KR20160097064A - Sealing cover and wheel bearing assembly including same - Google Patents

Abstract

The present invention relates to a sealing cover and a wheel bearing assembly, capable of improving sealing performance. According to an embodiment of the present invention, the wheel bearing assembly includes: a hub of which axial outer side is combined with a wheel and of which axial inner side includes a step part; an outer wheel surrounding the outer surface of the hub, and combined with a vehicle body; an inner wheel inserted into the step part of the hub; electric bodies interposed between the hub and the outer wheel and between the inner wheel and the outer wheel; and a sealing cover placed inside to prevent foreign substances from flowing in a radial direction of the outer wheel, and including a fixing ring, combined with the outer wheel to be fixed to the vehicle body, and a rotary ring combined with the hub to rotate with the hub.

Description

[0001] SEILING COVER AND WHEEL BEARING ASSEMBLY INCLUDING SAME [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal cover and a wheel bearing assembly having the same, and more particularly, to a seal cover and a wheel bearing assembly having the same.

Generally, a bearing is a device mounted between a rotating element and a non-rotating element to facilitate rotation of the rotating element.

Bearings can be distinguished by sliding bearings and rolling bearings. Rolling bearings reduce the friction by rolling contact between the inner and outer rings through rolling elements

Such rolling bearings are used in various devices. In particular, rolling bearings are mainly used for wheel bearing assemblies that transmit the power of the engine to the wheels for running the vehicle. The wheel bearings are installed between the wheel shafts and the wheels so that power loss is minimized while the power of the engine is transmitted to the ground through the wheels of the vehicle. That is, the wheel bearing rotatably connects the wheel, which is a rotating element, to the vehicle body, which is an element that does not rotate.

The wheel bearing includes an inner ring (and / or hub) connected to one of the wheels or the vehicle body, an outer ring connected to the other one of the wheel or the vehicle body, and a rolling member having a plurality of inner rings interposed therebetween. Further, the plurality of rolling elements are arranged with a constant interval by a retainer.

The wheel bearing assembly is divided into a driving wheel wheel bearing assembly that transmits power generated by the engine and a driven wheel wheel bearing assembly that does not transmit driving force. A drive shaft that transmits the power of the engine is connected to the wheel bearing of the drive wheel.

The wheel bearing assembly further includes a sealing member mounted between the hub and the outer ring or between the inner ring and the outer ring to prevent foreign matter such as dust or moisture from penetrating into the space in which the rolling element is disposed. In addition, the sealing member prevents leakage of the lubricant that smoothes the motion of the rolling member. Further, in the case of a follower wheel bearing assembly in which the drive shaft is not connected among the wheel bearing assemblies, a sealing cap, which is coupled to the outer ring and closes the inner surface of the wheel bearing assembly to prevent foreign matter from entering into the wheel bearing assembly, As shown in FIG.

However, in the case of a wheel-wheel bearing assembly in which the drive shaft of the wheel bearing assembly is connected, it is impossible to apply the sealing cap by connection with the drive shaft. That is, the driving wheel-wheel bearing assembly relies on the sealing only for the sealing member mounted between the hub and the outer ring or between the inner ring and the outer ring. Thus, the sealing performance of the drive wheel bearing assembly may be lower than the sealing performance of the follower wheel bearing assembly.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a sealing cover and a wheel bearing assembly having the same, which can improve sealing performance.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a sealing cover comprising: a hub having a stepped surface formed on an inner side thereof and a flange formed on the outer side thereof for mounting a wheel; an outer ring disposed to surround the outer peripheral surface of the hub; The wheel bearing assembly is disposed inside the wheel bearing assembly so as to prevent foreign matter from being introduced into the wheel bearing assembly including an inner ring which is press-fitted to the rear surface, a hub between the hub and the outer ring, and a rolling member interposed between the inner ring and the outer ring A stationary ring coupled to the outer ring to be fixed to the vehicle body together with the outer ring; And a rotating ring coupled to the hub to rotate with the hub.

Wherein the stationary ring includes: an outer ring mounting portion having a predetermined length in an axial direction and an inner circumferential surface thereof coupled to the outer ring; And a sealing portion which is bent and extends radially inward from the outer ring mounting portion so as to surround the outer ring and the inner ring.

Wherein the rotary ring extends radially outward from the center of the hub and extends in the axial direction while being bent toward the inner ring while surrounding the orbital forming portion of the hub and having an inner circumferential surface coupled to the orbital forming portion of the hub, ; And a cover portion bent and extending radially outward from the hub mounting portion bent toward the inner ring and arranged to face the sealing portion.

An outer lip provided on the cover portion to protrude from the cover portion toward the sealing portion; And a plurality of inner ribs provided on the cover portion to protrude from the cover portion toward the sealing portion and disposed relatively radially inward relative to the outer lip.

Three inner ribs may be formed.

The outer lip and the inner lip may contact the sealing portion.

The outer lip and the inner lip may be formed of a rubber material.

The inner lip may protrude obliquely outward in the radial direction from the cover portion toward the sealing portion.

The rotary ring may further include a through hole through which the drive shaft inserted into the hollow of the hub passes.

The diameter of the through hole may be a size corresponding to the diameter of the drive shaft.

The cover portion may be spaced a certain distance in the axial direction from the inside of the sealing portion.

The orbital forming portion of the hub may be press-fitted into the inner circumferential surface of the hub mounting portion bent toward the inner ring so that the rotary ring is engaged with the hub.

The sealing portion may be spaced a certain distance in the axial direction from the inner side of the inner ring.

The inner side of the outer ring may be press-fitted into the inner peripheral surface of the outer ring mounting portion so that the stationary ring is coupled to the outer ring.

The rotation ring may further include a locking protrusion protruding radially inward from the inner circumferential surface of the hub mounting portion so as to be caught by the press-fit forming portion on the inner circumferential surface of the hub mounting portion.

A plurality of the latching jaws may be formed at regular intervals along the circumference of the hub mounting portion.

A wheel bearing assembly according to an embodiment of the present invention includes: a hub having an axially outer side coupled to a wheel and a stepped portion formed axially inward; An outer ring surrounding the outer circumferential surface of the hub and engaged with the vehicle body; An inner ring which is press-fitted into a stepped portion of the hub; A rolling member interposed between the hub and the outer ring and between the inner ring and the outer ring; And a rotating ring which is disposed inside to prevent foreign matter from entering the radially inner side of the outer ring and which is coupled to the outer ring so as to be fixed to the vehicle body together with the outer ring and coupled to the hub to rotate together with the hub, And a sealing cover (not shown).

Wherein the stationary ring includes: an outer ring mounting portion having a predetermined length in an axial direction and an inner circumferential surface thereof coupled to the outer ring; And a sealing portion extending from the outer ring mounting portion to extend radially inward from the outer ring mounting portion to surround the outer ring and the inner ring.

Wherein the rotary ring extends radially outward from the center of the hub and extends in the axial direction while being bent toward the inner ring while surrounding the orbital forming portion of the hub and having an inner circumferential surface coupled to the orbital forming portion of the hub, ; A cover portion bent and extending radially outward from the hub mounting portion bent toward the inner ring, and arranged to face the sealing portion; And a through hole through which the drive shaft inserted into the hollow of the hub passes.

Wherein the sealing cover includes: an outer lip provided on the cover portion so as to protrude from the cover portion toward the sealing portion; And a plurality of inner ribs provided on the cover portion to protrude from the cover portion toward the sealing portion and disposed relatively radially inward relative to the outer lip.

The outer lip and the inner lip may contact the sealing portion.

The inner lip may protrude obliquely outward in the radial direction from the cover portion toward the sealing portion.

The cover portion may be spaced a certain distance in the axial direction from the inside of the sealing portion.

The sealing portion may be spaced a certain distance in the axial direction from the inner side of the inner ring.

The rotation ring may further include a locking protrusion protruding radially inward from the inner circumferential surface of the hub mounting portion so as to be caught by the press-fit forming portion on the inner circumferential surface of the hub mounting portion.

A plurality of the latching jaws may be formed at regular intervals along the circumference of the hub mounting portion.

The rotation ring may further include a deformation preventing hole formed at a predetermined interval along the circumference of the hub mounting portion, which is pierced from an outer circumferential surface to an inner circumferential surface of the hub mounting portion and is paired with the engagement protrusion.

As described above, according to the embodiment of the present invention, the sealing performance can be improved so that the sealing cap can be connected to the drive shaft, and the sealing performance corresponding to the sealing cap can be secured.

1 is a configuration diagram of a wheel bearing assembly according to an embodiment of the present invention.
2 is an enlarged view showing a configuration of a sealing cover according to an embodiment of the present invention.
3 is a configuration diagram of a rotating ring of a sealing cover according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a wheel bearing assembly according to an embodiment of the present invention.

1, a wheel bearing assembly 1 according to an embodiment of the present invention includes a hub 10, an inner ring 20, an outer ring 30, a rolling member 50, and a sealing member 40 .

The hub 10 is formed in a hollow cylindrical shape such as a cylinder. Further, the hub 10 is engaged with a wheel (not shown) of the vehicle.

A flange 12 protruding radially outward is formed at one side of the hub 10, and a pilot 16 protruding in the axial direction of the hub is formed. A bolt hole 14 is formed in the flange 12 so that the wheel of the vehicle can be coupled to the hub 10 by a coupling means such as a bolt and the pilot 16 is inserted into the hub 10, When the wheel is mounted on the wheel, it is inserted into the wheel to guide the wheel.

A stepped portion 18 is formed on the other side of the hub 10 and the forming portion 19 extends in the axial direction from the stepped portion 18. The forming section 19 extends in a straight line parallel to the axial direction of the hub 10 before orbital forming, but is bent outward along the radial direction by orbital forming. A hub orbit surface 17 is formed on the outer circumferential surface of the hub 10 between the stepped portion 18 and the flange 12. The hub orbital surface 17 is an orbital surface of the rolling member 50 formed for rolling contact of the rolling member 50 to be described later.

One side of the hub 10 is outside the hub 10 near the wheel and the other side of the hub 10 is inside the hub 10 close to the vehicle body. In the following description, one side and the other side, the outside side and the inside side of the components constituting the wheel bearing assembly 1 refer to a part of the hub 10 in the same direction as one side and the other side, the outside side and the inside side, respectively.

The inner ring 20 is formed in a hollow cylindrical shape so as to be pressed into the stepped portion 18 of the hub 10. That is, the inner ring 20 is coupled to the outer peripheral surface of the hub 10 on which the step portion 18 is formed. An inner ring raceway surface 28 is formed on the outer circumferential surface of the inner ring 20. The inner ring raceway surface 28 is the raceway surface of the rolling member 50 formed for rolling contact of the rolling member 50 to be described later.

The outer ring 30 is formed in a hollow cylindrical shape so as to surround the outer circumferential surface of the hub 10. That is, the outer ring 30 is formed with a hollow through which the hub 10 and the inner ring 20 are inserted along the central axis. An outer ring first raceway surface 37 and an outer ring second raceway surface 38 are formed on inner circumferential surfaces of the outer ring 30 and opposed to the hub raceway surface 17 and the inner ring raceway surface 28, respectively. Here, the first and second outer race surfaces 37 and 38 are the raceway surfaces of the rolling member 50 formed for rolling contact of the rolling member 50 to be described later. Further, a flange 32 protruding radially outward is formed on a part of the outer peripheral surface of the outer ring 30. A bolt hole (14) is formed in the flange (32) so that the outer ring (30) can be coupled to the vehicle body by a coupling means such as a bolt.

A plurality of rolling elements 50 are disposed between the hub 10 and the outer ring 30 and / or between the inner ring 20 and the outer ring 30. The rolling member 50 is disposed between the hub raceway surface 17 and the outer race first raceway surface 37 and between the inner race race surface 28 and the outer race second raceway surface 38 Respectively. That is, the plurality of rolling elements 50 may be arranged in a double-row including the first rolling element row 52 and the second rolling element row 54. The first rolling member train 52 is disposed between the hub 10 and the outer race 30, that is, between the hub raceway surface 17 and the outer race first raceway surface 37, 2 rolling element row 54 is disposed between the inner ring 20 and the outer ring 30, that is, between the inner ring raceway surface 28 and the outer ring second raceway surface 38. [ Meanwhile, the rolling member 50 may have various shapes depending on the trajectory. For example, the rolling member 50 may have a ball shape or a cylindrical shape. Further, the cylindrical rolling body 50 may be tapered so that the diameter gradually decreases along the longitudinal direction. The plurality of rolling members 50 maintain a constant gap between the adjacent rolling members 50 by the retainer 60. [

The sealing member 40 is provided to prevent foreign substances such as dust and moisture from entering the rolling member 50 and leakage of the lubricant that smoothes the movement of the rolling member 50, Is mounted between the flange (12) of the hub (10) and the outer ring (30).

The configuration of the wheel bearing assembly 1 including the hub 10, the inner ring 20, the outer ring 30, the rolling member 50, and the sealing member 40 is not limited to those skilled in the art (Hereinafter, referred to as a person skilled in the art), the detailed description will be omitted.

The wheel bearing assembly 1 according to the embodiment of the present invention further includes a sealing cover 100.

The sealing cover 100 is provided inside the hub 10 to prevent foreign matter from entering the wheel bearing assembly 1 from the vehicle body. In addition, the sealing cover 100 includes a stationary ring 110 and a rotating ring 120.

The stationary ring 110 is formed in a ring shape. The fixed ring 110 is coupled to the outer ring 30 while surrounding the outer ring 30 and the inner ring 20 from the inside of the outer ring 30. That is, in order to prevent foreign substances such as dust and moisture from entering the rolling body 50 and leakage of lubricant that smoothes the motion of the rolling body 50, Is disposed so as to cover a space between the inside of the outer ring (30) and the inside of the inner ring (20). Further, the stationary ring 110 is mounted apart from the inner ring 20.

The rotary ring 120 is formed in a ring shape. The rotating ring 120 is coupled to the hub 10 while enclosing the hub 10, the inner ring 20 and the stationary ring 110 from the inside of the hub 10. That is, the rotary ring 120 is disposed so as to cover the space between the inner side of the outer ring 30 and the inner side of the inner ring 20 from the inner side relative to the fixed ring 110 again. Further, the rotary ring 120 is mounted while being spaced apart from the inner ring 20 and the stationary ring 110.

The sealing cover 100 is formed of a hard synthetic material or a metal material such as plastic. However, the present invention is not limited to this, and the sealing cap 100 may be formed of various materials that can be coupled to the outer ring 30 and the hub 10.

2 is an enlarged view showing a configuration of a sealing cover according to an embodiment of the present invention.

1 and 2, the fixing ring 110 of the sealing cover 100 includes an outer ring mounting portion 112 and a sealing portion 114, and a rotary ring (not shown) of the sealing cover 100 120 includes a hub mounting portion 122, a cover portion 124, a through hole 125, an outer lip 126, and an inner lip 127.

The outer ring mounting portion 112 has a predetermined length in the axial direction of the outer ring 30 and is mounted on the outer peripheral surface of the outer ring 30 from the inside. The fixing ring 110 is fixed to the vehicle body together with the outer ring 30 by being coupled to the outer ring 30 by pressing the inner side of the outer ring 30 into the inner peripheral surface of the outer ring mounting portion 112. 1 and 2 show the outer ring 30 which is press-fitted into the inner circumferential surface of the outer ring mounting portion 112. However, the outer ring mounting portion 112 may be press-fitted into the inner circumferential surface of the outer ring 30.

The sealing portion 114 is bent and extends radially inward from the outer ring mounting portion 112 so as to surround the inner side of the outer ring 30 and the inner side of the inner ring 20. The sealing portion 114 is spaced from the inner side of the inner ring 20 by a predetermined distance in the axial direction. The distance that the sealing portion 114 is spaced from the inner ring 20 can be set by a person skilled in the art so as to prevent the interference of the sealing portion 114 with respect to the rotation of the inner ring 20 while ensuring the sealing performance .

The hub mounting portion 122 extends radially outward from the center of the hub 10 and extends in the axial direction while being bent toward the inner ring 20 while surrounding the forming portion 19. The hub mounting portion 122 is mounted on the forming portion 19 of the hub 10. The rotating ring 120 is coupled to the hub 10 by press-fitting the forming portion 19 into the inner circumferential surface of the hub mounting portion 122 bent toward the inner ring 20, And rotates together with the inner ring 20.

The cover portion 124 is bent and extended radially outward from the hub mounting portion 122 bent toward the inner ring 20. The outer surface of the cover portion 124 is disposed to face the inner surface of the sealing portion 114 of the stationary ring 110. Further, the cover portion 124 is spaced a predetermined distance from the inside of the sealing portion 114 in the axial direction. The distance that the cover portion 124 is spaced from the inside of the sealing portion 114 may be adjusted by a person skilled in the art to ensure the sealing performance while preventing the sealing portion 114 from interfering with the rotation of the rotation ring 120 Can be set.

The through hole 125 is a hole formed radially inward of the hub mounting portion 122 so that a drive shaft (not shown) can be inserted into the hollow of the hub 10. [ Here, the diameter of the through-hole 125 may be formed to have a size corresponding to the diameter of the drive shaft so that airtightness is maintained between the rotation ring 120 and the drive shaft, and may be set by a person skilled in the art .

The outer lip 126 may be provided at an end of the cover 124 extending radially outward. The outer lip 126 protrudes from the cover portion 124 of the rotary ring 120 toward the sealing portion 114 of the fixing ring 110. Further, the outer lip 126 may be in contact with the sealing portion 114. Meanwhile, the outer lip 126 and the inner lip 127 may be formed of a rubber material.

The inner lip 127 is provided on the cover portion 124 and is arranged radially inward relative to the outer lip 126. The inner lip 127 protrudes radially outwardly from the cover portion 124 of the rotary ring 120 toward the sealing portion 114 of the fixing ring 110. Further, the inner lip 127 may be in contact with the sealing portion 114. Here, a plurality of inner ribs 127 may be provided along the radial direction, and three inner ribs 127 are shown in FIGS.

3 is a configuration diagram of a rotating ring of a sealing cover according to an embodiment of the present invention. 3 is a view of the rotary ring 120 viewed from the wheel side.

1 to 3, the rotating ring 120 of the sealing cover 100 further includes a stopping jaw 128 and a deformation preventing hole 129.

The engaging protrusion 128 protrudes radially inward from the inner circumferential surface of the hub mounting portion 122. The engaging protrusion 128 is formed to be engaged with the forming portion 19 press-fitted into the inner peripheral surface of the hub mounting portion 122 so that the rotation ring 120 is prevented from being detached from the forming portion 19 Function. Meanwhile, the rotary ring 120 may be separated from the forming unit 19 by a separate tool that releases the engagement of the engaging step 128 caught by the forming unit 19.

The deformation preventing hole 129 is a hole drilled from the outer peripheral surface to the inner peripheral surface of the hub mounting portion 122. The deformation preventing hole 129 may be formed in the bent portion of the hub mounting portion 122. Further, the deformation preventing hole 129 may be formed in the hub mounting portion 122, which may be generated when the hub mounting portion 122 is fitted to the forming portion 19 and the locking protrusion 128 is pushed outward in the radial direction To prevent the deformation of the base plate. That is, one stopper 128 is disposed in a pair with one deformation preventing hole 129.

A plurality of the locking protrusions 128 and the deformation preventing holes 129 are formed at regular intervals along the circumference of the hub mounting portion 122. Meanwhile, the locking protrusions 128 and the deformation preventing holes 129 may be equally spaced. 3, three hooks 128 and deformation-preventing holes 129 formed radially and arranged at intervals of 120 degrees are shown, but are not limited thereto.

As described above, according to the embodiment of the present invention, the sealing performance can be improved so that the sealing cap can be connected to the drive shaft, and the sealing performance corresponding to the sealing cap can be secured.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

10: hub 12, 32: flange
14, 34: bolt hole 16: pilot
17: hub orbital plane 18: stepped portion
19: forming section
20: inner ring 28: inner ring raceway
30: outer ring 37: outer race first raceway surface
38: outer race second raceway surface
40: sealing member
50: rolling member 52: first rolling member column
54: second rolling element column
100: Sealing cover
110: Fixing ring 112: Outer ring mounting part
114: sealing part
120: rotation ring 122: hub mount
124: cover part 125: through hole
126: outer lip 127: inner lip
128: jaw jaw 129: deformation preventing hole

Claims (25)

A hub having a stepped surface formed on its inner side and a flange formed on its outer side to mount the wheel, an outer ring disposed to surround the outer circumferential surface of the hub, an inner ring pressed into the stepped surface of the hub, A seal cover disposed inside the wheel bearing assembly to prevent foreign matter from being introduced into a wheel bearing assembly including a rolling member interposed between the outer rings,
A fixed ring coupled to the outer ring to be fixed to the vehicle body together with the outer ring; And
A rotating ring coupled to the hub to rotate with the hub;
≪ / RTI >
Wherein the stationary ring comprises:
An outer ring mounting portion having a predetermined length in the axial direction and having an inner circumferential surface coupled to the outer ring; And
A sealing portion which is bent and extends radially inward from the outer ring mounting portion so as to surround the outer ring and the inner ring;
Lt; / RTI >
The rotating ring
A hub mounting portion extending radially outward from the center of the hub and extending in the axial direction while being bent toward the inner ring while surrounding the orbital forming portion of the hub, the inner circumferential surface of the hub mounting portion being coupled to the orbital forming portion of the hub; And
A cover portion bent and extending radially outward from the hub mounting portion bent toward the inner ring, and arranged to face the sealing portion;
Is formed on the inner surface of the sealing cover. The method according to claim 1,
An outer lip provided on the cover portion to protrude from the cover portion toward the sealing portion; And
A plurality of inner ribs provided on the cover portion to protrude from the cover portion toward the sealing portion, the plurality of inner ribs being disposed radially inward relative to the outer lip;
Further comprising a sealing cover (40). 3. The method of claim 2,
Wherein three inner ribs are formed. 3. The method of claim 2,
Wherein the outer lip and the inner lip are in contact with the sealing portion. 3. The method of claim 2,
Wherein the outer lip and the inner lip are made of a rubber material. 3. The method of claim 2,
And the inner lip projects obliquely outward in the radial direction from the cover portion toward the sealing portion. The method according to claim 1,
Wherein the rotary ring further defines a through-hole through which a drive shaft inserted into the hollow of the hub passes. 8. The method of claim 7,
And the diameter of the through hole is formed to be a size corresponding to the diameter of the drive shaft. The method according to claim 1,
And the cover portion is spaced a predetermined distance in the axial direction from the inside of the sealing portion. The method according to claim 1,
And the orbital forming portion of the hub is press-fitted into the inner circumferential surface of the hub mounting portion bent toward the inner ring so that the rotary ring is engaged with the hub. The method according to claim 1,
And the sealing portion is spaced from the inner side of the inner ring by a predetermined distance in the axial direction. The method according to claim 1,
And the inner side of the outer ring is press-fitted into the inner peripheral surface of the outer ring mounting portion so that the fixing ring is engaged with the outer ring. 11. The method of claim 10,
Wherein the rotary ring further has a locking protrusion protruding radially inward from the inner circumferential surface of the hub mounting portion so as to be caught by the press-fit forming portion on the inner circumferential surface of the hub mounting portion. 14. The method of claim 13,
Wherein a plurality of the latching jaws are formed at regular intervals along the circumference of the hub mounting portion. A hub axially outwardly coupled to the wheel and having a stepped portion in the axial direction;
An outer ring surrounding the outer circumferential surface of the hub and engaged with the vehicle body;
An inner ring which is press-fitted into a stepped portion of the hub;
A rolling member interposed between the hub and the outer ring and between the inner ring and the outer ring; And
A retaining ring disposed on the inside to prevent foreign matter from entering the radially inner side of the outer ring, a retaining ring coupled to the outer ring to be fixed to the vehicle body together with the outer ring, and a rotating ring coupled to the hub to rotate together with the hub A sealing cover;
≪ / RTI > 16. The method of claim 15,
Wherein the stationary ring comprises:
An outer ring mounting portion having a predetermined length in the axial direction and having an inner circumferential surface coupled to the outer ring; And
A sealing portion which is bent and extends radially inward from the outer ring mounting portion so as to surround the outer ring and the inner ring;
≪ / RTI > 17. The method of claim 16,
The rotating ring
A hub mounting portion extending radially outward from the center of the hub and extending in the axial direction while being bent toward the inner ring while surrounding the orbital forming portion of the hub, the inner circumferential surface of the hub mounting portion being coupled to the orbital forming portion of the hub;
A cover portion bent and extending radially outward from the hub mounting portion bent toward the inner ring, and arranged to face the sealing portion; And
A through hole through which a drive shaft inserted into the hollow of the hub passes;
≪ / RTI > 18. The method of claim 17,
Wherein the sealing cover
An outer lip provided on the cover portion to protrude from the cover portion toward the sealing portion; And
A plurality of inner ribs provided on the cover portion to protrude from the cover portion toward the sealing portion, the plurality of inner ribs being disposed radially inward relative to the outer lip;
Further comprising: a second bearing assembly having a first bearing surface and a second bearing surface. 19. The method of claim 18,
Wherein the outer lip and the inner lip contact the sealing portion. 20. The method of claim 19,
Wherein the inner lip projects radially outwardly toward the sealing portion from the cover portion. 18. The method of claim 17,
Wherein the cover portion is spaced a certain distance axially from the inside of the sealing portion. 18. The method of claim 17,
Wherein the sealing portion is spaced a certain distance axially from the inside of the inner ring. 18. The method of claim 17,
Wherein the rotary ring further comprises a locking protrusion protruding radially inwardly from an inner circumferential surface of the hub mounting portion so as to be caught by the press-fit forming portion on the inner circumferential surface of the hub mounting portion. 24. The method of claim 23,
Wherein a plurality of the latching jaws are formed at regular intervals along the circumference of the hub mounting portion. 25. The method of claim 24,
Wherein the rotation ring further comprises a deformation preventing hole formed in a circumferential direction of the hub mounting portion and pierced from an outer circumferential surface to an inner circumferential surface of the hub mounting portion, .

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