JP2018168988A - Self-aligning roller bearing - Google Patents

Abstract

To provide a self-aligning roller bearing capable of charging grease into retainers.SOLUTION: Set of double-row spherical rollers 4, 4 are respectively assembled between a spherical raceway 5 of an outer ring 2 and double-row raceways 7, 8 of an inner ring 3, and the spherical roller 4 of each row is retained by two retainers 9, 10. Each of the retainers 9, 10 has an inner annular portion 11 positioned at an axial inner side, an outer annular portion 12 positioned at an axial outer side and having a guide face portion 15 guided to the raceways 7, 8 of the inner ring 3, and a plurality of pillar portions 13 disposed between opposed parts of the inner annular portion 11 and the outer annular portion 12. In the retainers 9, 10, the inner annular portions 11 are axially opposed to each other, and through holes 16 extended in a circumferential direction, are formed on guide face portions 15 of the outer annular portions 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a self-aligning roller bearing incorporated in a rotation support portion of various industrial machine devices.

  In general, a large load is applied to the rotating shaft support portion of various industrial machines such as construction machines, steel facilities, and wind power generators. For this reason, self-aligning roller bearings are often used as roller bearings that are capable of receiving radial loads, axial loads in both directions, and composite loads thereof, and that can receive vibration and impact loads (for example, Patent Documents). 1).

  This self-aligning roller bearing includes, for example, an inner ring having a pair of spherical raceways in two rows, an outer ring having a spherical raceway, a double row spherical roller interposed between the spherical raceway of the outer race and both spherical raceways of the inner race, And a pair of cage-shaped cages in which the spherical rollers in each row are equally arranged in the circumferential direction.

  As a pair of cage-type cages, a plurality of column portions are equally arranged in the circumferential direction between a small-diameter annular portion and a large-diameter annular portion arranged concentrically. A pocket is formed on the inner surface surrounded by the small-diameter annular portion, the large-diameter annular portion, and the adjacent column portion of the cage cage, and the inner circumferential surface of the small-diameter annular portion is the inner race both tracks as a guide for the inner race. Are in contact with each other.

  In this self-aligning roller bearing, grease injected from an oil supply hole formed in the outer ring is usually attached to the outer portion of the cage retainer. As the spherical roller rolls, the adhered grease lubricates the interior of the bearing, such as between the spherical roller and the inner and outer ring raceways, and between the spherical roller and the pocket inner surface of the cage cage. doing.

JP 2007-332996 A

  In the self-aligning roller bearing described in Patent Document 1, the pair of squirrel cage retainers includes a large-diameter annular portion that abuts against each other in the axial direction, and an inner peripheral surface of the small-diameter annular portion that serves as an inner ring guide. Each track is in contact.

  For this reason, at the time of initial injection of grease, it can be adhered to the outer portions of the pair of cage-type cages, but it is difficult to inject it into the inside of the bearing.

  Therefore, a problem to be solved by the present invention is to provide a self-aligning roller bearing capable of injecting grease into the cage.

In order to solve the above problems, the present invention includes an outer ring having a spherical track on the inner periphery, an inner ring having a double row track on the outer periphery, a spherical track of the outer ring, and a double row track of the inner ring. A double row spherical roller incorporated between the two, and two cages for holding the spherical roller for each row,
Each retainer has an inner annular portion located on the inner side in the axial direction,
An outer annular portion located on the outside in the axial direction and having a guide surface portion guided by the track of the inner ring;
A plurality of pillars provided between the opposing portions of the inner annular portion and the outer annular portion, and arranged at intervals in the circumferential direction;
Each of the cages is in a state where the inner annular portions thereof are opposed to each other in the axial direction,
A configuration in which the guide surface portion of the inner annular portion or the outer annular portion of each of the cages has an oil passage to the inside of the cage formed by each of the cages and the inner ring can be employed.

  According to this configuration, each retainer has an oil passage to the inside of the retainer in the guide surface portion of the inner annular portion or the outer annular portion. Therefore, when the grease is initially injected, the retainer is passed through the oil passage. Grease can be injected inside.

  Moreover, the grease adhered to the outer portion of each cage can be supplied into the cage through the oil passage.

  It is possible to adopt a configuration in which each of the cages has a through hole in the guide surface portion of the outer annular portion, and the through hole is the oil passage. In this configuration, grease can be supplied from the through hole in the outer annular portion of the cage portion to the inside of the cage.

  Each of the cages has a radial notch that is recessed radially outward at a radially inner edge of the guide surface portion of the outer annular portion, and the radial notch is the oil passage. Can be adopted.

  In this configuration, the grease is supplied into the cage through the radial notch of the guide surface portion of the inner annular portion. Further, the guide surface portion having the radial cutout has a small contact area with the race of the inner ring.

  It is possible to adopt a configuration in which each of the cages has an axial notch that is recessed outward in the axial direction at a facing portion of the inner annular portions facing each other, and the axial notch is the oil passage. .

  In this case, for example, when grease is supplied from an oil supply hole formed in the outer ring, the grease moves inward in the radial direction, and supply from the notch that is an oil passage of the inner annular portion to the inside of the cage is performed. It becomes easy to be done.

  A plurality of the axial cutouts are provided in the circumferential direction with respect to the facing portion of the inner annular portion, and each of the axial cutouts is positioned on the axially inner side of the plurality of column portions. Can be adopted.

  According to this structure, since each axial notch is located in the axial direction inside of the column part, the strength of the cage can be maintained without reducing the strength of the inner annular portion.

  According to the present invention, each retainer can supply grease to the interior of the retainer through the oil passage, so that lubricity between the spherical roller and the inner ring raceway and the outer ring spherical raceway can be improved.

Longitudinal sectional view of the self-aligning roller bearing of the first embodiment according to the present invention Front view of spherical roller bearing An enlarged plan view of a part of the cage Vertical sectional view of the self-aligning roller bearing of the second embodiment Front view of spherical roller bearing Vertical sectional view of the self-aligning roller bearing of the third embodiment An enlarged plan view of a part of the cage

  Hereinafter, a self-aligning roller bearing according to a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the self-aligning roller bearing 1 according to this embodiment includes an outer ring 2, an inner ring 3 disposed inside the outer ring 2, and a spherical roller incorporated between the outer ring 2 and the inner ring 3. 4 and two cages 9 and 10 for holding the spherical rollers 4.

  Here, the “circumferential direction” refers to a circumferential direction around the center axis of the bearing unless otherwise specified. Unless otherwise specified, the direction along the bearing central axis is simply referred to as “axial direction”, and the direction perpendicular to the central axis is simply referred to as “radial direction”.

  The outer ring 2 is composed of an integral annular part. The outer ring 2 has a spherical raceway 5 on the inner periphery, and an oil supply hole 6 penetrating from the outer diameter surface to the spherical raceway 5 is formed. A plurality of oil supply holes 6 are provided in the circumferential direction at the center in the axial direction of the outer ring 2.

  The inner ring 3 is a double-row raceway having two double-row raceways 7 and 8 on the outer periphery, and has no collar. Between each of the tracks 7 and 8 and the spherical track 5 of the outer ring 2, a plurality of spherical rollers 4 arranged at equal intervals in the circumferential direction are incorporated in a double row, and the plurality of spherical rollers 4 for each row are arranged in a cage 9. 10 is held so that it can roll.

  The spherical roller 4 has a generatrix rolling surface that makes point contact with the spherical raceway 5 of the outer ring 2 on a plane including the central axis of the spherical roller 4.

  As shown in FIG. 2, each of the cages 9 and 10 includes an inner annular portion 11 located on the inner side in the axial direction, an outer annular portion 12 located on the outer side in the axial direction, an inner annular portion 11 and an outer annular portion 12. And a plurality of column portions 13 extending between the opposing portions.

  As shown in FIG. 3, each of the cages 9 and 10 has a cage shape having a plurality of pockets 14 formed by the inner annular portion 11, the outer annular portion 12 and the adjacent column portions 13. One spherical roller 4 is accommodated in each pocket 14.

  Each of the inner annular portions 11 of the cages 9 and 10 has end surfaces 11 a that are located radially outside the pitch circle diameter of the inner end surface in the axial direction of the spherical roller 4 and in contact with each other. The end surface 11a is formed in parallel to the radial plane.

  The axially outer surface (side surface opposite to the end surface 11 a) of the inner annular portion 11 is formed in parallel to the axially inner end surface of the spherical roller 4. For this reason, the axially inner end surface of the spherical roller 4 is guided by the axially outer surface of the inner annular portion 11.

  The outer annular portion 12 is formed such that the inner surface in the axial direction is parallel to the outer end surface in the axial direction of the spherical roller 4. The outer annular portion 12 has an annular plate-shaped guide surface portion 15 that extends inward in the axial direction as it extends radially inward on the inner periphery.

  The guide surface portion 15 is formed integrally with the outer annular portion 12 and is guided by the tracks 7 and 8 of the inner ring 3. As shown in FIG. 2, the guide surface portion 15 has a plurality of through holes 16 penetrating in the axial direction.

  The through holes 16 are elongated holes extending in the circumferential direction of the guide surface portion 15 and are arranged at equal intervals in the circumferential direction of the guide surface portion 15. As shown in FIG. 1, the through-hole 16 is located radially inward of the pitch circle diameter of the axially outer end surface of the spherical roller 4, and enters the cage formed by the cages 9 and 10 and the inner ring 3. The oil passage is formed.

  As shown in FIG. 2, the circumferential length L <b> 1 of the through-hole 16 is set to the interval between the column portions 13 and 13 located on both sides in the circumferential direction of the pockets 14 and 14 adjacent in the circumferential direction of the cages 9 and 10. Is done. The interval in the circumferential direction of each through-hole 16 is set based on the standard of the bearing, operating conditions, operating environment, and the like within a range in which the strength of the cages 9 and 10 can be secured.

  Each column 13 has two protrusions 17 and 17 arranged in the axial direction on both side surfaces facing the circumferential direction. The two protrusions 17 respectively oppose the two protrusions 17 and 17 formed on the side surfaces facing the circumferential direction of the adjacent column parts 13 in the circumferential direction.

  The interval between the projecting portions 17 and 17 facing each other in the circumferential direction is set to be smaller than the diameter dimension at the central portion in the length direction of the spherical roller 4, and the spherical roller 4 comes out of the cages 9 and 10 outward in the radial direction. To prevent.

  The self-aligning roller bearing 1 of this embodiment is configured as described above. In the self-aligning roller bearing 1, each of the cages 9 and 10 is incorporated between the outer ring 2 and the inner ring 3 with the inner annular portions 11 facing each other, and the respective end surfaces 11a are mutually connected. In contact. Further, in the assembled state, the guide surface portion 15 of the outer annular portion 12 is guided by the tracks 7 and 8 of the inner ring 3.

  Each inner annular portion 11 of the cages 9 and 10 has a through hole 16 in the guide surface portion 15. For this reason, at the time of initial injection of grease, it is possible to inject grease into the inside of the cage formed by the cages 9 and 10 and the inner ring 3 from the through hole 16 serving as an oil passage.

  In a state where grease is injected into the cage, the spherical roller 4 and the races 7 and 8 of the inner ring 3 and the spherical race 5 of the outer ring 2 or between the spherical rollers 4 and the cages 9 and 10 are operated during operation. Lubricity inside the bearing such as between the inner surface of the pocket 14 can be improved.

  Further, during operation, the through-hole 16 can be used as an oil passage, and the grease adhered to the outer surfaces of the cages 9 and 10 can be guided to the inside of the cage during initial injection. As a result, the lubricity inside the bearing can be maintained for a long period of operation, and the bearing life can be ensured.

  Next, a self-aligning roller bearing according to a second embodiment of the present invention will be described with reference to FIGS. The self-aligning roller bearing 1 of this embodiment is formed at the radially inner edge of the guide surface portion 15 instead of the through hole 16 formed in the guide surface portion 15 of the outer annular portion 12 of the cages 9 and 10. It differs from the above-mentioned first embodiment in that the radial notch 18 is an oil passage. In other configurations, the same configurations as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  Each of the cages 9 and 10 in this embodiment has a radial notch 18 at the radially inner edge of the guide surface portion 15 of the outer annular portion 12. The radial cutouts 18 are formed in the same number as the number of the column portions 13 of the cages 9 and 10 and are arranged at equal intervals in the circumferential direction. Further, the radial cutout 18 is formed to be recessed in an arc shape outward in the radial direction of the guide surface portion 15.

  In this embodiment, each outer annular portion 12 of the cages 9 and 10 has a radial cutout 18 in the guide surface portion 15. For this reason, at the time of initial injection of grease, it is possible to inject grease into the cage from the radial notch 18 serving as an oil passage.

  In a state where grease is injected into the cage, the lubricity inside the bearing can be improved during operation as in the first embodiment. Further, during operation, the radial notch 18 can be used as an oil passage, and the grease adhered to the outer surfaces of the cages 9 and 10 can be guided to the inside of the cage during initial injection.

  A self-aligning roller bearing according to a third embodiment of the present invention will be described with reference to FIGS. In the self-aligning roller bearing 1 of this embodiment, each of the inner annular portions 11 of the cages 9 and 10 is replaced with the through holes 16 formed in the guide surface portion 15 of the outer annular portions 12 of the cages 9 and 10. It differs from the above-mentioned first embodiment in that the axial cutout 19 formed in the end surface 11a is an oil passage. In other configurations, the same configurations as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  Each of the cages 9 and 10 of this embodiment has an axial notch 19 on the end surface 11 a of the inner annular portion 11. The axial notch 19 is located on the inner side in the axial direction of each column portion 13 and is formed in an arc shape outward in the axial direction.

  In this embodiment, each inner annular portion 11 of the cages 9 and 10 has an axial notch 19 on the end surface 11a. For this reason, at the time of initial injection of grease, the grease can be injected into the cage from the axial notch 19 serving as an oil passage.

  In a state where grease is injected into the cage, the lubricity inside the bearing can be improved during operation as in the first embodiment. Further, during operation, the axial notch 19 can be used as an oil passage, and the grease adhered to the outer surfaces of the cages 9 and 10 can be guided into the cage during initial injection.

DESCRIPTION OF SYMBOLS 1 Self-aligning roller bearing 2 Outer ring 3 Inner ring 4 Spherical roller 5 Spherical track 6 Lubrication holes 7, 8 Track 9, 10 Cage 11 Inner annular part 11a End surface 12 Outer annular part 13 Column part 14 Pocket 15 Guide surface part 16 Through hole 17 Protrusion 18 Radial cutout 19 Axial cutout L1 Length

Claims (5)

An outer ring (2) having a spherical raceway (5) on the inner periphery, an inner ring (3) having a double-row raceway (7, 8) on the outer periphery, a spherical raceway (5) of the outer ring (2), and the inner ring ( 3) a double row spherical roller (4) incorporated between each of the double row raceways (7, 8) and two cages (9, 9) holding the spherical roller (4) for each row. 10)
Each retainer (9, 10) has an inner annular portion (11) positioned axially inside,
An outer annular portion (12) having a guide surface portion (15) positioned on the axially outer side and guided by the tracks (7, 8) of the inner ring (3);
A plurality of pillar portions (13) provided between the opposing portions of the inner annular portion (11) and the outer annular portion (12), and arranged at intervals in the circumferential direction;
Each of the cages (9, 10) is in a state where the inner annular portions (11) face each other in the axial direction,
The inner annular portion (11) of each of the cages (9, 10) or the guide surface portion (15) of the outer annular portion (12) is formed by the cage (9, 10) and the inner ring (3). A self-aligning roller bearing having an oil passage to the formed cage.   Each of the cages (9, 10) has a through hole (16) in the guide surface portion (15) of the outer annular portion (12), and the through hole (16) is the oil passage. Spherical roller bearings described in 1.   Each of the cages (9, 10) has a radial notch (18) recessed radially outward at the radially inner edge of the guide surface portion (15) of the outer annular portion (12), The self-aligning roller bearing according to claim 1, wherein the radial notch (18) is the oil passage.   Each of the cages (9, 10) has an axial notch (19) recessed outward in the axial direction at the facing portion (11a) of the inner annular portion (11) facing each other. The self-aligning roller bearing according to claim 1, wherein the notch (19) is the oil passage.   A plurality of the axial notches (19) are provided in the circumferential direction with respect to the facing portion (11a) of the inner annular portion (11), and each of the axial notches (19) is a plurality of the column portions. The self-aligning roller bearing according to claim 4, which is located on the inner side in the axial direction of (13).

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