KR101394169B1 - Sealing apparatus of wheel bearing - Google Patents

Abstract

The present invention relates to a sealing device for a wheel bearing capable of improving sealing performance.
A sealing device for a wheel bearing according to an embodiment of the present invention is a sealing device for a wheel bearing that includes an outer ring mounted on an inner circumferential surface of an outer ring in a wheel bearing, an inner ring mounted on an outer circumferential surface of the inner ring, and a sealing member disposed between the outer ring and the inner ring. An apparatus, comprising: an outer ring mounting portion formed on the outer rail to be mounted on the outer ring; An outer iron extension portion which is bent and extended in the outer ring mounting portion; An inner ring mounting portion formed on the inner ring so as to be mounted on the inner ring and facing the outer ring mounting portion; An inner iron first extending portion that is bent and extended from the inner wheel mounting portion and faces the outer iron extension portion; And an inferior second extension portion that is bent from the first inwardly extending portion to the outwardly extending portion and extends in the axial direction to form a first predetermined angle; . ≪ / RTI >

Description

[0001] SEALING APPARATUS OF WHEEL BEARING [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel bearing sealing device, and more particularly, to a wheel bearing sealing device capable of improving sealing performance.

Generally, a bearing is a device mounted between a rotating element and a non-rotating element to facilitate rotation of the rotating element. Currently, various bearings such as roller bearings, tapered bearings, and needle bearings are used.

Wheel bearings are one type of such bearings, which rotatably connect a wheel, which is a rotating element, to a vehicle body, which is a non-rotating element. 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 interposed between the outer ring and the inner ring.

These wheel bearings are basically mounted on the wheels of the vehicle, and thus are exposed to foreign substances such as dust and moisture. If such foreign matter penetrates into the interior of the wheel bearing, particularly the portion where the rolling element is mounted, the raceway, which is a polishing surface, may be damaged. Such a damaged raceway may cause noise and vibration during operation of the wheel bearing and shorten the life of the wheel bearing. Therefore, a sealing device is mounted at one or both ends of the wheel bearing to prevent foreign matter from entering from the outside.

The sealing device of the wheel bearing generally comprises an outer ring mounted on the inner circumferential surface of the outer ring of the wheel bearing and an inner ring mounted on the outer circumferential surface of the inner ring and a sealing member disposed therebetween for sealing. Further, the lips formed in the sealing member mounted on one of the outer frame and the inner frame are brought into contact with the other of the outer frame and the inner frame, so that sealing is performed. On the other hand, when the contact surface of the lip is widened or the contact portion is increased, the drag torque is increased by the operation of the wheel bearing, so that the fuel consumption can be reduced. Furthermore, the contact surfaces of the lips may be worn out, thereby lowering the sealing performance.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a sealing device for a wheel bearing capable of reducing drag torque while improving sealing performance.

It is another object of the present invention to provide a sealing device for a wheel bearing which can prevent deterioration of sealing performance due to abrasion of contact portions of the ribs by reducing contact portions of the ribs.

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 device for a wheel bearing according to an embodiment of the present invention, comprising: an outer ring mounted on an inner circumferential surface of an outer ring in a wheel bearing; a inner ring mounted on an outer circumferential surface of the inner ring; And an outer ring mounting portion formed on the outer ring to be mounted on the outer ring; An outer iron extension portion which is bent and extended in the outer ring mounting portion; An inner ring mounting portion formed on the inner ring so as to be mounted on the inner ring and facing the outer ring mounting portion; An inner iron first extending portion that is bent and extended from the inner wheel mounting portion and faces the outer iron extension portion; And an inferior second extension portion that is bent from the first inwardly extending portion to the outwardly extending portion and extends in the axial direction to form a first predetermined angle; . ≪ / RTI >

And an inwardly sloping surface formed on an outer circumferential surface of the second inwardly extending portion to form a second set angle with respect to the axial direction.

The inward rail inclined surface may be inclined so that its outer diameter gradually decreases along the outboard direction.

The second set angle of the second inward-facing second extension may be less than 20 degrees.

The second inward-facing second extension portion may be formed so as to be inclined such that its radius gradually increases along the outboard direction.

And the lip formed on the sealing member may not contact the inner second extension portion.

The sealing member provided between the outer ring mounting portion and the second inward-facing second extending portion includes: a protrusion protruding toward the second inward-facing second extending portion to prevent foreign matter from penetrating between the outer-ring mounting portion and the inward-facing second extending portion; And a sealing member inclined surface corresponding to the inboard surface and forming a third set angle in the axial direction; And a lip may not be formed on the sealing member provided between the outer ring mounting portion and the second resilient second extension portion.

The protrusion may be formed at the inboard end portion of the sealing member provided between the outer ring mounting portion and the inward second extending portion.

The inclined surface of the sealing member may be inclined so that its inner diameter gradually decreases along the outboard direction.

The third set angle of the sealing member slope may be less than 20 degrees.

The distance from the center axis of the wheel bearing to the outboard direction end of the inclined surface of the sealing member may be smaller than the minimum inner diameter of the protrusion.

The minimum inner diameter of the projection may be greater than the distance from the central axis of the wheel bearing to the inboard end of the inferior slope.

The inward rail inclined surface and the inclined surface of the sealing member may be spaced apart from each other by a predetermined distance.

The distance from the inboard direction of the first inwardly extending portion to the outboard direction end of the second inwardly extending portion extends from the inboard direction of the inwardly extending first inward portion to the sealing member mounted on the outwardly extending portion, Lt; / RTI >

As described above, according to the embodiment of the present invention, it is possible to prevent the lowering of the sealing performance due to the abrasion of the contact portions of the ribs and reduce the drag torque by reducing the contact portions of the outer or inner iron and the lips.

Further, as the drag torque is reduced, the fuel consumption can be improved.

1 is a configuration diagram of a wheel bearing according to an embodiment of the present invention.
Fig. 2 is a configuration diagram of a sealing device for a wheel bearing in which the portion "A" in Fig. 1 is enlarged.
Fig. 3 is a block diagram of a sealing device for a wheel bearing in which a part of the sealing device of Fig. 2 is further enlarged.
FIG. 4 is a view showing a state in which foreign substances are introduced and discharged in a sealing device for a wheel bearing 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 according to an embodiment of the present invention.

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

The hub 20 is coupled to a wheel (not shown). In addition, the hub 20 includes a flange 22 integrally formed with the wheel. Further, the flange 22 may be formed in a disk shape extending along the circumferential direction of the hub 20. That is, the flange 22 is coupled to the wheel by a coupling means such as a coupling bolt, so that the hub 20 can be coupled to the wheel.

The outer ring 40 is formed to surround the outer circumferential surface of the hub 20 and the outer circumferential surface of the hub 20 and the inner circumferential surface of the outer ring 40 are spaced apart from each other. The outer ring 40 is coupled to a vehicle body (not shown).

Generally, the inside of a vehicle body is called an inboard, and the outside of a vehicle body is called an outboard. In this specification, the direction toward the wheel coupled to the hub 20 is defined as an outboard direction, and the direction toward the vehicle body coupled with the outer ring 40 is referred to as an inboard direction .

The rolling body 50 is interposed between the outer circumferential surface of the spaced hub 20 and the inner circumferential surface of the outer ring 40 to rotatably connect the hub 20 and the outer ring 40. In addition, a plurality of the rolling elements 50 may be provided. Furthermore, the grease 60 can be filled in the space in which the rolling member 50 is interposed so that the wheel bearing 10 can be smoothly driven.

The inner ring 30 surrounds the outer circumferential surface of the hub 20 at one end of the hub 20. Further, the inner ring (30) is in rolling contact with at least one of the rolling elements (50).

Generally, the hub and the inner ring of the wheel bearing are connected to one of the wheels or the vehicle body, and the outer ring is connected to the wheel or another one of the vehicle and not connected to the hub and the inner ring. 1, an outer ring 40 connected to a vehicle body (not shown) and a hub 20 connected to a wheel (not shown) are shown, but the present invention is not limited thereto. The structure of the wheel bearing 10 will be apparent to those skilled in the art (hereinafter, those skilled in the art will be apparent to those skilled in the art).

The wheel bearing (10) further includes a sealing device (100). Further, the sealing device 100 is provided with both ends of a space in which the rolling member 50 is interposed. In particular, at least one of the sealing devices 100 is disposed between the inner circumferential surface of the outer ring 40 and the outer circumferential surface of the inner ring 30. Further, the sealing device 100 prevents leakage of the grease 60 and penetration of foreign matter.

Fig. 2 is a configuration diagram of a sealing device for a wheel bearing in which the portion "A" in Fig. 1 is enlarged.

2, a wheel bearing sealing apparatus 100 according to an embodiment of the present invention includes an outer ring 120, an inner ring 110, and a sealing member 130.

The outer ring 120 includes an outer ring mounting portion 122 and an outer ring extension portion 124.

The outer ring mounting portion 122 is mounted at one end of the inner peripheral surface of the outer ring 40. Here, the one end is a surface facing the outer circumferential surface of the inner ring 30. The outer ring extension portion 124 is bent at one end of the outer ring mounting portion 122 and extends integrally. That is, the outer frame 120 may be a flat plate having a single folded end and a constant thickness. Meanwhile, the outer frame 120 may be formed of a metal material.

The inner ring 110 includes an inner ring mounting portion 112, an inner first extension portion 114, and an inner second extension portion 116.

The inner ring mounting portion 112 is mounted on the outer peripheral surface of the inner ring 30. That is, the inner ring mounting portion 112 may have a shape facing the outer ring mounting portion 122. Further, the inner-ring first extension portion 114 is bent at one end of the inner-ring mounting portion 112 and extends integrally. That is, the first end-piece extension portion 114 may have a shape facing the outer-side end portion extension portion 124. Further, the second inward-facing second extending portion 116 is bent at one end of the first inward-facing first extending portion 114 and extends integrally. That is, the second inward-facing second extension portion 116 may extend toward the outer-side extension portion 124. On the other hand, the base metal 110 may be a plate-like plate having a certain thickness with two bending stages. That is, the base steel (110) may be in the shape of a " U "

The sealing member 130 is provided in an inner space formed between the outer member 120 and the inner member 110. Further, the sealing member 130 is engaged with the outer shell 120. Further, the sealing member 130 includes at least one lip 132.

The lip 132 protrudes from the sealing member 130 coupled to the outer iron 120 and extends toward the inner iron 110 and contacts the inner iron 110.

Accordingly, the inner space provided with the sealing member 130 can be divided into a plurality of spaces by the ribs 132. [ In FIG. 2, the inner space is partitioned into a first space 140 and a second space 142 by two ribs 132. Further, in order for foreign matter outside the wheel bearing 10 to penetrate into the space filled with the grease 60, the first space 140 and the second space 142 must be sequentially passed through. That is, a plurality of spaces formed by the ribs 132 should pass through. Further, in order for the grease 60 to leak to the outside, the second space 142 and the first space 140 must be sequentially passed through. That is, the penetration of the foreign matter and the leakage of the grease (60) are caused by passing through at least one lip (132) and the contact portion of the inner iron (110).

Fig. 3 is a block diagram of a sealing device for a wheel bearing in which a part of the sealing device of Fig. 2 is further enlarged. In Fig. 3, first, second and third setting angles h, f and g are set angles with respect to the axis X direction.

As shown in Fig. 3, the inferior second extension portion 116 extends obliquely at a first set angle h. Referring to the above description and FIG. 1, it can be seen that the second extensions 116 extend in the outboard direction. Also, the second inner extension portion 116 is formed in such a shape that its radius gradually increases along the outboard direction by the first setting angle h. Further, the outer peripheral surface 117 of the inner peripheral second extension portion and the inner peripheral surface 119 of the inner peripheral second extending portion have the first set angle h.

On the other hand, the outer peripheral surface 117 of the inner second extension portion includes an inner iron inclined surface 118. The inward iron inclined surface 118 refers to a surface having a second set angle f from a predetermined portion of the outer peripheral surface 117 of the second inward portion. That is, the outer circumferential surface 117 of the inner second extension portion is formed in such a shape that the outer diameter gradually decreases along the outboard direction from the predetermined portion by the second setting angle f.

The sealing member 130 provided between the inner second extension portion 116 and the outer ring mounting portion 122 includes the protrusion 134 and the sealing member inclined surface 136.

The protrusion 134 is formed so as to protrude from the inboard end portion of the outer ring mounting portion 122 toward the second inward iron extension portion 116 to prevent the penetration of foreign matter.

The sealing member inclined surface 136 is integrally formed adjacent to the protrusion 134 in the outboard direction. Further, the sealing member inclined surface 136 has a third setting angle g. Further, the sealing member inclined surface 136 is formed in such a shape that the inner diameter gradually decreases along the outboard direction by the third setting angle g. The inward rail inclined surface 118 and the inclined surface 136 of the sealing member are spaced apart from each other by a predetermined distance. The set distance may be set by a person skilled in the art in order to prevent foreign matter from penetrating into the sealing apparatus 100 as much as possible and to facilitate the discharge of foreign matter from the inside of the sealing apparatus 100.

On the other hand, the sealing member sloped surface 136 may be parallel or substantially parallel to the antiskid slope 118. That is, the second setting angle f and the third setting angle g are the same or substantially the same. The second setting angle f and the third setting angle g are formed to be smaller than 20 degrees. The first, second, and third setting angles h, f, and g may be easily changed by those skilled in the art.

3 shows the distance a from the central axis X of the wheel bearing 10 to the outboard direction end of the sealing member slope 136, the minimum inner diameter b of the projection 134, The distance c from the central axis X of the inward slope 118 to the inboard end of the inward slope 118 is shown. Here, the inferior second extension portion 116 and the sealing member 130 are formed so that a relationship of a < b and b > c is established.

3 shows the distance d from the surface of the first inner extension portion 114 in the inboard direction to the outboard direction end of the second inner extension portion 116, The distance e from the face in the de direction to the sealing member 130 mounted on the outer frame extension 124 is shown. Here, the insole (110), the external iron (120), and the sealing member (130) are disposed so that the relationship d> e / 2 is established.

It will be apparent to those skilled in the art that the ring-shaped components of the sealing device 100 of the wheel bearing 10 will not be described in detail.

FIG. 4 is a view showing a state in which foreign substances are introduced and discharged in a sealing device for a wheel bearing according to an embodiment of the present invention. Also, in Fig. 4, the foreign matter is shown as a plurality of dots.

In FIG. 4 (a), foreign matter is permeated into the first space 140. In addition, FIG. 4 (b) shows that the foreign matter is discharged in the first space 140.

As described above, in the sealing apparatus 100 according to the embodiment of the present invention, the lip is not formed in the inflow portion of the foreign matter. Accordingly, the foreign matter introduced into the first space 140 is discharged to the outside by its own weight. 1, a state in which the sealing device 100 is positioned on the upper side of the wheel bearing 10 is shown, which is the same as the sealing device 100 in FIG. 4 (a). On the other hand, FIG. 4 (b) shows the state where the sealing device 100 is positioned on the lower side, and the inflow portion of the foreign matter is located on the lower side, and the foreign matter is discharged to the outside by its own weight.

As described above, according to the embodiment of the present invention, by reducing the contact portions of the outer and inner rings 120 and 110 with the ribs, it is possible to prevent the deterioration of the sealing performance due to wear of the contact portions of the ribs, ) Torque can be reduced. Further, as the drag torque is reduced, the fuel consumption can be improved.

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: Wheel bearing 20: Hub
22: flange 30: inner ring
40: outer ring 50: rolling body
60: grease 100: sealing device
110: inner ring 112: inner ring mount
114: first and second extended portions 116, 116: second extended portions
117: inner circumferential second extension part outer circumferential surface 118: inner steep slope
119: inner circumferential surface of second inner extension portion 120: outer circumferential surface
122: outer ring mounting part 124: outer iron extension part
130: sealing member 132: lip
134: projection 136: sealing member inclined surface
140: first space 142: second space

Claims (14)

An outer ring mounted on an inner peripheral surface of the outer ring in a wheel bearing, an inner ring mounted on an outer peripheral surface of the inner ring, and a sealing member disposed between the outer ring and the inner ring,
An outer ring mounting portion formed on the outer rail to be mounted on the outer ring;
An outer iron extension portion which is bent and extended in the outer ring mounting portion;
An inner ring mounting portion formed on the inner ring so as to be mounted on the inner ring and facing the outer ring mounting portion;
An inner iron first extending portion that is bent and extended from the inner wheel mounting portion and faces the outer iron extension portion;
An inner iron second extension portion bent from the inner iron first extension portion toward the outer iron extension portion and extending in the axial direction to form a first setting angle; And
An inner rail inclined surface formed on an outer circumferential surface of the second inwardly extending portion to form an axial direction and a second set angle;
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The sealing member provided between the outer ring mounting portion and the second inward second extending portion includes protrusions protruding toward the second inward second extending portion to prevent foreign matter from penetrating between the outer ring mounting portion and the inward second extending portion, And a sealing member inclined surface corresponding to the inwardly sloping surface to form an axial direction and a third setting angle,
Wherein no lip is formed on the sealing member provided between the outer ring mounting portion and the second inward-facing second extending portion. delete The method according to claim 1,
Wherein the inwardly sloping surface is inclined so that its outer diameter gradually decreases along the outboard direction. The method according to claim 1,
And the second setting angle of the second inward-facing second extension portion is smaller than 20 degrees. The method according to claim 1,
Wherein the second inward-facing second extension portion is formed so as to be inclined such that its radius gradually increases along the outboard direction. The method according to claim 1,
And a lip formed on the sealing member is not brought into contact with the second inward-facing second extension portion. delete The method according to claim 1,
And the protrusion is formed at an end portion of the sealing member provided in the inboard direction between the outer ring mounting portion and the inner ring second extending portion. The method according to claim 1,
And the inclined surface of the sealing member is inclined so that its inner diameter gradually decreases along the outboard direction. The method according to claim 1,
And the third setting angle of the sealing member inclined surface is smaller than 20 degrees. The method according to claim 1,
Wherein a distance from a central axis of the wheel bearing to an end of the sealing member in the outboard direction is smaller than a minimum inner diameter of the protrusion. The method according to claim 1,
Wherein a minimum inner diameter of the protrusion is larger than a distance from a central axis of the wheel bearing to an inboard end of the inverse rail inclined surface. The method according to claim 1,
Wherein the inwardly sloping surface and the inclined surface of the sealing member are spaced apart from each other by a predetermined distance. The method according to claim 1,
The distance from the inboard direction of the first inwardly extending portion to the outboard direction end of the second inwardly extending portion extends from the inboard direction of the inwardly extending first inward portion to the sealing member mounted on the outwardly extending portion, Of the wheel bearing.

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