JP2003013967A - Retainer of turning bearing and turning bearing using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve lubricating performance of a rolling contact surface and sliding contact surface by smoothly circulating a lubricating agent into a pocket of a retainer and to actualize a turning bearing having long rolling fatigue life. SOLUTION: In the retainer 6 of a turning bearing arranged a required number of pockets accommodating rollers by partitioning a pair of gentle arc-shaped side walls 7 and 7 by means of pillars 8 arranged in designated intervals, the pillars 8 are alternately slanted each other in a directly-opposed state at a circumferential direction, and the retainer 5 is supported b keeping in contact with the rollers 3 and 4 and pillar 8, and a space existing between the under surface of the retainer 6 and raceway surfaces 1a and 2b is formed therein. Thus, the lubricating agent is supplied and circulated into the pockets 9 and 9a through the space, and lubricating performance of rolling contact surfaces among the roller 3 and 4, the pockets 9 and 9a, and the raceway surfaces 1a and 2b and sliding surfaces among the retainer 6 and raceway surfaces is improved accordingly. Consequently, surface damage is controlled, and fatigue life is further satisfactory.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cage for a cylindrical roller of a slewing bearing and a slewing ring bearing using the cage.

[0002]

2. Description of the Related Art As a large slewing bearing used in a slewing portion of various industrial machines, transport machines, construction machines, etc., as shown in FIGS. 10 and 11, three rows of cylinders are provided between an outer ring 1 and an inner ring 2. Three-row cylindrical roller slewing ring bearings incorporating rollers 3, 4, 5 are known. In this bearing, most of the applied load is a thrust load (a partial moment load is also received), and the cylindrical rollers 3 and 4 arranged in the upper row and the lower row are arranged at a constant interval by the segment type cage 16. And retained. As shown in FIG. 12, the retainer 16 has a pair of gentle arcuate side walls 17 having a fixed length between a plurality of columns 18 provided at right angles to the side walls 17, 17.
This pillar 1 is formed by partitioning at regular intervals including both ends.
Cylindrical roller 3 with chamfer 10 in pocket 19 between 8 and 3
Or 4 is stored and held. The cage 16 is arranged in a ring shape between the races 1a and 2a of the outer ring 1 and the inner ring 2 and between the races 1b and 2b by butting a required number of them.
A cylindrical roller 3 or 4 is housed in each pocket 19 to form a three-row cylindrical roller slewing ring bearing. Grease is generally used as a lubricant for this type of bearing.

[0003]

However, the retainer 16
Is assembled between the outer ring 1 and the inner ring 2, and the cylindrical roller 3,
As shown in FIGS. 12 and 13 (a), the column 18 of the cage 16 is provided at right angles to the side walls 17, 17 and in the vertical direction when the 4 is housed. However, as shown in FIG. 13B, the raceway surface 1 of the outer ring 1
a and the raceway surface 2b of the inner ring 2 are contacted. Therefore, on the upper surface side of the cage 16, a space is formed between the raceway surface 2a of the inner ring 2 and the raceway surface 1b of the outer ring 1, but on the lower surface side of the cage 16, the raceway surface 1a of the outer ring 1 or Inner ring 2
When the lubricant is supplied from the outer race 1 and the inner race 2 in the radial direction, a space is not formed between the raceway surface 2b and the raceway surface 2b, and it is difficult for the lubricant to enter the space on the lower surface side in the pocket 19. Therefore, the cylindrical rollers 3 and 4 and the inner surface of the pocket 9, and the cylindrical rollers 3 and 4 and the raceway surface 1a on the lower surface side of the cage,
Rolling contact surfaces such as 2b, the cage 16 and the raceway surface 1
Circulation of the lubricant to the sliding contact surfaces with a and 2b becomes insufficient, and good lubricating performance cannot be obtained. Therefore, surface damage occurs on the rolling contact surface and the sliding contact surface,
Rolling fatigue could shorten the life.

Therefore, an object of the present invention is to smoothly circulate the lubricant into the pockets of the cage to improve the lubricity of the rolling contact surface and the sliding contact surface, thereby realizing a good rolling fatigue life. That is.

[0005]

In order to solve the above problems, the present invention adopts the following configuration.

That is, in a cage for a slewing bearing having a required number of pockets for accommodating rollers, by partitioning a pair of gentle arcuate side walls with columns provided at a predetermined interval, The height is within the diameter of the roller, and a space is formed between the lower surface of the cage and the raceway surface of the bearing.

With this structure, since the height of the side wall of the cage is within the diameter of the roller, a space is formed also on the upper surface side of the cage and the space formed on the lower surface side of the cage. The lubricant is supplied and circulates in the pocket in the radial direction of the bearing from both of the above, so that the contact between the roller and the pocket inner surface, the roller and raceway surface, especially the rolling contact surface of the cage bottom surface side Lubricity of the surface is improved, surface damage at the contact surface is suppressed, rolling fatigue life is prevented from being shortened, and durability of the cage is also improved.

The space can be formed by supporting the cage by the rollers contacting the facing surfaces of the columns inclined in opposite directions so that the pockets are narrowed upward.

According to this structure, the pocket provided with the plurality of rollers supports the cage by contacting the facing surfaces of the pillars which are inclined downward and upward, so that the lower surface side of the cage has the raceway surface of the bearing. A space is formed between and. As a result, the lubricant is supplied and circulated in the pocket from the space on the lower surface side of the cage as well as on the upper surface side of the cage, so that the lubricity of the rolling contact surface is improved.

The space may be formed by supporting the cage by the rollers contacting the facing surfaces of the pillars that are alternately inclined in opposite directions so that the pockets are narrowed upward. it can.

According to this structure, the pillars that are inclined alternately in opposite directions form the partition wall in a taper shape that narrows upward for every other pocket, so that the rollers have a taper shape that narrows upward. The cage supports the cage by contacting the partition wall, and as in the case described above, a space is formed between the lower surface of the cage and the raceway surface of the bearing. Thus, the cage is supported by the rollers for every other pocket, so that the supporting state is stable.

The space is formed by the contact of the rollers with the inclined facing surfaces of the columns whose one surface is inclined and the other surface is vertical so that the pocket is narrowed upward. be able to. By doing so, it is only necessary to incline one of the opposing surfaces of the column, and therefore the formation becomes easy.

The space is formed by supporting the cage by contacting the rollers with the opposing surfaces of the pillars whose both sides are tapered downward so as to narrow the pocket upward. be able to.

With this structure, since the pillar forms the partition wall in a tapered shape that narrows upward in each pocket, the cage supports the cage in each pocket by the rollers.
The supporting state is stable, the contact load between each roller and the cage is reduced, and the contact state is improved.

The space can be formed by a notch provided in the lower portion of the side wall so as to face the raceway surface of the bearing.

Also in this case, a space is formed not only on the upper surface side of the cage but also on the lower surface side of the cage with the raceway surface of the bearing. As a result, as in the case of tilting the column, the lubricant is supplied from the space in the radial direction of the bearing and circulates in the pocket, so that the rolling contact surface, and the lower surface and the raceway surface of the cage. The lubricity of the sliding contact surfaces with and is improved, the surface damage on these contact surfaces is suppressed, the rolling fatigue life is prevented from being shortened, and the durability of the cage is also improved.

Further, since the space can be secured between the lower surface of the cage and the raceway surface only by providing the notch on the lower surface of the cage, that is, the lower surface of the side wall, it is not necessary to incline the column and the cage Easy to form.

It is preferable that the notch is provided in a concave shape at the pocket portion.

With this configuration, from the lower surface side of the cage,
Since the lubricant is reliably supplied into the pocket and the lubricant is filled between the rollers in the pocket and the column, the lubricant circulates also on the sliding contact surface between the side wall and the raceway surface, Not only the rolling contact surface but also the sliding contact surface is lubricated. Thereby, the sliding resistance is reduced and the surface damage is suppressed.

It is desirable that the retainer is a segment type.

The cage described above can be used as a cage for a slewing ring bearing in which rollers are incorporated between the raceways of the outer ring and the inner ring. In particular, it is suitable as a cage for a three-row cylindrical roller slewing bearing incorporating three rows of cylindrical rollers.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying FIGS.

FIGS. 1 and 2 show a three-row cylindrical roller slewing bearing incorporating a cage 6 according to an embodiment of the present invention. Three rows of cylindrical rollers 3, 4 are provided between an outer ring 1 and an inner ring 2. 5,
Is incorporated in the cage. In this bearing, as described above, most of the applied load is a thrust load (a partial moment load can also be received), and the chamfered cylindrical rollers 3 and 4 arranged in the upper row and the lower row are housed. As shown in FIGS. 3 and 4 (a), the cage 6 is of a segment type, and includes a pair of loose arc-shaped side walls 7 having a constant length and both ends thereof. A plurality of columns 8 which are provided at right angles to the side walls 7, 7 and which are alternately inclined in opposite directions in the circumferential direction and are inclined at the same angle are partitioned at regular intervals, and the columns 8 serving as partition walls are provided in a tapered shape with an upper narrowing. The pockets 9 and the pockets 9a in which the pillars 8 are provided in a tapered shape that is narrowed downward are formed alternately and at equal intervals. The cylindrical rollers 3 or 4 are accommodated in the respective pockets 9 and 9a from the wider side between the pillars 8 provided in a tapered shape, and the cylindrical rollers 3 or 4 are provided on the opposite surfaces of the tapered pillars 8 which are narrowed upward in the pocket 9. Contact,
The cage 6 is supported by the cylindrical rollers 3 or 4 for every other pocket 9 and, like the upper surface side of the cage 6, as shown in FIG. 7 between the raceway surface 1a of the outer ring 1 and the raceway surface 2b of the inner ring 2,
A space is formed. The height of the side wall 7 is
It is contained within the diameter of the cylindrical rollers 3 and 4, and a space is formed on the upper surface side of the cage 6.

Since the columns 8 are alternately inclined at the same angle in opposite directions, as shown in FIG. 4 (a), the cylindrical rollers 3 or 4 have the same column 8 in each pocket 9, 9a. Both sides are contacted at different height positions from the raceway surface 1a or 2b and are housed in the pockets 9 and 9a at a uniform height, so that a smooth turning is possible.

In this way, the cage 6, as shown in FIG.
Are arranged annularly between the raceways 1a, 2a, 1b, 2b to form a three-row cylindrical roller slewing bearing.

The pocket 9 is formed from either side of the space formed on the upper surface side of the cage 6 and the space on the lower surface side of the cage 6 formed by alternately inclining the columns 8 as described above. , 9a so that a required amount of lubricant can be supplied and circulated, and the number of pockets provided in one segment is not too small, the inclination angle of the column 8 from the vertical axis is 45 ° or less. It is desirable that within this range,
An appropriate angle can be selected according to the diameters of the cylindrical rollers 3 and 4 and the number of them stored in the cage 6, that is, the number of pockets.

The embodiment of the present invention is configured as described above, and its operation will be described below.

As described above, since a space is also formed on the lower surface side of the cage 6, the lubricant is formed on the upper surface side of the cage 6 especially when the lubricant is supplied from the radial direction of the outer ring 1 and the inner ring 2. The lubricant is circulated in the pockets 9 and 9a from the space on the lower surface side of the cage 6 as well as from the formed space, so that the lubricant circulates in the pockets 9 and 9a. 9a inner surface, cylindrical rollers 3, 4 and raceway surface 1
The lubricity of the rolling contact surface such as a and 2b is improved, the surface damage on the contact surface is suppressed, the rolling fatigue life is prevented from being shortened, and the durability of the cage is also improved.

Further, since the columns 8 are provided so as to be inclined in the directions opposite to each other in the circumferential direction, they are formed on the lower surface side of the cage 6 by the rotation of the cylindrical rollers 3 and 4 at the time of turning. The action of scraping up the lubricant supplied from the space into the pockets 9 and 9a is obtained, and this action improves the circulation of the lubricant in the pockets 9 and 9a, thereby improving the lubricity of the rolling contact surface. To do.

Further, since the cage 6 is formed into a segment having a constant length, the pockets of the cages 6 disposed between the raceways of the outer ring 1 and the inner ring 2 are inclined in the directions in which columns 8 are alternately opposite to each other. It becomes easy to alternately insert the rollers into the 9 and 9a from the upper side and the lower side.

FIG. 5 shows a second embodiment of the present invention in which the pillar 8 is formed with one surface inclined and the other surface vertical, and the inclined surface is narrowed upward. The pocket 9 is formed facing each other, and the other vertical surface is opposed to form the pocket 9b. Even in this case, the cylindrical rollers 3 or 4 contact the inclined surfaces of the columns 8 that are opposed to each other to support the cage 6, and similar to the case shown in FIG. 4B,
A space can be formed between the side wall 7 on the lower surface side of the cage 6 and the raceway surface 1a or 2b. Since it is sufficient to incline only one surface of the pillar 8 facing each other, the formation becomes easier than in the case of inclining both surfaces.

FIG. 6 shows a third embodiment, in which both sides of the pillar 8 are inclined downwardly and narrowed, and the pillars 8 are formed facing each other with pockets 9 narrowed upward. As a result, the cage 6 is supported for each pocket 9 by the cylindrical rollers 3 or 4, the supporting state is stable, and the contact load between the cylindrical rollers 3 and 4 and the cage 6 is reduced, so that the contact state is maintained. Is improved.

FIGS. 7 and 8A and 8B show a retainer 6a according to the fourth embodiment. As in the case of the retainer 6, a pair of gentle arcuate side walls is provided. 7a, 7a
A plurality of pockets 9 are formed by partitioning the columns with columns 8 provided at predetermined intervals. The side walls 7a, 7a
A recessed or trapezoidal notch 11 is provided between the pillars 8 of the lower pockets 9 facing the raceway surface 1a of the outer ring 1, and the same notch 11 is formed on the side walls 7a, 7a. Is provided so as to face the raceway surface 2a of the inner ring 2. A similar notch is provided in the cage arranged between the raceway surface 1b of the outer ring 1 and the raceway surface 2b of the inner ring 2.

By providing such a notch 11 in the lower portion of the both side walls 7a, 7a, not only on the upper surface side of the cage 6, but also on the lower surface side of the cage 6, the raceway surface 1a of the bearing is formed.
And a space is formed between 2a and 2a. As a result, similarly to the case where the pillar 8 is inclined, when the lubricant is supplied particularly from the radial direction of the bearing, the lubricant is also supplied into the pocket 9 from the space formed on the lower surface side of the cage 6. , This lubricant circulates in the pocket 9 and the cylindrical rollers 3 or 4
And inner surface of pocket 9, cylindrical roller 3 or 4 and raceway surface 1
The lubricity of the rolling contact surfaces a, 2a, especially the contact surface with the lower raceway surface 1a is improved. Further, since the lubricant is filled between the cylindrical rollers 3 or 4 and the column 8, the lubrication state of the sliding surface between the lower surface of the cage 6 and the raceway surface 1a is improved, and the sliding resistance is reduced. By these, surface damage on the contact surface is suppressed, rolling fatigue life is prevented from being shortened, and durability of the cage is also improved. Such behavior is the same between the raceway surface 1b of the outer ring 1 and the raceway surface 2b of the inner ring 2.

As shown in FIG. 9, the cage 6a is abutted with a required number of the cages 6a, and the raceway surfaces 1 of the outer ring 1 and the inner ring 2 are joined together.
The three-row cylindrical roller slewing bearing is arranged annularly between a and 2a and between 1b and 2b.

In the above embodiment, the cage and the three-row cylindrical roller slewing bearing using the cage are described, but the cage is also used for other slewing bearings using cylindrical rollers. be able to.

[0037]

As described above, according to the present invention, the pillars provided between the both side walls which are the partition walls of the pockets of the cage are provided.
By alternately arranging them in the circumferential direction and tilting,
Since the pillar forms an upper narrowed pocket, the roller and the pillar contact each other to support the cage, and a space is formed between the lower surface of the cage and the raceway surface of the bearing. It Further, the space between the lower surface of the cage and the raceway surface can be formed by a notch provided in the lower portion of the both side walls so as to face the raceway surface.

In any of these cases, the lubricant is supplied into the pocket from the space formed on the lower surface side of the cage, and the rotation of the rollers causes the lubricant to scrape up. Improves the circulation state, improves the lubricity of the rolling contact surfaces such as the rollers and the pocket inner surface and raceway surface, and the sliding contact surfaces between the lower surface of the cage and the raceway surface, and suppresses surface damage on these contact surfaces. The rolling fatigue life is prevented from being shortened.

By improving such lubricity, a slewing bearing having a good rolling fatigue life can be realized.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a slewing bearing incorporating a cage according to a first embodiment of the present invention.

FIG. 2 is a transverse plan view of the same as above.

FIG. 3 is a perspective view of the same cage.

FIG. 4 (a) is a vertical sectional front view showing a state in which a cylindrical roller is housed in the same cage. FIG. 4 (b) is an enlarged vertical sectional side view of FIG. 4 (a).

FIG. 5 is a vertical cross-sectional front view showing a state where cylindrical rollers are housed in the cage of the second embodiment.

FIG. 6 is a vertical cross-sectional front view showing a state where cylindrical rollers are housed in the cage of the third embodiment.

FIG. 7 is a perspective view of a cage according to a fourth embodiment.

FIG. 8 (a) is a vertical sectional front view showing a state where cylindrical rollers are housed in the cage according to the above embodiment, and FIG. 8 (b) is an enlarged vertical sectional side view of FIG. 8 (a).

FIG. 9 is a cross-sectional plan view of a slewing bearing incorporating a retainer according to a fourth embodiment.

FIG. 10 is a vertical sectional side view of a conventional slewing bearing.

FIG. 11 is a transverse plan view of the same as above.

FIG. 12 is a perspective view of the same cage.

FIG. 13 (a) is a vertical sectional front view showing a state in which cylindrical rollers are housed in the same cage (b) is an enlarged vertical sectional side view of FIG. 13 (a).

[Explanation of symbols]

1 outer ring 2 inner ring 3 cylindrical rollers 4 cylindrical rollers 5 cylindrical rollers 6,6a cage 7,7a Side wall 8 pillars 9, 9a, 9b pockets 10 chamfer 11 notches

Claims (10)

[Claims] 1. A cage for a slewing bearing having a required number of pockets for accommodating rollers by partitioning a pair of gentle arcuate side walls by columns provided at a predetermined interval, wherein A cage for a slewing bearing, wherein the height is within the diameter of the roller, and a space is formed between the lower surface of the cage and the raceway surface of the bearing. 2. The space is formed by supporting the cage by the rollers contacting the facing surfaces of the pillars inclined in opposite directions so that the pockets are narrowed upward. The cage for a slewing bearing according to claim 1, wherein 3. The space is formed by supporting the cage by contacting the rollers with the facing surfaces of the pillars inclined alternately in opposite directions so that the pockets are narrowed upward. The cage for a slewing bearing according to claim 1, wherein: 4. The roller comes into contact with an inclined facing surface of the column in which one surface is inclined and the other surface is vertical so that the space is narrowed upward in the space. The slewing bearing retainer according to claim 1, wherein the retainer is formed by supporting the retainer. 5. The roller is brought into contact with the facing surface of the column, the both surfaces of which are inclined in a tapered shape so that the pocket is narrowed upward so that the pocket is narrowed upward, thereby supporting the cage. The cage for a slewing bearing according to claim 1, wherein the cage is formed. 6. The cage for a slewing bearing according to claim 1, wherein the space is formed by a notch provided in a lower portion of the side wall so as to face a raceway surface of the bearing. 7. The cage for a slewing bearing according to claim 6, wherein the notch is provided in a concave shape between columns facing each other of the pocket. 8. The cage for a slewing bearing according to claim 1, wherein the cage is a segment type. 9. A slewing bearing using the cage according to any one of claims 1 to 8. 10. The slewing bearing according to claim 9, wherein the slewing bearing is a three-row cylindrical roller slewing bearing.