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US-20260126081-A1 - SEAL FOR WHEEL BEARING OF VEHICLE AND WHEEL BEARING FOR VEHICLE COMPRISING SAME

US20260126081A1US 20260126081 A1US20260126081 A1US 20260126081A1US-20260126081-A1

Abstract

A vehicle wheel bearing seal includes a first seal portion including a first support member coupled to an inner ring of a vehicle wheel bearing and a first seal-portion body coupled to the first support member; and a second seal portion including a second support member coupled to an outer ring of the wheel bearing and a second seal-portion body coupled to the second support member. The first support member includes a first cylindrical portion in contact with an outer diameter surface of the inner ring, a first annular portion extending radially outwardly from an axial outer end portion of the first cylindrical portion, and a second cylindrical portion extending axially inwardly from a radial outer end portion of the first annular portion and facing the first cylindrical portion. The second seal-portion body includes a grease rib not to be in contact with the first cylindrical portion.

Inventors

  • Yong Won Kim
  • Seong Kyu Jin

Assignees

  • ILJIN GLOBAL CO., LTD.

Dates

Publication Date
20260507
Application Date
20251229
Priority Date
20230629

Claims (11)

  1. 1 . A vehicle wheel bearing seal ( 400 ), comprising: a first seal portion ( 450 ) including a first support member ( 420 ) coupled to an inner ring ( 120 ) of a vehicle wheel bearing ( 1 ) and a first seal-portion body ( 440 ) coupled to the first support member ( 420 ); and a second seal portion ( 470 ) including a second support member ( 460 ) coupled to an outer ring ( 300 ) of the vehicle wheel bearing ( 1 ) and a second seal-portion body ( 480 ) coupled to the second support member ( 460 ), wherein the first support member ( 420 ) includes a first cylindrical portion ( 422 ) configured to be in contact with an outer diameter surface of the inner ring, a first annular portion ( 424 ) extending in a radially outward direction from an axial outer end portion of the first cylindrical portion ( 422 ), and a second cylindrical portion ( 426 ) extending in an axially inward direction from a radial outer end portion of the first annular portion ( 424 ) and configured to face the first cylindrical portion ( 422 ), and wherein the second seal-portion body ( 480 ) includes a grease rib ( 484 ) configured not to be in contact with the first cylindrical portion ( 422 ).
  2. 2 . The vehicle wheel bearing seal of claim 1 , wherein at least one protrusion ( 486 ) is formed at an axial outer end portion of the second seal-portion body ( 480 ) in a radially inward direction, wherein a stepped portion ( 442 ) is formed in the first seal-portion body ( 440 ) to correspond to the at least one protrusion ( 486 ), and wherein the stepped portion ( 442 ) is formed to be opened in an axially outward direction and the radially outward direction.
  3. 3 . The vehicle wheel bearing seal of claim 2 , wherein the at least one protrusion ( 486 ) has a plurality of protrusions arranged to be spaced apart from each other at equal intervals along an inner peripheral surface of the second seal-portion body ( 480 ).
  4. 4 . The vehicle wheel bearing seal of claim 2 , wherein a first labyrinth ( 10 ) is formed by the at least one protrusion ( 486 ), a second labyrinth ( 20 ) is formed by the stepped portion ( 442 ), a third labyrinth ( 30 ) is formed by the first seal-portion body which covers the second cylindrical portion ( 426 ), and a fourth labyrinth ( 40 ) is formed by the first seal-portion body which covers an end of the second cylindrical portion ( 426 ).
  5. 5 . The vehicle wheel bearing seal of claim 1 , wherein the second support member ( 460 ) includes a third cylindrical portion ( 462 ) configured to be in contact with an inner diameter surface of the outer ring ( 300 ), and a second annular portion ( 464 ) extending in the radially inward direction from an axial outer end portion of the third cylindrical portion ( 462 ), and wherein the second seal-portion body ( 480 ) is configured to cover all of an axial outer surface of the second support member ( 460 ), a radial inner end portion of the second annular portion ( 464 ), and the axial outer end portion of the third cylindrical portion ( 462 ).
  6. 6 . The vehicle wheel bearing seal of claim 2 , wherein an axial interference amount T between the at least one protrusion ( 486 ) and the stepped portion ( 442 ) is 0.1 mm or more.
  7. 7 . The vehicle wheel bearing seal of claim 2 , wherein an inner surface of the at least one protrusion ( 486 ) is formed as an inclined surface.
  8. 8 . The vehicle wheel bearing seal of claim 2 , wherein the stepped portion ( 442 ) is formed in a ring shape along a radial outer peripheral surface of the first seal-portion body ( 440 ).
  9. 9 . The vehicle wheel bearing seal of claim 2 , wherein a length of an outermost diameter flat section of the first seal-portion body ( 440 ) which covers the second cylindrical portion ( 426 ) in the stepped portion ( 442 ) is 1.0 mm or more, and wherein an axial width and a radial depth of the stepped portion ( 442 ) are 0.5 mm or more, respectively.
  10. 10 . The vehicle wheel bearing seal of claim 1 , wherein a recess ( 444 ) is formed in an outer surface of a portion of the first seal-portion body ( 440 ) which covers the first annular portion ( 424 ) to be depressed in the axially inward direction and to be opened in an axially outward direction.
  11. 11 . A vehicle wheel bearing comprising the vehicle wheel bearing seal ( 400 ) of any one of claim 1 .

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/KR2024/006838 filed on May 21, 2024, which claims priority to Korean Patent Application No. 10-2023-0084355 filed on June 29, 2023, the entire contents of which are herein incorporated by reference. TECHNICAL FIELD The present disclosure relates to a vehicle wheel bearing seal, and a vehicle wheel bearing including the same. BACKGROUND A bearing is a device mounted between a rotary element and a non-rotary element to facilitate rotation of the rotary element. A vehicle wheel bearing is one kind of such a bearing, and functions to rotatably connect a wheel, which is a rotary element, relative to a non-rotary vehicle body or a knuckle. Such a vehicle wheel bearing may include an outer ring coupled to the vehicle body, an inner ring coupled to an axle, rolling bodies provided between the inner ring and the outer ring to implement the rotation of the inner ring relative to the outer ring, and a seal member for preventing foreign matters from being introduced into an interior of the vehicle wheel bearing. The seal member may include a seal rib which is in contact with the inner ring to prevent the foreign matters from being introduced into the interior of the vehicle wheel bearing. The seal member may include a plurality of seal ribs. At least some of the plurality of seal ribs are disposed near a support member coupled to the outer ring and are brought into contact with a support member coupled to the inner ring. The seal ribs in contact with the support member are configured to press the support member. In general, the seal member of the vehicle wheel bearing is assembled and transported after manufacture, and then mounted on the vehicle wheel bearing. However, since the seal member is transported in the assembled state so that the seal ribs press the support member coupled to the inner ring, the support member (inner convex portion) coupled to the outer ring and the support member (outer convex portion) coupled to the inner ring may be separated from each other during the transport. SUMMARY The present disclosure was made to solve the above-mentioned matters, and the present disclosure is for the purpose of providing a vehicle wheel bearing seal and a vehicle wheel bearing using the same, which are capable of ensuring a sealing property and reducing a sealing drag torque generated by a seal member, thereby improving a fuel efficiency of a vehicle. A vehicle wheel bearing seal according to an example embodiment of the present disclosure may include: a first seal portion including a first support member coupled to an inner ring of the vehicle wheel bearing and a first seal-portion body coupled to the first support member; and a second seal portion including a second support member coupled to an outer ring of the vehicle wheel bearing and a second seal-portion body coupled to the second support member. The first support member may include a first cylindrical portion configured to be in contact with an outer diameter surface of the inner ring, a first annular portion extending in a radially outward direction from an axial outer end portion of the first cylindrical portion, and a second cylindrical portion extending in an axially inward direction from a radial outer end portion of the first annular portion and configured to face the first cylindrical portion. The second seal-portion body may include a grease rib configured not to be in contact with the first cylindrical portion. In an aspect, at least one protrusion may be formed at an axial outer end portion of the second seal-portion body in a radially inward direction. A stepped portion may be formed in the first seal-portion body so as to correspond to the at least one protrusion. The stepped portion may be formed to be opened in an axially outward direction and the radially outward direction. The at least one protrusion may have a plurality of protrusions arranged to be spaced apart from each other at equal intervals along an inner peripheral surface of the second seal-portion body. According to an example embodiment of the present disclosure, a first labyrinth may be formed by the at least one protrusion, a second labyrinth may be formed by the stepped portion, a third labyrinth may be formed by the first seal-portion body which covers the second cylindrical portion, and a fourth labyrinth may be formed by the first seal-portion body which covers an end of the second cylindrical portion. The second support member may include a third cylindrical portion configured to be in contact with an inner diameter surface of the outer ring, and a second annular portion extending in the radially inward direction from an axial outer end portion of the third cylindrical portion. The second seal-portion body may be configured to cover all of an axial outer surface of the second support member, a radial inner end portion of the second annular portion, and the axial