JP6743378B2 - Auxiliary seal for sealing device - Google Patents

Description

The present invention relates to an auxiliary seal for a sealing device, and more particularly, to an auxiliary seal for a sealing device that is used as an auxiliary to the sealing device in order to further improve the foreign matter intrusion prevention performance of the sealing device 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 matter such as rainwater, muddy water, and dust. For this reason, conventionally, a hub bearing is provided with a sealing device for sealing the inside thereof. This sealing device not only seals the lubricant inside the hub bearing but also prevents foreign matter from entering the inside.

Further, in the sealing device, for example, a wheel bearing device (for example, refer to Patent Document 1) provided with a deflector as an auxiliary seal made of a cold-rolled rigid plate subjected to anticorrosion treatment separately from the sealing device, polyethylene, and the like. A rolling bearing device for wheels (for example, refer to Patent Document 2) has been proposed in which a sleeve as an auxiliary seal made of a synthetic resin such as polypropylene is provided separately from the sealing device.

JP, 2014-95403, A JP 2012-167691A

However, due to the diversification of vehicle use environments, even if an auxiliary seal is used, foreign matter may intrude in a more severe use environment, and further improvement in foreign matter intrusion prevention performance is required. Was there.

The present invention has been made in view of the above problems, and an object thereof is to provide an auxiliary seal for a sealing device that can further improve the performance of preventing foreign matter intrusion.

In order to achieve the above object, an auxiliary seal for a sealing device according to the present invention includes an annular outer peripheral member that is rotatable relative to each other about an axis in a bearing, and an annular inner member that is at least partially surrounded by the outer peripheral member. An auxiliary seal for a sealing device for sealing between a peripheral member and the peripheral member, wherein the auxiliary seal for a sealing device is formed of a rubber-like elastic member, and the outer surface of the outer peripheral member and the inner peripheral member. An annular main body formed to be attached to the outer peripheral side member in a relatively outer peripheral side of the sealing device in a gap between the inner side surface and the outer peripheral side member so as not to be rotatable relative to the outer peripheral side member around the axis. An annular weir portion that is formed integrally with the main body portion and that functions as a weir when the main body portion is attached to the outer peripheral member, and is integrally formed with the main body portion, and the main body portion is the outer peripheral member. And a flat annular seal portion that forms a labyrinth seal between the inner peripheral side member and the inner side surface of the inner peripheral side member.

In the auxiliary seal for a sealing device according to an aspect of the present invention, the inner peripheral member is provided on the outer surface of the main body portion adjacent to the flat seal portion, and the main body portion is attached to the outer peripheral member. It is characterized by further comprising an annular groove portion formed at a position facing the inner side surface of the.

In the auxiliary seal for a sealing device according to an aspect of the present invention, the annular groove portion includes a cutout portion or a cut portion in a part of the annular groove portion.

In the auxiliary seal for a sealing device according to one aspect of the present invention, the surface of the flat seal portion is surface-treated to reduce contact resistance with the inner side surface of the inner peripheral member.

With the auxiliary seal for a sealing device according to the present invention, the performance of preventing foreign matter from entering can be further improved as compared with the prior art.

It is sectional drawing in the cross section along the axis line which shows schematic structure of the auxiliary|assistant seal for sealing devices which concerns on embodiment of this invention. It is a front view when it sees from the outside which shows the whole schematic structure of the auxiliary seal|sticker for sealing devices which concerns on embodiment of this invention. It is a sectional view in a section along an axis showing a state where an auxiliary seal for sealing devices concerning an embodiment of the invention was attached to a hub bearing with a sealing device. It is an appearance perspective view when it sees from the outside showing the whole schematic structure of the auxiliary seal for sealing devices concerning other embodiments of the present invention.

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

FIG. 1 is a cross-sectional view in a cross section taken along an axis showing a schematic configuration of an auxiliary seal 1 for a sealing device according to an embodiment of the present invention, and FIG. 2 is an auxiliary for a sealing device according to an embodiment of the present invention. FIG. 3 is a front view showing the overall schematic configuration of the seal 1 when viewed from the outside, and FIG. 3 shows a state in which the auxiliary seal 1 for a sealing device according to the embodiment of the present invention is attached to the hub bearing 50 together with the sealing device 10. FIG. 6 is a cross-sectional view of a cross section taken along an axis line that indicates The hub bearing 50 is, for example, a hub bearing that rotatably supports wheels in an automobile. It should be noted that in FIG. 1, the sealing device auxiliary seal 1 is illustrated in a state of being attached to the hub bearing 50.

Hereinafter, for convenience of description, the outer side refers to the arrow a direction in the axis x direction in FIGS. 1 to 3, and the inner side refers to the arrow b direction in the axis x direction. That is, the outer side is the side in the direction facing the outside of the hub bearing 50, and the side facing the atmosphere side in which foreign matter is present. The inner side is the side facing the inside of the hub bearing 50 and the side facing the space 5. In the direction perpendicular to the axis x (hereinafter, also referred to as “radial direction”), the direction away from the axis x (direction of arrow c) is the outer circumference side, and the direction approaching the axis x (direction of arrow d) is the inner circumference side. And

As shown in FIG. 3, the hub bearing 50 includes an annular outer ring 51 as an outer peripheral member having an axis x as a center and an axis line that is rotatable relative to the outer ring 51 and is partially surrounded by the outer ring 51. It has an annular hub 52 as an inner peripheral member centered on x, and a plurality of bearing balls 53 arranged between the outer ring 51 and the hub 52. Specifically, the hub 52 has an inner ring 54 and a hub ring 55, and a wheel (not shown) is attached to a wheel attachment flange 56 of the hub ring 55 by a plurality of hub bolts 57.

The outer ring 51 is a fixed member, and as shown in FIG. 1, an outer peripheral surface 51 a on the outer peripheral side and a flat outer end surface along a direction orthogonal to the outer peripheral surface 51 a (hereinafter, referred to as “outer end surface”). 51b).

The hub wheel 55 is a rotating member, and a curved peripheral surface 55a is formed as an inner side surface in the vicinity of the inner peripheral side end (near the root) of the wheel mounting flange 56. Here, the curved peripheral surface 55a is a curved surface, for example, a hyperbolic curved surface. The hub wheel 55 has an outer peripheral surface 55b as an inner side surface that extends in the outer peripheral direction through a step recessed further outward from the outer peripheral side end of the curved peripheral surface 55a facing the annular recess 51c of the outer ring 51. There is. The outer peripheral surface 55b is, for example, a flat surface and extends in the radial direction.

In the hub bearing 50, an annular space (hereinafter, referred to as “annular space”) between the inner peripheral surface of the outer ring 51 and the curved peripheral surface 55a of the hub ring 55, that is, between the outer ring 51 and the hub ring 55. )5, the sealing device 10 and the sealing device 60 are attached in a press-fitted state (see FIG. 3). In the hub bearing 50, different sealing devices 10 and 60 are attached, but two sealing devices 10 or two sealing devices 60 may be attached.

The sealing devices 10 and 60 prevent the lubricant from leaking from the area of the annular space 5 in which the bearing balls 53 of the hub bearing 50 are provided, and at the same time, prevent foreign matter such as rainwater, muddy water, and dust from entering into this area. Is designed to prevent intrusion from the outside. Although the configuration of the sealing device 10 will be described below, the configuration of the sealing device 60 will be omitted for convenience of description. The sealing devices 10 and 60 are not limited to those having the configurations shown in the drawings or described later, and may have other known configurations.

As shown in FIG. 1, a sealing device 10 attached to a hub bearing 50 is integrally attached to an elastic body portion 11 made of an annular elastic body having an axis x as a center and a state covered with the elastic body portion 11. And an annular reinforcing ring 12 made of a metal centered on the axis x.

Examples of the elastic body of the elastic body portion 11 include various rubber-like elastic members. The rubber-like elastic member is, for example, synthetic rubber such as nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), acrylic rubber (ACM), and fluororubber (FKM). The elastic body portion 11 is molded by cross-linking (vulcanization) using a molding die.

The elastic body portion 11 has a base portion 14, and an outer peripheral side lip 15, an inner peripheral side lip 16, and a radial lip 17 which are portions respectively extending from the base portion 14. The outer peripheral side lip 15 is located on the outer peripheral side with respect to the inner peripheral side lip 16, and the tip portion thereof extends outward. The outer peripheral side lip 15 is in contact with the curved peripheral surface 55a of the hub wheel 55 with a predetermined tightening margin (contact width) at its tip, and forms the first seal portion in the elastic body portion 11. ..

The inner peripheral side lip 16 is located on the inner peripheral side of the outer peripheral side lip 15, and the tip end portion thereof extends outward. The inner peripheral side lip 16 is in contact with the curved peripheral surface 55a of the hub wheel 55 with a predetermined tightening margin at its tip end, and forms a second seal portion in the elastic body portion 11.

The radial lip 17 has its tip end portion extending inwardly and inwardly from the base end portion of the inner peripheral side lip 16 in a back direction. The radial lip 17 is in contact with the curved peripheral surface 55a of the hub wheel 55 with a predetermined tightening margin at the tip thereof, and forms the third seal portion of the elastic body portion 11.

The reinforcing ring 12 is for reinforcing the elastic body portion 11 and is made of a metal material. Examples of the metal material include stainless steel and SPCC (cold rolled steel). The elastic body portion 11 is attached to the reinforcing ring 12 from the inner peripheral side and the outer side.

The reinforcing ring 12 includes a cylindrical cylindrical portion 12a located on the outermost peripheral side, a disk-shaped disk portion 12b bent from an outer end of the cylindrical portion 12a and extending toward the inner peripheral side, and an inner peripheral side of the disk portion 12b. A bent portion 12c that extends inward from the end portion and then bends toward the inner peripheral side is provided. Specifically, the reinforcing ring 12 is formed so that the cylindrical portion 12a is fitted to the inner peripheral surface of the outer ring 51, and the elastic body portion is different from the cylindrical portion 12a, the disc portion 12b, and the bent portion 12c. 11 is integrally bonded so as to cover the inner peripheral side and the outer side.

The reinforcing ring 12 is manufactured by, for example, press working or forging, and is placed in a molding die when the elastic body portion 11 is molded by crosslinking (vulcanization) molding. The elastic body part 11 is integrally formed with the reinforcing ring 12 by bonding the elastic body part 11 to the reinforcing ring 12 by cross-linking adhesion.

Further, in the hub bearing 50, the foreign matter intrusion prevention performance of the sealing device 10 is further improved at a position on the outer peripheral side of the sealing device 10 in the gap between the outer end surface 51b of the outer ring 51 and the curved peripheral surface 55a of the hub ring 55. An auxiliary seal for a sealing device (hereinafter, also referred to as “auxiliary seal”) 1 used as an auxiliary for improving is attached. The auxiliary seal 1 is an auxiliary annular seal member provided separately from the sealing device 10, and is formed so as to be fitted to the outer peripheral surface 51a on the outer peripheral side of the outer ring 51 with a predetermined tightening margin. There is.

Specifically, the auxiliary seal 1 is formed of a rubber-like elastic member, and preferably formed of only the rubber-like elastic member. The rubber-like elastic member is, for example, synthetic rubber such as nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), acrylic rubber (ACM), and fluororubber (FKM). Similarly to the elastic body portion 11 of the sealing device 10, the auxiliary seal 1 is also molded by crosslinking (vulcanization) molding using a molding die.

The auxiliary seal 1 includes an annular main body 2 made of a rubber-like elastic member and having a predetermined thickness, an annular weir 3 protruding inward from the main body 2, and an annular flat surface protruding outward from the main body 2. And a seal portion 4. As shown in FIG. 1, the main body portion 2 has an outer ring centered on the axis x with respect to a gap between an outer end surface 51b as an outer side surface of the outer ring 51 and a curved peripheral surface 55a as an inner side surface of the hub ring 55. It is formed so that it can be attached integrally with 51 so as not to rotate relative thereto.

A seal projection 2b, which is an annular projection that is convex toward the inside, is formed on the inner end surface of the main body 2. When the main body 2 is attached to the outer ring 51, the seal projection 2b is brought into pressure contact with the outer end surface 51b of the outer ring 51 and comes into close contact therewith. That is, the seal projection 2b enhances the sealing property between the main body 2 and the outer end surface 51b of the outer ring 51.

The dam portion 3 is formed integrally with the main body portion 2, functions as a fitting portion when the main body portion 2 is fitted to the outer peripheral surface 51 a of the outer ring 51, and contacts the outer peripheral surface 51 a of the outer ring 51. It has an abutting portion 3a protruding in a convex shape on the inner peripheral side. The contact portion 3a is formed to have a predetermined compression allowance as shown in FIG. 1, and when attached to the outer ring 51, the contact portion 3a is radially compressed and the auxiliary seal 1 is attached to the outer ring 51. It is fitted and fixed to 51.

Further, the weir portion 3 has an inner side surface 3b along a plane orthogonal to the axis x of the weir portion 3, and an inclined surface 3c inclined from the inner side surface 3b toward the upper end surface 2a in the outer peripheral side direction of the main body portion 2. have. The inner side surface 3b is connected to the contact portion 3a, and is formed so as to function as a weir when foreign matter enters from the outside, and prevents foreign matter from entering the inside of the sealing device 10.

The flat seal portion 4 is formed integrally with the main body portion 2, and has an inclined surface 4 a inclined from the upper end surface 2 a on the outer peripheral side of the main body portion 2 toward the outer side and the inner peripheral side, and the inner side surface 3 b of the dam portion 3. Similarly, the outer surface 4b is formed along a surface orthogonal to the axis x, and the inclined surface 4c is formed from the outer surface 4b toward the inner circumferential side and the inner side.

The outer side surface 4b and the inclined surface 4c of the flat seal portion 4 are subjected to, for example, satin finish on their surfaces, and a plurality of irregularities are formed. The satin finish is to form fine grain-shaped protrusions on the outer surface 4b and the inclined surface 4c. The outer surface 4b and the inclined surface 4c of the flat seal portion 4 are formed so as to face the outer peripheral surface 55b of the hub wheel 55 while being fixed to the outer peripheral surface 55b of the hub ring 55, while being attached to the hub bearing 50. Therefore, the outer surface 4b and the inclined surface 4c of the flat seal portion 4 and the outer peripheral surface 55b do not come into sliding contact with each other in the normal state when the hub bearing 50 is in a desired use state.

On the outer surface of the main body portion 2 adjacent to the flat seal portion 4, a plurality of annular groove portions having concave and convex shapes (hereinafter, referred to as "annular groove portions") at positions facing the curved peripheral surface 55a of the outer ring 51. 7 are formed. The annular groove portion 7 is arranged so as to face the curved peripheral surface 55a of the hub wheel 55 at a fixed distance in the state of being attached to the hub bearing 50. The annular groove portion 7 does not necessarily have to be plural, and may be a single annular groove portion 7.

Further, as shown in FIG. 2, a cutout portion 9 having a predetermined width and a predetermined depth is formed in the main body portion 2 so as to extend in the radial direction across both the flat seal 4 and the annular groove portion 7. The cutout portion 9 is a groove-shaped portion formed by cutting out a part of the outside of the main body portion 2. The notch 9 is preferably formed in only one place in the main body 2, but may be formed in two or more places. The depth of the notch 9 is such that the main body 2 of the auxiliary seal 1 is not cut, and the main body 2 is cut from the notch 9 by centrifugal force during rotation. It is a depth with no strength. When the auxiliary seal 1 is attached to the hub bearing 50, the auxiliary seal 1 is attached to the outer ring 51 so that the notch 9 is located vertically downward in the auxiliary seal 1, preferably at the lower end in the vertical direction. There is.

Since the auxiliary seal 1 having such a configuration is made of a rubber-like elastic member, it expands and contracts even when the hub bearing 50 is attached to a wheel, so that it can be easily added to the hub bearing 50 later. Can be installed.

In the auxiliary seal 1 mounted on the hub bearing 50 in this manner, the inner surface 3b of the weir portion 3 in the main body portion 2 functions as a weir against foreign matter from the inside, so that the foreign matter is kept inside the sealing device 10. Intrusion can be suppressed. Further, the auxiliary seal 1 prevents the foreign matter from the outer peripheral side from entering the inside of the sealing device 10 by the upper end surface 2a of the main body portion 2, the inclined surface 3c of the dam portion 3, and the inclined surface 4a of the flat seal portion 4. Can be suppressed.

Furthermore, since the auxiliary seal 1 forms a labyrinth seal between the outer surface 4b and the inclined surface 4c of the flat seal portion 4 and the outer peripheral surface 55b of the hub wheel 55, foreign matter is less likely to enter. In addition, since a plurality of irregularities are formed on the surfaces of the outer side surface 4b and the inclined surface 4c, a water repellent effect is produced, and muddy water or the like is easily discharged to the outside by the action of centrifugal force accompanying the rotation of the auxiliary seal 1. be able to.

Further, since the main body 2 is formed of the rubber-like elastic member, even if the outer surface 4b and the inclined surface 4c contact the outer peripheral surface 55b of the hub wheel 55 due to the eccentricity of the auxiliary seal 1 during rotation, the hub wheel It is possible to prevent damage or damage to 55. Therefore, the flat seal portion 4 of the auxiliary seal 1 is brought as close as possible to the outer peripheral surface 55b of the hub ring 55, and the gap between the flat seal portion 4 and the outer peripheral surface 55b of the hub ring 55 is further narrowed to further improve the foreign matter intrusion prevention performance. Can be improved.

In this case, for example, since fine grain-like projections are formed on the surfaces of the outer surface 4b and the inclined surface 4c by the satin finish, even when the outer surface 4b and the inclined surface 4c contact the outer peripheral surface 55b of the hub wheel 55. It is possible to suppress an increase in torque resistance due to the auxiliary seal 1.

Further, the auxiliary seal 1 catches the foreign matter in the annular groove portion 7 even if the foreign matter enters through the gap between the outer surface 4b and the inclined surface 4c of the flat seal portion 4 and the outer peripheral surface 55b of the hub wheel 55. Thus, it can be easily and effectively discharged from the notch 9 to the outside of the sealing device 10 along the annular groove 7 by being dropped by its own weight.

Thus, the auxiliary seal 1 can further improve the foreign matter intrusion prevention performance as compared with the conventional one. Further, the auxiliary seal 1 has a simple structure made of a rubber-like elastic member having no cored bar or the like as in the conventional case, and thus the foreign substance intrusion prevention performance can be further improved as compared with the conventional case.

In addition, in the above-described embodiment, the case where fine grain-shaped projections are formed on the outer surface 4b and the inclined surface 4c of the flat seal portion 4 by, for example, a satin finish, is described. Not limited to this, fine grain-shaped projections may be formed on the surface of the annular groove portion 7. In addition, various other surface treatments such as forming fine grain-like projections such as embossing and embossing are applied to the outer surface 4b and the inclined surface 4c of the flat seal portion 4 and the surface of the annular groove portion 7 instead of matte processing. You may do it.

Further, in the above-described embodiment, the case where the auxiliary seal 1 provided with the groove-shaped notch 9 in which a part of the outer side of the main body 2 is cut is described, but the present invention is not limited to this. Instead of the auxiliary seal 1, an auxiliary seal 100 as shown in FIG. 4 may be used. This auxiliary seal 100 is provided with a cutting portion 110 that cuts a part of the main body portion 2 instead of the cutout portion 9 of the main body portion 2 in the auxiliary seal 1, and is the same as the auxiliary seal 1 except for this cutting portion 110. It is a structure. In this case, since the auxiliary seal 100 is completely separated in the circumferential direction of the main body portion 2, the main body portion 2 is expanded in diameter even after the hub bearing 50 is attached to the wheel. It is possible to easily add additional parts later.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the auxiliary seal 1 according to the above-mentioned embodiment, and all aspects included in the concept of the present invention and the scope of the claims. including. Further, the respective configurations may be appropriately and selectively combined so as to achieve at least a part of the problems and effects described above. For example, the shape, material, arrangement, size, etc. of each constituent element in the above-described embodiment can be appropriately changed according to the specific usage mode of the present invention.

The case where the auxiliary seal for a sealing device of the present invention is used in a hub bearing of a vehicle or the like has been described. However, the sealing device auxiliary seal of the present invention is not limited thereto, and the sealing device auxiliary seal of the present invention can be used for industrial bearings and truck bearings.

1, 100 Auxiliary seal 2 Main body portion 2a Engagement convex portion 3 Dam portion 3a Abutting portion 3b Inner side surface 3c, 4a, 4c Inclined surface 4 Flat seal portion 4b Outer side surface 7 Annular groove portion 9 Notch portion 10, 60 Sealing device 11 Elastic Body part 12 Reinforcing ring 12a Cylindrical part 12b Disk part 12c Bending part 14 Base part 15 Outer peripheral side slip 16 Inner peripheral side lip 17 Radial lip 50 Hub bearing 51 Outer ring 51a Outer peripheral face 51b Outer end face 51c Annular recess 53 Bearing ball 54 Inner ring 55 hub wheel 55a curved peripheral surface 55b outer peripheral surface 56 wheel mounting flange 57 hub bolt 110 cut portion x axis

Claims (5)

An auxiliary seal for a sealing device of a sealing device, which seals between an annular outer peripheral member that is rotatable relative to each other about an axis in a bearing and an annular inner peripheral member that is at least partially surrounded by the outer peripheral member. hand,
The auxiliary seal for the sealing device is formed of a rubber-like elastic member,
The auxiliary seal for the sealing device,
In the gap between the outer side surface of the outer peripheral side member facing one side in the axial direction and the inner side surface of the inner peripheral side member facing the other side in the axial direction, on the outer peripheral side of the sealing device. An annular body portion formed to be attached to the outer peripheral member in a position such that the outer peripheral member cannot rotate relative to the outer peripheral member about the axis.
An annular weir portion that is formed integrally with the main body portion and that functions as a weir when the main body portion is attached to the outer peripheral member,
An annular flat seal portion that is integrally formed with the main body portion and forms a labyrinth seal between the main body portion and the inner side surface of the inner peripheral side member when the main body portion is attached to the outer peripheral side member,
The dam portion is formed so that it can be fitted to the outer peripheral member ,
The inner side surface of the inner peripheral side member is provided on an outer side surface of the main body section adjacent to the flat seal section facing one side in the axial direction, and the main body section is attached to the outer peripheral side member. Annular groove formed at a position facing the
An auxiliary seal for a sealing device , further comprising: The auxiliary seal for a sealing device according to claim 1 , wherein the annular groove portion includes a cutout portion or a cut portion in a part of the annular groove portion. The sealing device according to claim 1 or 2 , wherein the surface of the flat seal portion is subjected to surface processing for reducing a contact resistance with the inner side surface of the inner peripheral member. Auxiliary seal. The sealing device according to any one of claims 1 to 3, wherein the weir portion has an abutting portion that protrudes toward an inner peripheral side that abuts the outer peripheral side member in a compressed state. Auxiliary seal. The weir portion projects from the main body portion to the other side in the axial direction,
The auxiliary seal for a sealing device according to any one of claims 1 to 4, wherein the flat seal portion protrudes from the main body portion to one side in the axial direction.

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