Inflatable airbag assemblies with heat shields

• US 8,408,582 B2
• Filed: 06/23/2010
• Issued: 04/02/2013
• Est. Priority Date: 06/23/2010
• Status: Active Grant

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Lunt, Larry F., Mueller, Louis A., Enders, Mark I., Hatfield, Mark S.
• Primary Examiner(s): Dickson, Paul N
• Assistant Examiner(s): GOODEN JR, BARRY J
• Application Number:
  US12/821,899
• Publication Number:
  US 20110316263A1
• Time in Patent Office: 1,014 Days
• Field of Search: 280/728.2, 280/742
• US Class Current: 280/728.2
• CPC Class Codes: B60R 2021/23123 Heat protection panels
• CPC Class Codes: B60R 2021/2612 Gas guiding means, e.g. ducts
• CPC Class Codes: B60R 21/217 Inflation fluid source retainers, e.g. reaction canisters; Connection of bags, covers, diffusers or inflation fluid sources therewith or together
• CPC Class Codes: B60R 21/231 characterised by their shape, construction or spatial configuration
• CPC Class Codes: B60R 21/235 characterised by their material
• CPC Class Codes: B60R 21/261 with means other than bag structure to diffuse or guide inflation fluid

Abstract

Heat shields are used to shield an airbag from hot gasses issuing from an inflator. The heat shields can be a piece of thin metal that is coupled to the airbag cushion or the inflator. The heat shield can be held in place by being attached or coupled to the airbag and/or the inflator.

Claims

1. An inflatable airbag assembly comprising:

an inflatable airbag;

an inflator coupled to the inflatable airbag, wherein the inflator comprises a tubular body with a gas-emitting end and an opposing connecting end,

wherein the inflator comprises a first mounting stem and a second mounting stem,

wherein the first mounting stem is located at the gas-emitting end that projects away from a long axis of the tubular body

wherein the second mounting stem is located at the connecting end that projects away from the long axis of the tubular body; and

,

a metal heat shield coupled to the inflatable airbag such that an aperture in the inflatable airbag at least partially aligns with an aperture in the heat shield,

wherein the inflator mounting stem protrudes through the aperture in the heat shield and the aperture in the inflatable airbag,

wherein the heat shield is at least partially located between the gas-emitting end of the inflator and the inflatable airbag,

wherein the heat shield is restricted to the gas-emitting end of the inflator, such that the heat shield does not extend to the second mounting stem and does not extend along an entire length of the long axis of the inflator, and

wherein the heat shield has a length and thickness that permit the heat shield to be manipulated, without the use of a powered machine or powered tool, from a planar configuration to being at least partially wrapped around the gas-emitting end of the inflator such that the heat shield is coupled to the gas-emitting end of the inflator.

2. The inflatable airbag assembly of claim 1, wherein the heat shield comprises steel.

3. The inflatable airbag assembly of claim 1, wherein the heat shield comprises a “

U”

shape when at least partially wrapped around the gas-emitting end of the inflator.

4. The inflatable airbag assembly of claim 1, wherein the heat shield comprises a “

C”

shape when at least partially wrapped around the gas-emitting end of the inflator.

5. The inflatable airbag assembly of claim 1, wherein the heat shield is coupled to the inflator before the inflator is coupled to the inflatable airbag.

6. The inflatable airbag assembly of claim 1 wherein the heat shield comprises a plurality of ribs.

7. An inflatable airbag assembly comprising:

an inflatable airbag;

an inflator coupled to the inflatable airbag, wherein the inflator comprises a tubular body with a gas-emitting end and an opposing connecting end, and wherein the inflator also comprises a mounting stem located at the gas-emitting end that projects away from a long axis of the tubular body; and

,

a metal heat shield coupled to the inflatable airbag such that an aperture in the inflatable airbag at least partially aligns with an aperture in the heat shield,

wherein the heat shield is sewn to the inflatable airbag such that a stitching protrudes through the heat shield,

wherein the inflator mounting stem protrudes through the aperture in the heat shield and the aperture in the inflatable airbag,

wherein the heat shield is at least partially located between the gas-emitting end of the inflator and the inflatable airbag, and

wherein the heat shield is restricted to the gas-emitting end of the inflator, such that the heat shield does not extend along an entire length of the long axis of the inflator.

8. The inflatable airbag assembly of claim 7, wherein the heat shield comprises a “

U”

shape.

9. The inflatable airbag assembly of claim 7, wherein the heat shield comprises a “

C”

shape.

10. The inflatable airbag assembly of claim 7, wherein the heat shield comprises a plurality of ribs.

11. The inflatable airbag assembly of claim 7, wherein a thickness of the metal heat shield is between 0.003 inches and 0.20 inches.

12. The inflatable airbag assembly of claim 11, wherein the airbag comprises an inflatable knee airbag.

13. The inflatable airbag assembly of claim 11, wherein the airbag comprises an inflatable side airbag.

14. The inflatable airbag assembly of claim 11, wherein the airbag comprises an inflatable driver'"'"'s side airbag.

15. The inflatable airbag assembly of claim 11, wherein the airbag comprises an inflatable front airbag.

16. The inflatable airbag assembly of claim 11, wherein the airbag comprises an inflatable curtain airbag.

17. The inflatable airbag assembly of claim 11, wherein the heat shield comprises steel.

18. An inflatable airbag assembly comprising:

an inflatable airbag;

an inflator coupled to the inflatable airbag, wherein the inflator comprises a tubular body with a gas-emitting end and an opposing connecting end, and wherein the inflator also comprises a mounting stem located at the gas-emitting end that projects away from a long axis of the tubular body; and

,

a metal heat shield comprising a plurality of ribs,

wherein the heat shield is coupled to the inflatable airbag such that an aperture in the inflatable airbag at least partially aligns with an aperture on the heat shield,

wherein the inflator mounting stem protrudes through the aperture in the heat shield and the aperture in the inflatable airbag,

wherein the heat shield is at least partially located between the gas-emitting end of the inflator and the inflatable airbag, and

wherein the heat shield is restricted to the gas-emitting end of the inflator, such that the heat shield does not extend along an entire length of the long axis of the inflator.

19. The inflatable airbag assembly of claim 18, wherein the heat shield comprises a “

U”

shape.

20. The inflatable airbag assembly of claim 18, wherein the heat shield comprises a “

C”

shape.

21. The inflatable airbag assembly of claim 18, wherein the gas-emitting end of the inflator and the heat shield are located within an inflatable void of the inflatable airbag, and the connecting end of the inflator is located outside the inflatable void.

22. An inflatable airbag assembly comprising:

an inflatable airbag having an aperture;

a metal heat shield coupled to the inflatable airbag via a fabric cover, wherein the cover is sewn around a perimeter of the cover and the heat shield is located within a perimeter of the cover, and

wherein the heat shield and the cover each have an aperture, and wherein the apertures of the inflatable airbag, the heat shield, and the cover each are at least partially aligned; and

,

an inflator coupled to the inflatable airbag, wherein the inflator comprises a tubular body with a gas-emitting end and an opposing connecting end,

wherein the inflator also comprises a mounting stem located at the gas-emitting end that projects away from a long axis of the tubular body,

wherein the inflator mounting stem protrudes through the apertures in the cover, the heat shield and the inflatable airbag,

wherein the heat shield is at least partially located between the gas-emitting end of the inflator and the inflatable airbag, and

wherein the heat shield is restricted to the gas-emitting end of the inflator, such that the heat shield does not extend along an entire length of the long axis of the inflator.

23. The inflatable airbag assembly of claim 22, wherein the cover is sewn to the inflatable airbag such that a stitching protrudes through the heat shield.

24. The inflatable airbag assembly of claim 22, wherein the heat shield comprises a plurality of ribs.

25. The inflatable airbag assembly of claim 22, wherein the gas-emitting end of the inflator and the heat shield are located within an inflatable void of the inflatable airbag, and the connecting end of the inflator is located outside the inflatable void.

26. The inflatable airbag assembly of claim 22, wherein the heat shield comprises a “

U”

shape when coupled to the gas-emitting end of the inflator.

27. The inflatable airbag assembly of claim 22, wherein the heat shield comprises a “

C”

shape when coupled to the gas-emitting end of the inflator.

28. The inflatable airbag assembly of claim 22, wherein prior to inflatable airbag assembly, the cover and the heat shield are coupled together and comprise a sub assembly.

29. The inflatable airbag assembly of claim 28, wherein the cover comprises a plurality of cut-outs such that an equal number of corners of the heat shield can be placed into the cutouts, thereby retaining the heat shield on the cover.

30. The inflatable airbag assembly of claim 28, wherein the cover and the heat shield are coupled together via stitching, which protrudes through the cover and the heat shield.