KR20240040714A - Sealing device and wheel bearing assembly - Google Patents

Abstract

According to one embodiment of the present disclosure, a sealing device used in a wheel bearing assembly and disposed between an outer ring portion and an inner ring portion that rotate relative to each other is provided. The sealing device includes a first frame coupled to the outer ring portion, a second frame coupled to the inner ring portion, a first engaging portion coupled to the first frame, and a contact lip extending from the first engaging portion to contact the second frame. ) may include a first sealing member including a first sealing member, a second coupling portion attached to the axial outer surface of the second frame, and a second sealing member including a non-contact lip extending from the second coupling portion toward the first sealing member. You can. The contact lip may be arranged radially outward than the non-contact lip.

Description

Sealing device and wheel bearing assembly {SEALING DEVICE AND WHEEL BEARING ASSEMBLY}

The present disclosure relates to sealing devices and wheel bearing assemblies.

A wheel bearing assembly is a device that is mounted between a rotating element and a non-rotating element to facilitate the rotation of the rotating element. The wheel bearing assembly of a vehicle provides the ability for the vehicle to move by rotatably connecting the wheels to the vehicle body. These wheel bearing assemblies can be divided into driving wheel bearings that transmit power generated from the engine and driven wheel bearings that do not transmit driving force.

The drive wheel bearing assembly includes a rotating element and a non-rotating element. The rotating element is designed to rotate with the drive shaft by torque generated from the engine and passed through the transmission. In contrast, the non-rotating element is fixed to the vehicle body, and a power transmission device is interposed between the rotating element and the non-rotating element. The follower wheel bearing assembly includes similar construction to the drive wheel bearing assembly, but the rotating element is not connected to the drive shaft.

A sealing device may be installed between the rotating element and the non-rotating element to block the inflow of foreign substances. One part of the sealing device may be coupled to the rotating enzyme, and the other part may be coupled to the non-rotating element. The sealing device can block the inflow of foreign substances through a contact method or a non-contact method. If the contact method is used, problems of heat generation or wear may occur, and if the non-contact method is used, the sealing property may be deteriorated.

One embodiment of the present disclosure provides a sealing device in which a contact lip is disposed radially outward with respect to a non-contact lip so as to simultaneously secure low torque (reduction of friction) and sealing performance.

A sealing device used in a wheel bearing assembly according to an embodiment of the present disclosure and disposed between an outer ring portion and an inner ring portion rotating relative to each other, comprising: a first frame coupled to the outer ring portion; a second frame coupled to the inner ring; a first sealing member including a first coupling portion coupled to the first frame and a contact lip extending from the first coupling portion to contact the second frame; and a second sealing member including a second engaging portion attached to the axial outer surface of the second frame and a non-contact lip extending from the second engaging portion toward the first sealing member, wherein the contact lip is stiffer than the non-contact lip. It can be placed outside the direction.

According to one embodiment, the first frame includes a first cylindrical portion press-fitted into the outer ring portion and a first flange portion extending radially inward from the first cylindrical portion, and the second frame includes a second flange portion press-fitted into the inner ring portion. It includes a cylindrical portion and a second flange portion extending radially outwardly from the second cylindrical portion, and the contact lip may contact the second flange portion to have a first amount of interference with the second flange portion.

According to one embodiment, the contact lip includes: a first contact lip portion extending axially inward from the first coupling portion; And it may include a second contact lip portion that extends to be inclined outward in the radial direction from the first contact lip portion and whose tip contacts the second frame.

According to one embodiment, the non-contact lip includes: a first non-contact lip portion extending to be inclined radially outward from the second engaging portion toward the first engaging portion; and a second non-contact lip portion extending from the first non-contact lip portion such that the angle formed with the axial direction is larger than that of the first non-contact lip portion.

According to one embodiment, the non-contact lip may have a shape inclined radially outward from the second coupling portion toward the first coupling portion.

According to one embodiment, the first amount of interference may have a size of 0.05 mm to 0.4 mm.

According to one embodiment, the first sealing member further includes a radial lip extending from the first coupling portion toward the second cylindrical portion, and the radial lip is in contact with the second cylindrical portion to have a second amount of interference with the second cylindrical portion. You can.

According to one embodiment, the second interference amount may have a size of 0.1 mm to 0.3 mm.

According to one embodiment, an encoder attached to the axial inner end surface of the second flange portion may be further included.

According to one embodiment, at least one opening is formed in the second flange portion at a position corresponding to the second coupling portion in the radial direction, and the second sealing member fills the opening to connect the second coupling portion and the encoder. It may further include a connection part.

According to one embodiment, the non-contact lip may be formed by the injection-molded product protruding through the opening when the encoder is injected from the injection-molded product on the axial inner end surface of the second flange portion.

According to one embodiment, the sealing device is such that when the outer ring portion and the inner ring portion rotate relative to each other, the first interference amount is reduced by negative pressure, and the internal air of the wheel bearing assembly is adjusted to the outside of the wheel bearing assembly. As the pressure becomes greater, it may be configured to pass between the contact lip and the second flange portion.

According to one embodiment, the encoder may be made of a material different from the material constituting the second sealing member.

In a wheel bearing assembly according to another embodiment of the present disclosure, an outer ring coupled to a vehicle suspension device; a wheel hub rotating relative to the outer ring; an inner ring coupled to the outer peripheral surface of the wheel hub; A rolling device including a first rolling element interposed between the outer ring and the wheel hub and a second rolling element interposed between the outer ring and the inner ring; and a sealing device interposed between the inner ring and the outer ring, the sealing device comprising: a first frame including a first cylindrical portion press-fitted into the outer ring and a first flange portion extending radially inward from the first cylindrical portion; a second frame including a second cylindrical portion press-fitted into the inner ring and a second flange portion extending radially outward from the second cylindrical portion; a first sealing member including a first engaging portion coupled to the first flange portion and a contact lip extending from the first engaging portion to contact the second flange portion; And it may include a second sealing member including a second coupling portion attached to the axial outer surface of the second flange portion and a non-contact lip extending from the second coupling portion toward the first coupling portion.

According to one embodiment, the contact lip is formed to be inclined radially outward from the first engaging portion, the non-contact lip is formed to be inclined radially outward from the second engaging portion, and the contact lip is formed to be radially outward than the non-contact lip. can be placed.

According to one embodiment, the second frame may further include a bent portion bent outward in the axial direction from the radial outer end of the second flange portion.

According to one embodiment, the second sealing member includes: an encoder attached to the axial inner end surface of the second flange portion; And it may further include a bent seal portion bent outward in the axial direction from the radial outer end of the encoder.

According to embodiments of the present disclosure, since the contact lip is disposed radially outward with respect to the non-contact lip, sealing performance can be improved while reducing friction torque. Additionally, since the non-contact lip extends from the second frame mounted on the inner ring, a labyrinth path can be formed to improve sealing performance.

1 is a cross-sectional view showing the overall configuration of a wheel bearing assembly according to an embodiment of the present disclosure.
Figure 2 is a cross-sectional view showing the configuration of a sealing device according to an embodiment of the present disclosure.
FIG. 3 is a cross-sectional view showing the amount of interference between the contact lip and radial lip shown in FIG. 2 and the second frame.
Figure 4 is a cross-sectional view showing the configuration of a sealing device according to an embodiment of the present disclosure.
FIG. 5 is a perspective view showing the configuration of the second frame of the sealing device shown in FIG. 4.
Figure 6 is a cross-sectional view showing the configuration of a sealing device according to an embodiment of the present disclosure.
Figure 7 is a cross-sectional view showing the configuration of a sealing device according to an embodiment of the present disclosure.

Embodiments of the present disclosure are illustrated for the purpose of explaining the technical idea of the present disclosure. The scope of rights according to the present disclosure is not limited to the embodiments presented below or the specific description of these embodiments.

All technical terms and scientific terms used in this disclosure, unless otherwise defined, have meanings commonly understood by those skilled in the art to which this disclosure pertains. All terms used in this disclosure are selected for the purpose of more clearly explaining this disclosure and are not selected to limit the scope of rights according to this disclosure.

Expressions such as “comprising,” “comprising,” “having,” and the like used in the present disclosure are open terms that imply the possibility of including other embodiments, unless otherwise stated in the phrase or sentence containing the expression. It should be understood as (open-ended terms).

The singular forms described in this disclosure may include plural forms unless otherwise stated, and this also applies to the singular forms recited in the claims.

Expressions such as “first” and “second” used in the present disclosure are used to distinguish a plurality of components from each other and do not limit the order or importance of the components.

In the present disclosure, when a component is referred to as being “connected” to another component, it means that the component can be connected directly to the other component, or can be connected via a new other component. It must be understood.

Hereinafter, embodiments of the present disclosure will be described with reference to the attached drawings. In the accompanying drawings, identical or corresponding components are given the same reference numerals. Additionally, in the description of the following embodiments, overlapping descriptions of identical or corresponding components may be omitted. However, even if descriptions of components are omitted, it is not intended that such components are not included in any embodiment.

In the present disclosure, “axial direction (R)” may be defined to mean a direction parallel to the rotational axis of the wheel bearing assembly, and “radial direction” may be defined to mean a direction away from the rotational axis. may be, and the “circumferential direction” may be defined to mean a direction surrounding the axial direction (R) with the axial direction (R) as the center. Hereinafter, the direction of the rotation axis of the wheel bearing assembly may be simply referred to as “axial direction (R)”.

In the present disclosure, arrow “OA” refers to the direction along the axial direction (R) of the wheel bearing assembly and axially outboard where the wheel is positioned relative to the wheel hub, and arrow “IA” refers to the direction opposite to “OA”. It refers to the axial inboard direction where the knuckle is placed relative to the wheel hub. Additionally, the arrow "OR" points radially outward away from the rotational axis in the radial direction with respect to the rotational axis of the wheel bearing assembly, and the arrow "IR" points radially inward in the opposite direction of OR.

In the present disclosure, the “amount of interference” may be defined as the size (or length) of overlap between two members. For example, the amount of interference between a lip and a frame can be defined as the amount of overlap between the rib and the frame. However, because the lip is bent by external force and elasticity when in contact with the frame, the lip and the frame do not physically overlap each other in the actual state where the sealing device is installed between the inner and outer rings. Therefore, under the assumption that the rib does not bend due to external force or elasticity, if it is assumed that the rib overlaps the frame, the size of the overlap, that is, the size of the tip of the lip exceeding the cross section of the frame, is the "amount of interference" between the lip and the frame. It can be defined as

Figure 1 is a cross-sectional view showing the overall configuration of a wheel bearing assembly 1 according to an embodiment of the present disclosure. The wheel bearing assembly 1 is disposed between the vehicle's suspension (not shown) and a wheel (not shown) to enable rotation of the wheel relative to the suspension. In one embodiment, the wheel bearing assembly 1 may have a shape that is symmetrical about the axial direction (R). For example, the wheel bearing assembly 1 may be comprised of a drive wheel bearing assembly.

The wheel bearing assembly 1 may include a wheel hub 10, an inner ring 20, an outer ring 30, a rolling device 40, and a sealing device 100. The suspension may be arranged on the axially inner side (IA) of the wheel bearing assembly 1, and the wheel may be arranged on the axially outer side (OA) of the wheel bearing assembly 1. Based on FIG. 1, the vehicle body may be located on one side of the wheel bearing assembly 1, and the ground may be located on the other side of the wheel bearing assembly 1.

The wheel hub 10 may include a cylindrical portion 13 extending in the axial direction (R) and a hub flange 12 extending from the cylindrical portion 13 in a radial outward (OR) direction. A hollow 13a penetrating in the axial direction (R) may be formed in the central portion of the cylindrical portion 13. The hub flange 12 may be penetrated in the axial direction (R) and a wheel bolt 51 may be coupled thereto. An orbital forming portion 14 bent radially outwardly (OR) may be formed at an axially inner (IA) end of the cylindrical portion 13. Additionally, a wheel guide portion 11 on which a wheel (not shown) is seated may be formed at an axially outer (OA) end of the cylindrical portion 13.

The inner ring 20 may be press-fitted onto the outer peripheral surface of the cylindrical portion 13 and coupled to the cylindrical portion 13. Accordingly, the inner ring 20 can rotate together with the wheel hub 10. Additionally, the inner ring 20 may be made of a metal material with stronger strength than the wheel hub 10. For example, the inner ring 20 may be press-fitted into the inner ring seating portion 13b formed on the axial inner side (IA) of the wheel hub 10.

The outer ring 30 may be arranged to be spaced apart from each of the wheel hub 10 and the inner ring 20. Additionally, the outer ring 30 may be coupled to one side of a suspension device (not shown). That is, the outer ring 30 may be provided as a non-rotating element and may be configured so that its position does not move after being coupled to one side of the suspension device. The outer ring 30 may be fixed in position by, for example, being coupled to the knuckle arm 53 of the suspension device.

The outer ring 30 includes a first cylindrical portion 32 extending in the axial direction (R), an outer ring flange 31 extending radially outwardly (OR) from the first cylindrical portion 32, and a first cylindrical portion 32. ) may include a second cylindrical portion 33 extending axially inward (IA). The knuckle bolt 52 can penetrate the outer ring flange 31 and the knuckle arm 53 to couple the outer ring 30 and the knuckle arm 53. A sealing device 100 may be interposed between the inner peripheral surface of the second cylindrical portion 33 and the outer peripheral surface of the inner ring 20.

In one embodiment, the rolling device 40 includes a first rolling element 41 interposed between the outer ring 30 and the wheel hub 10 and a second rolling element interposed between the outer ring 30 and the inner ring 20. (42) may be included. The rolling device 40 may include, for example, a retainer 43 that accommodates the first and second rolling elements 41 and 42. As shown in FIG. 1, one part of the first rolling element 41 can roll in contact with the outer ring 30 on the radial outer side (OR), and the other part of the first rolling element 41 is radial. It can roll in contact with the wheel hub 10 in the inner direction (IR). In addition, one part of the second rolling element 42 may roll in contact with the outer ring 30 on the radial outer side (OR), and the other part of the second rolling element 42 may roll on the radial inner side (IR). It can roll in contact with the inner ring (20). In this embodiment, the rolling device 40 includes two rows of rolling elements, but may be configured to include three or more rows of rolling elements depending on the structure of the wheel bearing assembly. Therefore, since the rolling device 40, which includes two or more rows of rolling elements, supports two or more points of the wheel hub 10 and the inner ring 20 that rotate as one body, the wheel hub 10 and the inner ring 20 are connected to the outer ring. It can be rotated stably about (30).

Figure 2 is a cross-sectional view showing the configuration of a sealing device 100 according to an embodiment of the present disclosure. The sealing device 100 may include a first sealing device portion 100A coupled to the outer ring 30 and a second sealing device portion 100B coupled to the inner ring 20. The first sealing device unit 100A may include a first frame 110 press-fitted into the inner peripheral surface 30a of the outer ring 30 and a first sealing member 120 coupled to the first frame 110. The second sealing device unit 100B may include a second frame 130 press-fitted into the outer peripheral surface 20a of the inner ring 20 and a second sealing member 140 coupled to the second frame 130.

The first frame 110 may include a first cylindrical portion 111 press-fitted into the outer ring 30 and a first flange portion 112 extending radially inward (IR) from the first cylindrical portion 111. there is. The outer peripheral surface of the first cylindrical portion 111 may be press-fitted into the inner peripheral surface 30a of the outer ring 30. The second frame 130 may include a second cylindrical portion 131 press-fitted into the inner ring 20 and a second flange portion 132 extending radially outwardly (OR) from the second cylindrical portion 131. there is. The inner peripheral surface of the second cylindrical portion 131 may be press-fitted into the outer peripheral surface 20a of the inner ring 20. The first frame 110 and the second frame 130 may have a generally rectangular shape in the cross-sectional direction.

The first sealing member 120 extends from the first coupling portion 122 coupled to the first frame 110 and the radial outer (OR) tip of the first coupling portion 122 to the axial outer (OA) It may include a cylindrical portion 121. The cylindrical portion 121 may surround the inner peripheral surface and the axial inner (IA) cross section of the first cylindrical portion 111.

The first sealing member 120 may include a contact lip 123 extending from the first coupling portion 122 to contact the second flange portion 132 . The contact lip 123 may contact the second flange portion 132 to have a predetermined amount of interference. In addition, the first sealing member 120 of the first coupling portion 122 It may include a radial lip 125 extending from the radial inner (IR) tip toward the second cylindrical portion 131. The radial lip 125 may contact the second cylindrical portion 131 to have a predetermined amount of interference.

The contact lip 123 has a first contact lip portion 123a extending axially inwardly (IA) from the first coupling portion 122 and inclined radially outwardly (OR) from the first contact lip portion 123a. The tip 123c may be extended to include a second contact lip portion 123b that contacts the second flange portion 132. In this case, the amount of foreign matter accumulated between the first contact lip part 123a and the second contact lip part 123b can be increased, so that the foreign matter can be discharged to the ground after the inner ring 20 is rotated.

The second sealing member 140 connects the first sealing member 120 from the second coupling portion 143 and the second coupling portion 143 attached to the axially outer (OR) end surface of the second flange portion 132. It may include a non-contact lip 144 extending towards. The non-contact lip 144 may be spaced apart from the first sealing member 120 at a predetermined distance so as not to contact the first sealing member 120 .

The non-contact lip 144 includes a first non-contact lip portion 144a and a first non-contact lip portion 144a extending to be inclined radially outwardly (OR) from the second coupling portion 143 toward the first coupling portion 122. ) may include a second non-contact lip portion 144b extending from the first non-contact lip portion 144a so that the angle formed with the axial direction (R) is larger than ). That is, the second non-contact lip portion 144b may have a shape bent radially outward from the first non-contact lip portion 144a.

The second sealing member 140 may include an encoder 141 coupled to the axially inner (IA) end surface of the second flange portion 132. The encoder 141 has a ring shape, and different magnetic poles may be alternately arranged along the circumferential direction. For example, in the encoder 141, N poles and S poles may be alternately arranged, and magnetic pole pairs consisting of N poles and S poles may be arranged in multiple pairs. When the encoder 141 rotates once with the inner ring 20, the magnetic field generated from the encoder 141 changes periodically. A wheel sensor (not shown) located on the outside of the wheel bearing assembly 1 generates a signal in the form of a pulse according to this cycle, and the vehicle's ECU (Electronic Control Unit) determines the rotation angle of the inner wheel 20 based on this signal. , rotation speed, or rotation direction may be configured to generate information.

The contact lip 123 may be disposed radially outer (OR) than the non-contact lip 144. Therefore, the inflow of foreign substances can be primarily blocked by the contact lip 123. Even if the contact lip 123 is worn or damaged and the foreign matter passes through the contact lip 123 and enters the space between the contact lip 123 and the non-contact lip 144, the non-contact lip 144 The inflow of foreign substances can be blocked secondarily. In addition, since the inflow of foreign substances is blocked three times by the radial lip 125, the sealing performance of the sealing device 100 can be maximized.

When the outermost lip close to the sealing surface (e.g., the opening between the cylindrical portion 121 and the bent lip 142 shown in FIG. 2) is formed in a non-contact manner, it has been shown in various ways that the intrusion of foreign substances cannot be effectively prevented. This was confirmed through testing. Based on these test results, in the sealing device 100 according to an embodiment of the present disclosure, the contact lip 123 is arranged at a position close to the sealing surface to ensure sealing properties and to achieve low torque. The non-contact lip 144 that is not in contact with the connection portion 124 is disposed at a position closer to the axial direction (R) than the contact lip 123. By having these structural features, in the sealing device 100 according to an embodiment of the present disclosure, sealing performance is secured through the contact lip 123 and friction is reduced through the non-contact lip 144, thereby reducing sealing performance. There is a technical effect in that all torque can be secured.

The encoder 141 may include a bent lip 142 bent from the radially outer (OR) end of the encoder 141 to the axial outer (OA). A first labyrinth LB1 may be formed between the bent lip 142 and the first sealing member 120. That is, a micro gap is formed between the outer peripheral surface of the bent lip 142 and the inner peripheral surface of the cylindrical portion 121 to block the inflow of foreign substances, and the tip of the bent lip 142 and the corner portion of the first sealing member 120 A micro gap may be formed between (113) to block the inflow of foreign substances.

A second labyrinth LB2 may be formed between the non-contact lip 144 and the first sealing member 120. That is, a micro gap may be formed between the tip of the second non-contact lip portion 144b and the inner peripheral surface of the first contact lip portion 123a to block the inflow of foreign substances. Additionally, a micro gap may be formed between the connection portion 124 of the first sealing member 120 and the axial outer (OA) end surface of the second non-contact lip portion 144b to block the inflow of foreign substances.

The first sealing member 120 may be made of a rubber material. The first sealing member 120 may be formed integrally with the first frame 110 by injecting it from a rubber material. For example, the second coupling portion 143 and the non-contact lip 144 may be made of the same material as the first sealing member 120.

The second coupling portion 143, the non-contact lip 144, and the encoder 141 may be formed by injection molding into the second frame 130 through separate processes. For example, the encoder 141 and the second sealing member 140 may be made of different materials. Additionally, the encoder 141 may be made of a material different from the first sealing member 120. In another embodiment, the coupling portion 143 and the non-contact lip 144 may be made of the same material as the encoder 141.

According to one embodiment, a first groove 1231 that can temporarily accommodate foreign substances may be formed between the first coupling portion 122 and the contact lip 123. Additionally, a second groove 1441 may be formed between the second coupling portion 143 and the non-contact lip 144. The first groove 1231 and the second groove 1441 may be configured to temporarily store foreign substances such as moisture or dust and then discharge them later. For example, when the first groove 1231 and the second groove 1441 are disposed above the ground in the axial direction R, foreign substances can be temporarily stored. In addition, when the first groove 1231 and the second groove 1441 are disposed lower with respect to the ground in the axial direction (R), foreign substances can be discharged to the outside of the sealing device 100 by gravity. . Accordingly, even if foreign matter flows into the interior of the sealing device 100, it can be discharged to the outside rather than inside the wheel bearing assembly due to the rotation of the inner ring 20.

FIG. 3 is a cross-sectional view showing the amount of interference between the contact lip 123 and the radial lip 125 shown in FIG. 2 and the second frame 130. As the amount of interference between the contact lip 123 and the second flange portion 132 increases, sealing performance may be improved, but durability of the contact lip 123 may be reduced due to increased friction torque and heat generation problems. . Therefore, the amount of interference between the contact lip 123 and the second flange portion 132 needs to be adjusted to an appropriate level.

Referring to FIG. 3(a), the contact lip 123 may contact the second flange portion 132 to have a first amount of interference (IF ₁ ) with the second flange portion 132 . For example, the first interference amount IF ₁ may have a size of 0.05 mm to 0.4 mm. In this case, the friction torque between the contact lip 123 and the second flange portion 132 can be minimized. In this way, even if the first interference amount IF ₁ is set small, the sealing performance does not deteriorate because the inflow of foreign substances can be blocked through the non-contact lip 144 and the radial lip 125. In another embodiment, to enhance sealing performance, the first interference amount (IF ₁ ) may have a size of 0.6 mm to 0.7 mm.

Referring to FIGS. 2 and 3(a), the sealing device 100 is configured to reduce the first interference amount IF ₁ by negative pressure when the outer ring 30 and the inner ring 20 rotate relative to each other. You can. That is, the contact lip 123 is lifted radially outwardly (OR) by negative pressure and may be substantially bent axially outwardly (OA). In addition, the internal air of the wheel bearing assembly 1 is between the contact lip 123 and the second flange portion 132 as the internal pressure of the wheel bearing assembly 1 becomes greater than the external pressure of the wheel bearing assembly 1. It can be configured to pass. In this case, small particles or moisture among the foreign substances stored in the second groove 1441 may pass between the contact lip 123 and the second flange portion 132 and be discharged to the outside of the sealing device 100.

Referring to FIG. 3(b), the radial lip 125 may contact the second cylindrical portion 131 to have a second interference amount IF ₂ with the second cylindrical portion 131. For example, the second interference amount (IF ₂ ) may have a size of 0.1 mm to 0.3 mm. In this case, the friction torque between the radial lip 125 and the second cylindrical portion 131 can be minimized.

Figure 4 is a cross-sectional view showing the configuration of a sealing device 200 according to an embodiment of the present disclosure. Redundant description of the configuration described in the above-described embodiment will be omitted. The sealing device 200 may include a first sealing device portion 200A coupled to the outer ring 30 and a second sealing device portion 200B coupled to the inner ring 20. The first sealing device unit 200A may include a first frame 210 press-fitted into the inner peripheral surface 30a of the outer ring 30 and a first sealing member 220 coupled to the first frame 210. The second sealing device unit 200B may include a second frame 230 press-fitted into the outer peripheral surface 20a of the inner ring 20 and a second sealing member 240 coupled to the second frame 230.

The first frame 210 may include a first cylindrical portion 211 and a first flange portion 212 extending from the first cylindrical portion 211 in the radial direction (IR). The second frame 230 may include a second cylindrical portion 231 and a second flange portion 232 extending radially outwardly (OR) from the second cylindrical portion 231. The first sealing member 220 may include a contact lip 223 extending from the first coupling portion 222 to contact the second flange portion 232 . The second sealing member 240 includes a second coupling portion 243 attached to the axially outer (OR) end surface of the second flange portion 232 and a first sealing member 220 from the second coupling portion 243. It may include a non-contact lip 244 extending towards.

At least one opening 233 may be formed in the second flange portion 232 at a position corresponding to the second coupling portion 243 in the radial direction. A plurality of openings 233 may be provided to be arranged along the circumferential direction of the second flange portion 232. In addition, the second sealing member 240 may further include a connection portion 245 that fills the opening 233 and connects the second coupling portion 243 and the encoder 241.

The second sealing member 240 may be formed integrally during the injection process. Accordingly, the encoder 241 and the non-contact lip 244 may be made of the same material. In addition, the non-contact lip 244 may be formed by protruding through the opening 233 when the encoder 241 is injected from an injection molded product on the axial inner (IA) cross section of the second flange portion 232. . Accordingly, the second coupling portion 243 and the encoder 241 of the second sealing member 240 are formed on both cross sections in the axial direction (R) with the second flange portion 232 interposed therebetween, so that the second sealing member 240 (240) may be firmly coupled to the second flange portion (232).

FIG. 5 is a perspective view showing the configuration of the second frame 230 of the sealing device 200 shown in FIG. 4. Referring to FIG. 5, the second cylindrical portion 231 and the second flange portion 232 of the second frame 230 may have shapes perpendicular to each other. A plurality of openings 233 may be formed in the second flange portion 232 along the circumferential direction. The second coupling portion 243 and the encoder 241 may be connected to each other through the opening 233. The plurality of openings 233 may be arranged at equal intervals so as to be uniformly distributed.

When the second sealing member 240 is manufactured, an injection product is first injected into the axial inner (IA) cross section of the second flange portion 232. Next, the injection molded product forms the encoder 241 and the bent lip 242 and exits the axially outer (OA) cross section through the opening 233 to form the second coupling portion 243 and the non-contact lip 244. You can. In this process, the portions of the second coupling portion 243 and the non-contact lip 244 that protrude outwardly in the axial direction (OA) may spread in the circumferential direction and be combined to form a single ring.

Figure 6 is a cross-sectional view showing the configuration of a sealing device 300 according to an embodiment of the present disclosure. Redundant description of the configuration described in the above-described embodiment will be omitted. The sealing device 300 may include a first sealing device portion 300A coupled to the outer ring 30 and a second sealing device portion 300B coupled to the inner ring 20. The first sealing device unit 300A may include a first frame 310 press-fitted into the inner peripheral surface 30a of the outer ring 30 and a first sealing member 320 coupled to the first frame 310. The second sealing device unit 300B may include a second frame 330 press-fitted into the outer peripheral surface 20a of the inner ring 20 and a second sealing member 340 coupled to the second frame 330.

The first frame 310 may include a first cylindrical portion 311 and a first flange portion 312 extending from the first cylindrical portion 311 in the radial direction (IR). The second frame 330 may include a second cylindrical portion 331 and a second flange portion 332 extending radially outwardly (OR) from the second cylindrical portion 331. The first sealing member 320 may include a contact lip 323 extending from the first coupling portion 322 to contact the second flange portion 332 . The second sealing member 340 includes a second coupling portion 343 attached to the axially outer (OR) end surface of the second flange portion 332 and a first sealing member 320 from the second coupling portion 343. It may include a non-contact lip 344 extending towards.

The second frame 330 may include a bent portion 334 bent from the radial outer (OR) end of the second flange portion 332 to the axial outer (OA). The bent portion 334 may be formed parallel to the axial direction (R) or may be formed at a predetermined angle with the axial direction (R). The second sealing member 340 is bent axially outward from the encoder 341 attached to the axially inner (IA) end surface of the second flange portion 332 and the radially outer (OA) end of the encoder 341. It may include a bent sealing portion 342. The bent sealing portion 342 may be formed to surround the outer peripheral surface and the axial outer (OA) cross section of the bent portion 334.

According to the above-described embodiment, a micro gap may be formed between the outer peripheral surface of the bent sealing portion 342 and the inner peripheral surface of the cylindrical portion 321 of the first sealing member 320. Accordingly, a labyrinth path may be formed between the bent sealing portion 342 and the cylindrical portion 321. In addition, the bent portion 344 can fix the shape of the bent sealing portion 342, and since the bent sealing portion 342 does not bend easily even if foreign substances enter, the inflow of foreign substances into the sealing device 300 can be prevented. You can.

Figure 7 is a cross-sectional view showing the configuration of a sealing device 400 according to an embodiment of the present disclosure. Redundant descriptions of the configurations described in the above-described embodiments will be omitted. The sealing device 400 may include a first sealing device portion 400A coupled to the outer ring 30 and a second sealing device portion 400B coupled to the inner ring 20. The first sealing device unit 400A may include a first frame 410 press-fitted into the inner peripheral surface 30a of the outer ring 30 and a first sealing member 420 coupled to the first frame 410. The second sealing device unit 200B may include a second frame 430 press-fitted into the outer peripheral surface 20a of the inner ring 20 and a second sealing member 440 coupled to the second frame 430.

The first frame 410 may include a first cylindrical portion 411 and a first flange portion 412 extending from the first cylindrical portion 411 in the radial direction (IR). The second frame 430 may include a second cylindrical portion 431 and a second flange portion 432 extending radially outwardly (OR) from the second cylindrical portion 431. The first sealing member 420 may include a contact lip 423 extending from the first coupling portion 422 to contact the second flange portion 432 . The second sealing member 440 includes a second coupling portion 443 attached to the axially outer (OR) end surface of the second flange portion 432 and a first sealing member 420 from the second coupling portion 443. It may include a non-contact lip 444 extending towards.

The contact lip 423 may have a shape inclined radially outwardly (OR) from the first coupling portion 422 toward the second flange portion 432. That is, the contact lip 423 may have a shape extending along the first longitudinal direction (L ₁ ). The first longitudinal direction (L ₁ ) may form a predetermined angle with the axial direction (R). In this way, when the shape of the contact lip 423 is simplified, manufacturing costs can be reduced.

The non-contact lip 444 may have a shape inclined radially outwardly (OR) from the second coupling portion 443 toward the connecting portion 424. That is, the non-contact lip 444 may have a shape extending along the second longitudinal direction (L ₂ ). The second longitudinal direction (L ₂ ) may form a predetermined angle with the axial direction (R). The second coupling portion 443 and the non-contact lip 444 may be made of the same material as the encoder 441. The encoder 441 may be made of a rubber magnetic material, and the formability of the rubber magnetic material may be somewhat lower than that of a general rubber material. Therefore, when the non-contact lip 444 is formed along the second longitudinal direction (L ₂ ), the shortcomings of the rubber magnet material can be compensated for.

The structure of the labyrinth seal, which is different from the embodiment of the present disclosure, has a structure in which a non-contact lip is formed on the outer side in the axial direction to reduce the speed and force at which external foreign matter flows into the inside, and prevents foreign matter from entering the wheel bearing assembly. The final inflow of air can be blocked by the contact lip formed on the inner side in the axial direction, but this may damage the contact lip or cause performance deterioration due to the accumulation of foreign substances introduced into the sealing device. In contrast, in the sealing device according to an embodiment of the present disclosure, since the contact lip is installed axially outside the non-contact lip, it is possible to fundamentally block foreign substances from entering the sealing device. Additionally, since the contact lip and the non-contact lip extend in opposite directions, the storage space formed by the contact lip and the storage space formed by the non-contact lip can be arranged in reverse. In addition, both sealing performance and drag performance can be improved by minimizing the amount of interference of the radial lip formed at the bottom in the axial direction.

Although the technical idea of the present disclosure has been described through some embodiments and examples shown in the accompanying drawings, it does not go beyond the technical idea and scope of the present disclosure that can be understood by a person skilled in the art to which the present disclosure pertains. It should be noted that various substitutions, modifications and changes may be made within the scope. Furthermore, such substitutions, modifications and alterations are intended to fall within the scope of the appended claims.

1: Wheel bearing assembly
10: wheel hub
20: Inner ring
30: paddle
40: cloud device
51: wheel bolt
52: knuckle bolt
53: Knuckle Arm
100, 200, 300, 400: Sealing device

Claims (13)

In the sealing device used in a wheel bearing assembly and disposed between the outer ring portion and the inner ring portion rotating relative to each other,
a first frame coupled to the outer ring;
a second frame coupled to the inner ring;
a first sealing member including a first coupling portion coupled to the first frame and a contact lip extending from the first coupling portion to contact the second frame; and
A second sealing member including a second coupling portion attached to an axial outer surface of the second frame and a non-contact lip extending from the second coupling portion toward the first sealing member,
The contact lip is disposed radially outer than the non-contact lip,
The first frame includes a first cylindrical portion press-fitted into the outer ring portion and a first flange portion extending radially inward from the first cylindrical portion,
The second frame includes a second cylindrical portion press-fitted into the inner ring portion and a second flange portion extending radially outward from the second cylindrical portion,
An encoder attached to the axial inner end surface of the second flange portion is further included,
The second sealing member is bent outward in the axial direction from the radial outer end of the encoder and further includes a bent sealing portion extending to surround the outer peripheral surface and the axial outer end surface of the second flange portion,
A first labyrinth path and a second labyrinth path are formed between the bent sealing part and the first sealing member and between the non-contact lip and the first sealing member, respectively.
Sealing device. According to paragraph 1,
The contact lip is,
a first contact lip portion extending axially inward from the first coupling portion; and
Comprising a second contact lip portion that extends to be inclined outward in the radial direction from the first contact lip portion and whose tip contacts the second frame,
Sealing device. According to paragraph 1,
The non-contact lip is,
a first non-contact lip portion extending to be inclined radially outward from the second engaging portion toward the first engaging portion; and
Comprising a second non-contact lip portion extending from the first non-contact lip portion such that the angle formed with the axial direction is larger than that of the first non-contact lip portion,
Sealing device. According to paragraph 1,
The non-contact lip has a shape inclined radially outward from the second engaging portion toward the first engaging portion,
Sealing device. According to paragraph 1,
The contact lip contacts the second flange to have a first amount of interference with the second flange portion,
The first amount of interference has a size of 0.05 mm to 0.4 mm,
Sealing device. According to paragraph 1,
The first sealing member further includes a radial lip extending from the first coupling portion toward the second cylindrical portion,
The radial lip contacts the second cylindrical portion to have a second amount of interference with the second cylindrical portion,
Sealing device. According to clause 6,
The second interference amount has a size of 0.1 mm to 0.3 mm,
Sealing device. According to paragraph 1,
At least one opening is formed in the second flange portion,
The second sealing member further includes a connection part filled in the opening and connecting the second coupling part and the encoder.
Sealing device. According to clause 8,
The non-contact lip is formed when the encoder is injected from an injection molded product on the axial inner end surface of the second flange portion, and the injection molded product protrudes through the opening.
Sealing device. According to paragraph 1,
The encoder is made of a material different from the material constituting the second sealing member,
Sealing device. A paddle wheel coupled to the vehicle's suspension system;
a wheel hub rotating relative to the outer ring;
an inner ring coupled to the outer peripheral surface of the wheel hub;
A rolling device including a first rolling element interposed between the outer ring and the wheel hub and a second rolling element interposed between the outer ring and the inner ring; and
It includes a sealing device interposed between the inner ring and the outer ring,
The sealing device is,
a first frame including a first cylindrical portion press-fitted into the outer ring and a first flange portion extending radially inward from the first cylindrical portion;
a second frame including a second cylindrical portion press-fitted into the inner ring and a second flange portion extending radially outward from the second cylindrical portion;
a first sealing member including a first coupling portion coupled to the first flange portion and a contact lip extending from the first coupling portion to contact the second flange portion; and
A second sealing member including a second coupling portion attached to the axial outer surface of the second flange portion and a non-contact lip extending from the second coupling portion toward the first coupling portion,
The contact lip is disposed radially outer than the non-contact lip,
The second sealing member includes: an encoder attached to an axial inner end surface of the second flange portion; and a bending seal portion that is bent outward in the axial direction from the radial outer end of the encoder and extends to surround the outer circumferential surface and the outer axial end surface of the second flange portion,
A first labyrinth path and a second labyrinth path are formed between the bent sealing part and the first sealing member and between the non-contact lip and the first sealing member, respectively.
Wheel bearing assembly. According to clause 11,
The contact lip is formed to be inclined radially outward from the first engaging portion,
The non-contact lip is formed to be inclined radially outward from the second coupling portion,
Wheel bearing assembly. According to clause 11,
The second frame further includes a bent portion bent outward in the axial direction from the radial outer end of the second flange portion,
The bent sealing portion is formed to surround the outer peripheral surface and the axial outer cross section of the bent portion,
Wheel bearing assembly.