JP2019065919A - Retainer - Google Patents

Abstract

To suppress cost for manufacturing a resin comb-shaped retainer that can be used for a double-row roller bearing and reduce deformation at injection molding.SOLUTION: A retainer 10 includes: a single annular part 11; multiple pillar parts 12 extending from one side face of the annular part 11 to one side in an axial direction; and multiple pillar parts 12 extending from the other side face of the annular part 11 to the other side in the axial direction. Those pillar parts on both sides may be arranged in the same phase in a circumferential direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a resin cage used for a roller bearing, and more particularly to a multi-row roller bearing having double-row rollers, such as a self-aligning roller bearing.

  A so-called "comb type cage" is known as a cage used for double row roller bearings. The comb cage is composed of a single annular portion and a plurality of pillars extending from the side surface of the annular portion.

  In the case of a cage having a single annular portion, the annular portion and each column portion are held by an injection molding method in which a molten resin is injected into a cavity of a mold using a mold divided into two in the axial direction It is possible to manufacture the entire vessel in one piece.

  The conventional comb-shaped cage has a plurality of pillars only on one side in the axial direction with respect to the annular portion, and is asymmetric with respect to the opening and closing direction (axial direction) of the mold, resulting in uneven molding shrinkage. . In order to suppress the cage deformation due to the non-uniformity, it has been proposed that the comb-shaped cage be molded with a mold in anticipation of molding shrinkage and to have an appropriate cage shape after molding shrinkage (Patent Document 1).

Patent No. 4537920 gazette

  However, the deformation suppression method disclosed in Patent Document 1 requires high-level mold design that repeatedly performs trial manufacture and numerical analysis to find out how the molding shrinkage appears, which may be disadvantageous in cost.

  In view of the above-described background, the problem to be solved by the present invention is to suppress the manufacturing cost of a resin-made comb cage that can be used for a double row roller bearing and to reduce the deformation during injection molding .

  In order to achieve the above object, the present invention provides a single annular portion, a plurality of pillar portions extending from one side surface of the annular portion to one side in the axial direction, and an axial direction from the other side surface of the annular portion. A plurality of pillars extending to the other side, and between the pillars adjacent in the circumferential direction is a pocket capable of accommodating a roller, and the pillar contacts the rolling surface of the roller In a cage having a possible opposing surface, the annular portion, the plurality of pillars on the one side, and the plurality of pillars on the other side being integrally formed of resin. is there.

  According to the above configuration, since the plurality of pillars extend in the axial direction from both sides in the axial direction of the annular portion, the volume across the annular portion is made equal and the asymmetry of the cage in the axial direction is alleviated. it can. Thus, during injection molding in which the entire cage is integrally formed of resin, deformation of the cage due to molding shrinkage is suppressed, so deformation of the cage can be reduced. Moreover, since the above-mentioned deformation | transformation suppression is aimed at only by arrange | positioning a some pillar part on the both sides of a torus, it is possible to avoid a high-level metal mold design and to hold down manufacturing cost. In addition, since two rows of pockets are formed in the cage, it is also possible to accommodate double rows of rollers. Thus, according to the above configuration, it is possible to suppress the manufacturing cost of the resin-made comb-type cage that can be used for the double row roller bearing, and to reduce the deformation due to the injection molding.

  It is preferable that the plurality of pillars on one side and the plurality of pillars on the other side are arranged in the same phase in the circumferential direction. In this way, the shape of the cage that straddles the annular portion can be made symmetrical with respect to the axial direction, whereby deformation of the cage during injection molding can be further suppressed.

  Moreover, when the said opposing surface of the said pillar part has an undercut part, it is preferable that the said pillar part has a non-undercut part recessed so that space may be formed in the circumferential direction back side of the said undercut part. Here, the undercut portion corresponds to a surface portion that is caught in the mold opening direction (axial direction) when removing the holder from the mold, and the non-undercut portion is not caught in the mold opening direction. It corresponds to the surface part. By doing this, it is possible to make the thickness of the undercut portion of the opposing surface of the column portion thin and to be flexible, thereby facilitating the forced removal of the mold at the time of mold opening, and at the time of injection molding Deformation of the cage can be suppressed.

  In the case of a cage for a self-aligning roller bearing, the roller made of convex rollers can be accommodated in the pocket, and the opposing surface of the column portion follows the rolling surface of the roller. And a receding surface portion having a shape gradually moving away from the rolling surface of the roller in the axial direction toward the tip end side of the column portion, the concave portion being the column portion Extending to the outer diameter side and the inner diameter side of the column portion at the proximal end side and extending to the inner diameter side of the column portion at the tip end side of the column portion, and the receding surface portion is the outer diameter surface of the column portion It is preferable that the concave portion and the tip end portion of the column portion be continuous. In a self-aligning roller bearing, the opposing surface should be shaped along the rolling surface of the convex roller as much as possible in order to stabilize the behavior of the convex roller and cage during operation and to improve the function of reducing the acoustic and vibration of the bearing. It is preferable to On the other hand, in order to suppress cage deformation at the time of injection molding, it is preferable not to form an undercut portion on the opposing surface as much as possible. If the concave portion shaped along the rolling surface of the roller extends to the outer diameter side and the inner diameter side of the column at the base end of the column, and extends to the inner diameter side of the column at the tip of the column, The aforementioned functions can be well realized. On the other hand, the receding surface part which is shaped to move away from the rolling surface of the roller gradually in the axial direction toward the tip side of the column part is continuous with the outer diameter surface of the column part, the concave part and the tip part of the column part In this case, the undercut shape can be alleviated or eliminated by the receding surface portion, and the deformation of the cage can be suppressed. That is, it is possible to achieve both the realization of the above-mentioned function and the suppression of the cage deformation.

  More specifically, it is preferable that the receding surface portion of the column portion be partially continuous with each of the outer diameter surface and the tip portion of the column portion. In this manner, in the boundary between the outer diameter surface and the opposing surface of the column portion and the boundary between the opposing surface and the tip portion of the column portion, a portion not far from the rolling surface of the roller is left, and rolling at the boundary Since it is possible to maintain the size of the minimum gap between the surfaces, the behavior of the roller and the cage during operation can be further stabilized.

  A groove-like space extending axially through the circumferential center of the column and having a depth in the radial direction from the outer diameter surface of the column is formed, and the circumferential direction on the inner diameter side of the column is formed. It is preferable that a circumferential distance between the facing surfaces on both sides is set in a range of 75% or more and 125% or less of a circumferential distance from the groove-like space on the outer diameter side of the column to the facing surface. . In this case, the influence of the molding shrinkage on the opposing surface does not greatly differ between the outer diameter side and the inner diameter side of the column, and deformation of the opposing surface can be further suppressed.

  According to the present invention, by adopting the above-described configuration, it is possible to suppress the manufacturing cost of a resin-made comb-type cage that can be used for double row roller bearings, and to reduce the deformation due to injection molding.

The perspective view which shows the external appearance of the holder | retainer which concerns on 1st embodiment of this invention Longitudinal front view showing a double row roller bearing provided with the cage of FIG. 1 Right side view of the cage in Figure 1 Front view of the cage of FIG. 1 Sectional view of the V-V line in FIG. 3 Sectional view of the VI-VI line in FIG. 4 Sectional view of the VII-VII line in FIG. 4 Enlarged view near the pocket in Figure 3 The perspective view which shows the external appearance of the holder | retainer which concerns on 2nd embodiment of this invention Right side view of the cage of FIG. 9 Front view of the cage of FIG. 9 Cross section of line XII-XII in FIG. 10 The perspective view which shows the external appearance of the holder | retainer which concerns on 3rd embodiment of this invention Right side view of the cage of FIG. 13 Front view of the cage of FIG. 13 Cross section of line XVI-XVI in FIG. Cross section of line XVII-XVII in FIG. The perspective view which shows the external appearance of the holder | retainer which concerns on 4th embodiment of this invention Right side view of the cage of FIG. 18 Front view of the cage of FIG. 18 Cross section of line XXI-XXI in FIG. Cross section of line XXII-XXII in FIG. Cross section of line XXIII-XXIII in FIG. 20 An enlarged view near the pocket in Figure 19 The enlarged view of the state which accommodated the roller in the pocket of FIG. 18

A first embodiment as an example of the present invention will be described based on FIGS. 1 to 8.
The cage 10 shown in FIG. 1 includes a single annular portion 11, a plurality of pillar portions 12 extending from one side surface of the annular portion 11 to one side in the axial direction, and the other side surface from the other side surface of the annular portion 11. A plurality of pillars 12 extending to the side form a comb shape.

  Here, the “axial direction” refers to the direction along the central axis (not shown) of the cage. Further, the direction perpendicular to the central axis of the cage is called "radial direction", and the circumferential direction around the central axis of the cage is called "circumferential direction". The horizontal direction in FIGS. 2 and 4 corresponds to the axial direction, and the vertical direction in FIGS. 2 and 4 corresponds to the radial direction.

  As shown in FIG.1, FIG.3, and FIG.4, the annular part 11 of the holder | retainer 10 consists of a holder | retainer part which follows the circumferential direction whole circumference. The column portion 12 is formed of a cage portion having a projecting amount in the axial direction from the annular portion 11. The shape of the annular portion can be changed as appropriate.

  The total number of the column portions 12 located on one side in the axial direction with respect to the annular portion 11 and the total number of the column portions 12 located on the other side in the axial direction with respect to the annular portion 11 are the same. The cage 10 has a shape having rotational symmetry corresponding to the number of column portions 12 in the circumferential direction.

  When the cage 10 is considered in half with the virtual radial plane passing through the axial center of the annular portion 11 as a border, a cage half located on one side in the axial direction and a cage half located on the other side in the axial direction And are set to the same volume.

  The annular portion 11 and all the column portions 12 are integrally formed of resin. The holder 10 is formed by an injection molding method. Incidentally, a mold used in the injection molding is a general mold which is composed of a female mold and a male mold which are divided into two parts in the axial direction, and opened and closed in the axial direction.

  Examples of the above-mentioned resin include those obtained by adding glass fibers and carbon fibers to PA (polyamide) 66 and 46, but PPS (polyphenylene sulfide) and PEEK (polyether ether ketone) can also be adopted.

  A pocket (space) 13 capable of accommodating the roller 20 is formed between the pillars 12 adjacent to each other in the circumferential direction. The pocket 13 is formed by the side surface portion 14 of the annular portion 11 and the opposing surface 15 of the pillar portions 12 adjacent in the circumferential direction.

  The opposing surface 15 of the column portion 12 is a surface portion of the column portion 12 that faces the rolling surface 21 of the roller 20 in the circumferential direction and is a surface portion that can contact the rolling surface 21. The pillar portion 12 has opposing surfaces 15 on both sides in the circumferential direction of the pillar portion 12 in a symmetrical arrangement in the circumferential direction.

  The cage 10 is for self-aligning roller bearings, as shown in FIG. The self-aligning roller bearing shown in FIG. 2 comprises an inner ring 30 having double rows of raceways 31, an outer ring 40 having a single spherical raceway 41, and double rows of rollers 20 rolling between the spherical raceways 41 and the raceways 31, 31. And a cage 10 for maintaining the circumferential spacing between the rollers 20 of each row.

  The roller 20 is a convex roller. The convex roller has a convex-shaped (also called barrel-shaped) rolling surface 21 and a roller end surface 22. The rolling surface 21 of the roller 20 can contact the spherical raceway 41 and the raceway 31 in a part of the direction of the roller center axis Cr.

  The self-aligning roller bearing is configured such that when the central axis (not shown) of the inner ring 30 is relatively inclined with respect to the central axis (not shown) of the outer ring 40 By rolling the rollers 20 in the row, alignment is achieved in which the inner ring 30 and the outer ring 40 are coaxially guided. Note that FIG. 2 shows a state in which the inner ring 30, the outer ring 40, and the cage 10 are coaxially arranged (a state in which the alignment angle is 0 °).

  As shown in FIGS. 1 and 2, the roller 20 housed in the pocket 13 rolls between the inner ring 30 and the outer ring 40 in a posture in which the roller center axis Cr is inclined to the center axis of the cage 10. Become.

  When assembling the self-aligning roller bearing, the cage 10 is disposed coaxially with the inner ring 30, and the two rows of pockets of the cage 10 face the radial direction of the inner ring 30. It will be assembled to accommodate from the outer diameter side.

  The opposing surface 15 of the column 12 shown in FIG. 1 has a shape that can prevent the roller 20 housed in the pocket 13 from falling off to the cage outer diameter side. This drop prevention function is required for the convenience of the above-mentioned assembly.

  Moreover, the opposing surface 15 of the pillar part 12 becomes a shape made to respond | correspond to the attitude | position of the roller 20 shown in FIG. The side surface portion 14 of the annular portion 11 of the cage 10 has a planar shape that faces the roller end surface 22 at the center axis Cr in the state of FIG. 2. During operation of the bearing, the cage 10 is radially guided by contact with the rolling surface of the opposing surface 15 of the column 12 and with the rolling surface of the annular part 11, and axially with the contact of the side surface 14 of the annular portion 11 with the end face 22. You will be guided. In order to stabilize the behavior of the roller 20 and the cage 10 and to improve the function of reducing the sound and vibration of the self-aligning roller bearing, the opposing surface 15 has a shape along the rolling surface 21 of the roller 20 with a wide area as much as possible. It is done.

  The opposing surface 15 is continuous from the proximal end to the distal end of the column 12 as shown in FIGS. 1 and 5. In addition, the base end part of the pillar part 12 consists of a part on the boundary with the annular part 11. The tip end portion of the column portion 12 is composed of a portion farthest from the annular portion 11 in the axial direction. The tip of the column 12 is flat in the radial direction.

  The base end portion of the opposing surface 15 of the column portion 12 has a corner R shape connected to the side surface portion 14 of the annular portion 11. As shown in FIG. 5 to FIG. 8, of the facing surface 15, a portion from the base end of the facing surface 15 to the tip end of the column 12 has a concave portion having a shape along the rolling surface 21 of the roller 20. It comprises an arc surface portion 15b along a virtual cylindrical surface along the axial direction. The concave surface portion 15 a and the arc surface portion 15 b are continuous to the entire area of the facing surface 15 in the radial direction.

  As shown in FIG. 1 and FIG. 2, when considering the shape of the opposing surface 15 based on the state that the roller 20 taking a regular posture in design is located at the center of the roller center axis Cr at the center of the pocket 13, 5. The concave portion 15a shown in FIG. 8 is a curved surface along the rolling surface 21 of the roller 20 on the cross section obtained by circumferentially cutting the concave portion 15a at any radial position (see FIG. 5). And it is a curved surface shape which meets the rolling surface 21 of the said roller 20 also on the cross section which cut | disconnected the concave part 15a in radial direction in arbitrary axial positions (refer FIG. 6, FIG. 7).

  In addition, the concave portion 15a continues to a position closer to the tip end of the column 12 than the maximum outer diameter of the rolling surface 21 of the roller 20 in the above-described reference state in the axial direction (FIGS. 1 and 5) reference). Of the concave portion 15a, it is a portion closer to the tip end portion of the column portion 12 than the largest outer diameter portion of the rolling surface 21 and including the roller center axis (peripheral center axis Cr of FIG. The part located in the outer-diameter side of the pillar part 12 rather than the conical surface drawn by 1 round in a direction corresponds to an undercut part (refer FIG. 6, FIG. 7).

  The arc surface portion 15b is continuous between the tip end portion of the column portion 12 and the concave portion 15a, but since it is a surface portion along the axial direction, it does not correspond to an undercut portion.

  As shown in FIGS. 1 and 6 to 8, the column portion 12 has a non-undercut portion 16 recessed to form a space on the back side in the circumferential direction of the undercut portion included in the concave portion 15 a.

  The non-undercut portion 16 forms a groove-like space extending in the axial direction along the entire length of the column 12. The groove-like space formed by the non-undercut portion 16 passes through the circumferential direction central portion of the column 12 and has a depth in the radial direction from the outer diameter surface 17 of the column 12. In addition, on any virtual radial plane intersecting the non-undercut portion 16, the groove-like space is V-shaped.

  The outer diameter surface 17 of the column 12 is a portion of the surface of the column 12 that is included in the outer periphery of the cage 10 and has a shape along the circumferential direction.

Here, (see L ₁ in FIG. 6) the circumferential distance between the circumferential sides of the opposing surface 15 in the inner diameter side of the pillar portion 12, a groove-like space in the outer diameter side of the pillar portion 12 (the non-undercut portion 16 ) it is set in the circumferential distance (a range of 75% or more 125% or less of the _L reference ₂₎ in FIG. 6 to the opposing surface 15 from. This range is satisfied on any virtual radial plane that intersects the column 12. The boundary between the inner diameter side and the outer diameter side of the column 12 is on an imaginary circumference that bisects the radial length of the column 12 on any virtual radial plane.

  In the end face of the cut portion in FIG. 6, the circumferential distance between the facing surfaces 15 is about 100% of the circumferential distance between the groove space (non-undercut portion 16) and the facing surface 15. Further, at the end face of the cut portion in FIG. 7, the circumferential distance between the facing surfaces 15 is about 80% of the circumferential distance between the groove space (non-undercut portion 16) and the facing surface 15. Further, on the tip end portion of the facing surface 15 (the boundary with the tip end surface of the column portion 12) shown in FIG. 8, the circumferential distance between the facing surface 15 is the grooved space (non-undercut portion 16) and the facing surface The length is 75% of the circumferential distance between the fifteen. Further, on the base end portion (the boundary with the annular portion 11) of the facing surface 15 shown in FIG. 8, the circumferential distance between the facing surfaces 15 is the groove-like space (non-undercut portion 16) and the facing surface 15 125% of the circumferential distance between them.

  The cage 10 shown in FIG. 1 is as described above, and has a cage shape in which a plurality of pillars 12 extend from both sides in the axial direction of the annular portion 11, so that the volumes straddling the annular portion 11 are made equal ( It is possible to reduce the asymmetry of the cage 10 in the axial direction by making the volume of the cage half on the one axial side equal to the volume of the cage half on the other axial side). Thus, during injection molding in which the entire cage 10 is integrally formed of resin, deformation of the cage 10 accompanying molding shrinkage is suppressed, so deformation of the cage 10 during injection molding can be reduced. Moreover, since the above-mentioned deformation | transformation suppression is aimed at only by arrange | positioning the several pillar part 12 on both sides of the annular ring part 11, it is possible to avoid the advanced metal mold design and to hold down the manufacturing cost of the holder | retainer 10. Moreover, since the two rows of pockets 13 are formed in the holder 10, it is also possible to accommodate double rows of rollers 20. Thus, the cage 10 can reduce the manufacturing cost of a resin-made comb cage that can be used for a double row roller bearing such as a self-aligning roller bearing, and can reduce deformation due to injection molding .

  Further, as shown in FIGS. 6 and 7, the cage 10 has the non-undercut portion 16 recessed so as to form a space on the back side in the circumferential direction of the undercut portion of the opposing surface 15 as shown in FIGS. The thickness of the undercut portion of the facing surface 15 in the column portion 12 can be reduced to provide flexibility. For this reason, at the time of mold opening, the undercut portion of the opposing surface 15 pressed by the mold is easily bent to the circumferential center side of the column portion 12, and the forced removal of the mold is facilitated. Thereby, the holder 10 can suppress the deformation of the holder 10 at the time of injection molding.

Further, as shown in FIG. 6 and FIG. 8, the cage 10 shown in FIG. 1 is a groove-like space in which the circumferential distance L ₁ between the facing surfaces 15 on the inner diameter side of the column 12 is the outer diameter side of the column 12. because it is set in the circumferential distance range of 75% to 125% or less of the L ₂ between the (non-undercut portion 16) and the counter surface 15, an abrupt change in wall thickness in the circumferential direction rear side of the facing surface 15 The deformation of the opposing surface 15 does not differ greatly between the outer diameter side and the inner diameter side of the column 12, and the deformation of the opposing surface 15 can be further suppressed.

  A second embodiment of the present invention will be described based on FIGS. In the following, only differences from the first embodiment will be described, and the same element name is used for the corresponding component, and in particular, the same reference numeral is continuously used for the same component.

  In the cage 50 shown in FIGS. 9 to 12, a plurality of column portions 12 extending from the annular portion 11 to one side in the axial direction and a plurality of columnar portions 12 extending to the other side in the axial direction from the annular portion 11 are circumferentially It differs from the first embodiment in that it is arranged in the same phase in the direction.

  The gate for injecting the resin (the position of the gate mark 51 is shown in FIG. 9) is disposed at the circumferentially central portion of the inner diameter surface of the annular portion 11 located between the column portions 12 in both rows. By arranging the gates at equal intervals in the circumferential direction at nine locations among the 18 locations between the corresponding pillars 12, the weld center at which the injected resin collides is the circumferential center of the pillar 12 where the gate is not disposed Is supposed to occur.

  In the case of the cage 50, the cage shape straddling the annular portion 11 is symmetrical with respect to the axial direction (that is, the cage half on one axial side and the cage half on the other axial side are axial It is possible to further suppress deformation of the holder 50 at the time of injection molding, which is symmetrical in the direction.

A third embodiment of the present invention will be described on the basis of FIGS.
The cage 60 shown in FIGS. 13 to 17 differs from the first embodiment in that the non-undercut portion 61 is formed larger in the circumferential direction and the radial direction than in the first embodiment.

The non-undercut portion 61 of the column portion 62 has a groove bottom surface 63 along the circumferential direction. The groove bottom surface 63 is closer to the radial center of the column portion 62 than the outer diameter surface 64 of the column portion 62. Circumferential length L ₃ of the non-undercut portion 61 is greater than twice the circumferential distance L ₂ between the facing surfaces 15 and the groove-shaped space (non-undercut portion 61) at the outer diameter side of the pillar portion 12 size It is set to. Therefore, the circumferential distance L ₁ between the facing surfaces 15 in the inner diameter side of the pillar portion 62, the circumferential distance between the groove-like space (non-undercut portion 61) and the counter surface 15 at the outer diameter side of the pillar portion 62 L obviously greater than _2, is set to more than double.

  As described above, since the cage 60 is formed with the relatively large non-undercut portion 61 in the circumferential direction and the radial direction, the thickness of the undercut portion of the opposing surface 15 of the column portion 12 is It can be thinner and more flexible than the embodiment. Therefore, the retainer 60 can further suppress deformation of the facing surface 15 at the time of injection molding.

A fourth embodiment of the present invention will be described on the basis of FIGS.
The cage 70 shown in FIGS. 18 to 20 differs from the first embodiment in that the shape of the facing surface 72 of the column 71 is changed.

  As shown in FIGS. 18 and 21, the opposing surface 72 of the column 71 has a concave portion 72 a having a shape along the rolling surface 21 of the roller 20 and an end face of the column 71 gradually in the axial direction. The roller 20 has a receding surface portion 72 b having a shape moving away from the rolling surface 21 of the roller 20 in the circumferential direction, and an arc surface portion 72 c along the axial direction. The periphery of the end of the column 71 is chamfered, and the end of the opposing surface 72 is continuous with the chamfer of the end of the column 71.

  The concave surface portion 72a of the opposing surface 72 extends to the outer diameter side and the inner diameter side of the column portion 71 at the base end side of the column portion 71, as shown in FIGS. Further, the concave portion 72 a extends to the inner diameter side of the column portion 71 at the tip end side of the column portion 71.

  As shown in FIGS. 18, 21 and 23, the receding surface portion 72b of the facing surface 72 recedes in the circumferential direction more than the concave portion 72a, and the outer diameter surface 17 of the column portion 71, the concave portion 72a and the column portion It is continuous with the tip of 71. The shape and formation range of the receding surface portion 72 b are set so as to remove the portion corresponding to the undercut portion of the first embodiment on the outer diameter side of the column portion 71. For this reason, the receding surface portion 72b has a substantially triangular shape connected to the concave portion 72a on a large oblique side.

  The receding surface 72b is partially continuous with the outer diameter surface 17 of the column 71, as shown in FIGS. 21 and 23-25. An outer diameter edge e1 serving as a boundary between the concave portion 72a and the outer diameter surface 17 of the column portion 71 is an edge portion continuous between the point p1 and the annular portion 11. An outer diameter edge e2 that is a boundary between the receding surface portion 72b and the outer diameter surface 17 of the column portion 71 is an edge portion continuous between the point p1 and the tip portion of the column portion 71. The minimum clearance between the outer diameter edge e1 of the concave portion 72a and the rolling surface 21 of the roller 20 is set to be the same as in the first embodiment. The gap between the outer diameter edge e2 and the rolling surface 21 of the recessed surface portion 72b and the rolling surface 21 is wider than the gap between the outer diameter edge e1 and the rolling surface 21 of the concave portion 72a and the rolling surface 21.

  Further, the receding surface portion 72 b is partially continuous with the tip end portion of the column portion 71. The front end edge e3 which is the boundary between the receding surface 72b and the front end of the column 71 is an edge portion continuous between the point p2 and the outer diameter surface 17 of the column 71. The tip end edge e4 which is the boundary between the arc surface portion 72c and the tip end portion of the column portion 71 is an edge portion continuous between the point p2 and the tip portion of the column portion 71. The minimum clearance between the tip end edge e4 of the arc surface portion 72c and the rolling surface 21 of the roller 20 is set to be the same as that in the first embodiment. The clearance between the leading edge e3 and the rolling surface 21 of the receding surface 72b and the rolling surface 21 is wider than the clearance between the leading edge e4 and the rolling surface 21 of the circular arc surface 72c.

  The arcuate surface portion 72c of the opposing surface 72 is continuous with the concave surface portion 72a of the opposing surface 72 at a position circumferentially opposed to the largest outer diameter portion of the rolling surface 21 of the roller 20. For this reason, also on the inner diameter side of the column portion 71, a portion corresponding to the undercut portion of the first embodiment is removed.

  As described above, the facing surface 72 has a shape in which the undercut portion is entirely removed from the facing surface of the first embodiment by adopting the receding surface portion 72b and enlarging the arc surface portion 72c. Therefore, at the time of injection molding of the retainer 70, the mold can be opened in the axial direction without forced removal. It is also possible to make the opposing surface non-undercut over the entire surface by expanding the receding surface portion 72b instead of the arc surface portion 72c, but the clearance between the roller 20 and the rolling surface 21 It is disadvantageous in that it can not be set equal to one embodiment.

  In the cage 70, as described above, the concave portion 72a shaped along the rolling surface 21 of the roller 20 extends to the outer diameter side and the inner diameter side of the column 71 at the base end of the column 71 and Since the tip end side is in a wide range extending to the inner diameter side of the column portion 71, the behavior of the convex roller and the cage during operation can be stabilized, and the function of reducing the sound and vibration of the bearing can be favorably realized. Further, in the cage 70, a receding surface portion 72b shaped so as to be circumferentially separated from the rolling surface 21 of the roller 20 gradually toward the tip end side of the column portion 71 in the axial direction is a concave surface with the outer diameter surface 17 of the column portion 71 Since the portion 72a and the tip end portion of the column portion 71 are continuous, the undercut shape of the facing surface 72 can be alleviated or eliminated by the receding surface portion 72b, and the cage deformation can be suppressed. That is, the holder 70 can achieve both the realization of the above-mentioned function and the suppression of the holder deformation.

  Further, the cage 70 does not move away from the rolling surface 21 of the roller 20 at the boundary between the outer diameter surface 17 and the opposing surface 72 of the column 71 and the boundary between the opposing surface 72 and the tip of the column 71 Since it is possible to keep the size of the minimum gap between the rolling surface 21 at the boundary and the outer diameter edge e1 which is a portion and the tip edge e4 equal to that of the first embodiment, As compared with the case where the undercut portion is removed, the behavior of the roller 20 and the cage 70 during operation can be further stabilized.

  It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. Accordingly, the scope of the present invention is shown by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

10, 50, 60, 70 Retainer 11 Ring portion 12, 62, 71 Column portion 13 Pocket 15, 72 Countering surface 15a, 72a Concave portion 16, 61 Non-undercut portion 17, 64 Outer diameter surface 20 Roller 21 Rolling Face 72b Setback face

Claims (6)

It has a single annular portion, a plurality of pillars extending axially from one side of the annular portion to one side in the axial direction, and a plurality of columnar portions extending from the other side of the annular portion to the other side in the axial direction ,
Between the pillars adjacent in the circumferential direction are pockets that can accommodate rollers,
The column portion has an opposing surface capable of contacting the rolling surface of the roller;
The holder | retainer in which the said annular part, the several pillar part of the said one side, and the several pillar part of the said other side are integrally formed by resin.   The holder according to claim 1, wherein the plurality of pillars on one side and the plurality of pillars on the other side are disposed in the same phase in a circumferential direction.   The said opposing surface of the said pillar part has an undercut part, The said pillar part has a non-undercut part dented so that space may be formed on the circumferential direction back side of the said undercut part. Retainer. The roller consisting of convex rollers can be accommodated in the pocket,
A concave portion having a shape along the rolling surface of the roller, and a shape in which the opposing surface of the pillar portion is gradually separated from the rolling surface of the roller in the axial direction toward the tip side of the columnar portion And the concave portion extends to the outer diameter side and the inner diameter side of the column portion on the base end side of the column portion, and on the inner diameter side of the column portion on the tip side of the column portion. The retainer according to claim 1, wherein the retainer extends, and the receding surface is continuous with the outer diameter surface of the column, the concave portion, and the tip of the column.   The cage according to claim 4, wherein the receding surface portion of the column portion is partially continuous with each of the outer diameter surface and the tip portion of the column portion.   A groove-like space extending axially through the circumferential center of the column and having a depth in the radial direction from the outer diameter surface of the column is formed, and the circumferential direction on the inner diameter side of the column is formed. The circumferential distance between the facing surfaces on both sides is set in the range of 75% to 125% of the circumferential distance from the groove-like space on the outer diameter side of the column to the facing surface. The holder | retainer of any one of to 5.

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