KR20230076539A - Seal device of wheel bearings equipped with functions to prevent inflow of foreign substances and induce discharge - Google Patents

Abstract

The present invention relates to a seal device of wheel bearings equipped with functions to prevent the entry of foreign substances and facilitate their discharge. More specifically, the seal device comprises: a rotating disk coupled to the outside of an inner ring of a bearing; a fixed disk coupled to the inside of an outer ring of the bearing and spaced apart in an axial direction of the rotating disk; a sealing member coupled to the rotating disk and provided with a lip portion to ensure airtightness in a space between the rotating disk and the fixed disk; a ring member mounted on the lip portion of the sealing member to press and support the lip portion in the direction of the rotating disk; a protruding member connected to the rotating disk to prevent foreign substances from entering the space and to facilitate the discharge of the introduced foreign substances. Therefore, the present invention proposes a wheel bearing seal device equipped with functions to prevent the entry of foreign substances and facilitate their discharge, wherein the ring member having elastic force is mounted on the lip portion of the ring member such that airtightness can be maintained even when the lip portion is worn. The protruding member provided on the rotating disk prevents foreign substances from entering a seal chamber, and at the same time, is structurally designed to act as a pump when the wheel rotates, thereby improving sealing performance by guiding the discharge of the foreign substances, which have entered the seal chamber, to the outside.

Description

Sealing device of wheel bearings equipped with functions to prevent inflow of foreign substances and induce discharge}

In the present invention, a ring member having elasticity is mounted on the lip of the sealing member so that airtight performance can be maintained even when the lip is worn, and a protruding member provided on the rotating disk prevents foreign substances from entering the seal chamber and at the same time , It is structurally configured to play a pumping role when the wheel rotates, and induces the discharge of foreign substances that have flowed into the seal chamber to the outside, thereby improving the sealing performance. The sealing device for wheel bearings equipped with functions to prevent inflow of foreign substances and induce discharge it's about

In general, a wheel bearing for a vehicle is a device for rotatably installing a wheel on a vehicle body. In the wheel bearing, a rotating element to which the wheel is mounted is connected to a non-rotating element fixed to the vehicle body through a rolling element, and the wheel bearing is mounted on the rotating element. It is configured to be rotatably mounted on the vehicle body and supported.

Conventional wheel bearings are composed of an outer ring fixed to a vehicle body, an inner ring rotatably installed on the wheel inside the outer ring, and a rolling element (such as a ball) interposed between the outer ring and the inner ring.

Since these wheel bearings are exposed to foreign substances such as external dust or moisture due to the nature of being mounted on the wheel of a vehicle, when foreign substances flow into the inside of the wheel bearing, the rotating surfaces of the wheel hub and outer ring are damaged and the life is shortened. There was a concern that noise and vibration may occur due to foreign substances during operation.

In order to solve this problem, a sealing structure is installed on one side or both sides of the wheel bearing to prevent entry of foreign substances from the outside and leakage of lubricant (eg, grease).

However, since the conventional wheel bearing has a structure in which foreign substances cannot easily escape to the outside when foreign substances are introduced into the inside, a structure capable of easily discharging foreign substances introduced into the inside while maintaining sealing performance is required. do.

In particular, in the case of medium and large-sized trucks, the demand for high performance is increasing, and since they are mainly operated in poor environments such as construction sites or off-road, development of a sealing structure with improved sealing performance, prevention of contamination of foreign substances, and furthermore, the function of discharging foreign substances This is desperately needed.

Republic of Korea Patent Publication No. 10-2018-0020823 (2018.02.28. Publication)

The present invention has been made to solve the above problems,

One object is to maintain airtight performance even when the lip portion is worn by mounting a ring member having elasticity on the lip portion of the sealing member.

In the present invention, the protruding member provided on the rotating disk prevents the inflow of foreign substances into the seal chamber and at the same time structurally functions as a pump when the wheel rotates, thereby inducing the discharge of foreign substances introduced into the seal chamber to the outside. Another objective is to improve performance.

A sealing device for a wheel bearing having a function of preventing inflow of foreign substances and inducing discharge thereof according to the present invention includes a rotating disk coupled to an outer side of an inner ring of a bearing; A fixed disk coupled to the inner side of the outer ring of the bearing and spaced apart from each other in the axial direction of the rotating disk; a sealing member coupled to the rotating disk and provided with a lip portion to ensure airtightness in a separation space between the rotating disk and the fixed disk; a ring member mounted on the lip of the sealing member to press and support the lip in the direction of the rotating disk; and a protruding member connected to the rotating disk to prevent the inflow of foreign substances into the separation space and to induce discharge of the introduced foreign substances.

The protruding member according to the present invention is characterized in that it consists of a first protrusion formed in a spiral shape along the circumferential surface of the edge portion of the rotating disk.

The protruding member according to the present invention is characterized in that it consists of a second protrusion formed along the circumferential surface of the edge portion of the rotating disk and arranged so as to be eccentric about the rotation axis.

The cross-sectional shape of the first protrusion or the second protrusion or the first and second protrusions according to the present invention is characterized in that it consists of a polygonal or semicircular shape.

The ring member according to the present invention is characterized in that it is an elastic body capable of maintaining airtightness by exerting an elastic force when the lip portion is worn.

According to the present invention, the sealing device for a wheel bearing having a function of preventing inflow of foreign substances and inducing discharge thereof can maintain airtightness even when the lip portion is worn by mounting a ring member having an elastic force to the lip portion of the sealing member.

In addition, in the present invention, the protruding member provided on the rotating disk is configured to prevent the inflow of foreign substances into the seal chamber and at the same time to structurally play a pumping role when the wheel rotates, thereby inducing the discharge of foreign substances introduced into the seal chamber to the outside. Sealing performance can be improved.

1 is a cross-sectional view showing a sealing device for a wheel bearing equipped with a foreign matter inflow prevention and discharge induction function according to the present invention;
2 is a cross-sectional view showing a first embodiment of a sealing device for a wheel bearing according to the present invention;
3 is a cross-sectional view showing a second embodiment of a sealing device for a wheel bearing according to the present invention;
Figure 4 is a front view showing only the protruding member portion in each embodiment of Figures 2 and 3;

In order to explain the present invention and the operational advantages of the present invention and the objectives achieved by the practice of the present invention, the following describes a preferred embodiment of the present invention and references it.

First, the terms used in this application are used only to describe specific embodiments, and are not intended to limit the present invention, and singular expressions may include plural expressions unless the context clearly indicates otherwise. In addition, in this application, terms such as "comprise" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other It should be understood that the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof is not precluded.

In describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

In the present specification, foreign matter is a concept including materials that may be introduced from the outside, such as moisture, dust, soil, and the like, and unless otherwise specified, foreign matter includes the above-listed inflow materials.

As shown in FIGS. 1 to 4, the sealing device for wheel bearings equipped with a function of preventing inflow of foreign substances and promoting discharge according to the present invention includes a rotating disk 10, a fixed disk 20, a sealing member 30, and a ring member ( 40) and a protruding member 50.

First, the wheel bearing rotatably connects a wheel to which a vehicle body and a wheel are connected, and may be provided with an inner ring, an outer ring, and rolling elements (balls, etc.). In this case, the inner ring of the wheel bearing is coupled to the outside of the wheel mechanically connected to the wheel of the vehicle, is coupled in a state of surrounding the outside of the wheel, and may have an annular shape with a hollow inside.

In addition, the outer ring of the wheel bearing is fixed to the vehicle body, is installed in a state of surrounding the outside of the inner ring with a rolling element interposed therebetween, and may have an annular shape with a hollow formed to surround the outside of the inner ring.

In the sealing device installed in the wheel bearing, the rotating disk 10 is coupled to the inner ring 1 of the wheel bearing, the fixed disk 20 is mounted on the outer ring 3 of the wheel bearing, and the rotating disk 10 and the fixed disk The sealing member 30 is provided on the spaced space between (20) (hereinafter referred to as 'seal chamber (S)'), that is, the space spaced apart in the axial direction, and is configured to prevent the inflow of foreign substances.

Hereinafter, a sealing device mounted on a wheel bearing will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 4 , the rotating disk 10 according to the present invention is coupled to the inner ring 1 of the wheel bearing to be rotatable.

To this end, the rotating disk 10 is composed of an annular first flange portion 11, a first extension portion 13, and a bent portion 15.

First, the first flange portion 11 has a hollow annular shape to surround the outside of the inner ring 1 of the wheel bearing, and is manufactured to have a certain length in the axial direction.

In addition, the first extension portion 13 extends in the outer radial direction of the first flange portion 11 and is continuously formed along the circumferential direction of the first flange portion 11, and is formed continuously in the axial direction of the first flange portion 11. and may extend in a direction perpendicular to it.

In addition, the bent portion 15 is bent and extended from the first extension portion 13 in the axial direction of the fixing disk 20 to be described later, and is disposed crosswise inside the second flange portion 21 . In addition, the bent portion 15 is made of a hollow annular shape and has a constant length in the axial direction.

As shown in FIGS. 1 to 4, the fixed disk 20 according to the present invention is spaced apart in the axial direction of the rotating disk 10 and is formed in a hollow annular shape, so that the outer circumferential surface is the inner circumferential surface of the outer ring 3 of the wheel bearing. It is configured to be fixed and coupled to.

To this end, the fixed disk 20 is composed of an annular second flange portion 21 and a second extension portion 23.

First, the second flange portion 21 is coupled to the inner circumferential surface of the outer ring 3 of the wheel bearing, and the bent portion 15 of the rotating disk 10 is disposed on the inner circumferential surface, so that the second flange portion 21 forms the bent portion 15 It is arranged spaced apart in the form of wrapping the outer circumferential surface of. In this case, the second flange portion 21 is composed of a hollow annular shape (cylinder, etc.) so as to surround the outside of the inner ring 1 of the wheel bearing, and is manufactured to have a certain length in the axial direction.

In addition, the second extension part 23 extends in the inner radial direction of the second flange part 21 and is spaced apart from the second extension part 23 in the axial direction. In addition, the second extension part 23 may be formed along the inner circumferential surface of the second flange part 21, may extend in a direction perpendicular to the axial direction of the second flange part 21, and the second flange part 21 ) can be formed continuously along the circumferential direction of The extended end of the second extension part 23 configured as described above is disposed in a spaced apart state on the outer circumference of the first flange portion 11, and the extended end may also be disposed so as to protrude outward.

As shown in FIGS. 1 to 4, the sealing member 30 according to the present invention is coupled to the rotating disk 10 and is provided with a lip portion 32 to maintain airtightness in the seal chamber S. It is configured.

The sealing member 30 for this purpose is preferably manufactured using a material such as rubber, which is an elastic material, and may include a hollow annular body part 31 and a plurality of lip parts 32.

The body portion 31 is formed extending from the outer peripheral edge of the second flange portion 21 to a certain portion of the inner circumference while surrounding the end of the second extension portion 23 along the outer circumferential surface of the second extension portion 23. can

A plurality of lip parts 32 are connected to the body part 31 configured as described above. First, the main lip 33 is disposed at the lower end of the body part 31 . The main lip 33 is disposed inside the seal chamber S, and extends in an oblique direction so that its end comes into contact with the outer circumferential surface of the first flange portion 11.

In addition, a first lip 34 is disposed at the lower end of the body portion 31, and the first lip 34 is configured to come into contact with the outer circumferential surface of the end side of the second flange portion 21. In addition, a second lip 35 is disposed on a portion extending from the body portion 31 to the inner circumferential surface of the second extension portion 23, that is, on the upper part of the main lip 33, and the second lip 35 is It is configured to come into contact with the inner circumferential surface of the extension part 13 .

In addition, the lip portion 32 is filled with grease at each end for lubricating action.

The lip portion 32 of the sealing member configured as described above extends in an annular shape from the axial direction of the body portion 31 and is elastically in close contact with the outer surface of the first flange portion 11 and the inner surface of the first extension portion 13 to remove foreign substances. It exhibits sealing performance to prevent the inflow into the wheel bearing.

However, unlike the existing sealing structure, in the present invention, the ring member 40 is introduced so that the airtight performance can be maintained when the lip portion 32, especially the main lip 33, is worn, and also removes foreign substances onto the seal chamber S. A protruding member 50 is introduced so as to not only block the inflow but also to facilitate the discharge of the inflowing foreign substances.

Hereinafter, the ring member 40 and the protruding member 50 as described above will be described in more detail with reference to the accompanying drawings.

First, as shown in FIGS. 1 to 4, the ring member 40 according to the present invention is mounted on the lip portion 32 of the sealing member 30 and is configured to press the lip portion 32 in the direction of the rotating disk 10 .

That is, the ring member 40 is composed of an annular elastic body, that is, a material having elasticity such as a spring, and may be mounted on the lip portion 32, particularly the main lip 33. In this case, an annular seating groove 36 is formed on the outer circumferential surface of the main lip 33, and the ring member 40 is placed in the seating groove 36.

The ring member 40 configured as described above prevents the airtightness from being reduced due to wear of the main lip 33, which is because the ring member 40 has elasticity, so when the main lip 33 is worn, the elastic force By exerting pressure on the main lip 33 toward the first flange portion 11, airtightness can be maintained. In this case, the ring member 40 can maintain airtightness more effectively through pressing force in a state where the main lip 33 is not worn.

Next, as shown in FIGS. 1 to 4, the protruding member 50 according to the present invention is connected to the end of the rotating disk 10 to prevent foreign substances from entering the seal chamber S, and the foreign substances introduced into the seal It is configured to induce discharge from the chamber (S).

The protruding member 50 according to the present invention can be implemented through various embodiments. In the case of the first embodiment shown in FIG. It may be composed of a first protrusion 51 formed in a spiral shape along the circumferential surface of (15).

As shown in FIG. 2 , the first protrusion 51 is connected to an adhesive portion 51a attached to the upper outer surface of the first extension portion 13 and adhered to the bent portion 15 . In particular, the first protrusion 51 is formed in a spiral shape along the circumferential surface of the bent portion 15, and when the cross section of the first protrusion 51 is a triangular shape as shown in FIG. It can be arranged in a form that moves in a direction.

In more detail, when the state of FIG. 2 (a) is 0° on the circumferential surface, the first protrusion 51 has the shape of a right triangle with a left side being vertical, and the apex is disposed on the left side. In this state, when the point is 90° as shown in FIG. 2 (c), the apex of the first protrusion 51 is disposed approximately in the center. As shown in FIG. 2 (e), when the point is 180° on the circumferential surface, the vertex of the first protrusion 51 is disposed at the opposite point to that at 0° in FIG. 2 (a). After the 180° point, the phase of the vertex proceeds in reverse, and at the 360° point, the vertex meets at the same point as when the state in FIG. 2 (a) is 0°. That is, the first protrusion 51 forms a spiral shape on the circumferential surface. In this case, the first protrusions 51 form concentric circles on a plane as shown in FIG. 4 (a).

Therefore, the rotating disk 10 rotates in conjunction with the rotation of the wheel, and at this time, the first protrusion plays a role of pumping the air inside the seal chamber outward to remove foreign substances introduced into the seal chamber (S). It is induced to be discharged to the outside.

Furthermore, the second embodiment of the protruding member 50 is formed along the edge portion of the rotating disk 10, that is, along the circumferential surface of the bent portion 15 of the rotating disk 10, as shown in FIG. 4 (b). As shown in ), it may be composed of a second protrusion 53 arranged to be eccentric about the rotation axis.

The second protrusion 53 is formed so that the protrusion height increases toward one side around the rotation axis and is configured to be eccentric, so that when the rotating disk 10 rotates in conjunction with the rotation of the wheel as in the first embodiment, the second protrusion ( 53) acts as a pump, and foreign substances introduced into the seal chamber (S) can be discharged to the outside.

The protruding member 50 according to the present invention configured as described above plays a pumping role with the rotation of the wheel, thereby blocking the inflow of foreign substances into the seal chamber (S), as well as inducing the discharge of foreign substances introduced into the seal chamber (S) You will be able to do it.

2 and 3, the cross-sectional shape of the protruding member 50 according to the present invention is shown as being manufactured in a triangular shape, but it can be manufactured in various shapes such as a rectangular shape or a round semicircle.

As such, the present invention has been described with reference to one embodiment shown in the drawings, but this is only exemplary, and those skilled in the art can make various modifications and equivalent other embodiments therefrom. will understand

Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

S : Seal chamber G : Grease
1: inner ring 3: outer ring
10: Rotating disk
11: first flange portion 13: first extension portion
15: bending part
20: fixed disk
21: second flange portion 23: second extension portion
30: sealing member
31: body part 32: lip part
33: main lip 34: first lip
35: second lip 36: seating groove
40: ring member
50: protruding member
51: first protrusion 51a: adhesive portion
53: second protrusion

Claims (5)

A rotating disk 10 coupled to the outer side of the inner ring 1 of the bearing;
A fixed disk 20 coupled to the inner side of the outer ring 3 of the bearing and spaced apart from each other in the axial direction of the rotating disk 10;
a sealing member 30 coupled to the rotating disk 10 and provided with a lip portion 32 to ensure airtightness in the separation space between the rotating disk 10 and the fixed disk 20;
a ring member 40 mounted on the lip portion 32 of the sealing member 30 to press and support the lip portion 32 toward the rotating disk 10; and
a protruding member 50 connected to the rotating disk 10 to prevent foreign substances from entering the separation space and to induce discharge of the introduced foreign substances;
Sealing device for wheel bearings equipped with a function to prevent inflow of foreign substances and induce discharge, including a.
According to claim 1,
The protruding member 50 is composed of a first protrusion 51 formed in a spiral shape along the circumferential surface of the edge portion of the rotating disk 10. Device.
According to claim 1,
The protruding member 50 is formed along the circumferential surface of the edge portion of the rotating disk 10 and consists of a second protruding portion 53 arranged to be eccentric about the rotational axis, characterized in that the foreign material inflow prevention and discharge induction function The sealing device of the wheel bearing provided with this.
According to claim 2 or 3,
The cross-sectional shape of the first protrusion 51 or the second protrusion 53 or the first and second protrusions 51, 53 is a polygonal or semicircular shape, characterized in that the inflow prevention and discharge induction function The sealing device of the wheel bearing provided with this.
According to claim 1,
The ring member 40 is a sealing device for a wheel bearing having a foreign material inflow prevention and discharge induction function, characterized in that it is an elastic body capable of maintaining airtightness by exerting an elastic force when the lip portion 32 is worn.

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