JP2017223305A - Thrust roller bearing and thrust roller bearing holder - Google Patents

Abstract

[PROBLEMS] To provide a thrust roller bearing capable of suppressing the occurrence of cracks and microcracks in a cage, and a cage for a thrust roller bearing. An annular retainer (3) that retains a plurality of rollers (2) in a rollable manner is provided, and the retainer (3) is a first formed on the outside of a plurality of first retaining holes (44) that retain the plurality of rollers (2). A plurality of outer annular portions 42, a first inner annular portion 41 formed inside the first holding hole 44, and a plurality of first outer annular portions 42 and the first inner annular portion 41 connected in the radial direction. An outer cage 4 having a first pillar portion 43, a second outer annular portion 52 formed outside a plurality of second holding holes 54 for holding the plurality of rollers 2, and a second holding hole 54. An inner holding having a second inner ring part 51 formed inside the inner ring part, a plurality of second pillar parts 53 linking the second outer ring part 52 and the second inner ring part 51 in the radial direction. The inner holder 5 has a plurality of locking claws 6 that are locked to the periphery of the first holding hole 44. [Selection] Figure 2

Description

  The present invention relates to a thrust roller bearing and a retainer for a thrust roller bearing.

  Conventionally, there is known a thrust roller bearing in which a plurality of rollers are interposed between two opposed races so as to allow rolling. The thrust roller bearing is inserted, for example, between a non-rotating member and a rotating member in a vehicle transmission, and is used to smoothly rotate the rotating member while receiving a thrust force in the direction of the rotating shaft.

  In the thrust roller bearing, the plurality of rollers are held in a rollable manner in a cage disposed between two races. As a cage used for a thrust roller bearing, a combination of two plate materials (hereinafter referred to as a two-sheet cage) is known (for example, see Patent Document 1).

  The two-piece cage is configured by combining an outer cage, which is one plate material, and an inner cage, which is the other plate material. The outer cage and the inner cage are integrated by caulking the outer circumference of the outer cage while the inner cage is housed in the outer cage.

  A plurality of holding holes for holding a plurality of rollers are formed in the outer holder and the inner holder, respectively. The width of the holding hole is formed to be smaller than the diameter of the roller, and the roller is prevented from dropping from the cage by engaging the roller with the outer cage or the inner cage at the periphery of the holding hole.

  Since the width of the retaining hole is smaller than the diameter of the roller, when assembling the retainer, the inner retainer is accommodated in the outer retainer with the roller disposed in the retaining hole of the inner retainer, and the outer retainer And the inner cage need to be integrated by caulking.

JP 2008-075752 A

  By the way, the cage is made of a different material and is subjected to different heat treatments and different finishing processes. Therefore, heat treatment cannot be performed in a state where the cage is integrated.

  Therefore, in the conventional thrust roller bearing, it is necessary to caulk the outer cage and the inner cage that have been previously subjected to heat treatment, surface processing, and the like. Since the outer cage and the inner cage after heat treatment have high surface hardness, if a tensile stress exceeding the material strength is generated during caulking, cracking or microcracking occurs in the caulking portion.

  Then, an object of this invention is to provide the thrust roller bearing which can suppress that a crack and a microcrack generate | occur | produce in a cage, and the cage for thrust roller bearings.

  In order to achieve the above object, the present invention includes a plurality of rollers and an annular cage that holds the plurality of rollers in a rollable manner, and the cage holds a plurality of rollers that hold the plurality of rollers. A first outer ring portion formed outside the first holding hole; a first inner ring portion formed inside the first holding hole; the first outer ring portion; and the first inner circle. A first retainer having a plurality of first pillar portions that connect the ring portion in a radial direction and restrict movement of the rollers in one direction in the axial direction of the retainer, and retain the plurality of rollers A second outer ring portion formed outside the plurality of second holding holes, a second inner ring portion formed inside the second holding hole, the second outer ring portion, and the second A plurality of second pillar portions that connect the two inner ring portions in the radial direction and restrict movement of the rollers in other directions in the axial direction of the cage; And a second retainer having a, the second retainer has a plurality of engaging claws engaged with the peripheral edge of the first holding hole, provides a thrust roller bearing.

  In order to achieve the above object, the present invention is an annular thrust roller bearing retainer that holds a plurality of rollers in a rollable manner, outside the plurality of first holding holes that hold the plurality of rollers. The first outer ring portion formed in the first holding ring, the first inner ring portion formed inside the first holding hole, the first outer ring portion and the first inner ring portion in the radial direction. And a plurality of first holders that restrict the movement of the rollers in one axial direction of the cage, and a plurality of second holders that hold the plurality of rollers. A second outer ring part formed outside the hole, a second inner ring part formed inside the second holding hole, the second outer ring part, and the second inner ring part. And a plurality of second pillars that restrict the movement of the rollers in other directions in the axial direction of the cage. Comprises a retainer, said second retainer has a plurality of engaging claws engaged with the peripheral edge of the first holding hole, provides a cage for a thrust roller bearing.

  ADVANTAGE OF THE INVENTION According to this invention, the thrust roller bearing which can suppress that a crack and a microcrack generate | occur | produce in a cage | basket, and the cage for thrust roller bearings can be provided.

It is a perspective view which shows the thrust roller bearing which concerns on this Embodiment. FIG. 2 is a broken sectional view of the thrust roller bearing of FIG. 1. It is sectional drawing which shows a cross section perpendicular | vertical to the circumferential direction of the thrust roller bearing of FIG. It is a perspective view of an inner side holder. (A), (b) is explanatory drawing explaining the assembly procedure of a holder | retainer.

[Embodiment]
An embodiment of the present invention will be described with reference to FIGS. In addition, although embodiment described below is shown as a suitable specific example in implementing this invention, although there are some parts which have illustrated various technical matters that are technically preferable. The technical scope of the present invention is not limited to this specific embodiment.

(Overall configuration of thrust roller bearing 1)
FIG. 1 is a perspective view showing a thrust roller bearing 1 according to the present embodiment, FIG. 2 is a broken sectional view thereof, and FIG. 3 is a sectional view showing a section perpendicular to the circumferential direction.

  As shown in FIGS. 1 to 3, the thrust roller bearing 1 includes a plurality of cylindrical rollers 2, an annular cage (thrust roller bearing cage) 3 that holds the plurality of rollers 2 in a rollable manner, It has. Although not shown, the thrust roller bearing 1 has two races that are arranged to face each other so as to sandwich the cage 3 and have raceways on which a plurality of rollers 2 roll.

  The thrust roller bearing 1 is used, for example, in a transmission of a vehicle, and is inserted between a shaft-like rotating member and a non-rotating member such as a transmission housing, and a plurality of rollers 2 held by a cage 3 are rolled. Thus, the rotation of the rotating member is made smooth while receiving the axial thrust force.

(Description of cage 3)
The cage 3 is formed by combining an outer cage 4 and an inner cage 5. The outer cage 4 is an embodiment of the first cage of the present invention, and the inner cage 5 is an embodiment of the second cage of the present invention.

  The outer cage 4 includes a first outer ring portion 42 formed outside the plurality of first holding holes 44 that hold the plurality of rollers 2, and a first inner circle formed inside the first holding hole 44. The ring portion 41, the first outer ring portion 42, and the first inner ring portion 41 are connected in the radial direction, and the roller 2 moves in one direction in the axial direction of the cage 3 (upward in FIG. 3). And a plurality of first pillar portions 43 that regulate the above.

  The first inner annular portion 41 and the first outer annular portion 42 are formed concentrically to form a pair, and together with the first pillar portion 43, the first holding hole 44 is formed. The first holding hole 44 is a rectangular through hole having a long side extending along the radial direction of the outer cage 4 and penetrating the outer cage 4 in the thickness direction (axial direction). The outer holder 4 has a plurality of first holding holes 44 of the same number (30 in this embodiment) as the plurality of rollers 2 so as to hold the plurality of radially arranged rollers 2 in a rollable manner. It is formed radially. The width of the first holding hole 44 in the short side direction is smaller than the diameter of the roller 2.

  In the present embodiment, the first inner annular portion 41 includes a plate-like and annular vertical portion 41a that is perpendicular to the axial direction, and a short cylinder that extends in the axial direction from the inner peripheral end of the vertical portion 41a. And a cylindrical portion 41b. A connecting portion between the vertical portion 41a and the tube portion 41b is formed in a rounded shape.

  The first outer annular portion 42 includes a plate-like and annular vertical portion 42a perpendicular to the axial direction, and a short cylindrical tube portion 42b extending in the axial direction from the outer peripheral end of the vertical portion 42a. And integrally. A connecting portion between the vertical portion 42a and the cylindrical portion 42b is formed in a rounded shape.

  The vertical portions 41a and 42a of the first inner annular portion 41 and the first outer annular portion 42 are coaxially arranged at the same position in the axial direction. Further, the cylindrical portions 41b and 42b of the first inner annular portion 41 and the first outer annular portion 42 extend in the same axial direction from the vertical portions 41a and 42a, and extend from the vertical portions 41a and 42a. The lengths are equally formed and are arranged coaxially. The first column portion 43 is formed perpendicular to the axial direction, and connects the vertical portions 41 a and 42 a of the first inner annular portion 41 and the first outer annular portion 42.

  FIG. 4 is a broken sectional view of the inner cage 5. As shown in FIGS. 1 to 4, the inner cage 5 includes a second outer annular portion 52 formed outside the plurality of second holding holes 54 that hold the plurality of rollers 2, and the second holding holes 54. The second inner annular part 51 formed on the inner side, the first outer annular part 52 and the first inner annular part 51 are connected in the radial direction, and the other direction in the axial direction of the cage 3 (in FIG. 3) And a plurality of second pillar portions 53 for restricting the movement of the roller 2 in the downward direction.

  The second inner annular portion 51 and the second outer annular portion 52 are formed concentrically to form a pair, and together with the second pillar portion 53, form a second holding hole 54. The second holding hole 54 is a rectangular through hole having a long side extending along the radial direction of the inner cage 5 and penetrating the inner cage 5 in the thickness direction (axial direction). The inner holder 5 has a plurality of second holding holes 54 as many as the plurality of rollers 2 (30 in this embodiment) so as to hold the plurality of radially arranged rollers 2 in a rollable manner. It is formed radially. The width of the second holding hole 54 in the short side direction is smaller than the diameter of the roller 2.

  In the present embodiment, the second inner annular portion 51 and the second outer annular portion 52 are formed in a coaxial short cylindrical shape, and the second pillar is connected so as to connect one end portions thereof in the axial direction. A portion 53 is provided.

  The inner cage 5 is accommodated in the outer cage 4. In the present embodiment, the entire inner cage 5 is accommodated in the outer cage 4, but a part of the inner cage 5 may protrude from the outer cage 4. The inner cage 5 is inserted into the outer cage 4 from the tip ends (the end opposite to the side where the second column portion 53 is provided) of the second inner ring portion 51 and the second outer ring portion 52. Is housed.

  In order to allow the inner cage 5 to be accommodated in the outer cage 4, the inner diameter of the second inner annular portion 51 of the inner cage 5 is set so that the cylindrical portion 41 b of the first inner annular portion 41 in the outer cage 4 It is slightly larger than the outer diameter. The outer diameter of the second outer annular portion 52 of the inner cage 5 is slightly smaller than the inner diameter of the cylindrical portion 41 b of the first outer annular portion 42 in the outer cage 4.

(Description of the locking claw 6)
In the thrust roller bearing 1 according to the present embodiment, the inner cage 5 has a plurality of locking claws 6 that are locked to the periphery of the first holding hole 44. The outer cage 4 and the inner cage 5 are fixed by stopping. The plurality of locking claws 6 include an inner peripheral side locking claw 61 formed on the second inner annular portion 51 and an outer peripheral side locking claw 62 formed on the second outer annular portion 52. Yes.

  In the present embodiment, an inner peripheral side locking claw 61 that is locked to the first inner circular portion 41 (vertical portion 41 a) at the periphery of the first holding hole 44 at the distal end portion of the second inner circular portion 51. And an outer peripheral side locking claw that is locked to the first outer annular portion 42 (vertical portion 42a) at the peripheral edge of the first holding hole 44 at the tip of the second outer annular portion 52. 62 is formed. The inner peripheral side locking claw 61 is locked to the short side on the inner peripheral side of the rectangular first holding hole 44, and the outer peripheral side locking claw 62 is locked to the short side on the outer peripheral side of the first holding hole 44. Is done.

  The inner peripheral side claw 61 includes a shaft portion 61a that protrudes in the axial direction from the tip portion of the second inner annular portion 51, and a claw portion 61b that protrudes inward in the radial direction from the tip portion of the shaft portion 61a. Have one. The inner peripheral side locking claw 61 is formed integrally with the second inner annular portion 51. The shaft portion 61 a is formed in an arc shape when viewed from the axial direction, and the outer peripheral surface thereof is continuous with the outer peripheral surface of the second inner annular portion 51.

  The outer peripheral side locking claw 62 integrally includes a shaft portion 62a that protrudes in the axial direction from the tip portion of the second outer ring portion 52 and a claw portion 62b that protrudes radially outward from the tip portion of the shaft portion 62a. Have. The outer peripheral side locking claw 62 is formed integrally with the second outer annular portion 52. The shaft portion 62 a is formed in an arc shape when viewed from the axial direction, and the inner peripheral surface thereof is continuous with the inner peripheral surface of the second outer annular portion 52.

  The inner peripheral side locking claw 61 and the outer peripheral side locking claw 62 form a pair, and the inner peripheral side locking claw 61 and the outer peripheral side locking claw 62 forming a pair are opposed to each other in the radial direction. Further, the inner peripheral side locking claws 61 and the outer peripheral side locking claws 62 forming a pair are locked together in the corresponding first holding holes 44.

  In the present embodiment, the same number of locking claws 61 and 62 as the first holding holes 44 are formed, and the locking claws 61 and 62 are locked in all the first holding holes 44, but this is not limitative. Instead, the number of the locking claws 61 and 62 may be smaller than the number of the first holding holes 44. However, when the number of the locking claws 61 and 62 is one or two, the outer retainer 4 and the inner retainer 5 cannot be firmly fixed and they may be separated or the outer retainer 4 and the inner retainer 5 may be separated from each other. Since there may be a case where rattling occurs between the cages 5, it is desirable that the number of the locking claws 61, 62 is three or more and the locking claws 61, 62 are arranged at equal intervals in the circumferential direction. .

  Further, in the present embodiment, the inner peripheral side locking claw 61 and the outer peripheral side locking claw 62 are formed as the locking claw 6, but either the inner peripheral side locking claw 61 or the outer peripheral side locking claw 62 is provided. One may be omitted. That is, the cage 3 may have only one of the inner peripheral side locking claws 61 and the outer peripheral side locking claws 62.

  The rollers 2 are disposed between the inner peripheral side locking claws 61 and the outer peripheral side locking claws 62. Thereby, the movement to the outer peripheral side of the inner peripheral side locking claw 61 and the movement to the inner peripheral side of the outer peripheral side locking claw 62 are restricted by the roller 2, and the locking by the locking claws 61, 62 is released. It becomes possible to suppress that the outer retainer 4 and the inner retainer 5 are separated. That is, in the thrust roller bearing 1, the roller 6 suppresses the role as a rolling element and the engagement of the locking claw 6 being released, and maintains the outer cage 4 and the inner cage 5 integrally. It also serves as a role.

  The gap between the locking claws 61, 62 and 2 is the length of the claw portions 61b, 62b (from the shaft portions 61a, 62a so that the locking is not released even if the locking claws 61, 62 are elastically deformed. It is preferable to set as appropriate in consideration of the projection length. More specifically, the width of the gap formed between the locking claws 61, 62 and 2 between the locking claws 61, 62 is set to the first inner annular portion 41 of the inner circumferential side locking claw 61. It may be smaller than the allowance with (vertical portion 41 a) and the allowance with the first outer ring portion 42 (vertical portion 42 a) of the outer peripheral side locking claw 62.

(Material of outer cage 4 and inner cage 5)
In the present embodiment, the outer cage 4 is made of metal, and the inner cage 5 is made of resin.

  In the present embodiment, the outer cage 4 is formed by punching and bending a steel plate with a press or the like. Since the outer cage 4 occupies most of the outer surface of the cage 3, the mechanical strength of the cage 3 can be maintained and the durability can be improved by making the outer cage 4 made of metal. In addition, since the outer cage 4 is less likely to be deformed compared to the case where the outer cage 4 is made of resin, the latching by the latching claws 6 is not easily released, and the outer cage 4 and the inner cage 5 are not released. Can be prevented from separating.

  Moreover, in this Embodiment, the inner side holder | retainer 5 is formed by injection molding. In order to prevent the locking claws 6 from being broken at the time of releasing from the mold, it is desirable to use a mold that can be separated on the inner peripheral side and the outer peripheral side during injection molding. Examples of the resin used for the inner cage 5 include 66 nylon, 46 nylon, PEEK (polyether ether ketone), PPS (polyphenylene sulfide), and the like. Moreover, in order to suppress wear of the inner cage 5 due to rolling of the rollers 2, it is desirable that the inner cage 5 contains glass fibers (glass filler).

  By making the inner cage 5 made of resin, it becomes easy to mold into a complicated shape having the locking claws 6. Further, since the resin is easily deformed as compared with the metal, the roller 2 can be fitted through the second holding hole 54 after the outer cage 4 and the inner cage 5 are integrated. As a result, the assemblability of the thrust roller bearing 1 can be improved, and the release of the locking claw 6 by the roller 2 can be suppressed.

(Assembly procedure of cage 3)
First, the outer cage 4 is formed by punching and bending a steel plate and the inner cage 5 is formed by injection molding or the like. The outer cage 4 is in a state in which heat treatment, surface processing, and the like have been performed in advance.

  Thereafter, the inner cage 5 is inserted into the outer cage 4 so that the outer cage 4 and the inner cage 5 are integrated. At this time, as shown in FIG. 5 (a), the inner peripheral side locking claws 61 are elastically deformed toward the outer peripheral side, and are also elastically deformed toward the inner peripheral side of the outer peripheral side locking claws 62. , 62 are inserted into the first holding hole 44. When the insertion of the inner cage 5 is further advanced, both the locking claws 61 and 62 are locked to the peripheral edge of the first holding hole 44, and the outer cage 4 and the inner cage 5 are integrated.

  Thereafter, as shown in FIG. 5B, the roller 2 is pushed into the cage 3 from the second holding hole 54 of the inner cage 5 made of resin. At this time, the second column part 53 at the periphery of the second holding hole 54 is elastically deformed, and the roller 2 is pushed into the cage 3. When the rollers 2 are pushed into all the holding holes 44 and 54, the state shown in FIG. 1 is obtained, and the assembly of the cage 3 is completed.

(Operation and effect of the embodiment)
As described above, in the thrust roller bearing 1 according to the present embodiment, the inner cage 5 has a plurality of latching claws 6 that are latched to the periphery of the first retaining hole 44.

  By locking the outer cage 4 and the inner cage 5 with the locking claws 6, there is no need to crimp the outer cage 4 and the inner cage 5. It becomes possible to suppress the occurrence of cracks.

  Further, in the present embodiment, since the roller 2 is disposed between the inner peripheral side locking claw 61 and the outer peripheral side locking claw 62, the locking of the locking claw 6 is released by the roller 2. This can be suppressed, and the outer cage 4 and the inner cage 5 are more difficult to separate.

  Furthermore, in this embodiment, since the outer cage 4 is made of metal and the inner cage 5 is made of resin, the outer cage 4 and the inner cage 5 are separated from each other by making the outer cage 4 difficult to deform. The roller 2 can be attached after the outer cage 4 and the inner cage 5 are integrated, and the assemblability of the thrust roller bearing 1 can be improved.

DESCRIPTION OF SYMBOLS 1 ... Thrust roller bearing, 2 ... Roller, 3 ... Cage (Thrust roller bearing cage), 4 ... Outer cage (1st cage), 41 ... 1st inner ring part, 41a ... Vertical part, 41b ... Cylinder part, 42 ... First outer ring part, 42a ... Vertical part, 42b ... Cylinder part, 43 ... First column part, 44 ... First holding hole, 5 ... Inner holder (second holder), 51 ... 2nd inner ring part, 52 ... 2nd outer ring part, 53 ... 2nd pillar part, 54 ... 2nd holding hole, 6 ... Locking claw, 61 ... Inner peripheral side locking claw, 61a ... Shaft part , 61b ... claw part, 62 ... outer peripheral side locking claw, 62a ... shaft part, 62b ... claw part

Claims (5)

A plurality of rollers, and an annular cage that holds the plurality of rollers in a rollable manner,
The cage is
A first outer ring portion formed outside a plurality of first holding holes for holding the plurality of rollers; a first inner ring portion formed inside the first holding hole; and the first outer portion. A first holding having a plurality of first pillar portions that connect the annular portion and the first inner annular portion in a radial direction and restrict movement of the roller in one direction in the axial direction of the cage. And
A second outer ring portion formed outside the plurality of second holding holes holding the plurality of rollers, a second inner ring portion formed inside the second holding hole, and the second outer portion. A second holding portion having a plurality of second pillar portions that connect the annular portion and the second inner annular portion in a radial direction and restrict movement of the roller in the other direction in the axial direction of the cage; And having
The second cage has a plurality of locking claws locked to the periphery of the first holding hole.
Thrust roller bearing. The plurality of locking claws are:
An outer peripheral side locking claw that is formed on the second outer ring part and is locked to the first outer ring part at the periphery of the first holding hole;
An inner peripheral side locking claw that is formed on the second inner ring part and is locked to the second inner ring part at the periphery of the first holding hole,
The thrust roller bearing according to claim 1. The roller is disposed between the outer peripheral side locking claw and the inner peripheral side locking claw,
The thrust roller bearing according to claim 2. The first cage is made of metal;
The second cage is made of resin;
The thrust roller bearing according to any one of claims 1 to 3. An annular thrust roller bearing retainer that holds a plurality of rollers in a rollable manner,
A first outer ring portion formed outside a plurality of first holding holes for holding the plurality of rollers; a first inner ring portion formed inside the first holding hole; and the first outer portion. A first holding having a plurality of first pillar portions that connect the annular portion and the first inner annular portion in a radial direction and restrict movement of the roller in one direction in the axial direction of the cage. And
A second outer ring portion formed outside the plurality of second holding holes holding the plurality of rollers, a second inner ring portion formed inside the second holding hole, and the second outer portion. A second holding portion having a plurality of second pillar portions that connect the annular portion and the second inner annular portion in a radial direction and restrict movement of the roller in the other direction in the axial direction of the cage; And having
The second cage has a plurality of locking claws locked to the periphery of the first holding hole.
Thrust roller bearing cage.

Images