JP4506262B2 - Sealing means for rolling bearing unit Rolling bearing unit - Google Patents

Description

  The present invention relates to a sealing means for a split type rolling bearing unit mainly used for a saddle-shaped roll of a continuous casting facility of a steel facility, and relates to an improvement in the sealing performance of a mating surface of split portions of a sealing device.

The continuous casting equipment has a driven roll and a non-driven roll to transmit the rotational force. To prevent accidents such as breakout during operation, the roll is reduced in diameter to reduce the roll pitch, and a large number of rolls are placed in the segment. A support bearing (for example, a self-aligning roller bearing) is disposed at the roll end.
In addition, the drive roll is provided with a support bearing (such as a full-roller split bearing) in the center due to insufficient shaft strength due to the reduced diameter. Further, since the non-driving roll is lightly reduced, a support bearing is arranged in the center in order to compensate for the insufficient strength of the shaft.

The neck diameter of the support bearing arranged at the center of such a roll is smaller than the roll diameter and has a bowl shape.
Therefore, the support bearing incorporated in the center of the bowl-shaped roll in this way needs to be assembled from the radial direction perpendicular to the shaft center. Therefore, a metal material component (for example, a bearing race such as an outer ring and an inner ring, The housing is divided into two in the axial direction, for example, a split bearing (split type bearing) is adopted, and elastic products such as rubber materials (for example, sealing devices made of elastic materials such as rubber materials) are provided in one circumferential direction. The structure which has this division part is employ | adopted (for example, refer patent document 1 thru | or 3).
No. 6-4098 JP-A-4-302714 Japanese Patent Laid-Open No. 4-331818

  Patent Documents 1 to 3 show a form in which a sealing device that is divided in one place in the circumferential direction is incorporated, but no consideration is given to the sealing performance of the divided portion (divided mating surface). This leaves a lot of room for improvement in sealing performance.

That is, in the case of this type of sealing device, the lip is slidably contacted with the fixed member (for example, the bearing outer ring) with a tightening margin on the outer peripheral surface with the rotation side member (for example, the bearing inner ring). The seal lip that is in sliding contact with the member (bearing outer ring) is subjected to rotational sliding resistance. At that time, the split part (split mating surface) has a side that contracts in the rotational direction and an extended side. ).
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, causing co-rotation, creating gaps on the split mating surface, and causing wear on the seal body, And a gap is formed between the sealing groove and the seal groove.
Therefore, in the prior art, due to the above factors, foreign matter and cooling water enter the bearing through the gap between the split mating surfaces, which causes rust and deteriorates the lubrication state. Was shortened.

  The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a sealing device that is divided in one place in the circumferential direction, ensuring a sealing property at a divided portion during use and a high sealing performance. It is to provide a sealing means with performance.

In order to achieve such an object, the first invention of the present invention is incorporated between a pair of relatively rotating members constituting a rolling bearing unit,
A fixing portion having one divided portion in the circumferential direction and fixed to the one member;
An annular seal body provided with a lip extending from the fixed portion and in sliding contact with the other member;
A sealing device that is provided in a fixing portion of the seal body, and includes an elastic metal ring that presses the fixing portion in a radial direction against the one member;
When the sealing device is fixed to one member, it consists of a splitting portion matching mechanism that keeps the splitting portion of the sealing device in contact ,
Dividing part alignment mechanism
It is composed of at least a pair of fitting convex portions and a pair of fitting concave portions in which the fitting convex portions are fitted,
The pair of fitting projections is a sealing means for the rolling bearing unit, which is provided at a pitch approximate to the pitch of the pair of fitting depressions .

  In a second aspect based on the first aspect, the dividing portion alignment mechanism is provided on the inner diameter surface of the fixing portion of the seal body and on the bottom surface of the seal groove provided on one member to which the fixing portion is attached. This is a sealing means for the rolling bearing unit.

  In a third aspect based on the first aspect, the dividing portion alignment mechanism is provided on both side surfaces of the fixing portion of the seal body and on both side surfaces of the seal groove provided in one member on which the fixing portion is mounted. This is a sealing means for the rolling bearing unit characterized by the above.

In a fourth aspect of the invention according to any one of the first to third aspects, when the short arc pitch length of the pair of fitting convex portions is L1, and the short arc pitch length of the pair of fitting concave portions is L2, This is a sealing means for a rolling bearing unit characterized by having a relationship of L1> L2 .

According to a fifth aspect of the present invention, in any one of the first to third aspects, when a short arc pitch angle of the pair of fitting convex portions is θ1, and a short arc pitch angle of the pair of fitting concave portions is θ2, θ1> It is a sealing means for a rolling bearing unit characterized by having a relation of θ2 .

According to a sixth invention, in any one of the first to fifth inventions, the pair of members is
It is a sealing means for a rolling bearing unit, characterized in that it is an inner ring incorporated in the small-diameter neck of the roll and a housing incorporated in the radially outer side of the inner ring or an outer ring incorporated in the radially outer side of the inner ring .

A seventh invention is a rolling bearing unit comprising the sealing means according to any one of the first to sixth inventions .

  According to the present invention, for example, in a bearing sealing device incorporated in a roll used in a continuous casting facility or the like, the contact state of the divided portion can be maintained even when subjected to a large rotational sliding resistance, and a gap is generated in the divided portion. High sealing performance can be provided without any problems. In addition, by adopting the configuration of the present invention, it is possible to prevent the occurrence of gaps in the divided portions and to prevent the occurrence of co-rotation (anti-rotation of the sealing device), and prevent wear of the sealing device, resulting in sealing performance. Can be maintained for a long time.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a best mode for carrying out the invention will be described with reference to the drawings. The present embodiment is merely an example of the present invention, and is not construed as being limited thereto. The design can be changed within the scope of the present invention.

  The inner ring 5, the outer ring 8, the housing 12, and the labyrinth ring 13 in the present embodiment have a split structure that is divided into two parts, and the elastic products (resin annular seal 11, sealing device 14) in the present embodiment. ) Has one divided portion in the circumferential direction, and the specific structure of these halved structures and divided portions is not particularly limited, and any design can be modified within the scope of the present invention.

  The drawings show an example of a rolling bearing unit using the present invention. In the figure, reference numeral 1 denotes a saddle-shaped drive roll of a continuous casting facility, and the diameter r2 of the neck 2 at the center of the roll is smaller than the roll diameter r1. A bearing 4 is incorporated in the small-diameter neck 2 between the housing 12 and an inner diameter 12a.

  The bearing 4 includes an inner ring 5 fitted to the outer diameter 2a of the small-diameter neck 2, an outer ring 8 fitted to the inner diameter 12a of the housing 12, and a plurality of rolling elements incorporated between the inner and outer rings 5 and 8 ( In this embodiment, it is composed of cylindrical rollers 9. In this embodiment, a full roller type split bearing without a cage will be described as an example of implementation, but a bearing with a cage can also be selected. Further, the bearing configuration is not construed as being limited to the configuration of the present embodiment, and other well-known bearing configurations incorporated in this type of roll can be employed within the scope of the present invention.

  An annular labyrinth ring 13 is fitted and fixed to the inner diameter 12 a of the housing 12, and a non-fixed side end portion 13 a of the labyrinth ring 13 is formed in a concave labyrinth groove 3 provided on the end surface of the small-diameter neck 2. A labyrinth seal S3 is formed.

  The inner ring 5 is provided with a raceway 5a in the center of the axial width dimension, and a concave groove-like seal groove (hereinafter referred to as a first seal groove) continuous in the circumferential direction on the inner diameter of the flange portion 6 provided on both sides of the raceway 5a. 7) is formed, and the sealing device 14 is attached to the first seal groove 7.

  Further, in this embodiment, a seal groove (hereinafter also referred to as a second seal groove) that is continuous in the circumferential direction in the outer region with an axial width dimension than the first seal groove 7 at the inner diameter of the flange portion 6 of the inner ring 5. .) 10 is formed, and a resin-made (fluororesin (tetrafluoroethylene resin) or the like) annular seal 11 is attached to the second seal groove 10, and the outer diameter side of the resin-made annular seal 11 is connected to the labyrinth ring. 13 is in sliding contact with an inner diameter 13 (also referred to as an inner diameter sliding surface) 13b.

  In this embodiment, the sealing device 14 is attached to the inner ring 5 and seals between the labyrinth ring 13 as shown in FIG.

  The sealing device 14 includes an annular seal body 15 and an elastic metal ring 18.

The seal body 15 is made of an elastic member such as elastic rubber or heat-resistant elastic rubber, and is desired from an annular fixing portion 16 fitted in the first seal groove 7 of the inner ring 5 and an outer diameter of the fixing portion 16. It is comprised with the lip | rip 17 extended with the same height in the circumferential direction with thickness.
In the present embodiment, the shape of the fixed portion 16 is formed in a substantially rectangular shape in cross-section designed to fit the first seal groove 7, but is not particularly limited to the present embodiment, The first seal groove 7 may be formed narrower than the first seal groove 7, or may be formed in a circular shape in cross section, and the design can be changed within the scope of the present invention.
The seal body 15 may be made of an elastic member, and an elastic member other than rubber can be selected within the scope of the present invention.

Further, the seal body 15 has one divided portion 19 in the circumferential direction.
When the sealing portion 14 is mounted on the inner ring 5, the split portion 19 is maintained in a state where the split portion aligning surfaces 19 a and 19 a are always in contact with each other by a split portion aligning mechanism 20 described later.

According to this embodiment, when the sealing device 14 is mounted, the lip 17 is formed in an inclined shape (hereinafter also referred to as an outer lip) so that the lip tip 17a faces the atmospheric direction (outer bearing direction), and the labyrinth Since the inner diameter sliding surface 13b of the ring 13 and the tightening margin σ are arranged, the sealing performance of the seal is improved. Further, the shape and number of the outer lips 17 that are in contact with each other can be arbitrarily changed.
In the present embodiment, the outer lip 17 having the above-described configuration mainly prevents entry of foreign matter such as cooling water and scale from the outside. However, the configuration of the lip is not limited to the present embodiment, and for example, illustrated. It is also possible to adopt a form in which the lip (inner lip) inclined toward the inner side of the bearing not in contact with the inner diameter 13b of the labyrinth ring in the different direction together with the outer lip 17 of this embodiment is provided. . According to this, it is possible to both prevent the outer lip 17 from entering the foreign matter and prevent the lubricating oil from flowing out of the bearing by the inner lip.

The elastic metal ring 18 is provided in the fixing portion 16 of the seal body 15 and is configured in an annular shape that presses the fixing portion 16 radially against the inner ring 5 side. For example, a garter spring or the like is an example. As mentioned.
In the present embodiment, the garter spring 18 is fitted into a concave groove 16 a provided around the outer diameter of the fixing portion 16 of the seal body 15.

For example, according to the present embodiment, the dividing portion alignment mechanism 20 is provided on the inner surface 16b of the fixing portion 16 of the seal body 15 and the bottom surface 7a of the first seal groove 7 of the inner ring 5 on which the fixing portion 16 is mounted. Yes.
Next, one specific embodiment of the division unit alignment mechanism 20 will be described with reference to the drawings.

  The dividing portion alignment mechanism 20 includes, for example, a pair of fitting convex portions 21 that are provided in the vicinity of the position of the dividing portion 19 and project from the fixed portion inner diameter surface 16b of the seal body 15 with the dividing portion 19 position as a boundary. , 21 and a pair of fitting recesses 22, 22 provided on the bottom surface 7 a of the first seal groove 7 of the inner ring 5 at a pitch approximate to the pitch between the pair of fitting projections 21, 21, It consists of

In the present embodiment, the fitting convex portion 21 is provided in a short projection shape having a substantially rectangular shape in cross section in the axial position of the fixing portion 16 at the center position in the axial direction of the fixing portion 16 on the fixing portion inner diameter surface 16b of the seal body 15; The fixed portion 16 is formed shorter than the axial width dimension.
On the other hand, in the present embodiment, the fitting recess 22 protrudes from the bottom surface 7a of the first seal groove 7 at the center position of the axial width dimension of the bottom surface 7a in the shape of a short protrusion having a substantially rectangular shape in cross section. It is shorter than the axial width dimension of the bottom surface 7 a and is formed in a shape that fits with the fitting protrusion 21.
The fitting convex part 21 and the fitting concave part 22 are not limited as long as both are closely fitted.

The relationship between the pitch between the pair of fitting convex portions 21 and 21 and the pitch between the pair of fitting concave portions 22 and 22 is set as follows, for example.
For example, when the short arc pitch length of the pair of fitting convex portions 21 and 21 is L1, and the short arc pitch length of the pair of fitting concave portions 22 and 22 is L2, the relationship of L1> L2 is satisfied, Alternatively, when the short arc pitch angle of the pair of fitting convex portions 21 and 21 is θ1, and the short arc pitch angle of the pair of fitting concave portions 22 and 22 is θ2, the relationship of θ1> θ2 is satisfied.

  According to the present embodiment, by adopting the inter-pitch configuration of the fitting convex portion 21 and the fitting concave portion 22 as described above, slight elastic deformation is caused by the difference in pitch, so that the mating surfaces 19a, 19a of the dividing portion 19 To generate a compressive force, and the mating surfaces 19a and 19a always receive the compressive force and act in the closing direction, so that there is no gap between the mating surfaces 19a and 19a.

Further, as described above, since the lip 17 has a tight seal σ with the inner diameter sliding surface 13b of the labyrinth ring 13, it receives rotational resistance with the inner diameter sliding surface 13b. On the mating surfaces 19a, 19a of the dividing portion 19, a side that contracts and a side that extends are generated depending on the rotation direction, and act in the direction in which the lip 17 is opened. However, a slight elastic deformation is applied to the mating surfaces 19a and 19a due to the pitch difference between the fitting convex portions 21 and 21 and the mating concave portions 22 and 22 to generate a compressive force. It always receives the compressive force and acts in the closing direction, so that no gap is generated between the mating surfaces 19a, 19a.
Further, even if the lip 17 receives rotational resistance with the inner diameter sliding surface 13 b of the labyrinth ring 13, the fitting of the first seal groove 7 facing the fitting convex portions 21, 21 of the fixed portion inner diameter surface 16 b of the seal body 15 is performed. Since the joint recesses 22 and 22 are fitted and fixed in the circumferential direction, the occurrence of co-rotation is prevented, and the seal body 15 is not worn.
Therefore, since the seal body 15 is not worn, the adhesion with the first seal groove 7 is maintained, and foreign matter and cooling water can be prevented from entering between the seal body 15 and the first seal groove 7, It is possible to prevent the occurrence of rust and deterioration of the lubrication state and extend the life of the bearing.

Further, although not particularly shown, the dividing portion alignment mechanism 20 includes a fitting convex portion provided on both side surfaces 16c and 16c of the fixing portion 16 of the seal body 15 and a first seal groove of the inner ring 5 on which the fixing portion 16 is mounted. 7 can also be configured by fitting recesses provided on both side surfaces 7b, 7b.
That is, the mating surfaces 19a and 19a of the divided portion 19 always receive a compressive force, and the long arc sides of the fitting convex portions 21 and 21 and the fitting concave portions 22 and 22 always generate a tensile force. Although not uniform, as described above, the split portion alignment mechanism 20 is provided on both side surfaces 16c, 16c of the seal body and both side surfaces 7b, 7b of the first seal groove 7, so that the side surface 7b of the first seal groove 7 is provided. , 7b generates a uniform and high stress in the circumferential direction, so that the above phenomenon is alleviated and the lip 17 has a uniform pressure on the inner diameter sliding surface 13b.
Therefore, since no gap is generated, foreign matter and cooling water can be prevented from entering the bearing, and rusting and the lubrication state are not deteriorated, so that the life of the bearing can be extended.

  As described above, in this embodiment, the contact seal S1 between the lip 17 of the sealing device 14 and the labyrinth ring inner diameter 13b, the contact seal S2 between the resin annular seal 11 and the labyrinth ring inner diameter 13b, and the labyrinth seal S3 Since the seal configuration is used in combination, it has high sealing performance.

In this embodiment, the fitting convex portion 21 is provided on the seal main body 15 of the sealing device 14, and the fitting convex portion 21 fits into the first seal groove 7 of the inner ring 5 to which the sealing main body 15 is mounted. Although the division | segmentation part adjustment mechanism 20 is comprised by providing the fitting recessed part 22, the division | segmentation part adjustment mechanism is provided by providing the fitting convex part 21 in the 1st seal groove 7, and providing the fitting recessed part 22 in the seal | sticker main body 15. FIG. Configuring 20 is also within the scope of the present invention.
In the present embodiment, the lip 17 of the sealing device 14 attached and fixed to the inner ring 5 side is slidably contacted with the inner diameter 13b of the labyrinth ring 13 to form the contact seal S1, but the lip 17 is A form in which a contact seal (not shown) is formed by sliding in contact with the inner diameter of the housing 12a or the outer ring 8 can also be adopted and is within the scope of the present invention. Although not shown, the seal body fixing portion 16 of the sealing device 14 is mounted and fixed to the inner diameter of the outer ring 8 or the housing inner diameter 12a, and the lip on the inner diameter side is brought into sliding contact with the outer diameter of the inner ring 5 to form a contact seal. This is also possible within the scope of the present invention, and in this case, a split portion alignment mechanism is provided between the fixing portion 16 of the seal body 15 and the inner diameter of the outer ring 8 or the housing inner diameter 12a.

FIG. 8 shows a second embodiment of the present invention.
In the present embodiment, an example is shown in which the dividing portion aligning mechanism 20 is configured by providing more than one pair of fitting convex portions 21 and fitting concave portions 22 (not shown for fitting concave portions). Further, the number of the fitting convex portions 21 and the fitting concave portions 22 is not limited to the present embodiment, and the design can be arbitrarily changed. In addition, a present Example is only different from Example 1 in the point which provided more numbers of the fitting convex parts 21 and the fitting recessed parts 22 from Example 1, and another structure and effect are the same as Example 1. FIG. The description is incorporated and the description here is omitted.

  For example, according to the present embodiment, the sealing device 14 includes the pair of fitting convex portions 21 and 21 protruding from the fixing portion 16 of the seal body 15 in the first embodiment, respectively, from the dividing portion 19 in the circumferential direction. The projections 21a and 21a are projected one by one at positions 90 degrees apart from each other, and one fitting projection 21b is projected at a position 180 degrees away from the dividing section 19, for a total of five. The fitting convex part is projected. Accordingly, although not particularly illustrated, the five fitting convex portions 21, 21, 21a, 21a, 21b are also provided in the first seal groove 7 of the inner ring 5 in which the seal body fixing portion 16 of the sealing device 14 is mounted. It is assumed that five fitting concave portions into which the respective fitting convex portions 21, 21, 21a, 21a, and 21b are fitted are provided in corresponding positions.

  In the case of the present embodiment, the pitch configurations of the fitting recesses (not shown) corresponding to the fitting protrusions 21, 21, 21a, 21a, 21b are respectively the fitting protrusions 21, 21, 21a, 21a, 21b and a fitting recess (not shown) give a slight elastic deformation to the mating surfaces to generate a compressive force, and the mating surfaces 19a and 19a always receive the compressive force and act in a closing direction. It is assumed that a gap is not generated between 19a and 19a.

FIG. 9 shows a third embodiment of the present invention.
The present embodiment is an embodiment in which a sealing means similar to that described in the first embodiment is adopted for a self-aligning roller bearing 23 using convex rollers (roller rollers) 24 as rolling elements.
In this embodiment, the bearing type is only different from that of the first embodiment, and the sealing means consisting of the sealing device 14 and the splitting portion matching mechanism 20 which are the main components of the present invention, and other configurations and effects are as follows. Since the same structure and the same operation effect as Example 1 are produced, the same numerals are given to the same location and the explanation is omitted. Further, the basic configuration of the self-aligning roller bearing 23 other than the sealing means is not limited to this embodiment, and other known configurations can be employed within the scope of the present invention.

1 is a schematic sectional view showing Example 1 of the present invention. The front view which shows one Example of a sealing device. III-III sectional view taken on the line of FIG. The partial enlarged front view of a sealing device. The partial expanded sectional view which shows the 1st seal groove of an inner ring | wheel. The partial expanded sectional view of the state which has arrange | positioned the sealing device between the 1st seal groove and the labyrinth ring. The schematic sectional drawing which shows the lip press-contact state of a sealing device. The front view which shows the sealing device of Example 2. FIG. FIG. 6 is a schematic sectional view showing a self-aligning roller bearing of Example 3.

Explanation of symbols

1 Roll 2 Neck 4, 23 Bearing 5 Inner ring 7 First seal groove 8 Outer ring 14 Sealing device 15 Seal body 16 Fixing part 17 Lip 18 Elastic metal ring 19 Dividing part 19a Fitting surface 20 Dividing part fitting mechanism 21 Fitting convex part 22 Fitting Joint recess

Claims (7)

Assembled between a pair of relatively rotating members constituting a rolling bearing unit,
A fixing portion having one divided portion in the circumferential direction and fixed to the one member;
An annular seal body provided with a lip extending from the fixed portion and in sliding contact with the other member;
A sealing device that is provided in a fixing portion of the seal body, and includes an elastic metal ring that presses the fixing portion in a radial direction against the one member;
When the sealing device is fixed to one member, it consists of a splitting portion matching mechanism that keeps the splitting portion of the sealing device in contact ,
Dividing part alignment mechanism
It is composed of at least a pair of fitting convex portions and a pair of fitting concave portions in which the fitting convex portions are fitted,
The pair of fitting convex portions are provided at a pitch approximate to the pitch of the pair of fitting concave portions, and sealing means for a rolling bearing unit, Dividing part alignment mechanism
2. The rolling bearing unit sealing means according to claim 1, wherein the sealing means is provided on an inner diameter surface of a fixing portion of the seal body and a bottom surface of a seal groove provided in one member to which the fixing portion is mounted. Dividing part alignment mechanism
2. The rolling bearing unit according to claim 1, wherein the seal member is provided on both side surfaces of the fixing portion of the seal body and on both side surfaces of a seal groove provided in one member on which the fixing portion is mounted. means. The short arc pitch length of the pair of fitting convex portions is L1,
When the short arc pitch length of the pair of fitting recesses is L2,
It has a relationship of L1> L2.
The rolling means unit sealing means according to any one of claims 1 to 3, wherein the sealing means is a rolling bearing unit. The short arc pitch angle of the pair of fitting projections is θ1,
When the short arc pitch angle of the pair of fitting recesses is θ2,
It has a relationship of θ1> θ2.
The rolling means unit sealing means according to any one of claims 1 to 3, wherein the sealing means is a rolling bearing unit. A pair of members
An inner ring built into the small diameter neck of the roll;
The rolling bearing unit sealing means according to any one of claims 1 to 5, wherein the sealing means is a housing incorporated radially outside the inner ring or an outer ring incorporated radially outside the inner ring . A rolling bearing unit comprising the sealing means according to any one of claims 1 to 6.

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