JP2012172724A - Outer ring rotation-type rolling bearing, and rolling mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outer ring rotation-type rolling bearing of which seal members fixed to an inner ring are configured removably, capable of fixing the seal member surely without being affected by vibration etc., and capable of inhibiting damage even when a shock is applied to the inner ring side during transportation or the like, and to provide a rolling mill using the same.SOLUTION: In the outer ring rotation-type rolling bearing 10, an annular member 25, fixed to the axial outer end parts of shoulder parts 12c of inner ring member 12 and extended outside in the radial direction from the outer circumferential surfaces of the shoulder parts 12c, and C-type retaining rings 24, mounted removably on the shoulder parts 12c inside in the axial direction from the annular member 25 and capable of sandwiching and fixing a first seal member 21 in cooperation with the annular member 25, are provided on the shoulder parts 12c. An annular protrusion 25c is formed on the inner circumferential surface of the annular member 25, while annular grooves 12e, which are engaged with the annular protrusion 25c, are formed on the outer circumferential surfaces of the axial outer ends of the shoulder parts 12c.

Description

  The present invention relates to an outer ring rotating type rolling bearing in which an outer ring rotates and an inner ring does not rotate with a shaft, and a rolling mill, and more particularly, to a backing roll of a multi-stage rolling mill which is a rolling facility for manufacturing steel materials. The present invention relates to an outer ring rotary rolling bearing and a rolling mill used.

  For example, a rolling mill for producing a plate made of a steel material has a work roll that is rolled by pressing and holding the steel material during rolling, and a plate material having a uniform thickness is obtained by preventing the work roll from being bent in the axial direction. A multi-stage rolling mill is often used that includes one or a plurality of intermediate rolls that support the outer peripheral surface of the roll in a rollable manner and a backing roll that supports the intermediate rolls on the outside thereof to prevent the work roll from bending.

  The Sendima rolling mill mainly rolls steel materials such as electromagnetic steel plates and stainless steel plates that are hard and difficult to stretch. Therefore, excessive roll force is applied to the work roll to be rolled, and multiple roll rolls are supported to support the excessive roll force applied to the work roll. Requires a backing roll.

  Since the outer peripheral surface of the outer ring of the bearing constituting the backing roll is periodically reground, the bearing is removed from the rolling mill. When the bearing is removed from the rolling mill, the bearing is also disassembled and cleaned.

  The outer ring rotary rolling bearing is provided with a sealing device to prevent foreign matter from entering from the outside. As a sealing device, a shield plate is press-fitted on the outer peripheral surface of the inner ring, a V-shaped seal is fitted on the inner peripheral surface of the rotating outer ring and fixed with a retaining ring, and the V-shaped seal and the shield plate are slid. Thus, rolling oil and foreign matter from the outside of the bearing are prevented from entering (see Patent Document 1).

  In the outer ring rotary rolling bearing described in Patent Document 2, one seal member is fixed to the inner peripheral surface of the outer ring by a retaining ring, and the other seal member is press-fitted and fixed to the outer peripheral surface of the inner ring. The seal member is provided with a seal lip, and an elastic member is provided on the outer diameter portion of the other seal member to suppress damage to the other seal member when the inner ring is disassembled during regrind.

Japanese Patent Laying-Open No. 2005-140147 (FIG. 2) JP 2009-63098 A

  By the way, in the outer ring rolling bearings described in Patent Documents 1 and 2, since the shield plate and the seal member are installed on the outer peripheral surface of the inner ring by press-fitting, it is difficult to remove the shield plate and the seal member. It was necessary to perform cleaning with the shield plate and the seal member installed.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is a configuration in which the seal member fixed to the inner ring is detachable and securely fixes the seal member without being affected by vibration or the like. It is another object of the present invention to provide an outer ring rotary rolling bearing and a rolling mill that can suppress damage even when an impact is applied to the inner ring side during conveyance.

In order to achieve the above-described object, the present invention is achieved by the following configurations.
(1) an inner ring having an inner ring raceway surface on the outer peripheral surface;
An outer ring having an outer ring raceway surface on the inner circumferential surface;
A plurality of rolling elements arranged so as to be freely rollable between the outer ring raceway surface and the inner ring raceway surface;
A first seal member attached to the inner ring, and a second seal member attached to the outer ring, wherein the elastic seal member provided on one of the first and second seal members includes the first and second seal members. A sealing device in sliding contact with the other of the second sealing members;
An outer ring rotation type rolling bearing used in outer ring rotation,
On the shoulder of the inner ring,
An annular member that is press-fitted and fixed to the outer peripheral surface of the axially outer end of the shoulder, and extends radially outward from the outer peripheral surface of the shoulder;
A seal member fixing member that is detachably attached to the shoulder portion on the inner side in the axial direction than the annular member, and capable of clamping and fixing the first seal member in cooperation with the annular member;
Is provided,
An annular convex portion is formed on the inner peripheral surface of the annular member, and an annular groove portion that engages with the annular convex portion is formed on the outer peripheral surface of the axially outer end portion of the shoulder portion. An outer ring rotation type rolling bearing.
(2) The outer ring rotary rolling bearing according to (1), wherein the annular member is made of a material having a hardness lower than that of the inner ring.
(3) The outer peripheral surface of the shoulder portion to which the annular member is press-fitted and fixed is formed to have a smaller diameter than the outer peripheral surface of the shoulder portion to which the seal member fixing member is attached.
The annular member has a cylindrical part to which the first seal member is fitted, and a flange part that extends axially outside the cylindrical part and radially outward from the cylindrical part,
The sealing member fixing member is attached to a mounting annular groove formed by a stepped portion formed on the shoulder portion and an axially inner end surface of the cylindrical portion (1) or (2) ) Rotating outer ring rolling bearing.
(4) The inner ring includes a pair of inner ring members that can be divided in the axial direction,
The first seal member is detached from the inner ring member by removing the seal member fixing member from the inner ring member after separating the inner ring member from the rolling bearing (1) to (1). (3) The outer ring rotation type rolling bearing according to any one of (3).
(5) A rolling mill comprising a backing roll having the outer ring rotary rolling bearing according to any one of (1) to (4).

According to the outer ring rotary rolling bearing of the present invention, the shoulder portion of the inner ring is press-fitted and fixed to the outer peripheral surface of the outer end portion in the axial direction of the shoulder portion, and extends outward in the radial direction from the outer peripheral surface of the shoulder portion. An annular member, and a seal member fixing member that is detachably attached to the shoulder at an inner side in the axial direction than the annular member, and that can be fixed by sandwiching the first seal member in cooperation with the annular member are provided. It is done. Accordingly, the first seal member can be easily removed from the inner ring by removing the seal member fixing member, and the first seal member can be easily fixed by attaching the seal member fixing member. be able to. In addition, since the annular member positioned at the outer end in the axial direction of the shoulder portion of the inner ring is configured separately from the inner ring in order to sandwich the first seal member, an impact is applied to the annular member during transportation or the like. Even in this case, damage can be suppressed. Further, an annular convex portion is formed on the inner peripheral surface of the annular member, and an annular groove portion that engages with the annular convex portion is formed on the outer peripheral surface of the axially outer end portion of the shoulder portion. Therefore, it is possible to prevent the annular member from moving due to vibration or the like, and it is possible to securely fix the seal member regardless of the influence of vibration or the like.
In addition, since the annular member is made of a material having a lower hardness than the inner ring, damage can be more reliably suppressed even when an impact is applied to the annular member during conveyance or the like.

  Furthermore, according to the rolling mill provided with the backing roll having the outer ring rotating type rolling bearing, it is possible to easily disassemble and clean the bearing from which the seal device is removed when the outer peripheral surface of the outer ring is regrinded.

1 is a perspective view of a multi-stage rolling mill to which an outer ring rotary rolling bearing of the present invention is applied. It is sectional drawing which shows the backing roll of a rolling mill. (A) is sectional drawing of the outer ring | wheel rotation type rolling bearing of this invention, (b) is a principal part enlarged view which shows the sealing device of (a). (A) is a side view of a C-shaped retaining ring for fixing the first seal member of the present invention, (b) is a view of the end of (a) as viewed from the direction of arrow IV, (c ) Is a perspective view of the IV ′ portion. (A) is a side view of a C-shaped retaining ring for fixing the second seal member of the present invention, (b) is a view of the end of (a) seen from the direction of arrow V, (c ) Is a perspective view of a V ′ portion. (A)-(c) is a figure which shows the process of disassembling the outer ring | wheel rotation type rolling bearing of this invention. It is a perspective view which shows the state which removes a C-shaped retaining ring using a tool from an inner ring. It is a perspective view which shows the state which removes a C-shaped retaining ring using a tool from an outer ring. It is sectional drawing of the outer ring | wheel rotation type rolling bearing which concerns on the modification of 1st Embodiment.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the outer ring rotary rolling bearing of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a perspective view of a multi-stage rolling mill to which an outer ring rotary rolling bearing of the present invention is applied, and FIG. 2 is a cross-sectional view showing a backing roll of the rolling mill.

  The multi-stage rolling mill is provided with a plurality of types of rolling roll groups in the housing 1 and rolls the steel material P being conveyed to a uniform thickness by the rolling roll group. The rolling roll group includes a pair of work rolls 2 for rolling the steel material P, a plurality of first intermediate rolls 3 that rotatably support the pair of work rolls 2, and supports the first intermediate rolls 3 rotatably. A plurality of second intermediate rolls 4 are provided, and each second intermediate roll 4 is rotated by a plurality of rolling bearings 10 constituting a backing roll assembled to a plurality of backing roll shafts 5 (see FIG. 2). It is supported freely. Each backing roll shaft 5 is always kept stationary (non-rotating state).

  As shown in FIGS. 2 and 3, the rolling bearing 10 is fitted and fixed to the backing roll shaft 5 and has an inner ring (stationary ring) composed of a pair of inner ring members 12 and 12 each having inner ring raceway surfaces 12 a and 12 a on the outer circumferential surface. ) 11, a single outer ring (rotating ring) 14 that is rotatably disposed opposite the inner ring 11 and has a pair of outer ring raceway surfaces 14 a and 14 a on the inner circumferential surface, and the outer ring raceway surfaces 14 a and 14 a and the inner ring raceway. A plurality of cylindrical rollers (rolling elements) 16 that are arranged in a double row so as to be able to roll between the surfaces 12a and 12a, cages 18 and 18 that hold each cylindrical roller 16 at equal intervals, and an external In order to prevent foreign matter from entering, a pair of seal devices 20 and 20 provided on both sides in the axial direction are used, and are double-row cylindrical roller bearings used for outer ring rotation. In the present embodiment, the cages 18 and 18 divided into two at the central portion in the axial direction are used. However, the integrated holdings in which the column portions protrude from both end surfaces in the axial direction of the annular portion. It may be a vessel.

  In such a multi-stage rolling mill, the outer ring 14 of the rolling bearing 10 is in pressure contact with the plurality of second intermediate rolls 4 and is positioned so as to be rotatable together with the second intermediate rolls 4. In this case, the pressure of each outer ring 14 acts on the pair of work rolls 2 from the second intermediate roll 4 through the first intermediate roll 3, thereby preventing the work roll 2 from being bent. Thereby, the steel material P to be conveyed is rolled to a uniform thickness by the pair of work rolls 2.

  Also, the bearing lubrication mechanism is a multi-stage rolling mill in which a plurality of rolling bearings 10 are assembled to the backing roll shaft 5 at a predetermined interval in the axial direction. Lubricating. At this time, as a lubrication method, lubricating oil is used as a lubricant, and the lubricating oil is made mist using a pressure difference (differential pressure) of air, mixed with compressed air and conveyed by the compressed air. Therefore, an oil mist system is employed in which the misted lubricating oil (oil mist) is supplied to the rolling bearing 10. Note that the number of the rolling bearings 10 assembled to the backing roll shaft 5 may be arbitrarily set according to the size of the multi-stage rolling mill and is not particularly limited here.

  In this case, the lubricant (lubricating oil) is sent together with compressed air from a lubricant supply source (lubricating oil supply source) (not shown), and is conveyed by the compressed air through a lubricating oil supply path communicating from the lubricating oil supply source to the inside of the bearing. As a result, the rolling bearing 10 is supplied.

  The lubricating oil supply path is provided in the backing roll shaft 5 and is provided in shaft paths 5a and 5b communicating with a lubricating oil supply source (not shown), and in the inner ring member 12 of the rolling bearing 10, and in the bearing and the shaft path 5a. , 5b are connected to each other through bearing paths 12b, 12b.

  Specifically, as shown in FIG. 2, the backing roll shaft 5 is formed with a main hole 5 a as an axial path penetrating the inside along the axis, and from the main hole 5 a in the radial direction. A branch hole 5 b is formed as an axial path that passes radially through the backing roll shaft 5 and branches toward the rolling bearing 10. Further, as shown in FIG. 3, the rolling bearing 10 radiates between the two inner ring members 12, 12 radially from the inner diameter side to the outer diameter side, communicates with the branch hole 5 b, Bearing grooves 12b and 12b are formed as bearing paths that open inside the bearing.

  As a result, a lubricating oil supply path is formed which starts from the lubricating oil supply source, passes through the main hole 5a, branches from the main hole 5a to the branch hole 5b, and reaches the bearing inside via the bearing grooves 12b and 12b. . Note that the air pressure required to scatter the lubricating oil by the oil mist method is about 5 kPa.

  Each of the sealing devices 20 of the rolling bearing 10 includes a first seal member 21 that is attached and fixed to the shoulder portion 12c of the inner ring member 12 by a C-shaped retaining ring (a sealing member fixing member) 24, and an outer ring by a C-shaped retaining ring 33. A second seal member 30 attached to the outer ring 14 on the outer side in the axial direction of the raceway surface 14a.

  The first seal member 21 is a V-shaped seal member configured by covering an annular cored bar 22 with an elastic seal member (elastic member) 23 made of an elastic material such as rubber. The cored bar 22 includes an annular disk portion 22a and a positioning end portion 22b that is bent inward in the axial direction from the radially inner end portion of the disk portion 22a and further extends radially inward. The elastic seal member 23 is formed so as to cover the inner surface in the axial direction of the cored bar 22 and the outer peripheral surface of the disk portion 22a and the inner peripheral surface of the positioning end portion 22b, and the lip 23a of the elastic seal member 23. Is in sliding contact with the second seal member 30. The outer diameter of the first seal member 21 is designed so as to form a clearance for releasing the lubricating oil to the outside with the inner peripheral surface of the outer ring 14. Further, the lip 23a is opened by the air pressure used in the oil mist method, thereby releasing the lubricating oil to the outside.

  The second seal member 30 is a shield plate that is arranged on the inner side in the axial direction than the first seal member 21 and is configured by covering an annular cored bar 31 with an elastic seal member 32 made of an elastic material such as rubber. is there. The core metal 31 is covered with an inner surface and an outer peripheral surface in the axial direction by an elastic seal member 32, and the lip 23 a of the first seal member 21 is in sliding contact with the outer surface in the axial direction of the core metal 31. The inner diameter of the second seal member 30 is designed to form a clearance for releasing the lubricating oil to the outside between the outer peripheral surface of the shoulder portion 12 c of the inner ring member 12.

  The shoulder 12c of the inner ring member 12 is formed in a stepped shape so that the outer peripheral surface is reduced in diameter in two steps toward the outer side in the axial direction. An annular member 25 that extends radially outward from the outer peripheral surface on the inner side in the axial direction of the shoulder 12c is press-fitted and fixed to the outer peripheral surface at the outer end in the axial direction of the shoulder 12c. The annular member 25 includes a cylindrical portion 25a into which the first seal member 21 is fitted, and a flange portion 25b extending axially outside the cylindrical portion 25a and radially outward from the cylindrical portion 25a. The inner ring member 12 is made of a material having a lower hardness than the HRC 50 or higher material.

Further, the C-shaped retaining ring 24 has a mounting annular groove 12f formed by a step portion 12d formed in the shoulder portion 12c and an axially inner end surface of the cylindrical portion 25a of the annular member 25 fixed to the shoulder portion 12c. Attached to.
Since the outer peripheral surface of the shoulder portion 12c to which the annular member 25 is press-fitted and fixed is formed to have a smaller diameter than the outer peripheral surface of the shoulder portion 12c to which the C-shaped retaining ring 24 is attached, the annular member 25 has a step difference in the shoulder portion 12c. By being press-fitted until it hits the part, a mounting annular groove 12f having a predetermined axial width is formed.
The annular member 25 is press-fitted and fixed to the outer peripheral surface of the shoulder portion 12c. To prevent the annular member 25 from moving due to vibration or the like, an annular convex portion 25c is formed on the inner peripheral surface of the annular member 25 in the axially inner side. An annular groove 12e that engages with the annular protrusion 25c is formed at a position corresponding to the protrusion 25c on the outer peripheral surface of the axially outer end of the shoulder 12c.

Accordingly, by attaching the C-shaped retaining ring 24 to the mounting annular groove 12f in a state where the first sealing member 21 is externally fitted to the cylindrical portion 25a of the annular member 25, the first sealing member 21 is secured to the C-shaped retaining ring. It is clamped and fixed between the wheel 24 and the axial wall surface of the flange 25b of the annular member 25. In addition, since the contact surface that contacts the outer peripheral surface of the annular member 25 is configured by the inner peripheral portion 23 c of the elastic seal member 23, the first seal member 21 is formed between the first seal member 21 and the annular member 25. The sealing performance at the contact surface is improved.
Note that the outer peripheral surface of the shoulder portion 12c on the inner side in the axial direction from the mounting annular groove 12f is equal to or smaller than the outer diameter of the outer peripheral surface of the cylindrical portion 25a of the annular member 25 so that the first seal member 21 can be removed. Is set.

  The inner ring side C-shaped retaining ring 24 mounted in the mounting annular groove 12f only needs to have an outer diameter such that the first seal member 21 does not tilt due to air pressure acting on the retaining ring 24. In this embodiment, it has the substantially same outer diameter as the outer peripheral surface of the collar part 25b. This is because if the first seal member 21 is tilted, the rolling water enters the inside of the bearing and causes poor lubrication. As a result, the rolling bearing 10 may be peeled off or locked, and the rolling mill may be stopped.

  As shown in FIG. 4, the C-shaped retaining ring 24 on the inner ring side has an opening 24b between both end portions 24a and 24a, and has projecting portions 24c and 24c protruding in the axial direction at both end portions 24a and 24a. . Further, both end portions 24a and 24a have an inner diameter larger than the inner diameter of the remaining arc portion 24d, and are formed thinner than the radial thickness of the arc portion 24d.

  For this reason, in a state where the C-shaped retaining ring 24 is mounted in the mounting annular groove 12f, the both end portions 24a and 24a do not fit into the outer diameter side opening of the annular groove 12f, and are radially outward from the opening. The protrusions 24c and 24c are positioned so as to be shifted inward in the axial direction with respect to the annular groove 12f.

  Returning to FIG. 3, the inner ring surface of the outer ring 14 has a stepped portion 14 b formed by expanding the outer diameter in the axial direction from the outer ring raceway surface 14 a and a larger size than the inner peripheral surface 14 c of the stepped portion 14 b. An annular groove 14d for mounting in which the C-shaped retaining ring 33 is mounted is formed. Therefore, the second seal member 30 is fixed to the outer ring 14 by mounting the C-shaped retaining ring 33 in the mounting annular groove 14d in a state where the second seal member 30 is positioned at the stepped portion 14b. Also in the second seal member 30, the contact surface that comes into contact with the inner peripheral surface of the outer ring 14 is constituted by the outer peripheral portion 32 a of the elastic seal member 32, so that the second seal member 30 and the inner peripheral surface of the outer ring 14 are in contact with each other. The sealing performance at the contact surface is improved.

  As shown in FIG. 5, the C-shaped retaining ring 33 on the outer ring side has an opening 33b between both end portions 33a and 33a, and has protruding portions 33c and 33c protruding in the axial direction at both end portions 33a and 33a. . Further, both end portions 33a and 33a have an outer diameter smaller than the outer diameter of the remaining arc portion 33d, and are formed thinner than the radial thickness of the arc portion 33d.

  For this reason, in a state where the C-shaped retaining ring 33 is mounted in the mounting annular groove 14d, the both end portions 33a, 33a are positioned on the radially inner side of the opening without fitting into the inner diameter side opening of the annular groove 14d. The protrusions 33c and 33c are arranged so as to be shifted outward in the axial direction with respect to the annular groove 14d.

Here, the process of dividing the rolling bearing 10 for cleaning when removing the backing roll from the rolling mill and regrinding the outer peripheral surface of the outer ring 14 will be described.
As shown in FIG. 6A, first, the rolling bearing 10 removed from the backing roll shaft 5 has a pair of inner ring members 12 and 12 attached with a first seal member 21 and a C-shaped retaining ring 24. Disassemble in the axial direction. As shown in FIG. 6B, the disassembled inner ring member 12 hooks a tool T such as a flat-blade screwdriver on the protruding portion 24c protruding in the axial direction of the C-shaped retaining ring 24 (see FIG. 7). The C-shaped retaining ring 24 is removed from the mounting annular groove 12 f of the inner ring member 12. Thereafter, the first seal member 21 is removed from the inner ring member 12.

  Moreover, as shown in FIG.6 (c), in the outer ring | wheel 14 in the state to which the cylindrical roller 16 and the holder | retainer 18 were attached, the tool T is hooked on the protrusion part 33c which protrudes in the axial direction of the C-shaped retaining ring 33 (FIG. 8), the C-shaped retaining ring 33 is removed from the mounting annular groove 14d of the outer ring 14. Thereafter, the second seal member 30 is removed from the outer ring 14. Further, the cylindrical roller 16 and the cage 18 are sequentially removed from the outer ring 14.

  Thereafter, after regrind of the outer ring 14 and cleaning of each component of the rolling bearing 10, the assembly may be performed in the reverse order of the above steps. That is, the second seal member 30 can be attached and fixed again by fitting the C-shaped retaining ring 33 into the annular groove 14d, and the first sealing member 21 can be fitted with the C-shaped retaining ring 24 in the annular groove 12f. Can be attached and fixed again.

  Here, in the inner ring member 12, the annular member 25 that is press-fitted and fixed protrudes radially outward from the outer peripheral surface of the shoulder 12c, and may collide with other parts during transport for cleaning. The annular member 25 is a separate component from the inner ring member 12 and has low hardness, so that damage can be suppressed even when an impact is applied.

  As described above, according to the outer ring rotary rolling bearing 10 of the present embodiment, the shoulder portion 12c of the inner ring member 12 is press-fitted and fixed to the outer peripheral surface of the axially outer end portion of the shoulder portion 12c. An annular member 25 extending radially outward from the outer peripheral surface of 12c, and detachably attached to the shoulder portion 12c on the axially inner side of the annular member 25. The first seal cooperates with the annular member 25 And a C-shaped retaining ring 24 that can be fixed by sandwiching the member 21. Accordingly, the first seal member 21 can be easily removed from the inner ring member 12 by removing the C-shaped retaining ring 24, and the first seal member 21 can be removed by attaching the C-shaped retaining ring 24. Can be easily fixed. Further, the annular member 25 located at the outer end in the axial direction of the shoulder 12c of the inner ring member 12 is configured separately from the inner ring member 12 in order to fix the first seal member 21, so that it can be conveyed during transportation. Even when an impact is applied to the annular member 25 located on the outer side in the axial direction, damage can be suppressed. An annular convex portion 25c is formed on the inner peripheral surface of the annular member 25, and an annular groove portion engaged with the annular convex portion 25c is formed on the outer peripheral surface of the axially outer end portion of the shoulder portion 12c. Since 12e is formed, the annular member can be prevented from moving due to vibration or the like, and the first seal member 21 can be reliably fixed without being affected by vibration or the like. Further, since the annular member 25 is made of a material having lower hardness than the inner ring member 12, it is difficult to be damaged by an impact.

  Furthermore, according to the rolling mill 1 provided with the backing roll having the outer ring rolling bearing 10, the bearing from which the seal device 20 is removed can be easily disassembled and cleaned when the outer peripheral surface of the outer ring is regrinded.

  In addition, the outer peripheral surface of the shoulder portion 12c to which the annular member 25 is press-fitted and fixed is formed to have a smaller diameter than the outer peripheral surface of the shoulder portion 12c to which the C-shaped retaining ring 24 is attached, and the annular member 25 is the first seal member 21. Has a cylindrical portion 25a, and a flange portion 25b extending axially outward from the cylindrical portion 25a and radially outward from the cylindrical portion 25a. The C-shaped retaining ring 24 has a shoulder portion 12c. Are attached to the mounting annular groove 12f formed by the step portion 12d formed on the inner surface and the axially inner end surface of the cylindrical portion 25a. Accordingly, the mounting annular groove 12f is configured by press-fitting the annular member 25 into the outer peripheral surface of the shoulder portion 12c, and the first seal member 21 is attached to the inner ring by attaching the C-shaped retaining ring 24 to the mounting annular groove 12f. The first seal member 21 can be easily detached by removing the C-shaped retaining ring 24 and securely attaching and fixing to the member 12. Furthermore, the outer peripheral surface of the shoulder 12c can be easily processed.

  As a modification of the first embodiment, as shown in FIG. 9, a floating ring 40 may be disposed between the two rows of cylindrical rollers 16 on the inner ring 11 side. The floating ring 40 is made of a steel material such as alloy steel and has a cross-sectional shape having a convex portion on the inside, and the axial width of the outer peripheral surface is substantially equal to the axial width of the outer ring flange portion 14e. The width of the peripheral surface is made smaller than the width of the bearing grooves 12b, 12b formed on the inner peripheral surfaces of the inner ring members 12, 12, and the side surfaces on both sides of the convex portions are tapered surfaces that extend radially from the width of the inner peripheral surface. Mold. The float 40 cooperates with the shoulder portions 12c and 12c of the inner ring members 12 and 12 and the outer ring flange portion 14e to restrict the axial movement of the cylindrical rollers 16 in each row and prevent the cylindrical rollers 16 from skewing. .

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved. Moreover, each embodiment mentioned above is applicable in combination in the range which can be implemented.

The member for fixing a seal member of the present invention is not limited to the retaining ring of the present embodiment, and the first seal member may be fixed using other members such as bolts.
Moreover, although the outer ring | wheel rotation type rolling bearing of this invention was used as the double row rolling bearing in this embodiment, it may be a single row or a multi-row rolling bearing of 3 rows or 4 rows in the axial direction. Further, in the present embodiment, the description has been given using the cylindrical roller bearing in which the rolling element is a cylindrical roller.

  In the present embodiment, the rolling bearing of the present invention is applied to the backing roll portion of a multi-stage rolling mill in which the outer ring is rotated, the inner ring is stationary, and the outer ring is used directly as a roll. Applicable to various rolling bearings used in rolling mills. The present invention can be applied to all other rolling bearings used in general industries (paper mills, power generation plants (wind power, thermal power), etc., vehicles (railroads, construction machines, transporting machines), and the like.

DESCRIPTION OF SYMBOLS 5 Backing roll axis | shaft 10 Outer ring rotation type rolling bearing 11 Inner ring 12 Inner ring member 12a Inner ring raceway surface 12c Shoulder part 12d Step part 12f Mounting annular groove 14 Outer ring 14a Outer ring raceway surface 16 Cylindrical roller (rolling element)
18 Cage 20 Sealing Device 21 First Seal Member 22 Core Bar 23 Elastic Seal Member (Elastic Member)
24, 33 C-shaped retaining ring 25 Annular member 30 Second seal member 31 Core metal 32 Elastic seal member (elastic member)

Claims (5)

An inner ring having an inner ring raceway surface on the outer peripheral surface;
An outer ring having an outer ring raceway surface on the inner circumferential surface;
A plurality of rolling elements arranged so as to be freely rollable between the outer ring raceway surface and the inner ring raceway surface;
A first seal member attached to the inner ring, and a second seal member attached to the outer ring, wherein the elastic seal member provided on one of the first and second seal members includes the first and second seal members. A sealing device in sliding contact with the other of the second sealing members;
An outer ring rotation type rolling bearing used in outer ring rotation,
On the shoulder of the inner ring,
An annular member that is press-fitted and fixed to the outer peripheral surface of the axially outer end of the shoulder, and extends radially outward from the outer peripheral surface of the shoulder;
A seal member fixing member that is detachably attached to the shoulder portion on the inner side in the axial direction than the annular member, and capable of clamping and fixing the first seal member in cooperation with the annular member;
Is provided,
An annular convex portion is formed on the inner peripheral surface of the annular member, and an annular groove portion that engages with the annular convex portion is formed on the outer peripheral surface of the axially outer end portion of the shoulder portion. An outer ring rotation type rolling bearing.   The outer ring rolling bearing according to claim 1, wherein the annular member is made of a material having a hardness lower than that of the inner ring. The outer peripheral surface of the shoulder portion to which the annular member is press-fitted and fixed is formed with a smaller diameter than the outer peripheral surface of the shoulder portion to which the sealing member fixing member is attached,
The annular member has a cylindrical part to which the first seal member is fitted, and a flange part that extends axially outside the cylindrical part and radially outward from the cylindrical part,
The said sealing member fixing member is attached to the mounting | wearing annular groove formed by the level | step-difference part formed in the said shoulder part, and the axial direction inner end surface of the said cylindrical part. 2. An outer ring rolling bearing according to 2. The inner ring includes a pair of inner ring members that can be divided in the axial direction,
The first seal member is removed from the inner ring member by removing the seal member fixing member from the inner ring member after separating the inner ring member from the rolling bearing. The outer ring | wheel rotation type rolling bearing of any one of Claim 3.   A rolling mill comprising a backing roll having the outer ring rotary rolling bearing according to any one of claims 1 to 4.

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