JPH1085809A - Sealed type roller bearing of rolling mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed type roller bearing of a rolling mill which is protected from entering of water or the like into the bearing at the time of the operation stop and low speed rotation of the rolling mill. SOLUTION: In this sealed type roller bearing, by arranging superimposing plural inside annular bodies having an outward flange in the end part of an inner race, superimposing plural outside annular bodies having an inward flange in the axial direction and arranging them concentrically with the inside annular bodies and alternately arranging the outward flange and the inward flange so that the outward flange is situated in both end parts in the axial direction, a noncontact sealing device which is made into a labrynth by a clearance between these flanges is formed. In such a case, by bringing the outer peripheral part of the outward flange 5a of the inside annular body 5 which is situated between the inward flanges 7a, 8a of two adjacent outside annular bodies 7, 8 into slide-contact with the inner peripheral part of at least one outside annular body 8 of the two outside annular bodies 7, 8, a contact-seal part 16 is formed in the non-contact sealing device 10 and at least one peripheral surface side of the inside annular body 5 and the outside annular body 8 in this slide-contact part is made from a lubricative non-metallic base stock.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed roller bearing in a rolling mill.

[0002]

2. Description of the Related Art Conventionally, as a sealed roller bearing in a rolling mill, one disclosed in Japanese Patent Publication No. 3-66963 shown in FIGS. 4 and 5 is known. The conventional bearing 40 is a four-row tapered roller bearing that supports a roll neck 41 of a rolling mill in an axle box 54. At both ends of the bearing 40, the inner ring 4
An extension ring 42a extending in the axial direction from the end face of the outer ring 43 is formed on the small collar side of the second ring 2.
Three inner annular bodies 44, 45, 46 having outward flanges 44a, 45a, 46a, respectively, are fitted externally in a state of being overlapped and connected in the axial direction. On the end face side of the outer ring 43, two outer rings 47, 48 having inward flanges 47a, 48a, respectively, are provided with inner rings 44, 45,.
It is located in a state of being concentrically overlapped with 46 and axially superposed. The plurality of outward flanges 44a, 44
5a, 46a and a plurality of inward flanges 47a, 48a
Are arranged so that outward flanges 44a and 44c are located at both ends in the axial direction and are alternately arranged in parallel. Thus, a labyrinth 49 is formed between the outer peripheral portions of the inner annular members 44, 45, 46 and the inner peripheral portions of the outer annular members 47, 48,
A non-contact sealing device 50 is configured.

In addition, the three inner rings 44, 45, 4
6, the inner ring 44 closest to the inside of the bearing is the inner ring 42.
The other inner ring members 45 and 46 are fastened and fixed to the inner ring member 54 with screws 51 so as to be separable. Two more outer rings 4
7 and 48 are fastened by screws 52 so as to be separable, and the outer ring body 47 on the inner side of the bearing and the outer ring 43 are detachably spliced to the end face of the outer ring 43. Reference numeral 53 denotes an O-ring, which is fitted into a peripheral groove 55 formed on the outer peripheral portion of the outer ring body 47 to seal the inner peripheral surface of the shaft box 54 and the outer peripheral surface of the outer ring body 47. Reference numeral 55 denotes a tapered roller interposed between the inner and outer rings.

[0004]

However, in the above-described bearing 40, when the rolling mill rotates at high speed, a strong air curtain is created in the non-contact sealing device 50, and cooling water and dust used in the rolling mill are removed. Intrusion into the bearing 40 is prevented, and high sealing performance is obtained. However, because of the labyrinth configuration, water or the like accumulated in the non-contact sealing device 50 when the operation of the rolling mill is stopped may enter the bearing 40 through the labyrinth at the start of operation. further,
Even when the rolling mill is operated at a low speed according to the rolling schedule, the air curtain of the non-contact sealing device 50 is weak,
Water or the like may enter the inside of the bearing 40.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sealed roller bearing in a rolling mill that prevents water or the like from entering the inside of the bearing when the rolling mill is stopped or rotates at a low speed.

[0006]

Means for Solving the Problems As means for solving the above-mentioned problems, a plurality of inner rings having outward flanges are axially superposed and arranged at the end of the inner ring, and are arranged at the end of the outer ring. A plurality of outer rings having an inward flange are superposed in the axial direction and arranged concentrically with the inner ring, and the outward flange and the inward flange are alternately arranged so that the outward flanges are located at both ends in the axial direction. In a sealed roller bearing in a rolling mill arranged to form a non-contact sealing device which is formed as a labyrinth by a clearance between these flanges, an outer ring of an inner ring located between inward flanges of two adjacent outer rings. The outer peripheral portion of the orientation flange is slidably contacted with the inner peripheral surface of at least one of the two outer annular members to form a contact sealing portion inside the non-contact sealing device, and the inner side of the sliding contact portion is formed. Ring and outside At least one of the circumferential surface of the ring member is characterized by comprising the lubricating non-metallic material. In addition, it is preferable to form the inner ring which is in sliding contact with the inner peripheral surface of the outer ring with a lubricating nonmetallic material itself such as a polytetrafluoroethylene (PTFE) material or a hard phenol resin. . Further, at least one peripheral surface of the inner ring and the outer ring in the sliding contact portion may be coated with the lubricating nonmetallic material.

In the above-mentioned sealed roller bearing of the rolling mill, the inner peripheral surface between the flanges of the two adjacent outer ring members is formed in a parallel plane parallel to the axis, and the outer ring member is slidably contacted with the outer ring member. The outer peripheral portion of the outward flange of the inner ring that is in contact with the outer ring is formed in a bent portion parallel to the axis, and the bent portion is slidably contacted with a parallel surface of the outer ring.

Further, in the above-mentioned sealed roller bearing in the rolling mill, a circumferential concave step portion is formed opposite to an inner peripheral portion of each mating surface of the two adjacent outer ring members,
A circumferential concave step of one outer ring is formed on an inclined surface, and an outer peripheral portion of an outward flange of an inner ring which is in sliding contact with the outer ring is brought into sliding contact with the inclined surface. And

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. 1 and 2 show one embodiment according to the present invention. As a sealed roller bearing in a rolling mill, a four-row tapered roller bearing 1 that supports a roll neck (not shown) of a rolling mill in an axle box (not shown) is described. At the left and right ends of the bearing 1, the inner ring 2
An extension ring portion 2a extending in the axial direction from the end surface of the outer ring 3 is formed at the small flange side end portion of the outer ring 3. 22 is inner and outer rings 2 and 3
It is a tapered roller interposed between them.

On the other hand, a plurality of (three in this embodiment) inner rings 4, 5, 6 each having outward flanges 4a, 5a, 6a are overlapped in the axial direction and connected to each other to form the inner ring 2 as described above. Is fitted on the outer peripheral surface of the extension ring portion 2a. A plurality of (two in this embodiment) metal outer rings 7, 8 each having inward flanges 7a, 8a are concentric with the inner rings 4, 5, 6 on the end face side of the outer ring 3. They are positioned in a state of being connected in a state of being superposed in the axial direction. The three outward flanges 4a, 5a, 6a and the two inward flanges 7a, 8a are alternately arranged in parallel so that the outward flanges 4a, 5a are located at both ends in the axial direction.
A labyrinth 9 is formed by the gap between these flanges. That is, the inner rings 4, 5, 6 and the outer rings 7, 8 are arranged such that the parallel order of the flanges arranged from the inside to the outside of the bearing 1 starts from the outward flange 4a and ends at the outward flange 6a. Have been. This aims at that water and the like are shaken off by the outward flange 6a by the centrifugal force during the rotation of the bearing.

Further, of the three inner rings 4, 5 and 6, the inner ring 4 closest to the inside of the bearing is fixed to the extended ring portion 2a of the inner ring 2 by shrink fitting. The bodies 5 and 6 are fastened and fixed to the shrink-fitted inner ring 4 by screws 11 so as to be separable when the bearing is disassembled, and loosely fitted to the extension ring 2a of the inner race 2. Two more outer rings 7,
8 is fastened by a screw 12 so that it can be separated when the bearing is disassembled, and the outer ring 7 on the inner side of the bearing and the outer ring 3 are detachably connected to the end face of the outer ring 3 by a spigot connection 14. The O-ring 13 is fitted into a peripheral groove 15 formed on the outer peripheral portion of the outer ring member 7 to seal the inner peripheral surface of the axle box and the outer peripheral surface of the outer ring member 7.

Of the three inner rings 4, 5, and 6, two inner rings 4, 6 located at both ends in the axial direction are made of metal and have an L-shaped cross section to maintain strength. And the stability at the time of fitting is ensured. The cylindrical portions 4b and 6b of the L-shaped inner ring members 4 and 6 face each other and are fitted to the extended ring member 2a of the inner ring 2, and a disk-shaped inner ring member is provided between the cylindrical portions 4b and 6b. 5 is pinched.

The disk-shaped inner ring 5 is formed of a lubricating non-metallic material such as a polytetrafluoroethylene (PTFE) material or a hard phenol resin, and its outer peripheral portion is formed inside the outer ring 8. It is lightly slid on the peripheral surface. Thereby, the contact sealing portion 1 is provided inside the non-contact sealing device 10.
6 are formed. The inner ring 5 may be formed of metal and the surface thereof may be coated with the above-mentioned lubricating non-metallic material. It may be coated with a lubricating non-metallic material.

The disc-shaped inner ring 5 and outer rings 7, 8
Is in the following state. That is, the inner peripheral surfaces 7b and 8b between the flanges 7a and 8a of the two adjacent outer rings 7 and 8 are formed on parallel surfaces having the same diameter and parallel to the bearing axis, respectively. Inner ring 5 in contact
The outer peripheral portion of the outward flange 5a is also formed as a bent portion 17 parallel to the bearing axis, and the bent portion 17 is slidably contacted with the parallel surface of the one outer ring body 8. Note that the bent portion 17 of the inner ring 5 may be slid over the parallel surfaces of the outer rings 7 and 8. In the case of this embodiment, since the sliding contact surface between the inner ring 5 and the outer ring 8 is parallel to the bearing axis,
Even if there is play in the axial direction, there is no change in the light interference of the sliding contact portion, and it is kept constant.

FIG. 3 shows another embodiment in which the disc-shaped inner ring 5 and the outer rings 7, 8 are in sliding contact with each other. That is, the respective mating surfaces 18, 1 of the two adjacent outer rings 7, 8 described above.
9 are formed on the inner peripheral portion, respectively, and opposed circumferential concave step portions 20 and 21 are formed on the inner peripheral portion.
0 is formed on an inclined surface having an angle close to 90 degrees with respect to the axis, and the outer peripheral portion of the outward flange 5 a of the inner ring 5 slidingly contacting the outer ring 7 is lightly slid along the inclined surface 20. Are in contact. A disk-shaped backing member 22 is interposed between the disk-shaped inner ring 5 and the cylindrical portion 6a of the L-shaped inner ring 6 on the outer side of the bearing. The angle of the inclined surface 20 is not limited to the above.
According to this embodiment, since the outer peripheral portion of the disk-shaped inner ring member 5 only needs to be attached to the inclined surface 20, the outer peripheral portion of the inner ring member 5 does not need to be formed, leading to cost reduction. Further, the backing member 22 facilitates adjustment of the sliding contact force of the outer peripheral portion of the inner annular member 5 with the inclined surface 20 of the outer annular member 7.

[0016]

According to the present invention, since the contact sealing portion is formed inside the non-contact sealing device of the bearing, it is possible to prevent water or the like from entering the inside of the bearing when the rolling mill stops operating or rotates at a low speed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is a sectional view of the sealing device of FIG. 1;

FIG. 3 is a sectional view of a sealing device according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a conventional bearing.

FIG. 5 is a sectional view of the sealing device of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bearing 2 Inner ring 3 Outer ring 4,5,6 Inner ring 4a, 5a, 6a Outward flange 7,8 Outer ring 7a, 8a Inward flange 9 Labyrinth 10 Non-contact sealing device 16 Contact sealing part

Claims (3)

[Claims] A plurality of inner rings having an outward flange are axially superposed and arranged at an end of an inner ring, and a plurality of outer rings having an inward flange are arranged at an end of an outer ring in an axial direction. The outer flange and the inner flange are alternately arranged so that the outward flanges are located at both ends in the axial direction, and the labyrinth is formed by the gap between these flanges. In a sealed roller bearing in a rolling mill in which a non-contact sealing device is formed, an outer peripheral portion of an outward flange of an inner annular member located between inward flanges of two adjacent outer annular members is attached to the outer peripheral member of the two outer annular members. A contact sealing portion is formed inside the non-contact sealing device by slidingly contacting the inner peripheral surface of at least one outer ring, and at least one peripheral surface of the inner ring and the outer ring in the sliding contact portion is lubricated. From non-metallic materials A hermetically sealed roller bearing for a rolling mill. 2. An outer peripheral portion of an outward flange of an inner ring which is in sliding contact with the outer ring while an inner peripheral surface between each flange of the two adjacent outer rings is formed as a parallel surface parallel to an axis. 2. A hermetic roller bearing in a rolling mill according to claim 1, wherein the bent portion is formed in a bent portion parallel to the axis, and the bent portion is slidably contacted with a parallel surface of the outer ring body. 3. A peripheral concave step facing the inner peripheral portion of each of the two adjacent outer rings, and a peripheral concave step of one outer ring is formed on an inclined surface. 2. The hermetic roller bearing in a rolling mill according to claim 1, wherein an outer peripheral portion of an outward flange of an inner annular member which is in sliding contact with the outer annular member is brought into sliding contact with the inclined surface.