KR102592737B1 - Wheel bearing for vehicle having reduced drag torque - Google Patents

Abstract

According to one embodiment of the present invention, a wheel bearing is provided to support a wheel of a vehicle by rotatably mounting it on a vehicle body. A wheel bearing according to an embodiment of the present invention includes a wheel hub having a hub flange for mounting a wheel, one or more inner rings that are press-fitted and mounted on one side of the wheel hub, and a radial outer side of the inner ring that is mounted on the outer peripheral surface of the vehicle body. It may include an outer ring having a mounting flange mounted on the outer ring, one or more rolling elements mounted on the radial inner side of the outer ring, and a sealing device that prevents foreign substances from entering the wheel bearing. According to one embodiment of the present invention, the sealing device may include a slinger mounted on the wheel hub and a sealing member mounted on the outer ring. According to one embodiment of the present invention, the slinger has a first mounting portion mounted on the first coupling portion of the wheel hub, is positioned axially and radially spaced apart from the first mounting portion, and is mounted on the second coupling portion of the wheel hub. It may include a second mounting portion, a connection portion connecting the first mounting portion and the second mounting portion, and a radial extension portion extending radially outward from the second mounting portion, and the slinger may include at least one of the first mounting portion and the second mounting portion. It can be configured to be press-fitted and mounted on the wheel hub.

Description

Wheel bearing for vehicle capable of reducing drag torque {Wheel bearing for vehicle having reduced drag torque}

The present invention relates to a vehicle wheel bearing that supports the wheel of a vehicle by rotatably mounted on the vehicle body. More specifically, a vehicle wheel configured to improve operating performance by reducing the drag torque generated from the sealing device when the vehicle is in operation. It's about bearings.

A wheel bearing is a device used to support a vehicle's wheels by rotatably mounting them on the vehicle body. As shown in FIG. 1, a non-rotating element (wheel hub) on which a wheel is mounted is fixed to the vehicle body. It is connected to the element 20 (outer ring) through the rolling element 30 and is configured to support the wheel mounted on the rotating element 10 (wheel hub) by mounting it on the vehicle body in a rotatable state.

Because these wheel bearings are easily exposed to external foreign substances such as dust and moisture due to the nature of the product used by being mounted on the wheels of a vehicle, foreign substances may enter the interior, causing noise during vehicle operation or causing damage to the rolling elements or rolling element raceways. To prevent this from occurring, wheel bearings are used with sealing devices 40 on one or both sides.

Referring to FIG. 2, an example of a conventionally used sealing device 40 for wheel bearings is shown as an example. As shown in Figure 2, the sealing member 40 for a wheel bearing can be configured to perform sealing using a slinger mounted on the wheel hub (or inner ring) and a sealing member provided with an elastic sealing lip mounted on the outer ring. .

For example, the sealing device 40 for wheel bearings is mounted by press-fitting a slinger 42 on one side of the wheel hub 10, etc., and a sealing member consisting of a frame 44 and an elastic sealing lip 46 is installed on the outer ring 20. When installed, sealing may be performed by interaction between the elastic sealing lip 46 of the sealing member and the slinger 42.

Specifically, in the case of the conventional sealing device 40 shown in FIG. 2, the frame 44 of the sealing member is provided with a plurality of elastic sealing lips 46a, 46b, and 46c extending toward the slinger, and such elastic sealing The lips 46a, 46b, and 46c are configured to contact one side of the slinger 42 to perform sealing.

However, in order to improve the sealing performance in a sealing device of this structure, it is necessary to increase the number of elastic sealing lips in contact with the slinger or to form thicker elastic sealing lips. In this way, the number or thickness of elastic sealing lips must be increased. If this is done, a large frictional resistance is generated at the contact area between the slinger and the elastic sealing lip when the vehicle is in operation, which increases drag torque, which may lead to a decrease in the vehicle's drivability and fuel efficiency.

In particular, the 4th generation wheel bearings (wheel bearings with a structure in which all or part of the constant velocity joint is inserted and joined into the vehicle body end of the wheel hub) have been recently proposed to reduce the axial length of the wheel bearing assembly and improve power transmission efficiency. ), in order to accommodate the constant velocity joint inside the wheel hub, the diameter of the wheel hub is enlarged and the pitch circle diameter of the rolling element mounted on the wheel hub must be increased, so the drag torque generated from the sealing device increases significantly. There is a risk of doing so.

Therefore, in the field of vehicle wheel bearings, there is a demand for the development of a sealing device that can reduce drag torque generated during vehicle operation without deteriorating sealing performance.

Korean Patent No. 10-1826200 (Registration date: 2018.1.31)

The present invention is intended to solve the above-mentioned problems of conventional wheel bearings for vehicles, and its purpose is to provide a wheel bearing for vehicles equipped with a sealing device that can reduce drag torque generated during vehicle operation.

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 is provided to support a wheel of a vehicle by rotatably mounting it on a vehicle body. A wheel bearing according to an embodiment of the present invention includes a wheel hub having a hub flange for mounting a wheel, one or more inner rings that are press-fitted and mounted on one side of the wheel hub, and a radial outer side of the inner ring that is mounted on the outer peripheral surface of the vehicle body. It may include an outer ring having a mounting flange mounted on the outer ring, one or more rolling elements mounted on the radial inner side of the outer ring, and a sealing device that prevents foreign substances from entering the wheel bearing. According to one embodiment of the present invention, the sealing device may include a slinger mounted on the wheel hub and a sealing member mounted on the outer ring. According to one embodiment of the present invention, the slinger has a first mounting portion mounted on the first coupling portion of the wheel hub, is positioned axially and radially spaced apart from the first mounting portion, and is mounted on the second coupling portion of the wheel hub. It may include a second mounting portion, a connection portion connecting the first mounting portion and the second mounting portion, and a radial extension portion extending radially outward from the second mounting portion, and the slinger may include at least one of the first mounting portion and the second mounting portion. It can be configured to be press-fitted and mounted on the wheel hub.

According to one embodiment of the present invention, one of the first mounting part and the second mounting part may be formed as a main press-fitting part, and the other may be formed to have a smaller or equal amount of interference with the wheel hub than the mounting part that becomes the main press-fitting part.

According to one embodiment of the present invention, the slinger can be mounted by being press-fitted into the wheel hub, with the second mounting portion becoming the main press-fitting portion.

According to one embodiment of the present invention, the sealing member includes a frame that is press-fitted and mounted on the outer ring and an elastic sealing portion attached to the frame, and the elastic sealing portion includes one or more elastic sealing lips whose ends contact the radial extension portion of the slinger. This may be included.

According to one embodiment of the present invention, the radial extension portion of the slinger may be configured to be located at a position spaced apart from the wheel side end of the outer wheel to the wheel side.

According to one embodiment of the present invention, the slinger may further include an axial extension portion extending axially from the radial extension portion.

According to one embodiment of the present invention, the axial extension part may be configured to partially surround the radial outer side of the outer ring to form a labyrinth structure between the axial extension part and the outer peripheral surface of the outer ring.

According to one embodiment of the present invention, the elastic sealing part may further include one or more auxiliary sealing lips that contact the first mounting part of the slinger.

According to one embodiment of the present invention, a dam portion extending radially outward may be further provided at the radially outer end of the elastic sealing portion.

According to one embodiment of the present invention, the dam portion may be bent and inclined in a direction surrounding the axial extension portion of the slinger, thereby forming a labyrinth structure between the dam portion and the axial extension portion.

According to one embodiment of the present invention, the sealing device may be mounted between the wheel hub and the outer ring on the wheel side of the wheel bearing.

According to one embodiment of the present invention, a receiving space into which a constant velocity joint is inserted may be provided at the end of the wheel hub on the vehicle body side.

According to one embodiment of the present invention, a plurality of recesses for accommodating the rotation elements of the constant velocity joint may be formed on the inner peripheral surface of the wheel hub where the accommodation space is located, spaced apart along the circumferential direction.

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.

In the vehicle wheel bearing according to an embodiment of the present invention, the slinger forming the sealing device is formed in a two-stage structure, so that the radial extension parts that contact the elastic sealing lip and perform sealing can be arranged to be spaced more apart, so that the slinger's The length of the elastic sealing lip that contacts the radial extension part to perform sealing is increased, thereby reducing the drag torque generated during vehicle operation.

In addition, the vehicle wheel bearing according to an embodiment of the present invention is configured to press fit the slinger to the wheel hub using one of the plurality of mounting surfaces provided in the two-stage structure of the slinger, and the other mounting surface is the slinger. Since no large external force is applied during installation, deformation can be suppressed. Therefore, even when the elastic sealing lip is in contact with the mounting surface, the amount of interference of the sealing lip can be kept constant, thereby suppressing the increase in drag torque due to an increase in the amount of interference of the sealing lip. It becomes possible.

Figure 1 exemplarily shows the structure of a conventional vehicle wheel bearing (a third-generation wheel bearing).
Figure 2 exemplarily shows the structure of a sealing device used in a conventional vehicle wheel bearing.
Figure 3 exemplarily shows the overall structure of a wheel bearing for a vehicle according to an embodiment of the present invention.
Figure 4 exemplarily shows the cross-sectional structure of a wheel bearing for a vehicle according to an embodiment of the present invention.
Figure 5 exemplarily shows the structure of a sealing device that can be used in a wheel bearing for a vehicle according to an embodiment of the present invention.
Figure 6 exemplarily shows the structure of a portion where the sealing device is mounted in the wheel hub of a wheel bearing for a vehicle according to an embodiment of the present invention.

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 6, 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 112 is provided near the wheel side end of the wheel hub 110. It can be. The hub flange 112 is formed in a shape that extends radially outward along the circumferential direction of the wheel hub 110, and can be used to mount a wheel to the wheel hub 110 using a hub bolt or the like. Meanwhile, a step portion 114 may be formed at the body side end 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 peripheral surface of the wheel hub 110. It may be configured to support the rolling element 140 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 into the step portion 114 formed at the vehicle body-side end of the wheel hub 110 and plastically deforms the end of the wheel hub 110 or the vehicle body-side end of the wheel hub 110. It may be configured to be seated and maintained on the wheel hub 110 by fastening a nut, etc. 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 132 on the outer peripheral 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 the inner peripheral surface. there is. 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 located on the radial inner side of the outer ring 130, that is, the raceway (inner raceway) formed on the wheel hub 110 and/or the inner ring 120 and the raceway (outer raceway) formed on the outer ring 120. surface), it can perform the function of rotatably supporting the wheel hub 110 on which the wheel is mounted with respect to the outer wheel 130 fixed to the vehicle body.

Meanwhile, according to an embodiment of the present invention, a sealing device 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 (greas) from leaking. You can. For example, referring to FIG. 5, a sealing device (eg, a wheel side sealing device) that can be applied to the wheel bearing 100 according to an embodiment of the present invention is shown as an example.

According to one embodiment of the present invention, the sealing device 200 is mounted on the slinger 210 and the outer ring 130 mounted on the wheel hub 110, as shown in FIG. 5, to interact with the slinger 210. It may include a sealing member 220 that performs sealing.

According to one embodiment of the present invention, the slinger 210 includes a first mounting portion 210a mounted on the first coupling portion 116a of the wheel hub 110, and a second coupling portion 116b of the wheel hub 110. ), a second mounting part 210b mounted on the radial direction, a connection part 210c connecting the first mounting part 210a and the second mounting part 210b, and a radial direction extending outward from the second mounting part 210b. It may be configured to include an extension portion 210d and an axial extension portion 210e extending in the axial direction from a radially outer end of the radial extension portion 210d.

According to one embodiment of the present invention, the slinger 210 may be configured to be press-fitted and mounted on the wheel hub 110 using one or more of the first mounting portion 210a and the second mounting portion 210b. For example, in the slinger 210, one of the first mounting part 210a and the second mounting part 210b becomes the main press-fitting part and is mounted on the wheel hub, and the other one has the same amount of interference with the wheel hub as the main press-fitting part. It may be formed to be small and configured to assist the main press-fitting unit. For example, according to one embodiment of the present invention, the slinger 210 is forcibly press-fitted and mounted on the wheel hub 110 through the second mounting part 210b, and the first mounting part 210a is attached to the slinger on the wheel hub 110. It may be configured to assist in mounting and fixing (210).

In the case of the embodiment shown in the drawing, the first mounting portion 210a of the slinger 210 is larger than the outer diameter of the corresponding coupling portion (first coupling portion 116a) formed on the coupling portion 116 of the wheel hub 110. It is formed to have a slightly larger diameter, and the second mounting portion 210b of the slinger 210 is formed to have a diameter slightly smaller than the outer diameter of the corresponding coupling portion (second coupling portion 116b) of the wheel hub 110. The second mounting part 210b becomes the main press-fitting part and the slinger 210 is forcibly press-fitted and mounted on the wheel hub 110. At this time, the first mounting part 210a is coupled to the slinger 210 with a loose fit to form a slinger ( 210) is configured to assist in mounting and fixing.

As in the embodiment shown in the drawing, when the slinger 210 is configured to be press-fitted into the wheel hub 110 using the second mounting part 210b, the slinger 210 is closer to the center of the slinger than when press-fitting using the first mounting part 210a. Press-fitting occurs at the site, making more stable installation possible, and when the slinger 210 is press-fitted and mounted on the wheel hub 110, no deformation occurs in the first mounting portion 210a, so as described later, the first mounting portion (210a) Even if the auxiliary sealing lip is used in contact with 210a), the amount of interference of the sealing lip is kept constant, thereby preventing an unintentional increase in drag torque.

According to one embodiment of the present invention, the second mounting part 210b may be configured to be disposed at a position spaced apart from the first mounting part 210a in the axial and radial directions. In this way, when the second mounting part 210b is arranged to be spaced apart from the first mounting part 210a in the axial and radial directions, the radial extension part 210d of the slinger 210 is spaced further apart from the sealing member 220. Since it can be placed in a certain position, a space can be secured to form a longer elastic sealing lip (first elastic sealing lip 224a) of the sealing member 220, as will be described later.

Meanwhile, according to one embodiment of the present invention, when assembling the slinger 210 with the first coupling portion 116a of the wheel hub 110 on which the first mounting portion 210a of the slinger 210 is mounted, the slinger 210 An inwardly recessed undercut 116d may be formed at a corner between the connection portion 210c and the connection end 116c of the wheel hub 110 (see FIG. 6). In this way, when the undercut 116d is formed between the first coupling portion 116a and the connecting end 116c, the slinger 210 is formed by the undercut 116d when the slinger 210 is mounted on the wheel hub 110. It is possible to prevent the corner portion between the first mounting portion 210a and the connecting portion 210c of ) from interfering with the wheel hub and interfering with assembly, and as a result, the connecting portion 210c of the slinger 210 is connected to the connecting end 116c. ), stable assembly without interference can be achieved even if the assembly is pushed to the position where it contacts.

According to one embodiment of the present invention, the radial extension portion 210d of the slinger 210 is formed to extend radially outward from one end of the second mounting portion 210b, and is in contact with or spaced apart from one side of the wheel hub. It can be configured to be mounted in a state. According to one embodiment of the present invention, the radial extension portion 210d of the slinger 210 may be configured to be located at a position spaced apart from the wheel side end of the outer ring 130 toward the wheel side. In the embodiment shown in the drawing, the radial extension portion 210d is configured to extend radially outward perpendicular to the axial direction, but the radial extension portion 210d 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 210e of the slinger 210 extends axially from the radially outer end of the radial extension portion 210d and is configured to surround the radial outer side of the outer ring 130 near the end of the outer ring 130. It can be. In this way, when the axial extension portion 210e is formed at the outer end of the slinger 210, a more complex labyrinth structure can be formed between the outer ring 130 and the slinger 210, preventing external foreign substances from entering. Prevention can be done more effectively. 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 210e 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.

Meanwhile, according to an embodiment of the present invention, the sealing device 200 provided with the wheel bearing 100 may be further provided with a sealing member 220 that performs a sealing function together with the slinger 210. For example, the sealing member 220 may be mounted on one side of the outer ring 130 and interact with the slinger 210 to prevent external foreign substances from entering or internal lubricating oil from leaking.

According to one embodiment of the present invention, the sealing member 220 includes a frame 222 mounted on one side of the outer ring 130 and an elastic sealing portion 224 attached to all or part of the frame 222. can do.

According to one embodiment of the present invention, the frame 222 is a part of the body of the sealing member 220 and may be formed by bending a metal plate, etc. For example, the frame 222 may be configured to include a press-fitting portion that is press-fitted and mounted on the outer ring 130 and an extension portion that extends radially inward from the press-fitting portion.

For example, in the case of the embodiment shown in the drawing, a press-fitting portion having an approximately U-shaped cross-sectional structure so as to surround one end of the outer ring 130 (an end mounting portion 222a in contact with the axial cross-section of the outer ring and the radial direction of the outer ring) A U-shaped press-fitting portion formed by an inner extension portion 222b extending inward and an outer extension portion 222c extending radially outward of the outer ring] and an extension portion 222d extending radially inward from this press-fitting portion. It may be configured to include.

Meanwhile, according to one embodiment of the present invention, all or part of the frame 222 that is press-fitted and mounted on the outer ring 130 may be provided with an elastic sealing portion 224 made of an elastic material such as rubber.

According to one embodiment of the present invention, the elastic sealing portion 224 of the sealing device 200 includes a frame 222 (specifically, an inner extension portion 222b extending in a direction away from the slinger 210). An elastic sealing lip (first elastic sealing lip (224a)) extending in an inclined direction from the extension portion (222d) toward the slinger 210 is provided to form an elastic sealing lip (first elastic sealing lip (224a)). It may be configured to perform sealing by contacting the radial extension portion 210d of the slinger 210.

The sealing device 200 used in the wheel bearing 100 according to an embodiment of the present invention has an elastic sealing lip (first elastic sealing lip 224a) of the elastic sealing portion 224 that is the first elastic sealing lip of the slinger 210. So as not to contact the cross section extending from the end of the mounting portion 210a (in the case of the embodiment shown in the drawing, the connecting portion 210c) but to contact the radial extension portion 210d disposed at a more spaced position in the axial direction therefrom. Because it is configured, the length of the elastic sealing lip (first elastic sealing lip (224a)) provided on the sealing member 220 can be longer, thereby reducing the drag torque generated by contact between the elastic sealing lip and the slinger during vehicle operation. can be reduced.

Meanwhile, according to one embodiment of the present invention, the elastic sealing part 224 may be further provided with one or more auxiliary sealing lips that perform sealing between the elastic sealing part 224 and the first mounting part 210a of the slinger 210. In the embodiment shown in the drawing, the elastic sealing portion 224 is provided with two auxiliary sealing lips (second elastic sealing lip 224b and third elastic sealing lip 224c), and one end of these is connected to the slinger 210. It is configured to improve the sealing performance of the sealing device by contacting the first mounting portion 210a.

According to one embodiment of the present invention, a dam portion 224d extending radially outward may be further provided on the radially outer portion of the sealing member 220. For example, the dam portion 224d may be formed in an inclined structure so that its diameter increases as it moves toward the slinger 210, and may be configured to surround the end of the slinger 210, and may be spaced apart from the slinger 210 without contacting it. It may be configured to be mounted. According to this structure, a more complex labyrinth structure is formed at the entrance of the slinger 210 by the dam portion 224d, making it possible to more effectively prevent external foreign substances from entering the wheel bearing.

Meanwhile, according to one embodiment of the present invention, a constant velocity joint may be inserted and installed on the inner peripheral surface of the vehicle body side end of the wheel hub 110. For example, the wheel bearing 100 according to an embodiment of the present invention is provided with a receiving space 118 for accommodating the constant velocity joint at the center of the vehicle body side end of the wheel hub 110, and the constant velocity joint is stored in the receiving space 118. All or part of may be configured to be inserted and mounted. In addition, a recess 118a is provided on the inner peripheral surface of the end of the vehicle body side of the wheel hub 110 where the receiving space 118 is formed to accommodate the rotation element of the constant velocity joint, and the rotation of the constant velocity joint is provided in this recess 118a. The elements may be configured to be accommodated and combined, and a plurality of such recesses 118a may be provided spaced apart along the circumferential direction by a number corresponding to the number of rotation elements provided in the constant velocity joint.

As described above, the wheel bearing 100 according to an embodiment of the present invention forms the slinger 210, which constitutes the sealing device 200, in a two-stage structure and has an elastic mechanism that performs sealing by contacting the slinger 210. Since the sealing lip (first elastic sealing lip 224a) is configured to be formed to a longer length, the drag torque generated at the contact area between the slinger and the sealing lip can be reduced by the longer contact sealing lip. It becomes possible. Therefore, even if the wheel bearing is formed using the 4th generation method of inserting and joining the constant velocity joint into the body side end of the wheel hub, it is possible to prevent the problem of lowering the fuel efficiency of the vehicle due to increased drag torque due to the large diameter of the wheel hub. Even if the wheel bearing is configured with a 4th generation structure, the performance and lifespan of the wheel bearing can be stably secured.

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 above-described embodiment, the wheel bearing according to the present invention was explained using the so-called 4th generation wheel bearing in which the constant velocity joint is inserted and coupled to the inside of the wheel hub. However, the wheel bearing according to the present invention should be limited to this structure. This does not mean that it can be formed in any other structure, including the so-called 3rd generation wheel bearing shown in FIGS. 1 and 2. In addition, in the previously described embodiment, the sealing device was described as being mounted on the wheel side of the wheel bearing and the sealing member is press-fitted into the outer peripheral surface of the outer ring. However, the sealing device according to the present invention is not limited to this structure and is installed on the inner peripheral surface of the outer ring. It may be implemented as a sealing device with a press-fit structure or as a sealing device mounted on the vehicle body.

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
112: hub flange
114: Step part
116: coupling part
116a: first coupling portion
116b: second coupling portion
116c: connection end
116d: undercut
120: inner ring
130: paddle
132: Mounting flange
140: rolling element
200: Sealing device
210: Slinger
210a: first mounting portion
210b: second mounting portion
210c: connection part
210d: radial extension
210e: axial extension
220: Sealing member
222: frame
224: Elastic sealing part
224a: first elastic sealing lip
224b: second elastic sealing lip
224c: third elastic sealing lip
224d: Dam part

Claims (13)

It is a vehicle wheel bearing (100) that supports the vehicle wheel by rotatably mounting it on the vehicle body,
A wheel hub 110 having a hub flange for mounting a wheel,
One or more inner rings 120 press-fitted and mounted on one side of the wheel hub,
An outer ring (130) mounted on the radial outer side of the inner ring and having a mounting flange on the outer circumferential surface mounted on the vehicle body,
One or more rolling elements 140 mounted on the radial inner side of the outer ring 130,
It includes a sealing device 200 that prevents foreign substances from entering the wheel bearing,
The sealing device 200 includes a slinger 210 mounted on the wheel hub and a sealing member 220 mounted on the outer ring,
The slinger 210 has a first mounting portion 210a mounted on the first coupling portion 116a of the wheel hub 110, and is positioned axially and radially spaced apart from the first mounting portion 210a. A second mounting portion 210b mounted on the second coupling portion 116b of the wheel hub 110, a connecting portion 210c connecting the first mounting portion and the second mounting portion, and a radial direction from the second mounting portion. It includes a radial extension portion (210d) extending outward,
The slinger 210 is press-fitted and mounted on the wheel hub 110 through one or more of the first mounting part 210a and the second mounting part 210b,
The sealing member 220 includes a frame 222 that is press-fitted and mounted on the outer ring 130, and an elastic sealing portion 224 attached to the frame 222,
The elastic sealing portion 224 includes one or more elastic sealing lips whose ends contact the radial extension portion 210d of the slinger,
The point where the radially outermost elastic sealing lip of the one or more elastic sealing lips contacts the radial extension portion 210d of the slinger is located in a radial direction compared to the first mounting portion 210a and the second mounting portion 210b. located on the outside,
Vehicle wheel bearings. According to paragraph 1,
One of the first mounting portion 210a and the second mounting portion 210b becomes the main press-fitting portion, and the other is formed to have a smaller or equal amount of interference with the wheel hub 110 than the mounting portion serving as the main press-fitting portion.
Vehicle wheel bearings. According to paragraph 2,
The slinger 210 is mounted by press-fitting the second mounting portion 210b into the wheel hub 110 as the main press-fitting portion,
Vehicle wheel bearings. delete According to paragraph 1,
The radial extension portion 210d of the slinger 210 is located at a position spaced apart from the wheel side end of the outer ring 130 toward the wheel side.
Vehicle wheel bearings. According to clause 5,
The slinger 210 further includes an axial extension portion 210e extending axially from the radial extension portion 210d.
Vehicle wheel bearings. According to clause 6,
The axial extension portion 210e is configured to partially surround the radial outer side of the outer ring 130 to form a labyrinth structure between the axial extension portion 210e and the outer peripheral surface of the outer ring 130.
Vehicle wheel bearings. In clause 7,
The elastic sealing portion 224 further includes one or more auxiliary sealing lips in contact with the first mounting portion 210a of the slinger 210.
Vehicle wheel bearings. According to clause 8,
A dam portion 224d extending radially outward is further provided at the radially outer end of the elastic sealing portion 224,
Vehicle wheel bearings According to clause 9,
The dam portion 224d is bent and inclined in a direction surrounding the axial extension portion 210e of the slinger 210, thereby forming a labyrinth structure between the dam portion 224d and the axial extension portion 210e.
Vehicle wheel bearings. According to clause 10,
The sealing device 200 is mounted between the wheel hub 110 and the outer wheel 130 on the wheel side of the wheel bearing.
Vehicle wheel bearings. According to any one of claims 1 to 3 and 5 to 11,
A receiving space 118 in which a constant velocity joint is inserted is provided at the vehicle body side end of the wheel hub 110,
Vehicle wheel bearings. According to clause 12,
On the inner peripheral surface of the wheel hub 110, where the receiving space 118 is located, a plurality of recesses 118a for accommodating the rotation element of the constant velocity joint are formed, spaced apart along the circumferential direction.
Vehicle wheel bearings.

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