Air bag module

• US 5,121,941 A
• Filed: 02/19/1991
• Issued: 06/16/1992
• Est. Priority Date: 02/19/1991
• Status: Expired due to Fees

• Current Assignee: TRW Vehicle Safety Systems Incorporated (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: TRW Vehicle Safety Systems Incorporated (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Hoskins, Steven R., Jarboe, Patrick G., Hocking, James R., Mihm, Joseph J.
• Primary Examiner(s): Rice, Kenneth R.
• Application Number:
  US07/657,423
• Time in Patent Office: 483 Days
• Field of Search: 280/728, 280/730, 280/731, 280/732, 280/738, 280/743
• US Class Current: 280/732
• 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

Abstract

A new and useful vehicle air bag module design and new assembly techniques are designed specifically for automating the process of assembling an air bag module. The air bag module includes a reaction can which has a main body defining a cavity and an air bag opening, an external flange extending away from the air bag opening, and an inflator-receiving slot formed in part of the main body. A folded air bag having a gas inlet opening is at least partially disposed in the cavity. A retention device is integral with the air bag around the periphery of the gas inlet opening and is disposed adjacent the external flange on the reaction can. The inflator has a cylindrical housing and an integral coupling structure. The cylindrical housing extends partially through the inflator-receiving slot and includes a portion disposed within said cavity and a portion disposed outside said cavity. A first set of fasteners connects the coupling structure of the inflator with a portion of said main body of said reaction can. A second set of fasteners connects the retention device with the external flange on the reaction can. The reaction can, which may be either aluminum or steel, is formed as a monolithic structure by deep drawing techniques.

Claims

1. A vehicle air bag module comprising:

a reaction can including a main body defining a cavity and an air bag opening, an external flange extending away from said air bag opening, and an inflator-receiving slot formed in part of said main body;

a folded air bag having a gas inlet opening and being at least partially disposed in said cavity;

a retention device integral with said air bag around the periphery of said gas inlet opening and disposed adjacent said external flange on said reaction can;

an inflator comprising a cylindrical housing and a coupling structure integral with the housing, said cylindrical housing extending partially through said inflator-receiving slot and including a portion disposed within said cavity and a portion disposed outside said cavity, gas dispensing nozzles being formed in said portion of said cylindrical housing disposed within said cavity;

a first set of fasteners connecting said coupling structure of said inflator with a portion of said main body of said reaction can; and

a second set of fasteners connecting said retention device with said external flange on said reaction can.

2. A vehicle air bag module as set forth in claim 1 further comprising a cover, said cover including a portion designed to overlie said external flange on said reaction can, said second set of fasteners connecting said cover to said external flange on said reaction can.

3. A vehicle air bag module as set forth in claim 2 wherein each of the fasteners in said second set of fasteners has opposite ends, said opposite ends being disposed external to said air bag, said cover, and said reaction can, whereby said opposite ends of each of said second set of fasteners may be inspected from outside of said vehicle air bag module.

4. A vehicle air bag module as set forth in claim 1 wherein said external flange has outer surface portions against which said retention device is disposed, said outer surface portions being co-planar relative to each other.

5. A vehicle air bag module as set forth in claim 1 wherein said external flange extends completely around said air bag opening.

6. A vehicle air bag module as set forth in claim 1 wherein said portion of said cylindrical inflator housing disposed within said air bag cavity occupies a predetermined portion of the volume space in said air bag cavity and said folded air bag fills substantially all remaining portions of the volume space in said air bag cavity.

7. A vehicle air bag module as set forth in claim 1 wherein said folded air bag occupies an envelope of predetermined geometric proportion and said retention device extends away from said envelope.

8. A vehicle air bag module as set forth in claim 1 wherein all of the fasteners of said first set of fasteners are oriented in a common direction to each other and wherein all of the fasteners of said second set of fasteners are oriented in a common direction to each other.

9. A vehicle air bag module as set forth in claim 8 wherein said main body of said reaction can comprises a wall with an inside surface defining said cavity and an outside surface on the opposite side of said wall from said inside surface, said inflator coupling structure comprising at least one flange integral with said cylindrical housing, said flange being disposed in a predetermined orientation against a portion of said wall, and said first set of fasteners extending through said flange and said portion of said wall to connect said cylindrical inflator housing to said portion of said wall.

10. A vehicle air bag as set forth in claim 9 wherein said flange is disposed against the inside surface of said portion of said wall.

11. A vehicle air bag as set forth in claim 9 wherein said flange is disposed against the outside surface of said portion of said wall.

12. A vehicle air bag as set forth in any of claims 1-11 wherein said reaction can consists essentially of a monolithic structure.

13. A vehicle air bag module comprising:

a reaction can including (a) a main body defining a cavity and an air bag opening and (b) an external flange extending away from said air bag opening, said main body comprising a pair of converging wall sections and having an inflator-receiving slot formed in one of said pair of converging wall sections;

a folded air bag having a gas inlet opening, said folded air bag being attached to said reaction can and disposed at least partially within said cavity;

an inflator comprising a cylindrical housing and a coupling structure integral with the housing, said cylindrical housing extending partially through said slot in said main body and including a portion disposed within said cavity and a portion disposed outside said cavity, gas dispensing nozzles being formed in said portion of said cylindrical housing disposed within said cavity; and

a first set of fasteners connecting said inflator coupling structure with said main body of said reaction can.

14. A vehicle air bag module as defined in claim 13 wherein said converging wall sections are of different dimensions whereby said main body is asymmetrical in shape.

15. A vehicle air bag module as set forth in either of claims 13 or 14 further comprising a retention device integral with said air bag around the periphery of said gas inlet opening and disposed adjacent said external flange on said reaction can;

and a second set of fasteners connecting said retention device with said external flange on said reaction can.

16. A vehicle air bag module as set forth in claim 15 further comprising a cover, said cover including a portion designed to overlie said external flange on said reaction can, said first set of fasteners connecting said cover to said external flange on said reaction can.

17. A vehicle air bag module as set forth in claim 16 wherein each of the fasteners in said second set of fasteners has opposite ends, said opposite ends being disposed external to said air bag, said cover, and said reaction can, whereby said opposite ends of each of said second set of fasteners may be inspected from outside of said vehicle air bag module.

18. A vehicle air bag module as set forth in claim 17 wherein said external flange has outer surface portions against which said retention device is disposed, said outer surface portions being co-planar relative to each other.

19. A vehicle air bag module as set forth in claim 18 wherein said external flange extends completely around said air bag opening.

20. A vehicle air bag module as set forth in claim 19 wherein said portion of said cylindrical inflator housing disposed within said air bag cavity occupies a predetermined portion of the volume space in said air bag cavity and said folded air bag fills substantially all remaining portions of the volume space in said air bag cavity.

21. A vehicle air bag module as set forth in claim 20 wherein said folded air bag occupies an envelope of predetermined geometric proportion and said retention device extends away from said envelope.

22. A vehicle air bag module as set forth in claim 21 wherein all of the fasteners of said first set of fasteners are oriented in a common direction to each other and wherein all of the fasteners of said second set of fasteners are oriented in a common direction to each other.

23. A vehicle air bag module as set forth in claim 22 wherein said main body of said reaction can comprises a wall with an inside surface defining said cavity and an outside surface on the opposite side of said wall from said inside surface, said inflator coupling structure comprising at least one flange integral with said cylindrical housing, said flange being disposed in a predetermined orientation against a portion of said wall, and said first set of fasteners extending through said flange and said portion of said wall to connect said cylindrical inflator housing to said portion of said wall.

24. A vehicle air bag as set forth in claim 23 wherein said flange is disposed against the inside surface of said portion of said wall.

25. A vehicle air bag as set forth in claim 23 wherein said flange is disposed against the outside surface of said portion of said wall.

26. A vehicle air bag as set forth in any of claims 13-25 wherein said reaction can consists essentially of a monolithic structure.

27. A reaction can for a vehicle air bag module, said reaction can comprising:

a monolithic structure defining a cavity and an air bag opening;

said monolithic structure including a main body portion and an external substantially planar flange circumscribing said air bag opening and extending away from said air bag opening;

said main body portion of the monolithic structure extending away from said flange and defining the cavity;

said main body portion having a slot shaped to enable a cylindrical inflator to extend partially through said slot whereby the cylindrical inflator will be disposed partially in said air bag cavity and partially outside said air bag cavity.

28. A reaction can as set forth in claim 27 wherein said monolithic structure is at least partially cold worked.

29. A reaction can as set forth in claim 27 wherein said monolithic structure is made of aluminum.

30. A reaction can as set forth in claim 27 wherein said monolithic structure is made of steel.

31. A reaction can as set forth in claim 27 wherein said main body portion comprises a pair of converging wall sections.

32. A reaction can as set forth in claim 31 wherein said converging wall sections are of different dimensions whereby said main body portion is asymmetrical in shape.

33. A reaction can as set forth in claim 27 wherein said monolithic structure is made of a nonmetallic material.

34. A vehicle air bag module comprising:

a reaction can including a main body defining a cavity and an air bag opening, an external flange extending away from said air bag opening, and an inflator-receiving slot formed in part of said main body;

a folded air bag having a gas inlet opening and being at least partially disposed in said cavity;

a retention device integral with said air bag around the periphery of said gas inlet opening and disposed adjacent said external flange on said reaction can;

an inflator comprising a cylindrical housing and a coupling structure which couples said housing to said reaction can, said cylindrical housing extending partially through said inflator-receiving slot and including a portion disposed within said cavity and a portion disposed outside said cavity, gas dispensing nozzles being formed in said portion of said cylindrical housing disposed within said cavity;

a first set of fasteners connecting said coupling structure of said inflator with a portion of said main body of said reaction can; and

a second set of fasteners connecting said retention device with said external flange on said reaction can.

35. A vehicle air bag module comprising:

a reaction can including (a) a main body defining a cavity and an air bag opening and (b) an external flange extending away from said air bag opening, said main body comprising a pair of converging wall sections and having an inflator-receiving slot formed in one of said pair of converging wall sections;

a folded air bag having a gas inlet opening, said folded air bag being attached to said reaction can and disposed at least partially within said cavity;

an inflator comprising a cylindrical housing an a coupling structure which couples said housing to said reaction can, said cylindrical housing extending partially through said slot in said main body and including a portion disposed within said cavity and a portion disposed outside said cavity, gas dispensing nozzles being formed in said portion of said cylindrical housing disposed within said cavity; and

a first set of fasteners connecting said inflator coupling structure with said main body of said reaction can.