JP2008069823A - Self-alignment roller bearing and roller support structure for continuous casting facilities - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a self-alignment roller bearing dispersing non-slip lines of spherical rollers and simplifying a manufacturing process and an assembly process. <P>SOLUTION: The self-alignment roller bearing 11 is provided with an inner ring having right and left double row inner ring raceway surfaces on an outer diameter surface, an outer ring having a spherical outer ring raceway surface facing the right and left double row inner ring raceway surfaces on an inner diameter surfaces, and a plurality of spherical rollers 14 having spherical rolling surface meeting the inner ring raceway surface and the outer ring raceway surface. The plurality of spherical rollers 14 includes a plurality of kinds of spherical rollers 14a, 14b having different radii of curvature of the rolling surface 17. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a self-aligning roller bearing, and more particularly to a self-aligning roller bearing that supports a rotating member that is loaded with a large load such as a roller of a continuous casting facility and rotates at a relatively low speed.

  A conventional self-aligning roller bearing is described in, for example, Japanese Patent Application Laid-Open No. 2002-147449 (Patent Document 1). The self-aligning roller bearing 101 described in the publication will be described with reference to FIGS. 5 is a view showing the distribution of differential slip of the spherical roller 104 in the self-aligning roller bearing 101, and FIG. 6 is a view showing the wear state of the contact surface between the spherical roller 104 and the inner ring 102 and the outer ring 103.

  First, referring to FIG. 5, the self-aligning roller bearing 101 includes an inner ring 102 having a double row raceway, an outer ring 103 having a double row integral spherical raceway, and a plurality of inner rollers 102 incorporated between the inner ring 102 and the outer ring 103. This is a double row spherical roller bearing provided with the spherical roller 104 and a cage (not shown) that holds the plurality of spherical rollers 104 in a rollable manner.

  Since the spherical roller 104 employed in the self-aligning roller bearing 101 has a curved surface in which the rolling surface 104a forms a part of the spherical surface, the peripheral speed at the time of rolling differs in the axial direction. As a result, only non-slip lines 104b and 104c appearing at two locations in the axial direction of the spherical roller 104 result in pure rolling without slipping, and in other portions, differential between the raceway surfaces 102a and 103a of the inner ring 102 and the outer ring 103. Causes slipping. Further, the differential slip becomes larger as the distance from the non-slip lines 104b and 104c increases.

  Next, referring to FIG. 6, when differential slip occurs between the rolling surface 104 a of the spherical roller 104 and the raceway surfaces 102 a and 103 a of the inner ring 102 and the outer ring 103, wear occurs on the contact surfaces of both. The amount of wear increases as the amount of slip increases, so it is relatively small in the vicinity of the non-slip lines 104b and 104c and increases as the distance from the non-slip lines 104b and 104c increases.

  As the wear progresses, the contact load concentrates at the positions of the non-slip lines 104b and 104c where wear due to differential slip does not occur. As a result, there is a problem that fatigue peeling due to a large contact surface pressure is likely to occur at an early stage, and the maintenance cycle of the bearing is shortened. In particular, in the non-rotating side raceway ring (in many cases, the outer race) fixed to the housing, the load concentrates at a predetermined position on the circumference, and thus problems such as cracks on the raceway surface are likely to occur. . Moreover, this problem is remarkable in the self-aligning roller bearing in which the lubricating oil is difficult to be supplied to the entire bearing by rotating at a low speed.

Therefore, in the self-aligning roller bearing 101 described in the above publication, the spherical roller 104 is an asymmetric roller having left and right end surfaces configured by curved surfaces having different curvatures. The inner ring 102 and the outer ring 103 are alternately arranged with spherical rollers 104 in opposite directions. Thus, it is described that the non-slip lines 104b and 104c of the spherical rollers 104 arranged in the circumferential direction can be dispersed and the progress of wear can be delayed.
JP 2002-147449 A

  Conventionally, the rolling surface 104a of the spherical roller 104 employed in the self-aligning roller bearing 101 is ground to reduce the frictional resistance between the inner ring 102 and the raceway surfaces 102a and 103a of the outer ring 103. The This grinding process is performed by sandwiching both end faces of the spherical roller 104. However, in the spherical roller 104 having both curved end faces, special processes such as forming a dullness are required. As a result, there is a problem that the manufacturing process becomes complicated. Further, when assembling the self-aligning roller bearing 101, it is necessary to be aware of the lateral direction of the spherical roller 104, and the assembly process is complicated.

  Accordingly, an object of the present invention is to provide a self-aligning roller bearing in which non-slip lines of spherical rollers are dispersed and the manufacturing process and the assembling process are simplified. It is another object of the present invention to provide a roller support structure for a continuous casting facility with an extended maintenance cycle by employing such a self-aligning roller bearing.

  A self-aligning roller bearing according to the present invention includes an inner ring having left and right double-row inner ring raceway surfaces on an outer diameter surface, and an outer ring having a spherical outer ring raceway surface facing the left and right double-row inner ring raceway surfaces on an inner diameter surface. And a plurality of spherical rollers having curved rolling surfaces along the inner ring raceway surface and the outer ring raceway surface. The plurality of spherical rollers include a plurality of types of spherical rollers in which the rolling surfaces have different curvatures.

  By making the curvature of the rolling surface of the spherical roller different as in the above configuration, the non-slip line of each spherical roller can be arranged at a different position. As a result, local wear at the contact portion between the spherical roller and the inner and outer rings can be suppressed, and the contact surface pressure portion can be dispersed.

  Further, the end surface of the spherical roller can be a flat surface, and it is not necessary to be aware of the left and right sides of the spherical roller during assembly. As a result, a self-aligning roller bearing in which the manufacturing process and the assembly process are simplified can be obtained.

  A roller support structure for a continuous casting facility according to the present invention includes a mold, a roller for discharging and conveying a slab from the mold, and a self-aligning roller bearing that rotatably supports the roller. When paying attention to the self-aligning roller bearing, an inner ring having left and right double-row inner ring raceway surfaces on the outer diameter surface, an outer ring having a spherical outer ring raceway surface facing the left double row inner ring raceway surface on the inner diameter surface, and the inner ring And a plurality of spherical rollers having curved rolling surfaces along the raceway surface and the outer ring raceway surface. The plurality of spherical rollers include a plurality of types of spherical rollers in which the rolling surfaces have different curvatures.

  By adopting the self-aligning roller bearing having the above configuration as a bearing for supporting a roller, a roller support structure for a continuous casting facility having an extended maintenance cycle can be obtained.

  According to the present invention, it is possible to obtain a self-aligning roller bearing in which non-slip lines of spherical rollers are dispersed and the manufacturing process and the assembling process are simplified. In addition, by adopting such a self-aligning roller bearing, it is possible to obtain a roller support structure for a continuous casting facility with an extended maintenance cycle.

  A self-aligning roller bearing 11 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a view showing a plurality of spherical rollers 14 disposed on the inner ring raceway surface 12a of the inner ring 12, and FIG. 2 is a view showing a self-aligning roller bearing 11 according to an embodiment of the present invention.

  First, referring to FIG. 2, a self-aligning roller bearing 11 according to an embodiment of the present invention maintains an interval between an inner ring 12, an outer ring 13, a plurality of spherical rollers 14, and adjacent spherical rollers 14. A cage 15 and a guide wheel 16 are provided.

  The inner ring 12 has two rows of inner ring raceway surfaces 12a and 12b on the outer diameter surface thereof. A guide wheel 16 for guiding the end face 18 of the spherical roller 14 is disposed between the left and right inner ring raceway surfaces 12a and 12b. The outer ring 13 has a spherical outer ring raceway surface 13a facing the inner ring raceway surfaces 12a and 12b on the inner diameter surface thereof.

  Arbitrary structure can be employ | adopted for the holder | retainer 15. FIG. For example, any of a punching cage formed by cutting a metal, a press cage formed by pressing an iron plate, and a resin cage formed by injection molding of a resin material may be used.

  The spherical roller 14 is a rolling element of a barrel shape as a whole having a curved rolling surface 17 constituting a part of a sphere and both planar end surfaces 18. The spherical roller 14 is a symmetric roller in which the maximum diameter position is located at the center of the roller length. A plurality of the spherical rollers 14 are arranged on each of the left and right inner ring raceway surfaces 12a and 12b, and roll between the inner ring raceway surfaces 12a and 12b and the outer ring raceway surface 13a.

Further, referring to FIG. 1, first and second spherical rollers 14a and 14b having different curvatures of the rolling surfaces 17a and 17b are alternately arranged on the inner ring raceway surface 12a. Specifically, the first spherical roller 14a is, the radius of curvature of the rolling contact surface 17a is relatively small _{R 1.} On the other hand, the second spherical roller 14b is R ₂ (R ₁ <R ₂ ) where the radius of curvature of the rolling surface 17b is relatively large. Since the spherical rollers 14 arranged on the inner ring raceway surface 12b are the same, the description thereof is omitted.

  In the self-aligning roller bearing 11 configured as described above, the position of the non-slip line 19 depends on the curvature of the rolling surface 17 of the spherical roller 14. That is, in the spherical roller 14a having a small curvature radius, the two non-slip lines 19a are formed from the center, and the distance between them is small. On the other hand, in the spherical roller 14b having a large curvature radius, two non-slip lines 19b are formed at both ends, and the distance between them is large.

  Thus, the non-slip lines 19a and 19b can be dispersed by alternately arranging the two types of spherical rollers 14a and 14b having different curvatures of the rolling surfaces 17a and 17b. Thereby, local abrasion of the raceway surfaces 12a, 12b, 13a of the inner ring 12 and the outer ring 13 can be suppressed, and the contact surface pressure portion can be dispersed. Further, since it is not necessary to be aware of the left and right of the spherical roller 14 when the self-aligning roller bearing 11 is assembled, the assembly process can be simplified.

Here, if the curvature radii of the rolling surfaces 17a and 17b are significantly changed, the rolling surfaces 17a and 17b and the raceway surfaces 12a, 12b, and 13a are brought into point contact, and an increase in contact surface pressure becomes a problem. However, if the difference between R ₁ and R ₂ is small, the rolling surfaces 17a and 17b and the raceway surfaces 12a, 12b, and 13a are elastically deformed and both come into surface contact, so that such a problem does not occur.

  In the above embodiment, an example in which two types of spherical rollers 14a and 14b having different rolling surface curvatures are alternately arranged has been shown. However, the present invention is not limited to this, and any configuration may be adopted. it can.

  For example, you may arrange | position three or more types of spherical rollers from which the curvature of a rolling surface differs mutually. Thereby, the non-slip line 19 can be further dispersed. A plurality of types of spherical rollers may be arranged at random. This eliminates the need to be aware of the type of the spherical roller 14 when assembling the self-aligning roller bearing 11, thereby further simplifying the assembly process.

  In the self-aligning roller bearing 11 in the above embodiment, the guide wheel 16 is disposed between the left and right inner ring raceway surfaces 12a and 12b. However, the present invention is not limited to this, and the present invention has all configurations. It can be used for self-aligning roller bearings.

  For example, a self-aligning roller bearing 21 according to another embodiment of the present invention will be described with reference to FIG. Since the basic configuration of the self-aligning roller bearing 21 is the same as that of the self-aligning roller bearing 11, the description of the common points will be omitted and the differences will be mainly described.

  A self-aligning roller bearing 21 according to another embodiment of the present invention is a double-row self-aligning roller bearing including an inner ring 22, an outer ring 23, a plurality of spherical rollers 24, and a cage 25. Further, an intermediate collar 22c is provided between the left and right inner ring raceway surfaces 22a and 22b of the inner ring 22, and an outer collar 22d is provided at both axial ends. The flange portion 22 c has a function of guiding the end surface of the spherical roller 24.

  In the self-aligning roller bearing 21 having the above-described configuration, the effect of the present invention can also be obtained by alternately arranging the spherical rollers 24 having the rolling surfaces 27 having different curvatures on the left and right inner ring raceway surfaces 22a and 22b. Can do.

  Furthermore, in each of the above-described embodiments, an example is shown in which a symmetric roller is used in which the maximum diameter position is located at the center of the roller length. However, the present invention is not limited to this, and the present invention is not limited to this. The present invention can also be applied to a self-aligning roller bearing having an asymmetric roller that does not exist in the center in the length direction.

  Next, with reference to FIG. 4, the continuous casting equipment 31 which employ | adopted the roller support structure which concerns on one Embodiment of this invention is demonstrated. FIG. 4 is an illustrative view of the continuous casting equipment 31.

  The continuous casting equipment 31 includes a ladle 32 and a tundish 33 for receiving molten steel and removing inclusions in the molten steel, a mold 34 for casting the molten steel into a predetermined shape, and a pinch roll 36 for extracting a slab 35 from the mold 34. A guide roll 37 for conveying the slab 35 and a torch 38 for cutting the slab 35 into a predetermined size.

  The molten steel after the refining is first poured into the ladle 32 and reaches the mold 34 through the tundish 33. In addition, in the ladle 32 and the tundish 33, inclusions floating on the surface of the molten steel are removed. The mold 34 is made of, for example, copper and is always water-cooled. As a result, the molten steel in contact with the mold 34 is molded into a predetermined shape and rapidly cooled to solidify the surface.

  Next, the pinch roll 36 transfers the slab 35 extracted from the mold 34 to the guide roll 37. The plurality of guide rolls 37 guide to the torch 38 with the slab 35 sandwiched therebetween. At that time, the slab 35 is spray-cooled and solidified as a whole. Finally, the slab 35 is cut into a predetermined size by a torch 38 as a cutting machine.

  The continuous casting equipment 31 removes inclusions such as oxides that lower mechanical properties such as strength, workability, and fatigue resistance of steel from the molten steel, and facilitates processing in the rolling process. Manufactures semi-finished products called slabs.

  In the continuous casting equipment 31 configured as described above, the pinch roll 36 and the guide roll 37 are greatly bent when the slab 35 is sandwiched. Moreover, the rotational speed of the pinch roll 36 and the guide roll 37 is relatively low. Therefore, as the bearings (not shown) for supporting the rolls 36 and 37, the self-aligning roller bearings 11 and 21 having alignment with respect to bending are suitable.

  In addition, the self-aligning roller bearings 11 and 21 according to the embodiment of the present invention have a long life by disposing the non-slip lines 19 and 29 in a distributed manner. As a result, the maintenance cycle of the continuous casting equipment 31 can be extended.

  In addition, the self-aligning roller bearings 11 and 21 according to each embodiment described above can be used not only for the continuous casting equipment 31 but also for any application. In particular, it has an advantageous effect when used in a high load environment such as construction machines, general industrial machines, wind power generators and the like.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The present invention is advantageously used for a self-aligning roller bearing.

It is a figure which shows the spherical roller arrange | positioned at the inner ring raceway surface of the self-aligning roller bearing shown in FIG. It is a figure which shows the self-aligning roller bearing which concerns on one Embodiment of this invention. It is a figure which shows the self-aligning roller bearing which concerns on other embodiment of this invention. It is a figure which shows the continuous casting installation which concerns on one Embodiment of this invention. It is a figure which shows distribution of the differential slide in the conventional self-aligning roller bearing. It is a figure which shows the wear condition in the conventional self-aligning roller bearing.

Explanation of symbols

  11, 21, 101 Spherical roller bearing, 12, 22, 102 Inner ring, 12a, 12b, 22a, 22b, 102a Inner ring raceway surface, 13, 23, 103, Outer ring, 13a, 23a103a Outer ring raceway surface, 14, 14a, 14b, 24, 104 Spherical roller, 15, 25 Cage, 16 Guide wheel, 17, 17a, 17b, 27, 104a Rolling surface, 18, 18a, 18b, 28 End surface, 19, 19a, 19b, 104b, 104c Non-slip Line, 22c Medium length, 22d Outer length, 31 Continuous casting equipment, 32 Ladle, 33 Tundish, 34 Mold, 35 Slab, 36 Pinch roll, 37 Guide roll, 38 Torch.

Claims (2)

An inner ring having left and right double-row inner ring raceway surfaces on the outer diameter surface;
An outer ring having a spherical outer ring raceway surface facing the inner ring raceway surface of the left and right double rows on the inner diameter surface;
A plurality of spherical rollers having a curved rolling surface along the inner ring raceway surface and the outer ring raceway surface;
The plurality of spherical rollers are self-aligning roller bearings including a plurality of types of spherical rollers in which the rolling surfaces have different curvatures. A mold,
A roller for discharging and conveying the slab from the mold;
A self-aligning roller bearing that rotatably supports the roller,
The self-aligning roller bearing includes an inner ring having right and left double-row inner ring raceway surfaces on an outer diameter surface, an outer ring having a spherical outer ring raceway surface facing the left and right double row inner ring raceway surfaces on an inner diameter surface, and A plurality of spherical rollers having a curved rolling surface along the inner ring raceway surface and the outer ring raceway surface, and the plurality of spherical rollers have a plurality of types of spherical rollers having different curvatures of the rolling surfaces. Including a roller support structure for continuous casting equipment.

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