 30 projecting toward the pocket 23 side and radially outward are formed on both sides in the circumferential direction of the outer peripheral surface of the column portion 22 and in the central portion in the axial direction. The distance W (see FIG. 4) between the tip portions of the projections 30 on both sides of the pocket 23 is formed smaller than the diameter of the cylindrical roller 13.

  FIG. 5 is an enlarged view of a portion V in FIG. A side surface of the protrusion 30 on the pocket 23 side is a second guide surface 32 that is smoothly connected to the first guide surface 28 of the circumferential guide portion 29 and is curved in a concave arc shape. The radius of curvature of the second guide surface 32 is set to be slightly larger than the radius of curvature of the outer peripheral surface of the cylindrical roller 13. When the outer peripheral surface of the cylindrical roller 13 comes into contact with the second guide surface 32, the cylindrical roller 13 is guided, and the cylindrical roller 13 is released from the pocket 23 to the outside in the radial direction when the cylindrical roller bearing 10 is assembled. Is prevented.

  That is, in the present embodiment, the cylindrical roller 13 is fitted into the pocket 23 while the protrusions 30 on both sides in the circumferential direction of the pocket 23 are expanded while the cage 14 is disposed on the outer peripheral side of the inner ring 12. Thus, an “inner ring assembly” as an intermediate stage is assembled, and the cylindrical roller bearing 10 is assembled by fitting the outer ring 11 to the outer peripheral portion of the inner ring assembly. The cylindrical roller 13 has a function of preventing the three-dimensional cylindrical roller 13 from being detached from the pocket 23 radially outward.

  On the side surface of the protrusion 30 on the pocket 23 side, an arc surface 34 that is curved in a convex arc shape so as to be smoothly continuous with the second guide surface 32 is formed on the radially outer side of the second guide surface 32. Has been. By forming such an arc surface 34, when assembling the inner ring assembly, the protrusions 30 on both sides of the pocket 23 can be easily expanded outward in the circumferential direction when the cylindrical roller 13 is pushed into the pocket 23 from the radially outer side. It has become.

  As shown in FIG. 5, the outer peripheral surface of the column portion 22 disposed on both sides in the axial direction of the projection portion 30, that is, the outer peripheral surface of the column portion 22 disposed between the concave portion 26 and the pocket 23 is The first outer peripheral surface 35 on the concave portion 26 side and the second outer peripheral surface 36 on the pocket 23 side are configured. The first outer peripheral surface 35 is formed as an arc surface having the same center of curvature as the outer peripheral surface of the retainer 14 (the outer peripheral surface of the annular portion 21) or a flat surface substantially parallel to the outer peripheral surface. On the other hand, the 2nd outer peripheral surface 36 is made into the inclined surface which inclines in radial direction as it goes to the pocket 23 side. The circumferential dimension ratio L1: L2 between the first outer peripheral surface 35 and the second outer peripheral surface 36 is about 1: 2.

  In FIG. 5, the outline of the conventional column 22 is shown as a two-point difference line (reference numeral 50) as a comparative example. An inclined surface like the second outer peripheral surface 36 is not formed on the outer peripheral surface of the conventional column portion 22, and the first outer peripheral surface 35 is extended to the pocket 23 side as it is. In this conventional case, when the cylindrical roller 13 is pushed into the pocket 23 from the outside in the radial direction and the protrusion 30 is elastically deformed outward in the circumferential direction (arrow X), the base of the protrusion 30, particularly the outer peripheral surface 50 and the column portion. A local stress is generated in the vicinity of the corner portion P with the side surface 22a of the 22 so that it is easily damaged.

  On the other hand, in the present embodiment, since the second outer peripheral surface 36 made of an inclined surface is formed on the column portion 22, the tip of the projection portion 30 on which a load on the outer side in the circumferential direction (arrow X) acts. The distance from the portion to the location where the stress is likely to occur (indicated by reference numerals P1 and P2) is increased, and the locations P1 and P2 where the stress is likely to be generated are dispersed at a plurality of locations, and the angles θ1, θ2 (the angle θ1 formed by the side surface 22a of the column 22 and the second outer peripheral surface 36, and the angle θ2 formed by the second outer peripheral surface 36 and the first outer peripheral surface 35) is an obtuse angle larger than 90 °. By these, when the protrusion 30 is elastically deformed, it is possible to disperse the stress generated in the vicinity of the base of the protrusion 30 and to prevent the generation of local stress.

  Further, the protrusion 30 itself has the same shape as the conventional one, and the difference in performance is slight although the rigidity is slightly reduced by forming the inclined surface 36, and the protrusion 30 due to the high-speed rotation of the cylindrical roller bearing 10. Even if the contact force between the cylindrical roller 13 and the cylindrical roller 13 increases, it is possible to maintain sufficient rigidity.

  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.

  A first outer peripheral surface 35 and a second outer peripheral surface 36 (inclined surface) are formed on the outer peripheral surface of the column portion 22, but the first outer peripheral surface 35 is omitted and the first outer peripheral surface 35 is omitted. The second outer peripheral surface 36 may be extended by a dimension L1 corresponding to. Further, the second outer peripheral surface 36 may be a flat inclined surface, or may be an inclined surface curved in a convex or concave arc shape. The second outer peripheral surface 36 may be formed only on one side of the protrusion 30 in the axial direction.

  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: Protrusion part, 32: 2nd guide surface, 36: 2nd outer peripheral surface (inclined surface)

Claims (8)

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
Protruding portions that protrude from the pocket side and radially outward and press the rolling elements accommodated in the pocket from the radially outer side are formed on the column portions adjacent to each other with the pocket interposed therebetween. A rolling bearing retainer characterized in that an inclined surface that is gradually inclined inward in the radial direction toward the pocket side is formed on an outer peripheral surface of the column portion adjacent in the axial direction.   The rolling bearing retainer according to claim 1, wherein the inclined surface is formed on an outer peripheral surface of the column portion adjacent to both sides in the axial direction with respect to a base portion of the protrusion portion. 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 or 2, which is disposed on a 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 or 2, 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
A protruding portion that protrudes toward the pocket side and radially inward from the adjacent column portion across the pocket and presses the rolling elements housed in the pocket from the radially inner side is formed at the base of the protruding portion. On the other hand, the rolling bearing retainer is characterized in that an inclined surface is formed on the inner peripheral surface of the column portion adjacent in the axial direction so as to be gradually inclined outward in the radial direction toward the pocket side.   The rolling bearing retainer according to claim 5, wherein the inclined surface is formed on an inner peripheral surface of the column portion adjacent to both sides in the axial direction with respect to a base portion of the protruding portion. 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 5 or 6, 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 5 or 6 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 races of the outer ring and the inner ring;
A rolling bearing characterized by comprising:

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