KR102592714B1 - Wheel bearing for vehicle having improved sealing function - Google Patents

Abstract

According to one embodiment of the present invention, a wheel bearing for a vehicle is provided that supports a vehicle wheel by rotatably mounting it on a vehicle body. A wheel bearing for a vehicle according to an embodiment of the present invention includes a wheel hub on which the wheel of the vehicle is mounted, an outer ring disposed on the radial outer side of the wheel hub and mounted on the body of the vehicle, and a rolling element disposed between the wheel hub and the outer ring. and a sealing member that seals between the wheel hub and the outer ring, and the sealing member may be configured to include a slinger mounted and fixed to the wheel hub and an elastic sealing portion attached to the slinger. According to one embodiment of the present invention, the slinger includes a press-fitting portion press-fitted and mounted on the outer peripheral surface of the wheel hub, a radial extension portion formed by extending radially outward from the press-fit portion, and a radial extension portion formed from a radially outer end of the radial extension portion. It includes an axial extension portion extending in the axial direction and an auxiliary extension portion extending radially outward from the inner end of the press-fit portion, and an annular space is formed around the rotation axis of the wheel bearing by the radial extension portion, the press-fit portion, and the auxiliary extension portion. It may be configured to form a section.

Description

Wheel bearing for vehicle having improved sealing function {Wheel bearing for vehicle having improved sealing function}

The present invention relates to a wheel bearing for a vehicle that supports the wheel of a vehicle by rotatably mounted on the vehicle body. More specifically, the structure of the sealing member is improved to more reliably prevent the inflow of external foreign substances or the leakage of internal lubricant. It relates to wheel bearings for vehicles.

A wheel bearing is a device used to support a vehicle's wheels by rotatably mounting them on the vehicle body. The rotating element (wheel hub) on which the wheel is mounted is connected to the non-rotating element (outer wheel) fixed to the vehicle body through a rolling element. It is configured to support the wheel connected to the rotating element (wheel hub) by mounting it on the vehicle body in a rotatable state.

These wheel bearings are easily exposed to external contaminants such as dust or moisture due to the nature of the product used by being mounted on the wheels of a vehicle. Therefore, foreign substances may flow into the wheel bearings, causing noise during vehicle operation or damage to the rolling elements or electric components. To prevent damage to the fuselage raceway, etc., a sealing member is installed on one or both sides.

Referring to Figure 1, the structure of a wheel bearing for a vehicle including a sealing member is shown by way of example. As shown in FIG. 1, the vehicle wheel bearing 10 includes a wheel hub 20 on which a wheel is mounted, an inner ring 30 press-fitted to one side of the wheel hub 20, and a wheel hub 20. It consists of an outer ring (40) mounted on the radial outer side of the inner ring (30) and fixed to the vehicle body, a wheel hub (20), and a rolling element (50) placed between the inner ring (30) and the outer ring (40). A sealing member 60 is installed in the space formed between the wheel hub 20 and the inner ring 30 and the outer ring 40 to prevent the inflow of external foreign substances or leakage of internal lubricant.

Meanwhile, referring to FIG. 2, the structure of a sealing member (slinger type sealing member) that can be used in the vehicle wheel bearing 10 is shown as an example. As shown in the drawing, the conventional sealing member 60 used in the vehicle wheel bearing 10 consists of a slinger 62 that is press-fitted and mounted on the wheel hub 20 and an elastic sealing lip attached to the slinger 62. It may be composed of (64), and the elastic sealing lip (64) is configured to slide in close contact with the outer peripheral surface of the outer ring (30) to prevent external foreign substances from entering the wheel bearing.

However, in the case of the conventional slinger type sealing member 60, it is difficult to ensure sufficient sealing performance because most of the sealing depends on the elastic sealing lip 64 provided on a portion of the outer end of the slinger 62. There is a problem in that it is difficult to effectively prevent leakage of internal lubricant because there is no structure in the center to prevent leakage of lubricant.

Korean Patent No. 10-1383275 (Registration date: 2014.04.02.)

The present invention is intended to solve the above-mentioned problems of vehicle wheel bearings, and provides a vehicle wheel bearing configured to more reliably prevent the inflow of external foreign substances or leakage of internal lubricant (grease) by improving the structure of the sealing member. The purpose.

A representative configuration of the present invention to achieve the above-described object is as follows.

According to one embodiment of the present invention, a wheel bearing for a vehicle is provided that supports a vehicle wheel by rotatably mounting it on a vehicle body. A wheel bearing for a vehicle according to an embodiment of the present invention includes a wheel hub on which the wheel of the vehicle is mounted, an outer ring disposed on the radial outer side of the wheel hub and mounted on the body of the vehicle, and a rolling element disposed between the wheel hub and the outer ring. and a sealing member that seals between the wheel hub and the outer ring, and the sealing member may be configured to include a slinger mounted and fixed to the wheel hub and an elastic sealing portion attached to the slinger. According to one embodiment of the present invention, the slinger includes a press-fitting portion press-fitted and mounted on the outer peripheral surface of the wheel hub, a radial extension portion formed by extending radially outward from the press-fit portion, and a radial extension portion formed from a radially outer end of the radial extension portion. It includes an axial extension portion extending in the axial direction and an auxiliary extension portion extending radially outward from the inner end of the press-fit portion, and an annular space is formed around the rotation axis of the wheel bearing by the radial extension portion, the press-fit portion, and the auxiliary extension portion. It may be configured to form a section.

According to one embodiment of the present invention, the axial extension portion of the slinger may be configured to partially surround the outer peripheral surface of the outer ring.

According to one embodiment of the present invention, the elastic sealing part may be provided in the axial extension part of the slinger.

According to one embodiment of the present invention, the elastic sealing part may include one or more elastic sealing lips that contact one side of the outer ring to perform sealing.

According to one embodiment of the present invention, the auxiliary extension part may be configured to extend to a height of more than half of the radial gap formed between the outer peripheral surface of the wheel hub on which the press-fitting part of the slinger is mounted and the inner peripheral surface of the outer ring opposing it.

According to one embodiment of the present invention, an auxiliary sealing part may be further provided at the end of the auxiliary extension.

According to one embodiment of the present invention, the auxiliary sealing part may be formed in the form of a sealing lip extending in one direction so that the end of the sealing lip contacts one side of the outer ring to perform sealing.

According to one embodiment of the present invention, the elastic sealing lip of the elastic sealing part and the auxiliary sealing part may be configured to extend in an inclined direction with respect to the rotation axis of the wheel bearing.

According to one embodiment of the present invention, the elastic sealing lip of the elastic sealing portion may be configured to be inclined so as to move toward the opposite direction of the radial extension portion of the slinger toward the end.

In addition to this, the wheel bearing for a vehicle according to the present invention may further include other additional components without impairing the technical spirit of the present invention.

The wheel bearing for a vehicle according to an embodiment of the present invention has an auxiliary extension extending radially outward at the inner end of the slinger forming the sealing member, and this auxiliary extension provides a space between the outer peripheral surface of the wheel hub and the inner peripheral surface of the outer ring. As the gap formed in is narrowed, a better labyrinth structure can be formed between the wheel hub and the outer ring, which improves the sealing performance of the wheel bearing.

Furthermore, in the wheel bearing for a vehicle according to an embodiment of the present invention, an annular space is formed around the rotation axis due to the auxiliary extension formed at the inner end of the slinger, so even if foreign substances such as moisture enter the inside, the introduced foreign substances do not enter the space. It can be prevented from moving further to the inside of the wheel bearing (for example, the rolling element and the rolling element raceway), thereby further improving the performance and lifespan of the wheel bearing.

In addition, the wheel bearing for a vehicle according to an embodiment of the present invention is configured to form an auxiliary sealing lip on the auxiliary extension formed at the inner end of the slinger so that this auxiliary sealing lip contacts one side of the outer ring, so that this auxiliary sealing lip This makes it possible to more effectively prevent leakage of internal lubricant.

Figure 1 exemplarily shows a conventional wheel bearing structure for a vehicle.
FIG. 2 exemplarily shows the structure of a sealing member (part A shown in FIG. 1) that can be used in a conventional vehicle wheel bearing.
Figure 3 exemplarily shows the structure of a wheel bearing for a vehicle according to an embodiment of the present invention.
FIG. 4 exemplarily shows the structure of a sealing member (part B shown in FIG. 4) that can be applied to a wheel bearing for a vehicle according to an embodiment of the present invention.
FIG. 5 exemplarily shows how foreign matter such as moisture flowing into the sealing member shown in FIG. 4 is accommodated and retained in a space formed in the slinger of the sealing member.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail so that a person skilled in the art can easily implement the present invention.

In order to clearly explain the present invention, detailed descriptions of parts unrelated to the present invention will be omitted, and like elements will be described with the same reference numerals throughout the specification. In addition, the shape and size of each component shown in the drawings are arbitrarily drawn for convenience of explanation, and the present invention is not necessarily limited to the shape and size shown. That is, the specific shape, structure, and characteristics described in the specification may be modified and implemented from one embodiment to another without departing from the spirit and scope of the present invention, and the location or arrangement of individual components may also be implemented within the spirit and scope of the present invention. It should be understood that changes can be made without departing from the scope. Accordingly, the detailed description described below is not intended to be limited, and the scope of the present invention should be taken to encompass the scope claimed by the claims and all equivalents thereof.

Preferred Embodiments of the Invention

3 to 5, a wheel bearing 100 for a vehicle according to an embodiment of the present invention is shown as an example. As shown in the drawing, the wheel bearing 100 for a vehicle according to an embodiment of the present invention is composed of a wheel hub 110, an inner ring 120, an outer ring 130, and a rolling element 140, and is similar to a typical wheel. It can be formed into an overall structure similar to that of a bearing.

According to one embodiment of the present invention, the wheel hub 110 may be formed into a substantially cylindrical structure extending along the axial direction, and a hub flange may be provided near the wheel side end of the wheel hub 110. . The hub flange is formed in a shape that extends radially outward along the circumferential direction of the wheel hub 110, and can be used to mount the wheel to the wheel hub 110 using hub bolts, etc. Meanwhile, a step may be formed at the end of the vehicle body side of the wheel hub 110 to mount the inner ring 120, and a raceway surface (inner raceway surface) may be formed on a portion of the outer circumferential surface of the wheel hub 110, so that the rolling element ( 140) can be configured to support it from the inside. However, in the case of the embodiment shown in the drawing, one raceway surface for supporting the rolling element is formed directly on a portion of the outer peripheral surface of the wheel hub. However, unlike this, two inner rings are mounted on the wheel hub, and the rolling element is formed through the two inner rings. It may be configured to form a track surface (inner track surface) of the fuselage.

The inner ring 120 may be configured to be press-fitted and mounted on one side of the wheel hub 110. For example, the inner ring 120 is press-fitted and mounted on a step formed at the end of the vehicle body side of the wheel hub 110, and the end of the wheel hub 110 is plastically deformed as shown in FIG. 3 or the wheel hub 110 ) can be configured to be seated and maintained on the wheel hub 110 by fastening a nut, etc. to the end of the car body. In addition, the outer peripheral surface of the inner ring 120 may be provided with a raceway surface (inner raceway surface) that the rolling element 140 contacts, so as to support the rolling element from the inside.

The outer ring 130 may be configured to have a mounting flange on its outer circumferential surface for mounting the wheel bearing 100 to the vehicle body, and a raceway surface (outer raceway surface) with which the rolling element 140 contacts its inner circumferential surface. The raceway (outer raceway) formed on the inner peripheral surface of the outer ring 130 cooperates with the raceway (inner raceway) formed on the wheel hub 110 and/or the inner ring 120, and the rolling element (rolling element) between the raceway surfaces 140) can be configured to accommodate and support.

The rolling element 140 is disposed between the raceway surface (inner raceway surface) formed on the wheel hub 110 and/or the inner ring 120 and the raceway surface (outer raceway surface) formed on the outer ring 130, on which the wheel is mounted. The wheel hub 110 can be rotatably supported with respect to the outer ring 130 fixed to the vehicle body. In the embodiment shown in the drawing, the rolling element 140 is formed using a tapered roller, but the rolling element 140 may be formed of a rolling member of another shape, such as a ball.

Meanwhile, according to an embodiment of the present invention, a sealing member 200 may be provided on one or both sides of the wheel bearing to prevent external foreign substances from entering the wheel bearing or internal lubricating oil from leaking to the outside. .

Referring to FIG. 4, a sealing member (eg, a wheel side sealing member) that can be applied to the wheel bearing 100 according to an embodiment of the present invention is shown as an example. As shown in the drawing, the sealing member 200 according to an embodiment of the present invention may be mounted between the wheel hub 110 and the outer ring 130 and configured to perform a sealing function.

According to one embodiment of the present invention, the sealing member 200 includes a slinger 210 mounted on the wheel hub 110, an elastic sealing portion 220 mounted on the slinger 210, and an auxiliary It may include a sealing part 230.

According to one embodiment of the present invention, the slinger 210 may be configured to be press-fitted and mounted on one side of the wheel hub 110. Specifically, the slinger 210 includes a press-fitting portion 212 that is press-fitted and mounted on the outer peripheral surface of the wheel hub 110, a radial extension portion 214 extending radially outward from the press-fitting portion 212, and a radial extension portion 214 that is press-fitted and mounted on the outer peripheral surface of the wheel hub 110. It may be configured to include an axial extension portion 216 extending axially from the extension portion 214, and an auxiliary extension portion 218 extending radially outward is further provided at one end of the press-fitting portion 212. It can be configured as follows.

The press-fit portion 212 of the slinger 210 is configured to extend approximately along the axial direction of the wheel bearing and has an inner diameter that corresponds to the outer diameter of the slinger mounting surface formed on the wheel hub 110. It may be configured to be press-fitted and mounted.

The radial extension portion 214 of the slinger 210 is configured to extend radially outward from the wheel side end of the press-fit portion 212, and may be configured to be mounted in contact with one side of the wheel hub or spaced apart from it. . In the embodiment shown in the drawing, the radial extension portion 214 is configured to extend radially outward perpendicular to the axial direction, but the radial extension portion 214 extends not only in a direction perpendicular to the axial direction but also at a predetermined angle. It may be configured to extend obliquely outward in the radial direction.

The axial extension portion 216 of the slinger 210 extends axially from the radially outer end of the radial extension portion 214 and is configured to partially surround the radial outer side of the outer ring 130, thereby forming the wheel hub 110. It may be configured to prevent external foreign substances from entering between the outer ring 130 and the outer ring 130. In the case of the embodiment shown in the drawing, the axial extension portion 216 is configured to extend parallel to the axial direction, but the axial extension portion 216 is inclined not only in a direction parallel to the axial direction but also obliquely at a predetermined angle. It may be configured to extend in the axial direction as in the photo.

The auxiliary extension portion 218 of the slinger 210 extends radially outward from the inner end of the press-fit portion 212 to form the outer peripheral surface of the wheel hub 110 on which the press-fit portion 212 is mounted and the outer ring 130 opposing it. It can be configured to reduce the radial gap formed between the inner peripheral surfaces of.

In this way, unlike the conventional wheel bearing, the wheel bearing 100 according to an embodiment of the present invention connects the wheel hub 110 and the outer ring 130 by the auxiliary extension portion 218 formed at the inner end of the slinger 210. Since the gap between them is designed to be reduced, it is possible to more effectively prevent the inflow of external foreign substances or the leakage of internal lubricant.

Moreover, the wheel bearing 100 according to an embodiment of the present invention forms an auxiliary extension portion 218 at the inner end of the slinger 210, so that the radial extension portion 214 and the press-fit portion ( 212), an annular space (S) is formed around the rotation axis by the auxiliary extension part 218, so that even if external foreign substances such as moisture enter the inside, they do not move further inside the wheel bearing and remain in the space (S) It is retained (see FIG. 5), making it possible to effectively prevent the performance and lifespan of the wheel bearing from being damaged due to damage to the rolling element and/or rolling element raceway due to the inflow of foreign matter.

According to one embodiment of the present invention, an elastic sealing part 220 may be attached to all or part of the slinger 210 forming the sealing member 200 to perform a sealing function. For example, the wheel bearing 100 according to an embodiment of the present invention has elastic material such as rubber at the outer end of the slinger 210 (in the case of the embodiment shown in the drawing, the end of the axial extension portion 216). It may be configured to be provided with an elastic sealing portion 220 made of material.

According to one embodiment of the present invention, the elastic sealing portion 220 may include one or more elastic sealing lips 222 extending radially inward. The end of this elastic sealing lip 222 may be configured to contact one side of the outer ring 130 to seal between the outer ring 130 and the slinger 210.

According to one embodiment of the present invention, the elastic sealing lip 222 may be configured to extend in an inclined direction with respect to the rotation axis of the wheel bearing. For example, the elastic sealing lip 222 moves in the opposite direction to the radial extension 214 of the slinger 210 toward the end (that is, the outer ring 130 and the axial extension of the slinger 210 toward the end ( 216) may be configured to be inclined so as to move toward the inlet side of the opening formed therebetween. According to this configuration, the elastic sealing lip 222 of the elastic sealing part 220 extends in the direction in which external foreign substances enter and is configured to contact one side of the outer ring 130, thereby more effectively preventing the inflow of external foreign substances. It may be possible to do so.

According to one embodiment of the present invention, the elastic sealing part 220 may further include an end sealing part 224 surrounding the outer end of the slinger 210. This end sealing portion 224 can perform the function of further improving the sealing performance of the sealing member 200 by narrowing the space between the outer end of the slinger 210 and the outer ring 130.

According to an embodiment of the present invention, an auxiliary sealing part 230 is provided at the inner end of the slinger 210 (in the case of the embodiment shown in the figure, an auxiliary extension part 218 provided at the inner end of the slinger 210). More may be provided. For example, the auxiliary sealing part 230 may be formed in the form of a sealing lip extending to one side from the slinger 210 so that the end of the sealing lip contacts one side of the outer ring 130 to perform sealing.

In this way, when the auxiliary sealing portion 230 is provided at the inner end of the slinger 210, the radial inner portion of the outer ring 130 can be sealed more stably, and the conventional sealing portion shown in FIGS. 1 and 2 can be sealed more stably. Unlike wheel bearings, leakage of internal lubricant can be effectively prevented.

Although the present invention has been described above with reference to specific details such as specific components and limited examples, these examples are provided only to facilitate a more general understanding of the present invention, and the present invention is not limited thereto. Anyone with ordinary knowledge in the relevant technical field can make various modifications and variations from this description. For example, in the previously described embodiment, a wheel bearing equipped with a sealing member according to the present invention was described using a wheel bearing of the third generation structure in which one inner ring is press-fitted and mounted on the wheel hub. However, the wheel bearing according to the present invention has this structure. It should not be limited to, and may be formed in any of various known structures.

Therefore, the spirit of the present invention should not be limited to the above-described embodiments, and all modifications equivalent or equivalent to the claims as well as the following claims fall within the scope of the spirit of the present invention. something to do.

100: wheel bearing
110: wheel hub
120: inner ring
130: paddle
140: rolling element
200: Sealing member
210: Slinger
212: press-fitting part
214: radial extension
216: axial extension
218: Auxiliary extension
220: Elastic sealing part
222: Elastic sealing lip
224: End sealing lip
230: Auxiliary sealing part

Claims (9)

A wheel hub 110 on which the wheel of the vehicle is mounted, an outer wheel 130 disposed on a radial outer side of the wheel hub 110 and mounted on the body of the vehicle, and the wheel hub 110 and the outer wheel 130 A wheel bearing 100 for a vehicle including a rolling element 140 disposed therebetween and a sealing member 200 that seals between the wheel hub 110 and the outer ring 130,
The sealing member 200 includes a slinger 210 mounted and fixed to the wheel hub 110 and an elastic sealing part 220 attached to the slinger 210,
The slinger 210 is,
A press-fitting portion 212 that is press-fitted and mounted on the outer peripheral surface of the wheel hub 110,
a radial extension portion 214 extending radially outward from the press-fit portion 212;
an axial extension portion 216 extending axially from a radially outer end of the radial extension portion 214;
It includes an auxiliary extension part 218 extending radially outward from the inner end of the press-fitting part 212,
The axial extension portion 216 of the slinger 210 is configured to partially surround the outer peripheral surface of the outer ring 130,
The elastic sealing part 220 is provided on the axial extension part 216 of the slinger 210,
The elastic sealing portion 220 includes one or more elastic sealing lips 222 that contact one side of the outer ring 130 to perform sealing,
The auxiliary extension portion 218 has a height of more than half of the radial gap formed between the outer peripheral surface of the wheel hub 110 on which the press-fitting portion 212 of the slinger 210 is mounted and the inner peripheral surface of the outer ring 130 opposing it. extends to,
An annular space (S) is formed around the rotation axis of the wheel bearing by the radial extension part 214, the press-fitting part 212, and the auxiliary extension part 218,
Vehicle wheel bearings. delete delete delete delete According to paragraph 1,
An auxiliary sealing part 230 is further provided at the end of the auxiliary extension part 218,
Vehicle wheel bearings. According to clause 6,
The auxiliary sealing part 230 is formed in the form of a sealing lip extending in one direction, and the end of the sealing lip is configured to contact one side of the outer ring 130 to perform sealing.
Vehicle wheel bearings. In clause 7,
The elastic sealing lip 222 and the auxiliary sealing part 230 of the elastic sealing part 220 are configured to extend in an inclined direction with respect to the rotation axis of the wheel bearing.
Vehicle wheel bearings. According to clause 8,
The elastic sealing lip 222 of the elastic sealing portion 220 is configured to be inclined to move toward the end in the opposite direction of the radial extension portion 214 of the slinger 210.
Vehicle wheel bearings.

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