JP2001208076A - Roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller bearing equipped with two pieces type retainer in which each retainer can be held at proper position. SOLUTION: The roller bearing comprises comb-like retainers 8 and 9 which holds rollers 5 and 6 freely rollable mutually in each row of rollers wherein the comb-like retainers 8 and 9 are made independent individually for each row of roller and each retainer of 8 and 9 is so arranged that each circular ring 8a or 9a thereof faces back to back with each other for the circular rings 8a and 9a of the adjacent retainers 8 and 9 to be able to contact each other. With the retainers 8 and 9 being formed such that each center of gravity of the retainer of 8 and 9 is positioned inner side axially than a retainer guide area which guides a periphery of the retainer 8 or 9, the retainers can be rested against each other even when the retainer by itself impinges upon the retainer guide area by shifting its position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a roller bearing. More specifically, the present invention relates to a roller bearing that uses a comb-shaped retainer that holds the rollers in each roller row so as to be able to roll freely with each other.

[0002]

2. Description of the Related Art As roller bearings, various self-aligning roller bearings using a comb-shaped machined cage guided by an outer ring have been developed. The comb-shaped machined cage of the outer ring guide is superior in preventing abrasion of the cage guide surface as compared with other types of cages. Therefore, for example, when used at very high speed rotation, when used under conditions where the lubricant cannot be supplied sufficiently, when the bearing itself is used in a centrifugal force field due to the outer ring rotating load, etc. Often used under conditions.

FIG. 6 and FIG. 7 show a conventional self-aligning roller bearing using such a comb-shaped machined cage of an outer ring guide. The self-aligning roller bearing 60 shown in FIG.
Are two rows of rollers 65, 66 between the outer ring 62 and the inner ring 63.
Are arranged, and an integrated comb-shaped machined retainer 68 for both rollers is provided between the rollers. The integrated retainer 68 includes an annular portion 68a whose outer peripheral portion is in contact with the inner peripheral surface of the outer ring 62 and whose position is regulated, and a roller 6 extending from the annular portion 68a to both sides and being provided in each roller row.
The configuration is provided with pillar portions 68b and 68c that form pockets that regulate the circumferential intervals of 5, 66.

In the case of double row roller bearings, the revolving speed of the rollers during the rotation of the bearing differs for each row of rollers. Therefore, in the self-aligning roller bearing 60 using the integrated comb-shaped machined cage 68 shown in FIG. 6, one roller row having a high revolving speed is connected to the other roller row having a small revolving speed. May be dragged through. Therefore, in a row of rollers having a small revolving speed, a phenomenon occurs in which the rollers do not roll normally and slide between the inner and outer wheels. As a result, the heat generated inside the bearing may increase due to the sliding friction of the rollers, or the lubrication conditions for the rolling surfaces of the rollers may become severe.

In particular, in a roller bearing used in an impact environment, a phenomenon occurs in which a roller located in a non-load zone collides with a cage due to an impact acting on the bearing. Therefore, the impact energy at that time causes high stress on the cage,
Attempting to extend the life may be problematic.

[0006] The self-aligning roller bearing 60 using the above-mentioned integrated comb-shaped machined cage 68 is located in the non-load zone of both roller rows when used in an impact environment. Since the rollers simultaneously collide with the single cage 68, the cage 68 receives a large impact energy. Accordingly, a high stress is generated in the retainer 68 by the impact energy, and there is a problem that it is necessary to improve the impact resistance of the retainer.

In order to solve the above-mentioned problem, as shown in FIG. 7, there has been proposed a self-aligning roller bearing 70 using independent comb-shaped machined retainers 78, 79 for each roller row. Hereinafter, the self-aligning roller bearing 70 will be described. As shown in FIG. 7, the self-aligning roller bearing 70
Are two rows of rollers 75, 76 between the outer ring 72 and the inner ring 73.
Are provided, and independent comb-shaped machined holders 78, 79 are provided for each roller row. Each of the retainers 78, 79 has annular portions 78a, 79a whose outer peripheral portions are in contact with the inner peripheral surface of the outer ring 72 and whose position is regulated, and which extends from these annular portions 78a, 79a and rolls in each roller row. Are provided with column portions 78b and 79b forming pockets that regulate the circumferential spacing of.

[0008]

When two independent comb-shaped machined cages 78, 79 are used for each roller row shown in FIG. 7, the environment in which vibration is applied to the bearing 70, the bearing 70 Depending on the conditions under which centrifugal force is applied, FIG.
As shown in (a), the retainers 78 and 79 may move and collide with the inner peripheral surface of the outer race 72. Here, since the centers of gravity 78c, 79c of the retainers 78, 79 are located axially outside the outer ring guides 78g, 79g of the retainers 78, 79, when they collide with the inner peripheral surface of the outer ring 72,
With the moment M, the retainers 78 and 79 in each row
As shown in FIG. 8 (b), there was a case where it opened in a V shape.

On the other hand, during normal rotation of the bearing 70, the retainers 78 and 79 try to close each other due to the centrifugal force and the like of the rollers. Therefore, since the retainers 78 and 79 open and close while rotating, there is a possibility that problems such as wear, poor roller guidance, and vibration noise may occur.

[0010] In view of such circumstances, an object of the present invention is to provide a roller bearing equipped with a two-piece cage capable of holding each cage at an appropriate position.

[0011]

SUMMARY OF THE INVENTION The object of the present invention is to provide a comb-shaped retainer for holding the rollers in each roller row so as to be rotatable relative to each other, making the comb-shaped cage independent for each roller row, In a roller bearing in which the cages are abutted against each other so that the annular portions of the adjacent cages come into contact with each other, the center of gravity of each of the cages guides the outer periphery of the cage. This is attained by providing a roller bearing characterized in that the cage is formed so as to be positioned axially inward of the cage guide portion or more.

According to the above configuration of the present invention, the center of gravity of each of the cages is located axially inward of the cage guide portion that guides the outer periphery of the cage. However, the cages are held by each other even when the cage collides with the inner peripheral surface of the outer ring on the outer periphery of the cage at the cage guide portion. Therefore, since the cages do not open, each cage can be held at an appropriate position.

The configuration in which the center of gravity of the cage is located axially inward of the cage guide portion is, for example, to increase the mass of the annular portion or reduce the mass of the column portion as compared with the conventional case. Can be achieved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a first embodiment of the present invention.
FIG. 2 is a partial cross-sectional view of the spherical roller bearing 1 according to the embodiment.

As shown in FIG. 1, in a self-aligning roller bearing 1 according to a first embodiment of the present invention, two rows of rollers 5 and 6 are provided between an outer ring 2 and an inner ring 3, and Each roller row is provided with an independent comb-shaped machined cage 8,9. Each of the retainers 8, 9 has an annular portion 8a, 9a whose outer peripheral portion is in contact with the inner peripheral surface of the outer ring 2 and whose position is regulated.
And column portions 8b, 9b extending from the annular portions 8a, 9a to form pockets that regulate the circumferential spacing of the rollers 5, 6 in each roller row.

As a characteristic configuration of the first embodiment, the adjacent annular portions 8a, 9a of the cages 8, 9 are large in a state where they face each other on the radial center plane H of the bearing 1. Part is in contact, but the notch 8
u, 9u are formed.

Further, the annular portions 8a, 9a of the retainers 8, 9
Of the conventional retainer 7 shown in FIG.
8, 79 are wider than the width of the annular portions 78a, 79a, and the widths (axial lengths) of the column portions 8b, 9b.
Is set to be narrower than the width of the pillars 78b, 79b of the conventional retainers 78, 79, also shown in FIG. With such a configuration, by adjusting the width dimension appropriately, the center of gravity C of the cage 9 is located between the axial outer edge of the guide portion range G of the annular portion 9a of the cage 9 and the radial center plane H. Is located. Although not shown, the other cage 8
Is also set axially inward of the guide area. For the position of the center of gravity, refer to well-known literature, for example, Mechanical Engineering Handbook (Revised on April 15, 1968, Fifth Edition 2).
The details are described on page 10 of 3
Description is omitted.

With the above configuration, even if the cages 8 and 9 move and collide with the inner peripheral surface of the outer ring 2, the center of gravity of the cages 8 and 9 is set to the axis of the guide portion range G of the cages 8 and 9. By being located between the outer edge in the direction and the radial center plane H, the retainers 8 and 9 are held together and do not open in a C-shape.
As shown in FIG. 2, when lubricating oil is supplied into the bearing 10 by forming an oil supply hole 12 a in the outer ring 12, the lubricating oil is supplied to the notches 8 u and 9 u of the retainers 8 and 9. Therefore, the lubricating oil can be effectively spread on the mating surfaces of the annular portions 8a, 9a, and the wear resistance can be improved.

Next, a self-aligning roller bearing according to a second embodiment of the present invention will be described. FIG. 3 is a partial sectional view of a spherical roller bearing 20 according to a second embodiment of the present invention.

As shown in FIG. 3, a self-aligning roller bearing 20 according to a second embodiment of the present invention also has two rows of rollers 25, 26 between an outer ring 22 and an inner ring 23, as in the first embodiment.
, And independent comb-shaped holders 28 and 29 are provided for each roller row. Each of the retainers 28 and 29 includes annular portions 28a and 29a whose outer peripheral portions are in contact with the inner peripheral surface of the outer ring 22 and whose position is regulated.
Pillar portions 28b, 29b are formed from these annular portions 28a, 29a to form pockets for regulating the circumferential spacing of the rollers in each roller row.

As a characteristic configuration of the second embodiment, adjacent annular portions 28a, 29a of the retainers 28, 29 respectively.
Are in contact with each other on the center plane H in the radial direction of the bearing 20 in a state in which the bearings face each other back to back. The width (length in the axial direction) of the annular portions 28a and 29a is substantially the same as that of the first embodiment, and the width of the pillars 28b and 29b is
8b, 79b are substantially the same as the width (length in the axial direction). On the other hand, notches are not formed on the outer peripheral surfaces of the annular portions 28a and 29a as in the first embodiment. With such a configuration, by appropriately adjusting the dimensions, the center of gravity C is located within the guide portion range G of the annular portion 29a of the retainer 29. Although not shown, the other retainer 28
Is also located within the guide area.

With the above configuration, even if the cages 28 and 29 move and collide with the inner peripheral surface of the outer race 22, the center of gravity of the cages 28 and 29 will be in the guide portion range G of the cages 28 and 29. By being located inside, the retainers 28 and 29 are held together and do not open in a C-shape.

FIGS. 4 and 5 show modified examples of the cage.
The retainers 38 and 39 shown in FIG. 4 include annular portions 38a and 39a whose outer peripheral portions are in contact with the inner peripheral surface of the outer ring and whose positions are regulated, and extend from these annular portions 38a and 39a and are provided in each roller row. Column portions 38b and 39b are formed to form pockets for regulating the circumferential interval of the rollers. The retainers 38, 3
9 has substantially the same configuration as that of the second embodiment, but the characteristic configuration is that the outer peripheral surfaces of the pillars 38b and 39b are partially different from the pillars 28b and 29b of the second embodiment. Are cut out in a tapered shape. That is, the pillars 38b,
Notches 38c and 39c are formed in 39b. With such a configuration, the centers of gravity of the retainers 38 and 39 are located on the inner side in the axial direction as compared with the related art.

The retainers 48 and 49 shown in FIG. 5 have annular portions 48a and 49a and pillar portions 48b and 49b. The retainers 48 and 49 also have substantially the same configuration as that of the second embodiment.
Thick portions 48d and 49d are formed on the inner peripheral surfaces of the a and 49a. With this configuration, the retainer 4
The center of gravity of 8,49 is located on the inner side in the axial direction as compared with the related art.

As described above, even if the retainers 38 and 39 and the retainers 48 and 49 move and collide with the inner peripheral surface of the outer ring, the retainer 3
8, 39 and the retainers 48, 49 are held together and do not open in a C-shape.

In any of the above-mentioned cages,
The outer peripheral surface of the cage preferably has a radius of curvature slightly smaller than the radius of curvature of the outer raceway surface. By forming the radius of curvature in this way, the inner peripheral surface of the outer ring and the outer peripheral portion of the cage come into line contact near the center in the axial direction, and the effect of holding each other due to the center of gravity being axially inward. It is because it is easy to demonstrate.

The embodiment of the present invention has been described above.
The roller bearing of the present invention is not limited to the embodiment described above, and can be appropriately modified and improved. For example,
In the roller bearing of the present invention, the cage is formed such that the center of gravity of each of the cages is located between the axial outer edge of the cage guide portion that guides the outer periphery of the cage and the radial center plane. When the center of gravity cannot be located in the above-described configuration for some reason such as the reason for forming the retainer, it is preferable to form the retainer so as to be closer to the inside in the axial direction as compared with the related art. Further, the retainer is not limited to the machined retainer, but may be a press retainer or the like. Further, JP-A-8-28
In the roller bearing provided with a guide ring as shown in FIG. 11 of JP-A-576-576, the center of gravity of the retainer is set such that the center of gravity of the retainer is axially inward or axial relative to the position of the guide ring and the guide portion of the retainer. If they are the same, there is a sharing effect. Also,
As a method of shifting the center of gravity of the cage inward in the axial direction as compared with the conventional method, it is also possible to make the column portion thinner or shorter, and to increase the width dimension of the annular portion,
Even if the height (radial length) is increased, it can be moved inward. The same applies to the case where the cage guide surface is provided on the inner circumferential surface of the cage.

[0028]

As described above, according to the roller bearing of the present invention, the center of gravity of each of the two-piece cage is formed by the axial outer edge and the radial center plane of the cage guide portion for guiding the outer periphery of the cage. Since the cage is formed so as to be located between the cages, the cages are held together even if the cage moves and collides with the cage guide part. Therefore, the cages can be held at appropriate positions without the cages being opened, so that wear of the cages, poor roller guidance, vibration noise, and the like can be reduced.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a spherical roller bearing 1 according to a first embodiment of the present invention.

FIG. 2 is a self-aligning roller bearing 10 having an oil supply hole formed in an outer ring.
FIG.

FIG. 3 is a partial sectional view of a self-aligning roller bearing 20 according to a second embodiment of the present invention.

FIG. 4 is a modified example of the cage.

FIG. 5 is a modified example of the cage.

FIG. 6 is a partial sectional view of a conventional self-aligning roller bearing using a comb-shaped machined cage guided by an outer ring.

FIG. 7 is a partial sectional view of a conventional self-aligning roller bearing using a two-piece comb-shaped machined cage of outer ring guide.

8A is a partial cross-sectional view of a state in which retainers 78 and 79 of the self-aligning roller bearing 70 shown in FIG. 7 have moved and collided with an outer ring 72 (rollers are omitted). FIG. FIG. 5 is a partial cross-sectional view of a state where cages 78 and 79 of the self-aligning roller bearing 70 are opened by a moment (rollers are omitted).

[Explanation of symbols]

1,20 Self-aligning roller bearing 2,22 Outer ring 3,23 Inner ring 5,6,25,26 Roller 8,9,28,29,38,39,48,49 Comb-shaped machined cage 8a, 9a, 28a, 29a, 38a, 39a, 48
a, 49a Annular part 8b, 9b, 28a, 29a, 38b, 39b, 48
b, 49b Column 8u, 9u Notch

Claims (1)

[Claims] 1. A comb-shaped retainer for rotatably holding rollers in each roller row, wherein the comb-shaped cage is made independent for each roller row.
In a roller bearing formed by abutting the respective cages back-to-back so that the annular portions of adjacent cages come into contact with each other, the center of gravity of each of the cages guides the outer periphery of the cage. A roller bearing, wherein the cage is formed so as to be located axially inward of the cage guide portion or more.