JP2020159433A - Self-aligning roller bearing - Google Patents

Abstract

To provide a self-aligning roller bearing capable of smoothly supplying a lubricant to a bearing space.SOLUTION: In a self-aligning roller bearing, spherical rollers 4 are respectively incorporated between a spherical raceway 7 of an outer ring 2 and each of raceways 8, 8 of double row of an inner ring 3, the spherical rollers 4 by each row are retained by retainers 5, and a guide ring 6 is disposed between the retainer 5 and the outer ring 2. The outer ring 2 has an oil hole 9, and an opening portion 9a of the oil hole 9 is disposed between rows of the spherical rollers 4 by each row, of the spherical raceway 7. A plurality of recessed portions 13 are formed on an outer peripheral face of the guide ring 6, and the plurality of recessed portions 13 are composed of first recessed portions 14 reaching a first outer side face 6a directing one side in an axial direction of the guide ring 6, and second recessed portions 15 reaching a second outer side face 6b directing the other side in the axial direction, of the guide ring 6, the fist recessed portions 14 and the second recessed portions 15 are alternately arranged in the circumferential direction, and the recessed portions 13 of the guide ring 6 are positioned at a radial inner side of the opening portion 9a of the oil hole 9.SELECTED DRAWING: Figure 1

Description

The present invention relates to a self-aligning roller bearing used for a rotating shaft support portion of various industrial machinery such as construction machinery, steel equipment, and wind power generators.

In general, a large load is applied to the rotating shaft support portion of various industrial machinery such as construction machinery, steel equipment, and wind power generators. For this reason, self-aligning roller bearings, which have a high load capacity and can receive vibration and impact loads, are used.

As this self-aligning roller bearing, a double-row spherical roller interposed between an inner ring having a pair of two-row spherical orbits, an outer ring having a spherical orbit, and a spherical orbit of the outer ring and a spherical orbit of each row of the inner ring. A pair of cage-shaped cages that hold the spherical rollers of each row in the circumferential direction, and a guide ring located on the outer ring side between the spherical rollers of each row, and the guide wheels are provided with the spherical rollers of each row and Those that guide a pair of cages are known (see Patent Document 1).

The self-aligning roller bearing described in Patent Document 1 is provided at the center of the outer ring in the axial direction and has a plurality of oil holes penetrating in the radial direction. Lubricant is supplied from the oil holes to the bearing space formed between the inner ring and the outer ring. The lubricant lubricates between the spherical trajectories of the inner and outer rings and the spherical rollers, and between the cage and the spherical rollers.

Jikkai Sho 55-152819

However, in the self-aligning roller bearing described in Patent Document 1, the oil hole has an opening in the spherical track of the outer ring, and the guide ring covers the opening. Therefore, when the lubricant is supplied from the oil hole to the bearing space, the inflow of the lubricant is blocked by the guide wheel, and the amount of the lubricant supplied to the bearing space is reduced.

Therefore, an object to be solved by the present invention is to provide a self-aligning roller bearing capable of smoothly supplying a lubricant to the bearing space.

In order to solve the above problems, the present invention presents an outer ring having a spherical orbit on the inner circumference, an inner ring having a double-row orbit on the outer periphery, and a spherical orbit of the outer ring and a double-row orbit of the inner ring. A guide located radially outside the cage between the rows of spherical rollers of each row, the cage that holds the spherical rollers of each row, and the spherical rollers of each row. In a self-aligning roller bearing including a ring, the outer ring has an oil hole penetrating the outer peripheral portion and the inner peripheral portion thereof, and the oil hole has an opening provided in a spherical orbit of the outer ring. The portions are located between the rows of spherical rollers in each row, and the guide ring has a first outer surface facing one axial direction and a second outer surface facing the other in the axial direction. The outer peripheral portion has a plurality of recesses extending outward in the axial direction, the plurality of recesses are in a state of reaching at least one of the first outer surface and the second outer surface, and the recess of the guide ring is the oil hole. It is possible to adopt a configuration in which the opening is located inside in the radial direction.

In this configuration, the plurality of recesses on the outer peripheral portion of the guide ring and the spherical trajectory of the outer ring form a passage that opens to at least one of the first outer surface and the second outer surface of the guide ring. Since the recess of the guide ring is located inside the opening of the oil hole in the radial direction, the oil hole and the passage are connected to each other.

In this configuration, the plurality of recesses are composed of a first recess and a second recess, the first recess reaches the first outer surface, and the second recess reaches the second outer surface. A certain configuration can be adopted.

In this configuration, the first recess and the second recess of the guide ring and the spherical trajectory of the outer ring form a passage that opens to the first outer surface of the guide ring and a passage that opens to the second outer surface of the guide ring, respectively. Will be done.

When the plurality of recesses are composed of a first recess and a second recess, a configuration in which the first recess and the second recess are alternately arranged along the circumferential direction can be adopted.

In this case, the passages open to the first outer surface of the guide wheel and the passages open to the second outer surface of the guide wheel are alternately arranged in the circumferential direction. Therefore, the lubricant can be supplied evenly to both sides of the guide wheel in the axial direction.

In the above configuration, a configuration in which each of the recesses reaches the first outer surface and the second outer surface can be adopted.

In this configuration, the recesses of the guide wheels and the spherical trajectories of the outer rings form open passages on the first outer surface and the second outer surface of the guide wheels.

In the present invention, the concave portion of the guide ring and the spherical trajectory of the outer ring form a passage that opens on the outer surface in the axial direction of the guide ring. Lubricant is supplied from the oil hole to the outside in the axial direction of the guide wheel through the passage, and the lubricant can be smoothly supplied to the bearing space.

Longitudinal sectional view of the self-aligning roller bearing of the first embodiment according to the present invention. (A) Vertical sectional view of the same guide wheel, (b) Enlarged side view of a part of the same guide wheel, (c) Enlarged plan view of a part of the same guide wheel. Enlarged perspective view of a part of the cage and guide wheel as above A plan view of the same cage as seen from the inside in the radial direction to the outside in the radial direction. (A) A vertical sectional view of another form of the guide wheel of the same as above, (b) an enlarged side view of a part of the other form of the guide wheel of the same as above, (c) a part of another form of the guide wheel of the same as above. Enlarged plan view Longitudinal sectional view of the self-aligning roller bearing of the second embodiment according to the present invention. (A) Vertical sectional view of the same guide wheel, (b) Enlarged side view of a part of the same guide wheel, (c) Enlarged plan view of a part of the same guide wheel. A plan view of the same cage as seen from the inside in the radial direction to the outside in the radial direction. (A) A vertical sectional view of another form of the guide wheel of the same as above, (b) an enlarged side view of a part of the other form of the guide wheel of the same as above, (c) a part of another form of the guide wheel of the same as above. Enlarged plan view

Hereinafter, the self-aligning roller bearing according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 4. The self-aligning roller bearing 1 of this embodiment has an outer ring 2 having a spherical track 7 on the inner peripheral portion, an inner ring 3 having a double row track 8 on the outer peripheral portion, and a spherical track 7 and an inner ring 3 of the outer ring 2. A double-row spherical roller 4 incorporated between each of the two double-row orbits 8, a cage 5 for holding the spherical roller 4 for each row, and a holder for holding the spherical roller 4 for each row between rows. It is provided with a guide wheel 6 located radially outside the vessel 5.

Here, the "circumferential direction" refers to the circumferential direction around the central 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 "diameter direction".

The outer ring 2 is made of an integral annular part. The outer ring 2 has a single spherical orbit 7 formed on the inner peripheral portion. The spherical track 7 has a shape along a spherical surface having a predetermined radius of curvature from a point on the central axis of the bearing (see the alternate long and short dash line in FIG. 1).

The outer ring 2 has an oil hole 9 penetrating the outer peripheral portion and the inner peripheral portion. The oil hole 9 has a circular opening 9a provided in the spherical track 7 of the outer ring 2. The opening 9a is located between the rows of spherical rollers 4 for each row. Oil holes 9 are provided at a plurality of locations in the circumferential direction of the outer ring 2. The oil holes 9 may be provided at only one location with respect to the outer ring 2.

The inner ring 3 is a double-row track ring having two double-row tracks 8 and 8 on the outer peripheral portion. Each of the orbits 8 and 8 has a shape along a spherical surface having the same radius of curvature.

The outer peripheral portion of the inner ring 3 has flange portions 3a and 3a at both ends in the axial direction. The axially outer end surface of the flange portion 3a is located on the same plane as the axially outer end surface of the inner ring 3. The axially inner end face of the flange portion 3a is parallel to the axially outer end face of the spherical roller 4.

The spherical roller 4 has a bus-shaped rolling surface 4a that makes point contact with the spherical orbit 7 of the outer ring 2 in a plane including the central axis of the roller. The spherical rollers 4 are incorporated in a double row at intervals in the circumferential direction between the spherical orbit 7 of the outer ring 2 and the orbit 8 of the inner ring 3. The spherical rollers 4 incorporated in each row are rotatably held by the cage 5.

The cage 5 has an annular annular portion 10 located between two rows of spherical rollers 4 and a plurality of pillar portions 11 extending axially outward from the annular portion 10. The outer surfaces 10a and 10a of the annular portion 10 in both axial directions face the roller end surfaces 4b on the inner side in the axial direction of the two rows of spherical rollers 4. The outer side surface 10a is parallel to the end surface 4b and is in contact with each other.

As shown in FIG. 3, a plurality of pillar portions 11 are arranged on the outer side surfaces 10a and 10a of the annular portion 10 at equal intervals in the circumferential direction. The plurality of pillars 11 extending from one outer surface 10a of the annular portion 10 and the plurality of pillars 11 extending from the other outer surface 10a of the annular portion 10 are the same number and have a half-circumferential phase. The pitch is off.

The cage 5 has a plurality of pockets 12 formed by an annular portion 10 and adjacent pillar portions 11. Each pocket 12 houses one spherical roller 4. The inner surfaces of the adjacent pillars 11 and 11 facing the circumferential direction are formed in a spherical shape along the rolling surface 4a of the spherical roller 4.

Further, the inner surfaces of the adjacent pillars 11 and 11 facing the circumferential direction have an arcuate cross-sectional shape on a plane passing through the roller central axis of the spherical roller 4. The radius of this arc is the same as the arc of the rolling surface 4a of the spherical roller 4 which is the cross-sectional shape of the rolling surface 4a in a plane passing through the roller center axis.

The cage 5 can hold the spherical roller 4 by the inner surface of the adjacent pillars 11 facing the circumferential direction. The cage 5 is a comb-shaped cage that is guided by a spherical roller 4 and has a rolling element guidance type.

The guide ring 6 is an annular member arranged between the rows of spherical rollers 4 for each row and between the annular portion 10 of the cage 5 and the outer ring 2. As shown in FIG. 2, the guide wheel 6 has a first outer surface 6a facing one axial direction and a second outer surface 6b facing the other axially. The first outer surface 6a and the second outer surface 6b face the roller end surface 4b on the inner side in the axial direction of the spherical rollers 4 in each row.

As shown in FIG. 3, recesses 13 recessed inward in the radial direction are formed at equal intervals in the circumferential direction on the outer peripheral portion of the guide wheel 6. Each recess 13 is composed of a first recess 14 extending outward in the axial direction and reaching the first outer surface 6a, and a second recess 15 reaching the second outer surface 6b.

As shown in FIG. 4, the width dimension of each recess 13 in the circumferential direction is the same as the diameter (width dimension in the circumferential direction) of the opening 9a of the oil hole 9. The maximum axial width dimension of each recess 13 is larger than the diameter (width dimension in the circumferential direction) of the opening 9a of the oil hole 9. The first recess 14 and the second recess 15 are alternately arranged along the circumferential direction.

The other edge of the first recess 14 in the axial direction has a semicircular shape having the same radius as the opening 9a of the oil hole 9. When the first recess 14 is located inside the opening 9a of the oil hole 9 in the radial direction, the other edge of the first recess 14 in the axial direction coincides with the opening 9a of the oil hole 9.

In this state, the first recess 14 and the spherical orbit 7 of the outer ring 2 located between the rows of the spherical rollers 4 for each row form a passage 30 that opens to the first outer surface 6a of the guide ring 6 (FIG. 2 (b)).

The second recess 15 has a semicircular shape in which one edge in the axial direction has the same radius as the opening 9a of the oil hole 9. In a state where the second recess 15 is located inside the opening 9a of the oil hole 9 in the radial direction, one edge of the second recess 15 in the axial direction coincides with the opening 9a of the oil hole 9.

In this state, the second recess 15 and the spherical track 7 of the outer ring 2 located between the rows of the spherical rollers 4 for each row form a passage 30 that opens to the second outer surface 6b of the guide ring 6.

In this embodiment, the passage 30 is formed by the first recess 14 and the second recess 15 of the guide ring 6. When the passage 30 and the oil hole 9 are connected, the lubricant supplied from the oil hole 9 passes through the passage 30 and flows out to the outside in the axial direction of the guide wheel 6. As a result, the lubricant can be smoothly supplied to the bearing space.

In each recess 13 of the guide wheel 6, the first recess 14 and the second recess 15 may be arranged every two or every three. Further, the first recess 14 and the second recess 15 may be randomly arranged.

Further, the width dimension of the concave portion 13 in the circumferential direction may be larger than the diameter (width dimension in the circumferential direction) of the opening 9a of the oil hole 9.

Further, as shown in FIG. 5, for example, the plurality of recesses 13 formed in the outer peripheral portion of the guide ring 6 reach both the first outer surface 6a and the second outer surface 6b of the guide ring 6. You may. A passage opened to the first outer surface 6a and the second outer surface 6b of the guide ring 6 by the respective recesses 13 shown in FIG. 5 and the spherical orbit 7 of the outer ring 2 located between the rows of the spherical rollers 4 for each row. 31 is formed.

By connecting the passage 31 and the oil hole 9, the lubricant supplied from the oil hole 9 passes through the passage 31 and flows out to the outside in the axial direction of the guide wheel 6. As a result, the lubricant can be smoothly supplied to the bearing space.

Next, the self-aligning roller bearings according to the second embodiment of the present invention are shown in FIGS. 6 to 8. The second embodiment is different from the above-described first embodiment in that the inner ring 3 does not have a flange portion 3a on the outer peripheral portion and the cage 5 is a pair of cage-type cages 20 and 20. In other configurations, those considered to be the same as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 6, the inner ring 3 of this embodiment does not have flanges at both ends in the axial direction, and the raceways 8 and 8 reach the bearing end faces.

The pair of cage-type cages 20 and 20 have the same configuration, and the direction of incorporation into the self-aligning roller bearing 1 is only opposite in the axial direction. Therefore, only the cage 20 incorporated on one side in the axial direction will be described.

A plurality of cages 20 are arranged between the inner annular portion 21 located on the inner side in the axial direction, the outer annular portion 22 located on the outer side in the axial direction, and the opposing portion between the inner annular portion 21 and the outer annular portion 22. It is a cage-type cage having a pillar portion 23.

The cage 20 has a plurality of pockets 24 formed by an inner annular portion 21, an outer annular portion 22, and adjacent pillar portions 23, 23. Each pocket 24 houses one spherical roller 4 (see FIG. 8).

The axially outer surface of the inner annular portion 21 is formed parallel to the axially inner roller end surface 4b of the spherical roller 4. The axial inner surface of the outer annular portion 22 is formed parallel to the axially outer roller end surface of the spherical roller 4. The outer annular portion 22 extends radially inward with respect to the pillar portion 23. The inner peripheral portion of the outer annular portion 22 is radially opposed to and in contact with the orbit 8 of the inner ring 3.

The guide ring 6 is arranged between each inner annular portion 21 of the pair of cages 20 and the spherical track 7 of the outer ring 2. Similar to the first embodiment, recesses 13 recessed inward in the radial direction are formed on the outer peripheral portion of the guide wheel 6 at equal intervals in the circumferential direction.

Each recess 13 is composed of a first recess 14 that extends outward in the axial direction and reaches the first outer surface 6a of the guide wheel 6, and a second recess 15 that reaches the second outer surface 6b. The first recess 14 and the second recess 15 are alternately arranged along the circumferential direction.

As shown in FIGS. 7 and 8, in a state where the first recess 14 is located inside the opening 9a of the oil hole 9 in the radial direction, the guide ring 6 is formed by the first recess 14 and the spherical track 7 of the outer ring 2. A passage 30 open to one outer surface 6a is formed.

Further, when the second recess 15 is located inside the opening 9a of the oil hole 9 in the radial direction, the second recess 15 and the spherical track 7 of the outer ring 2 open the second recess 15 to the second outer surface 6b of the guide ring 6. A passage 30 is formed.

In this embodiment, the passage 30 is formed by the first recess 14 and the second recess 15 of the guide ring 6. When the passage 30 and the oil hole 9 are connected, the lubricant supplied from the oil hole 9 passes through the passage 30 and flows out to the outside in the axial direction of the guide wheel 6. As a result, the lubricant can be smoothly supplied to the bearing space.

Further, in this embodiment, as shown in FIG. 9, for example, the recess 13 formed in the outer peripheral portion of the guide ring 6 reaches both the first outer surface 6a and the second outer surface 6b of the guide ring 6. It may be a thing. Each recess 13 shown in FIG. 9 and the spherical track 7 of the outer ring 2 form a passage 31 that opens to the first outer surface 6a and the second outer surface 6b of the guide ring 6.

1 Self-aligning roller bearing 2 Outer ring 3 Inner ring 4 Spherical roller 4a Rolling surface 4b Roller end surface 5, 20 Cage 6 Guide ring 6a First outer surface 6b Second outer surface 7 Spherical track 8 Track 9 Oil hole 9a Opening 10 Circular portion 10a Outer side surface 11 Pillar portion 13 Recessed portion 14 First concave portion 15 Second concave portion 21 Inner annular portion 22 Outer annular portion 23 Pillar portion 30, 31 Passage

Claims (4)

An outer ring (2) having a spherical orbit (7) on the inner circumference, an inner ring (3) having a double-row orbit (8) on the outer circumference, and a spherical orbit (7) and the inner ring (7) of the outer ring (2). A double-row spherical roller (4) incorporated between each of the double-row orbits (8) of 3), a cage (5) for holding the spherical roller (4) for each row, and the row. In a self-aligning roller bearing provided with a guide ring (6) located radially outside the cage (5) between rows of each spherical roller (4).
The outer ring (2) has an oil hole (9) penetrating the outer peripheral portion and the inner peripheral portion thereof, and the oil hole (9) is provided in the spherical orbit (7) of the outer ring (2). ), And the opening (9a) is located between the rows of spherical rollers (4) for each row.
The guide ring (6) has a first outer surface (6a) facing one axial direction and a second outer surface (6b) facing the other axial direction, and the outer peripheral portion of the guide ring (6) has an axial direction. It has a plurality of recesses (13) extending outward and has a plurality of recesses (13).
The plurality of recesses (13) are in a state of reaching at least one of the first outer surface (6a) and the second outer surface (6b), and the recesses (13) of the guide ring (6) are the oil holes (9). ) Spherical roller bearing characterized in that it is located inside the opening (9a) in the radial direction. The plurality of recesses (13) are composed of a first recess (14) and a second recess (15), and the first recess (14) reaches the first outer surface (6a). The self-aligning roller bearing according to claim 1, wherein the recess (15) reaches the second outer surface (6b). The self-aligning roller bearing according to claim 2, wherein the first recesses (14) and the second recesses (15) are alternately arranged along the circumferential direction. The self-aligning roller bearing according to claim 1, wherein each of the recesses (13) reaches the first outer surface (6a) and the second outer surface (6b).

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