Cushion and housing vents for inflatable cushion airbags

• US 7,770,922 B2
• Filed: 09/04/2008
• Issued: 08/10/2010
• Est. Priority Date: 09/04/2008
• Status: Active Grant

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Choi, ChangSoo, Schneider, David W.
• Primary Examiner(s): Fleming; Faye M.
• Application Number:
  US12/204,626
• Publication Number:
  US 20100052298A1
• Time in Patent Office: 705 Days
• Field of Search: 280/739, 280/740, 280/743.1, 280/736
• US Class Current: 280/739
• CPC Class Codes: B60R 2021/23388 having ends which are movable or detachable during deployment
• CPC Class Codes: B60R 2021/2765 comprising means to control the venting
• CPC Class Codes: B60R 21/2338 Tethers
• CPC Class Codes: B60R 21/239 characterised by their venting means

Abstract

An airbag assembly comprising a housing with an inflatable airbag cushion disposed therein and at least one vent aperture attached to the inflatable airbag cushion, wherein during inflatable airbag cushion deployment with an obstruction, the at least one vent aperture remains open, and during inflatable airbag cushion deployment without an obstruction, the at least one vent aperture at least partially closes.

Claims

1. An airbag assembly, comprising:

an airbag assembly housing having first housing aperture and a second housing aperture;

an inflatable airbag cushion disposed inside the airbag assembly housing;

wherein the inflatable airbag cushion comprises a cushion membrane having a first vent aperture and a second vent aperture, wherein the first vent aperture and the second vent aperture are located opposite each other in opposing sides of the airbag cushion, and

wherein the inflatable airbag cushion further comprises two tabs that are each respectively coupled near a perimeter of each vent aperture, each tab protruding through the housing aperture adjacent to the respective vent aperture, and each tab is coupled to a side wall of the housing,

wherein the first vent aperture is initially aligned with the first housing aperture and the second vent aperture is initially aligned with the second housing aperture such that during inflatable airbag cushion deployment with obstruction, the first vent aperture remains at least partially aligned with the first housing aperture and the second vent aperture remains at least partially aligned with the second housing aperture, thereby allowing inflation gas to exit the airbag cushion via vent and apertures, and

wherein during inflatable airbag cushion deployment without obstruction, the vent apertures move as the inflatable airbag cushion expands such that the vent apertures become misaligned with respect to the housing apertures, whereby inflation gas directed toward the housing apertures is blocked from exiting through the housing apertures by the cushion membrane and the inflatable airbag cushion fully expands.

2. The airbag assembly of claim 1, further comprising a diffuser configured to receive inflation gas from an inflator and to re-direct inflation gas from the inflator in the direction of the first housing aperture and the second housing aperture of the airbag assembly housing.

3. The airbag assembly of claim 2, wherein a portion of the diffuser is attached to the inflatable airbag cushion.

4. The airbag assembly of claim 1, wherein each tab is coupled to the inflatable airbag cushion via tear stitching, wherein the tear stitching is configured to rupture if the airbag cushion fully deploys without encountering an obstruction such that the first and second vent apertures may become misaligned respectively with the first and second housing apertures.

5. The airbag assembly of claim 1, wherein each tab comprises a slot that is configured to receive an extension that is coupled to the sidewall of the housing.

6. The airbag assembly of claim 5, wherein each tab further comprises at least one aperture in addition to the slot, wherein the additional aperture is configured to allow a worker to pull each tab through one of the housing apertures.

7. The airbag assembly of claim 1, wherein each tab comprises a tear point.

8. The airbag assembly of claim 7, wherein the tear point in each tab comprises perforations in the tab.

9. The airbag assembly of claim 7, wherein the tear point in each tab comprises a reduction in the cross sectional area of the tab.

10. An airbag assembly, comprising:

an airbag assembly housing having at least one aperture; and

an inflatable airbag cushion in a packaged configuration and located inside the airbag assembly housing, wherein the cushion comprises at least one vent aperture that is retained in at least partial alignment with the housing aperture via at least one tab,

wherein during inflatable airbag cushion deployment with obstruction, the at least one tab continues to retain the housing and vent apertures in at least partial alignment, thereby allowing inflation gas to exit the airbag cushion via the vent and housing apertures, and

wherein during inflatable airbag cushion deployment without obstruction, the at least one tab ceases to retain the vent and housing apertures in at least partial alignment such that the housing and vent apertures may become at least partially misaligned.

11. The airbag assembly of claim 10, wherein the tab is coupled to the inflatable airbag cushion near a perimeter of the at least one vent aperture, and wherein the tab protrudes through the at least one housing aperture and is coupled to a side wall of the housing.

12. The airbag assembly of claim 11, wherein the tab is coupled to the inflatable airbag cushion via tear stitching, wherein the tear stitching is configured to rupture if the airbag cushion fully deploys without encountering an obstruction such that the vent aperture may become misaligned with the housing aperture.

13. The airbag assembly of claim 11, wherein the tab comprises a slot that is configured to receive an extension that is coupled to the sidewall of the housing.

14. The airbag assembly of claim 13, wherein the tab further comprises at least one aperture in addition to the slot, wherein the additional aperture is configured to allow a worker to pull the tab through the aperture in the housing.

15. The airbag assembly of claim 10, wherein the tab comprises a tear point.

16. The airbag assembly of claim 15, wherein the tear point comprises perforations in the tab.

17. The airbag assembly of claim 15, wherein the tear point comprises a reduction in the cross sectional area of the tab.

18. The airbag assembly of claim 10, wherein the volume of inflation gas that is vented through the at least one vent aperture is reduced by the complete deployment of the inflatable airbag without obstruction, wherein during the complete deployment of the inflatable airbag the tension in the inflatable airbag cushion pulls the at least one vent aperture out of alignment with the at least one housing aperture.

19. An airbag assembly, comprising:

an airbag assembly housing comprising a first housing aperture and a second housing aperture;

an inflatable airbag cushion disposed within the airbag assembly housing;

wherein the inflatable airbag cushion comprises a cushion membrane having a first vent aperture and a second vent aperture, wherein the first vent aperture and the second vent aperture are located opposite each other in opposing sides of the inflatable airbag cushion, wherein when the cushion is in a packaged configuration, the first vent aperture is aligned with the first housing aperture and the second vent aperture is aligned with the second housing aperture; and

a diffuser disposed within the inflatable airbag cushion and configured to receive inflation gas from an inflator and to re-direct inflation gas from the inflator in the direction of the first housing aperture and the second housing aperture of the airbag assembly housing such that the gas exits the inflatable airbag cushion via the at least one vent aperture when deployment of the airbag is obstructed;

wherein, during initial deployment of the inflatable airbag cushion, the first vent aperture is aligned with the first housing aperture and the second vent aperture is aligned with the second housing aperture, and during deployment of the inflatable airbag cushion with obstruction, the first vent aperture remains at least partially aligned with the first housing aperture and the second vent aperture remains at least partially aligned with the second housing aperture, thereby allowing inflation gas to be directed from the diffuser toward the housing apertures and exit out of the housing apertures via the vent apertures; and

wherein during inflatable airbag cushion deployment without obstruction, the vent apertures move as the inflatable airbag cushion expands such that the vent apertures become at least partially misaligned with respect to the housing apertures and the diffuser, whereby inflation gas directed from the diffuser toward the housing apertures is blocked from exiting through the housing apertures by the cushion membrane and the inflatable airbag cushion fully expands.

20. The airbag assembly of claim 19, wherein the inflatable airbag cushion further comprises two tabs that are each respectively coupled to the cushion membrane, extend through one of the housing apertures, and are each coupled to the housing such that each of the vent apertures cannot be moved relative to the adjacent housing aperture upon initial deployment of the inflatable airbag cushion.

21. The airbag assembly of claim 20, wherein each tab is coupled to the inflatable airbag cushion via tear stitching, wherein the tear stitching is configured to rupture if the airbag cushion fully deploys without encountering an obstruction such that the first and second vent apertures may become misaligned respectively with the first and second housing apertures.

22. The airbag assembly of claim 20, wherein each tab comprises a slot that is configured to receive an extension that is coupled to the sidewall of the housing.

23. The airbag assembly of claim 20, wherein each tab comprises a tear point.

24. The airbag assembly of claim 23, wherein the tear point in each tab comprises perforations in the tab.

25. The airbag assembly of claim 24, wherein the tear point in each tab comprises a reduction in the cross sectional area of the tab.

26. The airbag assembly of claim 19, wherein a portion of the diffuser is attached to the inflatable airbag cushion.

27. The airbag assembly of claim 19, wherein the first and second vent apertures are not attached respectively with the first and second housing apertures.