JP2016138572A - Thrust roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thrust roller bearing which reduces frictional resistance of a retainer and prevents wear of a contact surface.SOLUTION: A radial roller bearing 15 using an inner peripheral surface 13b of a thrust retainer 13 and an outer peripheral surface 12c of a second flange part 12b of a second race 12 as raceway surfaces is disposed in a space enclosed by first and second thrust raceway surfaces 11a1, 12a1, the inner peripheral surface 13b of the thrust retainer 13, and the outer peripheral surface 12c of the second flange part 12b of the second race 12. The thrust retainer 13 is guided in a radial direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a thrust roller bearing, and more particularly to a thrust roller bearing that can reduce sliding resistance of a cage guide surface and suppress wear.

  Generally, a thrust roller bearing includes a plurality of rollers arranged radially, a cage that holds each roller, and a pair of thrust traces that clamp the rollers from both sides (for example, Patent Document 1). reference). In the thrust roller bearing described in Patent Literature 1, the cage is guided in a radial direction by being guided by a cylindrical portion formed in each thrust trace.

  Conventionally, a combination bearing in which a thrust bearing and a radial bearing are combined is known (see, for example, Patent Documents 2 and 3). The radial / thrust combination bearing of Patent Document 2 includes a radial inner race, a radial outer race, a plurality of radial rolling elements, and a radial bearing portion including a radial cage, a thrust first race, a thrust second race, and a plurality of thrusts. A rolling bearing and a thrust bearing portion provided with a thrust cage are integrally combined. By bringing the inner peripheral end surface of the first thrust race into contact with the outer peripheral surface of the radial inner race, The race and the thrust first race are relatively positioned by guiding one of the other positions. Thereby, highly accurate rotation is enabled over a long period of time.

  Further, the radial / thrust combined bearing of Patent Document 3 forms a radial race and a thrust trace integrally, and integrates the radial cage and the thrust cage so that both the radial load and the thrust load act. In addition to simplifying and facilitating the assembling work for the rotating part, the cost for the assembling work is reduced and the manufacturing cost of the entire bearing is reduced.

JP 2007-187173 A JP 2010-91038 A JP 2012-167690 A

  By the way, in the conventional thrust roller bearing, there are an inner diameter guide method and an outer diameter guide method as a guide method of the cage. In any case, the guide surface of the cage is guided by direct sliding contact with the race or the housing. Therefore, there is a problem that the sliding resistance between the cage and the race or the housing is large and the contact surface is worn.

  In Patent Documents 2 and 3, one radial / thrust combined bearing in which a thrust bearing and a radial bearing are arranged in an L shape supports a portion where a thrust load and a radial load act simultaneously. It does not solve the problems such as sliding resistance and wear of the contact surface.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a thrust roller bearing capable of reducing frictional resistance of a cage and preventing wear.

The above object of the present invention can be achieved by the following constitution.
(1) a plurality of rollers arranged radially;
A cage for holding the plurality of rollers;
A pair of thrust traces sandwiching the plurality of rollers from both sides;
A thrust roller bearing comprising:
The opposing surfaces of the pair of thrust traces are thrust raceway surfaces on which the plurality of rollers roll,
Of the pair of thrust traces, at least one thrust trace on the inner diameter side peripheral edge portion has a cylindrical flange portion formed toward the other thrust trace side in the axial direction,
In a space surrounded by the thrust raceway surfaces, the inner circumferential surface of the cage, and the outer circumferential surface of the flange portion, the inner circumferential surface of the cage and the outer circumferential surface of the flange portion are defined as a raceway surface. A radial roller bearing or a radial roller bearing comprising a radial ball bearing.
(2) a plurality of rollers arranged radially;
A cage for holding the plurality of rollers;
A pair of thrust traces sandwiching the plurality of rollers from both sides;
A thrust roller bearing comprising:
The opposing surfaces of the pair of thrust traces are thrust raceway surfaces on which the plurality of rollers roll,
Of the pair of thrust races, at least one thrust trace has a cylindrical flange portion formed on the outer diameter side peripheral portion thereof toward the other thrust race side in the axial direction.
In the space surrounded by the both thrust raceway surfaces, the outer circumferential surface of the cage, and the inner circumferential surface of the flange portion, the outer circumferential surface of the cage and the inner circumferential surface of the flange portion are defined as a raceway surface. A radial roller bearing or a radial roller bearing comprising a radial ball bearing.

  According to the thrust roller bearing of the present invention, the space surrounded by both thrust raceway surfaces, the inner peripheral surface of the cage, and the outer peripheral surface of the flange portion includes the inner peripheral surface of the cage and the outer peripheral surface of the flange portion. Are provided with radial roller bearings or radial ball bearings, and the cage is guided in the radial direction by the rolling bearings. Accordingly, the frictional resistance between the cage and the cage guide surface can be reduced to enable smooth rotation and to suppress wear. In addition, since a small radial bearing is incorporated in the thrust roller bearing, the thrust roller bearing in which the frictional resistance of the cage is reduced can be reduced in size.

  According to another thrust roller bearing of the present invention, in the space surrounded by both thrust raceway surfaces, the outer peripheral surface of the cage, and the inner peripheral surface of the flange portion, the outer peripheral surface of the cage and the inner surface of the flange portion are arranged. By providing a radial roller bearing or a radial ball bearing having a circumferential surface as a raceway surface, the cage is guided in the radial direction by the rolling bearing. Accordingly, the frictional resistance between the cage and the cage guide surface can be reduced to enable smooth rotation and to suppress wear. In addition, since a small radial bearing is incorporated in the thrust roller bearing, the thrust roller bearing in which the frictional resistance of the cage is reduced can be reduced in size.

It is principal part sectional drawing of the thrust roller bearing which concerns on 1st Embodiment of this invention. It is principal part sectional drawing of the thrust roller bearing of 2nd Embodiment. (A) is principal part sectional drawing of the thrust roller bearing of 3rd Embodiment, (b) is principal part sectional drawing of the thrust roller bearing of the modification of 3rd Embodiment. (A) is principal part sectional drawing of the thrust roller bearing of 4th Embodiment, (b) is principal part sectional drawing of the thrust roller bearing of the modification of 4th Embodiment. (A) is principal part sectional drawing of the thrust roller bearing of 5th Embodiment, (b) is principal part sectional drawing of the thrust roller bearing of the 1st modification of 5th Embodiment, (c) is 5th Embodiment. It is principal part sectional drawing of the thrust roller bearing of a 2nd modification.

  Hereinafter, each embodiment of a thrust roller bearing according to the present invention will be described in detail with reference to the drawings.

(First embodiment)
First, a thrust bearing according to a first embodiment of the present invention will be described with reference to FIG. The thrust roller bearing 10 </ b> A of the present embodiment is a cage roller guide type thrust roller bearing, and includes a first race 11, a second race 12, and a thrust holding member disposed between the first race 11 and the second race 12. And a plurality of rollers 14 which are rolling elements arranged radially in a plurality of pockets 13 a of the thrust holder 13.

The first race 11 includes an annular first race portion 11a, a cylindrical first flange portion 11b formed from the outer peripheral side peripheral portion of the first race portion 11a toward the second race side in the axial direction, And has a substantially L-shaped cross section. The second race 12 includes an annular second race portion 12a, and a cylindrical second flange portion 12b formed from the inner peripheral side peripheral portion of the second race portion 12a toward the first race side in the axial direction. And has a substantially inverted L-shaped cross section.
In the present embodiment, the first race 11 may have a shape without the first flange portion 11b.

  The thrust retainer 13 is a thin disk-shaped retainer made of, for example, a synthetic resin or a metal plate, and rotatably holds a plurality of rollers 14 in a plurality of radially arranged pockets 13a. Yes. The first race 11 and the second race 12 are arranged so as to face each other in the axial direction, and sandwich the plurality of rollers 14 from both sides. That is, the first race portion 11a of the first race 11 and the second race portion 12a of the second race 12 have the first and second thrust raceway surfaces 11a1 and 12a1 facing each other, so that the thrust is retained. A plurality of rollers 14 held in the pocket 13a of the container 13 roll to support a thrust load acting on the thrust roller bearing 10A.

  In the axial direction, it is surrounded by the first thrust raceway surface 11a1 and the second thrust raceway surface 12a1, and in the radial direction, the inner circumference surface 13b of the thrust retainer 13 and the outer circumference surface of the second flange portion 12b of the second race 12 A small radial roller bearing 15 is disposed in a space surrounded by 12c. The radial roller bearing 15 has a plurality of rollers 17 held in a plurality of pockets 16 a provided at equal intervals in the circumferential direction of the radial cage 16. The plurality of rollers 17 roll on the inner peripheral surface 13b of the thrust retainer 13 and the outer peripheral surface 12c of the second flange portion 12b. That is, the inner peripheral surface 13b of the thrust retainer 13 is an outer ring raceway surface, and the outer peripheral surface 12c of the second flange portion 12b is an inner ring raceway surface.

  The thrust roller bearing 10 </ b> A is mounted, for example, between the step portion 31 a of the rotating shaft 31 and the step portion 32 a of the housing 32. When the rotation shaft 31 rotates relative to the housing 32, the plurality of rollers 14 roll on the first race portion 11 a of the first race 11 and the second race portion 12 a of the second race 12 to rotate the rotation shaft 31. A thrust load acting between the housing 32 and the housing 32 is supported.

  At this time, the thrust retainer 13 also rotates with the rotation of the rotating shaft 31, but the inner diameter guide type thrust retainer 13 includes the inner peripheral surface 13b of the thrust retainer 13 and the outer peripheral surface 12c of the second flange portion 12b. It is guided by the radial roller bearing 15 arranged between them and rotates smoothly. Since the guide of the thrust cage 13 is changed from the conventional sliding guide to the rolling guide, the frictional resistance is reduced and the wear is prevented.

  As described above, according to the thrust roller bearing 10A of the present embodiment, the first and second thrust raceway surfaces 11a1, 12a1, the inner peripheral surface 13b of the thrust retainer 13, and the outer peripheral surface 12c of the second flange portion 12b. Is provided with a radial roller bearing 15 having an inner peripheral surface 13b of the thrust retainer 13 and an outer peripheral surface 12c of the second flange portion 12b as raceways, and rolls on the inner diameter side of the thrust retainer 13. invite. Accordingly, the friction resistance between the inner peripheral surface 13b of the thrust retainer 13 and the outer peripheral surface 12c of the second flange portion 12b can be reduced and rotated smoothly, and wear can be suppressed.

(Second Embodiment)
Next, with reference to FIG. 2, the thrust roller bearing which concerns on 2nd Embodiment of this invention is demonstrated. The thrust roller bearing of the present embodiment is the same as that of the first embodiment except that the cage guide method is an outer diameter guide method. The same reference numerals are given to the descriptions, and the description thereof is omitted or simplified (the same applies to the following embodiments).

The thrust roller bearing 10B of this embodiment is a cage outer diameter guide type thrust roller bearing, and includes first and second thrust raceway surfaces 11a1, 12a1, an outer peripheral surface 13c of the thrust cage 13, and a first race 11. A radial roller bearing 15 is disposed in a space surrounded by the inner peripheral surface 11c of the first flange portion 11b. The radial roller bearing 15 has a plurality of rollers 17 held in a plurality of pockets 16 a provided at equal intervals in the circumferential direction of the radial cage 16. The plurality of rollers 17 roll on the outer peripheral surface 13c of the thrust retainer 13 and the inner peripheral surface 11c of the first flange portion 11b to guide the thrust retainer 13 in the radial direction. That is, the inner peripheral surface 11c of the first flange portion 11b is an outer ring raceway surface, and the outer peripheral surface 13c of the thrust retainer 13 is an inner ring raceway surface.
In the present embodiment, the second race 12 may have a shape without the second flange portion 12b.

As described above, according to the thrust roller bearing 10B of the present embodiment, the first and second thrust raceway surfaces 11a1, 12a1, the outer peripheral surface 13c of the thrust retainer 13, and the inner peripheral surface of the first flange portion 11b. 11c is provided with a radial roller bearing 15 having the outer peripheral surface 13c of the thrust retainer 13 and the inner peripheral surface 11c of the first flange portion 11b as raceways, and the outer diameter side of the thrust retainer 13 is disposed on the outer diameter side of the thrust retainer 13. Guide to rolling. Accordingly, the friction resistance between the outer peripheral surface 13c of the thrust retainer 13 and the inner peripheral surface 11c of the first flange portion 11b can be reduced and rotated smoothly, and wear can be suppressed.
About another structure and an effect, it is the same as that of the said 1st Embodiment.

(Third embodiment)
Next, with reference to FIG. 3 (a) and (b), the thrust roller bearing which concerns on 3rd Embodiment of this invention is demonstrated.

  As shown in FIG. 3A, the thrust roller bearing 10C of the third embodiment is a cage inner diameter guide type thrust roller bearing, and the thrust cage 13 includes first and second thrust raceway surfaces 11a1, 12a1. And a radial ball bearing 20 disposed in a space surrounded by the inner peripheral surface 13b of the thrust retainer 13 and the outer peripheral surface 12c of the second flange portion 12b.

  The radial ball bearing 20 has a plurality of balls 22 held in a plurality of pockets 21 a provided at equal intervals in the circumferential direction of the radial cage 21. The plurality of balls 22 roll on the inner peripheral surface 13b of the thrust cage 13 and the outer peripheral surface 12c of the second flange portion 12b. That is, the inner peripheral surface 13b of the thrust retainer 13 is an outer ring raceway surface, and the outer peripheral surface 12c of the second flange portion 12b is an inner ring raceway surface.

As described above, according to the thrust roller bearing 10C of the present embodiment, the first and second thrust raceway surfaces 11a1, 12a1, the inner peripheral surface 13b of the thrust retainer 13, and the outer peripheral surface 12c of the second flange portion 12b. A radial ball bearing 20 having an inner peripheral surface 13b of the thrust retainer 13 and an outer peripheral surface 12c of the second flange portion 12b as raceway surfaces is provided in a space surrounded by the thrust retainer 13, and the thrust retainer 13 is rolled and guided. Accordingly, the friction resistance between the inner peripheral surface 13b of the thrust retainer 13 and the outer peripheral surface 12c of the second flange portion 12b can be reduced and rotated smoothly, and wear can be suppressed.
About another structure and an effect, it is the same as that of the said 1st Embodiment.

  As a modification of the third embodiment, a thrust retainer 13 is a radial ball bearing 20 as an outer diameter guide system as in a thrust roller bearing 10D shown in FIG. In this case, the plurality of balls 22 of the radial ball bearing 20 roll on the outer peripheral surface 13c of the thrust retainer 13 and the inner peripheral surface 11c of the first flange portion 11b, as in the second embodiment.

(Fourth embodiment)
Next, a thrust roller bearing according to a fourth embodiment of the invention will be described with reference to FIGS. 4 (a) and 4 (b).

  As shown in FIG. 4A, the thrust roller bearing 10E of the fourth embodiment is an inner / outer diameter guide type thrust roller bearing in which the cage is guided on both sides of the inner and outer diameters. That is, the thrust retainer 13 is disposed in a space surrounded by the first and second thrust raceway surfaces 11a1 and 12a1, the inner peripheral surface 13b of the thrust retainer 13, and the outer peripheral surface 12c of the second flange portion 12b. The radial roller bearing 15 and the first and second thrust raceway surfaces 11a1, 12a1, the outer peripheral surface 13c of the thrust retainer 13, and the inner peripheral surface 11c of the first flange portion 11b are disposed in a space. The radial roller bearings 15 are guided in the radial direction by the two radial roller bearings 15.

  The plurality of rollers 17 of each radial roller bearing 15 includes an inner peripheral surface 13b of the thrust retainer 13 and an outer peripheral surface 12c of the second flange portion 12b, and an outer peripheral surface 13c of the thrust retainer 13 and an inner periphery of the first flange portion 11b. The thrust retainer 13 is guided in the radial direction by rolling on the surface 11c.

As described above, according to the thrust roller bearing 10E of the present embodiment, the first and second thrust raceway surfaces 11a1, 12a1, the inner peripheral surface 13b of the thrust retainer 13, and the outer peripheral surface of the second flange portion 12b. 12c, and the space surrounded by the first and second thrust track surfaces 11a1, 12a1, the outer peripheral surface 13c of the thrust retainer 13, and the inner peripheral surface 11c of the first flange portion 11b, Radial roller bearings 15 are respectively provided to roll and guide the inner and outer diameters of the thrust cage 13. Thereby, while reducing the frictional resistance between the thrust holder | retainer 13, the 1st flange part 11b, and the 2nd flange part 12b, it can be rotated smoothly and abrasion can be suppressed.
About another structure and an effect, it is the same as that of the said 1st, 2nd embodiment.

  As a modification of the fourth embodiment, a thrust retainer 13 includes first and second thrust raceway surfaces instead of the two radial roller bearings 15 as in the thrust roller bearing 10F shown in FIG. 11a1, 12a1, a radial ball bearing 20 disposed in a space surrounded by the inner peripheral surface 13b of the thrust retainer 13, and the outer peripheral surface 12c of the second flange portion 12b, and the first and second thrust raceway surfaces 11 a 1, 12 a 1, two radial ball bearings 20 of a radial ball bearing 20 disposed in a space surrounded by the outer peripheral surface 13 c of the thrust retainer 13 and the inner peripheral surface 11 c of the first flange portion 11 b. May be.

(Fifth embodiment)
Next, a thrust roller bearing according to a fifth embodiment of the invention will be described with reference to FIGS. 5 (a), (b) and (c).

  In the thrust roller bearing 10G of the fifth embodiment shown in FIG. 5A, the radial roller bearing that guides the thrust cage 13 is a full roller bearing 25 that includes only rollers 26 (no cage).

The thrust roller bearing 10G is disposed in a space surrounded by the first and second thrust raceway surfaces 11a1 and 12a1, the inner peripheral surface 13b of the thrust retainer 13, and the outer peripheral surface 12c of the second flange portion 12b. This is an inner diameter guide type thrust roller bearing in which the thrust cage 13 is guided in the radial direction by a full roller bearing 25 having the inner circumferential surface 13b of the thrust cage 13 and the outer circumferential surface 12c of the second flange portion 12b as raceways.
About another structure and an effect, it is the same as that of the said 1st Embodiment.

  As a first modification of the fifth embodiment, the thrust retainer 13 may be an outer diameter guide system with a full roller bearing 25 as in the thrust roller bearing 10H shown in FIG. Alternatively, as a second modification of the fifth embodiment, the thrust retainer 13 may be an inner and outer diameter guide system by two full roller bearings 25 as in the thrust roller bearing 10I shown in FIG.

  In addition, this invention is not limited to each embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

10A, 10B, 10C, 10D, 10E, 10F, 10G, 10H, 10I Thrust roller bearing 11 First race (thrust trace)
11a, 12a Race portion 11a1 First thrust raceway surface 11b, 12b Flange portion 11c Flange portion inner peripheral surface (outer diameter side guide surface)
12 Race 2 (Thrust Race)
12a1 Second thrust raceway surface 12c Outer peripheral surface of flange (inner diameter side guide surface)
13 Thrust retainer (Retainer)
13a pocket 13b inner peripheral surface 13c outer peripheral surface 14 roller 15 radial roller bearing 20 radial ball bearing 25 full roller bearing

Claims (2)

A plurality of rollers arranged radially,
A cage for holding the plurality of rollers;
A pair of thrust traces sandwiching the plurality of rollers from both sides;
A thrust roller bearing comprising:
The opposing surfaces of the pair of thrust traces are thrust raceway surfaces on which the plurality of rollers roll,
Of the pair of thrust traces, at least one thrust trace on the inner diameter side peripheral edge portion has a cylindrical flange portion formed toward the other thrust trace side in the axial direction,
In a space surrounded by the thrust raceway surfaces, the inner circumferential surface of the cage, and the outer circumferential surface of the flange portion, the inner circumferential surface of the cage and the outer circumferential surface of the flange portion are defined as a raceway surface. A radial roller bearing or a radial roller bearing comprising a radial ball bearing. A plurality of rollers arranged radially,
A cage for holding the plurality of rollers;
A pair of thrust traces sandwiching the plurality of rollers from both sides;
A thrust roller bearing comprising:
The opposing surfaces of the pair of thrust traces are thrust raceway surfaces on which the plurality of rollers roll,
Of the pair of thrust races, at least one thrust trace has a cylindrical flange portion formed on the outer diameter side peripheral portion thereof toward the other thrust race side in the axial direction.
In the space surrounded by the both thrust raceway surfaces, the outer circumferential surface of the cage, and the inner circumferential surface of the flange portion, the outer circumferential surface of the cage and the inner circumferential surface of the flange portion are defined as a raceway surface. A radial roller bearing or a radial roller bearing comprising a radial ball bearing.

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