JP5434349B2 - Bearing device - Google Patents

Description

  The present invention relates to a bearing device, and more particularly to a bearing device used for rotating an outer ring, such as a tension leveler, a backup roll, and a sendima of a rolling mill for steel.

  A backup roll used for a leveler of a rolling mill for steel, for example, supports a cylindrical roll rotatably by means of rolling bearings disposed at both ends of the roll shaft, and the roll shaft and the roll on the outer side in the axial direction of the rolling bearing. A seal device is interposed between the rolls to seal the inside of the roll.

  Conventionally, as a seal device for a bearing device that is used in a harsh environment where there are many foreign matters such as water and dust, such as steel material manufacturing equipment, conventionally, an elastic seal disposed on the outside of the bearing in the axial direction is used. An air nozzle that discharges compressed air, and when the rotation is stopped, the lip portion of the elastic seal contacts and seals with the mating member, and when rotating, the compressed air is discharged from the air nozzle to deflect the lip portion of the elastic seal. There is disclosed a seal device that creates a labyrinth gap with a member to reduce rotational torque and prevents foreign matter from entering by discharged air, and a roll structure using the seal device (for example, Patent Document 1). 2).

JP-A-9-151948 JP-A-11-218142

  Foreign matters such as water, dust, and scales enter the bearings used in backup rolls of steel rolling equipment used under severe conditions such as high temperatures and high loads. A foreign matter intrusion preventing function for preventing this and a lubricant holding function for preventing the lubricant inside the bearing from leaking to the outside are required at the same time.

  The sealing device disclosed in Patent Literature 1 and Patent Literature 2 includes one elastic seal and an air nozzle. According to this sealing device, the compressed air discharged from the air nozzle prevents foreign matter from entering the outside of the bearing, but no measures are taken against leakage of the lubricant from the inside of the bearing, improving durability. There was room for improvement.

  The present invention has been made in view of the above-described circumstances, and its purpose is to prevent foreign matter from entering from the outside and prevent lubricant from leaking from the inside at the same time, such as a backup roll bearing of a rolling mill for steel. It is an object of the present invention to provide a bearing device that is excellent in durability and has a long life even when used in such a severe environment.

The above object of the present invention can be achieved by the following constitution.
(1) A bearing device comprising: a roll shaft; a rolling bearing that is externally fitted to the roll shaft; and a roll that is externally fitted to the rolling bearing and is supported so as to be relatively rotatable with respect to the roll shaft. A seal device that has a plurality of seal portions arranged in parallel and is arranged on the outer side in the axial direction of the rolling bearing and seals between the roll shaft and the roll; An inner ring member provided with a nozzle hole that is formed in a cylindrical shape with an O-ring disposed on the inner peripheral surface and a nozzle hole penetrating in a radial direction at a substantially central portion in the axial direction. An outer ring member that is formed in a cylindrical shape and has an O-ring disposed on the outer peripheral surface, and an inner ring member and an outer ring member that are disposed between one end side in the axial direction and the outer ring member with respect to the nozzle hole of the inner ring member, The first seal portion that seals between the nozzle hole of the inner ring member A second seal portion disposed between the other end side in the direction and the outer ring member and sealing between the inner ring member and the outer ring member, the inner ring member, the outer ring member, the first seal portion, and the second seal The part is integrally assembled as a unit device.
(2) The seal device includes a first seal portion disposed on the rolling bearing side and a second seal portion disposed on the outer side in the axial direction from the first seal portion, and the first seal portion is on the roll shaft side. An oil seal fixed to one of the roll member and the roll side member and having an elastic lip portion is in sliding contact with the other peripheral surface of the roll shaft side member and the roll side member, and the second seal portion is a roll shaft An oil seal that is fixed to one of the roll side member and the roll side member, and has an elastic lip portion that is in sliding contact with the other peripheral surface of the roll axis side member and the roll side member, the roll axis side member, and the roll side member A V-ring that is fixed to one of the members and has an elastic lip portion that is in sliding contact with the roll shaft side member and the other side surface of the roll side member, and the roll shaft side member and the roll side member have a slight labyrinth gap. Are placed opposite each other The bearing device according to, characterized in that either of the labyrinth seal (1).
(3) The first seal portion is an oil seal, the second seal portion is an oil seal or a V-ring, and the pressing force against the mating member of the lip portion of the first seal portion is the counterpart of the lip portion of the second seal portion. (2) The bearing device according to (2), wherein the bearing device is set to be larger than the tension force on the member.
( 4 ) Any one of (1) to ( 3 ), wherein the roll has a tapered surface that gradually becomes smaller in diameter toward the outer side in the axial direction on at least an outer peripheral surface in a range where the sealing device is disposed. A bearing device according to claim 1.

According to the bearing device of the present invention, the seal device having a plurality of seal portions arranged in parallel in the axial direction is arranged on the outer side in the axial direction of the rolling bearing and supplies a compressed fluid between the plurality of seal portions. Since the nozzle hole is provided, compressed air, etc. is supplied between the nozzle holes from the nozzle hole to prevent foreign matter from entering from the outside of the bearing device, and at the same time, leakage of lubricant from the inside of the bearing device is prevented. can do. Thereby, durability of a bearing apparatus can be improved and it can be made long life. Moreover, since the inner ring member, the outer ring member, the first seal portion, and the second seal portion are integrally assembled into a unit as the seal device, the seal device can be easily assembled to the bearing device. Moreover, even if a malfunction such as a sealing failure occurs in the sealing device, only the sealing device can be easily replaced, so that the function can be restored in a short time and the downtime of the mechanical device can be greatly shortened. .

  Further, according to the bearing device of the present invention, the seal device is configured by any one of the first seal portion that is configured by the oil seal and is disposed on the rolling bearing side, and the oil seal, the V ring, and the labyrinth seal. Since the second seal portion is arranged on the outer side in the axial direction from the first seal portion, both of them are combined with a simple mechanism seal portion to prevent foreign matter from entering from the outside of the bearing device and from the inside of the bearing device. A seal device that can prevent the leakage of the lubricant can be manufactured at low cost. In addition, during rotation, compressed air is supplied from the nozzle hole to bend the lip and form a gap with the mating member, thereby eliminating contact resistance and reducing friction torque, thereby suppressing energy consumption. Can do.

  Further, according to the bearing device of the present invention, the urging force of the lip portion of the first seal portion arranged on the rolling bearing side with respect to the mating member of the second seal portion arranged on the outer side in the axial direction from the first seal portion. Since it is set to be larger than the urging force of the lip portion against the mating member, a large amount of compressed air is ejected from the gap between the lip portion of the second seal portion and the mating member to prevent foreign matter from entering from the outside. The contact between the lip portion of the seal portion and the mating member can be maintained to prevent leakage of the lubricant from the inside, and foreign matter intrusion and lubricant leakage can be prevented at the same time.

  Furthermore, according to the bearing device of the present invention, since the roll is formed with a tapered surface that gradually becomes smaller in diameter toward the outer side in the axial direction on at least the outer peripheral surface in the range where the seal device is disposed, a large load is applied to the roll. Even if it is elastically deformed by acting, the influence on the sealing device can be suppressed and good sealing performance can always be maintained.

It is sectional drawing for demonstrating 1st Embodiment of the bearing apparatus which concerns on this invention. It is an expanded sectional view of the sealing device shown in FIG. It is an expanded sectional view for explaining the 1st modification of the sealing device of a 1st embodiment. It is an expanded sectional view for explaining the 2nd modification of the sealing device of a 1st embodiment. It is an expanded sectional view for explaining the 3rd modification of the sealing device of a 1st embodiment. It is an expanded sectional view for explaining the 4th modification of a sealing device of a 1st embodiment. It is an expanded sectional view for explaining the 5th modification of a sealing device of a 1st embodiment. It is an expanded sectional view for explaining a 2nd embodiment of a bearing device concerning the present invention. It is an expanded sectional view for explaining the 1st modification of the sealing device of a 2nd embodiment. It is an expanded sectional view for explaining the 2nd modification of the sealing device of a 2nd embodiment. It is an expanded sectional view for explaining a 3rd embodiment of the bearing device concerning the present invention. It is an expanded sectional view for explaining the 1st modification of the sealing device of a 3rd embodiment. It is an expanded sectional view for explaining the 2nd modification of the sealing device of a 3rd embodiment.

  Hereinafter, each embodiment of the bearing device according to the present invention will be described in detail with reference to the drawings.

(First embodiment)
First, with reference to FIGS. 1-7, 1st Embodiment of the bearing apparatus which concerns on this invention is described.

  As shown in FIG. 1, the bearing device 10 of the present embodiment includes a roll shaft 11, a plurality of roller bearings 12 that are rolling bearings fitted on the roll shaft 11, and a cylindrical roll fitted on the roller bearing 12. 13, and the roll 13 is supported so as to be rotatable relative to the roll shaft 11.

  The roll shaft 11 is formed with a radial hole 16 penetrating in the radial direction and an axial hole 17 formed in the axial direction from the shaft end portion of the roll shaft 11 and communicating with the radial hole 16. The axial hole 17 is connected to a compressed air supply source (not shown), and the compressed air is supplied into the bearing device 10 through the axial hole 17 and the radial hole 16.

  The roller bearing 12 has a plurality (four in this embodiment) of raceway surfaces 14 a formed on the outer peripheral surface of the pair of inner rings 14 and a plurality (two in the present embodiment) formed on the inner peripheral surface of the roll 13. A plurality of (four rows in this embodiment) rollers 15 are movably disposed between the raceway surface 13a. That is, in the roller bearing 12 of this embodiment, the roll 13 has a function of an outer ring.

  Sealing devices 20 are arranged on the outer sides in the axial direction of the roller bearings 12 to seal between the roll shaft 11 and the roll 13. As shown in FIG. 2, the sealing device 20 includes an inner ring member 21 that is a roll shaft side member, an outer ring member 22 that is a roll side member, and a pair of oil seals 23 and 24.

  The inner ring member 21 is a member formed in a ring shape, and an annular groove 25 is formed at a substantially central portion in the axial direction of the inner peripheral surface thereof, and penetrates radially from the annular groove 25 toward the outer peripheral surface. A plurality of nozzle holes 26 are formed at predetermined intervals in the circumferential direction. Further, on the inner peripheral surface of the inner ring member 21, O-ring grooves 27 in which O-rings 28 can be mounted are formed on both sides in the axial direction of the nozzle hole 26.

  The inner ring member 21 is externally fitted to the roll shaft 11, and is sandwiched between the axial outer end surface of the inner ring 14 and a retaining ring 29 attached to the roll shaft 11 to be positioned in the axial direction. As a result, the radial hole 16 of the roll shaft 11 communicates with the annular groove 25 and the nozzle hole 26 of the inner ring member 21, and the space between the roll shaft 11 and the inner ring member 21 is sealed by the O-rings 28 and 28. .

  The outer ring member 22 is a ring-shaped member, and an O-ring groove 30 in which an O-ring 31 can be mounted is formed on the outer peripheral surface thereof. In addition, a protrusion 32 that protrudes radially inward is formed over the entire circumference on the outer end in the axial direction of the inner peripheral surface of the outer ring member 22.

  Further, the outer ring member 22 is fitted into the roll 13 and is sandwiched between a step portion 13b of the roll 13 and a retaining ring 34 attached to the roll 13 via a ring member 33 which will be described later. Positioning has been performed. Thereby, the space between the roll 13 and the outer ring member 22 is sealed by the O-ring 30.

  Between the inner ring member 21 and the outer ring member 22, a first oil seal 23 as a first seal part and a second oil seal 24 as a second seal part are arranged in parallel in the axial direction. The first oil seal 23 is disposed adjacent to the roller bearing 12, that is, on the side far from the shaft end of the roll shaft 11, and the second oil seal 24 is disposed on the side away from the roller bearing 12, that is, the roll shaft 11. It is arranged on the side closer to the shaft end.

  The first and second oil seals 23 and 24 are substantially L-shaped core bars 40A and 40B, elastic members 41A and 41B formed from rubber or the like containing the core bars 40A and 40B, and elastic members 41A and 41A, respectively. A ring-shaped spring that is attached to the outer peripheral surface side of the lip portions 42A and 42B and applies a compression force between the lip portions 42A and 42B and the inner ring member 21. 43A, 43B.

  Further, in the present embodiment, as shown in FIG. 2, the first and second oil seals 23, 24 are arranged inside the outer ring member 22 with the lip portions 42 </ b> A, 42 </ b> B facing the axial end direction of the roll shaft 11. It is assembled by fitting inside the peripheral surface.

  Specifically, the elastic member 41 </ b> B of the second oil seal 24 is fitted to the inner peripheral surface of the outer ring member 22 and abuts against the protrusion 32 of the outer ring member 22, and further, the first oil seal is interposed via the spacer 45. 23 elastic members 41A are fitted, and the ring member 33 prevents the elastic members 41A from coming out.

  Thereby, the lip portions 42 </ b> A and 42 </ b> B of the first and second oil seals 23 and 24 are in sliding contact with the outer peripheral surface of the inner ring member 21. The nozzle hole 26 of the inner ring member 21 opens into a seal space 50 defined by the inner ring member 21, the first and second oil seals 23 and 24, and the spacer 45.

  In the bearing device 10 of this embodiment configured as described above, when the rotation of the roll 13 is stopped, the lip portions 42A and 42B of the first and second oil seals 23 and 24 are tightened by the springs 43A and 43B. The outer ring surface of the inner ring member 21 is in contact with the force. Therefore, intrusion of foreign matter such as water and dust from the outside is prevented by the second oil seal 24. Further, even if foreign matter enters the seal space 50 through the second oil seal 24, the first oil seal 23 reliably prevents the foreign matter from entering the bearing 12.

  Further, leakage of lubricant such as grease from the bearing device 10 is prevented by the first oil seal 23. The foreign matter intrusion prevention function and the lubricant leakage prevention function are also obtained by the O-rings 28 and 30.

  When the roll 13 is rotating, compressed air is supplied from a compressed air supply source (not shown) to the seal space 50 through the axial hole 17, the radial hole 16, the annular groove 25, and the nozzle hole 26. The As a result, the lip portion 42B of the second oil seal 24 is elastically deformed in the direction in which the diameter is increased by the compressed air (outside in the radial direction), and the compressed air is discharged to the outside from the gap between the lip portion 42B and the inner ring member 21. The Therefore, the second oil seal 24 is sealed with compressed air while the roll 13 is rotating.

  Further, since the lip portion 42B of the second oil seal 24 is not in contact with the inner ring member 21 while the roll 13 is rotating, the friction torque generated by the contact between the lip portion 42B and the inner ring member 21 is reduced and energy consumption is reduced. It is suppressed. Further, since the contact between the lip portion 42A of the first oil seal 23 and the outer peripheral surface of the inner ring member 21 is maintained, leakage of the lubricant from the bearing device 10 is prevented. Further, the closer the nozzle hole 26 is to the outer side in the axial direction of the bearing device 10, that is, the closer it is to the second oil seal 24, the more effective it is to prevent foreign matter from entering. Further, the closer to the first oil seal 23, the more effective the prevention of lubricant leakage from the inside.

  As described above, according to the bearing device 10 of the present embodiment, the seal device 20 having the first and second oil seals 23 and 24 arranged in parallel in the axial direction is arranged outside the roller bearing 12 in the axial direction. In addition, since compressed air is supplied to the seal space 50 between the first and second oil seals 23 and 24 through the nozzle hole 26, not only when the rotation of the roll 13 is stopped but also when the roll 13 is rotated. In addition, it is possible to prevent foreign matter from entering the bearing device 10 and to prevent leakage of the lubricant from the bearing device 10. Thereby, durability of the bearing apparatus 10 can be improved and it can be made long life.

  Further, according to the bearing device 10 of the present embodiment, the seal device 20 is unitized by integrally assembling the inner ring member 21, the outer ring member 22, the first oil seal 23, and the second oil seal 24. The seal device 20 can be easily assembled to the bearing device 10. Further, even if a malfunction such as a sealing failure occurs in the sealing device 20, only the sealing device 20 can be easily replaced, so that the function can be restored in a short time and the downtime of the mechanical device can be greatly shortened. Can do.

  As a first modification of the present embodiment, as shown in FIG. 3, the first oil seal 23 is formed on the inner peripheral surface of the outer ring member 22 with the lip portion 42 </ b> A facing the center direction of the roll shaft 11. It is assembled. According to this modification, the compressed air supplied from the nozzle hole 26 also flows into the bearing 12 through the gap between the first oil seal 23 and the inner ring member 21, so this air flow is lubricated from the bearing device 10. Effectively prevents agent leakage.

  As a second modification of the present embodiment, as shown in FIG. 4, the first and second oil seals 23, 24 are in a state in which the lip portions 42 </ b> A, 42 </ b> B face the axial end direction of the roll shaft 11. The inner ring member 21 is assembled to the outer peripheral surface. In this case, the lip portions 42 </ b> A and 42 </ b> B of the first and second oil seals 23 and 24 are in sliding contact with the inner peripheral surface of the outer ring member 22. Further, a projecting portion 35 that protrudes radially outward and positions the first and second oil seals 23 and 24 in the axial direction is provided at the inner end portion in the axial direction of the outer peripheral surface of the inner ring member 21 over the entire circumference. It has been. A spacer 46 for positioning the first and second oil seals 23 and 24 in the axial direction is provided between the first and second oil seals 23 and 24. The spacer 46 has a nozzle hole 26. A through hole 46 a is formed at a position corresponding to the nozzle hole 26 and communicates with the nozzle hole 26. And according to this modification, since the 1st and 2nd oil seals 23 and 24 are attached to the inner ring member 21 which is a stationary side, it is not influenced by rotation of the roll 13, but stable sealing performance Can be obtained.

  As a third modification of the present embodiment, as shown in FIG. 5, the first oil seal 23 is assembled to the outer peripheral surface of the inner ring member 21 with the lip portion 42 </ b> A facing toward the center of the roll shaft 11. The second oil seal 24 is assembled to the outer peripheral surface of the inner ring member 21 with the lip portion 42B facing the axial direction of the roll shaft 11. In this case, the lip portions 42 </ b> A and 42 </ b> B of the first and second oil seals 23 and 24 are in sliding contact with the inner peripheral surface of the outer ring member 22. Further, similarly to the second modified example, a protrusion 35 and a spacer 46 are provided. According to this modification, the compressed air supplied from the nozzle hole 26 also flows into the bearing 12 through the gap between the first oil seal 23 and the inner ring member 21, so this air flow is lubricated from the bearing device 10. Effectively prevents the leakage of the agent, and the first and second oil seals 23, 24 are attached to the inner ring member 21 on the stationary side, so that the roll 13 is not affected by the rotation, Stable sealing performance can be obtained.

  As a fourth modification of the present embodiment, as shown in FIG. 6, the urging force of the lip portion 42 </ b> A against the inner ring member 21 by the spring 43 </ b> A of the first oil seal 23 is the lip of the spring 43 </ b> B of the second oil seal 23. It is set to be larger than the tightening force of the portion 42B against the inner ring member 21. According to this modification, the contact with the inner ring member 21 is maintained by the lip portion 42A of the first oil seal 23 having a large pressing force, and the nozzle is formed by the lip portion 42B of the second oil seal 23 having a small pressing force. Since the compressed air supplied from the hole 26 is efficiently discharged to the outside, it is possible to easily achieve both prevention of foreign matter intrusion and prevention of lubricant leakage. In addition, although this modified example demonstrated the sealing apparatus shown in FIG. 2 as an example, it is not limited to this, It can apply also to the sealing apparatus shown in FIGS. Further, the technical idea of making the tightening force of the first seal portion larger than the tightening force of the second seal portion of the present modification can be applied to the V-ring 61 described later.

  Further, as a fifth modification of the present embodiment, as shown in FIG. 7, a tapered surface 51 that gradually decreases in diameter toward the outer side in the axial direction is provided on the outer peripheral surface of the range where the sealing device 20 of the roll 13 is disposed. Is formed. And according to this modification, even if a big load acts on the roll 13, the influence by the bending of the roll 13, etc. does not reach the sealing device 20, and favorable sealing performance can be maintained. In addition, although this modified example demonstrated the bearing apparatus shown in FIG. 2 as an example, it is not limited to this, It is applicable also to the bearing apparatus shown in FIGS.

(Second Embodiment)
Next, a second embodiment of the bearing device according to the present invention will be described with reference to FIGS. Note that portions that are the same as or equivalent to those of the first embodiment are denoted by the same reference numerals in the drawings, and description thereof is omitted or simplified.

  In this embodiment, as shown in FIG. 8, a sealing device 60 is used instead of the sealing device 20 of the first embodiment. The sealing device 60 is composed of a combination of a first oil seal 23 that is a first seal portion and a V-ring 61 that is a second seal portion.

  The first oil seal 23 is assembled to the inner peripheral surface of the outer ring member 22 with the lip portion 42A facing the axial end of the roll shaft 11, and the lip portion 42A is in sliding contact with the outer peripheral surface of the inner ring member 21.

  The V-ring 61 is molded from an elastic material such as rubber, and is fitted to the outer peripheral surface of the inner ring member 21. And a lip portion 63 extending in the direction. The seal main body 62 is in contact with the axial inner side surface of the protruding portion 21 a that protrudes radially outward from the axial outer end portion of the outer peripheral surface of the inner ring member 21. The lip portion 63 is in sliding contact with the outer surface of the spacer 45 in the axial direction. The V ring 61 is particularly effective when there are many foreign objects such as iron powder.

  In the bearing device 10 of the present embodiment configured as described above, when the rotation of the roll 13 is stopped, the lip portion 42a of the first oil seal 23 is applied to the outer peripheral surface of the inner ring member 21 by the pressing force of the spring 43A. The lip portion 63 of the V ring 61 is in contact with the axially outer surface of the spacer 45. Therefore, intrusion of foreign matter such as water and dust from the outside is prevented by the V ring 61. Even if foreign matter enters the seal space 50 through the V-ring 61, the first oil seal 23 reliably prevents foreign matter from entering the bearing 12. Further, leakage of lubricant such as grease from the bearing device 10 is prevented by the first oil seal 23.

  When the roll 13 is rotating, compressed air is supplied from a compressed air supply source (not shown) to the seal space 50 through the axial hole 17, the radial hole 16, the annular groove 25, and the nozzle hole 26. The As a result, the lip portion 63 of the V ring 61 is elastically deformed outward in the axial direction by the compressed air, and the compressed air is discharged to the outside from the gap between the lip portion 63 and the spacer 45. Accordingly, the V-ring 61 is sealed with compressed air while the roll 13 is rotating.

  Further, since the lip portion 63 of the V ring 61 is not in contact with the spacer 45 while the roll 13 is rotating, the friction torque generated by the contact between the lip portion 63 and the spacer 45 is reduced and energy consumption is suppressed. Further, since the contact between the lip portion 42A of the first oil seal 23 and the outer peripheral surface of the inner ring member 21 is maintained, leakage of the lubricant from the bearing device 10 is prevented.

  As described above, according to the bearing device 10 of the present embodiment, the seal device 60 having the first oil seal 23 and the V ring 61 arranged in parallel in the axial direction is arranged on the outer side in the axial direction of the roller bearing 12. In addition, since compressed air is supplied to the seal space 50 between the first oil seal 23 and the V-ring 61 through the nozzle hole 26, the bearings can be used not only when the rotation of the roll 13 is stopped but also when the roll 13 is rotating. Intrusion of foreign matter into the device 10 can be prevented, and leakage of the lubricant from the bearing device 10 can be prevented. Thereby, durability of the bearing apparatus 10 can be improved and it can be made long life.

Further, according to the bearing device 10 of the present embodiment, the seal device 60 is a unit because the inner ring member 21, the outer ring member 22, the first oil seal 23, and the V ring 61 are integrally assembled. The sealing device 60 can be easily assembled to the device 10. Further, even if a malfunction such as a sealing failure occurs in the sealing device 60, only the sealing device 60 can be easily replaced, so that the function can be restored in a short time and the downtime of the mechanical device can be greatly shortened. Can do.
About another structure and an effect, it is the same as that of the said 1st Embodiment.

  As a first modification of the present embodiment, as shown in FIG. 9, the first oil seal 23 is disposed on the inner peripheral surface of the outer ring member 22 with the lip portion 42 </ b> A facing the center of the roll shaft 11. It is assembled. According to this modification, the compressed air supplied from the nozzle hole 26 also flows into the bearing 12 through the gap between the first oil seal 23 and the inner ring member 21, so this air flow is lubricated from the bearing device 10. Effectively prevents agent leakage.

  As a second modification of the present embodiment, as shown in FIG. 10, a tapered surface 51 that gradually decreases in diameter toward the outer side in the axial direction is provided on the outer peripheral surface of the range where the sealing device 60 of the roll 13 is disposed. Is formed. And according to this modification, even if a big load acts on the roll 13, the influence by the bending of the roll 13, etc. does not reach the sealing device 60, and favorable sealing performance can be maintained. In addition, although this modified example demonstrated the bearing apparatus shown in FIG. 8 as an example, it is not limited to this, It can apply also to the bearing apparatus shown in FIG.

(Third embodiment)
Next, a third embodiment of the bearing device according to the present invention will be described with reference to FIGS. Note that portions that are the same as or equivalent to those of the first embodiment are denoted by the same reference numerals in the drawings, and description thereof is omitted or simplified.

  In this embodiment, as shown in FIG. 11, a sealing device 70 is used instead of the sealing device 20 of the first embodiment. The sealing device 70 is composed of a combination of a first oil seal 23 that is a first seal portion and a labyrinth seal 71 that is a second seal portion.

  The first oil seal 23 is assembled to the inner peripheral surface of the outer ring member 22 with the lip portion 42A facing the axial end of the roll shaft 11, and the lip portion 42A is in sliding contact with the outer peripheral surface of the inner ring member 21.

  The labyrinth seal 71 is integrally formed on the outer peripheral surface of the inner ring member 21 on the outer side in the axial direction from the nozzle hole 26, and has a first labyrinth forming portion 72 having an inclined surface 72a that gradually increases in diameter toward the outer side in the axial direction. A second labyrinth forming portion 73 having an inclined surface 73a that is integrally formed on the outer peripheral surface on the axially outer side from the nozzle hole 26 of the 22 and gradually decreases in diameter toward the outer side in the axial direction. A predetermined labyrinth gap 74 is formed between the inclined surface 72 a and the inclined surface 73 a of the second labyrinth forming portion 73.

  In the bearing device 10 of the present embodiment configured as described above, when the rotation of the roll 13 is stopped, the lip portion 42a of the first oil seal 23 is applied to the outer peripheral surface of the inner ring member 21 by the pressing force of the spring 43A. A labyrinth gap 74 is formed between the first labyrinth forming portion 72 and the second labyrinth forming portion 73 of the labyrinth seal 71. Accordingly, intrusion of foreign matter such as water and dust from the outside is prevented by the labyrinth seal 71. Even if foreign matter enters the seal space 50 through the labyrinth seal 71, the first oil seal 23 reliably prevents foreign matter from entering the bearing 12. Further, leakage of lubricant such as grease from the bearing device 10 is prevented by the first oil seal 23.

  When the roll 13 is rotating, compressed air is supplied from a compressed air supply source (not shown) to the seal space 50 through the axial hole 17, the radial hole 16, the annular groove 25, and the nozzle hole 26. The As a result, the compressed air is discharged from the labyrinth gap 74 of the labyrinth seal 71 to the outside. Therefore, the labyrinth seal 71 is sealed with compressed air while the roll 13 is rotating. Even if foreign matter enters the labyrinth gap 74, the foreign matter moves along the inclined surface 73a by the centrifugal force of the rotating second labyrinth forming portion 73 and is discharged to the outside.

  In addition, the first labyrinth forming portion 72 and the second labyrinth forming portion 73 of the labyrinth seal 71 are not in contact with each other regardless of the presence or absence of compressed air, so that the friction torque is reduced and energy consumption is suppressed. Further, since the contact between the lip portion 42A of the first oil seal 23 and the outer peripheral surface of the inner ring member 21 is maintained, leakage of the lubricant from the bearing device 10 is prevented.

  As described above, according to the bearing device 10 of the present embodiment, the seal device 70 having the first oil seal 23 and the labyrinth seal 71 arranged in parallel in the axial direction is arranged on the outer side in the axial direction of the roller bearing 12. In addition, since the compressed air is supplied to the seal space 50 of the first oil seal 23 and the labyrinth seal 71 through the nozzle hole 26, the bearing device can be used not only when the roll 13 is stopped but also when the roll 13 is rotated. Intrusion of foreign matter into the inside of the bearing 10 can be prevented, and leakage of the lubricant from the bearing device 10 can be prevented. Thereby, durability of the bearing apparatus 10 can be improved and it can be made long life.

Further, according to the bearing device 10 of the present embodiment, the seal device 70 is unitized by integrally assembling the inner ring member 21, the outer ring member 22, the first oil seal 23, and the labyrinth seal 71. The sealing device 70 can be easily assembled to the device 10. Further, even if a malfunction such as a sealing failure occurs in the sealing device 70, only the sealing device 70 can be easily replaced, so that the function can be restored in a short time and the downtime of the mechanical device can be greatly shortened. Can do.
About another structure and an effect, it is the same as that of the said 1st Embodiment.

  As a first modification of the present embodiment, as shown in FIG. 12, the first oil seal 23 is formed on the inner peripheral surface of the outer ring member 22 with the lip portion 42 </ b> A facing toward the center of the roll shaft 11. It is assembled. According to this modification, the compressed air supplied from the nozzle hole 26 also flows into the bearing 12 through the gap between the first oil seal 23 and the inner ring member 21, so this air flow is lubricated from the bearing device 10. Effectively prevents agent leakage.

  Further, as a second modification of the present embodiment, as shown in FIG. 13, a tapered surface 51 that gradually decreases in diameter toward the outer side in the axial direction is provided on the outer peripheral surface of the range where the sealing device 70 of the roll 13 is disposed. Is formed. And according to this modification, even if a big load acts on the roll 13, the influence by the bending of the roll 13, etc. does not reach the sealing device 70, and favorable sealing performance can be maintained. In addition, although this modified example demonstrated the bearing apparatus shown in FIG. 11 as an example, it is not limited to this, It is applicable also to the bearing apparatus shown in FIG.

In addition, this invention is not limited to what was illustrated to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.
For example, in each of the above embodiments, the case where the present invention is applied to a backup roll used for a leveler of a rolling mill for steel is exemplified, but the present invention is not limited thereto, and various machines used under severe conditions in the external environment. The present invention may be applied to a bearing device.
Moreover, in each said embodiment, although the case where two sealing parts were arrange | positioned in the sealing apparatus was illustrated, it is not limited to this, You may arrange | position three or more sealing parts in a sealing apparatus, The arrangement number There is no limit. When three or more seal portions are arranged, it is preferable to supply compressed air at least between the outermost seal portion and the second seal portion.

10 Bearing Device 11 Roll Shaft 12 Roller Bearing (Rolling Bearing)
13 Roll 20 Sealing device 21 Inner ring member (roll shaft side member)
22 Outer ring member (roll-side member)
23 First oil seal (first seal part)
24 Second oil seal (second seal part)
26 Nozzle hole 28 O-ring 31 O-ring 32 Projection 45 Spacer (roll-side member)
DESCRIPTION OF SYMBOLS 50 Seal space 51 Tapered surface 60 Sealing device 61 V ring 62 Seal main body 63 Lip part 70 Sealing device 71 Labyrinth seal 72 1st labyrinth formation part 73 2nd labyrinth formation part 74 Labyrinth gap

Claims (4)

A bearing device comprising: a roll shaft; a rolling bearing that is externally fitted to the roll shaft; and a roll that is externally fitted to the rolling bearing and is supported so as to be relatively rotatable with respect to the roll shaft,
A seal device having a plurality of seal portions arranged in parallel in the axial direction, and disposed between the rolling bearings in the axial direction and sealing between the roll shaft and the roll;
A nozzle hole that opens between the plurality of seal portions and supplies a compressed fluid , and
The sealing device is formed in a cylindrical shape, an O-ring is disposed on the inner peripheral surface, and an inner ring member provided with the nozzle hole penetrating in a radial direction at a substantially central portion in the axial direction;
An outer ring member formed in a cylindrical shape and provided with an O-ring on the outer peripheral surface;
A first seal portion disposed between one end side in the axial direction with respect to the nozzle hole of the inner ring member and the outer ring member and sealing between the inner ring member and the outer ring member;
A second seal portion disposed between the other end side in the axial direction and the outer ring member with respect to the nozzle hole of the inner ring member, and sealing between the inner ring member and the outer ring member;
The inner ring member, the outer ring member, the first seal portion, and the second seal portion are integrally assembled as a unit device. The sealing device includes a first seal portion disposed on the rolling bearing side, and a second sealing portion disposed axially outward from the first sealing portion,
The first seal portion is fixed to one of the roll shaft side member and the roll side member, and an elastic lip portion slides on the other peripheral surface of the roll shaft side member and the roll side member. Oil seal
The second seal portion is fixed to one of the roll shaft side member and the roll side member, and an elastic lip portion slides on the other peripheral surface of the roll shaft side member and the roll side member. An oil seal in contact, a V ring fixed to one of the roll shaft side member and the roll side member and having a resilient lip portion slidingly contact the other side surface of the roll shaft side member and the roll side member; 2. The bearing device according to claim 1, wherein the roll shaft side member and the roll side member are any one of labyrinth seals arranged to face each other with a slight labyrinth gap. The first seal portion is the oil seal, and the second seal portion is the oil seal or the V-ring;
3. The bearing device according to claim 2, wherein a pressing force of the first seal portion against the mating member of the lip portion is set larger than a pressing force of the second seal portion against the mating member of the lip portion. . The roll according to at least the the outer circumferential surface of the range in which the sealing device is arranged, claim 1-3 to gradually wherein the tapered surface whose diameter is formed toward the axially outward Bearing device.

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