Knee airbag assemblies and related methods

• US 8,500,157 B2
• Filed: 10/11/2011
• Issued: 08/06/2013
• Est. Priority Date: 04/27/2009
• Status: Active Grant

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Schneider, David W., Kutchey, Michael, Fritz, Jamie R., Enders, Mark L., Mueller, Louis, Lunt, Larry, Witt, John F.
• Primary Examiner(s): BROWN, DREW J
• Application Number:
  US13/270,462
• Publication Number:
  US 20120025496A1
• Time in Patent Office: 665 Days
• Field of Search: 280/730.1, 280/728.2, 280/732, 280/743.1, 280/743.2
• US Class Current: 280/728.2
• CPC Class Codes: B60R 2021/23169 specially adapted for knee protection
• CPC Class Codes: B60R 2021/23386 External tether means
• CPC Class Codes: B60R 21/201 Packaging straps or envelopes for inflatable members
• CPC Class Codes: B60R 21/2171 specially adapted for elongated cylindrical or bottle-like inflators with a symmetry axis perpendicular to the main direction of bag deployment, e.g. extruded reaction canisters B60R21/2176 takes precedence
• CPC Class Codes: B60R 21/231 characterised by their shape, construction or spatial configuration
• CPC Class Codes: B60R 21/2338 Tethers
• CPC Class Codes: B60R 21/237 characterised by the way they are folded
• CPC Class Codes: Y10T 29/49826 Assembling or joining

Abstract

An airbag assembly can include a stabilizer strap attached to an airbag, and the stabilizer strap can cooperate with a housing to prevent undesired rotation or skewing of the airbag during deployment. In some arrangements, a portion of the airbag is secured to the housing via an inflator.

Claims

1. An airbag assembly comprising:

a housing elongated in a longitudinal direction such that a longitudinal axis of the housing extends between a first end and a second end of the housing, wherein the housing comprises a mounting component that is closer to the first end of the housing than it is to the second end;

an inflator coupled to the housing at a position that is closer to the second end of the housing than is the mounting component, wherein the inflator is configured to be activated in response to vehicle conditions as detected by one or more vehicle sensors;

an inflatable airbag cushion that is coupled to the housing; and

a stabilizer strap coupled to a portion of the inflatable airbag cushion and coupled to the mounting component of the housing to be retained by the mounting component, wherein an entirety of the stabilizer strap is closer to the first end of the housing than it is to the second end,

wherein the stabilizer strap is configured to prevent the portion of the inflatable airbag cushion that is coupled to the stabilizer strap from rotating about the position at which the inflator is coupled to the housing so as to inhibit skewing of the inflatable airbag cushion during deployment thereof, and

wherein the mounting component is configured to retain the stabilizer strap throughout a full deployment of the inflatable airbag cushion whenever the vehicle conditions are such that the inflator is activated.

2. The airbag assembly of claim 1, wherein the stabilizer strap is configured to prevent skewing of the inflatable airbag cushion about a central rotational axis of the airbag assembly that is within a plane that bisects the longitudinal axis of the housing and is perpendicular to a direction of deployment of the inflatable airbag cushion.

3. The airbag assembly of claim 1, wherein the mounting component of the housing comprises a catch that projects outwardly from a surface of the housing, and wherein a portion of the stabilizer strap extends about the catch.

4. The airbag assembly of claim 1, wherein the mounting component of the housing comprises a stabilizer opening through the housing that is separate from and smaller than a deployment opening of the housing through which the inflatable airbag cushion is configured to be deployed.

5. The airbag assembly of claim 4, wherein the stabilizer strap extends through the stabilizer opening from a position at an interior of the housing, and wherein a portion of the stabilizer strap is configured to be retained at an exterior of the housing during deployment of the inflatable airbag cushion.

6. The airbag assembly of claim 5, wherein the portion of the stabilizer strap that is positioned at an exterior of the housing is sized and oriented so as to interact with the portion of the housing that defines the stabilizer opening to thereby prevent the portion of the stabilizer strap from being pulled through the stabilizer opening toward the interior of the housing during deployment of the inflatable airbag cushion.

7. The airbag assembly of claim 6, wherein the stabilizer strap comprises a fabric material, and wherein said portion of the stabilizer strap that is positioned at an exterior of the housing comprises a multi-layered section of the fabric material.

8. The airbag assembly of claim 4, wherein at least a portion of the stabilizer opening defines a T-shaped slot having an insertion section that extends substantially perpendicularly to a retention section.

9. The airbag assembly of claim 8, wherein the retention section of the T-shaped slot is one of collinear with and parallel to the longitudinal axis of the housing so as to be generally perpendicular to a deployment direction of the inflatable airbag cushion.

10. The airbag assembly of claim 8, wherein the stabilizer strap comprises a wider portion and a thinner portion, wherein the wider portion of the stabilizer strap is sized to be inserted through the insertion section of the T-shaped slot, and wherein a thickness of the wider portion of the stabilizer strap is greater than a width of the retention section of the T-shaped slot.

11. The airbag assembly of claim 4, wherein a portion of the stabilizer strap is attached to a catch at an exterior of the housing.

12. The airbag assembly of claim 4, wherein at least a portion of the stabilizer opening is aligned with mounting hardware that secures the inflator to the housing along a line that is one of collinear with and parallel to the longitudinal axis of the housing.

13. The airbag assembly of claim 1, wherein the inflator is coupled to the housing at a position that is closer to the second end of the housing than it is to the first end of the housing.

14. The airbag assembly of claim 1, wherein the housing further comprises an additional mounting component that is closer to the second end of the housing than it is to the first end, and wherein the airbag assembly further comprises an additional stabilizer strap coupled to a portion of the inflatable airbag cushion and coupled to the additional mounting component of the housing, wherein an entirety of the additional stabilizer strap is closer to the second end of the housing than it is to the first end, and wherein the additional stabilizer strap is configured to prevent the portion of the inflatable airbag cushion that is coupled to the additional stabilizer strap from rotating about the position at which the inflator is coupled to the housing so as to inhibit skewing of the inflatable airbag cushion during deployment thereof.

15. The airbag assembly of claim 14, wherein one of the mounting components and the stabilizer strap that is coupled therewith are longitudinally spaced from a first lateral end of the inflator in a first direction, and wherein the other mounting component and the stabilizer strap that is coupled therewith are longitudinally spaced from a second lateral end of the inflator in a second direction that is opposite of the first direction.

16. An airbag assembly comprising:

a housing elongated in longitudinal direction such that a longitudinal axis of the housing extends between a first end and a second end of the housing, the housing defining a deployment opening and a stabilizer opening that are spaced from each other, wherein the stabilizer opening is closer to the first end of the housing than it is to the second end;

an inflator coupled to the housing at a position that is closer to the second end of the housing than is the stabilizer opening;

an inflatable airbag cushion that is coupled to the housing via the inflator such that a portion of the airbag is held between the housing and the inflator; and

a stabilizer strap that is coupled to a portion of the inflatable airbag cushion and extends through the stabilizer opening of the housing to an exterior of the housing,

wherein a portion of the stabilizer strap is configured to interact with a portion of the housing so as to retain the portion of the stabilizer strap at the exterior of the housing during deployment of the inflatable airbag cushion, and

wherein the stabilizer strap is configured to prevent the portion of the inflatable airbag cushion that is coupled to the stabilizer strap from rotating about the position at which the inflator is coupled to the housing so as to inhibit skewing of the inflatable airbag cushion during deployment thereof, and

wherein the portion of the stabilizer strap at an exterior of the housing is sized and oriented so as to interact with the portion of the housing that defines the stabilizer opening to thereby prevent the portion of the stabilizer strap from being pulled through the stabilizer opening toward an interior of the housing during deployment of the inflatable airbag cushion.

17. The airbag assembly of claim 16, wherein the deployment opening of the housing is elongated in the longitudinal direction.

18. The airbag assembly of claim 16, wherein the housing defines a catch at an exterior thereof, and wherein the portion of the stabilizer strap encompasses the catch so as to be maintained at the exterior of the housing.

19. The airbag assembly of claim 18, wherein the catch is closer to the first end of the housing than it is to the second end.

20. The airbag assembly of claim 16, wherein the stabilizer opening defines an insertion section that is joined to a retention section, wherein the stabilizer strap comprises a retaining portion that extends transversely from a threading portion, wherein the retaining portion of the stabilizer strap is thinner than the insertion section of the stabilizer opening and thicker than the retaining section of the stabilizer opening, and wherein the retaining portion of the stabilizer strap is configured to interact with the portion of the housing that defines the retention section of the stabilizer opening so as to be retained at the exterior of the housing during deployment of the inflatable airbag cushion.

21. The airbag assembly of claim 20, wherein a perimeter of the stabilizer opening defines a profile that is complementary to and slightly larger than a profile defined by the retaining and threading portions of the stabilizer strap, such that the retaining and threading portions of the stabilizer strap can be pushed through the insertion and retention sections of the stabilizer opening, respectively, when said portions and sections are properly aligned.

22. The airbag assembly of claim 20, wherein the threading portion of the stabilizer strap is either thinner than or approximately the same thickness as the retention section of the stabilizer opening.

23. The airbag assembly of claim 16, wherein the inflator is coupled to the housing at a position that is closer to the second end of the housing than it is to the first end of the housing.

24. The airbag assembly of claim 16, wherein the housing further defines an additional stabilizer opening that is closer to the second end of the housing than it is to the first end, and wherein the airbag assembly further comprises an additional stabilizer strap that is coupled to a portion of the inflatable airbag cushion and extends through the additional stabilizer opening of the housing to an exterior of the housing, wherein a portion of the additional stabilizer strap is configured to interact with a portion of the housing so as to retain the portion of the additional stabilizer strap at the exterior of the housing during deployment of the inflatable airbag cushion, and wherein the additional stabilizer strap is configured to prevent the portion of the inflatable airbag cushion that is coupled to the additional stabilizer strap from rotating about the position at which the inflator is coupled to the housing so as to inhibit skewing of the inflatable airbag cushion during deployment thereof.

25. The airbag assembly of claim 24, wherein one of the stabilizer openings and the stabilizer strap that extends through it are longitudinally spaced from a first lateral end of the inflator in a first direction, and wherein the other stabilizer opening and the stabilizer strap that extends through it are longitudinally spaced from a second lateral end of the inflator in a second direction that is opposite of the first direction.

26. The airbag assembly of claim 16, wherein the deployment opening and the stabilizer opening are at opposite sides of the housing.

27. A method of assembling an airbag assembly, the method comprising:

providing a housing that is elongated in a longitudinal direction and that defines a stabilizer opening spaced from a deployment opening through which an inflatable airbag cushion can be deployed;

providing an inflatable airbag cushion that comprises a stabilizer strap coupled therewith and an aperture for receiving a portion of an inflator;

inserting a portion of an inflator through the aperture of the inflatable airbag cushion;

coupling the inflator to the housing so as to thereby attach the airbag to the housing; and

advancing a portion of the stabilizer strap from an interior of the housing, through the stabilizer opening of the housing, and to an exterior of the housing such that the portion of the stabilizer strap can be retained at an exterior of the housing during deployment of the inflatable airbag cushion,

wherein the stabilizer opening comprises a T-shaped portion that includes an insertion section and a retention section, wherein the portion of the stabilizer strap is thinner than the insertion section of the stabilizer opening and is thicker than the retention section of the stabilizer opening, and wherein the portion of the stabilizer strap is advanced through the insertion section of the stabilizer opening.

28. The method of claim 27, further comprising moving the portion of the stabilizer strap away from the insertion section of the stabilizer opening to a position within the retention section of the stabilizer opening.