Inflatable airbag assembly with an airbag housing vent panel

• US 8,191,926 B2
• Filed: 07/26/2010
• Issued: 06/05/2012
• Est. Priority Date: 07/26/2010
• Status: Expired due to Fees

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Schneider, David W.
• Primary Examiner(s): Fleming, Faye M.
• Application Number:
  US12/843,708
• Publication Number:
  US 20120018990A1
• Time in Patent Office: 680 Days
• Field of Search: 280/736, 280/739, 280/740, 280/741, 280/742
• US Class Current: 280/739
• CPC Class Codes: B60R 2021/2395 comprising means to control the venting
• CPC Class Codes: B60R 21/239 characterised by their venting means
• CPC Class Codes: B60R 21/276 with means to vent the inflation fluid source, e.g. in case of overpressure B60R21/30 takes precedence; venting means on inflatable member walls B60R21/239

Abstract

Vents in inflatable airbags can be used to soften airbags during deployment by allowing inflation gas to exit from the interior of the airbag. Airbag vents can be used in conjunction with vents in an airbag housing and a vent panel that can align with airbag vent with the housing vent and cover the aperture of the housing vent.

Claims

1. An inflatable airbag assembly, comprising:

an airbag housing having a vent aperture; and

an inflatable airbag coupled to the airbag housing, wherein the inflatable airbag has a vent aperture that is at least partially aligned with the vent aperture in the airbag housing; and

,

an inflator in fluid communication with the inflatable airbag, wherein the inflator is configured to be activated by a vehicle sensor; and

,

a vent panel coupled to the airbag at a first location on an upper portion of the vent panel, wherein in a packaged configuration, the vent panel covers the vent aperture in the inflatable airbag, and wherein the vent panel is located between the inflatable airbag vent aperture and the housing vent aperture, and

wherein during initial inflatable airbag deployment, inflation gas causes at least a portion of the vent panel to be pushed away from the inflatable airbag vent aperture such that the vent panel is pushed partially through the vent aperture in the airbag housing to enable inflation gas to exit the inflatable airbag assembly via the vent apertures in the inflatable airbag and the housing, and

wherein during inflatable airbag deployment with obstruction, the vent panel continues to be pushed away from the inflatable airbag vent aperture and partially through the vent aperture in the airbag housing, such that inflation gas continues to exit the inflatable airbag assembly via the apertures in the inflatable airbag and the housing, and

wherein during inflatable airbag deployment without obstruction, the vent panel is pulled back through the housing vent aperture and pressed against a portion of the housing such that an amount inflation gas exiting the inflatable airbag assembly is reduced.

2. The inflatable airbag assembly of claim 1, wherein the assembly further comprises a diffuser that is coupled to the airbag housing and located within an inflatable void of the inflatable airbag, wherein the diffuser directs inflation gas from the inflator toward the airbag housing vent aperture.

3. The inflatable airbag assembly of claim 1, wherein the vent panel is configured to retain the inflatable airbag vent aperture in at least partial alignment with the housing vent aperture.

4. The inflatable airbag assembly of claim 1, wherein when the assembly is in a packaged configuration, the vent panel blocks debris from entering the inflatable airbag via the airbag vent aperture.

5. The inflatable airbag assembly of claim 1, wherein the vent panel further comprises a rupture point that is configured to rupture when the inflator is activated during inflatable airbag deployment.

6. The inflatable airbag assembly of claim 1, wherein during inflatable airbag deployment, the vent panel is retained on the inflatable airbag.

7. The inflatable airbag assembly of claim 1, wherein the vent panel is coupled to the airbag at a second location.

8. The inflatable airbag assembly of claim 7, wherein the vent panel is coupled to the airbag at the second location via tear stitching.

9. The inflatable airbag assembly of claim 7, wherein the vent panel is coupled to the airbag at a third location.

10. An inflatable airbag assembly, comprising:

an airbag housing having a vent aperture; and

an inflatable airbag coupled to the airbag housing, wherein the inflatable airbag has a vent aperture that is at least partially aligned with the vent aperture in the airbag housing; and

,

an inflator in fluid communication with the inflatable airbag, wherein the inflator is configured to be activated by a vehicle sensor; and

,

a vent panel coupled to the airbag at a first location on an upper portion of the vent panel, wherein in a packaged configuration, the vent panel covers the vent aperture in the inflatable airbag, and wherein the vent panel is located between the inflatable airbag vent aperture and the housing vent aperture, and

wherein the vent panel comprises a plurality of extensions that extend away from the upper portion of the vent panel and are coupled to the housing such that the vent panel retains the airbag vent aperture in alignment with the housing vent aperture, and

wherein during initial inflatable airbag deployment, inflation gas causes a second portion of vent panel, that is opposite the upper portion, to be pushed away from the inflatable airbag vent aperture such that the vent panel is pushed partially through the vent aperture in the airbag housing to permit inflation gas to exit the inflatable airbag assembly via the vent apertures in the inflatable airbag and the housing, and

wherein during inflatable airbag deployment with obstruction, the vent panel continues to be pushed away from the inflatable airbag vent aperture and partially through the vent aperture in the airbag housing, such that inflation gas continues to exit the inflatable airbag assembly via the apertures in the inflatable airbag and the housing, and

wherein during inflatable airbag deployment without obstruction, the vent panel is pulled back through the housing vent aperture pressed against a portion of the housing such that an amount inflation gas exiting the inflatable airbag assembly is reduced.

11. The inflatable airbag assembly of claim 10, wherein the assembly further comprises a diffuser that is coupled to the airbag housing and located within an inflatable void of the inflatable airbag, wherein the diffuser directs inflation gas from the inflator toward the airbag housing vent aperture.

12. The inflatable airbag assembly of claim 10, wherein the vent panel substantially comprises a “

T”

shape.

13. The inflatable airbag assembly of claim 10, wherein the vent panel substantially comprises a “

Y”

shape.

14. The inflatable airbag assembly of claim 10, wherein each of the extensions of the vent panel comprise an aperture.

15. The inflatable airbag assembly of claim 14, wherein the housing comprises a plurality of extensions that extend away from a rim of the housing and receive one of the apertures of the vent panel extensions.

16. The inflatable airbag assembly of claim 10, the second portion comprises a bottom portion of the vent panel.

17. The inflatable airbag assembly of claim 16, wherein the bottom portion of the vent panel is coupled to the inflatable airbag via tear stitching that is configured to rupture during initial inflatable airbag deployment.

18. The inflatable airbag assembly of claim 10, wherein the second portion comprises a first side portion.

19. The inflatable airbag assembly of claim 18, wherein the vent panel is also coupled to the inflatable airbag at a third portion.

20. The inflatable airbag assembly of claim 19, wherein the third portion comprises a second side portion that is opposite the first side portion.

21. The inflatable airbag assembly of claim 20, wherein the vent panel is sewn to the inflatable airbag at the upper portion and each of the first and second side portions, such that the vent panel is attached to the inflatable airbag at three rows of stitches.

22. The inflatable airbag assembly of claim 21, wherein the vent panel comprises a first set of perforations and a second set of perforations, and wherein each of the sets of perforations are located on an inward side of the rows of stitches on the first and second side portions of the vent panel, and

wherein upon initial inflatable airbag deployment, both the first and second sets of perforations rupture such that a middle portion and a bottom portion of the vent panel is pushed through the housing vent aperture.

23. An inflatable airbag assembly, comprising:

an airbag housing having a vent aperture; and

,

an inflatable airbag coupled to the airbag housing, wherein the inflatable airbag comprises a folded throat portion and a vent aperture, and

wherein the throat portion is retained in a folded configuration via tear stitching, and

wherein upon inflatable airbag deployment with obstruction, the tear stitching does not rupture and inflation gas can exit the inflatable airbag assembly via the vent apertures in the inflatable airbag and the housing, and

wherein upon inflatable airbag deployment without obstruction, the tear stitching ruptures and the vent aperture of the inflatable airbag and the vent aperture of the housing become misaligned.

24. The inflatable airbag assembly of claim 23, wherein the fold comprises a tuck.

25. The inflatable airbag assembly of claim 24, wherein the throat portion has been tucked such that a top portion of the tuck at least partially blocks the vent aperture.

26. The inflatable airbag assembly of claim 25, wherein the inflatable airbag assembly further comprises a vent panel that is coupled to the inflatable airbag at the tucked throat portion, such that in a packaged configuration, the vent aperture in the airbag is blocked by the vent panel.

27. The inflatable airbag assembly of claim 26, wherein during initial inflatable airbag deployment, inflation gas causes a portion of vent panel to be pushed away from the inflatable airbag vent aperture such that the vent panel is pushed partially through the vent aperture in the airbag housing to enable inflation gas to exit the inflatable airbag assembly via the vent apertures in the inflatable airbag and the housing.

28. The inflatable airbag assembly of claim 23, wherein during inflatable airbag deployment without obstruction, the portion of the vent panel that was pushed through the vent aperture is pulled back through the housing vent aperture and is pressed against a portion of the housing such that an amount of inflation gas exiting the inflatable airbag assembly via the airbag vent aperture is reduced.