JP2017036831A - Thrust roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thrust roller bearing which can suppress various problems caused by sliding friction of a roller.SOLUTION: A thrust roller bearing 1 receiving at least a thrust load includes a roller group 2 constituted by a plurality of rollers 22 radially arranged on a raceway surface and arranged in a radial direction DD of the rollers 22 in plural stages, and a retainer 3 having a plural stages of pockets 32 for storing the rollers 22 constituting the roller group 2. The number of the rollers 22B constituting a roller group 2B on an outer side of the radial direction DD is larger than the number of the rollers 22A constituting a roller group 2A on an inner side of the radial direction DD.SELECTED DRAWING: Figure 1A

Description

  The present invention relates to a thrust roller bearing configured such that a plurality of rollers rolling on a raceway surface are held radially by a cage.

  A thrust roller bearing that receives a thrust load includes a plurality of radially arranged rollers (rolling elements), and is inserted between a non-rotating member and a rotating member in, for example, a vehicle transmission or a windmill device, and has a rotational axis direction. Used for smooth rotation of the rotating member while receiving a thrust force. The thrust roller bearing includes, for example, a plurality of rollers arranged radially on the raceway surface, and a cage having pockets for storing the rollers (see Patent Document 1).

JP 2010-281406 A

  In thrust roller bearings, there is a difference in peripheral speed (circumferential speed difference) between the inner and outer circumferences of the bearing ring during use, and this causes slippage between the bearing ring and the outer ring side. There is a characteristic that occurs. When slipping occurs, there arises a problem that the rotational resistance between the raceway and the ring increases due to sliding friction, and wear of the rollers and raceway increases on the outer peripheral side.

  An object of this invention is to provide the thrust roller bearing which can suppress the various malfunction resulting from the sliding of a roller.

  The present invention is a thrust roller bearing that receives at least a thrust load, and is a group of rollers composed of a plurality of rollers arranged radially on a raceway surface, and a group of rollers arranged in a plurality of rows in the radial direction of the rollers. And a cage having a plurality of rows of pockets for storing the rollers constituting the roller group, and the number of the rollers constituting the roller group on the outer side in the radial direction is set on the inner side in the radial direction. The present invention relates to a thrust roller bearing that is larger than the number of the rollers constituting the roller group.

  The cage may be composed of a plurality of cage elements arranged in the radial direction, and the cage element may have a row of pockets corresponding to the row of rollers.

  The plurality of cage elements may be freely connected or separated in the radial direction.

  The plurality of cage elements may not be coupled in the radial direction.

  The pocket extends in the radial direction, opens to the outside in the radial direction and closes to the inside in the radial direction, and opens in the thickness direction of the cage, The roller protrudes in the thickness direction of the retainer from the retainer through the opening in the thickness direction of the retainer in the pocket in the state of being accommodated in the pocket. The roller may be prevented from coming off from the opening in the thickness direction of the cage in the pocket.

  Also, the radially outward open end of the pocket of the retainer element inside the radial direction is blocked by the retainer element outside the radial direction, and the inside of the radial direction The rollers housed in the pockets of the cage element may be restricted from coming out outward in the radial direction.

  The present invention is a thrust roller bearing that receives at least a thrust load, and has a roller group composed of a plurality of rollers arranged radially on a raceway surface and a pocket that accommodates the rollers constituting the roller group. The pocket extends in the radial direction, opens to the outside in the radial direction and closes to the inside in the radial direction, and opens in the thickness direction of the cage. And the roller protrudes in the thickness direction of the cage from the cage through the opening in the thickness direction of the cage in the pocket in the state of being accommodated in the pocket, The pocket relates to a thrust roller bearing that restricts the roller from slipping out of an opening in the thickness direction of the cage in the pocket.

  The thrust roller bearing may be a thrust roller bearing that receives a thrust load and a radial load, and the raceway surface may be conical.

  Further, the roller may have a substantially conical shape constricted toward the inner side in the radial direction of the roller.

  Moreover, the said roller and / or the said holder | retainer may be formed from the fluororesin.

  ADVANTAGE OF THE INVENTION According to this invention, the thrust roller bearing which can suppress the various malfunction resulting from roller sliding can be provided.

It is a top view which shows the thrust roller bearing 1 of 1st Embodiment of this invention in the state which abbreviate | omitted the bearing ring. It is a bottom view in FIG. 1A. It is a front view in FIG. 1A. It is the ABC sectional view taken on the line in FIG. 1A. It is a top view which shows the inner side retainer element 33A. It is a front view in FIG. 3A. It is the figure which changed the direction of FIG. 3B. FIG. 3B is a view corresponding to FIG. 3A, showing a state in which the rollers 22A are virtually taken out of the pockets 32A. FIG. 3C is a view corresponding to FIG. 3C, showing a state in which the rollers 22A are virtually taken out of the pockets 32A. It is a bottom view which shows the outer side retainer element 33B. It is a front view in FIG. 5A. It is the figure which changed direction of FIG. 5B. FIG. 5B is a diagram corresponding to FIG. FIG. 5C is a diagram corresponding to FIG. 2B is an exploded cross-sectional view of FIG. 2B showing the outer retainer element 33B. FIG. FIG. 3B is an exploded cross-sectional view of FIG. 2B showing the inner retainer element 33A. FIG. 2B is a view corresponding to FIG. 2A, showing the thrust roller bearing 1 of the first embodiment of the present invention in a state including the race rings 6 and 7. FIG. 2B is a view corresponding to FIG. 2B, showing the thrust roller bearing 1 of the first embodiment of the present invention in a state including the race rings 6 and 7. It is a top view which shows the thrust roller bearing 1A of 2nd Embodiment of this invention in the state which abbreviate | omitted the bearing ring. It is a front view which shows the thrust roller bearing 101 of 3rd Embodiment of this invention in the state which abbreviate | omitted the bearing ring. It is a top view in FIG. 10A. FIG. 10B is a diagram corresponding to FIG. It is sectional drawing which shows the thrust roller bearing 101 of 3rd Embodiment of this invention in the state containing a bearing ring 106,107. It is sectional drawing which shows the state which abbreviate | omitted the track rings 106 and 107 and the roller 122 from the state shown in FIG. It is a front view which shows the thrust roller bearing 201 of 4th Embodiment of this invention in the state which abbreviate | omitted the bearing ring. It is a top view in FIG. 14A. It is a figure which shows the state which took out the roller 222B from the pocket 232B virtually, and is a top view which shows the outer side retainer element 233B. It is a figure which shows the state which took out the roller 222A from the pocket 232A virtually, and is a top view which shows the inner side retainer element 233A. It is sectional drawing which shows the thrust roller bearing 201 of 4th Embodiment of this invention in the state containing a raceway ring 206,207. It is sectional drawing which expanded FIG. 16A. It is sectional drawing which shows the state which abbreviate | omitted the track rings 206 and 207 and roller 222A, 222B from the state shown to FIG. 16B. It is a perspective view which shows a 1st modification, and shows outer race 6A. It is a perspective view which shows a 1st modification, and shows the inner race 7A. It is sectional drawing which shows a 1st modification, and is a figure corresponding to FIG. 8B. It is a top view which shows a 2nd modification, and is a figure corresponding to FIG. 1A.

[First Embodiment]
A thrust roller bearing 1 according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1A is a plan view showing the thrust roller bearing 1 according to the first embodiment of the present invention in a state in which a bearing ring is omitted. FIG. 1B is a bottom view of FIG. 1A. FIG. 2A is a front view of FIG. 1A. 2B is a cross-sectional view taken along the line ABC in FIG. 1A. FIG. 3A is a plan view showing the inner cage element 33A. FIG. 3B is a front view of FIG. 3A. FIG. 3C is a diagram in which the orientation of FIG. 3B is changed. FIG. 4A is a diagram corresponding to FIG. FIG. 4B is a diagram corresponding to FIG. FIG. 5A is a bottom view showing the outer retainer element 33B. FIG. 5B is a front view of FIG. 5A. FIG. 5C is a diagram in which the orientation of FIG. 5B is changed. FIG. 6A is a diagram corresponding to FIG. FIG. 6B is a diagram corresponding to FIG. FIG. 7A is an exploded cross-sectional view of FIG. 2B showing the outer retainer element 33B. FIG. 7B is an exploded cross-sectional view of FIG. 2B showing the inner cage element 33A. FIG. 8A is a view corresponding to FIG. 2A showing the thrust roller bearing 1 according to the first embodiment of the present invention in a state including the race rings 6 and 7. FIG. 8B is a diagram corresponding to FIG. 2B, showing the thrust roller bearing 1 according to the first embodiment of the present invention in a state including the race rings 6 and 7.

  The thrust roller bearing 1 of the first embodiment is a thrust roller bearing that substantially receives only a thrust load. As shown in FIGS. 1A to 8B, the thrust roller bearing 1 of the first embodiment includes a roller group 2, a cage 3, and an outer race 6 as an outer race (outer ring) (see FIGS. 8A and 8B). And an inner race 7 (see FIGS. 8A and 8B) as an inner race (inner ring).

  As shown in FIGS. 8A and 8B, the cage 3 is disposed between the outer race 6 and the inner race 7. As shown in FIGS. 1A to 6B, the plurality of rollers 22 constituting the roller group 2 are held in a pocket 32 formed in the cage 3 so as to be able to roll.

  The thrust roller bearing 1 is used, for example, in a vehicle transmission or a windmill device. As shown in FIGS. 8A and 8B, the thrust roller bearing 1 has a stepped shaft-like rotating member 75 inserted into the inner peripheral side of the inner race 7 and an outer race 6. It is inserted between the housing 65 facing. The thrust roller bearing 1 smoothly supports the rotation of the rotating member 75 while receiving the axial thrust force of the rotating member 75 by the rolling of the plurality of rollers 22 held by the cage 3.

  The outer race 6 includes an annular raceway portion 61 on which a raceway surface 61a on which a plurality of rollers 22 roll, and a short cylindrical outer circumference wall that extends perpendicularly from the outer circumference end of the raceway portion 61 to the raceway surface 61a. The unit 62 is integrally provided. The raceway surface 61a is on a plane orthogonal to the rotation axis J1 and is disposed to face the raceway surface 71a of the inner race 7.

The inner race 7 has an annular track portion 71 formed with a track surface 71a on which a plurality of rollers 22 roll, and a short cylindrical shape extending from the inner peripheral end of the track portion 71 perpendicular to the track surface 71a. And an inner peripheral wall portion 72. The raceway surface 71 a is disposed to face the raceway surface 61 a of the outer race 6 so as to be parallel to the raceway surface 61 a.
The stepped shaft-like rotating member 75 is pressed into the stepped portion so as to stride over the track portion 71 and the inner peripheral wall portion 72 of the inner race 7.

  As shown in FIGS. 1A to 8B, the roller group 2 includes a plurality of rollers 22 that extend radially on the raceway surfaces 61a and 71a and are arranged at intervals in the circumferential direction DR. The roller group 2 (2A, 2B) is arranged in a plurality of rows (two rows in the present embodiment) in the radial direction DD of the rollers 22. The roller 22 is a cylindrical roller having a cylindrical outer periphery.

  The cage 3 has an annular plate shape in plan view. The outer peripheral wall 62 of the outer race 6 is slightly larger than the outer periphery of the cage 3. Therefore, the cage 3 disposed on the track portion 61 of the outer race 6 can smoothly rotate inside the outer peripheral wall portion 62.

  The cage 3 has a plurality of rows of pocket groups 31 that house the rollers 22 constituting the roller group 2. The pocket group 31 includes a plurality of pockets 32 arranged at intervals in the circumferential direction DR. The pocket groups 31 (31A, 31B) are arranged in a plurality of rows (in this embodiment, two rows) in the radial direction DD of the rollers 22. The pockets 32 are radially provided in the same number as the plurality of rollers 22 so as to hold the plurality of radially arranged rollers 22 in a rollable manner.

  The cage 3 is composed of a plurality of cage elements 33 arranged in the radial direction DD. In the present embodiment, the retainer 3 includes a (first) retainer element 33A (see FIGS. 3A and 4A) inside the radial direction DD and a (second) retainer element outside the radial direction DD. 33B (see FIGS. 5A and 6A). Each cage element 33 (33A, 33B) has one row of pocket groups 31 (pockets 32) corresponding to one row of roller groups 2. Specifically, the inner first cage element 33A has an inner pocket group 31A (pocket 32A) corresponding to the inner first roller group 2A. The outer second cage element 33B has an outer pocket group 31B (pocket 32B) corresponding to the outer second roller group 2B.

  The pocket 32 has a cylindrical inner peripheral shape that can accommodate the roller 22 corresponding to the outer peripheral shape of the cylindrical roller 22. In each cage element 33, the pocket 32 extends in the radial direction DD and is open at the outer open end 41 outside the radial direction DD. The pocket 32 has a bottom 42 inside the radial direction DD and is closed. In each cage element 33, the roller 22 does not protrude from the outer open end 41 of the pocket 32 to the outer side in the radial direction DD or is substantially flush with the cage 32 in the state of being accommodated in the pocket 32.

  The pockets 32 are opened at the thickness direction opening portions 43 and 43 on both sides of the cage 3 in the thickness direction DT. When the roller 22 is housed in the pocket 32, the roller 22 protrudes in the thickness direction of the cage 3 through the thickness direction opening portion 43 in the pocket 32.

  The pocket 32 restricts the roller 22 from coming off from the opening portion 43 in the thickness direction in the pocket 32. Specifically, as shown in FIGS. 3C and 5C, the thickness direction opening portion 43 has a width (diameter) of the cylindrical roller 22 when viewed in a direction (radial direction DD) extending the pocket 32 and the roller 22. ) Is narrower than. Therefore, the roller 22 does not come out of the thickness direction opening portion 43 in the pocket 32.

  Further, as described above, in each cage element 33, the pocket 32 is open at the outer open end 41 outside the radial direction DD, and has a bottom 42 inside the radial direction, Closed. Therefore, in each cage element 33, the roller 22 can be inserted into the pocket 32 via the outer open end 41 (only) inward in the radial direction DD, and inserted into the pocket 32. The rollers 22 can be extracted (only) toward the outside in the radial direction DD via the outer open end 41.

  The plurality of retainer elements 33 adjacent to the radial direction DD can be connected or separated in the radial direction DD by the connection engaging portion 35. In the present embodiment, the coupling engagement portion 35 includes a first engagement portion 35A and a second engagement portion 35B. A plurality of first engaging portions 35A are provided on the outer peripheral portion of the inner (first) cage element 33A, spaced apart in the circumferential direction DR. A plurality of second engaging portions 35B are provided in the inner peripheral portion of the (second) retainer element 33B outside the radial direction DD and spaced apart in the circumferential direction DR. The first engagement portion 35A and the second engagement portion 35B are disposed at positions where they can engage with each other, and can be engaged with each other. In a state where the first engagement portion 35A and the second engagement portion 35B are engaged, the inner (first) retainer element 33A and the outer (second) retainer element 33B are connected. The

  In the state where the cage elements 33 (33A, 33B) adjacent to the radial direction DD are connected, the outer open end 41 in the radial direction DD in the pocket 32A of the cage element 33A inside the radial direction DD is the radial direction DD. The outer retainer element 33B is closed by the inner periphery. This restricts the rollers 22 housed in the pockets 32A of the cage element 33A inside the radial direction DD from coming out of the radial direction DD.

  The number of rollers 22B constituting the outer roller group 2B in the radial direction DD (12 in this embodiment) is the number of rollers 22A constituting the inner roller group 2A in the radial direction DD (8 in this embodiment). More). The difference in the number of rollers 22 constituting the roller group 2 in the cage element 33 adjacent to the radial direction DD is, for example, 2 to 10, preferably 3 to 8.

  In the present embodiment, the roller 22, the cage 3, the outer race 6 and the inner race 7 are made of a fluororesin. Examples of the fluororesin include PTFE, PFA, and FEP. Fluoropolymers have excellent properties such as chemical resistance, electrical insulation, heat resistance, low friction (self-lubricating), and machinability. Compared with metals and general resins, Suitable as a roller. The resin forming the rollers may be a resin other than a fluororesin. Further, the rollers and the like may be made of metal.

According to the thrust roller bearing 1 of 1st Embodiment, there exist the following effects, for example.
The thrust roller bearing 1 of the first embodiment is a roller group 2 composed of a plurality of rollers 22 arranged radially on the raceway surfaces 61 a and 71 a, and is arranged in a plurality of rows in the radial direction DD of the rollers 22. The group 2 and the cage 3 having a plurality of rows of pockets 32 for storing the rollers 22 constituting the roller group 2 are provided. The number of rollers 22B constituting the outer roller group 2B in the radial direction DD is larger than the number of rollers 22A constituting the inner roller group 2A in the radial direction DD.

Therefore, according to the first embodiment, the length of the roller 22 can be shortened compared to the case where a long roller is used in one row of roller groups, and the circumferential speed difference of the roller 22 in the radial direction DD is reduced. The slip of the roller 22 can be reduced. As a result, various problems caused by sliding of the rollers 22 (rotational resistance between the raceway surfaces 61a and 71a and 22 due to sliding friction increase, and wear of the rollers 22 and the raceway surfaces 61a and 71a increases on the outer peripheral side. Etc.) can be suppressed.
Moreover, in each roller group 2, the space | interval of the roller 22 of the circumferential direction DR can be equalize | homogenized, and the magnitude | size of the load which the one roller 22 receives can be equalized. Therefore, deformation of the roller 22 due to load concentration can be suppressed.

In the first embodiment, the cage 3 includes a plurality of cage elements 33 that can be connected or separated in the radial direction DD. The cage element 33 has one row of pockets 32 corresponding to one row of roller groups 2.
Therefore, according to 1st Embodiment, the multi-row pocket group which accommodates the multi-row roller group 2 is connected by connecting the retainer element 33 which has the single-row pocket 32 corresponding to the single-row roller group 2. 31 can be formed easily.

In the first embodiment, in each retainer element 33, the pocket 32 extends in the radial direction DD, opens to the outside of the radial direction DD and is closed to the inside of the radial direction DD, and the cage 3 in the thickness direction DT. The roller 22 protrudes in the thickness direction DT of the retainer 3 from the retainer 3 through the opening 43 in the thickness direction DT of the retainer 3 in the pocket 32 in the state of being accommodated in the pocket 32. The pocket 32 restricts the roller 22 from coming out of the opening 32 in the thickness direction DT of the cage 3 in the pocket 32.
Therefore, according to 1st Embodiment, the holder | retainer 3 (retainer element 33) which has the pocket 32 can be easily formed by a cutting process (for example, end mill process) or injection molding.

In the first embodiment, in a state where the cage elements 33 adjacent to each other in the radial direction DD are connected, the open end 41 outside the radial direction DD in the pocket 32 of the cage element 33 inside the radial direction DD is The rollers 22 are blocked by the cage element 33 outside the radial direction DD, and the rollers 22 housed in the pockets 32 of the cage element 33 inside the radial direction DD are restricted from coming out of the radial direction DD.
Therefore, according to the first embodiment, there is no need to separately provide a configuration for closing the open end 41 in the pocket 32A of the retainer element 33A inside the radial direction DD, and the adjacent retainer elements 33A and 33B are provided. If connected, the open end 41 in the pocket 32 can be closed.

In the first embodiment, the roller 22 and the cage 3 are made of a fluororesin. In particular, the roller 22, the cage 3, the outer race 6 and the inner race 7 are made of a fluororesin.
Therefore, according to 1st Embodiment, rotation of the roller 22 with respect to the holder | retainer 3 and rolling of the roller 22 with respect to the outer race 6 and the inner race 7 can be performed smoothly. Compared to metal rollers, etc., there is no rust on the rotating part, so thrust roller bearings installed in emergency facilities etc. are used in an emergency after being unused for a long time Even so, the rollers 22 can be smoothly rolled.

[Second Embodiment]
Next, a thrust roller bearing 1A according to a second embodiment will be described with reference to FIG. FIG. 9 is a plan view showing the thrust roller bearing 1A according to the second embodiment of the present invention in a state in which the bearing ring is omitted. The second embodiment will be described mainly focusing on differences from the first embodiment. In the second embodiment, the description of the first embodiment is appropriately applied to points that are not particularly described. Also in the second embodiment, the same effects as in the first embodiment are achieved.

Compared with the thrust roller bearing 1 of the first embodiment, the thrust roller bearing 1A of the second embodiment includes a coupling engagement portion 35 that couples a plurality of cage elements 33 (33A, 33B) adjacent in the radial direction DD. I do not have. That is, the plurality of cage elements 33 (33A, 33B) are not connected. Therefore, the inner (first) cage element 33A in the radial direction DD and the outer (second) cage element 33B in the radial direction DD rotate independently at different rotational speeds (number of rotations). can do. Other configurations in the second embodiment are the same as those in the first embodiment.
Therefore, according to the thrust roller bearing 1A of the second embodiment, the (second) cage element 33B outside the radial direction DD is faster than the (first) cage element 33A inside the radial direction DD. Can rotate at peripheral speed.

  In the second embodiment, in a state where the retainer 3 is disposed between the outer race 6 and the inner race 7, the outer open end 41 in the pocket 32A of the retainer element 33A on the inner side in the radial direction DD is: It is blocked by the cage element 33B outside the radial direction DD, and the rollers 22A housed in the pockets 32A of the cage element 33A inside the radial direction DD are restricted from coming out of the radial direction DD.

  According to the thrust roller bearing 1A of the second embodiment, the same effects as the thrust roller bearing 1 of the first embodiment are exhibited. Further, since the circumferential speed of the (second) cage element 33B outside the radial direction DD is larger (faster) than the circumferential speed of the (first) cage element 33A inside the radial direction DD, the rotational motion The torque loss load at can be reduced.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIGS. 10A to 13. FIG. 10A is a front view showing a thrust roller bearing 101 according to a third embodiment of the present invention in a state in which a bearing ring is omitted. FIG. 10B is a plan view of FIG. 10A. FIG. 11 is a diagram corresponding to FIG. 10B, showing a state in which the rollers 122 are virtually taken out of the pocket 132. FIG. 12 is a sectional view showing the thrust roller bearing 101 according to the third embodiment of the present invention in a state including the race rings 106 and 107. 13 is a cross-sectional view showing a state in which the race rings 106 and 107 and the rollers 122 are omitted from the state shown in FIG.

  The third embodiment will be described mainly with respect to differences from the first embodiment, and components similar to those of the first embodiment are denoted by +100. In the third embodiment, the description of the first embodiment is appropriately applied to points that are not particularly described. Also in the third embodiment, the same effects as in the first embodiment are achieved.

  The thrust roller bearing 101 of the third embodiment is a thrust roller bearing that receives a thrust load and a radial load. As shown in FIGS. 10A to 13, the thrust roller bearing 101 includes a plurality of rollers 122 arranged radially on the raceway surfaces 161 a and 171 a. The roller group 102 to be configured, the cage 103 having a pocket 132 for storing the roller 122 that configures the roller group 102, the outer raceway ring 106, and the inner raceway ring 107 are provided.

  In the third embodiment, as shown in FIGS. 10A to 13, the roller 122 as the rolling element is a “conical roller” having a substantially conical shape constricted toward the inside of the radial direction DD of the roller 122. In detail, as shown in FIG. 12, the space between the raceway surface 161a of the outer raceway ring 106 and the raceway surface 171a of the inner raceway ring 107 is reduced according to the radial direction DD from the outer peripheral side toward the inner peripheral side. It is a "conical roller" with a truncated cone shape. The outer race ring 106 and the inner race ring 107 each have a tapered surface corresponding to the inclined surface of the tapered roller 122.

  The outer race ring 106 and the inner race ring 107 are arranged coaxially and facing each other with a predetermined interval in the axial direction DJ. The outer raceway ring 106 and the inner raceway ring 107 are provided so as to be relatively rotatable about the rotation axis J1. Between the outer raceway ring 106 and the inner raceway ring 107, tapered rollers 122 are arranged at a certain interval in the circumferential direction DR. The plurality of tapered rollers 122 are rotatably supported around the central axis of the tapered rollers 122 by the truncated cone-shaped cage 3 having an open bottom. The interval between the tapered rollers 122 adjacent to each other in the circumferential direction is kept constant.

  As shown in FIG. 12, the outer race ring 106 and the inner race ring 107 are formed in a taper shape such that the spacing between the outer race ring 106 and the inner race ring 107 gradually decreases at the same rate from the outer peripheral side toward the inner peripheral side. Yes. In other words, the outer raceway 106 has a tapered raceway surface 161a that inclines in a direction away from the inner raceway 107 from the inner peripheral edge toward the outer peripheral edge. On the other hand, the inner raceway 107 has a tapered raceway surface 171a that inclines in a direction away from the outer raceway 106 from the inner peripheral edge toward the outer peripheral edge. The raceway surfaces 161 a and 171 a are conical and are in contact with the tapered rollers 122.

  The plurality of tapered rollers 122 are arranged in a state of being sandwiched between the outer raceway ring 106 and the inner raceway ring 107 at a predetermined interval over the entire circumference in the circumferential direction DR of the raceway rings 106 and 107. Yes. Each tapered roller 122 has a truncated cone shape whose diameter decreases from the outer peripheral edge toward the inner peripheral edge in the radial direction of the outer raceway ring 106. The tapered inclined surface of the tapered roller 122 matches the inclined angle of the tapered raceway surface 161 a of the outer raceway ring 106 and the tapered raceway surface 171 a of the inner raceway ring 107. Therefore, the tapered roller 122 abuts on the tapered raceway surface 161 a of the outer raceway ring 106 and abuts on the tapered raceway surface 171 a of the inner raceway ring 107.

  The cage 103 in the third embodiment has a truncated cone shape so as not to contact the tapered raceway surface 161a of the outer raceway ring 106 and the tapered raceway surface 171a of the inner raceway ring 107. It arrange | positions in the space between the surface 161a and the track surface 171a.

  The pocket 132 has a frustoconical inner peripheral shape that can accommodate the rollers 122 corresponding to the outer peripheral shape of the frustoconical roller 122. When the roller 122 is housed in the pocket 132, the roller 122 does not protrude from the outer open end 141 of the pocket 132 to the outside in the radial direction DD, or is substantially flush.

  The pockets 132 are opened at the thickness direction opening portions 143 and 143 on both sides of the cage 103 in the thickness direction DT. When the roller 122 is housed in the pocket 132, the roller 122 protrudes in the thickness direction DT of the cage 103 through the thickness direction opening portion 143 in the pocket 132.

  The pocket 132 restricts the roller 22 from coming off from the opening portion 143 in the thickness direction in the pocket 132. Specifically, as shown in FIGS. 10B and 12, the thickness direction opening portion 143 has a width larger than that of the frustoconical roller 122 when viewed in the direction in which the pocket 132 and the roller 122 extend (radial direction DD). Is also narrower. Therefore, the roller 122 does not come off from the opening portion 143 in the thickness direction in the pocket 132.

  The pocket 132 extends in the radial direction DD, opens at the outer open end 141 outside the radial direction DD, and has a bottom 142 on the inner side in the radial direction and is closed. Therefore, the roller 122 can be inserted into the pocket 132 via the outer open end 141 (only) toward the inside of the radial direction DD, and the roller 122 inserted into the pocket 132 can be inserted into the outer open end. It can be extracted towards the outside of the radial direction DD (only) via the part 141.

  According to the third embodiment, the same effects as those of the first embodiment are achieved. In the third embodiment, the roller 122 has a substantially conical shape constricted toward the inside of the radial direction DD of the roller 122. The rollers 122 are made of a fluororesin. Therefore, the peripheral speed difference of the roller 122 in the radial direction DD can be reduced, and slippage of the roller 122 can be reduced. As a result, various problems caused by the sliding of the rollers 122 (rotational resistance between the raceway surfaces 161a and 171a and 122 due to sliding friction increase, and wear of the rollers 122 and the raceway surfaces 161a and 171a increases on the outer peripheral side. Etc.) can be suppressed. Since the roller 122 is made of a fluororesin, it has various properties such as chemical resistance, electrical insulation, heat resistance, low friction (self-lubricating), and machinability.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIGS. 14A to 17. FIG. 14A is a front view showing the thrust roller bearing 201 according to the fourth embodiment of the present invention in a state where the bearing ring is omitted. FIG. 14B is a plan view of FIG. 14A. FIG. 15A is a view showing a state in which the rollers 222B are virtually taken out of the pocket 232B, and is a plan view showing the outer cage element 233B. FIG. 15B is a diagram showing a state in which the rollers 222A are virtually taken out of the pockets 232A, and is a plan view showing the inner cage element 233A. FIG. 16A is a sectional view showing the thrust roller bearing 201 according to the fourth embodiment of the present invention in a state including the race rings 206 and 207. FIG. 16B is a developed cross-sectional view of FIG. 16A. FIG. 17 is a cross-sectional view illustrating a state in which the race rings 206 and 207 and the rollers 222A and 222B are omitted from the state illustrated in FIG. 16A.

  The fourth embodiment will be described mainly with respect to differences from the third embodiment, and components similar to those in the third embodiment are denoted by +100. In the fourth embodiment, the description of the third embodiment and the description of the first embodiment are appropriately applied to points that are not particularly described. Also in the fourth embodiment, the same effects as in the third embodiment and the first embodiment are exhibited.

  A thrust roller bearing 201 according to the fourth embodiment is a thrust roller bearing that receives a thrust load and a radial load. As shown in FIGS. 14A to 17, the thrust roller bearing 201 includes a plurality of rollers 222 arranged radially on the raceway surfaces 261 a and 271 a. A roller group 202 configured, a cage 203 having a pocket 232 for storing the rollers 222 configuring the roller group 202, an outer race ring 206, and an inner race ring 207 are provided.

  In the fourth embodiment, as shown in FIGS. 14A, 14B, 16A, and 16B, the roller group 202 (202A, 202B) has a plurality of rows in the radial direction DD of the rollers 222 (in this embodiment, two rows). ) Arranged. The roller 222 as a rolling element is a “conical roller” having a substantially conical shape constricted toward the inside of the radial direction DD of the roller 222.

  As shown in FIGS. 16A and 16B, the outer raceway 206 has a raceway surface 261 a on the side that supports the rollers (conical rollers) 222, and the inner raceway 207 is supported by the rollers (cone rollers) 222. Side track surface 271a. The spacing between the raceway surfaces 261a and 271a is formed in a tapered shape corresponding to the substantially conical shape of the roller 222 so as to gradually decrease at the same rate from the outer peripheral side to the inner peripheral side in the radial direction DD. Yes.

  As shown in FIGS. 16A and 16B, the diameter of the outer end of each roller 222A in the inner roller group 202A in the radial direction DD is larger than the diameter of the inner end of each roller 222B in the outer roller group 202B in the radial direction DD. small. The thickness of the cage element 233A inside the radial direction DD is thinner than the thickness of the cage element 233B outside the radial direction DD.

  The pocket 232A of the inner cage element 233A is sized corresponding to the inner roller 222A. That is, the roller 222A does not protrude from the outer open end 241 of the pocket 232A to the outside in the radial direction DD or is substantially flush with the pocket 232A. When the roller 222A is housed in the pocket 232A, the roller 222A protrudes in the thickness direction DT of the cage element 233A rather than the inner cage element 233A via the thickness direction opening portion 243 in the pocket 232A. The pocket 232A restricts the roller 222A from coming off from the opening 243 in the thickness direction in the pocket 232A. Therefore, the roller 222A does not come out of the thickness direction opening portion 243 in the pocket 232A. The roller 222A can be inserted into the pocket 232A inward in the radial direction DD only through the outer open end 241. The roller 222A inserted into the pocket 232A can be inserted through the outer open end 241. Can be extracted toward the outside of the radial direction DD only.

  The pocket 232B of the outer cage element 233B is sized to correspond to the outer roller 222B. That is, the roller 222B does not protrude from the outer open end 241 of the pocket 232B to the outside in the radial direction DD or is substantially flush with the pocket 232B. When the roller 222B is housed in the pocket 232B, the roller 222B protrudes in the thickness direction DT of the cage element 233B from the outside cage element 233B via the thickness direction opening portion 243 in the pocket 232B. The pocket 232B restricts the roller 222B from coming off from the opening 243 in the thickness direction in the pocket 232B. Therefore, the roller 222B does not come out of the thickness direction opening portion 243 in the pocket 232B. The roller 222B can be inserted into the pocket 232B inward of the radial direction DD only through the outer open end 241. The roller 222B inserted into the pocket 232B can be inserted through the outer open end 241. Can be extracted toward the outside of the radial direction DD only.

  The number of rollers 222B constituting the outer roller group 202B in the radial direction DD (eight in the present embodiment) is the number of rollers 222A constituting the inner roller group 202A in the radial direction DD (6 in the present embodiment). More).

  As shown in FIG. 16A, the central axis of an arbitrary first roller 222Am of the inner roller group 202A in the radial direction DD and the central axis of an arbitrary second roller 222Bn of the outer roller group 202B in the radial direction DD. When these coincide, the first roller 222Am and the second roller 222Bn respectively constitute separate portions of the virtual substantially conical long roller 222C that connects the two.

  According to the fourth embodiment, the same effects as those of the third embodiment are achieved. According to 4th Embodiment, the effect similar to 1st Embodiment is also show | played. Further, according to the fourth embodiment, the length of the roller 222 can be shortened and the peripheral speed difference of the roller 222 in the radial direction DD can be reduced as compared with the case where a long roller is used in one row of rollers. The slip of the roller 222 can be reduced. As a result, various problems caused by the sliding of the rollers 222 (the rotational resistance between the raceways 261a and 271a and 222 due to sliding friction increases, and the wear of the rollers 222 and the raceways 261a and 271a increases on the outer peripheral side. Etc.) can be suppressed.

The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and can be implemented in various forms.
In the first embodiment and the second embodiment, the number of rows of the roller group 2 and the pocket group 31 may be three or more. In that case, it is preferable that the number of rollers 22 constituting the roller group 2 is increased for each cage element 33 adjacent to the radial direction DD. In the first embodiment and the second embodiment, the number of rows of the roller group 2 and the pocket group 31 may be one.

The number of rollers 22 constituting the roller group 2 is not limited. A plurality of rollers 22 can be accommodated in one pocket 32 side by side in the axial direction.
The diameter of the plurality of rollers 22 may be the same or different for each cage element 33 or in the cage 3 as a whole.
The structure of the pocket 32 is not limited to the structure of the pocket 32 in the embodiment. The pocket 32 may have a structure that restricts the roller 22 from coming off from the outer open end 41 in the radial direction DD in the pocket 32.

[First Modification]
A first modification will be described with reference to FIGS. 18A, 18B, and 19. FIG. FIG. 18A is a perspective view showing a first modified example, and shows an outer race 6A. FIG. 18B is a perspective view showing a first modification and shows an inner race 7A. FIG. 19 is a cross-sectional view showing a first modification, corresponding to FIG. 8B.
As shown in FIG. 18A, FIG. 14B and FIG. 19, in the first modification, the outer race 6A includes an annular raceway portion 61 on which a raceway surface 61a on which a plurality of rollers 22 roll, A short cylindrical outer peripheral wall portion 62 extending from the outer peripheral end perpendicular to the raceway surface 61a, and a cylindrical support peripheral wall portion 63 extending from the inner peripheral end of the raceway portion 61 perpendicular to the raceway surface 61a. And a first retaining engagement portion 64 integrally. The support peripheral wall 63 extends to the opposite side of the outer peripheral wall 62 with respect to the track 61. The first retaining engagement portion 64 is a concave portion that is recessed outward in the radial direction DD, and is annularly provided on the inner peripheral portion of the outer peripheral wall portion 62 so as to extend in the circumferential direction DR.

  The inner race 7A includes an annular raceway portion 71 on which a raceway surface 71a on which a plurality of rollers 22 roll, and a cylindrical inner portion extending perpendicularly to the raceway surface 71a from the inner peripheral end of the raceway portion 71. The peripheral wall 72A and the second retaining engagement portion 74 are integrally provided. The second retaining engagement portion 74 is a convex portion that protrudes outward in the radial direction DD, and is provided in an annular shape on the outer peripheral portion of the track portion 71 so as to extend in the circumferential direction DR.

  As shown in FIG. 19, in a state where the retainer 3 is disposed between the outer race 6A and the inner race 7A, the second retaining engagement portion 74 is disposed on the first retaining engagement portion 64, and The first retaining engagement portion 64 and the second retaining engagement portion 74 are engaged.

  In this state, the inner race 7A is prevented from coming off the outer race 6A. Further, since both the first retaining engagement portion 64 and the second retaining engagement portion 74 are annular extending in the circumferential direction DR, the rotation of the inner race 7A with respect to the outer race 6A is not substantially hindered. That is, according to such a configuration, it is possible to achieve both prevention of the inner race 7A from coming off the outer race 6A and smooth rotation of the inner race 7A with respect to the outer race 6A. Further, since the distance between the raceway surface 61a of the outer race 6A and the raceway surface 71a of the inner race 7A can be maintained, smooth rolling of the rollers 22 with respect to the outer race 6A and the inner race 7A can be realized.

  As shown in FIG. 19, the inner peripheral wall portion 72A of the inner race 7A is inserted into the support peripheral wall portion 63 of the outer race 6A. Therefore, the inner race 7A can smoothly rotate with respect to the outer race 6A.

[Second Modification]
A second modification will be described with reference to FIG. FIG. 20 is a plan view showing a second modification, corresponding to FIG. 1A.
As shown in FIG. 20, the roller group 2 is arranged in a row in the radial direction DD of the rollers 22. The retainer 3A includes an annular drop prevention member 36 on the outer peripheral portion thereof. The inner peripheral part of the slip-off preventing member 36 faces the outer open end 41 of the pocket 32 of the cage 3 </ b> A, and therefore functions as a stopper for the rollers 22 from coming off from the outer open end 41 of the pocket 32.
In addition, the omission prevention member 36 can also be provided in a mode in which the roller group 2 is arranged in a plurality of rows in the radial direction DD of the rollers 22 as shown in FIG.

  Each structure mentioned above or mentioned later can be combined suitably. For example, instead of the retainer 103 that holds the tapered roller 122 and the outer race ring 106 and the inner race ring 107 corresponding to the tapered roller 122 in the third embodiment, the first embodiment or the second embodiment is used. A configuration in which a plurality of rows of roller groups 2 including cylindrical rollers 22 are arranged in the radial direction DD can be combined. In that case, the outer raceway and the inner raceway are arranged in parallel so as to correspond to the outer peripheral surface of the cylindrical roller 22.

  The configurations of the first modification and the second modification can be applied to the third embodiment. For example, portions corresponding to the outer race ring 106 and the inner race ring 107 in the third embodiment can be provided in the housing and the shaft-like rotating member, respectively.

1, 1A, 101, 201 Thrust roller bearing 2, 2A, 2B, 102, 202, 202A, 202B Roller group 3, 103, 203 Cage 22, 22A, 22B, 122, 222, 222A, 222B Rollers 32, 32A, 32B, 132, 232, 232A, 232B Pockets 33, 33A, 33B, 233, 233A, 233B Cage elements 41, 141, 241 Outside open end (outside open end)
43, 143, 243 Thickness direction opening part (Thickness direction opening part)
61a, 71a, 161a, 171a, 261a, 271a Track surface DD Radial direction DT Thickness direction of cage

Claims (12)

A thrust roller bearing that receives at least a thrust load,
A roller group composed of a plurality of rollers arranged radially on the raceway surface, and a group of rollers arranged in a plurality of rows in the radial direction of the rollers;
A cage having a plurality of rows of pockets for storing the rollers constituting the roller group,
The number of the rollers constituting the roller group outside the radial direction is larger than the number of the rollers constituting the roller group inside the radial direction,
Thrust roller bearing. The cage is composed of a plurality of cage elements arranged in the radial direction,
The retainer element has a row of the pockets corresponding to a row of the group of rollers;
The thrust roller bearing according to claim 1. The plurality of cage elements can be connected or separated in the radial direction.
The thrust roller bearing according to claim 2. The plurality of retainer elements are not coupled in the radial direction;
The thrust roller bearing according to claim 2. The pockets extend in the radial direction, open to the outside in the radial direction and closed to the inside in the radial direction, and open in the thickness direction of the cage;
The roller protrudes in the thickness direction of the retainer rather than the retainer through the opening in the thickness direction of the retainer in the pocket in the state of being accommodated in the pocket,
The pocket restricts the roller from coming off from the opening in the thickness direction of the cage in the pocket,
The thrust roller bearing according to any one of claims 2 to 4. The radially outward open end of the pocket of the retainer element inside the radial direction is closed by the retainer element outside the radial direction, and the retainer inside the radial direction. The rollers housed in the pockets of the element are restricted from coming out of the radial direction,
The thrust roller bearing according to any one of claims 2 to 5. A thrust roller bearing that receives at least a thrust load,
A group of rollers composed of a plurality of rollers arranged radially on the raceway surface;
A cage having a pocket for storing the rollers constituting the roller group,
The pockets extend radially, open to the outside in the radial direction and closed to the inside in the radial direction, and open in the thickness direction of the cage;
The roller protrudes in the thickness direction of the retainer rather than the retainer through the opening in the thickness direction of the retainer in the pocket in the state of being accommodated in the pocket,
The pocket restricts the roller from coming off from the opening in the thickness direction of the cage in the pocket,
Thrust roller bearing. A thrust roller bearing is a thrust roller bearing that receives a thrust load and a radial load.
The raceway surface is conical,
The thrust roller bearing according to any one of claims 1 to 5. The roller has a substantially conical shape constricted toward the inner side in the radial direction of the roller,
The thrust roller bearing according to any one of claims 1 to 8. In the raceway surface, a separation interval between the raceway surface on the side supporting the roller and the raceway surface on the side supported by the roller is gradually reduced toward the inner side in the radial direction corresponding to the substantially conical shape of the roller. Formed into a tapered shape,
The diameter of the outer end of each roller of the roller group inside the radial direction is smaller than the diameter of the inner end of each roller of the roller group outside the radial direction,
The thickness of the cage element inside the radial direction is less than the thickness of the cage element outside the radial direction,
The thrust roller bearing according to claim 8 or 9. When the central axis of an arbitrary first roller of the roller group inside the radial direction coincides with the central axis of an arbitrary second roller of the roller group outside the radial direction, the first The roller and the second roller respectively constitute separate parts of a virtual substantially conical long roller that connects the two.
The thrust roller bearing according to claim 10. The roller and / or the cage is formed of a fluororesin,
The thrust roller bearing according to any one of claims 1 to 11.

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