JP2018135895A - Backup roll bearing device and method of application thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a backup roll bearing device capable of performing accurate filling with grease only for a suitable quantity, avoiding an excessive running torque caused by too much grease and suppressing exhaustion of grease for a long time.SOLUTION: A backup roll bearing device 10 comprises multiple radial bearings 14 that are provided between a roll 13 and a shaft 12. A bearing part space 41 and an inter-bearing space 42 are separated by a side plate 17 of which the inner diameter end is in non-contact with an outer diameter surface of the shaft 12. A ratio of grease filling capacity excluding capacity occupied by constituent members 23 and 24 of the radial bearings 14 from the capacity of the bearing part space 41 with respect to total spatial capacity adding the capacity of the bearing part space 41 and the capacity of the inter-bearing space 42 is 25% or 35%. When starting initial operation, the bearing part space 41 is being filled with grease G fully and the inter-bearing space 42 is not being filled with the grease G.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a backup roll bearing device used for a tension leveler and the like in a rolling process of a steel material and a method for using the same.

  A roller leveler or a tension leveler is used as a straightening machine for correcting a shape defect such as waving or warping in a metal plate or metal strip. These levelers repeatedly apply bending and unbending deformation to a leveling material such as a metal plate, and remove uneven distortion due to stress generated in the plate surface by this deformation. In the tension leveler, the strain removal effect is further enhanced by applying tension in the longitudinal direction of the metal plate.

  For example, in a tension leveler, a work roll, an intermediate roll, and a backup roll are provided as one unit, and the unit is disposed so as to sandwich the leveling material from above and below in the traveling direction, and the work roll is directly attached to the leveling material. Contact level to correct the leveling material.

  FIG. 10 is a cross-sectional view of an example of a backup roll bearing device used for the backup roller. The backup roll bearing device 30 includes a plurality of radial bearings (rollers with cages) 34 that receive a radial load, and a thrust bearing (ball bearing) 35 that is disposed on the outer side in the axial direction of the radial bearing 34 and receives the thrust load. A roll 33, which is a rotating cylinder, is rotatably supported with respect to the fixed shaft 32.

  The rotation of the roll 33 in the backup roll bearing device 30 is given by the friction force generated in the roll 33 through the work roll and the intermediate roll that are in contact with the metal plate to be corrected. Therefore, the backup roll bearing device 30 is required to make the torque necessary for starting the rotation from the state where the roll 33 is stopped and the torque during the rotation as small as possible.

  In order to keep the rotational torque small, it is preferable that there is no excess grease around the radial bearing 34. For this reason, in the conventional backup roll bearing device 30, as shown in FIG. 10, the grease G (in both the bearing space 41 around the radial bearing 34 and the inter-bearing space 42 between the adjacent radial bearings 34. It has been generally performed to fill a suitable amount of each (indicated by cross-hatching).

  Further, the space between the bearings is formed in a groove shape recessed to the outer diameter side to increase the volume, and only the space between the bearings with the increased volume is filled with grease, while ensuring the total amount of grease, A backup roll bearing device has been proposed in which excessive grease is not present in the bearing space (Patent Document 1).

JP 2009-297863 A

  Filling the backup roll bearing device 30 with grease is performed before the fixed shaft 32 is assembled in the assembly process. In the case of the backup roll bearing device 30 shown in FIG. 10, for the bearing space 41, the diameter of the roller 34a disposed in the bearing space 41 and the radial depth of the bearing space 41 match. As a guide, grease G can be filled in an appropriate amount.

  However, in the inter-bearing space 42, since there is no roller 34a that serves as a guide, it is difficult to fill the grease G with an appropriate amount. That is, the axial filling range is determined by the side plate 37 that divides the bearing space 41 and the inter-bearing space 42, but it is easy to understand, but the radial filling depth is difficult to understand. For example, as shown in FIG. 11, if an excessive amount of grease G is filled in the inter-bearing space 42, the excess amount of grease G is scraped off by the fixed shaft 32 when the fixed shaft 32 is assembled. There is a possibility that the amount of grease G sealed in the inter-bearing space 42 may differ.

  Even when the grease is filled only in the space between the bearings as in Patent Document 1, it is difficult to fill the space between the bearings with an appropriate amount of grease as described above. Moreover, even if the space between the bearings is formed in a groove shape recessed to the outer diameter side to increase the volume, the ratio of the volume of the space between the bearings to the total space volume obtained by adding the volume of the bearing space and the volume of the space between the bearings Is small, there is a concern that grease will be depleted early.

  An object of the present invention is to provide a backup roll bearing device capable of accurately filling an appropriate amount of grease, avoiding excessive rotational torque due to excessive grease, and suppressing depletion of grease over a long period of time. And how to use it.

The backup roll bearing device of the present invention is a backup roll bearing device having a plurality of radial bearings provided between a roll and a shaft.
A portion where the radial bearing is disposed in a region between the roll and the shaft is referred to as a bearing space, and a portion between adjacent radial bearings in a region between the roll and the shaft is between the bearings. When we call it space,
The bearing portion space and the inter-bearing space are partitioned by a side plate whose inner diameter end is not in contact with the outer diameter surface of the shaft,
The ratio of the grease filling volume obtained by removing the volume occupied by each component of the radial bearing from the volume of the bearing space to the total space volume obtained by adding the volume of the bearing space and the volume of the space between the bearings is 25. % To 35%,
At the start of initial operation, the bearing space is filled with grease without any gap, and the inter-bearing space is not filled with grease.

  According to this configuration, when assembling the backup roll bearing device, only the bearing space is filled with grease, so that the working efficiency is better than when both the bearing space and the space between the bearings are filled with grease. Filling the bearing space with grease is performed when a radial bearing is incorporated in the inner diameter of the roll. Then, after filling the grease, the shaft is assembled. When filling the grease, the filling amount is determined based on the radial bearing. Specifically, the rolling elements of the radial bearing are completely buried in the grease. Thus, by filling the grease with the radial bearing as a reference, the grease can be filled without excess or deficiency.

  When using this backup roll bearing device, the running-in operation is performed from an initial state where the bearing space is filled with grease without any gap and the bearing space is not filled with grease. As the radial bearing rotates, the grease in the bearing space is gradually scraped into the space between the bearings. Then, when the amount of grease in the bearing space becomes an appropriate amount, full-scale operation is started. At this time, since the amount of grease in the bearing space is reduced by the amount scraped into the space between the bearings, excessive rotational torque due to excessive grease is avoided, and a large starting tangential force is obtained.

  The reason why the ratio of the grease filling volume to the total space volume is 25% to 35% is as follows. That is, when it is 25% or less, the amount of grease filled in the bearing space is too small. Further, when grease is scraped from the bearing space into the space between the bearings by running-in, the remaining amount of grease in the bearing space is reduced. For this reason, the residual amount of grease in the bearing space at the start of full-scale operation is small, and the radial bearing may be poorly lubricated. Moreover, when it is 35% or more, the amount of grease filled in the bearing space becomes too large. For this reason, the residual amount of grease in the bearing space at the start of full-scale operation is large, and the stirring resistance of the radial bearing is increased, resulting in an increase in torque. The ratio that can satisfy both prevention of poor lubrication and prevention of torque increase is 25% to 35%.

  When the grease in the bearing space decreases due to long-term use, the grease temporarily held in the space between the bearings is returned to the bearing space. For this reason, grease depletion can be suppressed over a long period of time, and the life of the radial bearing can be extended.

In this invention, the radial bearing is a roller with a cage formed by holding a plurality of rollers with a cage, and the cage has a rolling element guide whose inner and outer diameter portions do not contact the shaft and the roll. It should be a mold.
If the cage is a rolling element guide type, the inner diameter portion of the cage does not contact the shaft, and the outer diameter portion of the cage does not contact the inner diameter surface of the roll. The amount of grease in the bearing space can be properly maintained without being discharged.

The method of using the backup roll bearing device of the present invention is applied to a backup roll bearing device having a plurality of radial bearings provided between the roll and the shaft.
The backup roll bearing device includes:
A portion where the radial bearing is disposed in a region between the roll and the shaft is referred to as a bearing space, and a portion between adjacent radial bearings in a region between the roll and the shaft is between the bearings. When we call it space,
The bearing portion space and the inter-bearing space are partitioned by a side plate whose inner diameter end is not in contact with the outer diameter surface of the shaft,
The ratio of the grease filling volume obtained by removing the volume occupied by each component of the radial bearing from the volume of the bearing space to the total space volume obtained by adding the volume of the bearing space and the volume of the space between the bearings is 25. % To 35%.
At the start of the initial operation of this backup roll bearing device, the bearing space is filled with grease without any gap, and the inter-bearing space is not filled with grease.

  According to the method of using this backup roll bearing device, as described above, by performing the running-in operation from the initial state, the grease in the bearing space is scraped into the space between the bearings, and the amount of grease in the bearing space is reduced. Make an appropriate amount. By starting full-scale operation at this stage, it is possible to avoid excessive rotational torque due to poor lubrication of the radial bearing and excessive grease. Further, when the grease in the bearing space decreases due to long-term use, the grease temporarily held in the space between the bearings is returned to the bearing space. For this reason, grease depletion can be suppressed over a long period of time, and the life of the radial bearing can be extended.

  The backup roll bearing device of the present invention is a backup roll bearing device having a plurality of radial bearings provided between the roll and the shaft, wherein the radial bearing is disposed in a region between the roll and the shaft. When the portion is referred to as a bearing portion space and the portion between the adjacent radial bearings in the region between the roll and the shaft is referred to as an inter-bearing space, the bearing portion space and the inter-bearing space have an inner diameter end. Is divided by a side plate that is not in contact with the outer diameter surface of the shaft, and the total space volume obtained by adding the volume of the bearing space and the volume of the space between the bearings is determined from the volume of the bearing space. The grease filling volume excluding the volume occupied by each component of the radial bearing is 25% to 35%, and there is no gap in the bearing space at the start of initial operation. Since the grease is not filled in the space between the bearings, it is possible to accurately fill the grease with an appropriate amount, to avoid excessive rotational torque due to excessive grease, and for a long period of time. Can be depleted.

  The method of using the backup roll bearing device according to the present invention is applied to a backup roll bearing device having a plurality of radial bearings provided between the roll and the shaft, and the backup roll bearing device includes the roll and the shaft. When a portion where the radial bearing is disposed in a region between them is referred to as a bearing portion space, and a portion between adjacent radial bearings in a region between the roll and the shaft is referred to as an inter-bearing space, the bearing The total space obtained by adding the volume of the bearing portion space and the volume of the inter-bearing space, in which the inner space and the inter-bearing space are partitioned by a side plate whose inner diameter end is not in contact with the outer diameter surface of the shaft. The ratio of the grease filling volume excluding the volume occupied by each component of the radial bearing from the volume of the bearing space to the volume is 25% to 35%, At the start of the initial operation, the bearing space is filled with grease without gaps, and the space between the bearings is not filled with grease, so that excessive rotational torque due to excessive grease can be avoided and for a long time. Grease depletion can be suppressed.

It is the schematic which shows the equipment of the last process of rolling operations, such as a steel plate. It is a side view of a tension leveler unit. It is a front view of a tension leveler unit. It is sectional drawing of the backup roll bearing apparatus concerning one Embodiment of this invention. It is a figure which takes out and shows only the bearing part space and the space between bearings of the backup roll bearing device. (A) is a partial view showing the minimum limit of the inner diameter of the middle brim portion of the backup roll bearing device, (B) is a partial view showing the maximum limit. It is sectional drawing which shows the state in the running-in period of the backup roll bearing apparatus, and has shown only the upper half from the centerline. It is sectional drawing which shows the state at the time of the end of break-in operation of the backup roll bearing apparatus, and has shown only the upper half from the centerline. It is a figure which shows the relationship between the ratio of the volume of the space between bearings with respect to the total space volume in the backup roll bearing apparatus, the grease amount of a bearing part space, and the state of a radial bearing. It is sectional drawing of the conventional backup roll bearing apparatus, and has shown only the upper half from the centerline. It is sectional drawing which shows the state in the middle of the assembly of the backup roll bearing device, and shows only the upper half from the center line.

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view of equipment in the final process of rolling work such as a steel plate. In this step, the stress of the leveling material 2 such as a steel plate transferred between the upper and lower drive rolls 1 is removed by a tension leveler 3 that is a straightening machine. Thereby, the accuracy of the leveling material 2 is ensured. The tension leveler 3 is composed of a plurality of tension leveler units 4 that are arranged above and below the transfer path of the leveling material 2.

  2 and 3 are a side view and a front view of the tension leveler unit 4, respectively. The tension leveler unit 4 includes a work roll 5, an intermediate roll 6, and a backup roll 7. The work roll 5 directly contacts the leveling material 2 to correct the leveling material 2. The work roll 5 is supported by the intermediate roll 6 and the backup roll 7, and finally all loads are supported by the backup roll 7.

  FIG. 4 is a cross-sectional view of a backup roll bearing device according to an embodiment of the present invention. This backup roll bearing device 10 is used as the backup roll 7 (FIGS. 2 and 3). The backup roll bearing device 10 includes a cylindrical roll 13 fitted to the outer periphery of a shaft 12 that is a fixed shaft, two radial bearings 14 for radial load loading, and two thrust bearings 15 for thrust load loading. And is supported so as to be rotatable with respect to the shaft 12. The shaft 12 has an axial dimension longer than that of the roll 13. Here, in the backup roll bearing device 10, the direction extending along the shaft 12 is referred to as “axial direction”, and the direction orthogonal to the shaft 12 is referred to as “radial direction”.

  The two radial bearings 14 are arranged side by side at a certain interval in the axial direction. Specifically, the two radial bearings 14 are provided so as to sandwich an intermediate collar portion 13a described later. Each radial bearing 14 is composed of a needle roller with a cage in which a plurality of rollers 23 are held by a cage 24. The cage 24 is, for example, a rolling element guide type in which an inner diameter portion and an outer diameter portion do not contact the shaft 12 and the roll 13. The two thrust bearings 15 are arranged one by one on the outer side in the axial direction of the installation position of the radial bearing 14. Each thrust bearing 15 consists of a deep groove ball bearing, for example.

  The roll 13 has an intermediate collar portion 13a that protrudes toward the inner diameter side at the central portion in the axial direction of the inner diameter surface. The inner collar portion 13a has the same inner diameter over the entire axial direction. The radial bearing 14 is positioned in the axial direction by a side surface of the middle collar portion 13 a of the roll 13 and a retaining ring 16 provided on the inner diameter surface of the roll 13. Side plates 17 are provided between the middle collar portion 13a and the cage 24, and between the retaining ring 16 and the cage 24, so as to partition a bearing space 41 and an inter-bearing space 42 described later. The side plate 17 is fitted into the inner diameter surface of the roll 13 and has a shape in which the inner diameter end does not contact the outer diameter surface of the shaft 12. The side plate 16 is made of a washer, for example.

  Since the thrust bearing 15 is not subjected to a radial load, its outer ring 15 a is fixed to the inner diameter surface of the roll 13 by an interference fit, and the inner ring 15 b is a clearance fit with respect to the shaft 12. The thrust bearing 15 can support thrust loads in both axial directions, and is fixed to the roll 13 and the shaft 12 in both axial directions. Specifically, the movement of the outer ring 15 a in the axial direction is restricted by the retaining ring 16 disposed on the axial direction inner side of the thrust bearing 15. Further, the inner ring 15b is sandwiched between the step surface 12a of the shaft 12 and the annular end cover 18 fitted to the outer diameter surface of the shaft 12, and the axial movement of the inner ring 15b is restricted.

  The end cover 18 is fixed in one axial direction opposite to the thrust bearing 15 by a retaining ring 19 provided on the outer diameter surface of the shaft 12. A gap between the inner diameter surface of the roll 13 and the outer diameter surface of the end cover 18 is sealed by a seal member 20 fixed to the inner diameter surface of the roll 13. An annular seal member 21 such as an O-ring that seals the gap is interposed between the inner diameter surface of the end cover 18 and the outer diameter surface of the shaft 12.

  The space formed in the region between the roll 13 and the shaft 12 is divided into two bearing space 41 and one bearing space 42 by the four side plates 17. The bearing space 41 is a space in a portion where the radial bearing 14 is disposed in a region between the roll 13 and the shaft 12. The bearing space 41 also includes a region occupied by each component (roller 23 and cage 24) of the radial bearing 14. The inter-bearing space 42 is a space between the two radial bearings 14 in a region between the roll 13 and the shaft 12.

  FIG. 5 shows only the bearing space 41 and the inter-bearing space 42 taken out. The volume of the bearing space 41 is C1, the volume of the inter-bearing space 42 is C2, the grease filling volume which is a volume obtained by removing the volume occupied by each component of the radial bearing 14 from the volume C1 of the bearing space 41 is C3. When the total space volume obtained by adding the volume C1 of the partial space 41 and the volume C2 of the bearing space 42 is C (= 2C1 + C2), the dimensions of the respective parts are set so that the following relationship is established. That is, the ratio of the grease filling volume C3 to the total space volume C is set to 25% to 35%. That is, the relationship of (0.25 × C) <C3 <(0.35 × C) is satisfied. At this time, the dimensions are set in consideration of the radial clearance of the rollers 23 of the radial bearing 14, the roundness of the outer diameter surface of the shaft 12, and the roundness of the inner diameter surface of the roll 13.

  As the dimension setting, for example, a radial dimension between the inner diameter surface of the middle collar portion 13a and the central axis O of the shaft 12 is set. Then, in consideration of the radial clearance of the rollers 23 and the roundness of the shaft 12 and the roll 13, the amount of grease charged in the radial bearing 14 before the running-in operation is determined. When the amount of grease is determined, next, the gap between the inner diameter surface of the middle collar portion 13a and the central axis O of the shaft 12 is set so that the ratio of the grease filling volume C3 to the total space volume C is 25% or more and 35% or less. Set the radial dimension of.

  Since the volume C1 and the grease filling volume C3 of the bearing space 41 are determined by the specifications of the radial bearing 14, they are constant. Therefore, the ratio of the grease filling volume C3 to the total space volume C is appropriately determined by changing the volume C2 of the inter-bearing space 42. Incidentally, the volume C2 of the inter-bearing space 42 is determined by the axial length and the inner diameter of the middle collar portion 13a of the roll 13. The axial length of the middle collar portion 13a is related to the axial length of the roll 13. It is difficult to change because there is. Therefore, the ratio of the grease filling volume C3 to the total space volume C is appropriately determined by changing the inner diameter of the middle collar portion 13a and changing the volume C2 of the inter-bearing space 42.

  For example, as shown in FIG. 6A, when the inner diameter surface of the middle collar portion 13a is brought closer to the shaft 12, that is, the inner diameter of the middle collar portion 13a is made smaller, the volume C2 of the inter-bearing space 42 becomes smaller and the total space volume C The ratio of the grease filling volume C3 with respect to increases. For example, the upper limit is 35%. Conversely, as shown in FIG. 6B, when the inner diameter surface of the middle collar portion 13a is moved away from the shaft 12, that is, the inner diameter of the middle collar portion 13a is increased, the volume C2 of the inter-bearing space 42 is increased, and the ratio is increased. Decrease. For example, the lower limit is 25%. The inner diameter of the middle collar portion 13a is set so that the ratio falls within the range between these upper and lower limits.

  As shown in FIG. 4, the backup roll bearing device 10 does not fill the inter-bearing space 42 with the grease G, and fills the bearing space 41 with the grease G without a gap. Filling the bearing space 41 with the grease G is performed when one thrust bearing 15 and both radial bearings 14 are incorporated in the inner diameter portion of the roll 13. Then, after filling the grease G, the shaft 12 is assembled.

  When filling the grease G, the filling amount is determined based on the radial bearing 14 which is a needle roller with a cage. Specifically, the roller 23 of the radial bearing 14 is completely buried in the grease G. Since the diameter of the roller 23 arranged in the bearing space 41 and the radial depth of the bearing space 41 coincide with each other, the grease G can be filled without excess or deficiency using the roller 23 as a guide. Further, since the grease G is filled only in the bearing space 41, the working efficiency is better than when the grease G is filled in both the bearing space 41 and the inter-bearing space 42.

  When this backup roll bearing device 10 is used as the backup roll 7 (see FIGS. 2 and 3), the bearing space 41 is filled with the grease G without a gap, and the inter-bearing space 42 is filled with the grease G. A break-in operation is performed from the initial state (the state shown in FIG. 4). As the radial bearing 14 rotates, the grease G in the bearing space 41 is gradually scraped into the inter-bearing space 42 through the gap between the shaft 12 and the side plate 17 as shown in FIG. Then, as shown in FIG. 8, full-scale operation is started when the inter-bearing space 42 is filled with the grease G and the amount of grease in the bearing space 41 becomes an appropriate amount. At this time, since the amount of grease G in the bearing space 41 is reduced by the amount scraped into the inter-bearing space 42, an excessive rotational torque due to excessive grease is avoided and a large starting tangential force is obtained.

  The reason why the ratio of the grease filling volume C3 to the total space volume C is 25% to 35% is as follows (see FIG. 9). That is, when it is 25% or less, the amount of grease G filled in the bearing space 41 is too small. Furthermore, when the grease G is scraped from the bearing space 41 to the inter-bearing space 42 by the running-in operation, the residual amount of the grease G in the bearing space 41 is reduced. For this reason, the residual amount of grease G in the bearing space 41 at the start of full-scale operation is small, and the radial bearing 14 may be poorly lubricated. Moreover, when it is 35% or more, the quantity of the grease G with which the bearing part space 41 is filled increases too much. For this reason, the residual amount of grease G in the bearing space 41 at the start of full-scale operation is large, and the stirring resistance of the radial bearing 14 is increased, resulting in an increase in torque. The ratio that can satisfy both prevention of poor lubrication and prevention of torque increase is 25% to 35%.

  For example, when the cage 24 of the radial bearing 14 is a rolling element guide type, the grease G in the bearing space 41 is not scraped more than necessary after the break-in operation, and the amount of grease in the bearing space 41 is set appropriately. Can be held in.

  When the grease G in the bearing space 41 decreases due to long-term use, the grease G temporarily held in the inter-bearing space 42 is returned to the bearing space 41. For this reason, depletion of the grease G can be suppressed for a long time, and the life of the radial bearing 14 can be extended.

  In the above embodiment, a roller with a cage is used as the radial bearing 14, but other rolling bearings such as a rolling bearing having an inner ring and an outer ring may be used. In this case, the grease filling volume C3 is a volume obtained by subtracting the volume occupied by the inner ring, outer ring, rolling element and cage of the radial bearing 14 from the volume of the bearing space 41.

  As mentioned above, although the form for implementing this invention based on the Example was demonstrated, embodiment disclosed here is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 10 ... Backup roll bearing apparatus 12 ... Shaft 13 ... Roll 14 ... Radial bearing 17 ... Side plate 23 ... Roller (component)
24. Retainer (component)
41 ... Bearing space 42 ... Inter-bearing space G ... Grease

Claims (3)

In a backup roll bearing device having a plurality of radial bearings provided between a roll and a shaft,
A portion where the radial bearing is disposed in a region between the roll and the shaft is referred to as a bearing space, and a portion between adjacent radial bearings in a region between the roll and the shaft is between the bearings. When we call it space,
The bearing portion space and the inter-bearing space are partitioned by a side plate whose inner diameter end is not in contact with the outer diameter surface of the shaft,
The ratio of the grease filling volume obtained by removing the volume occupied by each component of the radial bearing from the volume of the bearing space to the total space volume obtained by adding the volume of the bearing space and the volume of the space between the bearings is 25. % To 35%,
A backup roll bearing device, characterized in that, at the start of initial operation, the bearing space is filled with grease without any gap, and the space between the bearings is not filled with grease.   2. The backup roll bearing device according to claim 1, wherein the radial bearing is a roller with a cage formed by holding a plurality of rollers with a cage, and the cage has an inner diameter portion and an outer diameter portion of the shaft and A backup roll bearing device of a rolling element guide type that does not contact the roll. A method of using a backup roll bearing device having a plurality of radial bearings provided between a roll and a shaft,
The backup roll bearing device includes:
A portion where the radial bearing is disposed in a region between the roll and the shaft is referred to as a bearing space, and a portion between adjacent radial bearings in a region between the roll and the shaft is between the bearings. When we call it space,
The bearing portion space and the inter-bearing space are partitioned by a side plate whose inner diameter end is not in contact with the outer diameter surface of the shaft,
The ratio of the grease filling volume obtained by removing the volume occupied by each component of the radial bearing from the volume of the bearing space to the total space volume obtained by adding the volume of the bearing space and the volume of the space between the bearings is 25. % To 35%,
A method of using a backup roll bearing device, characterized in that, at the start of initial operation, the bearing space is filled with grease without any gap, and the space between the bearings is not filled with grease.

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