JP2004011661A - Double row cylindrical roller bearing - Google Patents

Abstract

A double-row cylindrical roller bearing having an inner race having a flat inner raceway surface formed thereon and a brim ring disposed on the side of the inner race is greatly improved, and the bearing is easily and reliably provided. The present invention provides a double-row cylindrical roller bearing suitable for use in a multi-high rolling mill or the like in which bearing maintenance is frequently performed.
A double row cylindrical roller bearing (30) of the present invention sets the width (W1) of an inner ring (32) wider than the outer width dimension (W2) of a double row cylindrical rolling element (33) assembled to an outer ring (31). A slender portion 32b was formed in which the outer diameter gradually decreased as it approached the end 32c of the surface 32a. Further, a counterbore portion 34a having a depth L2 greater than the axial length L1 of the smooth portion 32b is formed on the collar ring 34, and the collar 34 is disposed on the side of the inner ring 32 to form a counterbore portion. The slender portion 32b is covered by 34a.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a double-row cylindrical roller bearing, and more particularly to a bearing having an inner ring having a flat inner raceway surface formed thereon and a brim ring arranged on a side of the inner ring. The present invention relates to a double-row cylindrical roller bearing that can be easily assembled and is suitable for use in a multi-high rolling mill or the like that performs frequent maintenance.
[0002]
[Prior art]
As shown in FIG. 4, a conventional multi-high rolling mill 1 is provided with a pair of work rolls 2 that sandwich and press a material to be rolled and form a thin film. Behind the work roll 2, a plurality of first intermediate rolls 3, second intermediate rolls 4, and backup rolls 5 are arranged to support a strong rolling force received by the work roll 2. I have.
The rotary structure of the first intermediate roll 3, the second intermediate roll 4, and the backup roll 5 supplies the lubricating oil to the double row cylindrical roller bearing 8 as shown in FIG. A double-row cylindrical roller bearing 8 is rotatably arranged on a support shaft 6 provided with a number of lubrication holes 6a. Then, the outer ring is brought into contact with the preceding roll to rotate the outer ring, so that a load acting on the work roll 2 is received.
[0003]
As the bearing used in the multi-high rolling mill 1, various types of double-row cylindrical roller bearings 8 are used in consideration of the use environment and the bearing life. Since the double-row cylindrical roller bearing 8 is used under a high temperature, a high load, and in a bad environment in which a large amount of cooling water is scattered, it is periodically disassembled and inspected for damage. Maintenance work to repair the most easily damaged outer ring, such as regrind, was essential. Therefore, the double row cylindrical roller bearing 8 is required to be easily disassembled and assembled.
[0004]
As shown in FIG. 6, a double-row cylindrical roller bearing 10 which is an example of a conventional bearing has an outer ring 11 having outer ring raceway surfaces 11a formed on both sides of a convex portion 11b provided at the center in the width direction of the inner diameter portion. And two inner rings 12 each having an inner raceway surface 12a formed on the outer diameter portion, and a collar 12b formed on one side of the inner raceway surface 12a.
Further, a plurality of cylindrical rollers 13 are provided between the outer raceway surface 11a and the inner raceway surface 12a so as to roll freely in two rows.
[0005]
The double-row cylindrical roller bearing 10 is assembled by inserting a cage 15 into the outer ring 11, incorporating a plurality of cylindrical rollers 13 from both sides of the outer ring 11 into the cage 15, and then forming a pair of inner rings 12 from both sides. By assembling and abutting the end surfaces 12d, the cylindrical roller 13 is rotatably mounted between the outer raceway surface 11a and the inner raceway surface 12a.
A chamfered portion 12c is provided at a corner between the end surface 12d of the inner ring 12 on the opposite side of the flange 12b and the outer diameter portion, so that the inner ring 12 can be easily inserted from the axial direction. The inner ring 12 can be assembled smoothly without being guided by the chamfered portion 12c, and the corners do not interfere with the side surface of the cylindrical roller 13.
A plurality of concave portions 12e are formed in the end surface 12d on the chamfered portion 12c side in the radial direction, and when the end surfaces 12d abut each other, an oil supply hole 12f is formed by the two concave portions 12e.
[0006]
As shown in FIG. 7, a double-row cylindrical roller bearing 20 as another example has an outer ring 21 having outer ring raceway surfaces 21a formed on both sides of a convex portion 21b provided at the center in the width direction of the inner diameter portion. An inner raceway surface 22a is formed in the outer diameter portion in a flat shape without a step over the entire length in a cross-sectional shape along the axis, and the inner race 22 is provided.
Further, a plurality of cylindrical rollers 23, which are rotatably arranged in two rows between the outer raceway surface 21 a and the inner raceway surface 22 a and are arranged and held at predetermined intervals in the circumferential direction by the retainer 25, And a pair of brim rings 24 arranged in contact with both sides of the collar.
[0007]
The width of the inner race 22 is set to be substantially the same as the outer width of the two rows of cylindrical rollers 23 assembled to the outer race 21.
An oil supply groove 22b is provided substantially at the center in the width direction of the inner diameter portion, and a plurality of oil supply holes 22c are formed in the radial direction by penetrating the oil supply groove 22b and the inner raceway surface 22a. Lubricating oil is supplied to the raceway surface via the lubrication hole 22b and the lubrication hole 22c.
The outer diameter of the collar ring 24 is set to be larger than the outer diameter of the inner raceway surface 22a of the inner ring 22, and slides against the outer side surface of the cylindrical roller 23 to prevent the cylindrical roller 23 from moving in the axial direction. It is supposed to.
[0008]
The double-row cylindrical roller bearing 20 is assembled by inserting a retainer 25 into the outer ring 21, incorporating a plurality of cylindrical rollers 23 from both sides of the outer ring 21 into the retainer 25, and then forming a pair of inner rings 22 from both sides. The cylindrical roller 23 is assembled so as to be rollable between the outer raceway surface 21a and the inner raceway surface 22a by assembling and finally assembling a pair of brim rings 24 from the outside of the inner race 22.
[0009]
[Problems to be solved by the invention]
In the conventional double row cylindrical roller bearing 20 having the collar ring 24, the entire surface up to the end of the outer diameter surface of the inner ring 22 is a running surface of the cylindrical roller 23, and functions as an inner ring raceway surface 22a.
Therefore, it is not possible to provide a rounded portion such as a chamfer at the end of the outer diameter surface, and it is difficult to assemble the double-row cylindrical roller bearing 20 by assembling the corner of the outer diameter surface with the cylindrical roller 23 when assembling the double row cylindrical roller bearing 20. There was a problem.
In particular, in a bearing used for a multi-high rolling mill or the like that requires frequent disassembly and assembly, the inner ring 22 may be forcibly pressed and assembled due to difficulty in assembling. There is a possibility that the end of the outer diameter surface which is a part of the raceway surface 22a may be damaged. Therefore, there is a possibility that the life of the double row cylindrical roller bearing 20 may be shortened.
Further, the disassembly and assembly of the double-row cylindrical roller bearing 20 must be performed with great care, which increases the number of man-hours required for maintenance and requires improvement from the viewpoint of cost.
[0010]
The present invention has been made in view of the above-described problems, and has as its object to provide a double-row cylindrical roller bearing that can be easily and reliably disassembled and assembled and has excellent maintainability.
[0011]
[Means for Solving the Problems]
The double-row cylindrical roller bearing according to claim 1 of the present invention has an outer race in which a plurality of rows of outer raceway surfaces are formed in an inner diameter portion, and an inner raceway surface as a flat surface having no steps over the entire length in a cross-sectional shape along the axis. A double row cylindrical roller comprising an inner ring formed in an outer diameter portion, and a plurality of cylindrical rolling elements arranged in a plurality of rows between the outer ring raceway surface and the inner ring raceway surface and rotatably mounted. In the bearing, a slack portion whose width is set to be wider than the outer width of the double-row cylindrical rolling elements assembled to the outer ring, and whose outer diameter gradually decreases as it approaches the end of the outer diameter. The inner ring formed with the inner ring, a counterbore portion having an inner diameter larger than the outer diameter of the inner ring, and a counterbore portion deeper than the axial length of the slender portion is formed, and the slenderness is arranged on the side of the inner ring. Collar configured so that the counterbore part covers the part Characterized in that it comprises and.
[0012]
According to the double-row cylindrical roller bearing having the above-described configuration, a plurality of cylindrical rolling elements are applied to the inner ring raceway surface because the flared portion whose outer diameter dimension gradually decreases as it goes to the end of the inner raceway surface. The double-row cylindrical roller bearing can be easily assembled without causing damage to the inner ring raceway surface by moving the inner ring in the axial direction while contacting and guiding at the slack portion.
Further, the disassembly and assembly of the double-row cylindrical roller bearing can be easily performed, and the maintenance performance of the multi-stage rolling mill or the like can be improved, so that the maintenance of the double-row cylindrical roller bearing can be performed in a short time and at low cost.
Also, the width of the inner ring is set wider than the outer width of the double-row cylindrical rolling element assembled to the outer ring, and the outer diameter gradually decreases as it goes to the end of the inner ring raceway surface. In addition to forming the part, a counterbore part deeper than the axial length of the slender part is formed in the collar ring, so that the collar ring is arranged on the side of the inner ring, so that the slender part is formed by the counterbore part. Can be completely covered. Therefore, a stable rotation can be obtained by reliably rolling on the inner ring raceway surface without rolling the cylindrical rolling element on the flared portion.
[0013]
The double row cylindrical roller bearing according to claim 2 of the present invention is characterized in that the slender portion has a chamfer whose outer diameter gradually decreases as it goes toward the end. Cylindrical roller bearing.
[0014]
According to the double-row cylindrical roller bearing having the above-described configuration, the slender portions formed at both ends of the inner ring are chamfered with a simple shape, so that the slender portion can be processed very easily, and the inner ring can be manufactured at low cost. And at the same time, the assemblability of the inner ring can be greatly improved.
[0015]
The double row cylindrical roller bearing according to claim 3 of the present invention, wherein the slender portion is a round chamfer in which a corner between an end face and the outer diameter portion is processed into an arc-shaped cross section. Double row cylindrical roller bearing as described.
[0016]
According to the double-row cylindrical roller bearing having the above-described configuration, the chamfer is applied to the end of the outer diameter portion of the inner ring, so that the inner ring is axially moved by bringing the cylindrical rolling element into contact with the inner ring rolling surface. When assembling the double row cylindrical roller bearing, it can be assembled in a short time without damaging the end of the outer diameter portion and the cylindrical rolling element. Further, the slender portion can be easily processed.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a double row cylindrical roller bearing of the present invention will be described in detail with reference to FIGS. FIG. 1 is a longitudinal sectional view of a main part of a double row cylindrical roller bearing according to an embodiment of the present invention, FIG. 2 is an enlarged view of a main part showing a first embodiment of a slender part in FIG. 1, and FIG. It is a principal part enlarged view which shows 2nd Embodiment of this.
As shown in FIG. 1, a double row cylindrical roller bearing 30 according to an embodiment of the present invention includes an outer ring 31, an inner ring 32, a cylindrical roller 33 which is a cylindrical rolling element, a collar ring 34, and a retainer 35. It is composed of
The outer ring 31 has outer ring raceway surfaces 31a formed on both sides of a convex portion 31b provided substantially at the center of the inner diameter portion in the width direction. An annular relief groove 31c is provided at a corner between the outer raceway surface 31a and the side surface of the projection 31b so that the corner of the cylindrical roller 33 does not interfere.
[0018]
The inner race 32 has a cross-sectional shape along the axis, in which an inner raceway surface 32a is formed in an outer diameter portion in a flat shape with no steps over the entire length. The width dimension W1 of the inner race 32 is set wider than the dimension W2 between the outer end faces of the two rows of cylindrical rollers 33 assembled to the outer race 31. A slender portion 32b is formed at a corner between the both side surfaces 32c and the inner raceway surface 32a.
[0019]
As shown in FIG. 2, the shape of the slender portion 32b according to the first embodiment is a chamfer 32d that is tapered so that the outer diameter gradually decreases as the corners face the ends.
[0020]
As shown in FIG. 3, the shape of the slender portion 32b according to the second embodiment is a round chamfer 32e in which a corner is machined into an arc-shaped cross section.
Further, as shown in FIG. 1, the axial length L1 of the slender portion 32b is (the width W2 of the inner ring 32, the dimension W2 between the outer end faces of the cylindrical rollers 33 of the second and third rows) / 2, and the roller is chamfered. It is set smaller than the sum of the dimensions L3 (L1 ≦ (W1−W2) / 2 + L3).
[0021]
The cylindrical rollers 33 are arranged in two rows between the outer raceway surface 31a and the inner raceway surface 32a so as to roll freely. Each inner end surface 33a of the cylindrical roller 33 comes into contact with a side surface of a convex portion 31b formed on the outer race 31, and movement in a direction approaching each other is restricted. The cylindrical rollers 33 are arranged and held at predetermined intervals in a circumferential direction by a holder 35.
[0022]
As shown in FIGS. 2 and 3, the collar ring 34 has an inner diameter dimension DS larger than the outer diameter dimension DI of the inner ring 32, and is formed with a circular counterbore portion 34 a having a depth L <b> 2. Has become.
When the bottom portion 34b of the counterbore portion 34a is assembled by abutting the side surface 32c of the inner race 32, the counterbore portion 34a covers the slender portion 32b (32d, 32e), and the end face 34c is attached to the cylindrical roller 33. And restricts movement of the cylindrical rollers 33 in a direction away from each other.
[0023]
The first embodiment shown in FIG. 2 is different from the second embodiment shown in FIG. 3 only in that the shape of the slender portion 32b is a straight chamfer 32d and a round chamfer 32e, and the other portions are not described. Therefore, the same portions are denoted by the same reference numerals and description thereof will be omitted.
[0024]
The operation of the above embodiment will be described.
As shown in FIG. 1, when assembling the double row cylindrical roller bearing 30, the retainer 35 is inserted into the outer ring 31, and the plurality of cylindrical rollers 33 are assembled into the retainer 35 from both sides of the outer ring 31. Therefore, a pair of inner rings 32 are assembled from both sides.
At this time, as shown in FIGS. 2 and 3, a slack portion 32b (chamfer 32d or round chamfer 32e) is formed on the side surface 32c of the inner race 32 so that the outer diameter gradually decreases as the inner ring 32 faces the side surface 32c. Since the cylindrical rollers 33 are formed, the cylindrical rollers 33 are guided and pressed into the slack portions 32b, and the cylindrical rollers 33 do not interfere with the corners of the inner race 32. Therefore, it is possible to assemble the inner raceway surface 32a and the outer diameter surfaces of the cylindrical rollers 33 without damaging dents or indentations.
Finally, a pair of brim rings 34 are assembled from the outside of the inner ring 32 by abutting the bottom portions 34b of the counterbore portions 34a on both side surfaces 32c of the inner ring 32, and the cylindrical rollers 33 are connected to the outer ring raceway surface 31a and the inner raceway Rollably mounted between the surfaces 32a.
[0025]
The inner diameter DS of the counterbore part 34a of the collar ring 34 is larger than the outer diameter dimension DI of the inner ring 32, and the depth L2 of the counterbore part 34a is the axial length L1 of the slender part 32b (32d, 32e). The slender portion 32b is incorporated with being completely covered by the counterbore portion 34a, and is accommodated in the counterbore portion 34a.
When the cylindrical roller 33 rolls on the inner ring raceway surface 32a, the outer side surface of the cylindrical roller 33 contacts the end surface 34c of the collar ring 34 to restrict the cylindrical roller 33 from moving in the direction away from each other. In addition, the cylindrical roller 33 does not roll on the slack portion 32b.
As described above, the slack portion 32b is formed in the outer diameter portion of the inner ring 32 to facilitate the incorporation of the cylindrical roller 33, greatly improve the assemblability of the double row cylindrical roller bearing 30, and increase The contact with the slack portion 32b is prevented, and the rolling can be reliably performed on the inner raceway surface 32a to smoothly rotate.
[0026]
Although the double-row cylindrical roller bearing of the present invention has been described as a double-row cylindrical roller bearing in the above embodiment, the present invention is not limited to this. For example, a four-row cylindrical roller bearing or the like may be used.
[0027]
【The invention's effect】
As described above, according to the double-row cylindrical roller bearing according to the first aspect of the present invention, the flared portion whose outer diameter gradually decreases as it goes to the end of the inner raceway surface is formed. Therefore, a plurality of cylindrical rolling elements can be brought into contact with the inner ring raceway surface, and the inner ring can be moved in the axial direction while being guided by the slack portion, and can be assembled without damaging the inner raceway surface. Accordingly, the disassembly and assembly of the double-row cylindrical roller bearing can be easily performed, and the maintainability of the multi-stage rolling mill or the like can be greatly improved, and the maintenance of the double-row cylindrical roller bearing can be performed in a short time and at low cost.
[0028]
Also, the width of the inner ring is set wider than the outer width dimension of the double row cylindrical rolling element assembled to the outer ring, and the outer diameter dimension gradually decreases as both ends of the inner ring raceway face the ends. In addition to forming a smooth portion, a counterbore portion is formed on the collar ring, and the counterbore portion of the collar ring is arranged so as to abut on the side of the inner ring.
Therefore, the slack portion can be covered by the counterbore portion, and the cylindrical rolling element can reliably roll on the inner ring raceway surface without rolling on the slack portion to obtain stable rotation for a long period of time. it can.
[0029]
According to the double-row cylindrical roller bearing according to the second aspect of the present invention, since the smooth portions formed at both ends of the inner ring are chamfered, the smooth portions can be processed very easily, and the inner ring can be manufactured at low cost. And at the same time, the assemblability of the inner ring can be greatly improved.
[0030]
According to the double-row cylindrical roller bearing according to the third aspect of the present invention, since rounded chamfering is performed on the end of the outer diameter portion of the inner ring, the cylindrical rolling element is brought into contact with the inner ring raceway surface, and the inner ring is axially moved. When the double row cylindrical roller bearing is assembled by moving the inner ring, the inner ring can be assembled without damaging the end of the outer diameter portion, and the slack portion can be easily processed.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a main part showing a double-row cylindrical roller bearing of the present invention.
FIG. 2 is an enlarged view of a main part showing a first embodiment of a slender part in FIG. 1;
FIG. 3 is an enlarged view of a main part showing a second embodiment of the slender part in FIG. 1;
FIG. 4 is a schematic diagram showing a configuration of a roll of a conventional multi-high rolling mill.
FIG. 5 is a partial cutaway view showing a backup roll in FIG. 4;
FIG. 6 is a longitudinal sectional view showing a main part of a conventional double-row cylindrical roller bearing.
FIG. 7 is a longitudinal sectional view showing a main part of another conventional double-row cylindrical roller bearing.
[Explanation of symbols]
Reference Signs List 30 double row cylindrical roller bearing 31 outer ring 31a outer ring raceway surface 32 inner ring 32a inner ring raceway surface 32b flared portion 32c inner ring side surface 32d chamfer 32e radius chamfer 33 cylindrical roller 34 as an example of a cylindrical rolling element collar ring 34a counterbore portion DI inner ring Outer diameter DS Inner diameter L1 of counterbore part Length in axial direction L2 Depth of counterbore part W1 Inner ring width W2 Outer width of two rows of cylindrical rollers

Claims (3)

An outer ring in which a plurality of rows of outer ring raceway surfaces are formed in an inner diameter portion, an inner ring in which an inner ring raceway surface is formed in an outer diameter portion as a plane having no steps over the entire length in a cross-sectional shape along the axis, and the outer ring raceway surface; A double-row cylindrical roller bearing comprising a plurality of cylindrical rolling elements arranged in a plurality of rows and rotatably mounted between the inner ring raceway surface;
A slender portion is formed which is set wider than the outer width dimension of the double-row cylindrical rolling elements assembled to the outer race, and whose outer diameter dimension gradually decreases toward the end of the outer diameter section. The inner ring has an inner diameter larger than the outer diameter of the inner ring, and a counterbore portion deeper than the axial length of the slender portion is formed, and the slender portion is arranged at a side of the inner ring. A double-row cylindrical roller bearing, comprising: a brim ring configured to cover a spot facing portion. 2. The double-row cylindrical roller bearing according to claim 1, wherein the slender portion has a chamfer whose outer diameter gradually decreases as it goes toward an end. 3. 2. The double-row cylindrical roller bearing according to claim 1, wherein the flared portion is a round chamfer in which a corner between an end face and the outer diameter portion is processed into an arc-shaped cross section. 3.

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