JP2007278494A - Guide ring for self-aligning roller bearing, and self-aligning roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel guide ring for a self-aligning roller bearing, and the self-aligning roller bearing attaining a long service life even when used under high speed rotation and high load. <P>SOLUTION: In the guide ring 5 for the self-aligning roller bearing, a surface hardened layer 6 formed of a shot-peening layer, a DLC layer, a ceramic layer, or the like is formed at each of both axial end faces 5c coming in sliding contact with a roller 3. The hardness of the sliding contact surfaces 5a-5c thereby becomes high, and a coefficient of sliding friction becomes small. As a result, the service life of the self-aligning roller bearing can be improved even when used under high speed rotation and high load. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a self-aligning roller shaft used for various machines, for example, industrial machines such as steel and paper, and a bearing guide wheel constituting the same.

A self-aligning roller bearing used in a roll section or the like of a papermaking machine includes an inner ring having a double-row raceway surface on an outer peripheral surface, and an outer ring having a spherical raceway surface facing the raceway surface of the inner ring on the inner peripheral surface, And a plurality of rollers arranged to be freely rollable between the double-row raceway surfaces of the inner ring and the outer ring.
In such a self-aligning roller bearing, in many cases, guide wheels for guiding the axial end surfaces of the rollers are arranged between the roller rows so that the double row rollers can roll without skew. It has been broken.

  However, when a self-aligning roller bearing is used under high speed rotation or high load, sliding friction increases on the sliding contact surface between the guide wheel and other rolling parts (inner ring, outer ring, roller, cage, etc.). Heat generation, wear, and abnormal noise may occur, or wear life may reduce grease life. That is, in order to extend the life of the self-aligning roller bearing under high speed rotation and high load, it is necessary to reduce the sliding friction associated with the installation of the guide wheels.

Therefore, as a technique for reducing sliding friction associated with the installation of guide wheels, a technique for guiding rollers with a cage without installing guide wheels (see Patent Documents 1 to 3) and a configuration of guide wheels are devised. Have been proposed (see Patent Documents 4 to 7) or a technique for processing a sliding portion (see Patent Documents 7 and 8).
In Patent Document 1, it is proposed that a cage having a roller guide surface is prepared for each roller row, and the axial end surfaces of adjacent cages are arranged in contact with each other.

Patent Document 2 proposes that a cage having a roller guide surface is prepared for each roller row, and at least a part of each cage is disposed in contact with the outer ring raceway surface.
In Patent Document 3, a cage having a roller guide surface and having a ring portion on the large-diameter side edge (axial center portion) of the inner ring raceway surface is prepared for each roller row, and the ring portion of the cage is prepared. It has been proposed to arrange the rollers so that they contact at three points, the inner ring raceway surface and the outer ring raceway surface.

In Patent Document 4, it is proposed that the guide wheel is provided with a biasing means for biasing the double row rollers in a direction in which the rollers are separated from each other.
In Patent Document 5, it is proposed that the guide wheel is formed of a synthetic resin containing a lubricating component.
In Patent Document 6, a diamond-like carbon layer or a ceramic layer is formed on a base material made of magnesium, aluminum, an alloy of magnesium and aluminum, steel or the like, plastic, rubber, ceramics, or a composite material thereof. There has been proposed a method in which a hardened surface layer made of is closely adhered.

In Patent Document 7, the seal groove 12a of the sealed rolling bearing 10 provided with the sealing device 20 is subjected to shot peening as disclosed in Patent Document 8 to prevent foreign matters from being mixed and the seal groove. A technique is disclosed in which the lubrication state of the portion 12a is satisfactorily maintained over a long period of time.
JP 2000-81036 A JP 2001-165158 A JP 2004-19731 A JP 2001-82467 A JP-A-2005-24026 JP 2003-147525 A JP 2005-69404 A Japanese Patent No. 3357661

In recent years, self-aligning roller bearings have been required to have a longer life under high-speed rotation and high load.
However, in the techniques described in Patent Documents 1 to 3, poor lubrication may occur on each sliding contact surface with the cage, and it may be difficult to sufficiently reduce sliding friction.
On the other hand, the techniques described in Patent Documents 4 to 8 described above have room for further improvement in terms of reducing sliding friction on each sliding contact surface between the guide wheel and other rolling parts.
Therefore, the present invention has been devised to solve such problems, and its purpose is to achieve a long life even when used under high-speed rotation or high load. The present invention provides a novel guide roller for a self-aligning roller bearing and a self-aligning roller bearing capable of achieving the above.

In order to solve the above-mentioned problem, the invention of claim 1
An inner ring having a double-row raceway surface on the outer peripheral surface, an outer ring having a spherical raceway surface facing the raceway surface on the inner peripheral surface, and a plurality of rolls disposed between the double-row raceway surfaces in a freely rotatable manner. In a guide wheel that is used in a self-aligning roller bearing provided with rollers and is arranged between rows of the rollers to guide the rollers, at least a part of a sliding contact surface with other rolling parts A guide roller for a self-aligning roller bearing, wherein a hardened surface layer that reduces a friction coefficient is formed.

In this way, the surface hardened layer that reduces the coefficient of friction is formed on at least a part of the sliding contact surface between the guide wheel and other rolling parts (inner ring, outer ring, roller, cage, etc.). Since the sliding contact surface on which the hardened layer is formed has a high hardness and a low sliding friction coefficient, the sliding friction associated with the installation of the guide wheel can be reduced.
Therefore, by using this guide roller for spherical roller bearings, it is possible to prevent wear, heat generation, abnormal noise and shortening of grease life due to the installation of the guide wheel, so it can be used under high speed rotation and high load. The life of spherical roller bearings can be increased.

Further, on the sliding contact surface on which the hardened surface layer is formed, wear and damage are less likely to occur during assembly and rotation of the bearing, and torque and heat generated at the start of rotation can be reduced.
Here, as the surface hardened layer in the present invention, a surface hardened layer having a predetermined depth (for example, a depth from the surface of 10 to 100 μm) by a hardening heat treatment such as a known carburizing treatment, carbonitriding treatment, or nitrosulphurizing treatment Further, a shot peening layer formed by shot peening treatment as shown in claims 2 to 4 below or a known diamond-like carbon layer shown in claim 5 below (hereinafter referred to as “ Abbreviated as “DLC layer”) or a ceramic layer shown in claim 6 below, by coating with a predetermined depth (for example, the depth from the surface is 0.5 to 10 μm, more preferably 1 to 4 μm). A surface hardened layer may be formed. In particular, in consideration of further improving the wear resistance, it is preferable to form a shot peening layer, a DLC layer, or a ceramic layer as a surface hardened layer that reduces the friction coefficient.

The invention of claim 2
The guide roller for a self-aligning roller bearing according to claim 1, wherein the hardened surface layer is a shot peening layer formed by shot peening treatment, and the maximum roughness of the surface of the shot peening layer is 2.5 µm or less. It is a guide wheel for a self-aligning roller bearing characterized by being.
According to such a configuration, since the surface has a surface texture in which minute irregularities are uniformly dispersed, the lubricating oil is held in the recesses of the irregularities, so that a fluid film is formed.

As a result, it is possible to prevent metal contact between the sliding contact surfaces of the guide wheels and the rolling parts, and it is possible to prevent wear due to an increase in compressive residual stress due to shot peening.
Furthermore, since friction on the sliding contact surfaces can be reduced, heat generation can be reduced.
Holding the lubricating oil in the recess also has the effect of eliminating the oil film breakage on the sliding contact surface between the guide wheel and the rolling part, so that the lubricating condition between the guide wheel and the rolling part is improved over a long period of time. Can be maintained.

Holding the lubricating oil in the recess also has the effect of eliminating the oil film breakage on the sliding contact surface between the guide wheel and the rolling part, so that the lubricating condition between the guide wheel and the rolling part is improved over a long period of time. Can be maintained.
In consideration of the effect of retaining the lubricating oil in the recesses in this way, it is desirable that the maximum roughness of the surface be at least “0.5 μm” or more, more preferably “1.0 μm” or more. On the other hand, if the surface roughness is too large, the surface becomes non-uniform and the frictional resistance increases.

The invention of claim 3
The guide wheel for a self-aligning roller bearing according to claim 2, wherein the shot peening layer has a surface hardness of Hv800 or more.
As a result, even if foreign matter enters the sliding contact surface between the guide wheel and the rolling part, the sliding contact surface is not damaged or worn, and stable performance can be ensured.

The invention of claim 4
The self-aligning roller bearing guide ring according to any one of claims 2 and 3, wherein a film in which a solid lubricant is dispersed is formed on a surface of the shot peening layer. It is a guide wheel for a center roller bearing.
Thereby, the metal contact of the sliding contact surface of a guide wheel and rolling components can be prevented more reliably. In particular, an excellent effect can be exhibited under the condition of running out of lubricating oil or in a non-lubricated environment.

Here, as a method of forming a coating film in which a solid lubricant is dispersed on the surface of a shot peening layer as in the present invention, for example, as proposed in Patent Document 8, a spray powder used for shot peening treatment is used. As a mixture of solid lubricant particles such as molybdenum disulfide (MoS ₂ ), tungsten disulfide (WS ₂ ), boron nitride (BN), and fluororesin (for example, PTFE), In addition, it is possible to easily form a film in which the solid lubricant is uniformly dispersed on the surface of the shot peening layer only by performing the shot peening treatment.

The invention of claim 5
2. A guide wheel for a self-aligning roller bearing according to claim 1, wherein the hardened surface layer is a diamond-like carbon layer.
Thereby, since the hardness of the sliding contact surface in which this hardened surface layer is formed is high and the sliding friction coefficient is small, the sliding friction accompanying the installation of the guide wheel can be reduced.

  Further, this DLC layer has a sliding friction coefficient as small as 0.1 or less as compared with a conventional hardened surface layer, and can be formed at a low processing temperature (for example, 200 ° C. or less). Therefore, when a DLC layer is formed as a hardened surface layer, the material of the guide ring (particularly in the vicinity of the sliding contact surface) is not easily affected by heat during the formation of the layer. Even when a high-alloy steel such as speed steel, which has been quenched and tempered, has an advantage that the hardness after quenching and tempering can be maintained. This advantage makes it possible to maintain the bearing performance characteristics because the bearing shape and the bearing gap at the initial design are hardly changed.

The invention of claim 6
2. A guide wheel for a self-aligning roller bearing according to claim 1, wherein the hardened surface layer is a ceramic layer.
Thereby, since the hardness of the sliding contact surface in which this hardened surface layer is formed is high and the sliding friction coefficient is small, the sliding friction accompanying the installation of the guide wheel can be reduced.
Moreover, this ceramic layer has the advantage that hardness and a friction coefficient can be changed with the kind etc. of the alloy which forms this layer.

Here, the material for forming the ceramic layer is not particularly limited, but specific examples include TiN (hardness Hv 2000 to 2400, friction coefficient 0.40 to 0.45), TiCN ( Hardness Hv 3000-3500, friction coefficient 0.12-0.15), TiAlN (hardness Hv 2300-2800, friction coefficient 0.3-0.4), TiC (hardness Hv 3000-3500, friction coefficient 0 .40 to 0.45), CrN (hardness Hv 2000 to 2200, friction coefficient 0.25 to 0.35), TiC / TiN, TiC / TiCN / Al ₂ O ₃ , TiC / Al ₂ O ₃ / TiN, the ceramic layer and the like having a laminated structure such as TiC / TiCN / TiC / Al2O3.

In particular, ceramic layers such as TiN, TiAlN, and TiCN, ceramic layers having a laminated structure including these, and ceramic layers such as CrN have high hardness, low friction coefficient, and high adhesion. Wear and damage can be effectively prevented.
Among these, ceramic layers such as TiN and TiC / TiN are excellent in terms of wear resistance and peel resistance. Similarly, a ceramic layer having a laminated structure such as TiC / TiCN / Al ₂ O ₃ , TiC / Al ₂ O ₃ / TiN, TiC / TiCN / TiC / Al ₂ O ₃ has a point of wear resistance and adhesion prevention. Is excellent. Furthermore, a ceramic layer such as CrN is excellent in terms of corrosion resistance, oxidation resistance, and seizure resistance.

The invention of claim 7
An inner ring having a double-row raceway surface on the outer peripheral surface, an outer ring having a spherical raceway surface facing the raceway surface on the inner peripheral surface, and a plurality of rolls disposed between the double-row raceway surfaces in a freely rotatable manner. A self-aligning roller bearing comprising a roller and a guide wheel disposed between the rows of the rollers to guide the roller, wherein the guide wheel is any one of claims 1 to 6. A self-aligning roller bearing, characterized by being a guide wheel for the self-aligning roller bearing described in 1.

According to this, if only the guide wheel is replaced in the conventional self-aligning roller bearing, the sliding friction associated with the installation of the guide wheel can be reduced, so that the production speed can be reduced without significantly increasing the manufacturing cost. And the life of spherical roller bearings used under heavy loads can be improved.
Furthermore, in addition to the sliding contact surface with the other rolling parts in the guide wheel, the hardened surface layer is formed on each sliding contact surface with the cage and each sliding contact surface between the cage and the raceway. Also good. Thereby, the sliding friction accompanying installation of a cage can also be reduced.

According to the present invention, the surface hardened layer that reduces the friction coefficient is formed on at least a part of the sliding contact surface with other rolling parts (inner ring, outer ring, roller, cage, etc.). Since the sliding contact surface on which the hardened layer is formed has a high hardness and a low sliding friction coefficient, the sliding friction associated with the installation of the guide wheel can be reduced.
Therefore, by using this guide wheel, it is possible to prevent wear, heat generation, abnormal noise and reduction in grease life associated with the installation of the guide wheel. Therefore, self-aligning rollers used under high speed rotation and high load The life of the bearing can be extended.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1 is a sectional view showing an example of a self-aligning roller bearing according to the present invention.
As shown in FIG. 1, this self-aligning roller bearing has an inner ring 1 having a double row raceway surface 1a on the outer peripheral surface and a spherical raceway surface 2a facing the raceway surface 1a of the inner ring 1 on the inner peripheral surface. An outer ring 2 and a plurality of rollers 3 arranged so as to roll between the double-row raceway surfaces 1a and 2a are provided.

The roller 3 of this self-aligning roller bearing is held by a roller 4 having a substantially L-shaped cross section so that it can roll for each roller row. A ring-shaped guide wheel 5 is arranged between the axial center portion 1 b on the outer peripheral surface of the inner ring 1 and the inner peripheral surface of the cage 4.
The guide wheel 5 has an inner peripheral surface (sliding contact surface) 5 a in sliding contact with the axial central portion 1 b on the outer peripheral surface of the inner ring 1, and an outer peripheral surface (sliding contact surface) 5 b within each of the two cages 4. A part of the circumferential surface is in sliding contact, and both axial end surfaces (sliding contact surfaces) 5 c are in sliding contact with the axial end surface of the roller 3.

A shot peening layer (surface hardened layer) 6 formed by a shot peening process such as WPC (registered trademark) as described above is formed on both end faces 5c in the axial direction of the guide wheel 5 with a thickness of about 3 μm. ing.
This shot peening layer 6 has a surface roughness of 2.5 μm or less and a surface structure in which minute irregularities are uniformly dispersed. Therefore, lubricating oil is retained in the concave portions of the irregularities. Thus, a fluid film is formed.

Thereby, by controlling the surface roughness optimally, the sliding contact surfaces of the guide wheels 5 and 3 and the cage 4 and the inner ring 1 can be prevented from contacting metal, and wear is increased due to an increase in compressive residual stress due to shot peening. Can be prevented.
Furthermore, since friction on the sliding contact surfaces can be reduced, heat generation can be reduced. In addition, retaining the lubricating oil in the concave portion also has the effect of eliminating oil film breakage at the sliding contact surfaces of the guide wheel 5 and the inner ring 1 and the retainer 4, and the lubrication state is improved over a long period of time. Can be maintained.

Here, as this shot peening process, it is effective to use, for example, a WPC (Wonder Process Craft) process (shot peening process (registered trademark) provided by Fuji Seisakusho and Fuji Machine Sales Co., Ltd.). It is.
For example, a powder having a particle size of 40 to 200 μm and a hardness equal to or higher than the hardness of the guide wheel 5 (for example, the same material as that of the guide wheel 5 or SiO ₂ ) is used as an injection granule. By spraying on the surface of the guide wheel 5 at a speed of 100 m / sec or more for about several seconds to several tens of seconds, the surface of the guide wheel 5 is rapidly and rapidly cooled and rapidly cooled in the temperature range above the A3 transformation point. Processing having the aforementioned heat treatment effect and training effect is performed. As a result, martensite, recrystallization, and refinement of the retained austenite in the metal surface layer are performed, and a dense, high hardness and tough structure can be obtained. In addition, the internal residual compressive stress on the surface can be increased.

Further, a SiO ₂ powder having a hardness of Hv 800 or more and a particle size of _{20 to 200} μm is used as an injection granule, and this is injected onto the surface of the guide wheel 5 at an injection speed of 50 m / sec or more. Is increased to the A3 transformation point or higher, and an oil reservoir composed of innumerable concave portions having a minute cross-sectional arc shape is formed on the surface thereof, whereby wear due to running out of lubricating oil can be prevented.

Further, when a cemented carbide powder such as TiC or TiN is used as the spray powder, the cemented carbide material such as cobalt deposited on the surface is pushed into the interior and refined, and the interior of the surface of the guide wheel 5 is reduced. The residual stress is also increased, the surface is smoothed, and the friction coefficient can be further reduced.
Further, as proposed in Patent Document 8, when such a shot peening process is performed, metal particles constituting the parent phase of the guide wheel 5, molybdenum disulfide (MoS ₂ ), tungsten disulfide ( If an injection granule formed by mixing particles of a solid lubricant such as WS ₂ ), boron nitride (BN), or fluororesin (for example, PTFE) is used, the solid lubricant is dispersed in the shot peening layer 6. Since the coated film is formed, the above effect can be further improved.

In addition, this shot peening process can remove burrs and turning marks in turning and pressing processes, scales and welds in heat treatment processes, etc., and is therefore effective in improving cleanliness.・ Improves contact with inner ring and cage. For this reason, this shot peening process is preferably performed at least on the entire surface of the guide wheel 5.
Therefore, according to the self-aligning roller bearing of this embodiment provided with such a shot peening layer 6, the sliding contact surface 5c is high and the sliding friction coefficient is small. Can reduce sliding friction.

Second Embodiment
Next, in the second embodiment of the self-aligning roller bearing according to the present invention, instead of the shot peening layer 6 as a hardened surface layer 6 formed on both axial end surfaces 5c of the guide wheel 5 shown in FIG. A DLC layer or a ceramic layer is formed by the PVD method.
According to the self-aligning roller bearing of the present embodiment, since the DLC layer or the ceramic layer is formed on the sliding contact surface 5c with the roller 3 in the guide wheel 5, the sliding contact surface 5c has high hardness, and Since the sliding friction coefficient is reduced, the sliding friction associated with the installation of the guide wheel 5 can be reduced. Therefore, according to the self-aligning roller bearing of the present embodiment, even when used under high speed rotation and high load as in the first embodiment, generation of wear, heat generation, abnormal noise, and grease life Can be prevented, so the life can be improved.

Here, the method for forming the DLC layer is not particularly limited, and a conventionally known method using a PVD method or the like can be applied as it is.
As an example, first, the surface of the guide wheel 5 is shot blasted using steel beads having a particle diameter of 20 to 30 μm, the surface roughness Ra is adjusted, and then the surface is degreased. Then, it is installed in a sputtering apparatus, and the surface of the guide wheel 5 is bombarded by sputtering using argon plasma. Then, sputtering is performed on the surface of the guide wheel 5 using tungsten, chromium, or the like as a target to form a metal layer. Next, while continuing sputtering of these two kinds of metals, carbon sputtering using carbon as a target is started. By such sputtering, a composite layer made of metal carbide in which the two kinds of metals and carbon are bonded is formed on the metal layer. Further, while gradually decreasing the sputtering efficiency of the two kinds of metals, the sputtering efficiency of carbon is gradually increased, and when the sputtering of the two kinds of metals is completed, the composite layer is formed only as the sputtering of carbon. A carbon layer is formed on the substrate.

  Thereby, a DLC layer in which the composition of the layer is gradually and gradually changed from the layer composed of two kinds of metals (metal layer) toward the layer composed of carbon (carbon layer) can be formed. it can. The DLC layer having such a structure has a thickness of about 1.0 to 4.0 μm and has excellent adhesion between the layers, and a carbon layer and a base material excellent in lubricity. It has the feature that the adhesiveness with the steel is very excellent.

<Third Embodiment>
Next, as shown in FIG. 2, the third embodiment of the self-aligning roller bearing according to the present invention includes a ring-shaped guide wheel 5, an axial center portion 2 b on the raceway surface 2 a of the outer ring 2, and a cage 4. This is different from the self-aligning roller bearing described in the first and second embodiments in that it is disposed between the outer peripheral surface and the outer peripheral surface.
The guide wheel 5 has an inner peripheral surface (sliding contact surface) 5 a that is in sliding contact with a part of each outer peripheral surface of the two cages 4, and an outer peripheral surface (sliding contact surface) 5 b that is a raceway surface 2 a of the outer ring 2. In FIG. 2, the axially central portion 2b is in sliding contact, and both axial end surfaces (sliding contact surfaces) 5c are in sliding contact with a part of the axial end surface of the roller 3.
The first surface hardening layer 6 is applied to the entire surface of the ring forming the guide wheel 5 (the sliding contact surface 5b with the outer ring 2, the sliding contact surface 5c with the roller 3 and the sliding contact surface 5a with the cage 4). The shot peening layer shown in the form or the DLC layer or ceramic layer formed by the PVD method shown in the second embodiment is formed with a thickness of about 3 μm.

According to the self-aligning roller bearing of this embodiment, since any one of these hardened surface layers 6 is formed on the sliding contact surfaces 5a to 5c of the guide wheel 5 with other rolling parts, the sliding contact surface thereof. Since the hardness of 5a-5c is high and a sliding friction coefficient becomes small, the sliding friction accompanying installation of the guide wheel 5 can be reduced.
Moreover, if it is a shot peening layer, there also exists an effect | action which eliminates the oil film cutting | disconnection on a slidable contact surface, and can maintain those lubrication conditions favorably over a long period of time.
Therefore, according to the self-aligning roller bearing of the present embodiment, even when used under high speed rotation and high load, it is possible to prevent wear, heat generation, abnormal noise generation and grease life reduction, Lifetime can be improved.

It is sectional drawing which shows an example of the self-aligning roller bearing which concerns on this invention. It is sectional drawing which shows the other example of the self-aligning roller bearing which concerns on this invention.

Explanation of symbols

1 inner ring
2 Outer ring
Around 3
4 Cage
5 guide wheels
6 Surface hardened layer (shot peening layer or DLC layer or ceramic layer)

Claims (7)

An inner ring having a double-row raceway surface on the outer peripheral surface, an outer ring having a spherical raceway surface facing the raceway surface on the inner peripheral surface, and a plurality of rolls disposed between the double-row raceway surfaces in a freely rotatable manner. In a guide wheel that is used in a self-aligning roller bearing provided with a roller and is arranged between rows of the rollers to guide the roller,
A guide roller for a self-aligning roller bearing, characterized in that a hardened surface layer that reduces a coefficient of friction is formed on at least a part of a sliding contact surface with another rolling component. In the self-aligning roller bearing guide wheel according to claim 1,
The guide roller for a self-aligning roller bearing, wherein the hardened surface layer is a shot peening layer formed by a shot peening process, and the maximum roughness of the surface of the shot peening layer is 2.5 µm or less. In the self-aligning roller bearing guide wheel according to claim 2,
A guide wheel for a self-aligning roller bearing, wherein the shot peening layer has a surface hardness of Hv 800 or more. In the guide ring for spherical roller bearings according to any one of claims 2 and 3,
A guide wheel for a self-aligning roller bearing, wherein a film in which a solid lubricant is dispersed is formed on the surface of the shot peening layer. In the self-aligning roller bearing guide wheel according to claim 1,
A guide wheel for a self-aligning roller bearing, wherein the surface hardened layer is a diamond-like carbon layer. In the self-aligning roller bearing guide wheel according to claim 1,
A guide wheel for a self-aligning roller bearing, wherein the surface hardened layer is a ceramic layer. An inner ring having a double-row raceway surface on the outer peripheral surface, an outer ring having a spherical raceway surface facing the raceway surface on the inner peripheral surface, and a plurality of rolls disposed between the double-row raceway surfaces in a freely rotatable manner. In a self-aligning roller bearing comprising a roller and a guide wheel that is disposed between rows of the rollers and guides the roller,
The self-aligning roller bearing, wherein the guide wheel is a self-aligning roller bearing guide wheel according to any one of claims 1 to 6.

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