JP2010190327A - Sealing device and rolling bearing device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device capable of suppressing degradation of sealability caused by foreign matter and a rolling bearing device using the same. <P>SOLUTION: This sealing device 10 includes an annular core metal 11 fixed to an outer ring 2, an annular slinger 12 fixed to an inner ring 3, and a seal lip 13b projected from the axial inner end face 11a of the core metal 11 and forming a sealed space N between a rotating ring and a fixed ring by coming in sliding contact with the slinger 12. A plurality of blades 14 are provided projecting from the axial inner end face 11a of the core metal 11 on the radially inner side of the seal lip 13b which is on the sealed space N side in the circumferential direction for generating airflow toward a radially outward direction by rotating along with the core metal 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sealing device used in, for example, a rolling bearing device for supporting a roll of a rolling mill, and a rolling bearing device using the same.

For example, a rolling bearing device for supporting a roll neck of a roll for a rolling mill includes a sealing device to prevent foreign matters and moisture from entering the bearing device.
As shown in FIG. 5, the conventional sealing device used for the rolling bearing device is fixed to an annular core metal 102 fixed to an inner ring 101 that is a rotating wheel and an outer ring 103 that is a fixed ring, and to a core metal. 102 between the inner ring 101 and the outer ring 103 by projecting from an end surface on one side in the axial direction of the cored bar 102 and being in sliding contact with the end surface of the slinger 104. And an annular seal lip 105 that forms a sealed space (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 55-20944

In the conventional sealing device, when foreign matter or the like enters from between the core metal 102 and the inner peripheral surface of the outer ring 103, the foreign matter is accumulated radially outward of the seal lip 105. For this reason, the accumulated foreign matter stays in the vicinity of the seal lip 105, and there is a problem that it easily enters the sealed space side through the seal lip 105.
When foreign matter or the like passes through the seal lip 105 and enters the sealed space of the rolling bearing device, the lubricity of the rolling bearing device is lowered, which causes a decrease in durability of the rolling bearing device.
The present invention has been made in view of such circumstances, and even if foreign matter or the like accumulates in the vicinity of the seal lip, the foreign matter or the like can be prevented from passing through the seal lip and entering the sealed space. It is an object of the present invention to provide a sealing device and a rolling bearing device using the same.

  In order to achieve the above object, the present invention provides an annular cored bar fixed to a rotating wheel and a fixed ring arranged concentrically with the rotating wheel and at one side in the axial direction with respect to the cored bar. An annular slinger arranged oppositely, and an annular slender projecting from one end surface in the axial direction of the core metal and slidingly contacting the end surface of the slinger, thereby forming a sealed space between the rotating wheel and the fixed wheel A sealing lip, wherein a radially inner side of the sealing lip is on the sealed space side, and a radially inner side of the sealing lip on the sealed space side extends along the radial direction. A plurality of blade portions are provided along the circumferential direction that project from the one end surface of the core bar and rotate together with the core bar to generate a radially outward air flow. It is said.

  According to the sealing device configured as described above, a plurality of blade portions extending along the radial direction are provided along the circumferential direction on the axial one side end surface of the core metal fixed to the rotating wheel. When the metal core rotates together with the rotating wheel, the plurality of blade portions rotate along the circumferential direction. Thereby, a blade | wing part can produce the flow of the air which goes to radial direction outward toward a seal lip from the sealed space side, and can prevent that a foreign material passes a seal lip toward the sealed space side. As a result, even if foreign matter or the like is accumulated near the radially outer side of the seal lip, the foreign matter or the like can be prevented from entering the sealed space inside the seal lip in the radial direction.

A sliding contact portion that is in sliding contact with the end surface of the slinger is formed radially outward on one end surface in the axial direction of the blade portion, and a separation portion that is separated from the end surface of the slinger is formed on the sliding contact portion. It is preferable that it is formed inside in the radial direction.
In this case, since the blade portion rotates while sliding only the sliding contact portion formed at the radially outer end portion on the end surface of the slinger, the vicinity of the blade portion radially outward is rotated by the frictional force with the slinger. Is deformed so as to swing and tilt in the opposite direction. Thereby, the blade | wing part can produce the flow of the air to radial direction outward efficiently, and can prevent effectively a foreign material passing a seal lip toward the sealed space side.

Moreover, it is preferable that the said blade | wing part becomes thin as it goes to radial direction outer side.
In this case, since the thickness on the radially outer side of the blade portion is thinner than that on the radially inner side, the radially outer side of the blade portion is easily deformed. For this reason, when a blade | wing part rotates, making the axial direction end surface slidably contact with the end surface of a slinger, the deformation | transformation near the radial direction outer side of the said blade | wing part becomes easy. As a result, the blade portion can more efficiently generate the air flow radially outward, and more effectively prevent foreign matter from passing through the seal lip toward the sealed space side. .

In the sealing device, the blade portion includes a base portion fixed to one end surface in the axial direction of the cored bar, and a tip portion that can swing in a circumferential direction by protruding from a radially outer tip of the base portion. , May be provided.
In this case, since the tip portion can swing in the radial direction, the tip portion can be swung in the opposite direction to the rotation direction and tilted by the rotation of the blade portion. Thereby, the blade | wing part can produce the flow of the air to radial direction outward efficiently, and can prevent more effectively that a foreign material passes a seal lip toward the sealed space side.

In addition, the present invention provides a rotating wheel, a fixed wheel, a plurality of rolling elements disposed between the rotating wheel and the fixed wheel, and a sealing that forms a sealed space between the rotating wheel and the fixed wheel. A rolling bearing device including the device, wherein the sealing device is the above-described sealing device.
According to the rolling bearing device having the above-described configuration, as described above, even if foreign matter or the like accumulates in the vicinity of the radially outer side of the seal lip, the foreign matter or the like enters the sealed space radially inward of the seal lip. Can be prevented.

  According to the sealing device of the present invention and the rolling bearing device using the same, even if foreign matter accumulates in the vicinity of the seal lip, the foreign matter or the like can be prevented from passing through the seal lip and entering the sealed space. it can.

It is sectional drawing which shows the structure of the rolling bearing apparatus for supporting the roll neck of the roll for rolling mills based on one Embodiment of this invention. It is the fragmentary sectional view which expanded the sealing device in FIG. It is an external view when the core metal to which the sealing member is fixed is viewed from the front. It is sectional drawing which shows the structure of the rolling bearing apparatus of another aspect. It is sectional drawing which shows the conventional sealing device.

Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view illustrating a configuration of a rolling bearing device for supporting a roll neck of a roll for a rolling mill according to an embodiment of the present invention.
In FIG. 1, a rolling bearing device 1 is provided on roll necks (not shown) at both ends of a roll for a rolling mill and rotatably supports the roll, and a housing (not shown) provided in the rolling mill. Cone as a plurality of rolling elements disposed between the outer ring 2 and the inner ring 3 such that the outer ring 2 is fitted and fixed to the inner ring 3, the inner ring 3 concentrically disposed on the inner peripheral side of the outer ring 2, and the outer ring 2 and the inner ring 3. A roller 4, an annular cage 5 for holding the plurality of tapered rollers 4 in the circumferential direction, and a pair of sealing devices 10 that form an annular sealed space between the outer ring 2 and the inner ring 3. ing.

  The inner ring 3 is configured by combining a pair of cylindrical inner ring members 3a in the axial direction. A pair of inner ring raceway surfaces 3a1 on which a plurality of tapered rollers 4 roll are formed on the outer circumferential surface of the inner ring member 3a. The roll neck is inserted and fixed on the inner peripheral surface side of the inner ring 3.

The outer ring 2 includes a cylindrical first outer ring member 2a disposed in the center of the rolling bearing device 1 and a pair of cylindrical second outer ring members 2b disposed at both ends of the first outer ring member 2a in the axial direction. It is configured in combination.
On the inner peripheral surface of the first outer ring member 2a, a pair of outer ring raceway surfaces 2a1 on which a plurality of cylindrical rollers roll are formed opposite to the inner ring raceway surface 3a1 formed on the inner side in the axial direction of each of the pair of inner ring members 3a. Has been. Further, on the inner peripheral surface of the pair of second outer ring members 2b, an outer ring raceway surface 2b1 on which a plurality of cylindrical rollers roll is opposed to the inner ring raceway surface 3a1 formed on the outer side in the axial direction of each of the pair of inner ring members 3a. Is formed.

  The plurality of tapered rollers 4 are arranged so as to roll between the inner ring raceway surface 3a1 and the outer ring raceway surfaces 2a1, 2b1, and constitute a tapered roller bearing in which the plurality of tapered rollers are arranged in four rows.

  The pair of sealing devices 10 are fixed so as to block the annular openings at both ends of the outer ring 2 and the inner ring 3. The sealing device 10 will be described in detail later.

In the rolling bearing device 1 configured as described above, the outer ring 2 and the inner ring 3 are relatively rotatable, the outer ring 2 is fitted and fixed in the housing of the rolling mill, and the rolling mill roll is formed on the inner peripheral surface of the inner ring 3. By inserting and fixing the roll neck, the roll for the rolling mill is rotatably supported.
Further, as described above, the outer ring 2 is a fixed ring that is fitted and fixed to the housing of the rolling mill, and the inner ring 3 is a rotating ring that rotates integrally with the housing of the rolling mill.

  FIG. 2 is an enlarged partial sectional view of the sealing device in FIG. In the figure, the sealing device 10 includes an annular core 11 fixed to the inner ring 3, an annular slinger 12 fixed to the second outer ring member 2 b (outer ring 2) and disposed opposite to the core 11. And a seal member 13 fixed to the core metal 11.

The slinger 12 has a cylindrical portion 12a that is fitted and fixed to the outer end portion of the inner peripheral surface of the second outer ring member 2b, and a flange portion 12b that is formed at the inner end portion of the cylindrical portion 12a.
The metal core 11 is disposed opposite to the slinger 12 on the outer side in the axial direction, which is the end of the inner ring 3, and a retaining ring 15 fitted in a circumferential groove 3c formed on the outer circumferential surface of the inner ring 3, and an inner ring The inner peripheral edge is sandwiched between the stepped portion 3d formed on the outer peripheral surface of the third step. Thus, the core metal 11 is fixed to the outer peripheral surface of the inner ring 3 so as to be integrally rotatable.

The seal member 13 is a member formed and fixed to the core metal 11 by vulcanization adhesion using an elastic body such as nitrile rubber, and includes a base portion 13a along the inner end surface 11a facing the axial inner side of the core metal 11, and a core metal 11 has an annular seal lip 13b projecting from the inner end surface 11a of the flange portion 12b and in sliding contact with the outer end surface 12b1 of the flange portion 12b.
The base 13 a is formed so as to cover the inner peripheral surface of the core 11 from the inner end surface 11 a of the core 11, and the base 13 a is between the inner peripheral edge of the core 11 and the step 3 d of the inner ring 3. It seals between the inner ring 3 and the inner peripheral edge of the cored bar 11.
The seal lip 13b extends radially outward from the inner end surface 11a of the cored bar 11 toward the axial slinger 12 side. The tip of the seal lip 13b is in sliding contact with the outer end surface 12b1 of the flange portion 12b and seals between the inner ring 3 and the inner peripheral edge of the core metal 11, so that an annular sealed space is formed between the outer ring 2 and the inner ring 3. N is formed. Further, the seal lip 13b is provided such that a radially inner side of the seal lip 13b is a sealed space N and a radially outer side is an outer space G that is on the outer side with respect to the sealed space N.

  The seal member 13 has a blade portion 14 that protrudes from the inner end surface 11 a of the core metal 11. A plurality of blade portions 14 are formed along the circumferential direction so as to be located radially inward of the seal lip 13b on the sealed space N side.

  FIG. 3 is an external view of the cored bar to which the seal member is fixed when viewed from the front. 2 and 3, the blade portion 14 is a member formed in a plate shape so as to extend along the radial direction, and rotates with the core metal 11 integrally fixed to the inner ring 3. It is formed so as to generate a flow of air that goes outward in the direction.

  According to the sealing device 10 configured as described above, a plurality of blade portions 14 extending along the radial direction are provided along the circumferential direction on the axially inner end surface 11a of the core metal 11 fixed to the inner ring 3. Therefore, when the core 11 rotates together with the inner ring 3, the plurality of blade portions 14 rotate along the circumferential direction. Thereby, the blade | wing part 14 produces the flow of the air which goes to radial direction toward the seal lip 13b from the sealed space N side, and prevents a foreign material from passing the seal lip 13b toward the sealed space N side. can do. As a result, even if foreign matter or the like accumulates in the vicinity of the radially outer side of the seal lip 13b, the foreign matter or the like can be prevented from entering the sealed space N radially inward of the seal lip 13b.

Further, a sliding contact portion 14c that is in sliding contact with the outer end surface 12b1 of the flange portion 12b is formed on the radially inner end surface of the blade portion 14 on the inner end surface in the axial direction of the blade portion 14, and the sliding contact portion 14c. A spacing portion 14d is formed on the radially inner side of the sliding contact portion 14c by being inclined radially outward from the flange portion 12b.
In this case, since the blade portion 14 rotates while sliding the sliding contact portion 14c formed at the radially outer end portion on the outer end surface 12b1 of the flange portion 12b, the vicinity of the radially outer side of the blade portion 14 is in sliding contact. Due to the frictional force between the portion 14c and the flange portion 12b, it is deformed so as to swing and incline in the opposite direction to the rotational direction (see the broken line in FIG. 3). Thereby, the blade | wing part 14 can produce the flow of the air to radial direction outward efficiently, and can effectively prevent that a foreign material passes the seal lip 13b toward the sealed space N side. it can.

In the rolling mill, since the work is reciprocated with respect to the work roll or the like and rolled, the inner ring 3 does not rotate only in one direction but stops in one direction and stops in the other direction. Repeatedly rotate.
On the other hand, in the present embodiment, by providing the sliding contact portion 14c on the blade portion 14, even if the inner ring 3 rotates in any direction, the radially outer vicinity of the blade portion 14 is in the rotational direction. Thus, the blade portion 14 can be deformed so as to swing and incline in the opposite direction, and the air flow can be efficiently generated outward in the radial direction regardless of the rotation direction of the inner ring 3.

Moreover, the blade | wing part 14 is formed so that thickness may become thin as it goes to radial direction outer side, as shown in FIG.
In this case, since the thickness on the radially outer side of the blade portion 14 is thinner than that on the radially inner side, the radially outer side of the blade portion 14 is easily deformed. For this reason, when the blade | wing part 14 rotates, making the slidable contact part 14c slidably contact with the flange part 12b, the deformation | transformation of the radial direction outer side vicinity of the said wing | blade part 14 becomes easy. As a result, the blade portion 14 can more efficiently generate a radially outward air flow, and more effectively prevent foreign matter from passing through the seal lip toward the sealed space. it can.

  Moreover, in this embodiment, the blade | wing part 14 has the base 14a fixed to the inner side end surface 11a of the metal core 11, and the front-end | tip part 14b protruded from the radial direction front-end | tip of this base 14a. Since the seal member 13 is formed using an elastic body as described above, the tip portion 14b protruding in the radial direction from the base portion 14a can be deformed so as to swing in the circumferential direction.

  In this case, when the blade portion 14 rotates, the tip end portion 14b can be deformed so as to swing and tilt in a direction opposite to the rotation direction. In particular, as in the present embodiment, when the sliding contact portion 14c is provided at the radially outer end portion of the axially inner end face of the blade portion 14, the tip end is caused by the frictional force between the sliding contact portion 14c and the flange portion 12b. The portion 14b can be reliably deformed so as to be inclined in the opposite direction with respect to the rotation direction. Thereby, the blade | wing part 14 can produce the air flow to radial direction outward efficiently, and can prevent more effectively that a foreign material passes a seal lip toward the sealed space side. .

The present invention is not limited to the above embodiments. In the said embodiment, although the blade | wing part 14 was formed in the plate shape extended along radial direction, if it is a shape which produces the flow of the air which goes to radial direction outward by rotating with the core metal 11, it will be in this It is not limited.
In the above embodiment, the inner ring 3 is a rotating wheel and the outer ring 2 is a fixed ring. However, in the case where the inner ring 3 is a fixed ring, as shown in FIG. The core bar 11 protruding from the end face is fixed to the inner peripheral surface of the outer ring 2, and the slinger 12 is arranged on the outer side in the axial direction of the core bar 11, so that the radially inner side of the seal lip 13 b becomes the sealed space N. As described above, the sealing lip 13b can form the sealed space N. Even in this case, the blade portion 14 formed radially inward of the seal lip 13b rotates together with the outer ring 2 that is a rotating wheel to generate an air flow, and foreign matter or the like is generated in the radial direction of the seal lip 13b. Intrusion into the sealed space N can be prevented.

DESCRIPTION OF SYMBOLS 1 Rolling bearing apparatus 2 Outer ring 3 Inner ring 4 Cylindrical roller 10 Sealing device 11 Core metal 12 Slinger 13b Seal lip 14 Blade part 14a Base part 14b Tip part 14c Sliding part 14d Spacing part G External space N Sealing space

Claims (5)

An annular cored bar fixed to the rotating wheel;
An annular slinger that is fixed to a fixed wheel that is concentrically disposed with the rotating wheel and that is disposed opposite to the one side in the axial direction with respect to the core metal,
An annular seal lip that protrudes from one end surface in the axial direction of the metal core and slides into contact with the end surface of the slinger to form a sealed space between the rotating wheel and the fixed wheel;
In the sealing device in which the radially inner side of the seal lip is the sealed space side,
The seal lip on the sealed space side is radially inwardly projecting from the one end face of the core bar so as to extend along the radial direction, and rotating together with the core bar to the radially outer side. A sealing device characterized in that a plurality of blade portions that cause a flow of air to flow are provided along a circumferential direction.   A sliding contact portion that is in sliding contact with the end surface of the slinger is formed radially outward on one end surface in the axial direction of the blade portion, and a separation portion that is separated from the end surface of the slinger is formed on the sliding contact portion. The sealing device according to claim 1, wherein the sealing device is formed on a radially inner side.   The sealing device according to claim 2, wherein the blade portion has a thickness that decreases toward a radially outer side.   The blade portion includes a base portion fixed to one end surface in the axial direction of the cored bar, and a tip portion that can swing in the circumferential direction by protruding from a radially outer tip of the base portion. The sealing device as described in any one of Claims 1-3. A rotating wheel,
A fixed ring,
A plurality of rolling elements disposed between the rotating wheel and the fixed wheel;
In a rolling bearing device comprising a sealing device that forms a sealed space between the rotating wheel and the fixed wheel,
A rolling bearing device, wherein the sealing device is the sealing device according to any one of claims 1 to 4.

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