JP4952284B2 - Bearing sealing device and bearing unit - Google Patents

Description

  The present invention relates to a sealing device and a bearing unit for a split type rolling bearing unit or the like that can be applied to a continuous casting facility or the like.

  The continuous casting equipment is equipped with a driven roll and a non-driven roll to transmit the rotational force, and the roll is reduced in diameter to prevent accidents such as breakout during operation. A support bearing is arranged at the end of the roll. Further, a support bearing is disposed in the center in order to compensate for the insufficient strength of the shaft due to the reduced diameter of the drive roll. Further, since the non-driving roll is also lightly reduced, a support bearing is arranged at the center in order to compensate for the insufficient strength of the shaft.

  Since the neck diameter of the support bearing arranged in the center of the roll is smaller than the roll diameter, the roll imitates a bowl shape. Since the support bearing cannot be assembled from the shaft end in the center of the saddle-shaped roll, the metal material part is divided into two parts in the axial direction and the rubber material part is divided into one part in the axial direction. These are incorporated from the radial direction perpendicular to the axis (for example, see Patent Document 1 below).

  Lubricating the support bearing as described above is performed by centralized lubrication or an oil-and-air system. However, in recent years, lubricants that have been lubricated have been recovered due to environmental problems and reduction of lubricants. Since the recovery of the lubricant is returned from the degreaser pipe in the axle box, a large back pressure is generated in the axle box, and a large pressure load is applied to the seal to maintain the inner pressure in the axle box. Since the above-mentioned seal is divided into one part in the axial direction and incorporated, the split surface is opened by the seal lip when the pressure in the shaft box increases, or the seal body rotates together with the rotational sliding resistance of the seal lip. It will occur.

Although the following patent document 2 discloses the rotary bearing unit used in the pinch roll support part of the continuous casting equipment, there is no description about the state of the detent of the seal or the state of the split mating surface of the seal. Moreover, although the following patent documents 3 and 4 have a description regarding the rotation prevention of a seal | sticker, there is no description of the state of the division | segmentation joining surface of a seal | sticker. Moreover, although the following patent document 5 has description regarding the incorporating property of a seal | sticker main body, there is no description of the rotation prevention of a seal | sticker.
JP 62-278314 A Japanese Utility Model Publication No. 63-157522 Japanese Patent Laid-Open No. 04-302714 Japanese Patent Laid-Open No. 04-331821 Japanese Patent Publication No. 63-67066

  In the divided seal, the seal lip that slides with the outer peripheral surface and the tightening allowance and the seal body mounted in the groove on the rotation side are subjected to the rotational sliding resistance of the seal lip due to the increase in the internal pressure load of the axle box, In some cases, the split surface of the seal has a side that contracts in the rotational direction and an extended side, and a gap is generated in the split surface by the seal lip, and foreign matter and cooling water enter. In addition, since it slides on the outer peripheral surface with a tightening margin compared to a normal shaft seal, the rotational sliding resistance is large, and furthermore, the internal pressure in the shaft box is increased to generate a large back pressure on the seal. Dynamic resistance increases, so-called co-rotation that causes the seal to swell, causing a gap on the split surface with the seal lip, damage to the seal lip, lowering the seal function, and wear on the seal body, A gap is formed between the main body and the groove, and foreign matter or cooling water enters. For this reason, foreign matter and cooling water intrude into the support bearing, causing rust, and the lubrication state is deteriorated, resulting in a problem of shortening the life of the bearing.

  SUMMARY OF THE INVENTION In view of the above-described problems of the prior art, the present invention provides a bearing sealing device and bearing unit capable of improving the sealing performance of a seal having a split portion in the bearing and preventing co-rotation that impairs the sealing performance of the seal. The purpose is to provide.

To achieve the above object, a bearing sealing device according to the present invention includes a seal having a seal body made of an elastic material and a lip portion that slides on a sliding surface on the outer ring side or the axle box side of the bearing, Fixing means for fixing a seal body in a circumferential direction to the inner ring side of the bearing, wherein the seal is a split part provided at one place so as to be separable in the circumferential direction; Two engagement portions provided on the inner peripheral surface of the seal body close to the division portion and sandwiching the division portion, and the bearing has two engagement portions with which the respective engagement portions are engaged. The inner ring has a seal groove in which an engaged portion is provided and the seal body is fitted, and the seal is fitted in the seal groove by engaging the engagement portion of the seal with the engaged portion of the seal groove. In the state, the seal has a short peripheral side between the engaging portions sandwiching the divided portion Is configured to be elastically deformed compressive force is applied between the divided surfaces of the divided parts, a linear or thin plate-like metal in a long perimeter side of the seal is embedded inside the seal body, said linear Or both the front-end | tips of a thin plate-shaped metal have penetrated into the said engaging part, It is characterized by the above-mentioned.

  According to this bearing sealing device, the seal is engaged with the engaged portion of the seal groove, and the seal is fitted in the seal groove. Since the elastic surface is deformed on the short circumference side and a compressive force is applied between the split surfaces of the split portion, the split surfaces always receive the compressive force in the split portion, the split surfaces remain closed, and a gap is generated in the split surface This eliminates the problem and improves the sealing performance at the divided portion of the seal. In this way, it is possible to improve and improve the sealing performance of the seal having the divided portion.

  In the bearing sealing device, the short circumferential length between the engaging portions sandwiching the seal split portion is slightly longer than the short circumferential length between the engaged portions of the seal groove. By being set, a compressive force can be applied between the dividing surfaces of the dividing portion.

  In addition, the short circumferential arc pitch angle θ1 between the engaging portions sandwiching the split portion of the seal is set larger than the short circumferential arc pitch angle θ2 between the engaged portions of the seal groove. Thus, a compressive force can be applied between the split surfaces of the split portions.

Also, the more and this to seal a long perimeter side linear or thin plate-like metal in is embedded inside the seal body, even if the rotation sliding resistance of the lip portion is increased, the seal body Since expansion and contraction are suppressed, co-rotation of the seal is suppressed, and wear of the seal body in the seal groove can be prevented, sealing performance between the seal body and the seal groove is not impaired.

In this case, more and this both tips of the linear or thin plate-like metal intrudes into the engagement portion, the convex portion of the seal body is reinforced by a linear or a thin plate-like metal, convex portion It is possible to prevent the occurrence of chipping and co-rotation of the seal due to the rotational sliding resistance of the elastic material alone.

  Further, it is preferable that the engaging portion of the seal is formed as a protruding portion, and the engaged portion of the seal groove is formed as a recessed portion corresponding to the protruding portion.

Another bearing sealing device according to the present invention includes a seal body made of an elastic material, a seal having a lip portion that slides against a sliding surface on the outer ring side or the axle box side of the bearing, and the seal body is attached to the bearing. A sealing means for fixing to the inner ring side of the inner ring side in a circumferential direction, wherein the seal is divided in one place so as to be separable in the circumferential direction, and the seal is divided Two engaging portions provided on the inner peripheral surface of the seal body close to the dividing portion and sandwiching the portion, and the bearing has two engaged portions with which the engaging portions engage And a seal groove into which the seal body is fitted is formed in the inner ring, and a linear or thin plate-like metal on the long circumferential side other than the short circumferential part sandwiching the divided part of the seal is formed on the seal body. embedded therein, both ahead of the linear or thin plate-like metal There characterized in that it enters into the engagement portion.

  According to this bearing sealing device, the linear or thin plate-like metal is embedded inside the seal body on the long peripheral side other than the short peripheral part sandwiching the split part of the seal. Even if the rotational sliding resistance increases, the expansion and contraction of the seal body is suppressed, the co-rotation of the seal is suppressed, and wear of the seal body in the seal groove can be prevented. The sealing performance is not impaired. In this way, it is possible to improve and improve the sealing performance of the seal having the divided portion.

More and this both tips of the linear or thin plate-like metal in the sealing device for the bearing is penetrated into the engagement portion, the convex portion of the seal body is reinforced by a linear or a thin plate-like metal, It is possible to prevent the occurrence of co-rotation of the defect and the seal when the convex portion receives the rotational sliding resistance of the elastic material alone.

  Further, it is preferable that the engaging portion of the seal is formed as a protruding portion, and the engaged portion of the seal groove is formed as a concave portion corresponding to the protruding portion.

  A bearing unit according to the present invention includes any one of the above-described bearing sealing devices, and is attached to a neck portion of a roll of a steel facility. According to this bearing unit, even if the seal is provided with a split portion for attachment to the neck portion of the roll, the sealing performance at the seal split portion is improved and the sealing performance of the seal is improved. Water can be effectively prevented from entering, rust is not generated inside the bearing and the lubrication state is not deteriorated, and the life of the bearing unit can be extended.

  ADVANTAGE OF THE INVENTION According to this invention, the sealing device for bearings and a bearing unit which can implement | achieve the improvement of the sealing performance of the seal | sticker which has a division part in a bearing, and prevention of the joint rotation which inhibits the sealing performance of a seal | sticker can be provided.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view schematically showing a split type rolling bearing unit according to the present embodiment.

  As shown in FIG. 1, the split type rolling bearing unit 10 includes an inner ring 11 fixed to the neck portion 2 of the roll 1, a housing 13, an outer ring 14, a raceway surface 11 a of the inner ring 11, and a raceway surface of the housing 13. 13a, and a plurality of cylindrical rollers 12 as rolling elements arranged in a single row for a round at a predetermined pitch between the raceway surface 14a of the outer ring 14.

  A raceway surface 11a is formed between the flange portions 11b and 11b so that the cylindrical roller 12 is rotatively positioned at the center of the inner ring 11 in the direction of the rotation axis p of the roll 1 of FIG. 1, and the rotation axis of each flange portion 11b. Seal grooves 11c and 11c are formed as seal mounting portions on the outer side in the p direction, and seals 15 and 15 of the sealing device are fitted in the seal grooves 11c and 11c. Seal rings 17 and 17 are attached to the outer side of the seal groove 11 c of the inner ring 11.

  Labyrinth rings 16, 16 are fixed to the left and right ends of the housing 13 in the direction of the rotation axis p to form an inner diameter surface 13 b of the housing 13, and the tip 16 a extends into an annular groove 1 a formed on the end surface of the roll 1. Yes. The inner diameter surface 13 b of the labyrinth ring 16 and the inner ring 11 side are sealed by a seal 15 and further sealed by a seal ring 17.

  A support base 18 is provided below the housing 13 in FIG. 1, and a lubricant passage 18 a for supplying a lubricant is formed in the support base 18 as indicated by a broken line in the figure.

  As shown in FIG. 1, the split type rolling bearing unit 10 is preferably applied to, for example, a vertical roll having a small-diameter neck 2 in a roll 1 of a continuous casting facility, and further supports the roll 1 at positions away from both ends. Since the neck portion 2 is smaller in diameter than the roll 1, the neck portion 2 is configured in a split type that can be separated in the circumferential direction. That is, each component of the rolling bearing unit 10 is a divided component separated in the circumferential direction, and after being assembled into the neck portion 2 of FIG. 1 from a direction orthogonal to the direction of the rotation axis p, a fastening means such as a fastening bolt is provided. Are integrated. As such fastening means, for example, the one of the above-mentioned Patent Document 1 by the present applicant can be used.

  Next, a sealing device using the seal 15 of FIG. 1 and the seal groove 11c of the inner ring 11 will be described with reference to FIGS.

  FIG. 2 is a sectional side view of the seal 15 of the sealing device of FIG. FIG. 3 is a front view of the seal 15 of FIG. 4 is a front view of the main part of the seal 15 of FIG. FIG. 5 is a cross-sectional view of the inner ring 11 of FIG. 1 taken along the one-dot chain line AA of FIG. 6 is a cross-sectional view of the main part of the inner ring of FIG. FIG. 7 is a cross-sectional view of an essential part showing a state of sealing when the seal 15 of FIGS. 2 to 4 is fitted in the seal groove of the inner ring as shown in FIG. .

  As shown in FIGS. 1 to 4, the sealing device of the rolling bearing unit 10 of FIG. 1 includes a seal 15 and an elastic metal ring 24 as a fixing means of the seal 15. The seal 15 is made of elastic rubber in a ring shape as a whole, and includes a seal body 21 having a substantially rectangular longitudinal section, and a lip portion 22 extending obliquely outward from the seal body 21. The elastic rubber is preferably heat resistant.

  The elastic metal ring 24 is located in the circular groove 23 on the outer periphery of the seal body 21 when the seal 15 is incorporated in the inner ring 11, and fixes the seal body 21 to the inner ring 11 side in the circumferential direction. For example, it can be comprised from the coil spring which consists of metal materials, such as steel. As a result, the seal 15 can be reliably fixed in the circumferential direction in the seal groove 11 c of the inner ring 11.

  3 and 4, the seal 15 has a split portion 27 that can be separated in the circumferential direction at one place of the seal main body 21, and a pair of convex portions 26 and 26 are provided in the vicinity of the split portion 27. 21 is provided so as to protrude to the inner peripheral surface side.

  In addition, a metal wire 25 made of steel or the like is embedded in the seal body 21 on the long circumferential side excluding a short circumferential portion sandwiching the dividing portion 27, and both ends 25a of the metal wire 25 are convex portions. 26, 26.

  At the bottom of the seal groove 11c of the inner ring 11 into which the seal 15 is fitted, as shown in FIG. 5 and FIG. 6, a convex portion 26 is provided at a position corresponding to the convex portions 26, 26 provided on the inner peripheral surface of the seal body 21. Engaging recesses 11d and 11d are formed. When the seal 15 is fitted into the seal groove 11c of the inner ring 11, the convex portion 26 of the seal 15 is engaged with the concave portion 11d of the seal groove 11c.

  3 and FIG. 4, the peripheral portion 28 on the short peripheral side between the convex portions 26 and 26 with the division portion 27 interposed therebetween has the concave portions 11 d and 11 d of the seal groove 11 c of the inner ring 11 of FIG. 5 and FIG. 6. The pitch is set slightly longer than the peripheral portion 29 on the short peripheral side. As shown in FIGS. 3 to 6, the short circumferential length between the concave portions 11d and 11d of the seal groove 11c is such that the arc pitch angle θ1 on the short circumferential side between the convex portions 26 and 26 sandwiching the divided portion 27 of the seal 15 is. Is set larger than the arc pitch angle θ2 on the side.

  The arc pitch angle θ3 on the long peripheral side of the seal 15 in FIG. 3 is smaller than the arc pitch angle θ4 on the long peripheral side of the seal groove 11c in FIG. Further, the center c of the arc pitch angles θ1 and θ3 in FIG. 3 and the center d of the arc pitch angles θ2 and θ4 in FIG. 5 substantially coincide with each other when the seal 15 is fitted in the seal groove 11c of the inner ring 11.

  In the state where the seal 15 having the above-described split portion 27 is separated by the split portion 27, the seal 15 is fitted into the seal groove 11c of the inner ring 11 fixed to the neck portion 2 as shown in FIGS. The rolling bearing unit 10 can be attached to the roll 1 by incorporating. As a result, as shown in FIG. 7, the seal body 21 of the seal 15 is fixed in the seal groove 11 c of the inner ring 11, and the lip portion 22 abuts against the inner diameter surface 13 b of the housing 13. From this state, the bearing interior 10a is sealed by elastic deformation as shown by a solid line.

  As described above, in the seal 15, the short peripheral side portion 28 between the convex portions 26, 26 sandwiching the dividing portion 27 is slightly more than the short peripheral side portion 29 between the concave portions 11 d, 11 d of the seal groove 11 c. Since the pitch is set to be long, the peripheral portion on the short peripheral side in a state where the convex portion 26 of the seal body 21 is engaged with the concave portion 11d of the seal groove 11c and the seal 15 is fitted in the seal groove 11c of the inner ring 11. 28 is slightly elastically deformed in the compression direction across the dividing portion 27. Due to the compression elastic deformation of the peripheral portion 28, a compressive force is generated between the split surfaces of the split portion 27. By generating a compressive force on the split surface of the split portion 27 in this way, the split surfaces always receive the compressive force, so the split portion 27 is closed and no gap is generated.

  That is, the lip portion 22 of the seal 15 has a tightening margin indicated by a broken line and a solid line as shown in FIG. Even if the split surface of the split part 27 receives a rotational sliding resistance from the slide surface and the split side of the split part 27 is shrunk in the rotation direction and the extended side is generated to open the lip part 22, as described above, the compression elastic deformation of the peripheral part 28 is achieved. Since the compression force due to is applied to the dividing surface of the dividing portion 27, the dividing surfaces always receive the compressive force with each other, and the dividing surfaces are not closed and no gap is generated.

  Therefore, even if the internal pressure of the bearing interior 10a of the rolling bearing unit 10 rises, no gap is generated in the split portion 27 of the seal 15, and no gap is generated in the lip portion 22 at the split portion 27. Therefore, foreign matter and cooling water can be prevented from entering the bearing interior 10a of the rolling bearing unit 10, and rust is not generated in the bearing interior 10a and the lubrication state is not deteriorated. The lifetime of the unit 10 can be extended.

  In particular, even when the rolling bearing unit 10 is applied to the neck portion 2 of the roll 1 of the continuous casting equipment and a high-temperature slab or the like is transported and the cooling water or the scale easily enters the inside of the bearing, It is possible to effectively prevent the cooling water, scale and the like from entering the bearing interior 10a.

  Further, even when the rotational sliding resistance of the lip portion 22 of the seal 15 with respect to the inner diameter surface 13b of the housing 13 is increased during use of the rolling bearing unit 10, the inside of the seal body 21 is as shown in FIGS. In addition, since the metal wire 25 is embedded on the long circumferential side, the expansion and contraction of the seal body 21 is suppressed, the co-rotation of the seal 15 is suppressed, and the wear of the seal body 21 in the seal groove 11c can be prevented. . For this reason, since the sealing performance between the seal body 21 and the sealing groove 11c is not impaired, the sealing performance of the seal 15 having the divided portion 27 can be improved and improved.

  Furthermore, since both ends 25a of the metal wire 25 inside the seal body 21 enter the projections 26, 26 protruding from the seal body 21, the projection 26 is reinforced by the metal wire 25, and the projection 26 is elastic rubber. It is possible to prevent the occurrence of co-rotation of the seal 15 and the chipping caused by receiving the rotational sliding resistance as a single unit.

  As described above, since the occurrence of co-rotation of the seal 15 can be prevented, the seal main body 21 is not worn, and no gap is generated between the seal main body 21 and the seal groove 11c. Intrusion of foreign matters such as scales and cooling water into the bearing interior 10a can be prevented, and rusting and the lubrication state are not deteriorated. Therefore, the life of the rolling bearing unit 10 can be extended.

  As described above, according to the present embodiment, the split type rolling bearing unit 10 provided with the sealing device as shown in FIGS. 1 to 7 can be applied mainly to vertical rolls of continuous casting equipment of steel equipment, The sealability of the split portion 27 of the seal 15 can be improved and the prevention of co-rotation of the seal 15 that impedes the sealability can be enhanced, so that the life of the rolling bearing unit 10 can be extended.

  As described above, the best mode for carrying out the present invention has been described. However, the present invention is not limited to these, and various modifications are possible within the scope of the technical idea of the present invention. For example, the rolling bearing unit in FIG. 1 has a single-row cylindrical roller bearing structure, but the present invention is not limited to this, and may have a double-row cylindrical roller bearing structure. It is good also as a structure of a center roller bearing.

  8 is divided into two rows on both sides of the cage 35 between the inner ring 31 and the outer ring 34 or the housing 33 fixed to the neck portion 2 of the roll 1. A plurality of held rollers 32 are arranged as rolling elements, a sealing device similar to that shown in FIGS. 1 to 7 is arranged, and a similar seal 15 is arranged to seal the bearing interior 30a. The rolling bearing unit 30 can be applied to a vertical roll 1 having a neck portion 2 of a continuous casting facility of a steel facility. In this case, the sealing performance at the split portion 27 (FIGS. 3 and 4) of the seal 15 is improved. This can be improved and the prevention of co-rotation of the seal 15 that impairs the sealing performance can be strengthened, so that the life of the rolling bearing unit 30 can be extended.

It is a longitudinal section showing roughly the division type rolling bearing unit by this embodiment. It is a sectional side view of the seal 15 of the sealing device of FIG. It is a front view of the seal | sticker 15 of FIG. It is a principal part front view of the seal | sticker 15 of FIG. It is sectional drawing which cut | disconnected the inner ring | wheel 11 of FIG. 1 by the dashed-dotted line AA of FIG. It is principal part sectional drawing of the inner ring | wheel of FIG. It is principal part sectional drawing which shows a mode that it seals, when the seal | sticker 15 of FIGS. 2-4 is inserted in the seal groove | channel of an inner ring | wheel like FIG. It is a figure which shows the modification of this Embodiment, and is a longitudinal cross-sectional view which shows roughly the division | segmentation type rolling bearing unit by a self-aligning roller bearing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roll 2 Neck part 10 Rolling bearing unit 10a Bearing inside 11 Inner ring 11c Seal groove 11d Recessed part (engaged part)
12 Cylindrical rollers (rolling elements)
13 Housing (shaft box)
13b Inner diameter surface, sliding surface 14 Outer ring 15 Seal 21 Seal body 22 Lip part 24 Elastic metal ring (fixing means)
25 Metal wire (Linear or thin plate metal)
25a Both ends of metal wire 26 Convex part (engagement part)
27 Divided portion 28 Seal circumferential length 29 Seal groove circumferential length 30 Rolling bearing unit 30a Bearing interior θ1, θ3 Arc pitch angle of seal θ2, θ4 Arc pitch angle of seal groove

Claims (7)

A seal having a seal body made of an elastic material and a lip portion that slides on a sliding surface on the outer ring side or the axle box side of the bearing, and fixing for fixing the seal body to the inner ring side of the bearing in the circumferential direction A bearing sealing device comprising:
The seal includes a split portion provided at one place so as to be separable in the circumferential direction, and two engagement portions provided on an inner peripheral surface of the seal body with the split portion interposed therebetween and close to the split portion. Have
The bearing has two engaged portions with which the respective engaging portions are engaged, and has a seal groove in the inner ring into which the seal body is fitted,
With the engagement portion of the seal engaged with the engaged portion of the seal groove and the seal fitted in the seal groove, the seal has a short circumference between the engagement portions sandwiching the divided portion. It is configured such that a compressive force is applied between the split surfaces of the split part by elastically deforming on the long side ,
On the long peripheral side of the seal, a linear or thin plate metal is embedded inside the seal body,
A bearing sealing device, wherein both ends of the linear or thin plate-like metal are inserted into the engaging portion .   The short circumferential length of each of the engaging portions sandwiching the seal divided portion is set slightly longer than the short circumferential length of each of the engaged portions of the seal groove. The bearing sealing device according to 1.   The short circumferential length arc pitch angle θ1 between the engaging portions sandwiching the split portion of the seal is set larger than the short circumferential length arc pitch angle θ2 between the engaged portions of the seal groove. The bearing sealing device according to claim 1 or 2. The bearing according to any one of claims 1 to 3 , wherein the engaging portion of the seal is formed as a protruding portion, and the engaged portion of the seal groove is formed as a recess corresponding to the protruding portion. Sealing device. A seal having a seal body made of an elastic material and a lip portion that slides on a sliding surface on the outer ring side or the axle box side of the bearing, and fixing for fixing the seal body to the inner ring side of the bearing in the circumferential direction A bearing sealing device comprising:
The seal has a split portion provided at one place so as to be separable in the circumferential direction, and two engagements provided on the inner peripheral surface of the seal body sandwiching the split portion of the seal and close to the split portion And
The bearing has two engaged portions with which the respective engaging portions are engaged, and has a seal groove in the inner ring into which the seal body is fitted,
On the long peripheral side other than the short peripheral part sandwiching the split part of the seal, a linear or thin plate-like metal is embedded inside the seal body ,
A bearing sealing device, wherein both ends of the linear or thin plate-like metal are inserted into the engaging portion . The bearing sealing device according to claim 5 , wherein the engaging portion of the seal is formed as a protruding portion, and the engaged portion of the seal groove is formed as a recess corresponding to the protruding portion. Comprising a bearing sealing device according to any one of claims 1 to 6, the bearing unit, characterized in that attached to the neck of the roll of steel equipment.

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