JP2007085384A - Cylindrical roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical roller bearing having a little wear of a flange section in use under a condition where axial load is applied and capable of stably maintaining a function thereof for a long period of time. <P>SOLUTION: In the cylindrical roller bearing including flanges on axial direction both sides of an inner ring 1 and an outer ring 2 made of blister steel, a flange on an axial direction one end side of the inner ring 1 at a position receiving axial load and a flange on an axial direction another end side of the outer ring 2 are composed of separate flange rings 11, 12 made of bearing steel or tool steel. Wear of the flange section in the side receiving axial load is reduced, and a lifetime of the bearing is improved by the structure mentioned above. Also, since the flange rings 11, 12 is easily maintained and replaced, and progress of wear is gentle, sudden bearing trouble is avoided beforehand. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cylindrical roller bearing having flanges at both axial ends of inner and outer rings, and more particularly, suitable for supporting a low-speed rotating shaft to which a radial load and an axial load are applied simultaneously, such as a forming roll of a continuous casting machine. The present invention relates to a cylindrical roller bearing.

  In general, support for rotating shafts, such as support rolls, guide rolls, and pinch rolls that constitute the slab conveyance path of a continuous casting machine, are simultaneously aligned with the radial load received from the slab and the axial load due to the thermal expansion of the roll. Are often used.

  In addition, since the forming roll of this continuous casting machine rotates at a very low speed (5 rpm or less) under an excessive radial load, in a roller bearing device that supports this forming roll, It is known that the separation of the raceway due to rolling fatigue, which is a problem in rolling bearings, does not increase the bearing life, but the “cracking” of the bearing ring due to cracks caused by surface-induced separation due to wear determines the life of the bearing. ing. Therefore, in order to prevent cracking of the bearing ring, the steel material constituting the bearing ring of the roller bearing that rotates at a very low speed under such a high radial load is a surface-hardened steel that has been subjected to carburizing or carbonitriding, that is, carburizing. Steel is used (see, for example, Patent Documents 1 and 2).

  However, as described above, when a self-aligning roller bearing is used as a bearing for supporting a molding roll of a continuous casting machine, uneven wear due to low speed and high load is likely to occur. When used, there is a problem that the load capacity cannot be increased too much.

  Therefore, the present applicants use a “divided roll” that is divided into three or more pieces in the slab width direction (axial direction of the roll) to reduce the thermal expansion amount for each roll and the deflection amount during slab conveyance. By doing so, the structure which supports at least one edge part of each division | segmentation roll with the cylindrical roller bearing which has a ridge | wrist in the axial direction both ends of an inner and outer ring | wheel is proposed (refer patent document 3).

  FIG. 3 is an axial sectional view showing a structure of a conventional cylindrical roller bearing used for supporting a forming roll of a continuous casting machine.

  This figure shows the end of the forming roll (split roll 10) located below the slab conveying path of the continuous casting machine. Each forming roll uses a "split roll" divided in the slab width direction (axial direction: left and right in the figure) in consideration of the high heat applied from the slab and the radial load. These split rolls 10 are supported by a supporting device attached to a segment frame (not shown).

  The support device that supports the split roll 10 includes a full-load cylindrical roller bearing having a high load capacity and a bearing housing H that accommodates the bearing. The cylindrical roller bearing includes an inner ring 1 fitted on an outer peripheral surface 10x of a small-diameter portion 10a formed at the end of the roll, an inner ring side collar 11 disposed adjacent to the inner ring 1, and a bearing housing H. The outer ring 2 is fixed to the outer ring 2, and a plurality of cylindrical rollers 3 arranged on a rolling element raceway formed by the inner ring 1 and the outer ring 2 are mainly used.

  An inner ring collar 1a that protrudes toward the outer diameter side is formed at one axial end portion (the left side in the figure) of the inner ring 1, and the other end portion (the right side in the figure) on the opposite side across the inner ring raceway surface 1x. A separate inner ring side collar 11 is disposed adjacent to the inner ring 1. The inner ring 1 and the inner ring side flange 11 are positioned in the axial direction on the outer circumferential surface 10x of the roll by the retaining ring 4.

  The outer ring 2 is formed with outer ring flanges 2a and 2b projecting toward the inner diameter side at both ends in the axial direction across the outer ring raceway surface 2x, and the inner ring outer ring flanges 1a, 2a, A load in the axial direction (axial direction) due to thermal expansion and contraction of the roll 10 is applied by 2b and the saddle wheel 11.

The members constituting the rolling element raceway (inner ring 1, outer ring 2 and saddle ring 11) are made of carburized steel as in the prior art, and the rolling element (cylindrical roller 3) is made of bearing steel. It is formed using.
JP-A-9-264328 JP 2000-246410 A JP 2004-34087 A

  By the way, in a cylindrical roller bearing with a flange made up of a raceway member using the above-described carburized steel, an axial load is applied due to poor lubrication due to extremely low speed rotation or high speed rotation. ) May cause bearing damage such as galling or wear.

  As shown in FIG. 3, this galling or abrasion is caused by the wrinkles (in this figure, the roller 3 and It is characterized by a tendency to occur on the inner ring flange portion 1a and outer ring flange portion 2b that are in sliding contact with each other (two circles), and is accelerated after the hardened surface layer of the carburized steel used for the race member is worn out. There is a risk of progress.

  In addition, such a sudden trouble of the bearing may cause a large-scale accident. For example, in the continuous casting equipment as described above, a line stop or a segment is caused by a bearing trouble. Large amounts of damage may occur, such as roll changes in (block) units.

  The present invention has been made to cope with the above-described problems, and even when used under a condition where an axial load is applied, the wear of the heel portion is small, and its function can be stably maintained over a long period of time. It aims at providing a cylindrical roller bearing.

  In order to achieve the above object, the invention according to claim 1 is a cylindrical roller bearing having flanges on both axial sides of the raceway surface of the inner and outer rings made of carburized steel, on one end side in the axial direction of the inner ring. The inner ring is integrally formed with the inner ring, and an inner ring side ring made of bearing steel or tool steel is disposed on the other axial end side of the inner ring, and has a diameter with respect to the inner ring flange. An outer ring side saddle made of bearing steel or tool steel is arranged on one axial end side of the outer ring facing the direction, and a flange is formed integrally with the outer ring on the other axial end side of the outer ring. It is characterized by being.

  The present invention provides a cylindrical roller bearing having flanges on both sides in the axial direction of the raceway surface of the inner and outer rings, wherein the flange on the side that mainly receives the axial load is configured as a separate ring from the bearing ring. It is intended to achieve the intended purpose by using a steel material having excellent wear resistance.

  In other words, one side of the inner ring and the other side of the outer ring, which are located on opposite sides of the rolling element raceway, are relatively difficult to receive an axial load. By forming the other side of the inner ring and the other side of the outer ring, which are located opposite to each other, which are susceptible to the axial load, as a separate ring made of bearing steel or tool steel, the axial load The wear of the heel part is reduced even in the use under the condition of receiving. In addition, a ring formed using these steel materials having excellent wear resistance has no risk of accelerated wear after the hardened surface wears down, unlike a conventional carburized steel fence. Is separate and easy to maintain and replace. Therefore, the cylindrical roller bearing of the present invention can improve the life of the entire bearing as compared with the conventional roller bearing.

  Here, if there is a possibility of receiving an axial load in the same way from both sides in the axial direction, the inner ring side saddle wheel and outer ring made of bearing steel or tool steel are placed on both sides in the axial direction of the raceway surface of the inner ring and outer ring made of carburized steel. The side collars may be arranged respectively (claim 2).

  With the above configuration, as in the first aspect of the invention, it is possible to extend the life of all the hooks on both sides in the axial direction of the inner and outer rings. In addition, these saddle wheels are easy to maintain and replace, and when the same shape of the saddle wheels are arranged on both sides (left and right) in the axial direction of the race, It is possible to use both end faces of these miners without waste by exchanging them.

  In addition, the cylindrical roller bearing of the present invention can suitably employ a full-roller type cylindrical roller bearing configuration that does not have a cage.

  In the case of a bearing that supports a low-speed rotating shaft to which a high radial load and a high axial load are applied simultaneously, such as a forming roll of a continuous caster, the number of rollers is increased as a full roller bearing without a cage, and the load capacity in the radial direction is increased. It is desirable to increase. Further, since the contact surface pressure between the roller end face and the flange can be lowered as the number of rollers increases, the load capacity in the axial direction is improved and the wear between them is also reduced.

  In addition, as a representative of “bearing steel” used in the present invention, a steel material obtained by quenching high carbon chromium steel such as SUJ2 can be cited. In addition, as typical steel types of “tool steel” in the present invention, carbon tool steel (SK), alloy tool steel (SKS, etc.), high speed tool steel (SKH), and the like can be given.

  As described above, according to the present invention, there is a long-life cylindrical roller bearing capable of maintaining the function stably over a long period of time with little wear on the heel portion even when used under conditions of receiving an axial load. can do.

  In addition, the cylindrical roller bearing using the collar of the present invention is easy to maintain and replace, and, like a conventional cage made of carburized steel, there is a risk of accelerated wear after the hardened surface layer wears down. Therefore, it is possible to prevent a sudden trouble that causes a great deal of damage.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is an axial sectional view showing the structure of a cylindrical roller bearing in the first embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the structural member which has the same function as a prior art example.

  The bearing in this embodiment is also a cylindrical roller bearing used for supporting the molding roll (10) of the continuous casting machine, as in the conventional example, and includes an inner ring 1 fitted into the outer peripheral surface 10x of the roll, and a bearing housing H. And an outer ring 2 fixed to the inner ring 1 and a plurality of cylindrical rollers 3 arranged on a rolling element raceway formed by the inner ring 1 and the outer ring 2. The inner ring 1 and the outer ring 2 are made of carburized steel.

  A feature of the cylindrical roller bearing in the present embodiment is that a collar on one end side (the left side in the drawing) of the inner ring 1 is formed by an inner ring side collar 11 disposed adjacent to the inner ring 1 and the outer ring 2. The other side in the axial direction (the right side in the drawing) is formed by an outer ring side saddle wheel 12 disposed adjacent to the outer ring 2.

  Moreover, these saddle wheels 11 and 12 are formed using bearing steel, and in this example, are arranged on the side mainly receiving the axial load due to the thermal expansion of the roll 10. Note that the flange portion 1b located on the other axial end side (the right side in the figure) of the inner ring 1 and the flange portion 2a located on the one end side (the left side in the figure) of the inner ring 1 are not integrated with these inner and outer rings. Is formed.

  With the above configuration, this cylindrical roller bearing can reduce wear on the heel portion even when used under the condition of receiving an axial load as in this example. In addition, since each of the saddle wheels 11 and 12 made of bearing steel has a slow progress of wear, it is possible to avoid a sudden bearing trouble that causes a great deal of damage.

  In addition, the cylindrical roller bearing in this embodiment uses a raceway ring (inner ring 1 and outer ring 2) made of carburized steel as a full-roller type high-load capacity bearing, so that it can be rotated at a low speed under a high radial load. Even in use, these raceways are prevented from cracking. Further, in combination with the long life of the aforementioned heel portion, the rotating shaft to which the radial load and the axial load are simultaneously applied can be stably supported over a long period.

  Next, a second embodiment of the present invention will be described. FIG. 2 is an axial sectional view showing a structure of a cylindrical roller bearing in the second embodiment of the present invention.

  The cylindrical roller bearing in this embodiment is different from the cylindrical roller bearing in the first embodiment in that all the collars on both sides in the axial direction of the bearing ring are configured using a collar ring separate from the bearing ring. is there. Accordingly, the inner ring side saddle wheel 11 and the outer ring side saddle wheel 12 made of bearing steel are arranged adjacent to each other on both sides (left and right in the drawing) of the inner ring 1 and the outer ring 2 made of carburized steel.

  With this configuration, the cylindrical roller bearing according to the present embodiment reduces the wear of each flange portion even when an axial load is similarly applied from both sides in the axial direction, and the wear progresses slowly, resulting in great damage. It is possible to prevent sudden troubles that occur.

  In addition, these saddle wheels 11 and 12 are easy to maintain and replace, and depending on the progress of wear, the left and right inner ring side saddle wheels 11 or the outer ring side saddle wheel 12 are exchanged to generate wear. It is also possible to use new end faces that are not.

  The configuration of the cylindrical roller bearing of the present invention is not limited to the configuration in these embodiments. Of course, the present invention can be applied not only to the continuous casting machine roll support device shown in the embodiment but also to other devices having a rotating shaft to which a radial load and an axial load are applied simultaneously.

It is an axial sectional view showing the structure of the cylindrical roller bearing in the first embodiment of the present invention. It is an axial sectional view showing the structure of a cylindrical roller bearing in a second embodiment of the present invention. It is an axial sectional view showing the structure of a conventional cylindrical roller bearing used for supporting a forming roll of a continuous casting machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner ring 1a, 1b Inner ring collar part 1x Inner ring raceway surface 2 Outer ring 2a, 2b Outer ring collar part 2x Outer ring raceway surface 3 Cylindrical roller 4 Retaining ring 10 Roll 10a Small diameter part 10x Outer peripheral surface 11 Inner ring side saddle ring 12 Outer ring side saddle ring H Housing

Claims (3)

A cylindrical roller bearing having flanges on both sides in the axial direction of the raceway surface of the inner and outer rings made of carburized steel,
A collar portion is formed integrally with the inner ring on one end side in the axial direction of the inner ring, and an inner ring side collar made of bearing steel or tool steel is disposed on the other axial end side of the inner ring.
An outer ring side saddle made of bearing steel or tool steel is disposed at one axial end of the outer ring that is radially opposed to the inner ring flange, and the outer ring is disposed on the other axial end of the outer ring. A cylindrical roller bearing characterized in that a flange is integrally formed.   A cylindrical roller bearing characterized in that an inner ring side saddle wheel and an outer ring side saddle ring made of bearing steel or tool steel are respectively arranged on both axial sides of the raceway surfaces of the inner ring and outer ring made of carburized steel. The cylindrical roller bearing according to claim 1, wherein the cylindrical roller bearing is a full roller bearing having no cage.

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