JP2006194375A - Thrust cylindrical roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thrust cylindrical roller bearing capable of improving the life of the bearing and reducing the manufacturing cost by improving the shape of the axial end of the cylindrical roller.
SOLUTION: A plurality of cylindrical rollers 13a to 13c are provided between a pair of raceway members 12a and 12b facing each other in the axial direction so as to be able to roll in a circumferential direction via a cage 14, and a pocket of the cage 14 is provided. 14 a is a thrust cylindrical roller bearing in which a plurality of cylindrical rollers 13 a to 13 c are arranged side by side in the radial direction of the cage 14, and each of the plurality of cylindrical rollers 13 a to 13 a arranged in the pocket 14 a of the cage 14. A convex spherical surface 16 is provided at the axially outer end of the cylindrical roller 13c located on the outermost side in the radial direction of the retainer 14, and the axially inner end is formed as a flat surface 19 with the remaining cylindrical rollers 13a and 13b. Both end portions in the axial direction are flat surfaces 19.
[Selection] Figure 1

Description

  The present invention relates to a thrust cylindrical roller bearing that supports a rotating shaft that receives a large thrust force, and more particularly, a thrust cylindrical roller bearing in which at least two cylindrical rollers are arranged in a radial direction with respect to a pocket of a cage. About.

  For example, as shown in FIGS. 6 and 7, the conventional thrust cylindrical roller bearing 100 has a circumferential direction between a pair of race rings (track members) 102 a and 102 b in order to suppress the life reduction due to differential sliding as much as possible. Three rows of cylindrical rollers 103 a to 103 c arranged at a plurality of positions at substantially equal intervals are interposed via a cage 104 so as to be able to roll, and each cylindrical roller 103 a to 103 c is one pocket of the cage 104. In 104a, it arrange | positions on the coaxial line from the radial direction inner side to the outer side of the holder | retainer 104. FIG.

  Of the three rows of cylindrical rollers 103a to 103c arranged in the pocket 104a of the cage 104, the axially outer end of the cylindrical roller 103c located on the outermost side in the radial direction of the cage 104 (in the radial direction of the cage 104) Since the end facing outwardly rolls while being constantly pressed against the radially outer inner peripheral surface 105 of the pocket 104a by the centrifugal force acting on the cylindrical rollers 103a to 103c, the cylindrical rollers 103a to 103c A convex spherical surface portion 16 is provided at the outer end portion in the axial direction of this, so that wear occurs at the edge portion 108 between the outer end portion in the axial direction of the cylindrical roller 103c and the outer peripheral surface 105 of the pocket 104a. I try to prevent it.

And this convex spherical surface part 16 is provided in the axial direction outer end part of all the cylindrical rollers 103a-103c, in order to eliminate an assembly mistake on the assembly management of a thrust cylindrical roller bearing.
In the drawing, reference numeral 17 denotes a chamfered portion provided between the outer peripheral surface and the axial end face in each of the cylindrical rollers 103a to 103c, and reference numeral 19 denotes an axial inner end of each of the cylindrical rollers 103a to 103c. (See, for example, Patent Document 1).

In addition, as an application of this thrust cylindrical roller bearing, a swing ladder bearing used for a sliding portion of a chock such as a rolling mill is known (for example, see Patent Document 2).
JP 2003-343564 A JP 2004-84720 A

  However, since the conventional thrust cylindrical roller bearing 100 is provided with the convex spherical surface portion 16 at the outer ends in the axial direction of all the cylindrical rollers 103a to 103c arranged in the pocket 104a of the cage 104, a pair of There is a problem that the effective contact length between the race rings 102a and 102b and the cylindrical rollers 103a to 103c is reduced, the contact surface pressure between the pair of race rings 102a and 102b is increased, and the rolling life is shortened. This problem becomes more prominent as the number of cylindrical rollers arranged in the pocket 104a of the cage 104 increases. Moreover, since the convex spherical surface part 16 is provided in the axial direction outer end part of all the cylindrical rollers 103a-103c, there existed a problem that manufacturing cost increased.

  The present invention has been made to eliminate such inconveniences, and its object is to improve the shape of the axial end of the cylindrical roller to improve the life of the bearing and reduce the manufacturing cost. It is an object of the present invention to provide a thrust cylindrical roller bearing capable of achieving the above.

The above object of the present invention is achieved by the following configurations.
(1) A plurality of cylindrical rollers are provided between a pair of raceway members facing each other in the axial direction so as to be able to roll in the circumferential direction via a cage, and at least two cylindrical rollers are provided in a pocket of the cage. Is a thrust cylindrical roller bearing arranged side by side in the radial direction of the cage,
Among the at least two cylindrical rollers arranged in the pocket of the cage, a convex spherical surface portion is provided at the axially outer end portion of the cylindrical roller located on the outermost side in the radial direction of the cage, and the axial direction A thrust cylindrical roller bearing characterized in that the inner end portion is a flat surface and both axial end portions of the remaining cylindrical rollers are flat surfaces.

  According to the present invention, among the at least two cylindrical rollers arranged in the pocket of the cage, the convex spherical surface portion is provided at the axially outer end portion of the cylindrical roller located on the outermost side in the radial direction of the cage, and the shaft Since the inner end in the direction is a flat surface and both ends in the axial direction of the remaining cylindrical rollers are flat surfaces, the effective contact length between at least two cylindrical rollers disposed in the pocket of the cage and the pair of raceway members is Since the contact surface pressure generated between the cylindrical roller and the pair of raceway members can be lowered, the life of the bearing can be improved. Moreover, since the number of cylindrical rollers which process the convex spherical surface portion can be reduced, the manufacturing cost of the bearing can be reduced.

Hereinafter, embodiments according to the thrust cylindrical roller bearing of the present invention will be described in detail with reference to the drawings.
1 is a partially cutaway plan view of a thrust cylindrical roller bearing according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 3 is a modified example of the cage of FIG. FIG. 4 is an explanatory view of a swing ladder bearing according to a second embodiment of the present invention, and FIG. 5 is a cross-sectional view of a multistage thrust cylindrical roller bearing according to a third embodiment of the present invention. . In the first embodiment of the present invention, the same basic structure as that of the conventional thrust cylindrical roller bearing 100 already described with reference to FIGS. 6 and 7 is used as an example. Therefore, the description of overlapping or corresponding parts is omitted or simplified.

(First embodiment)
First, with reference to FIG.1 and FIG.2, the thrust cylindrical roller bearing which is 1st Embodiment of this invention is demonstrated.

  As shown in FIGS. 1 and 2, the thrust cylindrical roller bearing 10 according to the present embodiment is arranged in a plurality of rows arranged at a plurality of positions at approximately equal intervals in the circumferential direction between a pair of race rings (track members) 12 a and 12 b. The cylindrical rollers 13a to 13c are interposed so as to be able to roll via the retainer 14, and the three rows of cylindrical rollers 13a to 13c are coaxial with the pocket 14a of the retainer 14 along the radial direction of the retainer 14. It is arranged on the line.

  And the convex spherical surface part 16 is provided in the axial direction outer end part of the cylindrical roller 13c located in the radial direction outermost side of the holder | retainer 14 among the three cylindrical rollers 13a-13c arrange | positioned at the pocket 14a of the holder | retainer 14. Thus, wear of the edge portion 18 between the outer end surface in the axial direction of the cylindrical roller 13c and the outer inner peripheral surface 15 of the pocket 14a is prevented, and the inner end portion in the axial direction is set as a flat surface 19 with the remaining cylindrical rollers 13a. , 13b are both flat ends 19 in the axial direction.

  Here, the diameter of each cylindrical roller 13a-13c in this embodiment is φ10 mm, the roller length of the cylindrical roller 13a: 7 mm, the roller length of the cylindrical roller 13b: 8 mm, the roller length of the cylindrical roller 13c: 9 mm, each When the dimension of the chamfered portion 17 is 0.5 mm and the effective contact length reduction by the convex spherical surface portion 16 of the cylindrical roller 13c is 0.35 mm, the pair of race rings 12a and 12b and the cylindrical rollers 13a to 13c The effective contact length is cylindrical roller 13a: 6 mm, cylindrical roller 13b: 7 mm, and cylindrical roller 13c: 7.65 mm, which is 20.65 mm in total.

  On the other hand, in the conventional thrust cylindrical roller bearing 100 shown in FIGS. 6 and 7, the roller diameter and roller length of each cylindrical roller, the dimensions of each chamfered portion 17, and the effective contact length reduction by the convex spherical portion 16. When the minutes are the same, the effective contact length between the pair of race rings 102a and 102b and the cylindrical rollers 103a to 103c is as follows: cylindrical roller 103a: 5.65 mm, cylindrical roller 103b: 6.65 mm, cylindrical roller 103c: 7 .65 mm for a total of 19.95 mm. Therefore, in this embodiment, compared with the conventional thrust cylindrical roller bearing 100, the effective contact length between the pair of race rings and the cylindrical roller can be increased by 0.7 mm.

  Thus, in this embodiment, the axial direction outer end part of the cylindrical roller 13c located in the radial direction outermost side of the holder | retainer 14 among the three cylindrical rollers 13a-13c arrange | positioned at the pocket 14a of the holder | retainer 14 is carried out. Are provided in the pocket 14a of the cage 14 because the convex spherical portion 16 is provided on the inner surface and the inner end in the axial direction is a flat surface 19 and both ends in the axial direction of the remaining cylindrical rollers 13a and 13b are flat surfaces 19. The effective contact length between the three cylindrical rollers 13a to 13c and the pair of race rings 12a and 12b can be increased. Thereby, since the contact surface pressure which arises between cylindrical roller 13a-13c and a pair of track rings 12a and 12b can be made low, the lifetime of a bearing can be aimed at. Further, since the convex spherical surface portion 16 is not processed at the axial end portions of the cylindrical rollers 13a and 13b, the manufacturing cost of the bearing can be reduced.

  As a modification of the present embodiment, the cage 14 may be a cage 14 'as shown in FIG. The retainer 14 'includes a retainer body 14b' having a pocket 14a 'for retaining the cylindrical rollers 13a to 13c, an annular outer ring lid 14c' covering the outer periphery, and an outer ring lid 14c '. It is comprised with pin 14d 'fastened to main body 14b'.

  In this case, although the number of members of the cage 14 'increases, the cylindrical rollers 13a to 13c are held in the pockets 14a' of the cage body 14b ', so that the thrust cylindrical roller bearing 10 can be easily manufactured and assembled.

(Second Embodiment)
Next, with reference to FIG. 4, the swing ladder bearing which is 2nd Embodiment of this invention is demonstrated. In addition, about the part which overlaps with 1st Embodiment, the same code | symbol is attached | subjected to a figure, and the description is abbreviate | omitted or simplified.

As shown in FIG. 4, the swing ladder bearing 20 of the present embodiment includes a pair of race plates (track members) 22 a and 22 b arranged to face each other, and a circular arc plate-like cage 24 between the race plates 22 a and 22 b. 4 rows of cylindrical rollers 23a to 23d that are arranged so as to roll in the circumferential direction, and a guide member 26 that guides the cage 24 in the circumferential direction. In the cage 24, two rows of pockets 24a are formed at substantially equal intervals in the circumferential direction in the curvature radius direction, and four rows of cylindrical rollers 23a to 23d are provided in the pocket 24a of the cage 24 with the curvature of the cage 24. It is arranged on the coaxial line along the radial direction.
Then, each track plate 22a, 22b is repeatedly rotated relatively at a relatively small angle with the center of curvature of the arc-shaped cage 24 as a fulcrum.

  The guide member 26 is in sliding contact with the outer peripheral portion and inner peripheral portion of the retainer 24, and guides the outer peripheral portion and inner peripheral portion along the circumferential direction to thrust the raceway plates 22a, 22b and the retainer 24. It is rotated, and is fixed to the track plate 22b.

  Here, in this embodiment, out of the four cylindrical rollers 23a to 23d disposed in the pocket 24a of the cage 24, the outer end in the axial direction of the cylindrical roller 23d located on the outermost side in the radius direction of curvature of the cage 24 Is provided with a convex spherical surface portion 16 to prevent wear of the edge portion 28 between the axial outer end portion of the cylindrical roller 23d and the outer inner peripheral surface 25 of the pocket 24a, and the axial inner end portion is flat. 19, both axial ends of the remaining cylindrical rollers 23 a, 23 b, and 23 c are flat surfaces 19.

Therefore, in the swing ladder bearing 20 of the present embodiment, the shaft of the cylindrical roller 23d located on the outermost side in the radius of curvature of the cage 24 among the four cylindrical rollers 23a to 23d arranged in the pocket 24a of the cage 24. Since the convex spherical surface portion 16 is provided at the outer end portion in the direction, the inner end portion in the axial direction is the flat surface 19, and both end portions in the axial direction of the remaining cylindrical rollers 23a to 23c are the flat surfaces 19, the pocket 24a of the cage 24 The effective contact length between the four cylindrical rollers 23a to 23d and the pair of raceway plates 22a and 22b can be increased. Thereby, since the contact surface pressure which arises between cylindrical roller 23a-23d and a pair of track plates 22a and 22b can be made low, the lifetime of a bearing can be aimed at. Further, since the convex spherical surface portion 16 is not processed at the axial end portions of the cylindrical rollers 23a to 23c, the manufacturing cost of the bearing can be reduced.
Since other configurations and operational effects are the same as those of the first embodiment, description thereof will be omitted.

(Third embodiment)
Next, with reference to FIG. 5, the multistage thrust cylindrical roller bearing which is 3rd Embodiment of this invention is demonstrated. In addition, about the part which overlaps with 1st Embodiment, the same code | symbol is attached | subjected to a figure, and the description is abbreviate | omitted or simplified.

  As shown in FIG. 5, the multi-stage thrust cylindrical roller bearing 30 of this embodiment is used, for example, in a speed reducer of a plastic molding extruder and the like, and an inner ring (track member) 32 a and an outer ring ( A bearing portion 31 in which two rows of cylindrical rollers 33a and 33b arranged at a plurality of positions in the circumferential direction at a substantially equal interval between the raceway member) 32b are rotatably mounted via a cage 34. It is arranged in multiple stages (eight stages in the figure) in the direction. The two rows of cylindrical rollers 33 a and 33 b are arranged on the same line in the pocket 34 a of the cage 34 along the radial direction of the cage 34.

An inner ring spacer 35 is interposed between the inner rings 32a facing each other in the axial direction, and each inner ring 32a and each inner ring spacer 35 are attached to the rotary shaft 36 via a sleeve 38, and in the axial direction. An outer ring spacer 37 is interposed between the opposed outer rings 32b, and each outer ring 32b and each outer ring spacer 37 are attached to a housing (not shown).
Thereby, since the thrust load transmitted from the reduction gear to the rotating shaft 36 can be distributed and received by the plurality of thrust cylindrical roller bearings, the burden on one thrust cylindrical roller bearing can be reduced.

  Here, in the present embodiment, a convex spherical surface is formed on the outer end in the axial direction of the cylindrical roller 33b located on the radially outer side of the cage 34 out of the two cylindrical rollers 33a and 33b accommodated in the pocket 34a of the cage 34. While providing the part 16, the axial inner end part is made into the flat surface 19, and the axial direction both ends of the other cylindrical roller 33a are made into the flat surface 19.

Therefore, in the multi-stage thrust cylindrical roller bearing 30 of the present embodiment, the shaft of the cylindrical roller 33b located in the two cylindrical rollers 33a and 33b disposed in the pocket 34a of the cage 34 and outside the cage 34 in the radial direction. The convex spherical portion 16 is provided at the outer end portion in the direction, the inner end portion in the axial direction is the flat surface 19, and both end portions in the axial direction of the remaining cylindrical rollers 33a are the flat surfaces 19, so that they are arranged in the pocket 34a of the cage 34. The effective contact length between the two rows of cylindrical rollers 33a and 33b and the inner ring 32a and the outer ring 32b facing each other in the axial direction can be increased. As a result, the contact surface pressure generated between the cylindrical rollers 33a and 33b, the inner ring 32a, and the outer ring 32b can be reduced, so that the life of the bearing can be improved. Further, since the convex spherical surface portion 16 is not processed at the outer end in the axial direction of the cylindrical roller 33a, the manufacturing cost of the bearing can be reduced.
Since other configurations and operational effects are the same as those of the first embodiment, description thereof will be omitted.

  In addition, this invention is not limited to said each embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.

  In addition, the material, shape, dimensions, form, number, arrangement location, etc. of the raceway member, cylindrical roller, cage, pocket, convex spherical surface, flat surface, etc. exemplified in the above embodiment can achieve the present invention. It is arbitrary and is not limited.

1 is a partially cutaway plan view of a thrust cylindrical roller bearing according to a first embodiment of the present invention. It is sectional drawing along the AA line of FIG. It is a partially cutaway top view which shows the modification of the holder | retainer of FIG. It is explanatory drawing of the swing ladder bearing which is 2nd Embodiment of this invention, (a) is a partially notched top view, (b) is a lower side view of (a). It is sectional drawing of the multistage thrust cylindrical roller bearing which is 3rd Embodiment of this invention. It is a partially cutaway plan view of a conventional thrust cylindrical roller bearing. It is sectional drawing along the BB line of FIG.

Explanation of symbols

10 Thrust cylindrical roller bearings 12a, 12b Race rings (Race members)
13a, 13b, 13c Cylindrical roller 14, 14 'Retainer 14a, 14a' Pocket 14b 'Retainer body 14c' Outer ring lid 14d 'Pin 15 Outer inner peripheral surface 16 Convex spherical surface portion 17 Chamfered portion 18 Edge portion 19 Flat surface 20 Swing ladder bearing 22a, 22b Raceway plate (race member)
23a, 23b, 23c, 23d Cylindrical roller 30 Multi-stage thrust cylindrical roller bearing 32a Inner ring (track member)
32b Outer ring (track member)
33a, 33b Cylindrical roller

Claims (1)

A plurality of cylindrical rollers are provided between a pair of raceway members facing each other in the axial direction so as to be able to roll in a circumferential direction via a cage, and at least two cylindrical rollers are provided in the pocket of the cage. A thrust cylindrical roller bearing arranged side by side in the radial direction of the cage,
Among the at least two cylindrical rollers arranged in the pocket of the cage, a convex spherical surface portion is provided at the axially outer end portion of the cylindrical roller located on the outermost side in the radial direction of the cage, and the axial direction A thrust cylindrical roller bearing characterized in that the inner end portion is a flat surface and both axial end portions of the remaining cylindrical rollers are flat surfaces.

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