TW201712240A - Thrust roller bearing - Google Patents

Abstract

This thrust roller bearing (1) which receives at least thrust load is provided with a roller group (2) including multiple rollers (22) arranged radially on a raceway surface, and arranged in multiple rows in a radial direction (DD) of the rollers (22), and a holder (3) that has a plurality of rows of pockets (32) which house therein the rollers (22) constituting the roller group (2). The number of rollers (22B) constituting a roller group (2B) at the outer side in the radial direction (DD) is greater than the number of rollers (22A) constituting a roller group (2A) at the inner side in the radial direction (DD).

Description

Thrust roller bearing

The present invention relates to a thrust roller bearing constructed by a plurality of rollers that are rotated on a raceway surface and held in a radial shape by a retainer.

The thrust roller bearing that receives the thrust load is provided with a plurality of rollers (rotating bodies) arranged in a radial shape, which are interposed between the non-rotating member and the rotating member, for example, in a transmission or a windmill device of the vehicle, in order to withstand rotation The axial thrust causes the rotating member to smoothly rotate while the user. The thrust roller bearing includes, for example, a plurality of rollers arranged radially on the raceway surface, and a retainer having a roller groove for accommodating the rollers (Patent Document 1).

Prior technical literature Patent literature

Patent Document 1 Japanese Patent Laid-Open Publication No. 2010-281406

In the thrust roller bearing, when used, a difference in circumferential speed (circumferential speed difference) occurs between the inner circumferential side and the outer circumferential side of the rail wheel, and therefore, there is a slippage between the rail wheel and the roller on the outer peripheral side. characteristic. If slippage occurs, the track wheel and roll will occur due to sliding friction. The rotational resistance between the columns is increased, or the wear of the roller or the orbital wheel on the outer peripheral side is increased.

SUMMARY OF THE INVENTION An object of the present invention is to provide a thrust roller bearing which can suppress various types of defects caused by roller slippage.

The present invention relates to a thrust roller bearing that is at least subjected to a thrust load, comprising: a roller group composed of a plurality of rollers radially arranged on a raceway surface, and a plurality of columns arranged in a radial direction of the roller; and maintaining a plurality of roller grooves for accommodating the rollers constituting the roller group, and the number of the rollers constituting the roller group outside the radiation direction is larger than the number of rollers constituting the inner side in the radiation direction The number of the aforementioned rollers of the group.

Further, the retainer is composed of a plurality of retainer assemblies arranged in the radiation direction, and the retainer assembly may have one row of the roller grooves corresponding to one row of the roller groups.

Furthermore, the plurality of retainer assemblies can also be freely coupled or separated in the aforementioned direction of radiation.

Furthermore, the plurality of retainer assemblies may not be coupled in the aforementioned radiation direction.

Further, the roller groove extends in the radiation direction, and has an open shape on the outer side in the radiation direction, and is closed inside the radiation direction, and is open in the thickness direction of the retainer. In a state in which the roller is accommodated in the roller groove, the roller protrudes in the thickness direction of the retainer through the opening portion of the roller groove in the thickness direction of the retainer, and the roller groove is also The roller can be restricted from coming out of the opening portion of the roller groove in the thickness direction of the retainer.

Further, in the roller groove of the holder assembly on the inner side in the radiation direction, the open end portion on the outer side in the radiation direction may be blocked by the holder assembly on the outer side in the radiation direction to restrict accommodation in the radiation The aforementioned roller of the aforementioned roller groove of the aforementioned retainer assembly in the direction of the direction is outwardly displaced toward the radiation direction.

The present invention relates to a thrust roller bearing that is at least subjected to a thrust load, comprising: a roller group composed of a plurality of rollers radially arranged on a raceway surface; and a retainer having a roller groove for accommodating the aforementioned roller The roller of the group, the roller groove extends in the radiation direction, and has an open shape on the outer side in the radiation direction, and is closed inside the radiation direction, and the roller groove is toward the retainer. In a state in which the thickness direction is open, the roller is protruded in the thickness direction of the retainer through the retainer thickness direction opening portion of the roller groove in a state in which the roller is accommodated in the roller groove. The roller groove can restrict the roller from coming out of the opening portion of the roller groove in the thickness direction of the retainer.

Furthermore, the thrust roller bearing is a thrust roller bearing that is subjected to a thrust load and a radial load, and the raceway surface may have a conical shape.

Further, the roller may have a substantially conical shape that is narrowed toward the inner side in the radiation direction of the roller.

Further, the roller and/or the holder may be formed of a fluororesin.

According to the present invention, a thrust roller bearing capable of suppressing various defects caused by roller slip can be provided.

1, 1A, 101, 201‧‧‧ thrust roller bearings

2, 2A, 2B, 102, 202, 202A, 202B‧‧‧ roller group

3, 103, 203‧‧‧ retainers

22, 22A, 22B, 122, 222, 222A, 222B‧‧ ‧ rollers

32, 32A, 32B, 132, 232, 232A, 232B‧‧‧roller slots

33, 33A, 33B, 233, 233A, 233B‧‧‧ keeper assembly

41, 141, 241‧‧‧ outside open end (outer open end)

43, 143, 243 ‧ ‧ thickness opening section (opening section in thickness direction)

61a, 71a, 161a, 171a, 261a, 271a‧‧‧ track surface

DD‧‧‧radiation direction

Thickness direction of DT‧‧‧ retainer

Fig. 1A is a plan view showing a thrust roller bearing 1 according to a first embodiment of the present invention in a state in which a rail wheel is omitted.

Figure 1B is a bottom view of Figure 1A.

2A is a front view of FIG. 1A.

Fig. 2B is a cross-sectional view taken along line A-B-C of Fig. 1A.

FIG. 3A is a top plan view of the inner retainer assembly 33A.

Fig. 3B is a front view of Fig. 3A.

Fig. 3C is a diagram for changing the direction of Fig. 3B.

Fig. 4A is a view showing a state in which the roller 22A is taken out from the roller groove 32A, and corresponds to Fig. 3A.

Fig. 4B is a view showing a state in which the roller 22A is taken out from the roller groove 32A, and corresponds to Fig. 3C.

FIG. 5A is a bottom view of the outer retainer assembly 33B.

Figure 5B is a front view of Figure 5A.

Fig. 5C is a diagram for changing the direction of Fig. 5B.

Fig. 6A is a view showing a state in which the roller 22B is taken out from the roller groove 32B, and corresponds to Fig. 5A.

Fig. 6B is a view showing a state in which the roller 22B is taken out from the roller groove 32B, and corresponds to Fig. 5C.

Figure 7A is an exploded cross-sectional view of Figure 2B showing an illustration of the outer retainer assembly 33B.

Figure 7B is an exploded cross-sectional view of Figure 2B showing an illustration of the inner retainer assembly 33A.

FIG. 8A is a view showing the thrust roller bearing 1 according to the first embodiment of the present invention in a state including the rail wheels 6, 7, and corresponds to the corresponding diagram of FIG. 2A.

8B is a view showing the thrust roller bearing 1 according to the first embodiment of the present invention in a state including the rail wheels 6, 7, and corresponds to the corresponding diagram of FIG. 2B.

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 rail wheel is omitted.

Fig. 10A is a front elevational view showing the thrust roller bearing 101 according to the third embodiment of the present invention in a state in which the rail wheel is omitted.

Figure 10B is a plan view of Figure 10A.

Fig. 11 is a view showing a state in which the roller 122 is taken out from the roller groove 132, and corresponds to Fig. 10B.

Fig. 12 is a cross-sectional view showing the thrust roller bearing 101 according to the third embodiment of the present invention in a state including the rail wheels 106 and 107.

Fig. 13 is a cross-sectional view showing a state in which the rail wheels 106, 107 and the rollers 122 are omitted from the state shown in Fig. 12.

Fig. 14A is a front elevational view showing the thrust roller bearing 201 according to the fourth embodiment of the present invention in a state in which the rail wheel is omitted.

Figure 14B is a plan view of Figure 14A.

Fig. 15A is a view showing a state in which the roller 222B is taken out from the roller groove 232B, and is a plan view of the outer holder assembly 233B.

Fig. 15B is a view showing a state in which the roller 222A is taken out from the roller groove 232A, and is a plan view of the inner holder assembly 233A.

Fig. 16A is a cross-sectional view showing the thrust roller bearing 201 according to the fourth embodiment of the present invention in a state including the rail wheels 206 and 207.

Figure 16B is an expanded cross-sectional view of Figure 16A.

Fig. 17 is a cross-sectional view showing a state in which the rail wheels 206 and 207 and the rollers 222A and 222B are omitted from the state shown in Fig. 16B.

Fig. 18A is a perspective view showing a first modification, showing the outer race 6A.

Fig. 18B is a perspective view showing a first modification, showing the inner race 7A.

Fig. 19 is a cross-sectional view showing a first modification and belonging to the corresponding diagram of Fig. 8B.

Fig. 20 is a plan view showing a second modification, and corresponds to the corresponding diagram of Fig. 1A.

[Embodiment of the Invention] [First Embodiment]

The thrust roller bearing 1 according to the 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 the rail wheels are omitted. Figure 1B is a bottom view of Figure 1A. 2A is a front view of FIG. 1A. Fig. 2B is a cross-sectional view taken along line A-B-C of Fig. 1A. FIG. 3A is a top plan view of the inner retainer assembly 33A. Fig. 3B is a front view of Fig. 3A. Fig. 3C is a diagram for changing the direction of Fig. 3B. Fig. 4A shows a state in which the roller 22A is taken out from the roller pocket 32A, and corresponds to the corresponding diagram of Fig. 3A. Fig. 4B shows a state in which the roller 22A is taken out from the roller groove 32A, and corresponds to the corresponding diagram of Fig. 3C. FIG. 5A is a bottom view of the outer retainer assembly 33B. Figure 5B is a diagram Front view of the 5A. Fig. 5C is a diagram for changing the direction of Fig. 5B. Fig. 6A shows a state in which the roller 22B is taken out from the roller groove 32B, and corresponds to the corresponding diagram of Fig. 5A. Fig. 6B is a view showing a state in which the roller 22B is taken out from the roller groove 32B, and corresponds to Fig. 5C. Fig. 7A is an exploded cross-sectional view of Fig. 2B, showing a view showing the outer holder assembly 33B. Fig. 7B is an exploded cross-sectional view of Fig. 2B, showing a view showing the inner holder assembly 33A. Fig. 8A shows the thrust roller bearing 1 according to the first embodiment of the present invention in a state including the rail wheels 6, 7, and corresponds to the corresponding diagram of Fig. 2A. Fig. 8B shows the thrust roller bearing 1 according to the first embodiment of the present invention in a state including the rail wheels 6, 7, and corresponds to the corresponding diagram of Fig. 2B.

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

As shown in FIGS. 8A and 8B, the retainer 3 is disposed between the outer race 6 and the inner race 7. As shown in FIGS. 1A to 6B, a plurality of rollers 22 constituting the roller group 2 are rotatably held in the roller grooves 32 formed in the holder 3.

The thrust roller bearing 1 is used, for example, in a transmission or a windmill device of a vehicle, as shown in FIGS. 8A and 8B, and is disposed on a shaft-shaped rotating member 75 with a stepped step on the inner circumferential side of the inner race 7 and Facing between the housings 65 of the outer race 6. By the rotation of the plurality of rollers 22 held by the holder 3, the thrust roller bearing 1 can smoothly support the rotation of the rotating member 75 while receiving the axial thrust of the rotating member 75.

The outer race 6 has an annular rail portion 61 formed with a raceway surface 61a for rotating a plurality of rollers 22, and a short cylindrical outer peripheral wall portion 62 from the outer peripheral end of the rail portion 61 and the rail. The faces 61a extend in an orthogonal manner. The raceway surface 61a is located 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 rail portion 71 integrally formed with a raceway surface 71a for rotating a plurality of rollers 22, and a short cylindrical inner peripheral wall portion 72 orthogonal to the raceway surface 71a. It extends from the inner peripheral end of the rail portion 71. The raceway surface 71a is opposed to each other so as to be parallel to the raceway surface 61a of the outer race 6.

The shaft-shaped rotating member 75 having a step is pushed in by the step portion 71 and the inner peripheral wall portion 72 of the inner race 7 so as to straddle the step portion.

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

The retainer 3 is in the shape of a circular plate from a plan view. The outer peripheral wall portion 62 of the outer race 6 is slightly larger than the outer circumference of the retainer 3. Therefore, the holder 3 disposed on the rail portion 61 of the outer race 6 can smoothly rotate inside the outer peripheral wall portion 62.

The holder 3 has a plurality of rows of roller grooves 31 for accommodating the rollers 22 constituting the roller group 2. The roller groove group 31 is composed of a plurality of roller grooves 32 which are arranged at intervals in the circumferential direction DR. The roller groove group 31 (31A, 31B) has a plurality of columns arranged in the radiation direction DD of the roller 22. (In the present embodiment, it is two columns). The roller grooves 32 are rotatably held in a plurality of rollers 22 arranged in a radial shape, and are provided in the same number as the plurality of rollers 22 in a radial shape.

The holder 3 is constituted by a plurality of holder assemblies 33 arranged in the radiation direction DD. In the present embodiment, the retainer 3 is the (first) retainer assembly 33A (see FIG. 3A, FIG. 4A) inside the radiation direction DD, and the (second) retainer assembly 33B outside the radiation direction DD. 5A and 6A). The holder assembly 33 (33A, 33B) has a row of roller groove groups 31 (roller grooves 32) corresponding to one row of roller groups 2, respectively. Specifically, the inner first retainer unit 33A has an inner roller groove group 31A (roller groove 32A) corresponding to the inner first roller group 2A. The outer second retainer unit 33B has an outer roller groove group 31B (roller groove 32B) corresponding to the outer second roller group 2B.

The roller groove 32 has a cylindrical inner circumferential shape that can accommodate the roller 22 in accordance with the outer circumferential shape of the cylindrical roller 22 . In each of the holder assemblies 33, the roller grooves 32 extend in the radiation direction DD, and the outer open end portions 41 outside the radiation direction DD are open. The roller groove 32 has a bottom portion 42 inside the radiation direction DD and is closed. In each of the holder assemblies 33, the rollers 22 are not housed in the outer side of the outer open end portion 41 of the roller groove 32 in the radiation direction DD, or substantially in the same plane, in a state of being accommodated in the roller groove 32.

On both sides of the thickness direction DT of the retainer 3, the roller grooves 32 are open in the thickness direction opening portions 43, 43. In a state in which the roller 22 is housed in the roller groove 32, the roller 22 protrudes in the thickness direction of the retainer 3 from the retainer 3 via the thickness direction opening portion 43 of the roller groove 32.

The roller groove 32 restricts the roller 22 from coming out of the opening portion 43 in the thickness direction of the roller groove 32. Specifically, as shown in FIG. 3C and FIG. 5C, when the roller groove 32 and the roller 22 are viewed from the extending direction (radiation direction DD), the thickness direction opening portion 43 is larger than the width (diameter) of the cylindrical roller 22. narrow. Therefore, the roller 22 does not come out from the opening portion 43 in the thickness direction of the roller groove 32.

Further, as described above, in each of the holder assemblies 33, the roller groove 32 has an open outer end portion 41 which is outside the radiation direction DD, and has a bottom portion 42 in the radiation direction and is closed. Therefore, in each of the holder assemblies 33, the roller 22 (only) can be inserted into the roller groove 32 via the outer open end portion 41 toward the inner side in the radiation direction DD, and the roller 22 inserted into the roller groove 32 can be (only) The outer open end portion 41 is detached toward the outer side in the radiation direction DD.

A plurality of holder assemblies 33 adjacent to the radiation direction DD are freely coupled or separated in the radiation direction DD by the joint fastening portions 35. In the present embodiment, the connection engagement portion 35 includes the first engagement portion 35A and the second engagement portion 35B. The outer peripheral portion of the inner (first) retainer unit 33A is provided with a plurality of first engaging portions 35A apart in the circumferential direction DR. The inner peripheral portion of the (second) holder assembly 33B outside the radiation direction DD is provided with a plurality of second engaging portions 35B separately in the circumferential direction DR. The first engaging portion 35A and the second engaging portion 35B are disposed at positions that can be engaged with each other, and can be engaged with each other. The inner (first) retainer unit 33A is connectable to the outer (second) retainer unit 33B in a state in which the first engaging portion 35A and the second engaging portion 35B are engaged with each other.

In a state in which the holder assembly 33 (33A, 33B) adjacent to the radiation direction DD is joined, the open end portion 41 outside the radiation direction DD in the roller groove 32A of the holder assembly 33A inside the radiation direction DD is radiated. The inner peripheral portion of the retainer assembly 33B outside the direction DD is sealed. By this means, the roller 22 of the roller groove 32A of the holder assembly 33A accommodated inside the radiation direction DD is restricted from coming out to the outside in the radiation direction DD.

The number of rollers 22B (12 in the present embodiment) constituting the roller group 2B outside the radiation direction DD is larger than the number of rollers 22A constituting the roller group 2A inside the radiation direction DD (in the present embodiment) 8 in the middle). In the holder assembly 33 adjacent to the radiation direction DD, the difference in the number of the rollers 22 constituting the roller group 2 is, for example, 2 to 10, preferably 3 to 8.

In the present embodiment, the roller 22, the retainer 3, the outer race 6, and the inner race 7 are formed of a fluororesin. The fluororesin may, for example, be PTFE, PFA or FEP. The fluororesin is excellent in various properties such as chemical resistance, electrical insulation, heat resistance, low friction (self-lubricating property), and machinability, and is suitable as a thrust bearing as compared with metal or general resin. Roller, etc. Further, the resin forming the roller or the like may be a resin other than the fluororesin. Further, the roller or the like can also be formed using a metal.

According to the thrust roller bearing 1 of the first embodiment, for example, the following effects can be achieved.

The thrust roller bearing 1 of the first embodiment includes a roller group 2 composed of a plurality of rollers 22 radially arranged on the raceway surfaces 61a and 71a, and a plurality of rows arranged in the radiation direction DD of the rollers 22; 3, There are a plurality of rows of roller grooves 32 for accommodating the rollers 22 constituting the roller group 2. Further, the number of rollers 22B constituting the roller group 2B outside the radiation direction DD is larger than the number of rollers 22A constituting the roller group 2A inside the radiation direction DD.

Therefore, according to the first embodiment, the length of the roller 22 can be shortened and the circumferential speed difference of the roller 22 in the radiation direction DD can be reduced as compared with the case where the long roller is used in the one-row roller group. The slip of the roller 22 can be reduced. As a result, various kinds of defects caused by the slip of the roller 22 can be suppressed (the rotational resistance between the raceway surfaces 61a, 71a and the roller 22 is increased by the sliding friction, or the roller 22 or the raceway surfaces 61a, 71a are on the outer peripheral side. Increase in wear and tear, etc.).

Further, in each of the roller groups 2, the rollers 22 in the circumferential direction DR can be made uniform in interval, and the load on one roller 22 can be made uniform. Therefore, deformation of the roller 22 due to load concentration can be suppressed.

In the first embodiment, the retainer 3 is constituted by a plurality of retainer assemblies 33 that can be freely coupled or separated in the radiation direction DD. The holder assembly 33 has a row of roller grooves 32 corresponding to one row of roller groups 2.

Therefore, according to the first embodiment, by connecting the holder unit 33 having one row of the roller grooves 32 corresponding to the row of the roller groups 2, it is possible to easily form the plural column in which the plurality of column groups 2 are accommodated. Roller groove group 31.

In the first embodiment, among the respective holder assemblies 33, the roller grooves 32 extend in the radiation direction DD, are open to the outside in the radiation direction DD, and are closed inside the radiation direction DD, and toward the thickness direction of the holder 3. DT is open. The state in which the roller 22 is housed in the roller groove 32 Next, the roller 22 protrudes from the opening portion 43 in the thickness direction DT of the retainer 3 of the roller groove 32 toward the holder 3 in the thickness direction DT of the retainer 3. The roller groove 32 restricts the roller 22 from coming out of the opening portion 43 in the thickness direction DT of the holder 3 of the roller groove 32.

Therefore, according to the first embodiment, the holder 3 (holder assembly 33) having the roller grooves 32 can be easily formed by cutting (for example, end milling or injection molding).

In the first embodiment, in a state in which the holder assembly 33 adjacent to the radiation direction DD is connected, the open end portion 41 outside the radiation direction DD of the roller groove 32 of the holder assembly 33 inside the radiation direction DD is The radiation direction DD outer holder assembly 33 is closed, and the roller 22 of the roller groove 32 of the holder assembly 33 accommodated inside the radiation direction DD is restricted from being displaced outward in the radiation direction DD.

Therefore, according to the first embodiment, it is not necessary to separately provide a configuration for closing the open end portion 41 of the roller groove 32A of the retainer assembly 33A inside the radiation direction DD, as long as the adjacent retainer assembly 33A, When the 33B is connected, the open end portion 41 of the roller groove 32 can be closed.

In the first embodiment, the roller 22 and the holder 3 are formed of a fluororesin. In particular, the roller 22, the retainer 3, the outer race 6 and the inner race 7 are formed of a fluororesin.

Therefore, according to the first embodiment, the rotation of the roller 22 with respect to the retainer 3 or the rotation of the roller 22 with respect to the outer race 6 and the inner race 7 can be smoothly performed. Compared with a metal roller or the like, since it does not rust in a rotating portion, it is provided in a thrust roller bearing such as a very useful device, and is used in an emergency even when it is left unused for a long time. 22 can also smoothly rotate.

[Second Embodiment]

Next, the thrust roller bearing 1A of the second embodiment will be described with reference to Fig. 9 . 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 rail wheel is omitted. In the second embodiment, a portion different from the first embodiment will be mainly described as a main axis. In the second embodiment, the description of the first embodiment can be applied to a portion that is not particularly described. Further, in the second embodiment, the same effects as those of the first embodiment can be achieved.

Compared with the thrust roller bearing 1 of the first embodiment, the thrust roller bearing 1A of the second embodiment does not include a connection and fastening for connecting a plurality of retainer assemblies 33 (33A, 33B) adjacent to the radiation direction DD. Part 35. That is, the plurality of holder assemblies 33 (33A, 33B) are not connected. Therefore, the (first) holder assembly 33A inside the radiation direction DD and the (second) holder assembly 33B outside the radiation direction DD are independent, and can be rotated at different rotation speeds (number of rotations). The other configuration of the second embodiment is the same as that of the first embodiment. Therefore, according to the thrust roller bearing 1A of the second embodiment, the (second) holder assembly 33B outside the radiation direction DD can be rotated at a faster peripheral speed than the (first) holder assembly 33A inside the radiation direction DD.

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 portion 41 of the roller groove 32A of the retainer assembly 33A inside the radiation direction DD is The radiation direction DD outer holder assembly 33B is closed, so that the roller 22A of the roller groove 32A accommodated in the radiation direction DD inner holder assembly 33A is restricted from coming out to the outside in the radiation direction DD.

According to the thrust roller bearing 1A of the second embodiment, the same effects as those of the thrust roller bearing 1 of the first embodiment can be achieved. Moreover, since the circumferential rate of the (second) holder assembly 33B outside the radiation direction DD is larger (faster) than the circumferential rate of the (first) holder assembly 33A inside the radiation direction DD, the torque of the rotational motion can be made Loss load is 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 the thrust roller bearing 101 according to the third embodiment of the present invention in a state in which the rail wheel is omitted. Fig. 10B is a plan view of Fig. 10A. Fig. 11 is a view showing a state in which the roller 122 is taken out from the roller groove 132, and corresponds to the corresponding diagram of Fig. 10B. Fig. 12 is a cross-sectional view showing the thrust roller bearing 101 according to the third embodiment of the present invention in a state including the rail wheels 106 and 107. Fig. 13 is a cross-sectional view showing a state in which the rail wheels 106, 107 and the rollers 122 are omitted from the state shown in Fig. 12.

In the third embodiment, a portion different from the first embodiment will be mainly described as a main axis, and a configuration similar to that of the first embodiment will be denoted by a symbol +100. In the third embodiment, the description of the first embodiment is applied to portions that are not particularly described. Further, in the third embodiment, the same effects as those of the first embodiment can be achieved.

The thrust roller bearing 101 according to 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 roller group 102 that is radially arranged on the raceway surface 161a. The plurality of rollers 122 of the 171a are configured; the retainer 103 has a roller groove 132 for accommodating the rollers 122 constituting the roller group 102; the outer rail wheel 106; and the inner rail wheel 107.

In the third embodiment, as shown in FIGS. 10A to 13, the roller 122 as a rotating body is a substantially conical "tapered roller" having a narrowed inner side in the radiation direction DD of the roller 122. Specifically, as shown in FIG. 12, between the raceway surface 161a of the outer rail wheel 106 and the raceway surface 171a of the inner rail wheel 107, a truncated cone whose diameter is reduced from the outer peripheral side to the inner peripheral side in the radiation direction DD is shown. Shaped "tapered roller". The outer rail wheel 106 and the inner rail wheel 107 have tapered surfaces corresponding to the inclined surfaces of the tapered rollers 122, respectively.

The outer rail wheel 106 and the inner rail wheel 107 are disposed in the axial direction DJ in a coaxial and opposed state at a predetermined interval. The outer rail wheel 106 and the inner rail wheel 107 are disposed to be rotatable relative to each other about the rotatable shaft J1. A tapered roller 122 is disposed between the outer rail wheel 106 and the inner rail wheel 107 at a constant interval in the circumferential direction DR. The plurality of tapered rollers 122 are supported by the truncated cone-shaped holder 103 having the bottom opening so as to be freely rotatable about the central axis of the tapered roller 122. The spacing of the tapered rollers 122 adjacent in the circumferential direction is kept constant.

As shown in FIG. 12, the interval in which the outer rail wheel 106 and the inner rail wheel 107 are separated from each other is a taper shape which is gradually reduced in the same ratio from the outer peripheral side to the inner peripheral side. That is, the outer rail wheel 106 has a tapered raceway surface 161a that is inclined in a direction away from the inner rail wheel 107 from the inner peripheral edge end to the outer peripheral end. On the other hand, the inner rail wheel 107 has a tapered raceway surface 171a which is inclined in a direction away from the outer rail wheel 106 from the inner peripheral edge to the outer peripheral end. The raceway surfaces 161a and 171a have a conical shape and are in a state of abutting against the tapered roller 122.

The tapered roller 122 is sandwiched by the outer rail wheel 106 and the inner rail wheel 107, and a plurality of the tapered rollers 122 are disposed at regular intervals around the circumferential direction DR of the rail wheels 106 and 107. Further, each of the tapered rollers 122 has a truncated cone shape which is reduced in diameter from the outer peripheral edge toward the inner peripheral end in the radial direction of the outer rail wheel 106. The push-like inclined surface of the tapered roller 122 coincides with the inclined angle of the push-out track surface 161a of the outer rail wheel 106 and the push-out rail surface 171a of the inner rail wheel 107. Therefore, the tapered roller 122 abuts against the push-shaped rail surface 161a of the outer rail wheel 106, and abuts against the inner rail wheel 107 push-pull rail surface 171a.

The retainer 103 of the third embodiment has a truncated cone shape that does not contact the push-pull raceway surface 161a of the outer rail wheel 106 and the push-out rail surface 171a of the inner rail wheel 107, and is disposed on the raceway surface 161a and the raceway surface 171a. The space between.

The roller groove 132 has a truncated cone-shaped inner circumferential shape that can accommodate the roller 122 in correspondence with the outer peripheral shape of the truncated cone roller 122. In a state of being accommodated in the roller groove 132, the roller 122 does not protrude from the outer open end portion 141 of the roller groove 132 to the outside in the radiation direction DD, or substantially maintains the same plane.

The roller grooves 132 are formed on both sides in the thickness direction DT of the holder 103, and open in the thickness direction opening portions 143 and 143. In a state in which the roller 122 is housed in the roller groove 132, the roller 122 protrudes in the thickness direction DT of the retainer 103 from the retainer 103 via the thickness direction opening portion 143 of the roller groove 132.

The roller groove 132 restricts the roller 22 from coming out of the opening portion 143 in the thickness direction of the roller groove 132. Specifically, as shown in FIG. 10B and FIG. 12, when viewed from the direction in which the roller grooves 132 and the rollers 122 extend (radiation direction DD), the opening direction of the thickness direction opening portion 143 is smaller than that of the truncated cone shape. The width of the post 122 is also narrow. Therefore, there is no possibility that the roller 122 is detached from the opening portion 143 in the thickness direction of the roller groove 132.

Further, the roller groove 132 extends in the radiation direction DD, and the outer open end portion 141 outside the radiation direction DD has an open shape, and has a bottom portion 142 on the inner side in the radiation direction, and is in a closed state. Therefore, the roller 122 (only) can be inserted into the roller groove 132 via the outer open end portion 141 toward the inner side of the radiation direction DD, and the roller 122 inserted into the roller groove 132 can also (only) be openable via the outer open end portion 141 The radiation direction DD is pulled out on the outside.

According to the third embodiment, the same effects as those of the first embodiment can be achieved. Further, in the third embodiment, the roller 122 has a substantially conical shape that is narrowed toward the inner side in the radiation direction DD of the roller 122. Further, the roller 122 is formed of a fluororesin. Therefore, the circumferential speed difference of the rollers 122 in the radiation direction DD can be reduced, and the slip of the rollers 122 can be reduced. As a result, various defects caused by the slip of the roller 122 are suppressed (the rotational resistance between the raceway surfaces 161a, 171a and the roller 122 is increased by the sliding friction, or the roller 122 or the raceway surfaces 161a, 171a are on the outer peripheral side. Increased wear, etc.). Since the roller 122 is formed of a fluororesin, it is excellent in various properties such as chemical resistance, electrical insulation, heat resistance, low friction (self-lubricating property), 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 in which the rail wheel is omitted. Fig. 14B is a plan view of Fig. 14A. FIG. 15A is a view showing a state in which the roller 222B is disengaged from the roller groove 232B, and is a plan view of the outer holder assembly 233B. 15B is a diagram showing a state in which the roller 222A is disengaged from the roller groove 232A, and is a plan view of the inner holder assembly 233A. Fig. 16A is a cross-sectional view showing the thrust roller bearing 201 according to the fourth embodiment of the present invention in a state including the rail wheels 206 and 207. Figure 16B is an expanded cross-sectional view of Figure 16A. Fig. 17 is a cross-sectional view showing a state in which the rail wheels 206 and 207 and the rollers 222A and 222B are omitted from the state shown in Fig. 16A.

In the fourth embodiment, the difference from the third embodiment will be mainly described as a main axis, and the same configuration as that of the third embodiment will be denoted by reference numeral +100. The description of the third embodiment and the related description of the first embodiment are applied to the portions which are not particularly described in the fourth embodiment. Further, in the fourth embodiment, the same effects as those of the third embodiment and the first embodiment can be achieved.

The thrust roller bearing 201 of 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 that are radially arranged on the raceway surfaces 261a and 271a. A roller group 202 composed of a column 222, a holder 203 having a roller groove 232, an outer rail wheel 206, and an inner rail wheel 207 for accommodating the rollers 222 constituting the roller group 202.

In the fourth embodiment, as shown in Figs. 14A, 14B, 16A, and 16B, a plurality of rows of roller groups 202 (202A, 202B) are arranged in the radiation direction DD of the roller 222 (in the present embodiment, 2 columns). The roller 222 as a rotor has a substantially conical "tapered roller" that is narrowed toward the inside of the radiation direction DD of the roller 222.

As shown in FIGS. 16A and 16B, the outer rail wheel 206 has a rail surface 261a on the side supporting the roller (taper roller) 222, and the inner rail wheel 207 has a side supported by a roller (taper roller) 222. Track surface 271a. The interval between the raceway surfaces 261a and 271a corresponds to the substantially conical shape of the roller 222, and a push-down shape that is gradually reduced in the same ratio is formed from the outer peripheral side toward the inner peripheral side from the radiation direction DD.

As shown in FIGS. 16A and 16B, the diameter of the outer end of each of the rollers 222A of the roller group 202A inside the radiation direction DD is smaller than the diameter of the inner end of each of the rollers 222B of the roller group 202B outside the radiation direction DD. The thickness of the inner retainer assembly 233A in the radiation direction DD is then thinner than the thickness of the outer retainer assembly 233B in the radial direction DD.

The size of the roller groove 232A of the inner holder assembly 233A corresponds to the inner roller 222A. That is, in a state in which the roller 222A is housed in the roller groove 232A, the roller 222A does not protrude from the outer open end portion 241 of the roller groove 232A toward the outside in the radiation direction DD, or substantially remains on the same plane. In a state in which the roller 222A is housed in the roller groove 232A, the roller 222A protrudes in the thickness direction DT of the holder assembly 233A from the inner holder assembly 233A via the thickness direction opening portion 243 of the roller groove 232A. Therefore, the roller groove 232A restricts the roller 222A from coming out of the opening portion 243 in the thickness direction of the roller groove 232A. Therefore, there is no possibility that the roller 222A is detached from the thickness direction opening portion 243 of the roller groove 232A. The roller 222A can be inserted into the roller groove 232A only via the outer open end portion 241 toward the inner side in the radiation direction DD, and the roller 222A inserted into the roller groove 232A can only be pulled out to the outside in the radiation direction DD via the outer open end portion 241.

The size of the roller groove 232B of the outer holder assembly 233B corresponds to the outer roller 222B. That is, in a state in which the roller 222B is housed in the roller groove 232B, the roller 222B does not protrude from the outer open end portion 241 of the roller groove 232B to the outside in the radiation direction DD, or substantially maintains the same plane. In a state in which the roller 222B is housed in the roller groove 232B, the roller 222B protrudes in the thickness direction DT of the holder assembly 233B from the outer holder assembly 233B via the thickness direction opening portion 243 of the roller groove 232B. The roller groove 232B restricts the roller 222B from coming out of the opening portion 243 in the thickness direction of the roller groove 232B. Therefore, there is no possibility that the roller 222B is detached from the opening portion 243 in the thickness direction of the roller groove 232B. The roller 222B can only be inserted into the roller groove 232B through the outer open end portion 241 toward the inner side in the radiation direction DD, and the roller 222B inserted into the roller groove 232B can only be pulled out to the outside of the radiation direction DD via the outer open end portion 241. .

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

As shown in FIG. 16A, the central axis of the first roller 222Am of the roller group 202A inside the radiation direction DD and the radiation direction DD When the central axes of the arbitrary second rollers 222Bn of the outer roller group 202B match, the first roller 222Am and the second roller 222Bn constitute each of the virtual substantially conical long rollers 222C that are connected by the two. section.

According to the fourth embodiment, the same effects as those of the third embodiment can be obtained. According to the fourth embodiment, the same effects as those of the first embodiment can be achieved. Further, according to the fourth embodiment, the length of the roller 222 can be shortened as compared with the case where the long roller is used in the one-row roller group, and the circumferential speed difference of the roller 222 in the radiation direction DD can be reduced, and The slip of the roller 222 can be reduced. As a result, various kinds of defects caused by the slip of the roller 222 can be suppressed (the rotational resistance between the raceway surfaces 261a, 271a and the roller 222 is increased by the sliding friction, and the wear of the outer peripheral roller 222 or the raceway surfaces 261a, 271a is increased. Wait).

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 roller groove group 31 may be three or more. In this case, it is preferable that the number of the rollers 22 constituting the roller group 2 is increased in each of the holder assemblies 33 adjacent to the radiation direction DD. The number of rows of the roller group 2 and the roller groove group 31 of the first embodiment and the second embodiment may be one column.

The number of the rollers 22 constituting the roller group 2 is not limited. A plurality of rollers 22 can be accommodated in the axial direction in one of the roller grooves 32.

The diameter of the plurality of rollers 22 may be the same or different in each of the holder assembly 33 or the holder 3.

The structure of the roller groove 32 is also not limited to the structure of the roller groove 32 in the above embodiment. The roller groove 32 may have a structure that restricts the roller 22 from coming off the outer open end portion 41 of the roller groove 32 in the radiation direction DD.

[First Modification]

The first modification will be described with reference to Figs. 18A, 18B and 19. Fig. 18A is a perspective view showing a first modification, showing the outer race 6A. Fig. 18B is a perspective view showing a first modification, showing the inner race 7A. Fig. 19 is a cross-sectional view showing a first modification and pertaining to the corresponding diagram of Fig. 8B.

As shown in FIG. 18A, FIG. 14B and FIG. 19, in the first modification, the outer race 6A is integrally provided with an annular rail portion 61, and a raceway surface 61a for rotating a plurality of rollers 22 is formed; The cylindrical outer peripheral wall portion 62 extends from the outer peripheral end of the rail portion 61 orthogonally to the raceway surface 61a; the cylindrical support peripheral wall portion 63 extends from the inner peripheral end of the rail portion 61 orthogonally to the raceway surface 61a; 1 The snap-off portion 64 is closed. The support peripheral wall portion 63 extends on the opposite side of the outer peripheral wall portion 62 with respect to the rail portion 61. The first retaining engagement portion 64 is a recess that is recessed outward in the radiation 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 is integrally provided with an annular rail portion 71 formed with a raceway surface 71a for rotating a plurality of rollers 22, and a cylindrical inner peripheral wall portion 72A orthogonal to the rail portion 71a from the rail portion 71. The inner peripheral end extends; and the second retaining engagement portion 74. The second retaining engagement portion 74 is a convex portion that protrudes outward in the radiation direction DD, and is provided in an annular shape on the outer peripheral portion of the rail portion 71 so as to extend in the circumferential direction DR.

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

In this state, the inner race 7A can be prevented from coming off the outer race 6A. Further, since the first retaining engagement portion 64 and the second retaining engagement portion 74 are both annularly extending in the circumferential direction DR, the inner race 7A is not substantially hindered from the rotation of the outer race 6A. . That is, according to this configuration, it is possible to prevent the inner race 7A from coming off the outer race 6A and the inner race 7A from rotating smoothly with respect to the outer race 6A. Further, since the interval between the raceway surface 61a of the outer race 6A and the raceway surface 71a of the inner race 7A is maintained, smooth rotation of the roller 22 with respect to the outer race 6A and the inner race 7A can be achieved.

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]

Referring to Fig. 20, a second modification will be described. Fig. 20 is a plan view showing a second modification, and corresponds to the corresponding diagram of Fig. 1A.

As shown in FIG. 20, the roller group 2 is disposed in one row in the radiation direction DD of the roller 22. The retainer 3A is provided with an annular retaining member 36 at its outer peripheral portion. Since the inner peripheral portion of the retaining member 36 faces the outer open end portion 41 of the roller groove 32 of the retainer 3A, the roller 22 can be prevented from coming off the outer open end portion 41 of the roller groove 32. Features.

Further, the retaining member 36 may be disposed such that the roller group 2 as shown in FIG. 1A is arranged in a plurality of rows in the radiation direction DD of the roller 22.

The various configurations described above or described below can be combined as appropriate. For example, in the holder 103 holding the tapered roller 122 in the third embodiment, and the roller group 2 including the cylindrical roller 22 in the first embodiment or the second embodiment, the plurality of columns can be arranged in the radiation direction DD. The combination is configured to replace the outer rail wheel 106 and the inner rail wheel 107 corresponding to the tapered roller 122. In this case, the outer peripheral surface of the cylindrical roller 22 is disposed in parallel with each other between the outer rail wheel and the inner rail wheel.

In the third embodiment, the configurations of the first modification and the second modification can be applied. For example, the portions corresponding to the outer rail wheel 106 and the inner rail wheel 107 of the third embodiment may be provided in the casing and the shaft-shaped rotating member, respectively.

1‧‧‧Thrust roller bearings

2, 2A, 2B‧‧‧ Roller Group

3, 3A, 3B‧‧‧ retainers

22, 22A, 22B‧‧ ‧ Roller

31, 31A, 31B‧‧‧ Roller groove group

32, 32A, 32B‧‧‧roller slots

33, 33A, 33B‧‧‧ keeper assembly

35, 35A, 35B‧‧‧Deduction Department

DR‧‧‧ circumferential direction

DD‧‧‧radiation direction

J1‧‧‧Rotary axis

Claims (12)

A thrust roller bearing is a thrust roller bearing that is at least subjected to a thrust load, and has a roller group composed of a plurality of rollers arranged radially on a raceway surface, and is disposed in a radiation direction of the roller. a plurality of columns; and a plurality of rows of roller grooves for accommodating the rollers constituting the roller group, and constituting the number of the rollers of the roller group outside the radiation direction The number of the aforementioned rollers is larger than the number of the rollers constituting the roller group inside the radiation direction. The thrust roller bearing according to claim 1, wherein the retainer is constituted by a plurality of retainer assemblies arranged in the radiation direction, and the retainer assembly has one row of the rollers corresponding to one row of the roller groups. groove. A thrust roller bearing according to claim 2, wherein said plurality of retainer assemblies are freely coupled or separated toward said radiation direction. The thrust roller bearing of claim 2, wherein the plurality of retainer assemblies are not joined in the aforementioned radiation direction. The thrust roller bearing according to any one of claims 2 to 4, wherein the roller groove extends toward the radiation direction, is open outside the radiation direction, and is closed inside the radiation direction, and faces the holder The thickness direction is open, and the roller is placed in the roller groove, and the opening portion in the thickness direction of the retainer passing through the roller groove protrudes more than the holder in the thickness direction of the retainer. The roller groove restricts the roller from coming out of the open portion of the roller groove in the thickness direction of the retainer. The thrust roller bearing according to any one of claims 2 to 5, wherein the open end of the roller groove of the retainer assembly on the inner side in the radiation direction on the outer side in the radiation direction is the aforementioned outer side in the radiation direction The retainer assembly is sealed to restrict the aforementioned roller of the roller groove of the retainer assembly accommodated in the radiation direction from coming out to the outside of the radiation direction. A thrust roller bearing is a thrust roller bearing that is at least subjected to a thrust load, and has: a roller group composed of a plurality of rollers radially arranged on a raceway surface; and a retainer having a housing to form the roller group The roller groove of the roller, wherein the roller groove extends in a radial direction, is open to the outside in the radiation direction, is closed inside the radiation direction, and is open to the thickness direction of the holder, and the roller is housed in the roller. In the state of the roller groove, the opening portion in the thickness direction of the retainer passing through the roller groove protrudes more than the retainer from the thickness direction of the retainer, and the roller groove restricts the roller from being damaged. The open portion of the retainer of the roller groove in the thickness direction is released. A thrust roller bearing according to any one of claims 1 to 5, wherein the thrust roller bearing is a thrust roller bearing that is subjected to a thrust load and a radial load, The aforementioned track surface is conical. The thrust roller bearing according to any one of claims 1 to 8, wherein the roller has a substantially conical shape which is narrowed toward the inner side in the radiation direction of the roller. The thrust roller bearing of claim 8 or 9, wherein, in the track surface, a space between a raceway surface supporting the side of the roller and a raceway surface supported by the roller is formed and the roller a push-out shape corresponding to a substantially conical shape and gradually decreasing toward the inner side in the radiation direction, wherein a diameter of each of the outer ends of the rollers of the roller group inside the radiation direction is smaller than an inner end of each roller of the roller group outside the radiation direction The thickness of the aforementioned retainer assembly on the inner side in the aforementioned radiation direction is thinner than the thickness of the aforementioned retainer assembly on the outer side in the aforementioned radiation direction. The thrust roller bearing according to claim 10, wherein a central axis of any of the first rollers of the roller group on the inner side in the radiation direction and an arbitrary second roller central axis of the roller group on the outer side in the radiation direction Each of the first roller and the second roller constitutes a respective portion of a virtual substantially conical elongated roller that connects the two. The thrust roller bearing according to any one of claims 1 to 11, wherein the roller and/or the retainer are formed of a fluororesin.