JP2011149511A - Rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device capable of preventing the damage to a seal member. <P>SOLUTION: A tapered roller bearing 4 is disposed between an outer cylinder 1 and a shaft body 2. A second sealing device 11 is disposed outward in the axial direction of the tapered roller bearing 4 between the outer cylinder 1 and the shaft body 2. The second sealing device 11 includes a seal cover 20 fitted and fixed into the outer cylinder 1, and the seal member 21. The seal cover 20 includes a body part 30 of rectangular cross section, and an extended part 31 extended radially inward from the body part 30. The seal member 21 is disposed on the opposite side to the tapered roller bearing 4 side in the axial direction of the body part 30 of the seal cover 20 with respect to the extended part 31. A large diameter annular part 73 on the extended part 31 side of a cage 65 of the tapered roller bearing 4 overlaps with the extended part 31 in the axial direction of the outer ring 60. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rolling bearing device, and more particularly to a rolling bearing device that is preferably used for a backup roll of a rolling mill.

  Conventionally, as a rolling bearing device, there is one described in Japanese Utility Model Publication No. 1-72902 (Patent Document 1). The rolling bearing device includes a housing, a shaft body, an outer ring, an inner ring, a plurality of tapered rollers, a cage, an annular seal cover, and an annular seal member. The outer ring is fitted on the inner circumferential surface of the housing, while the inner ring is fitted on the outer circumferential surface of the shaft body. The plurality of tapered rollers are disposed between the inner peripheral conical raceway surface of the outer ring and the outer peripheral conical raceway surface of the inner ring in a state of being held by a cage and spaced from each other.

  The seal cover is located on the large diameter side of the inner circumferential conical raceway surface of the outer ring. The seal cover is fitted and fixed to the inner peripheral surface of the housing. The seal cover has an extending portion extending inward in the radial direction, and the extending portion extends inward in the radial direction from an end portion on the outer ring side in the axial direction of the seal cover. ing. The extending portion is located at a radial interval with respect to the cage. The seal member is located on the opposite side of the extending portion from the outer ring side. The seal member is fitted and fixed to the inner peripheral surface of the seal cover.

  The extending portion of the seal cover prevents the seal member from moving to the outer ring side and detaching from the seal cover.

Japanese Utility Model Publication No. 1-72902 (Fig. 2)

  The present inventor has found that the following problems exist in the conventional rolling bearing device. That is, when the rolling bearing device is arranged with its central axis parallel to the vertical direction, the tapered roller assembly consisting of the inner ring, the tapered roller, and the cage is self-weighted during assembly and maintenance. May fall. In such a case, it has been found that the annular member of the retainer of the tapered roller assembly, which is considerably heavier than the sealing member, collides with the sealing member vigorously, so that the sealing member may be damaged.

  Then, the subject of this invention is providing the rolling bearing apparatus which can prevent the failure | damage of a sealing member.

In order to solve the above problems, the rolling bearing device of the present invention is
A housing having an inner peripheral surface;
An outer ring having an outer peripheral surface fitted into the inner peripheral surface and an inner peripheral conical raceway surface;
An inner ring having an outer circumferential conical raceway surface and a flange located on the larger diameter side of the outer circumferential conical raceway surface;
A plurality of tapered rollers disposed between the inner peripheral conical raceway surface of the outer ring and the outer peripheral conical raceway surface of the inner ring;
An annular portion located on the flange side in the axial direction of the tapered roller and a plurality of column portions extending from the annular portion and spaced apart from each other in the circumferential direction, and adjacent to each other in the circumferential direction A cage for accommodating the tapered rollers in a pocket formed between the pillars;
An annular main body having an outer peripheral surface that is located on the large-diameter side of the inner peripheral conical raceway surface of the outer ring and is fitted into the inner peripheral surface of the housing, and a radially inner side from the main body A seal cover having an extending portion extending to
A seal member that is located on the opposite side of the extension part from the cage side in the axial direction of the body part, and is fitted into the inner peripheral surface of the body part,
The annular portion of the cage and the extending portion of the seal cover overlap with each other in the axial direction of the outer ring.

  According to the present invention, the extending portion of the seal cover overlaps with the annular portion of the cage in the axial direction of the outer ring, and the seal member extends in the axial direction of the body portion of the seal cover with respect to the extending portion. Because the tapered roller assembly consisting of the inner ring, the tapered roller and the cage drops in the vertical direction during assembly or maintenance, even if the tapered roller assembly falls in the vertical direction during assembly or maintenance, the cage of the tapered roller assembly However, it will collide with the extension part and will not collide with the seal member. Further, even after the collision with the extending portion of the tapered roller assembly, the weight of the tapered roller assembly can be supported by the extending portion, and the weight of the tapered roller assembly is not applied to the seal member. Therefore, damage to the seal member can be prevented, and the life of the seal member can be extended.

  In one embodiment, the entire end face of the annular part on the extension part side in the axial direction of the outer ring overlaps the extension part in the axial direction.

  According to the said embodiment, the impact force of the extension part by the collision with the said holder | retainer can be absorbed in the wider part of an extension part. Therefore, it is possible to suppress the deformation of the extending portion due to the collision with the annular portion, and thereby it is possible to more reliably prevent the seal member from being damaged.

  According to the rolling bearing device of the present invention, the extending portion of the seal cover overlaps the annular portion of the cage in the axial direction of the outer ring, and the seal member is the shaft of the main body portion of the seal cover with respect to the extending portion. Since the tapered roller assembly consisting of the inner ring, the tapered roller and the cage is dropped by its own weight in the vertical direction during assembly and maintenance, the tapered roller The assembly retainer does not collide with the extending portion and does not collide with the seal member. Therefore, damage to the seal member can be prevented.

It is a schematic cross section of the axial direction of the rolling bearing apparatus of one Embodiment of this invention. It is an expanded sectional view of the seal member periphery in FIG.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view in the axial direction of a rolling bearing device according to an embodiment of the present invention.

  This rolling bearing device is a backup roll of a rolling mill. This rolling bearing device is arranged around a rolling roll (not shown) with its central axis substantially parallel to the vertical direction.

  The rolling bearing device includes an outer cylinder 1 as an example of a housing, a shaft body 2, a first tapered roller bearing 3, a second tapered roller bearing 4, a plurality of first cylindrical rollers 15, and a plurality of second cylinders. Cylindrical roller 16, a plurality of third cylindrical rollers 17, a plurality of fourth cylindrical rollers 18, an annular outer ring spacer 6, an annular first spacer 7, an annular second spacer 8, and a first seal The first cylindrical roller 15, the second cylindrical roller 16, the third cylindrical roller 17, and the fourth cylindrical roller 18 are provided with a device 10 and a second sealing device 11. Arranged in columns.

  The first tapered roller bearing 3 is disposed on one end side in the axial direction between the outer cylinder 1 and the shaft body 2, while the second tapered roller bearing 4 is disposed between the outer cylinder 1 and the shaft body 2. Is disposed on the other end side in the axial direction. The first tapered roller bearing 3 is located above the second tapered roller bearing 4 in the vertical direction.

  The shaft body 2 has a step portion 9 on the outer side in the axial direction than the first tapered roller bearing 3. The first spacer 7 is fitted on the outer peripheral surface of the shaft body 2. The first spacer 7 is disposed between the first tapered roller bearing 3 and the step 9 of the shaft body 2. The first sealing device 10 seals between the inner peripheral surface of the outer cylinder 1 and the outer peripheral surface of the first spacer 7.

  The shaft body 2 has an annular groove outward in the axial direction from the second tapered roller bearing 4, and a retaining ring 19 is fitted into the annular groove and fixed. The second spacer 8 is fitted on the outer peripheral surface of the shaft body 2. The second spacer 8 is disposed between the second tapered roller bearing 4 and the retaining ring 19. The second sealing device 11 seals between the inner peripheral surface of the outer cylinder 1 and the outer peripheral surface of the second spacer 8.

  Among the first cylindrical roller 15, the second cylindrical roller 16, the third cylindrical roller 17, and the fourth cylindrical roller 18, the first cylindrical roller 15 is located closest to the first tapered roller bearing 3 side, Among the first cylindrical roller 15, the second cylindrical roller 16, the third cylindrical roller 17, and the fourth cylindrical roller 18, the four cylindrical roller 18 is positioned closest to the second tapered roller bearing 4 side. The plurality of first cylindrical rollers 15 and the plurality of second cylindrical rollers 16 are held by the first comb cage 12, while the plurality of third cylindrical rollers 17 and the plurality of fourth cylindrical rollers 18. Is held by the second comb cage 13. Each of the first and second comb-shaped cages 12 and 13 has a structure in which pillar portions protrude in a comb shape from both sides of one annular portion. Further, the second cylindrical roller 16 and the third cylindrical roller 17 are connected via the outer ring spacer 6. The first cylindrical roller 15 is in contact with the axial end surface of the outer ring of the first tapered roller bearing 3, and the fourth cylindrical roller 18 is in contact with the axial end surface of the outer ring of the second tapered roller bearing 4. ing.

  The rolling bearing device includes a step 9 of the shaft body 2, a first spacer 7, an inner ring of the first tapered roller bearing 3, a tapered roller of the first tapered roller bearing 3, an outer ring of the first tapered roller bearing 3, and a first cylinder. Roller 15, first comb-shaped cage 12, second cylindrical roller 16, outer ring spacer 6, third cylindrical roller 17, second comb-shaped cage 13, fourth cylindrical roller 18, and outer ring of second tapered roller bearing 4 Each member is axially positioned by applying an axial load in the order of the tapered roller of the second tapered roller bearing 4, the inner ring of the second tapered roller bearing 4, the second spacer 8, and the retaining ring 19.

  FIG. 2 is an enlarged cross-sectional view of the periphery of the second sealing device 11 in FIG.

  As shown in FIG. 2, the second tapered roller bearing 4 includes an outer ring 60, an inner ring 61, a plurality of tapered rollers 62, and a cage 65. The outer ring 60 is fitted on the cylindrical inner peripheral surface of the outer cylinder 1, while the inner ring 61 is fitted on the cylindrical outer peripheral surface of the shaft body 2. The outer ring 60 has an inner circumferential conical raceway surface 70, while the inner ring 61 has an outer circumferential conical raceway surface 71 and a large collar portion 72, and the large collar portion 72 is on the larger diameter side of the outer circumferential cone raceway surface 71. Is located. Further, the plurality of tapered rollers 62 are disposed at intervals between the inner peripheral conical raceway surface 70 of the outer ring 60 and the outer peripheral conical raceway surface 71 of the inner ring 61 while being held by the cage 65. Has been.

  The cage 65 has a large-diameter annular portion 73, a small-diameter annular portion (not shown), and a plurality of pillar portions (not shown). The inner diameter of the large-diameter annular portion 73 is that of the small-diameter annular portion. It is larger than the outer diameter. Each of the column portions connects the large-diameter annular portion 73 and the small-diameter annular portion. The plurality of column portions are arranged at intervals in the circumferential direction of the large-diameter annular portion 73. The large-diameter annular portion 73 is located on the large collar portion 72 side in the axial direction of the tapered roller 62. The cage 65 has a pocket 75 between the column portions adjacent in the circumferential direction, and the tapered roller 62 is accommodated in the pocket 75.

  The second seal device 11 includes an annular seal cover 20 and an annular seal member 21. The outer cylinder 1 has a step portion 23 and an annular groove 24 on the other axial side on the inner peripheral side, and a retaining ring 25 is fitted into the annular groove 24. The seal cover 20 is disposed between the step portion 23 and the retaining ring 25.

  The seal cover 20 includes an annular main body 30 having a substantially rectangular cross section and an annular extending portion 31, and the main body 30 includes a cylindrical outer peripheral surface 27 and a cylindrical inner peripheral surface 28. The cylindrical outer peripheral surface 27 of the main body 30 is fitted and fixed to the inner peripheral surface of the outer cylinder 1 by clearance fitting. The extending portion 31 has a substantially rectangular shape in cross section. The extending portion 31 extends radially inward from the end portion of the main body portion 30 on the second tapered roller bearing 4 side in the axial direction.

  The seal member 21 is located on the opposite side of the extending portion 31 of the seal cover 20 from the cage 65 side in the axial direction of the main body 30 of the seal cover 20. The seal member 21 includes a first cored bar part 40, a second cored bar part 41, a first elastic part 42, a second elastic part 43, and a slinger 44. The first cored bar 40 has a substantially L-shaped cross section, and includes a cylindrical part and an annular radial extending part. The first cored bar 40 is in contact with the cylindrical inner peripheral surface 28 of the main body 30 and the end surface of the extending portion 31 opposite to the second tapered roller bearing 4 in the axial direction. The inner circumferential surface 28 is disposed on the radially inner side. The cylindrical part of the first cored bar part 40 is fitted and fixed to the cylindrical inner peripheral surface 28 of the seal cover 20 by an interference fit. Further, the radially extending portion of the first cored bar portion 40 is in contact with the end surface of the extending portion 31 of the seal cover 20 on the side opposite to the second tapered roller bearing 4 side in the axial direction.

  The second cored bar portion 41 has a substantially L-shaped cross section, and has a cylindrical portion and an annular radially extending portion. The outer peripheral surface of the cylindrical part of the second cored bar part 41 is fitted and fixed to the inner peripheral surface of the cylindrical part of the first cored bar part 41 by press fitting. The radially extending portion of the second cored bar portion 41 is radially inward from the end opposite to the second tapered roller bearing 4 side in the axial direction of the cylindrical portion of the second cored bar portion 41. Extends to the side. The radially extending portion of the first cored bar portion 40 and the radially extending portion of the second cored bar portion 41 are opposed to each other in the axial direction with a space therebetween.

  The slinger 44 has a cylindrical portion 50 and an annular flange portion 51, and the cylindrical portion 50 is externally fitted and fixed to the outer peripheral surface of the second spacer 8 by an interference fit. The flange portion 51 extends radially outward from the end of the cylindrical portion 50 opposite to the second tapered roller bearing 4 side in the axial direction. The flange portion 51 is positioned outward in the axial direction of the retaining ring 25 that is locked to the outer cylinder 1. The second spacer 8 is fitted and fixed to the outer peripheral surface of the shaft body 2 by clearance fitting.

  The first elastic part 42 is fixed to the radially inward end of the radial extension part of the first cored bar part 40, while the second elastic part 43 is fixed to the second cored bar part 41. It is fixed to the radially inner end of the radially extending portion. The first elastic portion 42 has a radial lip, and the radial lip is in sliding contact with the outer peripheral surface of the cylindrical portion 50 of the slinger 44. The second elastic portion 43 has an axial lip, and the axial lip is in sliding contact with the end surface of the flange portion 51 of the slinger 44 on the second tapered roller bearing 4 side in the axial direction.

  As shown in FIG. 2, the large-diameter annular portion 73 of the cage 65 overlaps the extending portion 31 of the seal cover 20 in the axial direction of the outer ring 60. In FIG. 2, reference numerals 80 and 82 denote O-rings. The O-ring 80 seals between the outer peripheral surface of the seal cover 20 and the inner peripheral surface of the outer cylinder 1, and the O-ring 82 includes an inner peripheral surface of the second spacer 8 and an outer peripheral surface of the shaft body 2. The space between them is sealed. Reference numeral 88 indicates an annular member. The annular member 88 is located outward of the retaining ring 19 in the axial direction. The annular member 88 is fixed by being fitted on the outer peripheral surface of the shaft body 2 by a clearance fit.

  In the above configuration, the rolling bearing device is configured such that the outer cylinder 1 rotates with respect to the shaft body 2 when the outer cylinder 1 contacts the outer cylinder of the rolling roll or the outer cylinder of another backup roll. ing. In this way, the rolling roll or other backup roll is backed up.

  According to the rolling bearing device of the above embodiment, the extending portion 31 of the seal cover 20 overlaps the large-diameter annular portion 73 of the retainer 65 in the axial direction of the outer ring 60, and the seal member 21 is The extension portion 31 is located on the opposite side of the axial direction of the main body portion 30 of the seal cover 20 from the cage 65 side. Therefore, when the second spacer 8, the retaining ring 19, and the annular member 88 are removed during assembly or maintenance, the tapered roller assembly including the inner ring 61, the tapered roller 62, and the retainer 65 has its own weight and is in the vertical direction. Even if it falls, the retainer 65 of the tapered roller assembly collides with the extending portion 31, and the tapered roller assembly does not collide with the seal member 21. In addition, even after the collision with the extending portion 31 of the tapered roller assembly, the own weight of the tapered roller assembly can be supported by the extending portion 31, and the own weight of the tapered roller assembly is not applied to the seal member 21. . Therefore, damage to the seal member 21 can be prevented, and the life of the seal member 21 can be extended.

  Note that the entire end face on the seal member 21 side in the axial direction of the large-diameter annular portion 73 of the retainer 65 may overlap the extending portion 31 in the axial direction of the outer ring 60. Only a part of the end surface on the seal member 21 side in the axial direction of the portion 73 may overlap the extending portion 31 in the axial direction of the outer ring 60.

  In the above embodiment, the large-diameter annular portion 73 of the cage 65 of the second tapered roller bearing 4 overlaps the extending portion 31 of the seal cover 20 in the axial direction on the other end side in the axial direction of the rolling bearing device. It was. Here, also on the one end side in the axial direction of the rolling bearing device, the large-diameter annular portion of the cage of the first tapered roller bearing 3 extends the seal cover in the same manner as the other end side in the axial direction of the rolling bearing device. A structure may be employed in which the cage overlaps the portion in the axial direction so that the cage does not contact the seal member. This is preferable because either axial end may be arranged vertically upward, and the degree of freedom of arrangement of the rolling bearing device can be increased. It should be noted that the large-diameter annular portion of the retainer of the first tapered roller bearing 3 may be disposed at a radial interval in the extending portion of the seal cover on one end side in the axial direction of the rolling bearing device. Needless to say.

  In the rolling bearing device of the above embodiment, the cylindrical rollers 15, 16, 17, and 18 are arranged in four rows in the axial direction. In the present invention, the cylindrical rollers are arranged in two rows and three in the axial direction. You may arrange | position over a row or 5 rows or more.

  In the rolling bearing device of the above embodiment, the elastic portions 42 and 43 of the seal member 21 are members indirectly fixed to the shaft body 2 (in this embodiment, the second spacer directly fixed to the shaft body 2). In this invention, the elastic portion of the seal member is a member of the member directly fixed to the shaft body. The structure which slidably contacts with an outer peripheral surface or the outer peripheral surface of a shaft body may be sufficient.

  The rolling bearing device of the above embodiment is a backup roll. However, the rolling bearing device of the present invention may be a rolling bearing device other than the backup roll, such as a rolling roll, and is used for a rolling mill. A rolling bearing device other than the bearing device may be used.

DESCRIPTION OF SYMBOLS 1 Outer cylinder 2 Shaft body 4 2nd tapered roller bearing 20 Seal cover 21 Seal member 30 Main part of seal cover 31 Extension part of seal cover 60 Outer ring 61 Inner ring 62 Conical roller 65 Cage 70 Inner circumferential conical track surface 71 Outer cone Raceway 72 Large collar 73 Large diameter ring 75 Pocket

Claims (1)

A housing having an inner peripheral surface;
An outer ring having an outer peripheral surface fitted into the inner peripheral surface and an inner peripheral conical raceway surface;
An inner ring having an outer circumferential conical raceway surface and a flange located on the larger diameter side of the outer circumferential conical raceway surface;
A plurality of tapered rollers disposed between the inner peripheral conical raceway surface of the outer ring and the outer peripheral conical raceway surface of the inner ring;
An annular portion located on the flange side in the axial direction of the tapered roller and a plurality of column portions extending from the annular portion and spaced apart from each other in the circumferential direction, and adjacent to each other in the circumferential direction A cage for accommodating the tapered rollers in a pocket formed between the pillars;
An annular main body having an outer peripheral surface that is located on the large-diameter side of the inner peripheral conical raceway surface of the outer ring and is fitted into the inner peripheral surface of the housing, and a radially inner side from the main body A seal cover having an extending portion extending to
A seal member that is located on the opposite side of the extension part from the cage side in the axial direction of the body part, and is fitted into the inner peripheral surface of the body part,
The rolling bearing device according to claim 1, wherein the annular portion of the cage and the extending portion of the seal cover overlap with each other in the axial direction of the outer ring.

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