JP2010144768A - Rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing preventing deformation of a raceway ring while surely preventing co-rotation and eliminating deviation of dimension of the raceway ring after assembly of the bearing. <P>SOLUTION: This rolling bearing device includes an inner ring 3, an outer ring 2, rolling elements 4, a first sealing member 10 fixed on one of circumference surfaces of an outer circumference surface of the inner ring 3 and an inner circumference surface of the outer ring 2, and a second sealing member 11 fixed on another circumference surface of the outer circumference surface of the inner ring 3 and the inner circumference surface of the outer ring 2 and constructing a seal part together with the first sealing member 10. The first sealing member 10 includes a cylindrical part 10a fixed on one of the circumference surfaces by transition fitting or loose fitting, and an annular plate part 10b extending in a radial direction toward the circumference surface of another circumference surface from an axial direction one end of the cylindrical part 10a. A projection part 20 projecting in an axial direction is formed at an axial direction another end projecting in the axial direction another end of the cylindrical part 10a. A hollow part 21 in which the projection part 20 can be fitted is formed on one circumference surface on which the cylindrical part 10a of the first sealing member 10 is fixed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rolling bearing device. More specifically, the present invention relates to a rolling bearing device used to support a heavy load roll such as a work roll or a backup roll of a rolling mill.

  In a rolling bearing device used to support a backup roll of a rolling mill, oil mist is usually supplied to the rolling elements as a lubricant, but the oil mist supplied inside the bearing is released to the outside. In order to prevent foreign substances such as water and dust from entering the inside of the bearing from the outside, sealing devices having a sealing function are disposed at both axial ends of the bearing device.

  The sealing device includes an annular core metal fixed to one of the inner ring and the outer ring, and an axial lip formed so as to extend in the axial direction by vulcanizing and bonding rubber to the annular core metal. The axial lip is brought into sliding contact with a slinger or a seal plate which is a mating member fixed to the other of the inner ring and the outer ring, thereby realizing the sealing function described above (see, for example, Patent Document 1).

JP 2002-228007 A

  The seal plate is attached to the inner ring or the outer ring with a tight fit (tight), and the tightening amount of the fitting is set so that the seal plate does not rotate due to sliding contact with the axial lip. . This conventional tightening allowance is relatively large, so in most cases the press-fit seal plate itself deforms, but the inner ring or outer ring, which is a race, may also be deformed. In this case, the seal plate is attached. The raceway after this will be out of size. For example, when a seal plate is attached to the inner ring with a tight fit (tight), the inner ring inner diameter shrinks more and the inner ring inner diameter deviates from the standard.

  On the other hand, it is conceivable to control the tightening allowance amount of the fitting, but from the viewpoint of the processing accuracy of the seal plate and the bearing ring, by controlling the tightening allowance amount, the bearing ring can be reliably prevented from being rotated. It is difficult to prevent deformation.

  The present invention has been made in view of such circumstances, and it is possible to prevent the race ring from being deformed while reliably preventing rotation, and to prevent the race ring from being out of dimension after the bearing is assembled. The object is to provide a bearing device.

The rolling bearing device of the present invention includes an inner ring having an inner ring raceway surface on an outer peripheral surface,
An outer ring having an outer ring raceway surface on the inner circumferential surface;
A rolling element disposed between the inner ring raceway surface and the outer ring raceway surface;
A first sealing member fixed to one of the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring;
A rolling bearing device comprising a second sealing member that is fixed to the other peripheral surface of the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring and that forms a seal portion with the first sealing member,
The first sealing member includes a cylindrical portion fixed to the one peripheral surface by an intermediate fit or a gap fit, and an annular plate portion extending radially from one axial end of the cylindrical portion toward the other peripheral surface. Have
A protruding portion protruding in the axial direction is formed at the other axial end of the cylindrical portion, and
The one peripheral surface to which the cylindrical portion of the first sealing member is fixed is formed with a recess into which the protruding portion can be fitted.

  In the rolling bearing device of the present invention, the protruding portion is formed on the cylindrical portion of the first sealing member that is fixed to one of the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring, and the first sealing member A concave portion into which the protruding portion can be fitted is formed on the one peripheral surface to which the cylindrical portion is fixed. Further, since the rotation of the first sealing member is prevented by the engagement between the protruding portion and the wall surface of the concave portion, the intermediate fitting or the gap fitting is sufficient for fixing the first sealing member to the one peripheral surface. As a result, the inner ring or the outer ring to which the first sealing member is fixed is not deformed, and the dimension of the inner ring or the outer ring after the assembly of the bearing can be eliminated.

  The protruding portion can be formed by caulking a predetermined portion at the other axial end of the cylindrical portion. In this case, since the protrusion is easily formed by caulking, the formation process of the protrusion can be simplified, and the manufacturing cost can be reduced.

A second protrusion that protrudes toward the one peripheral surface is formed on the surface on the one peripheral surface of the protrusion,
The protrusion has a first end face on the other end side in the axial direction, and the second protrusion has a second end face on the one end side in the axial direction,
The concave portion has a third end surface facing the first end surface and a fourth end surface facing the second end surface,
The axial movement of the first sealing member can be restricted by the contact between the first end surface and the third end surface, and the contact between the second end surface and the fourth end surface. According to this configuration, the movement of the first sealing member in the axial direction is restricted by the contact between the projecting portion, the second projecting portion, and the end surfaces of the recess, and the first sealing member is It is possible to reliably prevent the inner ring or the outer ring from being fixed.

  A plurality of the recesses can be formed along the circumferential direction of the one peripheral surface. By providing a plurality of protrusions and recesses, it is possible to reliably prevent the first sealing member from being rotated. Further, when the concave portions are arranged at equal intervals along the circumferential direction, the reaction force from the concave portions when preventing the accompanying rotation can be uniformly transmitted to the first sealing member, and deformation of the first sealing member can be performed. Can be suppressed.

  According to the rolling bearing device of the present invention, it is possible to prevent the bearing ring from being deformed while reliably preventing the rotation of the bearing ring, and it is possible to eliminate the off-size of the bearing ring after the bearing is assembled.

Hereinafter, embodiments of the rolling bearing device of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a cross-sectional explanatory view of an upper half portion of a backup roll 1 of a rolling mill to which a rolling bearing device according to an embodiment of the present invention is applied. The backup roll 1 includes a roll body (outer ring) 2 having an outer ring raceway surface 2a on an inner peripheral surface, an inner ring 3 as a support body having an inner ring raceway surface 3a on an outer peripheral surface and supporting the roll body 2, A plurality of rollers 4 which are rolling elements arranged in two rows in the axial direction in the annular space between the roll body 2 and the inner ring 3, and seal portions 5 arranged in the vicinity of both axial ends of the annular space; It is mainly composed of. In FIG. 1, 6 is a support shaft, and 7 is an eccentric bush provided between the support shaft and the inner ring 3.

  The eccentric bush 7 and the inner ring 3 are formed with oil passages 8 for supplying oil mist for lubrication to the rollers 4 from the support shaft 6 side in the radially outward direction. The oil passage 8 is formed at four locations at equal intervals along the circumferential direction. In each oil passage 8 in the eccentric bush 7, a nozzle 9 for spraying oil to the roller 4 side is disposed.

  As shown in FIG. 2, the seal portion 5 includes a seal plate 10 that is a first sealing member that is fixed to the outer peripheral surface of the inner ring 3, and a second that is fixed to the inner peripheral surface of the roll body 2 that is an outer ring. It is comprised with the dust seal 11 which is a sealing member.

  The seal plate 10 has an L-shaped axial cross section, and is fixed to the outer peripheral surface of the inner ring 3 by intermediate fitting or gap fitting, and one axial end of the cylindrical portion 10a (on the right side in FIG. 2). And an annular plate portion 10b extending in the radial direction from the end) toward the inner peripheral surface of the roll body 2.

  On the other hand, the dust seal 11 includes an annular core 12 fixed to the inner peripheral surface of the roll body 2 and a seal body 13 formed by vulcanizing and bonding a rubber-like elastic body to the annular core 12. The seal body 13 is integrally formed with an axial lip 14 as an elastic lip. The axial lip 14 extends from the inner peripheral side edge of the annular core metal 12 in the axially outward direction and the radially outward direction in a state where the dust seal 11 is mounted at a predetermined position. The dust seal 11 is fixed to the roll body 2 by being pressed inward in the axial direction by a snap ring 15 attached to a groove 2 b formed on the inner peripheral surface of the roll body 2.

  At the other end in the axial direction of the cylindrical portion 10a of the seal plate 10 (the left end in FIG. 2), four protrusions 20 protruding inward in the axial direction are formed at equal intervals along the circumferential direction. Further, a concave portion 21 into which the protruding portion 20 can be fitted is formed on the outer peripheral surface of the inner ring 3 to which the cylindrical portion 10a of the seal plate 10 is fixed. In the present embodiment, the protruding portion 20 has a rectangular shape, and the concave portion 21 has a rectangular shape corresponding thereto. The protrusion 20 can be formed, for example, by turning while leaving the protrusion, and the recess 21 can be formed, for example, by turning into the shape of a recess.

  Even if a circumferential force is applied to the seal plate 10 by sliding contact with the axial lip 14, the seal plate 10 is rotated by the engagement between the protrusion 20 and the circumferential wall 21 b of the recess 21. Can be reliably prevented. Therefore, it is not necessary to fix the seal plate 10 to the outer peripheral surface of the inner ring 3 as in the conventional interference fit, and an intermediate fit or a gap fit is sufficient. As a result, the inner ring 3 to which the seal plate 10 is fixed is not deformed, and the dimension of the inner ring 3 after the assembly of the bearing can be eliminated.

  Further, by forming the plurality of protrusions 20 and the plurality of recesses 21 corresponding thereto as in the present embodiment, it is possible to more reliably prevent the seal plate 10 from being rotated. Further, by disposing the plurality of recesses 21 at equal intervals along the circumferential direction, the reaction force from the recesses 21 when the accompanying rotation is prevented can be transmitted to the seal plate 10 evenly. The deformation of the plate 10 can be suppressed.

  On the back surface or the inner surface of the cylindrical portion 10a (the surface facing the outer peripheral surface of the inner ring 3), an annular ridge 22 is formed that protrudes radially inward along the side edge on the other end side of the cylindrical portion 10a. Yes. The annular ridge 22 is fitted into an annular groove 23 formed on the outer peripheral surface of the inner ring 3. The concave portion 21 communicates with the annular groove 23, and each bottom surface is set to have the same level. Therefore, in the location where the recessed part 21 exists, the said recessed part 21 and the annular groove part following this can also be considered as a recessed part.

  The protrusion 20 has a first end surface 20a on the other end side in the axial direction, and the annular ridge 22 has a second end surface 22a on one end side in the axial direction. On the other hand, the recess 21 has a third end face 21a facing the first end face 20a on the inner side in the axial direction, and an annular groove 23 portion communicating with the recess 21 (as described above, the annular groove 23 portion). Also has a fourth end face 23a facing the second end face 22a on the outside in the axial direction. The axial movement of the seal plate 10 is restricted by the contact between the first end surface 20a and the third end surface 21a and the contact between the second end surface 22a and the fourth end surface 23a. Thereby, it is possible to reliably prevent the seal plate 10 from coming off the inner ring 3.

  In addition, the said protrusion part 20 can be formed by crimping the predetermined location of the axial direction other end of the said cylindrical part 10a, as FIG. 3 shows. In this case, since the protrusion 20 is easily formed by caulking, the process of forming the protrusion 20 can be simplified, and the manufacturing cost can be reduced.

Moreover, in embodiment shown by FIGS. 1-2, although the shape of the recessed part 21 is made into the rectangular shape, this invention is not limited to this, For example, it is set as other shapes, such as trapezoid shape and circular arc shape. You can also.
In the embodiment described above, the annular ridge 22 and the annular groove 23 are formed to prevent the seal plate 10 from coming off. However, these are omitted, and the rear surface or the inner surface (the inner ring 3 of the inner ring 3) is omitted. A second projecting portion projecting in the radially inward direction is formed on the surface facing the outer peripheral surface, and the seal is obtained by engaging the end surface on the outer side in the axial direction of the second projecting portion with the end surface on the outer side in the axial direction of the recess 21. It is also possible to prevent the plate 10 from coming off.
In the above-described embodiment, the seal plate 10 is fixed to the inner ring 3, but it can also be fixed to the roll body 2 side that is an outer ring.

It is sectional explanatory drawing of the upper half part of the backup roll of the rolling mill with which one Embodiment of the rolling bearing apparatus of this invention was applied. It is explanatory drawing of the seal part in the rolling bearing apparatus shown by FIG. 1, (a) is plane explanatory drawing, (b) is sectional explanatory drawing. It is explanatory drawing of the other example of the seal part in a rolling bearing apparatus, (a) is plane explanatory drawing, (b) is sectional explanatory drawing.

Explanation of symbols

1 Backup roll 2 Roll body (outer ring)
3 Inner ring 4 Roller (rolling element)
5 Seal portion 6 Support shaft 10 Seal plate (first sealing member)
10a Cylindrical part 10b Annular plate part 11 Dust seal (second sealing member)
12 annular cored bar 13 seal body 14 axial lip 20 projecting part 20a first end face 21 recessed part 21a third end face 22 annular ridge 22a second end face 23 annular groove 23a fourth end face

Claims (4)

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 rolling element disposed between the inner ring raceway surface and the outer ring raceway surface;
A first sealing member fixed to one of the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring;
A rolling bearing device comprising a second sealing member that is fixed to the other peripheral surface of the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring and that forms a seal portion with the first sealing member,
The first sealing member includes a cylindrical portion fixed to the one peripheral surface by an intermediate fit or a gap fit, and an annular plate portion extending radially from one axial end of the cylindrical portion toward the other peripheral surface. Have
A protruding portion protruding in the axial direction is formed at the other axial end of the cylindrical portion, and
A rolling bearing device in which a concave portion into which the protruding portion can be fitted is formed on the one peripheral surface to which the cylindrical portion of the first sealing member is fixed.   The rolling bearing device according to claim 1, wherein the protruding portion is formed by caulking a predetermined portion at the other axial end of the cylindrical portion. On the surface on the one circumferential surface side of the cylindrical portion, a second projecting portion projecting on the one circumferential surface side is formed,
The protrusion has a first end face on the other end side in the axial direction, and the second protrusion has a second end face on the one end side in the axial direction,
The concave portion has a third end surface facing the first end surface and a fourth end surface facing the second end surface,
3. The axial movement of the first sealing member is restricted by the contact between the first end surface and the third end surface and the contact between the second end surface and the fourth end surface. Rolling bearing device.   The rolling bearing device according to claim 1, wherein a plurality of the recesses are formed along a circumferential direction of the one peripheral surface.

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