WO2020116901A1 - Sealing device and wheel bearing assembly comprising same - Google Patents

Abstract

One aspect of the present disclosure provides embodiments of a sealing device. According to one embodiment of the present disclosure, provided is a sealing device disposed in an inner axial direction of a bearing between an outer wheel portion and an inner wheel portion that rotate relative to each other in a wheel bearing assembly. The sealing device according to one embodiment of the present disclosure may include an inner device portion and an outer device portion rotating relative to each other. In one embodiment of the present disclosure, the inner device portion includes an inner frame fixed to the inner wheel portion, and an inner sealing member covering at least a portion of the surface of the inner frame, and the outer device portion may include an outer frame which is fixed to the outer wheel portion and has an inner radial end surface which is radially facing an outer circumferential sealing portion. In one embodiment, the inner sealing member includes the outer circumferential sealing portion covering an outer radial end surface of the inner frame, and the outer circumferential sealing portion may include a protrusion protruding from the outer circumferential sealing portion in an outer radial direction.

Description

Sealing device and wheel bearing assembly comprising same

The disclosed embodiments relate to sealing devices used in vehicle wheel bearings and wheel bearing assemblies having such sealing devices.

Generally, a wheel bearing assembly for a vehicle refers to a device that enables a vehicle to move by rotatably connecting a wheel to a vehicle body. Such a wheel bearing assembly may be divided into a wheel bearing assembly for a driving wheel that transmits power generated in an engine and a wheel bearing assembly for a driven wheel that does not transmit driving force.

The wheel bearing assembly for a drive wheel includes a rotating element and a non-rotating element. The rotating element is adapted to rotate with the drive shaft by torque generated by the engine and passing through the transmission. Further, the non-rotating element is fixed to the vehicle body, and a rolling element (for example, a ball) is interposed between the rotating element and the non-rotating element. The wheel bearing assembly for the driven wheel is not connected to the drive shaft through which the rotating element transmits power generated by the engine, and most of the configuration is similar to the wheel bearing assembly for the driving wheel.

The outer ring is a non-rotating element and can be secured by being coupled to the suspension of the vehicle. The wheel hub or inner ring can be rotated relative to the outer ring as a rotating element. A technique is known in which a sealing device is installed between the outer ring and the inner ring and between the outer ring and the wheel hub to prevent foreign matter from entering the space where the rolling element is disposed.

The sealing device of the conventional wheel bearing assembly includes a lip and a slinger that slides in contact with each other during relative rotation of the rotating and non-rotating elements. In such a sealing device, the lip and the slinger contact each other to perform a sealing function, but in this process, a large frictional torque is generated between the lip and the slinger, and there is a problem that the wear of the lip increases due to heat generated by friction.

Embodiments of the present disclosure provide a sealing device configured to prevent foreign matter from entering the space formed between the outer ring portion and the inner ring portion and a wheel bearing assembly including the same.

As described above, the sealing device used in the conventional wheel bearing assembly has a problem that the sealing device generates a large frictional torque due to excessive contact between the lip and the slinger when the outer and inner ring parts rotate relative to each other. Embodiments of the present disclosure is to solve this problem, while reducing the friction torque drastically, so that the sealing device can exert a function of preventing foreign substances from flowing smoothly.

In order to solve the above-described problems, embodiments of the present disclosure provide a sealing device having a plurality of protrusions protruding in a radial direction to provide a contactless sealing function, and a wheel bearing assembly including the same.

One aspect of the present disclosure provides embodiments of the sealing device. According to an embodiment of the present disclosure, there is provided a sealing device disposed in an inner axial direction of a bearing between an outer ring portion and an inner ring portion that rotate relative to each other of the wheel bearing assembly. The sealing device according to an embodiment of the present disclosure may include an inner device portion and an outer device portion rotating relative to each other. In one embodiment of the present disclosure, the inner device portion includes an inner frame fixed to the inner ring portion and an inner sealing member covering at least a portion of the inner frame, and the outer device portion is fixed to the outer ring portion and radially with the outer circumferential sealing portion. As may include an outer frame having an inner radial end surface facing each other. In one embodiment, the inner sealing member includes an outer circumferential sealing portion covering an outer radial end surface of the inner frame, and the outer circumferential sealing portion may include a protrusion protruding from the outer circumferential sealing portion in an outer radial direction.

In one embodiment, the protrusions may be formed in a plurality spaced apart from each other along the circumferential direction.

In one embodiment, the radial distance between the outer radial end face of the protrusion and the opposing face facing the protrusion of the outer device portion may be smaller at the outer axial end of the protrusion than at the inner axial end of the protrusion.

In one embodiment, the radial distance between the outer radial end surface of the protrusion and the opposing surface may be smaller toward the outer axial direction.

In one embodiment, the outer radial end surface of the projection may include an inclined surface extending inclined in a direction between the outer axial direction and the outer radial direction at the inner axial end.

In one embodiment, the facing surface facing the protrusion of the outer device portion may include an inclined facing surface inclined in a direction between the inner axial direction and the outer radial direction, and the inclined facing surface is radially outward from the protruding end of the protrusion. In one embodiment, the outer device portion may include an outer sealing member covering at least a portion of the outer frame, and an inclined facing surface may be formed on the outer sealing member.

In one embodiment, a circumferential distance between two protrusions adjacent to each other in a circumferential direction among the plurality of protrusions may be smaller at an outer axial end of the plurality of protrusions than at an inner axial end of the plurality of protrusions.

In one embodiment, the outer circumferential sealing portion may include an encoder extension portion protruding in the outer axial direction to support the projection.

In one embodiment, the outer device portion includes an outer sealing member covering at least a portion of the outer frame, the outer sealing member includes an inner circumferential sealing portion covering an inner radial end surface of the outer frame, and the inner circumferential sealing portion Protrusions formed to protrude in the inner radial direction from the inner circumferential sealing portion may be included.

In one embodiment, the projections formed on the inner circumferential sealing portion of the outer sealing member may be formed in a plurality of spaced apart from each other along the circumferential direction.

According to an embodiment of the present disclosure, there is provided a sealing device disposed in an inner axial direction of a bearing between an outer ring portion and an inner ring portion that rotate relative to each other of the wheel bearing assembly. Sealing device according to an embodiment of the present disclosure may include an inner device portion and an outer device portion that rotate relative to each other. In one embodiment, the outer device portion includes an outer frame fixed to the outer ring portion and an outer seal member covering at least a portion of the outer frame, and the inner device portion may include an inner frame fixed to the inner ring portion. In one embodiment, the outer sealing member includes an inner circumferential sealing portion covering the inner radial direction of the outer frame, and the inner circumferential sealing portion may include a protrusion protruding in the inner radial direction from the inner circumferential sealing portion.

In one embodiment, the protrusions may be formed to be spaced apart from each other along the circumferential direction. In one embodiment, the radial distance between the inner radial end face of the protrusion and the opposite face facing the protrusion of the inner device portion is , May be smaller at the outer axial end of the projection than at the inner axial end of the projection.

In one embodiment, the radial distance between the inner radial end surface of the protrusion and the opposing surface may be smaller toward the outer axial direction.

In one embodiment, the inner radial end surface of the protrusion may include an inclined surface extending inclined in a direction between the outer axial direction and the inner radial direction at the inner axial end.

In one embodiment, the opposing surface facing the protrusion of the inner device portion may include an inclined facing surface inclined in a direction between the inner axial direction and the inner radial direction, and the inclined facing surface is inwardly radial from the protruding end of the protrusion. It can be placed in a spaced position.

In one embodiment, the inner device portion may include an inner sealing member covering at least a portion of the inner frame, and an inclined facing surface may be formed on the inner sealing member.

In one embodiment, a circumferential distance between two protrusions adjacent to each other in the circumferential direction among the plurality of protrusions may be smaller at an outer axial end of the plurality of protrusions than at an inner axial end of the plurality of protrusions.

According to one embodiment of the present disclosure, a wheel bearing assembly is provided. Wheel bearing assembly according to an embodiment of the present disclosure, the outer ring portion; An inner ring portion disposed in an inner radial direction of the outer ring portion and configured to be rotatable relative to the outer ring portion; A bearing disposed between the outer ring portion and the inner ring portion; And the sealing device described above.

According to embodiments of the present disclosure, a protrusion protruding in the radial direction of the sealing portion of the sealing device is provided, and the outer ring portion and the inner ring are dramatically reduced while the frictional torque of the sealing device is drastically reduced when the outer ring portion and the inner ring portion rotate relative to each other. It is possible to efficiently prevent foreign substances from entering the space between the parts.

According to embodiments of the present disclosure, the above-described protrusion is integrally formed with the outer circumferential sealing part provided in the inner sealing device or the inner circumferential sealing part provided with the outer sealing device, and is protruded in the radial direction to prevent foreign matter from entering. It can greatly enhance the durability and fixing force of the projection to be performed.

1 is a cross-sectional view showing a wheel bearing assembly according to a first embodiment of the present disclosure.

FIG. 2 is a cross-sectional view showing a sealing device according to the first embodiment shown in FIG. 1.

FIG. 3 is a partial elevation view of the sealing device of FIG. 2 as viewed in the outer axial direction (OA).

4 to 8 are diagrams showing modified examples of the sealing device of the first embodiment.

9 is a cross-sectional view showing a sealing device according to a second embodiment.

10 is a sectional view showing a sealing device according to a third embodiment.

<Explanation of codes>

1: wheel bearing assembly, 10: inner ring portion, 11: wheel hub, 16: inner ring, 30: outer ring portion, 40: bearing, 41: multiple rolling elements, 46: retainer, 50: knuckle, 61: wheel bolt, 66 : Knuckle bolt, 70: Dust shield, 90: Seal device, 100, 200, 300, 400, 500, 600, 100', 100'': Sealing device, 110: Inner device part, 111: Inner frame, 111a: Made 1 inner frame portion, 111b: second inner frame portion, 111c: third inner frame portion, 115: inner sealing member, 115a: outer circumferential sealing portion, 115d: encoder portion, 120: outer device portion, 121: outer frame, 121a : 1st outer frame part, 121b: 2nd outer frame part, 125: outer sealing member, 125a: inner circumferential sealing part, 125h, 125j: seal lip, 125i, 125k: radial lip, P, P': protrusion, Q , Q': facing

The embodiments of the present disclosure are exemplified for the purpose of illustrating the technical spirit of the present disclosure. The scope of rights according to the present disclosure is not limited to the embodiments presented below or the specific description of these embodiments.

All technical and scientific terms used in the present disclosure, unless defined otherwise, have meanings generally understood by those of ordinary skill in the art to which this disclosure belongs. All terms used in the present disclosure are selected for the purpose of more clearly describing the present disclosure and are not selected to limit the scope of the rights according to the present disclosure.

As used in this disclosure, expressions such as “comprising”, “having”, “having”, and the like, are open terms that imply the possibility of including other embodiments, unless stated otherwise in the phrase or sentence in which the expression is included. (open-ended terms).

The expressions of the singular forms described in this disclosure may include the meaning of the plural forms unless otherwise stated, and the same applies to the expressions of the singular forms described in the claims.

Expressions such as “first” and “second” used in the present disclosure are used to distinguish a plurality of components from each other, and do not limit the order or importance of the components.

The dimensions and values described in the present disclosure are not limited to the dimensions and values described. Unless otherwise specified, these dimensions and values can be understood to mean the stated values and equivalent ranges including them. For example, a dimension of '0.1 mm' described in this disclosure can be understood to include'about 0.1 mm'.

As used in the present disclosure, the "outer radial" direction directive means a direction away from the axis in a radial direction with respect to the rotational axis of the rotating body, and the "inner radial direction" direction directive is the opposite direction of the outer radial direction Means In addition, the "direction of the outer axial direction" used in the present disclosure refers to a direction toward the outside of the vehicle body along the rotation axis of the rotating body, and the "direction of the inner axial direction" directs the inside of the vehicle body along the rotation axis of the rotating body. It means the direction toward. Further, the "direction in the circumferential direction" used in the present disclosure means both directions rotating around the rotation axis of the rotating body, and defines one direction of the circumferential direction as the "first direction" and the other direction " Second direction". In the drawings, the rotation axis C of the rotating body, the outer radial direction OR, the inner radial direction IR, the outer axial direction OA, the inner axial direction IA, the first direction Cl1, and the second direction ( Cl2) is shown.

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In the accompanying drawings, identical or corresponding components are given the same reference numerals. In addition, in the following description of the embodiments, the same or corresponding elements may be omitted. However, although descriptions of components are omitted, it is not intended that such components are not included in any embodiment.

1 is a cross-sectional view showing a wheel bearing assembly 1 according to a first embodiment of the present disclosure.

Referring to FIG. 1, the wheel bearing assembly 1 according to the first embodiment of the present disclosure includes an outer ring portion 30 and an inner ring portion 10 that rotate relative to each other. The inner ring portion 10 is disposed in the inner radial direction IR of the outer ring portion 30. The inner ring portion 10 is configured to be rotatable relative to the outer ring portion 30. The outer ring portion 30 supports the inner ring portion 10 so as to be capable of relative rotation.

The outer ring portion 30 may be configured as an outer ring 30. The outer ring 30 is coupled to the knuckle 50. The outer ring 30 has a flange projecting in the outer radial direction (OR). The outer ring 30 and the knuckle 50 may be coupled via a knuckle bolt 66 penetrating the flange of the outer ring 30 in the axial direction (OA, IA). A dust shield 70 may be interposed between the outer ring 30 and the knuckle 50. The knuckle bolt 66 may penetrate the dust shield 70.

In the embodiment shown in FIG. 1, the inner ring portion 10 includes a wheel hub 11 and an inner ring 16, but in another embodiment not shown, the inner ring portion 10 is composed of only the wheel hub 11 It might be. Hereinafter, description will be given based on the inner ring portion 10 of this embodiment. The inner ring 16 is coupled to the wheel hub 11. The inner ring 16 is pressed onto the outer circumferential surface of the wheel hub 11. The inner ring 16 rotates integrally with the wheel hub 11.

In the present disclosure, the "first rotation" of the first component and the second component means that the first component rotates in the same rotational speed and the same rotational speed as the second component. Not only when is coupled (or connected) to the second component and rotates together, the first component is coupled (or connected) to the third component and the third component is coupled (or connected) to the second component. It means that the first component is rotated like the second component.

Among the outer circumferential surfaces of the wheel hub 11, the inner ring 16 may be fitted and coupled to the outer axial direction OA on a portion positioned in the inner axial direction IA. An orbital forming portion 11a protruding in the outer radial direction OR is formed at an end of the inner axial direction IA of the wheel hub 11 to prevent flow of the inner ring 16 into the inner axial direction IA. Can be.

A wheel (not shown) may be coupled to the wheel hub 11. The wheel hub 11 has a flange projecting in the outer radial direction (OR). The wheel hub 11 and the wheel may be coupled via a wheel bolt 61 penetrating the flange of the wheel hub 11 in the axial direction (OA, IA).

The wheel bearing assembly 1 includes a bearing 40 disposed between the outer ring portion 30 and the inner ring portion 10. The bearing 40 is disposed between the outer peripheral surface of the inner ring portion 10 and the inner peripheral surface of the outer ring portion 30. The inner ring portion 10 is rotatably supported on the outer ring portion 30 via a bearing 40.

The bearing 40 may include a plurality of rolling elements 41 disposed between the outer circumferential surface of the wheel hub 11 and the inner circumferential surface of the outer ring 30 opposed thereto. In addition, the bearing 40 may include a plurality of rolling elements 41 disposed between the outer circumferential surface of the inner ring 16 and the inner circumferential surface of the outer ring 30 opposed thereto.

In one embodiment, the plurality of rolling elements 41 are arranged in two rows at predetermined intervals in the axial direction (OA, IA), but the number of rows in the axial direction (OA, IA) of the plurality of rolling elements 41 is thus It is not limited, and the plurality of rolling elements 41 may be arranged in one row or three or more rows. Further, in the present embodiment, the plurality of rolling elements 41 are shown as ball bearings, but the plurality of rolling elements 41 may be formed of roller bearings, tapered roller bearings, needle bearings, and the like. Further, in the present embodiment, the plurality of rolling elements 41 are formed of a metal material, but the plurality of rolling elements 41 may be formed of various materials such as plastic.

The plurality of rolling elements 41 arranged in each row are arranged in the circumferential direction. The bearing 40 may include a retainer 46 (retainer) for maintaining a plurality of rolling elements 41 at regular intervals along the circumferential direction. The retainer 46 constrains the positions of the plurality of rolling elements 41. The retainer 46 is located between the outer ring portion 30 and the inner ring portion 10.

A space (bearing space) in which the bearing 40 can be arranged is formed between the outer ring portion 30 and the inner ring portion 10. The bearing space extends in the circumferential direction about the rotation axis (C). Grease may be injected into the bearing space for smooth rotation of the rolling element 41.

The wheel bearing assembly 1 includes a sealing device 100 and a seal device 90 that prevent foreign matter from entering the bearing space. The sealing device 100 and the sealing device 90 can also prevent leakage of grease injected into the bearing space.

The sealing device 90 is located in the outer axial direction OA with respect to the bearing 40. The sealing device 90 is disposed between the outer ring portion 30 and the inner ring portion 10. The sealing device 90 is disposed between the inner ring portion 10 and the outer ring portion 30 in an outer axial (OA) position relative to the bearing 40. Specifically, the sealing device 90 may be disposed between the outer circumferential surface of the wheel hub 11 and the inner circumferential surface of the outer ring 30. 1, the sealing device 90 is schematically shown.

The sealing device 100 is located in the inner axial direction IA with respect to the bearing 40. The sealing device 100 is disposed between the outer ring portion 30 and the inner ring portion 10. The sealing device 100 may be disposed between the inner circumferential surface 30a of the outer ring portion 30 and the outer circumferential surface 10a of the inner ring portion 10. Hereinafter, various embodiments of the sealing device will be described.

Hereinafter, the sealing device 100 according to the first embodiment will be described with reference to FIGS. 2 and 3. FIG. 2 is a cross-sectional view showing the sealing device 100 according to the first embodiment shown in FIG. 1, and FIG. 3 is a partial elevation view of the sealing device of FIG. 2 viewed in an outer axial direction OA. For reference, the cross-sectional view of FIG. 2 shows the shape of the sealing device 100 seen from the direction cut along the line S1-S1' of FIG. 3, for example.

The sealing device 100 includes an inner device part 110 and an outer device part 120 that rotate relative to each other. An opening 100h opened in an inner axial direction IA is formed between the inner device portion 110 and the outer device portion 120.

The inner device portion 110 is fixed to the inner ring portion 10. The inner device portion 110 rotates integrally with the inner ring portion 10. The inner device unit 110 may include an inner frame 111 and an inner sealing member 115. The inner frame 111 supports the inner sealing member 115.

The outer device portion 120 is fixed to the outer ring portion 30. The inner device part 110 may be configured to be slidable with respect to the outer device part 120. The outer device unit 120 may include an outer frame 121 and an outer sealing member 125. The outer frame 121 supports the outer sealing member 125.

The inner device portion 110 includes an inner frame 111 fixed to the inner ring portion 10. The inner frame 111 may be formed of a metal material. The inner frame 111 may be manufactured by pressing a plate material. The inner frame 111 extends in the circumferential directions (Cl1, Cl2) and is formed in a ring shape as a whole. The inner frame 111 includes a first inner frame portion 111a, a second inner frame portion 111b extending from the first inner frame portion 111a, and a third inner frame portion 111c extending from the second inner frame. It may include.

The inner frame 111 may include a first inner frame portion 111a fixed to the inner ring portion 10. In the present disclosure, the first inner frame portion 111a may be referred to as an inner ring portion mounting frame portion 111a. The inner radial direction (IR) end face of the first inner frame portion 111a may be pressed into the outer circumferential surface of the inner ring portion 10. The first inner frame portion 111a has a predetermined thickness in the radial directions (OR, IR). The first inner frame portion 111a faces the inner radial direction (IR) end of the second outer frame portion 121b in the outer radial direction (OR). In the first inner frame portion 111a, the radial lip 125i of the outer sealing member 125 contacts the outer radial (OR) end surface so as to be slidable. The first inner frame portion 111a extends in the axial directions (OA, IA). The first inner frame portion 111a forms an end in the outer axial direction OA and is connected to the second inner frame portion 111b at the inner axial direction IA end.

The inner frame 111 may include a second inner frame portion 111b extending in the outer radial direction OR from the first inner frame portion 111a. In the present disclosure, the second inner frame portion 111b may be referred to as an outwardly extending frame portion 111b. The second inner frame portion 111b may extend from an inner axial end portion IA of the first inner frame portion 111a. The second inner frame portion 111b has a predetermined thickness in the axial directions (OA, IA). The second inner frame portion 111b faces the inner axial direction IA end surface of the second outer frame portion 121b in the outer axial direction OA. The seal lip 125h of the outer sealing member 125 slidably contacts the outer axial direction OA end surface of the second inner frame portion 111b.

The inner frame 111 may include a third inner frame portion 111c extending in the outer axial direction OA from the second inner frame portion 111b. In the present disclosure, the third inner frame portion 111c may be referred to as an axially extending frame portion 111c. The third inner frame portion 111c may extend from an outer radial direction (OR) end of the second inner frame portion 111b. The third inner frame portion 111c has a predetermined thickness in the radial directions (OR, IR).

The third inner frame portion 111c faces the inner peripheral surface 121d of the first outer frame portion 121a in the radial direction (OR, IR). The third inner frame part 111c faces the opposite surface Q of the outer device part 120 in the radial direction (OR, IR). The third inner frame part 111c faces the inner circumferential sealing part 125a of the outer sealing member 125 in the radial direction (OR, IR).

The outer radial direction (OR) end surface of the third inner frame portion 111c may be referred to as an outer peripheral surface 111d. The outer circumferential surface 111d forms an outer radial (OR) end surface of the inner frame 111. The outer circumferential surface 111d faces the opposing surface Q in the radial direction (OR, IR).

The inner device unit 110 may include an inner sealing member 115 fixed to the inner frame 111. The inner sealing member 115 may be formed of a rubber material or a plastic material. The inner sealing member 115 extends in the circumferential directions (Cl1, Cl2) and is formed in a ring shape as a whole.

The inner sealing member 115 is spaced apart from the outer device portion 120. For example, the outer device portion 120 does not include a lip or the like that contacts the inner sealing member 115, and the inner sealing member 115 does not include a lip or the like that contacts the outer device portion 120.

The inner sealing member 115 covers at least a portion of the outer radial (OR) end surface of the inner frame 111. The inner sealing member 115 includes an outer circumferential sealing portion 115a that covers the outer circumferential surface 111d of the inner frame 111. The outer circumferential sealing portion 115a covers the outer circumferential surface 111d of the third inner frame portion 111c. The outer circumferential sealing portion 115a is spaced apart from the outer device portion 120 in the radial direction (OR, IR).

The inner sealing member 115 may include an end sealing portion 115b covering the outer axial (OA) end of the third inner frame portion 111c. The end sealing portion 115b extends from the outer axial direction OA end of the outer circumferential sealing portion 115a in the inner radial direction IR.

The inner sealing member 115 may include a locking sealing portion 115c covering the inner axial (IA) end surface of the outer axial (OA) end of the third inner frame portion 111c. The engaging sealing portion 115c extends from the inner radial direction IR end of the end sealing portion 115b to the inner axial direction IA.

The inner sealing member 115 includes a projection P extending radially from the outer circumferential sealing portion 115. For example, the inner sealing member 115 may include a plurality of protrusions P that protrude in the outer radial direction OR from the outer circumferential sealing portion 115a and are integrally formed with the outer circumferential sealing portion 115a. The detailed description of the projection P will be described later.

The outer circumferential sealing portion 115a of the inner sealing member 115 has a predetermined thickness t in the radial direction (OR, IR). The thickness t of the outer circumferential sealing portion 115a may be 0.1 mm or more, and preferably, the thickness t may be 0.3 mm or more. Through this, during the injection molding operation of the inner sealing member 115, the injection material flows smoothly, and adhesion of the inner sealing member 115 to the inner frame 111 is solidified. In addition, the thickness t of the outer circumferential sealing portion 115a is preferably 70% or less of the radial distance gap between the outer circumferential surface 111d and the opposing surface Q.

The outer device portion 120 includes an outer frame 121 fixed to the outer ring portion 30. The outer frame 121 may be formed of a metal material. The outer frame 121 may be manufactured by pressing a plate material. The outer frame 121 extends in the circumferential directions (Cl1, Cl2) and is formed in a ring shape as a whole. The outer frame 121 may include a first outer frame portion 121a and a second outer frame portion 121b extending from the first outer frame portion 121a.

The outer frame 121 may include a first outer frame portion 121a fixed to the outer ring portion 30. In the present disclosure, the first outer frame portion 121a may also be referred to as an outer ring portion mounting frame portion 121a. The outer radial direction (OR) end surface of the first outer frame portion 121a may be pressed into the inner circumferential surface of the outer ring portion 30. The first outer frame portion 121a has a predetermined thickness in the radial directions (OR, IR).

The first outer frame part 121a faces the third inner frame part 111c in the radial direction (OR, IR). The first outer frame portion 121a faces the outer circumferential sealing portion 115a in a radial direction. The first outer frame part 121a faces the plurality of protrusions P in the inner radial direction IR. The first outer frame part 121a forms an end in the inner axial direction IA and is connected to the second outer frame part 121b at the outer axial direction OA end.

The inner radial direction (IR) end surface of the first outer frame portion 121a may be referred to as an inner peripheral surface 121d. The inner circumferential surface 121d forms an inner radial end surface 121d of the first outer frame part 121a. The inner circumferential surface 121d faces the plurality of protrusions P in the radial direction (OR, IR).

The first outer frame portion 121a may include an extension portion 121a1 inserted into the outer sealing member 125. The extension part 121a1 is disposed at an inner axial end portion IA of the first outer frame part 121a. The radial (OR, IR) thickness of the extension portion 121a1 is smaller than the radial (OR, IR) thickness of other portions of the first outer frame portion 121a. A step is formed on the outer radial direction (OR) end surface of the first outer frame portion 121a by the extension portion 121a1.

The outer frame 121 may include a second outer frame portion 121b extending in the inner radial direction IR from the first outer frame portion 121a. In the present disclosure, the second outer frame portion 121b may be referred to as an inwardly extending frame portion 121b. The second outer frame portion 121b may extend from an outer axial (OA) end of the first outer frame portion 121a. The second outer frame portion 121b has a predetermined thickness in the axial directions (OA, IA). The second outer frame part 121b faces the outer axial direction OA end surface of the second inner frame part 111b in the inner axial direction IA.

The second outer frame portion 121b may include a first flange portion 121b1 extending in the inner radial direction IR from the first outer frame portion 121a. The first flange portion 121b1 faces the outer axial direction (OA) end of the third inner frame portion 111c in the inner axial direction (IA).

The second outer frame portion 121b may include a second flange portion 121b2 extending in a direction between the inner radial direction IR and the inner axial direction IA from the first flange portion 121b1. The second flange portion 121b2 extends from the inner radial (IR) end of the first flange portion 121b1.

The second outer frame portion 121b may include a third flange portion 121b3 extending in the inner radial direction IR from the second flange portion 121b2. The third flange portion 121b3 extends from an inner radial (IR) end of the second flange portion 121b2. The third flange portion 121b3 faces the outer axial (OA) end surface of the second inner frame portion 111b in the inner axial direction (IA).

The outer device unit 120 may include an outer sealing member 125 fixed to the outer frame 121. The outer sealing member 125 may be formed of a rubber material or a plastic material. The outer sealing member 125 extends in the circumferential directions Cl1 and Cl2 and is formed in a ring shape as a whole.

The outer sealing member 125 covers at least a portion of the outer frame 121 surface. The outer sealing member 125 includes an inner circumferential sealing portion 125a covering the inner circumferential surface 121d of the first outer frame portion 121a. The inner circumferential sealing portion 125a forms opposing surfaces Q facing the plurality of protrusions P in the inner radial direction IR.

The outer sealing member 125 may include an axial end sealing portion 125b covering the inner axial end of the first outer frame portion 121a. The axial end sealing portion 125b extends from the inner axial end IA of the inner circumferential sealing portion 125a to the outer radial direction OR.

The outer sealing member 125 may include a first locking sealing portion 125c that covers an outer radial (OR) end surface of the extension portion 121a1. The first engaging sealing portion 125c extends from the outer radial (OR) end of the axial end sealing portion 125b in the outer axial direction (OA). The first locking sealing portion 125c fills the outer radial end surface of the first outer frame portion 121a stepped by the extension portion 121a1.

The outer sealing member 125 may include an overmold portion 125d protruding in the outer radial direction OR from the first locking sealing portion 125c. The inner circumferential surface of the outer ring portion 30 and the outer circumferential surface of the outer sealing member 125 may be more strongly pressed by the overmold portion 125d. Through this, it is possible to effectively prevent the intrusion of foreign matter between the contact surfaces of the outer device portion 120 and the outer ring portion 30.

The outer sealing member 125 may include a flange sealing portion 125e covering the inner axial (IA) end surface of the second outer frame portion 121b. The flange sealing portion 125e extends from the outer axial direction (OA) end of the inner circumferential sealing portion 125a in the inner radial direction (IR). The flange sealing portion 125e includes a first flange sealing portion 125e1 covering the inner axial end surface of the first flange portion 121b1 and an inner axial direction (IA) of the second flange portion 121b2. A second flange sealing portion 125e2 covering the end surface and a third flange sealing portion 125e3 covering the inner axial (IA) end surface of the third flange portion 121b3 may be included.

The outer sealing member 125 may include a radial end sealing portion 125f covering an inner radial (IR) end of the second outer frame portion 121b. The radial end sealing portion 125f extends from the inner radial (IR) end of the flange sealing portion 125e in the outer axial direction (OA).

The outer sealing member 125 may include a second locking sealing portion 125g that covers an outer axial (OA) end surface of the inner radial direction (IR) end of the second outer frame portion 121b. The second locking sealing portion 125g extends in the outer radial direction OR from the outer axial direction OA end of the radial end sealing portion 125f.

The outer sealing member 125 may include at least one seal lip 125h protruding from the flange sealing portion 125e in the inner axial direction IA. The seal lip 125h slidably contacts the second inner frame portion 111b. The seal lip 125h may be elastically deformed in the outer radial direction OR by contacting the inner device portion 110.

A plurality of seal lips 125h may be provided. The plurality of seal lips 125h may include a first seal lip 125h1 and a second seal lip 125h2 spaced apart in a radial direction (OR, IR). A partitioned space may be formed between the first seal lip 125h1 and the second seal lip 125h2.

In other embodiments not shown, the sealing device may not include a plurality of seal lips. For example, among the configurations of the outer device portion 120 of the sealing device, the configuration that contacts the inner device portion 110 may be only one seal lip 125h and only one radial lip 125i. Through this, the friction torque according to the relative rotation of the outer device part 120 and the inner device part 110 can be further reduced.

The outer sealing member 125 may include a radial lip 125i protruding in the inner radial direction IR from the radial end sealing portion 125f. The radial lip 125i is slidably contacting the first inner frame portion 111a. The radial lip 125i may be elastically deformed in the outer axial direction OA by contacting the inner device portion 110.

Among the configurations of the outer device portion 120 of the sealing device 100, only the seal lip 125h and the radial lip 125i are in contact with the inner device portion 110. The opposite surface Q of the outer device portion 120 and the inner device portion 110 are separated from each other. Through the omission of the lip contacting the opposite surface (Q) of the outer device portion 120 or the inner device portion 110, the friction torque due to the relative rotation of the outer device portion 120 and the inner device portion 110 is reduced. I can do it.

The plurality of protrusions P of the sealing device 100 according to the first embodiment are formed on the inner sealing member 115. The plurality of protrusions P protrude in the outer radial direction OR from the outer circumferential sealing portion 115a. The plurality of protrusions P are spaced apart from the outer device portion 120. The plurality of protrusions P are spaced apart from the opposing surface Q of the outer device portion 120. The opposing surface (Q) forms an inner radial direction (IR) end surface of the inner circumferential sealing portion (125a). The plurality of protrusions P are spaced apart from each other in the circumferential directions Cl1 and Cl2. The plurality of protrusions P may be arranged spaced apart from each other at regular intervals in the circumferential directions Cl1 and Cl2. Through a plurality of protrusions (P) spaced apart from the outer device portion 120, while reducing the generation of friction torque when the relative rotation of the inner ring portion 10 relative to the outer ring portion 30, while reducing the occurrence of friction torque from the outside in the outer axial direction (OA) By causing the foreign matter to be introduced between the outer ring portion 30 and the inner ring portion 10 to collide with a plurality of protrusions that rotate relative to each other, it is possible to effectively prevent the inflow of foreign substances.

The projection P includes a circumferential surface P11 forming side surfaces of the circumferential directions Cl1 and Cl2. The circumferential surface P11 of one protrusion P faces the circumferential surface P11 of the other adjacent protrusion P. The circumferential surface P11 is a first side P11a facing the first direction Cl1, which is one of the circumferential directions, and a second side Cl2 that is opposite to the first direction Cl1. It includes two side surfaces (P11b).

The protrusion P may include an inner axial face P12 facing the inner axial direction IA and an outer axial face P13 facing the outer axial direction OA. The inner axial face P12 looks at the open direction of the opening 100h.

The protrusion P may include an end surface P14 facing the outer radial direction OR. The outer radial end face P14 looks at the opposing face Q. The outer radial end face P14 is spaced from the opposing face Q. The outer radial end surface P14 of the projection P may include an inclined surface extending inclined in a direction between the outer axial direction OA and the outer radial direction OR.

The protrusion P may include a protruding end P20 that forms the most protruding point in the outer radial direction OR. The protruding end P20 may constitute a part of the outer radial end face P14.

The distance (radial distance) between the outer radial end surface P14 of the projection P and the opposing surface Q of the outer device portion 120 is higher than that at the inner axial direction IA end of the projection P. It is preferable that it is smaller at the outer axial (OA) end of the projection P. 2 and 3, the outer axial (OA) end and the opposing surface (Q) of the projection (P) than the distance (d2) between the inner axial (IA) end and the opposing surface (Q) of the projection (P) The smaller the distance d1 between is shown. Through this, it is possible to make it more difficult for foreign substances to flow through the space between the protrusions P and the opposing surfaces Q from the outside.

The distance (radial distance) between the outer radial end surface P14 and the opposing surface Q of the projection P may become smaller toward the outer axial direction OA. Through this, it is possible to induce foreign substances to be introduced in the outer axial direction OA to be discharged in the inner axial direction IA.

The distance between any two protrusions P adjacent to each other in the circumferential directions Cl1 and Cl2 among the plurality of protrusions P is greater than that at the inner axial direction IA end of the plurality of protrusions P ( Smaller at the outer axial (OA) end of P) is preferred. In FIG. 3, between the outer axial (OA) ends of the two projections P than the distance d4 between the inner axial (IA) ends of the two projections P adjacent to each other in the circumferential directions Cl1 and Cl2 It is shown that the distance d3 of is smaller. Here, the distances d3 and d4 are distances measured in the circumferential directions Cl1 and Cl2. By having such a configuration, it is possible to make it more difficult for foreign substances to pass through the space between the plurality of protrusions P from the outside and into the sealing device.

The distance between two projections P adjacent to each other in the circumferential directions Cl1 and Cl2 may be smaller toward the outer axial direction OA. By having such a configuration, it is possible to induce foreign substances to be introduced in the outer axial direction OA to be discharged in the inner axial direction IA.

In another embodiment, not shown, the plurality of protrusions P may extend in a direction between any one of the axial directions OA and IA and one of the circumferential directions Cl1 and Cl2. By having such a configuration, when the inner device portion 110 rotates relative to the outer device portion 120, it is possible to induce the discharge of the inner axial direction (IA) of the foreign material through which the plurality of protrusions P are introduced. For example, the plurality of protrusions P may extend in the direction between the inner axial direction IA and the first direction Cl1, and the direction in which the wheel rotates in order for the vehicle body to travel forward is the second direction ( Cl2). Here, the center of the inner axial face P12 of any one of the protrusions P may be spaced apart from the center of the outer axial face P13 and the circumferential directions Cl1 and Cl2.

Hereinafter, referring to FIG. 4, a description will be given of a sealing device 200 according to a modified example of the first embodiment, focusing on differences from the sealing device 100 according to the first embodiment. 4 is a cross-sectional view showing the sealing device 200.

The inner sealing member 115 of the sealing device 200 includes an encoder portion 115d. The encoder portion 115d includes a magnetic material. The rotation speed of the inner ring portion 10 can be detected by a sensor (not shown) configured to correspond to the encoder portion 115d. As the encoder portion 115d rotates around the rotation axis C, the magnetic field generated by the portion containing the magnetic material of the encoder portion 115d changes, and the sensor detects the change in the magnetic field. can do. As another example, an annular member having magnetism may be attached to the inner axial (IA) end surface of the encoder portion 115d. In addition, a part of the encoder portion 115d may be formed of a material having such magnetism, and the remaining portion of the encoder portion 115d may be formed of a rubber material or a plastic material. For example, the encoder unit 115d may include ferrite, rare earth (rare earth elements) materials as magnetic materials, specifically neodymium (Nd), samarium (Sm), And cobalt (Co).

The encoder portion 115d extends from the inner axial end IA of the outer circumferential sealing portion 115a. The encoder portion 115d extends in the inner radial direction IR from the outer circumferential sealing portion 115a. The encoder portion 115d covers the inner axial end surface of the second inner frame portion 111b. Here, the inner axial (IA) end (P12) of the projection (P) may be disposed on the outer radial (OR) end surface of the encoder portion (115d). Through this, the encoder portion 115d is integrally formed with the inner sealing member 115 to improve the convenience of manufacturing, while securing the surface on which the projection P is seated in the axial direction (OA, IA) for a long time to protrude (P). ) Can be fixed more firmly.

Hereinafter, the sealing device 300 according to another modification of the first embodiment will be described with reference to FIG. 5, focusing on the difference from the sealing device 100 according to the first embodiment. 5 is a cross-sectional view showing the sealing device 300.

The facing surface Q of the outer device portion 120 of the sealing device 300 includes an inclined facing surface Q1 inclined in a direction between the inner axial direction IA and the outer radial direction OR. The inclined facing surface Q1 is spaced apart from the protruding end P20 of the projection P in the outer radial direction OR. The inclined facing surface Q1 is formed on the outer sealing member 125. By inducing the foreign material to be discharged in the inner axial direction IA by the inclined facing surface Q1, it is possible to more effectively block the foreign material from flowing into the outer axial direction OA.

The sealing device 300 extends at an end in the inner axial direction IA of the inclined facing surface Q1 at an angle smaller than the inclination of the inclined opposite surface Q1 and extends at an angle smaller than the inclined direction OA, IA. ). In the embodiment of Fig. 5, the extended opposing surface Q2 extends parallel to the axial directions OA, IA.

Hereinafter, referring to FIG. 6, a description will be given of a sealing device 400 according to another modified example of the first embodiment, focusing on differences from the sealing device 100 according to the first embodiment. 6 is a cross-sectional view showing the sealing device 400.

In the sealing device 400, the distance between the outer radial direction (OR) end surface P14 of the protrusion P and the opposing surface Q may not decrease as it goes toward the outer axial direction OA in at least some sections. . The distance between some of the end faces P14 and P14b and the opposing face Q may be constant.

The outer radial (OR) end face P14 of the projection P of the sealing device 400 is inclined in the direction between the outer axial direction OA and the outer radial direction OR at the inner axial end IA. It includes an extended inclined surface (P14a) and an extended surface (P14b) extending at a smaller angle with the axial direction (OA, IA) than the inclined surface of the inclined surface (P14a) at the outer axial (OA) end of the inclined surface (P14a) do. The distance d1 between the extended surface P14b and the opposing surface Q is smaller than the distance d2 between the inclined surface P14a and the opposing surface Q. Through this, the portion having a small distance between the outer radial direction (OR) end surface P14 and the opposite surface (Q) is elongated in the axial direction (OA, IA), so that foreign matter flows into the outer axial direction (OA) It can be blocked more effectively. In the embodiment of Fig. 6, the extended surface P14b extends parallel to the axial directions OA, IA.

The distance between the inclined surface (P14a) and the opposing surface (Q) of the sealing device 400 becomes smaller toward the outer axial direction (OA). The distance d1 between the extended surface P14b of the sealing device 400 and the opposite surface Q is constant at any point in the axial directions OA and IA. The distance d1 between the extended surface P14b and the opposing surface Q is equal to or less than the minimum value of the distance between the inclined surface P14a and the opposing surface Q.

Hereinafter, referring to FIG. 7, a description will be given of a sealing device 500 according to another modification of the first embodiment, focusing on differences from the sealing device 100 according to the first embodiment. 7 is a cross-sectional view showing the sealing device 500.

The opposing surface Q of the outer device portion 120 of the sealing device 500 includes an inclined opposing surface Q1 inclined in a direction between the inner axial direction IA and the outer radial direction OR. The inclined facing surface Q1 is spaced apart from the protruding end P20 of the projection P in the outer radial direction OR.

The sealing device 500 extends at an inner axial (IA) end of the inclined facing surface (Q1) at an angle smaller than the inclination of the inclined facing surface (Q1) in the axial direction (OA, IA). ). In the embodiment of Fig. 7, the extended opposing surface Q2 extends parallel to the axial directions OA, IA.

In the sealing device 500, the distance between the outer radial direction (OR) end surface P14 of the protrusion P and the opposing surface Q may not decrease as it goes toward the outer axial direction OA in at least some sections. . The distance between some of the end faces P14 and P14b and the opposing face Q may be constant.

The outer radial (OR) end face P14 of the projection P of the sealing device 500 is inclined in the direction between the outer axial direction OA and the outer radial direction OR at the inner axial end IA. It includes an extended inclined surface P14a and an extended surface P14b extending from the outer axial direction OA end of the inclined surface P14a. The distance d1 between the extended surface P14b and the opposing surface Q is smaller than the distance d2 between the inclined surface P14a and the opposing surface Q. In the embodiment of Fig. 7, the extended surface P14b has an inclination in the direction between the outer axial direction OA and the inner radial direction IR and extends.

The distance between the inclined surface (P14a) and the opposing surface (Q) of the sealing device 500 becomes smaller toward the outer axial direction (OA). The distance d1 between the extended surface P14b of the sealing device 500 and the opposite surface Q is constant at any point in the axial directions OA and IA. The distance d1 between the extended surface P14b and the opposing surface Q is equal to or less than the minimum value of the distance between the inclined surface P14a and the opposing surface Q.

The extended surface P14b of the sealing device 500 faces the inclined facing surface Q1. The inclination of the extended surface P14b of the sealing device 500 may be the same as the inclination of the inclined opposite surface Q1.

Hereinafter, referring to FIG. 8, a description will be given of a sealing device 600 according to another modification of the first embodiment, focusing on differences from the sealing device 100 according to the first embodiment. 8 is a cross-sectional view showing the sealing device 600.

The inner frame 111 of the sealing device 600 includes a first inner frame portion 111a and a second inner frame portion 111b extending from the first inner frame portion 111a. The inner frame 111 does not include the third inner frame portion. The end of the outer radial direction OR of the second inner frame portion 111b forms the outer radial end surface 111d of the inner frame 111. The outer radial end surface 111d of the inner frame 111 may be surrounded by the inner sealing member 115. The outer circumferential sealing portion 115a of the inner sealing member 115 covers the outer radial end face 111d of the inner frame 111.

The outer sealing portion 115a of the sealing device 600 includes an end sealing portion 115a1 disposed on the outer radial end surface 111d of the inner frame 111. The end sealing portion 115a1 supports the protrusion P. The projection P is disposed on the surface of the outer radial direction OR of the end sealing portion 115a1. The end sealing portion 115a1 is connected to the encoder extension portion 115a2 in the outer axial direction OA. The end sealing portion 115a1 may be connected to the encoder portion 115d in the inner axial direction (IA).

The outer circumferential sealing portion 115a of the sealing device 600 includes an encoder extension portion 115a2 protruding in the outer axial direction OA. The encoder extension portion 115a2 supports the projection P. The protrusion P is disposed on the surface of the outer radial direction OR of the encoder extension portion 115a2. The protrusion P may extend along the surfaces of the encoder extension portion 115a2 and the end sealing portion 115a1. The encoder extension portion 115a2 is connected to the end sealing portion 115a1 in the inner axial direction IA. The encoder extension portion 115a2 may contact the second inner frame portion 111b in the inner axial direction IA. The end of the outer axial direction OA of the encoder extension 115a2 may form a free end. The end surface of the inner radial direction IR of the encoder extension portion 115a2 is configured not to contact the inner frame 111.

The outer frame 121 of the sealing device 600 may include a first outer frame portion 121a and a second outer frame portion 121b extending from the first outer frame portion 121a.

The outer frame 121 of the sealing device 600 includes a first outer frame portion 121a fixed to the outer ring portion 30. The first outer frame part 121a includes a press-fitting part 121a3 whose outer radial direction (OR) end face is pressed into the inner circumferential surface of the outer ring part 30. The press-in portion 121a3 constitutes an inner axial direction IA portion of the first outer frame portion 121a.

The first outer frame portion 121a of the sealing device 600 includes a connecting frame portion 121a2 that extends while connecting between the press-in portion 121a3 and the second outer frame portion 121b. The connecting frame portion 121a2 is connected to the press-in portion 121a3 in the inner axial direction IA. The connecting frame part 121a2 is connected to the second outer frame part 121b in the outer axial direction OA. The surface of the outer radial direction OR of the connecting frame portion 121a2 may be covered by the outer sealing member 125.

The connecting frame portion 121a2 may extend in a direction between the outer axial direction OA and the inner radial direction IR. The connection frame portion 121a2 may extend in a direction inclined with respect to the axial directions OA and IA.

The outer sealing member 125 of the sealing device 600 may include a seal lip 125j protruding in the inner axial direction IA from the flange sealing portion 125e. The seal lip 125j slidably contacts the second inner frame portion 111b. The seal lip 125j may be elastically deformed in the outer radial direction OR by contacting the inner device portion 110.

The outer sealing member 125 of the sealing device 600 may include a radial lip 125k protruding in the inner radial direction IR from the radial end sealing portion 125f. The radial lip 125k is slidably contacting the first inner frame portion 111a. The radial lip 125k may be elastically deformed in the inner axial direction IA by contacting the inner device portion 110.

The outer sealing member 125 of the sealing device 600 may include a non-contact lip 125l protruding in the inner radial direction IR from the radial end sealing portion 125f. The non-contact lip 125l is spaced from the inner frame 111. The non-contact lip 125l forms a free end at the end of the inner radial direction IR. The non-contact lip 125l may protrude in a direction between the inner radial direction IR and the outer axial direction OA.

The outer sealing member 125 of the sealing device 600 does not include the first engaging sealing portion covering the outer radial end (OR) end surface of the distal end of the inner axial direction IA of the first outer frame portion 121a. Does not. The outer sealing member 125 of the sealing device 600 includes a locking sealing portion 125p that covers an outer radial (OR) end surface of the connecting frame portion 121a2. The engaging sealing portion 125p fills the outer radial (OR) end surface of the first outer frame portion 121a inclined by the connecting frame portion 121a2.

The outer sealing member 125 of the sealing device 600 may further include an outer sealing portion 125m covering the outer axial (OA) end surface of the second outer frame portion 121b. The outer sealing portion 125m may extend in the outer radial direction OR from the radially end sealing portion 125f. The engaging sealing portion 125p is connected to the outer radial direction (OR) end of the outer sealing portion 125m.

The outer sealing member 125 of the sealing device 600 may further include a protrusion 125n protruding in the outer axial direction (OA) from the outer sealing portion 125m. The protrusion 125n may be located in the middle portion of the outer sealing portion 125m.

The outer sealing member 125 of the sealing device 600 may include an overmold portion 125q protruding in the outer radial direction OR from the locking sealing portion 125p. The inner circumferential surface of the outer ring portion 30 and the outer circumferential surface of the outer sealing member 125 may be more strongly pressed by the overmold portion 125q. Through this, it is possible to effectively prevent the intrusion of foreign matter between the contact surfaces of the outer device portion 120 and the outer ring portion 30.

Hereinafter, referring to FIG. 9, a description will be given of a sealing device 100 ′ according to a second embodiment, focusing on differences from the sealing device 100 according to the first embodiment. 9 is a cross-sectional view showing a sealing device 100' according to a second embodiment.

In the sealing device 100' according to the second embodiment, protrusions (eg, a plurality of protrusions P') are formed on the outer device portion 120 and the opposing surface Q'is provided on the inner device portion 110. Is formed. The projections of the sealing device 100' (eg, a plurality of projections P') are formed on the outer sealing member 125. The facing surface Q'of the sealing device 100' is formed on the inner sealing member 115.

The outer circumferential sealing portion 115a of the sealing device 100' forms an opposite surface Q'facing the plurality of protrusions P'in the outer radial direction OR. The first outer frame part 121a of the sealing device 100' faces the opposite surface Q'of the inner device part 110 in the radial direction (OR, IR). The inner circumferential surface 121d faces the opposing surface Q'in the radial direction (OR, IR).

The outer sealing member 125 of the sealing device 100' is spaced apart from the inner device portion 110. For example, the inner device portion 110 does not include a lip or the like contacting the outer sealing member 125, and the outer sealing member 125 does not include a lip or the like contacting the inner device portion 110. The inner circumferential sealing portion 125a is spaced apart from the inner device portion 110 in the radial direction (OR, IR).

Of the configurations of the outer device portion 120 of the sealing device 100', only the seal lip 125h and the radial lip 125i are in contact with the inner device portion 110. The opposite surface Q'of the inner device portion 110 and the outer device portion 120 are separated from each other. Through this, the friction torque according to the relative rotation of the outer device part 120 and the inner device part 110 can be reduced.

The outer sealing member 125 of the sealing device 100' includes a plurality of protrusions P'formed integrally with the inner circumferential sealing portion 125a. The plurality of protrusions P'protrude from the inner circumferential sealing portion 125a. The third inner frame portion 111c faces the plurality of protrusions P'in the outer radial direction OR. The outer circumferential surface 111d faces the plurality of protrusions P'in the radial direction (OR, IR).

The plurality of protrusions P'of the sealing device 100' protrude in the inner radial direction IR from the inner circumferential sealing portion 125a. The plurality of protrusions P'are spaced apart from the inner device portion 110. The plurality of protrusions P'are spaced apart from the opposite surface Q'of the inner device portion 110. The opposing surface Q'forms an outer radial (OR) end surface of the outer circumferential sealing portion 115a. The plurality of protrusions P'are spaced apart from each other in the circumferential directions Cl1 and Cl2. The plurality of protrusions P'may be arranged spaced apart from each other at regular intervals in the circumferential directions Cl1 and Cl2. Through the plurality of protrusions P'spaced apart from the inner device portion 110, while reducing the generation of friction torque during relative rotation of the inner ring portion 10 with respect to the outer ring portion 30, the outer axial direction from the outside (OA) ) By allowing the foreign matter to flow between the outer ring portion 30 and the inner ring portion 10 to collide with a plurality of relative rotating protrusions, it is possible to effectively prevent the inflow of foreign substances.

The projection P'includes a circumferential surface P11' forming side surfaces of the circumferential directions Cl1 and Cl2. The circumferential surface P11' of one protrusion P'faces the circumferential surface P11' of the adjacent other protrusion P'. The circumferential surface P11' faces the first side P11a' facing the first direction Cl1, which is one of the circumferential directions, and the second direction Cl2 which is the opposite direction of the first direction Cl1. The beam includes a second side P11b'.

The protrusion P'may include an inner axial face P12' facing the inner axial direction IA and an outer axial face P13' facing the outer axial direction OA. The inner axial face P12' looks at the open direction of the opening 100h.

The projection P'may include a radial surface P14' facing the inner radial IR. The radial face P14' looks at the opposite face Q'. The radial face P14' is spaced from the opposite face Q'. The radial surface P14' of the projection P'may include an inclined surface extending inclined in a direction between the outer axial direction OA and the inner radial direction IR.

The protrusion P'may include a protruding end P20' forming the most protruding point in the inner radial direction IR. The protruding end P20' may constitute a part of the radial surface P14'.

The distance between the outer radial end surface P14' of the projection P'and the opposite surface Q'of the inner device portion 110 is greater than that at the inner axial (IA) end of the projection P'. It may be smaller at the outer axial (OA) end of P'). In Fig. 9, the outer axial (OA) end of the projection (P') and the opposing surface (Q') than the distance (d2) between the inner axial (IA) end of the projection (P') and the opposing surface (Q') It is shown that the distance d1 between) is smaller. Through this, it is possible to make it more difficult for foreign substances to flow through the space between the projections P'and the opposing surfaces Q'from the outside.

Among the plurality of protrusions P', the distance between any two protrusions P'adjacent to each other in the circumferential directions Cl1 and Cl2 is more plural than the inner axial direction IA end of the plurality of protrusions P'. It is preferably smaller at the outer axial (OA) end of the projection P'. The distance between two projections P'adjacent to each other in the circumferential directions Cl1 and Cl2 may become smaller toward the outer axial direction OA.

In another embodiment not shown, the plurality of protrusions P'may extend in a direction between any one of the axial directions OA and IA and one of the circumferential directions Cl1 and Cl2. For example, the plurality of protrusions P'may extend in a direction between the inner axial direction IA and the first direction Cl1, and the direction in which the wheel rotates in order for the vehicle body to travel forward is the second direction. (Cl2). Here, the center of the inner axial face P12' of one of the protrusions P'may be spaced apart from the center of the outer axial face P13' and the circumferential directions Cl1 and Cl2.

The distance between the inner radial end surface P14' of the protrusion P'and the opposing surface Q'may become smaller toward the outer axial direction OA. Through this, it is possible to induce foreign substances to be introduced in the outer axial direction OA to be discharged in the inner axial direction IA.

The inner circumferential sealing portion 125a of the outer sealing member 125 of the sealing device 100' has a predetermined thickness t in the radial direction (OR, IR). The thickness t of the outer peripheral sealing portion 115a of the sealing device 100 ′ may be 0.1 mm or more, and preferably the thickness t may be 0.3 mm or more. Through this, during the injection molding operation of the outer sealing member 125, the injection material flows smoothly, and adhesion of the outer sealing member 125 to the outer frame 121 is solidified. Further, the thickness t of the inner peripheral sealing portion 125a of the sealing device 100' is preferably 70% or less of the distance gap between the inner peripheral surface 121d and the opposite surface Q'.

Hereinafter, a sealing device according to modified examples not shown in the second embodiment will be described. Modifications of the second embodiment can be understood as those applied to the second embodiment with the modification examples with reference to FIGS. 4 to 7 of the first embodiment.

In a modification of the second embodiment, not shown, the inner sealing member 115 of the sealing device 100 ′ may include an encoder portion. The encoder portion includes a magnetic material. The rotation speed of the inner ring portion 10 may be sensed by a sensor configured to correspond to the encoder portion. The encoder portion may extend from an inner axial (IA) end of the outer circumferential sealing portion 115a. The encoder portion may extend in the inner radial direction IR from the outer circumferential sealing portion 115a. The encoder portion may cover the inner axial (IA) end surface of the second inner frame portion 111b. Here, the inner axial (IA) end (P12') of the projection (P') may be disposed spaced apart in the outer radial direction (OR) from the encoder portion.

In another modification of the second embodiment, not shown, the opposite surface Q'of the inner device portion 110 of the sealing device 100' is in a direction between the inner axial direction IA and the inner radial direction IR. It may include an inclined inclined facing surface. The inclined facing surface may be spaced apart from the protruding end P20' of the projection P'in the inner radial direction IR. The inclined facing surface may be formed on the inner sealing member 115. By inducing the foreign material to be discharged in the inner axial direction (IA) by the inclined facing surface, it is possible to more effectively block the foreign material from flowing in the outer axial direction (OA).

The sealing device 100 ′ may include an extended opposing surface extending at an angle smaller than the inclination of the inclined opposing surface at an inner axial (IA) end of the inclined opposing surface at a smaller angle to the axial direction (OA, IA). . The extended opposing surfaces may extend parallel to the axial directions (OA, IA).

In the sealing device 100' according to another modification of the second embodiment not shown, the distance between the inner radial (IR) end surface P14' and the opposite surface Q'of the protrusion P'is at least In some sections, it may not decrease as it goes toward the outer axial direction (OA). The distance between some of the end surfaces P14' and the opposite surface Q'may be constant.

The inner radial (IR) end surface P14' of the projection P'of the sealing device 100' is the direction between the outer axial direction OA and the inner radial direction IR at the inner axial end IA. It may include an inclined surface extending inclined, and an extended surface extending at a smaller angle to the axial direction (OA, IA) than the inclined surface at the outer axial (OA) end of the inclined surface. The distance between the extended surface and the opposite surface Q'may be smaller than the distance between the inclined surface and the opposite surface Q'. Through this, the portion having a small distance between the inner radial direction (IR) end surface P14' and the opposite surface (Q') is elongated in the axial directions (OA, IA), so that foreign matter flows into the outer axial direction (OA). You can block more effectively. The extension surface may extend parallel to the axial directions (OA, IA).

The distance between the inclined surface and the opposing surface Q'of the sealing device 100' may be smaller as it goes toward the outer axial direction OA. The distance between the extended surface and the opposite surface Q'of the sealing device 100' may be constant at any point in the axial directions OA and IA. The distance between the extended surface and the opposite surface Q'may be less than or equal to a minimum value of the distance between the inclined surface and the opposite surface Q'.

In still another modification of the second embodiment, not shown, the opposite surface Q'of the inner device portion 110 of the sealing device 100' is a direction between the inner axial direction IA and the inner radial direction IR. It may include an inclined facing surface. The inclined facing surface may be spaced apart from the protruding end P20' of the projection P'in the inner radial direction IR.

The sealing device 100 ′ may include an extended opposing surface extending at an angle smaller than the inclination of the inclined opposing surface at an inner axial (IA) end of the inclined opposing surface at a smaller angle to the axial direction (OA, IA). . The extended facing surfaces extend parallel to the axial directions (OA, IA).

In the sealing device 100', the distance between the inner radial direction (IR) end surface P14' and the opposing surface Q'of the projection P'may not decrease as it goes toward the outer axial direction OA. The distance between some of the end surfaces P14' and the opposite surface Q'may be constant.

The inner radial (IR) end surface P14' of the projection P'of the sealing device 100' is the direction between the outer axial direction OA and the inner radial direction IR at the inner axial end IA. It may include an inclined surface extending inclined, and an extended surface extending from the outer axial direction (OA) end of the inclined surface. The distance between the extended surface and the opposite surface Q'may be smaller than the distance between the inclined surface and the opposite surface Q'. The extended surface may have an inclination in the direction between the outer axial direction OA and the outer radial direction OR and extend.

The distance between the inclined surface and the opposing surface Q'of the sealing device 100' may be smaller as it goes toward the outer axial direction OA. The distance between the extended surface and the opposite surface Q'of the sealing device 100' may be constant at any point in the axial directions OA and IA. The distance between the extended surface and the opposite surface Q'may be less than or equal to a minimum value of the distance between the inclined surface and the opposite surface Q'.

The extending surface of the sealing device 100' may face the inclined facing surface. The inclination of the extended surface of the sealing device 100' may be the same as the inclination of the inclined opposite surface.

Hereinafter, referring to FIG. 10, with reference to the difference between the sealing device 100 according to the first embodiment and the sealing device 100 ′ according to the second embodiment, the sealing device 100 according to the third embodiment ) Is as follows. 10 is a cross-sectional view showing a sealing device 100 ″ according to a third embodiment.

The sealing device 100 ″ according to the third embodiment includes a plurality of protrusions P formed on the inner sealing member 115 and a plurality of protrusions P′ formed on the outer sealing member 125. The inner sealing member 115 includes a plurality of protrusions P integrally formed with the outer circumferential sealing portion 115a, and the outer sealing member 125 has a plurality of protrusions integrally formed with the inner circumferential sealing portion 125a ( P'). The plurality of protrusions P protrude in the outer radial direction OR from the outer circumferential sealing portion 115a, and the plurality of protrusions P'protrude in the inner radial direction IR from the inner circumferential sealing portion 125a. The plurality of protrusions P are spaced apart from each other in the circumferential directions Cl1 and Cl2, and the plurality of protrusions P'are spaced apart from each other in the circumferential directions Cl1 and Cl2.

In the sealing device 100 ″, the plurality of protrusions P are spaced apart from the outer device part 120, and the plurality of protrusions P′ are spaced apart from the inner device part 110. The plurality of protrusions P face the opposing surface Q formed on the outer device portion 120 in the outer radial direction OR, and the plurality of protrusions P'are inner device portions in the inner radial direction IR. 110) facing the opposite surface (Q') formed. The plurality of protrusions P face the plurality of protrusions P'in the outer radial direction OR. The plurality of protrusions P and the plurality of protrusions P'are spaced apart from each other in the radial direction (OR, IR). Meanwhile, the plurality of protrusions P formed on the inner sealing member 115 and the plurality of protrusions P'formed on the outer sealing member 125 may be disposed at radially overlapping positions as shown in the drawing. , It may be configured to be alternately positioned along the circumferential direction (ie, the protrusions P'are located between the plurality of protrusions P adjacent to each other).

Although the technical spirit of the present disclosure has been described by the examples shown in the accompanying drawings and some embodiments, the technical spirit and scope of the present disclosure can be understood by those skilled in the art to which the present disclosure pertains. It will be appreciated that various substitutions, modifications and changes can be made in the range. In addition, such substitutions, modifications and variations should be considered within the scope of the appended claims.

Claims (20)

1. In the sealing device disposed in the inner axial direction of the bearing between the outer ring portion and the inner ring portion rotating relative to each other of the wheel bearing assembly,

   An inner device portion and an outer device portion rotating relative to each other,

   The inner device portion includes an inner frame fixed to the inner ring portion, and an inner sealing member covering at least a portion of the inner frame surface,

   The outer device portion includes an outer frame fixed to the outer ring portion and having an inner radial end surface radially facing the outer circumferential sealing portion,

   The inner sealing member includes an outer circumferential sealing portion covering an outer radial end surface of the inner frame,

   The outer circumferential sealing portion includes a protrusion protruding from the outer circumferential sealing portion in an outer radial direction,

   Sealing device.
2. According to claim 1,

   The protrusions are spaced apart from each other along the circumferential direction and formed in plural.

   Sealing device.
3. According to claim 2,

   The radial distance between the outer radial end surface of the projection and the opposite surface facing the projection of the outer device portion is smaller at the outer axial end of the projection than at the inner axial end of the projection,

   Sealing device.
4. According to claim 3,

   The radial distance between the outer radial end surface of the protrusion and the opposing surface becomes smaller as it goes outward in the axial direction,

   Sealing device.
5. According to claim 3,

   The outer radial end surface of the projection includes an inclined surface extending inclined in a direction between the outer axial direction and the outer radial direction at the inner axial end,

   Sealing device.
6. According to claim 2,

   The opposite surface facing the protrusion of the outer device portion includes an inclined opposite surface inclined in a direction between an inner axial direction and an outer radial direction,

   The inclined facing surface is disposed at a position spaced apart from the protruding end of the projection in the outer radial direction,

   Sealing device.
7. The method of claim 6,

   The outer device portion includes an outer sealing member covering at least a portion of the outer frame surface,

   The inclined facing surface is formed on the outer sealing member,

   Sealing device.
8. According to claim 2,

   A circumferential distance between two protrusions adjacent to each other in the circumferential direction among the plurality of protrusions is smaller at an outer axial end of the plurality of protrusions than at an inner axial end of the plurality of protrusions,

   Sealing device.
9. According to claim 2,

   The outer circumferential sealing portion,

   It includes an encoder extending from the outer axial direction to support the projection,

   Sealing device.
10. According to claim 1,

    The outer device portion includes an outer sealing member covering at least a portion of the outer frame surface,

    The outer sealing member includes an inner circumferential sealing portion covering an inner radial end surface of the outer frame,

    The inner circumferential sealing portion includes a protrusion that protrudes in the inner radial direction from the inner circumferential sealing portion,

    Sealing device.
11. The method of claim 10,

    The protrusions formed on the inner circumferential sealing portion of the outer sealing member are spaced apart from each other along the circumferential direction and formed in plural.

    Sealing device.
12. In the sealing device disposed in the inner axial direction of the bearing between the outer ring portion and the inner ring portion rotating relative to each other of the wheel bearing assembly,

    An inner device portion and an outer device portion rotating relative to each other,

    The outer device portion includes an outer frame fixed to the outer ring portion, and an outer sealing member covering at least a portion of the outer frame surface,

    The inner device portion includes an inner frame fixed to the inner ring portion,

    The outer sealing member includes an inner circumferential sealing portion covering the inner radial direction of the outer frame,

    The inner circumferential sealing portion includes a projection formed to protrude in the radial direction from the inner circumferential sealing portion,

    Sealing device.
13. The method of claim 12,

    The protrusions are spaced apart from each other along the circumferential direction and formed in plural.

    Sealing device.
14. The method of claim 13,

    The radial distance between the inner radial end surface of the projection and the opposite surface facing the projection of the inner device portion is smaller at the outer axial end of the projection than at the inner axial end of the projection,

    Sealing device.
15. The method of claim 14,

    The radial distance between the inner radial end surface and the opposing surface of the protrusion becomes smaller as it goes outward in the axial direction,

    Sealing device.
16. The method of claim 15,

    The inner radial end surface of the projection includes an inclined surface extending inclined in a direction between the outer axial direction and the inner radial direction at the inner axial end,

    Sealing device.
17. The method of claim 13,

    The opposite surface facing the protrusion of the inner device portion includes an inclined opposite surface inclined in a direction between the inner axial direction and the inner radial direction,

    The inclined facing surface is disposed at a position spaced apart in the radial direction from the protruding end of the projection,

    Sealing device.
18. The method of claim 17,

    The inner device portion includes an inner sealing member covering at least a portion of the inner frame surface,

    The inclined facing surface is formed on the inner sealing member,

    Sealing device.
19. The method of claim 13,

    A circumferential distance between two protrusions adjacent to each other in the circumferential direction among the plurality of protrusions is smaller at an outer axial end of the plurality of protrusions than at an inner axial end of the plurality of protrusions,

    Sealing device.
20. Paddle;

    An inner ring portion disposed in an inner radial direction of the outer ring portion and configured to be rotatable relative to the outer ring portion;

    A bearing disposed between the outer ring portion and the inner ring portion; And

    A sealing device according to any one of claims 1 to 19,

    Wheel bearing assembly.

Images