JP6197605B2 - Cage for radial needle bearing - Google Patents

Description

  The present invention relates to an improvement in a radial needle bearing retainer for constituting a radial needle bearing that rotatably supports gears constituting various mechanical devices such as an automobile transmission around a power transmission shaft.

  A radial needle bearing 1 as shown in FIGS. 11 to 12 is incorporated in a portion to which a large radial load is applied among the rotation support portions of various mechanical devices, as described in, for example, Patent Document 1. The radial needle bearing 1 includes a cylindrical outer ring raceway 3 provided on an inner peripheral surface of an outer diameter side member 2 such as a housing (or a gear or roller that rotates during use) that does not rotate during use, and a rotary shaft (or A plurality of needles 6 are provided so as to be able to roll while being held by a cage 7 between a cylindrical inner ring raceway 5 provided on an outer peripheral surface of an inner diameter side member 4 such as a shaft such as a support shaft). Become.

  Of these, the cage 7 is entirely made of a synthetic resin material in a cylindrical shape. Such a cage 7 includes a pair of rim portions 8 and 8 that are arranged concentrically with an interval in the axial direction, each having an annular shape, and spaced in the circumferential direction over the circumferential direction. And a plurality of column portions 9 and 9 each having both end portions connected to the both rim portions 8 and 8. Then, pockets 10 for holding the respective needles 6 so as to be able to roll, respectively, at portions surrounded by the four rim portions 8 and 8 and two column portions 9 and 9 adjacent to each other in the circumferential direction. 10 and so on. Such a retainer 7 has an outer ring raceway 3 which is an inner peripheral surface of the outer diameter side member 2 and the inner diameter side member in a state where the needles 6 are rotatably held in the pockets 10 and 10. 4 and the inner ring raceway 5 which is the outer peripheral surface of the outer peripheral surface 4, relative rotation with respect to the outer diameter side member 2 and the inner diameter side member 4 is freely provided. The cage 7 rotates with respect to the outer diameter side member 2 and the inner diameter side member 4 as the needles 6 revolve.

  The cage 7 as described above has required strength, rigidity, elasticity, oil resistance, such as polyamide resin (PA), polyphenylene sulfide resin (PPS), and polyacetal resin (POM), and has a low friction coefficient. A thermoplastic synthetic resin is fed into a cavity of a mold apparatus in a heated and melted state, and cooled and solidified in the cavity. The mold apparatus is composed of a combination of a plurality of molds that move far and away from each other, and heats the molds in the cavity formed between the inner surfaces of the molds with the molds closest to each other. The molten synthetic resin is fed. Then, after the synthetic resin is cooled and solidified, the molds are separated from each other to open the cavity, and the completed cage 7 is taken out from the cavity.

  In this way, as a method of integrally forming a synthetic resin cage by injection molding, conventionally, a radial draw molding using a mold apparatus combining a plurality of molds divided in the radial direction and two in the axial direction are divided. Axial draw molding using a mold apparatus in which a pair of molds are combined is known. Of these, according to the radial draw molding, it is easy to form the pockets 10 and 10, which respectively communicate the inner and outer peripheral surfaces of the cage 7. However, in the case of the radial draw molding, not only the structure of the mold apparatus is complicated and the required accuracy is high, but also it is difficult to shorten the time required to open and close the cavity of the mold apparatus. The manufacturing cost of the cage 7 increases because it is difficult to improve the production efficiency of the cage 7.

  On the other hand, according to the axial draw molding, since the structure of the mold apparatus is simpler than that of the radial draw molding as described above, the manufacturing cost can be kept low. The mold apparatus used for the axial draw molding includes an outer diameter side mold having an inner surface (inner peripheral surface) shape aligned with the outer peripheral surface of the cage 7 and the radially outer half of each pocket 10, 10. The inner peripheral surface shape of the cage 7 and the inner diameter side mold having an inner surface (outer peripheral surface) shape that matches the radially inner half of each of the pockets 10 and 10 are combined. Then, in a state where these outer diameter side and inner diameter side molds are closest to each other, a synthetic resin heated and melted is sent into the cavity formed between these two molds, After cooling and solidifying, the molds are separated from each other in the axial direction to open the cavity, and the completed cage 7 is taken out from the cavity.

  By the way, in the outer peripheral surface of one rim portion 8 of the pair of rim portions 8, 8, the portion in which the phase in the circumferential direction matches the pockets 10, 10 has a width in the circumferential direction. The outer diameter side concave portion is formed in the same manner as each of the pockets 10 and 10 and has a depth in the radial direction that is about ½ of the pockets 10 and 10. Each of these outer diameter side recesses is for allowing a columnar outer diameter side protruding piece provided to form each of the pockets 10 and 10 in the outer diameter side mold to pass in the axial direction. . Similarly, in the inner peripheral surface of the other rim portion 8 of the both rim portions 8, 8, a portion where the phase in the circumferential direction coincides with each of the pockets 10, 10 is formed on the inner diameter side mold. Among them, a recess on the inner diameter side is formed to allow the columnar inner diameter side protruding piece provided to form each of the pockets 10 and 10 to pass in the axial direction. That is, when the cage 7 is made by axial draw molding, the thickness in the radial direction of the rim portions 8 and 8 at the portion where the concave portions on the outer diameter side and the inner diameter side are formed is reduced. Compared with the case where 7 is made by radial draw molding, it is disadvantageous in terms of ensuring the strength and rigidity of both the rim portions 8, 8. When the diameter (outer diameter) of each needle 6 is large and the radial thickness of both the rim portions 8 and 8 can be sufficiently secured, it is difficult to cause a problem, but the diameter of each needle 6 is small, When the thicknesses in the radial direction of both rim portions 8 and 8 are thin, the above-described problem is likely to be remarkable.

  In order to ensure the strength and rigidity of both the rim portions 8, 8, the tip surfaces of the outer diameter side and inner diameter side protrusions are partially cylindrical surfaces (the inclination angle with respect to the central axis of the cage 7 is 0 degree). It is possible to do. However, in this case, both the outer diameter side and inner diameter side molds are required to have high shape accuracy, and the manufacturing cost of these both molds increases. If the shape accuracy of these two molds is not sufficient, when these two molds are displaced in the axial direction, these two molds interfere with each other (the tip surfaces of these two molds rub against each other strongly). In other words, when synthetic resin is injection-molded, burrs may occur between the tip surfaces of both molds.

  Patent Document 2 describes the structure of a synthetic needle radial needle bearing cage that can be integrally formed by axial draw molding. However, in order to ensure the strength and rigidity of a pair of rim portions. The structure is not described.

JP 2008-8333 A Japanese Patent Laid-Open No. 2-89814

  In view of the circumstances as described above, the present invention provides a radial needle bearing cage that can be manufactured integrally by axial draw molding in order to reduce the manufacturing cost. The invention was invented to realize a structure that can be ensured in a simple manner.

The radial needle bearing retainer of the present invention includes a pair of rim portions and a plurality of column portions, as in the case of a conventionally known radial needle bearing retainer made of synthetic resin.
Of these, the pair of rim portions are each annular and are provided concentrically with an interval in the axial direction.
Moreover, each said pillar part is provided in the circumferential direction at intervals in the state spanned between both said rim | limb parts.
The portions surrounded by the four circumferences by the rim portions and a pair of column portions adjacent in the circumferential direction are pockets for holding needles that are rolling elements.

In particular, in the radial needle bearing retainer according to the present invention, a portion of the outer peripheral surface of one rim portion of the rim portions has a circular phase in a portion where the phase in the circumferential direction coincides with each pocket. The outer peripheral surface side recessed part whose width | variety regarding the circumferential direction is the same as these each pocket is provided. On the bottom surface of each of the outer peripheral surface side recesses, an axially inner outer peripheral inclined surface portion and an axially outer outer peripheral inclined surface portion that are inclined in a direction in which the outer diameter decreases as going outward in the axial direction are adjacent to each other in the axial direction. Provided. The inclination angle of the outer circumferential inclined surface portion in the axial direction with respect to the central axis of the radial needle bearing retainer is set to 0 ° or more and smaller than the inclination angle of the outer peripheral inclined surface portion in the axial direction.
Further, in the inner peripheral surface of the other rim portion of the two rim portions, the width in the circumferential direction is the same as that of each pocket in the portion where the phase in the circumferential direction coincides with each pocket. The peripheral surface side recessed part is provided. On the bottom surface of each inner peripheral surface side concave portion, an axially inner inner inclined surface portion and an axially outer inner inclined surface portion that are inclined in a direction in which the inner diameter becomes larger toward the axially outer side are respectively related to the axial direction. They are provided adjacent to each other. The inclination angle of the axially outer peripheral inclined surface portion with respect to the central axis of the radial needle bearing retainer is set to 0 ° or more and smaller than the inclination angle of the axially inner inner peripheral inclined surface portion.

When the radial needle bearing retainer of the present invention as described above is implemented, preferably, as in the invention described in claim 2, between the outer peripheral surface side concave portions in the one rim portion. An outer side in the axial direction of the outer peripheral surface is on the same plane as the outer peripheral inclined surface portion in the axial direction. In addition, the axially outer portion of the inner peripheral surface between the inner peripheral surface side concave portions of the other rim portion is flush with the axially outer peripheral inclined surface portion. .
Alternatively, as in the invention described in claim 3, a direction in which the outer diameter increases toward the inner side in the axial direction between the outer peripheral surface side concave portions among the axial outer end surfaces of the one rim portion. An outer diameter side taper surface portion inclined to the surface is provided. In addition, an inner diameter side tapered surface portion inclined in a direction in which the inner diameter becomes smaller toward the inner side in the axial direction is provided between the inner peripheral surface side concave portions of the other outer rim portion in the axial direction.

According to the radial needle bearing retainer of the present invention configured as described above, in the radial needle bearing retainer that can be integrally formed by axial draw molding in order to reduce the manufacturing cost, a pair of rim portions Sufficient strength and rigidity can be secured.
That is, in the case of the present invention, the outer peripheral inclination in the axial direction of the bottom surface of the concave portion on the outer peripheral surface side provided on the outer peripheral surface of one of the rim portions with respect to the central axis of the cage for the radial needle bearing. The inclination angle of the surface portion is made smaller than the inclination angle of the axially inner peripheral inclined surface portion. Similarly, the inclination angle of the axially outer inner peripheral inclined surface portion of the bottom surface of the inner peripheral surface side concave portion provided on the inner peripheral surface of the other rim portion is made smaller than the inclination angle of the axially inner inner peripheral inclined surface portion. ing. For this reason, it can prevent that the thickness regarding the radial direction of the axial direction outer side part of both said rim parts becomes small too much. As a result, the strength and rigidity of both the rim portions can be sufficiently secured.

The perspective view (A) which looked at the radial needle bearing retainer of the 1st example of the embodiment of the present invention from the radial direction outer side of one axial direction, and the radial direction outer side of the other axial end side A perspective view (B). FIG. 1A is an enlarged view (A) of FIG. 1 (A) and FIG. 1 (B) is an enlarged view (B) of a portion b. The end view (A) of the retainer for radial needle bearings seen from the arrow c direction of (A) of FIG. 1, and the upper enlarged view (B) of (A). Dd sectional drawing of FIG. The expanded ee sectional drawing of FIG. The figure similar to FIG. 1 which shows the 2nd example of embodiment of this invention. The f section enlarged view (A) of FIG. 6 (A) and the g section enlarged view (B) of FIG. 6 (B). The figure similar to FIG. 1 which shows the 3rd example of embodiment of this invention. The h part enlarged view (A) of (A) of FIG. 8 and the i part enlarged view (B) of (B) of FIG. The figure similar to FIG. 3 which shows the 3rd example of embodiment of this invention. The fragmentary sectional view which shows one example of the radial needle bearing incorporating the holder | retainer used as the object of this invention. The figure which looked at a part of retainer built in this radial needle bearing from the diameter direction.

[First example of embodiment]
FIGS. 1-5 has shown the 1st example of embodiment of this invention corresponding to Claims 1-2. The retainer 11 for the radial needle bearing of the present example includes a pair of rim portions 8a and 8b and a plurality of retainers 11 as well as a saddle-shaped retainer widely known for a radial needle bearing. It comprises a book column 9a, 9a. Of these, the pair of rim portions 8a and 8b are each in an annular shape, and are provided concentrically with an interval in the axial direction. The column portions 9a, 9a are provided in a circumferentially spaced state, and both axial end portions thereof are connected to the rim portions 8a, 8b, and the rim portions 8a, Portions 10a and 10a for holding the needle 6 (see FIG. 11) are formed by surrounding the four circumferences by 8b and two column portions 9a and 9a adjacent to each other in the circumferential direction.

  In the case of this example, the retainer 11 having such a configuration has a pair of molds (split molds) (not shown) close to each other in a cavity formed between the two molds, for example, After injection molding the same synthetic resin as a general synthetic resin retainer, such as thermoplastic synthetic resins such as PA, PPS, POM, or reinforced plastic mixed with reinforcing fibers such as glass fibers in these resins The two molds are made by so-called axial draw molding in which they are separated from each other in the axial direction.

For this purpose, among the outer peripheral surfaces of the rim portion 8a of one of the rim portions 8a, 8b {(A) in FIG. 1, left side in FIG. 4, right side in (B)}, Concave portions 12a and 12a, which are concave portions on the outer peripheral surface side recessed inward in the radial direction, are provided at portions where the phase in the circumferential direction coincides with the pockets 10a and 10a. The width dimensions of the recesses 12a and 12a in the circumferential direction are the same as the width dimensions of the pockets 10a and 10a in the circumferential direction. The axially inner outer peripheral inclined surface portions 13 and 13 are formed on the inner side in the axial direction of the bottom surfaces (outer peripheral surfaces) of the recesses 12a and 12a. Each is provided. Each of these axially inner and outer peripheral inclined surface portions 13 and 13 and axially outer and outer peripheral inclined surface portions 14 and 14 is a partial conical inclined surface inclined in a direction in which the outer diameter increases toward the inner side in the axial direction. The inclination angle of each of the outer circumferential inclined surface portions 14 and 14 in the axial direction with respect to the central axis of the cage 11 is also made smaller than the inclination angle of the outer circumferential inclined surface portions 13 and 13 in the axial direction. The positions of the intersections (intersection lines) between the axially inner and outer peripheral inclined surface portions 13 and 13 and the axially outer peripheral inclined surface portions 14 and 14 are extracted when the molds are separated from each other in the axial direction. As long as the gradient can be ensured, it is preferable to set the inner side in the axial direction from the viewpoint of securing the strength and rigidity of the one rim portion 8a. In addition, the inclination angle of each of the outer circumferential inclined surface portions 14 and 14 in the axial direction is set to 0 degrees from the surface that ensures the strength and rigidity of the one rim portion 8a (in parallel with the central axis of the cage 7). ) Is preferable. However, the inclination angles of the axially inner and outer peripheral inclined surface portions 13 and 13 and the axially outer peripheral and inclined surface portions 14 and 14 are determined by design so that the two molds can be relatively displaced relative to each other in the axial direction. .
In the case of this example, the axially outer portion of the rim outer peripheral surface 15a between the recesses 12a, 12a is positioned on the same partial conical surface as the axial outer peripheral inclined surface portions 14,14. Yes. With such a structure, the outer end surface in the axial direction of the portion near the outer diameter of the one rim portion 8a is positioned more inward in the axial direction than the outer end surface in the axial direction of the portion near the inner diameter of the one rim portion 8a. .

On the other hand, with respect to the rim portion 8b of the other of the rim portions 8a and 8b (the right side of FIG. 1A, the right side of FIG. 1, the left side of FIG. 1B), the one rim portion 8a is symmetrical with respect to the radial direction and the axial direction. That is, in the inner peripheral surface of the other rim portion 8b, concave portions 12b and 12b that are recessed radially outward are provided in portions where the phase in the circumferential direction coincides with the pockets 10a and 10a. The axially inner inner inclined surface portions 16 and 16 are formed on the axially inner portion of the bottom surfaces (inner peripheral surfaces) of the concave portions 12b and 12b, and the axially outer inner inclined surface portion 17 is formed on the axially outer portion. 17 are provided. Each of the inner and outer inclined concave surface portions 16 and 17 is a partial conical inclined surface that is inclined in a direction in which the inner diameter becomes smaller as it goes inward in the axial direction, and the respective axes with respect to the central axis of the cage 11. The inclination angle of the inner circumferential inclined surface portions 17, 17 in the direction outer side is also made smaller than the inclination angle of the inner inner inclined surface portions 16, 16 in the axial direction.
The axially outer portion of the rim inner peripheral surface 15b between the recesses 12b, 12b is positioned on the same partial conical surface as the axially outer peripheral inclined surface portions 17, 17. With such a structure, the axially outer end surface of the other rim portion 8b near the outer diameter is positioned axially inward from the axially outer end surface of the other rim portion 8b nearer the outer diameter. Yes.

  According to the radial needle bearing retainer of this example as described above, it can be integrally formed by axial draw molding, and the strength and rigidity of the pair of rim portions 8a and 8b can be sufficiently secured.

  That is, in the case of this example, the inclination angle of each axially outer peripheral inclined surface part 14, 14 with respect to the central axis of the cage 11 is made smaller than the inclination angle of each axially inner peripheral inclined surface part 13, 13. The inclination angle of each of the axially outer inner peripheral inclined surface portions 17 and 17 is made smaller than the inclination angle of each of the axially inner inner peripheral inclined surface portions 16 and 16. Accordingly, in order to manufacture the cage 11 by axial draw molding, the axially outer peripheral inclined surface portions 13 and 13 and the axially outer peripheral inclined surface portions 14 and 14 function as draft angles on the rim portions 8a and 8b. In addition, even when the axially inner inner inclined surface portions 16 and 16 and the axially outer inner inclined surface portions 17 and 17 are provided, the radial directions of the axially outer portions of the rim portions 8a and 8b are provided. It can prevent that the thickness regarding becomes too small. That is, in the case of this example, the thickness in the radial direction of the axially outer portion of the one rim portion 8a is set in the axially inward direction over the entire outer circumferential surface of the one rim portion 8a. Compared with the case where the inclined surface is inclined in the direction in which the outer diameter increases as it goes to, it can be increased (the cross-sectional area is widened) by the portion indicated by the matte surface in FIG. As a result, the strength and rigidity of both the rim portions 8a and 8b can be sufficiently secured, and vibration and noise generated during operation of the radial needle bearing 1 (see FIG. 11) incorporating the retainer 11 can be suppressed. Intersections between the axial inner peripheral inclined surface portions 13 and 13 and the axial outer peripheral inclined surface portions 14 and 14, and the axial inner peripheral inclined surface portions 16 and 16 and the axial outer peripheral inclined surface portions 17 and 17. The position of the intersection in the axial direction is determined by design in consideration of the strength and rigidity of the rim portions 8a and 8b. However, the intersections between the axially inner peripheral inclined surface portions 13 and 13 and the axially outer peripheral inclined surface portions 14 and 14, and the axially inner inner peripheral inclined surface portions 16 and 16 and the axially outer peripheral inclined surface portions 17 and 17. The axial position of the intersection of the two can ensure the strength and rigidity of both the rim portions 8a and 8b, and as far as possible in the axial direction within the range where the mold parts do not contact each other, the draft angle is ensured. In view of smoothing the axial displacement of both molds immediately after injection molding, it is desirable.

  In the case of this example, the axially outer portion of the rim outer peripheral surface 15a between the recesses 12a, 12a is positioned on the same partial conical surface as the axial outer peripheral inclined surface portions 14,14. Yes. Similarly, the rim inner peripheral surface 15b between the recesses 12b, 12b is positioned on the same partial conical surface as the axial outer inner inclined surface portions 17, 17. For this reason, it is possible to facilitate the die cutting of the axially outer peripheral inclined surface portions 14 and 14 and the axially outer peripheral inclined surface portions 17 and 17, and the radial needle bearing 1 incorporating the retainer 11 is in operation. Even when the central axis of the cage 11 is inclined with respect to the rotational center of the radial needle bearing 1, the axially outer end surface of the outer rim portion of the one rim portion 8a or the other rim portion 8b The axially outer end surface of the portion closer to the inner diameter interferes with a mating surface facing the axially outer end surface of both the rim portions 8a and 8b (between the concave portions 12a and 12a or between the concave portions 12b and 12b. It is possible to prevent the intermediate portion from being caught on the other side.

[Second Example of Embodiment]
6 to 7 show a second example of an embodiment of the present invention corresponding to claims 1 and 3. Similarly to the cage 11 of the first example of the embodiment described above, the cage 11a of the present example is also circumferential in the outer circumferential surface of one rim portion 8c of the pair of rim portions 8c and 8d. Concave portions 12c and 12c are provided in the portions where the phase of the line coincides with the pockets 10a and 10a. In the case of this example, of the axially outer end surface of the one rim portion 8c, the tapered surface portion that is inclined in the axially inward direction toward the radially outward direction at the portion between the recesses 12c, 12 18a and 18a.
On the other hand, recesses 12d and 12d are provided in portions of the inner peripheral surface of the other rim portion 8d of the rim portions 8c and 8d where the phase in the circumferential direction coincides with the pockets 10a and 10a. ing. And among the axial direction outer end surfaces of said other rim | limb part 8d, the taper surface part 18b and 18b which incline in the direction which goes to an axial direction inward, so that the part between these recessed parts 12d and 12d goes to radial direction inward. It is said.

According to the cage 11a of this example as described above, similarly to the cage 11 according to the first example of the embodiment, the axially outer peripheral inclined surface portions 14 and 14 (the axially outer peripheral inclined surface portions 17 and 17 are arranged. ) The part can be easily cut out. Even when the central axis of the retainer 11a is inclined with respect to the center of rotation of the radial needle bearing 1 during operation of the radial needle bearing 1 incorporating the retainer 11a (see FIG. 11), The axial outer end surface of the rim portion 8c near the outer diameter or the axial outer end surface of the other rim portion 8d near the inner diameter interferes with the opposing surface facing the axial outer end surfaces of the two rim portions 8c, 8d. (The portion between the recesses 12c and 12c or the portion between the recesses 12d and 12d is caught on the mating surface).
About the structure of another part, an effect | action, and an effect, it is the same as that of the case of the 1st example of embodiment mentioned above.

[Third example of embodiment]
8 to 10 show a third example of an embodiment of the present invention corresponding to claim 1. Similarly to the cage 11 of the first example of the above-described embodiment, the cage 11c of the present example is also circumferential in the outer circumferential surface of one rim portion 8e of the pair of rim portions 8e and 8f. Concave portions 12e and 12e are provided at portions where the phase of the second portion coincides with the pockets 10a and 10a. In the case of this example, of the axially outer end surface of the one rim portion 8e, the portion between the recesses 12e and 12e is the same as the axially outer end surface of the radially inward portion of the one rim portion 8e. It is located on a plane.
On the other hand, in the outer peripheral surface of the other rim portion 8f of the rim portions 8e and 8f, recesses 12f and 12f are provided in portions where the phase in the circumferential direction coincides with the pockets 10a and 10a. Of the outer end surface in the axial direction of the other rim portion 8f, the portion between the recesses 12f, 12f is positioned on the same plane as the outer end surface in the axial direction of the radially outer portion of the other rim portion 8f. ing.

In the case of the retainer 11c of this example as well, the strength and rigidity of both the rim portions 8e and 8f can be increased similarly to the retainer 11 according to the first example of the embodiment.
Other configurations, operations, and effects are the same as those in the first example of the above-described embodiment.

DESCRIPTION OF SYMBOLS 1 Radial needle bearing 2 Outer diameter side member 3 Outer ring raceway 4 Inner ring raceway 5 Inner ring raceway 6 Needle 7 Cage 8, 8a-8f Rim part 9, 9a Pillar part 10, 10a Pocket 11, 11a Cage 12a-12f Recessed part 13 Axial inner peripheral inclined surface portion 14 Axial outer peripheral inclined surface portion 15a Rim portion outer peripheral surface 15b Rim portion inner peripheral surface 16 Axial inner inner peripheral inclined surface portion 17 Axial outer peripheral inclined surface portions 18a, 18b Tapered surface portions

Claims (3)

A pair of annular rim portions provided concentrically with each other at an axial interval;
It consists of a plurality of pillars provided at intervals in the circumferential direction in a state of being spanned between these two rim parts,
In the radial needle bearing retainer, the portions surrounded by the four rims by the two rim portions and a pair of column portions adjacent in the circumferential direction are pockets for holding needles as rolling elements, respectively.
Outer peripheral surface side concave portion in which the phase in the circumferential direction coincides with each of the pockets on the outer peripheral surface of one of the rim portions, and the width in the circumferential direction is the same as each of the pockets. An axially inner peripheral inclined surface portion and an axially outer peripheral inclined surface portion that are inclined in a direction in which the outer diameter decreases toward the outer side in the axial direction are axially formed on the bottom surfaces of the respective concave portions on the outer peripheral surface side. In relation to the central axis of the radial needle bearing retainer, the inclination angle of the outer circumferential inclined surface portion in the axial direction with respect to the central axis is 0 degree or more, and the inclination angle of the outer circumferential inclined surface portion in the axial direction Smaller than
Of the inner peripheral surfaces of the other rim portion of the two rim portions, the inner peripheral surface having the same width in the circumferential direction as that of the respective pockets in a portion where the phase in the circumferential direction coincides with each of the pockets. Side recesses are provided, and on the bottom surfaces of the respective inner peripheral surface side recesses, an axial inner inner inclined surface portion and an axial outer inner inclined surface portion that are inclined in a direction in which the inner diameter increases as going outward in the axial direction, Are provided adjacent to each other with respect to the axial direction, the inclination angle of the axially outer peripheral inclined surface portion with respect to the central axis of the radial needle bearing retainer is 0 degree or more, and the axially inner side A radial needle bearing retainer characterized in that it is smaller than the inclination angle of the circumferential inclined surface portion. Of the outer peripheral surfaces between the respective outer peripheral surface side recesses in the one rim portion, the outer side in the axial direction is on the same plane as the outer peripheral inclined surface portion in the axial direction,
The axially outer portion of the inner peripheral surfaces between the inner peripheral surface side concave portions of the other rim portion is on the same plane as the axially outer peripheral inclined surface portion. The described radial needle bearing retainer. Of the outer peripheral surface in the axial direction of the one rim portion, an outer diameter side tapered surface portion inclined in a direction in which the outer diameter increases toward the inner side in the axial direction is provided between the outer peripheral surface side concave portions.
Among the axially outer end surfaces of the other rim portion, an inner diameter side tapered surface portion that is inclined in a direction in which the inner diameter becomes smaller toward the inner side in the axial direction is provided between the inner peripheral surface side concave portions. Item 10. A radial needle bearing retainer according to item 1.

Images