JP6657899B2 - Sealed structure - Google Patents

Description

  The present invention relates to a sealing structure, and more particularly to a sealing structure used in a hub bearing of a vehicle or the like.

  In a vehicle, for example, an automobile, a hub bearing that rotatably supports wheels is in an environment that is directly exposed to foreign substances such as rainwater, muddy water, and dust. For this reason, conventionally, a sealing device is attached to the hub bearing in order to seal the inside of the hub bearing. This sealing device seals the lubricant inside the hub bearing and prevents foreign substances from entering the inside.

  In addition, a sealing device used for a hub bearing is required to prevent foreign matter from entering the inside of the hub bearing and not to increase torque resistance applied to the hub bearing by the sealing device.

  FIG. 8 is a partial cross-sectional view showing a schematic configuration of a sealing device (hereinafter, also referred to as a hub seal) attached to a conventional hub bearing. As shown in FIG. 8, a sealing device 100 as a conventional hub seal includes an outer ring in a hub bearing 200 in order to seal an annular space 203 between an outer ring 201 and a hub wheel 202 which rotate relatively coaxially with each other. It is fitted between 201 and the hub wheel 202. The sealing device 100 suppresses the leakage of the lubricant of the bearing balls 204 existing in the space 203 and the intrusion of foreign matter into the space 203.

  As shown in FIG. 8, the sealing device 100 is made of a metal reinforcing ring 111 fitted inside the inner peripheral surface of the outer ring 201 of the hub bearing 200, and a rubber material integrally formed so as to cover the reinforcing ring 111. And an elastic body portion 112.

  In the sealing device 100, the elastic portion 112 has side lips 115 and 116 and a radial lip 117, and the side lips 115 and 116 and the radial lip 117 are in sliding contact with the curved peripheral surface 202 a of the hub wheel 202. I have. The side lips 115 and 116 mainly prevent foreign substances from entering the space 203 of the hub bearing 200, and the radial lip 117 mainly suppresses leakage of lubricant of the bearing balls 204 existing in the space 203. ing.

JP 2008-298106 A

  In the conventional sealing device 100 as shown in FIG. 8, prevention of foreign substances is mainly prevented by the side lips 115 and 116, and leakage of the lubricant is mainly prevented by the radial lip 117. However, with the diversification of the use environment of the vehicle, prevention of intrusion of foreign matters in more severe use environment is required, for example, it is necessary to cope with intrusion of the muddy water 65 from the outer peripheral side of the sealing device 100. For this reason, the conventional sealing device 100 is required to have improved performance of preventing foreign matter from entering. On the other hand, in order to improve the performance of preventing foreign matter from entering, it is conceivable to increase the number of side lips 115 and 116 that are in sliding contact with the outer peripheral surface (curved peripheral surface) 202a of the hub wheel 202 as in the related art. , 116 increases the torque resistance of hub bearing 200. For this reason, it is required to improve the performance of preventing foreign matter from entering by a sealing structure including a sealing device and a structure around the sealing device.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a sealing structure that can improve a function of preventing foreign matter from entering while avoiding an increase in torque resistance that occurs. .

  In order to achieve the above object, a sealing structure according to the present invention comprises an annular outer peripheral member rotatable relative to each other about an axis in a bearing, and an annular inner peripheral member at least partially surrounded by the outer peripheral member. A sealing device attached to the outer peripheral member, an annular groove formed in the outer peripheral member that is depressed inward, and attached to the inner peripheral member. An annular slinger about the axis, wherein the sealing device is provided with an annular reinforcing ring about the axis, and the axis formed of an elastic body attached to the reinforcing ring. An annular elastic body portion, wherein the elastic body portion includes at least one side lip abutting on the slinger from the inside and a radial lip abutting on the slinger from the outer peripheral side. The slinger has a bent portion of the annular protruding toward the inside, the refractive portion of said slinger, characterized in that to form a labyrinth seal to enter the interior of the groove.

  In the sealing structure according to one aspect of the present invention, in a cross section along the axis, an inner peripheral groove surface that is the inner peripheral surface of the groove has a diameter that decreases at least in part toward the inside. are doing.

  In the sealing structure according to one aspect of the present invention, in the cross section along the axis, the inner circumferential groove surface partially extends in parallel with the axis, and the portion is formed in the groove portion in the bearing. , In the vertical direction.

  In the sealing structure according to one embodiment of the present invention, in a cross section along the axis, an outer peripheral groove surface that is the outer peripheral surface of the groove portion is at least partially expanded in diameter toward the inside. I have.

  In the sealing structure according to one embodiment of the present invention, in a cross section along the axis, the outer peripheral side groove surface partially extends in parallel with the axis, and the part extends vertically in a groove portion in the bearing. Is located at the bottom.

  In the sealing structure according to one aspect of the present invention, the bending portion of the slinger is increased in diameter toward the inside.

  In the sealing structure according to one aspect of the present invention, the slinger includes an annular gasket portion that is attached to the inner peripheral side of the bending portion and protrudes outward, and the gasket portion includes the inner gasket portion. It is formed so as to be in contact with the peripheral member.

  ADVANTAGE OF THE INVENTION According to the sealing structure which concerns on this invention, the invasion prevention function of a foreign material can be improved, preventing the increase of the generated torque resistance.

It is a partial sectional view showing the upper half in a section which meets an axis of a sealing structure concerning an embodiment of the invention. FIG. 3 is a cross-sectional view of a hub bearing to which the sealing structure according to the embodiment of the present invention is applied, taken along a line along an axis thereof. It is a fragmentary sectional view showing the lower half in the section which met the axis of the sealing structure concerning an embodiment of the invention. FIG. 4 is a cross-sectional view showing the groove shown in FIG. 3 as viewed from the axial direction, and showing how muddy water and the like are guided in the groove and droop. It is a fragmentary sectional view showing the lower half in the section which met the axis of the modification of the sealing structure concerning an embodiment of the invention. It is a figure which shows the groove part shown in FIG. 5 seen from the axial direction, and is sectional drawing which shows a mode that muddy water etc. are guided in a groove part and droop. It is a partial sectional view showing an upper half in a section which met an axis of a sealing structure concerning other embodiments of the present invention. It is a partial sectional view showing the upper half in the section along the axis which shows the conventional sealing structure.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a schematic configuration of a sealing structure 1 according to an embodiment of the present invention in a cross section along an axis x. FIG. 2 is a diagram to which the sealing structure 1 according to the embodiment of the present invention is applied. FIG. 3 is a cross-sectional view of a cross section of the hub bearing 50 along an axis x. The sealing structure 1 according to the embodiment of the present invention is applied to, for example, a hub bearing 50 that rotatably supports wheels in an automobile.

  As shown in FIG. 2, the hub bearing 50 has an annular outer ring 51 centered on an axis x as an outer peripheral member and an axis x rotatable relative to the outer ring 51 as an inner member. The vehicle includes an annular hub 52 partially surrounded by the outer race 51, and a plurality of bearing balls 53 disposed between the outer race 51 and the hub 52. Specifically, the hub 52 has an inner ring 54 and a hub wheel 55, and a wheel (not shown) is mounted on a wheel mounting flange 56 of the hub wheel 55 by a plurality of hub bolts 57.

  A sealing structure 1 according to an embodiment of the present invention is disposed in a space 5 between the outer ring 51 and the hub wheel 55 so as to seal the space 5 of the hub bearing 50. The sealing structure 1 prevents the lubricant from leaking from the area where the bearing balls 53 and the like of the hub bearing 50 are provided, and also prevents foreign matters such as rainwater, muddy water and dust from entering the area from outside. Is being planned.

  As shown in FIG. 1, a sealing structure 1 according to an embodiment of the present invention is formed in an annular sealing device 10 around an axis x, an annular slinger 20 around an axis x, and an outer ring 51. And an annular groove 30 depressed inward. The slinger 20 is disposed on the hub wheel 55 so as to face the sealing device 10 from outside. Here, for convenience of explanation, as shown in FIG. 1, “outside” is the direction of arrow a in the direction of the axis x, and “inside” is the direction of arrow b in the direction of the axis x. In other words, the outside is the side facing the outside of the hub bearing 50 and the side facing the atmosphere where foreign substances are present. The inside is the side facing the inside of the hub bearing 50 and the side facing the space 5. In a direction perpendicular to the axis x (hereinafter, also referred to as “radial direction”), the direction away from the axis x (the direction of arrow c in FIG. 1) is defined as the outer peripheral side, and the direction approaching the axis x (arrow d in FIG. 1). Direction) is the inner circumferential side.

  The sealing device 10 includes an elastic body portion 11 made of an annular elastic body about the axis x, and an annular metal reinforcing ring 12 about the axis x.

  The elastic body 11 is integrally attached to the reinforcing ring 12. Examples of the elastic body of the elastic body portion 11 include various rubber materials. The rubber material is, for example, a synthetic rubber such as nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), acrylic rubber (ACM), and fluoro rubber (FKM). Examples of the metal material of the reinforcing ring 12 include stainless steel and SPCC (cold rolled steel).

  As shown in FIG. 1, the elastic body portion 11 includes a base portion 14, an outer peripheral side lip 15 extending outward, an inner peripheral side lip 16 extending outward, and a radial extending toward the axis x. And a lip 17. The base portion 14 includes a cylindrical outer peripheral portion 14a located on the outer peripheral side, a disk portion 14b extending radially from the outer end of the outer peripheral portion 14a to the inner peripheral side, and an inner peripheral end of the disk portion 14b. And a disc-shaped portion 14d extending radially inward from the inner peripheral end of the conical annular portion 14c. The outer peripheral side lip 15 is a lip portion extending from the conical ring portion 14 c to the outer peripheral side in the base portion 14, and the inner peripheral side lip 16 is located on the inner peripheral side with respect to the outer peripheral side lip 15. The lip portion extends outwardly and outwardly from the disk portion 14d of the portion 14. The radial lip 17 is a lip portion located on the inner peripheral side with respect to the inner peripheral side lip 16 and extending inward and inward from the disk portion 14 d of the base portion 14. The outer peripheral side portion 14a forms a gasket portion that abuts on the inner peripheral surface 51a of the outer ring 51 to seal between the outer ring 51 and the sealing device 10. The outer peripheral side lip 15, the inner peripheral side lip 16, and the radial lip 17 are all formed in an annular shape about the axis x, and each of the distal ends is in sliding contact with the slinger 20. The inner lip 15 and the inner peripheral side lip 16 mainly prevent foreign substances from entering the space 5 of the hub bearing 50, and the radial lip 17 mainly leaks lubricant existing in the space 5 of the hub bearing 50. Has been suppressed. The elastic body portion 11 may have only one side lip extending outward.

  The reinforcing ring 12 is formed in an annular shape around the axis x, and as shown in FIG. 1, a cylindrical cylindrical portion 12a located on the outer peripheral side, and a disk-shaped disk portion extending from the cylindrical portion 12a to the inner peripheral side. 12b, a conical annular ring portion 12c extending inward and inward from the inner peripheral end of the disk portion 12b, and a reinforcing ring 12 extending radially inward from the inner end of the conical annular portion 12c to the inner peripheral side. And a disk part 12d reaching the inner peripheral end of the disk. In the cylindrical portion 12a of the reinforcing ring 12, the reinforcing ring 12 is fitted on the inner peripheral side of the outer ring 51, whereby the sealing device 10 is held by the outer ring 51.

  The elastic body 11 is attached to the reinforcing ring 12 from the inner peripheral side and the outer side, and the elastic body 11 is reinforced. Specifically, the outer peripheral side portion 14a of the elastic body portion 11 is attached to the cylindrical portion 12a of the reinforcing ring 12, and the disk portion 14b of the elastic body portion 11 is attached to the disk portion 12b of the reinforcing ring 12. In addition, the conical ring portion 14c of the elastic body portion 11 is attached to the conical ring portion 12c of the reinforcing ring 12, and the disc portion 14d of the elastic body portion 11 is attached to the disc portion 12d of the reinforcing ring 12. The shape of the reinforcing ring 12 extending inward from the cylindrical portion 12a is not limited to the above-described disk portion 12b, cone ring portion 12c, and disk portion 12d, but may be another shape. Further, along with the shape of the reinforcing ring 12, the shape of the base portion 14 of the elastic body portion 11 may have a shape different from the above-described shape.

  The reinforcing ring 12 is manufactured by, for example, press working or forging, and the elastic body portion 11 is formed by crosslinking (vulcanization) molding using a molding die. At the time of this cross-linking molding, the reinforcing ring 12 is arranged in a molding die, the elastic body portion 11 is bonded to the reinforcing ring 12 by cross-linking adhesion, and the elastic body portion 11 is formed integrally with the reinforcing ring 12. You.

  The slinger 20 is a member made of metal, for example, stainless steel having excellent rust resistance, and is a plate-shaped annular member centered on the axis x. The slinger 20 has an annular bending portion 20e, which will be described later, protruding inward. The bending portion 20e enters the groove 30 in the hub bearing 50 in a non-contact manner to form a labyrinth seal. ing. The slinger 20 is fitted to a cylindrical surface 55 b which is an outer peripheral surface of a cylindrical shoulder portion to which the wheel mounting flange 56 of the hub wheel 55 is integrally joined. Has a shape along the curved peripheral surface 55a near the inner peripheral end (near the base). The curved surface 55a is, for example, a hyperbolic curved surface. Specifically, the slinger 20 has a cylindrical portion 20a centered on an axis x formed along the cylindrical portion 55b, and an axis x formed on a curved surface 55a. An annular curved surface portion 20b, an annular disk portion 20c centered on a disk-shaped axis x extending outward from an outer peripheral end of the curved surface portion 20b, and an inner peripheral side from an outer peripheral end 20g of the disk portion 20c. And an annular refraction portion 20e centered on the axis x that refracts toward and enters the groove portion 30 formed in the outer ring 51. The slinger 20 has a cylindrical surface 20 a fitted to the cylindrical surface 55 b at the shoulder of the hub wheel 55.

  Specifically, the bending portion 20e extends obliquely inward from the outer peripheral end 20g of the disk portion 20c toward the outer peripheral side. To form a gap g, which is a gap having a very small width, between itself and the groove 30. The gap g forms a labyrinth seal, and suppresses foreign matter from entering the sealing device 10 through the gap g.

  Next, the shape of the groove 30 will be described with reference to FIGS. 1, 3, and 4. FIG.

  As described above, the groove 30 is formed to have a substantially rectangular concave shape in a cross section along the axis x, and more specifically, the groove 30 has a radial size (width) of the groove 30. The groove 30 is formed so as to expand toward both the outer peripheral side and the inner peripheral side as the groove 30 enters from the outside to the inside.

  As shown in FIG. 1, the groove portion 30 has an outer peripheral groove surface 31 that is an outer peripheral surface, an inner peripheral groove surface 32 that is an inner peripheral surface, and a bottom surface 33 that is an inner disk surface. I have. Specifically, as shown in FIG. 1, in a cross section along the axis x, the outer circumferential groove surface 31 which is the outer circumferential surface (the direction of the arrow c) of the groove 30 is inclined with respect to the axis x, The inner peripheral groove surface 32, which is a surface on the inner peripheral side (in the direction of arrow d) of the groove 30, is inclined with respect to the axis x. The diameter is reduced toward the inside.

  The cross-sectional shape of the groove portion 30 along the axis x is not uniform, and as described later, the cross-sectional shape of the lowermost portion in the vertical direction along the axis x in the use state of the hub bearing 50 is different from other portions. You may. FIG. 3 is a partial cross-sectional view showing a lower half in a cross section along the axis x of the sealing structure 1 according to the embodiment of the present invention, and shows a sealing in a cross section along the axis x viewed in the direction of arrow B in FIG. FIG. 2 is a partial cross-sectional view showing a lower half of a structure 1. FIG. 4 is a view showing the entire groove 30 when the hub bearing 50 is used, as viewed in the direction of the axis x. In FIG. 4, the vertical direction indicates the vertical direction, the arrow z1 indicates the direction of gravity, and the arrow z2 indicates the anti-gravity direction.

  FIG. 3 shows the lowermost portion 30a (see FIG. 4) of the groove 30 located at the lowest position in the direction of gravity when the hub bearing 50 is used. In the lowermost portion 30a of the groove 30, in the cross section along the axis x, the outermost lowermost surface 31a which is the outermost groove surface 31 in the lowermost portion 30a is formed parallel to the axis x. In the present embodiment, the innermost lowermost surface 32a, which is the innermost groove surface 32 in the lowermost portion 30a, is also formed in parallel to the axis x similarly to the outermost lowermost surface 31a. Thereby, the groove 30 can be formed with one tool, and the processing of the groove 30 can be facilitated.

  Also, as shown in FIGS. 5 and 6, in the groove portion 30, only the outermost lowermost surface 31 a of the outer peripheral groove surface 31 may extend parallel to the axis x at the lowermost portion 30 a. Also in this case, the groove 30 can be formed with one tool, and the processing of the groove 30 can be facilitated.

  Next, the operation of the groove 30 will be described.

  In the groove 30, the refracting portion 20e of the slinger 20 enters to form a small annular gap g to form a labyrinth seal, and rainwater, muddy water, and the like that enter from the outer peripheral side of the sealing structure 1 are formed. Foreign matter such as dust is suppressed from entering the sealing device 10 through the gap g. In addition, as shown in FIG. 1, in the cross section along the axis x, the groove portion 30 is formed such that the outer peripheral groove surface 31 is increased in diameter toward the inside and is inclined toward the outer peripheral side, and the inner peripheral groove surface is formed. 32 is reduced in diameter toward the inside, and is formed to be inclined toward the inner peripheral side. Therefore, even if foreign matter enters the groove 30 from the outer peripheral side of the sealing structure 1, the foreign matter that has entered the inner peripheral groove surface 32 and the bottom surface above the groove 30 (in the direction of the arrow z <b> 2 in FIG. 4). 33, and is stored in a recess 30b (see FIG. 1) which is a recess formed by the outer peripheral groove surface 31 and the bottom surface 33 below the groove 30 (in the direction of the arrow z1 in FIG. 4). It is stored in the depression 30c (see FIG. 1) which is a depression to be formed. In FIGS. 3 and 4, as indicated by an arrow m, the foreign matter stored in the recesses 30 b and 30 c of the groove 30 does not enter the sealing device 10 through the gap g and acts on gravity. In response, it falls to the lowermost portion 30a of the groove 30, and is discharged from the lowermost portion 30a to the outside.

  When the outermost lowermost surface 31a and the innermost lowermost surface 32a of the lowermost portion 30a of the groove 30 are formed parallel to the axis x, the concave portions 30b and 30c are formed in the lowermost portion 30a. Instead, the stored foreign matter can be made less likely to remain in the lowermost part 30a, and the foreign matter collected in the lowermost part 30a in the groove 30 can be smoothly discharged to the outside.

  As for the shape of the groove 30, only the inner circumferential groove surface 32 on the inner circumferential side extends obliquely with respect to the axis x as described above, and the outer circumferential groove surface 31 on the outer circumferential side extends parallel to the axis x. May be. Also in this case, the foreign matter that invades from above in the vertical direction can be stored in the groove portion 30, collected below and discharged to the outside.

  As described above, according to the sealing structure 1 according to the embodiment of the present invention, the bending portion 20 e of the slinger 20 enters the groove 30, and the outer groove surface 32, the inner groove surface 32, and the bottom surface 33 of the groove 30 are formed. The gap g having a very small width for forming a labyrinth seal is formed between them, so that foreign substances can hardly reach the sealing device 10.

  The outer peripheral groove surface 31 that is the outer peripheral surface of the groove 30 is inclined toward the outer peripheral side, and the inner peripheral groove surface 32 that is the inner peripheral surface of the groove 30 is inclined toward the inner peripheral side. Therefore, foreign matter can be stored in the recessed portions 30b and 30c formed by the inner circumferential groove surface 32 or the outer circumferential groove surface 31 and the bottom surface 33, guided to the lowermost portion 30a by gravity, and discharged to the outside. For this reason, even if a foreign substance has entered the inside of the groove 30, it is possible to make it difficult for the foreign substance to reach the sealing device 10.

  In addition, since the bending portion 20e enters the groove 30 with a larger diameter as it enters the inside of the groove 30, the foreign matter can enter the sealing device 10 from the outer peripheral side of the bending portion 20e. The contaminated foreign matter passes through a narrow passage formed by the outer circumferential groove surface 31 and the bent portion 20 e, goes around the bent portion 20 e of the bent portion 20 e entering the groove portion 30, passes through the gap g, and It is necessary to pass through a narrow passage formed by the side groove surface 32 and the bending portion 20e. For this reason, the flow resistance of the foreign matter to the sealing device 10 side increases, so that it is possible to suppress the foreign material from entering the sealing device 10 side. Further, since the bending portion 20e extends obliquely toward the inner side and the outer side, foreign matter entering from the outer side is stored in a recess between the outer surface of the bending portion 20e and the wheel mounting flange 56. be able to. Further, the stored foreign matter can be discharged to the outside by centrifugal force or own weight. With this structure also, it is possible to prevent foreign substances from entering the sealing device 10 side.

  As described above, according to the sealing structure 1 according to the embodiment of the present invention, it is possible to improve the function of preventing foreign matter from entering while avoiding an increase in generated torque resistance.

  Next, a modified example of the above-described sealing structure 1 according to the embodiment of the present invention will be described with reference to FIG. Hereinafter, the same or similar configurations as the above-described sealing structure 1 will be denoted by the same reference numerals, and the description thereof will be omitted, and only different configurations will be described.

  In the present modified example, as shown in FIG. 7, the slinger 20 includes a gasket portion 40 for sealing between the slinger 20 and the wheel mounting flange 56. The gasket part 40 is attached to the inner peripheral side of the bending part 20e. An outer peripheral side portion 20f which is an outer peripheral side portion of the disk portion 20c of the slinger 20 is formed so as to be slightly displaced inward and extend to the outer peripheral side. As shown in FIG. 7, the gasket part 40 is an annular member protruding outward, and is formed of an elastic body. Specifically, the gasket portion 40 is attached to the outer peripheral side portion 20 f of the disk portion 20 c of the slinger 20, and has an annular shape protruding outwardly in contact with the inner surface of the wheel mounting flange 56 of the hub wheel 55. The projection 41 is provided. The gasket part 40 is adhered to the outer peripheral side part 20f of the slinger 20 by cross-linking adhesion like the elastic body part 11, so that the protrusion 41 in the hub bearing 50 is pressed against the inner surface of the wheel mounting flange 56. Has become.

  According to the present modification, since the gasket portion 40 seals the space between the slinger 20 and the wheel mounting flange 56, foreign matter entering from the outer peripheral side of the sealing structure 1 is located between the slinger 20 and the wheel mounting flange 56. Intrusion can be prevented. As a result, it is possible to prevent foreign substances from entering the hub bearing 50 from between the slinger 20 and the wheel mounting flange 56.

  As described above, the preferred embodiments of the present invention have been described. However, the present invention is not limited to the sealing structure 1 according to the above-described embodiments, but includes all aspects included in the concept of the present invention and the claims. including. In addition, the components may be appropriately selectively combined so as to achieve at least a part of the above-described problems and effects. For example, the shape, material, arrangement, size, and the like of each component in the above-described embodiment can be appropriately changed depending on the specific usage of the present invention.

DESCRIPTION OF SYMBOLS 1 Sealing structure 5, 203 Space 10, 100 Sealing device 11, 112 Elastic body part 12, 111 Reinforcement ring 12a Cylindrical part 12b, 12d Disk part 12c Conical ring part 14 Base part 14a Outer side part 14b Disk part 14c Conical ring part 14d Disk part 15 Outer side lip 16 Inner side lip 17, 117 Radial lip 20 Slinger 20a Cylindrical part 20b Curved surface part 20c Disk part 20e Bend part 20f Outer side part 20g Outer side end part 30 Groove part 30a Lower part 30b, 30c Depression Portion 31 Outer peripheral groove surface 31a Outer peripheral lowermost surface 32 Inner peripheral groove surface 32a Inner peripheral lowermost surface 33 Bottom surface 40 Gasket portion 41 Projection 50, 200 Hub bearing 51, 201 Outer ring 51a Inner peripheral surface 52 Hub 53, 204 Bearing Ball 54 Inner ring 55, 202 Hub ring 55a, 202a Curved peripheral surface 55b Cylindrical part 6 wheel mounting flange 57 hub bolts 65 muddy water 115 and 116 side lip g gap

Claims (6)

A sealing structure for sealing between an annular outer peripheral member rotatable with respect to an axis in a bearing and an annular inner peripheral member at least partially surrounded by the outer peripheral member,
A sealing device attached to the outer peripheral side member,
An annular groove formed in the outer peripheral member and depressed inward,
An annular slinger around the axis attached to the inner peripheral member,
The sealing device includes an annular reinforcing ring centered on the axis, and an annular elastic body portion centered on the axis formed of an elastic body attached to the reinforcing ring,
The elastic body portion includes at least one side lip that abuts the slinger from inside, and a radial lip that abuts the slinger from an outer peripheral side,
The slinger has an annular bent portion protruding inward, and the bent portion of the slinger enters the inside of the groove to form a labyrinth seal ,
In a cross section along the axis, an inner peripheral side groove surface which is an inner peripheral side surface of the groove portion is reduced in diameter at least in part toward the inside . In a cross section along the axis, the inner peripheral groove surface partially extends parallel to the axis, and the inner peripheral groove surface extends parallel to the axis corresponds to the groove and the groove in the bearing. The sealing structure according to claim 1 , wherein the sealing structure is located at a lowermost portion in the vertical direction. In cross-section along said axis, said outer peripheral groove surface is a surface of the outer peripheral side of the groove, at least in part, according to claim 1, characterized in that diametrically enlarged taken to toward the inner or 2 The described sealing structure. In a cross section along the axis, the outer circumferential groove surface partially extends in parallel with the axis, and the portion in which the outer circumferential groove surface extends in parallel with the axis extends vertically in a groove in the bearing. The sealing structure according to claim 3 , wherein the sealing structure is located at a lowermost part of the structure. The sealing structure according to any one of claims 1 to 4 , wherein the bending portion of the slinger expands in diameter toward the inside. The slinger, the is attached to the inner peripheral side than the bent portion includes a gasket portion of the annular projecting outwardly side, the gasket portion is formed so as to contact with the inner circumference side member The sealing structure according to any one of claims 1 to 5 , wherein the sealing structure is provided.

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